發(fā)布時(shí)間：2018-03-31 08:04

  本文選題：壓鑄　切入點(diǎn)：數(shù)值模擬　出處：《沈陽理工大學(xué)》2017年碩士論文

【摘要】：壓力鑄造(壓鑄)因?yàn)槠洫?dú)特的材料成型工藝,廣泛的應(yīng)用于零件生產(chǎn)中,但因模具的非合理設(shè)計(jì)而造成的壓鑄缺陷會(huì)影響到壓鑄件的表觀質(zhì)量和使用性能。在傳統(tǒng)工藝中設(shè)計(jì)人員使用試模的方法完成對(duì)某種鑄造工藝的檢驗(yàn),這種方法耗時(shí)多,成本高。如何在壓鑄模具設(shè)計(jì)前期發(fā)現(xiàn)可能存在的結(jié)構(gòu)問題對(duì)于后期壓鑄參數(shù)的有效調(diào)整、生產(chǎn)高質(zhì)量產(chǎn)品是極其重要的。鑄造數(shù)值模擬的發(fā)展很好的解決了上述問題。經(jīng)過多年的發(fā)展鑄造數(shù)值模擬已被證明能夠有效的設(shè)計(jì)、修改壓鑄工藝,改進(jìn)模具結(jié)構(gòu),從而降低產(chǎn)品試制周期,降低生產(chǎn)成本,提高材料利用率。閥體作為閥門上的重要零件,其質(zhì)量的好壞會(huì)影響到經(jīng)濟(jì)的發(fā)展甚至威脅到生命安全,因此在生產(chǎn)高質(zhì)量的閥體零件對(duì)于生產(chǎn)者以及消費(fèi)者都是至關(guān)重要的。以澆注溫度、模具預(yù)熱溫度、澆注速度、內(nèi)澆口面積、內(nèi)澆口厚度、內(nèi)澆口寬度以及壓射比壓為因素,以卷氣量、充型時(shí)間、凝固時(shí)間、缺陷含量等為指標(biāo)建立七因素三水平正交實(shí)驗(yàn)。使用ProCAST鑄造模擬軟件對(duì)每組正交實(shí)驗(yàn)進(jìn)行壓鑄過程數(shù)值模擬,通過對(duì)比分析不同正交實(shí)驗(yàn)下金屬液體的流動(dòng)過程、凝固狀態(tài)、卷氣狀態(tài)、缺陷含量等,確定了閥體壓鑄件采用扁平側(cè)澆澆口,其尺寸是:面積75mm2、厚度2.5mm、長度2mm;壓鑄工藝參數(shù):澆注溫度620℃、預(yù)熱溫度200℃、澆注速度0.5m/s、壓射比壓70MPa。根據(jù)模擬結(jié)果設(shè)計(jì)并制造了閥體壓鑄模具,進(jìn)行壓鑄實(shí)驗(yàn),通過金相實(shí)驗(yàn)得到了合格閥體壓鑄件產(chǎn)品,驗(yàn)證了鑄造模擬仿真的科學(xué)性,可靠性。
[Abstract]:Pressure casting (die casting) is widely used in parts production because of its unique material forming technology. However, the defects of die casting caused by the unreasonable design of the die will affect the apparent quality and performance of the die castings. In the traditional process, the designers use the method of mold test to complete the testing of a certain casting process, which takes a lot of time. High cost. How to find the possible structural problems in the early stage of die casting die design for the effective adjustment of die casting parameters, It is very important to produce high quality products. The development of numerical simulation of casting has solved the above problems well. After years of development, numerical simulation of casting has been proved to be able to effectively design, modify the die casting process, improve the structure of the die. As an important part of valve, the quality of valve body will affect the development of economy and even threaten the safety of life. Therefore, the production of high quality valve body parts is essential for both producers and consumers. Factors such as pouring temperature, mold preheating temperature, pouring speed, internal gate area, inner gate thickness, inner gate width, and injection specific pressure are factors, Seven factors and three levels of orthogonal experiments were established by taking the volume of gas volume, filling time, solidification time and defect content as indexes. Each group of orthogonal experiments was numerically simulated by using ProCAST software. By comparing and analyzing the flow process, solidification state, entrainment state and defect content of metal liquid under different orthogonal experiments, the flat side pouring gate was determined for the valve body die casting. The die casting process parameters are: pouring temperature 620 鈩，

本文編號(hào)：1689853