Reason Analysis Causing Cutting Property Difference of Cylinder Block Casting
In order to find out the reason causing that,under the same cutting conditions and when cutting the same place of the cylinder block castings from different producers,the cutting tool life difference being about 1 times,the same place of the top surface of two cylinder blocks was sampled for chemical composition analysis,metallographic structure analysis,and the morphology and composition analysis of the inclusions,the reason causing difference cutting property was found out and proposed the corresponding improvement measures as follows:(1)To reduce the adding amount of Cr,strictly control the amount of Ti and V in raw materials to avoid the formation of hard points accelerating tool wear.(2)To rationally design inoculation treatment process to prevent production of D type,E type graphite,and,as well as supercooled ferrite matrix.(3)Appropriately increase Mn and S contents to prevent producing MnS and TiC symbiotic inclusion and thereby to worsen cutting property.
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维普
