Research On The Key Issues Of The Rod Forming Process

Rod is a vehicle steering system one of the important parts, the main role is to provide stability for the vehicle when cornering. The traditional rod forging and processing the ordinary method of combining cutting, has obvious drawbacks:on the one hand the use of materials, low, low machining efficiency, high cost and complicated process; other required general forging force and easy produce flash, which destroyed the metal cutting fibrous tissue, so that part is usually very short life. Parts of this paper under the rod shape of features, the proposed multi-die forging process of forming the rod, roll forging process by forming rod blank. More to the use of separable die forging, rough shape by the time, you can get no flash, no forging slope (or a small slope) and a complex shape of the forging process; the roll forging process is characterized by a pair of counter-rotating die to produce continuous local deformation of rough.This article analyzed the characteristics of multi-rod forging process by combining of computer simulation and physical test validation method, and calculated more than the forging force by the principal stress method. Analysis of the structural features of rod, combined with more design experience to Die Forgings, designed more to forging bar graph, and complete three-dimensional shape of the rod forging; in the use of blank map of the blank calculation based on a clear system Billet Roll Forging use and design rod blank, and with respect to their mold cavity design, finite element simulation for the foundation; principal stress method and empirical formula were more to the forging process on the deformation force and clamping force is calculated and selected press.Finite element method analysis of multi-die forging and roll forging billet metal in the process of the flow law expounded multi-die forging and roll forging billet forming characteristics revealed deformation mechanisms. And on this basis, draw the flow of metal deformation state and the equivalent plastic stress and strain distribution of the visual description of a two-stage forming process and the equivalent stress-strain distribution, the curve obtained multi-die forging and roll forging system billet forming process of metal deformation laws. And finding twelve points on the rod multi-die forging to track the law of the metal flow, comparing the points flow among the process, and finding the law in the stress, strain and velocity distribution.Multi-die forging of the rod test verification process, and compared with the finite element simulation to validate the finite element simulation of the right or not. Multi-die forging of the bar test are rod parts, to a certain degree of analysis and comparison, and the force occurred during testing issues related to analysis and calculations, multi-die forging process forces some of the rules.