Device for shaping a metal sheet by die stamping
View Patent ↗A device for shaping a metal sheet by die stamping, the device including first and second trunnions configured to be fastened respectively to two opposite ends of a sheet, the sheet being configured to be shaped by die stamping, wherein the first and second trunnions define respective first and second bearing surfaces configured respectively to guide turning of the trunnions, the first bearing surface defining a peripheral groove around a pivot axis of the first trunnion while the second bearing surface is smooth along a pivot axis of the second trunnion.
1. A device for shaping a metal sheet by die stamping, the device comprising:
first and second trunnions configured to be fastened respectively to two opposite ends of a sheet, the sheet adapted to be shaped by die stamping,
wherein the first trunnion defines a first bearing surface and the second trunnion defines a second bearing surface, the first and second bearing surfaces configured respectively to guide turning of the trunnions, and
wherein the first bearing surface defining a peripheral groove around a pivot axis of the first trunnion while the second bearing surface is smooth along a pivot axis of the second trunnion, thereby allowing the second trunnion to move in translation along the pivot axis of the second trunnion and preventing the first trunnion from moving in translation along the pivot axis of the first trunnion.
2. A device according to claim 1 , wherein each of the first and second trunnions includes a respective slot oriented along the respective pivot axis of the respective trunnion, the slot being configured to receive a portion of the sheet.
3. A device according to claim 2 , wherein each trunnion is fitted with a pin extending across the slot.
4. A device according to claim 1 , further comprising:
two first columns, each first column extending along a main axis substantially perpendicular to the pivot axis of the first trunnion, the first columns being configured to receive the first trunnion therebetween, the two first columns arranged on either side of the first trunnion in the peripheral groove to prevent the first trunnion from moving in translation in a direction perpendicular to the main axes and to the pivot axis, and to prevent the first trunnion from moving in translation along the pivot axis of the first trunnion.
5. A device according to claim 4 , wherein each of the two first columns presents a chamfered top end defining first, second, and third flats, the two first flats defining a V-shaped space between the first flats, whereas the second and third flats of a given column are opposite relative to the main axis of the column so that a top end of the column tapers.
6. A device according to claim 1 , further comprising:
two second columns, each second column extending along a main axis substantially perpendicular to the pivot axis of the second trunnion, the second columns being configured to receive the second trunnion therebetween, the second columns being arranged on either side of the second trunnion to prevent the second trunnion from moving in translation in a direction perpendicular to the main axes and to the pivot axis, while allowing the second trunnion to move in translation along the pivot axis of the second trunnion.
7. A device according to claim 6 , wherein each of the second columns presents a chamfered top end defining two respective flats, the two respective flats defining a V-shaped space therebetween.
8. A device according to claim 1 , further comprising top and bottom dies configured to receive the sheet therebetween and to shape the sheet by the dies moving towards each other, the top and bottom dies including cavities for receiving the trunnions and any columns while the dies move towards each other.
9. A device according to claim 1 , wherein the first trunnion presents four fins extending in a plane perpendicular to the pivot axis of the first trunnion.
10. A device according to claim 9 , wherein a central body of the first trunnion and a first pair of the tins define a first notch, the central body of the first trunnion and a second pair of the tins define the second notch, and the first and second notches define the peripheral groove of the first trunnion.
11. A device according to claim 1 , wherein the second trunnion comprises a cylindrical peg defining a cylindrical side surface of revolution about the pivot axis of the second trunnion as an axis of revolution of the cylindrical side surface.
12. An assembly comprising a sheet adapted to be shaped by die stamping and a device according to claim 1 .
13. An assembly according to claim 12 , wherein the sheet includes two tongues extending from opposite ends of the sheet, the tongues being configured to be inserted in respective slots of the trunnions.