提高压射冲头铸件质量及其寿命的措施研究

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Abstract：The injection punch is a ductile ironcomponent cast in sand mold，which is prone to defcts such as shrinkage，porosity，and porosity iside.After machining，the surface willexhibit aloose structure.Intheearlystage oftrial production of the product，the average service life of our branch company's product wasonlyhalf as hift（12 hours per shift）. After improving the moliding and melting process，the internal structure of the product is dense，and the rate of pualified products after machining is over 98% .At the same time， the induction hardening process on the outer surface of the product wasimproved，resulting inthe transformationof the matrix metallographic structure into flake-like martensite，and thesurface hardness was further improved，with a single piece service lifeof more than one shift.

Keywords：injection punch； casting process；melting formula； hardness

1序言

压射冲头是压铸机上的易损件，工作时其前端面与高温液态金属接触，外圆与压室内圆密封并产生摩擦直线运动，外圆磨损量达到一定程度后需要提前更换，因此压射冲头要有足够的力学性能及高温耐磨性能[1]。（剩余2459字）