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首页> 外文会议>International Conference on Fluid Power Transmission and Control(ICFP' 2005); 20050405-08; Hangzhou(CN) >Pressure Control in a Low-pressure Casting Furnace
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Pressure Control in a Low-pressure Casting Furnace

机译：低压铸造炉中的压力控制

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摘要

The casting of light alloy components is a technology commonly used in aeronautic industry. This operation is possible, for example, using a low-pressure casting system, where it is important to control the temperature but also the maximum value and the time history of the pressure inside the furnace. For this reason it becomes important to study the pressurization circuit. In this paper a theoretical and experimental study of the pressurization circuit of a low-pressure casting furnace is presented, to individuate the temporal behaviour of the pressure inside the furnace. The main components of the system are: the flow regulation valves, the furnace, the connecting pipes among different parts of the system, the control unit and the related sensors. Particular attention has been paid to the experimental characterisation of the proportional valve with current-driven electro-pneumatic pilot. The opening of the principal valve is a function of the current of the pilot-valve. The characteristics, in terms of flow coefficients and response time, have been evaluated as a function of the upstream pressure and of the pilot current. A lumped parameters model has been developed, in which it is possible to vary the following parameters: type of valve and its coefficients, volume and temperature of the furnace, size of connecting pipes and supply pressure. The resistive and capacitive effects have been considered for the tube model but the inductive effect has been neglected. For the furnace only the capacitive effect has been take into account. The influence of the different parameters on the furnace pressure has been evaluated; experimental results obtained from tests on single components have used to find the parameters of the numerical model. The validation of the whole pressurizing furnace circuit model has been made with an experimental set-up properly realised. For every working condition, a good agreement between numerical and experimental time history of the pressure inside the furnace has been obtained. A further model validation has been made by using experimental results obtained by an existing foundry circuit. Also in this case good agreement has been obtained.
机译：轻合金零件的铸造是航空业常用的技术。例如，可以使用低压铸造系统进行此操作，在该系统中，控制温度以及炉内压力的最大值和时间历程非常重要。因此，研究加压回路变得重要。在本文中，对低压铸造炉的加压回路进行了理论和实验研究，以区分炉内压力的时间行为。该系统的主要组成部分是：流量调节阀，熔炉，系统不同部分之间的连接管，控制单元和相关的传感器。特别注意的是带有电流驱动的电动气动先导阀的比例阀的实验特性。主阀的开度取决于先导阀的流量。根据流量系数和响应时间，已根据上游压力和先导电流对特性进行了评估。已经开发了集总参数模型，在其中可以更改以下参数：阀门类型及其系数，炉子的体积和温度，连接管的尺寸和供应压力。对于电子管模型，已经考虑了电阻和电容效应，但是电感效应却被忽略了。对于熔炉，仅考虑了电容效应。评估了不同参数对炉压的影响；通过对单个组件进行测试获得的实验结果已用于找到数值模型的参数。整个加压炉回路模型的验证是通过适当实现的实验装置进行的。对于每种工作条件，都已在炉内压力的数值和实验时间历程之间取得了良好的一致性。通过使用现有铸造厂获得的实验结果进行了进一步的模型验证。同样在这种情况下，已经获得了良好的共识。

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