(華南理工大學(xué) 機(jī)械與汽車(chē)工程學(xué)院，廣州 510640)
摘 要: 提出一種主動(dòng)式模具溫控方法，并開(kāi)發(fā)測(cè)控系統(tǒng)將其應(yīng)用于凝固成形中，通過(guò)主動(dòng)的外加可控溫度場(chǎng)來(lái)控制零件成形過(guò)程，實(shí)現(xiàn)零件按自下而上的順序凝固。主動(dòng)的外加可控溫度場(chǎng)通過(guò)均勻分布在模具中獨(dú)立的加熱與冷卻單元實(shí)現(xiàn)，并開(kāi)發(fā)了基于工控組態(tài)軟件的應(yīng)用系統(tǒng)實(shí)現(xiàn)流程控制。進(jìn)行了成形過(guò)程的數(shù)值模擬與成形實(shí)驗(yàn)，使測(cè)控系統(tǒng)及控制策略的設(shè)計(jì)得到檢驗(yàn)和改進(jìn)。數(shù)值模擬結(jié)果表明：成形過(guò)程中，工件等溫面基本保持平面，固液界面沿z軸方向向上移動(dòng)，符合主動(dòng)式溫控的預(yù)期目標(biāo)。成形實(shí)驗(yàn)結(jié)果表明：采用主動(dòng)溫控方案2進(jìn)行零件成形時(shí)，零件成形質(zhì)量較好，內(nèi)部沒(méi)有縮孔縮松等缺陷。
關(guān)鍵字: 模具；溫控；凝固成形；組態(tài)軟件
in solidification
（School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:An active mold temperature control method was presented and applied in solidification by developing a measure and control system. The forming process was controlled by the active outer controllable temperature field, which was brought by the individual heating and cooling units distributed in the proportional spacing towards the solidification direction in the mold. Thus, the product solidifies from the bottom to top. The flow control was implemented by developing the application based on the configuration software. The system and control strategy were verified and improved by simulation and experiment research of forming process. The simulation results show that the isothermal surfaces of workpiece are near-planar, and the solid-liquid interface moves up along the z direction during solidification progresses. The experimental results indicate that, by the active temperature control method case 2, no shrinkage defects exist in the product and the forming quality is promoted.
Key words: mold; temperature control; solidification; configuration software
