NGHIEN Cl>U-TRAODOI
V N G H I E N CLPU THLfC NGHIEM O^ XAY DLPNG BO THONG S6 CONG NGHE KHI GIA CONG VAT LIEU
Cr TREN MAY C A T DAY TIA LCPA DIEN CNC DEM 320
EXPERIMENTAL RESEARCH TO BUILD THE SET OF TECHNOLOGICAL PARAMETER IN THE PROCESS OF MACHINING Cr MATERLVLS ON 320 EDM
CNC ELECTRIC-SPARK WIRE MACHINE
ThS. Do Anh Tuan, ThS. Trinh Thi Mai TrUdng Dai hoc Kinh te Ky thuat Cdng nghiep TOMTAT
Phddng phdp gia cong tia Ida dien noi chung, phUdngphdp gia cong cdt ddy tia Ida dien CNC noi rieng, dd dUOc dp dung td lau vd dUdc biet den nhU Id mgt trong cdc bien phdp cong nghe quan trgng cua gia cong hien dgi. Phddng phdp gia cong ndy, co nhieu Uu diem vd hieu qud kinh te tddng doi cao; cho phep gia cong dUdc nhieu dgng be mat khdc nhau vdi do chinh xdc cao, ddc biet Id gia cong dUdc nhdng vdt lieu cd do cdng cao md khong gap bdt cd trd nggi gi. Tuy nhien, mgt trong cdc yeu to chinh quyet dinh tdi hieu qud kinh te ciia phUdngphdp gia cong ndy, do Id Idm the'ndo thiet lap dUdc thong so cong nghe hdp ly khi gia cong de vda dam bdo dUdc chat lUdng sdn phdm, vda ndng cao dUdc ndng sudt gia cong. Bdi bdo, trinh bdy ket qud nghien cdu tU viec gia cong thUc nghiim tren mdy cdt ddy tia Ida diin CNC DEM320, qua do dUa ra dUdc bg thong so cong nghe hgp ly tren mdy, giup tdng ndng sudt khi gia cong.
TU khda: Cdt day tia Ida dien CNC; Thong sd cong nghe.
ABSTRACT
Electric-spark processing method in general and CNC electric-spark wire cutting processing methods in particular has been applied a long time. It is known as one of the important technological solutions of modern machining. The method has many advantages and relatively high economic efficiency. A lot of different surface types can be processed by this method with high accuracy. Especially, it also allows to process materials having high rigidity without any obstacles. However, one of the main factors deciding economic efficiency of the processing methods that is how to establish reasonable technological parameters to both ensure product quality and improve machining productivity. This paper presents the research results from the experimental processing on 320EDM CNC electric-spark wire cutting machine to offer the set of appropriate technological parameter on the machine to help increase productivity.
Keywords: CNC electric sparks wire cutting; Technological parameters.
ISSN 0866 - 7056
TAP CHi CO KHi VIET NAM, So 5 nam 2016 www.cokhivietnam.vn
NGHIEN C l i u - T R A O D O I
1. MO DAU
Gia cdng cat ddy tia Ifla difa CNC la mpt trong nhflng phflang phdp gia cdng mdi, dflpc flng dung nhilu trong ngdnh Chi tao co khi;
ddy cung la mpt phflong phdp gia cdng tiln tifa dfloc dp dung dung de che tao va gia cdng nhflng chi tift cd dp phflc tap cap, nhflng chi tift cd dp cflng khdc nhau tfl nhd dfa ldn ma cdc phfldng phdp gia cdng khac khdng lam dflpc hay nfa lam dflpc cung mdt kha nhieu thdi gian va chi phi.
Che dp cdng nghe khi gia cdng chi tilt trln mdy cat ddy tia Ifla difa CNC phu thupc rat nhilu vdo vdt Mfa chi tift gia cdng (tmh dan difa, dan nhift...). Do dd. vile van hdnh mdy cung nhfl Ifla chpn dfloc cac thdng sd gia cdng hpp ly dl gia cdng chi tift trong thflc te la mpt difa rat quan trpng, nham tang nang sudt gia cdng. De tdi dfla ra dflpc kit qua xdy dflng thflc nghilm ve bd thdng sd cdng nghe khi gia cdng chi tilt trfa may cdt day tia Ifla difa CNC DEM320, nhdm tang ndng sudt gia cdng.
2. NOI DUNG
2.1. Gidi thifa ve mdy cat day tia Ifla dien CNC DEM320
vflng ciia day cat, mdy phat difa tan sd cao, thdng dilu khien thi may cdn cd flu diem la t dp cat ldn, dd bdng cao, do tm cdy va tinh i dinh cao. Vdi nhifa tinh nang cat gdn gui vdi c may cat day truyen thdng EDM (EDM sfl du ddy cat bang ddng, DEM sfl dung day cat ba molipden). Dd la sfl cdi tiln dang kl ve tdc do ( cho may cat day.
- Mdy la thiet bi tdt de cat cdc vat lieu dp cflng cao, thep cac-bon va cdc vat hfa dac b de che tao khudn.
- Mdy cd the dflpc sfl dirng de cat n«
cdc bifa dang phflc tap ma mdt sd mdy thd thfldng khdng the xfl ly dflpc. Vi du: Gia cd cdc chi tift cd rdnh rat nhd, sdu. Hoac khi cac g hinh ndn tfl 0"-30°.
2.1.2. Thong s6 ky thuat cua mdy
Ktnh J. May cdt ddy tia Ida dien CNC DEM 320
2.1.1. Cng dung
DEM320 la mdy cat ddy tia Ifla dito CNC, tdc dp cap dflpc dp dung cho kha nang cat phdi dat kich thfldc chinh xdc, dp bdng cao vd cac chi tift cd bifa dang cdn phflc tap. Dfla trln sfl bfa
Kich thridc ban may Chieu day phoi cat 16n nhat Trong liiong phoi cat 16n nhat Hanh trinh true X Hanh trinh true Y Hanh trinh true U Hanh trinh true V Toe do cat 1cm nhat Nhip dl ehuyen DilcJng kinh day c^t Khoang day DUcJng kinh ru 16 Hanh trinh di chuyen 1cm nhat eua ru 16 Cong suat dong ccf ru 16 Do nham be mat He dieu khien Cong suat toan may Kich thil6e toan may
1 Trong luong
5 7 0 x 3 5 0 300 500 320 250 55 55 180 0.001
0,18 0,25 180 230 370 0,8-1 DM-XPCNC
4,5 1300x1800
X2100 1500
mni f n m
H
mm mm rmE mm nmf/c nui mn mn ran mn W
\m
KV
k
ISSN 0866 - 7056
E l TAP CHl CO KHI VIET NAM, S6 5 nam 2016 www.cokhivietoani.vn
NGHIEN CO'U - TRAO eOl
2.2. Qua trinh thifc nghiem
2.2.1. Lda chon doi tUdng thUc nghiem, phddng phdp thdc nghiem
- Cac tham so bao gom; (Ton), (Toff), (IP), (Toe do day cat).
- Doi tnqng thdc nghiem dUdc lUa chpn (i day la:
+ LUa chgn vat lieu thiJc nghiem: Cr.
+ May tien hanh thUc nghiem: DEM320.
- Phiidng phap thiic nghiem: Tien hanh cat contour phang cac san pham mau.
2.2.2. Bdng ket qud thdc nghiem bg thong so cdng nghe khi gia cong vat lieu Crom vdi chieu ddy khdc nhau
DUa vao dac tinh ky thuat chinh cua may DEM320, de tang nang suat khi gia cong cat gpt ta can cut chu yeu vao cac tham so chinh trong qua trinh cat cua may.
Hinh 2. Thdi gian gidi chu ky bat vd tdt xung nhip
Trong do:
+ Ton: Thcfi gian bat xung nhip (dai do tif 1 - 127);
+ Toff: Thdi gian nghi xung nhip (dai do 1 - 1027);
+ IP: Gia tri cao diem cho 1 lan xung (dai 1 - 1 0 )
- Qua viec gia cong thifc te tren may DEM320, tac gia diia ra dUdc bang ket qua thUc nghiem bg thong so cong nghe khi gia cong vat lieu Cr:
gl. Vdt lieu: Cr - Chiiu ddy vdt Ueu: 5mm
Muc 1 2 3 4 Dp chinh xdc Hifa qua
Tham so dieu chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tdc do cuon day
40 30 20 20
Thdng Cat lan
dau 0.1
Cat lai l a n l
0.13 0.09
sdbu Cat lai
lan 2 0.152 0.112 0.092
+0.005 35
+0.005 20
Cat lai ldn 3 0.157 0.117 0.097 0.092 +0.005
11
ISSN 0866 - 7056
TAP CHI CO KHI VIET NAM, S6 5 nam 2016 www.cokhivietnam.vn
NGHIEN CLfU - TRAO D O I
g2. Vdt lieu: Cr - Chiiu ddy vdt lieu: 10mm
Muc 1 2 3 4 Do chinh xdc Hieu qua
Tham sd di^u chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tdc do cuon ddy
40 30 20 20
Thdng Catldn
ddu 0.1
C a t l ^ I d n l 0.127 0.087
so bit Cat lai
Ian 2 0.145 0.105 0.085
+0.005 48
+0.005 30
C a i a i Ian 3 0.15 0.11 0.09 0.085 +0.005 17 Bang 3. Vdt lieu: Cr - Chieu ddy vdt lieu: 20mm
Muc 1 2 3 4 Dp chinh xdc Hieu qud
Tham sd dieu chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tdc do cudn day
40 30 20 20
Thdng Cat Ian
ddu 0.1
Cat lai Idnl 0.122 0.082
s d b u Cat lai
lan 2 0.135 0.095 0.075
+0.005 80
+0.005 55
Cat lai lan 3 0.142 0.102 0.082 0.077 +0.005 35 g 4. Vdt lieu: Cr - Chiiu ddy vdt liiu: 5mm
Muc 1 2 3 4 Do chinh xac Hieu qua
Tham sd dieu chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tocdd cudn day
40 30 20 20
Thong Cat Ian
dan 0.1
Cat lai I d n l
0.1 0.08
s d b u Catiji
Ian 2 0.137 0.097 0.077
+0.005 85
+0.005 65
Catlai Idn 3 0.14 0.10 0.08 0.075 +0.005 44
ISSN 0866 - 7056
TAP CHl CO KHi VIET NAM, S6 5 nam 2016 www.cokhivietnam.vn
NGHIEN C L f U - T R A O D 6 |
Bang 5. Vdt lieu: Cr - Chiiu ddy vdt lieu: 40mm
Mac
1 2 3 4 Dd chinh xac Hi$u qua
Tham sd di^u chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tdcdd cudn day
40 30 20 20
Thdng sd bu Cat Idn
dau 0.1
Catlai I d n l
0.12 0.08
Catlai ldn 2
0.13 0.09 0.07
+0.005 88
+0.005 70
Cat lai lan 3
0.14 0.1 0.08 0.075 +0.005 50
Bdng 6. Vdt lieu: Cr - Chiiu ddy vdt lieu: 70mm
Muc
1 2 3 4 Dp chinh xdc Hieu qua
Tham so didu chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tdcdd cudn day
40 30 20 20
Thdng sd bu Cat ldn
ddu 0.1
Catlai I d n l
0.13 0.09
Catlai Ian 2
0.13 0.09 0.07
114 +0.005
80
+0.007 63
Catlai ldn 3 0.13 0.09 0.07 0.065 +0.005
53
Bang 7. Vat lieu: Cr - Chiiu diy vdt lieu: 100mm
Miic
1 2 3 4 Do chinh xdc Hieu qua
Tham sd dieu chinh Ton
40 10 2 1
Toff 200 60 12 10
IP 5 3 2 1
Tdcdd cudn ddy
40 30 20 20
Thdng sd bit Cat lan
dau 0.1
Catlai Idnl
0.13 0.09
Catlai lan 2 0.127 0.087 0.067
-0.01 +0.005 83
+0.007 63
Cat lai Idn 3
0.13 0.09 0.07 0.065
±0.01 53
ISSN 0866 - 7056
TAP CHl CO KHI V I £ T NAM, S6 5 nam 2016 www.cokhivietnam.vn
NGHIEN C l i u - TRAO D O I
2.3. Ket qua vd thao ludn
Vdi phddng an thdc nghiem, gia cdng thdc te chi tiet tren may cat ddy tia Ida dien CNC DEM320, trong qua trinh van hdnh, tiep can vd nghien cdu, kem theo dd la nhdng sdn pham da gia cdng cu the. Tac gid da dila ra dddc bp thdng sd cdng nghe khi gia cong vdt lieu Cr tren may cat ddy tia Ida dien CNC DEM320 va rut ra ddpc mdt sd kinh nghiem cua ban thdn khi van hanh va sd dung mdy de tang ndng sudt cat got, cu the:
+ Khi chieu day cua phdi ldn, thddng chpn xung rpng, ddng ldn, bddc tien cat cham, tdc dp day nhanh;
+ Khi phdi mdng chpn xung nhd, ddng nhd, bildc tidn cat nhanh;
+ Khi cdn gia cdng tinh, chpn xung nhd, ddng nhd, tdc dp ddy cat nhd.
Ket qua thdc nghiem bd thdng sd cdng nghe khi gia cdng vat lieu Cr d tren, hoan todn cd the md rdng pham vi dp dung lam tien de d l gia cdng cho cac chi tiet vdi vat Heu khdc.
3. KET L U A N
D i & khien Unh hoat bp tham sd gia cor chinh trong qua trmh gia cong chi tidt, ddpc o la yeu td quyet dinh trong qua trinh vdn ban mdy, giup tang nang sudt gia cdng, tang hieu qi stf dung day cat, tang dp bdng bd mat chi ti^
giam thieu nhdng ydu td lam dnh hudng ddn qi trinh gia cdng.
Crpm la Ipai vdt lieu cd dp cdng cao, <
kha ndng chdng mai mdn tdt, ddpc dng dut nhieu trong nganh Co khi. Viec gia cdng C bang cdc phUdng phap gia cdng truyen thdn ddi hdi chi phi ldn, ndng sudt vd ehdt Idflng g cdng khdng cao, ddc biet la cdc bd mat phdc ta Khi gia cdng bang tia Ida dien, do tinh dan dit vd nhiet cua Cr khac so vdi vdt lieu thdng thddi khac, nen lam cho nang suat va chat Idpng g cdng thay ddi. Vi vdy, viec nghien cdu bai thdc nghiem dd dda ra bd thdng sd cdng ngi gia cdng vdt Meu Cr cd y nghia rat ldn trong c nghien cdu thdc nghiem gia cong cdc chi tiet dd cdng cao. •
Ngay nhdn bai: 21/3/2016 Ngay phdn bien: 17/4/2016
Tai lieu tham khao:
[1]. PGS,TS. Vu Hoai An (2007); Gia cdng tia Ida dien CNC, NXB. Khoa hpc va Ky thuat.
[2]. Dinh Wn De; PhUdngphdp gia cdng dgc hilt, TrUdng Dai hpc Cong nghiep TP.H6 Chi Minh.
[3]. Hoang Vinh Sinh; Nghien cdu dnh hUing cua chilu day phdi vi dd dii xung din do nham be mdt khi cdng chi tilt bdng cat ddy tia Ida diln. Tap chi Khoa hpc va Cdng nghe, Dai hpc Da Nang, sd 42 nam 2011 [4]. LUu Ddc Binh; Nghien cdu dnh hudng cia cdc thdng sd cdng nghe den nang sudt khi gia cong bang cat i tia Ida dien, Tuyen tap cdng trinh khoa hoc Hoi nghi Co hpc Toan qudc lan thd 9, tap 4, 2013.
[5].http://www.wgm-maschinen,de/Knuth-Machines.
ISSN 0866.7056
TAP CHI CO KHi V I £ T NAM, Sd 5 nam 2016 www.cokhivietnam.vn
