CN104368856A - Compound tool - Google Patents

Abstract

The composite cutter comprises a stainless steel or carbon steel handle part and a tungsten steel cutter head part, wherein the two ends of the cutter handle part are respectively provided with a clamping handle body and a cutter rod body, the outer diameter of the cutter rod body is smaller than that of the clamping handle body, a convex column is formed in the center of the end surface, a through hole is formed in the center of the two end surfaces of the cutter head part in a penetrating mode, one end surface of the through hole is connected to the end surface of the cutter rod body, and the inner circumferential surface of the through hole is connected to the outer circumferential surface of the convex column of the cutter rod body.

Description

Compound tool

technical field

The invention relates to a tool, especially a compound tool for thread tapping or milling.

Background technique

Generally, cutting tools will form different cutter head shapes according to different functions. For example, those with a pointed head are mostly used to form drilling tools on the workpiece, and those with a flat head are mostly used for processing. A tool for forming threads or milling in a hole that has been formed on an object. Take an existing thread tapping tool that forms internal threads in holes on workpieces as an example, as shown in Figure 5, it includes a stainless steel or carbon steel clamping handle 51 and a tungsten steel tool bar 52, The rear end of the cutter bar body 520 of the cutter bar 52 is fixedly combined with one end of the clamping handle 51 by welding, the front end of the cutter bar body 520 is formed with a cutter head 521, and a screw thread for tapping is formed on the outer peripheral surface of the cutter head 521, and Extending from the cutter head 521 to the outer peripheral surface of the cutter body 520 , a plurality of spiral flutes 522 are formed.

When the existing internal screw thread tapping tool is in use, the clamping handle 51 is clamped and fixed on the machine table first, and then the cutter head 521 of the tool bar 52 is aligned with the hole to be tapped on the workpiece, and the machine tool is passed through the machine. The table rotates the clamping handle 51, so that the cutter head 521 of the tool bar 52 taps the internal thread on the hole wall, and the excess chips of the workpiece are discharged from the chip removal groove 522 or squeezed into complementary threads during tapping. Thread shape.

Because the internal screw thread tapping tool must apply force to twist the clamping handle 51 when tapping, so the existing clamping handle 51 is mostly made of stainless steel or carbon steel that can withstand a large torque, and in order to facilitate the clamping of the workpiece. Clear thread is tapped on the wall of the hole, and the tool bar 52 is mostly made of tungsten steel with high hardness, so as to provide good quality and service life of the internal thread.

However, although the existing internal thread tapping tool has the characteristics of stainless steel or carbon steel torsion resistance and tungsten steel hardness, the tool body 520 of the tool bar 52 must have a certain length to match the hole diameter on the workpiece. However, the tool body made of hard and brittle tungsten steel cannot bear the torsion force generated by the high-speed rotation of the tool during the tapping process, and it is easy to break during the tapping process, which not only causes poor tapping quality and loss, but also easy to increase the risk of operation.

Because the above-mentioned existing tapping or milling tools work on the workpiece, the cutter body of the tool is easy to break, thus causing the problems of poor thread or milling quality and tool loss. In order to solve this problem, the present invention proposes A compound tool.

Contents of the invention

The object of the present invention is to propose a compound tool, which can make the tool body not easy to break during the process of tapping or forming milling on the workpiece, thereby improving the quality and life of the thread or milling. At the same time reduce the loss of tools.

Compound cutter of the present invention comprises:

A handle made of stainless steel or carbon steel, the two ends of which respectively form a clamping handle body and a knife shank body, the outer diameter of the knife shank body is smaller than the outer diameter of the clamping shank body, and a convex column is formed in the center of the end face; as well as

A cutter head made of tungsten steel, which penetrates to form a through hole in the center of both ends, the cutter head is joined to the end face of the cutter body with one end face, and the inner peripheral surface of the through hole is joined to the protrusion of the cutter body. on the outer circumference of the column.

Preferably, the axial length of the cutter head is less than 1/2 of the sum of the axial lengths of the cutter body and the cutter head, and the cutter body is formed with multiple cutter bar chip removal grooves on the outer peripheral surface, and the cutter head A plurality of cutter head chip removal grooves are formed on the outer peripheral surface, and the cutter head chip removal grooves are correspondingly connected to the cutter bar chip removal grooves.

Through the above structure, the composite cutter of the present invention protrudes a protruding column on the end surface of the knife shank body of the knife handle, and inserts the convex column into the through hole of the knife head, so that the knife shank body of the knife handle and the knife head are not only The end surfaces are joined to each other, and the inner peripheral surface of the through hole and the outer peripheral surface of the protruding post are also joined to each other, so the bonding strength and stability of the joint can be further increased.

Furthermore, the axial length of the cutter head is less than 1/2 of the sum of the axial lengths of the cutter body and the cutter head. In addition, the cutter head made of tungsten steel has high hardness. The shank can withstand high torsion. Therefore, when the tool is working on the workpiece, even if the shank of the tool bears a relatively large torsion, the shank is not easy to break, so it can provide good and stable thread or milling. quality and longevity.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Fig. 1 is a perspective view of the appearance of the present invention.

Fig. 2 is a partial sectional view of the present invention.

Fig. 3 is a partially enlarged sectional view of the present invention.

Fig. 4 is a partially enlarged combined sectional view of the present invention.

Fig. 5 is an external perspective view of a conventional cutter.

Explanation of main component labels:

10 Knife 11 Tool handle

110 Clamping handle body 111 Tool holder body

112 Boss post 113 Tool bar flute

12 cutter head 120 through hole

121 Cutter head flutes

L1 Axial length of cutter head

L2 The sum of the axial lengths of the tool body and the tool head

51 Clamping handle 52 Tool holder

520 Tool body 521 Tool head

522 Flutes

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

Please refer to Fig. 1 and Fig. 2 for the composite cutter of the present invention. The cutter 10 includes a handle 11 and a head 12, wherein the handle 11 is integrally formed of stainless steel or carbon steel, and the two ends are respectively A cylindrical clamping handle body 110 and a cutter body 111 are formed, the cutter rod body 111 is formed by extending from one end of the clamping handle body 110, and the outer diameter is smaller than the outer diameter of the clamping handle body 110, on the cutter rod body 111 The center of the end surface protrudes to form a boss 112, the boss 112 can be cylindrical or polygonal with at least one abutment surface formed on the outer peripheral surface, and the tool body 111 is formed with multiple spirals on the outer peripheral surface Arbor flutes 113.

The cutter head 12 is made of tungsten steel, a through hole 120 is formed in the center of both ends of the cutter head 12, and a plurality of spiral chip removal grooves 121 are formed on the outer peripheral surface of the cutter head for chip removal. The groove 121 is corresponding to the chip removal groove 113 of the cutter body 111. Furthermore, the axial length of the cutter head 12 is L1, and the sum of the axial lengths of the cutter body 111 and the cutter head 12 is L2. The axial length L1 of the cutter head 12 is less than half of the sum L2 of the axial lengths of the cutter body 111 and the cutter head 12 (ie L1<1/2L2).

Please refer to FIG. 3 and FIG. 4, the above-mentioned cutter head 12 is sleeved on the boss 112 of the cutter body 111 through the through hole 120, and is fixedly combined by welding and other technical means, wherein the end surface of the cutter head 12 is joined to the The end surface of the cutter body 111 and the inner peripheral surface of the through hole 120 of the cutter head 12 are joined to the outer peripheral surface of the boss 112 of the cutter body 111, and the gas expanded in the through hole 120 during welding can be discharged through the through hole 120 , so that the junction of the cutter head 12 and the cutter body 111 can be more closely engaged.

In the composite tool of the present invention, since the axial length L1 of the cutter head 12 is less than one-half of the sum L2 of the axial lengths of the cutter body 111 and the cutter head 12, and the cutter head 12 is made of tungsten steel, And have hardness height, and the knife bar body 111 of knife handle portion 11 adopts stainless steel or carbon steel material, and have can bear high torsion force characteristic, therefore, when cutting tool 10 of the present invention is in use, even if knife handle portion 11 bears larger torsion force , the tool body 111 made of stainless steel or carbon steel is not easy to break, so it can provide good and stable thread or milling quality and life.

Furthermore, in the junction of the cutter body 111 and the cutter head 12 of the present invention, in addition to using the end faces of the two to weld each other, the protruding post 112 protruding from the end face of the cutter rod body 111 is inserted into the through hole 120 of the cutter head 12 The joints are fixed to each other, so the joint strength and stability of the joint can be increased.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (3)

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.