CN211991301U

CN211991301U - Tap capable of tapping thin-wall turned threaded hole

Info

Publication number: CN211991301U
Application number: CN202020700779.9U
Authority: CN
Inventors: 方林; 赵钢; 赵�权; 孙卫
Original assignee: Chengdu Xincheng Tools Co ltd
Current assignee: Chengdu Xincheng Tools Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-11-24
Anticipated expiration: 2030-04-30

Abstract

The utility model relates to a can attack screw tap that thin wall turned over screw hole, including the straight shank, correction portion, cutting extrusion, the one end of straight shank is the exposed core, the other end of straight shank is connected with correction portion's one end, correction portion's the other end is connected with cutting extrusion's one end, four chip grooves separate cutting extrusion for first blade in proper order, the second blade, third blade and fourth blade, first blade corresponds the distance between each tooth to the screw tap axis, the second blade corresponds the distance between each tooth to the screw tap axis, the third blade corresponds the distance between each tooth to the screw tap axis, the fourth blade corresponds the distance between each tooth to the screw tap axis and increases gradually. The utility model discloses a two steps of synchronous completions of cutting extrusion, again through the extrusion of hou mian high point after the cutting of first tooth blade trace during the tapping, a back tooth is repeated again and goes on, until accomplishing the tapping, and this tapping mode is all smaller because of cutting and extruded surplus, can prevent that thin-walled hole flanging neck department from splitting and deformation volume too big.

Description

Tap capable of tapping thin-wall turned threaded hole

Technical Field

The utility model relates to a screw tap technical field, especially a can attack screw tap that thin wall turned over screw hole.

Background

The tap is a tool for processing internal threads and can be divided into a cutting tap and an extrusion tap according to a processing mode. The cutting tap is to form an internal thread by cutting through the cutting edge of the tap, and the extrusion tap is to machine the internal thread by using the principle of metal plastic deformation.

In automotive electronic components, a hole is required to be punched in a sheet, as shown in fig. 3, and then an internal thread is required to be punched in the inner wall of the hole in order to fix the component. The existing tap is either a cutting tap or an extrusion tap, and has the following defects for tapping the thin-walled hole flanging parts: 1. the cutting screw tap forms internal threads by cutting the cutting edge, and the hole flanging neck is easily cut off in the tapping process, so that components are scrapped; 2. the extrusion screw tap extrudes the hole flanging, and the hole flanging deforms seriously due to the fact that the wall thickness of the hole flanging is thin, so that components can be scrapped.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming, provide a can attack thin wall and turn over screw tap of hole.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a can attack screw tap of thin wall screw hole, includes the straight handle, the one end of straight handle is the exposed core, still includes correction portion and cutting extrusion portion, the other end of straight handle is connected with the one end of correction portion, the other end of correction portion is connected with the one end of cutting extrusion portion, the outline of cutting extrusion portion is the toper structure, just be provided with four chip grooves along its axial on the lateral wall of cutting extrusion portion, and four chip grooves separate the cutting extrusion portion for first blade, second blade, third blade and fourth blade in proper order, and distance between first blade to the screw tap axis, distance between second blade to the screw tap axis, distance between third blade to the screw tap axis, the distance between fourth blade to the screw tap axis increase gradually.

Further, the straight shank and the correction portion are of an integrally formed structure, and the correction portion and the cutting extrusion portion are of an integrally formed structure.

Further, the correction part is of a cylindrical structure, and the diameter of the large end of the cutting extrusion part is the same as that of the correction part.

Furthermore, the outer profile taper of the cutting extrusion part is 1: 8-10.

The utility model has the advantages of it is following:

1. the utility model discloses specially adapted thin-walled hole flanging processes the internal thread, adopts cutting extrusion portion to the preliminary cutting extrusion processing of thin-walled hole flanging earlier, and four blades apart from the screw tap axis crescent for the preliminary formation of internal thread profile is formed by the substep cutting, and after cutting extrusion portion tapping was accomplished, extrudees the internal thread profile of preliminary formation once more by the correction portion again, finally forms the internal thread profile. By adopting a tapping mode of half cutting and half extruding, the breakage of the hole flanging of the thin wall at the neck part can be prevented, and the serious deformation caused by the excessive extruding of the hole flanging of the thin wall can be prevented.

2. The tapping method is characterized in that cutting and extrusion are synchronously completed in two steps, a first tooth cutting edge is subjected to micro-cutting and then extruded through a rear high point during tapping, a later tooth is repeatedly performed until tapping is completed, and the tapping mode is small in allowance due to cutting and extrusion, so that breakage and overlarge deformation of a hole flanging neck part of a thin wall can be prevented.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic structural diagram of a hole flanging on a sheet of an automotive electronic component;

in the figure: 1-straight shank, 2-correcting part, 3-cutting extrusion part, 3 a-first cutting edge, 3 b-second cutting edge, 3 c-third cutting edge, 3 d-fourth cutting edge and 4-chip groove.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.

As shown in figures 1 and 2, the tap capable of tapping the thin-wall turned threaded hole comprises a straight shank 1, wherein one end of the straight shank 1 is a clamping end, a correcting part 2 and a cutting extrusion part 3, the other end of the straight shank 1 is connected with one end of a correcting part 2, the other end of the correcting part 2 is connected with one end of a cutting and extruding part 3, the outer contour of the cutting and extruding part 3 is in a conical structure, and four chip grooves 4 are arranged on the side wall of the cutting extrusion part 3 along the axial direction of the cutting extrusion part, the cutting extrusion part 3 is sequentially divided into a first cutting edge 3a, a second cutting edge 3b, a third cutting edge 3c and a fourth cutting edge 3d by the four chip grooves 4, and the distance from the first cutting edge 3a to the axis of the screw tap, the distance from the second cutting edge 3b to the axis of the screw tap, the distance from the third cutting edge 3c to the axis of the screw tap and the distance from the fourth cutting edge 3d to the axis of the screw tap are gradually increased. The thin-wall hole flanging and tapping are completed in two steps, the hole flanging is initially tapped by the cutting and extruding part 3, and then the initially formed internal thread is finally extruded and formed by the correcting part 2. And the cutting extrusion part 3 adopts a progressive mode to carry out cutting extrusion forming on the thread profile step by step during cutting extrusion tapping, so that the phenomenon that the hole flanging neck part of the thin wall is broken due to overlarge tool consumption can be prevented. The correction portion 2 is formed by extrusion again after tapping the cutting extrusion portion 3, and the amount of deformation required for extrusion is reduced.

Furthermore, the straight shank 1 and the correction part 2 are integrally formed, and the correction part 2 and the cutting extrusion part 3 are integrally formed. That is to say, the straight shank 1, the correcting part 2 and the cutting extrusion part 3 are integrally formed, so that the strength is higher, and the condition that the tap is broken in the tapping process is prevented.

Further, the correction portion 2 is a cylindrical structure, and the diameter of the large end of the cutting and pressing portion 3 is the same as that of the correction portion 2. The preliminary internal thread tapped by the cutting extrusion part 3 is transited to be continuously extruded and formed by the correction part 2.

Furthermore, the outer profile taper of the cutting extrusion part 3 is 1: 8-10. The taper of the cutting extrusion part 3 is not too large, and too large taper can cause too large cutting amount.

The working process of the utility model is as follows: when the hole flanging internal thread of processing thin wall, fix components and parts earlier, cutting extrusion portion 3 through the screw tap carries out preliminary internal thread cutting extrusion processing to the hole flanging inner wall earlier, first cutting extrusion is accomplished to the hole flanging inner wall to first blade 3a, second blade 3a immediately after it cuts the extrusion once again on the basis of cutting for the first time, analogize with this, accomplish the cutting extrusion until fourth blade 3d, realize progressive cutting extrusion processing step by step, the cutting amount of thread processing has been reduced, after preliminary internal thread hole forms, continue to adopt correction portion 2 to carry out extrusion to it, because there is preliminary internal thread hole, correction portion 2 is when extrusion processing, required deformation volume will be very little, correction portion 2 further extrudees preliminary internal thread hole, form thin-walled hole flanging structure finally.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a can attack screw tap that thin wall turned over screw hole, includes straight handle (1), the one end of straight handle (1) is the exposed core, its characterized in that: the device also comprises a correction part (2) and a cutting and extruding part (3), the other end of the straight shank (1) is connected with one end of the correction part (2), the other end of the correcting part (2) is connected with one end of the cutting extrusion part (3), the outer contour of the cutting extrusion part (3) is of a conical structure, and four chip grooves (4) are formed in the side wall of the cutting extrusion part (3) along the axial direction of the cutting extrusion part, the cutting extrusion part (3) is sequentially divided into a first cutting edge (3 a), a second cutting edge (3 b), a third cutting edge (3 c) and a fourth cutting edge (3 d) by the four chip grooves (4), and the distance from the first cutting edge (3 a) to the axis of the screw tap, the distance from the second cutting edge (3 b) to the axis of the screw tap, the distance from the third cutting edge (3 c) to the axis of the screw tap and the distance from the fourth cutting edge (3 d) to the axis of the screw tap are gradually increased.

2. The tap according to claim 1, wherein said tap is characterized in that: the straight shank (1) and the correction part (2) are of an integrally formed structure, and the correction part (2) and the cutting extrusion part (3) are of an integrally formed structure.

3. The tap according to claim 1, wherein said tap is characterized in that: the correcting part (2) is of a cylindrical structure, and the diameter of the large end of the cutting extrusion part (3) is the same as that of the correcting part (2).

4. The tap according to claim 1, wherein said tap is characterized in that: the outer profile taper of the cutting extrusion part (3) is 1: 8-10.