quy trình thiết kế và chế tạo khuôn Ép nhựa.pptx

CC CH THIT K SN PHM TRONG CNG NGH P PHUN

CC CH THIT K SN PHM TRONG CNG NGH P PHUN

TRNG H S PHM K THUT HCMKHOA O TO CHT LNG CAO

QUY TRNH THIT K KHUN P NHA

BO CO

GVHD:Ths. TRN MINH TH UYN SVTH : L VN TI MSSV:11144168

QUY TRNH THIT K KHUN P NHABN V THIT KTHIT K SN PHM V KHUNN T HNG

ZC TNH ,CHN VT LIU, LP RP

N T HNGNhu cu ca con ngi s lng nhiu hay t Quyt nh cch sn xut

I.THIT K SN PHM V KHUN

1.GC THOT KHUN i vi sn phm c gn, vu li, rnh su hay c b mt vt ta nn thit k gc vt theo hng m ca khun sn phm c th thot khi khun 1 cch d dng.Chi tit khng gc vt Chi tit c gc vt

Saing

Saing

Saing

th gip thit k gc vt cho ph hp.2.B DYa.Hiu qu thit k: Rt ngn thi gian chu k p phun v ch to khun Gim gi thnh sn phm v khun Tit kim vt liu m vn hiu qu Trnh cong vnh, l kh, vt lm, ng hn

y l cc khuyt tt thng gp khi thit k b dy sn phm khng ph hp

Nu phn vt liu bn trong li sn phm ngui chm hn vt liu bn trn b mt, s to ra s co rt khng ng u sn phm. S co rt ny s gy ra cng vnh sn phmSn phm b cng vnh

3.GC BOa.Hiu qu thit k: Sn phm c lm ngui ng u Gim kh nng sn phm b cong vnh Gim s cn dng Gim s tp trung ng sut Nha lng d in y lng khun

Qu mngQu dy

Cc khuyt tt thng gp phi:

Hnh (a) l vt nt.Hnh(b) l vt kha hnh.Hnh (c) l np gp b mt.

4.GNThit k sao cho b dy sn phm cng mng cng tt. ( cng vng tng khi khong cch gn gim li)B dy, gc cn, cao lin quan n nhau, nu b dy gn qu ln dn n vch lm v gc cn qu ln s kh khn in y khun nghing mi bn khong 10, b dy y gn max l 0.8 dy sn phm ni t gn (0.5-0.8)Gn tng bn phi nm thng hng vi hng m khun

Cc gn nn t dc theo 1 hng t cng vng tt (nn t dc).

Cc kiu t gn

5.VU LICc vu li thng dng bt vt hay cc cht bt vt li vi nhau.B dy ca vu nn nh hn 75% b dy t vu, khi b dy vu vt qu 50% d a n cc vt lm trn b mt v ng sut tp trung tng.

Hnh trn l cc thng s thit k vu li

6.L TRN SN PHMa.L khng sut Chiu su ca l thng khng vt qu 3 ln ng knh l. i vi cc l c ng knh nh hn 5mm th t l ny l 2. B dy ca phn vt liu di cng nn ln hn 20% ng knh l loi tr khuyt tt cho mt i din.

Cc thng s thit k l khng sut

b.L sut Khong cch gia 2 l hoc gia cc l vi mp ngoi ca sn phm nn bng 2 ln b dy hay bng 2 ln kch thc ln nht c o theo chu vi ca l.

Cc thng s thit k l sut

7.THIT K SN PHM C RENa.bin dng ren

Ren phi tiu chund.Mt s yu cu cn ch : Bn knh nh ren v chn ren nn rt ln nht c th trnh s tp trung ng sut. on cui ren nn lm trn trnh tun ren, h ren.

To ng trn cui cng ca ren

8.UNDERCUT Undercut l phn trn sn phm gay ra kh khn khi tch khun, nh l ngang trn sn phm, hay l nhng l song song vi mt phn khun. to c nhng l nh th ny chng ta phi t li v khi tch khun ly sn phm ta phi rt li trc ri mi tch khun ly sn phm.V d: Ban u khng th tho sn phm ra khi khun

Sn phm sao khi thit k li c th tho sn phm ra khi khun

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