NGHIEN CUU - TRAO

NGHIEN CUU - TRAO

NGHIEN CCTU CONG NGHE Gifl

C O N G

CHI TIET TREN MflY TIEN CNC

GS.TS. Tran Vdn Djch', TS. Ho^ng VSn Giyt\ Le Ngpc Kinh^

'Trudng Dai hpc Bach khoa Ha Npi, 'Vipn Nghien cu'u Cd khi 'Trudng Cao ddng Nghe Cdng nghipp Hd Npi

TOM TAT

Trong Ind lido ndy, cdc tdc gid trinh hiiy nhdvg kc/t qud thu duc/c khi img dung phucmg phdp qiiv hoach thyc nghiem. cimg nhiephdn nicni Tahleciivc 3D v4.0.01 de ve do thi hieu dien moi quan he giira che dc) cdt x'c'ri dc} nhdm he mat iren nuiy tien CNC AC-1840 (Ddi Loan), v&i dung cu cdt DNMG

I1040HE-Mciia hdng CILDEMESTER. vat lieu gia cong thep 4()X.

ABSTRACT

In thispaper, the authors present the results obtained when applying the method of experimen- tal planning, as well as 3D v4.0.01 Tablecuve software to graph represent the relationship between cutting regimes with roughness surface of AC-1840 CNC lathe (Taiwan), with cutting tools DNMG GILDEMESTER 110408E-M's, 40X steel material processing.

1. DAT VANDE

Cd rdt nhilu yeu td dnh hudng din qud trinh tien nhu: Dp cung vimg cua he thdng cdng nghe, dp chinh xac cua may, chat lupng vd thdng sd hinh hpc cua dung cu cat, ehe dp gia cdng.. .Chung cd anh hudng din cac thdng sd dau ra la cac chi tilu ve kinh tl va ky thuat nhu: Nang suat, chat lupng va dp chinh xac be mat, mdn va tudi ben dung cat.. .Trong dd thdng sd cdng nghe dnh hudng ldn tdi qua trinh gia cdng. Vile xac djnh ehl dp cat hpp ly khi gia cdng tren may tien CNC, vdi trang thiet bj cdng nghe mdi nham khai thac triet de tinh nang cac loai hinh thiet bj cdng nghe la mdt nhiem vu cap bach. De thuc hien muc tieu tren, nhdm tac gia xin gidi thieu ket qua thuc nghiem tim ra che dp cat hop ly de tien tdi tdi uu hoa qua trinh cat gpt tren may tien CNC bang phuong phap quy hoach thuc nghiem vdi muc tieu dat chat lupng be mat cao khi gia cdng chi tiet true, vdi vat lieu thep 40X bang ludi cat manh hpp kim DNMG 110408E-M cua hang GILDEMESTER

tren may tien CNC AC-1840.

2. MO TA THIET BI THI NGHIEM

2.1. Thiet bi thi nghiem:

May tien CNC Ky hilu: AC 1840

2.2. Dung cy c^t va phoi dung trong thuc nghidm

* Dung cu cat: Dung dao vai gan manh hpp kim cung

Ky hieu dao: DNMG 110408E-M Hang chi tao: GILDEMESTER Kich thudc can dao: 20x20x120

* Phdi dung trong thuc nghiem:

- Vat lieu thuc nghiem: Thep 40X do Lien Xd san xuat

- Kich thudc phdi: Dudng kinh d = 25 mm; chilu dai L = 50 mm

* Chi tilt gia cdng : Dudng kinh d = 20 mm;

chilu dai I = 30 mm

TAP CHf CO KHf VlfiT NAM

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NGHIEN

CIJTU

- TRAO 0 6 l

2.3. ThiSt bi kiim tra 2.5. Phu'ong phap thi nghiem:

Thiet bj do dp nham bl mat : May do dp nhdm Su' dung phuong phap quy hoach thuc nghiem chuyen dung SJ - 201- Mitutoyo

3. KET QUA THUC NGHIEM 2.4. Mo ta thi nghiem

Can CU' vdo cac kit qua thi nghilm, cac dilu Thi nghiem cat thu se dupc thuc hiln trin kiln biln vd u'ng dung quy hoach thuc nghilm, 3 nhdm: nhdm tac gia da tiln hdnh cdc thi nghiem, va thu

Thay ddi van tdc cat (v), cdn s, t = const dupe kit qua dupe trinh bay trong bang sau:

Thay ddi budc tiln dao (s), v, t = const Thay ddi chilu sau cat (t), s, v = const

Bdng 1: Ma trdn theo ket qud thi nghiem

S o m a u

thii'

1

T

3 4 5 6 7 S

Y e u to a n h hirotng

X l

( 1 ) - -^

-

— -

— -

X 2

( 2 ) -

—

—

—

X i

( 3 ) -

- -

—

—

—

xjX:;

( 4 )

^ - -

—

— - -

X1X5

( 5 )

—

—

—

X2X3

( 6 )

—

— - - -

—

X l X ; X ;

( 7 ) -

—

— -

— - -

G i a tri b i e n do3 cua cac t h o n g so

V a n t o e

cat

( v g p ) C8) 1 2 6 1 6 3 1 2 6 1 6 3 1 2 6 1 6 3 1 2 6 1 6 3

C h i e u sau

cat

"t"

( m m ) ( 9 ) 0 . 2 5 0 . 2 5 0 . 5 0 0 . 5 0 0 . 2 5 0 . 2 5 0 . 5 0 0 . 5 0

Bu'dc t i e n " s ' ' ( m m v g )

i:io) 0.05 0 . 0 5 0 . 0 5 0 . 0 5 0-15 0 . 1 5 0 . 1 5 0 . 1 5

E>6 n h a m b e m a t Ra(pjia)

(11) 0 . 9 4 5

0.52 1.25 0 . 4 2 2 . 3 2 5

0 . 4 6 1.37 0 . 5 2 5

Thdi g i a n cat

m a u t (ph>

<12) 2 . 9 9 2 . 3 1 1 6

1.495 1.1558 0 . 9 9 6 8 0 . 7 7 0 5 4 . 9 8 4 . 3 . 8 5 2 7

Phfldng trinh hdi quy phu thudc gifla dp nham bl mat (Ra) va ba thdng sd x^, x^, x^ la:

y = a„ + ajXj + a^x^ + a3X3 + a^x^x^ + a^x^x^ + a^x^x^ + ^^,x^x^

Sau khi xac dinh cac he sd a cua phfldng trinh hdi quy, kiem tra y nghia cua cdc he sd dd theo chuan STUDENT phfldng trinh hdi quy cd dang:

y = 0,976875 - 0,495625x^ - 0,085625x2 + 0,193125x3 + 0,076875x^X2 - 0,181875XjX-0,136875x2X3 + 0,178125x^x^X3

Cfng dung phan mem Tablecuve 3D v4.0.01 de ve dd thi bieu dien mdi quan he gifla dp nhdm

b l mat vdi 2 thdng sd cua che dp cat nhfl sau: CJF=

r n A T» A ^ T X T CO KHf VlfiT NAM V Sd 9 (Thang 9 nam 2011)

NGHIEN cufu - TRAO D 6 |

QUAN HE DO NHAM VOI S, V KHI TIEN

• \

Hinii /: / ' i ' //// I'lcii dicu uiii (jutui hi- guiu R \u'>i •^ vd V

tfldng thich, cd y nghia todn hpc xdc djnh hodn todn milu td dflpc bdn chat qua trinh. Ddy la ca sd khoa hpc cho vile nghiln cflu tdi flu hod chi dp gia cdng trin mdy ti|n CNC.

Vdy: Qua nghiln cflu bdng ly thuyet vd kit qud thflc nghilm nhdm tdc gid rut ra dflpc kit qua che dp cdt hpp ly cho ndng suat cao, chat Ifldng bl m^t tdt nhfl sau:

Bdng 2: Cdc gid tri kiem nghiim vd kit qud

\ ^

Hmh 2: I.a do llii hieu (hen inoi tjuuu he e/T/<; liu \'di > vu t

%'*•

Hinh 3: Ld do thj bieu dien mdi quan he giUa Ra vdi tvdv

Bang phfldng phdp quy hoach thflc nghilm vd kit hpp flng dung phan mem Ta- blecuve 3D V4.0.01 d l ve do thj bieu dien mdi quan he gifla che dp cat vdi dp nhdm bl mat cdn cfl vdo gid tri cua a nhfl sau: Cac gid trj al, a2, a3 cd dnh hfldng nhilu hdn, cdn sfl anh hfldng ddng thdi cua 2 bddc 3 thdng sd trin la khdng dang ke.

Tilp tuc kiem tra sfl tfldng thich cua phfldng trinh hdi quy theo chi tilu Fi-shdr, cd the di den kit ludn rang phfldng trinh hdi quy

Van t6c cit

"V (vg p) 163

Chieu sau cit t (mm)

0,5

Budc tiin Y (mmvg)

0.05

{)6nhaflib«

matRa(fim)

0.41

Thin gian cat mau t(ph)

• 1J558

4. KET LUAN

Trong bdi bdo nay, nhdm tdc gia trinh bay phfldng phdp nghiln cflu bang thflc nghilm dp chinh xdc gia cdng (dp nhdm bl mat) trin may tiln CNC - phfldng phdp quy hdach thUc nghilm vd kit hpp flng dung phan mlm Tablecuve 3D V4.0.01. Lfng dung phfldng phdp trin thu dxiOc kit qud ddng tin cdy khi gia cdng chi tilt true trin mdy tiln CNC AC-1840, dad DNMG 110408E- M, vdt lieu thip 40X. Kit qud nghiln cflu la cd sd cho vile tdi flu hod cdc thdng sd cdng nghe trin cdc mdy tiln CNC khac nhau. *l*

Tai Uf u tham khao:

[ 1 ] Tran Van Djch (2009), Cdng nghe CNC, NXB Khoa hpc va ky thuat, Ha Ndi

[2] Tran Van Dich (2009), Nguyen ly cat kim loai, NXB Khoa hpc va ky thuat, Ha Ndi

[3] Tran Van Dich (2008), Cac phfldng phap xac dinh dp chfnh xac gia cdng, NXB Khoa hpc va ky thuat , Ha Npi

[4] Hoang Van Gpt (2002), Nghien cflu anh hfldng ctia mdt sd yeu td cdng nghe den be mat bam dinh cua ldp phii kim loai dflpc phun bang phfldng phap nhiet khi - Luan an Tien sy ky thuat 2002

[5] Nguyen Doan Y (2003), Quy hoach thflc nghiem, NXB Khoa hpc va ky thuat. Ha Ndi

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