(1. 哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院，哈爾濱150001；
2. 一汽轎車股份有限公司，長春 130001)
摘 要: 為了實(shí)現(xiàn)鋁合金副車架在某型國產(chǎn)高檔轎車中的應(yīng)用，對其副車架橫梁的內(nèi)高壓成形過程進(jìn)行實(shí)驗(yàn)研究。測量管件內(nèi)典型截面在壓彎、預(yù)成形以及內(nèi)高壓成形工序中的環(huán)向壁厚分布，分析截面的壁厚分布規(guī)律；建立管件內(nèi)典型截面尺寸的正態(tài)概率分布函數(shù)，得到截面各尺寸相對于設(shè)計(jì)值的最大偏差。結(jié)果表明：對于膨脹量為2.63%的異形截面A-A，最大減薄位置位于長直邊與左下圓角的過渡區(qū)，最大減薄率為15.6%；對于膨脹量為3.31% 的矩形截面B-B，最大減薄位置位于長直邊與右下圓角的過渡區(qū)，最大減薄率為15.8%。此外，截面A-A的最大尺寸偏差為0.19 mm，截面B-B的最大尺寸偏差為0.28 mm。兩個(gè)典型截面的壁厚分布及尺寸精度均滿足設(shè)計(jì)要求。
關(guān)鍵字: 6063鋁合金；內(nèi)高壓成形；壁厚分布；尺寸精度
（1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. China FAW Group Corporation, Changchun 130001, China）
Abstract:In order to realize the application of aluminum sub-frame in domestic car, experimental researches were conducted to investigate the hydroforming process of the sub-frame. The thickness distribution on typical section of tubular parts along the circle direction during the press bending, preforming, and hydroforming processes was separately measured, and the thickness distribution rule was mainly discussed. Then, the normal distribution function based on statistical analysis for the geometry size of various sections was carried out, and the maximum dimensional deviation compared with the designed requirement was obtained. The results show that, the maximum thinning rate of the irregular section A-A with a expansion rate of 2.63% is 15.6%, which is located at the transition region between the long straight side and left bottom corner, and the maximum dimensional deviation is 0.19 mm. The maximum thinning rate of rectangle section B-B with a expansion rate of 3.31% is 15.8%, which is located on the transition region between the long straight side and right bottom corner, and the maximum dimensional deviation is 0.28 mm. Both the thickness distribution and dimensional accuracy meet the design requirements.
Key words: 6063 aluminum; hydroforming; thickness distribution; size deviation
