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AUTODESK INVENTOR - Chi tit dng tm

CHNG 3

THIT K CC CHI TIT DNG TMCc chi tit hoc vt th to ra t cc tm kim loi cng nh cc tm vt liu khc c s lng khng nh trong i sng cng nh trong cc my cng nghip. AutoDesk Inventor ginh mt phn ring bit cho vic thit k cc chi tit t vt liu dng tm, to ra cc cng c c bit chuyn dng thit k cc m hnh dng tm (Sheet Metal) mt cch thun tin v hiu qu nht. Trong chng ny chng ta nghin cu cc lnh thit k cc chi tit t vt liu dng tm.

3.1 KHI TO BN THIT KC hai cch khi to cc lnh trn thanh cng c m hnh dng tm - Sheet Metal. 1- Dng tp tin mu Tp tin mu l Sheet Metal.ipt. KHI TO: Trnh n: New Sheet Metal.ipt Khi khi ng, cng nh chi tit dng khi, mt phng hnh phc hin ra ngi dng to hnh phc. Khi to xong hnh phc (tu theo mc ch thit k v lnh to tm yu cu), thanh lnh to hnh cho tm hin ra:

Trong phn ny chi tit c s l mt tm. Nhng trong qu trnh thit k, nu cn c hnh khi khng phi dng tm, c th chuyn i bng lnh: Convert -> Model hoc dng cc lnh trn thanh cng c Features to hnh khi. Sau khi c mt tm c to ra, thanh lnh tr thnh:

2- Khi to ngay trong m hnh khi rn Trong khi thit k cc m hnh khi rn nu cn c hnh khi dng tm, c th chuyn i bng lnh trn trnh n: Convert -> Sheet Metal.

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3.2 CC LNH THIT K CHI TIT DNG TM3.2.1 TO TM C S 3.2.1.1 Lnh Sheet Metal Styles NGHA: To kiu tm kim loi. DNG LNH: Thanh lnh: GII THCH: Khi to mt tm kim loi phi tun theo mt phng thc nht nh. Mi phng thc c thit lp trong mt kiu. Trong phng thc nh ra b dy cho tm, bn knh cong ti cc np un v.v... Chng ta c th to ra cc loi tm phong ph v kch thc v hnh dng theo cc kiu khc nhau. Lnh ny gip chng ta to ra cc kiu . Hp thoi xut hin:

Style List - lit k tn cc kiu tm c. Ti y lun c tn Default (mc nh). Active Style - gn kiu cho tm ang to. Nhn nt chn mt trong cc kiu to gn cho tm ang lm vic. Mi chi tit hoc hnh khi ch c th c chn mt kiu. New - to ra phng thc mi. Ti u tin ca Style List hin dng: Copy of Default. C th xo tn ny cho tn khc. Tn kiu mi c hin ti bn di.

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Delete - xo tn kiu khi danh sch. Manage - qun l cc kiu. Dng ly cc kiu ca chi tit to p dng cho chi tit hin thi. Hp thoi hin ra:

tm tp cha tm to. Khi c tm, tn kiu tm thuc tp Nhn nt hin ra ti Source Document. nh du chn kiu, nhn nt Copy chuyn vo tp cha chi tit hin hnh (Active Document). Nhn Close kt thc cng on ny. Mi kiu c to ra ng vi cc thng s ti cc mc sau: 1- Mc Sheet - nh dng tm Trong ny gm: Nhm Sheet - tm Material: vt liu. Dng nt hin danh sch v chn vt liu. Thickness: b dy tm. Cho gi tr bng mm hoc in. Nhm Flat Pattern - cc phng php khai trin Unfold Method - phng thc cn. Nhn nt chn cc phng php: Linear: lien tc. Bend Table: cn tng tm. Unfold Method Value - gi tr ca phng thc cn. Nu phng thc cn l Linear, gi tr ny l K Factor. H s K tham gia vo vic quyt nh bn knh cong ti cc np un (Bend). Gi tr ny trong khong t 0 n 1.

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AUTODESK INVENTOR - Chi tit dng tm Cng thc tnh: Nu phng thc cn l Bend Table, gi tr ny l Default. 2- Mc Bend - Thng s un Hp thoi c cc tham s:

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Radius: bn knh cung ln. Mc nh bng b dy ca tm (Thickness), c th g s trc tip hoc nhn nt chn cc tham s khc cho trong cc ln trc. Minimum Remnant: phn d ti thiu. Mc nh bng 2 ln b dy. Transition: on chuyn tip gia hai mt. Nhn nt chn cc phng thc to on chuyn tip gm: None: khng nh hnh. Intersection: giao im. Straight Line: ng ko thng. Arc: cung trn. Relief Shape: hnh dng on tip gip vi mt khc. Nhn nt chn cc phng thc to on tip gip gm: Straight: thng gc. Round: v trn. Relief Width: b rng phn tip gip. Mc nh bng b dy (Thickness), c th g s trc tip. Relief Depth: chiu su phn tip gip. Mc nh bng 0,5 b dy (Thickness* 0.5), c th g s trc tip.

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3- Mc Corner - gc Gm cc thng s:

Reliet Shape: hnh dng on tip gip. Nhn nt chn cc phng thc to on tip gip gm: Square: vung gc. Round: v trn. Tear: hnh git nc. Trim to Bend: ct b phn tha n mt cong. Relief Size: kch thc phn tip gip. Mc nh bng 4 ln b dy (Thickness* 4), c th g s trc tip.

3.2.1.2 Lnh Face NGHA: To ra tm phng t hnh v phc 2D khp kn. DNG LNH: Thanh lnh: GII THCH: thc hin c lnh, phi dng Sketch2D v mt hnh khp kn. Chng ta xt cc trng hp c th xy ra. 1- Bt u to tm ch th Sau khi ra lnh, hp thoi xut hin:

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AUTODESK INVENTOR - Chi tit dng tm Mc Face Shape - hnh dng tm - chn bin dng.

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- hng pht trin b y ca tm. Chng ta bit, b dy ca tm ( Thickness) c cho ti lnh Sheet Metal style, y chng ta ch nh hng nng bin dng thnh tm. Trn bn v, bn trong bin dng c t mu xanh ng thi c mi tn ch hng to b dy (vung gc vi mt phng bin dng), ta c th nhn nt ny c hng ngc li. Mc Unfold Options v Bend Relief Options Cc thng s c gii thch ti lnh Sheet Metal style. Nhn OK kt thc lnh, tm phng c to ra.

2- To thm tm khc khi c tm ch Hp thoi xut hin:

Trong hp thoi c thm nhm Bend, cho thng s np un ni mt c vi mt mi. Radius: bn knh cung ln. G s hoc nhn nt hin ra cc bin s t trc: Measure: ly theo di ca mt i tng o c trong bn v. BendRadius: ly bng bn knh t ti Sheet Metal Style. Thickness: ly bng b dy tm. List Parameters: chn theo cc tham s ci t, mt danh sch hin ra:

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Cc tham s ny c gii thch ti lnh Sheet Metal Style. chn cnh ca tm ch ni vi tm mi.

Nu khng chn cnh ni tip, hai mt tch ri nhau.

cho mp cung ln song song vi mp tm mi. Nhn nt ny, cung ln gia hai tm c dng nh hnh a, khng nhn nh hnh b.

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a

b

3.2.1.3 Lnh Contour Flange NGHA: To ra tm dc theo bin dng v phc 2D h. DNG LNH: Thanh lnh: GII THCH: Lnh ny c nhng cch p dng khc nhau. C th thc hin vi mt bin dng c lp hoc bin dng km thm vo mt hnh khi hoc tm c. 1-Bin dng c lp Dng 2DSketch v mt bin dng h.

Ra lnh Contoure Flange, hp thoi xut hin:

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Trong hp thoi c cc mc: Mc Contoure Flange Shape - hnh dng tm - chn bin dng. - hng pht trin b y ca tm. Tng t nh lnh Face. Bend Radius: bn knh cung ln. Xem trong lnh Face. Nhn nt hin ra mc Extents bn di.

Trong ny c: Distance: cho b rng tm. G s vo nhp liu. Nt hoc nh hng pht trin b rng tm.

Mc Unfold Options v Bend Relief Options c gii thch ti lnh Sheet Metal style. Nhn OK kt thc lnh, mt mt c to ra (hnh bn phi hp thoi). 2- Bin dng kt hp vi hnh khi hoc tm c Ta v thm mt bin dng ni vo mt c.

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Hp thoi c dng:

Cc tham s v cc nt mi c kch hot. nh gii thiu phn Face. chn cnh ca tm ch ni vi tm mi. Nhn nt hin thm Nhm Extents -> Type. Nhn nt chn cc phng n ko di to b rng ca tm. Edge: chn cnh ca hnh khi c lm chun cho hng pht trin v ln ca b rng tm. Dng chut nhn chn cnh cn thit.

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Distance: cho b rng tm. Nh trng hp bin dng c lp. Width: cho b rng tm v dng tm cch im chun mt khong. Lc ny ti hp thoi xut hin 2 nhp liu: Offset: khong cch t tm n im chun. Khong cch ny c xc nh nh sau: Nhn nt chn cnh ca hnh khi c lm chun cho hng pht trin ca b rng tm. chn im chun. im ny phi l cc im gc Nhn nt ca chi tit. Nhn chut vo u mt ca cnh va chn, lng offset ca mp tm c tnh t im ny. Width: b rng ca tm. Cho mt gi tr. Nhn nt chn hng pht trin. Kt qu ch tip gip, chuyn tip, un cong u c ly cc gi tr t lnh Sheet Metal styles.

Offset : cho b rng ca tm bng cch cho khong cch t tm n 2 im chun. Lc ny ti hp thoi xut hin 2 nhp liu: khong cch t mp tm n im chun th nht. Nhp s.

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khong cch t mp tm n im chun th hai. Nhp s. Cch chn im chun vn dng nt tng t nh trn.

3.2.2 CC LNH TO HNH TRN TM 3.2.2.1 Lnh Cut NGHA: Ct mt phn ca tm theo mt bin dng khp kn. DNG LNH: Thanh lnh: GII THCH: thc hin c lnh ny, trn mt ca tm phi c bin dng 2D khp kn.

Hp thoi xut hin:

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Tham s Extents - nh chiu su phn cn ct b Cch chn phng n v cho gi tr ging lnh Extrude ca phn to hnh khi c. Cut Across Bend ON (c nh d u) - cho php ct x uyn qua tm k c ch un cong, OFF (khng dnh du) - ch ct vi chiu su ng bng gi tr cho k t mt phng phc. Hnh a l l khot su bng na b dy. Hnh b, l khot su bng b dy tm ( Thickness) xuyn thng tm c xuyn qua on cong.

a

b

3.2.2.2 Lnh Flange NGHA: To thm mt tm phng ni vi tm c v to vi tm gc mt gc tu . DNG LNH: Thanh lnh: GII THCH: iu kin ca lnh ny l phi c mt tm c to trong bn thit k. Khng cn c bin dng. Hp thoi xut hin:

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Cch to tm ging nh to mt tm ni tip bng lnh Contoure Flange, ch khc l tm y l tm phng. Cc nt v thng s chnh: Edge: chn cnh tip gip (cnh pht trin tm mi). nh hng pht trin b dy (Thickness) ca tm. Distance: cho b rng tm. Xem hnh di. nh hng pht trin b rng tm. Hnh bn tri hoc chuyn hng nh hnh bn phi.

hoc Angle: gc to ra gia tm mi v tm c. G s.

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Bend Tangent to Side Face: nhn nt ny cung ln s tip tuyn vi mt mp tm c, ngc li, cung khng b rng buc.

Bend Radius: bn knh cung l n . Mc nh l bng gi tr BendRadius cho trong Style, nhng c th g s khc. Nhm Extents -> Type Tng t nh lnh Contoure Flange. Chng ta lun nh rng b dy (Thickness) tm v bn knh cung ln (Bend Radius) u c xc nh lnh Sheet Metal Styles.

3.2.2.3 Lnh Hem NGHA: To np gp theo mp tm. DNG LNH: Thanh lnh: GII THCH: Hp thoi xut hin:

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Cc thnh vin trong hp thoi: 1- Mc Shape - Cc tham s hnh dng ca np gp Type: kiu, nhn nt chn kiu, gm: np gp n. cun hnh git nc. Nu chn kiu ny, hp thoi nh sau:

Angle: gc gia phn cui ca mp v mt tm gc. G s. Gc ny phi > 90o.

Radius: bn knh cung ln. cun trn. Hp thoi gng nh Teardrop. Nguyn Vn Thip

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Angle: gc tm ca np cun. Gc ny phi < 360o. np gp kp. Hp thoi ging nh Single.

Nhm Shape - cc tham s hnh dng Nhn nt chn mp ca tm c cn to np gp.

trc.

chn hng pht trin ca np gp. Nhn nt Gap: khong h gia np gp v mt tm. Gi tr ny mc nh l mt cng thc: Thickess*0.5 (bng 0,5 ln b dy). Length: b rng mt np gp tnh t mp. Gi tr ny mc nh bng cng thc: Thickess*4 (bng 4 ln b dy). Cc gi tr ny c th thay i bng g s khc nhn nt hin ra cc bin s dt Nhn chn List Parameters: chn theo cc tham s ci t, mt danh sch hin ra:

C th ly cc tham s ny hoc thm mt php tnh vi n. Nhn hin thm nhm Extents -> Type tng t nh lnh Contoure Flange.

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2- Mc Unfold Options v Bend Relief Options c gii thch ti lnh Sheet Metal styles. Nhn Apply kt thc vic to np gp cho mt mp. C th tip tc vi mp khc. Nhn Ok kt thc lnh.

3.2.2.4 Lnh Fold NGHA: Un tm theo mt ng thng vch trn mt tm lm chun. DNG LNH: Thanh lnh: GII THCH: iu kin thc hin lnh ny l phi c ng thng v bng Line trong Sketch 2D trn mt tm. ng ny phi c hai u mt nm trn hai cnh mp ca tm (nu di vt qua hoc ngn khng chm ti cnh mp cng khng c dng lm ng gp).

Hp thoi xut hin:

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1- Mc Shape - To hnh dng phn b un Phn ny gm: chn ng chun. Nhn chn on thng v phc trn mt tm lm chun. chn phn cn un. Nhn tri chut nt ny, mi tn nm ngang ch phn cn un. chn hng un. Nhn chut i hng. Mi tn cong ch hng un.

nhn chn mt trong 3 nt ny nh v tr ca ng chun ti np gp.

Cc tham s khc: Bend Radius: bn knh cung ln. Cch nhp s liu ging nh cc lnh nu trn. Angle: gc to bi phn b gp v phn nguyn. 2- Mc Unfold Options v Bend Relief Options. c gii thch ti lnh Sheet Metal styles.

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AUTODESK INVENTOR - Chi tit dng tm Nhn Apply kt thc vic to mt ln gp. Nhn OK kt thc lun lnh.

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3.2.2.5 Lnh Corner Seam NGHA: Ni gc h gia hai mt phng ca chi tit. DNG LNH: Thanh lnh: GII THCH: Lnh ny ch thc hin c khi c hai mt phng ca tm to vi nhau mt gc nhng cn mt khong h nu ko di chng s chm nhau.

Hp thoi xut hin:

Nu nhn chn Corner Rip (x gc), lnh Seam khng thc hin.

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chn cnh mp. Nhn chut chn hai cnh ca cc mt t th c th ni c (hnh a). Nhn mt trong cc nt chn phng thc ni. Gap: khe h gia hai mt. G s. Khe h ny phi khc 0. Cc la chn ph xut hin nu nhn nt , gm: Extend Corner: Aligned: mt n s chiu xung mt kia. Perpendicular: hai mt c ko vung gc vi nhau. Nhn Apply thc hin lnh vi hai cnh chn.

Di y l hnh m t cc dng gc h khc nhau.

3.2.2.6 Lnh Bend NGHA: Ni hai mt ca chi tit dng tm bng cung ln. DNG LNH: Thanh lnh: GII THCH: Vi lnh ny chng ta xt cc trng hp: cung ln n (Bend) v cung l kp n (Double Bend). Tt nhin l Inventor rt thng minh nn t n nhn bit khi no th to cung

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ln n, khi no th to cung ln kp, chng ta ch cho cc tham s c hnh nh mun. 1- Cung ln n (Bend) Hai cnh song song nhau ca cc mt t th to vi nhau mt gc bt k v c th ni c, th cung ln c to ra l cung ln n. Hp thoi xut hin:

chn cnh mp. Nhn chn hai mp song song nhau ca hai mt. Lc ny ph n Double Bend b m i. Cc hnh di minh ho cc dng khc nhau ca cung ln n.

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2- Cung ln kp (Double Bend) Trng hp ny xy ra khi ta nhn chn hai cnh song song nhau ca cc mt song song. Lc ny phn Double Bend hin ln cc tham s chn nh hp thoi di y:

Chn mt trong 2 phng n sau: 90 Degree: 90 . To ra mt mt vung gc vi hai mt kia v to ra hai cung ln ni chng.

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Full Radius: to na vng trn ni hai mt.

chn mt lm chun. Mt no c chn lm chun cn chnh th khng b co gin. Unfold Options v Bend Relief Options c gii thch ti lnh Sheet Metal styles. Nhn Apply thc hin vic to cung ln.

3.2.2.7 Lnh Punch Tool NGHA: t hc trn tm. DNG LNH: Thanh lnh: GII THCH: Chc nng ny thc cht l dng cc iFeature (xem phn iFeatures v iParts) dng hc gn vo tm. Nh vy chng ta c th dng lnh to iFeature to ra cc hc theo mun. c im cc iFeature c dng trong lnh Punch l hc ny phi c to ra t cc hnh khi c nh v bng mt tm im.

Sau khi ra lnh, hp thoi xut hin: Nguyn Vn Thip

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Cc h chun ca Inventor l cc iFeature c t trong th mc Catalog -> c Punch. Nu chng ta c cc hc t to t th mc khc, c th nhn nt Browser ch ng n th mc . Dng chut chn tn hc trong danh sch bn tri hp thoi. bn phi t ng hin th hnh ca hc chn. Nhn Next sang bc tip theo. Hp thoi xut hin cho thng s, ng thi ti cc im trn mt tm cng xut hin cc hc vi kch thc nguyn thy.

Trong hp thoi bn tri c tham s: Centers: tm im. Tm c th l: - Cc im to bng lnh points trong 2D Sketch. - Tm ng trn hnh phc 2D. Angle: gc nghing ca hc so vi v tr nguyn thu. Nhn Next sang hp thoi th hai l cc thng s to ra hc (iFeature), chng ta c th thay i chng bng cch nhn chut vo tn thng s v g gi tr (nn km theo th nguyn nh mm hoc in). Nhn OK kt thc lnh, kt qu nh hnh di.

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3.2.2.8 Lnh Flat Patern NGHA: Trin khai cc tm c cc thnh phn khng cng nm trn mt mt phng thnh mt hnh phng. DNG LNH: Thanh lnh: GII THCH: Lnh ny gip cho nh thit k bit c tng kch thc mt tm vt liu cn c to ra tm c hnh khi nh thit k. V d ta c tm nh hnh a, sau khi ra lnh, lp tc ta c mt ca s biu din tm trin khai nh hnh b.

a X l hnh trin khai: Hnh trin khai c tn trong Trnh duyt l FlatPattern.

b

Tn hnh khai trin

Nhn phm phi chut vo tn FlatPattern, c trnh n ng hin ra: Extents: nhn tri chut, bng gi tr tng th ca hnh trin khai: Nguyn Vn Thip

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Gi tr ny khng th thay i ch xem bit, nhn Close kt thc. Show Window: cho hin ca s hnh trin khai. Close Window: ng ca s hnh trin khai tr li mn hnh thit k.

3.2.2.9 Cc lnh khc

Cc lnh chnh sa khc nh iFeature, Mirror, Hole, Corner Chamfer, Cornerr Round (Fillet)... trn thanh cng c Sheet Metal tng t nh i vi hnh khi khc.

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