|
The crane jib quality is directly related to the overall performance of the crane , crane in cross-sectional shape of the main factors to affect the crane carrying capacity . Semicircular boom section has a higher carrying capacity , the trends of the current boom . However , the traditional semi-circular jib molding process is more complex forming process , low efficiency and poor quality . To address these shortcomings , the paper by the finite element technique , semicircular jib forming process , and achieved remarkable results . Main content and the results are as follows : ( 1) for the production of the actual situation , such as bending pass , not smooth arc the sheet metal and punch moldbase interference , sheet metal to warp , find the main factors and pressure test during the simulation , and virtual rely mold method, mixed bending method to resolve them . (2) using the finite element analysis of forming processes , improving processes and influencing factors , and the simulation results in line with actual production requirements , and bending pass greatly reduced in comparison with the original process . Analog using a punch size is still less than the theoretical calculation of the Punches size can not achieve a smooth transition , affecting the quality of the workpiece , so that the arc region . (3) because the single arc punch only get to a particular smooth circular arc of the workpiece , double arc punch design , it can be molded to a plurality of smooth arc workpiece , thereby improving the mold use efficiency . Two different radius of the workpiece by finite element techniques for process analysis, the results meet the production requirements , and achieve arc smooth transition . Experimentally verify the correctness of the process and the composite mold design reasonable , the new technology of bending pass only 1 / 3 of the original , greatly improving production efficiency and smooth arc , to improve the quality of the workpiece .
|