Method and system for adjusting temperature of extruding and casting pressure chamber

Abstract

The invention discloses a method and a system for adjusting temperature of an extruding and casting pressure chamber. The method comprises the following steps that heat-conduction oil that flows along a heat-conduction oil passage arranged in the wall of the extruding and casting pressure chamber carries out heat exchange with the pressure chamber and the molten metal in the pressure chamber; and the temperature required by the pressure chamber and the molten metal is controlled by adjusting the temperature and the flow of the heat-conduction oil. The system for realizing the adjusting method is characterized in that the pressure chamber is formed by assembling an external sleeve pipe wall and an internal sleeve pipe wall; the internal wall of the external sleeve and the external wall of the internal sleeve are respectively provided with corresponding heat-conduction oil passages; after being assembled, the heat-conduction oil passages that are uniformly distributed in the pressure chamber wall are formed; and the oil inlet and the oil outlet are exposed at the lower end of the pressure chamber. In the invention, the pressure chamber can be heated uniformly; the heat of the heat-conduction oil is sufficiently utilized; the heat exchange efficiency of the pressure chamber is improved; the relative stability of the fitting clearance between the punching head and the extruding and casting pressure chamber wall can be kept; excessive friction and abrasion between the pressure chamber wall and the punching head can be avoided; the motion of the punching head is improved; and the service life of the extruding and casting pressure chamber and the punching head can be prolonged.

Description

technical field [0001] The invention relates to squeeze casting equipment, in particular to a method and system for adjusting the temperature of a squeeze casting pressure chamber. Background technique [0002] Squeeze casting is a process that applies high mechanical pressure to the liquid metal in the cavity of the mold to shape and solidify it, thereby obtaining a casting. The injection system of the squeeze casting equipment is mainly composed of a pressure chamber and a punch. The injection system provides the pressure required from the molten metal filling the mold to the complete solidification process. In the injection process, generally the molten metal is poured into the pressure chamber first, and then the punch moves upward to fill the cavity of the mold with the molten metal to complete the filling process. [0003] During the filling process, the temperature of the pressure chamber has an important influence on the quality of the casting and the normal operati...

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Problems solved by technology

[0005] (1) It can only be heated passively, and the temperature of the pressure chamber cannot be actively controlled. The equipment has limited ability to intervene in the control of the pressure chamber, and it is difficult to meet the requirements of the process for the temperature of the injection system. The temperature of the injection system will always fluctuate. Thermal stress still accompanies the entire production process

[0006] (2) The electric heating tube is wound around the outside of the press chamber. The electric heating tube first heats the outer wall of the press chamber before transferring heat to various parts of the press chamber. This heating method itself causes uneven heating inside and outside the press chamber, and It also affects the speed of heat transfer and reduces the efficiency of heat transfer

[0007] (3) The uppermost part of the pressure chamber should match the mold, and there is no space to arrange electric heating tubes, so that the heating can only be carried out in the lower part of the pressure chamber, and the upper and lower parts of the pressure chamber are heated unevenly, causing the pressure chamber to be subjected to additional pressure Thermal stress affects the fit between the press chamber and the punch, and also reduces the service life of the press chamber

[0008] (4) The electric heating tube is in contact with the wall of the pressure chamber. Once the electric heating tube leaks, it will cause the overall short circuit of the extrusion casting equipment, causing safety hazards

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