CN220533160U - Extrusion tap - Google Patents

Abstract

An extrusion tap comprises a cutter handle, a tapping head and a cutting shaping head; the tapping head comprises a supporting rod and tapping threads, the supporting rod is arranged at one end of the tool shank, the tapping threads are arranged on the supporting rod, and the tapping threads are used for extruding internal threads of the threaded holes when the tool shank drives the supporting rod to rotate along a first direction; the cutting shaping head is arranged at one end of the supporting rod, which is away from the tool handle, and is used for cutting and shaping the internal threads formed by extrusion of the tapping screw teeth when the tool handle drives the supporting rod to rotate along the second direction. According to the extrusion tap, the tapping head is arranged, and when the handle drives the supporting rod to rotate along the first direction, the tapping screw teeth can extrude and form the internal threads of the threaded holes; through setting up the cutting plastic head and driving the bracing piece and cutting the plastic to the internal thread when rotating along the second direction at the handle of a knife, can make the height of the tooth mountain of internal thread keep unanimous to reduce or eliminate the tooth mouth, thereby effectively controlled the size of internal thread and tooth mouth, improved the machining precision to the internal thread.

Description

Extrusion tap

Technical Field

The application relates to the technical field of internal thread forming tools, in particular to an extrusion tap.

Background

The extrusion tap is a novel thread cutter for processing the internal thread of the threaded hole by utilizing the plastic deformation principle of plastic materials. When an internal thread is formed by extrusion of a current extrusion tap, a plastic material forms a thread ridge of the internal thread under the extrusion of the extrusion tap, and materials on two sides of the thread ridge are close to the crest of the thread ridge and inevitably form a notch in the shape of a crater, which is called a crater. Because the extrusion tap is used for processing the internal thread, the internal thread is formed in one step, and the deformation of the plastic material has certain randomness, the size of the internal thread and the size of the tooth mouth are difficult to control, so that the processing precision of the internal thread is influenced, when the size difference of the internal thread is large or the size of the tooth mouth is overlarge, the normal use of the internal thread can be influenced, for example, when the size difference of the internal thread is large, the normal matching of the external thread and the internal thread can be influenced; when the size of the tooth mouth is too large, the external thread is easy to lock and clip into the tooth mouth when being matched with the internal thread, thereby causing the problem of locking of the screw teeth.

Disclosure of Invention

In view of the foregoing, it is necessary to provide an extrusion tap for effectively controlling the dimensions of the internal thread and the tooth mouth and improving the processing accuracy of the internal thread.

The embodiment of the application provides an extrusion tap, which comprises a cutter handle, a tapping head and a cutting shaping head; the tapping head comprises a supporting rod and tapping screw teeth, the supporting rod is arranged at one end of the tool handle, the tapping screw teeth are arranged on the supporting rod, and the tapping screw teeth are used for extruding internal threads of threaded holes when the tool handle drives the supporting rod to rotate along a first direction; the cutting shaping head is arranged at one end of the supporting rod, which is away from the tool handle, and is used for cutting and shaping the internal threads formed by extrusion of the tapping screw teeth when the tool handle drives the supporting rod to rotate along a second direction, wherein the second direction is opposite to the first direction.

Above-mentioned extrusion tap includes bracing piece and tapping screw tooth through setting up the tapping head, and when the handle of a knife drove the bracing piece along first direction rotation, the internal thread that the tapping screw tooth can extrusion screw hole because the tapping head is the internal thread that utilizes plastic material's plastic deformation principle extrusion screw hole, consequently can not destroy plastic material's crystalline phase fibre to be favorable to improving the tooth face hardening degree and the anti cutting strength of internal thread. Through setting up the cutting plastic head and driving the bracing piece and cutting the plastic to the internal thread when rotating along the second direction at the handle of a knife, can make the height of the tooth mountain of internal thread keep unanimous to reduce or eliminate the tooth mouth, thereby effectively controlled the size of internal thread and tooth mouth, improved the machining precision to the internal thread.

In some embodiments, the cutting shaper head comprises a support portion, a first cutting edge portion, and a second cutting edge portion; the supporting part is arranged at one end of the supporting rod, which is away from the knife handle; the first cutting edge part and the second cutting edge part are symmetrically arranged on the supporting part, and the first cutting edge part and the second cutting edge part are used for cutting and shaping the internal thread.

In some embodiments, the supporting portion is provided with a first temporary storage groove and a second temporary storage groove which are symmetrically arranged, the first temporary storage groove is located on one side of the first cutting edge portion, the second temporary storage groove is located on one side of the second cutting edge portion, and the first temporary storage groove and the second temporary storage groove are respectively used for temporarily storing chips formed by cutting and shaping of the first cutting edge portion and the second cutting edge portion.

In some embodiments, the first cutting edge portion and the second cutting edge portion are each provided obliquely to the support portion, and an angle of inclination of the first cutting edge portion and the second cutting edge portion is the same as an angle of inclination of the tapping screw.

In some embodiments, the diameter of the cutting shaper head is greater than the diameter of the support rod and less than the diameter of the tapping thread.

In some embodiments, the support rod is provided with a plurality of lubrication grooves arranged at intervals, the extending direction of the lubrication grooves is the same as that of the support rod, the tapping screw threads are divided into a plurality of parts which are not connected with each other by the plurality of lubrication grooves, the plurality of lubrication grooves are used for injecting lubrication liquid when the tapping screw threads are extruded to form the internal threads, and for discharging scraps formed by cutting and shaping the internal threads by the cutting and shaping head.

In some embodiments, the support bar includes a tapped load-bearing section and a drain section; the tapping screw teeth are arranged on the tapping bearing section; the both ends of excreteing the section respectively with the handle of a knife with tapping bears the section and is connected, many lubrication groove by excreteing the section and extend to tapping bears the section, excreteing the section and be used for many lubrication groove reservation drainage space.

In some embodiments, the tapping thread comprises a guide and a tap; the guide part is arranged at one end of the support rod, which is close to the cutting shaping head; the tapping part is arranged on the supporting rod and is positioned on one side, away from the cutting shaping head, of the guiding part, the tapping part is used for extrusion molding of the internal thread, and the guiding part is used for guiding the tapping part.

In some embodiments, the guide portion has a cross-section that gradually decreases in size in a direction away from the shank.

In some embodiments, an end of the handle remote from the support bar has a connecting portion with a limiting surface.

Drawings

Fig. 1 is a schematic perspective view of an extrusion tap according to an embodiment of the present application.

Fig. 2 is an enlarged schematic view of the extrusion tap shown in fig. 1 at ii.

Fig. 3 is a schematic front view of the extrusion tap of fig. 1.

Fig. 4 is a schematic diagram showing a comparison of the cutting and shaping head of the embodiment of the present application before and after cutting and shaping the thread ridge of the internal thread.

Description of the main reference signs

Extrusion tap 100

Knife handle 10

Connection part 11

Limiting surface 111

Body 12

Transition 13

Tapping head 20

Support bar 21

Drain section 211

Tapping load-bearing section 212

Lubrication groove 213

Tapping screw 22

Tapping portion 221

Guide 222

Cutting and shaping head 30

Support portion 31

First temporary storage groove 311

Second temporary storage groove 312

First cutting edge portion 32

Blade 321

Second cutting edge portion 33

First direction 40

Second direction 50

Center line 60

Internal thread 200

Dental mountain 210

Crest 2101

Tooth mouth 2102

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "orientation" or "positional relationship" as used herein are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, it is to be noted that the meaning of "a plurality" is two or more, unless specifically defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be connected in a mechanical mode, can be electrically connected or can be communicated with each other, can be directly connected, can be indirectly connected through an intermediate medium, and can be communicated with each other inside the two components or can be in interaction relation with each other. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present application provides an extrusion tap 100 including a shank 10, a tap head 20, and a cutting and shaping head 30.

Referring to fig. 1 and 4, the extrusion tap 100 of the present embodiment is used for being mounted on a driving device (not shown), and for machining an internal thread 200 of a threaded hole (not shown) in a plastic material (not shown) under the driving of the driving device, wherein the driving device may be a tapping machine, a machining center, a numerically controlled lathe, etc., the plastic material may be a material with low hardness and high plasticity such as copper alloy, aluminum alloy, stainless steel, low carbon steel, etc., and the threaded hole may be a blind hole, a through hole, etc. For ease of understanding and description, the embodiments of the present application are described with the driving apparatus as a machining center, the plastic material as a copper alloy, and the threaded hole as a blind hole, and it is apparent that this is not a limitation of the embodiments of the present application.

In this embodiment, the tool shank 10 is used to connect with a driving device and rotate under the driving of the driving device.

The tapping head 20 comprises a supporting rod 21 and tapping threads 22, the supporting rod 21 is arranged at one end, far away from the driving device, of the tool shank 10, the supporting rod 21 and the tool shank 10 share a central line 60, the tapping threads 22 are spirally arranged on the side wall of the supporting rod 21, and the tapping threads 22 are used for extruding internal threads 200 of the threaded holes when the tool shank 10 drives the supporting rod 21 to rotate along the first direction 40.

The cutting and shaping head 30 is disposed at one end of the support rod 21 away from the tool shank 10, and the cutting and shaping head 30 is concentric with the support rod 21 and the tool shank 10, wherein the cutting and shaping head 30 is used for cutting and shaping the internal thread 200 extruded by the tapping screw thread 22 when the tool shank 10 drives the support rod 21 to rotate along the second direction 50, and the second direction 50 is opposite to the first direction 40.

The process of the extrusion tap 100 of the present embodiment for machining the internal thread 200 of the threaded hole in the plastic material is approximately:

machining a pre-drilled hole (not shown) at a position where the threaded hole is required to be machined using a drill;

the driving device drives the extrusion tap 100 to rotate along the first direction 40 and stretches the tapping head 20 and the cutting shaping head 30 into the pre-drilled hole, and the tapping screw teeth 22 extrude the inner wall of the pre-drilled hole and match with the support rods 21 to extrude the internal threads 200 of the threaded hole;

the driving device drives the extrusion tap 100 to rotate in the second direction 50, and the tapping head 20 and the cutting and shaping head 30 cut and shape the crests 2101 of the crests 210 of the internal threads 200 during withdrawal from the threaded hole, thereby maintaining the heights of the crests 210 of the internal threads 200 consistent and reducing or eliminating the mouths 2102.

Referring to fig. 1 and 3, in the present embodiment, an end of the tool shank 10 away from the supporting rod 21 has a connecting portion 11, and the connecting portion 11 has a limiting surface 111. Specifically, the four limiting surfaces 111 are disposed on the side walls of the connecting portion 11 in the up, down, left and right directions, so that the connecting portion 11 is substantially square. Thus, through setting up connecting portion 11, be convenient for be connected with driving device, through setting up spacing face 111, can avoid handle of a knife 10 to produce slight rotation for driving device after being connected with driving device to be favorable to improving the machining precision of extrusion tap 100 to the internal thread 200 of screw hole.

In this embodiment, the tool shank 10 further includes a main body portion 12 and a transition portion 13, the transition portion 13 is connected with one end of the support rod 21 away from the cutting and shaping head 30, two ends of the main body portion 12 are respectively connected with the connecting portion 11 and the transition portion 13, the cross section of the main body portion 12 is larger than the cross section of the support rod 21, the transition portion 13 is approximately conical, and the cross section of the transition portion 13 gradually decreases from the cross section of the main body portion 12 to the cross section of the support rod 21 along a direction away from the main body portion 12. In this way, by providing the main body portion 12 and the transition portion 13, the structural strength of the extrusion tap 100 can be effectively improved.

Referring to fig. 1 and 3, in the present embodiment, the supporting rod 21 is provided with a plurality of lubrication grooves 213 disposed at intervals, the extending direction of the plurality of lubrication grooves 213 is the same as the extending direction of the supporting rod 21, and the plurality of lubrication grooves 213 divide the tapping screw 22 into a plurality of non-connected portions. The plurality of lubrication grooves 213 are used for injecting lubrication fluid when the tapping screw 22 extrudes the female screw 200 of the threaded hole, and for discharging chips formed by cutting and shaping the female screw 200 by the cutting and shaping head 30.

Specifically, when the tapping screw thread 22 extrudes the internal thread 200 of the threaded hole, a lubricating fluid needs to be injected into the pre-drilled hole to reduce the friction force between the tapping screw thread 22 and the inner wall of the pre-drilled hole, and the supporting rod 21 is provided with the lubricating groove 213, so that the lubricating fluid can conveniently flow between the tapping screw thread 22 and the inner wall of the pre-drilled hole through the lubricating groove 213, thereby being beneficial to improving the efficiency and quality of the tapping screw thread 22 extrusion threaded hole. In addition, when the cutting and shaping head 30 performs cutting and shaping on the internal thread 200, the lubrication groove 213 can also discharge chips formed by the cutting and shaping head 30 cutting the thread 210 of the internal thread 200, thereby avoiding the chips from accumulating and affecting the cutting and shaping effect of the cutting and shaping head 30 on the internal thread 200.

It should be noted that, the tapping head 20 of the present embodiment is to machine the internal thread 200 of the threaded hole by extrusion, and does not cut the inner wall of the pre-drilled hole, and belongs to chipless machining, so that a large-size drain groove is not required to be formed like a cutting tap, so that the core diameter (the diameter of the supporting rod 21) of the tapping head 20 is large, and further the structural strength of the tapping head 20 and the stability of the tapping head when machining the internal thread 200 of the threaded hole are improved. The cutting and shaping head 30 only generates a small amount of chips when cutting and shaping the internal thread 200, so that the chips can be smoothly discharged without increasing the size of the lubrication groove 213, thereby ensuring the structural strength of the tapping head 20 and the stability when machining the internal thread 200 of the threaded hole.

In this embodiment, the support bar 21 includes a drain section 211 and a tap bearing section 212. The tapping screw 22 is arranged on the tapping bearing section 212; both ends of the drain section 211 are respectively connected with the transition portion 13 of the tool shank 10 and the tapping load-bearing section 212, and a plurality of lubrication grooves 213 extend from the drain section 211 to the tapping load-bearing section 212. By providing the drain section 211, drain space can be reserved for the plurality of lubrication grooves 213, thereby facilitating the rapid draining of debris by the lubrication grooves 213.

In the present embodiment, the tapping screw 22 includes a tapping portion 221 and a guide portion 222. The guide part 222 is arranged at one end of the tapping bearing section 212 of the supporting rod 21, which is close to the cutting shaping head 30; the tapping portion 221 is disposed on the tapping load-bearing section 212 of the support rod 21 and on a side of the guide portion 222 facing away from the cutting and shaping head 30, the tapping portion 221 is connected end to end with the guide portion 222, the tapping portion 221 is used for extruding the internal thread 200 of the threaded hole, and the guide portion 222 is used for guiding the tapping portion 221 when the tapping portion 221 extrudes the internal thread 200 of the threaded hole.

In this embodiment, the guide 222 has a cross-section that gradually decreases in size in a direction away from the shank 10. In this way, by arranging the guide portion 222 to guide the tapping portion 221, when the tapping screw 22 extrudes the internal thread 200 of the threaded hole, the guide portion 222 contacts the inner wall of the pre-drilled hole and gradually guides the tapping portion 221 to extrude the inner wall of the pre-drilled hole, so that the situation that the tapping portion 221 is easy to deviate due to large size and is difficult to extrude the inner wall of the pre-drilled hole rapidly is avoided, and the quality and efficiency of processing the internal thread 200 of the threaded hole are improved.

Referring to fig. 1, 2 and 4, in the present embodiment, the cutting and shaping head 30 includes a supporting portion 31, a first cutting edge portion 32 and a second cutting edge portion 33. The supporting part 31 is arranged at one end of the tapping bearing section 212 of the supporting rod 21, which is away from the knife handle 10; the first cutting edge portion 32 and the second cutting edge portion 33 are symmetrically provided to the supporting portion 31, and the first cutting edge portion 32 and the second cutting edge portion 33 are used for cutting and shaping the internal thread 200. Wherein, the supporting portion 31 is in a block shape, the first cutting edge portion 32 and the second cutting edge portion 33 are symmetrically disposed on a side wall of one end of the supporting portion 31 away from the supporting rod 21, and the cutting edge 321 is disposed at one end of the first cutting edge portion 32 and the second cutting edge portion 33 away from each other, and the cutting edge 321 is used for cutting and shaping the internal thread 200.

When the cutting and shaping head 30 is rotated in the second direction 50 by the support bar 21, the first cutting edge portion 32 and the second cutting edge portion 33 sequentially cut the crests 2101 of the crests 210 of the internal threads 200, thereby maintaining the height of the crests 210 of the internal threads 200 uniform and reducing or eliminating the crests 2102. In this way, by providing the first cutting edge portion 32 and the second cutting edge portion 33 on the support portion 31, the structure is simple and it is advantageous to improve the accuracy of cutting and shaping the internal thread 200 of the screw hole.

In this embodiment, the supporting portion 31 is provided with a first temporary storage groove 311 and a second temporary storage groove 312, the first temporary storage groove 311 and the second temporary storage groove 312 are symmetrically arranged, the first temporary storage groove 311 is located on one side of the first cutting edge portion 32, the second temporary storage groove 312 is located on one side of the second cutting edge portion 33, the first temporary storage groove 311 and the second temporary storage groove 312 are respectively communicated with the adjacent lubrication groove 213, and the first temporary storage groove 311 and the second temporary storage groove 312 are respectively used for temporarily storing chips formed by cutting and shaping the internal threads 200 of the threaded holes by the first cutting edge portion 32 and the second cutting edge portion 33, so that the chips are prevented from accumulating and are convenient to discharge from the lubrication groove 213.

In the present embodiment, the first cutting edge portion 32 and the second cutting edge portion 33 are each provided obliquely to the supporting portion 31, and the angle of inclination of the first cutting edge portion 32 and the second cutting edge portion 33 is the same as the angle of inclination of the tapping thread 22. In this way, the cutting edges 321 of the first and second cutting edge portions 32 and 33 can continuously cut and shape the internal thread 200 in the extending direction of the thread ridge 210 of the internal thread 200, thereby contributing to improvement in the accuracy and efficiency of cutting and shaping the internal thread 200 of the threaded hole.

Referring to fig. 1, 3 and 4, in the present embodiment, the diameter of the cutting and shaping head 30 is larger than the diameter of the support rod 21 and smaller than the diameter of the tapping screw 22. Specifically, the diameter of the cutting and shaping head 30 is the distance between the ends of the first and second cutting edge portions 32, 33 that are remote from each other. As shown in fig. 3, the tapping screw 22 has a diameter D ₁ The diameter of the support rod 21 is D ₂ The cutting and shaping head 30 has a diameter D ₃ ，D ₁ >D ₃ >D ₂ . When the tapping screw 22 and the support rod 21 are matched with the internal thread 200 of the extrusion-molded threaded hole, the maximum height of the tooth crest 210 of the internal thread 200 is D ₁ And D ₂ When the first cutting edge portion 32 and the second cutting edge portion 33 cut and shape the thread 210 of the internal thread 200, D ₁ And D ₃ Half the difference is the height of the thread 210 of the shaped internal thread 200, and D ₃ I.e., the inner diameter of the internal thread 200 of the threaded bore. Thus, by reasonably setting the diameter of the cutting and shaping head 30, the cutting and shaping head can be internally provided withThe height of the thread 210 of the thread 200 and the inner diameter of the internal thread 200 are precisely controlled, so that the processing precision of the internal thread 200 of the threaded hole is improved, the design period of the extrusion tap 100 is reduced, and the material waste caused by the fact that the traditional extrusion tap relies on experience to carry out structural design is avoided.

In this embodiment, the difference between the diameter of the cutting and shaping head 30 and the diameter of the supporting rod 21 may be in the range of 0.02mm to 0.06mm, specifically may be 0.04mm, that is, the maximum cutting height of the first cutting edge portion 32 and the second cutting edge portion 33 on the tooth ridge 210 of the internal thread 200 is 0.02mm, so that the cutting torque force required by the first cutting edge portion 32 and the second cutting edge portion 33 is small, which is beneficial to improving the service life of the cutting edge 321 while ensuring the cutting and shaping effect of the cutting and shaping head 30 on the internal thread 200.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a comparison of the cutting and shaping head 30 before and after cutting and shaping the thread ridge 210 of the internal thread 200 according to an embodiment of the present application, and by reasonably setting the diameter of the cutting and shaping head 30, the height of the thread ridge 210 of the internal thread 200 can be precisely controlled and the thread mouth 2102 can be reduced or eliminated.

To sum up, the extrusion tap 100 according to the embodiment of the application includes the supporting rod 21 and the tapping screw 22 by setting the tapping head 20, when the tool shank 10 drives the supporting rod 21 to rotate along the first direction 40, the tapping screw 22 can extrude the internal thread 200 of the threaded hole, and since the tapping head 20 extrudes the internal thread 200 of the threaded hole by using the plastic deformation principle of the plastic material, the crystalline phase fiber of the plastic material is not damaged, thereby being beneficial to improving the tooth surface hardening degree and the cutting strength of the internal thread 200. By arranging the cutting and shaping head 30 to cut and shape the internal thread 200 when the tool shank 10 drives the supporting rod 21 to rotate along the second direction 50, the height of the tooth hills 210 of the internal thread 200 can be kept consistent, and the tooth mouths 2102 are reduced or eliminated, so that the sizes of the internal thread and the tooth mouths are effectively controlled, and the machining precision of the internal thread is improved.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. An extrusion tap, comprising:

a knife handle;

the tapping head comprises a supporting rod and tapping threads, the supporting rod is arranged at one end of the tool handle, the tapping threads are arranged on the supporting rod, and the tapping threads are used for extruding internal threads of threaded holes when the tool handle drives the supporting rod to rotate along a first direction;

the cutting shaping head is arranged at one end of the supporting rod, which is away from the tool handle, and is used for cutting and shaping the internal threads formed by extrusion of the tapping screw teeth when the tool handle drives the supporting rod to rotate along a second direction, wherein the second direction is opposite to the first direction.

2. The extrusion tap of claim 1, wherein the cutting and shaping head comprises:

the support part is arranged at one end of the support rod, which is away from the knife handle;

the first cutting edge part and the second cutting edge part are symmetrically arranged on the supporting part, and the first cutting edge part and the second cutting edge part are used for cutting and shaping the internal thread.

3. The extrusion tap according to claim 2, wherein the support portion is provided with a first temporary storage groove and a second temporary storage groove which are symmetrically arranged, the first temporary storage groove is located at one side of the first cutting edge portion, the second temporary storage groove is located at one side of the second cutting edge portion, and the first temporary storage groove and the second temporary storage groove are respectively used for temporarily storing chips formed by cutting and shaping the internal thread by the first cutting edge portion and the second cutting edge portion.

4. The extrusion tap of claim 2, wherein the first cutting edge portion and the second cutting edge portion are each disposed obliquely to the support portion, and the first cutting edge portion and the second cutting edge portion are each disposed at the same angle as the tapping screw.

5. The extrusion tap of claim 1, wherein the cutting and shaping head has a diameter greater than the diameter of the support rod and less than the diameter of the tapping thread.

6. The extrusion tap according to claim 1, wherein the support bar is provided with a plurality of lubrication grooves arranged at intervals, the plurality of lubrication grooves extend in the same direction as the support bar, the plurality of lubrication grooves divide the tapping screw into a plurality of mutually unconnected portions, the plurality of lubrication grooves are used for injecting lubrication liquid when the tapping screw is extrusion-formed into the internal thread, and for discharging chips formed by cutting and shaping the internal thread by the cutting and shaping head.

7. The extrusion tap of claim 6, wherein the support bar comprises:

the tapping bearing section is provided with tapping threads;

and the drainage section is used for reserving drainage spaces for the lubrication grooves.

8. The extrusion tap of claim 1, wherein the tapping thread comprises:

the guide part is arranged at one end of the supporting rod, which is close to the cutting shaping head;

the tapping part is arranged on the supporting rod and is positioned on one side, away from the cutting shaping head, of the guiding part, the tapping part is used for extrusion molding of the internal thread, and the guiding part is used for guiding the tapping part.

9. The extrusion tap of claim 8, wherein the cross-section of the guide portion tapers in size in a direction away from the shank.

10. The extrusion tap of claim 1, wherein an end of the shank remote from the support bar has a connecting portion, the connecting portion having a stop surface.