CN104368856A

CN104368856A - Composite cutter

Info

Publication number: CN104368856A
Application number: CN201310353400.6A
Authority: CN
Inventors: 林柄达
Original assignee: TOPGREEN TECHNOLOGY Co Ltd
Current assignee: TOPGREEN TECHNOLOGY Co Ltd
Priority date: 2013-08-14
Filing date: 2013-08-14
Publication date: 2015-02-25

Abstract

The present invention discloses a composite cutter which comprises a stainless steel or carbon steel cutter handle part and a tungsten steel cutter head part, the two ends of the cutter handle part are respectively provided with a clamping handle body and a cutter rod body, the cutter rod body outer diameter is smaller than the clamping handle body outer diameter, and a convex column is formed on the central part of the end face, a through hole is formed on the central part of the two end faces of the cutter head part in a through-out manner, one end face of the cutter head part is jointed to the end face of the cutter rod body, the inner peripheral surface of the through hole is jointed to the embossment outer peripheral surface of the cutter rod body, by the way, when the composite cutter is used in tapping or milling, the stainless steel or carbon steel cutter rod body is not easy to break, and meanwhile the bonding strength of the joint parts of the cutter handle part and the cutter head part can be increased.

Description

Composite cutter

Technical field

The present invention relates to a kind of cutter, espespecially a kind of composite cutter for tapping or milling.

Background technology

General cutter for cutting can form different cutter head forms according to the difference of function, such as: cutter head be cusp-shaped person mostly be on machined object, form boring cutter, cutter head is that flat-head shape person mostly then is the cutter forming thread or milling on machined object in established hole.For the existing a kind of screw tap cutter forming internal screw thread on machined object in hole, as shown in Figure 5, it includes a stainless steel or carbon steel grip shank 51 and a wolfram steel knife bar 52, knife bar body 520 rear end of knife bar 52 is with welding manner secure bond one end in grip shank 51, the front end of knife bar body 520 is formed with cutter head 521, the thread of tapping is formed on cutter head 521 outer peripheral face, and extend to the outer peripheral face of knife bar body 520 from cutter head 521, be formed with the spiral helicine chip area 522 of multiple tracks.

Existing internal screw thread screw tap cutter is in time using, first grip shank 51 is clamped and fastened on board, hole machined object being wanted tapping is aimed at again with the cutter head 521 of knife bar 52, grip shank 51 is rotated by board, and then making the cutter head 521 of knife bar 52 tapping internal screw thread on the hole wall of hole, during tapping, complementary one-tenth thread thread form is discharged or extruded to the bits material of unnecessary machined object then by chip area 522.

Grip shank 51 is reversed because internal screw thread screw tap cutter must exert a force when tapping, therefore existing grip shank more than 51 adopts stainless steel or the carbon steel material that can bear larger torsion, again for ease of tapping clearly thread on the hole wall to hole on machined object, knife bar more than 52 adopts the wolfram steel material that hardness is higher, whereby to provide good internal screw thread quality and life-span.

But, although existing internal screw thread screw tap cutter is with stainless steel or the resistance to torsion of carbon steel and the hard characteristic of wolfram steel, but the knife bar body of knife bar 52 520 is for coordinating hole aperture on machined object, certain length must be possessed, and with the knife bar body made by the firmly crisp wolfram steel of quality, manyly in the process of merit tooth cannot bear cutter at high speeds and rotate the torsion produced, easily split at the process interrupt of tapping, not only cause the loss of tapping bad and cutter, also easily increase the danger in operation simultaneously.

Because screw tap existing above or milling cutter are in the process to machined object work, the knife bar body of cutter easily ruptures, and therefore causes the problem of thread or milling bad and cutter loss, and be head it off, the present invention proposes a kind of composite cutter.

Summary of the invention

The object of the invention is to propose a kind of composite cutter, in the tapping of machined object work or formed in milling process, the composite cutter of knife bar body not easy fracture can be made, whereby to improve thread or milling quality and life-span, reduce the loss of cutter simultaneously.

Composite cutter of the present invention, includes:

The shank section of one stainless steel or carbon steel, its two ends form a grip shank body and a knife bar body respectively, and the external diameter of this knife bar body is less than the external diameter of this grip shank body, and form a projection in end face central authorities; And

The cutter head portion of one wolfram steel, it runs through formation pass through aperture in both ends of the surface central authorities, and this cutter head portion is engaged on the end face of this knife bar body with an end face, and the inner peripheral surface of this through hole is engaged on the projection outer peripheral face of this knife bar body.

Preferably, the axial length in cutter head portion is less than 1/2nd of the axial length summation in knife bar body and cutter head portion, and knife bar body is formed with multiple tracks knife bar chip area on outer peripheral face, cutter head portion is formed with multiple tracks cutter head chip area on outer peripheral face, and cutter head chip area correspondence is communicated in this knife bar chip area.

By above-mentioned structure, composite cutter of the present invention projection projection on the knife bar body end face of shank section, inserting in the through hole in cutter head portion with projection, the knife bar body of shank section and cutter head portion are not only bonded with each other with end face, the inner peripheral surface of through hole and the outer peripheral face of projection are also bonded with each other, therefore, bond strength and the steadiness of joint can more be increased.

Moreover, the axial length in cutter head portion is less than 1/2nd of the axial length summation in knife bar body and cutter head portion, it is high that the cutter head portion adding wolfram steel has hardness, high torsion can be born with the knife bar body of stainless steel or carbon steel, therefore, cutter in the process to machined object work, even if shank section portion bear compared with large torsion, knife bar body is also not easy thus to rupture, therefore can provide good and stable thread or milling quality and life-span.

Accompanying drawing explanation

The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:

Fig. 1 is stereoscopic figure of the present invention.

Fig. 2 is part sectioned view of the present invention.

Fig. 3 is enlarged fragmentary cross section of the present invention.

Fig. 4 is partial enlargement combination section of the present invention.

Fig. 5 is the stereoscopic figure of existing cutter.

Main element label declaration:

10 cutter 11 shank section

110 grip shank body 111 knife bar bodies

112 projection 113 knife bar chip areas

12 cutter head portion 120 through holes

121 cutter head chip areas

The axial length in L1 cutter head portion

The axial length summation in L2 knife bar body and cutter head portion

51 grip shank 52 knife bars

520 knife bar body 521 cutter heads

522 chip areas

Detailed description of the invention

In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.

Composite cutter of the present invention, please refer to Fig. 1 and Fig. 2, cutter 10 includes shank section 11 and a cutter head portion 12, wherein, this shank section 11 is for stainless steel or carbon steel material is one-body molded makes, two ends form columned grip shank body 110 and a knife bar body 111 respectively, this knife bar body 111 is extended to form by one end of this grip shank body 110, and external diameter is less than the external diameter of this grip shank body 110, formation one projection 112 is protruded in end face central authorities in this knife bar body 111, this projection 112 can be outer peripheral face is formed with the cylindric of at least one abutment face or be polygonal column, and this knife bar body 111 is formed with the spiral helicine knife bar chip area 113 of multiple tracks in outer peripheral face.

This cutter head portion 12 is made by wolfram steel material, formation pass through aperture 120 is run through in both ends of the surface central authorities in this cutter head portion 12, and be formed with multiple tracks helical form cutter head chip area 121 in outer peripheral face, cutter head chip area 121 correspondence is communicated in the knife bar chip area 113 of this knife bar body 111, moreover, the axial length in this cutter head portion 12 is L1, this knife bar body 111 is L2 with the axial length summation in this cutter head portion 12, the axial length L 1 in this cutter head portion 12 is less than 1/2nd (i.e. the L1<1/2L2) of the axial length summation L2 in this knife bar body 111 and this cutter head portion 12.

Please refer to Fig. 3 and Fig. 4, above-mentioned cutter head portion 12 is sheathed on the projection 112 of knife bar body 111 with through hole 120, and utilize the technological means secure bond such as welding, wherein, the end joined in this cutter head portion 12 is in the end face of this knife bar body 111, through hole 120 inner peripheral surface in this cutter head portion 12 is then engaged in projection 112 outer peripheral face of this knife bar body 111, and expand in through hole 120 when welding gas then can be discharged by through hole 120, cutter head portion 12 can closely engage with the joint of knife bar body 111 whereby.

Composite cutter of the present invention, axial length L 1 due to cutter head portion 12 is less than 1/2nd of the axial length summation L2 in knife bar body 111 and cutter head portion 12, add cutter head portion 12 for wolfram steel material, and it is high to have hardness, and the knife bar body 111 of shank section 11 adopts stainless steel or carbon steel material, and have and can bear high torsion characteristics, therefore, cutter 10 of the present invention in use, even if shank section 11 bear compared with large torsion, the knife bar body 111 of stainless steel or carbon steel is also not easy fracture, therefore can provide good and stable thread or milling quality and life-span.

Moreover, the joint in knife bar body 111 of the present invention and cutter head portion 12, except the end face both utilizing is welded to each other except combination, in the projection 112 of knife bar body 111 end face projection insert be bonded with each other in the through hole 120 in cutter head portion 12 fixing, therefore, bond strength and the steadiness of joint can more be increased.

The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.

Claims

1. a composite cutter, is characterized in that, described composite cutter includes:

The shank section of one stainless steel or carbon steel, its two ends form a grip shank body and a knife bar body respectively, and the external diameter of described knife bar body is less than the external diameter of described grip shank body, and form a projection in end face central authorities; And

The cutter head portion of one wolfram steel, it runs through formation pass through aperture in both ends of the surface central authorities, and described cutter head portion is engaged on the end face of described knife bar body with an end face, and the inner peripheral surface of described through hole is engaged on the projection outer peripheral face of described knife bar body.

2. composite cutter as claimed in claim 1, it is characterized in that, the axial length in described cutter head portion is less than 1/2nd of the axial length summation in described knife bar body and described cutter head portion.

3. composite cutter as claimed in claim 1 or 2, it is characterized in that, described knife bar body is formed with multiple tracks knife bar chip area on outer peripheral face, and described cutter head portion is formed with multiple tracks cutter head chip area on outer peripheral face, and described cutter head chip area correspondence is communicated in described knife bar chip area.