Aluminum alloy precise casting solidification defect control method

A precision casting and control method technology, applied in the field of aluminum alloy casting, can solve problems such as difficult processing and no solution, and achieve the effects of increasing solidification speed, suppressing loose defects, and increasing cooling speed

Active Publication Date: 2018-04-10
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the processing difficulty is large, and this problem has pla

Method used

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  • Aluminum alloy precise casting solidification defect control method
  • Aluminum alloy precise casting solidification defect control method
  • Aluminum alloy precise casting solidification defect control method

Examples

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Example Embodiment

[0021] Example 1

[0022] In this embodiment, the method for controlling solidification defects in aluminum alloy precision casting, the castings are cabins, and the outline dimensions are The wall thickness is 2.5mm, the material is ZL114A aluminum-silicon cast aluminum alloy, and the investment plaster type vacuum pressure casting process is adopted. The steps are as follows:

[0023] When casting the gypsum with the wax model of the investment casting cabin, a "U" wax pattern with a diameter of 30mm is set in the mold, and the distance between the sidewall of the "U" wax pattern and the mold cavity is 30mm. After dewaxing at 200°C and firing at 700°C, the mold temperature is reduced to 300°C, and the "U"-shaped channel is filled with iron powder. The particle size of the iron powder is 40 mesh. Before casting the ZL114A melt, connect the vent pipe firmly to the side of the upper plane of the "U"-shaped channel close to the casting. After filling the mold under -0.05MPa vacuum, ...

Example Embodiment

[0025] Example 2

[0026] In this embodiment, the method for controlling solidification defects in aluminum alloy precision casting, the casting is a shell type, and the outline size is The wall thickness of the main body is 3.0mm, the material is ZL205A aluminum-copper cast aluminum alloy, and the investment plaster type gravity casting process is adopted. The steps are as follows:

[0027] When the investment casting shell wax pattern is poured into plaster, a "U"-shaped wax sample with a diameter of 40mm is set in the mold, and the distance between the sidewall of the "U"-shaped wax sample and the mold cavity is 20mm. After dewaxing at 200°C and high-temperature roasting at 700°C, the mold temperature is reduced to 250°C, and the "U"-shaped channel is filled with chromite sand with a particle size of 20 mesh. Before the ZL205A melt is poured, the vent pipe is firmly connected to the side of the "U"-shaped channel on the plane close to the casting. After the filling is completed...

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Abstract

The invention provides an aluminum alloy precise casting solidification defect control method. A U-shaped channel is arranged in a casting mold, and gas is introduced into the U-shaped channel. By means of the aluminum alloy precise casting solidification defect control method, the solidification speed of investment pattern plaster mold aluminum alloy melt can be increased, grains are refined, theloosening defect is inhibited, and the mechanical performance of a casting body is improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to the control of solidification defects in aluminum alloy casting. Background technique [0002] Cast aluminum alloy is a typical cast light alloy with low density, high plasticity, and excellent electrical and thermal properties. Aluminum alloy precision castings are widely used in aerospace, weapons, automobiles and other fields. With the lightweight development of weapons and equipment, automobiles and other fields, a large number of aluminum alloy castings are designed as thin-walled structures. In order to realize the complete filling of thin-walled castings, the investment plaster casting process is generally used, and the plaster mold temperature is generally 200 during pouring. ~300°C, or even higher. Due to the good thermal insulation performance of the gypsum mold, the low thermal conductivity, and the slow solidification speed of the aluminum ...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22D27/04
CPCB22C9/04B22D27/04
Inventor 陶健全陈强赵高瞻黄志伟万元元李明赵祖德
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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