A milling cutter for machining thin-walled products

Abstract

The utility model discloses a milling cutter for processing thin -walled product, include: tool bar, including opposite first end and second end, the tool bar is provided with welding groove, the welding groove is set up in first end and is inclined along the axial direction of tool bar, tool part is welded in welding groove, the surface of tool part is in accord with the groove wall of welding groove, tool part includes rake face and relief, the tool tip of the side of rake face away from welding groove is provided with inverted edge, and the inverted edge is triangular. The utility model has solved the problem of the deformation of product and the scrapping of product caused by the existing milling cutter to the thin -walled product.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and in particular to a milling cutter for machining thin-walled products. Background Technology

[0002] In the precision manufacturing of consumer electronics, the trend towards thinner and lighter designs places higher demands on the processing technology of thin-walled structural components such as aluminum alloy casings. Traditional milling processes typically use back face grinding tools (forming a standard cutting edge through the first and second clearance angles) to process logos. However, when machining thin aluminum casings, the cutting force of tools produced by traditional milling processes is relatively concentrated, which can easily cause convex or concave deformation around the logo placement area, leading to product deformation and scrap. Utility Model Content

[0003] The main purpose of this utility model is to provide a milling cutter for machining thin-walled products, aiming to solve the problem that existing milling cutters easily cause product deformation and scrap when machining thin-walled products.

[0004] To achieve the above objectives, this utility model proposes a milling cutter for machining thin-walled products, comprising:

[0005] A tool holder includes a first end and a second end opposite to each other. The tool holder is provided with a welding groove, which is opened at the first end and inclined along the axial direction of the tool holder.

[0006] The cutting edge is welded to the welding groove, and the surface of the cutting edge is in contact with the groove wall of the welding groove. The cutting edge includes a front cutting face and a rear cutting face. The tip of the front cutting face away from the welding groove is provided with a chamfer, and the chamfer is triangular.

[0007] Optionally, the cutting edge protrudes from the welding groove, with an exposed height of 0.5-0.6 mm and an exposed width of 0.3 mm.

[0008] Optionally, the first end of the tool holder is provided with a clearance portion, which is located on the rear side of the tool, and the included angle between the clearance portion and the tool holder is 25°.

[0009] Optionally, the first end of the tool holder is further provided with a first chip removal surface and a second chip removal surface that are connected, wherein the angle between the first chip removal surface and the tool holder is 40°, and the angle between the second chip removal surface and the tool holder is 30°.

[0010] Optionally, an axial first clearance angle and an axial second clearance angle are provided between the back face and the transverse horizontal line, the angle between the axial first clearance angle and the transverse horizontal line is 9°, and the angle between the axial second clearance angle and the transverse horizontal line is 22°.

[0011] Optionally, a first radial clearance angle and a second radial clearance angle are provided between the back face and the vertical horizontal line, the first radial clearance angle and the vertical horizontal line having an angle of 15°, and the second radial clearance angle and the vertical horizontal line having an angle of 25°.

[0012] Optionally, the angle between the chamfer and the rake face is 26°.

[0013] Optionally, the surface roughness Ra of the chamfer is ≤0.02μm.

[0014] Optionally, the rake face is parallel to the plane of the center of the tool holder, and the distance between the rake face and the center of the tool holder is ±0.03mm.

[0015] Optionally, the material of the blade is a composite material of PCD layer and alloy layer.

[0016] The beneficial effects of this utility model are: reducing the problem of product scrap due to processing deformation, and improving production yield and efficiency. This application includes a tool holder and a tool part. The first end of the tool holder is provided with a welding groove, and the tool part is welded into the welding groove. The tip of the cutting edge of the tool part is provided with a triangular chamfer. The structure of the triangular chamfer changes the stress state of the cutting edge, disperses and reduces the cutting pressure acting on the workpiece surface, thereby avoiding the upward or downward deformation caused by stress concentration around the LOGO placement position. Attached Figure Description

[0017] 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 the structures shown in these drawings without creative effort.

[0018] Figure 1 This is an overall structural diagram of the milling cutter used for machining thin-walled products in this utility model;

[0019] Figure 2 This is a front view of the milling cutter used for machining thin-walled products in this utility model;

[0020] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0021] Figure 4 for Figure 2 A magnified view of a section at point A in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of the blade part in this utility model;

[0023] Label Explanation:

[0024] 1. Tool holder; 11. First end; 12. Second end; 13. Transition section;

[0025] 2. Blade section; 21. Front cutting face; 22. Back cutting face; 23. First cutting edge; 24. Second cutting edge; 25. Third cutting edge; 26. Fourth cutting edge; 27. Fifth cutting edge;

[0026] 3. Welding groove;

[0027] 4. Safe area;

[0028] 5. First chip removal surface;

[0029] 6. Second chip removal surface;

[0030] 7. Beveling;

[0031] 81. First rear angle in the axial direction; 82. Second rear angle in the axial direction;

[0032] 91. First radial rear angle; 92. Second radial rear angle;

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] 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.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] One embodiment of this utility model provides a milling cutter for machining thin-walled products, see reference. Figures 1 to 5 ,include:

[0038] The tool holder 1 includes a first end 11 and a second end 12, which are opposite each other. The tool holder 1 is provided with a welding groove 3, which is opened at the first end 11 and inclined along the axial direction of the tool holder 1.

[0039] The cutting part 2 is welded to the welding groove 3. The surface of the cutting part 2 is in contact with the groove wall of the welding groove 3. The cutting part 2 includes a front cutting face 21 and a rear cutting face 22. The tip of the front cutting face 21 away from the welding groove 3 is provided with a chamfer 7, which is triangular.

[0040] This application reduces the problem of product scrap due to processing deformation, and improves production yield and efficiency. This application includes a tool holder 1 and a tool part 2. The first end 11 of the tool holder 1 is provided with a welding groove 3, and the tool part 2 is welded into the welding groove 3. The tip of the rake face 21 of the tool part 2 is provided with a triangular chamfer 7. The structure of the triangular chamfer 7 changes the stress state of the cutting edge, disperses and reduces the cutting pressure acting on the workpiece surface, thereby avoiding upward or downward deformation caused by stress concentration around the LOGO placement area.

[0041] Specifically, the first end 11 and the second end 12 of the tool holder 1 are used to mount the tool part 2 and connect to an external cutting drive device, respectively. The diameter of the first end 11 is smaller than that of the second end 12. The diameter of the first end 11 is 3.5 ± 0.05 mm, and its length is 8 ± 0.1 mm. A transition section 13 is provided between the first end 11 and the second end 12, forming an arc-shaped transition connection. The outer diameter of the transition section 13 gradually increases from the first end 11 to the second end 12, forming a tapered structure, which improves the structural strength of the tool holder 1. Furthermore, this structure, with its decreasing diameter from the first end 11 to the second end 12, prevents accidental collisions or interference between the second end 12 of the tool holder 1 and external fixtures during machining, thus improving the applicability of the tool part 2.

[0042] Furthermore, the welding groove 3 extends obliquely along the axial direction of the tool holder 1. The welding groove 3 is formed at the first end 11 and extends to the side circumferential surface of the tool holder 1. The extension portion of the welding groove 3 on the side circumferential surface of the tool holder 1 is notched to facilitate the installation of the tool part 2. Specifically, the cross-section of the welding groove 3 is arc-shaped, and the oblique sidewall of the welding groove 3 extends in an arc shape. The arc-shaped oblique sidewall ensures that the tool holder 1 will not break at the connection between the oblique sidewall and the bottom wall, further improving the strength of the tool holder 1. The design of the arc-shaped welding groove 3 can reduce stress concentration and prevent the tool holder 1 from breaking due to stress concentration during the welding and cutting processes. Specifically, the arc-shaped sidewall can evenly distribute the stress during cutting, avoiding cracking of the welded part or the tool holder 1 due to stress concentration. Furthermore, the cutting tool 2 is made of a composite material of PCD layer and alloy layer. The PCD layer has high hardness and wear resistance, which reduces the wear rate of the cutting tool 2 when machining thin-walled products, extending the tool's service life. Simultaneously, the PCD layer also reduces the surface roughness of the machined surface. The alloy layer provides excellent support for the PCD layer, enhancing the overall strength and impact resistance of the cutting tool 2 and preventing the PCD layer from cracking during cutting. The combination of these two elements allows the end mill to ensure both high-efficiency cutting and maintain stable machining accuracy over a long period when machining thin-walled products, significantly improving production efficiency and machining quality.

[0043] Furthermore, the cutting edge 2 protrudes from the welding groove 3, with an exposed height of 0.5-0.6 mm and an exposed width of 0.3 mm. In this embodiment, the cutting edge 2 is welded into the welding groove 3, with the top end of the cutting edge 2 protruding 0.5-0.6 mm from the welding groove 3 and the side end of the cutting edge 2 protruding 0.3 mm from the welding groove 3. This ensures that the cutting edge 2 is welded as close as possible to the groove wall of the welding groove 3 without affecting the cutting edge, thereby improving the welding strength and ensuring the stability of the tool during cutting. When the exposed height of the top end of the cutting edge 2 exceeds 0.6 mm, the cutting edge of the cutting edge extends too far, resulting in reduced strength and increased susceptibility to vibration. When the exposed height of the top end of the cutting edge 2 is less than 0.5 mm, the cutting edge extends too little, affecting the cutting process. Specifically, the height design between the tool part 2 and the tool holder 1 is reasonable, which ensures the stability of the tool during cutting and avoids uneven distribution of cutting force or tool vibration caused by excessive height deviation.

[0044] Specifically, the height of the welding groove 3 along the axis of the tool holder 1 is 5.32±0.1mm, and the welding surface of the welding groove 3 extends beyond the center of the tool holder 1 by 0.3±0.05mm in the radial plane. That is, the length of the welding groove 3 exceeds the center of the tool holder 1 by 0.3±0.05mm, and the width of the welding groove 3 exceeds the center of the tool holder 1 by 0.6±0.01mm. Through the size design of the welding groove 3, the tool part 2 can be stably installed in the welding groove 3. Furthermore, the cutting tool 2 includes a first cutting edge 23, a second cutting edge 24, a third cutting edge 25, a fourth cutting edge 26, and a fifth cutting edge 27 connected in sequence. In this embodiment, the first cutting edge 23 and the third cutting edge 25 extend laterally, the second cutting edge 24 and the fifth cutting edge 27 extend vertically, and the fourth cutting edge 26 is fitted to the inner wall of the welding groove 3 after oblique shearing. Through the design of multiple cutting edges, the versatility and cutting efficiency of the cutting tool 2 are improved. Moreover, the first cutting edge 23, the second cutting edge 24, the third cutting edge 25, and the fifth cutting edge 27 are partially or completely exposed in the welding groove 3 so that the cutting edges are not obstructed during cutting. The length of the first cutting edge 23 is 2.75±0.05mm, the length of the second cutting edge 24 is 3.5±0.05mm, the length of the third cutting edge 25 is 1.65±0.02mm, the length of the fourth cutting edge 26 is R63±0.5mm, and the length of the fifth cutting edge 27 is 0.5±0.02mm. The dimensions of the welding groove 3 and the cutting tool 2 are designed so that the cutting tool 2 can fit as closely as possible to the wall of the welding groove 3 when it is welded into the welding groove 3. This enhances the connection strength between the cutting tool 2 and the tool holder 1, avoids the risk of the cutting tool 2 falling off during high-speed cutting, and improves the safety and stability of the milling cutter.

[0045] Furthermore, the first end 11 of the tool holder 1 is provided with a clearance portion 4, which is located on the rear side of the cutting part 2, and the included angle between the clearance portion 4 and the tool holder 1 is 25°. In this embodiment, the clearance portion 4 is located at the first end 11 of the tool holder 1 and on the rear side of the cutting part 2, which is used to prevent the tool holder 1 from being accidentally ground during the subsequent grinding of the cutting edge of the cutting part 2, thereby preventing the tool holder 1 from being over-ground and affecting its strength, improving the cutting performance and machining accuracy of the milling cutter, and extending the service life of the milling cutter.

[0046] Furthermore, the first end 11 of the tool holder 1 is also provided with a first chip removal surface 5 and a second chip removal surface 6 that are connected. The angle between the first chip removal surface 5 and the tool holder 1 is 40°, and the angle between the second chip removal surface 6 and the tool holder 1 is 30°. In this embodiment, during the cutting process, under the action of centrifugal force and cutting force generated by high-speed rotation, the chips can be discharged outward along the first chip removal surface 5, avoiding the accumulation of chips between the tool holder 1 and the workpiece, reducing secondary scraping of the processed product surface by the chips, and improving the surface quality of the processed product. The second chip removal surface 6 works in conjunction with the first chip removal surface 5 to further guide the chips out, while providing a wider channel for the flow of cutting fluid. The cutting fluid can fully cover the cutting area along the chip removal surface, carrying away a large amount of cutting heat. Compared with the traditional tool holder 1 structure, it can reduce the temperature of the cutting area, effectively preventing the deformation of thin-walled products due to heat, and also slowing down the wear rate of the tool.

[0047] Furthermore, an axial first clearance angle 81 and an axial second clearance angle 82 are provided between the flank face 22 and the transverse horizontal line. The angle between the axial first clearance angle 81 and the transverse horizontal line is 9°, and the angle between the axial second clearance angle 82 and the transverse horizontal line is 22°. In this embodiment, the 9° angle between the axial first clearance angle 81 and the transverse horizontal line, and the width of the axial first clearance angle 81 being 0.1-0.2mm, effectively reduce friction between the flank face 22 and the machined surface, reduce the generation of cutting heat, and prevent thin-walled workpieces from deforming due to heat. The 22° angle between the axial second clearance angle 82 and the transverse horizontal line enhances the strength and durability of the cutting edge, ensuring cutting sharpness while enabling the cutting edge to withstand greater cutting forces and extending tool life. The optimal width of the axial first clearance angle 81 is 0.16mm.

[0048] Furthermore, a first radial clearance angle 91 and a second radial clearance angle 92 are provided between the flank face 22 and the vertical horizontal line. The angle between the first radial clearance angle 91 and the vertical horizontal line is 15°, and the angle between the second radial clearance angle 92 and the vertical horizontal line is 25°. In this embodiment, the angle between the first radial clearance angle 91 and the vertical horizontal line is 15°, and the width of the first radial clearance angle 91 is 0.1-0.2mm, which helps to optimize the curling and discharge direction of the chips, allowing the chips to be smoothly discharged from the machining area and reducing the impact of chip blockage on the surface quality of the machined product. The angle between the second radial clearance angle 92 and the vertical horizontal line is 25°, which improves the stress state of the tool during the cutting process, reduces the possibility of tool vibration, and ensures the dimensional accuracy and surface finish of thin-walled products.

[0049] Furthermore, the angle between the chamfer 7 and the rake face 21 is 26°. In this embodiment, the angle between the chamfer 7 and the rake face 21 is 26°, which allows the milling cutter to better cut into thin-walled products during cutting, avoiding workpiece tearing or deformation due to improper cutting angle. The chamfer 7 has a length of 0.3±0.03mm and a width of 0.08±0.02mm. This size of chamfer 7 better avoids stress concentration at the cutting tip, reducing the risk of deformation of thin-walled workpieces, while also making the cutting edge sharper and improving cutting efficiency.

[0050] Furthermore, the surface roughness Ra of the chamfer 7 is ≤0.02μm, which can improve the cutting performance and machining quality of the milling cutter. The extremely low surface roughness can reduce the friction between the chips and the surface of the chamfer 7, making the chips easier to remove and less likely to form built-up edge.

[0051] Furthermore, the rake face 21 is parallel to the plane of the center of the tool holder 1, and the distance between the rake face 21 and the center of the tool holder 1 is ±0.03mm. In this embodiment, the thickness of the tool part 2 is 0.6±0.01mm. Since the width of the welding groove 3 exceeds the center of the tool holder 1 by 0.6±0.01mm, when the tool part 2 is welded into the welding groove 3, the rake face 21 of the tool part 2 is parallel to or coincides with the plane of the center of the tool holder 1, and the distance between the rake face 21 and the plane of the center of the tool holder 1 is ±0.03mm. At this time, in the axial direction of the tool holder 1, the angle between the side edge of the tool part 2 and the axis of the tool holder 1 is 0°, so that the cutting force is uniformly transmitted along the axial direction of the tool holder 1, and no additional lateral extrusion is generated on the thin-walled product. This avoids the lateral component force generated by the inclination angle, thereby avoiding the workpiece deformation and twisting problems caused by lateral force in traditional processing.

[0052] This application also provides a method for manufacturing a milling cutter for machining thin-walled products, the method comprising:

[0053] S1. The tool holder 1 is machined to form a tool holder 1 having a first end 11 and a second end 12;

[0054] S2. Groove and grind the first end 11 of the tool holder 1 to remove chips;

[0055] S3. Machining the cutting part 2 to form the required shape and size;

[0056] S4. Weld the cutting part 2 to the cutting shank 1;

[0057] S5. Rough and fine grinding is performed on the blade part 2 to process the cutting edge and the angle of the blade part 2;

[0058] S6. Grind the tip of the blade 2 to create a chamfer 7.

[0059] Specifically, in S1, a step-cutting machine is used to process the tool holder 1 to form a tool holder 1 with a first end 11 and a second end 12. The diameter of the first end 11 is 3.5±0.05mm and the length is 8±0.1mm. A transition section 13 is set between the first end 11 and the second end 12. Through the progressive cutting function of the step-cutting machine, the outer diameter of the transition section 13 gradually increases from the first end 11 to the second end 12, forming a tapered structure.

[0060] In S2, a five-axis Daijie tool grinder is used to slot the first end 11 of the tool holder 1. A 126mm diameter grinding wheel is used to machine the first end 11, creating a welding groove 3, a clearance portion 4, a first chip removal surface 5, and a second chip removal surface 6. The dimensions of the welding groove 3 are as follows: the height of the welding groove 3 along the axis of the tool holder 1 is 5.32±0.1mm; the welding surface of the welding groove 3 extends radially beyond the center of the tool holder 1 by 0.3±0.05mm (i.e., the length of the welding groove 3 exceeds the center of the tool holder 1 by 0.3±0.05mm); the width of the welding groove 3 exceeds the center of the tool holder 1 by 0.6±0.01mm; the angle between the clearance portion 4 and the tool holder 1 is 25°; the angle between the first chip removal surface 5 and the tool holder 1 is 40°; and the angle between the second chip removal surface 6 and the tool holder 1 is 30°.

[0061] In S3, a laser cutting machine is used to cut a PCD disc with a diameter of 55mm, ensuring that the dimensions of the cutting tool 2 meet IT10 tolerance requirements. Specifically, the first cutting edge 23 has a length of 2.75±0.05mm, the second cutting edge 24 has a length of 3.5±0.05mm, the third cutting edge 25 has a length of 1.65±0.02mm, the fourth cutting edge 26 is an arc-shaped structure with a radius R63±0.5mm, and the fifth cutting edge 27 has a length of 0.5±0.02mm. The cut cutting tool 2 is then ground using a surface grinder to achieve a thickness of 0.6±0.01mm, thus ensuring that the distance between the rake face 21 of the cutting tool 2 and the center of the tool holder 1 is ±0.03mm.

[0062] In S4, a vacuum welding machine is used to weld the blade part 2 into the welding groove 3 of the blade shank 1, so that the surface of the blade part 2 is in close contact with the arc-shaped groove wall of the welding groove 3, and the fourth cutting edge 26 of the blade part 2 is in full contact with the inner wall of the welding groove 3. At the same time, the top of the blade part 2 protrudes from the welding groove 3, wherein the height of the top of the blade part 2 protruding from the welding point is 0.5-0.6mm, and the width of the side of the blade part 2 protruding from the welding groove 3 is 0.3mm.

[0063] In S5, a high-powered grinding machine is used to perform rough grinding and fine grinding on the welded tool part 2, so that the angle between the first axial rear angle 81 and the horizontal line is 9°, the angle between the second axial rear angle 82 and the horizontal line is 22°, the angle between the first radial rear angle 91 and the vertical line is 15°, and the angle between the second radial rear angle 92 and the vertical line is 25°.

[0064] In S6, a high-powered grinding machine is used to finely grind the tip of the cutting tool 2, producing a triangular chamfer 7. The chamfer 7 has an angle of 26° with the rake face 21, a length of 0.3±0.03mm, a width of 0.08±0.02mm, and a surface roughness Ra≤0.02μm.

[0065] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A milling cutter for machining thin-walled products, characterized in that, include: A tool holder includes a first end and a second end opposite to each other. The tool holder is provided with a welding groove, which is opened at the first end and inclined along the axial direction of the tool holder. The cutting edge is welded to the welding groove, and the surface of the cutting edge is in contact with the groove wall of the welding groove. The cutting edge includes a front cutting face and a rear cutting face. The tip of the front cutting face away from the welding groove is provided with a chamfer, and the chamfer is triangular.

2. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The blade protrudes from the welding groove, with an exposed height of 0.5-0.6 mm and an exposed width of 0.3 mm.

3. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The first end of the tool holder is provided with a clearance portion, which is located on the rear side of the tool, and the included angle between the clearance portion and the tool holder is 25°.

4. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The first end of the tool holder is also provided with a first chip removal surface and a second chip removal surface that are connected. The angle between the first chip removal surface and the tool holder is 40°, and the angle between the second chip removal surface and the tool holder is 30°.

5. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The back face is provided with an axial first back angle and an axial second back angle between it and the horizontal line. The angle between the axial first back angle and the horizontal line is 9°, and the angle between the axial second back angle and the horizontal line is 22°.

6. The milling cutter for machining thin-walled products according to claim 1, characterized in that, A first radial clearance angle and a second radial clearance angle are provided between the back face and the vertical horizontal line. The angle between the first radial clearance angle and the vertical horizontal line is 15°, and the angle between the second radial clearance angle and the vertical horizontal line is 25°.

7. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The angle between the chamfer and the rake face is 26°.

8. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The surface roughness Ra of the chamfer is ≤0.02μm.

9. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The rake face is parallel to the plane of the center of the tool holder, and the distance between the rake face and the center of the tool holder is ±0.03mm.

10. The milling cutter for machining thin-walled products according to claim 1, characterized in that, The blade is made of a composite material of PCD layer and alloy layer.

Images