Extrusion tap for preventing tooth collapse

Abstract

The utility model relates to tap technical field, a kind of extrusion tap of preventing tooth collapse, including the handle part and cutting portion being connected, the cutting portion includes cutting edge and correction blade being sequentially arranged along the direction of cutting portion direction to handle part, the cutting portion outer wall is provided with several oil guide grooves along length direction, the head of the cutting edge is provided with tool entry opening, the terminal end of the tool entry opening is not provided with the oil guide groove. The utility model structure design is ingenious, and the tool entry opening fracture of extrusion tap can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to an extrusion tap designed to prevent tooth breakage. Background Technology

[0002] A forming tap is a threading tool that uses the principle of metal plastic deformation to machine internal threads. When using a forming tap, it is necessary to use coolant flowing through the oil guide groove to ensure the protection of the tap and the machining accuracy.

[0003] Please refer to Figure 1 Traditional forming taps have oil guide grooves evenly distributed along the entire circumference of the cutting section. The head of the forming tap is equipped with an inlet to generate stronger cutting force at the beginning of internal thread forming. Because the oil guide grooves are evenly distributed along the entire circumference of the cutting section, there are also oil guide grooves at the inlet. Since the oil guide grooves extend from the head of the forming tap to the shank, the presence of the oil guide grooves causes the cutting face at the inlet to break. This discontinuous cutting face is very prone to breakage when machining internal threads, causing production problems and increasing production costs.

[0004] In view of this, the applicant has developed a utility model of an extrusion tap with an ingenious structural design that can effectively prevent chipping of the cutting edge. Utility Model Content

[0005] The purpose of this invention is to provide an anti-breakage extrusion tap to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An anti-breakage extrusion tap includes a shank and a cutting section connected together. The cutting section includes a cutting edge and a straightening edge arranged sequentially along the direction from the cutting section to the shank. The outer wall of the cutting section has a plurality of oil guide grooves along its length. The head of the cutting edge is provided with an inlet, and the end of the inlet is not provided with the oil guide grooves.

[0008] As a further improvement, the head of the cutting edge is a feed section, which includes a feed inlet and a feed cutting tooth arranged circumferentially.

[0009] As a further improvement, the feed inlet is a feed surface with gradually increasing width in the circumferential direction, and the radius of the feed surface from the center of the cutting end face gradually increases until it is equal to the outer diameter of the cutting edge.

[0010] As a further improvement, the end of the feed inlet is located at the connection between the feed inlet and the feed cutting tooth.

[0011] As a further improvement, the cutting part does not have the oil guide groove in the length direction of the area where the feed surface is located, but the cutting part has a plurality of oil guide grooves uniformly arranged along the circumference in the length direction of other areas.

[0012] As a further improvement, the number of oil guide grooves is five.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This type of anti-breakage extrusion tap has an oil guide groove at the inlet of the cutting section, which is combined with several oil guide grooves at other positions of the cutting section. On the one hand, it can not only form a complete inlet, avoiding the breakage of discontinuous inlets during rotary cutting, thus avoiding production problems and wasted costs; on the other hand, its oil guide grooves can also ensure the flow of coolant, ensuring the use of the whole extrusion tap.

[0015] 2. The end of the feed port of the anti-breakage extrusion tap is located at the connection between the feed port and the feed cutting tooth. This connection is the connection point from the guide to the cutting of the extrusion tap, and it is also the point where the cutting force changes the most. Therefore, eliminating the oil guide groove at this point can most effectively avoid the problem of feed port breakage and effectively ensure the stability and continuity of the overall cutting force. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a traditional forming tap;

[0017] Figure 2 This is a schematic diagram of the structure of an anti-breakage extrusion tap according to the present invention;

[0018] Figure 3 yes Figure 2 Enlarged schematic diagram of the structure at the infeed point.

[0019] In the picture:

[0020] 10. Cutting section; 11. Cutting edge; 111. Feed section; 1111. Feed port; 1112. Feed cutting tooth; 12. Correcting edge; 20. Shank; 30. Oil guide groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0025] Please refer to Figure 2 and Figure 3 ,in Figure 2 The left side is a view along the length of the extrusion tap to more clearly show the layout of the guide grooves. An anti-breakage extrusion tap includes a shank 20 and a cutting section 10 connected together. The cutting section 10 includes a cutting edge 11 and a straightening edge 12 arranged sequentially along the direction from the cutting section 10 to the shank 20. The outer wall of the cutting section 10 has a plurality of oil guide grooves 30 along its length. The head of the cutting edge 11 is provided with an inlet 1111, and the end of the inlet 1111 is not provided with the oil guide grooves 30.

[0026] The cutting section 10 does not have an oil guide groove 30 at the inlet 1111. Combined with the several oil guide grooves 30 set at other positions of the cutting section 10, on the one hand, it can form a complete inlet 1111, avoiding the breakage of discontinuous inlets 1111 during rotary cutting, thereby avoiding production problems and wasted costs; on the other hand, its oil guide grooves 30 can also ensure the flow of coolant, ensuring the use of the overall extrusion tap.

[0027] Furthermore, the head of the cutting edge 11 is a feed section 111, which includes a feed inlet 1111 and a feed cutting tooth 1112 arranged circumferentially. The feed inlet 1111 is used to guide the rotation angle during the extrusion tap cutting so as to gradually transition to the height of the feed cutting tooth 1112, avoiding the problem of tool breakage that is easily caused by cutting directly with the feed cutting tooth 1112. The feed cutting tooth 1112 is used to open the hole for the internal thread to be machined during the initial extrusion.

[0028] Furthermore, the feed inlet 1111 has a gradually increasing width in the circumferential direction, and the radius of the feed inlet from the center of the end face of the cutting part 10 gradually increases until it is equal to the outer diameter of the cutting edge 11. The gradually increasing width of the feed inlet effectively increases the depth of cut, gradually increasing the cutting amount initially, while the gradually increasing radius allows for a gradual transition to the height of the feed cutting tooth 1112. The combination of these two aspects makes the structure of the feed inlet more reasonable.

[0029] Please refer to Figure 2 and Figure 3 The end of the feed inlet 1111 is located at the connection between the feed inlet 1111 and the feed cutting tooth 1112. This connection point is the point where the extrusion tap connects from the guide to the cutting, and it is also the point where the cutting force changes the most. Therefore, eliminating the oil guide groove 30 at this point can most effectively avoid the problem of the feed inlet 1111 breaking, and effectively ensure the stability and continuity of the overall cutting force.

[0030] Furthermore, the cutting part 10 does not have the oil guide groove 30 in the length direction of the area where the feed surface is located, but the cutting part 10 has a plurality of oil guide grooves 30 evenly arranged circumferentially in the length direction of other areas. The structure of not having oil guide grooves 30 in this length direction ensures the stability of the stress on this part and prevents it from breaking during cutting. At the same time, the even arrangement of oil guide grooves 30 in other parts can also effectively achieve uniform cooling.

[0031] Furthermore, the number of oil guide grooves 30 is five, and the entire extrusion tap is equivalent to a five-sided, five-groove design, which can ensure the flow and cooling effect of coolant, while also avoiding the risk of breakage at the inlet 1111.

[0032] The diameter of each cutting edge 11 increases sequentially along the direction from the cutting part 10 to the shank 20 until it is the same as the diameter of the correcting edge 12. During the cutting process, the cutting edge 11 of the cutting part 10 is used to drill holes, and then the correcting edge 12 is used to cut the subsequent holes to the same radius to realize the tapping process.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A tap for preventing tooth chipping, characterized in that: It includes a shank (20) and a cutting part (10) connected to each other. The cutting part (10) includes a cutting edge (11) and a straightening edge (12) arranged sequentially along the direction from the cutting part (10) to the shank (20). The outer wall of the cutting part (10) is provided with a plurality of oil guide grooves (30) along the length direction. The head of the cutting edge (11) is provided with an inlet (1111), and the end of the inlet (1111) is not provided with the oil guide grooves (30).

2. The anti-breakage extrusion tap according to claim 1, characterized in that: The head of the cutting edge (11) is an infeed portion (111), which includes an infeed port (1111) and an infeed cutting tooth (1112) arranged along the circumference.

3. The anti-breakage extrusion tap according to claim 2, characterized in that: The feed inlet (1111) is a feed surface with gradually increasing width in the circumferential direction. The radius of the feed surface from the center of the end face of the cutting part (10) gradually increases until it is equal to the outer diameter of the cutting edge (11).

4. The anti-breakage extrusion tap according to claim 2, characterized in that: The end of the feed inlet (1111) is located at the connection between the feed inlet (1111) and the feed cutting tooth (1112).

5. The anti-breakage extrusion tap according to claim 3, characterized in that: The cutting part (10) does not have the oil guide groove (30) in the length direction of the area where the feed surface is located, but the cutting part (10) has a plurality of oil guide grooves (30) uniformly arranged along the circumference in the length direction of other areas.

6. The anti-breakage extrusion tap according to claim 5, characterized in that: The number of oil guide grooves (30) is five.

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