Carrier roller heat treatment technology

A kind of idler and process technology, which is applied in the field of the manufacturing process of the supporting parts of the mixing machine barrel device, can solve the problems of a large amount of oil fume, etc., and achieve the effects of preventing quenching cracks, facilitating material acquisition, and uniform hardness distribution

Inactive Publication Date: 2014-11-19
CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quenching oil used for oil quenching will produce a lot of oil fume after being heated, and the waste or regeneration of quenching oil weighing 100 tons or more in oil quenching of idlers will also bring many disadvantages to the cost of heat treatment of idlers and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The roller heat treatment process includes a quenching treatment step and a tempering step. The quenching step includes preheating, heat preservation and quenching processes for a formed roller whose blank material is 40Cr in sequence. The quenching is a phase of water cooling and air cooling. circulation cooling method;

[0016] The preheating step is to heat the roller to 630-650°C and keep it warm for not less than 5h;

[0017] The heat preservation step is to move the heated roller obtained in the above preheating step into a heating furnace with a furnace temperature higher than 870°C and heat it to 840-870°C for no less than 2 hours.

[0018] Specifically, the set preheating and heat preservation processes are two closely connected processes. The furnace temperature is set to be higher than the upper limit of the heating temperature of the roller, which can avoid serious oxidation and decarburization and coarse grains on the surface of the thicker roller. and the...

Embodiment 2

[0020] This embodiment is further limited on the basis of Embodiment 1: a further technical solution is: in order to balance the surface hardness obtained by quenching and the size of the accumulated quenching stress, so that the surface hardness of the idler roller is kept stable at about 50HRC, and The quenching stress is not enough to cause quenching cracks on the idler rollers, the temperature of the idler rollers in each water-cooling step in the quenching process is reduced to any value within the range of 60-80°C, and the temperature of the idler rollers in each air-cooling step is reduced to 15°C Any value within the range of -30°C. Further, in order to obtain an ideal tempering effect, the tempering temperature of the tempering is any value within the range of 580-620°C.

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PUM

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Abstract

The invention discloses a carrier roller heat treatment technology. The carrier roller heat treatment technology comprises a quenching treatment step and a tempering step. According to the quenching treatment step, preheating, heat preservation and shock cooling working procedures are sequentially carried out on a forming carrier roller with billet materials of 40 Cr, and the water cooling and air cooling interphase circulating cooling mode is adopted by shock cooling; according to the preheating step, the carrier roller is heated to 630 DEG C to 650 DEG C, and heat preservation is carried out on the carrier roller for five or more hours; according to the heat preservation step, the heat carrier roller obtained in the preheating step is moved into a heating furnace with the temperature higher than 870 DEG C to be heated to 840 DEG C to 870 DEG C, and heat preservation is carried out on the heat carrier roller for two or more hours. The process route is simple, the shock cooling mode that water cooling and air cooling are alternatively carried out is adopted, and under the condition that the heat treatment quality target is achieved, an existing adopted oil quenching shock cooling mode is replaced. Due to changes of the process, the quenching cost is saved, meanwhile, the dependency on oil quenching agents is reduced, and due to implementation of the process, environmental protection is benefited.

Description

technical field [0001] The invention relates to the field of manufacturing technology of support components of a mixer cylinder device, in particular to a heat treatment process of a carrier roller. Background technique [0002] The idler device is the supporting part of the barrel device of the mixer, which bears the weight of the entire barrel device and the materials in the barrel, as well as the dynamic load of the barrel device and materials during the working process. The above loads are mainly compressive stress and friction. It is required that the idler roller must have a certain strength, hardness and wear resistance. The quality of the idlers on the existing large-scale mixer exceeds 10T. Generally, a mixer is equipped with an idler at the inlet and the outlet. The manufacturing quality of the idler will directly affect the mixer roller, cylinder And the stress of various parts such as the rolling ring directly affects the service life of the above-mentioned comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/38
Inventor 吴光武
Owner CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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