On-line multi-stage waste heat quenching system

A waste heat quenching and cold water technology, applied in quenching devices, heat treatment equipment, manufacturing tools, etc., can solve problems such as residual stress hazards, corrosion resistance reduction, and cracking at the core of extruded materials, and achieve shape and dimensional stability, Improve the effect of waste heat quenching and avoid the effect of core cracking

Inactive Publication Date: 2016-06-29
有研科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Residual stress is very harmful. It can cause cracks in the core of the extruded material, shorten the service life of the part and reduce its corrosion resistance, and more seriously, it will change the shape and size of the extruded material.
In order to control the residual stress, at present, boiling water, air or other medium quenching are mainly used to reduce the cooling rate in an appropriate way

Method used

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  • On-line multi-stage waste heat quenching system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mg-8wt.%A1-0.4wt.%Zn magnesium alloy (abbreviated as AZ80) is a commonly used commercial magnesium alloy with a thermal conductivity of about 82W / (m K). It is produced by hot extrusion with a thickness of 290mm×230mm. In the process of cross-section extrusion, online quenching is required. The early use of online waste heat quenching guide is simple high-pressure water cooling, the water spray length is 3000mm, and the high-pressure water column is sprayed around the extruded material. The temperature is 400°C, the extrusion speed is 0.8mm / s, and the temperature of the extruded material is at room temperature after cooling through the quenching guide, but it is found that there is a crack in the center of the entire row material during subsequent sawing to length.

[0030] In the follow-up experiment, the quenching method was changed. After the extruded material was extruded from the die, the temperature entering the quenching system was still 400°C, and the speed was st...

Embodiment 2

[0034] Mg-5wt.%Zn-1wt.%Mn magnesium alloy (abbreviated as ZM51) is a deformable magnesium alloy with high thermal conductivity, and its thermal conductivity is about 120W / (m·K). In the process of producing ZM51 magnesium alloy square bar with a size of 290mm×230mm thick and large cross-section by extrusion method, a single water-cooled residual heat quenching guide is used for early cooling, the length of the water spray section is 5 meters, and the inner hole of the guide is circular, realizing 360° Spraying, the temperature before cooling is 380°C, the extrusion speed is 1.2mm / s, and the water temperature is room temperature after cooling. After later performance testing, it was found that the tensile strength of the surface of the ZM51 magnesium alloy extrusion material reached more than 350MPa, while the tensile strength of the core of the extrusion material was only 260MPa. performance gap is large.

[0035] Under the same extrusion temperature and post-extrusion speed c...

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Abstract

The invention discloses an on-line multi-stage waste heat quenching system. The on-line multi-stage waste heat quenching system comprises a path which is arranged in front of an outlet of an extruder and has a spraying function. The path is composed of an air spraying path body, a water spraying path body and a low-temperature cold water spraying path body sequentially or composed of an air spraying path body, a mist spraying path body, a water spraying path body and a low-temperature cold water spraying path body sequentially. By means of the on-line multi-stage waste heat quenching system, the quenching residual stress of extrusion materials, especially thick large-section extrusion materials, can be weakened, core cracking is avoided, and the waste heat quenching effect of the extrusion materials is improved to the maximum extent. Meanwhile, the performance of the core of the extrusion materials is improved, and the stability of the shape and size of finished products is realized.

Description

technical field [0001] The invention relates to an online multi-stage waste heat quenching system, which is used for increasing the hardening depth of extruded materials, especially thick and large cross-section extruded materials, and belongs to the technical field of high-temperature deformation heat treatment of metals. Background technique [0002] Quenching refers to a metal heat treatment process in which a metal workpiece is heated to an appropriate temperature and maintained for a period of time, and then immersed in a quenching medium for rapid cooling. Commonly used quenching media are brine, water, mineral oil, air, etc. Quenching critical cooling rate refers to the minimum cooling rate required for quenching. If it is lower than this cooling rate, the quenching effect cannot be achieved. Hardenability refers to the depth of the maximum hardened layer that can be obtained when the sample is quenched under the specified process conditions. Waste heat quenching re...

Claims

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Application Information

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IPC IPC(8): C21D1/667
Inventor 张奎李兴刚李永军袁家伟马鸣龙石国梁李婷
Owner 有研科技集团有限公司
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