- Sir d1,mg aU(YC phucmg phap khoan trong gia c6ng ngw}i.
N{>i dung chinh:
1. ChITc nang ciia cac mfi.i khoan
1. Khai ni$m
De tc;10 nen cac b~ m$t chlm ben trong v~t li$u nhLP lo ren, ranh then, cac lo djnh hlnh, tm&c tien ngLPO'i ta phai c6 mot lo CO' ban. De c6 lo CO' ban ngLPO'i ta dung may khoan (Hlnh 5-1)cung v&i mOi khoan.
Hlnh 5-1 . Cac kieu may khoan.
Tuy theo do l&n cua chi tiet, d$t tf nh cua cong vi$c ma ngLPO'i ta c6 the dung loc;1i may khoan thf ch hqp: may khoan can, may khoan d(rng, may khoan ban, may khoan cam tay, khoan quay tay, khoan lac tay nhLP da trlnh bay & bai 1.
MOi khoan dU'Q'C dung trong gia cong nguoi la mOi khoan ruot ga , lam bang thep d1,.mg Cl,1, thep gi6 hay bang hqp kim c(rng tuy thuoc vao v~t li$u gia cong.
Tuy theo each ga k$p mOi khoan tren may khoan ma mOi khoan c6 chuoi trv ho$c chuoi con.
+MOi khoan chuoi trv c6 chuoi hlnh trv dLP6'ng kfnh bang v&i kf ch thLP&c lo can khoan, tren chuoi c6 ghi cac thong so ky thu~t cua mOi khoan nhLP dLP6'ng kf nh mOi khoan, v~t li$u lam mOi khoan, nhan mac nha che tc;10, MOi khoan chuoi trv dLPQ'C lap tren may thong qua mot bo ph~n k$p gQi la coi k$p mOi khoan . ( Hlnh 5-2)
GEARED DRILL CHUCK
Hlnh 5-2 . MOi khoan chuoi trl,.l va coi kep mOi khoan.
+ MOi khoan chuoi con c6 chuoi hlnh con v&i g6c con dU'Q'C tieu chu~n hoa gQi la con Morse, do;;m hlnh trl,.l & giC!'a IU'oi cat va chuoi c6 ghi cac thong so cua mOi khoan, mOi khoan c6 the dU'Q'C lap tn,l'c tiep tren may ho$c thong qua m(>t ho$c nhieu chi tiet chuyen doi gQi la ao con.( Hlnh 5-3)
DRlll SOCKET
u.ac U> hoid ~ dnl'-. llll-'tff'! •"-OU '°'° lor'w-1 m ft
mtQ f('I~ tf-4 ¢.1111 prn.i ..,,;(ld.11 or • ...,,._
DRIU SLEEVE
Hlnh 5-3 . MOi khoan chuoi con va cac kieu ao con.
2. Ky thuc)t
+ Ga d$t chi tiet
- Ga d$t chi tiet tn,l'c tiep tren ban may
Khi gia cong lo tren may khoan can, may khoan dung va may khoan ban, chi tiet c6 the dU'Q'C d$t tn,ic tiep tren ban may va dU'Q'C kep ch$t nha cac chi tiet kep ch$t la bu long, vau kep ( Hlnh 5-4). Cach ga kep nay vC!'ng chac nhat, nhLI'ng can ILI'U y
thoat mOi khoan khong cha cat vao m$t ban may khi khoan lo thong bang each cha mOi khoan I Qt ranh ban may neu mOi khoan c6 dU'ang kf nh nh6 han ranh ban may ho$c ke chi tiet cao len khoi m$t ban may m(>t khoang thoat mOi khoan.
khoan.
HN>Q'Ct\ MACHlN~
cu,-.,.;,- i..tA.C;'HlNC :,T~AP Cl.A....,
Cac dt,.mg c1,1 ga k~p thU'cmg g~p.
a) k~p dung b) k~p sai
Hlnh 5-4 . Cac d1,1ng c1,1 k~p va each ga k~p chi tiet tn,rc tiep tren ban may khi
- Ga d~t chi tiet thong qua do ga
Tuy theo san IU'qng cua chi tiet gia cong ma ngLI'ai ta dung lo9i do ga thf ch hqp: do ga v9n nang gom c6 cac lo9i e to ho~c do ga chuyen dung
Trang thl,l'c te san xuat ngU'O'i ta thU'ang dung e to de ga k~p cac chi tiet khi khoan, doi v&i e to ngu¢i thl phai lap ch~t tren ban ngu¢i, e to may phai dU'Q'C lap ch~t tren ban may. (Hlnh 5-6)
'• '"· . '"· . . . ' ' --==~~~~~~~'i ' n-- -~ i _
Hinh 5-5 . Cac kieu E t6 thU'ang dung tren may khoan.
INCORRECT CORRECT
•
WORKPIECE
PARALLEL PARAI..U:L
a) sai b) dung
Hlnh 5-6 . Cach ga chi tiet v&i e t6 khi khoan. - M(>t so IU'U y trong ga d~t chi tiet khi khoan
. 0oi v&i cac chi tiet c6 be day nho (mong) de cho qua trinh khoan dU'Q'C de dang va kh6ng gay bien dc;1ng chi tiet gia c6ng ta c6 the kE;lp chi tiet giCl'a hai tam go de khoan.
. Cac chi tiet tron xoay c6 the dU'Q'C ga vao ranh ban may ho~c dunh kho V de kh6ng bi xe djch khi khoan.
+ Mai mOi khoan
Ket cau chung cua mOi khoan ru(>t ga g6m c6 hai ranh xoan each nhau b&i hai me tren c6 mang hai IU'5'i cat hong, ranh xoan tc;10 nen m~t tm&c cua IU'5'i cat chinh cua mOi khoan. Phia m~t d~u cua mOi khoan dU'Q'C mai c6n de tc;10 m~t sau cua IU'5'i cat chinh, giao tuyen cua hai m~t sau cua hai IU'5'i cat O' ngay giCl'a dfnh mOi khoan dU'Q'C gQi la IU'5'i cat ngang, IU'5'i cat ngang gay can tra rat nhieu trong khi cat nhU'ng n6 lu6n c6 b&i vi hai ranh xoan kh6ng the tiep xuc nhau dU'Q'C. ( Hinh 5-7)
C"'.lRILL GEOMETRY A ; CVT11NG UP ANGU: