Profiled roll heat treatment method with large requirement drop for roll body and roll neck

Abstract

The invention discloses a profiled roll heat treatment method with the large requirement drop for a roll body and a roll neck, and belongs to the field of metal heat treatment. The method comprises the steps that thermal refining is carried out according to hardness requirements of the roller neck at first, and the roll body is subjected to differential temperature treatment, wherein a ledge is wrapped by a protection sleeve before the roll body is subjected to differential temperature treatment. Product performance indexes are ensured, and product quality stability is improved.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a heat treatment method for grooved rolls. Background technique [0002] Section steel rolls are generally delivered with open holes, and the blanks are produced by forging steel ingots. In order to improve the hardness and wear resistance requirements of the pass parts, the pass is generally rough-machined before heat treatment. The pass is of different depths and shapes. The hardness requirements of the roll body and roll neck have a large drop, and it is difficult to ensure the hardness of the roll body and roll neck to meet the technical requirements at the same time through conventional heat treatment. [0003] At present, two methods can be used for the heat treatment production of rolls with large gaps in the hardness of the roll body and roll neck. The first is the overall heating method. Before loading the furnace, the roll neck is wrapped with fibers, and the whole ...

AI Technical Summary

Problems solved by technology

However, there are problems in the above method: 1. The hardness of the roll neck is not accurate and uniform, the overall heating and cooling tempering, the roll neck is wrapped with fibers to reduce the cooling speed, but the cooling speed of each part of the roll neck cannot be accurately controlled, and after heating, it is close to the The hardness of the main neck of the roll body is relatively high, while other parts are relatively low. In order to reduce potential safety hazards during use, local annealing is used to reduce the hardness of the roll neck, which increases the cost.

2. It is difficult to ensure the working layer at the bottom of the tank. During the differential temperature heating process, the temperature of the side of the tank is high and the holding time is long, the temperature of the bottom of the tank is low and the holding time is short, and the temperature of the side of the tank is too high when the holding time of the bottom of the tank is long , and the temperature difference is large, the groove side is prone to overburning or cracking

When the holding time of the bottom of the tank is short, the working layer will be thinner, which will affect the user's use

Images