The Simulation Study on Drawing and Forming of Automobile Panels Based on CAE

Automobile panels have the characteristics of thin material,complex shape,large structure and size and high-quality requirements on surface,so the workblank deformation is also very complicated in the process of forming, and it is vulnerable to forming defects such as wrinkling and cracking and so forth. Based on Dynaform, a method of parameterized design for automobile panels is discussed here, which includes the designs of stamping direction, addendum surface, binder surface and draw bead. The simulation and analysis on forming process of automobile panels provides a basis for completing modular surface design. Obviously, the results show that the simulation on forming process of automobile panels by Dynaform software shortens the mold development time and mold tryout cycle and lowers cost.

Analysis of Die Lock for Stamping Parts

To solve problem of die lock area appeared in process of stamping, this paper presents method of coordinate comparison to qualitatively detect die lock area, and set out mathematical model to quantitatively adjust the stamping direction. The methods are utilized to a stamping part, and the results show the methods can effectively solve the die lock area problem.

Automatic Algorithm of Automotive Stamping Direction Based on GA

The right panel drawing direction is an important prerequisite for generating qualified parts, an important step before the panel forming simulation is to determine the reasonable direction of the drawing. Manually adjust parts in order to overcome rely on experience, the drawbacks to the drawing direction, the direction of the drawing punch and forming the contact area of the sheet as the goal of automatic determination algorithm. Objective function of the direction of the drawing for the variable contact area in the drawing direction of the feasible region, the use of heritage algorithms to optimize the objective function of the contact area and, ultimately feasible within the contact area corresponding to the drawing direction, that is the best drawing direction. The measured results show that the direction of the drawing based on genetic algorithm, the automatic algorithm can fast and accurate to obtain the optimal direction of drawing.

Application on Mathematics Multiple Equation for Automatic Stamping Direction

The most important process of forming simulation pretreatment is to determine drawing direction. As the main factor to effect the flow direction and velocity of sheet metal, the unreasonable drawing direction would lead to fold and wrinkle of panel . Moreover, the reasonable drawing direction is an important basis of drawing mould structure and the subsequent process design. The traditional drawing direction of panel depends on the experience of technician that constantly rotating part, which rely on the experience of technician and would consume more time and labor force, furthermore, it is difficult to stable obtain the optimal direction in the feasible region of the drawing direction.The measured results show that the direction of the drawing based on genetic algorithm, the automatic algorithm can fast and accurate to obtain the optimal direction of drawing.

Optimization of the Stamping Direction for Complex Parts Based on 3D Mesh Model

A new algorithm directly based on 3D mesh model is presented to determine the reasonable stamping direction in CAE software. Compared with former similar optimization algorithms of the stamping direction, it can simplify the procedure and avoid the missing of some necessary details of complex parts, and it is automatic and intellective to determine the reasonable stamping direction. The feasibility of the algorithm has been proved by the creation of stamping directions of the automobile fender.

Analysis and Control of Car Door Inner Panel Forming Fracture Based on Experience Knowledge and Numerical Simulation

The process factors influencing the forming quality of car inner door panel such as stamping direction, binder surface, draw-bead, addendum surface and technical cut are determined based on experience knowledge. Aiming at local fracture problem of test pieces, some key parameters are determined based on experience knowledge, and the strain in thinning area of sheet metal forming is analyzed by numerical simulation. Based on this, process optimization and die modification scheme are put forward. Engineering inspection proved that optimized process and die parameters are reasonable, after increasing die fillet radius and process hole radius, decreasing draw-bead height, qualified products are achieved and fracture flaw is well controlled.