TRU ING DAI HOC SU- PHAM KY THUAT
THANH PHO HO CHI MINH
KHOA: CO K ffl CHE TAO MAY
BQ M 6N : C dN G NG H $ CHE T ^ O MAY
DE THI CUOI KY HQC KY 1
NAM HQC 2023-2024
Mon: May va thong Dieu khien so
MS mon hpc: MCNC340925
Be s6/Ma de: 01 Be thi co 2 trang.
Thai gian: 75 phut.
Khong du’Q’c phep sir dung tai lifu.
Cau 1: (3.5 diem)
a. Trinh bay each dieu chinh may va viet phuerng trinh de gia cong ren chinh xac. (2.0 diem)
b. Ap dung trong truong hap gia cong phan ren, cr chi tiSt nhu Hinh 2. Su dung bp banh rang thay
the bo 5 va ede banh rang dac biet (47, 97, 127, 157) (1.5 diem)
Cau 2: (3.5 diem)
Cho chi tiet nhu Hinh 2, biet rang cac be mat (l), (2), (3) (xem mat cat K -K) duac gia cong tren
may phay van nang P82 ket hap su dung dlu phan do co N = 40.
________
K - K
Hinh 2 - Chi tiet
a. Hay phan tich cau tao (duang sinh, ducmg chuln) cac be mat (l) , (2), (5) tren khi gia cong tren
cac thiet bi da cho. (1.0 diem)
b. Hay phan tich cac chuyen dpng tao hinh khi gia cong cac b6 mat tren. (1.5 diem)
So hieu: BM1/QT-PDT-RDTV/02 Lin soat xet: 02 Ngay hieu luc: 15/5/2020 Trang: 1/5
■
c. Tinh toan va dieu chinh tren dau phan dp de gia cong cac be mat tren. Chi su dyng banh rang
thay the trong bp 4 va cac hang 16 24, 25, 28, 30, 34, 37, 38, 39, 41, 42, 43. (1.0 diem)
Cau 3: (3 diem)
Gia sir be mat BC cua chi tiet H'inh 2 dupe gia cong tren may tipn NC sir dyng co cau npi suy phlin
cung 4 bit. De gia cong be mat BC dao can di chuy6n theo quy dao duong tron tam I voi ban kinh
RIO. Gia sir rang, goc tpa dp O (0,0) dupe dat trung tai diem B.
a. Hay ve cau true cua bp npi suy de gia cong BC nhu tren. (1.0 diem)
b. Gia sir rang BLU cua ban may la lmm/xung, hay:
• Xac dinh cac gia tri ban dau trong cac thanh ghi cua bp npi suy. (0.5 diem)
• Lap bang tinh toan cho cac buac npi suy. (1.0 diem)
• Ve hinh quy dao chay dao cho BC tren.
Chu y: He tpa dp ap dung cho cau 3 la Bxy, cac vj tri tpa dp diem nhu Hinh 2.
(0.5 diem)
Ghi chu: Can bo coi thi khong duac giai thich de thi.
Chuan dau ra cua hQC phan (ve kien thirc) Npi dung Idem tra
[CLOl]: Viet, giai thich cac phuong trinh xich truyen dpng va
tinh toan dieu chinh may cat kim loai
Cau 1
[ CL04]: Trinh bay cac chuyen dpng tao hinh cua cac loai may
cat kim loai. Tinh toan va dieu chinh may cat kim loai tuong ung
voi tung yeu cau cu the.
Cau 2
[CL04]: Lap trinh, tinh toan noi suy cho cac duong chay dao cho
giai thuat npi suy phan cung.
Cau 3
N gay 11 thang 12 nam 2023
S6 hieu: BM1/QT-PDT-RDTV/02 LSn soat xet: 02 Ngay hipu lyc: 15/5/2020 Trang: 2/5
DAP AN:
Cau 1: (5.5 diem)
a. Trinh bay each dieu chinh may va viet phuong trinh de gia cong ren chinh xac. (2.0 diem)
Be gia cong ren chinh xac tren may tipn 1K62, dong (noi) cac ly hpp L2, L4, L5 lai dS dudng
truyen tu true chinh (VI) den true vit-me (tx= 12) hinh thanh nhu sau:
Tryc VI -> tryc VII -> tryc VIII -> bp banh rang thay the -> tryc IX -> L2 -> tryc X L4-> tryc XIV
L5 -> tryc XV. (1.0 diem)
Phuong trinh xich cSt ren chinh xac:
1 vtcX^(VII)X
42
42
28
56
35 28
28 * 35
(VIII) (IX) x 12 = tp(m m)
(1.0 diem)
(1)
b. Ap dung trong trudng hpp gia cong phan ren, d chi tiSt nhu Hinh 2. Su dung bp banh rang thay
the bp 5 va cac banh rang d$c bipt (47, 97, 127, 157) (1.5 diem)
Phan ren d Hinh 2 c6 bude ren tp = 1.75 mm. Ta thay tp = 1.75 mm vao cong thuc so (1) va chpn ti
f y 28
so truyen tu true (VII) -> true (VIII) la—thi ta dirge:
56
Ivtc X % <yit) X f (VIII) x f . J (IX) x 12 = 1.75 (mm)
Hay
a c 1.75 _ 7 _ 7 1 _ 35 40
b 'd ~ ~ 6 ~ ~ 24 “ 12 X 2 ~ 60 X 80
Vay ta can lap 4 banh rang thay the (a, b, c, d) lan liro-t la 35, 60, 40, 80
Thoa dieu kien lap: fa + b > c + 15-4-20N
\c + d > b + 15 + 20J
Chu y: Sinh vien chpn ti so truyen tir true VII -> VIII va bo banh rang thay the khac neu thoa cong
thuc (1) van dup e tinh diem.
Cau 2: (3.5 diem)
a. Hay phan tich cau tao (dudng sinh, dudng chuln) cac be mat (I), © , (5) tren khi gia cong tren
cac thilt bi da cho. (1.0 diem)
Khi gia cong cac be mat (l) , (2), (§) tren may phay van nang n hu da cho thi be mat chi tiet du pe
hinh thanh bdi: Dudng sinh - dudng gap khuc ( |_|) co klch thude 3.5><4.5 mm nhu Hinh 2. b.
Dudng chuan - dudng thang song song vdi dudng tam chi tiet nhu Hinh 2. a.
S6 hieu: BM1/QT-PDT-RDTV/02 LSn soat xet: 02 Ngay hi?u lyre: 15/5/2020 Trang: 3/5
I
b. Hay phan tich cac chuyen dpng tao hinh khi gia cong cac be mat tren. (1.5 diem)
Khi gia cong cac be mat (T), (2), @ tren may phay van nang nhir da cho thi cac chuyen dong can
thiet nhir sau:
Chuyen dong cat chfnh - dao quay tron - tao ra dirong sinh
Chuyen dong chay dao - ban may mang phoi tinh tien - tao ra du-ong chuan
Chuyen dong phan do - de phoi quay tir be mat (T) sang be mat (2) va den be mat (3)
c. Tinh toan va dieu chinh tren dau phan do de gia cong cac be mat tren. Chi svr dpng b&nh rang
thay the trong bp 4 va cac hang lo 24, 25, 28, 30, 34, 37, 38, 39, 41, 42, 43. (1.0 diem)
Sau khi gia cong be mat (T), ta su- dung dau phan do de tao ra chuyen dong phan do giup
quay chi tiet mot goc 45° de den gia cong be mat (2). Tiep den, ta phai quay chi tiet mot goc 61°
(90°-29°) de gia cong be mat (3). Nhir vay ta phSi tien hanh 2 lan phan do.
(y lan phan do thu- nhat, ta co:
nt,i =T1 = Nxl ^ =40xi& = T =S (v6n9) (°-5 ^iem)
Va 6- lan phan do thu- hai, ta c6:
N
n tq
2 = — = NX- 610 61C 61
Z2 ' " 360°
Vi khong co hang lo phu hop nen ta tien hanh chia vi-sai:
= 40xW = T (vi,n« )
66°
360°
B 1: Chon Zx ~ Z2 =
Tac6 ntq2 = ^ = W x ^ = 40 x ^ = f = 7 + 1 = 7 4 - ^ (vbn5 )
B2: Tinh a, b, c, d
a c ( Z2\ ( 61\ 5 5 20 100 80
- x - = / V x ( l —— = 4 0 x (l - — ) = 40 x — = - x — = —— x —
b d \ Zx) \ 66/ 66 3 11 60 44
Nhu- vay 6 lan phan do thu- hai, ta can lap bo banh rang thay the ^ x ^ x va quay dau
phan do 7 vong va 8 lo tren hang lo 24. (0.5 diem)
Cau 3: (3 diem)
a. Hay ve cau true cua bp npi suy de gia cong BC nhu tren. (1.0 diem)
Gia cong cung tron BC sir dung bp noi suy lo^i 2 co cau true nhu sau
S6 hieu: BM1/QT-PDT-RBTV/02 Lan soat xet: 02 Ngay hipu lpc: 15/5/2020 Trang: 4/5
b. Gia su r&ng BLU cua ban may la lmm/xung, hay:
• Xac dinh cac gia tri ban dau trong cac thanh ghi cua bp npi suy.
Px =Rcos(a)
Py =Rsin(a)
Pxo — 10 ; Pxo = 0
PyO = 0 ; PyO = 0
• Lap bang tinh toan cho cac buac npi suy.
TT Px q x AZx ZZx Py QY AZy ZZy
0 10 0 0 0 0 00 0
1 10 10 0 0 0 0 0 0
2 10 4 1 1 1 1 0 0
310 14 0 1 1 2 0 0
4 10 8 1 2 2 4 O 0
5 10 2 1 3 3 7 0 0
6 10 12 0 3 3 10 0 0
710 6 1 4 4 14 0 0
8 10 0 1 5 5 3 1 1
9 9 9 0 5 5 8 0 1
10 9 2 1 6 6 14 0 1
11 9 11 0 6 64 1 2
12 8 3 1 7 7 11 0 2
13 8 11 0 7 7 2 1 3
14 7 2 1 8 8 10 0 3
15 7 9 0 8 8 2 1 4
(0.5 diem)
(1.0 diem)
• Ve hinh quy dao chay dao cho BC tren. (0.5 diem)
So hieu: BM1/QT-PBT-RBTV/02 Lan soat xet: 02 Ngay hipu lire: 15/5/2020 Trang: 5/5