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A cryogenic treatment method for cast aluminum alloy piston parts

A technology of casting aluminum alloy and cryogenic treatment, which is applied in the field of heat treatment technology, can solve the problems of long aging time, decrease in tensile strength and hardness at aging temperature, etc., and achieve the effects of performance improvement, volume stability and performance stability.

Inactive Publication Date: 2015-08-19
SANMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too long aging time and too high aging temperature will cause the decrease of tensile strength and hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, a cryogenic treatment method for a cast aluminum alloy piston part, comprising the following steps:

[0018] (1) Suspend the cast aluminum alloy piston on the liquid nitrogen surface of the cryogenic treatment device, or place it in a low-temperature environment with a temperature of -130°C for slow cooling for 20 minutes;

[0019] (2) Dip the cast aluminum alloy piston parts into liquid nitrogen for liquid cryogenic treatment, the liquid nitrogen temperature is -196°C; the immersion time of the piston parts in liquid nitrogen is 6 hours;

[0020] (3) Take the cast aluminum alloy piston directly out of the liquid nitrogen and place it in the environment of a programmable temperature-controlling heating device with an initial temperature of -130°C and slowly warm it up for 20 minutes, then put it in the air and warm it up to room temperature Carry out slow warming treatment;

[0021] (4) Place the cast aluminum alloy piston in a muffle furnace with a set c...

Embodiment 2

[0026] Embodiment 2, a cryogenic treatment method for a cast aluminum alloy piston part, comprising the following steps:

[0027] (1) Suspend the cast aluminum alloy piston on the liquid nitrogen surface of the cryogenic treatment device, or place it in a low-temperature environment with a temperature of -120°C for slow cooling for 25 minutes;

[0028] (2) Dip the cast aluminum alloy piston parts into liquid nitrogen for liquid cryogenic treatment, the liquid nitrogen temperature is -188°C; the immersion time of the piston parts in liquid nitrogen is 7 hours;

[0029] (3) Take the cast aluminum alloy piston directly out of the liquid nitrogen and place it in the environment of a programmable temperature heating device with an initial temperature of -120°C and slowly return to the temperature for 25 minutes, and then return to room temperature in the air Carry out slow warming treatment;

[0030] (4) Place the cast aluminum alloy piston in a muffle furnace with a set control t...

Embodiment 3

[0035] Embodiment 3, a cryogenic treatment method for a cast aluminum alloy piston part, comprising the following steps:

[0036] (1) Suspend the cast aluminum alloy piston on the liquid nitrogen liquid surface of the cryogenic treatment device, or place it in a low temperature environment with a temperature of -110°C and slowly cool it for 30 minutes;

[0037] (2) Dip the cast aluminum alloy piston parts into liquid nitrogen for liquid cryogenic treatment, the liquid nitrogen temperature is -180°C; the immersion time of the piston parts in liquid nitrogen is 8 hours;

[0038] (3) Take the cast aluminum alloy piston directly out of the liquid nitrogen and place it in the environment of a programmable temperature heating device with an initial temperature of -110°C and slowly warm it up for 30 minutes, then put it in the air and warm it up to room temperature Carry out slow warming treatment;

[0039] (4) Place the cast aluminum alloy piston in a muffle furnace with a set cont...

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PUM

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Abstract

The invention discloses a subzero treatment method for a cast aluminium alloy piston component. The subzero treatment method for the cast aluminium alloy piston component comprises the following steps: (1) suspending a piston component above a liquid nitrogen liquid level or placing the piston component in an environment at the temperature ranging from -130 DEG C to -110 DEG C, slowly cooling the piston component for 20-30 minutes; (2) immersing the piston component into liquid nitrogen and carrying out liquid process subzero treatment on the piston component for 6-8 hours at the temperature ranging from -196 DEG C to -180 DEG C; (3) placing the piston component in a heating device the temperature of which is controlled by a program, and slowly heating the piston component for 20-30 minutes, wherein an initial temperature of the heating device ranges from -130 DEG C to -110 DEG C, and heating time is determined according to the size of the piston component; (4) placing the piston component into a muff furnace the temperature of which is controlled to be 200 DEG C, heating the piston component to a set temperature and insulating for 4-6 hours, taking out the piston component, and carrying out natural cooling until the piston component is at room temperature; (5) repeating the steps for 2-3 times. By adopting the subzero treatment method for the cast aluminium alloy piston component, volume stability and mechanical property of the casting aluminium alloy piston component are greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of heat treatment technology and relates to a cryogenic treatment method for aluminum alloys, in particular to a cryogenic treatment method for cast aluminum alloy piston parts for improving the volume stability and performance of cast aluminum alloy piston parts. Background technique [0002] Cast aluminum alloys are widely used for their good mechanical properties, physical properties and machinability. Due to its good high temperature performance, ZL108 alloy is mainly used to manufacture parts that work at higher temperatures, such as pistons. For the piston, the stability of the volume directly affects its performance and service life. [0003] In the prior art, in order to improve the volume stability of the cast aluminum alloy piston part, the vibration aging process technology is generally adopted. At present, there is no literature report on the use of cryogenic treatment technology to improve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04
Inventor 晋芳伟吴龙熊昌炯魏剑闻霞
Owner SANMING UNIV
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