Heat forming production line and production method of variable strength part

Abstract

The invention discloses a heat forming production line and production method of a variable strength part. The production line comprises an unstacking device, a feeding device, a first heating furnace,a second heating furnace, a material outgoing device, a pressing machine and a discharging device which are sequentially arranged; a gas blowing cooling device is arranged on the discharging side ofthe first heating furnace; and a variable strength coating mold is arranged in the pressing machine, and comprises a soft area provided with a thermal barrier coating on the surface and a hard area internally provided with a cooling water way. Due to the heat forming production line and production method of the variable strength part, blank which is just discharged out of a furnace can be subjected to local transitory cooling, and the forming temperature of the blank is controlled within an ideal range. According to the prepared variable strength heat formed part, the soft area position can beany position of the part, meanwhile, a transition interval of the soft area and the hard area is narrow, the soft area is high in extending rate, and the production efficiency is high.

Description

Technical field [0001] The invention relates to the field of thermoforming, in particular to a thermoforming production line and production method of variable-strength parts. Background technique [0002] At present, the high-strength hot forming process prepares the hard zone of the variable-strength hot-formed parts, usually by heating the blank to a temperature above the complete austenite transformation temperature, that is, above 860°C, and then rapidly cooling, that is, with an average cooling of more than 27°C / s Only by cooling the mold at a high speed can we obtain an ultra-high strength quenched structure with martensite as the main body and a tensile strength of 1500 MPa, that is, the hard zone. [0003] There are generally two ways to realize the soft zone, one is to reduce the heating temperature of the soft zone. The heating temperature of the soft zone area is controlled below the austenite transformation initiation temperature 700 ℃, the original structure ferrite / p...

AI Technical Summary

Problems solved by technology

However, the delayed cooling area of ​​the existing equipment is fixed and cannot be set arbitrarily, and the transition area between the soft and hard areas is relatively large, resulting in poor processing flexibility of the product

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