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熔模铸造常用的压型有:机械加工的钢(铝)压型、易熔合金压型,塑料压型和石膏压型。机械加工的钢(铝)压型精度高,使用寿命长,但是制造困难,成本高,适用于大量生产。塑料压型多用于批量生产的零件,缺点是导热性差,生产效率低。石膏压型适用于单件试制生产。易熔合金压型是采用低熔点合金铸造制得。近些年来,易熔合金(锡铋合金)压型在国内外得到广泛应用。在熔模铸造生产中已充分表现出它的优越性,铸得的铸件已近于达到机械加工的钢(铝)压型所铸制的铸件精度水平。为普及推广少无切削新工艺之一一熔模铸造,不断改造与完善这一类压型具有重要的现实意义。本文试图在学习国内成果与个人实践的基础上,对锡铋合金压型的设计与制造论述如下,有不当之处,愿共同讨论研究提高。
Investment casting common pressure type are: machined steel (aluminum) pressure type, fusible alloy pressure type, plastic pressure type and gypsum pressure type. Machined steel (aluminum) pressure type high precision, long life, but difficult to manufacture, high cost, suitable for mass production. Plastic pressure type used for mass production of parts, the disadvantage is poor thermal conductivity, low productivity. Gypsum pressure type for a single trial production. Fusible alloy pressure type is made of low melting point alloy casting. In recent years, fusible alloy (tin bismuth alloy) pressure type is widely used at home and abroad. It has demonstrated its superiority in investment casting production, with castings nearly at the level of precision castings made from machined steel (aluminum) profiles. It is of great practical significance to popularize one of the few new cutting-free processes, that is, investment casting, and constantly reform and perfect this type of press. This article attempts to study the domestic achievements and personal practice on the basis of tin-bismuth alloy pressure on the design and manufacture of the following discussion, there are inadequacies, is willing to jointly discuss and improve.