The use of metal treatment to control the quality of an aluminium casting produced by the High Pressure Diecasting process

摘要

The High Pressure Diecasting process is very attractive to the casting buyer, offering fast production rates coupled to optimised production costs. Over the past 10 years there has been considerable growth in the HPDC process and now highly stressed castings are being manufactured . As castings become more complex and some wall sections become heavier, so the advantage of the very rapid cooling rate is reduced and casting defects more commonly seen in gravity diecasting and sand casting are now being experienced in High Pressure Die Castings. The need to heat treat and weld castings also means that casting quality levels must be improved. Safety critical castings are being inspected by X-ray and particular mechanical properties are required from the casting itself. There is therefore the need to produce alloys of a higher quality level and metal cleanliness has become vitally important.