CH637312A5 - Wobble riveting. - Google Patents

Description

637 312

PATENT CLAIM: Wobble riveting machine with a device for automatic feeding and setting of the rivets, which has a rivet separator with a feed channel and holding pliers, with rivet punches mounted in a spindle head, which can be tilted against its axis by means of an adjusting drive, the axis of the spindle head and rivet plunger being in the center in any angular position cut the deformation surface of the rivet punch, characterized in that a rotatable bearing bush (5) for the rivet punch (6, 13, 14) is provided in the spindle head (2) and a spring-loaded centering pin is arranged in the latter, the axis of rotation (x) of the spindle head (2) is at an invariable, acute angle (a) to the axis of rotation (y) of the bearing bush (5), in the latter the rivet punch (6, 12, 13, 14) is at the same invariable angle (a) to the axis of the bearing bush ( 5) is inclined and freely rotatable, the axis of rotation (y) of the bearing bush (5) also through the intersection (PI) of the axes (x, z) vo n Spindle head (2) and rivet punch (6, 12, 13, 14) and for rotating the bearing bush (5) by 180 ° with respect to the spindle head (2) about its axis (y), one acting in the direction of the spindle head axis (x), the actuator (7) actuating rod (8,9) is provided.

The invention relates to a wobble riveting machine according to the preamble of the claim.

Such a riveting machine is already known from DE-PS 2 455 452, specifically in an embodiment with rivet dies mounted in a spindle head and tiltable against its axis by means of an adjustment drive, the axes of the spindle head and rivet die being in the angular position in the center of each Cut the deformation surface of the rivet punch. In such a device, as the illustration of the document in question clearly shows, the actual riveting die thus carries out a continuous, loop-like wobble movement throughout the entire machining process, without any standstill phase in the center. Although a riveting machine designed in this way delivers absolutely flawless work results, there is a considerable disadvantage in that an automatic rivet feed while the machine is running is not possible due to this constant wobbling movement of the riveting die.

Here, the present invention relates to the task of developing a wobble riveting machine of the type mentioned at the beginning in such a way that an automatic rivet feed, which can only be carried out when the riveting die and rivet are in an axially aligned position, is possible.

This object is achieved with the means and structural measures specified in the characterizing part of the single patent claim, which cause the riveting machine to run outside the riveting process like a normal riveting machine, i.e. with its tools, in an axially aligned direction and only after the rivet has been supplied by mechanically turning the rivet Rivet stamp for riveting is switched to a wobble movement.

The special advantages of the wobble riveting machine are essentially the following:

a) No additional tool for centering the rivet and workpiece is necessary, because the workpiece is centered directly in the rivet hole.

b) A significantly shorter riveting time is achieved by the automatic rivet feed using the single-stroke process.

c) A quick changeover to other rivet sizes or rivet shaft diameters is possible by simply changing the punch unit.

d) The rivet feed takes place coaxially to and directly above the rivet die and during the non-wobbling phase thereof.

An exemplary embodiment according to the invention is shown in the drawing and described in more detail below.

It shows:

1 the wobble riveting machine according to the invention in the basic structure as a perspective view,

2 the rivet feed system,

Fig. 3 shows a longitudinal section through the area of the riveting tool in the receiving position and

Fig. 4 the same in the working position.

1 and 2 consists essentially of the machine body or stand 1 with control box la, height adjustment lb, micrometer sleeve lc for the depth stop, sorting cylinder 17 with feed channel 18 and separator 19 for the rivets 24. The holding pliers 20, the ram 21, driven by the pneumatics 22, complete the general basic structure.

3 and 4 has the following element structure:

The spindle head 2 is supported in the machine body 1 via roller bearings 1d. This spindle head 2 is constant, for. B. driven by an electric motor 4 via a toothed belt 3. In the spindle head 2, a bearing bush 5 is also mounted on roller bearings 5a at an angle a (approx. 2.5 °). The intersection of the two axes is the pole PI, the so-called Döppermulde. An unintentional adjustment of the spindle head 2 and the bearing bush 5 during rotation is prevented by the bevel gear drive 7 via the rack 8 and gear 9. The rack 8 is held down by a pneumatic bearing 11, which is attached to the machine body 1, via a ball bearing 10. The rivet punch 6 has a resilient pin 12 which is adapted in diameter to the respective rivet shaft. The pin 12 is supported on the set screw 13 and is secured by lock nuts 14. Above the rivet punch 6 there is a resilient table level or the plate 15, which is pressed upwards with the compression springs 16. The automatic rivet feed 17, 18, 19 is located coaxially above the rivet head.

Via a sorting container 17 or a similar sorting device, the rivets are sorted in the correct position and guided in the connecting channel 18 until they are separated. From there, a rivet 24 falls into the rivet pliers 20 and is held here on the rivet shank. The pliers 20 are located in the plunger 21, which is guided in the machine body 1 and is driven by a pneumatic cylinder 22.

The workflow and the function of this device take place as follows:

After the workpiece 23 to be riveted has been placed over the resilient pin 12 and is supported on the plate 15, the rivet pliers 20 moves with the rivet down to the pin 12, pushes it downward, and via the plunger 21 it becomes Workpiece on table 15 pressed down until rivet shaft 24 has reached trough PI of rivet punch 6.

The rack 8 now moves upwards via an electrical or pneumatic contact or limit switch 25, the bearing bush 5 in the spindle head 2 being rotated through 180 ° via the bevel gear drive 7; thus the rivet punch axis z has also rotated about the pole PI, and this axis

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z has reached the angle of twice a with respect to the spindle axis x, which enables wobble riveting.

After finished riveting, the pliers 20 move upwards, a new rivet 24 falls in and the bearing bush 5 swivels back into its old position relative to the spindle head 2, as a result of which the resilient pin 12 thus runs coaxially with the spindle head axis x and a new workpiece can be inserted .

The pin 12 or its retraction and extension can be effected in a technically equivalent manner, instead of using a spring, hy-5 drastically, pneumatically, electromagnetically or the like.

4 sheets of drawings