Capstone Design Team. CHI-A 20081838 20071223 20091798 20091804
20111901
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Bending Machine for Orthodontic Archwires
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1 Problem Statement Project Objectives 34 1 2 Test &
Evaluation Index 3 Design Process 5 6 Final Product History
Log
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4 Why is it expensive? Components Technique Expert (dental
technician) Bracket Orthodontic Archwires Monopoly on technique
Problem Statement 1 Dental clinic
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5 We decide to change the Current Situation Problem Statement 1
In USA and Europe there exist Bending Machines for Orthodontic
Archwires. To Design a Bending Machine To Develop Local
Techniques
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6 Why have we chosen this subject? Project Objectives 2
Designing a Bending Machine in our own way I.Less Expensive Product
II.Local Production Makes Possibilities
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7 Project Objectives These are the objectives we will
accomplish. Project Objectives 2 1 2 3
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8 Project Objectives Project Objectives 2 Linear motion
Rotation Bending Wire 3 DOFs are needed for wire bending I. 3
degrees of freedom
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9 Project Objectives Project Objectives 2 Computer (LabVIEW)
Processor (sbRIO) Motor operation II. Simple program to operation
(LabVIEW)
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10 Project Objectives Project Objectives 2 III. High quality
product CompetitorsObjectives Minimum bending length 2.2mm
(Orametrix, USA) Less than 2mm Bending angle error less than 1.2
degree (Orametrix, USA) less than 1.2 degree Available wire shape
round and square (Orametrix, USA), square (3M, Germany) round and
square
12 Concept Development & Analysis This page is about Our
initial design concept and its development. Design Process 3 Linear
motion Rotation Bending Wire
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13 Concept Selection This page is about the bending part.
Design Process 3 Ideas for Actuation Part Bending in 2 ways to
realize 3D product (X) design of the lower driving part = difficult
Idea. A
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14 Concept Selection This page is about the bending part.
Design Process 3 Ideas for Actuation Part Idea. B Grabs for holding
a wire Bending (X) limitation: not able to 3Dproduct
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15 Concept Selection This page is about the bending part.
Design Process 3 Ideas for Actuation Part Idea. C Grabs for holding
a wire Bending Rolling This type satisfy all of required
functions
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16 Concept Selection This page is about the bending part.
Design Process 3 Ideas for Bending Part
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17 Concept Selection This page is about the bending part.
Design Process 3 Ideas for Bending Part 1) Consideration - Force -
Accuracy - Simplicity (Price, Space)
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18 Concept Selection This page is about the bending part. We
confirmed that the step motor offers sufficient force for bending
wires. Design Process 3 Spec 5 phases, 0.072deg/phase 3.64V, 1.4A
20N*m holding torque 1:10 gear ratio
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19 Concept Selection This page is about the bending part. Among
three concepts, we had to select the one after the consideration
about simplicity and accuracy. Design Process 3 Three ideas for
bending part Using hole Using clamp Using pin**
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20 Concept Development Finally, pins and guides are used for
bending parts. Design Process 3 Guides Pins Engaging part of the
Pin and the Motor Wire Motor Installing the two Guides in order to
allow for bi-directional bending
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21 Manufacturing Hardware Stage This is our final design of
bending machine. Design Process 3
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22 Manufacturing Hardware Stage This picture shows our
assembled bending machine. Design Process 3
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23 Manufacturing Stage We are working on developing codes using
Labview. Design Process 3 1. Initialization 2. Check 3d graph,
first slope 3. Tuning the property of bending wire (company, shape,
thickness)
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24 Manufacturing Stage We are working on developing codes using
Labview. Design Process 3 Make pulses by bending point data
Monitoring by array 1. Using first slope and data of bending point
make pulse 2. The pulse go next step *Can monitoring
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25 Manufacturing Stage We are working on developing codes using
Labview. Design Process 3 Control in FPGA 1. Linear motion, roll,
bending in FPGA 2. Control motors by pulses
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26 Why is it required to have tests? Because of Spring-back
effect, test is required. Test & Evaluation 4 By experiment, we
need to figure out spring-back coefficient. Measure the angle while
pulse is increasing.
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27 We did the experiment. Test & Evaluation 4 Fitted
function We considered pulse(input signal) and bent angle(output).
These kind of experiments were conducted by Protractor. (instead of
microscope because of the situation of a corporation) In final
presentation, this slide would filled with experiment data.
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28 After Assembling of the machine, we manufactured wires.
Accuracy is very important as well as simple structure. However,
errors occured. Test & Evaluation 4 Checking the Accuracy by
comparison Graph of desired data ~ Bent wire on the test Good
Accuracy - Desired accuracy Bad Accuracy - Visible error -
Summation of error occur summation of error start from here
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29 We got better accuracy after spring-back test. Test &
Evaluation 4 The bent wire and the graph exactly match together.
(good accuracy) This result need to be verified by microscope.
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30 Bending Machine for Orthodontic archwires Maybe,
Demonstration or Simulation Video will be shown here. Final Product
5
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31 History Log What we done. History Log 6
DatesubjectDatesubject 9/11 Problem statement, Background, Concept
development, 10/26 Final presentation from 9/18 Patent(check,
confirmation), Get useful knowledge for design process 11/6 Make
form of algorithm (software), assembling hardware 9/25 Check
necessary parts, Mechanism of concept, Design thinking 11/13 Make
code of algorithm (software), assembling hardware 10/2 Find
existing machine, Design selection, Use paper 11/20 Re-arrange
algorithm (Labview), spring back coefificient test 10/6 Spec of
motor, Design thinking, choose final concept (actuation part)
11/28, 12/5 Repeat the Test in terms of input and output to
minimize the error
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32 Any question and advice are welcome :D Do not hesitate. Just
raise your hands. Question & Answer