Biarc core diameter milling cutter

Abstract

The utility model discloses a double-arc core diameter milling cutter and relates to the technical field of milling machining, the double-arc core diameter milling cutter comprises a handle part and a cutting part, one end of the cutting part is connected with the handle part, the diameter of the cutting part is D, the cutting part comprises a plurality of cutting edges, chip grooves are formed in every two adjacent cutting edges, the core diameter of each chip groove is 0.5 * D, and the diameter of each chip groove is D; the groove bottom of the chip groove comprises a first arc surface and a second arc surface, one end of the first arc surface is connected with one end of the second arc surface and is far away from the handle part, and the core radius of the first arc surface is larger than that of the second arc surface. According to the invention, cutter breakage caused by chip blockage due to overlarge cutting allowance can be reduced, and the cutting strength and rigidity of the cutter are improved.

Description

Technical Field

[0001] The present application relates to the technical field of milling processing, and in particular to a double arc core diameter milling cutter. Background Art

[0002] With the continuous advancement of science and technology, the 3C industry's requirements for materials are also increasing. Titanium alloy, with its high strength, light weight and corrosion resistance, is gradually becoming a star material in this field. However, titanium alloy is extremely difficult to process, which poses a severe challenge to the quality and life of the tool. In the rough processing of titanium alloy round nose knives, the problem of tool loss is particularly prominent. Edge chipping, tool burning, and tool breakage often occur at the R corner, which not only affects the processing efficiency, but also increases production costs.

[0003] In order to meet the requirements of good chip removal and rigidity in the rough machining of titanium alloys, the traditional design mostly adopts a double-slot structure (smaller core diameter at the front end and larger core diameter at the rear end) and a traditional rake face structure at the R angle. Although this structural design is simple, the double-slot structure makes the production tool processing time longer, which is not conducive to the company's cost savings; the traditional rake face structure is prone to chip sticking and excessive heat during the processing process, which makes the R angle easy to collapse and even break the tool. This not only affects the service life of the tool, but also increases the customer's production cost, which is not conducive to meeting the cost reduction needs. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a double arc core diameter milling cutter, which can reduce chip blockage and tool breakage caused by excessive cutting allowance, and improve the cutting strength and rigidity of the tool.

[0005] The present application provides a double-arc core diameter milling cutter, comprising: a shank and a cutting part, one end of the cutting part is connected to the shank, the diameter of the cutting part is D, the cutting part comprises a plurality of cutting edges, two adjacent cutting edges are provided with a chip groove, the core diameter of the chip groove is 0.5*D, the groove bottom of the chip groove comprises a first arc surface and a second arc surface, one end of the first arc surface is connected to one end of the second arc surface and is arranged away from the shank, and the core radius of the first arc surface is greater than the core radius of the second arc surface.

[0006] The double arc core diameter milling cutter according to the embodiment of the present application has at least the following beneficial effects: one end of the cutting portion is connected to the shank portion, and a chip groove is provided at two adjacent cutting edges in the cutting portion. The chip groove with a core diameter of 0.5*D can provide a super large tool groove chip removal space, and has very good chip removal performance. It can still have good chip removal performance under large cutting depth and large feed, and can achieve higher feed and material removal during rough machining, reduce the accumulation and blockage of chips inside the tool, thereby improving the stability and efficiency of the machining process, and effectively avoiding cutting allowance The problem of chip blockage and tool breakage due to excessive cutting allowance is solved, and the bottom of the chip groove includes a first arc surface and a second arc surface, wherein the core radius of the first arc surface is larger than the core radius of the second arc surface, so that the core diameter can have a very small core diameter (providing a larger chip holding space) at the front end of the chip groove, while the core diameter still has good strength and rigidity. At the same time, the double arc core diameter formed by the first arc surface and the second arc surface can provide a smoother curling for the chips, which is more conducive to chip breaking and chip removal, and reduces the sudden change and concentration of the cutting force. The second arc surface with a smaller core radius at the rear end can increase the core diameter strength and rigidity. That is, the present application provides a double arc core diameter milling cutter that can reduce the chip blockage and tool breakage due to excessive cutting allowance, optimize chip removal performance, and increase the cutting strength and rigidity of the tool.

[0007] According to some embodiments of the present application, the core radius of the first arc surface is 50 mm, and the core radius of the second arc surface is 40 mm.

[0008] According to some embodiments of the present application, the cutting edge includes an end edge and a peripheral edge arranged in a one-to-one correspondence, the peripheral edge is spirally arranged along the axial line of the shank, one end of the peripheral edge is connected to the end edge, and the other end of the peripheral edge is connected to the shank, the front angle of the peripheral edge is 3° to 5°, and the helix angle of each peripheral edge is 38°.

[0009] According to some embodiments of the present application, the arc back angle of the peripheral cutting edge is 10°.

[0010] According to some embodiments of the present application, four cutting edges are provided, and through grooves are provided at the end edges of two opposite cutting edges so that the chip grooves on both sides of the corresponding end edges are connected, and the two connected chip grooves are S-shaped in the end face direction.

[0011] According to some embodiments of the present application, the front cutting edge of the end blade is provided with a first rake angle and a second rake angle, the first rake angle is located on the front side of the second rake angle, the first rake angle is 16.5° to 19.5°, the width of the first rake angle is 0.2 mm, the second rake angle is 32.5° to 35.5°, and the width of the second rake angle is 1.1 mm.

[0012] According to some embodiments of the present application, a transition structure is further provided between the end edge and the peripheral edge, and the transition structure includes a first arc transition surface, a straight edge transition surface, and a second arc transition surface connected in sequence, the first arc transition surface is connected to the end edge, and the second arc transition surface is connected to the peripheral edge.

[0013] According to some embodiments of the present application, the core radius of the first arc transition surface is 0.98 mm, the core radius of the second arc transition surface is 30 mm, and the two endpoints of the straight-edge transition surface span 5° to 10°.

[0014] According to some embodiments of the present application, the back cutting surface of the end edge is provided with a first back angle and a second back angle, the first back angle is 7° to 9°, and the second back angle is 18° to 22°.

[0015] According to some embodiments of the present application, the length of the chip groove is 1.5 times the length of the cutting edge chip groove.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 A schematic diagram of the structure of a double arc core diameter milling cutter provided in some embodiments of the present application;

[0019] Figure 2 A cross-sectional view of a double arc core diameter milling cutter provided in some embodiments of the present application;

[0020] Figure 3 A front view of a double arc core diameter milling cutter provided in some embodiments of the present application;

[0021] Figure 4 A cross-sectional view of a double arc core diameter of a double arc core diameter milling cutter provided in some embodiments of the present application;

[0022] Figure 5 A schematic diagram of a transition structure provided in some embodiments of the present application;

[0023] Figure 6 A radial cross-sectional view of a peripheral blade provided in some embodiments of the present application;

[0024] Figure 7 A radial cross-sectional view of an end blade provided for some embodiments of the present application;

[0025] Figure 8A schematic end view of a double arc core diameter milling cutter provided in some embodiments of the present application.

[0026] The figures are as follows:

[0027] Shank 100 ; cutting portion 200 ; cutting edge 210 ; end edge 211 ; peripheral edge 212 ; chip groove 220 ; first arc surface 221 ; second arc surface 222 ; through groove 230 ; first arc transition surface 241 ; straight edge transition surface 242 ; second arc transition surface 243 . DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and 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 cannot be understood as limiting the present application.

[0029] In the description of the present application, it should be understood that descriptions involving orientation, 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, and are only for the convenience of describing the present 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, and therefore should not be understood as a limitation on the present application.

[0030] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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.

[0032] With the continuous advancement of science and technology, the requirements of the 3C industry for materials are also increasing. Titanium alloy, with its high strength, light weight and corrosion resistance, is gradually becoming a star material in this field. However, titanium alloy is extremely difficult to process, which poses a severe challenge to the quality and life of the tool. In the rough processing of titanium alloy round nose knives, the problem of tool loss is particularly prominent. Blade collapse, tool burning, and tool breakage often occur at the R angle, which not only affects the processing efficiency, but also increases the production cost. In order to meet the requirements of good chip removal and rigidity in the rough processing of titanium alloys, the traditional design mostly adopts a double-slot structure (smaller core diameter at the front end and larger core diameter at the rear end) and a traditional front face structure at the R angle. Although this structural design is simple, the double-slot structure makes the processing time of the production tool longer, which is not conducive to the cost saving of the enterprise; the traditional front face structure is prone to problems such as chip sticking and excessive heat generation during the processing process, which leads to easy chipping at the R angle and even tool breakage. This not only affects the service life of the tool, but also increases the production cost of customers, which is not conducive to meeting the cost reduction needs.

[0033] Based on this, the present application provides a double arc core diameter milling cutter to solve the above-mentioned technical problems. The technical solutions proposed in the present application are described in detail one by one below.

[0034] Reference Figure 1 , Figure 2 and Figure 4The present application provides a double arc core diameter milling cutter, comprising: a shank 100 and a cutting portion 200, one end of the cutting portion 200 is connected to the shank 100, the diameter of the cutting portion 200 is D, the cutting portion 200 comprises a plurality of cutting edges 210, and a chip groove 220 is provided at two adjacent cutting edges 210, the core diameter of the chip groove 220 is 0.5*D, the groove bottom of the chip groove 220 comprises a first arc surface 221 and a second arc surface 222, one end of the first arc surface 221 is connected to one end of the second arc surface 222, and is arranged away from the shank 100, and the core radius of the first arc surface 221 is greater than the core radius of the second arc surface 222. One end of the cutting part 200 is connected to the shank 100, and a chip groove 220 is provided at two adjacent cutting edges 210 in the cutting part 200. The chip groove 220 with a core diameter of 0.5*D can provide a large chip removal space, and has very good chip removal performance. It can still have good chip removal performance under large cutting depth and large feed, and can achieve higher feed and material removal in the rough machining process, reduce the accumulation and blockage of chips inside the tool, thereby improving the stability and efficiency of the machining process, and effectively avoid the problem of chip blockage and tool breakage due to excessive cutting allowance, and the chip groove 220 is easy to operate. The groove bottom of 0 includes a first arc surface 221 and a second arc surface 222, wherein the core radius of the first arc surface 221 is larger than the core radius of the second arc surface 222, so that the core diameter can still have good strength and rigidity while having a very small core diameter (providing a larger chip holding space) at the front end of the chip groove 220. At the same time, the double arc core diameter formed by the first arc surface 221 and the second arc surface 222 can provide a smoother curling for the chips, which is more conducive to chip breaking and chip removal, reducing the sudden change and concentration of the cutting force, and the second arc surface 222 with a smaller core radius at the rear end can increase the core diameter strength and rigidity. That is, the present application provides a double arc core diameter milling cutter that can reduce the chip blockage and tool breakage caused by excessive cutting allowance, optimize chip removal performance, and increase the tool cutting strength and rigidity.

[0035] It is understandable that the core radius of the first arc surface 221 is 50 mm, and the core radius of the second arc surface 222 is 40 mm. The double arc core diameter (R50 first arc surface 221 + R40 second arc surface 222) can have a very small core diameter at the front end while the core diameter still has good strength and rigidity. At the same time, the double arc core diameter (R50 first arc surface 221 + R40 second arc surface 222) can provide a smoother curling for the chips, which is more conducive to chip breaking and chip removal. The R40 arc core diameter curve is used at the rear end to increase the cutting strength and rigidity of the tool.

[0036] Reference Figure 2 and Figure 6It can be understood that the cutting edge 210 includes an end edge 211 and a peripheral edge 212 which are arranged in a one-to-one correspondence. The peripheral edge 212 is arranged spirally along the axis of the shank 100. One end of the peripheral edge 212 is connected to the end edge 211, and the other end of the peripheral edge 212 is connected to the shank 100. The front angle α1 of the peripheral edge 212 is 3° to 5°, and the helix angle θ of each peripheral edge 212 is 38°. The front angle α1 of the peripheral edge 212 between 3° and 5° can reduce the cutting force, reduce the cutting heat, improve the cutting efficiency, and also extend the service life of the tool. In an embodiment of the present application, the rake angle of the peripheral edge 212 is 4°. The peripheral edge 212 of the cutting edge 210 has good edge collapse resistance and wear resistance through the combination of a rake angle of 4° + a helix angle of 38°. At the same time, the helix angle is the angle between the projection of the cutting edge 210 in the axial direction and the projection of the cutting edge 210 on the cutting plane. The 38° helix angle also has good chip removal performance, which is conducive to the smooth discharge of chips and avoids chip blockage and accumulation.

[0037] Continue to refer to Figure 2 and Figure 6 It can be understood that the arc back angle α2 of the peripheral blade 212 is 10°. The arc back angle can provide better strength and rigidity of the cutting edge, make the cutting edge 210 transition more smoothly during the cutting process, reduce the scratches and extrusion of the cutting edge 210 on the machined surface, and make the cutting edge have better impact resistance, which helps to reduce the risk of damage and breakage of the cutting edge 210 during the cutting process and extend the service life of the tool.

[0038] Reference Figure 8 It can be understood that there are four cutting edges 210, wherein the end edges 211 of two opposite cutting edges 210 are provided with through grooves 230, so that the chip grooves 220 on both sides of the corresponding end edges 211 are connected, and the two connected chip grooves 220 are S-shaped in the end surface direction. The S-shaped through-type chip groove can provide better chip space and chip curling than the traditional chip groove, so that the chips can be discharged from the through-port to each other, which helps to prevent chip blockage and improve chip removal performance. At the same time, the smooth discharge of chips and the dispersion of cutting force reduce the risk of wear and damage of the cutting edge 210, thereby extending the service life of the tool.

[0039] Reference Figure 3It can be understood that the front face of the end edge 211 is provided with a first front angle β1 and a second front angle β2, the first front angle β1 is located in front of the second front angle β2, the first front angle β1 is 16.5° to 19.5°, the width d1 of the first front angle is 0.2mm, the second front angle β2 is 32.5° to 35.5°, and the width d2 of the second front angle is 1.1mm. In the embodiment of the present application, the first front angle is 18°, the second front angle is 34°, and the double front face and double front angle (18°+34°) structure has the advantage of always ensuring that the cutting front angle at the front face is a positive front angle, so that the cutting always has good sharpness, and effectively avoids easy chip sticking at the front face.

[0040] Reference Figure 5 It is understandable that a transition structure is also provided between the end edge 211 and the peripheral edge 212, and the transition structure includes a first arc transition surface 241, a straight edge transition surface 242, and a second arc transition surface 243 connected in sequence, wherein the first arc transition surface 241 is connected to the end edge 211, and the second arc transition surface 243 is connected to the peripheral edge 212. A straight edge transition surface 242 is used for connection at the end of the first arc transition surface 241, which can improve the sharpness of the entire R angle cutting, make cutting easier, improve cutting efficiency, effectively reduce the generation of cutting heat, and avoid the problem that the traditional R angle is easy to fail here. At the same time, the smooth connection of the arc transition surface can reduce the sudden change of the cutting edge 210 during the processing process and improve the quality of the processed surface.

[0041] It is understandable that the core radius of the first arc transition surface 241 is 0.98mm, the core radius of the second arc transition surface 243 is 30mm, and the inclination angle of the straight edge transition surface 242 relative to the axis of the cutting part 200 is 5° to 10°. The first arc transition surface 241 of R0.98 can make the end edge 211 and the peripheral edge 212 smoothly connected, which can reduce the sudden change of the cutting edge 210 during the processing and improve the quality of the processed surface. At the end of the first arc transition surface 241, a 5° to 10° straight edge transition surface 242 is used for connection. Under the premise of ensuring that the overall R angle accuracy is not affected, it has an unparalleled cutting sharpness of the entire R angle, making cutting easier, effectively reducing the generation of cutting heat, and avoiding the problem that the traditional R angle is easy to fail here. The rear end adopts the second arc transition surface 243 of R30. This large arc transition solves the problem of excessive stress concentration at the transition from the small straight edge to the peripheral edge 212, which leads to collapse.

[0042] Reference Figure 7It can be understood that the back face of the end edge 211 is provided with a first back angle γ1 and a second back angle γ2, the first back angle γ1 is 7° to 9°, and the second back angle γ2 is 18° to 22°. By reasonably setting the angle of the back face, the extrusion and scratching of the processing surface by the cutting edge 210 can be reduced. The smaller first back angle helps to maintain the sharpness of the cutting edge 210 and improve the cutting efficiency. The small angle of the first back angle helps to maintain the stability of the cutting edge 210 and reduce the vibration during the cutting process. The larger second back angle can further reduce friction, reduce the wear of the tool, and extend the service life of the tool.

[0043] Reference Figure 3 , the length L1 of the chip groove 220 is 1.5 times the length L2 of the chip groove 220 of the cutting edge 210. The non-traditional groove length structure of 1.5 times the length of the blade is adopted to increase the length of the chip groove 220, especially to set it to 1.5 times the length of the chip groove 220 of the cutting edge 210, which can more effectively accommodate and discharge the chips generated during the cutting process. This helps to reduce the accumulation and blockage of chips inside the tool, thereby improving the chip removal efficiency and allowing the tool to better play the superiority of the short blade effect.

[0044] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A double arc core diameter milling cutter, characterized in that: include: handle; A cutting part, one end of which is connected to the shank, the diameter of which is D, the cutting part comprising a plurality of cutting edges, a chip groove being provided at two adjacent cutting edges, the core diameter of the chip groove being 0.5*D, the bottom of the chip groove comprising a first arc surface and a second arc surface, one end of the first arc surface being connected to one end of the second arc surface and being arranged away from the shank, the core radius of the first arc surface being greater than the core radius of the second arc surface.

2. The double arc core diameter milling cutter according to claim 1, characterized in that: The core radius of the first arc surface is 50 mm, and the core radius of the second arc surface is 40 mm.

3. The double arc core diameter milling cutter according to claim 1, characterized in that: The cutting edge includes an end edge and a peripheral edge arranged in a one-to-one correspondence. The peripheral edge is spirally arranged along the axis of the shank. One end of the peripheral edge is connected to the end edge, and the other end of the peripheral edge is connected to the shank. The front angle of the peripheral edge is 3° to 5°, and the helix angle of each peripheral edge is 38°.

4. The double arc core diameter milling cutter according to claim 3, characterized in that: The arc back angle of the peripheral cutting edge is 10°.

5. The double arc core diameter milling cutter according to claim 3, characterized in that: There are four cutting edges, and through grooves are provided at the end edges of two opposite cutting edges so that the chip removal grooves on both sides of the corresponding end edges are connected, and the two connected chip removal grooves are S-shaped in the end face direction.

6. The double arc core diameter milling cutter according to claim 3, characterized in that: The front cutting edge of the end blade is provided with a first rake angle and a second rake angle, the first rake angle is located in front of the second rake angle, the first rake angle is 16.5° to 19.5°, the width of the first rake angle is 0.2mm, the second rake angle is 32.5° to 35.5°, and the width of the second rake angle is 1.1mm.

7. The double arc core diameter milling cutter according to claim 3, characterized in that: A transition structure is also provided between the end edge and the peripheral edge, and the transition structure comprises a first arc transition surface, a straight edge transition surface and a second arc transition surface connected in sequence, the first arc transition surface is connected to the end edge, and the second arc transition surface is connected to the peripheral edge.

8. The double arc core diameter milling cutter according to claim 7, characterized in that: The core radius of the first arc transition surface is 0.98 mm, the core radius of the second arc transition surface is 30 mm, and the inclination angle of the straight edge transition surface relative to the axis of the cutting portion is 5° to 10°.

9. The double arc core diameter milling cutter according to claim 3, characterized in that: The back surface of the end edge is provided with a first back angle and a second back angle, wherein the first back angle is 7° to 9°, and the second back angle is 18° to 22°.

10. The double arc core diameter milling cutter according to claim 1, characterized in that: The length of the chip groove is 1.5 times the length of the cutting edge chip groove.

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