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在拉深1Cr18Ni9Ti零件(见图1、图2)时,往往在工件的拉深和胀形部分发生破断,并产生严重的伤痕。用粉状石墨搅拌在机油中来润滑,也不能解决问题。经分析:板料在拉深时,接触凸模端部转角处(见图3A处)的材料承受凸模给予的全部的力,并由此传递到工件变形区。如果拉深变形所需的总压力超过材料的强度极限,工件就会在A部周围发生破裂。1Cr18Ni9Ti是奥氏体不锈钢,在冷作变形过程中,加工硬化的程度比低碳钢大得多,如果用硬化指数n表示材料加工硬化的特性,低碳钢n=0.19～0.22,不锈钢则为0.5。因此,不锈钢拉深时,硬化显著,在变
When deep drawing 1Cr18Ni9Ti parts (see Figure 1, Figure 2), often in the parts of the drawing and bulging part of the fracture occurred, and produce serious injuries. Stirring with powdered graphite in the oil to lubricate, it can not solve the problem. It is analyzed that when the sheet is drawn, the material that contacts the corners of the end of the punch (see FIG. 3A) is subjected to the full force imparted by the punch and is thereby transferred to the workpiece deformation zone. If the total pressure required to stretch the deformation exceeds the material’s strength limit, the workpiece will rupture around the A section. 1Cr18Ni9Ti austenitic stainless steel, cold deformation in the process hardening extent much lower than the low-carbon steel, if the hardening index n said material hardening properties, low carbon steel n = 0.19 ~ 0.22, stainless steel is 0.5. Therefore, when stainless steel is drawn, the hardening is remarkable and changing