Ball nose cutter for easy welding

Abstract

The utility model belongs to milling technology field provides a ball head milling cutter convenient to weld, including integrative connection's cutter body and handle, the cutter body is hemispherical, the one end of cutter body's back to handle is end plane, be provided with a plurality of blade mounting groove on the circumference lateral surface of cutter body, be installed with cutting blade in blade mounting groove, its characterized in that, the first mounting surface of cutting blade is connected on the second mounting surface of blade mounting groove, the first mounting surface is opposite the relief of cutting blade and sets up, the second mounting surface is close to the handle one end opposite the inclination degree of end plane on the second mounting surface is less than the inclination degree of other positions opposite end plane on the second mounting surface, so that the second mounting surface can hold up cutting blade in the axial direction of cutter body. The ball head milling cutter convenient to weld provided by the utility model embodiment has the advantages of high welding yield.

Description

Technical Field

[0001] This utility model belongs to the field of milling technology, and in particular relates to a ball end mill that is easy to weld. Background Technology

[0002] Ball end mills have a rounded cutting edge, making them suitable for machining complex curved surfaces, cavities, and 3D contours. Existing ball end mill inserts are generally mounted in insert mounting slots on the circumferential side of the cutter body, using welding or fastener connections. Examples include ball end mills and their machining methods disclosed in CN113857541A (for machining universal joint ball cages), CN203109327U (for ball end mills with welded diamond tips), and CN223277235U (for CVJ ball end mills). However, in these disclosed ball end mills, only one inclined surface contacts the insert in the insert mounting slot, failing to provide support during insert welding. Currently, when CBN inserts are welded to the cutter head in a vacuum furnace, the insert often slips off the cutter head during the melting of the solder paste, rendering the cutter unusable for grinding and thus scrapping it. Therefore, there is an urgent need to improve the base structure of ball end mills to facilitate welding and solve the problem of insert sheet detachment during welding in existing ball end mills. Utility Model Content

[0003] To overcome the problems existing in related technologies, this application provides a ball end mill that is easy to weld.

[0004] According to an embodiment of this application, a ball end mill that is easy to weld is provided, comprising an integrally connected cutter body and a cutter shank. The cutter body is hemispherical, and the end of the cutter body facing away from the cutter shank is an end plane. A plurality of insert mounting slots are provided on the circumferential side of the cutter body, and cutting inserts are installed in the insert mounting slots. The cutting insert has a first mounting surface that is in contact with a second mounting surface of the insert mounting slot. The first mounting surface is disposed opposite to the flank face of the cutting insert. The inclination of the end of the second mounting surface near the cutter shank relative to the end plane is less than the inclination of other positions on the second mounting surface relative to the end plane, so that the second mounting surface can support the cutting insert in the axial direction of the cutter body.

[0005] In some embodiments, the second mounting surface is configured with a support plane and a support arc surface at the end near the tool holder to support the cutting blade, and the second mounting surface away from the tool holder is configured with an inclined surface, which is smoothly connected to the support plane through the support arc surface.

[0006] In some embodiments, the second mounting surface is configured as a support plane near the tool holder to support the cutting blade, and the second mounting surface away from the tool holder is configured as an inclined plane, which intersects and connects with the support plane.

[0007] In some embodiments, the support plane is arranged parallel to the end plane.

[0008] In some embodiments, the end of the second mounting surface near the tool holder is configured as a support arc surface capable of supporting the cutting blade, and the end of the second mounting surface away from the tool holder is configured as an inclined surface, the inclined surface being smoothly connected to the support arc surface.

[0009] In some embodiments, the center of the cutter body and the center of the cutter shank are provided with a main channel that runs through each other, and two flow channel holes are provided at intervals on the circumferential side of the cutter body at the position of the arc-shaped cutting edge opposite to the cutting blade, and the flow channel holes are connected to the main channel.

[0010] In some embodiments, a positioning plane is also provided on the circumferential side of the blade near the handle.

[0011] In some embodiments, the positioning planes are provided as a plurality of planes, which are arranged symmetrically on the blade body.

[0012] In some embodiments, a chip removal groove is provided on the circumferential side of the cutter body on the side of each blade mounting slot, the chip removal groove having a chip removal groove guide wall, and the second mounting surface is located outside the chip removal groove guide wall in the radial direction of the cutter body.

[0013] In some embodiments, the tool holder includes a tapered positioning cylinder and a mounting cylinder. The large end of the tapered positioning cylinder is connected to the tool body, and the small end of the tapered positioning cylinder is connected to the mounting cylinder. A positioning end face is provided on one end of the tool body facing the tapered positioning cylinder, and a torque transmission plane is machined on the outer circumferential surface of the mounting cylinder.

[0014] This utility model provides a ball end mill that is easy to weld. Because the inclination of the end plane of the second mounting surface near the tool holder is less than the inclination of the end plane of other positions on the second mounting surface, when the solder paste between the cutting insert and the second mounting surface sinters and melts, the second mounting surface can support the cutting insert in the axial direction of the tool body, preventing the cutting insert from slipping off the tool body during welding, and preventing the ball end mill from being scrapped due to the inability to grind, thereby effectively improving the welding yield of the ball end mill. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is one of the three-dimensional structural schematic diagrams of a ball end mill that is easy to weld, provided as a specific embodiment of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of a ball end mill that is easy to weld, omitting the cutting insert, according to a specific embodiment of the present invention.

[0018] Figure 3 This is the second three-dimensional structural diagram of a ball end mill that is easy to weld, provided as a specific embodiment of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of a cutting blade provided in a specific embodiment of the present invention.

[0020] The following labels are used in the attached diagram:

[0021] 1. Tool body; 11. Tool mounting slot; 111. Second mounting surface; 1111. Support plane; 1112. Support arc surface; 1113. Inclined surface; 12. End plane; 13. Flow channel hole; 14. Positioning plane; 15. Chip removal groove; 151. Chip removal groove guide wall; 16. Positioning end face;

[0022] 2. Tool holder; 21. Conical positioning cylinder; 22. Mounting cylinder; 221. Torque transmission plane;

[0023] 3. Cutting insert; 31. Curved cutting edge; 32. First mounting surface; 33. Rake face; 34. Front face;

[0024] 4. Mainstream path. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please refer to Figures 1 to 4 , Figure 1This is one of the three-dimensional structural schematic diagrams of a ball end mill that is easy to weld, provided in a specific embodiment of this utility model; Figure 2 This is a three-dimensional structural diagram of a ball end mill that is easy to weld and has no cutting insert, according to a specific embodiment of the present invention. Figure 3 This is a second three-dimensional structural schematic diagram of a ball end mill that is easy to weld, provided in a specific embodiment of this utility model. Figure 4 This is a three-dimensional structural diagram of a cutting blade provided in a specific embodiment of the present invention.

[0027] This utility model provides a ball end mill that is easy to weld, comprising an integrally connected cutter body 1 and a cutter shank 2, wherein the cutter body 1 is hemispherical. The end of the cutter body 1 facing away from the cutter shank 2 is an end face 12. A plurality of insert mounting slots 11 are provided on the circumferential side of the cutter body 1, and cutting inserts 3 are installed in the insert mounting slots 11. The cutting inserts 3 have arc-shaped cutting edges 31, which protrude radially outward from the circumferential side of the cutter body 1. The first mounting surface 32 of the cutting insert 3 is attached to the second mounting surface 111 of the insert mounting slot 11. The first mounting surface 32 is opposite to the flank face 33 of the cutting insert 3. The inclination of the second mounting surface 111 near the end face 2 relative to the end face 12 is less than the inclination of other positions on the second mounting surface 111 relative to the end face 12, so that the second mounting surface 111 can support the cutting insert 3 in the axial direction of the cutter body 1.

[0028] The ball end mill provided in this embodiment of the invention facilitates welding. Because the inclination of the end plane 12 of the second mounting surface 111 near the end of the shank 2 is less than the inclination of other positions of the second mounting surface 111 relative to the end plane 12, when the solder paste between the cutting insert 3 and the second mounting surface 111 is sintered and melted, the second mounting surface 111 can support the cutting insert 3 in the axial direction of the cutter body 1, preventing the cutting insert 3 from slipping off the cutter body 1 during welding, and preventing the ball end mill from being scrapped due to the inability to grind, thereby effectively improving the welding yield of the ball end mill.

[0029] Therefore, the ball end mill provided in this embodiment of the invention has the advantage of high welding yield.

[0030] Preferably, in some embodiments, the second mounting surface 111 is provided with a support plane 1111 and a support arc surface 1112 near the tool holder 2 to support the cutting blade 3, and the second mounting surface 111 is provided with an inclined surface 1113 away from the tool holder 2. The inclined surface 1113 is smoothly connected to the support plane 1111 through the support arc surface 1112. When the second mounting surface 111 near the tool holder 2 includes both the support plane 1111 and the support arc surface 1112, the support arc surface 1112 is equivalent to an arc surface formed by a rounded corner between the inclined surface 1113 and the support plane 1111. This not only reduces stress concentration and improves the structural strength of the cutting blade 3 and the blade mounting groove 11, but also, since the outermost part of the second mounting surface 111 is a support plane 1111 with a constant inclination, the second mounting surface 111 can provide more stable support for the cutting blade 3.

[0031] Optionally, in some embodiments, the end of the second mounting surface 11 near the tool holder 2 is configured as a support plane 1111 capable of supporting the cutting blade 3, and the end of the second mounting surface 111 away from the tool holder 2 is configured as an inclined plane 1113. The inclined plane 1113 intersects and connects with the support plane 1111, that is, the two have different inclinations and a certain angle between them. When the end of the second mounting surface 111 away from the tool holder 2 is configured as the support plane 1111, the second mounting surface 111 can provide more stable support for the cutting blade 3. However, the inclined plane 1113 of the second mounting surface 111 of the blade mounting groove 11 and the support plane 1111 cannot transition smoothly between each other and the two planes of the first mounting surface 32 of the cutting blade 3. The strength of the blade mounting groove 11 and the matching cutting blade 3 does not transition smoothly.

[0032] Based on the above embodiments, the support plane 1111 is arranged parallel to the end plane 12. When the support plane 1111 is arranged parallel to the end plane 12, it can provide better support for the cutting blade 3 while ensuring the strength of the support plane 1111. In addition, the support plane 1111 is also easier to process. Of course, in other embodiments, the support plane 1111 can also be tilted at a small angle relative to the end plane 12, which can also provide support for the blade.

[0033] Optionally, in some embodiments, the end of the second mounting surface 111 near the tool holder 2 is configured as a supporting arc surface 1112 capable of supporting the cutting blade 3, and the end of the second mounting surface 111 away from the tool holder 2 is configured as a slope 1113, with the slope 1113 smoothly connected to the supporting arc surface 1112. When the end of the second mounting surface 111 near the tool holder 2 is configured as the supporting arc surface 1112, the structural strength of both the cutting blade 3 and the blade mounting groove 11 is improved. However, within a limited distance, relying solely on the supporting arc surface 1112 to support the cutting blade 3 is not as effective as adding the supporting plane 1111.

[0034] In some embodiments, the center of the cutter body 1 and the center of the cutter shank 2 are provided with a main flow channel 4 that is interconnected. Two flow channel holes 13 are spaced apart on the circumferential side of the cutter body 1 at positions opposite to the arc-shaped cutting edge 31 of the cutting insert 3, and the flow channel holes 13 are connected to the main flow channel 4. Existing ball end mills employ a single flow channel hole structure (such as a ball end mill and its machining method for machining universal joint ball cages disclosed in CN113857541A) or a structure with flow channel holes set on the upper and lower sides of the rake and flank faces (such as a CVJ ball end mill disclosed in CN223277235U). However, a single flow channel hole has a small coverage area and cannot achieve complete cooling. When flow channel holes are set on the upper and lower sides of the rake and flank faces, the airflow is more turbulent, which affects slag removal. In actual cutting conditions, flow channel holes are provided to prevent slag from appearing on the flank face, causing pressure on the workpiece, and thus leading to ball track scratches. In this embodiment, the two flow channel holes 13 are spaced apart and arranged on the circumferential side of the arc-shaped cutting edge 31 of the cutting blade 3 facing away from the cutting blade 1, which has a larger cooling range and will not generate turbulent airflow that affects slag discharge, resulting in better cooling and slag discharge effect.

[0035] In some embodiments, a positioning plane 14 is also provided on the circumferential side of the cutter body 1 near the tool holder 2. Existing ball end mills are not conducive to horizontal alignment during grinding. In this embodiment, due to the positioning plane 14, the positioning plane 14 can be aligned first, and then the cutting tool 3 can be aligned according to the angular relationship between the positioning plane 14 and the cutting tool 3, which is more conducive to grinding.

[0036] Based on the above embodiments, multiple positioning planes 14 are configured, and these multiple positioning planes 14 are symmetrically arranged on the cutter body 1. Specifically, in this embodiment, four positioning planes 14 are symmetrically arranged on the circumferential side of the cutter body 1. The maximum outer diameter of the existing ball end mill is a complete circle, which is not conducive to chip removal, and the tool is not easy to align horizontally during grinding. In this embodiment, by adding four sets of positioning planes 14 (the symmetrical arrangement of the four planes makes it easier to ensure the dynamic balance of the tool), on the one hand, the positioning surface (any plane among the four positioning planes 14) can be aligned first, and then the cutting tool 3 can be aligned according to the angular relationship between the positioning plane 14 and the cutting insert 3, which is more conducive to grinding. On the other hand, it also makes the maximum outer diameter of the ball end mill no longer a complete circle, which is more conducive to chip removal.

[0037] In some embodiments, a chip removal groove 15 is provided on the side of each insert mounting groove 11 on the circumferential side of the cutter body 1. The chip removal groove 15 has a chip removal groove guide wall 151. In the radial direction of the cutter body 1, the second mounting surface 111 is located outside the chip removal groove guide wall 151. The second mounting surface 111 of the insert mounting groove 11 is equivalent to a stepped surface provided on the chip removal groove guide wall 151, so that the first mounting surface 32 of the cutting insert 3 and the chip removal groove guide wall 151 have a certain distance, which facilitates the grinding of the rake face 34 of the cutting insert 3 and avoids sparks from the grinding head grinding the circumferential side of the cutter head 1 during grinding.

[0038] In some embodiments, the tool holder 2 includes a tapered positioning cylinder 21 and a mounting cylinder 22. The large end of the tapered positioning cylinder 21 is connected to the tool body 1, and the small end of the tapered positioning cylinder 21 is connected to the mounting cylinder 22. A positioning end face 16 is provided on one end of the tool body 1 facing the tapered positioning cylinder 21. The positioning end face 16 is an annular plane located outside the tapered positioning cylinder 21. A torque transmission plane 221 is machined on the outer circumferential surface of the mounting cylinder 22. The driving component, which is connected to the tool holder 2, can transmit torque by cooperating with the mounting cylinder 22. It can be centered by cooperating with the tapered positioning cylinder 21 to improve coaxiality. It can be over-positioned with the ball end mill in this embodiment by cooperating with the positioning end face 16 to increase the connection firmness.

[0039] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0040] The mechanism provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ball end mill that is easy to weld, comprising an integrally connected cutter body (1) and a cutter shank (2), wherein the cutter body (1) is hemispherical, and the end of the cutter body (1) facing away from the cutter shank (2) is an end face (12), and a plurality of insert mounting slots (11) are provided on the circumferential side of the cutter body (1), wherein cutting inserts (3) are installed in the insert mounting slots (11), characterized in that, The first mounting surface (32) of the cutting blade (3) is attached to the second mounting surface (111) of the blade mounting groove (11). The first mounting surface (32) is disposed opposite to the back face (33) of the cutting blade (3). The inclination of the end of the second mounting surface (111) near the tool holder (2) relative to the end plane (12) is less than the inclination of other positions on the second mounting surface (111) relative to the end plane (12), so that the second mounting surface (111) can support the cutting blade (3) in the axial direction of the tool body (1).

2. The ball end mill for easy welding according to claim 1, characterized in that, The second mounting surface (111) is provided with a support plane (1111) and a support arc surface (1112) on the end near the tool holder (2) to support the cutting blade (3), and a slope (1113) is provided on the end of the second mounting surface (111) away from the tool holder (2). The slope (1113) is smoothly connected to the support plane (1111) through the support arc surface (1112).

3. The ball end mill for easy welding according to claim 1, characterized in that, The second mounting surface (111) is provided with a support plane (1111) near the tool holder (2) to support the cutting blade (3), and the second mounting surface (111) away from the tool holder (2) is provided with an inclined surface (1113), which intersects and connects with the support plane (1111).

4. The ball end mill for easy welding according to claim 2 or 3, characterized in that, The supporting plane (1111) is arranged parallel to the end plane (12).

5. The ball end mill for easy welding according to claim 1, characterized in that, The second mounting surface (111) is provided with a support arc surface (1112) near the tool holder (2) to support the cutting blade (3), and the second mounting surface (111) is provided with a slope (1113) away from the tool holder (2), and the slope (1113) is smoothly connected to the support arc surface (1112).

6. The ball end mill for easy welding according to claim 1, characterized in that, The center of the cutter body (1) and the center of the handle (2) are provided with a main channel (4) that is interconnected. On the circumferential side of the cutter body (1), there are two flow channel holes (13) spaced apart at the position of the arc-shaped cutting edge facing away from the cutting blade (3). The flow channel holes (13) are connected to the main channel (4).

7. The ball end mill for easy welding according to claim 1, characterized in that, A positioning plane (14) is also provided on the circumferential side of the blade (1) near the handle (2).

8. The ball end mill for easy welding according to claim 7, characterized in that, The positioning plane (14) is configured as a plurality of planes, which are symmetrically arranged on the blade body (1).

9. The ball end mill for easy welding according to claim 1, characterized in that, On the circumferential side surface of the blade body (1), a chip removal groove (15) is provided on the side of each blade mounting groove (11). The chip removal groove (15) has a chip removal groove guide wall (151). In the radial direction of the blade body (1), the second mounting surface (111) is located outside the chip removal groove guide wall (151).

10. The ball end mill for easy welding according to claim 1, characterized in that, The tool holder (2) includes a conical positioning cylinder (21) and a mounting cylinder (22). The large end of the conical positioning cylinder (21) is connected to the tool body (1), and the small end of the conical positioning cylinder (21) is connected to the mounting cylinder (22). The tool body (1) has a positioning end face (16) on one end facing the conical positioning cylinder (21), and the outer peripheral surface of the mounting cylinder (22) is machined with a torque transmission plane (221).

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