精铸模料的膏状压注和固态压注——国外精铸技术进展述评(2)

Review of Progress in Investment Casting Technology at Abroad PartII: Paste Injection and Solid Rejection

由于模料液态压注存在体收缩率较大和制模周期长的缺点 ,自 2 0世纪 90年代以来 ,液态压注有“回归”到膏状压注的趋势。对于大型压蜡机 ,实现膏状压注的关键是设计制造性能稳定的膏状蜡制备和供给系统。固态压注技术近年已取得突破性进展 ,优点是模料体收缩率很小 ,蜡模无缩陷 ,压型设计。

The tendency of liquid injection returning to solid injection appears since the 1 990 s due to the demerits of a higher volume-contraction rate and long pattern-making period during liquid injection.Design of fabrication and supply system of paste wax with stable performance is a key factor in paste injection for large wax-presser.The solid injection realizing through-breaking progress in last years possesses the merits of a smaller volume-contraction rate,defects free wax pattern,simple design and manufacture of pressing mold.