Nut screw tap

Abstract

The invention provides a nut tap, and relates to the technical field of taps, the nut tap comprises a handle part, a calibration part, a cutting part and a chip groove, the cutting part comprises a plurality of blade parts, the blade parts comprise wide blades and narrow blades with different widths, the chip groove is arranged between the adjacent blade parts, the wide blades and the narrow blades comprise a plurality of cutting teeth, the cutting teeth are provided with cutting blades, and the cutting teeth are provided with cutting teeth. At least part of the cutting teeth are provided with supporting edges, and the diameter of each supporting edge is smaller than or equal to the diameter of the cutting edge on the same cutting tooth. Through the arrangement of the wide blade, in the cutting process, the wide blade can play a good supporting role, the cutting stability and balance force of the nut tap are improved, the precision of a threaded hole is improved under the condition that the rigidity condition of the nut tap is poor, the abrasion uniformity of the nut tap is improved, and the coping frequency is increased; the cutting stability and the balance force of the nut tap are further improved, and the service life of the nut tap is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of taps, in particular to a nut tap. Background Art

[0002] At present, in the usage scenarios of nut taps, the operating conditions of nut taps are generally at a poor level. During the tapping process, the nut taps often shake too much, resulting in uneven cutting, unqualified go / no-go gauges, and low tap life. In severe cases, the tap may even break directly. Especially under the condition of poor rigidity of the tapping equipment, the above problems are more serious. At present, it is difficult to further improve the service life of nut taps. In view of the above defects, the present application is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a nut tap, improve the cutting stability of the nut tap, increase the service life of the nut tap, and solve the problems of uneven cutting and short tap life of traditional nut taps.

[0004] In order to solve the above problems, the present invention provides a nut tap, comprising a shank, a calibration portion, a cutting portion and a chip removal groove, wherein the cutting portion comprises a plurality of blade portions, wherein the blade portion comprises a wide blade and a narrow blade with different widths, wherein the width of the wide blade is greater than the width of the narrow blade, and the blade width is increased, thereby improving the cutting stability and balance of the nut tap, and can improve the accuracy of the threaded hole of the nut tap under poor rigidity conditions, improve the wear uniformity of the nut tap, and increase the number of grinding times, thereby correspondingly improving the life of the nut tap; the chip removal groove is arranged between adjacent blade portions, and the wide blade and the narrow blade both comprise a plurality of cutting teeth, wherein the cutting teeth are provided with cutting edges, and at least some of the cutting teeth are provided with supporting ridges, and the supporting ridges are located at the rear of the cutting edges. During the tapping process, after the cutting edges have cut, the rear supporting ridges immediately follow up and directly support the hole wall of the nut, thereby increasing the support points and improving the cutting stability and balance of the nut tap, and the diameter at the supporting ridges is ≤ the diameter of the cutting edges on the same cutting teeth.

[0005] According to an embodiment of the present invention, the cutting portion is a step-shaped cutting edge, and the diameter of the step-shaped cutting edge gradually increases from the cutting portion to the calibration portion.

[0006] Currently, the cutting cones of commonly used nut taps are generally longer, and the cutting amount of a single tooth is very small. The iron chips produced by cutting are thin and tough, and the iron chips are not easy to break. If the iron chips are too long, it will lead to poor chip removal. The stepped blade shape can change the cutting thickness of each blade, thereby controlling the thickness of the iron chips. Controlling the thickness of the iron chips can control the shaping of the iron chips. Increasing the thickness of the iron chips is more conducive to the breaking of the iron chips. Small iron chips are more conducive to chip removal, which can improve the chip blockage caused by long iron chips, thereby affecting the breakage of the tap.

[0007] Optionally, the stepped edge includes a cutting edge and a transition edge, and the cutting edge is straight or inclined, and the number of steps is not less than two.

[0008] According to an embodiment of the present invention, the narrow blades are arranged in a discontinuous distribution, that is, adjacent blade portions cannot all be narrow blades.

[0009] According to an embodiment of the present invention, at least four groups of chip grooves are provided, the width of each group of chip grooves is consistent, and they are arranged in a non-uniform distribution, and the number of cutting edges is set accordingly.

[0010] According to an embodiment of the present invention, the number of the wide blades is greater than half of the total number of blades.

[0011] Optionally, the widths of several wide blades are the same or different, and the widths of several narrow blades are the same or different. When the widths are different, the minimum width in the width range of the wide blade is greater than the maximum width in the width range of the narrow blade.

[0012] Furthermore, the width ratio of the wide blade to the narrow blade is 1.1~2:1, and the specific width value is adjusted according to different specifications.

[0013] According to an embodiment of the present invention, a plurality of supporting edges may be provided on one cutting tooth, and the number of cutting edges provided with supporting edges is greater than half of the total number of cutting edges.

[0014] Furthermore, the supporting edge may be arranged in the middle of the cutting tooth or at the tail end of the cutting tooth.

[0015] According to an embodiment of the present invention, the difference between the diameter of the cutting edge on the same cutting tooth and the diameter at the supporting edge is ≤0.015 m.

[0016] According to an embodiment of the present invention, the supporting edges are arranged in a linear distribution or a spiral distribution.

[0017] The beneficial effect of the present invention is that, through the setting of the wide blade, the wide blade can play a good supporting role during the cutting process, thereby improving the cutting stability and balance of the nut tap, improving the accuracy of the threaded hole of the nut tap under poor rigidity conditions, improving the wear uniformity of the nut tap, increasing the number of grinding times, and increasing the service life of the nut tap.

[0018] By setting the supporting ridges, during the tapping process, after the cutting edge cuts, the following supporting ridges will immediately follow up and directly support the hole wall of the nut, thereby increasing the supporting points and further improving the cutting stability and balance of the nut tap. The accuracy of the threaded hole can be improved under poor rigidity conditions of the nut tap, the wear uniformity of the nut tap is improved, and the service life of the nut tap is further increased.

[0019] By setting a stepped cutting edge and controlling the thickness of the iron chips, increasing the thickness of the iron chips is more conducive to chip breaking and chip removal, reducing the probability of tap breakage due to poor chip removal, and improving the problem of chip blockage caused by long iron chips, which affects the service life of the nut tap. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the invention or the technical solutions in 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the nut tap in Example 1;

[0023] Figure 2 is a schematic cross-sectional view of a nut tap in Example 1;

[0024] Figure 3 Schematic diagram of the overall structure of the nut tap in Example 2;

[0025] Figure 4 It is a schematic diagram of the main structure of the nut tap in Example 2;

[0026] Figure 5 is a schematic cross-sectional view of a nut tap in Example 2;

[0027] Figure 6 It is a schematic diagram of the dimensional relationship between the supporting edge and the cutting edge;

[0028] Figure 7 It is a schematic diagram of the overall structure of the nut tap in Example 3;

[0029] Figure 8 It is a schematic diagram of the main structure of the nut tap in Example 3;

[0030] Fig. 9 Schematic diagram of two types of stepped cutting edges;

[0031] Fig.10 Schematic diagram of the cutting section after the cutting teeth are hidden. DETAILED DESCRIPTION

[0032] The following description is only used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only for example, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not deviate from the spirit and scope of the present invention.

[0033] Embodiment 1:

[0034] A nut tap, such as Figure 1 , Figure 2 , including a shank 1, a cutting segment and a chip groove 4, wherein the rear end of the cutting segment is a calibration portion 2 and the front end is a cutting portion 3.

[0035] The cutting section includes a plurality of blades 36, and the blades 36 include wide blades 30 and narrow blades 31 of different widths. The chip grooves 4 are arranged between adjacent blades 36, and the narrow blades 31 are arranged in a non-continuous distribution, that is, adjacent blades 36 cannot all be narrow blades 31. In this embodiment, the blades 36 are arranged in five groups, of which the wide blades 30 are three groups, the narrow blades 31 are two groups, and the chip grooves 4 are arranged in four groups. The width of each group of chip grooves 4 is consistent, and they are unevenly distributed on the cutting section.

[0036] Optionally, the widths of several wide blades 30 are the same or different, and the widths of several narrow blades 31 are the same or different. When the widths are different, the minimum width in the width range of the wide blade 30 is greater than the maximum width in the width range of the narrow blade 31 .

[0037] Preferably, the width ratio of the wide blade 30 to the narrow blade 31 is 1.1-2:1, and the specific width value is adjusted according to different specifications of the tap.

[0038] During the cutting process, the wide blade can play a good supporting role, and the width of the groove does not change. The nut tap reasonably distributes the groove type while ensuring sufficient chip removal space, increases the blade width, improves the cutting stability and balance of the nut tap, improves the accuracy of the threaded hole under poor rigidity conditions, improves the wear uniformity of the nut tap, and after increasing the blade width, the number of grinding times can be increased, thereby increasing the life of the nut tap.

[0039] Embodiment 2:

[0040] On the basis of Example 1, Figure 3-Figure 6 The wide blade 30 and the narrow blade 31 each include a plurality of cutting teeth 37, such as Figure 5 A cutting edge 32 is provided on the cutting tooth 37, and a supporting ridge 33 is provided on at least part of the cutting tooth 37. The supporting ridge 33 is located at the rear of the cutting edge 32, and the diameter at the supporting ridge 33 is ≤ the diameter of the cutting edge 32 on the same cutting tooth.

[0041] Preferably, the difference between the diameter of the cutting edge 32 on the same cutting tooth and the diameter at the supporting edge 33 is ≤0.015m, that is: Figure 6 The diameter dimension of the supporting edge 33 is smaller than the diameter dimension of the cutting edge 32 at the same position, and the smaller dimension shall not exceed 0.015m, and preferably be within 0.005m to avoid the supporting edge 33 being too small and losing its supporting function.

[0042] One or more supporting ridges 33 may be provided on one cutting tooth 37 . In this embodiment, one supporting ridge 33 is provided on one cutting tooth 37 , and the supporting ridge 33 may be provided at the middle position of the cutting tooth 37 .

[0043] Preferably, the number of blades 36 provided with supporting edges 33 is greater than half of the total number of blades 36, that is, when five groups of blades 36 are provided in the present embodiment, at least three groups of blades 36 have supporting edges 33 on some of their cutting teeth 37, and the three groups of blades 36 are three discontinuous groups, so as to avoid too few supporting edges 33 affecting the balancing force.

[0044] In this embodiment, Figure 3 , Figure 4 The supporting ridges 33 are arranged on each cutting tooth 37 of the cutting portion 3 and are distributed in a linear shape. In other embodiments, the supporting ridges 33 may be distributed in a spiral shape.

[0045] During the tapping process, after the cutting edge 32 of the tap has cut, the supporting edge 33 behind it immediately follows up and directly supports the hole wall of the nut, thereby increasing the supporting points, improving the cutting stability and balance of the nut tap, and can improve the accuracy of the threaded hole of the nut tap under poor rigidity conditions, improve the wear uniformity of the nut tap, and correspondingly increase the life of the nut tap.

[0046] Embodiment 3:

[0047] On the basis of Example 2, Figure 7-Figure 10 , the cutting portion 3 is a stepped edge, the number of steps is not less than two, such as Fig.10 , Fig.10 The cutting teeth are hidden in the figure. In this embodiment, three groups of steps are provided, and the diameter of the stepped cutting edge gradually increases from the cutting part 3 to the calibration part 2.

[0048] The stepped blade shape can change the cutting thickness of each blade, thereby controlling the thickness of the iron chips. Controlling the thickness of the iron chips can control the shaping of the iron chips. Increasing the thickness of the iron chips is more conducive to the breaking of the iron chips. Small iron chips are more conducive to chip removal, reducing the probability of tap breakage due to poor chip removal, and can improve the problem of chip blockage caused by long iron chips, which affects the service life of the nut tap.

[0049] Specifically, the stepped edge includes a cutting edge 35 and a transition edge 34, which include two types, such as Fig. 9 The stepped edge is type A or type B, the cutting edge 35 in type A is straight, and the cutting edge 35 in type B is inclined.

[0050] In the type A inclined type, each tooth at the cutting edge 35 will participate in the cutting, the wear should be uniform, and the transition edge 34 only serves as a pure transition connection.

[0051] In the type B straight type, the tooth profile near the edge is cut first, and after the previous tooth is worn, the tooth profile behind will participate in the cutting, and the transition edge 34 also participates in the cutting.

[0052] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed and modified in any way without departing from the principles.

Claims

1. A nut tap, characterized in that: The invention comprises a shank (1), a calibration portion (2), a cutting portion (3) and a chip removal groove (4), wherein the cutting portion (3) comprises a plurality of blade portions (36), wherein the blade portion (36) comprises a wide blade (30) and a narrow blade (31) of different widths, wherein the chip removal groove (4) is arranged between adjacent blade portions (36), wherein the wide blade (30) and the narrow blade (31) each comprise a plurality of cutting teeth (37), wherein a cutting edge (32) is arranged on the cutting tooth (37), and at least some of the cutting teeth (37) are provided with a supporting edge (33), wherein the diameter at the supporting edge (33) is ≤ the diameter of the cutting edge (32) on the same cutting tooth.

2. The nut tap according to claim 1, characterized in that: The cutting portion (3) is a stepped cutting edge, and the diameter of the stepped cutting edge gradually increases from the cutting portion (3) to the calibration portion (2).

3. The nut tap according to claim 2, characterized in that: The stepped edge comprises a cutting edge (35) and a transition edge (34); the cutting edge (35) is straight or inclined.

4. The nut tap according to any one of claims 1 to 3, characterized in that: The narrow blades (31) are arranged in a discontinuous distribution.

5. The nut tap according to claim 4, characterized in that: At least four groups of the chip removal grooves (4) are provided, and the width of each group of chip removal grooves (4) is consistent, and they are arranged in a non-uniform distribution.

6. The nut tap according to claim 5, characterized in that: The number of the wide blades (30) is greater than half of the total number of blade portions (36).

7. The nut tap according to claim 5 or 6, characterized in that: The widths of the plurality of wide blades (30) are the same or different, and the widths of the plurality of narrow blades (31) are the same or different.

8. The nut tap according to claim 5 or 6, characterized in that: A plurality of supporting edges (33) may be provided on one cutting tooth (37), and the number of cutting edges (36) provided with supporting edges (33) is greater than half of the total number of cutting edges (36).

9. The nut tap according to claim 8, characterized in that: The difference between the diameter of the cutting edge (32) on the same cutting tooth and the diameter at the supporting edge (33) is ≤0.015 m.

10. The nut tap according to claim 8, characterized in that: The supporting edges (33) are arranged in a linear distribution or a spiral distribution.

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