在机械制造行业中,一些原材料要经过退火后才能转入机械加工工序。为了防止工件的氧化、脱碳,传统的退火方法是用木炭或铁屑把工件埋起来,再用黄泥或石棉泥封好,工件在电阻炉中加热或者在盐浴保护下加热。尽管采用了种种措施,仍常常伴有氧化、脱碳。这样,设计人员就要为机械加 In the machinery manufacturing industry, some of the raw materials are annealed before they can be transferred to the machining process. In order to prevent the oxidation and decarbonization of the workpiece, the traditional annealing method is to embed the workpiece with charcoal or iron filings, and then sealed with yellow mud or asbestos mud. The workpiece is heated in a resistance furnace or heated under salt bath protection. Despite all the measures taken, oxidation and decarburization are often accompanied. In this way, the designer must be mechanical plus