Manufacturing method of casting cold heading mold

Abstract

A cast cold-heading mold is prepared from chemical components as follows: 0.6%-1.0% of C, 0.8%-1.2% of Si, 0.7%-1.0% of Mn, less than or equal to 0.03% of P, less than or equal to 0.03% of S, 4.5%-5.5% of Cr, 1.0%-1.5% of Mo, 0.7%-1.2% of V, 1.0%-1.3% of Ni and 0.5%-1.0% of Cu. Smelting is performed with a medium-frequency induction furnace, after deoxidizing and slag removal, molten steel is poured into a precoated sand cold-heading mold cast, and a part blank of the cast cold-heading mold is obtained; the blank is subjected to strengthening and toughening treatment and then subjected to surface hardening treatment, and surface gas nitriding treatment is performed on the cast cold-heading mold after machining. Compared with a manufacturing method for a forged cold-heading mold, a manufacturing method for the cast cold-heading mold has the advantages that the service life of the mold is prolonged, manufacturing procedures are simplified, the workload is reduced, the cost is reduced, the material utilization rate is increased, steel for the mold is reduced, and a lot of loss of raw materials during cutting machining and forging heating is reduced.

Description

technical field [0001] The invention belongs to the field of manufacturing methods of cold working dies, especially casting cold heading dies. Background technique [0002] Cold heading is one of the methods for efficiently producing fasteners, so cold heading dies are widely used in the fastener industry. The cold heading die has to bear a large unit pressure during the cold heading deformation process, especially when the degree of deformation is large and the material strength is high, the unit pressure it bears is greater, and the flow of metal is very intense at the same time. Therefore, in order to meet the characteristics of high productivity, automation, and mass production of fasteners, the cold heading die must have a corresponding service life in order to exert the highest performance of the cold heading process. However, for a long time, cold heading dies have been made of forging die steel (such as Cr12, Cr12MoV, etc.). Due to the loose structure of forging mod...

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Problems solved by technology

The defect of anisotropy in mechanical properties of forged module steel ingots is difficult to eliminate by normal heat treatment methods

It has been reported in the literature that vacuum heat treatment and other high-tech methods can improve the anisotropy of mechanical properties of forged modular steel ingots, thereby improving the service life of forging cold heading dies, but this method requires large investment, complicated processes, and high costs. hard to promote

[0003] As mentioned above, current cold heading dies generally have problems such as short service life, complicated manufacturing process, long manufacturing cycle and high manufacturing cost in the fastener industry.

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