A die-casting mechanism of a horizontal cold chamber vacuum die-casting machine and a method for using it for die-casting

Abstract

The invention discloses a die-casting mechanism of a horizontal freezing chamber vacuum die-casting machine. The die-casting mechanism comprises a pressure chamber, a die-casting die, a vacuum valve, a punch, an injection rod, a first stop valve, a first vacuum system, a second stop valve, a second vacuum system, a control device and a displacement sensor. The die-casting die comprises a fixed die body and a movable die body, the movable die body and the fixed die body are matched, and therefore a cavity, an inner gate and an exhausting way are formed. The vacuum valve is arranged in a valve cavity in the fixed die body. The punch is fixedly connected with the injection rod. The pressure chamber is provided with a casting gate and a pipe connecting joint, the pipe connecting joint is connected with a second vacuum pipe, the other end of the second vacuum pipe is connected with the second stop valve, and the second stop valve is connected with the second vacuum system. The control device is used for controlling operation of the first vacuum system and the second vacuum system and controlling opening and closing of the first stop valve and the second stop valve. The die-casting mechanism has the beneficial effects of being good in vacuumizing effect, easy and convenient to arrange and maintain, low in fault rate and long in service life.

Description

technical field [0001] The invention belongs to the field of die-casting machines, and more specifically relates to a die-casting mechanism of a horizontal cold chamber vacuum die-casting machine and a die-casting method using the die-casting mechanism. Background technique [0002] Vacuum die-casting technology is a casting forming method that uses a vacuum source to discharge the gas inside the mold cavity, and then fills the mold cavity with molten metal in this vacuum state. Vacuum die-casting inherits the advantages of ordinary die-casting methods, but it can greatly reduce the internal porosity defects of castings, and has a significant effect on improving the quality of castings, so it has been widely used. [0003] Existing vacuum die-casting generally extracts the gas in the cavity through the vacuum valve installed on the mold. There are some problems in the use of this method: [0004] 1) Due to the limitation of the exhaust cross-sectional area of ​​the vacuum v...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the limitation of the exhaust cross-sectional area of ​​the vacuum valve and the cross-sectional area of ​​the overflow notch, it is difficult to quickly discharge a large amount of high-temperature flue gas generated during pouring in the pressure chamber away from the vacuum valve, because they need to pass along the runner, ingate, The cavity, overflow groove, overflow notch, air extraction channel and vacuum valve can only be discharged out of the cavity, the path is long and time-consuming

[0005] 2) The high-temperature flue gas is discharged through the remote vacuum system, which will cause the temperature of some key components of the vacuum system such as valves and vacuum pumps to be too high, which will affect the normal operation of these components, increase the failure rate of parts, and reduce the reliability

3) Patent 201210445304.X (a multi-directional vacuum pumping device for die-casting) is also equipped with a vacuum port on the pressure chamber, but it starts vacuuming after the punch seals the sprue, and the front edge of the punch swings The liquid is easy to enter the suction port, which will cause the suction port to be blocked and the failure rate is high

And once the suction port on the pressure chamber is blocked, the suction effect in the pressure chamber will be invalid.

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