Extrusion screw tap

Abstract

The utility model provides an extrusion screw tap, which relates to the technical field of screw taps, and comprises a screw tap body and a tap tooth part, the tap tooth part comprises a plurality of extrusion blades, a plurality of ridges and ridges are arranged on the extrusion blades, a height difference exists between the ridges and the ridges, and the ridges and the ridges are alternately arranged in the radial direction and the axial direction. Through the arrangement of the ridges and the ridges and the valleys, the contact area between the screw tap and a workpiece is reduced, then the friction force is reduced, the problems that the screw tap is abraded too fast and the tapping smoothness is poor are solved, cooling oil enters the screw tap more easily, the cooling and lubricating performance is improved, in addition, the staggered arrangement mode is adopted, the ridges adopt the tooth skipping mode, and the service life of the screw tap is prolonged. In the extrusion process, the mode that one tooth is contacted and skipped and then one tooth is contacted is adopted for extrusion, so that the contact surface can be reduced, the total extrusion edge number of the screw tap can be increased, but the actual stress is smaller than that of a traditional screw tap, and great help is provided for improving the performance.

Description

Technical Field

[0001] The utility model relates to the technical field of taps, in particular to an extrusion tap. Background Art

[0002] An extrusion tap is a tap that uses the principle of metal plastic deformation to process internal threads. It has the advantage of good processing performance and is widely used in the field of internal thread processing.

[0003] During the tapping process, the extrusion tap and the workpiece are in close contact, which can easily lead to a large contact area between the two, resulting in a large friction range between the two, which in turn can easily cause the extrusion tap to wear too quickly, reducing the service life of the extrusion tap. At the same time, it can also easily lead to the deterioration of the cooling and lubrication performance of the extrusion tap, causing waste chips to stick to the extrusion tap, reducing the smoothness of tapping. In response to the above-mentioned defects, the present application is proposed. Utility Model Content

[0004] The utility model aims to provide an extrusion tap, which solves the problems of rapid wear of the extrusion tap and poor tapping smoothness by reducing the friction range, and improves the cooling and lubricating performance.

[0005] To solve the above problems, the utility model provides an extrusion tap, comprising a tap body and a tapered tooth portion, the tapered tooth portion comprising a plurality of extrusion blades, the extrusion blades being provided with a plurality of ridges and valleys, the ridges and valleys having a height difference between the ridges and valleys, and the ridges and valleys being alternately arranged in the radial and axial directions.

[0006] According to an embodiment of the present invention, the height difference between the ridges and the valleys is 0.01-0.5 mm.

[0007] According to an embodiment of the present invention, the number of the ridges is set to be odd, and symmetry can still be formed after alternating distribution. Due to the spiral relationship, radial alternation and axial alternation can be achieved.

[0008] Optionally, the ridges and valleys are provided on all or part of the extrusion edges.

[0009] According to an embodiment of the present invention, the projection of the ridge on the adjacent valley in the axial direction is located in the middle of the valley.

[0010] According to an embodiment of the present invention, an oil groove is provided on the tap body, or an oil groove may not be provided.

[0011] According to an embodiment of the present invention, the size of the extrusion edge of the tapered portion gradually increases from the cutting end to the other end.

[0012] According to an embodiment of the present invention, the extruding tap further includes a handle, and the handle is connected to the tap body.

[0013] According to an embodiment of the present invention, a coating is provided on the tapered portion to improve wear resistance.

[0014] The beneficial effect of the present invention is that, by setting the ridges and valleys, the contact area between the tap and the workpiece is reduced, thereby reducing friction, avoiding the problems of excessive wear of the tap and poor tapping smoothness, making it easier for cooling oil to enter, and improving the cooling and lubrication performance. In addition, the staggered setting method is adopted, so that the ridges adopt a skipping tooth method, and the extrusion process adopts a contact-one-tooth-skip-one-tooth-and-then-contact-one-tooth method of extrusion, which can reduce the contact area. In this way, the overall number of extrusion ridges of the tap can be increased, but the actual force it is subjected to is less than that of a traditional tap, which is of great help in improving performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 Schematic diagram of the overall structure of the extrusion tap;

[0017] Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle;

[0018] Figure 3 for Figure 1 Schematic diagram of the structure at B in the middle;

[0019] Figure 4 It is a three-dimensional diagram of the extrusion tap;

[0020] Figure 5 This is an enlarged schematic diagram of the tapered tooth part. DETAILED DESCRIPTION

[0021] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0022] Example 1:

[0023] A screw tap, such as Figure 1 , including a tap body 1, a shank 2 and a taper 3.

[0024] like Figure 1The conical tooth portion 3 includes a plurality of extrusion blades 35. A coating is provided on the conical tooth portion 3 to improve the wear resistance. The left end of the conical tooth portion 3 is a cutting section, and the right end is a calibration section. A plurality of ridges 32 and valleys 33 are provided on the extrusion blade 35. The ridges 32 and valleys 33 are distributed in a spiral as a whole. There is a height difference K between the ridges 32 and valleys 33, as shown in FIG. Figure 2 The height difference K between the ridges 32 and the valleys 33 is in the range of 0.01 to 0.5 mm, and the ridges 32 and the valleys 33 are alternately arranged in the radial and axial directions, such as Figure 3 The projection of the ridge 32 on the adjacent valley 33 in the axial direction is located in the middle of the valley 33.

[0025] In this embodiment, the ridges 32 and the valleys 33 are provided on part of the extrusion edge 35 , preferably not on the cutting section but on the calibration section.

[0026] Preferably, the number of ridges 32 is set to be odd, and symmetry can still be formed after alternating distribution. Due to the relationship of the spiral, radial alternation and axial alternation can be achieved.

[0027] By configuring the ridges and valleys, a skipping tooth pattern is employed at the ridges. During the extrusion process, the tap contacts one tooth, then skips over it, and then contacts the next tooth. This reduces the contact surface and decouples the force points between the tap and the workpiece from the number of extrusion ridges. For example, an 8-ridge extrusion tap actually only has four force points per pitch. This increases the number of extrusion ridges, while reducing the actual force applied to the tap compared to traditional taps, significantly improving performance. Furthermore, during the extrusion process, the force points are evenly distributed around the hole wall, making them smaller than those of conventional extrusion taps. This reduces friction while also improving processing stability and precision.

[0028] Example 2:

[0029] On the basis of Example 1, the extrusion edge of the tapered tooth portion 3 is formed by the cutting end ( Figure 1 The size gradually increases from the center left end to the other end, which is the calibration end.

[0030] Example 3:

[0031] On the basis of embodiment 1 or 2, an oil groove is provided on the tap body 1. The structure of the oil groove can refer to the oil groove structure setting in the company's prior patent CN202311076155.9 A kind of extrusion tap.

[0032] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. An extrusion tap, characterized in that: The tap comprises a tap body (1) and a tapered tooth portion (3), wherein the tapered tooth portion (3) comprises a plurality of extrusion blades (35), and the extrusion blades (35) are provided with a plurality of ridges (32) and ridge valleys (33), wherein a height difference exists between the ridges (32) and the ridge valleys (33), and the ridges (32) and the ridge valleys (33) are alternately arranged in the radial direction and the axial direction.

2. The extrusion tap according to claim 1, characterized in that: The height difference between the ridge (32) and the valley (33) is 0.01-0.5 mm.

3. The extrusion tap according to claim 1, characterized in that: The number of the ridges (32) is set to be odd.

4. The extrusion tap according to any one of claims 1 to 3, characterized in that: The ridges (32) and valleys (33) are provided on all the extrusion blades (35).

5. The extrusion tap according to any one of claims 1 to 3, characterized in that: The ridges (32) and valleys (33) are provided on a portion of the extrusion edge (35).

6. The extrusion tap according to claim 1, characterized in that: The projection of the ridge (32) onto the adjacent valley (33) in the axial direction is located in the middle of the valley (33).

7. The extrusion tap according to claim 1, characterized in that: An oil groove is provided on the tap body (1).

8. The extrusion tap according to claim 1, characterized in that: The size of the extrusion edge (35) of the tapered portion (3) gradually increases from the cutting end to the other end.

9. The extrusion tap according to claim 1, characterized in that: The extrusion tap further comprises a shank (2), wherein the shank (2) is connected to the tap body (1).

10. The extrusion tap according to claim 1, characterized in that: A coating is provided on the tapered tooth portion (3).

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