Do Diic Trung vd Dtg Tap chi KHOA HQC & CONG NGHE 173(13): 7-11
XAC DINH CHU KY THAY T H E CHO CHAY TREN CUA KHUON EP GACH CERAMICS TREN C O S d M 6 N T H E O Y ^ U CAU DO TIN CAY
Do Dd'c Trung''', Ho&ng Ti^n DQng', Tr4n QuSc Hikng*, Nguyin XuSn Dinh^
'Tnrdng Dai hgc Cong nghiep Ha Ngi Truang Cao dang Cong nghiep Thai Nguyen TOM TAT
Bk\ bio niy tiinh b&y k^t qua nghiSn cim xdc dinh chu kj' thay the cho chay tien ciia khuon ^p gach ceramics tifin co so m6n theo yfiu cSu 33 tin c3y. Tien hinh thuc nghiem tien 45 mau khu6n, moi mlu khuon dupe do d§ m6n sau 5 moc thiri gian lim viec li 0 gio, 230 gia, 460 gio, 690 glo' vi 920 gid tai nh4 miy gach Mikado Thii Binh dS xiy dung him d6 tin ciy tren co so m6n vi bang tia gii trj dp tin ciy theo thoi gian lim viec cua chiy. Tir 66 xac dinh duoc chu kj* thay thfi cho khu6n theo ySu cSu v^ dp tin cgy. Sau d6 huong phit tii^n cho cic nghien ciru ti^p theo ciing duoc &k cip den trong bii bio niy.
Tirkh6a:C/iu ky thay the, casdmon, d^tincgy, khuon ep gach, Nha may ggch Mikodo Thai Bmh GIOI THIEU
Trong xu thi h^i nh|lp v^ phat trien, trong nhiing nam gan day, nganh san xuat v^t li?u xay dyng nu6c ta da co nhQng tien bp dang ke. Nhi may gach Mikado Thai Binh la mgt trong nhUng nha may di dau trong vi$c dau tu vao ky thu^t va c6ng ngh? trong sin xuat gach ceramics, v6i dSy chuyen s^n xuat dong b6, hien dai nhSp khau tir chau Au [3, 5, 7].
Trong qua trinh san xuat gach ceramics, co nhiiu yeu to anh huang den nang suat va chat lugng cua san pham (do chinh xac, tinh tham my,...). Trong do chat lugng ciia khuon ep (khuon tren va khuon duoi) co anh huong Ion d€n dp chinh xac cua san pham.Trong khuon ep gach ceramic, dO bfin, do chinh xac ciia chay ep (chay tren va chay duoi) co anh huong true tiep toi hieu qua cua qua trinh gia c6ng(ca v6 dg chinh xac cung nhu yeu to tham ml). Cac dgn^ sai hong chii ygu cua chay khuon ep bao gom: do mon, siit me, bien dang hinh hoc,... Trong do sai hong do mon la mpt trong nhung yeu to quy4t dinh nfin do chinh xac ciia san pham, qua do anh huong nhiSu d6n hi6u quakinh te - ky thu|t ciia qua trinh gia cong. Xac dinh dugc chu ky thay the cho chay ciia khu6n ep gach mgt cdch hgp \^
se l^m thoa man ca hai chi tieu kinh te va ky thuat cua qud trinh gia cong.
Tel: 0988488691, Email: datrung th@gmailcom
Viec xac dinh chu ky thay the cho chay duoi cua khuon ep da dugc thyc hien bai mpt so nghien ciiu [3, 5]. Trong nghien ciiu nay, chiing toi tien hanh thuc nghiem de de xly dung ham dp tin c£iy tren co so mon va bang tra gia tri do tin cay theo thai gian lam viec cua chay tren. Tu do xac dinh dugc chu ky thay thg cho chay tren theo ygu ciu ve do tin cdy. Sau do huong phat trien cho cac nghien ciiu tiep theo cijng dugc d& ctp den trong bai bio n^y.
PHUONG PHAP XAC DINH DO MON CUA C H A Y T R E N KHUON EP GACH Chay tren khuon ep gach
Chay tren khuon ep gach Ceramics tai nha may gach Mikado Thai Binh (hinh 1) dugc lam tii v^t lieu tii thep thep 45. Phan xung quanh mep chay dugc han boi que han hgp kim vdi cac nguyen to co kha nang chiu mon t6t nhu: Mn (1,4 - 1,65%), Ni (0,1 - 0, 15%), Cr (0,45 -^ 0, 55%), P,S (<0,35%), Cu (0,25 - 0,4%), Va (0,02 ^ 0,1%) ... voi thanh phin cac nguyen to hgp kim va tap chat cua que han dugc diing de han vao mep chay cho thay vat lieu mep chay thuoc nhom hgp kim thap CO do ben cao.
Phuwng phap xac dinh do mon Qua nghien ciiu ket cau ciia chay va khao sat thuc te hien tuong mon chay tren tai ca so san xuat, su dung dong ho so cua Hang Mitutoyo (Nhat Ban) de do do mon cua chay tai diSm
Do Diic Trung va Dtg Tap chi KHOA HOC & CONG NGH$ 173(13): 7-11 M nhu trong hinh 2, day la di8m n^m tren be
mat thanh ben tai vi tri ian can cac goc ciia chay, la viing bi mon nhieu nhat [3], [7].
Hinh L Chay trin khuon dp ggch Ceramics cua nha may Mikado Thdi Binh XAC DINH SO L U O N G M A U
So lugng mau N dugc chgn de khao sat phai hgp ly. Cu the, neu lay miu cang Idfn thi c6ng viec khao sal, ucfc lugng cang hieu qua cing dang tin cay. Tuy nhien, neu gia tri JV canglon thi cang ton kem, cang mat nhigu thoi glati va cong siic. Vi vay can chpn s6 lugng mlu la it nhat nhung van dam bao dugc do chinh xac mong muon.
Hinh 2 Vi tri do mon chdy trin Vi sai Ifch chuin a chua biet, nen so lugng mSu Wdugc chgn theo cong thiic sau [1,4, 6].
A / > ^ (1) Trong do:
Up- chi tieu tin cay ling voi xac suat tin cay cho tru6c p.
E - la mpt so dii be dugc chgn truoc sao cho vai_xac suit dp tin cay /? thoa man xac suit PVU-p\<E.
li - ky vpng ciia dai lugng nglu nhien.
s - phuong sai mSu, no dugc xac djnh bing each lay so bp mgt mSu co s6 lugng m > 30de khao sat mon [1, 6]. Thai digm do mon: phuong sai miu s^ dugc xac dinh theo cong thiic:
^ = STATIC".-''5^
Oday:
Uf- lugng mon cua mlu thii thii i.
U- gia trj trung binh ciia lugng mon:
i7 = (ui-l-U2 + - + i%)/m (3) m - so lugng mau khao sat so bg, theo [1, 6]
c6 the chgn m = 32.
Nhu vay, theo ket qua khao sat so b^ ta co:
U = 0.099mm; s'^ = O.OOieSmm^.
De khao sat mon cua chay tren khuon 6p g^ch ceramics chpn xac suit dp tin cay ^ = 0.19, tuong ling co Up = 1.96; va chpn e = 0.012mm [3].
Tii do ta xac djnh dugc:
, 0,00168 JV> 1 , 9 6 ^ - ^ ^ ^ ^ = 4 4 , 6 9 4 5 Nhu vJiy, trong bii bao nay, chiing toi se chpn Af = 45 mlu chay ep Ak tiSn hanh thi nghiim.
MAY THI NGHIEM
Thi nghiem dugc tien hanh tren may ^p gach SACMI PH259.0,do Italia sin xutt (hinh 3), may c6 mgt s6 thdng s6 kj thuat ca ban nhu sau:
- Lye ep lan nhat ciia may: 2590 KN.
- Chu ky ep lan nhSt: 21 lin/phut.
- Ap suit Ion nhat trong xi lanh: P^^ = 350 bar.
KET QUA VA THAO LUAN Ket gad thi nghiem
Ti^n hanh thi nghiem cho 45 mau chiy trSn may ep gach SACMIPH2590, ta dugc ket qUa nhu trong bang I.
Hinh 3. May ep gach SACMI PH2590
B 5 Dilc Trang va Dtg Tap chi KHOA HOC & C 6 N G NGHE 173(13): 7 - 11 Bang 1. Kit qua 3o do mon ciia chay tren Ichudn mo" mSu nen dirge bieu diln duoi dang mpt
ep ggch caramics ham tuyen tinh.
ThM aiem khao sat (giir) Ap dung phuong phap binh phuong nho nhit,
^ ^ —5 ?55 ! « ! §25 ^0 vol mot mlu chay thi nghiem, tren he true toa Dp mon (mm) j ^ ^i_^^^ (|,l„|, ^y j^^ ^^^^ y | „ ,|,j , ^ j , | gian t, true tung bieu thi lugng mon U. Ta ggi qua trinh mon ciia mgt chay sau 5 thoi diem khao sat la mgt the hien mon, thi moi the hien mon se dugc bieu dien bang 5 diem: tai thai diem ban dau to(thai diem 0 gia) thi UQ = 0;
cac diem/,//,//,/Ktuong ung la giao diem ciia duong thing ti.tz.t-^.tuvai cac duong thing ^1,1/2.^3.1/4-
Theo khao sat tai nha may Mikado Thai Binh, lugng mon gioi ban cho phep doi vdi chay tr8n la Ugd = 0,26mm. Goi Ui la lugng mon ciia chay tren thu t t^i thoi diem t thi Uj co dang nhu sau:
Ui = ait + bi (4) Trong do: Ui va b, la cac he so.
Sic dung phan mem Matlap, de xii ly so lieu trong bing 1 theo cac ngi dung chinh sau:
- Thyc hienham/'/o/('i,/(';cJ^ ta dugc do thi cho 45 the hien mon (hinh 5).
- Thyc hien him solve(x/(x)) vol rang bupc Ugh = 0,26mm xac djnh dugc thai gian hong do mon nhu trong bang 2.
Thuc hien ham Regression{xf{x}) xac dinh dugc ham do tin cay nhu bieu thuc 5.
Trong A6:f(x) la do thi ham so can ve co dang a,t+b,; X la vec to mien gia tri cua \\amf(x), chinh la diJ lieu trong bang 1.
fi(t) = 1 - C)[t - 1159,1633)
/60,5827] '•^
Trong do:
- OC—)• l3 ham Laplace.
- t: la thdi gian lam viec ciia chay tren den luc hong do mon
Tir cong thiic 5, cd the xac dinh dugc do tin cay cua chay tren ling vdi moi thdi gian lam vi?c nhat djnh. Sii dung chuong trinh Matlab Xac dinh do tin cay tren co* so* mdn de xii ly sd lieu mdn, ta dugc bang tra dp tin Theo [1, 2, 4, 6], de thuan ti?n cho viec xay cay cua chay tren khuon ep gach ceramics dung chi tieu dg tin cay thi qui trinh mon ciia nhu bing 3.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0.06 0.05 0.05 0.07 0.05 0.05 0.06 0.07 0.04 0.05 0.07 0.06 0.06 0.05 0.07 0.05 0.06 0.05 0.07 0.05 0.07 0.05 0.07 0.06 0.057 0.05 0.07 0.06 0.05 0.04 0.07 0.05 0.07 0.06 0.04 0.07 0.06 0.07 0.07 0.05 0.05 0.06 0.07 0.06 0.07
0.08 0.09 0.07 0.10 0.09 0.08 0.09 0.11 0.08 0.08 0.12 0.10 0.09 0.10 0.12 0.10 0.11 0.09 0.12 0.10 0.11 0.09 0.11 0.11 0.12 0.09 0.12 0.11 0.10 0.09 O.II 0.08 0.11 0.12 0.08 0.10 0.09 0.12 O.II 0.09 0.10 0.11 0.11 0.09 O.II
0.13 0.14 0.14 0.15 0.15 0.14 0.15 0.16 0.14 0.14 0.16 0.15 0.17 0.16 0.16 0.14 0.16 0.14 0.16 0.16 0.16 0.15 0.16 0.16 0.16 0.14 0.17 0.16 0.14 0.13 0.15 0.16 0.14 0.16 0.13 0.16 0.14 0.16 0.16 0 14 0.15 0.14 0.17 0.15 0.16
0.22 0.22 0.21 0.22 0.20 0.20 0.22 0.21 0.22 0.20 0.24 0.21 0.23 0.22 0.20 0.19 0.23 0.19 0.21 0,23 0.21 0.21 0.21 0.21 0.22 0.21 0.24 0.20 0.20 0.21 0.21 0,20 0.19 0.20 0.21 0.22 0.20 0.21 0.22 0.20 0.20 0.21 0.22 0.21 0 22
D6 Due Trung va Dtg Tap chi KHOA HOC & CONG NGHE 173(13): 7 - I I Bang
TT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
2. Thai gian hong do mart vai Ugi = 0 , 2 6 m m
ai 0,00022 0,000230 0,000222 0,000226 0,000217 0,000213 0,000230 0,000222 0,000235 0,000213 0,000248 0,000222 0,000248 0,000239 0,000213 0,000204 0,000243 0,000204 0,000222 0,000248 0,000209 0,000226 0,000222 0,000226 0,000230 0,000222 0,000252 0,000217 0,000213 0,000222 0,000217 0,000222 0,000196 0,000217 0,000222 0,000230 0,000209 0,000222 0,000230 0,000213 0,000217 0,000217 0,000235 0,000222 0,000230
b, 0,00 -0,01 -0,01 0,00 0,00 0,00 0,00 0,01 -0,01 0,00 0,00 0,00 0,00 0,00 0,01 0,00 0,00 0,00 0,01 -0,01 0,01 0,00 0,01 0,00 0,01 0,00 0,00 0,01 0,00 -0,01 0,01 0,00 0,01 0,01 -0,01 0,00 0,00 0,01 0,01 0,00 0,00 0,00 0,01 0,00 0,01
t(i!ia-l 1190,6 1154,3 1208,6 1132,3 1205,2 1239,2 1137,0 1136,5 1158,5 1239,2 1033,0 1163,5 1065,3 1104,0 1164,1 1262,6 1067,9 1272,3 1127,5 1073,3 1197,9 1167,7 1136,5 1132,3 1093,6 1190,6 1015,2 1168,4 1220,4 1208,6 1159,2 1190,6 1267,6 1159,2 1217,6 1110,9 1236,2 1127,5 1102,3 1129,8 1196,0 1177,6 1081,9 1172,5 1102,3 Can Cli vao bang 3 ta co t h i biet truoc d u g c xac suat hong do mon trong khoang thdi gian sii' dung dinh trudc va ngugc lai.
V i d u :
- Muon cho xac suat lam viec tin cay ciia chay tren dat 87,15 % thi chu ky thay thg cua Chiy la T = 1090 gid. Vdi chu ky thay thS nay se c6 13,85% chay tren bi hong do mdn trong thai gian ay.
Hinh 5. Tuyen tinh hda cdc the hien mdn Bang 3. Do tin cay theo thai gian cua Chdy tren
khuon ip ggch ceramics '(gifr)
975 989 997 1009 1025 1035 1046 1060 1076 1090 1096
«W 0.9 0.9975 0,9962 0,9930 0,9865 0,9798 0,9681 0,9478 0,9135 0,8715 0,8500 - T u o n g tir muon xae suat lam vi?c tin cay ciia chay trSn dat 9 9 , 8 8 % thi chu k^- thay thS ciia chay la T = 975 gicr. Voi chu ky thay the nay se co 0,12% chay trSn bi hong d o mon.
N g u p c lai n i u dinh Xraijc chu ky thay the t = 1096 gi6 thi xac suat lam viec tin cay cua Chay
Do Diic Trung vd Dtg Tap chf KHQA HOC & CONG NGHE 173(13): 7 - 1 1 tren se la 8 5 % . Vdi chu ky nay se c6 15% chay
tren bj hdng d o mdn trong thdi gian ay;...
K E T L U A N
Tur nhirng ket qua thyc hien trong nghien ciiu nay, rut ra mgt s6 ket luan sau:
1-Da d u a ra d u g c p h u o n g phap va trinh t u x a c dinh do tin c | y tren c a sd mdn cua chay trgn khuon ep gach Ceramics. Tr^n c a sd phuong phap nay cd th8 xac djnh do tin cay tren c o sd mdn ciia cac chi tiSt khac.
2- X a c dinh d u g c chu ky thay th6 ciia chay tren theo yeu cau do tin cay ciia ngudi sii dyng vdi gia tri dp mdn gidi han l i Ugd = 0 , 2 6 m m .
3 - P h u a n g phap d u g c thyc hien trong nghien ciiu n i y cd t h i dugc ap dung d l xac dinh chu ky Ihay the cho chay ep vdi nhijng gid tri mon gidi han khac nhau.
4. Tr£n c o sd nhung ket qua nghi6n ciiu ciia bai bao nay, chiing tdi sS d^ xuat nhiing giai phap nh5m nang cao tuoi thg cho chay ep trong nhihig nghien ciiu tiep theo.
T A I L I E U T H A M K H A O 1 Birolini Alessandro (2003),Reliabilily
fing/neer/ng, Springer-Verlag, Berlin Heidelbeg.
2. Bill Cong Cuong, Bui minh Tri (1997), Giao trinh xac sudt vd thong ki imgdung, Nxb Giao thong van tai. Ha N6i
3. Luang Anh Dan (2009), Xac dinh do tin cgy tren ca sa mon chay dudi khuon ip ggch caramics, Luan van thac sT ky thuat, Dai hpc KJ thu§t Cong nghigp - Dai hpc Thii Nguyfin.
4. Trin Tuin Di6p, Ly Hoing Tu (1999), Ly thuyit xac sudt vd thdng ke todnhgc, Nha xuat ban Giio due. H i N6i.
5. Nguyen Dinh Min (2014), Xac djnh 35 tin cay tren ca sa mon cua chiy duoi khudn ep gach ceramics ciia nhi miy gach Mikado Thii Binh, Tap chi Khoa hgc cong nghe Dgi hgc Thdi Nguyen,s6 I2,tr.8-12.
6. Nguyin Dinh Man (2006), Xac dinh dp tin cay trin ca sa mon cua sec mang dgng ca Diesel tai nhd may Diesel Song cong Thdi Nguyen, Luan in tiSn sT ky thuit, Dai hoc Bich khoa H i Noi.
7. Phan Quang The, Nguyin Dang Binh (2005), M6n khuon ep gach lit ninceramics va vin dk thiet ke che tao khuon, Tap chi Khoa hoc cong nghe Dgi hgc Thdi Nguyen, so 50, tr. 36-42, 8. D6 Diic Tuin (2003), Nghien cuu xac dinh mot s6 dac trung hao mon chi tietnhom Pittong- Xec ming - Xi lanh dpng ca dau may Diezen sii dung trong nganhdudng sat Vi6t Nam, Tap chi Ca khi Viet Nam, s?> 76, tc. 30-32.
A B S T R A C T
roENTIFING T H E A L T E R N A T I V E C Y C L E F O R T H E B R I C K S H A P E O N W E A R V A L U E O N T H E R E L L \ B I L I T Y R E Q U I R E M E N T
Do Due T r u n g ' , Hoang Tien Dung', Tran Quoc Hung', Nguyen Xuan Dinh^
'Hanoi University of Industry, ^Thai Nguyen College of Industry This paper presents the results of a study to determine the altemative cycle for the brick shape on wear value on the reliability requirement. Experiment was conducted on 45 specimens, each measuring 5 hours, 230 hours, 460 hours, 690 hours and 920 hours at Mikado Thai Binh brick factory to measure the wear value of brick shape and its table. These results determine the altemative cycle for the shape in terms of reliability requirements. Then the direction for fiirther research is also discussed in this paper.
Keywords: alternative cycle, wear base, reliability, brick shape. Mikado Thai Binh brickfactory
Ngay nitgn bai: 12/8/2017; Ngay phdn biin:22/8/2017; Ngay duyitdang: 30/11/2017 Tel- 0988 488691, Email- dotrung.
