Quenching device for support roller path part of oversized excavator and quenching process

Abstract

The invention belongs to the technical field of metal process quenching, and relates to a quenching device for a support roller path part of an oversized excavator and a quenching process. The device comprises a vertical induction quenching machine tool, a supporting wheel support roller path quenching water spraying device and a supporting wheel support roller path induction quenching heating tool. The process comprises the following steps: fixedly placing a workpiece in the induction quenching machine tool, heating the workpiece at a frequency of 300 to 600Hz by virtue of the supporting wheel support roller path induction quenching heating tool, and spraying water to a the support roller path part of the heated supporting wheel for quenching by taking clear water as a cooling medium by virtue of the supporting wheel support roller path quenching water spraying device. According to the device and the system, a deep induction heating link for quenching treatment of the support roller path part of a supporting wheel of the excavator and an adjacent shaft shoulder surface can be implemented, energy resources can be saved, and the working efficiency can be improved.

Description

technical field [0001] The invention relates to a quenching device and a technology for a supporting raceway part of an extra-large excavator, belonging to the technical field of metal quenching. Background technique [0002] Large excavators are indispensable advanced loading tools for open-pit mining operations, and the rollers are one of the large-scale consumable spare parts for mines. Excavator rollers are an important part of the excavator transmission system. It is responsible for carrying the static load or dynamic load of the excavator. Since the condition of the excavator changes greatly during use, the magnitude and direction of the load borne by the roller raceway is also constantly changing. For example, when the excavator starts or stops on the uneven working surface, because the excavator itself is very heavy, it will generate a lot of friction with the track shoes; it will also receive a lot of impact during repeated excavation. In this way, fatigue pittin...

AI Technical Summary

Problems solved by technology

[0008] The overall heat treatment and quenching stress is large, easy to cause cracking, low surface hardness, poor hardness uniformity, shallow hardened layer, high energy consumption and other disadvantages

Cooling with an aqueous solution containing 10% NaOH (or 10% NaCl) is relatively expensive and not environmentally friendly

[0009] 1-10kHz intermediate frequency or 100kHz high-frequency induction heating is used for quenching. Although the energy consumption is low and the surface hardness is high, for large workpieces such as rollers, 1-10kHz intermediate frequency or 100kHz high-frequency induction heating is used, because the skin effect is more obvious. , so the hardened layer obtained under the condition of ensuring a good structure is shallow, about 3-5mm

In addition, this method has a steep hardness gradient in the transition zone, which is prone to peeling off blocks during use

This method uses an aqueous solution containing 8-10% PAG for cooling, and the cost is high, and the addition of PAG is not environmentally friendly.

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