Helical-edge MCD milling cutter

Abstract

The utility model relates to the technical field of superhard cutting, and particularly discloses a helical-edge MCD milling cutter. The helical-edge MCD milling cutter comprises a handle part and a cutter bar part which are connected with each other. And the cutter bar part is made of MCD. And the cutter bar part comprises three or more groups of circumferential edge ridges and three or more groups of end edge ridges. And the circumferential edge ridges and the end edge ridges have the same group number. The circumferential edge ridge is spiral and is provided with a spiral cutting edge, a first spiral rear tool face and a second spiral rear tool face which are sequentially connected in the lateral direction. And a spiral chip groove is formed between every two adjacent groups of circumferential blade ridges. And the helical angle of the circumferential blade ridge is 10-40 degrees. And the inclination angle of the first spiral rear cutter surface is 3-11 degrees. And the inclination angle of the second spiral rear cutter surface is 7-20 degrees. The milling cutter is provided with the spiral circumferential edge ridge, the cutting resistance is small during cutting operation, the spiral chip removal groove is formed, chips are centrifugally discharged during rotary cutting, and the chip removal performance is good. And the cutter bar part comprises three or more groups of circumferential edge ridges and three or more groups of end edge ridges, cutting operation is carried out at the same time, and the cutting efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of superhard cutting technology, and in particular to a spiral-edged MCD milling cutter. Background Art

[0002] Man-made single crystal diamond (MCD) has extremely high hardness and wear resistance. As a cutting tool, it has the advantages of high processing accuracy, long tool life, good processing surface quality, and can even achieve a mirror effect. It is widely used in precision and ultra-precision processing of non-metallic materials such as acrylic, non-ferrous metals such as aluminum, copper, and their alloys. The MCD milling cutter in the related technology includes a single-edge milling cutter, such as the single-edge milling cutter disclosed in patent CN202021932971.7. The structure of the single-edge milling cutter is as follows: Figure 1 There is also a double-edged milling cutter, such as the double-edged milling cutter disclosed in patent CN202023133406.7, the structure of which is as follows Figure 2 However, both have the following problems: 1. The side straight edge cutting has large cutting resistance and poor chip removal performance; 2. The number of cutting edges is small and the cutting efficiency is low. Utility Model Content

[0003] In view of the above problems, the present application provides a spiral-edged MCD milling cutter having at least two sets of spiral cutting edges to solve the problems of low cutting efficiency, large cutting resistance and poor chip removal performance in the current milling cutter processing.

[0004] A spiral blade MCD milling cutter comprises a shank portion and a shank portion connected to each other. The material of the shank portion is MCD. The shank portion comprises three or more groups of circumferential ridges and three or more groups of end ridges. The number of groups of the circumferential ridges and the end ridges is the same. The circumferential ridge is spiral, having a spiral cutting edge, a first spiral back blade surface and a second spiral back blade surface that are connected in sequence laterally. A spiral chip groove is provided between each two adjacent groups of circumferential ridges. The helix angle of the circumferential ridge is 10~40°. The inclination angle of the first spiral back blade surface is 3~11°. The inclination angle of the second spiral back blade surface is 7~20°. The inclination angle of the second spiral back blade surface is greater than the inclination angle of the first spiral back blade surface.

[0005] By adopting the above technical solution, the peripheral ridge is spiral, the cutting resistance is small during cutting operation, and the spiral chip removal groove is provided. During rotary cutting, the debris is centrifugally discharged, and the chip removal performance is good. The shank part includes three or more sets of peripheral ridges and three or more sets of end ridges, and the cutting operation is performed simultaneously, with high cutting efficiency.

[0006] A preferred embodiment of the helical blade MCD milling cutter is that the helix angle of the peripheral blade ridge is 30°, the inclination angle of the first helical flank surface is 5°, and the inclination angle of the second helical flank surface is 11°.

[0007] By adopting the above technical solution, the milling cutter has high cutting efficiency, a strong peripheral blade ridge structure, a long service life, and a gradually expanding back cutter surface that is conducive to chip removal.

[0008] A preferred embodiment of the spiral blade MCD milling cutter is that the end blade ridge has a straight edge, a first back blade straight surface and a second back blade fan surface which are connected in sequence laterally, and a straight chip groove is provided between each two adjacent groups of the end blade ridges.

[0009] By adopting the above technical solution, the straight edge cutting efficiency is high.

[0010] A preferred embodiment of the spiral blade MCD milling cutter is that the inclination angle of the second flank fan surface is greater than the inclination angle of the first flank straight surface. The inclination angle of the first flank straight surface is 3-14°. The inclination angle of the second flank fan surface is 5-15°.

[0011] By adopting the above technical solution, the chip removal effect is good, the blade is firm, and the friction between the blade surface and the cut surface is small.

[0012] A preferred embodiment of the spiral blade MCD milling cutter is that the inclination angle of the first flank straight surface is 7° and the inclination angle of the second flank fan surface is 11°.

[0013] By adopting the above technical solution, the blade is solid and durable, and the cutting efficiency is high.

[0014] A preferred embodiment of the spiral blade MCD milling cutter is that the straight blade descends from the periphery to the center, and the angle between the straight blade and the surface perpendicular to the axial direction of the shank portion is 1-5°.

[0015] By adopting the above technical solution, the smaller the angle, the greater the resistance, and the better the quality of the processed surface.

[0016] A preferred embodiment of the spiral-edge MCD milling cutter is that the angle between the straight edge and the surface perpendicular to the axial direction of the shank portion is 3°.

[0017] By adopting the above technical solution, the quality of the processed surface is excellent.

[0018] A preferred embodiment of the spiral blade MCD milling cutter is that the end edge ridge has a circular arc edge and a curved chip removal groove is provided between each two adjacent groups of the end edge ridges.

[0019] By adopting the above technical solution, the arc blade can mill various curved surfaces and arc grooves, which is suitable for semicircular edge milling.

[0020] In summary, the spiral blade MCD milling cutter of the present application has the following beneficial effects:

[0021] (1) The peripheral edge of the MCD milling cutter is a spiral edge, and the cutting resistance during milling is small.

[0022] (2) The spiral edge design of the MCD milling cutter is conducive to chip discharge.

[0023] (3) Multi-edge design improves cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a structural diagram of a single-edge milling cutter in the background technology.

[0025] Figure 2 The figure is a structural diagram of a double-edged milling cutter in the background technology.

[0026] Figure 3 This is a structural diagram of the first spiral blade MCD milling cutter of the present application.

[0027] Figure 4 for Figure 3 A magnified image of area A.

[0028] Figure 5 for Figure 3 Another perspective of the picture.

[0029] Figure 6 for Figure 5 A magnified view of area B.

[0030] Figure 7 for Figure 5 Cross-sectional view of the milling cutter after plane sectioning along the central axis.

[0031] Figure 8 for Figure 7 Magnified view of region C.

[0032] Fig. 9 This is a structural diagram of the second spiral blade MCD milling cutter of the present application.

[0033] Figure numerals: shank 1; shank 2; first welding surface 11; second welding surface 20; circular curved surface 12; peripheral ridge 21; end ridge 22; spiral cutting edge 211; first spiral back tool surface 212; second spiral back tool surface 213; spiral chip groove 23; straight edge 221; first back tool straight surface 222; second back tool fan surface 223; straight chip groove 24; arc edge 224; curved chip groove 25. DETAILED DESCRIPTION

[0034] The spiral blade MCD milling cutter of the present application is described in detail below with reference to the accompanying drawings.

[0035] Please refer to Figure 3A spiral blade MCD milling cutter comprises a shank 1 and a shank 2 connected to each other. The shank 1 may be cylindrical, and the shank 1 and the shank 2 are coaxially arranged. The two are inseparably connected together by vacuum welding through a first welding surface 11 of the shank 1 and a second welding surface 21 on the shank 2. The shank 1 is made of cemented carbide, and the shank 1 of the cemented carbide is processed by grinding, and the end away from the shank 2 is set as a circular curved surface 12, which is convenient for the installation of the milling cutter.

[0036] The material of the shank portion 2 is MCD. The shank portion 2 includes three or more groups of circumferential ridges 21 and three or more groups of end ridges 22, and the groups of the circumferential ridges 21 and the end ridges 22 are the same. For example, there are four groups of circumferential ridges 21 and four groups of end ridges 22. The four groups of circumferential ridges 21 are specially formed to extend toward the end to form the four groups of end ridges 22. The diameter of the shank portion 2 can be 0.05-0.8mm, that is, the outer diameter of the four groups of end ridges 22 is 0.05-0.8mm, for example, 0.7mm. The machining of the shank portion 2 is achieved by laser machining. When MCD is applied to cutting tools, its cleavage surface {111} surface should be avoided as a cutting edge. The circumferential ridges 21 and the end ridges 22 of the spiral blade MCD milling cutter of the present application should adopt MCD {110} or {100} surfaces, which should be synthesized within ±5°, so that the milling cutter has better wear resistance.

[0037] Please refer to Figure 4 The peripheral blade ridge 21 is spiral, having a spiral cutting edge 211, a first spiral flank 212 and a second spiral flank 213 connected in sequence laterally. A spiral chip groove 23 is formed between each two adjacent groups of the peripheral blade ridges 21. Four groups of spiral chip grooves 23 are formed between the four groups of peripheral blade ridges 21. The helix angle of the peripheral blade ridge 21 is 10~40°, for example, the helix angle of the peripheral blade ridge 21 is 30°. The helix angle is the angle between the tangent of the spiral cutting edge 211 and the axis of the shank portion 2.

[0038] The inclination angle of the second spiral back blade surface 213 is greater than the inclination angle of the first spiral back blade surface 212. The inclination angle is the angle between the blade surface and the cutting direction. The cutting direction of the peripheral blade ridge 21 is tangent to the circumferential tangent direction of the shank portion 2. Specifically, the inclination angle in the peripheral blade ridge 21 is, after cross-cutting the shank portion 2, on the cross-section, the angle between the blade surface and the tangent to the circumferential tangent of the shank portion 2. The inclination angle of the first spiral back blade surface 212 is 3~11°, for example, the inclination angle of the first spiral back blade surface 212 is 5°. The inclination angle of the second spiral back blade surface 213 is 7~20°, for example, the inclination angle of the second spiral back blade surface 213 is 11°.

[0039] In the above spiral blade MCD milling cutter, the circumferential blade ridge 21 is spiral, the cutting resistance during cutting operation is small, and it has a spiral chip groove 23. During rotary cutting, the debris is centrifugally discharged, and the chip removal performance is good. Three or more groups of circumferential blade ridges 21 and three or more groups of end blade ridges 22 are cut at the same time. The milling cutter has high cutting efficiency, the circumferential blade ridge 21 has a strong structure, a long service life, and the gradually expanding back cutting edge is conducive to chip removal.

[0040] Please refer to Figure 5 and Figure 6 The first structure of the end blade ridge 22 is that the end blade ridge 22 has a straight edge 221, a first back blade straight surface 222 and a second back blade fan surface 223 that are connected in sequence laterally. There is a straight chip groove 24 between each two adjacent groups of the end blade ridges 22. Four groups of straight chip grooves 24 are formed between four groups of end blade ridges 22. The straight edge 221 has high cutting efficiency. A further preferred structure of the end blade ridge 22 is that the inclination angle of the second back blade fan surface 223 is greater than the inclination angle of the first back blade straight surface 222. The inclination angle of the first back blade straight surface 222 is 3~14°, for example, the inclination angle of the first back blade straight surface 222 is 7°. The inclination angle of the second back blade fan surface 223 is 5~15°, for example, the inclination angle of the second back blade fan surface 223 is 11°. The inclination angle is the angle between the blade face and the cutting direction. Specifically, for the end blade ridge 22, the cutting direction is the tangent of the end face circumference perpendicular to the axial direction of the milling cutter. The inclination angle of the first flank straight surface 222 refers to the angle between the first flank straight surface 222 and the end surface perpendicular to the axial direction of the milling cutter; the inclination angle of the second flank fan surface 223 refers to the angle between the second flank fan surface 223 and the end surface perpendicular to the axial direction of the milling cutter. The milling cutter has a good chip removal effect, a solid and durable blade, low friction between the blade face and the cut surface, and high cutting efficiency.

[0041] Please refer to Figure 7 and Figure 8 It is further preferred that the straight edge 221 descends from the periphery to the center, that is, it is sunken toward the center. The angle θ between the straight edge 221 and the surface perpendicular to the axial direction of the shank portion 2 is 1-5°. For example, the angle θ between the straight edge 221 and the surface perpendicular to the axial direction of the shank portion 2 is 3°. The smaller the angle of the straight edge 221, the greater the resistance, and the better the quality of the machined surface. In contrast to the straight edge 221, the straight chip groove 24 rises from the periphery to the center, which is conducive to chip removal.

[0042] Please refer to Fig. 9 The second structure of the end edge ridge 22 is that the end edge ridge 22 has a circular arc edge 224. Between each two adjacent groups of the end edge ridges 22 is a curved chip removal groove 25. The circular arc edge 224 can mill various curved surfaces and circular arc grooves, and is suitable for semicircular edge milling.

[0043] In summary, the spiral blade MCD milling cutter of the present application has a spiral blade as the peripheral blade, and the milling cutting resistance is small. The design of the spiral blade and the spiral chip groove 23 is conducive to chip discharge, and the multi-blade design has high cutting efficiency.

[0044] The above are only some embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments. For ordinary technicians in this technical field, some improvements and modifications without departing from the creative design of the present application should also fall within the protection scope of the present application.

Claims

1. A spiral edge MCD milling cutter, characterized in that: It comprises a handle portion (1) and a shank portion (2) which are connected to each other; the shank portion (2) is made of MCD; The shank portion (2) comprises three or more groups of circumferential ridges (21) and three or more groups of end ridges (22); the number of groups of the circumferential ridges (21) and the number of groups of the end ridges (22) are the same; The circumferential blade ridge (21) is spiral-shaped, and comprises a spiral cutting edge (211), a first spiral flank face (212), and a second spiral flank face (213) which are connected in sequence laterally; a spiral chip removal groove (23) is provided between each two adjacent groups of the circumferential blade ridges (21); the spiral angle of the circumferential blade ridge (21) is 10-40°; the inclination angle of the first spiral flank face (212) is 3-11°; the inclination angle of the second spiral flank face (213) is 7-20°; and the inclination angle of the second spiral flank face (213) is greater than the inclination angle of the first spiral flank face (212).

2. The spiral edge MCD milling cutter according to claim 1, characterized in that: The helix angle of the circumferential blade ridge (21) is 30°; the inclination angle of the first helical flank surface (212) is 5°; and the inclination angle of the second helical flank surface (213) is 11°.

3. The spiral edge MCD milling cutter according to claim 1, characterized in that: The end blade ridge (22) comprises a straight edge (221), a first back blade straight surface (222) and a second back blade fan surface (223) which are connected in sequence laterally; a straight chip groove (24) is provided between each two adjacent groups of the end blade ridges (22).

4. The spiral edge MCD milling cutter according to claim 3, characterized in that: The inclination angle of the second back blade fan surface (223) is greater than the inclination angle of the first back blade straight surface (222); the inclination angle of the first back blade straight surface (222) is 3-14°; and the inclination angle of the second back blade fan surface (223) is 5-15°.

5. The spiral edge MCD milling cutter according to claim 4, characterized in that: The inclination angle of the first rear blade straight surface (222) is 7°; the inclination angle of the second rear blade fan surface (223) is 11°.

6. The spiral edge MCD milling cutter according to claim 3, characterized in that: The straight blade (221) descends from the periphery to the center; the included angle between the straight blade (221) and a surface perpendicular to the axial direction of the shank portion (2) is 1-5°.

7. The spiral edge MCD milling cutter according to claim 6, characterized in that: The included angle between the straight edge (221) and a surface perpendicular to the axial direction of the shank portion (2) is 3°.

8. The spiral edge MCD milling cutter according to claim 1 or 2, characterized in that: The end edge ridges (22) have arc edges (224); and between each two adjacent groups of the end edge ridges (22) is a curved chip removal groove (25).

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