\l GIA CONG BANH RANG TREN MAY PHAY LAN RANG THEO PHU'aNG PHAP DIEU CHJNH KHONG VI SAI
VA U'NG DUNG MAY
T I N HTRONG
T I N HTOAN DIEU CHiNH
HOBBING HELICAL GEARS WITH NON-DIFFERENTL\L SETUP AND COMPUTER-AIDED CALCULATION OF ITS SETING UP PARAMETERS
Duong Cfing Dinh
Khoa Co khf, Tniong Dai hoc Ky thuat C5ng nghiep, Bai hoc Thai Nguyen TOM TAT
Khi gia cong bdnh rdng tru rdng nghieng tren mdy phay ldn rdng co the dimg hai phuang phdp Id dieu chinh vi sai vd dieu chinh khong vi sai. Phucmgphdp dieu chinh vi sai thudng duac su dung han do co nhieu thudn lai trong dieu chinh vd van hdnh. Phuangphdp dieu chlnh khong vi sai duac sir dung khi gia cong tren cdc mdy khong co ca cdu cong cUng nhu cd the ndng cao duac do chinh xdc gia cong do xich dong hoc cung vitng han. Tuy nhien, trong tinh todn dieu chinh va van hdnh mdy co phitc tap han so vai phuang phdp dieu chinh vi sal Bdi bdo ndy, trinh bdy phucmg dn sit dung mdy tinh de lap trinh tinh todn tu dong trong tinh todn dieu chinh dong hoc mdy theo phuangphdp dieu chinh khong vi sai de ndng cao do chinh xdc gia cong. Sdnphdm gia cong iheo phuang dn tren duac kiem lgi bdng mdy do chuyen ditng.
Tir khoa: Bdnh rdng tru rdng nghieng, dieu chinh khong vi sai, hdnh rdng thay thi, chuang trinh, ca cdu vi sai, tinh todn dieu chinh.
For manufacturing helical gears on a hobbing machine, differential and non-c setup methods can be used. The former choice is usually preferred due to its simplification i, setting-up and implementation. The non-differential setup method is applicable to gear hobbing without a differential mechanism. It can also be used for increasing machining precision due to the fact that the kinematic chain is more rigid than the differential method. However, its calculation for setting up the hobbing machine is more complicated than the differential one. This paper, therefore, presents a computational method, with computer-aided calculation for non-differential setups, to automatically calculate setting-up parameters on the hobbing machine for increasing machining precision. Produced helical gears with the presented method are measured using high precision
measuring instruments for validation.
Keywords: Helical gears, non-differential setup, change gears, programming, differential mechanism, calculation of setup parameters.
ISSN 0866-7056
TAP CHl CO KHf VIET NAM, S6 10nam2015 www.cokhivietnam.vn
NGHIEN cufu - TRAO DOI
1. DIEU CHINH DONG HQC XICH P H A N DO KHI GIA CONG BANH RANG TRU RANG NGHIENG THEO PHirONG PHAP DIEU CHINH KHONG VI SAI
Khi gia cong bdnh rang tru rang nghieng theo phuong phap diSu chinh khong vi sai (so do c&u tnic dpng may nhu hinh 1) thi c6ng thuc difiu chinh dong hpc ciia xich phan dp theo cong thuc (1).
i=C.—.-^—
Z T±S Trong do:
C: HSng sfi ctia xich dpng hoc.
K: S6 diu m6i cua dao phay true vit.
Z: S6 rang cua banh rang gia cong.
S: Lugmg chay dao diing.
T: Chigu dai buoc xoin duong rang.
%
(1)
C.K.Jt.m„ ,-,
i.= " \V
7t.m„.Z±S.&mp
Sai s6 cho phep cua ty so truydn xac dinh theo sai s6 goc ngliieng dp ciia banh rang:
dx _ Sdp.cosp (', !t.m„.Z + S.sin fl (4)
Ty s6 tmygn cua xich phan d6 dupc dieu chinh bang co cau banh rang tliay the:
a c (5)
Trong do: a,b,c,d: la so rang cua cac banh rang thay the.
Dg dam sai s6 goc nghigng dp ciia banh rang thi khi chpn cac banh rang thay thg a,b,c,d cin thoa man dieu Idgn:
-<S (6)
"f
•10
Khi sai s6 goc nghieng dp cua banh rang gia cong tinh bang giay thi ta co:
n:.S.dfi.cos/)
648000( !t.m„ Z ± S.sm fi) (7) 5 6 7 « 9
Hinh I.Said cau true dong hgc mdy T.m„2
sin fi
P: Goc nghigng cua banh rang gia cong.
m_: Mo dun cua banh ring gia cong.
Thay (2) vao cong thiic (1) ta co:
(2)
2. iTNG DUNG MAY TINH TRONG TINH TOAN DIEU CHINH
Dg xac dinh a,b,c,d ta co thg ap dung tinh toan nho cac phim mgm ISp trinh trgn may tinh.
Hien nay, co nhigu phSn mgm co the ap dung dg lap trinh tinh toan nhu Turbo Pascal, lap trinh C, Foxpro, Matlab,...Trong npi dung nghign c ^ a day sii dung ngon ngii lap trinh Turbo Pascal de lap phan mgm tu dpng cho qua trinh tinh toan. ^
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2.1. Sff d^ tinh toan Nhap gia tri P,m.,K,iip,Z,S7[i]
T 1 1 - . _ CKTinin j , _ Sdpcosii . _ Uj.Cj
^~inTl,^±S.siiyt ~inn„z+s.smB " bj.dj
a,b,c,d
Hmh 2. Sa do tinh todn bdnh rdng thay the Cac thong s6 nhap vao chuong trinh la goc nghigng P, m6 dun m^ cua banh rang gia cong, s6 diu m6i cua dao K, sai so cho phep ciia goc nghigng dp, s6 rang cua banh rang gia cong Z, lupng chay dao S, so rang ciia cac banh rang thay thg Z[i] ciia may. Chuong trinh tinh toan se dua ra kgt qua la so rang ciia cac banh rang thay thg a,b,c,d.
2.2. L^p trinh tinh toan tren mSy phay lan rang ZFWZ-250
l6XJtm, njn^Z-S.smfi (8)
Lupng chay dap trgn may dupc xac dinh:
S = 3.j,
A, rf, (9)
Trong do: a,,b,,c,,d| la cac banh rang thay thg cua xich chay dao.
Tinh toan khi c i t banh rang c6 goc nghieng P=7°30', mo dun m^=2, hu6ng xojn phai, s6 d i u m6i ciia dao K= 1, sai s6 goc nghieng cho phep dp=2,5". Lupng ch^y dao S=0,8mm/
vong (tuong iing chpn: a,=40, b|=50, c,=25 va dj=75). Bp banh rang thay the Z[i] ciia xich phan dp CO cac banh rang vol so rang la: 20, 20, 21, 22, 23, 24, 25, 25, 26, 27, 28, 29, 30, 30, 31,32, 32, 33, 34, 35, 36, 37, 38, 39 40, 4 1 , 42,43,44, 4 5 , 4 6 , 4 7 , 48, 49, 50, 5 1 , 52, 53, 54, 55, 56,57, 58, 59, 60, 61, 62, 63 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100.
C6ng thiic digu chmh khi gia cong trgn Ket qua chay chuang trinh tinh toan co may phay lan rang ZFWZ-250: hign thi man hinh nhu hinh 3:
t- Bu yhin.
Ztmn'-i
'M nhap duang dan n o l < l / 8 > : a lac banh rang CUB bo l a :
20 20 21 22 36 37 38 39 S( 57 58 59 76 77 78 79 97 98 99 l a a DiBp goc nghieng thap phut 4hap Biay Oiap MD dun •
23 48 68 BB
Qiap so dau m i dao K Oiap i n r a n g Z Biap E a i so goc nghlan O H P banh a l cua Owp banh bt cua O i ^ banh c l cua Owp banh d l cua Zaa ba banh rang to thu 1 : a-SS, to thu 2 : B-3S, to t h u 3 : a - 5 7 . :Ui 3 bo buih ran
24 ! 5 25 11 42 43 it 62 63 Bl B2 83 Pang(da>:7
= 30
•-«
••2 •-1 g <gUy>:Z.5 :30 chau d a o : 4 8 Kich ehav daoiSS Kich Kich thoa b M l b-«G b ^ I t t h a t
chay d a o : 2 5 chay daoiTS
•wn U : C-S7, d - 9 ! 0 - 7 6 . d-B2 0 - 7 6 , i-n
2G 44 64 B4
27 45 65 B5
2B 46 66 86
29 47 67 87
3B 48 68 fl?
30 49 69 90
50 31 70 91
32 5 1 71 92
32 52 72 93
33 53 73 94
34 54 74 95
35 55 75 96
Hinh 3. Mdn hinh hien thi chgy chuang trinh
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T ^ P CHl CO KHf V I 6 T NAM, S6 10 nam 2015 www.cokhivietnam.vn
NGHIEN cufu - TRAO DOI
3. DIEU CHINH MAY ZFWZ-250 GIA CONG SAN P H A M
Hinh 4. Sdn phdm gia cong Dieu chinh may dong hoc may:
- Xich tdc d6: n^=200 vong/phiit.
-Xichphan do: J, = —X—= — x — b d S2 66
a, c, 40 25 - Xich chay dao: /, ^ — x - ^ = — x —
A, rf, 50 75 Dao phay: Goc nang X,^1M8'; xoan phai.
San phim gia cong nhu tren hinh 4.
4. DANH GIA KET QUA
Ki6m tra goc nghieng cua banh rang gia cong tren may do goc nghieng banh rang tru.
(Mdy da duac CSng ty TNHH Nha nu6c Mgt thanh vien Diesel Song C6ng cdp gidy chung nh$n ling dung thilt bi vao san xudt ngay 26 thang 11 nam 2013). Cac dac tinh ky thu$t cua may: Sensor kiau quay quang dien tur do goc quay cua vat, d6 phSn giai 2000 xung/vong. Sensor kilu quay quang dien tur do goc quay cua true vit me bi, dp phan giai 720 xung/vong. Vit me bi model 1605 cua hang TBI motion- Taiwan. S6ng trucrt bi vuong s6 hieu size 15 hang BOSCH REXROTH Germany. Vi xu ly LM4F 120 XL hang Texas intrusment USA. Ngu6n cdp 12V, 4 Ah, Vitalize Korea. Man hinh hiln thi kit qua do LCD 1602. Kich thudc vat do la:
Hinh 5. Thiet bi do vd kit qud do
^raax"!^**' L„ax"180. Diu do kilu tilp xiic. Do chinh xac goc nghidng do dugfc ±2'. May da dugc cong ty Desoco kiem tra thuc nghidm va chiing nhan dat dugc cac d^c tinh nhu m6 ta tren va dugc ban iSnh dao Desoco duyet ung dung t^i Phong Quan 1;^ Chat lugng cua Cong ty de phuc vu kiem tra goc nghieng banh rang gia cong tai Cong ty.
B6 tri thilt bi do va kit qua do nhu tren hinh 5. Goc nghiSng banh rang gia cfing do dugc ia 7'^30'09". Gia tri nay co sai lech so v6i tinh toan la do cac anh huong trong qua trinh do nhu dg tiep xuc giua dau do va bien dang rang, do chlnh xac ciia may do.
5. KET LU-4N
Viec ling dung cac cong cu lap trinh tu dgng dl lap chuang trinh tinh toan trg gliip cho qua trinh dieu chinh may co the dua ra dugc ket qua tinh toan chinh xac va nhanh chong, dam bao n3ng cao dugc do chinh xac gia cong va thuSn tien cho nguai sir dung. K6t qua kiem tra danh gia san pham gia cong thuc kMng dinh su diing dan Clia qua trinh tinh toan ciing nhu phuang phap gia cong va c6 the ap dung chiing vao thuc tl san xuat. Ket qua nghien ciiu la|j trinh tinh toan tu dgng nay c6 the phat triSn d6 iing dung cho viec tinh toan di6u chinh khi gia cong cac san pham khac tren may phay lan rang cung nhu cho cac may cong cu khac de ma rong, khai thac dugc het tinh nang ciia may, nhu gia cong banh rang tru rang nghieng tren may phay true then hoa hoac may phay ren v6n khong co xich vi
ISSN 0866 - 7056
TAP CHl CO KHf VI|T NAM, S6 10 nam 2015 www.cokhivietnam.vn
Ngay nhgn bai: 02/10/2015 Ngay phan bien: 14/10/2015
Tki lifu tham khao:
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[2]. C. Innocenti University of Modena and Reggie EmiliaModena, Simple techniques for measuring the base helix angle of involute gears, Italy. 12 th IFT oMM world Congress, Besancon, Jun 18 -21, 2007.
[3]. SAE.Wanendale, PA, Gear Design, Manufacturing and Inspection Manual, vol. AE-15, ISBN 1-56091-006-2, 1990.
[4]. Qiu Zurong, Shi Zhaoyao and Li Yan, "The Research of Machinery Manufacturing Measurement Technolog^^
China Engineering Science, vol. 12, pp. 13-19,October, 2010.
[5]. N.Acherkan,D.Sc, Machine tool design, Mir Publishers Moscow, 1968.
[6]. Hehni A. Youssef, Hassan Al-Hofy, Machining Technology: Machine Tools and Operations, CRC Press, 2008.
[7]. PH. Joshi, Machine Tools Handbook: Design and Operations, McGraw Hill, 2007.
[8]. MnnerpHK, B.A lUHmoB, TaBJiHuw fljia nofl6opa sySHrtix loiec, MauHHOcxpoeHHe, 1973.
ISSN 0866-7056
TA.P CHi CO KHI V I £ T NAM. S6 10 nam 2015 www.cokhivietnam, vn
