DE1205360B - Hydraulic clamping body for fastening tools on forging machines and presses - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
File number:
Registration date:
Display day:

B 23 k

German EL; 49h-6

1205 360
W29498Ib / 49h
17; February 1961
November 18, 1965

Hydraulic clamping body for fastening
of tools on forging machines
and pressing

Applicant: ...

Günter Wünsche, Altenhündem, Wimberg 15

Named as inventor;

Günter Wünsche, elderly dogs

The invention relates to one for attaching tools to forging machines and Press specific, hydraulic clamping body working according to the known expanding mandrel principle, which is designed as a hollow body designed with hydraulic fluid filling and in the tensioning direction, having elastically yielding cavity walls, the clamping pressure being achieved by moving a piston is created in a 'non-expandable cylinder part by means of a screw,

It is already one of an undivided, tubular Body of existing hydraulic clamping wedge proposed, the elastically bulging side

a flattened pipe part a lower '■ : ——: -: ■

Wall thickness than the other tube sides and where 15 y .

in the non-expandable pipe part with a screw ■

connected piston for pressure adjustment create, with which in a structurally simple manner one is arranged bar. . ' reliable, long-lasting and in their effect

With this training there is the disadvantage that .trolliefbare attachment of the clamped Arbeitsbei a device exposed to strong vibrations is reached, '"

machine, leaks and pressure fluctuations. Accordingly, the invention is seen in that

Clamping wedge occur, which its clamping effect and a spring between the screw and the piston the attachment of the working device, e.g. a rank is switched on, which is expediently made of a plate die, cancel, whereby not only the machine consists of spring packs that slide on one in the piston but also the operator in a considerable 35 guided, end-capped pole-on manner are at risk. are ordered. To avoid any change in the im

There are also hydraulic clamping wedges known, hollow body prevailing liquid pressure immediately The piston can make the two rigid bar halves and one between them visible to the outside consist of this enclosed expandable bladder. be provided with a pin, which by central apart from the fact that the clamping wedge does not have 30 holes in the piston rod and the screw on all sides forms closed bodies, are guided by the outside and the respective internal pressure

indicates more or less protruding from the end face of the screw.

An exemplary embodiment of the subject matter of the invention is shown in the drawing. It shows

A b b. 1 in a schematic representation the loading

elastically stretchable material existing bladder <lie mentioned disadvantages occurring in the event of a leak or damage to an increased extent available.

In the case of a clamping wedge consisting of a tubular hollow body, it is known on its clamping surface to arrange a larger number of holes having only a small diameter, in each of which a bolt serving as a piston leads itself through the hydraulic fluid pressed into the cavity be pressed against the tool to be fastened. However, such a clamping wedge is

consolidation of a lower die,

Fig. 2 shows a longitudinal section of the clamping body in larger scale,

Fig. 3 shows a cross section along the line AA in Fig. 2.

In the anvil 1 of a forging machine or the like, a e.g. working device consisting of a lower die

not only uneconomical to manufacture and

Assembly, but also requires a permanent and 45 used. The proposed clamping body consists careful monitoring, because as a result of the multitude of a hollow part 4 with an approximately square

Cross-section. The upper and lower walls 5 and 6 respectively have a strong cross-section, while the lateral Wall parts 7 and 8 are relatively thin-walled, so that when on the a pressure is exerted in the interior of the part 4 liquid, elastic to the outside towards-

509 738/197

the small pressure bolts and the associated sealing sleeves, there is a risk of leaks and the associated consequences is particularly great.

The invention aims to avoid these disadvantages and a hydraulic clamping body

can give. The yielding walls 7, 8 can, as shown in Fig. 3 in two versions, either have smooth surfaces or for the purpose of Enlargement of the effective surface can be deformed in a bead or wave shape. S.

In the hollow part 4 is at a certain distance from the inner walls one for guiding a piston 11 serving cylindrical sleeve 10 screwed in; the one at the inner end for the hydraulic fluid to pass through is open. The piston 11, which is provided with seals 13, has an axial longitudinal bore 14 for sliding Receiving a piston rod 15, against the collar-like widened end surface 16 of which in the cylinder 10 screwable pressure spindle 17 is supported.

On the part located between the piston 11 and the collar 16 there are a plurality of the piston rod 15 of spring assemblies that support each other in their effect and consist of individual disc springs 20 arranged one behind the other, which are stretched with increasing pressure resistance of the liquid.

The 'piston rod 15 and the coaxially lying pressure spindle 17 are each with a central longitudinal, provided a hole in which a signal pin 22 leads, the front end 23 of which is fixed in the piston 11, while the rear end 24 depending on the respective strength of the liquid pressure protrudes more or less far from the square head 25 of the spindle 17 to the outside, so that a any pressure loss can be seen and compensated for by simply tightening the spindle 17 can be.

The invention is not limited to the illustrated embodiment. So can instead of the disc springs another suspension may be provided. The clamping body can also be used to fasten others Tools or other objects are used, adapting them to their spatial shape accordingly is trained. For example, a fixed clamping connection can be two concentrically cylindrical Body can be achieved by a cavernous body designed in the manner of a hollow cuff, which is connected to an outside, arranged and acting on the liquid pressure device is. -.

Claims (4)

Patent claims: 1. Hydraulic clamping body for fastening tools on forging machines and Pressing, which is designed as a hollow body with hydraulic fluid filling and in the clamping direction having elastically yielding cavity walls, the clamping pressure being achieved by moving a piston is produced in a non-expandable cylinder part by means of a screw; characterized, that a suspension is switched on between the screw (17) and the piston (11). 2. Hydraulic clamping body according to claim 1, characterized in that the suspension consists of disk spring assemblies (20) which are arranged on a rod (15) which is slidably guided in the piston (11) and provided with end collars (16) are. ■ · 3. Hydraulic clamping body according to claim 2, characterized in that the piston (11) is provided with a pin (22) which through central bores of the rod (15) and the Screw (17) is guided into the open. 4. Hydraulic clamping body according to claim 1, characterized in that the yielding Hollow wall (8) wave-shaped or bead-shaped. is trained. Considered publications:
German Patent Nos. 1 056 904, 943 872, 563. Older patents considered:
German Patent No. 1106 583. For this purpose, 1 sheet of drawings «M 738/197 11.65 © Bundesdruckerei Berlin