Die-casting die capable of preventing die expansion

Abstract

The invention discloses a die-casting die capable of preventing die expansion, and relates to the field of die casting. The die-casting die comprises a base, an extrusion opening is formed in the base, the extrusion opening is connected with an injection molding device, an upper die is fixedly arranged on the lower side of the base, and guide rails are fixedly arranged on the left side and the right side of the base. According to the die-casting die, through an exhaust mechanism main body arranged in the parting surface, accumulated gas in all directions is detected, then the accumulated gas is exhausted, meanwhile, the airtightness of the gas in the direction is not affected, so that the effect of completely exhausting residual gas is achieved, the purpose of avoiding damage caused by die expansion due to air pressure rise caused by unsmooth exhaust of the device and accumulation of the residual gas is achieved, a lifting plate descends through a threaded shaft, so that a gas hole is in communication with the forming space through a through hole, then most of gas in the forming space is extracted through the gas extraction effect of an extraction pump, the effect of reducing the resistance of molten liquid flowing into the forming space is achieved, and the purpose of preventing die expansion is achieved.

Description

technical field [0001] The invention relates to the field of die-casting, in particular to a die-casting mold for preventing die expansion. Background technique [0002] Before the plastic melt fills the mold, the mold cavity is filled with air, and the plastic melt will also generate a lot of gas during the injection process. In an ideal state, all these gases will be driven out of the mold cavity, but in actual production, due to energy loss during the flow of the plastic melt, the temperature will decrease, resulting in poor fluidity, and due to the head-on obstruction of the compressed gas , the consequences are nothing more than the following two aspects: First, the melt is not enough to break through the compressed air barrier, and is forced to stop moving forward, resulting in product shortage or burnt products; second, the melt breaks through the compressed air barrier, but due to excessive pressure Bulge. [0003] Mold expansion is mainly caused by poor exhaust. O...

AI Technical Summary

Problems solved by technology

In an ideal state, all these gases will be driven out of the mold cavity, but in actual production, due to energy loss during the flow of the plastic melt, the temperature will decrease, resulting in poor fluidity, and due to the head-on obstruction of the compressed gas , the consequences are nothing more than the following two aspects: First, the melt is not enough to break through the compressed air barrier, and is forced to stop moving forward, resulting in product shortage or burnt products; second, the melt breaks through the compressed air barrier, but due to excessive pressure Expansion

[0003] Mold bulging is mainly caused by poor exhaust. Once bulging occurs, it is easy to cause mold deformation and cause injection molded parts to fail to meet the requirements, resulting in a large number of scrapped injection molded parts. At the same time, the mold needs to be replaced, resulting in a lot of waste and a serious reduction in production efficiency.

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