| 摘要 |
A superplastic forming system includes a free standing generally block-shaped ceramic monolithic die base having a bottom surface on which the die rests, and a top surface, opposite to the bottom surface, in which a forming cavity is formed and which is surrounded by a contact surface. The forming cavity has a shape like the desired shape of sheet metal parts to be formed by superplastic forming in the die. A die lid having a horizontal cross sectional shape and size approximately equal to the die base, and having a contact surface corresponding in size and contour to the die base contact surface is placed on the base with the contact surfaces aligning and in contact. The die base is formed of a ceramic material that provides sufficient compressive strength to resist a compressive load exerted by a press to hold the lid on the die against oppositely directed force generated by gas at superplastic forming pressures within the die, and provides sufficient tensile strength, when under pressure of compressive loads exerted by the press to resist internal bursting forces exerted by gas at superplastic forming pressures within the die. A press having upper and lower platens with substantially parallel upper an lower platen faces applies compressive force to the die placed therebetween. The press is preheated and the die is attached with attaching hardware to the press. Pressurized gas is delivered to the die cavity from a source through a gas conduit connecting the pressurized gas source to the die.
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