A die-casting extrusion mechanism and method

Abstract

The invention discloses a die casting extrusion mechanism which comprises a die, an extrusion pin and a drive device, wherein the die is provided with a through hole allowing the extrusion pin to penetrate through, and the through hole communicates with a die cavity of the die and the external; the extrusion pin is in a cylinder shape and is composed of a first end part and a second end part opposite to the first end part, and the cross section shape of the through hole is matched with that of the extrusion pin; and the drive device is connected with the second end part of the extrusion pin to drive the extrusion pin to carry out axial reciprocating movement between the original position and the extrusion position; wherein when the extrusion pin is in the original position, the end surface of the first end part flushes with the inner wall, adjacent to the through hole, of the die cavity; and when the extrusion pin is in the extrusion position, the first end part penetrates through the through hole and enters the die cavity. The die casting extrusion mechanism can ensure the organization structure at the periphery of a die casting hole to be dense, effectively prevents the defect of a shrinkage cavity and lowers the porosity. The invention also discloses a die casting extrusion method.

Description

technical field [0001] The invention relates to the technical field of die casting, in particular to a die casting extrusion mechanism and method. Background technique [0002] Die casting is a method of filling the mold cavity with liquid metal at a high speed under high pressure, forming and solidifying under pressure to obtain castings. Compared with other casting processes, the die-casting process can cast more precise elongated holes, which generally can be used directly without further processing or with only a small amount of processing. Therefore, die-casting technology is more and more widely used in fields such as automobile production. For example, figure 1 The steering gear housing 100 shown can be made of aluminum alloy by die-casting. According to the traditional process, the process hole 110 on the steering gear housing 100 usually uses a core to form a die-casting hole. However, on the one hand, the core is surrounded by high-temperature liquid metal duri...

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Problems solved by technology

However, on the one hand, the core is surrounded by high-temperature liquid metal during die-casting, and it is subjected to strong thermal action and the tightness and shearing force formed by the solidification and shrinkage of the liquid metal, which can easily lead to bending or breaking of the core, affecting the shape of the mold. core life

On the other hand, because the die-casting hole of some die-casting parts is located far away from the gate, it is difficult to transmit the pressure at the gate to the die-casting hole, which easily leads to the local thick wall of the die-casting hole, loose structure and high porosity. , poor internal quality and other defects, affecting product strength and reducing the pass rate of products

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