Testing method for temperature variation of tampering core part of forging piece for large-section bearing inner and outer rings

Abstract

The invention discloses a testing method for temperature variation of a tampering core part of a forging piece for large-section bearing inner and outer rings. The method comprises the following steps of: (1) punching a blind hole from the inner diameter of the forging piece for the bearing inner and outer rings to outside, wherein the depth of the blind hole is larger than or equal to 50% of thethickness of the section of the forging piece for the large-section bearing inner and outer rings; (2) adopting a flexible thermocouple, inserting a measuring end of the flexible thermocouple into the blind hole, and then filling the gap between the measuring end of the flexible thermocouple and the hole wall of the blind hole; and (3) connecting a cold end of the flexible thermocouple into a paperless recorder, arranging the forging piece for the bearing inner and outer rings into a tempering furnace for heating and insulation, then immersing the forging piece into watery quenching liquid for quenching and cooling, carrying out tempering treatment, recording real-time temperature variation data by the paperless recorder in the whole process and generating a curve chart about the temperature variation of the core part of the forging piece for the bearing inner and outer rings. The testing method is simple in step and wide in application range.

Description

technical field [0001] The invention relates to a test method for quenching and tempering temperature of a bearing product, more specifically, the invention mainly relates to a test method for temperature change of the quenching and tempering core of a large cross-section bearing inner and outer ring forging. Background technique [0002] With the implementation of my country's energy strategy, the country has paid more and more attention to large-scale equipment and wind turbines, and large-scale slewing rings, as their key components, play a decisive role in the reliability of their use. Due to the large cross-section of the large slewing bearing, it is difficult to completely harden it during the quenching and tempering process. In order to make the entire workpiece cross-section diathermy quenching and tempering process be implemented smoothly, too many heating and holding times are often set too conservatively, resulting in a huge waste of energy . Therefore, accurate ...

AI Technical Summary

Problems solved by technology

Due to the large cross-section of the large slewing bearing, it is difficult to completely harden it during the quenching and tempering process. In order to make the entire workpiece cross-section diathermy quenching and tempering process be implemented smoothly, too many heating and holding times are often set too conservatively, resulting in a huge waste of energy

Therefore, accurate measurement of the core temperature change during the heating and heat preservation process of large-section products is conducive to the establishment of a reasonable quenching and tempering process, while the existing large-section bearing products are still limited to cutting the product after quenching and tempering. The furnace sample is used to test the hardness gradient of the section to indirectly measure whether the core of the forging is diathermy. The sampling and testing cycle is long, and only the general situation can be known, and the exact temperature of the core cannot be known, especially the temperature change of the center during the quenching and cooling process. Whether the speed at which the workpiece is "cooled" is sufficient, so it is necessary to make further improvements against these defects

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