Press for holding and pressing a workpiece
View Patent ↗The press of the invention includes a first component and a second component for holding and pressing a workpiece to be processed between them, the first component being driven into translation relatively to the second component by an air cylinder. Thus, the first component is floatably mounted relatively to the second component, said components comprising means for positioning them relatively to each other at the limit of travel. Proper centering of the workpiece between the components, without stresses, may thereby be provided.
1. A press comprising:
a lower component and an upper component configured to hold and press a workpiece to be processed between the upper and lower components, the lower component being driven into translation relative to the upper component by driving means to a position where the lower component and the upper component are pressed against each other,
wherein said driving means includes an air cylinder and the lower component is mounted on the air cylinder so as to float relatively to the upper component and said lower and upper components include means for positioning the lower and upper components relatively to each other when the lower and upper components near each other.
2. The press according to claim 1 , comprising means for translationally guiding the lower component, a play being provided between the lower component and the guiding means.
3. The press according to claim 2 , comprising at least one ring integral with the lower component and configured to slide on one column, play being provided between the ring and the column.
4. The press according to claim 1 , wherein the lower component and the upper component each comprise a die for holding and pressing the workpiece.
5. The press according to claim 4 , wherein the positioning means of the lower component comprise at least one positioning finger configured to cooperate with a bore.
6. The press according to claim 5 , wherein the die of the lower component comprises the at least one positioning finger and the die of the upper component comprises the at least one bore.
7. The press according to claim 6 , wherein each positioning finger comprises a portion with a cylindrical shape and a portion with a frusto-conical shape.
8. The press according to claim 4 , wherein each component comprises a platen and a heating insulating support supporting the die.
9. The press according to claim 8 , wherein at least one thermal insulating layer is positioned at the periphery of the dies.
10. The press according to claim 9 , wherein at least one heating insulating support comprises heating resistors.
11. The press according to claim 10 , wherein the heating resistors are contained in cartridges.
12. The press according to claim 10 , wherein the heating resistors are embedded and crimped in the heating insulating support.
13. The press according to claim 1 wherein the air cylinder includes a bellows.
14. The press according to claim 1 , positioned vertically, wherein the lower component is located in a lower position, and the upper component is located in an upper position.
15. The press according to claim 14 , including at least one spacer for supporting the lower component in one position, and second means for driving into translation the upper component relatively to the lower component.
16. The press according to claim 15 , wherein the second translation driving means comprise a hydraulic cylinder.
17. The press according to claim 16 , wherein the spacer is removable.
18. The press according to claim 15 , wherein the driving means for the lower component is configured to center the workpiece and the driving means of the second component is configured to press the workpiece.
19. A method for thermally straightening out a workpiece formed by forging, comprising:
inserting the workpiece into the press of claim 1 ; and
driving the lower component toward the upper component.
20. The method of claim 19 , wherein the workpiece is a turbine engine blade.
21. The press according to claim 1 , wherein the driving means is configured to drive the lower component along a predetermined distance, and
the means for positioning is configured to position the lower and upper components only at one end of the predetermined distance.
22. The press according to claim 21 , wherein the lower component is configured to float in six different directions.
23. The press according to claim 1 , wherein the means for positioning positions the lower component relative to the upper component translationally and rotationally around a plane perpendicular to a direction of motion of the air cylinder.