CN215091153U

CN215091153U - Composite welding type screw tap head

Info

Publication number: CN215091153U
Application number: CN202121592555.1U
Authority: CN
Inventors: 关红波
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2021-12-10
Anticipated expiration: 2031-07-13

Abstract

The utility model provides a composite welding type screw tap head, including conical head axle core and three at least tapping sheetmetals, the hardness of conical head axle core is less than the hardness of tapping sheetmetal, the tapping sheetmetal is alternate and even welds in the lateral wall of conical head axle core, the lateral wall of tapping sheetmetal is along the circumference circular arc bending of conical head axle core, the outer wall of tapping sheetmetal grinds tapping screw thread, conical head axle core has seted up the relief groove between two adjacent tapping sheetmetals, the side edge of tapping sheetmetal sets up the cutting edge; the lower end of the tapping metal sheet is provided with inclined planes which extend outwards and upwards from the lower end of the inner wall of the tapping metal sheet, and at least three inclined planes form a cutting part. The utility model discloses an alternate and even welding of tapping sheetmetal in thereby the tap axial core's lateral wall can guarantee the normal cutting of tapping sheetmetal high rigidity and tapping, can select the lower tap axial core of hardness again, avoids making the condition of the rupture that the material becomes fragile and takes place because hardness is high to increase the life of screw tap.

Description

Composite welding type screw tap head

Technical Field

The utility model relates to a machining accessory field especially relates to a hybrid welding formula tap.

Background

The tap is a tool for processing various internal threads with medium and small sizes, has simple structure and convenient use, can be manually operated and can also work on a machine tool, and has wide application in production. The working portion of the tap includes a cutting taper and a tapping thread portion.

The working parts of the existing screw tap are made of one material, and the cutting conical part and the tapping thread part need high hardness, but the high hardness inevitably causes the material to be brittle and easy to break, so that the service life of the screw tap is limited to a certain extent.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hybrid welding formula screw tap head to solve above-mentioned technical problem.

In order to realize the purpose, the technical scheme of the utility model is that: the composite welding type screw tap head comprises a conical head shaft core and at least three tapping metal sheets, wherein the hardness of the conical head shaft core is lower than that of the tapping metal sheets, the tapping metal sheets are alternately and uniformly welded on the outer side wall of the conical head shaft core, the outer side wall of each tapping metal sheet is bent along the circumferential arc of the conical head shaft core, the central axis of the arc where the outer side wall of each tapping metal sheet is located is overlapped with the central axis of the conical head shaft core, tapping threads are ground on the outer wall of each tapping metal sheet, a discharge groove is formed between every two adjacent tapping metal sheets of the conical head shaft core, and cutting edges are formed on the side edges of the tapping metal sheets; the lower end of the tapping metal sheet is provided with inclined planes which extend outwards and upwards from the lower end of the inner wall of the tapping metal sheet, and at least three inclined planes form a cutting part.

Preferably, the depth of the discharge chute is greater than or equal to the thickness of the tapping metal sheet.

Preferably, the number of the tapping metal sheets is three or four or five.

Preferably, the lower end of the tapping metal sheet is flush with the lower end of the tap head shaft core.

The utility model discloses an alternate and even welding of tapping sheetmetal in the lateral wall of conical head axle core, conical head axle core's hardness is less than the hardness of tapping sheetmetal, and conical head axle core and tapping sheetmetal can select different materials according to actual conditions, thereby can guarantee tapping sheetmetal high rigidity normal cutting and tapping, can suitably reduce conical head axle core's hardness again, avoid because the high condition that makes the material become fragile and the rupture that takes place of hardness to increase the life of screw head.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings which illustrate embodiments of the invention.

Drawings

Fig. 1 is a structural diagram of an angle of the composite welding type tap head of the utility model.

Fig. 2 is a structural diagram of another angle of the composite welding type tap head of the present invention.

Detailed Description

Referring to fig. 1 and 2, the composite welding type tap head 100 of the present invention includes a tap axial core 10 and at least three tapping metal sheets 20. The tapping metal sheets 20 are alternately and uniformly welded to the outer side wall of the cone head spindle 10, in this embodiment, the welding manner between the tapping metal sheets 20 and the outer side wall of the cone head spindle 10 is atomic welding. The outer side wall of the tapping metal sheet 20 is bent along a circumferential arc of the conical head shaft core 10, and the central axis of the arc where the outer side wall of the tapping metal sheet 20 is located is overlapped with the central axis of the conical head shaft core 10. Tapping threads (not shown) are ground on the outer wall of each tapping metal sheet 20, a discharge groove 21 is formed between every two adjacent tapping metal sheets 20, and a cutting edge 22 is formed on the side edge, opposite to the discharge groove 21, of each tapping metal sheet 20; the lower end of the tapping metal sheet 20 is provided with inclined surfaces 23 extending outward and upward from the lower end of the inner wall of the tapping metal sheet 20, and at least three of the inclined surfaces 23 form cutting portions. The tapping metal piece 20 is a metal having high hardness, such as tungsten steel or diamond. The cone head core 10 is also made of metal, and the hardness of the cone head core 10 is lower than that of the tapping metal sheet 20.

Preferably, the depth of the discharge chute 21 is equal to or greater than the thickness of the tapped metal piece 20.

The number of the tapping metal sheets 20 is three or four or five. In this embodiment, the number of the tapping metal sheets 20 is three.

Preferably, the lower end of the tapping metal sheet 20 is flush with the lower end of the tap core 10.

The utility model discloses alternate and even welding of tapping sheetmetal of hybrid welding formula screw tap head in the lateral wall of awl head axle core, the hardness of awl head axle core is less than the hardness of tapping sheetmetal, and different materials can be selected according to actual conditions to awl head axle core and tapping sheetmetal, thereby can guarantee tapping sheetmetal high rigidity normal cutting and tapping, can suitably reduce the hardness of awl head axle core again, avoid the condition of the rupture that takes place because hardness height makes the material become fragile to increase the life of screw tap head.

It should be noted that the number of the tapping metal sheets 20 may be five or more than three, four or five than the above-mentioned tapping metal sheets; the tapping metal sheet 20 may be made of other suitable materials besides tungsten steel or diamond.

The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and various modifications, equivalent combinations, which are made according to the essence of the present embodiment, should be covered.

Claims

1. The utility model provides a hybrid welding formula screw tap head which characterized in that: the taper head shaft core is lower in hardness than the tapping metal sheets, the tapping metal sheets are alternately and uniformly welded on the outer side wall of the taper head shaft core, the outer side wall of each tapping metal sheet is bent along a circumferential arc of the taper head shaft core, the central axis of the arc where the outer side wall of each tapping metal sheet is located is overlapped with the central axis of the taper head shaft core, tapping threads are ground on the outer wall of each tapping metal sheet, a discharge groove is formed between every two adjacent tapping metal sheets of the taper head shaft core, and cutting edges are formed in the side edges of the tapping metal sheets; the lower end of the tapping metal sheet is provided with inclined planes which extend outwards and upwards from the lower end of the inner wall of the tapping metal sheet, and at least three inclined planes form a cutting part.

2. The hybrid welding-type tap head of claim 1, wherein: the depth of the discharge groove is larger than or equal to the thickness of the tapping metal sheet.

3. The hybrid welding-type tap head of claim 1, wherein: the number of the tapping metal sheets is three or four or five.

4. The hybrid welding-type tap head of claim 1, wherein: the lower end of the tapping metal sheet is flush with the lower end of the tap head shaft core.