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

Inactive Publication Date: 2008-05-28
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, if the reliability of the machine tool is considered, it will be understood that if the machine tool is used in dry conditions, then the machine tool builder will not be able to ensure the functionality of the machine tool due to the high temperature, chips, dust, etc. that will be generated by the dry machining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The present invention discloses coated milling inserts particularly useful for milling of compacted graphite iron under wet conditions at moderate cutting speeds comprising a cemented carbide body and a coating. The cemented carbide body comprises WC, 7.3-7.9 wt-% Co and 1.0-1.8 wt-% cubic carbides of Ta and Nb and a highly W-alloyed binder phase. The radius of the uncoated cutting edge is 25-45 µm. The coating comprises - a first <1 µm TiC x N y O z layer adjacent to the cemented carbide having a composition of x+y=1, x>= 0, - a second 1-2 µm TiC x N y O z layer having a composition of x>0.4, y>0.4 and 0=<z<0.1 - a third <1 µm TiC x N y O z layer having a composition of x+y+z>=1 and z>0 - an ±-Al 2 O 3 -layer with a thickness of 2.1-3.3 µm and - a further 0.1-2.5 µm, thick layer of TiN missing along the edge line.

Description

technical field [0001] The present invention relates to coated carbide cutting tool inserts that are particularly useful for grinding compacted graphite iron (CGI) at moderate to high cutting speeds under dry and wet conditions. Background technique [0002] For environmental reasons, compacted graphite iron (CGI), also sometimes referred to as vermicular graphite iron, is becoming an increasingly favorable material in engine manufacturing. With CGI having 75% higher tensile strength and about 45% greater hardness than alloyed gray cast iron, CGI is especially suitable for complex parts subject to mechanical and / or thermal loads, such as in diesel engine blocks and cylinder heads, In these locations, cleaner emissions require higher internal operating pressures. CGI allows for the development of lighter and stronger cylinder blocks and cylinder heads. [0003] In engine design, a recent trend in the development of CGI engines is to increase energy density. What fabricator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B33/00B32B9/00B24D3/00B24B1/00B24B3/00C22C29/02C23C16/00
CPCC23C28/04C23C28/00B23B2228/10C23C28/042C23C28/044B23B2224/32B23B2222/14C23C30/005Y10T428/12576Y10T407/235C23C16/30B23B27/148C23C16/32C23C16/34C23C16/36C23C16/403
Inventor 埃曼努埃尔·戴维英厄马尔·赫斯曼
Owner SANDVIK INTELLECTUAL PROPERTY AB
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