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由于冷挤压工艺通常受冲头强度的限制,被挤材料的强度一般不超过20钢。而在600～800℃进行半热挤压剂可降低毛坯材料的变形抗力,氧化和脱碳也都不明显,因而可用于大多数结构钢零件的生产。全苏电工技术生产工艺与设计研究院在半热挤工艺及其装置方面进行了一些工作。图1所示是装在水压机上使用的半热挤装置,它由模体、自动调节模区温度的控制台和全套置换零件组成。润滑有利于半热挤压工艺的顺利进行。曾试验过以下四类润滑材料:由重油提炼并加入石墨,二硫化钼等物质的油性润滑剂,用亚硫酸盐液或水玻璃作调料的石墨、二硫化钼悬浮液,玻璃润滑剂和
As the cold extrusion process is usually limited by the punch strength, the strength of the extruded material is generally not more than 20 steel. However, the semi-hot extrusion at 600 ~ 800 ℃ can reduce the deformation resistance of the blank material, oxidation and decarburization are also not obvious, which can be used for the production of most structural steel parts. All of the Soviet Union’s technology and production technology and Design Institute in the semi-hot extrusion process and its equipment for some work. Figure 1 shows a semi-hot extrusion unit for use on a hydraulic press. The unit consists of a die body, a console that automatically regulates the die temperature, and a complete set of replacement parts. Lubrication is conducive to the smooth progress of the semi-hot extrusion process. The following four types of lubricants have been tested: oily lubricants made from heavy oil and added with graphite, molybdenum disulfide and the like, graphite seasoned with sulfite or water glass, a suspension of molybdenum disulfide, a glass lubricant and