Method for manufacturing hammer shaft of single-stage hammer crusher

Abstract

The invention discloses a method for manufacturing a hammer shaft of a single-stage hammer crusher. The method comprises the following steps of: a, selecting hot-rolled 48MnV round steel; b, performing normalizing treatment on the round steel at the temperature of between 930 and 940 DEG C, wherein the soaking time is 70 to 75 minutes; c, cooling the round steel by adopting wind cooling, controlling the cooling speed which is controlled to be between 30 and 40 DEG C per minute at the temperature of over 500 DEG C, and reducing the round steel to the room temperature through air cooling when the temperature is below 500 DEG C; d, performing cutting machine-shaping; and e, performing surface induction hardening and tempering. A great number of material tests summarize that the 48MnV is used as a raw material, and by implementing a great number of tests for summarization and a unique manufacturing process, the method, which is more economical and reasonable, for manufacturing the hammer shaft of the single-stage hammer crusher is obtained, and the method ensures that the mechanical properties of core parts and surfaces of components are more accordant, and the overall comprehensive performance of the components is better.

Description

technical field [0001] The invention relates to a manufacturing method of mechanical equipment, in particular to a manufacturing method of crusher parts. Background technique [0002] hammer shaft (see figure 1 ) is the main stress member on the single-stage hammer crusher, where L=914mm. All the hammers that crush the material are connected with it, and the rotation of the shaft drives the hammer to crush the material in a falling state. When working, the hammer shaft is subjected to a large radial impact force. [0003] Therefore, the hammer shaft has higher requirements on strength and impact toughness. Generally, medium carbon alloy steel is used to obtain comprehensive mechanical properties through quenching and tempering (quenching + tempering) heat treatment. Its performance requirements are as follows: [0004] Yield Strength N / mm 2 tensile strength N / mm 2 Elongation % Impact toughness J 540 735...

AI Technical Summary

Problems solved by technology

However, for parts with large cross-sections, due to the inability to harden through, the mechanical properties of the core and surface of the parts are inconsistent, which is manifested as poor overall performance of the parts.

In addition, during the quenching and tempering process, heat treatment defects such as deformation and cracking are prone to occur, the scrap rate is high, and energy consumption is large, polluting the environment, which does not meet the requirements of modern production for energy saving and environmental protection

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