1994年,我厂投资88万美元从美国购进一套由计算机控制气氛的热处理生产线,与之配套的有大量用于承架各种热处理零件的工装。这些工装长期使用在激冷(由950℃突然激冷到50℃)条件下,工装要求有较高的抗热疲劳及热冲击的能力。这些工装全部采用低碳、高铬镍合金钢制造,从美国购进每套需1800美元左右,为节约外汇,我们决定自制其工装。 1.铸件分析 精铸分厂负担的共有9种铸件,大部分单重在 In 1994, our factory invested 880,000 U.S. dollars to buy a heat treatment production line controlled by the computer from the United States. There is a large number of tooling for supporting various heat-treated parts. Long-term use of these tools in the chilling (sudden cooling from 950 ℃ to 50 ℃) conditions, tooling requirements have a higher resistance to thermal fatigue and thermal shocks. All of these tooling are made of low-carbon, high-chromium-nickel alloy steel and are purchased from the United States at about $ 1,800 each. To save foreign exchange, we have decided to make their own tooling. 1. Casting Analysis Casting Branch of the burden of a total of 9 kinds of castings, most of the single weight