Pressure jetting unit for pressure casting machine and its control method

Abstract

The present invention discloses one pressure jetting unit for pressure casting machine and its control method. The pressure jetting unit includes mainly a pressure jetting part, a hydraulic part, and a control part. By means of setting a high response and great flow rate throttle valve to the outlet of pressure jetting cylinder cavity and a real-time controller for the throttle valve, the speed of the pressure jetting process is real-time controlled through combining the oil outlet throttle and the oil inlet throttle. The present invention can realize the closed loop real-time control of constant acceleration slow pressure jetting, sectional pressure jetting, burr preventing deceleration and other functions, and results in fast response, high stable state precision and high technological flexibility of pressure jetting process.

Description

technical field [0001] The invention relates to an injection device and a control method of a die-casting machine, in particular to an injection device and a control method capable of performing real-time closed-loop control on the injection process. Background technique [0002] Figure 1 is a schematic structural diagram of the injection device system of an existing die-casting machine, which is composed of an injection part, a hydraulic part, and a control part. The injection process generally adopts three-stage injection: the first stage is initial and slow pressure. The injection stage, the second stage is the rapid injection filling stage, and the third stage is the pressurized compaction stage. The speed control of the injection process adopts the traditional throttling control method of the oil inlet. [0003] Fig. 1 also shows the mold part of the die casting machine, including the mold W1, the mold cavity W2, and the pressure chamber W3. [0004] The injection par...

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Problems solved by technology

[0013] 1. The real-time monitoring and control of the actual injection process parameters during the injection process cannot be monitored and controlled. The injection conditions can only be adjusted according to the operator's feeling and experience, and the quality of the casting according to visual inspection, so there is a great chance , unable to effectively control the quality of die-casting products

[0014] 2. When the injection conditions change, the injection conditions can only be manually adjusted before the next injection starts, and the system changes cannot be controlled in real time during the injection process

Therefore, the repeatability of the injection process is poor, resulting in low production efficiency and large fluctuations in product quality

[0015] 3. Only a slow injection speed and a fast injection speed can be set in one injection process, and multi-level speed adjustment cannot be dynamically adjusted according to the process requirements, and the adaptability and flexibility to the die-casting process requirements are poor

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