TR U IN G DAI HQC SLT PHAM KY THU AT
THANH PHO HO CHI MINH
KHOA CO KHI CHE TAO MAY
BO MON CNCTM
DE THI CUOI HOC KY I NAM HOC 2023-2024
Mon: CONG NGHE CHE TAO MAY
Ma mon hoc: MMAT334225
Be so/Ma de: 01 Be thi co 03 trang.
Thai gian: 90 phut. Ngay thi: 18/12/2023
dirffc phep sir dung tai lieu (1 to* A4 viet tay).
Cau 1: ( 1 diem)
Trinh bay nhung yeu to lam anh hucmg den do chinh xac lap rap.
Cau 2: (1 diem)
Neu nhung yeu to de tinh lure kep can thiet.
Cau 3 : (2 diem)
Cho chi tiet, co cac yeu cau ky thuat nhu hinh ve.
Trong Nguyen cong khoan 16 d2. Biet be mat A, 16 di da gia cong.
a. hay Phan tich chon chuan dinh vi de dam bao tot nhat cac yeu cau ky thuat cua 16.
Neu ten chi tiet dinh vi se dung (theo phan tich da trinh bay).
b. Ve so do ga dat gia cong 16 d2. neu may dung de gia cong la 2H125
Cau 4: (2 diem)
Cho so d6 gia cong 2 lo , sir dung ddu khoan nhieu true (xem hinh ve trang sau)
a. Vi6t bieu thuc tinh lire kep c m thiSt Wet. bo qua lire dan h6i cua 16 xo, ma sat tai cac
cho t.
b. tinh lire kep c6n thiet Wet. Bi6t moment cat cua khoan la Mc=1390 Nmm. He so ma
sat la f=0.22. he s6 an toan K=1.8. B= 100 mm, d=20 mm.
So hieu: BM1/QT-PDT-RDTV/02 LSn soat xet: 02 Ngay hieu luc: 15/5/2020 Trang: 1/3
r \
c. cho ca cau kep nhir hinh ve. su dung no cho so do gia cong 6 cau a. Tinh Di, la dudng
kinh cua piston tac dong 1 chieu, biet ap suat hoi ep p=0.4 MPa. Hieu suat co khi
r|=0.85, 1=100 mm , 11= 150 mm ,a= 10° . bo qua luc dan hoi cua 16 xo, ma sat tai cac
chot.
Cau 5: (1.5 diem)
Cho chi tiet gia cong nhu hinh ve. A=100±0.11 ; B=45±0.125,
E=70hl3
Trinh tir gia cong cac 16 nhu sau: NCI gia cong khoan 16 D. NC2
gia cong khoan 2 16 d
a. neu dung chuan theo phuong an sau (xem hinh duoi) co dam
> r r
bao yeu cau gia cong khong ? chung minh. Neu Biet cac kich
thuoc cong nghe cua cac nguyen cong 1 va 2 la Ci=70hl3,
C2=25hl3
b. trong tru'dng hop chon chuan da neu tren, hay bien luan de xac dinh cac dung sai cua cac
kich thuoc lien quan de dam bao yeu cau gia cong la kinh te nhat. Neu nhan xet cua ban
Lira y. Trong gia cong co khi thong dung cap chinh xac su dung khong nho hon IT7
Cau 6 : (1.5 diem)
Cho chi tidt 1 (true), 2 (bac) nhu hinh ve. Yeu cau moi lap la dam bao khe hor S
voi Smax=0.24 mm, Smin=0.20 mm va dung sai moi ghep Ta=0.04 mm.
Kich thuoc cua chi tiet 1 la bU-o; 2 2 mm
Kich thuoc cua chi tiet 2 la 60+0,06 mm
a. Tai sao khong dung pp lap lan hoan toan voi cap chi tiet nay ?
So hieu: BM1/QT-PBT-RBTV/02 Lin soat xet: 02 Ngay hieu luc: 15/5/2020 Trang: 2/3
b. Neu dung pp lap chon theo nhom, hay xac dinh so nhom va klch thirdc tuong ung
trong tirng nhom. Chung minh rang cac nhom khi lap se su dung dupe pp lap lan hoan
toan.
Cau 7 : (1 diem)
Viet cong thuc tinh lupng du cho nguyen cong doa lo. Giai thich v6 dang cua cong thuc
Ghi chu: Can bo coi thi khong duac giai thich de thi.
Bang tra
Bang 1: T r j s o dung s a i (/mu)
Cap chinh xac 01 0 1 23 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Tren 3 0,3 0,5 0,8 1,2 2 3 4 6 10 14 25 40 60 100 140 250 400 600 1000 1400
Tren 3 den 6 0,4 0,6 1 1,5 2,5 4 5 8 12 18 30 48 75 120 180 300 480 750 1200 1800
" 6 " 10 0,4 0,6 1 1,5 2,5 4 6 9 15 22 36 58 90 150 220 360 580 900 1500 2200
?
E" 10 " 18 0,5 0,8 1,2 2 3 5 8 11 18 27 43 70 110 180 270 430 700 1100 1800 2700
1" 18 ” 30 0,6 1 1,5 2,5 46 9 13 21 33 52 84 130 210 330 520 840 1300 2100 3300
JS
JS " 30 " 50 0,6 1 1,5 2,5 4 7 11 16 25 39 62 100 160 250 390 620 1000 1600 2500 3900
u
u
M" 50 " 80 0,8 1,2 2 3 5 8 13 19 30 46 74 120 190 300 460 740 1200 1900 3000 4600
c
©" 80 " 120 1 1,5 2,5 4 6 10 15 22 35 54 87 140 220 350 540 870 1400 2200 3500 5400
2" 120 "1 80 1,2 2 3,5 5 8 12 18 25 40 63 100 160 250 400 630 1000 1600 2500 4000 6300
" 180 ” 250 2 3 4,5 7 10 14 20 29 46 72 115 185 290 460 720 1150 1850 2900 4600 7200
" 250 "315 2,5 468 12 16 23 32 52 81 130 210 320 520 810 1300 2100 3200 5200 8100
* 315 " 400 3 5 7 9 13 18 25 36 57 89 140 230 360 570 890 1400 2300 3600 5700 8900
" 400 " 500 4 6 8 10 15 20 27 40 63 97 155 250 400 630 970 1550 2500 4000 6300 9700
Chuan dau ra cua hoc phan (ve kien thuc)
------------------------------
>y
------------------
Noi dung kiem tra
[CLO!|: Thiet ke dirge quy trinh cong nghe gia cong chi tiet may Cau 5,3
[CL021:Phan tich, tinh toan dugc lugng du gia cong Cau 7
rCL03]:Tmh toan, thiet ke dugc do ga chuyen Cau 4,2
iCL04]: Lira chgn dugc phuong phap lap rap cac san pham co khi Cau 1,6
N gay 11 thang 12 n a m 2023
Trirong bo mon
n
So hieu: BM1/QT-PBT-RBTV/02 Lan soat xet: 02 Ngay hieu lire: 15/5/2020 Trang: 3/3
TR U IN G DAI HQC SU- PHAM KY THUAT
THANH PHO HO CHI MINH
KHOA CO KHI CHE TAO MAY
BO MON CNCTM
DAP AN (NGAY THI 18/12/2023)
DE THI CUOI HOC KY I NAM HOC 2023-2024
Mon: CNCTM
Cau
Cau 1
(ldiem )
Cau 2
(1 diem)
Cau 3
(2 diem)
a.
_______________________
Noi dung_______________________
1. B q chinh xac gia cong cua cac chi tiet may khong dam bao sai
so ve kich thuoc, hinh dang, vi tri tuong quan cua cac be m at
ban than chi tiet lap, chat luong be m at gia cong.
2. Do un g suat xuat hien trong qua trinh lap lam bien dang, gay
nen su dich chuyen vi tri giua cac chi tiet trong bo phan lap.
3. Thuc hien qua trinh lap va kiem tra khong dung quy trinh
_______
cong nghe lap rap
_________________________________________
- Phuong an dinh vi va chi tiet dung de dinh v i .
- Phuong chieu, diem dat lire kep (Wet).
- Phuong chieu, diem dat va gia tri cua luc cat.
- Trong luc, luc ly tarn, luc quan tinh neu co.
- Cac kich thuoc lien quan ve vi tri giua cac luc noi tren voi nhau
va voi do dinh vi.
________________________________________________
Cham theo trinh bay tren bai lam cua sinh vien
(0.5d) Vi du phan tic i: (cham theo bai lam cua sv)
Phuong
an
0.25d
Chi tiet dinh vi
Phien ti
Chot con di dong
Khoi V di dong
Phan tich 0.25d
Be mat
chuan
A_mat
phang
d l_ m a ttr y
trong
d4_ mat tru
ngoai
YCKT dam bao
Do vuong goc
Do doi xung
Diem Ghi chu
Bung 2/3
0.5dx2
Bung 4/5
0.25dx4
Chi tiet
dv phai
phu hop
voi chuan
da phan
tich
Cham theo trinh bay tren bai lam cua sinh vien
(hinh ve khong co duong tarn -0.25d)
Dinh vi 0.5d
Kep chat 0.5d
S va n 0.25d
Kich thuoc cong nghe, YCKT 0.25d