Processing method of hot stamping parts of ultra-high-strength steel plates with different strengths and thicknesses

Abstract

The invention discloses a machining method of an ultrahigh-strength steel plate hot-stamping molding part with unequal strength and equal thickness. The machining method comprises the following steps: (1) machining a hotly-molded manganese-boron steel coil stock into sheet metal to be used through a blanking mold; (2) uniformly mixing zircon powder and absolute ethyl alcohol to obtain a mixed solution; (3) drawing a division line on the sheet metal in the step (1) to divide the sheet metal into a high-strength region and a low-strength region; (4) fully brushing the mixed solution of the step (2) on the outer surface of the low-strength region and waiting until the mixed solution on the outer surface of the low-strength region is completely aired; (5) putting the sheet metal, which is aired in the step (4), into a heating furnace and heating for 5 minutes; (6) taking out the sheet metal in the step (5) out by a transportation robot from the heating furnace and transporting the sheet metal onto a special hot-molding mold, and ensuring that the temperature of the sheet metal of the high-strength region is higher than 800 DEG C; (7) machining and molding the sheet metal in the step (6) by using a hot molding pressing machine, and keeping the pressure; and (8) after cooling the sheet metal, opening the mold and taking out the sheet metal. With the adoption of the machining method, machining steps and machining cost are reduced, and energy conservation and environmental friendliness are realized.

Description

technical field [0001] The invention relates to a hot-forming processing method for steel plates, in particular to a processing method for hot-stamping and forming parts of ultra-high-strength steel plates with different strengths and equal thicknesses. Background technique [0002] In the thermoformed parts of the car center pillar, the upper part needs higher strength to make the car well resist the intrusion of the shell during impact to ensure its integrity, and the lower part needs lower strength and higher plasticity to absorb the impact of the car energy to ensure the safety of passengers. Therefore, compared with the same-strength ultra-high-strength thermoformed parts, variable-strength thermoformed parts have greater demand in body-in-white due to safety considerations. At present, there are the following three methods for the manufacture of parts with different strengths, 1. Welding small reinforcement plate patches; welding small reinforcement plate patches incr...

AI Technical Summary

Problems solved by technology

At present, there are the following three methods for the manufacture of parts with different strengths, 1. Welding small reinforcement plate patches; welding small reinforcement plate patches increases the thickness of the parts, because the gap in some areas needs to be enlarged, which leads to difficulties in mold processing and debugging ; At the same time, the mold wears a lot during use; it is necessary to increase the welding process before forming; 2. Purchase steel plates with different thicknesses; the price is high; it is difficult to process and debug the mold

3. Laser welding of steel plates of non-identical materials requires an additional process before thermoforming; at the same time, because the plates are not the same, the strength transition zone of the parts is unstable

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