Injection device of cold-chamber die casting machine

Abstract

The invention discloses a filling device of a cold-chamber die casting machine composed of direction valves V2, V5 and V7 and cartridge valves V1, V4 and V6 as well as a pressure sensor V3, wherein a spring chamber of the cartridge valve V1 is connected to a T port or a P port of the direction valve V2, the spring chamber of the cartridge valve V4 is connected to the T port or P port of the direction valve V5, the spring chamber of the cartridge valve V6 is connected to the T port or P port of the direction valve V7; when the direction valves are electrified to control the starting of the cartridge valves, an oil flowing direction of the spring chamber of the cartridge valves is in accordance with the thrust direction of an electromagnet, so that the oil passing capacity of the direction valves reaches the highest level, and can more rapidly open the cartridge valves, thereby quickening the time from a slow speed to a rapid speed during a filling process, shortening a pressure building time for increasing pressure and filling, and improving key performances of the cold-chamber die casting machine in the filling system. The invention has good effect for the die casting product requiring high speed and short injection time, such as magnesium alloy die castings, thin-walled die castings, die-castings of complex shapes and the like.

Description

technical field [0001] The patent of the present invention relates to a cold chamber die-casting machine injection device, especially a cold chamber die-casting machine injection device that requires high-speed injection, rapid pressure build-up, and rapid injection and pressurized injection in a short period of time. Background technique [0002] A good cold chamber die-casting machine must have high injection performance, so that it can be used in a wider range and the qualified rate of die-casting products is higher; while the injection system of most existing domestic cold chamber die-casting machines , in the application field that requires high-speed die-casting, it cannot show high performance. Its shortcomings are mainly as follows: 1. The injection speed is not fast enough. For many die-casting products, due to its short rapid injection stroke, Often the injection has ended, but the injection speed has not risen to the maximum speed it can reach. When the metal liqu...

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Problems solved by technology

[0002] A good cold-chamber die-casting machine must have high injection performance, so that it can be used in a wider range and the pass rate of die-casting products is higher; while the injection system of most existing domestic cold-chamber die-casting machines , in the application field that requires high-speed die-casting, it cannot show high performance. Its shortcomings are mainly as follows: 1. The injection speed is not fast enough. For many die-casting products, due to its short rapid injection stroke, Often the injection has ended, but the injection speed has not risen to the maximum speed it can reach. When the metal liquid fills the mold cavity, the temperature rises too slowly and the fluidity becomes poor. Fill the mold cavity well, or make the surface of the die-casting product not meet the due requirements

2. If the pressure build-up time is too long, it will cause the metal material liquid in the mold cavity to cool down too much when the boost pressure is in place, the fluidity is already very poor, the boost pressure has no effect, and the die-casting products produced Density is not good enough, die casting products are unqualified

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