Executive Director of Guangdong Automobile Industry Association / Professor Lan Fengchong, Dean of School of Automotive Mechanical and Electrical Engineering, South China University of Technology

Metal processing online planning "Advanced stamping sheet metal process and equipment" theme forum, invites the know-how of the latest technology in digital industry, from the latest developments and applications of stamping sheet metal technology, equipment, technology, etc., showing the status quo of stamping sheet metal industry And development trends.

With the rapid development of the modern automobile industry, with the new requirements of energy, safety and environmental protection, automotive lightweight materials have attracted much attention, such as aluminum-magnesium alloys, high-strength steel sheets and other lightweight materials. Among them, high-strength steel sheets Forming is the best way to reduce the weight of the car body and improve the collision performance.

In cold stamping, the solution of rebound control is controlled by forming process → artificial intelligence → numerical simulation → experimental iteration → dynamic compensation factor rebound control method. The theory of springback compensation factor calculation introduces the material model, and through the rebound calculation and the second springback calculation, it has a more precise grasp of the radial rebound compared with the traditional rebound experience formula. The compensation formula is used to calculate the model, and the calculation formula of the rebound compensation factor is obtained, such as the complex Archimedes spiral blade in the mixing device, the free-form surface treatment, the rebound compensation factor, and the processed point cloud and surface reconstruction. After the spiral blade is repaired at one time, the nearest point ICP algorithm is used to obtain the part rebound value, and the forming model is reversely loaded to obtain the rebound value corresponding to each grid point and the stress distribution after reverse loading. According to the dynamic factor compensation, the feature section is extracted and compared, and the curved surface is the surface of the die surface compensation.

The automotive industry requires both high material strength and light weight. Although the anti-collision capability of the side of the car is increased by the addition of the anti-collision bar, the weight is increased and the protection effect is not good. High-strength steel hot-formed parts are increasingly used in automobiles due to their high strength, high hardness, light weight and small rebound forming characteristics, such as the bottom structure of the engine compartment, the front assembly platform, the front flue shield, and the front insurance. Bars, reinforced side beams, reinforced A/B columns, side rails, rocker stiffeners, rear bumpers, front and rear reinforcements for doors and windows, roof reinforcement fences and door beams.

The hot forming process of high strength steel sheet is:

Blanking→manipulator handling→heating→forming and quenching. Hot forming dies and cooling channels are critical during the forming process. Thermoforming CAE analysis yields: optimum austenitizing temperature, optimum martensite temperature for quenching, optimum forming temperature, optimum cooling rate, optimum forming pressure, and defects such as necking, cracking, and wrinkling. CAE analysis models and processes include: self-weight deflection → tightening → drawing → quenching → cooling, mechanical analysis and thermal analysis.

Based on the JSTAMP finite element simulation model, the thermal gradient in the thickness direction of the blank is studied. The basic steps and processes of the simulation are positioning, clamping and forming. The forming parameters are obtained in the hot forming process, the sheet temperature field and the blanking ring temperature field. Simulation results of punch temperature field, sheet thinning rate, etc.

High-strength steel sheet forming is divided into cold stamping forming and hot forming. The springback problem in cold stamping forming effectively controls the stamping springback by the dynamic compensation factor method, making the high-strength steel sheet forming more efficient. The hot forming is in the initial stage, and the parts with high strength and small rebound can be obtained by thermoforming. The simulation analysis can greatly improve the efficiency of the process analysis and save the test cost.

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