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Pressure adjustable casting method and crucible therefor

A crucible and casting mold technology, applied in the field of special casting, can solve the problems of difficulty in sealing the lower sealing chamber, limited feeding capacity of castings, low pressure holding pressure, etc., and achieves the effect of simple structure, fine structure and improved solidification pressure.

Inactive Publication Date: 2007-01-17
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problems solved by the present invention: in the existing pressure regulating casting method, the holding pressure is small, the casting feeding capacity is limited, and the sealing of the lower sealing chamber is difficult, and the technical problems of large pressure regulating space

Method used

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  • Pressure adjustable casting method and crucible therefor
  • Pressure adjustable casting method and crucible therefor
  • Pressure adjustable casting method and crucible therefor

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Embodiment Construction

[0019] A crucible for pressure regulating casting, the crucible includes a crucible body 2 and a water-cooled flange 33 . The water-cooling flange is welded on the upper end of the crucible body, and the heat-insulating asbestos groove 34 and the rubber sealing ring groove 35 are arranged on the upper surface of the water-cooling flange 33. A cavity is provided inside the water-cooling flange for cooling of circulating water. A water inlet port 39 and a water outlet port 40 for circulating water are arranged on the outer edge, and the crucible gas path interface 5 is arranged on the upper part of the crucible body 2 .

[0020] The material of the crucible body 2 is 1Cr18Ni9Ti, and the material of the water-cooled flange 33 is A3; 2 Water filling pressure without leakage.

[0021] The gas path interface 5 of the crucible is welded by a seamless steel pipe and a flange, and the other end of the seamless steel pipe is welded with the crucible body 2, and the material of the seam...

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Abstract

A pressure-adjustable casting method includes such steps as putting casting mould and molten metal respectively in upper sealed chamber and crucible, vacuumizing them, filling inertial gas or compressed air in the crucible, pressing the molten metal in mould cavity along the flow-up tube under the action of adjustable pressure difference, vacuumizing the vacuum hood while adjusting the pressure in crucible to quickly change it from negative pressure to positive one, solidifying the cast workpiece, and releasing the pressure. Said crucible for adjusting pressure is composed of crucible body, water cooling flange, and pressure adjusting pipe interface.

Description

technical field [0001] The invention belongs to the field of special casting, and in particular relates to a casting mold suitable for various aluminum alloy materials and various materials, especially suitable for a vacuum air conditioner suitable for aluminum-based composite materials with large and complex structures that are difficult to form and resin sand molds with large gas generation. Die casting technology. Background technique [0002] In the patent document CN 1034876A, a pressure regulating casting method is disclosed. The method is to press the liquid metal into the cavity along the anti-gravity direction under a certain vacuum degree. After the filling is completed, the filling pressure difference is kept constant At the same time, the pressure of the upper and lower sealed chambers is increased under certain conditions, so that the solidification environment of the casting changes rapidly from negative pressure to positive pressure. This method changes the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/06F27B14/10
Inventor 韩建民沙镇嵩李卫京陈怀君李荣华崔世海徐向阳刘元富王金华
Owner BEIJING JIAOTONG UNIV
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