Coated inserts for milling of compacted graphite iron
A technology of vermicular graphite cast iron and inserts, which is applied in the field of coated carbide cutting tool inserts, can solve problems such as inability to ensure the function of machine tools, achieve the effects of reducing the number, improving cutting performance, and increasing tool life
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example 1
[0033] A. According to the present invention, the model is TNEF 1204AN-KX cemented carbide grinding insert, the composition is 7.6wt% Co, 1.25wt% TaC, 0.30wt% NbC, the balance is WC, and the average grain size is 1.8 μm, after blasting to an edge radius of 35 μm, a binder phase alloyed with W (CW-ratio 0.9) was applied as follows:
[0034] The first layer, 0.5μm TiC 0.05 N 0.95 , in a known CVD method, using TiCl 4 , H 2 and N 2 The reaction mixture consisting of,
[0035] The second layer, 1.7μm columnar TiC 0.55 N 0.45 , using the known MTCVD technique at a temperature of 885–850 °C, and CH 3 CN as carbon / nitrogen source,
[0036] The third layer, 0.5μm TiC0.5 o 0.5 bonding layer, which has acicular grains,
[0037] A fourth layer comprising 2.7 μm α-Al formed using known CVD techniques 2 o 3 layer and finally a TiN top layer of approximately 1.3 μm. XRD measurements confirmed that Al 2 o 3 The layer is 100% alpha phase.
[0038] After the coating cycle, the ...
example 2
[0042] Carry out the following performance tests on blades A, B and C:
[0043] Operation: Surface Grinding - Coarse Grinding
[0044] Workpiece: top surface of diesel engine body
[0045] Material: CGI 85% pearlite and 23% nodularity
[0046] Tool: Sandvik Coromant R260.31-315
[0047] Standard: Surface finishing (burr formation)
[0048] cutting data
[0049] Cutting speed: Vc=200m / min
[0050] Feed rate / tooth: Fz=0.20mm / rotation
[0051] Cutting depth: Ap=4mm
[0052] dry conditions
[0053] Results: Tool Life Number of Engine Blocks
[0054] Grade A: (this invention) 874
[0055] Grade B: Sandvik GC 4020 695
[0056] Class C: ref. 456
example 3
[0058] Carry out the following performance tests on blades A, B and C:
[0059] Operation: Surface Grinding - Coarse Grinding
[0060] Workpiece: cylinder head
[0061] Material: CGI90% pearlite and 17% nodularity
[0062] Tool: Sandvik Coromant R260.31-250
[0063] Standard: Surface finishing (burr formation)
[0064] cutting data
[0065] Cutting speed: Vc=178m / min
[0066] Feed rate / tooth: Fz=0.18mm / revolution
[0067] Cutting depth: Ap=3.5mm
[0068] wet conditions
[0069] Blade Type: TNEF 1204AN-KX
[0070] Result: Tool life Number of cylinder heads
[0071] Grade A: (this invention) 748
[0072] Class B: Sandvik GC 4020 576
[0073] Class C: ref. 487
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