Slow injection and pressurization pressure-casting process

A process and pressure-increasing technology, which is applied in the field of slow-shot pressurized die-casting technology, can solve problems such as inability to guarantee production requirements, frequent mold sticking, and unsmooth production.

Inactive Publication Date: 2016-12-21
KINGPIN PRECISION IND SUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] 1) During the die-casting process, the production is not smooth and the sticking phenomenon is frequent, and normal operation cannot be guaranteed;
[0015] 2) There are many pores in the workpiece, and the level of pores exceeds level 3 (the standard is within level 3);
[0016] 3) A large number of air bubbles appear on the surface after T4 or T6 treatment, and the product scrap rate reaches 70% to 80%, which cannot guarantee the production requirements

Method used

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  • Slow injection and pressurization pressure-casting process

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Embodiment Construction

[0044] This embodiment provides a slow-shot pressurized die-casting process, which uses aluminum alloy 356.2 as a raw material to obtain an automobile brake system bracket through die-casting;

[0045] Die casting includes the following steps:

[0046] 1) Low-speed step: The molten aluminum in the melting cup is fed at a low speed by a punch to fill the cavity;

[0047] 2) Supercharging step: make the molten aluminum advance at a low speed to fill the cavity and solidify to start the supercharging pressure;

[0048] 3) Injection molding: Injection is completed with injection time twice that of traditional injection.

[0049] The traditional injection time of traditional die casting is generally 0.3s-0.5s.

[0050] The speed of the low speed is 0.2m / s.

[0051] Step 2) in boosting pressure (aluminum liquid withstand pressure) is 80Mpa.

[0052] Carry out T6 heat treatment on the car brake system bracket;

[0053] Correspondingly, T4 heat treatment can also be used instead ...

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Abstract

The invention discloses a slow injection and pressurization pressure-casting process. An automobile braking system support is obtained through carrying out pressure casting molding on aluminum alloy 356.2 serving as a raw material. Pressure casting comprises the following steps of 1) a low-speed step: completely carrying out pressure feeding on molten aluminum in a melting cup at low speed by using a punching head to fill a mold cavity; 2) a pressurization step: pushing the molten aluminum at low speed to fill the mold cavity, solidifying and starting a pressurization force; and 3) pressure injection molding: finishing pressure injection for a period of time which is at least two times as long as the time for traditional pressure injection. By using the slow injection and pressurization pressure-casting process, the normal and smooth production is ensured, and air holes inside workpieces are reduced to be within 3 levels; and meanwhile, the surface blistering rate of T4 or T6 thermal treatment is reduced to be within 5%.

Description

【Technical field】 [0001] The invention relates to product die-casting technology, in particular to the field of metal product die-casting technology. Specifically, it provides a slow-shot pressurized die-casting process. 【Background technique】 [0002] In the technical field of die-casting molding of metal products, due to their own material characteristics, the pass rate of die-casting products using the existing technology is low for some products, which cannot meet the production requirements. [0003] For example, in order to meet its performance, the bracket of automobile brake system is usually obtained by die-casting aluminum alloy 356.2. After heat treatment, aluminum alloy 356.2 castings can obtain the same strength and mechanical properties as steel parts, and at the same time, they are 2.9 lighter than steel parts. times. [0004] About aluminum alloy 356.2: [0005] 1) Its chemical composition: [0006] Regarding the chemical composition of aluminum alloy 356....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/00
CPCB22D18/00
Inventor 朱立群李凯田跃文袁顺志邵学明陆洋峰
Owner KINGPIN PRECISION IND SUZHOU CO LTD
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