Thread milling cutter

Abstract

A thread milling cutter, comprising a cutter disc (100), wherein at least four cutter teeth (200) are arranged on the outer periphery of the cutter disc (100) at intervals, the number of the cutter teeth (200) is an even number, and the at least four cutter teeth (200) are uniformly arranged around a rotation axis of the cutter disc (100). Each cutter tooth (200) has a cutting side surface (201), a back side surface (205), and an outer peripheral surface (203); the cutting side surface (201) is connected to the back side surface (205) by means of the outer peripheral surface (203); the distance from the edge where the outer peripheral surface (203) intersects the cutting side surface (201) to the edge where the back side surface (205) intersects the outer peripheral surface (203) is the width of the cutter teeth (200); and the widths of every two adjacent cutter teeth (200) are not equal, and the widths of the two cutter teeth (200) symmetric about the rotation axis of the cutter disc (100) are equal. The arrangement of the cutting teeth disperses the friction force of the milling cutter and facilitates smooth chip removal.

Description

A thread milling cutter Technical Field

[0001] The present application relates to the technical field of precision machining tools, and in particular to a thread milling cutter. Background Art

[0002] Thread milling cutters are used to create threads on workpieces. They have multiple cutting teeth that, as they rotate, cut through holes in the workpiece to create threads. Slots are formed between adjacent teeth to facilitate chip removal. However, existing thread milling cutters have uniform tooth widths, resulting in uniform slot sizes and limited chip removal capacity. This can lead to the accumulation of chip powder, compromising machining results. Summary of the Invention

[0003] The present application provides a thread milling cutter to solve the technical problem that the milling cutter's groove size is uniform and the chip removal capacity is limited, which may cause the accumulation of debris and powder generated during processing and affect the processing effect.

[0004] The present application provides a thread milling cutter, which comprises:

[0005] A cutter disc, wherein at least four cutter teeth are arranged at intervals on the outer periphery of the cutter disc, and the number of the cutter teeth is an even number; the at least four cutter teeth are evenly arranged around the rotation axis of the cutter disc;

[0006] Each of the teeth has a cutting side surface, a back side surface, and an outer peripheral surface; the cutting side surface is located at the front side of the tooth in the direction of rotation; the back side surface is located at the rear side of the tooth in the direction of rotation; the outer peripheral surface is located at the end of the tooth away from the cutter disc; the cutting side surface is connected to the back side surface through the outer peripheral surface; the distance between the edge where the outer peripheral surface and the cutting side surface intersect and the edge where the back side surface and the outer peripheral surface intersect is the width of the tooth;

[0007] The widths of two adjacent blade teeth are not equal, and the widths of two blade teeth that are symmetrical about the center of the blade disc are equal.

[0008] In some embodiments, the outer periphery of the tooth is also provided with a rear angle surface, and the outer periphery is connected to the back side surface through the rear angle surface, and the distance between the edge where the outer periphery intersects with the cutting side surface and the edge where the back side surface intersects with the rear angle surface is the width of the tooth.

[0009] In some embodiments, the tooth also has two end faces located on both sides of the cutting side, namely the front end face and the rear end face, and the edge of the cutting side and the edge of the front and / or rear end face of the tooth constitute a first cutting edge; the front and / or rear end face of the tooth is provided with a plurality of first chip grooves; the edge of the first chip groove facing the first cutting edge and the edge of the front and / or rear end face of the tooth close to the first chip groove constitute a second cutting edge.

[0010] In some embodiments, the first chip removal groove is a straight groove.

[0011] In some embodiments, the first chip groove extends from the intersection of the cutting tooth and the cutting disc to the outer peripheral surface, the back angle surface or the back side surface of the cutting tooth.

[0012] In some embodiments, the width of the first chip flute is 0.02 mm to 2 mm.

[0013] In some embodiments, the number of the first chip flutes is 1 to 30.

[0014] In some embodiments, at least four of the blade teeth are arranged helically.

[0015] In some embodiments, the helix angle of the blade teeth is less than or equal to 60 degrees.

[0016] In some embodiments, the cutter head is further provided with a connecting portion.

[0017] The thread milling cutter provided by the present application has the following beneficial effects: the thread milling cutter of the present embodiment has at least four teeth, and at least four teeth are evenly arranged around the rotating axis of the cutter disc, wherein the widths of two adjacent teeth are not equal, and the widths of two teeth symmetrical about the center of the cutter disc are equal. Compared with milling cutters with the same width of teeth, the friction force on the teeth of the present application is dispersed, and the stress will not be concentrated on one point or one side, making the processing more stable and extending the service life of the tool. Moreover, the total volume of the teeth of the present application is reduced, and the total volume of the tool groove is increased. Not only is the chip removal space of the milling cutter increased, and the chip removal is smoother, but the weight of the milling cutter can also be reduced, thereby improving processing efficiency and reducing production costs.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of a thread milling cutter according to an embodiment of the present application;

[0020] FIG2 is a schematic diagram of the tooth distribution structure of a thread milling cutter according to an embodiment of the present application;

[0021] FIG3 is a structural schematic diagram of a thread milling cutter according to an embodiment of the present application from another perspective;

[0022] FIG4 is an enlarged structural diagram of point A in FIG1 .

[0023] In the figure, 100, cutter disc; 110, connecting part; 200, cutter tooth; 201, cutting side; 202, end face; 2021, front end face; 2022, rear end face; 203, outer peripheral surface; 204, back angle surface; 205, back side; 210, first cutting edge; 220, first chip groove; 230, second cutting edge. DETAILED DESCRIPTION

[0024] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0025] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they cannot be understood as limitations on this application.

[0026] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0027] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0028] Please refer to Figures 1 to 4 together, and the thread milling cutter provided in the embodiment of the present application will now be described.

[0029] As shown in FIG1 and FIG2 , the thread milling cutter of the embodiment of the present application includes a cutter disc 100 , wherein at least four teeth 200 are arranged at intervals on the outer periphery of the cutter disc 100 , and the number of the teeth 200 is an even number; at least four teeth 200 are evenly arranged around the rotation axis of the cutter disc 100 ;

[0030] Wherein, each of the teeth 200 has a cutting side surface 201, a back side surface 205, and an outer peripheral surface 203; the cutting side surface 201 is located at the front side of the tooth 200 in the rotation direction; the back side surface 205 is located at the rear side of the tooth 200 in the rotation direction; the outer peripheral surface 203 is located at the end of the tooth 200 away from the cutter disc 100; the cutting side surface 201 is connected to the back side surface 205 through the outer peripheral surface 203; the distance between the edge where the outer peripheral surface 203 and the cutting side surface 201 intersect and the edge where the back side surface 205 intersects with the outer peripheral surface 203 is the width of the tooth 200 (refer to D1 and D2 in Figure 2), that is, the distance from the edge where the outer peripheral surface 203 and the cutting side surface 201 intersect to the edge where the back side surface 205 intersects with the outer peripheral surface 203;

[0031] The widths of the two adjacent teeth 200 are not equal, and the widths of the two teeth 200 that are symmetrical about the center of the cutter disc 100 are equal, that is, the widths of the two teeth 200 that are symmetrical about the rotation axis of the cutter disc 100 are equal. The equal widths of the two teeth 200 that are symmetrical about the center of the cutter disc 100 can help the milling cutter find the dynamic balance point better when rotating, and avoid abnormal shaking of the thread milling cutter when rotating.

[0032] In some embodiments, as shown in Figures 1 and 2, the number of teeth 200 is four, and the widths of two adjacent teeth 200 are different, that is, D1 is not equal to D2 and D1 is smaller than D2; the space between two adjacent teeth 200 is a knife groove, that is, two adjacent teeth are connected by the knife groove, and the volumes of the two knife grooves symmetrical about the center of the cutter disc 100 are the same, and the two adjacent knife grooves are different. In the present application, the widths of the centrally symmetrical teeth are equal, while the widths of the non-centrally symmetrical teeth are unequal. Compared with the scheme with equal tooth widths, the friction force on the teeth of the present application is dispersed, and the stress will not be concentrated on one point or one side, making the processing more stable and extending the service life of the tool; and because D1 is smaller than D2, the total volume of the four teeth 200 in this embodiment is smaller than that of a milling cutter with the same tooth width and a width of D2, the total volume of the tool groove is increased, the chip removal is smoother, and the weight of the milling cutter can be reduced to improve processing efficiency and reduce production costs; and compared with a milling cutter with the same tooth width and a width of D1, the scheme of the present application has relatively more second cutting edges 230 on the teeth, has high processing strength, and the strength of the milling cutter of the present application is more moderate, which relatively improves the service life of the milling cutter.

[0033] In addition, the number of the cutting teeth 200 on the cutter disc 100 can be set according to actual conditions, and can be set to six, eight, ten, etc. cutting teeth.

[0034] In some embodiments, the outer periphery of the tooth 200 is further provided with a relief angle surface 204. The outer periphery 203 is connected to the back side surface 205 via the relief angle surface 204. The distance between the edge where the outer periphery 203 intersects the cutting side surface 201 and the edge where the back side surface 205 intersects the relief angle surface 204 is the width of the tooth 200 (see D2 in Figures 2 and 4), i.e., the distance from the edge where the outer periphery 203 intersects the cutting side surface 201 to the edge where the back side surface 205 intersects the relief angle surface 204. In some embodiments, the outer periphery 203 of the tooth 200 is the surface of the tooth 200 facing away from the cutter head 100 and is a cylindrical surface. The relief angle surface 204 connects the outer periphery 203 and the back side surface 205 of the tooth 200. The relief angle surface 204 is a flat surface and forms a gap with the machined surface of the workpiece, thereby reducing friction and reducing the heat generated by the tooth 200 during machining.

[0035] In some embodiments, referring to Figures 3 and 4 , the tooth 200 forms two end surfaces 202 in the axial direction of the cutter head 100. Specifically, the tooth 200 has two end surfaces 202, including a front end surface 2021 and a rear end surface 2022. The two end surfaces 202 of the tooth 200 are located on either side of the cutting side surface 201 of the tooth 200. The edges of the cutting side surface 201 of the tooth 200 and the edges of the front and / or rear end surfaces 202 of the tooth 200 (the edges of the end surfaces 202 adjacent to the cutting side surface 201) form a first cutting edge 210. In some embodiments, the intersection of the cutting side surface 201 and the front and / or rear end surfaces 202 of the tooth 200 forms the cutting edge of the first cutting edge 210. The cutting edge and the solid edge adjacent to the cutting edge form the first cutting edge 210, which cuts the workpiece using the cutting edge. In some embodiments, the front and / or rear end surfaces 202 of the tooth 200 are provided with a plurality of first chip removal flutes 220. In some embodiments, the edge of the first chip flute 220 facing the first cutting edge 210 and the edge of the front and / or rear end face 202 of the tooth 200 adjacent to the first chip flute 220 constitute a second cutting edge 230, i.e., the second cutting edge 230 is formed on both end faces 202 of the tooth 200. In some embodiments, the edge where the groove surface of the first chip flute 220 intersects with the end face 202 of the tooth 200 constitutes the cutting edge of the second cutting edge 230, which faces the first cutting edge 210. The cutting edge and the solid edge adjacent to the cutting edge form the second cutting edge 230, i.e., the second cutting edge 230 can cut the portion of the workpiece that abuts the end face 202.

[0036] During one rotation cutting process of the thread milling cutter, the second cutting edge 230 can perform a second cutting on the position cut by the first cutting edge 210, so that the size of the part cut by the thread milling cutter can be closer to the design size, thereby improving the processing accuracy. It can also reduce the number of times the first cutting edge 210 cuts the same cutting part, reduce the degree of wear of the first cutting edge 210, ensure that the first cutting edge 210 can achieve the expected cutting effect, ensure that the processing is carried out normally, make the processing more stable, and the processed thread has good retention, high thread finish, and long tool life.

[0037] In some embodiments, as shown in FIG2 , the first chip flute 220 can also be configured as a linear flute. That is, the first chip flute 220 runs in a straight line, and the second cutting edge 230 formed by the flute surface of the first chip flute 220 and the end surface 202 of the tooth 200 is also a straight line. The linear chip flute facilitates the discharge of debris and powder, thereby preventing the debris and powder from affecting the cutting process.

[0038] Based on the above, referring to FIG2 , in some embodiments, the first chip flute 220 extends from the intersection of the end surface 202 of the tooth 200 and the cutter head 100 to the outer peripheral surface 203, the relief surface 204, or the back surface 205 of the tooth 200. The ports at both ends of the first chip flute 220 are not connected to the first cutting edge 210, so that the debris and powder discharged from the first chip flute 220 will not hinder the cutting of the thread milling cutter, allowing the cutting to proceed normally.

[0039] In addition, the shape of the first chip groove 220 can be adjusted according to actual conditions, such as setting the first chip groove 220 to be curved.

[0040] In order to ensure the chip removal effect of the first chip removal groove 220, in some embodiments, the width of the first chip removal groove 220 is 0.02 mm to 2 mm. In some embodiments, the width of the first chip removal groove 220 is 1 mm.

[0041] In some embodiments, the number of the first chip removal grooves 220 is 1 to 30. The number of the first chip removal grooves 220 can be adjusted according to actual needs. In some embodiments, the number of the first chip removal grooves 220 is 6.

[0042] It should be noted that, referring to Figures 1 and 2, in some embodiments, at least four of the cutter teeth 200 are arranged helically, i.e., the cutting side surface 201 is helical. The cutting edge of the first cutting edge 210 formed by the intersection of the cutting side surface 201 and the front end surface 202 is also helical, for thread processing. In some embodiments, to accommodate most thread processing, the helix angle of the cutter teeth 200 is less than or equal to 60 degrees. Of course, in other embodiments, the cutter teeth may also be arranged non-helically.

[0043] In some embodiments, in order to facilitate connection with the knife rod, the knife disc 100 further has a connecting portion 110 to facilitate connection with the knife rod.

[0044] To sum up, the thread milling cutter of this embodiment has at least four teeth 200, and at least four teeth 200 are evenly arranged around the rotating axis of the cutter disc 100, wherein the widths of two adjacent teeth 200 are not equal, and the widths of the two teeth 200 symmetrical about the center of the cutter disc 100 are equal. Compared with the milling cutter with the same width of the teeth 200, the friction force on the teeth 200 of this application is dispersed, and the stress will not be concentrated on one point or one side, making the processing more stable and extending the service life of the tool. Moreover, the total volume of the teeth 200 of this application is reduced, and the total volume of the tool groove is increased. Not only the chip removal space of the milling cutter is increased and the chip removal is smoother, but also the weight of the milling cutter can be reduced, thereby improving processing efficiency and reducing production costs.

[0045] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present application. These improvements and replacements should also be regarded as the scope of protection of the present application.

Claims

1. A thread milling cutter, characterized in that: include: A cutter disc, wherein at least four cutter teeth are arranged at intervals on the outer periphery of the cutter disc, and the number of the cutter teeth is an even number; the at least four cutter teeth are evenly arranged around the rotation axis of the cutter disc; Each of the teeth has a cutting side surface, a back side surface, and an outer peripheral surface; the cutting side surface is located at the front side of the tooth in the direction of rotation; the back side surface is located at the rear side of the tooth in the direction of rotation; the outer peripheral surface is located at the end of the tooth away from the cutter disc; the cutting side surface is connected to the back side surface through the outer peripheral surface; the distance from the edge where the outer peripheral surface and the cutting side surface intersect to the edge where the back side surface and the outer peripheral surface intersect is the width of the tooth; The widths of two adjacent blade teeth are not equal, and the widths of two blade teeth that are symmetrical about the center of the blade disc are equal.

2. The thread milling cutter according to claim 1, characterized in that The outer periphery of the tooth is also provided with a back angle surface, and the outer periphery is connected to the back side surface through the back angle surface. The distance from the edge where the outer periphery intersects with the cutting side surface to the edge where the back side surface intersects with the back angle surface is the width of the tooth.

3. The thread milling cutter according to claim 2, characterized in that The tooth also has two end faces located on both sides of the cutting side, namely the front end face and the rear end face. The edge of the cutting side and the edge of the front and / or rear end face of the tooth constitute a first cutting edge; the front and / or rear end face of the tooth is provided with a plurality of first chip grooves; the edge of the first chip groove facing the first cutting edge and the edge of the front and / or rear end face of the tooth close to the first chip groove constitute a second cutting edge.

4. The thread milling cutter according to claim 3, characterized in that The first chip removal groove is a straight groove.

5. The thread milling cutter according to claim 4, characterized in that The first chip removal groove extends from the intersection of the cutter tooth and the cutter disc to the outer peripheral surface, the back angle surface or the back side surface of the cutter tooth.

6. The thread milling cutter according to claim 3, characterized in that The width of the first chip removal groove is 0.02 mm to 2 mm.

7. The thread milling cutter according to claim 3, characterized in that The number of the first chip removal grooves is 1 to 30.

8. The thread milling cutter according to claim 1, wherein: At least four of the blade teeth are arranged helically.

9. The thread milling cutter according to claim 8, characterized in that The helix angle of the blade teeth is less than or equal to 60 degrees.

10. The thread milling cutter according to claim 1, wherein The cutter head is further provided with a connecting portion.

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