Keywords PCD, milling cutter | 2020-02-26 09: 58: 26 | Industrial patent
Abstract Abstract: The utility model discloses an extended PCD spiral edge end mill, which includes a tool holder. Two blade slots are evenly distributed in the circumferential direction of the front end of the tool holder. A PCD composite blade is welded in each blade slot. The PCD composite insert is provided with a cutting edge, which is characterized by ...
Abstract: The utility model discloses an extended PCD spiral edge end mill, which includes a tool holder, and two blade slots are evenly distributed in the circumferential direction of the front end of the tool holder. A PCD composite blade is welded in each blade slot. The PCD composite insert is provided with a cutting edge, characterized in that the axial rake angle γP of the cutting edge is 5 to 10 °, the rake angle γo of the orthogonal section is 0 to 11 °, and the rake angle αO of the orthogonal section is 4 to 10 °, end-edge bevel angle ψ is 0.1 ～ 2 °, tool nose arc radius R is 0.1 ～ 0.6mm; actual helix angle βe is calculated from cutting edge diameter ￠, machine tool grinding rotation angle θ and blade length L2, The specific formula is as follows: βe = tg‑1 (πdθ / L2 × 360 °). The beneficial effects of the utility model are: in the working conditions of processing the large side and the bottom surface, the processing quality is good, the tool life is long, the tool changing time is reduced, the production efficiency is high, the processing quality is stable, and the production cost is significantly reduced.
Abstract:
Applicant: Shanghai Yuhe Diamond Tools Co., Ltd.
Applicant:
Address: 201314 Xinchang, Pudong New District, Shanghai (Hidden)
Inventor (designer): Nie Fengyao
Technical field
[0001] The utility model belongs to the field of end mills, and in particular relates to an extended PCD spiral edge end mill.
Background technique
[0002] Large sizes (generally ≥20mm, some of them are often encountered in modern manufacturing fields such as aerospace, automotive, medical equipment, instrumentation, optoelectronics, computers, sensors, precision machinery, radar, optics, molds, communications, etc. 40 ~ 45mm) cutting of the side and bottom surface, and the requirements on the roughness of the side and bottom surface are high, especially in GFRP, CFRP, MMC, FRM (SiC / AL), titanium alloy, aluminum alloy, titanium aluminum alloy It is very difficult to process such difficult materials.
[0003] Currently, conventional coated hard alloy end mills are commonly used to process large sides and bottom surfaces. The main disadvantages are fast wear, short life, poor accuracy, low efficiency, and high cost.
[0004] The PCD material is a polycrystalline diamond material that forms diamond microcrystals under high temperature (1560 ° C) and high pressure (16GPa). It is bonded and sintered by metal Co, Ni and other materials. The hardness can reach HV6000 ~ 8000, heat resistance. It can reach about 700 ～ 800 ℃, and the cutting speed allowed on the machining center is 3-10 times higher than that of cemented carbide. The cutting of non-metal and non-ferrous metal difficult-to-machine composite materials is relatively slow compared with that of cemented carbide end mills. Many, the durability of the tool can be increased by 5 to 10 times. However, since the shape of PCD pressing and sintering is a disk, the diameter is generally about 60 to 80 mm, and the rake surface is flat. It is difficult to make a spiral surface because of its high hardness.
Utility model content
[0005] In order to overcome the above-mentioned problems in the prior art, an object of the present invention is to provide an extended PCD spiral-edge end mill.
[0006] In order to achieve the purpose of the present invention, the technical solutions adopted are:
[0007] An elongated PCD spiral-edged end mill includes a shank, and two blade slots are evenly distributed in the circumferential direction of the front end of the shank, and a PCD composite blade is welded in each blade slot. On the PCD composite blade, A cutting edge is provided, characterized in that the axial rake angle γP of the cutting edge is 5 to 10 °, the rake angle γo of the orthogonal section is 0 to 11 °, and the rake angle αO of the orthogonal section is 4 to 10 °. The bevel angle ψ of the blade is 0.1 to 2 °, and the radius R of the tool tip arc is 0.1 to 0.6 mm. The actual helix angle βe is calculated from the cutting edge diameter ￠, the turning angle θ of the machine tool and the blade length L2. The specific formula is as follows: βe = tg-1 (πdθ / L2 × 360 °).
[0008] In a preferred embodiment of the present invention, a chip discharge groove is provided at the rear end of each blade groove.
[0009] In a preferred embodiment of the present invention, the structure of the shank includes any one of a straight shank, a Morse taper shank, a 7:24 taper shank, and a HSK 1:10 short taper hollow shank.
[0010] In a preferred embodiment of the present invention, the material of the holder includes any one of 42CrMo, 36CrMoTi, and K10 to K20 hard alloys.
[0011] In a preferred embodiment of the present invention, Ra of the tool holder is ≦ 0.4 μm, and the cylindricity is ≦ 2˜3 μm.
[0012] In a preferred embodiment of the present invention, the PCD composite insert is a 25 μm coarse grain, a 10 μm medium grain, or a 2 μm fine grain PCD composite insert.
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