提高壓射沖頭鑄件質(zhì)量及其壽命的措施研究

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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

壓射沖頭是壓鑄機(jī)上的易損件，工作時(shí)其前端面與高溫液態(tài)金屬接觸，外圓與壓室內(nèi)圓密封并產(chǎn)生摩擦直線運(yùn)動(dòng)，外圓磨損量達(dá)到一定程度后需要提前更換，因此壓射沖頭要有足夠的力學(xué)性能及高溫耐磨性能[1]。（剩余2459字）