Craft for improving dimensional stability of die castings

A technology for dimensional stability and die casting, which is applied in the technological field of improving the dimensional stability of die castings, can solve the problems of long processing time, energy waste, low efficiency, etc. black effect

Inactive Publication Date: 2020-11-06
DONGFENG SHIYAN NONFERROUS CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the processing time of these several processes is long and the efficiency is low, which has become the bottleneck of the process, requiring repeated heating and cooling, resulting in a great waste of energy, and the actual effects of different heat treatment processes vary greatly

Method used

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  • Craft for improving dimensional stability of die castings
  • Craft for improving dimensional stability of die castings
  • Craft for improving dimensional stability of die castings

Examples

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Embodiment 1

[0029] like figure 1 As shown, this embodiment discloses a process for improving the dimensional stability of die castings, comprising the following steps:

[0030] S1. Remaining temperature quenching: After the die-casting mold is opened, the temperature of the casting is kept at 280-320 ° C. Put the casting into water to eliminate the residual casting stress inside the casting. After the temperature of the casting drops to 80-100 ° C, the water is released and compressed air is used. Blow dry the casting;

[0031] S2. Natural aging: place the casting at room temperature for ≥24 hours;

[0032] S3. Artificial aging: keep the castings warm, the temperature range is 200-240°C, and the holding time is 2-4h;

[0033] S4, air cooling, and then machining.

[0034] Aging treatment, also known as low temperature tempering, includes natural aging and artificial aging. The traditional artificial aging heats the casting to 175-185°C, and the holding time is 5-24h. This process signi...

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Abstract

The invention provides a craft for improving dimensional stability of die castings. The craft comprises the following steps of lingering warmth quenching: maintaining the temperature of castings from280 to 320 DEG C after die sinking, putting the castings in the water to remove the casting stress left inside the castings, taking the castings out of the water after the temperature of the castingsis reduced to 80 to 100 DEG C, and using compressed air to dry the castings; natural aging: placing the castings in the room temperature for greater than or equal to 24 hours; and artificial aging: keeping the temperature of the castings from 200-240 DEG C for 2-4 hours. The craft uses lingering warmth quenching to release the residual stress in the die castings, thereby improving the dimensionalstability of the die castings and obviously reducing the processing time of artificial aging.

Description

technical field [0001] The invention belongs to the technical field of die casting, and in particular relates to a process for improving the dimensional stability of die castings. Background technique [0002] Die casting is a metal casting process characterized by applying high pressure to the molten metal using the cavity of the mold. The casting has excellent dimensional accuracy and the surface of the casting is smooth. However, aluminum alloy die castings will suffer from dimensional instability. The dimensional instability of die castings is caused by the existence of residual stress and unstable structure. The commonly used dimensional stabilization treatment processes include natural aging, artificial aging, cold treatment and cyclic heat treatment. It is to eliminate residual stress, stabilize the alloy structure, and improve the dimensional stability of components. [0003] At present, the processing time of these several processes is long and the efficiency is lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/002C22F1/04
Inventor 支刚峰钱运亮徐燕杨召岭高维刚
Owner DONGFENG SHIYAN NONFERROUS CASTING
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