The thick-walled seamless pipe cold extrusion technology has the following advantages:
1. Extrusion parts size accurate surface smoothness: At present, the cold extrusion parts developed in China generally have a dimensional accuracy of 8 to 9 grades. If the ideal lubrication is used, the precision is second only to the fine polished surface. Therefore, parts manufactured by the cold extrusion method generally do not need to be reworked, and a small amount only needs to be finished (grinding).
2. Saving raw materials: The material utilization rate of cold extrusion parts can usually reach more than 80%. For example, the utilization rate of the piston machining material of the Jiefang brand automobile piston is 43.3%, and the material utilization rate is increased to 92% when the cold extrusion is used; and if the universal joint bearing sleeve is changed to cold extrusion, the material utilization rate is from the past. 27.8% increased to 64%. It can be seen that the production of mechanical parts by cold extrusion can save a lot of steel and non-ferrous materials.
3. High productivity: The efficiency of producing mechanical parts by cold extrusion method is very high, especially in the production of large-volume parts, which can be several times, several times, or even several hundred times more efficiently produced by cold extrusion. For example, the cold extrusion method for automotive piston pins is 3.2 times higher than that for cutting, and the cold extrusion piston pin robot is currently used to further increase productivity. The productivity of a cold extrusion automaton is equivalent to the productivity of 100 ordinary lathes or 10 four-axis automatic lathes.
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