초록 ▼

The invention relates to a riveting device (1) comprising a pressure pad (3) and a riveting die (4). Said pressure pad (3) and riveting die (4) can be hydraulically driven by means of a pressure pad piston (12) and a die piston (13). The aim of the invention is to further develop such a riveting dev

The invention relates to a riveting device (1) comprising a pressure pad (3) and a riveting die (4). Said pressure pad (3) and riveting die (4) can be hydraulically driven by means of a pressure pad piston (12) and a die piston (13). The aim of the invention is to further develop such a riveting device (1) in an advantageous manner. To this end, the pressure pad piston (12) and the die piston (13) are driven by the same hydraulic pressure, the effective piston area (36) of the pressure pad piston (12) being embodied in a smaller manner than the effective piston area (14) of the die piston (13).

대표청구항 ▼

1. A riveting unit (1) with a holding-down means (3) and a riveting die (4), the holding-down means (3) and the riveting die (4) driveable hydraulically by means of a holding-down piston (12) and of a die piston (13), characterized in that the holding-down piston (12) and the die piston (13) are act

1. A riveting unit (1) with a holding-down means (3) and a riveting die (4), the holding-down means (3) and the riveting die (4) driveable hydraulically by means of a holding-down piston (12) and of a die piston (13), characterized in that the holding-down piston (12) and the die piston (13) are activated by the same hydraulic pressure, the effective piston area (36) of the holding-down piston (12) being formed to be smaller than the effective piston area (16) of the die piston (13).2. The riveting unit as claimed in claim 1, characterized in that the holding-down piston (12) is disposed within the die piston (13), which is formed as an annular piston, and the holding-down piston (12) is coupled to the holding-down means (3) by engaging radially through the die piston (13).3. The riveting unit as claimed in claim 1, characterized in that the holding-down piston (12) and the die piston (13) are each biased in their starting position by means of a spring (19, 28), the spring (19) of the die piston (13) being set to a stronger setting than the spring (28) of the holding-down piston (12).4. The riveting unit as claimed in claim 3, characterized in that the springs (19, 28) are disposed concentrically in relation to one another.5. The riveting unit as claimed in claim 1, characterized in that the die piston (13) forms a central cylinder (23) in which the holding-down piston (12) is disposed.6. The riveting unit as claimed in claim 5, characterized in that a restoring spring (28) of the holding-down piston (12) is supported against a pressure-exerting disk (32), which is disposed in the inlet region of the cylinder (23) and leaves a through-passage (31).7. The riveting unit as claimed in claim 1, characterized in that the holding-down means (3) and the riveting die (4) are formed, over part of their length, as sleeve bodies (33, 21) which are disposed concentrically in relation to one another and can be displaced axially in relation to one another.8. The riveting unit as claimed in claim 7, characterized in that a cylinder (21) in which the holding-down piston (12) is guided has a hydraulic volume (58) which is shut off in an outward direction by means of valves (56, 57).9. The riveting unit as claimed in claim 8, characterized in that the valves (56, 57) are used to set a holding-down force (H) which is uniform until the riveting operation is carried out.10. A method of riveting two sheet-like elements (55) by means of a riveting device having holding-down means (3) and a riveting die (4), wherein in a first step the holding-down means (3) being moved into abutment against the elements (55) while, in a second step, the riveting die (4) is pressing a rivet into the elements (55), connecting the latter in the process, or is joining the elements directly to one another, characterized in that the holding-down force (H) is increased in dependence on the die force (N), but to a lesser extent.11. The method as claimed in claim 10, characterized in that the holding-down force (H) is increased starting from a level at the beginning exceeding the riveting-die force (N).