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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

AI Technical Summary

Problems solved by technology

Therefore, the processing difficulty is large, and this problem has plagued the field for a long time, and no effective solution has been seen.

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

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Embodiment 1

[0022] In this embodiment, the aluminum alloy precision casting solidification defect control method, the casting is a cabin body, and the outline size is The wall thickness is 2.5mm, and the material is ZL114A aluminum-silicon series cast aluminum alloy. The investment gypsum type vacuum pressure casting process is adopted. The steps are as follows:

[0023] When pouring gypsum into the investment casting cabin wax model, a "U" type wax sample with a diameter of 30 mm is set in the mold, and the distance between the side wall of the "U" type wax sample and the mold cavity is 30 mm. After dewaxing at 200°C and high-temperature roasting at 700°C, the mold temperature is lowered to 300°C, and the "U"-shaped channel is filled with iron powder with a particle size of 40 mesh. Before the ZL114A melt is poured, the air pipe is firmly connected to the side of the "U" channel near the casting, and after the filling is completed under the vacuum condition of -0.05MPa, the nitrogen gas...

Embodiment 2

[0026] In this embodiment, the solidification defect control method of 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, and the material is ZL205A aluminum-copper cast aluminum alloy. The investment plaster type gravity casting process is adopted. The steps are as follows:

[0027] When pouring gypsum into the investment casting shell wax mold, a "U"-shaped wax sample with a diameter of 40mm is set in the mold, and the distance between the side wall 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 lowered 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 air pipe is firmly connected to the side of the "U" channel close to the casting. After the filling is completed under gravity, the air pipe is immediately fed w...

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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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