Spiral groove milling cutter

Abstract

The utility model discloses a spiral groove milling cutter which comprises a cutter bar base body and a cutting edge portion located at the front end of the cutter bar base body, the cutting edge portion comprises a plurality of spiral circumferential cutting edges surrounding the cutter bar base body, the spiral circumferential cutting edges are distributed in a strip shape in the axial direction of the cutter bar base body, and the adjacent spiral circumferential cutting edges are connected through chip grooves. A concave U-shaped spiral groove is formed in the circumferential side face of the spiral circumferential blade, the U-shaped spiral groove and the spiral circumferential blade extend in the same direction, and a metal deposition layer and a superhard sintering layer are sequentially arranged along the surface of the U-shaped spiral groove. According to the structure, the sharpness and the wear resistance of the milling cutting edge are considered while smooth chip removal is guaranteed, the machining quality is improved, and the service life of the milling cutter is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of CNC milling, and in particular to a spiral groove milling cutter. Background Technology

[0002] Existing milling cutter materials are mainly cemented carbide. However, during the machining process, the smoothness of chip removal, the sharpness of the milling cutting edge, and the wear resistance are all key factors affecting the machining quality. Milling cutters can remove chips more smoothly during milling, reduce the impact of cutting forces, and improve machining accuracy. High hardness, high sharpness, and good wear resistance of the milling cutting edge can significantly improve the cutting performance and machining accuracy of the tool, and also extend the service life of the milling cutter.

[0003] However, existing technologies often struggle to simultaneously address all of these factors. For instance, to address the issue of low wear resistance and easy dulling of milling cutting edges, which leads to a decline in milling quality, existing technologies typically address this by increasing the strength of the milling tool's matrix or adding a wear-resistant coating to the surface of the cutting edge, but the improvement is limited. Existing technologies also employ polycrystalline diamond (PCD) structures as the material for milling cutting edges; however, due to the different materials, the bonding strength between the PCD structure and the tool matrix is ​​poor. This results in high interfacial stress during use, causing the milling tool to crack or the PCD structure to peel off, affecting machining quality and efficiency, and also impacting the lifespan of the milling tool.

[0004] Therefore, it is necessary to improve milling tools to simultaneously meet the requirements of smooth chip removal, high sharpness, good wear resistance, and long service life. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a spiral groove end mill that ensures smooth chip removal while taking into account the sharpness and wear resistance of the milling cutting edge, thereby improving the machining quality and extending the service life of the milling tool.

[0006] The technical solution of this utility model is as follows: it includes a cutting rod base and a cutting edge portion located at the front end of the cutting rod base. The cutting edge portion includes a plurality of spiral peripheral blades surrounding the cutting rod base. The plurality of spiral peripheral blades are distributed in a strip along the axial direction of the cutting rod base, and adjacent spiral peripheral blades are connected by chip removal grooves. The peripheral side of the spiral peripheral blades is provided with a concave U-shaped spiral groove. The U-shaped spiral grooves extend in the same direction as the spiral peripheral blades. A metal deposition layer and an ultra-hard sintered layer are sequentially provided along the surface of the U-shaped spiral grooves.

[0007] Furthermore: the U-shaped spiral groove is provided at the front end of the spiral peripheral blade along the spiral direction, and the milling cutting edge of the spiral peripheral blade for milling is located on the ultra-hard sintered layer.

[0008] Furthermore, the width of the U-shaped spiral groove opening is smaller than the width of the circumferential side surface of the spiral edge.

[0009] Furthermore, the U-shaped spiral grooves are distributed along the entire axial extension direction of the spiral circumferential edge.

[0010] Furthermore, the front end face of the cutting tool base is provided with an end cutting edge corresponding to the milling cutting edge, and the end cutting edge is located in the extension direction of the milling cutting edge.

[0011] Furthermore, the spiral peripheral blade, chip removal groove, and U-shaped spiral groove are all spirally distributed.

[0012] Furthermore: the spiral peripheral cutting edge includes a rake face and a flank face in sequence along the spiral direction, the milling cutting edge is formed by the intersection of the rake face and the flank face, and the rake face is located on the superhard sintered layer.

[0013] Furthermore, the spiral circumferential blade is provided in four sets, and the four sets of spiral circumferential blades are evenly distributed around the blade base.

[0014] Furthermore, the end blades have a flat-head structure, and all of the end blades are located on the same plane.

[0015] The beneficial technical effects of this utility model are as follows: The U-shaped spiral groove design on the circumferential side of the spiral cutting edge, with a metal deposition layer and a superhard sintered layer sequentially applied to the surface of the U-shaped spiral groove, reduces the interfacial stress between the cutting tool substrate and the superhard sintered layer, and improves the bonding strength between the two. This structure ensures the high sharpness and high wear resistance of the milling cutter during use, while preventing the superhard sintered layer from peeling off during use, thus affecting its service life. Furthermore, the spiral structure design of the chip removal groove allows for smoother chip removal during milling, improving machining accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the specific structure of the spiral circumferential blade of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the U-shaped spiral groove of this utility model;

[0019] Among them: 1. Cutting edge; 2. Handle; 3. Spiral peripheral cutting edge; 31. Rake face; 32. Milling cutting edge; 33. Back face; 4. End cutting edge; 5. Chip removal groove; 6. U-shaped spiral groove; 7. Metal deposition layer; 8. Ultra-hard sintered layer. Detailed Implementation

[0020] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] like Figure 1 As shown, this utility model discloses a spiral groove milling cutter for milling metal in a CNC machine tool; it includes a cutter bar base, a cutting edge portion 1 located at the front end of the cutter bar base, and a shank portion 2 located at the rear end of the cutter bar base. The cutter bar base is cylindrical, and the cutting edge portion 1 includes a plurality of spiral peripheral cutting edges 3 evenly distributed along the circumference of the cutter bar base. In this embodiment, the plurality of spiral peripheral cutting edges 3 are all spiral-shaped and distributed in a band along the axial direction of the cutting edge portion 1.

[0022] Adjacent spiral peripheral cutting edges 3 are connected by chip removal grooves 5. The number of chip removal grooves 5 is consistent with the number of spiral peripheral cutting edges 3 and end cutting edges 4, and can be set to two, three, four or more. In this embodiment, there are four chip removal grooves 5. The chip removal grooves 5 are used to remove the processed chips and avoid the chips from accumulating in the processing area, which would affect the processing accuracy and the life of the milling cutter.

[0023] like Figure 2 As shown, the helical peripheral cutting edge 3 includes a rake face 31, a milling cutting edge 32 for milling, and a flank face 33 in sequence along the helical direction. The rake face 31 is a helical surface, and the milling cutting edge 32 is a helical curve formed by the intersection of the rake face 31 and the flank face 33.

[0024] In actual machining, since the milling cutting edge 32 is the first to contact the workpiece, it experiences the greatest resistance and is most prone to wear. In this embodiment, as... Figure 3 As shown, the peripheral side of the spiral peripheral blade 3 is provided with a concave U-shaped spiral groove 6, which extends in the same direction as the spiral peripheral blade 3. The U-shaped spiral groove 6 is spirally distributed along the entire axial extension direction of the spiral peripheral blade 3. A metal deposition layer 7 and an ultra-hard sintered layer 8 are sequentially provided along the surface of the U-shaped spiral groove 6. The metal deposition layer 7 is located between the U-shaped spiral groove 6 and the ultra-hard sintered layer 8. The metal deposition layer 7 can not only reduce the interfacial stress between the blade substrate and the ultra-hard sintered layer 8, but also improve the bonding interface between the blade substrate and the ultra-hard sintered layer 8 and increase the bonding strength.

[0025] In this embodiment, the tool bar substrate is made of cemented carbide material, and the ultra-hard sintered layer 8 is a polycrystalline diamond structure. This polycrystalline diamond structure is formed by sintering under high temperature and high pressure conditions and fixed in the U-shaped spiral groove 6, which has higher hardness and higher wear resistance than the tool bar substrate.

[0026] In this embodiment, the U-shaped spiral groove 6 is disposed at the front end of the spiral peripheral cutting edge 3 along the spiral direction, and the milling cutting edge 32 of the spiral peripheral cutting edge 3 for milling is located on the superhard sintered layer 8. At the same time, the rake face 31 and the flank face 33 are also located on the superhard sintered layer 8. This can maintain the sharpness of the milling cutting edge 32, ensuring the accuracy and efficiency of machining. It can also take advantage of the high thermal conductivity of the polycrystalline diamond structure to quickly conduct the heat generated during machining away from the rake face 31, avoiding local overheating and affecting the service life of the milling cutter. At the same time, the wear resistance of the polycrystalline diamond structure also greatly reduces the contact wear between the flank face 33 and the workpiece during machining.

[0027] The front end face of the tool bar base is provided with end cutting edges 4 corresponding to the milling cutting edges 32. The end cutting edges 4 are located in the extension direction of the milling cutting edges 32, that is, several end cutting edges 4 are connected to several milling cutting edges 32 one by one. The end cutting edges 4 are formed by processing the front end face of the tool bar base. In this embodiment, the end cutting edges 4 have a flat head structure, that is, several end cutting edges 4 are all located on the same plane.

[0028] It is understandable that the end blade 4 extends outward from the core of the tool bar substrate, and the end blade 4 is sequentially the tool bar substrate, the metal deposition layer 7 and the ultra-hard sintered layer 8 along its extension direction.

[0029] It is understandable that the circumferential side of the spiral blade 3 can be provided with a concave U-shaped spiral groove 6, or a concave trapezoidal spiral groove, a semi-circular spiral groove, a rectangular spiral groove, etc., as needed.

[0030] In this embodiment, in order to further improve the bonding strength between the tool bar substrate and the ultra-hard sintered layer 8, U-shaped spiral grooves 6 are distributed at the front end of the spiral peripheral blade 3 along the spiral direction. At the same time, the groove width of the U-shaped spiral grooves 6 is designed to be smaller than the circumferential side width of the spiral peripheral blade 3, so that the back face 33 includes the ultra-hard sintered layer 8 and the tool bar substrate in the spiral direction, making the connection surface between the U-shaped spiral grooves 6 and the ultra-hard sintered layer 8 larger. Correspondingly, the area of ​​the metal deposition layer 7 between the U-shaped spiral grooves 6 and the ultra-hard sintered layer 8 is also larger, and the bonding strength between the two is improved accordingly.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A spiral groove end mill, comprising a cutter bar base and a cutting edge (1) located at the front end of the cutter bar base, characterized in that: The cutting edge (1) includes several spiral peripheral blades (3) surrounding the blade base. The spiral peripheral blades (3) are distributed in a strip along the axial direction of the blade base. Adjacent spiral peripheral blades (3) are connected by chip removal grooves (5). The peripheral side of the spiral peripheral blades (3) is provided with a concave U-shaped spiral groove (6). The U-shaped spiral groove (6) extends in the same direction as the spiral peripheral blades (3). A metal deposition layer (7) and an ultra-hard sintered layer (8) are sequentially provided along the surface of the U-shaped spiral groove (6).

2. The spiral groove end mill according to claim 1, characterized in that: The U-shaped spiral groove (6) is provided at the front end of the spiral peripheral blade (3) along the spiral direction, and the milling cutting edge (32) of the spiral peripheral blade (3) for milling is located on the ultra-hard sintered layer (8).

3. A spiral groove end mill according to claim 2, characterized in that: The groove width of the U-shaped spiral groove (6) is smaller than the circumferential width of the spiral circumferential blade (3).

4. A spiral groove end mill according to claim 1, characterized in that: The U-shaped spiral groove (6) is distributed along the entire axial extension direction of the spiral circumferential blade (3).

5. A spiral groove end mill according to claim 2, characterized in that: The front end face of the cutting bar base is provided with an end cutting edge (4) corresponding to the milling cutting edge (32), and the end cutting edge (4) is located in the extension direction of the milling cutting edge (32).

6. A spiral groove end mill according to claim 1, characterized in that: The spiral peripheral blade (3), chip removal groove (5), and U-shaped spiral groove (6) are all spirally distributed.

7. A spiral groove end mill according to claim 2, characterized in that: The spiral peripheral cutting edge (3) includes a rake face (31) and a flank face (33) in sequence along the spiral direction. The milling cutting edge (32) is formed by the intersection of the rake face (31) and the flank face (33). The rake face (31) is located on the ultra-hard sintered layer (8).

8. A spiral groove end mill according to claim 1, characterized in that: The spiral peripheral blade (3) is provided in four sets, and the four sets of spiral peripheral blades (3) are evenly distributed around the blade base.

9. A spiral groove end mill according to claim 5, characterized in that: The end blade (4) has a flat-head structure, and several end blades (4) are located on the same plane.

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