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我厂某产品冷挤压中的挤盂冲子,原设计为整体高速钢制成,每根冲子平均使用寿命为2～3万件,后改为工作部分用高速钢,非工作部分用35CrMnSi 钢两种材料对焊而成,其使用寿命平均可冲达11万件。整体高速钢冲子每根14kg,改用对焊后的冲于,只用高速钢1.84kg,每根可节约高速钢87%。正确地选择对焊焊缝位置和合适的热处理工艺,是提高冷挤冲子质量的关键。1.挤盂冲子对焊工艺该产品零件是由热轧碳素钢冷挤制成。在挤压过程中,挤盂冲子主要承受轴向压应力和弯曲应力。虽然冲子是用高速钢加工而成,但工作寿命不长。我们将冲子的结构尺寸和加工工艺进行了如下改进:见图1,①加大半径 R 尺寸,由原来 R10增大到 R20mm;
Cold extruding a product in our factory, the extruding puddle, originally designed for the overall high-speed steel, the average life of each punch is 2 to 30,000, later changed to work part of the high-speed steel, non-working part 35CrMnSi steel welded into two materials, the service life of up to an average of 11 million. The overall high-speed steel punch each 14kg, switch to the opposite after welding, only high-speed steel 1.84kg, 87% of each can save high-speed steel. Proper choice of butt weld location and the appropriate heat treatment process is to improve the quality of cold extrusion punch the key. 1. Extrusion puddle butt welding process parts of the product is cold-extruded from hot-rolled carbon steel. In the extrusion process, extrusion puncher mainly bear axial compressive stress and bending stress. Although the punch is made of high-speed steel, but the working life is not long. We will punch the structure size and processing technology were improved as follows: Figure 1, ① increase the radius R size, increased from the original R10 to R20mm;