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Coated inserts for milling
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A milling and coating technology, applied in the field of carbide milling inserts
Inactive Publication Date: 2007-12-19
SANDVIK INTELLECTUAL PROPERTY AB
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Additionally, milling cutting edges often creates comb-like cracks
Method used
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Embodiment 1
[0037] Embodiment 1 (the present invention)
[0038] In machines of models R245-12T3M-KM, R290-12T308M-KM and SPKN1204EDR, powders were pressed into cemented carbide milling blanks, the composition of the powders being: 7.6wt% Co, 1.25wt% TaC, 0.30wt% NbC and the balance of WC, followed by sintering the milling body at 1410°C using a common process, the Hc value of the sintered insert is 14.7kA / m, and the magnetic Co content is 6.85wt%, Equivalent to a CW ratio of 0.90. The insert is chamfered with a cutting edge with a radius of 35 μm by wet sandblasting, and then coated with the first TiC layer with a thickness of 0.5 μm x N y layer, which has a high nitrogen content corresponding to a y value of approximately 0.95, and is then coated with a second TiC layer with a thickness of 6 μm x N y Layer, using MTCVD method (temperature is 850-885 ℃, and CH 3 CN is used as carbon / nitrogen source), the value of x is about 0.55, and has a columnar crystal structure. In subsequent st...
Embodiment 2
[0040] Embodiment 2 (prior art)
[0041] The insert described in Example 1 has the same type, and the cemented carbide milling cutter described in Table 1 is made by existing technology.
[0042] Table 1
[0043]
Embodiment 3
[0045] The insert according to Example 1 of the present invention was tested by milling the end face of a cylinder block head of highly alloyed gray cast iron.
[0046] Tool: R245-12T3M-KM
[0047] The number of blades in the cutting machine: 24pcs
[0055] Measured: the service life of the tool of sample A is 174 cylinder heads, and the blade of the present invention is 215.
[0056] Result: the service life of the blade of the invention is increased by 23%, and it has good surface gloss.
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Abstract
The present invention discloses coated cemented carbide milling inserts, particularly useful for rough and semifinishing milling of grey cast iron, highly alloyed grey cast iron, compacted graphite iron (CGI) with or without cast skin under dry conditions. The inserts are characterised by a WC-Co cemented carbide with a low content of cubic carbides and a W-alloyed binder phase and a coating including an inner layer of TIC x N y with columnar grains followed by a wet blasted layer of ±-Al 2 O 3 . on the rake face and coloured top layer on the clearance side. The invention also relates to a method of making cutting tool inserts according to the above.
Description
technical field [0001] The invention relates to a coated cemented carbide milling insert particularly suitable for rough machining of gray cast iron, highly alloyed gray cast iron, vermicular graphite cast iron (CGI) with or without cast skin in a dry environment Or semi-finishing milling. Background technique [0002] When carbidecutting inserts are used in the machining of cast iron, the cutting edges are worn due to different wear principles, such as chemical wear and wear volume. In addition, milling cutting edges often creates comb-shaped cracks. Comb-shaped cracks are formed perpendicular to the cutting edge and are the result of cyclic and thermal loads. When the comb-shaped cracks extend to a certain depth in the cemented carbide body, the blade begins to chip and fracture. [0003] A distinctive feature of cast iron components is that the structure of their hard surface areas deviates considerably from their overall structure. Its surface area usually contains ...
Claims
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Application Information
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