圆弧焊缝拼焊板成形性能的影响因素分析

RESEARCH ON THE INFLUENCE FACTORS OF TAILOR-WELDED BLANKS WITH ARC-WELD-LINE

为了提高拼焊板的成形质量,针对固定圆弧半径R=180 mm差厚拼焊板,利用Dynaform数值模拟仿真技术与正交设计相结合的方法,对影响横向圆弧焊缝拼焊板成形质量的强度比、凸凹模间隙、薄侧压边率、摩擦因数、总压边力、板厚比因素进行了分析。结果表明:强度比、摩擦因数、总压边力及板厚比对成形结果影响相对较大。随着薄侧母材强度的提高,其抵抗变形的能力不断增强,使得薄侧母材变形程度降低导致焊缝移动量有所降低,拼焊板成形质量有所提高。摩擦因数和总压边力对拼焊板的成形性能的影响并不是很大,但过大的摩擦因数和过大的总压边力会影响两侧母材的材料流动性,进而影响板料的最终成形质量。在设计拼焊板时,板厚搭配应仔细考虑,一般把板厚比取在1.0~1.0到1.0~1.4这个范围之间成形较为稳定,过小和过大的板厚比不利于拼焊板成形。

The method is to combine dynaform numerical simulation techniques and orthogonal experimental design to analyze the influence factors of intensity ratio,clearance between punch and die,thin side blank holder rate,friction coefficient,blank-holder force and thickness ratio to improve the quality of TWBs,. The research show that Strength ratio, friction coefficient,blank-holder force and the thickness ratio on the forming results is relative bigger. As a whole,tailor-welded sheet forming improved with the increment of the strength of parent metal,because the deformation degree of thin side parent metal reduce the weld-line movement for enhancing its ability to resist deformation. Friction coefficient and blank-holder force is not very big on the influence of the formability of tailor-welded sheet,but the bigger friction coefficient and the bigger total blankholder force affect on both sides of the base material of liquidity,finally,it affects the quality of the forming of the sheet metal.Thickness ratio should be carefully considered in the design of welding plate. Generally,the thickness ratio between 1. 0-1. 0and 1. 0-1. 4 improved the forming of tailor-welded blanks with arc-weld-line,the small and large of thickness ratio are not beneficial to tailor-welded sheet forming.