低压铸造机液面加压系统优化设计

The Optimization Design about the Surface Pressure Pneumatic Servo System of the Low Pressure Casting

本文主要是针对实际生产时,低压铸造机的液面加压气动系统中压力控制不精确的问题,完成了对原有系统的改进,根据低压铸造工艺的特点,以气动系统压力控制要达到的效果为出发点,设计了气动伺服闭环控制系统,为保证系统的安全运行,防止系统压力过高,采用了三种并行卸压方式,增强了工作的可靠性。其次,对气动系统中所需要的最大耗气量进行了计算,并以此为依据选出了合适的电气伺服阀,完成了其它关键元件的计算和设计选型。

This research aims at solving the problems of the surface pressure control precision of the low pressure casting in the actual production,and has finished the improvements on the original system. First of all,according to the characteristics of the low pressure casting process,this paper introduces the working principle of the low pressure casting. With the intent to achieve ideal control effect which the surface pressure pneumatic system should do,design the closed-loop control of pneumatic servo system. In order to ensure the safe operation of the system and prevent the too high system pressure,three parallel pressure relief ways are proposed in this paper,enhancing the reliability of the work. Secondly,the max air consumption which the pneumatic system need is calculated,and on this basis to select the appropriate electrical servo valve,of course,the calculation and design selection about the other critical element are finished at the same time.