Water-soluble quenching medium for aluminum alloy precision part

A quenching medium, precision parts technology, applied in the direction of quenching agent, heat treatment equipment, manufacturing tools, etc., can solve the problems of large quenching residual stress, inability to take into account mechanical properties, small residual stress, etc., to achieve strong cooling capacity, reduce deformation and residual stress Stress, the effect of reducing residual stress

Inactive Publication Date: 2015-06-24
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water-soluble quenching medium for aluminum alloy precision parts to solve the problems of large quenching residual stress and mechanical properties of aluminum alloy precision parts, and ensure that the residual stress of aluminum alloy precision parts is small after quenching. And the mechanical properties can meet the requirements of use

Method used

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  • Water-soluble quenching medium for aluminum alloy precision part
  • Water-soluble quenching medium for aluminum alloy precision part
  • Water-soluble quenching medium for aluminum alloy precision part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Configure a water-soluble quenching medium with a concentration of 23% suitable for aluminum alloy precision parts with a thin thickness (<1.5mm). In terms of mass percentage, the amount of polyglycol (molecular weight 8000) is 22%, and the amount of preservative nitrite 0.85%, the amount of defoamer polyether modified silicon is 0.1%, the amount of sedimentation compound alkali is 500ppm, and the amount of tap water is 77%.

[0017] The performance and cooling characteristics of the configured 23% water-soluble quenching medium are shown in Table 1. Through the use of this quenching medium, the residual stress of aluminum alloy precision parts is significantly reduced,

[0018] And the mechanical properties meet the requirements of use, and there is no corrosion of the workpiece.

[0019] Table 1 Performance and cooling characteristics of the quenching medium in Example 1

[0020]

[0021]

Embodiment 2

[0023] Configure a water-soluble quenching medium with a concentration of 21% suitable for aluminum alloy precision parts with a medium thickness (1.5-4mm). In terms of mass percentage, the amount of polyglycol (molecular weight 8000) is 20%, and the amount of preservative nitrite 0.85%, the amount of defoamer polyether modified silicon is 0.1%, the amount of sedimentation compound alkali is 500ppm, and the amount of tap water is 79%.

[0024] The performance and cooling characteristics of the configured 21% water-soluble quenching medium are shown in Table 2. Through the use of the quenching medium, the residual stress of aluminum alloy precision parts is significantly reduced, and the mechanical properties meet the requirements for use, and no workpiece corrosion occurs.

[0025] Table 2 Performance and cooling characteristics of the quenching medium in Example 2

[0026]

Embodiment 3

[0028] Configure a water-soluble quenching medium with a concentration of 19.15% suitable for aluminum alloy precision parts with a thicker thickness (>4mm). In terms of mass percentage, the amount of polyglycol (molecular weight 8000) is 18%, and the amount of preservative nitrite is 18%. 1.0%, the amount of defoamer polyether modified silicon is 0.1%, the amount of sedimentation agent compound alkali is 500ppm, and the amount of tap water is 80.85%.

[0029] The performance and cooling characteristics of the configured 19.15% water-soluble quenching medium are shown in Table 3. Through the use of the quenching medium, the residual stress of aluminum alloy precision parts is significantly reduced, and the mechanical properties meet the requirements for use, and no workpiece corrosion occurs.

[0030] Table 3 Performance and cooling characteristics of the quenching medium in Example 3

[0031]

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Abstract

The invention discloses a water-soluble quenching medium for an aluminum alloy precision part and belongs to the metal heat treatment quenching agent technology. The water-soluble quenching medium comprises, by weight, 18-22% of polyalkylene glycol (with molecular weight of 8000), 0.6-1.0% of an antiseptic, a proper amount of an antifoaming agent and a settling agent, and the balance water. The water-soluble quenching medium has the advantages that 1, the problem that cold water as an aluminum alloy quenching medium has a fast cooling rate so that quenched residual stress is very large and the part can deform and crack is solved, and 2, it is solved that in hot water quenching, a cooling rate can be adjusted but quenching effects do not satisfy usage requirements. The water-soluble quenching medium can reduce an aluminum alloy initial cooling speed, has a strong cooling capability at a temperature of 440-250 DEG C, has good cooling characteristics and does not corrode a workpiece. The water-soluble quenching medium can reduce aluminum alloy part quenched residual stress, does not influence quenching effects and mechanical properties after aging and belongs to the field of metal heat treatment quenching agents.

Description

technical field [0001] The invention belongs to the technical field of quenching agents for metal heat treatment, and in particular relates to a water-soluble quenching medium used for aluminum alloy precision parts. Background technique [0002] In the heat treatment of aluminum alloys, water is generally used as the quenching medium. For aluminum alloy precision parts, if the water cooling speed is too fast, the parts will be seriously deformed and the quenching residual stress will increase, which will increase the workload and difficulty of calibration, making it difficult to guarantee the size of the parts. Parts are scrapped due to poor stability or even cracking during use. At present, hot water at 60°C-70°C is selected as the quenching medium for some aluminum alloys used in aviation. Although it can reduce the quenching residual stress of parts, it affects the quenching effect, resulting in a decrease in mechanical properties such as tensile strength after aging. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/60C22F1/04
CPCC22F1/002C22F1/04
Inventor 杨银闫晓东
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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