Hard alloy extrusion tap with cutting edge

Abstract

The utility model relates to a cutting edge hard alloy extrusion tap which is composed of a tap handle part, tap guide teeth and extrusion taper teeth, a front tool face and a rear tool face are arranged on the front end face of the tap taper teeth, a cutting edge formed between the front tool face and the rear tool face is the cutting edge, and the front angle and the rear angle of the cutting edge are both 2-4 degrees. The utility model solves the problem that aluminum scraps are left at the bottom of a blind hole of a threaded bottom hole due to drilling, so that the aluminum scraps are clamped when the screw tap extrudes and processes to the bottom, meanwhile, the service life of the extrusion screw tap is prolonged, and the extrusion screw tap can be widely used.

Description

Technical Field

[0001] The utility model relates to the technical field of internal thread forming tools, in particular to a hard alloy extrusion tap with a cutting edge. Background Art

[0002] At present, the end face of the extrusion tap tool used in traditional extrusion thread processing is a plane. The bottom hole is drilled before processing the extrusion thread. During drilling, aluminum chips are likely to remain or splash into the bottom hole. When the extrusion tap is tapped, the aluminum chips remaining in the bottom hole will be pressed tightly to the bottom of the thread. Even an air gun cannot completely blow out the aluminum chips, resulting in unqualified quality of the product screw hole thread. Moreover, such extrusion tap tools are often squeezed by external forces of residual aluminum chips, and are easily damaged, resulting in a short lifespan, which greatly increases the processing cost. Summary of the invention

[0003] The utility model aims to provide a cutting-edge cemented carbide extrusion tap, which comprises a tap shank, a tap guide tooth and a taper tooth. A rake face and a flank face are arranged on the front end face of the taper tooth. The cutting edge formed between the rake face and the flank face is a cutting edge, and the front angle and the back angle of the cutting edge are both 2° to 4°.

[0004] The utility model is further improved in that the cone cutting edge has two working conditions: external cooling and central water outlet internal cooling.

[0005] A further improvement of the utility model is that a plurality of oil grooves and a plurality of cutting edges are evenly distributed on the front end of the cone.

[0006] Compared with the prior art, the utility model has the following advantages:

[0007] The utility model solves the problem of aluminum chips being stuck and squeezed at the bottom of the threaded blind hole, while increasing the service life of the extrusion tap and can be widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Figure 2 It is a side view of the utility model;

[0010] Figure 3 This is an enlarged view of the front end of the cone;

[0011] Numbers in the figure: 1. Tap shank; 2. Tap guide teeth; 3. Extrusion taper teeth; 4. Cutting edge; 5. Rake face; 6. Back face; 7. Process hole; 8. Oil groove. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. The elements and features described in one embodiment of the utility model can be combined with the elements and features shown in one or more other embodiments. It should be noted that for the purpose of clarity, the description omits the representation and description of components and processes that are not related to the utility model and are known to ordinary technicians in this field. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without creative work are within the scope of protection of the utility model.

[0013] like Figures 1 to 3 As shown, a cutting-edge cemented carbide extrusion tap is composed of a tap shank 1, a tap guide tooth 2 and an extrusion cone tooth 3. A rake face 5 and a flank face 6 are provided on the front end face of the cone. The cutting edge formed between the rake face 5 and the flank face 6 is a cutting edge 4. The rake angle and the flank angle of the cutting edge 4 are both 2° to 4°, that is, the rake angle of the cutting edge 4 is the angle between the cutting edge and the rake face 5, and the flank angle of the cutting edge 4 is the angle between the cutting edge and the flank face 6. A plurality of oil grooves 8 are evenly distributed at the front end of the cone. The tap with a cutting edge at the front end of the cone can cut the aluminum chips remaining in the hole together when tapping, and can be taken away together when flushing with cutting fluid or the aluminum chips can be easily blown clean with an air gun later.

[0014] A process hole 7 is provided in the center of the cone, which can be extended to become an inner cooling hole, and become two styles of inner cooling and outer cooling. It can be applied to machine tools with or without inner cooling at the same time. It can not only cut the residual aluminum chips into fine pieces and flush them away, but also prolong the life of the tap.

[0015] After the M6 ​​bottom hole is processed by the utility model, aluminum chips are stuffed into the hole by the pre-drilling, and then the tap with a cutting edge at the front end is used for tapping. After tapping, check that there is no aluminum chips left in the hole. The utility model solves the problem of aluminum chips stuck at the bottom of the thread, and at the same time increases the service life of the extrusion tap by at least 10% to 20%. The utility model can be applied to new energy aluminum alloy box products, and can also be widely used in integrated structural products.

[0016] Finally, it should be noted that: although the utility model and its advantages have been described in detail above, it should be understood that various changes, substitutions and transformations can be made without exceeding the spirit and scope of the utility model defined by the attached claims. Moreover, the scope of the utility model is not limited to the specific embodiments of the processes, devices, means, methods and steps described in the specification. It will be easily understood by those of ordinary skill in the art from the disclosure of the utility model that according to the utility model, existing and future processes, devices, means, methods or steps that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the corresponding embodiments described herein can be used. Therefore, the attached claims are intended to include such processes, devices, means, methods or steps within their scope.

Claims

1. A cutting edge cemented carbide extrusion tap, comprising a tap shank (1), a tap guide tooth (2) and a tap tooth (3), characterized in that: A rake face (5) and a flank face (6) are provided on the front end surface of the conical tooth portion, and a cutting edge formed between the rake face (5) and the flank face (6) is a cutting edge (4), and the rake angle and flank angle of the cutting edge (4) are both 2° to 4°.

2. A cemented carbide extrusion tap with a cutting edge according to claim 1, characterized in that: A process hole (7) is arranged at the center of the cone body of the cutting edge cemented carbide extrusion tap, and the extrusion taps of the inner cooling type and the extrusion taps of the outer cooling type are applicable.

3. A cemented carbide extrusion tap with a cutting edge according to claim 1, characterized in that: A plurality of oil grooves (8) are evenly distributed on the front end of the cone body of the cutting edge cemented carbide extrusion tap.

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