Method of producing plating high-strength components through high-temperature hot stamping

Abstract

The invention discloses a method of producing plating high-strength components through high-temperature hot stamping. The method comprises the processes of heating and mold inlet stamping, and is characterized in that in the heating process, when the thickness of a plating steel plate is 0.6-1.45mm, the heating temperature is 935-960 DEG C, and the total heating time is 5.5-10min; when the thickness of the plating steel plate is greater than 1.45mm and smaller than or equal to 3.0mm, the heating temperature is 945-970 DEG C, and the total heating time is 5-11min; the plating steel plate is heated in the front 1.0-2.0 minutes until the temperature is greater than or equal to 600 DEG C; and in the mold inlet stamping process, the mold inlet temperature of the plating strip steel is 755-780 DEG C, and the mold outlet temperature is smaller than or equal to 250 DEG C; and after clamping, a mold is cooled to 400 DEG C or below in 7s. According to the high-strength parts and components produced by the method disclosed by the invention, the yield strength is 950-1300MPa, the tensile strength is 1250-1600MPa, the elongation rate A80 is 5.0-8.5%, after hot stamping, the thickness of an aluminum silicon plating is 30-50um, the thickness of the middle layer is 16um or below, and time for resisting red rust except 20mm of a notch part is 96 hours or above; the production difficulty and theproduction cost are reduced; and the production cost of the integral hot-stamped high-strength parts and components is reduced.

Description

Technical field [0001] The invention relates to a method for producing high-strength parts, in particular to a method for producing high-strength parts with a coating by high-temperature hot stamping. Background technique [0002] The rapid development of the automobile industry has brought convenience to people’s production and has also brought many negative effects to people’s living environment. For example, to ensure the safety of automobiles, the weight of automobiles is increasing, and automobile exhaust emissions The amount also increased. In order to protect the environment without reducing the safety of automobiles, the lightweight of automobiles has emerged. The proportion of high-strength steel and ultra-high-strength steel used in auto parts is increasing, and the thickness is getting thinner. Because it can well avoid the problems of difficult stamping and serious springback, the use of hot stamping to make high-strength steel parts has been applied and popularized....

AI Technical Summary

Problems solved by technology

[0003] At present, most hot stamping high-strength parts in automobiles are generally achieved by using uncoated 22MnB5 steel plates, through heating, cooling, stamping and subsequent descaling (shot peening), phosphating, spraying and other means to achieve high strength and durability of parts. However, the production cost of this production method is high, and the environmental pollution is relatively large; especially the shot blasting process of descaling is not conducive to environmental protection; at the same time, the high-strength parts are easily deformed during the shot peening process, which affects Subsequent processing and assembly increase the difficulty of production

Images