DE1054309B - Pneumatic or hydraulic hole and rivet press with counter pressure bar - Google Patents

Description

GERMAN

There are presses of various types have become known that are portable and where the inclusion of a counter-pressure bracket takes place through a stepped neck, the length of which corresponds to the bracket mount is equivalent to. With these brackets, the protection against tension is usually carried out by one or more Nuts or by means of locking rings or snap rings.

Furthermore, presses operated by pressure medium have become known, in which the in the direction of the tool longitudinal axis Adjustment to be made of the counter-pressure bar, which can be rotated about this axis, by means of an am Outside diameter of the strongly offset neck and one cut in the mounting hole of the bracket, strong thread takes place, with the protection against unintentional rotation by a lock nut is made. In these presses, the adjustment axis coincides with the longitudinal axis of the printing cylinder together.

However, this arrangement has the disadvantage that the bracket with the relevant pressure element in the axial Direction is firmly connected and can therefore not be moved. Furthermore, because of the deposed Neck diameter, only small and therefore relatively short pressure stamp inserts are used will.

The necessary different clear widths of the counterpressure bracket, however, require that both on the Different heights must be adhered to on the pressure ram side as well as on the horn side in order to achieve the occurring, different employment relationships to take into account. Let it be on the two extremes Cases referenced that can occur here:

Firstly, the total height of the horn end including the tool insert must be in the case of flange rivets of U and double T irons by twice the material thickness of the flange plus twice the height of the setting head of a rivet must be smaller than the web height of the relevant profile iron.

Second, it must be possible to carry out riveting or piercing work in the web of a high flange U-iron must be available, whereby the height of the insert in the horn of the counterpressure bracket must be so large like the flange height of the U-iron.

The two borderline cases cited therefore require the tool inserts in the horn to be replaced. Accessibility also requires, in addition to the flange or web heights, protruding cast steel elements or the like to be bridged, so that long inserts are necessary on the setting head side and on the pressure ram side. Such long punch inserts require a "root" diameter that is dependent on the length.
and rivet press with counter pressure bracket

Applicant:

Frankfurter Maschinenbau-Aktiengesellschaft
vorm. Pokorny & Wittekind,
Frankfurt / M., Solmsstr. 2-26

Maurus Glas, Frankfurt / M.,
has been named as the inventor

so Bügels could not be reached. Due to the need to purchase a second counter pressure bracket There were significant and inevitable costs arising from duplication and loss of time the production, storage and replacement both at the manufacturer and the user of the Rivet press revealed. These costs are eliminated when using the counter-pressure bar according to the invention; the other disadvantages mentioned do not arise either.

The essential feature of the invention is that the counter pressure bracket with a bore is guided on the pressure cylinder displaceably and lockable. This creates a wide range of possible uses the press achieved without about the length of the printing cylinder having to be increased. The axial displacement or setting of the counter pressure bracket also has the task of To reduce the stroke of the tool, whereby the production time of the workpieces is shortened.

It is also achieved that the largest possible bores for receiving the plunger and tool inserts are available, from which it follows that according to the buckling formula: length = 5 times diameter, even relatively long deployments can be used.

Furthermore, the implementation according to the invention allows the arrangement of a both rotatable and pivotable bracket, namely about an axis A ... A offset by 90 ° with respect to the pressure stamp axis B ... B (Fig. 3). This ensures that the two extreme positions that occur and all intermediate positions are possible in the fastest working sequence, ie with only slight loss of time, of counter-pressure brackets with a low and a large horn.

809 788/115

Claims (3)

The above-mentioned advantages achieved by the arrangement and design of the counter-pressure bracket according to the invention were not exhibited by the known rivet press constructions. Another advantage is that instead of a high and low horn for riveting work, tools for another work application can also be used in a pivotable double counterpressure bracket, for example for punching. In this case, the guide of the particular tool to be used is provided from the outset in brackets. There is also the option of using two opposite or more star-shaped brackets instead of a single bracket, which can be pivoted in and determined similar to a turret head, for example on a cutting machine tool, so that the tool intended for a specific operation is in each case Od. Like. Is in working position. The counter-pressure bar can be secured against unintentional displacement in the axial direction by means of retaining rings or flat nuts. The invention is illustrated by Figures 1 to 5, for example. Fig. 1 shows the arrangement of a counter pressure bracket 1 with a high insert tool 8 on the horn side of the bracket 1 and the schematic indication of the riveting of two U-irons to the webs by means of a riveting tool, which is driven by a pressure cylinder arranged in the receiving bore 2 of the bracket 1 3 is actuated, Fig. 2 the arrangement of the same counter-pressure bracket 1 with a lower insert tool 9 on the horn side of the bracket 1 and the schematic indication of the riveting of a U-iron flange with a long-legged angle plate, Fig. 3 an embodiment corresponding to Fig. 1 , but instead of the individual counter-pressure bracket 1 with a double bracket 1 ', 1 "which can be pivoted about the pin 4, the two horns 10 and 11 of which are offset from one another by 180 ° 180 ° pivoted double bracket 1 ', 1 "to achieve the function of the press of Fig. 2, Fig. 5 a double bracket 1'" with identical horns Forms 7 and 7 ', but for different types of work, for example for riveting (left side) and for punching (right side) a workpiece. In this arrangement, guide cylinders 6, 6 'are provided for the tools 7 and 7' in bores 5 of the double bracket 1 '", which can also be used analogously in the presses according to Figs. 1 and 2. Patent claims: 1. Pneumatic or hydraulic hole and rivet press with one in the direction of the tool's longitudinal axis adjustable and rotatable about this axis counter-pressure bracket, the adjustment axis coincides with the longitudinal axis of the pressure cylinder, characterized in that the counter-pressure bracket (1) guided with a bore (2) on the pressure cylinder (3) displaceably and lockable is. 2. Press according to claim 1, characterized in that the bore is located in an intermediate piece which has a pin (4) perpendicular to the adjustment axis (B ... B) , on which a hub with several opposing or star-shaped arranged, unequal long or different counter pressure brackets (IM ") is pivotable. 3. Press according to claim 1 or 2, characterized in that each counter-pressure bracket (V ") has an additional bore (5) for guiding the movable tools (6, T) . Considered publications:
French Patent No. 885 420;
British Patent No. 313 081;
U.S. Patent No. 2,335,917. 1 sheet of drawings © 809788/115 3.59