NGHIEN cflu TRAO D6\
NGHIEN CLTU TAO L A P HE CAP CHO NHOM CHI TIET Cd KHI DIEN HINH
ThS. VUOng Si Kdng'; PGS.TS. Trdin Xudn VietS TS. Nguyin Trong DoanhS 'TrUdng Dai hoc SU pham Ky thuat HUng Yin, ^Trildng Dai hoc Bdeh khoa Hd Ndi
TOM TAT
Tu dgng hda thiit ki cdng nghe cd khi mang lai nhieu Uu diem vd se mang lai hieu qud cao. Tuy nhien, rdt kho de mgt sdn pham cd khi ra ddi md qud trinh hinh thdnh cua nd dUdc tU dgng hodn todn.
Qud trinh tit dgng hda chi dUdc thiic hien d mgt hodc mgt vdi khau ndg dg trong todn bg cdc khdu deed dUdc mgt sdn pham hodn chinh. Dd la ly do cho viec tao lap cdc he CAP (Computer Aided Planning) rieng le. Cdc he CAP ndy dUdc tao ra vdi muc dich ho trd cho viec tinh todn, thiit ki, sdn xudt cdc sdn pham cd khi dUdc nhanh chong vd chinh xdc. Qua dd md tUng bade ndng cao ndng liic canh tranh cita sdn pham.
Trong bdi bdo ndy gidi thieu viec nghien cUu vd tao lap he CAP cho nhom chi tiet dgng cdng.
TU khoa: CAP- Computer Aided Planning. Ta dgng hda thiit kiquy trinh cong nghe.
ABSTRACT
Automation mechanical design technology brings many advantages and gives high efficiency.
However, it is difficult for a mechanical product that was born of its formation process is completely automatic. Process automation is only done in one or a few stages that in all the stages to get a complete product. That is the reason for creating the CAP system (Computer Aided Planning) separately The CAP system is created for the purpose of calculating support, design and production of mechanical products are fast and accurate. Thereby gradually improving the competitiveness of the product. This paper introduces
the research and create CAP systems for mechanical connecting parts.
Keywords: CAP- Computer Aided Planning. Automation technology design process.
Jl^ TAP CHi CO KHi VI$T NAM • Sd 4 (Thang 4 nam 2012)
NGHIEN ClJfU-TRA0D6l
I.DATVANDE 28,GX21-44.
Cdng la loai chi tiet khdng trdn, ed hinh thanh det, thfldng ed mdt hodc mdt so lo ca bdn can dfldc gia cdng chinh xdc cao. Cdc 16 nay cd quan he vdi nhau v l dp song song, dp vudng goc hay dfldi mdt gdc nao dd, cac Id nay cung ed quan he v l vi tri cdc dfldng tam Id so vdi mat dau ciia n d Ngoai nhflng 16 eP ban, tren cdng cdn cd nhflng Id dung d l kep chat, cdc rdnh then, cdc mat ddu va nhflng yeu td khac can dflpc gia cdng.
Chi tilt dang cang thfldng co chfle nang la cau ndi gifla chi tilt nay vdi chi tilt khac (con- necting parts) de bien ddi chuyen ddng, vi du nhfl tay bien eua ddng ca ddt trong ndi piston va true khuyu (hinh 1.1). Nd cung dung d l gat cac chi tilt khac din mdt vi tri nhat dinh, vi du nhfl la cang gat eua hop sd de banh rang an khdp (hinh 1.2).
Hinh 1.1
rtXEan
Hinh 1.2
De che tao ra chi tilt dang cang phdi trai qua rat nhilu cdng doan trong he thong cdng nghe: mdy, ga, dao (dung cu cat), phdi. Trong do, viec Ifla chon may vd dung cu eat d l tao hinh chi tilt rat phflc tap, doi hdi tinh todn chinh xdc. ti mi va tdn nhilu thdi gian (dl dfla ra che dp cat kinh te). Nlu qua trinh nay dflpc tfl dpng hda (nhd trp giup cua may tinh) thi se mang lai nhieu lpi ich. Do dd, vile tao lap he CAP cho nhom chi tiet dang cang la thilt thflc va thflc sfl cd y nghia khoa hpc va thflc tien.
2. P H U O N G PHAP TIEN H A N H
Khi tao hinh chi tilt ca khi nhat thilt phai trdi qua giai doan gia cong ca cae be mat. Chi tilt cang phflc tap thi sd nguyin cdng cang nhilu va chi phi thdi gian cung nhfl cdng sfle cho viec tinh toan chi dp cat, chpn may, chpn dao cang ldn. Nlu nhfl chi tilt phai trai qua nhieu phflong phdp tao hinh b l mat khac nhau (tien, phay, bao, khoan,...) thi viec chpn lfla mdy, dao va tinh todn che dp cat hpp Iy la van de hit sfle phflc tap.
Gia sfl b l mat chi tilt dang cdng dflpc tao hinh bang phflong phap phay. Khi dd tdc dp cat V dflpc tinh theo cdng thflc (m/ph):
C,.D'
f" .t\s: .B" z".
-.K^ (2.1)Tri s6 lflc vdng (lflc eat) PZ khi phay dflpc tinh theo cdng thflc (N):
10.C.,f\5;-B".Z (2.2)
Cdng suat cdt duoc tinh theo cdng thiic (KW):
Vat lieu de c h i tao chi tiet dang cdng la thep cacbon kit cdu C20, C35, C45, thep hop kim WCrNl,... Mot sd diidc lam til gang xam GX12-
"1020.60
(2.3)
TAP CHI CO KHl VIETNAM • Sd 4 (Thing 4 nam 2012)
NGHIEN CJU - TRAO D 6 |
De dang nhdn thay cong suat eat Id mpt ham phu thudc rat nhilu bien:N = f(D, t, S , (2.4)
Cung vdi he cP sd dfl lieu vd ngdn ngfl I^p trinh phu hpp da tao ra he CAP tinh todn che dp cdt cho nhdm chi tilt dang cang. Dfldi day Id kit qud tinh toan cho chi tilt hinh 1.2 (hinh 3.2):
Va dieu kien quan trpng d day Id:
N^,<N„.-1 (2.5) N_^,il Ian Iflpt Id cdng suat va hi|u suat cua
mdy gia cdng.
Nlu bilu thflc (2.5) khdng dflpc thda mdn thi che dp cdt (vd cdc thdng sd da Ifla chpn) trd nen vd nghia.
Do dd, cdc thdng sd cdng ngh? trong nguyen cdng dflpc tfl dpng thiet lap thi nd se ludn thda mdn dflpc bilu thflc (2.5).
Cdch Idm ndy cung dung cho cdc phflpng phap tao hinh khdc.
3. XAY DlTNG THUAT TOAN VA C H U O N G TRiNH
Dl eac thdng sd cdng nghe (mdy, dao, che dp cat) dflpc tfl ddng thilt lap ddi hdi phdi cd he ca sd dfl heu du ldn vd cdc thuat toan phu hpp vdi chflpng trinh- Dfldi ddy Id lflu do thuat toan cua he CAP nhdm chi tilt dang cang (hinh 3.1):
1 '•!*. i . P - 1 l-"'jJSi"
Hinh 3.2 4. KET LUAN
Cac he CAP dflpc tao ra vdi muc dich hd trp cho vile tinh toan, thilt ke, sdn xuat cdc san pham cd khi dflpc nhanh chdng va chinh xdc. De thilt lap cdc he nay can phdi ndm dflpc dac diem chung cua hp chi tilt, vat lieu, kit cau cdng nghe. Phai cd cd sd dfl lieu va thuat giai phu hdp vdi cdc quy luat Idgic vl ky thuat cua qua trinh cdng nghe. ***
Tai lieu tham khao:
Hinh 3.1
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Cing-Bifin, D31 hpc Sif ph^m Ky thuat HUng Ytn.
17]. Hyun Chan Lee, Won Chul Jhee, Hee-Sok Park (2007), Genera- tive CAPP through projective feature recognition. Hong-ik Univer- sity, Republic of Korea
(8]. Liu Mma, Bai Lib, Zhang Shenshengc (2002). Modeling integrat- ed CAPP/PPS systems. Software Department, Zhejiang University, 191. Q. Peng, FR. Hall, P.M. Lister (2006), ^plication and evaluation of VR-based CAPP system. University of Wolverfiampton. Wolver- hampton WVllSB. UK.
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TAP CHl CO KHf VIET NAM • S6 4 (Thang 4 nam 2012)