The Process Control of Hydroustatic Extrusion
|關鍵字:||靜水壓擠製;製程控制;Hydroustatic Extrusion;Process Control|
Hydrostatic extrusion is a process under which a high hydrostatic pressure is directly used to push the material through extrusion die. High extrusion ratio and high quality for products are two main advantages for this process. Traditionally, the hydrostatic extrusion apparatus is expensive and difficult to manufacture, therefore there are almost no researches of hydrostatic extrusion in Taiwan. Recently, our laboratory established an apparatus of hydrostatic extrusion , which included ultrahigh hydrostatic extruder, high-pressure plunger, high-pressure seal and backpressure system. Preliminary extrusion tests had also been conducted successfully. This research focused on improving this apparatus by adding feedback control system for accurate control of extrusion process. In addition, PC-based process control interface had been designed, set up, and tested in order to reduce the human error during operations. Finally, a series of extrusion experiment had been conducted using this improved apparatus. The effects upon extrusion products resulted by process parameters, such as the input modes of main pressure, the backpressure and the controlled extrusion speed, were observed.
|Appears in Collections:||Thesis|