High-precision welding milling cutter for difficult-to-machine plates
By designing a high-precision welded end mill with a spherical structure and TiAlN coating, the problems of cutting resistance and vibration in difficult-to-machine plates were solved, achieving efficient and stable machining results and extending the tool life.
Patent Information
- Application Number
- CN202423281477.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the existing technology, traditional milling cutters are prone to high cutting resistance and severe machining vibration when machining difficult-to-machine plates such as high-strength alloys, titanium alloys and composite materials, resulting in low machining efficiency and tool breakage, which affects service life and machining accuracy.
A high-precision welded milling cutter was designed, which adopts a spherical milling cutter body with four cutting edges arranged circumferentially. Two of the cutting edges are smoothly connected by a connecting section, and the other two cutting edges have end cutting parts on their end faces. The cutting edge surfaces are coated with TiAlN coating. The milling cutter body and the tool holder are connected by brazing. The materials are tungsten carbide and alloy steel.
It effectively reduces cutting resistance, minimizes vibration, improves machining stability and efficiency, extends tool life, and ensures machining quality.
Smart Images
Figure CN223833532U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of milling cutters, and in particular to a high-precision welded milling cutter for difficult-to-machine plates. Background Technology
[0002] Welded end mills are milling cutters formed by welding the cutting part of the tool to the tool holder. Compared with solid end mills, welded end mills can select different material combinations according to actual needs to achieve an optimal balance between performance and cost.
[0003] In the existing technology, with the widespread application of difficult-to-machine plates such as high-strength alloys, titanium alloys and composite materials in the industrial field, traditional milling cutters are prone to problems such as high cutting resistance and severe machining vibration during milling, resulting in low machining efficiency, difficulty in guaranteeing machining quality, and even tool chipping and damage, affecting the tool's service life and the machining accuracy of the workpiece.
[0004] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a high-precision welded end mill for difficult-to-machine plates that reduces cutting resistance and machining vibration.
[0006] To achieve this objective, the present invention adopts the following technical solution: a high-precision welded milling cutter for difficult-to-machine plates, comprising a cylindrical shank and a milling cutter body welded to the end of the shank, wherein the end of the milling cutter body has a spherical structure;
[0007] The milling cutter body has four spaced cutting edges along its circumference. The cutting edges are spirally arranged along the extension direction of the milling cutter body. Two of the symmetrically arranged cutting edge end faces are smoothly connected by a connecting section to form an integral structure. The other two symmetrically arranged cutting edge end faces are provided with end cutting portions.
[0008] A gap is formed between the end blade and the side wall of the connecting section;
[0009] The top surface of the cutting edge is provided with a first cutting surface and a second cutting surface. Both the first cutting surface and the second cutting surface are arc-shaped structures, and the intersection between the first cutting surface and the second cutting surface forms the tip of the cutting edge.
[0010] A chip removal groove is formed between two adjacent cutting edges, and a flat portion is provided in the area of the cutting edge away from the end face. The flat portion is used to guide and transport the machining chips into the chip removal groove.
[0011] Using the above technical solution, in the high-precision welding milling cutter for difficult-to-machine plates, the surfaces of the first cutting edge and the second cutting edge are coated with a TiAlN coating;
[0012] The thickness of the TiAlN coating is 2-8 μm.
[0013] Using the above technical solution, in the high-precision welding milling cutter for difficult-to-machine plates, the sidewall of the connecting section is provided with a first inclined surface and a second inclined surface;
[0014] The intersection of the first inclined plane and the second inclined plane forms an included angle, which is 120-160°.
[0015] Using the above technical solution, the gap size in the high-precision welding milling cutter for difficult-to-machine plates is 2-4mm.
[0016] Using the above technical solution, in the high-precision welding milling cutter for difficult-to-machine plates, the radius of curvature of the first cutting surface is smaller than the radius of curvature of the second cutting surface.
[0017] Using the above technical solution, in the high-precision welding milling cutter for difficult-to-machine plates, the helix angle of the cutting edge is 30-36°.
[0018] Using the above technical solution, the surface roughness of the milling cutter body in the high-precision welding milling cutter for difficult-to-machine plates is 0.15-0.35.
[0019] Using the above technical solution, the width of the chip removal groove in the high-precision welding milling cutter for difficult-to-machine plates is 10-24mm.
[0020] Using the above technical solution, in the high-precision welded end mill for difficult-to-machine plates, the end mill body is made of tungsten carbide, the tool holder is made of alloy steel, and the end mill body and the tool holder are connected by brazing.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] This invention features a spherical end structure for the milling cutter body, which effectively reduces the instantaneous cutting impact on the workpiece, thereby reducing cutting vibration, preventing chipping, and improving the stability of the machining process. The milling cutter body has four circumferential cutting edges, two of which are smoothly connected by a connecting section, effectively dispersing cutting stress and ensuring a smooth and stable cutting process. The other two cutting edges have end faces with helical cutting edges, enabling efficient multi-directional cutting of the workpiece. The TiAlN coating applied to the cutting edge surface reduces the coefficient of friction, allowing the milling cutter to maintain stable machining performance under high loads, thus improving machining efficiency and extending tool life. Attached Figure Description
[0023] 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.
[0024] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0026] Figure 2 This is a side view of the present invention.
[0027] Figure 3 This is a schematic diagram of the central structure of the milling cutter body of this utility model. Detailed Implementation
[0028] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below 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 skilled in the art without creative effort are within the scope of protection of the present utility model.
[0029] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.
[0030] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0031] like Figures 1 to 3 As shown, this utility model embodiment provides a high-precision welded end mill for difficult-to-machine plates, including a cylindrical shank 1 and an end mill body 2 welded to the end of the shank 1. The end of the end mill body 2 has a spherical structure. The spherical structure of the end mill body 2 can effectively reduce the instantaneous cutting impact force on the machined plate, thereby reducing cutting vibration and improving the stability of the machining process. In addition, the spherical structure of the end mill body 2 makes the entry and exit of the workpiece smoother, avoiding chipping due to sudden contact, thereby improving the durability of the end mill and extending the service life of the tool.
[0032] The milling cutter body 2 has four spaced cutting edges 21 arranged circumferentially. The cutting edges 21 are spirally arranged along the extension direction of the milling cutter body 2. The end faces of two symmetrically arranged cutting edges 21 are smoothly connected by a connecting section 22 to form an integral structure. The end faces of the other two symmetrically arranged cutting edges 21 are provided with end cutting portions 210. The connection of the end faces of the two symmetrically arranged cutting edges 21 to form an integral structure allows the cutting edges 21 to achieve a smooth transition during the cutting process, reducing the concentrated stress on the cutting edge, effectively preventing tool chipping, and improving cutting stability. The end cutting portions 210 on the end faces of the other two symmetrically arranged cutting edges 21 enable the milling cutter to have end face cutting capability. Combined with the cutting action of the cutting edges 21 in the spiral side cutting direction, it is possible to achieve multi-directional cutting of the sheet metal. A gap is formed between the end cutting portions 210 and the side wall of the connecting section 22. The gap serves as a guide and buffer, allowing the chips to be smoothly discharged outward through the gap.
[0033] The top surface of the cutting edge 21 is provided with a first cutting surface 211 and a second cutting surface 212. Both the first cutting surface 211 and the second cutting surface 212 are arc surface structures, and the intersection between the first cutting surface 211 and the second cutting surface 212 forms a cutting tip 213. The cutting tip 213 can improve the sharpness of the cutting edge 21, thereby reducing cutting resistance and improving cutting accuracy.
[0034] A chip removal groove 23 is formed between two adjacent cutting edges 21. A flat portion 214 is provided in the area of the cutting edge 213 away from the end face. The flat portion 214 is used to guide and transport the machining chips into the chip removal groove 23, so that the chips are discharged along a preset flow path, preventing the chips from staying in the cutting area and affecting the stability of the machining.
[0035] Furthermore, the surfaces of the first cutting edge 211 and the second cutting edge 212 are coated with a TiAlN coating. The thickness of the TiAlN coating is 2-8 μm. In this embodiment, the thickness of the TiAlN coating is 4 μm. The TiAlN coating can improve the hardness of the cutting edge 21, while reducing the coefficient of friction with the workpiece, reducing cutting resistance, and enabling the milling cutter to maintain stable cutting performance under high load machining conditions, thereby improving machining efficiency.
[0036] like Figure 3 As shown, the sidewall of the connecting section 22 is provided with a first inclined surface 221 and a second inclined surface 222. The intersection of the first inclined surface 221 and the second inclined surface 222 forms an included angle α, which is 120-160°. In this embodiment, the included angle α is 145°. During the formation of cutting chips, the first inclined surface 221 and the second inclined surface 222 can guide the flow of chips and smoothly guide and transport the chips into the chip discharge groove 23, so as to avoid chip accumulation from interfering with the cutting edge 21.
[0037] Furthermore, the size of the gap is 2-4 mm, and in this embodiment, the size of the gap is 2 mm.
[0038] Furthermore, the radius of curvature of the first cutting edge 211 is smaller than that of the second cutting edge 212. The first cutting edge 211 can quickly cut into the workpiece in the initial stage of cutting, reducing cutting resistance and instantaneous impact force. The second cutting edge 212 has a larger radius of curvature, which can form a smooth transition area, making the cutting process more continuous and stable, and avoiding the problem of chipping caused by the cutting edge being too sharp.
[0039] like Figure 2 As shown, further, the helix angle β of the cutting edge 21 is 30-36°. In this embodiment, the helix angle β of the cutting edge 21 is 36°, which allows the cutting edge 21 to gradually cut into the material, reducing the impact force and vibration generated by the cutting edge 21 during the cutting process, and making the cutting process smoother and more stable.
[0040] Furthermore, the surface roughness of the milling cutter body 2 is 0.15-0.35. In this embodiment, the surface roughness of the milling cutter body 2 is 0.15. This reduces frictional resistance during milling, reduces heat accumulation, and improves the durability and cutting stability of the tool.
[0041] Furthermore, the width of the chip removal groove 23 is 10-24mm. In this embodiment, the width of the chip removal groove 23 is 20mm. This setting can improve the flow efficiency of chips and prevent chip blockage.
[0042] Furthermore, the milling cutter body 2 is made of tungsten carbide, and the tool holder 1 is made of alloy steel. The milling cutter body 2 and the tool holder 1 are connected by brazing. Tungsten carbide has extremely high hardness, wear resistance, and good high-temperature resistance, enabling the milling cutter body 2 to withstand the high cutting load and frictional heat from difficult-to-machine materials during cutting, maintaining the sharpness of the cutting edge 21, effectively reducing wear and chipping, and extending the tool's service life. The tool holder 1 is made of alloy steel, which has high strength and good toughness, providing sufficient rigidity and vibration resistance, ensuring the tool remains stable during high-speed rotating cutting and preventing deformation or breakage.
[0043] This invention features a spherical end structure for the end of the milling cutter body 2, which effectively reduces the instantaneous cutting impact on the workpiece, thereby reducing cutting vibration, preventing chipping, and improving the stability of the machining process. The milling cutter body 2 has four cutting edges 21 arranged circumferentially, two of which are smoothly connected by a connecting section 22, effectively dispersing cutting stress and ensuring a smooth and stable cutting process. The other two cutting edges 21 have end face portions 210, which, combined with the helical cutting edges 21, enable efficient multi-directional cutting of the workpiece. The TiAlN coating applied to the surface of the cutting edges 21 reduces the coefficient of friction, allowing the milling cutter to maintain stable machining performance under high loads, thereby improving machining efficiency and extending tool life.
[0044] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A high-precision welding end mill for difficult-to-machine sheet metal, characterized in that, It includes a cylindrical tool holder and a milling cutter body welded to the end of the tool holder, wherein the end of the milling cutter body has a spherical structure; The milling cutter body has four spaced cutting edges along its circumference. The cutting edges are spirally arranged along the extension direction of the milling cutter body. Two of the symmetrically arranged cutting edge end faces are smoothly connected by a connecting section to form an integral structure. The other two symmetrically arranged cutting edge end faces are provided with end cutting portions. A gap is formed between the end blade and the side wall of the connecting section; The top surface of the cutting edge is provided with a first cutting surface and a second cutting surface. Both the first cutting surface and the second cutting surface are arc-shaped structures, and the intersection between the first cutting surface and the second cutting surface forms the tip of the cutting edge. A chip removal groove is formed between two adjacent cutting edges, and a flat portion is provided in the area of the cutting edge away from the end face. The flat portion is used to guide and transport the machining chips into the chip removal groove.
2. The high-precision welding end mill for difficult-to-machine plates according to claim 1, characterized in that, The surfaces of the first and second cutting edges are coated with a TiAlN coating; The thickness of the TiAlN coating is 2-8 μm.
3. The high-precision welding end mill for difficult-to-machine plates according to claim 1, characterized in that, The sidewall of the connecting section is provided with a first inclined surface and a second inclined surface; The intersection of the first inclined plane and the second inclined plane forms an included angle, which is 120-160°.
4. The high-precision welding end mill for difficult-to-machine plates according to claim 1, characterized in that, The size of the gap is 2-4 mm.
5. The high-precision welding end mill for difficult-to-machine plates according to claim 1, characterized in that, The radius of curvature of the first cutting surface is smaller than the radius of curvature of the second cutting surface.
6. The high-precision welding milling cutter for difficult-to-machine plates according to claim 1, characterized in that, The helix angle of the cutting edge is 30-36°.
7. The high-precision welding end mill for difficult-to-machine plates according to claim 1, characterized in that, The surface roughness of the milling cutter body is 0.15-0.
35.
8. The high-precision welding milling cutter for difficult-to-machine plates according to claim 1, characterized in that, The width of the chip removal groove is 10-24mm.
9. The high-precision welding end mill for difficult-to-machine plates according to any one of claims 1-8, characterized in that, The milling cutter body is made of tungsten carbide, and the tool holder is made of alloy steel. The milling cutter body and the tool holder are connected by brazing.