Quenching apparatus used for excavator supporting wheel shaft head and shaft neck portion

Abstract

The invention relates to a quenching apparatus used for an excavator supporting wheel shaft head and shaft neck portion, and belongs to the technical field of metal quenching. The apparatus comprises an intermediate-frequency induction quenching machine tool, a supporting wheel shaft portion and end quenching water spraying quenching mechanism, a supporting wheel shaft portion and end induction quenching heater, a water cooler, a water storage tank and a control bench. A workpiece is put in the intermediate-frequency induction quenching machine tool, is well fixed, and is heated at 300-600 Hz by using the supporting wheel shaft portion and end induction quenching heater, and the heated supporting wheel shaft neck and end portion of the workpiece undergoes water spraying quenching by the supporting wheel shaft portion and end quenching water spraying quenching mechanism with clear water as a cooling medium.

Description

technical field [0001] The invention relates to a quenching device used for the shaft head and journal of the supporting wheel of an excavator, and belongs 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. The supporting roller includes a supporting raceway part and a shaft head part. The supporting raceway part acts on the track plate. The sliding bearing and the bearing seat installed on the shaft head part fix the supporting roller on the frame of the excavator through the bearing seat. The roller body rotates to work. [0003] The roller shaft head and the sliding bearing in the bearing seat form a pair of friction pairs. It...

AI Technical Summary

Problems solved by technology

[0007] 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

[0008] 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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