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我厂制造的薄板工件,一般是小型冲模的压板或垫板,直徑50～400公厘,厚5～15公厘,材料是40号或(?)8碳鋼。热处理的时候,凡是直徑不到250公厘的,都用盐爐快速加热(温度为960～980℃)。技术条件要求热理后工件的硬度达到Rc35～40、Rc42～44或Rc50～54。一般地說,直徑同厚度的比在5:1以下时,工件处理后变形不大,超过了5:1,变形的程度就越来越大。为了减少变形,根据經驗,我們認为可以采用如下的热处理工艺: 一、加热工件用鉄絲吊着放在盐爐中快速加热到960～980℃。盐爐的爐膛有效尺寸为250×250×300公厘,变压器的容量为55千伏安。加热时
The thin-plate workpieces made by our factory are usually small-sized pressing plate or backing plate with diameter of 50 ~ 400 mm and thickness of 5 ~ 15 mm. The material is No. 40 or (?) 8 carbon steel. When the heat treatment, any diameter less than 250 mm, are rapidly heated with a salt furnace (temperature of 960 ~ 980 ℃). Technical requirements After the heat treatment of the workpiece hardness Rc35 ~ 40, Rc42 ~ 44 or Rc50 ~ 54. Generally speaking, when the ratio of diameter to thickness is below 5: 1, the deformation of the workpiece is not large after it is processed. When it exceeds 5: 1, the degree of deformation becomes larger and larger. In order to reduce the deformation, according to experience, we believe that the following heat treatment process can be used: First, the workpiece is heated with a screw hanging on the salt furnace quickly heated to 960 ~ 980 ℃. The hearth oven’s effective size is 250 x 250 x 300 mm and the transformer’s capacity is 55 kVA. When heated