宽板U形弯曲理论及实验研究-材料加工工程专业论文.docxVIP

些生奎兰三兰堡兰兰堡笙茎Abstract 些生奎兰三兰堡兰兰堡笙茎 Abstract Sheet bend forming is one of more used common processing methods which turns the sheet into certain shape and angle．As thickness and overall size scope of workpiece is very big，the shape and precision of workpiece also exist very difference，therefore there ale many bending technique methods in the application，for example，V-bending，U—bending and other complex shape bending ete．The existing of springback influence the precision of workpiece seriously during the sheet bending forming process．Springback in matter of mould、the shape and size of workpiece、material performance of sheet and parameter of others，so spnngback is very complex and important too，forecast and control it is the key of improve the precision of workpiece． This article has researched the influencing factor of bending springback looking the sheet U-bend forming as the object of study throu曲the theoretical analysis and the experiment．The relationship between bending force and bending stoke and the theoretical calculation formula of bending springback has been analyzed and inferred；Using the data acquisiton system basing on the LabVlEW has carried the material performance parameter test experiment； Using the U-bending experimental system has carded the experiment of U free bending and U draw bending；The influence rule of springback about material performance。sheet thickness，the mold size，the pressure—pad—force as well as the friction ere．has analyzed which has certain guiding sense to U-bending craft making and the mold design，as well as the following U—bend forming intellectualized control research． Keywords U—bending；Sheet forming；Theory and experimental study； Springback；Data acquisition system Ⅱ 燕山大学硕士学位论文原创性声明本人郑重声明：此处所提交的硕士学位论文《宽板u形弯曲理论与实 燕山大学硕士学位论文原创性声明 本人郑重声明：此处所提交的硕士学位论文《宽板u形弯曲理论与实 验研究》，是本人在导师指导下，在燕山大学攻读硕士学位期间独立进行研 究工作所取得的成果．据本人所知，论文中除已注明部分外不包含他人已 发表或撰写过的研究成果。对本文的研究工作做出重要贡献的个人和集体， 均已在文中以明确方式注明。本声明的法律结果将完全由本人承担。 作者签字月明博 日期如7钙月f黟日 燕山大学硕士学位论文使用授权书 《宽板U形弯曲理