Novel casting method and mould

Abstract

The invention discloses a novel casting method and a casting mould thereof. The method comprises the following steps: the casting mould is immersed in molten metal(8) for casting, an upper pressure device and a lower pressure device are driven to be pressurized by utilizing the lifting force and the gravity of the casting mould, the molten metal is subjected to cavity fill, compensation shrinkage, solidification and crystallization in a mould cavity(12) at the needed pressure, and the casting mould is immersed in water for chilling, thereby improving the mechanical property of a cast. The mould is characterized in that an upper mould(4) is provided with the upper pressure device, a lower mould(10) is provided with the lower pressure device, an upper and a lower pressure plugs(1 and 9) pressurize the molten metal in the mould cavity(12) from the upper part and the lower part of the casting mould respectively, and an upper and a lower compensation shrinkage cavities(5 and 13) replenish the molten metal to the cast for eliminating shrinkage cavity and dispersed shrinkage phenomena. The novel casting method and the casting mould thereof can be used to cast various complicated thin wall aluminum alloy casts such as a cylinder cover of an engine and wheel hub of a vehicle and large-sized thin wall aluminum alloy casts such as a cabin body of a large-sized cruise missile, quickly cast a cast aluminum rotor of a motor with high quality and replace the prior casting method in large scale.

Description

technical field [0001] The present invention relates to a new casting method and a casting mold using the method. Background technique [0002] The current casting methods include gravity casting, vibration casting, centrifugal casting, pressure casting, low pressure casting, differential pressure casting, liquid extrusion, reverse pressure casting, vacuum die casting, semi-solid casting, metal mold casting, squeeze casting, etc. Among them, gravity casting and vibratory casting have poor filling and feeding, easy to produce shrinkage porosity and shrinkage cavity, serious pressure casting pores, troublesome centrifugal casting operation, and other casting methods have great limitations in the scope of use. In comparison, In terms of casting quality and development, low-pressure casting is the first choice. According to "Special Casting and Non-ferrous Metals" in the fourth issue of 1998, the article "Prospects for Low-Pressure Casting Technology in the 21st Century" introd...

AI Technical Summary

Problems solved by technology

[0009] 1. Filling needs to go through the riser pipe, its flow is restricted, and the riser pipe will be lost;

[0010] 2. The pressurization method is to pressurize the outside of the casting mold through an external pressure source. The pressure is restricted by the bearing capacity of the crucible and cannot be raised to the pressure value required by the process;

[0011] 3. The effect of unidirectional pressurization and feeding is poor;

[0012] 4. The cooling method is restricted, the cooling speed is slow, and the productivity is not high;

[0013] 5. The yield rate of castings for automobiles and motorcycles such as wheels is low;

[0014] 6. A complete set of additional equipment such as a riser, a pressure source, and a low-pressure casting machine and a wide site are required, and the casting cost is high;

[0015] 7. In addition, the pouring conditions are relatively unstable during mass production, which affects the stability of product quality and yield, the productivity is not high, and the operation is troublesome

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