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Carrier roller processing technique conducive to reducing heat treatment defects

A processing technology and idler technology, which is applied in the manufacturing process of the supporting parts of the mixer cylinder device, can solve a large amount of oil fumes and other problems, and achieve the effects of saving quenching costs, reducing dependence, and simple process routes

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

[0017] The idler processing technology that is beneficial to reduce heat treatment defects includes a quenching treatment step and a tempering step. The quenching step includes preheating, heat preservation and quenching processes for a formed idler roller whose material is 40Cr in sequence. The preheating step The heating step is to heat the roller to 630-650°C and keep it warm for not less than 5 hours;

[0018] The heat preservation step is to move the hot 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;

[0019] The quenching is a circulating cooling mode of water cooling and air cooling. After each circulating cooling mode is completed, tempering is carried out once. In the quenching process, the temperature of the idlers in each water cooling step is reduced to any temperature within the range of 60-80°C. Value, the temperature of the idler in each air-cooli...

Embodiment 2

[0023] This embodiment is further limited on the basis of Embodiment 1: in order to improve heat treatment efficiency, the slow cooling is furnace cooling.

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Abstract

The invention discloses a carrier roller processing technique conducive to reducing heat treatment defects. The carrier roller processing technique comprises a quenching step and a tempering step, wherein the quenching step comprises the procedures of preheating, heat preservation and shock cooling; in the preheating procedure, a carrier roller is heated to 630-650 DEG C, and heat preservation lasts for no fewer than 5 h; in the heat preservation procedure, the hot carrier roller obtained in the preheating procedure is transferred into a heating furnace at the temperature above 870 DEG C to be heated to 840-870 DEG C, and heat preservation lasts for no fewer than 2 h; the shock cooling is water-cooling and air-cooling alternated circulating cooling, and tempering is performed once after each circulating cooling procedure. According to the technique, water cooling and air cooling are performed alternately to replace conventional oil-quenching shock cooling under the condition of achieving heat treatment quality objectives; such a change in the technique not only reduces the quenching cost, but also reduces the dependence on oil quenching agents. Besides, the implementation of the technique is favorable for environment protection and the route of the technique is favorable for uniformity of heat treatment hardness on the surface and the depth of the carrier roller.

Description

technical field [0001] The invention relates to the field of manufacturing technology for supporting parts of a mixer barrel device, in particular to a processing technology for idler rollers that is beneficial to reducing heat treatment defects. 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 affe...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/38
Inventor 吴光武
Owner CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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