CN1141832A

CN1141832A - Internal-cooling bit of drill

Info

Publication number: CN1141832A
Application number: CN 94112495
Authority: CN
Inventors: 张孝敬
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-30
Filing date: 1994-08-30
Publication date: 1997-02-05
Anticipated expiration: 2014-08-30
Also published as: CN1057036C

Abstract

The inner-cooled type drill bit comprises a cutter arbor body, a replaceable cutter block fixed on top end of cutter arbor body, an axial center hole is cut in the interior of the cutter arbor body, one end of the axial center hole is connected with water inlet positioned on the side surface of the cutter arbor body, and another end is connected with the back face of the cutter edge of the replaceable cutter block. Said drill bit has the inner-cooling function, can be used for continuously drilling, and its service life is long, efficiency and machining accuracy are high.

Description

Internal-cooling bit of drill

The present invention relates to employed a kind of cutter in the mechanical processing process, especially a kind of drill bit.

In mechanical processing industry, drill bit is a kind of cutter that often uses, wherein the most normal use be spiral bit, in order to improve cutting power and operating efficiency, present a kind of interchangeable cutter head formula drill bit also, be called drill bit with cutting tip as Patent Office of the People's Republic of China's invention disclosed name on October 27th, 1, publication number is CN1077670A, the drill bit of this structure, though overcome some disadvantages of spiral bit, but still have following shortcoming: cooling fluid must be to be sprayed directly on on the drill bit in working angles, when drilling depth reaches 30 millimeters, cools off extremely insufficient, the drill edge part almost can not get cooling, the heat that cutting is produced can not spread out of fast, makes the blade temperature raise the reddening deliquescing, the operator is in order to make drill bit energy operate as normal, must frequently withdraw from drill bit, continue boring after the cooling again, so cutting speed be slow, efficient is low.Bit wear is fast, the life-span is short, and labour intensity is big, crudy is poor.

The purpose of this invention is to provide a kind of internal-cooling bit of drill that can cool off automatically at drill bit internal.

Technical solution of the present invention is: a kind of internal-cooling bit of drill, and it comprises the knife bar body; But be fixed on the tool changing piece of knife bar body termination, it is characterized in that an axial center hole is arranged in the knife bar body, the inlet opening on the side of axial center hole one end and knife bar body communicates, but the other end leads to the blade back on the tool changing piece.

The present invention compared with prior art owing to be processed with centre bore at the axial line place of knife bar body, an end of centre bore communicates with inlet opening on the knife bar body side surface, but and the other end leads to the major cutting edge back on the tool changing piece; Therefore in drilling process, charge into water (or other cooling fluid) from the place, inlet opening, but and by flowing out near the major cutting edge of centre bore to the tool changing piece, reach the purpose of cooling drill bit blade, so the present invention has interior cold function, guaranteed the cooling of blade, drilling continuously, improve drill bit service life, increase work efficiency, reduce labor intensity, guaranteed machining accuracy.

Below in conjunction with the drawings and the specific embodiments the present invention is described in further detail:

Fig. 1 is the specific embodiment of the invention (main a looking) structural representation;

Fig. 2 is the drill bit blade cutaway view in the specific embodiment of the invention;

But Fig. 3 is the front view of tool changing piece 3;

Fig. 4 is the leading section front view of knife bar body 1;

Fig. 5 is a vertical view shown in Figure 4;

Fig. 6 is a left view shown in Figure 4.

Shown in Fig. 4,6: the front end at knife bar body 1 is processed with a transverse concave groove 11, but tool changing piece 3 is complementary with groove 11 and places in the groove 11, but tool changing piece 3 also is provided with a boss 7, circular hole 12 couplings on boss 7 and the knife bar body 1, be respectively equipped with screw on the

side wing

8,9 of groove 11 both sides, but use screw 4 that tool changing piece 3 is fixed in the groove 11.

Shown in Fig. 1,2,3,6: in inlet opening 2 of processing, the side of knife bar body 1, the axial line place is processed with a centre bore 10, the termination of centre bore 10 communicates with inlet opening 2, but the other end leads to the middle part (referring to Fig. 1,2) of tool changing piece 3, but two major cutting edge back on the tool changing piece 3 are processed with cooling hole 5,6, and centre bore 10 (referring to Fig. 3) is led in cooling hole 5,6.

If lathe uses, the fluid hole and the inlet opening 2 of cooling device joined in the employing straight connector; If drilling machine uses, adopt sliding sleeve that the fluid hole of cooling device and inlet opening 2 are joined and get final product.

But on two cutting edge C of tool changing piece 3, have chip dividing groove A.The two sides of chisel edge has crescent B, has reduced the length of chisel edge, thereby has reduced cutting resistance.

The present invention is not only limited to above-mentioned embodiment, and any possible embodiment all belongs to basic thought of the present invention.

Claims

1, a kind of internal-cooling bit of drill, it comprises knife bar body [1], is fixed on knife bar body [1] but the tool changing piece [3] of termination, it is characterized in that: an axial center hole [10] is arranged in knife bar body [1], inlet opening [2] on the side of axial center hole [10] one ends and knife bar body [1] communicates, but the other end leads to the blade back on the tool changing piece [3].