研究紀要 - 奈良工業高等専門学校 · produced. The results of questionnaire show that the all student had enjoyed and almost all students have got interest in metalworking

研究紀要

奈良工業高等専門学校

平成 24 年度

ISSN　0387－1150

8

目　　　次

粉末冶金法によるものづくり体験講座の実施　　 … 谷口　幸典・奥村　光喜・中西　敏文・尾崎　充紀・市瀬　辰己・山野　晃太郎 ………… 1

高圧小容積の衝撃波管を用いた非定常超音速ジェットに関する研究　　 …………… 福岡　寛・屋我　実・滝谷　俊夫・梅津　郁朗 ………… 7

ピコ秒パルスレーザを用いた厚み測定 ……………………………………………………………………………………… 押田　至啓 ………… 13

回転水中紡糸法によるAu-Sn合金細線の開発 ………………………………………………………………… 島岡　三義・和田基 ………… 17

LEDのエージングテスト装置に関する研究　　 …………………………………………………… 櫟　弘明・牧野　孝史・塚本　勝孝 ………… 23

学生による超小型人工衛星プロジェクトのための衛星データ配信・共有システムの開発…………………………………… 浅井　文男 ………… 29

準ストーン代数*のシ－ケントによる形式化 …………………………………………………………………………………… 荒金　憲一 ………… 31

論文抄録 ……………………………………………………………………………………………………………………………………………… 38

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Powder Metallurgy implemented to the Hands-on Education for Introducing Metalworking Technology to Young Students

Yukinori TANIGUCHI, Kouki OKUMURA*, Toshifumi NAKANISHI** Mitsunori OZAKI, Tatsumi ICHISE and Koutaro YAMANO***

In this paper, we propose applying Powder Metallurgy (PM) as a theme of workshop practice which aims to

give young students interest in manufacturing technology or material science. Three technical procedures, (1)

Simplified metal powder forming method, (2) Using silicone for a means of self making mold, (3) Special

sintering method that uses ordinary microwave oven, have been suggested in order to conduct the workshop

practice in the common classroom without any special devices. We have held several workshops for young

students at our school and junior high school. In the workshop, the copper powder with ager binder was casted

into a silicone mold, and was successfully formed to desired shape without compaction pressure. Sintering was

demonstrated in the classroom and it seemed that every student had enjoyed looking how the PM parts are

produced. The results of questionnaire show that the all student had enjoyed and almost all students have got

interest in metalworking technology after proposed workshop. It is concluded that proposed procedures are very

effective as a means to introduce the knowledge of manufacturing technology to young students or kids.

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* ** ***

Study of Unsteady Supersonic Jet using Shock Tube with Small High-Pressure Chamber

Hiroshi FUKUOKA, Minoru YAGA*, Toshio TAKIYA**and Ikurou UMEZU***

The unsteady supersonic jet formed by the shock tube with small high-pressure section was used as a simple

alternative system of pulsed laser ablation. The dynamic of the supersonic jet impinging upon a flat plate are

discussed by comparing experimental and calculated results. The experiment and numerical calculation were

carried out by schlieren method and by solving the axisymmetric two-dimensional compressible Navier-Stokes

equations, respectively. The main parameters are distance between the open end of the shock tube and the flat

plate, L/D, and the pressure ratio of the shock tube, Ph/Pb. Where, L, D, Ph and Pb are the distance between the

open end of the shock tube and the flat plate, the diameter of the shock tube, pressure of the high and low section

of the shock tube, respectively. Collision between the shock wave reflected at the flat plate and the head of

supersonic jet takes place. Computational results well predict the experimental dynamic behavior of the shock

wave and the supersonic jet. Marked increase in the static pressure on the flat plate under high Ph/Pb and short

L/D is observed due to interaction between the shock wave and the unsteady jet flow.

D (mm)L (mm)

Ph (Pa)Pb (Pa)Pw (Pa)

t (s)x (mm)y (mm)

PLA(Pulsed Laser Ablation)1)~4) PLA

5),

6)

Iwata 7)

8)~10)

11),12)

13), 14)

Setoguchi 15)

PLA* ** ***

PLA

PLA

PLA

TVD(Total Variation Diminishing)

L

Needle

Diaphragm

D=10

High-Pressure Section

Low-Pressure Section

10 10

Driven section

Pressure transducer

(Flush mount)

Flat plate(Substrate)

Fig.2 Side view of shock tube and flat plate

Downstream condition

Symmetric condition

Non slip-wall condition

x/D0-1-2

D/2

L/D

y/D5

Diaphragm condition

5

Flat plate (Substrate)

High-Pressure Section

Low-Pressure Section

Fig.3 Flow field for computation and boundary conditions

Amplifier

Semi-ConductorPressure transducer

Trigge r

High SpeedVideo Ca me ra

Knife edge

ADDatCosys

Conve rte ra Sampling

mpute rte m

Halogen Lamp

Air bottle

chambe rHyperbaric

Regulator

Camera

Concave Mirror

Fig.1 Experimental apparatus

2

10mm

L/D2.5 10.0

Ph/Pb=10.7 20.6 36.0 47.425 50 75

100 m

32

10

y/D

543210x/D

32

10

y/D

543210x/D

32

10

y/D

543210x/D

32

10

y/D

543210x/D

(a) t=42.9 s (b) t=70.9 s

(c) t=138 s (d) t=286 s

Shock waveSupersonic Jet

Fig.4 Typical computational schlieren images and schlieren photographs for L/D = 5.0, Ph/Pb= 22.6: above, calculation; below, experiment

TVD MUSCLRoe

3

x/D -1.0

x= y=40/D

4 L/D=5.0 Ph/Pb=22.6

t=04(a)

4(b)

320300280260240220200180160140120100806040200t[

s]

543210x/D

320300280260240220200180160140120100806040200t[

s]

543210x/D

(a) Schlieren photograph (b) Computational schlierenphotograph



Fig.5 Time history of schlieren photographs for L/D=5.0, Ph/Pb = 10.7

Fig.6 Wall static pressure variation for L/D=5.0Ph/Pb = 10.7

2.5

2.0

1.5

1.0

0.5

P w/P

b

600μs500400300200100

t[s]

Experiment Calculation

4(c) L/D =5.0

4(d)

L/D=5.0 Ph/Pb=10.75

5(a)

y/D=-0.14~0.14 t=0~320 m50000fps t=20 s

5(a) t=80 sx/D=3.0 1.8

t=140~180 s

Fig.7 Wall static pressure variation for Ph/Pb =22.6, L/D=2.5, 5.0 and 7.5

3.2

2.8

2.4

2.0

1.6

1.2

0.8

P w/P

b

600x10-6500400300200100

t[s]

L/D=2.5

L/D=5.0

L/D=7.5

Fig.8 Relation between L/D and peak pressure of shock wave

6

5

4

3

2

1

0

P w/P

b

10.09.08.07.06.05.04.03.02.0

L/D

ph/pb=10.7 ph/pb=22.6 ph/pb=36.0 ph/pb=47.4

Experiment Calculation

t=320 s

5 (b)y/D -0.05~0.05 t=6 s

5(b)

t=140 s

t=320 s

Ph/Pb=10.76

6 t=156 s t=323 s

Fig.9 Computational schlieren photographs and pressure distribution along axis for L/D = 2.5, Ph/Pb= 22.6

(a) t=65.1ms (c) t=99.8ms(b) t=82.1ms

y/D

P/P b

x/D x/D x/D2.01.00.02.01.00.0

4

3

2

1

0 2.01.00.03

21

0-1

-2-3

Ph/Pb=22.67

L/D=2.5 5.0 7.57 L/D=2.5 5.0 7.5

t=82.1 138 199 sL/D

L/D=2.5L/D

L/D=2.5L/D=2.5 5.0 7.5

t=146 286 429 s

L/DL/D

L/D

Pw/Pb 8

8

Ph/Pb=10.7 22.6 36.0 47.4L/D

L/D=10.0 Ph/Pb=10.7 22.6 36.0 47.4Ph/Pb

Ph/Pb

L/D 2.5

L/D=4.0

9 L/D=4.0 Ph/Pb=22.6

9(a)x/D=2.2 3.7

9(b)x/D=3.3 4.0 9(c)

x/D=3.5

x/D=3.0 3.5L/D

1

2

Ph/Pb=22.6

3

4 Ph/Pb=10.7 22.6 36.0 47.4L/D 2.5~10

L/D 2.5

5 L/D 4.0

(1) Gacek S., and Wang X., “Secondary shock wave in laser-material interaction,” Journal of Applied Physics, 104(12), p. 126101, 2008.

(2) Fukuoka H., Yaga M., and Takiya T., “Study of Interaction between Unsteady Supersonic Jet and Shock Waves in Elliptical Cell,” Journal of Fluid Science and Technology, 3(7), pp. 881-891, 2008.

(3) Iwata Y., Kishida M., Muto M., Yu S., Sawada T., Fukuda A., Takiya T., Komura A., and Nakajima K., “Narrow size-distributed silicon cluster beam generated using a spatiotemporal confined cluster source,” Chemical Physics Letters, 358(1–2), pp. 36-42, 2002.

(4) Ko S. H., Pan H., Hwang D. J., Chung J., Ryu S., Grigoropoulos C. P., and Poulikakos D., “High resolution selective multilayer laser processing by nanosecond laser ablation of metal nanoparticle films,” Journal of Applied Physics, 102(9), p. 093102, 2007.

(5) Yaga M., Fukuoka H., Iwata Y., and Takiya T., “Behavior of shock waves formed by unsteady supersonic jet injected into cell,” Journal of Thermal Science, 17(1), pp. 50-55, 2008.

(6) Yaga M., Takiya T., and Iwata Y., “Numerical study of unsteady compressible flow driven by supersonic jet injected into elliptical cell with small exit hole,” Shock Waves, 14(5-6), pp. 403-411, 2005.

(7) Haustrup N., and O’Connor G. M., “Nanoparticle Generation During Laser Ablation and Laser-Induced Liquefaction,” Physics Procedia, 12, pp. 46-53, 2011.

(8) Wen S.-B., Mao X., Greif R., and Russo R. E., “Expansion of the laser ablation vapor plume into a background gas. I. Analysis,” Journal of Applied Physics, 101(2), p. 023114, 2007.

(9) Wen S.-B., Mao X., Greif R., and Russo R. E., “Experimental and theoretical studies of particle

generation after laser ablation of copper with a background gas at atmospheric pressure,” Journal of Applied Physics, 101(12), p. 123105, 2007.

(10) Riabinina D., Irissou E., Le Drogoff B., Chaker M., and Guay D., “Influence of pressure on the Pt nanoparticle growth modes during pulsed laser ablation,” Journal of Applied Physics, 108(3), p. 034322, 2010.

(11) Kim H.-D., Kweon Y.-H., and Setoguchi T., “A study of the weak shock wave propagating through an engine exhaust silencer system,” Journal of Sound and Vibration, 275(3-5), pp. 893-915, 2004.

(12) Liang S.-M., and Tai C.-S., “Analysis and prediction of shock-induced near-field acoustics from an exhaust pipe,” Computers & Fluids, 45(1), pp. 222-232, 2011.

(13) Baron A., Mossi M., and Sibilla S., “The alleviation of the aerodynamic drag and wave effects of high-speed trains in very long tunnels,” Journal of Wind Engineering and Industrial Aerodynamics, 89(5), pp. 365–401, 2001.

(14) Uystepruyst D., William-Louis M., Creusé E., Nicaise S., and Monnoyer F., “Efficient 3D numerical prediction of the pressure wave generated by high-speed trains entering tunnels,” Computers & Fluids, 47(1), pp. 165-177, 2011.

(15) Setoguchi T., Kim H.-D., and Kashimura H., “Study of the Impingement of Impulse Wave Upon a Flat Plate,” Journal of Sound and Vibration, 256(2), pp. 197-211, 2002.

Interferometric Measurement of Thickness using a Pico-second Pulse Laser

In this paper, a thickness measuring system using a pico-second pulse laser is proposed. The properties of the Pico-

second Pulse Laser are narrow pulse width, high energy density, high peak power and broad bandwidth of oscillation.

The pulse laser is used for micromachining. But, the coherency of the pulse laser is low due to broad bandwidth.

Moreover, two light waves with optical path difference over the pulse width cannot interfere, then the interference

fringes are not observed. Therefore, in the interferometer using the pulse laser, two path lengths (reference beam,

object beam) must be equal to obtain the interference fringes. In this method, by maximizing the contrast of the

interference fringes, the interferometer with zero path difference between two paths can be constructed. When the

transparent media is placed in the object beam of this zero path difference interferometer, the contrast of the fringe

decreases or vanishes. In this case, zero path difference is achieved by moving the reference mirror to the position

where contrast of fringes is maximum value. The amount of displacement of the reference mirror corresponds to the

path difference occurred by the transparent media. Consequently thickness of the object can be measured by the

amount of the displacement of the mirror. To demonstrate the validity of this method, we show the experiment to

measure the thickness of plastic plate. Experimental results show the validity of this method.

1)

0 2

0

0

2,3)

0

T

I1=I2

m/s mm

laserI

II

Ppulse

(a) (b) (c)

t

L

np

na

ps

M1

0

THORLABS CCS100

PBS3 PBS4

M1

1.10mm np=1.54

5pulse

5

648nm, 4.3nm

0.39mm

0 M1

0.42mm

M1

590

L

1.09mm

na=1.00

1.10mm

M2

Au 19.8

Au

0.2mm

99.99wt% Au

Au

Au Ag

Be

1 Au

Sn Au

Au 99.99wt%

99.9wt%Sn Sn 80wt%

20wt% 15wt% 10wt% 3wt% 1wt% 0.6wt%

9mm

3g

0.01g

Au

Ar

Sn 1at% 0.6wt%

Au

Development of Au – Sn Alloy Fiber by the In -Rotating-Water-Spinning Process

Mitsuyoshi SHIMAOKA and Motoi WADA

The spinnability of pure gold on the In-Rotating-Water-Spinning process is not good because of the low

formability of the oxide film around the molten gold jet. The development of continuous fiber of Au-Sn alloy by this

spinning method has been performed in order to clear the effect on the spinnability of the addition of Sn. The

relation of the amount of Sn and the spinnability has been examined. In Au-20wt%Sn alloy, very long fiber of 12 m

with circular cross section was obtained at the conditions of 120μm in the nozzle diameter, 3.33 s1

in the rotating

drum velocity, 0.40 MPa in the ejection pressure and 0.803 rad in the incidence angle of jet. In Au-Sn alloy

decreased the amount of Sn included to 0.6wt%(1 at%), the wire length decreased to about 100 mm.

�� KLM-

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99.9wt%Snx�G�^�ýG�¿A·óSn·x 80wt%�

20wt%�15wt%�10wt%�3wt%�1wt%3�� 0.6wt%�õ

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��êp?�p�®]YaP��ÆO�a�yzY

^©Cá1ª Au OM��a¬£>TPO�?p�®

]Ya¨�]YaP�OÆ�^�

The spinnability of pure gold on the In-Rotating-Water-Spinning process is not good because of the low

formability of the oxide film around the molten gold jet. The development of continuous fiber of Au-Sn alloy by this

spinning method has been performed in order to clear the effect of the addition of Sn on the spinnability. The

relation of the amount of Sn and its spinnability have been examined. In Au-20wt%Sn alloy, very long fiber of 12 m

with circular cross section was obtained at the conditions of 120�m in the nozzle diameter, 3.33 sÌ1

in the rotating

drum velocity, 0.40 MPa in the ejection pressure and 0.803 rad in the incidence angle of jet. In Au-Sn alloy, the

amount of Sn decreases by 0.6wt%(1 at%), the wire length shortend to around 100 mm.

Í/ ¢£%}M5EÝÞÃóãä�ÎÏCDE5¥55Ãõ

Fig. 1

600mm 60mm

20mm

Ar

Ar

2 Au

Ar

Fig. 1 Schematic diagram of In-Rotating-Water-Spinning

apparatus.

Table 1

SEM : Scanning Electron

Microscope

Table 1 Experimental conditions for In Rotating Water

Spinning method.

Nozzle Diagram, dn [μm] 150 ~ 170

Velocity of Rotating liquid of layer ,

ND [s-1] 3.17 ~ 4.83

Ejection Pressure, Pn [MPa] 0.30 ~ 0.45

Temperature of Coolant, Tf [ ] 9 ~ 20

Coolant H2O, C2H5OH

Distance between nozzle tip and liquid

surface : l [mm] 14 ~ 23

Incidence angle, �� : [rad] 0.58 ~ 0.90

Au Sn Fig. 2

Au-80wt%Sn

Fig. 2 Equilibrium phase diagram of Au – Sn alloy system.

Fig. 1 �ÓãÐ��x��Óãú�o

ó� 600mm�¤ 60mmõxÓã]{�O>�ÑÒ�

��ú�o��.�µbó� 20mmõxZA�^�®

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a�XQêp»czY�Âw�¤³³Éë�1ß4

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^è�¤³³Éë�xFG�¨�X�Oú�oÓãë

�?r�':T��î�IÈ¾�T�¤³³Éë�?

p��@wã�ä·b��> 2õ��¥�P Au

p�>?¨�X�xµè�,G�(:1À��

Ar¯QåÆn�X�,G�Ñ]æ1À�z�¤³³É

ë��v³1�ú�oÓãë�x\ ,G�^P1�

Fig. 1 Schematic diagram of In-Rotating-Water-Spinning

apparatus.

\�çO�ÑÒ�1%] TÕa�XP�µ@èXÙ

��Óã�¥��êp��G�^ÓÔÐb1ZA]

YTPOPÕ^1L1À�

��? Table 1�45>VP�yzY^©Cá��

��ixéËS¢£ê»ëóSEM : Scanning Electron

Microscopeõ>�ì�^�

Table 1/ Experimental conditions for In�Rotating�Water�

Spinning method.

Nozzle Diagram, dn [�m] 150 ~ 170

Velocity of Rotating liquid layer , ND/

[s-1] 3.17 ~ 4.83

Ejection Pressure, Pn [MPa] 0.30 ~ 0.45

Temperature of Coolant, Tf/ [Á] 9 ~ 20

Coolant H2O, C2H5OH

Distance between nozzle tip and liquid

surface : l [mm] 14 ~ 23

Incidence angle, �� : [rad]�� 0.58 ~ 0.90

>��7?P�HQ�

�

>�� RSTUVWXYZ[ \])^_`

/ Au�Sn Iñp��@ía¿¯x Fig. 2 ��

Au-80wt%Snp��Ðg�Å�?�¯��z3�`

Å�

Fig. 2 Equilibrium phase diagram of Au – Sn alloy system.

Au Sn0 10 20 30 40 50 60 70 80 90 100

at%

wt%0 10 20 30 40 50 60 70 80 90

100

200

300

400

500

600

700

800

900

1000

1100 1063

Tem

pera

ture

Concentration

AuS

n

418

232

AuS

n2

AuS

n4

�

260 Sn Pb

363

130μm 0.40MPa

3.67s-1 260

300 Fig. 3

4m

1.8m Fig. 3

1.8m

Fig. 4 a

2m

Fig. 4 b

Fig. 3 Video image of the molten Au – 80wt%Sn alloy jet

flow.

Fig. 4 SEM images of the surface appearances of the

obtained Au – 80wt%Sn alloy fibers.

Sn Pb

Au

Fig. 2 Au 20wt%Sn Au

280

Sn

15wt%Sn 440 10wt%Sn 720

120μm 0.40MPa

3.33s-1 Fig.

5 a b

c d

12m

100mm

Fig. 5 Jet flow of Au – 20wt%Sn alloy and the surface of

obtained wires.

Au 15wt%Sn 170μm

0.35MPa 4.75s-1

Fig. 6 a

b

c

d

Sn 15wt%

500

Au 10wt%Sn 150μm

0.40MPa 3.33s-1

1.2m Fig. 7

Coolant : H2O

Melt jet

Cavity

Water layer

Water surface

Ejectionnozzle

Coolant : H2O Coolant : C2H5OH

b


a b


c d

Coolant : H2O

Melt jet

Cavity

Water layer

Water surface

Ejectionnozzle


b


a b


c d

Fig. 6 Molten Au – 15wt%Sn alloy jet flow, the surface

appearance of obtained wire and its cross sectional shape

Fig. 7 The surface appearance and the cross sectional shape

of obtained Au – 10wt%Sn alloy wires

Au – 5wt%Sn 160μm

0.40MPa 3.33s-1

5.2m

Fig. 8

Au – 15wt%Sn Fig. 6

Fig. 8 The surface appearance and the cross sectional shape

of obtained Au – 5wt%Sn alloy wires

Au – 3wt%Sn Au – 1wt%Sn

170μm 0.35

0.33MPa 4.5 4.83s-1

Fig. 9 a

b

c d mm

Au 5wt%Sn

e f g h

mm

a c e g : Au 3wt%Sn alloy

b d f h : Au 1wt%Sn alloy

Fig. 9 The jet flow of molten Au – 3wt%Sn and Au –

1wt%Sn alloys, the surface appearance of the obtained wires

and their cross sectional shape

Au 1wt%Sn Sn

1% Au 0.6wt% 1at% Sn

170μm 0.35MPa

3.17 4.83s-1

Fig. 10

Fig. 11

a b

dc

a b

500 �m 50 �m

a b

500 �m 100 �m

a b

c d

e f

g h

a b

dc

a b

500 �m 50 �m

a b

500 �m 100 �m

a b

c d

e f

g h

45>��xVÕ^�`�<6x Fig. 9��óaõ

Oóbõ�ò+�>?¤³³É1��aP^1�Óó�

^¹�óócõ�ódõõ�¸]?H mmI�>ÀÕ^�

ú�oÓãë��¤³³Éë�ó¨�X�õ1\�ç

^<6O»czY�¹��? Au�5wt%Sn p��

êp��ôÕaPóóeõ�ófõõ1�ógõ�óhõ¹

�i��Z�?�Ñ�aP�¤³³É1H mm I

�>â�^º>�õ©C�J1#iá��Õa�

Zi�Óö�aPÕ^^èO»czY�

a : N D = 3.17s-1 b : N D = 3.50s-1 c : N D = 3.83s-1

d : N D = 4.17s-1 e : N D = 4.50s-1 f : N D = 4.83s-1

Fig. 10 SEM views of obtained Au – 0.6wt% 1at% Sn alloy

wires.

Fig. 11 The relation between the maximum length of the

obtained Au – 0.6wt%Sn alloy wire and the drum velocity.

100mm

Fig. 12

Fig. 13

2 0.35MPa

Fig. 11

Fig. 12 The jet orbit of molten Au – 1at%Sn alloy in rotating

water layer.

Fig. 13 The relation between the velocity of the jet ejected

from conical nozzle and the ejection pressure.

Au Sn Fig. 14

Sn 10wt% a

a Sn <= 10wt% b Sn > 10wt%

Fig. 14 The ductility of the obtained Au – Sn alloy wire.

a

c

e

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0.58 rad

10 mm

a b

10wt% b

Au 1at% 0.6wt% Sn Fig. 15

Fig. 16 Au

10%

Fig. 17

Fig. 15 The specimen of tensile test piece for the spun wire.

Fig. 16 The stress-strain diagrams of obtained Au –

0.6wt%Sn alloy fibers.

Fig. 17 SEM views of the tensile fracture surface of the

obtained Au – 0.6wt%Sn alloy fiber.

Au 99.99wt%

Sn

Au Sn

Sn

Sn 10wt%

10wt%

Sn 1at% Au

Sn

2011

I. Ohnaka In-Rotating-Liquid Spinning Process,

Encyclopedia of Materials Science and Engineering, R. W.

Cahn and M. B. Bever eds. , Pergamon Press, 1988 , pp.

5874 – 587. 1994

pp. 73 - 78

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a b

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Study on Aging Test Device of the LED

Hiroaki ICHII Takashi MAKINO and Katsutaka TSUKAMOTO

In recent years, the need of LED is increasing rapidly. For this reason, the number of production of LED is also

increasing. There is a process called an aging test in the production process of LED. This aging test is the process of

confirming the durability of LED and looking for what not suiting. There is an examination by people's eye as one of

the methods of an aging test. However, since the light of LED is strong, the tester's asthenopia, failure of eyesight, etc.

pose a problem. So, in this study, the simple exam device by image processing using a Web camera and a personal

computer was developed in consideration of cost and the problem of healthy.

1

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100 1

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Fig2. x-y -

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Fig3.

(x,y)

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(x,y) R

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1 1

x-y

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(Histogram) ( )

( )

2

(1) Correlation

(2) Chi-Square

(3) Intersection

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x-y

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x

x-y (x,y)

(x,y) - 1

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Fig2. x-y -

x-y

x-y

Fig2. Drawing of the -

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(x,y)

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(x,y) R

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1 1

x-y

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2

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(2) Chi-Square

(3) Intersection

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Correlation

1

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(4) -1 1

1 2 -1

2

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Chi-Square (

)

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2

(5) 0 2

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min()

2

2

1 0 1

4

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2 ( )

2

2

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p(x) q(x)

(8) 0 1 1

2

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0 2

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LED 200[mm]

LED

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1[mm] LED

4.5[mm]

LED

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24[V] 0.75[A] 2.1[mm]

OpenCV Microsoft

Visual C++ 2010 Express

(a) LED bar

(b) LED unit

Fig4. LED bar and LED unit

3.2

Fig.5

300×500×650mm Web

LED

Web

1 LED

LED

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1)

2)

3) 4)

5) LED

Web

Fig.6

LED Web 200 mm LED

Fig. 6 Hough Transform

300 300

LED3.

Fig7.Cutting of image

LED

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b LED

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distance

Normal 1 0.999 0.011 0.948 0.054

Normal 2 0.993 0.058 0.900 0.131

Normal 3 0.997 0.049 0.899 0.114

Dimming 0.989 0.115 0.855 0.195

LED LED

LED

5.2

Web LED

Web 150mm LED

LED

10mm

220mm

Fig. 9

Web LED

LED

Out

put v

alue

Distance between objects [mm]

Correlation

Fig9. Change of the result of every condition

Fig.9 150mm 4 LED

4 LED

200mm LED

180mm

6.

Web LED

10%

LED

6

LED LED

[1] / LED

CQ pp.10-17 2008

[2] Open CV

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2

pp.194-198 2009

[3]

pp.21-22 2007

0.6

0.7

0.8

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put v

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Development of a Satellite Data Delivery and Sharing System for Student CubeSat Projects

Fumio ASAI

CubeSat

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bot

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2010

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, pp.118-119, 2012 .

準ストーン代数のシ－ケントによる形式化

荒金憲一

Sequential formulations for quasi-Stone algebras

Kenichi ARAGANE

最小元 0 と最大元 1 をもつ分配束 (bounded distributive lattice : BDL) で半２重否定律 (( 8 8 ) )

とに関するド・モルガン律 (( 9 ) ( ) = )とに関するド・モルガン律 ( ( ) = )を弱めた形 (( 9) ( ) = )と最小元・最大元に関する補元律 (( 10) 0 = 1 ( 10 ) 1 = 0) と矛盾律 (( 11) = 0) を満たす代数系が [2], [4] で定義されている準スト－ン代数 (quasi-Stone algebra(QSA))である．本論文では上の 9 をそれと同値な ( 9 ) ( ) = で置き換えた準ストーン代数 (quasi-Stone

algebra (QSA )) を考察する. そして準スト－ン代数と演繹的に同値な，G. Gentzen の方法 ([3]) でのシ－ケント(式)による形式的体系 GQSA を考える.

1 準ストーン代数 (QSA )

と同様にワ－ドを定義しワ－ド全体の集合をとして項演算と項演算をもつ代数系 A を考える

[ 定義 1 ] の定義の任意の元に対して次のが成り立つとき代数系 A を準ストーン代数と

よぶ．

[ 定義 2 ] 不等式の定義をの任意の元とする．が成り立つときと書く

と同様にして次の定理が成り立つ．

[ 定理 1 ] 代数系 A が準ストーン代数でありつまり～が成り立つかつ定義によりが定義されるの任意の元に対して A で次のが成り立つ．

証明

～とととはの定理の証明と同じであるとすると定義よりこの両辺に否定をとるとから

でからとするととよりで上のを使うとからが成り立つ．

とから成り立つ．とから成り立つ

定義によりが定義されることと～とはの定理の証明と同じであるとよりでを使うと

これらにを使うとこれとにを使ってが成り立つ．

とよりでを使うとこれらにを使うとこれとにを使って

が成り立つ．よりまたとからでを使うとよっ

てからが成り立つ．の定理の証明と同様にから成り立つ証明終

の注意と同様に次の単調性が成り立つ

[ 注意 1 ] 束～と～が成り立つにおいて次のが成り立つについての単調性についての単調性

と同様に次のことが成り立つ

[ 注意 2 ] において次の～が成り立つかつ

かつかつかつ

かつかつが成り立つとき

かつかつかつ証明

よりで仮定のを使ってが成り立つ次にでをにすればさらにで仮定のからよってからが成り立つ

よりが成り立つとするとで仮定よりが成り

立つ　とすると仮定よりでからが成り立つ次にとすると仮定よりでからが成り立つ

よりが成り立つ上の定理のでのの証明と同じでが成り立つとすると定義からで両辺に否定をとり仮定

を使うとまたからでを使ってよってからが成り立つ次にとするとで両辺に否定をとり仮定を使うとよりからで

よりが成り立つ上の定理のでのの証明と同じで次に

で仮定を使うとから同様にしてよりで仮定を使って

からにを使ってが成り立つとするとからで両辺に否定をとり仮定を使うと

よってからが成り立つ次にとするとで両辺に否定をとり仮定を使うとからが成り立つ

のを使うとおく

よってで仮定からでこれととで注意の

の単調性を使ってからこれを使うと

よってこれととでの単調性を使うとところでより

でよりからが成り立つ上のからよってが成り立つ

よりで仮定を使うとよりまたからでが成り立つ次にとすると

からこれに仮定を使うと逆にとするこれととでの単調性を使ってからが成り立つ

でをにするとが成り立つ次にとするこれととでの単調性を使うとから仮定よりが成り立つ上の定理のでのの証明と同じでが成り立つ証明終

ここでのと本論文のとが同値であることがわかる

[ 注意 3 ] とが成り立つとき次のことが成り立つ

証明の定理よりが成り立ちの注意のからが成り立つこれから

本論文の定理よりが成り立ち本論文の注意のからが成り立つから証明終

と同様に次のことが成り立つ

[ 注意 4 ] 束において次のが成り立つ

またはかつ

かつが成り立つとき

証明でをにするとを仮定するよりこの両辺に否定をとりを使うとから次に

を仮定するとからこの両辺に否定をとりを使うとからよってが成り立つ

またよって

が成り立つ次にまたよってが成り立つさらに

よりが成り立つは仮定より明らかである仮定でをにをにするとからまた仮定でもをにをにするとからよってが成り立つこれを使うと 3 4 次に

1 4 3

次に仮定またはでをにすれ

ばが成り立つ証明終

さらにと同様に次のことが成り立つ

[ 注意 5 ] 最小元と最大元をもつ束が成り立つにおいて次の～が成り立つ

かつ

が成り立つときが成り立つとき

かつかつかつが成り立つとき

証明はの注意の証明と同じである

注意のよりが成り立つ仮定から

からが成り立つととでの単調性を使ってからが成り立つ証明終

についてと同様に次の同値性が成り立つ

[ 注意 6 ] A をとする A がであることと次のは互いに同値である

証明A がであるは明らかである A がであるについて

またかつが成り立つから注意のからが成り立ち注意のよりが成り立つ次にからが成り立つ

上の証明と同様にしてとが成り立つ注意のからが成り立つ注意のから

注意のからが成り立つまた注意のからが成り立つ

で仮定を使ってで仮定を使ってで

を使うと次にとおく仮定を使ってこれととで

の単調性を使ってよってこれより仮定を使ってか

らこれととでの単調性を使ってここで

よってここでに仮定を使うとまたよりこれと

とでの単調性を使ってより仮定からよってからでを使うと

が成り立つまたからが成り立つ仮定でをにすればが成り立つ証明終

2 QSA のシ－ケントによる形式的体系 GQSA

と同様にシ－ケントの定義をするただし 1 n と 1 m はでそれぞれ 1 n と 1 m とに解釈する

このとき準ストーン代数のシ－ケントによる形式的体系をと同様に次のように定義する

[ 定義 3 ] の定義始式

推論規則構造に関する推論規則

1 2

1 2

1 2

1 2

1 1 2 2

1 2 1 2

論理記号に関する推論規則

1 2

1 2

ただしが 1 m のときは m 1 を表しのときはとする

[ 注意 7 ] 次のが成り立つ

証明：：：

：：：

証明終

3 QSA と GQSA の演繹的同値性

と同様にシ－ケントがで証明可能であるときと書くまた不等式がで成り立つときと書くさらにと同様にでの等号を定義してリンデンバウム代数を考える

このときと同様にして次のことが成り立つ．

[ 定理 2 ] をワ－ドとするとき次のことが成り立つ．ならば

証明のすべての公理～がで証明可能であることを示せばよいがこれらと同値な

～がで証明可能であることを示す～はの定理の証明と同じである

始式から成り立つ

：始式から成り立つ

証明終

[ 定理 3 ] 1 m 1 n をワ－ドとするとき次のことが成り立つ1 m 1 n ならば 1 m 1 n

証明が 1 m のとき 1 m をで表すが 1 n のとき 1 n をで表す

の始式はそれぞれからで成り立つ．次にの各推論規則の上式上のシ－ケントに対応する不等式がで成り立つと仮定するとき下式に対応する不等式がで成り立つことを示せばよい．

～はの定理の証明と同じであるとするとからよりで

ありよりであるからが成り立つ次にがないときとするとからが成り立つまたがないときとすると

よりで注意のからであるからが成り立つさらにとがないときとするとよりでよりであるから

が成り立つ最後にがないときとするとよりでであるからが成り立つ

かつとするとよりからでよりが成り立つ証明終

以上によりとが演繹的に同値であることがわかる．

参考文献

荒金憲一代数とストーン代数のシーケントによる形式化奈良高専研究紀要荒金憲一準ストーン代数のシーケントによる形式化奈良高専研究紀要

Tool Wear of Polycrystalline Cubic Boron Nitride Compact Tools in Cutting Hardened Steel

Tadahiro WADA

Advanced Materials Research, Vols. 488-489 (2012) pp 724-728.

In recent years, many difficult-to-cut materials such as

hardened steels, sintered steels, cast irons, etc., are widely used. One of these difficult-to-cut materials, hardened steels, are quenched and tempered to improve their mechanical properties and wear resistance. For dimensional accuracy, hardened steels are required to be machined by the metal removal process. As these steels are required to be machined under high efficiency to improve productivity, it is necessary that the tool materials have good wear resistance. Polycrystalline cubic boron nitride compact (cBN) seems to be an effective tool material because it has better features as a tool material such as good heat resistance, high hardness, etc. So, concerning the cutting of hardened steel, there are many studies on the tool wear of cBN tools [1, 2]. However the cutting performance of cBN tools depends on the binding material, etc. [3, 4, 5]. Therefore, an effective binding material, etc. for cBN tools should be selected for the cutting of hardened steel. Furthermore, in a cBN tool, the cutting edge is often formed by chamfering plus honing so as to improve both the strength of the cutting edge and the chipping resistance. And the shape of the chamfered and honed cutting edge, namely the chamfer width and chamfer angle, influences the tool wear.

In this study, in order to identify an effective cBN tool for the cutting of hardened steel, the influences of both the cBN content and the cBN particle size on tool wear at various cutting speeds was experimentally investigated. The hardened steel used was an ASTM D2 cold-worked die steel (JIS SKD11, 60HRC).

The hardened steel was turned with three kinds of cBN tools, which had different contents ratios, different cBN particle sizes, and different binding materials. Furthermore, three kinds of chamfered and honed cutting edges were also used. This will contribute to improvement of productivity in the case of cutting hardened steels.

The main results obtained are as follows:

(1) In the case of the cBN tool with a cBN particle size of 5.0 �m, the tool life of the cBN tool with a cBN content of 75% was longer than that of the cBN tool with a cBN content of 45% at low cutting speed. However, at high cutting speed, the tool life of the cBN tool with a cBN content of 75% became shorter.

(2) The tool life of the cBN tool with both a cBN content of 55% and a cBN particle size of 0.5 �m was the longest.

(3) The tool wear of cBN tools decreased with a decrease in chamfer width.

ACKNOWLEDGMENTS

The author would like to express thanks for the cooperation of Tungaloy Corporation for the supply of cBN turning inserts.

REFERENCES [1] E. Sentoku, Y. Fujimura: Research on the Cutting Mechanism of Hardened Steel by cBN Tool, Journal of Japan Soc. Powder and Powder Metallurgy, 1989, 36(2), pp.125-129. [2] N. Narutaki, A. Murakoshi: Machinability of Sintered Steels, Journal of Japan Soc. Precision Engineering, 1981, 47(12), pp.1516-1522. [3] K. Shintani, H. Katoh, et al.: Cutting Performance of CBN Tools in Machining of Nickel Based Superalloy, Journal of Japan Soc. Precision Engineering, 1992, 58(10), pp.1685-1690. [4] K. Shintani, H. Katoh, et al.: Cutting Performance of CBN Tools in Machining of Austempered Bainitic Spheroidal Graphite Cast Iron, Journal of Japan Soc. Precision Engineering, 1990, 56(12), pp. 2261-2266. [5] H. Katoh, K. Shintani, Y. Fujimura: Wear Performance of CBN Tool in Machining of ADI, Trans. of JSME, Series C, 1991, 57(541), pp.3027-3031.

Surface Modification of Aluminum Alloy using Plasma Based Ion Implantation and Deposition

Tadahiro WADA, Jun NAKANISHI*, Yasuhiro MIKI**, Makoto ASANO**, Koji IWAMOTO*** and Hiroyuki HANYU***

Advanced Materials Research, Vols. 488-489 (2012) pp 960-966.

Aluminum alloy has a high strength-to-weight ratio,

good corrosion resistance and easy recyclability. In finish cutting at a small feed rate, it has a negative influence on the cutting operation because of continuous chips. Usually, Pb and Bi are added in order to break the continuous chips. The chips become brittle because Pb or Bi, which have a low melting point, are dissolved by the cutting heat, and the chips are broken easily. Therefore, free-machining aluminum alloys such as 6262 aluminum alloy, containing 0.4�0.7mass percent Pb and Bi, are widely used. However, the use of Pb will be prohibited to avoid environmental damage, and it is necessary to improve the chip breakability without adding Pb. In order to clarify the influence of the Si contents added to the 6061 aluminum alloy on the chip control performance, aluminum alloys that have different Si contents, namely 2 mass%, 4 mass%, 6 mass% Si, were drilled with a high speed steel drill. A previous study reported that Si addition increases the chip breaking performance [1]. Moreover, it was reported that Si addition increases the chip breaking performance in the case of turning with a high speed steel tool, too[2].

Aluminum alloys are used for mechanical parts, but the alloys have poor wear-resistance. To increase their wear resistance, a hard coating is applied to the surface of the alloys. Diamond-like carbon (DLC) is applied in surface modification technology due to its superior mechanical characteristics such as wear and abrasion resistance, low friction, high hardness, anti-reflectiveness, etc. In order to improve the wear resistance of 6061 aluminum alloy, a new surface modification method was presented [5]. In this method, the inner layer of anodic oxide coating, the intermediate layer of CrN layer and the outer layer of DLC layer was used. Moreover, this method is indicated for DLC coating of aluminum alloys having different Si contents. However, in this method, it is necessary to reduce production costs. In addition, adhesion between the substrate and the DLC is slightly inferior.

In this study, in order to clarify an effective surface modification to improve the wear resistance of aluminum alloys, a new coatings-substrate system was developed. This new coating-substrate system consists of nitriding pretreatment of the substrate, the intermediate layer of the silicon-based film and the outer layer of the DLC film using plasma based ion implantation and deposition (PBIID). The DLC film was deposited on three kinds of aluminum alloys that have the different Si contents, by this coatings-system.

In order to determine the influence of the Si contents on the mechanical properties of the DLC film, SEM observation of the cross section of the coating layer, the adhesion and the wear resistance of the coating layers were experimentally investigated.

As a result, the increase of the Si contents showed no negative influence upon the mechanical properties of the DLC film.

The main results obtained are as follows: (1) In the case of the DLC un-coated aluminum alloys, rapid

progress of the friction coefficient in the case of the 10-N load was found at the short sliding distance.

(2) The hardness of the DLC film was not decreased with the increase of Si contents. And the increase of Si contents did not have a negative influence upon the hardness of the DLC film.

(3) The frictional coefficient of the Al-4%Si alloy was the smallest, the frictional coefficient of the DLC film was decreased with the increase of Si contents, and it was effective for improvement of the frictional coefficient to increase Si contents.

As mentioned above, it is clear that the new coating-substrate system is effective for improving the adhesion between the substrate of the aluminum alloy and the DLC film. Moreover, the increase of the Si contents does not have a negative influence upon the mechanical properties of the DLC film, rather, the increase of Si contents was effective for decreasing the frictional coefficient. REFERENCES [1] S. Yoshihara, M. Hirano, T. Eto: Journal of Japan Institute of Light Metals, Vol.51, No. 4(2001), p. 238(in Japanese) [2] T. Wada, K. Hiro, J. Fujiwara, S. Hanasaki, S. Yoshihara, T. Sasayama: Proceedings of International Conference on Precision Engineering (IcoPE2003/04), (2004), p.191 [3] Japan Society for Precision Engineering: Handbook of Precision Machining, CORONA PUBLISHING CO., LTD., (1992), p.69 (in Japanese) [4] A. Kawana: Journal of the Japan Society for Abrasive Technology, Vol.46, No. 5(2002), p.214(in Japanese) [5] T. Wada, J. Fujiwara: Material Science Forum, Vols.519–521 (2006), p.765

---------------------------------------------------------------------- *Faculty of Advanced Engineering ** Nara Prefectural Institute of Industrial Technology *** OSG Corporation

Tool Wear of Diamond-like Carbon-coated High-speed Steel with a Cr-based interlayer in Cutting of

Aluminum Alloys

Tadahiro WADA, Koji IWAMOTO* and Hiroaki SUGITA*

Applied Mechanics and Materials, Vols. 152-154 (2012) pp 74-79.

As 6061 aluminum alloy has both a high

strength-to-weight ratio and good corrosion resistance, it is used for automobile parts or motorbike parts. In finish cutting at a low feed rate, it has a negative influence on the cutting operation because of continuous chips. Usually, Pb and Bi are added in order to break these continuous chips. The chips become brittle because Pb or Bi, which has a low melting point, is dissolved by the cutting heat, and the chips are easily broken. Therefore, free-machining aluminum alloys such as 6262 aluminum alloy, containing 0.4� 0.7 mass percent Pb and Bi, are widely used. However, from the standpoint of environmental protection, it is necessary to improve chip breakability without adding Pb. In order to clarify the influence of Si content added to 6061 aluminum alloy on chip control performance, aluminum alloys having different Si contents were drilled by a high-speed steel drill. As a result, it was found that Si addition increases chip breaking performance [1]. Next, 6061 aluminum alloy-based Al-Si alloys, which have different Si contents, were cut with a high-speed steel tool. The tool wear was investigated experimentally. The tool wear increased with an increase in Si content [2]. There are various methods of surface modification technology for giving wear resistance to the surface of a material. In surface modification technology, hard materials such as ceramics are coated onto the surface of another material. Diamond-like carbon (DLC) is coated onto the surface of high-speed steel tools to improve their wear resistance. So, aluminum alloys were turned by a DLC-coated cutting tool, and tool wear was investigated experimentally. As a result, in cutting Al-2%Si alloy, the wear progress of the DLC-coated tool is slower than that of the uncoated tool, and the effect of wear resistance of the diamond-like carbon is recognized. However, in cutting Al-4%Si alloy, there is little difference in the wear progress between the DLC-coated tool and the uncoated tool [3]. The multilayer coating system is designed to have both good substrate adhesion of the inner coating film and superior wear resistance of the outer coating film. However, in the concept of the design of a multilayer coating system, not much information is available in the open literature on "suitable" constituent materials to be chosen as the inner

layer, intermediate layer(s), and outer layer [4]. Therefore, a Cr-based interlayer, namely (Al,Cr)N, was developed as an intermediate layer and it is effective for improving the wear resistance of DLC-coated tools.

In this study, in order to clarify the influence of a diamond-like carbon (DLC) coating layer with a Cr-based interlayer, namely (Al,Cr)N, on cutting performance, aluminum alloys having different Si contents were turned. The substrate of the tool material was high-speed steel (1.4%C). Tool wear and surface roughness were experimentally investigated.

The following results were obtained: (1) In cutting two kinds of Al-Si alloys, namely Al-2%Si

alloy and Al-4%Si alloy, the wear progress of the DLC/(Al,Cr)N-coated tool was slower than that of the DLC-coated tool. Therefore, the (Al,Cr)N interlayer was effective for decreasing the tool wear of the DLC-coated tool.

(2) The wear progress of the two kinds of the DLC-coated tools in cutting of Al-4%Si alloy was faster than that in cutting of Al-2%Si alloy.

(3) In cutting of Al-2%Si alloy with a (Al,Cr)N/DLC-coated tool, the surface roughness was almost constant in the range of a cutting distance from 0.1 km to 9.5 km.

REFERENCES [1] S. Yoshihara, Masakazu Hirano, and Takehiko Eto: Journal of the Japan Institute of Light Metals, Vol. 51, No. 4 (2001), p. 238. [2] T. Wada, K. Hiro and J. Fujiwara: International Journal for Manufacturing Science & Technology Vol. 5, No. 2, 2003/2004, p. 39. [3] Tadahiro Wada: “Cutting Performance of Diamond-Like Carbon Coated Tool in Cutting of Aluminum Alloys,” Materials Science Forum Vols. 638-642(2010), p.368. [4] K. N. Strafford: “Progress in Coated Cutting Tool Science and Technology,” Advances in Surface Engineering, Vol. III (Engineering Applications), edited by P. K. Datta, J. S. Gray, and Gray Burnell, Royal Society of Chemistry (1997), p.364.

---------------------------------------------------------------------- * OSG Corporation

Properties of TaN Coating Film Deposited on WC-Co-based Cemented Carbide using Magnetron

Sputter Ion Plating

Tadahiro WADA, Koji IWAMOTO*, Keizo TSUKAMOTO** and Kazuki HIRO

Applied Mechanics and Materials, Vol. 87 (2011) pp 186-190.

Various methods of surface modification technology are

available for yielding high function characteristics such as wear-resistance, lower or higher friction coefficient, corrosion-resistance and thermal-resistance on the surface of the material. Generally, the coating of a hard material like ceramic on the surface of a material is a popular surface modification technology. The physical vapor deposition (PVD) method, which is one of the coating technologies, is widely used because it can be coated at a lower treatment temperature of 470K – 870K [1].

In cutting, e.g. turning, milling, drilling and tapping, coated cemented carbide tools, which have good fracture toughness and wear resistance, seem to be effective tool materials. In this case, the titanium based films (e.g. TiN, (Ti,Al)N) are generally used as the coating film [e.g. 2, 3].

On the other hand, in cutting carbon steel with WC(tungsten carbide)-Co cemented carbide tools at high cutting speed, the wear resistance (in particular crater-wear-resistance) can be improved by adding TiC and TaC to WC-Co cemented carbide [4]. The thermal stability of TiC and TaC is better than that of WC at high temperature, the affinity with Fe of TiC and TaC is lower than that of WC, and the oxidation resistance (anti-oxidation) of TiC and TaC is higher than that of WC. Furthermore, the strength of WC-Co cemented carbide at room temperature is decreased by adding TiC and TaC to WC-Co cemented carbide; however, both the strength at high temperature and the creep-resistance of WC-Co cemented carbide can be improved by adding TiC and TaC to WC-Co cemented carbide [5].

On this account, in cutting carbon steel with WC-Co cemented carbide tools, adding TiC and TaC to WC-Co cemented carbide is effective for improvement of the wear resistance of WC-Co cemented carbide [4]. Therefore, the titanium based films are generally used widely as the coating films. However, the tantalum based films (e.g. TaN, TaC) are not applied as the coating film for cutting tools because the melting point of TaC is higher than that of TiC. Moreover, it is unclear whether TaN coating film can be used as a coating film of WC-Co cemented carbide cutting tools.

In this study, in order to clarify the effectiveness of tantalum (TaN) coating film, TaN coating film was formed

on the surface of the substrate which was a cemented carbide ISO K10 by the magnetron sputter ion plating process, and the thickness, the hardness and the scratch strength (critical load measured by scratch tester) of TaN coating film were measured. The hardened steel ASTM D2 (JIS SKD11) was turned with two types of PVD coated cemented carbide tools, namely TaN and (Ti,Al)N coated cemented carbide tools. The tool wear of the TaN coated cemented carbide tool was experimentally investigated and compared with that of the (Ti,Al)N coated tool. The substrate base metal of the coated carbide tools is cemented carbides ISO K10.

The following results were obtained: (1) Droplets on the surface of the TaN coating film, which

has the K10 substrate, were negligible. (2) The micro-hardness of TaN coating film 2510HV was

higher than that of TiN coating film 2090HV, and there was little difference in hardness between the TaN 2510HV and (Ti,Al)N 2710HV.

(3) The critical scratch load of TaN coating film over 130N was higher than that of TiN coating film 68N or (Ti,Al)N coating film 73N.

(4) In cutting the hardened steel using TaN and (Ti,Al)N coated tools, the wear progress of the TaN coated carbide tool was almost equivalent to that of the (Ti,Al)N coated carbide tool.

The above results clarify that the TaN coating film, which is a new type of coating film, has both high hardness and good adhesive strength, and can be used as a coating film of WC-Co cemented carbide cutting tools. REFERENCES [1] A. Kawana: Journal of Japan Society for Abrasive Technology, Vol.46-5(2002), p.214 (in Japanese) [2] K. Sakagami, G. Yongming and T. Yamamoto: Pro. 4th Int. Conf. on Progress of Cutting and Grinding, (1998), p.38 [3] H. Nakagawa, T. Hirogaki et al.: Pro. 6th Int. Conf. on Progress of Machining Technology, (2002), p.81 [4] Japan Society Precision Engineering: Handbook of Precision Machining, CORONA PUBLISHING Co., Ltd., (1992), p.61 (in Japanese) [5] Kazuki Okada: Journal of Japan Society for Abrasive Technology, Vol.54-4(2010), p.202 (in Japanese)

---------------------------------------------------------------------- * OSG Corporation **Ayabo Corporation

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奈良工業高等専門学校　研究紀要第4８号

平成 25 年３月1 5日

編集兼発行者

奈良工業高等専門学校大和郡山市矢田町22

ISSN　0387－1150RESEARCH REPORTSOF NARA NATIONAL COLLEGE OF TECHNOLOGY

NO. 48, 2012CONTENTS

Powder Metallurgy implemented to the Hands-on Education for Introducing Metalworking Technology to Young Students 　　…………………………… Yukinori TANIGUCHI , Kouki OKUMURA , Toshifumi NAKANISHI , Mitsunori OZAKI ,

Tatsumi ICHISE and Koutaro YAMANO ………… 1

Study of Unsteady Supersonic Jet using Shock Tube with Small High-Pressure Chamber 　　……………………………………………… Hiroshi FUKUOKA , Minoru YAGA , Toshio TAKIYA and Ikurou UMEZU ………… 7

Interferometric Measurement of Thickness using a Pico-second Pulse Laser 　　

………………………… ＹｏｓｈｉｈｉｒｏＯＳＨＩＤＡ ………… 13

Development of Au ‒ Sn Alloy Fiber by the In-Rotating-Water-Spinning Process　　…………………………………………………………………………………… Mitsuyoshi SHIMAOKA and Motoi WADA ………… 17

Study on Aging Test Device of the LED　　 ……………… Hiroaki ICHII ， Takashi MAKINO and Katsutaka TSUKAMOTO ………… 23

Development of a Satellite Data Delivery and Sharing System for Student CubeSat Projects　　 ……………… Fumio ASAI ………… 29

Sequential formulations for quasi-Stone algebras*　　 ………………………………………………………… Kenichi ARAGANE ………… 31

Abstracts …………………………………………………………………………………………………………………………………………… 38

Documents

研究紀要 - 奈良工業高等専門学校 · produced. The results of questionnaire show that the all student had enjoyed and almost all students have got interest in metalworking