Process for the monolithic molding of superplastic material

Abstract

In the process for the monolithic molding of superplastic material, generation of wrinkles on the molded product can be prevented by avoiding local expansion generated in the no-bonding regions of both of three or more metal plates when the metal plates are monolithically molded by means of superplastic molding. The process is characterized in that auxiliary plates for molding are placed on both sides of the superposed plates through the no-bonding regions, these plates are set in the molding die, and a pressure lower than applied to the non-bonding regions is applied to spaces between inner wall of the molding die and the auxiliary plates to control movement of the top and bottom.

I claim:  
     
         1 . A process for the monolithic molding of superplastic material comprising: 
 providing at least three metal plates capable of superplastic molding and diffusion bonding,    applying an anti-bonding agent onto regions of the plates to define bonding regions and non-bonding regions on the plates, bonding regions and non-bonding regions provided between the plates,    superposing the metal plates one on another to form superposed plates,    setting the superposed plates in a molding die, and    heating the molding die interior to a molding temperature to diffusively bond superposed portions of the superposed plates to each other, the superposed portions corresponding to the bonding regions, and superplastically molding the metal plates by introducing a gas into the non-bonding regions to apply pressure to the regions;    wherein auxiliary plates for molding are placed on top and bottom sides of the superposed plates through the anti-bonding layer, respectively, the superposed plates and the auxiliary plates are set in the molding die, and a pressure lower than pressure applied to the non-bonding regions is applied to spaces between inner wall of the molding die and the auxiliary plates to control movement of the top and bottom plates whereby the superplastic molding is performed.    
     
     
         2 . The process for the monolithic molding of superplastic material as defined in  claim 1 , the anti-bonding agent is coated onto outer surfaces of the auxiliary plates for molding.  
     
     
         3 . A process for the monolithic molding of superplastic material comprising: 
 providing at least three metal plates capable of superplastic molding,    applying an anti-bonding agent onto regions of the plates to define bonding regions and non-bonding regions on the plates, bonding regions and non-bonding regions provided between the plates,    bonding the portions corresponding to the bonding portion of the plates one on another to form superposed plates,    setting the superposed plates in a molding die, and    heating the molding die interior to a molding temperature to superplastically molding the metal plates by introducing a gas into the non-bonding regions to apply pressure to the regions;    wherein auxiliary plates for molding are placed on top and bottom sides of the superposed plates through the anti-bonding layer, respectively, the superposed plates and the auxiliary plates are set in the molding die, and a pressure lower than pressure applied to the non-bonding regions is applied to spaces between inner wall of the molding die and the auxiliary plates to control movement of the top and bottom plates whereby the superplastic molding is performed.    
     
     
         4 . The process for the monolithic molding of superplastic material as defined in  claim 3 , the anti-bonding agent is coated onto outer surfaces of the auxiliary plates for molding.  
     
     
         5 . A process for the monolithic molding of superplastic material comprising: 
 providing at least three metal plates capable of superplastic molding and diffusion bonding,    applying an anti-bonding agent onto regions of the plates to define bonding regions and non-bonding regions on the plates, bonding regions and non-bonding regions provided between the plates,    superposing the metal plates one on another to form superposed plates,    setting the superposed plates in a molding die, and    superplastically molding the metal plates by introducing a gas into the non-bonding regions to apply pressure to the regions;    wherein a groove connecting an end portion of one plate of the superposed plates to one of the non-bonding regions is provided on the one plate, a stainless pipe having no superplasticity is fitted into the groove, periphery of the pipe is sealed, all the plates constituting the superposed plates are superposed one on another and pressure is applied by introducing the inner gas into the stainless tube.