Multi-layer step head drilling composite screw tap

Abstract

The utility model relates to the field of screw taps, in particular to a multilayer step head drilling composite screw tap which comprises a handle portion and a working portion. The working part is provided with a spiral cutting groove and a drill bit, and a screw tap structure is arranged in the middle of the spiral cutting groove; a stepped cutting groove is formed in the rear tool face of the drill bit, the stepped cutting groove is of a spiral structure, the stepped cutting groove and the spiral cutting groove are the same in direction, and the outer side of a stepped part of the stepped cutting groove inclines towards one side of the handle part. The screw tap structure has the advantages that the screw tap structure is arranged in the middle of the spiral cutting groove, meanwhile, the step cutting groove is formed in the position of the drill bit, the cutting speed is increased, meanwhile, thread machining is directly carried out during punching, normal work and chip removal of the drill bit are not affected, and the working efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of taps, in particular to a multi-layer step head drilling composite tap. Background Art

[0002] In the processing of threaded holes, a drill is usually used to drill the bottom hole first to achieve positioning and pre-processing functions, and then a tap is used for tapping. In other words, the processing of threaded holes requires the use of two tools. On the one hand, the replacement of tools wastes time and reduces work efficiency. On the other hand, repeated positioning is required, which reduces accuracy.

[0003] Chinese patents with publication numbers CN2855605Y, CN107971533A, and CN201632690U all disclose a multi-layer step-head drilling composite tap to solve the above problems;

[0004] However, the tap structures in the above patents are all located behind the drill bit structure, resulting in poor chip removal effect; and the drill bit structure is an ordinary twist drill, which has a slow cutting speed and is easy to wear, thereby reducing work efficiency. Utility Model Content

[0005] In order to overcome the above-mentioned shortcomings, the utility model provides a technical solution that can solve the above-mentioned problems.

[0006] A multi-layer step head drilling composite tap, comprising a shank and a working part;

[0007] The working part is provided with a spiral groove and a drill bit, and the middle part of the spiral groove is provided with a tap structure;

[0008] A stepped groove is arranged on the rear cutting surface of the drill bit. The stepped groove has a spiral structure. The direction of the stepped groove is the same as that of the spiral groove. The outer side of the stepped portion of the stepped groove is inclined toward one side of the shank.

[0009] As a further solution of the utility model: a cutting edge is arranged at the front end of the drill bit.

[0010] As a further solution of the utility model, the area of ​​the step groove cutting portion decreases step by step toward the shank side.

[0011] As a further solution of the utility model: the tap structure is arranged on the cutting portion of the spiral groove.

[0012] Compared with the prior art, the beneficial effect of the utility model is: by setting the tap structure in the middle of the spiral cutting groove and providing a stepped cutting groove at the drill bit, not only the cutting speed is improved, but also the thread processing is directly performed when drilling, which does not affect the normal operation and chip removal of the drill bit, and effectively improves the work efficiency.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a structural diagram of a drill bit.

[0017] As shown in the figure: 1. Shank; 2. Working part; 3. Spiral grooving; 4. Drill bit; 5. Tap structure; 6. Step grooving; 7. Cutting edge. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1-2 , a multi-layer step head drilling composite tap, comprising a shank 1 and a working part 2;

[0023] The working part 2 is provided with a spiral groove 3 and a drill bit 4, and a tap structure 5 is provided in the middle of the spiral groove 3;

[0024] A stepped groove 6 is arranged on the rear cutting edge of the drill bit 4 . The stepped groove 6 is in a spiral structure. The stepped groove 6 has the same direction as the spiral groove 3 . The outer side of the stepped portion of the stepped groove 6 is inclined toward the shank 1 .

[0025] When the drill bit 4 is drilling, the step groove 6 on the drill bit 4 can help the drill bit 4 reduce its own wear. After the drill bit 4 enters the metal block, since the step groove 6 has an overall spiral structure, only a very small force is needed to help the drill bit 4 cut inward; and the outer side of the step portion of the step groove 6 is inclined toward the side of the shank 1, which can reduce the wear on the step groove 6 and ensure the cutting speed and efficiency of the drill bit 4.

[0026] As a further solution of the utility model: a cutting edge 7 is provided at the front end of the drill bit 4 .

[0027] This makes it easier for the drill bit 4 to cut into the interior of the metal block.

[0028] As a further solution of the utility model, the area of ​​the cutting portion of the step groove 6 decreases step by step toward the shank 1 side.

[0029] During cutting, the greater the pressure at the end closest to the drill bit 4, the smaller the resistance generated by cutting. Therefore, it is necessary to cut as much distance as possible to reduce the pressure on the subsequent step groove 6, thereby improving the cutting speed and efficiency.

[0030] As a further solution of the utility model: the tap structure 5 is arranged on the cutting part of the spiral groove 3 .

[0031] It can not affect the chip removal of the spiral groove 3, and effectively perform thread processing on the hole at the same time.

[0032] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "including a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-layer step head drilling composite tap, characterized in that: It includes a handle and a working part; The working part is provided with a spiral groove and a drill bit, and the middle part of the spiral groove is provided with a tap structure; A stepped groove is arranged on the rear cutting surface of the drill bit. The stepped groove has a spiral structure. The direction of the stepped groove is the same as that of the spiral groove. The outer side of the stepped portion of the stepped groove is inclined toward one side of the shank.

2. The multi-layer step head drilling composite tap according to claim 1, characterized in that: The front end of the drill bit is provided with a cutting edge.

3. The multi-layer step head drilling composite tap according to claim 1, characterized in that: The area of ​​the step groove cutting part decreases gradually toward the shank side.

4. The multi-layer step head drilling composite tap according to claim 1, characterized in that: The tap structure is arranged on the cutting portion of the spiral groove.

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