Method for quick gas bulging forming of hot metal sheet

Abstract

Provided is a method for quick forming of a hot metal sheet. The method relates to a technology for forming a metal sheet part, and solves the problem that the existing hot metal sheet forming technology cannot ensure that a blank is deformed under reasonable temperature and pressure conditions, thereby failing to realize precise and quick forming of a complex metal sheet part, especially a thin-walled part. The method mainly includes the following steps: step one, placing a metal sheet blank to be formed on a forming mold; step two, introducing high-pressure gases with equal pressures simultaneously into upper and lower enclosed cavities respectively formed by the metal sheet blank and the sealing mold, and the metal sheet blank and the forming mold; step three, heating the metal sheet blank to a preset forming temperature condition; step four, quickly releasing the high-pressure gas from the cavity formed by the metal sheet blank and the forming mold, such that the metal sheet blank bulges; and step five, discharging the gas from the cavity formed by the metal sheet blank and the sealing mold, and opening the mold to obtain a formed metal sheet part. The present invention is used for manufacturing a metal sheet part.

What is claimed is: 
     
         1 . A method for quick gas bulging forming of a hot metal sheet, wherein the method is implemented according to the following steps:
 step one, placing a metal sheet blank to be formed on a forming mold, and closing a sealing mold to form enclosed cavities on upper and lower surfaces of the metal sheet blank;   step two, introducing high-pressure gases with equal pressures simultaneously into upper and lower enclosed cavities respectively formed by the metal sheet blank and the sealing mold, and the metal sheet blank and the forming mold;   step three, heating the metal sheet blank to a preset forming temperature condition;   step four, quickly releasing the high-pressure gas from the enclosed cavity formed by the metal sheet blank and the forming mold, such that the metal sheet blank bulges quickly under the action of the high-pressure gas at the other side and thus fits into the mold cavity of the forming mold; and   step five, discharging the gas from the cavity formed by the metal sheet blank and the sealing mold, and opening the sealing mold to obtain a formed metal sheet part.   
     
     
         2 . The method for quick gas bulging forming of a hot metal sheet of  claim 1 , wherein the heating of the metal sheet blank in step three is conducted through contact heating using a hot steel plate. 
     
     
         3 . The method for quick gas bulging forming of a hot metal sheet of  claim 1 , wherein in step four, multiple non-uniformly distributed vent holes are opened at the bottom of the forming mold, a first vent hole is located on the left side of the cavity, and a second vent hole and a third vent hole are located on the right side of the cavity. 
     
     
         4 . The method for quick gas bulging forming of a hot metal sheet of  claim 2 , wherein in step four, multiple non-uniformly distributed vent holes are opened at the bottom of the forming mold, a first vent hole is located on the left side of the cavity, and a second vent hole and a third vent hole are located on the right side of the cavity. 
     
     
         5 . The method for quick gas bulging forming of a hot metal sheet of  claim 3 , wherein in step four, a gas regulating valve is further provided on the multiple vent holes opened at the bottom of the forming mold, and a deflation speed of each vent hole can be adjusted by the gas regulating valve. 
     
     
         6 . The method for quick gas bulging forming of a hot metal sheet of  claim 4 , wherein in step four, a gas regulating valve is further provided on the multiple vent holes opened at the bottom of the forming mold, and a deflation speed of each vent hole can be adjusted by the gas regulating valve. 
     
     
         7 . The method for quick gas bulging forming of a hot metal sheet of  claim 1 , wherein in steps one to five, both the sealing mold and the forming mold are at a temperature condition of room temperature, and the metal sheet blank is also at room temperature before being placed into the mold, and in step three, the metal sheet blank is quickly heated by an electrode provided thereon. 
     
     
         8 . The method for quick gas bulging forming of a hot metal sheet of  claim 2 , wherein in steps one to five, both the sealing mold and the forming mold are at a temperature condition of room temperature, and the metal sheet blank is also at room temperature before being placed into the mold, and in step three, the metal sheet blank is quickly heated by an electrode provided thereon. 
     
     
         9 . The method for quick gas bulging forming of a hot metal sheet of  claim 5 , wherein in steps one to five, both the sealing mold and the forming mold are at a temperature condition of room temperature, and the metal sheet blank is also at room temperature before being placed into the mold, and in step three, the metal sheet blank is quickly heated by an electrode provided thereon. 
     
     
         10 . The method for quick gas bulging forming of a hot metal sheet of  claim 6 , wherein in steps one to five, both the sealing mold and the forming mold are at a temperature condition of room temperature, and the metal sheet blank is also at room temperature before being placed into the mold, and in step three, the metal sheet blank is quickly heated by an electrode provided thereon.