TRUING DAI HOC SU' PHAM KY THUAT
t h An h PHO HO CHI MINH
K H OA CO K H I CHE TA O M A Y
BO M O N CN C TM
DE TH I C UO I HO C KY I N A M H OC 2023-2024
M on: CONG NGHE CHE TAO M AY
Ma mon hoc: MMAT334225
B e so/M a de: 01 B e thi co 03 trang.
Thai gian: 90 phut. Ngay thi: 25/12/2023
dupe phep sir dung tai lieu (1 to1 A 4 viet tay).
Cau 1: (1 diem)
Voi chi tiet dang hop, bien phap gia cong cac 16 chinh (lo lap ghep vdng hi) cua hop co the gia
cong tren mot so loai may cong cu, nhirng du gia cong 16 tren loai may nao chang nua, thi:
a. Duong kinh cac 16 phu thuoc co ban vao cac yeu to nao?
b. Do chinh xac ve khoang each tarn, do song song hay vuong goc giua duong tarn cac 16 voi
nhau cung nhu cac yeu cau ve vi tri khac cua 16 duoc bao dam bang cac phuong phap nao?
Cau 2 : (1.5 diem)
Cho chi tiet, yeu cau khoan 16 0 2 OH 13, cac be mat con lai tren
chi tiet da gia cong. May dung de gia cong la 2H125
Hay Phan tich chon chuan dinh vi de sai so ga dat la nho nhat.
Ve so do ga dat gia cong khoan 16 (theo phan tich 6 tren).
Chung minh rang trong so do ga dat nay, sai so ga dat la nho
nhat. xem sai so do ga la 1 hang so.
Cau 3: (1.5 diem)
9 r r r r
Hay cho biet, chi tiet va co cau dinh vi chinh la gi? Chi tiet va
co cau dinh vi phu la gi? Khi su dung co cau dinh vi phu can quan tarn den cac dieu gi? Cac chi
tiet va co cau dinh vi can phai dam bao cac yeu cau gi?
Cau 4 : (1 diem)
Luong du trang gian la gi? Cho biet cong thuc tinh lupng du nay Zbmin = Rza + p« + Zb su
dung trong cac truong hop nao ? Tai sao?
Cau 5: (2 diem)
Tren may khoan dung 2H135, tien hanh khoan 16 suot co duong kinh d (xem hinh ve)
A1
So hieu: BM1/QT-PBT-RBTV/02 Lan soat xet: 02 Ngay hieu lire: 15/5/2020 Trang: 1/3
a. Tinh lire kep can thiet Wet. Biet moment cat cua khoan la Mc=2500 Nmm. He so ma sat la
f=0.22, a=50 mm, he so an toan K=1.8, bo qua tac dung cua lire Po.
b. Cho co cau kep nhu hinh ve. (Bo qua ma sat tai cac ch6t) su dung no cho so do gia cong b cau
a. Hay viet bleu thuc tinh D l, la dubng kinh cua piston tac dong 1 chieu, biet 1=100 mm,
11=150 mm, b trang thai kep goc ABC=90°, a= 10°. ap suat hoi ep p, p=0.4 MPa. Hieu suat co
khi ri=0.85, bo qua luc dan hoi cua lb xo.
Cau 6 : (1.5 diem)
Cho chi tiet 1 (true), 2 (bac) nhu hinh ve. Yeu cau moi lap la dam bao khe
hb S trong moi ghep: Smax=0.26, Smin=0.22 va dung sai moi ghep t
Ta=0.04.
Kich thubc cua chi tiet 1 la 5°-o!22
Kich thubc cua chi tiet 2 la 50+0 06
a. Tai sao khong dung pp lap lan hoan toan vbi cap chi tiet nay ?
b. Neu lap chon theo nhom, thi can chia lam bao nhieu nhom? Chung minh rang trong tirng nhom
da chia se dung duqc pp lap lan.
Cho so do ga dat gia cong mat phang M nhu hinh ve, tren may
phay dung 6H11. Can dam bao kich thubc A=30+013. Chuan dinh vi
dung la mat phang_3 bac dinh vi. Lo_2 bac dinh vi, chon dung chot
tru 025h7
a. Neu 16 025 duoc gia cong vbi kich thubc 025H1O, thi co dam
bao ve yeu cau ga dat theo phuong an nhu hinh ben khong? Biet
sai so chuan cho phep ^ 3 ^ .
b. Xac dinh dung sai kinh te nhat (cap chinh xac kinh te nhat) khi
gia cong 16 dinh vi 025 de dam bao ve yeu cau ga dat.
c. Neu ten chi tiet dinh vi de trong trubng hop nay sai so chuan = 0.
Cau 7 : (1.5 diem)
+0.13
30°
A A * A
Ghi chu: Can bo coi thi khong duac giai thich de thi.
So hieu: BM1/QT-PBT-RBTV/02 Lan soat xet: 02 Ngay hieu luc: 15/5/2020 Trang: 2/3
Bang 1: Tri so dung sai (pan)
Csip chtnh xac 01 0 1 2 3 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 46 10 14 25 40 60 100 140 250 400 600 1000 1400
T ren 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
" 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
" 18 " 30 0,6 11,5 2,5 4 6 9 13 21 33 52 84 130 210 330 520 840 1300 2100 3300
" 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
" 50 " 80 0,8 1,2 2 3 5 8 13 19 30 46 74 120 190 300 460 740 1200 1900 3000 4600
" 80 " 120 1 1,5 2,5 46 10 15 22 35 54 87 140 220 350 540 870 1400 2200 3500 5400
" 120 "1 8 0 1,2 2 3,5 5 8 12 18 25 40 63 100 160 250 400 630 1000 1600 2500 4000 6300
" 180 " 2 5 0 2 3 4,5 7 10 14 20 29 46 72 115 185 290 460 720 1150 1850 2900 4600 7200
" 250 "3 1 5 2,5 4 6 8 12 16 23 32 52 81 130 210 320 520 810 1300 2100 3200 5200 8100
" 315 "4 0 0 3 5 7 9 13 18 25 36 57 89 140 230 360 570 890 1400 2300 3600 5700 8900
" 400 "5 0 0 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)
---------------------
?
-------------
Noi dung kiem tra
fCLOll: Thiet ke dugc quy trinh cong nghe gia cong chi tiet may Cau 1,2,7
fCL02]:Phan tich, tinh toan dugc lugng du gia cong Cau 4
[CLQ31:Tinh toan, thi§t ke dugc do ga chuyen Cau 3,5
fCL041: Lua chgn dugc phuong phap lap rap cac san pham co khi Cau 6
Ngay 22 thang 12 nam2023
J B , T riro n g b o m o n
So hieu: BM1/QT-PDT-RDTV/02 L£n soat xet: 02 Ngay hieu luc: 15/5/2020 Trang: 3/3
TRUtJNG DAI HQC SU PHAM KY THU AT
t h An h PHO HO CHI MINH
KHOA CO KHI CHE TAO M AY
BO M ON CNCTM
DAP AN (N G AY THI 2^/12/2023)
DE THI CUOI HOC KY I N A M HOC 2023-2024
• •
Mon: CNCTM
Cau
Cau I
(ldilm)
a.
(0.5d)
Noi dung
Duong kinh cac 16 phu thuoc ca ban vao:
- Kich thuac cua dao
- Viec dieu chinh kich thuac cua mui dao lap tren true dao
Diem Ghi chu
0.5d Dung 1/2
b.
(0.5d)
1.
2.
Gia cong lo theo he thong bac dan huang tren do ga
Gia cong 16 theo phuang phap xac dinh vi tri bang tga do nhadu
f i i hay nha P
0.5d Dung 1/2
Cau 2
(1.5 d)
A1
Ay
020
1
"n<
le l+ £ l+ sl+ s2m+ si
£gd ~ "I6
Trong cung 1 dieu kien thi cac sai so
£k> £ct> £m> £dc khong doi
Vay m in(£qd) khi ec = 0
Chuin dinh vi: Mat 1 va 2 0.25d
(Cham theo trinh bay cua sinh vien, co bien luan
£c = Ova chon mat 1 va 2 lam chuan thi 0.25d, phai co ket luan hoac hinh ve
____________________
chi ra mat 1 va 2 lam edv)
____________________
Cham theo trinh bay tren bai lam cua sinh vien
Dinh vi 0.25d
Kep chat 0.25d
S van 0.25d
Kich thuac cong nghe, YCKT 0.25d
Id
Chimg minh rang trong sa do ga dat nay, sai so ga dat la nho nhat. xem sai so
do ga la 1 hang so?
Bien luan chi ra sai so chuan bang 0 thi sai so ga dat la nho nhat
(Cham theo trinh bay tren bai lam cua sinh vien)
0.25d
Cau 3
(1.5 d)
Chi tiet dinh vi chinh la nhung chi tiet co the khong che dugc mot so
hoac toan bo bac tu do cua chi tiet gia cong 0.5d
Co cau dinh vi phu (ccdvp) la nhung ca cau dung de tang them do cung
vung cua chi tiet gia cong ma khong co tac dung khong che bac tu do. 0.25d
Khi su dung, can quan tarn den: 0.25d
1. Ccdvp khong dugc lam thay doi vi tri chi tiet gia cong da dugc Dung
xac dinh 1/2
2. Khong nen qua nhieu lam cho do ga cong kenh phiic tap.
Cac chi tiet va ca cau djnh vj yeu cau che tao chinh xac, bao dam do
ciing va do chong mon cao, de thay the khi bi hu hong. 0.5d
Luang du trung gian (ky hieu la Zb) la 16'p kim loai dugc hat di a moi
buac cong nghe hoac moi nguyen cong.
__________________________
0.25d
Cau 4
(id)
Cong thiic tinh luong du nay Zb min = R za + p a + Sb su dung
rong cac trudng hap:
Truong hap su dung
1. Gia cong mat
phang_______
2. Sau nguyen
cong thu nhat
doi vai cac chi
tiet lam bang
gang hay kim
loai mau
3. Sau nhiet luyen
ma dem mai
Diem
(0.5d
Dung 2/3)
Giai thich
Lap kim loai
hong tao nen
la do bien
dang deo
khong dang
ke
Lap kim loai
dugc lam
ciing do nhiet
luyen, do la
lap kim loai
can thiet khi
su dung
_____
Diem
0.25d
Dung 1/2
0.75d
Cau 5
(2d)
a.
(1.5d)
Wct.f.a = K.Mc
W.„ = K M <
f-a
K6t qua: Wet = = 40 9 ,1 N (0.5d)
M 0,22.5 0 v '
1.5d
(id)
Sai hoac
thieu dan
vi tru 0.25d
Q = R c o s ( a );
\ t
Phuang trinh can bang Momen tai B:
Wet. I = R C05(a)Z1
+ R sin( a)lx tan( a)
_ W c t . l , N
Q —
------
.cos(a)
D 1 = 2 W c t.l .c o s ( a ) (0.25d) 0.5d
I n-.p.Tj.ti
D1 = 31,5m m (0.25d)
(sai dan
vi -
0.25d)