(燕山大學 先進鍛壓成形技術(shù)與科學教育部重點實驗室，秦皇島 066004)
摘 要: 起皺失穩(wěn)問題是空心薄壁類零件在加工和應用領域的主要瓶頸。基于此，對金屬薄壁管件縮徑成形過程中的彈塑性失穩(wěn)規(guī)律進行研究，提出預測縮徑褶皺、提高成形件質(zhì)量的方法及技術(shù)手段。基于L. H. Donnell線性屈曲理論，推導了管坯均布外壓作用下的環(huán)向彈性及塑性起皺臨界載荷表達式；探討了成形條件及材料參數(shù)對管材抗起皺性能強弱的影響。利用固體顆粒介質(zhì)縮徑工藝實現(xiàn)了AA7075管材不同熱處理條件下的縮徑成形，工藝試驗驗證了管材縮徑成形起皺失穩(wěn)理論的相關(guān)結(jié)論。
關(guān)鍵字: AA7075鋁合金管件; 縮徑成形; 起皺失穩(wěn); 固體顆粒介質(zhì)成形
（Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao 066004, China）
Abstract:The main factor restricting the production and application of diameter-reduced tube parts is the wrinkling instability problem. Therefore, the wrinkling instability laws in the process of tube outer pressure compression forming were researched, and the technology methods for winkle prediction and forming quality improvement were ascertained. Based on the theory of L. H. Donnell linear buckling, the circumferential elastic and plastic wrinkling critical load expression was deduced, the influences of the forming conditions on the wrinkled morphology and the shaping property were also discussed. The AA7075 diameter-reduced tube parts by using the blank under different heat treatment conditions were produced by solid granule medium forming (SGMF) technology, and the process tests proved the conclusions of theoretical analysis.
Key words: AA7075 aluminum tube part; tube outer pressure compression forming; wrinkling instability; solid granule medium forming
