High-strength profile milling cutter

Abstract

This utility model discloses a high-strength forming milling cutter, comprising: a cutter shank with a welding groove at its end, the sidewall of the welding groove being parallel to the axis of the cutter shank, and the bottom wall of the welding groove being perpendicular to the axis of the cutter shank; and a cutter head fixed to the welding groove, the cutter head having a cutting edge, and the cutter head having an L-shaped structure, the cutting edge fully extending out of the welding groove. This utility model solves the problems of easy breakage of the cutter shank of small-diameter cutters and easy cracking of the cutter head during welding and machining.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a high-strength forming milling cutter. Background Technology

[0002] With the continuous advancement of technology, the precision requirements for metal processing are also increasing. The processing of some precision equipment places high demands on the cutting tools to ensure higher quality control standards. For example, when performing high-gloss processing on mobile phone camera frames, due to the small spacing between the holes in the camera frame, the diameter of the cutting tool needs to be controlled to become smaller and smaller during the processing to meet processing and quality requirements.

[0003] To improve the strength of existing small-diameter machining tools, oblique or side slots are generally used to install the inserts into the slots. However, due to the small diameter of the tool holder, the strength of the tool holder base is weak after slotting, which can easily lead to tool breakage during use. Furthermore, stress release when the insert is welded to the tool holder can easily cause the insert to crack during subsequent laser processing, resulting in low tool production and usage yield. Utility Model Content

[0004] The main purpose of this utility model is to provide a high-strength forming milling cutter, which aims to solve the problems of easy breakage of the cutter shank of small-diameter cutters and easy cracking of the cutter part during welding and machining.

[0005] To achieve the above objectives, this utility model proposes a high-strength forming milling cutter, comprising:

[0006] A tool holder has a welding groove at its end, the sidewall of which is parallel to the axis of the tool holder and the bottom wall of which is perpendicular to the axis of the tool holder.

[0007] The blade is fixed to the welding groove, and the blade has a cutting edge and an L-shaped structure, with the cutting edge extending completely out of the welding groove.

[0008] Optionally, the tool holder includes a first section and a second section connected to each other, the welding groove is formed in the first section, and the diameter of the first section is smaller than the diameter of the second section.

[0009] Optionally, the welding groove is cut through the axis of the tool holder, and the distance from the side wall of the welding groove to the axis of the tool holder is 0.7-0.75mm.

[0010] Optionally, the end of the blade is provided with a clearance angle, which is the angle between the end face of the blade and the horizontal line, and the clearance angle is 20-25 degrees.

[0011] Optionally, the cutting part is provided with a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge, all extending out of the welding groove at the cutting edge position; the first cutting edge is located at the top of the cutting part and is perpendicular to the axis of the cutting rod, the second cutting edge is parallel to the axis of the cutting rod, the third cutting edge is rounded to connect the second cutting edge and the fourth cutting edge, and the fourth cutting edge is located at the bottom of the cutting edge.

[0012] Optionally, the first cutting edge extends out of the welding groove by a height of 3.5-3.7 mm, and the fourth cutting edge extends out of the welding groove by a height of 0.3-0.49 mm.

[0013] Optionally, the distance from the second cutting edge to the axis of the cutting rod is 0.85-1.1 mm, and the distance from the right side of the cutting part to the axis of the cutting rod is 0.6-0.85 mm.

[0014] Optionally, the blade width of each cutting edge on the blade is 0.08-0.13 mm.

[0015] Optionally, the back angle of each cutting edge on the blade is 2-4 degrees.

[0016] Optionally, the cutting edge is made of CVD diamond.

[0017] The beneficial effects of this utility model are as follows: it solves the problems of easy breakage of the tool shank and easy cracking of the tool part during welding and machining of small diameter tools; wherein the end of the tool shank is provided with a welding groove, the welding surface of the welding groove is flat, thereby reducing the stress change during the welding of the tool part, and the cutting edge of the tool part extends out of the welding groove, so that when the lower side of the tool part is welded to the tool shank, the cutting edge on the cutting edge will not be affected by the stress after welding. In addition, the cutting edge extending out of the welding groove allows the cutting edge to better release thermal stress through its own deformation during subsequent machining of the cutting edge, preventing the tool part from cracking due to the rigid support of the tool shank on the cutting edge. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the overall isometric structure of the high-strength forming milling cutter of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall isometric structure of the high-strength forming milling cutter of this utility model from another perspective.

[0021] Figure 3 This is a front view structural diagram of the high-strength forming milling cutter of this utility model;

[0022] Figure 4 This is a schematic diagram of the left-side structure of the high-strength forming milling cutter of this utility model;

[0023] Figure 5 for Figure 4 Enlarged structural diagram of region A in the middle;

[0024] Figure 6 This is a rear view schematic diagram of the high-strength forming milling cutter of this utility model;

[0025] Figure 7 This is a top view of the high-strength forming milling cutter of this utility model.

[0026] Label Explanation:

[0027] 1. Tool holder; 11. Welding groove; 12. First section; 13. Second section;

[0028] 2. Blade section; 21. Edge; 22. Clearance angle; 23. First cutting edge; 24. Second cutting edge; 25. Third cutting edge; 26. Fourth cutting edge; 27. Back angle.

[0029] 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

[0030] 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.

[0031] 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.

[0032] 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.

[0033] One embodiment of this utility model provides a high-strength forming milling cutter, referencing... Figures 1 to 7 ,include:

[0034] The tool holder 1 has a welding groove 11 at its end. The side wall of the welding groove 11 is parallel to the axis of the tool holder 1, and the bottom wall of the welding groove 11 is perpendicular to the axis of the tool holder 1.

[0035] The blade part 2 is fixed to the welding groove 11. The blade part 2 has a cutting edge 21 and is L-shaped. The cutting edge 21 extends completely out of the welding groove 11.

[0036] This embodiment solves the problems of tool breakage of the tool holder 1 and cracking of the tool part 2 during welding and machining of small-diameter tools. The tool holder 1 has a welding groove 11 at its end. The welding surface of the welding groove 11 is flat, thereby reducing the stress change of the tool part 2 during welding. The cutting edge 21 of the tool part 2 extends out of the welding groove 11, so that when the lower side of the tool part 2 is welded to the tool holder 1, the cutting edge on the cutting edge 21 will not be affected by the stress after welding. In addition, the cutting edge 21 extending out of the welding groove 11 allows the cutting edge of the tool part 2 to better release thermal stress through its own deformation during subsequent machining, preventing the tool part 2 from cracking due to the rigid support of the tool holder 1 on the cutting edge. Specifically, the welding groove 11 is formed by cutting with a grinding wheel. The welding groove 11 is in the shape of a semi-open notch. The side wall of the welding groove 11 is perpendicular to the bottom wall. The side wall of the welding groove 11 extends vertically and is parallel to the axis of the tool shank 1. The bottom wall of the welding groove 11 extends horizontally and is perpendicular to the axis of the tool shank 1. The welding surface of the welding groove 11 is kept flat, thereby reducing the stress change during welding of the tool part 2.

[0037] The cutting edge 21 is provided on the cutting part 2, and the cutting edge of the cutting part 2 is located at the cutting edge 21. The cutting part 2 has an L-shaped structure, which reduces the rotational cutting radius of the cutting edge, thereby reducing the stress generated by the cutting part 2 during cutting. By setting the cutting part 2 to an L-shape, the rotational radius of the cutting edge on its side is reduced, which can further reduce the stress generated by the cutting edge of the cutting part 2 during processing. Since the difference in the coefficient of thermal expansion between the cutting part 2 and the tool holder 1 is large during welding, the contraction of the tool holder 1 during the welding cooling process will compress the cutting part 2, causing stress at the contact interface and easily leading to cracking of the cutting edge of the cutting part 2. In this embodiment, the cutting edge 21 extends completely out of the welding groove 11, so that the upper part of the cutting part 2 is suspended, and the lower surface of the cutting part 2 is welded to the welding surface of the welding groove 11. This can reduce the contact area between the cutting part 2 and the tool holder 1, thereby reducing the thermal stress generated during welding. Furthermore, the suspension of the cutting edge 21 can prevent the thermal stress during welding from being directly transmitted to the cutting edge of the cutting edge 21. Furthermore, after welding the blade part 2, the cutting edge of the blade part 2 needs to be laser-cut and angle-grinded. If the area of ​​the cutting edge 21 is completely fixed to the wall of the welding groove 11, the restricted expansion will create tensile stress, which can easily lead to cracks in the blade part 2. The suspended part of the cutting edge 21 is free from the constraint of the tool holder 1, allowing the cutting edge 21 to deform slightly during cutting, releasing thermal expansion stress. In addition, the cutting edge at the position of the cutting edge 21 is in contact with the air, resulting in faster heat dissipation, reducing the temperature gradient in the area of ​​the cutting edge 21, and reducing the accumulation of thermal stress.

[0038] Furthermore, the tool holder 1 includes a first segment 12 and a second segment 13 connected together. The welding groove 11 is formed in the first segment 12, and the diameter of the first segment 12 is smaller than the diameter of the second segment 13. The first segment 12 and the second segment 13 extend along the same axis, and are connected by a tapered transition to enhance the connection strength between them. In this embodiment, the diameter of the first segment 12 is smaller than the diameter of the second segment 13. The diameter of the first segment 12 is 5.0 mm, and the length of the first segment 12 is 4.0 mm. The diameter of the second segment 13 is 6.0 mm, and the length of the second segment 13 is 40 mm. The small-diameter tool holder 1 is used for machining precision equipment, such as high-gloss machining of the hole in a mobile phone lens frame. The two-section design allows the tool holder 1 to maintain overall strength while allowing the welding groove 11 to be formed on the small-diameter first segment 12, thus adapting to the needs of small-diameter tools. The smaller diameter of the first segment 12 facilitates precision machining in a small space, while the larger diameter of the second segment 13 provides sufficient support strength to prevent the tool holder 1 from breaking during use.

[0039] Further, the welding groove 11 is slotted through the axis of the tool holder 1, and the distance from the side wall of the welding groove 11 to the axis of the tool holder 1 is 0.7-0.75mm. In this embodiment, the tool holder 1 is cylindrical, the height of the welding groove 11 along the axis of the tool holder 1 is 2.6mm, and the depth of the welding groove 11 along the direction perpendicular to the axis of the tool holder 1 is 3.2mm. That is, the slotting depth of the welding groove 11 is greater than the radius of the first segment 12. Specifically, the distance from the side wall of the welding groove 11 in the depth direction to the axis of the tool holder 1 is 0.7mm. It can be understood that the distance from the side wall of the welding groove 11 to the axis of the tool holder 1 can also be 0.75mm. Since the thickness of the blade part 2 in this embodiment is 0.75mm, when the blade part 2 is installed on the side wall of the welding groove 11, the cutting edge of the blade part 2 can be located exactly on the axis of the tool holder 1 to reduce the offset of the cutting edge. When the tool holder 1 rotates, the radius of rotation of the tool part 2 decreases, and the direction of the cutting force on the tool part 2 becomes more stable. This reduces vibration during the rotational cutting process, helps to reduce stress concentration in the tool part 2, and thus improves its service life. It should be noted that if the distance from the sidewall of the welding groove 11 to the axis of the tool holder 1 exceeds 0.75mm, too much of the first section 12 will be cut, reducing its strength and making the tool holder 1 more susceptible to damage.

[0040] Furthermore, the end of the cutting tool 2 is provided with a clearance angle 22, which is the angle between the end face of the cutting tool 2 and the horizontal line, and the clearance angle 22 is 20-25 degrees. The clearance angle 22 is provided on the upper end face and the side end face of the cutting tool 2. The clearance angle 22 is used to allow the cutting tool 2 to avoid the workpiece during the cutting process, reduce cutting resistance, prevent rotational interference after the finished product, and improve cutting efficiency. In this embodiment, the clearance angle 22 is 20 degrees. It should be noted that the clearance angle 22 is between 20 degrees and 25 degrees. Since the clearance angle 22 is the angle between the end face of the cutter 2 and the horizontal line, when the clearance angle 22 is large, the part of the end of the cutter 2 that is cut off and retained is less. Conversely, when the clearance angle 22 is small, the space for the end of the cutter 2 to avoid the workpiece is reduced. When the clearance angle 22 is between 20 degrees and 25 degrees, the strength of the cutter 2 is guaranteed, and the poor avoidance effect due to the angle being too small is avoided.

[0041] Furthermore, the cutting tool 2 is provided with a first cutting edge 23, a second cutting edge 24, a third cutting edge 25, and a fourth cutting edge 26 extending out of the welding groove 11 at the cutting edge 21. The first cutting edge 23 is located at the top of the cutting tool 2 and is perpendicular to the axis of the tool shank 1. The second cutting edge 24 is parallel to the axis of the tool shank 1. The third cutting edge 25 has a rounded corner to connect the second cutting edge 24 and the fourth cutting edge 26. The fourth cutting edge 26 is located at the bottom of the cutting edge 21. The cutting tool 2 is L-shaped, and the cutting edges are arranged around the cutting edge 21. The first cutting edge 23, the second cutting edge 24, the third cutting edge 25, and the fourth cutting edge 26 are connected in sequence so that the tool can perform multi-directional cutting simultaneously during the cutting process, thereby improving cutting efficiency and machining accuracy. In this embodiment, the first cutting edge 23 is located at the top of the cutting part 2 and extends laterally for horizontal cutting. The length of the first cutting edge 23 is 1.7 mm. The second cutting edge 24 extends vertically and has a length of 2.9 mm. The third cutting edge 25 has a rounded corner design, which makes the cutting transition smooth. The radius of curvature of the third cutting edge 25 is 0.2 mm. The fourth cutting edge 26 is located at the bottom of the cutting edge 21. The second cutting edge 24, the third cutting edge 25 and the fourth cutting edge 26 partially enclose the cutting edge 21, and make the cutting part 2 have an L-shaped structure.

[0042] Furthermore, the first cutting edge 23 extends 3.5-3.7 mm beyond the welding groove 11, and the fourth cutting edge 26 extends 0.3-0.49 mm beyond the welding groove 11. In this embodiment, the depth of the cutting edge 21 along the axis of the tool holder 1 is 3.21 mm, the height of the first cutting edge 23 is 3.7 mm, and the height of the fourth cutting edge 26 is 0.49 mm, thereby ensuring that the first cutting edge 23 can perform a deeper cut. The height of the first cutting edge 23 is 3.5-3.7mm. When the height of the first cutting edge 23 extending out of the welding groove 11 is greater than 3.7mm, the overhang length of the cutting part 2 is too large, and it is easy to break during cutting. When the height of the first cutting edge 23 extending out of the welding groove 11 is less than 3.5mm, the height of the fourth cutting edge 26 extending out of the welding groove 11 is 0.3mm. At this time, because the distance between the fourth cutting edge 26 and the welding groove 11 is too small, after welding, the cutting edge will be affected by stress in multiple directions of the tool holder 1. Furthermore, during subsequent laser cutting or grinding of the cutting edge, the tool holder 1 is close to the cutting edge, which will also cause the cutting part 2 to be affected by stress changes.

[0043] Further, the distance from the second cutting edge 24 to the axis of the tool holder 1 is 0.85-1.1 mm, and the distance from the right side of the tool part 2 to the axis of the tool holder 1 is 0.6-0.85 mm. In this embodiment, the distance between the second cutting edge 24 and the axis of the tool holder 1 is 0.9 mm, and the distance from the right side of the tool part 2 opposite to the second cutting edge 24 to the axis of the tool holder 1 is 0.8 mm, thereby ensuring the balance of the tool part 2 during the rotary cutting process and reducing the vibration and cutting instability caused by the eccentricity of the tool part 2. The second cutting edge 24 and the right side of the tool part 2 are located on opposite sides of the tool part 2, and the rotation radius of the second cutting edge 24 is always greater than the rotation radius of the right side of the tool part 2, so that the right side of the tool part 2 will not collide with the workpiece during rotation. Furthermore, when the distance between the second cutting edge 24 and the axis of the tool holder 1 reaches 1.1mm, the left side of the lower end of the tool part 2 is just located at the left opening edge of the welding groove 11, and the distance between the second cutting edge 24 and the axis of the tool holder 1 does not exceed 1.1mm, so that the left side of the lower end of the tool part 2 will not extend beyond the left opening edge of the welding groove 11.

[0044] Furthermore, the cutting edge width of each cutting edge on the cutting tool 2 is 0.08-0.13 mm. In this embodiment, the first cutting edge 23, the second cutting edge 24, the third cutting edge 25, and the fourth cutting edge 26 are respectively subjected to grinding wheel grinding and fine polishing. The grinding wheel grinding controls the cutting edge width to 0.1-0.13 mm, and the fine polishing process controls the cutting edge width to 0.08-0.1 mm. Controlling the cutting edge width between 0.08-0.13 mm allows the cutting tool 2 to maintain high cutting accuracy during the cutting process, while reducing cutting resistance, improving cutting efficiency, and making it easier to achieve a high-gloss effect on the precision workpiece to be processed. Specifically, the specific parameters of the cutting edge width can be selected within the range of 0.08-0.13 mm according to requirements.

[0045] Further references can be made. Figure 5 The clearance angle 27 of each cutting edge on the cutting tool 2 is 2-4 degrees. The clearance angle 27 is formed by grinding the first cutting edge 23, the second cutting edge 24, the third cutting edge 25, and the fourth cutting edge 26 on the cutting tool 2 with a grinding wheel. The clearance angle 27 is the angle between the plane of the cutting edge and the rotating cutting surface. In this embodiment, the rotating cutting surface of the first cutting edge 23 is a horizontal plane, and the angle between the first cutting edge 23 and this plane is 3 degrees. Similarly, the rotation path of the second cutting edge 24 is cylindrical, and the rotating cutting surface is the tangent of the cylindrical path. The angle between the second cutting edge 24 and this plane is 3 degrees. The clearance angle 27 ensures that the cutting edge maintains high sharpness during cutting and facilitates the removal of cutting chips, reducing wear on the cutting tool 2.

[0046] Furthermore, the cutting tool 2 is made of CVD diamond. In this embodiment, the length, width, and thickness of the cutting tool 2 are 6mm, 3mm, and 0.75mm, respectively. The use of CVD diamond material in the cutting tool 2 improves its hardness and wear resistance, making it suitable for high-precision, high-strength cutting operations. CVD diamond has good toughness and is not easily broken, thus reducing the likelihood of cracks appearing in the cutting tool 2 under stress. Additionally, the excellent thermal conductivity of the CVD diamond cutting tool 2 effectively reduces the temperature during the cutting process, minimizing deformation and wear caused by high temperatures.

[0047] 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 high-strength forming milling cutter, characterized in that, include: A tool holder has a welding groove at its end, the sidewall of which is parallel to the axis of the tool holder and the bottom wall of which is perpendicular to the axis of the tool holder. The blade is fixed to the welding groove, and the blade has a cutting edge and an L-shaped structure, with the cutting edge extending completely out of the welding groove.

2. The high-strength forming milling cutter according to claim 1, characterized in that, The tool holder includes a first section and a second section connected to each other, and the welding groove is formed in the first section, the diameter of the first section being smaller than the diameter of the second section.

3. The high-strength forming milling cutter according to claim 1, characterized in that, The welding groove is cut through the axis of the tool holder, and the distance from the side wall of the welding groove to the axis of the tool holder is 0.7-0.75mm.

4. The high-strength forming milling cutter according to claim 1, characterized in that, The end of the blade is provided with a clearance angle, which is the angle between the end face of the blade and the horizontal line, and the clearance angle is 20-25 degrees.

5. The high-strength forming milling cutter according to claim 1, characterized in that, The cutting edge is provided with a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge, all extending out of the welding groove at the cutting edge position; the first cutting edge is located at the top of the cutting edge and is perpendicular to the axis of the cutting shank, the second cutting edge is parallel to the axis of the cutting shank, the third cutting edge is rounded to connect the second cutting edge and the fourth cutting edge, and the fourth cutting edge is located at the bottom of the cutting edge.

6. The high-strength forming milling cutter according to claim 5, characterized in that, The first cutting edge extends 3.5-3.7 mm beyond the welding groove, and the fourth cutting edge extends 0.3-0.49 mm beyond the welding groove.

7. The high-strength forming milling cutter according to claim 5, characterized in that, The distance from the second cutting edge to the axis of the cutting rod is 0.85-1.1mm, and the distance from the right side of the cutting part to the axis of the cutting rod is 0.6-0.85mm.

8. The high-strength forming milling cutter according to claim 5, characterized in that, The blade width of each cutting edge on the blade is 0.08-0.13mm.

9. The high-strength forming milling cutter according to claim 5, characterized in that, The back angle of each blade on the blade section is 2-4 degrees.

10. The high-strength forming milling cutter according to any one of claims 1 to 9, characterized in that, The cutting edge is made of CVD diamond.

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