초록
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A beam with a hat-shaped profile with a cross-section that varies along its length is successively formed from a plane sheet metal strip using a roll-forming machine with a number of forming stations. The forming stations (11, 12) have a pair of clamping rollers (21, 22 and 23, 24) for each side flange (16, 17) and support rollers (25, 26) for the central flange. The pairs of clamping rollers in the forming stations can be displaced both horizontally and vertically during a forming operation, and the support rollers (25, 26) can be displaced vertically a...
A beam with a hat-shaped profile with a cross-section that varies along its length is successively formed from a plane sheet metal strip using a roll-forming machine with a number of forming stations. The forming stations (11, 12) have a pair of clamping rollers (21, 22 and 23, 24) for each side flange (16, 17) and support rollers (25, 26) for the central flange. The pairs of clamping rollers in the forming stations can be displaced both horizontally and vertically during a forming operation, and the support rollers (25, 26) can be displaced vertically and they can be displaced individually in a sideways direction. All four corners (27-30) of the hat-shaped beam are formed at the same time, whereby the corners are folded on the peripheral edges of the clamping rollers and support rollers. Not only the axes of the pairs of clamping rollers but also of the support rollers can be turned in order to adapt to the corners that are being formed.
대표
청구항
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1. A method for roll-forming from a plane sheet metal strip successively in a number of forming stations (11, 12) a hat beam with a profile that varies along its length, having a central flange (13), two webs (14, 15) and two side flanges (16, 17); the steps of said method comprising:clamping the portions of the metal sheet to be formed as the side flanges (16, 17) in the forming stations (11, 12) between a pair of clamping rollers (21, 22; 23, 24) and forming all four corners (27-30) of the hat beam at the same time between two pairs of said clamping ro...
1. A method for roll-forming from a plane sheet metal strip successively in a number of forming stations (11, 12) a hat beam with a profile that varies along its length, having a central flange (13), two webs (14, 15) and two side flanges (16, 17); the steps of said method comprising:clamping the portions of the metal sheet to be formed as the side flanges (16, 17) in the forming stations (11, 12) between a pair of clamping rollers (21, 22; 23, 24) and forming all four corners (27-30) of the hat beam at the same time between two pairs of said clamping rollers (21, 22 and 23, 24) and at least one support roller (25, 26) for forming the central flange (13),wherein the forming of all four corners of the hat beam at the same time between two pairs of said clamping rollers and at least one support roller for forming the central flange comprises folding the corners on peripheral edges of the clamping rollers, and on peripheral edges of the support rollers, such that the entire webs are extending freely between the respective corners, anddisplacing at least one of the pairs of clamping rollers and the at least one support roller during the forming process for changing the profile of the hat beam. 2. The method according to claim 1, characterised in that the pairs of clamping rollers (21, 22 and 23, 24) are displaced both horizontally and vertically during a forming operation. 3. The method according to claim 1, characterised in that the support roller or support rollers (25, 26) for the central flange (13) is or are displaced in a direction that is perpendicular to the central flange. 4. The method according to claim 1, characterised in that at least one said support roller (25, 26) is used for each corner (27, 28) of the central flange (13), and in that said at least one support roller is displaced in a sideways direction during a forming operation to vary the width of the central flange, whereby the support rollers are turned such that their axes (VII, VIII) are maintained perpendicular to the corners (28, 27) that make contact with the respective said support roller. 5. The method according to claim 4, characterised in that the pairs of clamping rollers (21, 22 and 23, 24) are turned such that their axes (I, II) are maintained perpendicular to the corner (28, 27) of the hat beam, and that a line between the axes of the pairs of clamping rollers is maintained perpendicular to the side flanges (16, 17). 6. The method according to claim 1, characterised in that said displacements of said clamping and support rollers are carried out by means of power devices that are controlled by a computer according to pre-programmed algorithms. 7. The method according to claim 1, characterised in that a metal strip unwound from a coil is introduced directly into a first said forming station and that edges of the strip are cut before or after the forming operation directly in association with the forming operation, and in that the strip is cut before or after the forming operation directly in association with the forming operation. 8. The method according to claim 2, characterised in that the at least one support roller (25, 26) for the central flange (13) is displaced in a direction that is perpendicular to the central flange. 9. The method according to claim 2, characterised in that at least one said support roller (25, 26) is used for each corner (27, 28) of the central flange (13), and in that said at least one support roller is displaced in a sideways direction during a forming operation to vary the width of the central flange, whereby the support rollers are turned such that their axes (VII, VIII) are maintained perpendicular to the corners (28, 27) that make contact with the respective said support roller. 10. The method according to claim 3, characterised in that at least one said support roller (25, 26) is used for each corner (27, 28) of the central flange (13), and in that said at least one support corner is displaced in a sideways direction during a forming operation to vary the width of the central flange, whereby the support rollers are turned such that their axes (VII, VIII) are maintained perpendicular to the corners (28, 27) that make contact with the respective said support roller. 11. The method according to claim 8, characterised in that at least one said support roller (25, 26) is used for each corner (27, 28) of the central flange (13), and in that said at least one support roller is displaced in a sideways direction during a forming operation to vary the width of the central flange, whereby the support rollers are turned such that their axes (VII, VIII) are maintained perpendicular to the corners (28, 27) that make contact with the respective said support roller. 12. The method according to claim 2, characterised in that said displacements of said clamping and support rollers are carried out by means of power devices that are controlled by a computer according to pre-programmed algorithms. 13. The method according to claim 3, characterised in that said displacements of said clamping and support rollers are carried out by means of power devices that are controlled by a computer according to pre-programmed algorithms. 14. The method according to claim 4, characterised in that said displacements of said clamping and support rollers are carried out by means of power devices that are controlled by a computer according to pre-programmed algorithms. 15. The method according to claim 2, characterised in that a metal strip unwound from a coil is introduced directly into a first said forming station and that edges of the strip are cut before or after the forming operation directly in association with the forming operation, and in that the strip is cut before or after the forming operation directly in association with the forming operation. 16. The method according to claim 3, characterised in that a metal strip unwound from a coil is introduced directly into a first said forming station and that edges of the strip are cut before or after the forming operation directly in association with the forming operation, and in that the strip is cut before or after the forming operation directly in association with the forming operation. 17. A roll-forming machine with a number of forming stations (11, 12) for successively forming from a plane sheet metal strip a hat beam, that has a central flange (13), two webs (14, 15) and two side flanges (16, 17) and a cross-section that varies along its length, characterised inthat the forming stations (11, 12) have a pair of clamping rollers (21, 22 and 23, 24) for the portions of the metal strip to be formed as the side flanges (16, 17) and at least one support roller (25, 26) for the portion of the metal strip to be formed as the central flange (13), and means for folding corners on peripheral edges of the clamping rollers and on peripheral edges of the support rollers such that the entire webs extend freely between the respective corners of the hat beam, the clamping roller pairs in the forming stations being arranged to be displaceable both horizontally and vertically during a forming operation. 18. The roll-forming machine according to claim 17, characterised in that the at least one support roller (25, 26) is displaceable in the vertical direction. 19. The roll-forming machine according to claim 18, characterised by two support rollers (25, 26) for the central flange located next to each other, and in that these support rollers are displaceable individually towards and away from each other, and turnable about axes (V, VI, resp.) perpendicular to the axes of the rollers. 20. The roll-forming machine according to claim 19, characterised in that each pair of clamping rollers (21, 22 and 23, 24) are turnable individually around two axes (III, IV) that are perpendicular to each other, one axis of which is parallel to the axes of the clamping rollers.
