Two-stage quenching heat treatment process method of crusher combined hammer head and special device thereof

Abstract

The invention relates to a heat treatment technology of an abrasion-resistant material, and particularly relates to a two-stage quenching heat treatment process method of a crusher combined hammer head and a special device thereof. The two-stage quenching heat treatment process method comprises the following steps of: orderly hanging hammer heads with the same spacing on the special device; uniformly charging into a furnace, heating to 900-1050 DEG C, keeping temperature for 2-6 hours, and then fast placing into an oil groove which contains quenching oil with 2-5 times hammer head weight sum (small batch) or hammer head weight and special device weight sum (large batch) for oil quenching; when the surface temperature of the head parts of the hammer heads enters the temperature interval of Ms-500 DEG C, taking out and air-cooling to room temperature; and carrying out medium and low temperature tempering at 200-500 DEG C so that the hardness of the head part material high-chromium cast iron of the crusher combined hammer head more than 60 HRC (Rockwell hardness). The two-stage quenching heat treatment process method disclosed by the invention successfully solves the technical problems of cracking, extremely low air-cooling hardness, and the like of the traditional oil quenching in the actual production of the crusher combined hammer head by dint of the special heat treatment device, adopting an oil cooling-air-cooling two-stage quenching method and controlling the weight proportion of a quenching medium and a workpiece.

Description

technical field [0001] The invention relates to a heat treatment technology for wear-resistant materials, in particular to a double-stage quenching heat treatment process method and a special device for a composite hammer head of a crusher. Background technique [0002] With the continuous improvement of my country's industrial level, the application fields of wear-resistant materials are very extensive, and the consumption is increasing. According to statistics, in 2009 my country's abrasive wear conditions consumed more than 3.5 million tons of wear-resistant steel castings. Moreover, it is currently growing rapidly at an average annual growth rate of 5%-10% (Li Wei. Development of China's Foundry Wear-Resistant Materials. Casting, 2012, 9:967-984). [0003] The hammer head of the crusher is the key wear-resistant part of the hammer crusher for finely crushing mineral raw materials. According to its working characteristics, the head of the crusher hammer must have high w...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the size of the round hole of the hammer handle, the string rod is relatively thin and easy to bend, causing the hammer head to gather in the middle, which affects the quenching and cooling effect

In addition, after the heat treatment of the composite hammer head, the rod stringing is more complicated and takes a long time, which makes it difficult to control the quenching temperature

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