Double-angle guide tooth extrusion tap

Abstract

The application provides a double-angle guide tooth extruding tap, which comprises a tap shank and a tap forming part, the tap forming part comprises a guide part, a correction part and an exit part, the guide part comprises two adjacent high points, namely a first high point and a second high point, the first high point is located at the end of the tap, and the second high point is close to the correction part; the first tooth of the guide part close to the correction part is a third high point; the extruding allowance between the tooth top of the first high point and the tooth top of the second high point is a1, the extruding allowance between the tooth top of the second high point and the tooth top of the third high point is a2, and the extruding allowance a1 is greater than the extruding allowance a2, so that the adjustment of the extruding allowance of the extruding tap is realized, the extruding allowance of the correction part is reasonably transferred to the adjacent second high point, the wear of the correction part is effectively reduced, and the service life of the extruding tap is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of extrusion tap technology, and in particular to a dual-angle guide extrusion tap. Background Technology

[0002] The thread structure of a forming tap generally consists of three parts: a guiding section, a straightening section, and a withdrawal section. The guiding section, also called the guide tooth / lead-end ineffective tooth, serves to initially guide and initiate plastic deformation. Its angle design ensures that the tap's pressure on the workpiece material increases gradually, rather than applying full pressure instantaneously. This avoids sudden excessive torque and reduces the risk of tap breakage. The straightening section's main function is to complete the final plastic forming of the thread and stabilize its dimensions and surface finish. The withdrawal section's main function is at the tap retraction point, ensuring tap strength and preventing stress concentration.

[0003] Current extrusion tap guide teeth generally adopt a single-angle design, with each convex point falling on a straight rotational contour line. The tooth profile is relatively simple. When machining blind holes, especially when facing situations requiring strict control of the tap guide tooth length, the guide tooth length is generally required to be controlled within 0.5P. In this case, the number of convex points is generally 2 to 3. According to the conventional single-angle design, the guide tooth may be subjected to a large extrusion allowance, which will accelerate its wear and reduce its lifespan.

[0004] To address the aforementioned technical problems, this invention provides a novel extrusion tap structure that can reduce the extrusion allowance of the straightening teeth, decrease wear, and extend service life. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this invention proposes an extrusion tap structure with a longer service life.

[0006] A dual-angle guide tooth extrusion tap includes a tap shank and a tap forming part, wherein the tap shank and the tap forming part are respectively disposed at both ends of the extrusion tap.

[0007] The tap forming section includes a guiding section, a correcting section, and an exiting section. The guiding section includes two adjacent high points, a first high point and a second high point. The first high point is located at the end of the tap, and the second high point is close to the correcting section. The first tooth of the correcting section closest to the guiding section is the third high point. Specifically... The compression allowance between the first high point tooth crest and the second high point tooth crest is a1, the compression allowance between the second high point tooth crest and the third high point tooth crest is a2, the slope between the first high point tooth crest and the second high point tooth crest is the first guide angle A1, and the slope between the second high point tooth crest and the third high point tooth crest is the second guide angle A2.

[0008] The extrusion allowance a1 is greater than the extrusion allowance a2, and the first guide angle A1 is greater than the second guide angle A2, thereby enabling the adjustment of the extrusion allowance of the extrusion tap. The extrusion allowance of the correction part is reasonably transferred to the adjacent second high point, effectively reducing the wear of the correction part and greatly improving the life of the extrusion tap.

[0009] Preferably, the ratio of the extrusion allowance a1 to the extrusion allowance a2 is reasonably within the range of 6 / 3 to 5 / 4. While effectively maintaining the initial guiding effect, the extrusion allowance of the correction part is reasonably transferred to the adjacent second high point, which improves the chipping resistance of the tap guide tooth when processing difficult-to-machine materials such as stainless steel and titanium alloy.

[0010] Preferably, the ratio of the extrusion allowance a1 to the extrusion allowance a2 is 5 / 3.

[0011] Preferably, the length of the guide portion is less than the pitch of the tap, and it is a flat-head extrusion tap, suitable for blind holes.

[0012] Preferably, the first high point, the second high point, and the third high point are three adjacent high point positions belonging to the continuous space curve of the tooth crest, and the phase difference between adjacent high point positions is 90°.

[0013] Preferably, the diameter of the tap forming part is 0.8mm to 4.0mm.

[0014] Preferably, the tap shank and the tap forming part are formed as one piece, which has high strength and is less prone to breakage.

[0015] Preferably, the extrusion tap is made of tungsten steel, which has high strength.

[0016] Preferably, the extrusion tap is a curved-edge prismatic tap, and the cross-section of the tap shank is curved-edge prismatic.

[0017] Preferably, the tap forming part rotates gradually along the axial direction of the extrusion tap in the radial cross-section. The main body of the tap forming part is generally left-handed. During use, the gradually left-handed cross-section has a downward component force. The cutting fluid poured onto the tap body will be pressed down into the hole under the action of this component force superimposed on gravity, so that the tap extrusion forming part is cooled more fully, and the tapping quality and tap life are improved.

[0018] As can be seen from the above description of the present invention, the present invention has the following beneficial effects: 1. The extrusion tap provided by the present invention has two guide angles, thereby enabling adjustment of the extrusion allowance of the extrusion tap, reasonably transferring the extrusion allowance of the correction part to the adjacent second high point, effectively reducing the wear of the correction part, and significantly improving the life of the extrusion tap; 2. The ratio of the first guide angle A1 to the second guide angle A2 is reasonably within the range of 6 / 3 to 5 / 4. While effectively maintaining the initial guiding effect, the extrusion allowance of the correction part is reasonably transferred to the adjacent second high point, thereby improving the chipping resistance of the tap guide tooth when processing difficult-to-machine materials such as stainless steel and titanium alloy. 3. The tap forming part rotates gradually along the axial direction of the extrusion tap in the radial cross-section. The main body of the tap forming part is generally left-handed. During use, the gradually left-handed cross-section has a downward component force. The cutting fluid poured onto the tap body will be pressed down into the hole under the action of this component force superimposed on gravity, so that the tap extrusion forming part is cooled more fully, and the tapping quality and tap life are improved. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0020] in: Figure 1 This is a schematic diagram of a single-angle guide tooth; Figure 2 This is a schematic diagram of a dual-angle guide tooth. Figure 1 (To simultaneously show the first, second, and third highest points, the two diagrams with the tap rotated 90° are superimposed.) Figure 3 This is a schematic diagram of a dual-angle guide tooth. Figure 2 (To simultaneously show the first, second, and third highest points, the two diagrams with the tap rotated 90° are superimposed.) Figure 4 This is a schematic diagram illustrating the principle of single / double angle extrusion amount distribution; Figure 5 It is a picture of the actual object where the cross-section of the extrusion tap rotates gradually to the left; Figures 1 to 5 The markings are: Guide Section 1, First High Point 11, Second High Point 12, Correction Section 2, and Third High Point 21. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this invention clearer and more understandable, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] Please see Figure 1 The existing extrusion taps have only one guide angle A in the guide section, such as... Figure 1 As shown, this structure causes the correcting teeth to bear a large extrusion allowance, which accelerates their wear and reduces their lifespan. To solve the above technical problems, this embodiment provides an extrusion tap with two guide angles, which can reasonably transfer the extrusion allowance of the correcting part to the guide part, effectively reduce the wear of the correcting part, and greatly improve the lifespan of the extrusion tap.

[0023] Please see Figures 2 to 4 A dual-angle guide tooth extrusion tap includes a tap shank and a tap forming part, wherein the tap shank and the tap forming part are respectively disposed at both ends of the extrusion tap.

[0024] Preferably, the extrusion tap is made of tungsten steel, which has high strength. In addition, the tap shank and the tap forming part are formed as one piece, making it less prone to breakage.

[0025] The tap forming part includes a guide part 1, a correction part 2, and an exit part.

[0026] The guide portion 1 includes two adjacent high points, namely a first high point 11 and a second high point 12. The first high point 11 is located at the end of the tap, and the second high point 12 is close to the correction portion 2.

[0027] In this embodiment, the length of the guide portion 1 is less than the pitch of the tap, and it is a flat-head extrusion tap, suitable for blind holes.

[0028] The first tooth of the correction section 2 closest to the guide section 1 is the third highest point 21.

[0029] The first high point 11, the second high point 12 and the third high point 21 are three adjacent high point positions belonging to the continuous space curve of the tooth crest, and the phase difference between adjacent high point positions is 90°.

[0030] The compression allowance between the tooth crest of the first high point and the tooth crest of the second high point is a1, the compression allowance between the tooth crest of the second high point and the tooth crest of the third high point is a2, the slope between the tooth crest of the first high point 11 and the tooth crest of the second high point 12 is the first guide angle A1, and the slope between the tooth crest of the second high point 12 and the tooth crest of the third high point 21 is the second guide angle A2.

[0031] The extrusion allowance a1 is greater than the extrusion allowance a2, and the first guide angle A1 is greater than the second guide angle A2, thereby enabling the adjustment of the extrusion allowance of the extrusion tap. The extrusion allowance of the correction part 2 is reasonably transferred to the adjacent second high point 12, effectively reducing the wear of the correction part 2 and greatly improving the life of the extrusion tap.

[0032] Preferably, the ratio of the extrusion allowance a1 to the extrusion allowance a2 is within a reasonable range of 6 / 3 to 5 / 4. While effectively maintaining the initial guiding effect, the extrusion allowance of the correction portion 2 is reasonably transferred to the adjacent second high point 12, improving the chipping resistance of the tap guide teeth when machining difficult-to-machine materials such as stainless steel and titanium alloys. In this embodiment, preferably, the ratio of the extrusion allowance a1 to the extrusion allowance a2 is 5 / 3.

[0033] Based on the above embodiments, the forming tap is a curved-edge prismatic tap, and the cross-section of the tap shank is curved-edge prismatic. Furthermore, the tap forming part gradually rotates along the axial direction of the forming tap in its radial cross-section, and the main body of the tap forming part is generally left-handed, such as... Figure 5 When in use, the gradually left-handed cross-section has a downward component force. The cutting fluid poured onto the tap body will be pressed into the hole under the action of this component force and gravity, so that the extruded part of the tap is cooled more fully, and the tapping quality and tap life are improved.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element 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 invention.

[0035] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A dual-angle guide tooth extrusion tap, characterized in that, It includes a tap shank and a tap forming part, which are respectively disposed at both ends of the extrusion tap; The tap forming part includes a guiding part, a correcting part, and an exiting part. The guiding part includes two adjacent high points, namely a first high point and a second high point. The first high point is located at the end of the tap, and the second high point is close to the correcting part. The first tooth of the correcting part close to the guiding part is the third high point. The compression allowance between the first high point tooth crest and the second high point tooth crest is a1, the compression allowance between the second high point tooth crest and the third high point tooth crest is a2, the slope between the first high point tooth crest and the second high point tooth crest is the first guide angle A1, and the slope between the second high point tooth crest and the third high point tooth crest is the second guide angle A2. The extrusion allowance a1 is greater than the extrusion allowance a2, and the first guide angle A1 is greater than the second guide angle A2.

2. The dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The ratio of the extrusion allowance a1 to the extrusion allowance a2 is 6 / 3 to 5 / 4.

3. The dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The ratio of the extrusion allowance a1 to the extrusion allowance a2 is 5 / 3.

4. The dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The length of the guide portion is less than the pitch of the tap.

5. A dual-angle guide tooth extrusion tap according to claim 4, characterized in that, The first, second, and third high points are three adjacent high point positions belonging to the continuous space curve of the tooth crest, and the phase difference between adjacent high point positions is 90°.

6. The dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The diameter of the tap forming part is 0.8mm to 4.0mm.

7. A dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The tap shank and the tap forming part are formed as one piece.

8. A dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The extrusion tap is made of tungsten steel.

9. A dual-angle guide tooth extrusion tap according to claim 1, characterized in that, The extrusion tap is a curved-edge prismatic tap, and the cross-section of the tap shank is curved-edge prismatic.

10. A dual-angle guide tooth extrusion tap according to claim 9, characterized in that, The tap forming part rotates gradually along the axial direction of the extrusion tap in the radial cross-section, and the main body of the tap forming part is generally left-handed.

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