초록 ▼

A hydroforming apparatus capable of deforming relatively large and thick-walled workpieces, yet which is relatively small, simple, and inexpensive in construction and operation, includes a pressure vessel that is disposed within a frame. The pressure vessel includes upper and lower vessel members th

A hydroforming apparatus capable of deforming relatively large and thick-walled workpieces, yet which is relatively small, simple, and inexpensive in construction and operation, includes a pressure vessel that is disposed within a frame. The pressure vessel includes upper and lower vessel members that support respective die sections therein. When the upper and lower vessel members are moved adjacent to one another, the die sections cooperate to define a die cavity in which a workpiece to be hydroformed is disposed. An inflatable bladder is disposed between one or both of the die sections and the associated upper and lower vessel members. During the hydroforming operation, pressurized fluid is introduced within the workpiece so as to expand it outwardly into conformance with the die cavity defined by the die sections. At the same time, pressurized fluid is introduced into the inflatable bladder, causing it to expand between the die sections and the associated upper and lower vessel members. The inflatable bladder allows for limited expansion of the upper and lower vessel members while preventing relative movement between the die sections. As a result, the size, complexity, and cost of the hydroforming apparatus can be maintained at a minimum, while facilitating the hydroforming of relatively large and thick-walled workpieces, such as vehicle frame components.

대표청구항 ▼

[ What is claimed is:] [1.] A pressure vessel for use in a hydroforming apparatus comprising: first and second vessel members;first and second die sections respectively supported within said first and second vessel members, said first and second die sections having respective cavity portions formed

[ What is claimed is:] [1.] A pressure vessel for use in a hydroforming apparatus comprising: first and second vessel members;first and second die sections respectively supported within said first and second vessel members, said first and second die sections having respective cavity portions formed therein that cooperate to define a die cavity adapted to receive a workpiece therein; anda bladder disposed between said first vessel member and said first die section, said bladder adapted to exert a force against said first vessel member for urging said first vessel member into engagement with said second vessel member.