Manufacturing method of powder metallurgy cam

A manufacturing method of a powder metallurgy cam is disclosed. Material composition contains, by weight, 0.2-1.5% of carbon, 0-4% of copper, 0-2% of nickel, 0-11% of molybdenum, 0-18% of chromium, 0-12% of tungsten, 0-10% of vanadium, no more than 2% of unavoidable impurities and the rest of iron....

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Bibliographische Detailangaben
Hauptverfasser: MAO ZENGGUANG, ZHAN XUEJIU, BAO CHONGXI, CAI LISHAN
Format: Patent
Sprache:eng
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Zusammenfassung:A manufacturing method of a powder metallurgy cam is disclosed. Material composition contains, by weight, 0.2-1.5% of carbon, 0-4% of copper, 0-2% of nickel, 0-11% of molybdenum, 0-18% of chromium, 0-12% of tungsten, 0-10% of vanadium, no more than 2% of unavoidable impurities and the rest of iron. The preparation method comprises the following steps: mixing the above raw materials to obtain a mixed powder, and adding 0.1-1 wt% of a lubricant; compacting the mixture into a cam green body with its density being 6.25-7.4 g/cm ; sintering the cam green body at 1000-1350 DEG C for 5-180 min; annealing the cam green body in a nonoxidizing atmosphere at the annealing temperature of 750-1080 DEG C and keeping warm for 5-200 min; extruding through an extrusion moulding machine or a press converted from a finishing press with the extrusion deformation degree being greater than 2% in the diameter direction; and carrying out heat treatment and processing so as to obtain a finished product. The manufacturing process is simple. The prepared cam has high precision and good surface finish. By the manufacturing method, production cost is reduced and production efficiency is enhanced. In comparison with a traditional powder metallurgy process, the manufacturing process of the invention has advantages as follows: density of the product is higher, and surface densification is basically realized.