深圳大学学报（理工版）
深圳大學學報（理工版）
심수대학학보（리공판）
JOURNAL OF SHENZHEN UNIVERSITY (SCIENCE & ENGINEERING)
2014年
3期
233-238
,共6页
金属压力加工%变压边力%激光拼焊板%成形性能%焊缝%应变路径%应变分布
金屬壓力加工%變壓邊力%激光拼銲闆%成形性能%銲縫%應變路徑%應變分佈
금속압력가공%변압변력%격광병한판%성형성능%한봉%응변로경%응변분포
metal pressure working%variable blank holder force%tailor-welded blank%formability%weld-line%strain path%strain distribution
为研究变压边力对差厚拼焊板成形性能的影响，以差厚拼焊圆筒形件为例，设计2种随位置、行程不同的变压边力方案，得到了差厚激光拼焊圆筒形件的成形极限深度、焊缝移动量、破裂危险点处应变路径及焊缝两侧应变分布的变化情况。研究表明，薄、厚侧压边力的大小和分布对破裂危险点应变路径和安全裕度的影响很大，合理的变压边力分布可以调节焊缝两侧材料变形的均匀性，提高成形极限深度；通过变压边力技术可以控制薄侧破裂危险点的应变路径由拉压应变状态向双向拉伸应变状态过渡，从而调节破裂失效的位置，有效提高差厚激光拼焊圆筒件的冲压成形性能。
為研究變壓邊力對差厚拼銲闆成形性能的影響，以差厚拼銲圓筒形件為例，設計2種隨位置、行程不同的變壓邊力方案，得到瞭差厚激光拼銲圓筒形件的成形極限深度、銲縫移動量、破裂危險點處應變路徑及銲縫兩側應變分佈的變化情況。研究錶明，薄、厚側壓邊力的大小和分佈對破裂危險點應變路徑和安全裕度的影響很大，閤理的變壓邊力分佈可以調節銲縫兩側材料變形的均勻性，提高成形極限深度；通過變壓邊力技術可以控製薄側破裂危險點的應變路徑由拉壓應變狀態嚮雙嚮拉伸應變狀態過渡，從而調節破裂失效的位置，有效提高差厚激光拼銲圓筒件的遲壓成形性能。
위연구변압변력대차후병한판성형성능적영향，이차후병한원통형건위례，설계2충수위치、행정불동적변압변력방안，득도료차후격광병한원통형건적성형겁한심도、한봉이동량、파렬위험점처응변로경급한봉량측응변분포적변화정황。연구표명，박、후측압변력적대소화분포대파렬위험점응변로경화안전유도적영향흔대，합리적변압변력분포가이조절한봉량측재료변형적균균성，제고성형겁한심도；통과변압변력기술가이공제박측파렬위험점적응변로경유랍압응변상태향쌍향랍신응변상태과도，종이조절파렬실효적위치，유효제고차후격광병한원통건적충압성형성능。
To study the influence of variable blank holder forces on the formability of tailor-welded blank ( TWB) , cylinder-shaped parts with different thicknesses were used, and two kinds of variable blank holder force ( VBHF) control schemes were designed. The forming limit depth, weld-line movement, strain path variations near the fracture zone and strain distribution changes across the weld-line were obtained. The results show that there is no inevitable connection between the forming limit depth and the amount of weld-line movement; the strain path of fracture zone near the weld-line is close to the plane strain state, while the strain path of the punch fillet is a segmented strain state which changes from a tension and compression state to a biaxial stretching state; with the increase of BHF on the thinner/thicker side, the strain concentration of thinner side will avoid the generation of rupture defects eventually.
