DD267688A1 - BACKREST STRAIGHT TORQUE AND STATION ELEMENT - Google Patents

Abstract

Restrictive clamping and support element for distortion-free clamping and / or support of thin-walled and distortion-sensitive workpieces during machining in machine tools. The element is provided with a hydraulic drive and designed as a wedge gear and has compression springs. Rolling elements arranged between the wedge surfaces reduce the friction forces.

Description

For this 2 pages drawings

Field of application of the invention

The field of application of the invention extends to a restoring rigid clamping and support element for ien preferred use in machine tools.

As a special field of application are clamping devices for thin-walled and distortion-sensitive workpieces and workpieces with different clamping bases into consideration.

Characteristic of the known technical solutions It is already known for distortion sensitive workpieces, which must be clamped exactly for mechanical processing,

provide one or more secondary voltages in addition to the primary voltage.

So is with the DE-Pat. 3333813, B 23 Q, 3-06, a workpiece clamping device has become known in which the collet, the

is attached to a spreader, is operated by hand.

The disadvantage of this design is that the dike version is not suitable for an automatic clamping process and the Sensitivity of the tension during spreading of the expanding mandrel, which simultaneously forms the guide for the collet,

is impaired.

The DD-WP B 23 Q / 3082661 proposes a precision clamping device, the hydraulically operated clamping jaws

between which the workpiece is brought into abutment, then tensioned and then a frictional

Clamping of the clamping system takes place. A disadvantage of this fine clamping device, in addition to its size, dis considerably limits the application,

in particular, the only frictional clamping, the ice additional element is required.

Object of the invention

The aim of the invention is to be achieved that avoided with the restoring rigid clamping and support element deformation of the workpieces during the clamping process and after determining the position of a positive clamping of the workpiece is made possible.

Presentation of the essence of invention

The object of the invention is the structural design of a restoring rigid clamping and support element with a relatively small footprint by a compact design, with self-locking and low frictional forces between the components. According to the invention we achieved this, that in a housing two spring loaded Keilschieber are arranged, of which the first Keilschieber with an axially movable support sleeve and the second Keilschieber with an axially opposite to the support sleeve axially movable clamping bolt is in operative connection, and that the clamping bolt, in a bore received within the support sleeve, is provided with a pull rod, which is guided in longitudinal bores of the support sleeve and the driver. The wedge slides are each provided with a compression spring on their clamping side. Another compression spring is arranged on the drawbar.

To reduce the frictional forces can be advantageously arranged between the wedge surfaces rolling elements. Furthermore, it is provided that the collet is designed to be pivotable.

Ausführungsboisplel

The invention is explained in more detail below with reference to a preferred embodiment. The accompanying drawings show:

1 shows a longitudinal section through a restoring rigid clamping and supporting element in clamping position. 2 shows a section A-A through FIG. 1.

As can be seen in the drawing, are in a housing 1, in two adjacent holes 2.3, two Keilschieber 4.5, each having a mirror image opposite wedge surface 6.7. The wedge surface β stands with

a wedge surface 8 of a support sleeve 9 in operative connection, which is axially displaceably guided in a bore 10 in the housing 1 and with

Is provided sealing elements. In a bore 11, in the support sleeve 9, the collet 12 is guided axially displaceable with associated clamping hooks 13. The collet 12 is designed with a pull rod 14 in the central holes 15 and 1 β of the support sleeve 9 and Carrier 17 is guided and is provided at the end > with a contact washer 18. The collet 12 is through the axial

arranged compression spring 19 which is supported on the bore bottom 20 of the bore 11 via the contact plate 18 constantly to the

Mitnehmer 17 created. The driver 17, which is guided axially displaceably in the bore 10 of the housing 1, stands on the wedge surface 21 with the Wedge surface 7 of the wedge slide 5 in operative connection. In the driver 17 is a position fuse 22 for the collet 12th

intended.

The wedge slide 4.5 have on their clamping side in each case a compression spring 23,24, which is located on the piston surface of the Support wedge slide 4.5 as well as on the covers 25,26. Between the wedge surfaces 6,8 and 7,21 are to reduce the Friction forces preferably rolling elements 27,28 arranged. The wedges 4.5 are in the area of the wedge surfaces

slot-shaped recesses 29,30 provided in which Abflächungen 31,32 of the support sleeve 9 and the driver 17 are fitted and secure them against rotation.

The mode of action of the restoring rigid clamping and supporting element is the following: By depressurizing the cylinder chambers 33,34 via bore 35, move the springs 23,24 on the Keilschieber 4.5 the Support sleeve 9 and collet 12 axially against each other until the contact surface 36 and the clamping hook 13 to the workpiece 37th

come independently from each other to the plant.

By throttling the effluent hydraulic oil from the cylinder chambers 33,34 while a muted application to the Workpiece 37 reached. By controlling the cylinder chambers 33,34 can apply the contact surface 36 and the Clamping hook 13 can be effected on the workpiece 37 in any order. To release the workpiece clamping, the cylinder chambers 33, 34 are acted upon via bore 35 with pressurized oil. This causes,

in that the wedge slides 4, 5 are pressed against the compression springs 23, 24 and thereby release the wedge tension and over

Compression spring 19, the contact surface 35 and the clamping hook 13 are moved away from the workpiece 37. The clamping forces can, if necessary, by pressurizing the cylinder chambers 38,39, via bore 40 after the Plant surface 36 and the clamping hook 13 have come to the workpiece 37 to the system to be increased.

Claims (3)

1. Resetting rigid clamping and support element for distortion-free clamping urd / or supporting workpieces, characterized in that in a housing (1) two spring loaded wedge slide (4,5) are arranged, the wedge slide (4) with an axially movable support sleeve (9) and the wedge slide (5) with a counter to the support sleeve (9) axially movable collet (12) is in operative connection, and in that the collet (12), in a bore (11) received within the support sleeve (9) with a drawbar (14) is provided which in bores (15,16) of the support sleeve (9) and a driver (17) out, provided with a compression spring (19) and further the wedge slide (4,5) on their Tension side compression springs (23,? 4) have. 2. Reset rigid clamping and support element according to item 1, characterized in that between the wedge surfaces (6,7) and (8,21) rolling elements (27,28) are arranged. 3. Reset rigid clamping and support element according to item 1, characterized in that the collet (12) is designed to be pivotable.