板材送进夹钳装置设计(工作原理+任务书+说明书+CAD图纸+英文参考文献) 第2页
Table 3-1 Chemical composition of ASTM4140 steel used in the test
Cutting inserts ISO Designation Substrate Grade Company
Uncoated
cemented
Carbide VBMT 160408 ......... KC 313 Kennametal
TiAlN VBMT 160408 KC313 KC5010 Kennametal
TiN-TiCN-TiN VBMT 160408 KC313 KC732 Kennametal
Table 3-2 Types of the tested cutting inserts
Carbon Manganese Phosphorus Sulfur Silicon Nickel Chromium
0.4 0.91 0.017 0.02 0.24 0.10 1.01
Tin
0.008 Aluminum
0.030 Vanadium
0.002 Calcium
0.0064 Molly
0.2 Copper
0.12
Table 3-3 Coatings properties
Coating Thickness Number of layers
TiALN 3.5 µ 1
TiN-TiCN-TiN 3 µ-3 t-1 t 3
(TiCN intermediate)
3.2.2 Coolant Properties
It is a common belief that coolant emulsion helps in reducing wear rate and cutting temperature. The coolant used in the test was water based emulsion has commercial name`Novick'. It is mixed with water at a concentration of 10%. The coolant composition includes the listed chemicals in Table 3.5. Previous researchers on the better coolant stream directions made different suggestions. Taylor [17] indicated that to reduce tool wear the cutting fluid is to be directed at the back of the chip (direction A). Pigott and Colwell [47] found that by using high stream jet of coolant aimed in direction B it was able to reduce tool wear. Smart and Trent [48] investigated the direction of coolant in reducing the tool wear and found that the most effective direction between all other suggested options was direction B. Therefore, coolant was applied in direction B as listed in Figure 3.4 from a nozzle with diameter of 1.3 cm and a flow rate of 7.1 liters/minute. However, the current study showed that this is not necessarily true in all cases as coolant extends the tool life. It was found that coolant emulsion helped reduce tool life by activating certain wear mechanism at high speed machining (HSM). Detailed explanations of this type of coolant effect will be discussed in Chapter 5. Further more, a brief summary and explanation of types and usage of coolant will be covered in Chapter 5.
Table 3-4 Assembled cutting tool geometry
Tool geometry Dimension
Nose radius 0.8 (mm)
Bake rake angle 0 °
End relief angle 5'
End cutting-edge angle 52°
Side cutting-edge angle 30
Side rake angle 0'
Side relief angle 5'
Table 3-5 Coolant chemical compositions
Sulfate20-30% Aromatic alcohol
3-5% Propylene glycol ether3-5%Petroleum oil
30-35% Nonionic surfactant3-5% Chlorinated alkene polymer20-30%
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