A thread processing method for a tapping tap and a tapping tap

Abstract

The present application provides a tapping tap thread processing method and a tapping tap, comprising: selecting a tapping tap of corresponding specifications; measuring the angle α formed by the cutting edge relative to the horizontal plane, and determining whether the angle α meets a first preset condition; in response to the angle α meeting the first preset condition, measuring the angle β formed by the calibration blade relative to the horizontal plane, and determining whether the angle β meets a preset second preset condition; in response to the angle β meeting the second preset condition, measuring the angle γ formed between the two cutting edges, and determining whether the angle γ meets a preset third preset condition; in response to whether the angle γ meets the preset third preset condition, using the tapping tap to perform trial processing on a sample. The present application solves the problems of high difficulty, low processing efficiency, and high cost in internal thread processing of fasteners by minimizing the tap cutting contact area while ensuring the normal rigidity of the tap.

Description

Technical Field

[0001] The present application belongs to the technical field of fastener tapping, and in particular relates to a tapping tap thread processing method and a tapping tap. Background Art

[0002] In fields such as aerospace, titanium alloy fasteners are widely used because titanium alloy materials have the advantages of low density, light weight, high strength, excellent corrosion resistance, and good high temperature resistance. With the advancement and development of science and technology, the scope of use of titanium alloy fasteners is constantly expanding.

[0003] However, titanium alloy materials also have problems such as rapid tool wear and low consistency in machining accuracy during machining. Among them, the internal thread machining of titanium alloy fasteners has always been a major technical challenge, mainly manifested in the large total torque during tapping, the easy occurrence of surface work hardening during cutting, rapid wear and chipping of the tap teeth, and even being "stuck" in the threaded hole and broken. This is because the elastic modulus of titanium alloy is too small, and the thread surface produces a large rebound, which increases the contact area between the tap and the workpiece, causing a large friction torque and increased wear. Moreover, for non-standard titanium alloy internal threads with a larger diameter than standard threads or a smaller pitch than standard threads, greater friction torque will be generated. The reduction in pitch will further increase the cutting temperature, affecting the machining quality of the internal threads.

[0004] In addition, it is difficult to remove chips when cutting small inner holes, and there is a phenomenon of tool sticking, which makes the internal thread processing of titanium alloy extremely difficult, inefficient and costly. Summary of the Invention

[0005] In view of this, the present application aims to propose a tapping tap thread processing method and a tapping tap, so as to solve the problem that the quality of the internal thread processing of fasteners is affected when using existing tapping taps to process fasteners.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0007] In a first aspect, the present application provides a method for machining a tapping thread, comprising:

[0008] Select the tapping tap of corresponding specifications according to the internal thread specifications of the sample to be processed;

[0009] Measuring an angle α formed by the cutting edge relative to a horizontal plane, and determining whether the angle α meets a first preset condition, wherein the first preset condition satisfies 7°≤α≤10°;

[0010] In response to the angle α satisfying the first preset condition, measuring the angle β formed by the calibration blade relative to the horizontal plane, and determining whether the angle β meets a preset second preset condition, wherein the second preset condition satisfies 4°≤β≤7°;

[0011] In response to the angle β satisfying the second preset condition, measuring the angle γ formed between the two cutting edges, and determining whether the angle γ meets a preset third preset condition, wherein the third preset condition satisfies 55°≤γ≤65°;

[0012] In response to whether the included angle γ meets a preset third preset condition, trial machining the sample using the tapping tap;

[0013] Determine whether the metallographic structure of the internal thread of the sample is qualified. If the metallographic structure of the internal thread of the sample is qualified, use the tapping tap to process the internal thread of the product.

[0014] Further, in response to the included angle α not satisfying the first preset condition, the cutting edge is ground to satisfy the first preset condition;

[0015] In response to the angle β not meeting the second preset condition, the calibration edge is sharpened to meet the second preset condition.

[0016] In response to the angle γ not satisfying the third preset condition, the chip groove is ground to satisfy the third preset condition.

[0017] Furthermore, in response to the metallographic examination of the internal thread of the sample failing to meet the requirements, it is determined whether the angle α, the angle β, and the angle γ meet the preset conditions;

[0018] In response to the preset conditions being met, the tapping tap is replaced with a new specification; in response to the preset conditions not being met, the grinding is continued.

[0019] In a second aspect, based on the same inventive concept, the present application further provides a tapping tap, which uses the tapping tap thread processing method as described in the first aspect, comprising:

[0020] A tap body, wherein the tap body is provided with a plurality of cutting edges, the plurality of cutting edges being evenly distributed along a circumference, the cutting edges being connected to calibrating edges provided on the tap body, and a chip groove provided on the tap body being located between two adjacent cutting edges or calibrating edges;

[0021] A tap shank portion, one end of which is connected to the calibration blade, and the other end of which is provided with a clamping portion.

[0022] Furthermore, the angle formed by the cutting edge relative to the horizontal plane is 7°≤α≤10°.

[0023] Furthermore, the angle formed by the calibration blade relative to the horizontal plane is 4°≤β≤7°.

[0024] Furthermore, the angle formed between the two cutting edges is 55°≤γ≤65°.

[0025] Furthermore, the tapping tap is made of cemented carbide material.

[0026] Compared with the prior art, the tapping tap thread processing method and tapping tap described in this application have the following beneficial effects:

[0027] The present application describes a tapping tap thread processing method and tapping tap that minimizes the tap cutting contact area while maintaining normal tap rigidity, thereby addressing the difficulties, low processing efficiency, and high costs associated with machining internal threads in fasteners. Furthermore, by grinding the tap's chip flutes, the present application facilitates the removal of cutting debris when cutting small internal holes, thus avoiding tool sticking. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0029] Figure 1 This is a flow chart of a tapping tap thread processing method according to an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of an internal thread obtained by machining with an existing tapping tap according to an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the internal thread obtained by the tapping tap according to the embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the structure of a tapping tap according to an embodiment of the present application;

[0033] Figure 5 This is a cross-sectional view of a tapping tap structure described in an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 1-cutting edge; 2-calibrating edge; 3-chip groove; 4-tap shank; 5-clamping part. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0037] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] See also Figure 1 As shown, this embodiment provides a method for processing tap threads, which specifically includes the following steps:

[0039] Step S101: selecting a tapping tap of corresponding specifications according to the specifications of the internal thread of the sample to be processed;

[0040] Step S102, measuring the angle α formed by the cutting edge relative to the horizontal plane, and determining whether the angle α is greater than or equal to 7° and less than or equal to 10°. If 7°≤α≤10°, proceed to step S104; otherwise, proceed to step S103;

[0041] Step S103: Grinding the original cutting edge of the tap to reduce the tapping torque and the cutting temperature, and also to facilitate the subsequent grinding of the calibration edge;

[0042] Step S104, measuring the angle β formed by the calibration blade relative to the horizontal plane, and determining whether the angle β is greater than or equal to 4° and less than or equal to 7°. If 4°≤β≤7°, proceed to step S106; otherwise, proceed to step S105;

[0043] Step S105: Grind the original calibration edge of the tap to prevent double threads and large burrs from forming on the thread;

[0044] Step S106: Measure the angle γ formed between the two cutting edges and determine whether the angle γ is greater than or equal to 55° and less than or equal to 65°. If 55°≤γ≤65°, proceed to step S108; otherwise, proceed to step S107.

[0045] Step S107: Grinding the chip groove of the tap to facilitate chip discharge and make the thread metallographic structure more qualified;

[0046] Step S108: Install the sharpened tap on a tapping machine and use the tap to perform trial processing of the internal thread of the product;

[0047] Step S109: Detect the metallographic structure of the internal thread of the processed sample to determine whether the metallographic structure is qualified. If the metallographic structure is qualified, proceed to step S1012; if the metallographic structure is unqualified, proceed to step S1010;

[0048] Step S1010: Determine whether the angles α, β, and γ of the tap are within the ranges required by steps S102, S104, and S106. If the angles α, β, and γ are within the required ranges, proceed to step S1011; otherwise, repeat steps S102 to S109.

[0049] Step S1011: Replace another tap with the same specification and repeat steps S102 to S109; mark and save the replaced tap for use in processing the next batch of products;

[0050] Step S1012: After the metallographic structure of the sample is qualified, the ground tap is used to process the internal thread of the product.

[0051] The internal thread of the fastener is processed by the tapping tap manufactured by the existing processing method. The metallographic appearance of the internal thread is as follows: Figure 2 As shown, the internal thread metallographic structure obtained by the tapping tap manufactured using the processing method involved in this application is as follows Figure 3 shown.

[0052] The present invention discloses a method for machining tapping threads by minimizing the tap cutting contact area while maintaining normal tap rigidity, thereby addressing the difficulties, low efficiency, and high costs associated with machining internal threads in fasteners. Furthermore, by grinding the tap's chip flutes, the present invention facilitates the removal of cutting debris when cutting small internal holes, thus avoiding tool sticking.

[0053] Based on the same inventive concept, corresponding to any of the above embodiments and methods, the embodiment of the present application further provides a tapping tap, the specific structure of the tapping tap is as follows: Figure 4 The tap is made of cemented carbide, which has high hardness and excellent wear resistance and is suitable for machining titanium alloys.

[0054] Because the internal thread produced by this tap is non-standard, the minor diameter is larger and the pitch is smaller than that of standard threads. The tap comprises a tap body and a shank. The tap body is provided with three cutting edges 1, evenly distributed along the circumference. Three calibrating edges 2 are connected to the three cutting edges 1. A chip flute 3 is located between every two adjacent cutting edges 1 or calibrating edges. The tap's clamping portion 5 and calibrating edges 2 are connected via a shank 4. Figure 5 It is a cross-sectional view of the tap structure in the AA direction. Angle α is the angle formed by the cutting edge 1 relative to the horizontal plane, which satisfies 7°≤α≤10°. Angle β is the angle formed by the calibration edge 2 relative to the horizontal plane, which satisfies 4°≤β≤7°. Angle γ is the angle formed between the two cutting edges 1, which satisfies 55°≤γ≤65°.

[0055] The following comparative analysis is conducted using different angles as an example, specifically taking the product with the imperial diameter code 14 as an example.

[0056] Processing parameters corresponding to different angle combinations

[0057] As can be seen from the table above, by selecting different angle schemes for verification, the axial force, torque, and temperature during the processing are obtained. By comparing the three parameters obtained from different schemes, Scheme 1 has the smallest axial force, torque, and temperature, and is the best scheme. This scheme can obtain smaller axial force, torque, and temperature during the processing process, ensuring the thread processing quality and improving the service life of the tap.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0059] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A method for processing a tapping thread, characterized in that: include: Select the tapping tap of corresponding specifications according to the internal thread specifications of the sample to be processed; Measuring an angle α formed by the cutting edge relative to a horizontal plane, and determining whether the angle α meets a first preset condition, wherein the first preset condition satisfies 7°≤α≤10°; In response to the angle α satisfying the first preset condition, measuring the angle β formed by the calibration blade relative to the horizontal plane, and determining whether the angle β meets a preset second preset condition, wherein the second preset condition satisfies 4°≤β≤7°; In response to the angle β satisfying the second preset condition, measuring the angle γ formed between the two cutting edges, and determining whether the angle γ meets a preset third preset condition, wherein the third preset condition satisfies 55°≤γ≤65°; In response to whether the included angle γ meets a preset third preset condition, trial machining the sample using the tapping tap; Determine whether the metallographic structure of the internal thread of the sample is qualified. If the metallographic structure of the internal thread of the sample is qualified, use the tapping tap to process the internal thread of the product.

2. The method for processing a thread of a tap according to claim 1, wherein: In response to the angle α not meeting the first preset condition, grinding the cutting edge to meet the first preset condition; In response to the angle β not meeting the second preset condition, the calibration edge is sharpened to meet the second preset condition. In response to the angle γ not satisfying the third preset condition, the chip groove is ground to satisfy the third preset condition.

3. The method for processing a thread of a tapping tap according to claim 2, wherein: In response to the metallographic examination of the internal thread of the sample failing to meet the requirements, determining whether the angle α, the angle β, and the angle γ meet the preset conditions; In response to the preset conditions being met, the tapping tap is replaced with a new specification; in response to the preset conditions not being met, the grinding is continued.

4. A tapping tap, using the tapping tap thread processing method according to any one of claims 1 to 3, characterized in that: include: A tap body, wherein the tap body is provided with a plurality of cutting edges, the plurality of cutting edges being evenly distributed along a circumference, the cutting edges being connected to calibrating edges provided on the tap body, and a chip groove provided on the tap body being located between two adjacent cutting edges or calibrating edges; a tap shank, one end of which is connected to the calibration blade, and the other end of which is provided with a clamping portion; The angle formed by the cutting edge relative to the horizontal plane is 7°≤α≤10°; The angle formed by the calibration blade relative to the horizontal plane is 4°≤β≤7°; The included angle formed between the two cutting edges is 55°≤γ≤65°.

5. The tapping tap according to claim 4, characterized in that: The tapping tap is made of hard alloy material.

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