초록 ▼

A pair of sheets of a metal capable of exhibiting superplasticity, such as Titanium, are placed in overlapping relationship and the peripheral edges of the sheets are joined, such as by welding, to provide a gas impervious seal. The joined metal sheets are lowered into a press so that they extend ve

A pair of sheets of a metal capable of exhibiting superplasticity, such as Titanium, are placed in overlapping relationship and the peripheral edges of the sheets are joined, such as by welding, to provide a gas impervious seal. The joined metal sheets are lowered into a press so that they extend vertically between a pair of horizontally spaced apart, vertically extending preheated ceramic dies. The dies are previously transferred inside insulating shrouds from a preheater station before being loaded into the press. At least one of the dies is moved horizontally toward the other one of the dies so that the joined metal sheets are positioned closely adjacent to the dies. As a result, the metal sheets are heated to a predetermined temperature at which they are capable of exhibiting superplasticity. Thermostatically controlled heating platens behind the dies offset any heat losses in the dies as they radiate energy to the joined metal sheets. Thereafter a pressurized gas, such as Argon, is introduced between the joined metal sheets so that they are pushed outwardly against corresponding ones of the dies and formed against the same. At least one of the dies is thereafter moved horizontally away from the other one of the dies and the formed metal sheets are lifted out of the press. The formed metal sheets are then transferred to a cooling station. Once cooled, the formed metal sheets are cut apart to produce two or more formed pieces.

대표청구항 ▼

A method of dual super plastic forming comprising the steps of: selecting a pair of sheets of a metal capable of exhibiting superplasticity; placing the sheets in overlapping relationship and joining the peripheral edges of the sheets to provide a gas impervious seal; lowering the joined metal sheet

A method of dual super plastic forming comprising the steps of: selecting a pair of sheets of a metal capable of exhibiting superplasticity; placing the sheets in overlapping relationship and joining the peripheral edges of the sheets to provide a gas impervious seal; lowering the joined metal sheets into a press so that they extend vertically between a pair of horizontally spaced apart, vertically extending heated dies; moving at least one of the dies horizontally toward the other one of the dies so that the joined metal sheets are positioned closely adjacent to the dies; allowing the metal sheets to be heated to a predetermined temperature at which they will be capable of exhibiting superplasticity; introducing a pressurized gas between the joined metal sheets so that the sheets are pushed outwardly against corresponding ones of the dies and formed against the same; moving at least one of the dies horizontally away from the other one of the dies and lifting the formed metal sheets out of the press; and cutting the formed metal sheets apart to produce two formed pieces.