CAJ | 학술논문

为研究摩擦在超塑成形中对零件壁厚分布的影响，以 TC4钛合金负角度法兰盘零件为背景，采用 MSC． MARC 有限元数值模拟分析了单面正向成形下模变摩擦和正反向成形上模变摩擦对零件壁厚的影响．通过方差分析和极差分析研究了正反向成形上模不同区域摩擦的变化对最小壁厚和壁厚均匀性的影响。结果表明：单面正向成形中，摩擦越小，负角度壁壁厚减薄越大，而正角度壁壁厚确呈相反的趋势；正反向成形中，当下模摩擦固定时，随着上模摩擦系数的增大，实际零件的最小壁厚相应增大；正反向成形上模不同区域摩擦的变化，对零件的最小壁厚和壁厚分布产生不同的影响；反向成形过程中板料先接触模具的部位对零件的壁厚影响较大。
위연구마찰재초소성형중대령건벽후분포적영향，이 TC4태합금부각도법란반령건위배경，채용 MSC． MARC 유한원수치모의분석료단면정향성형하모변마찰화정반향성형상모변마찰대령건벽후적영향．통과방차분석화겁차분석연구료정반향성형상모불동구역마찰적변화대최소벽후화벽후균균성적영향。결과표명：단면정향성형중，마찰월소，부각도벽벽후감박월대，이정각도벽벽후학정상반적추세；정반향성형중，당하모마찰고정시，수착상모마찰계수적증대，실제령건적최소벽후상응증대；정반향성형상모불동구역마찰적변화，대령건적최소벽후화벽후분포산생불동적영향；반향성형과정중판료선접촉모구적부위대령건적벽후영향교대。
In order to study the influence of the friction on the thickness distribution of part in superplastic forming,based on TC4 neg-ative angle complex parts,the influence of low-die in single-direct SPF and up-die in direct-reverse SPF on thickness distribution was analyzed with MSC.and MARC.The influence of friction changing in different areas of up-die in direct-reverse SPF on the minimum thickness and the thickness distribution were analyzed with ANOVA and range analysis.The results show that the smaller of friction, the greater thinning of the negative wall thickness while the thickness of positive angle wall was opposite.In direct-reverse SPF,when the friction of low-die is fixed,as the friction coefficient of up-die increases,the minimum thickness of actual part increases according-ly.There are different effects on minimum thickness and thickness distribution as the friction in different areas of up-die in direct-re-verse SPF changes.The thickness effect of the part is greater while the sheet contacts the die earlier.