DE102009016253A1 - Device for pressure medium cushion for clamping machine or tool units, particularly for metal cutting or metal forming processing of thin-walled long-material pipes, has two axially spaced, elastomeric, tape-like, closed withdrawal elements - Google Patents

Abstract

The device comprises two axially spaced, elastomeric, tape-like, closed withdrawal elements (8) that are connected to a ring (8a). The withdrawal elements are embedded in the clamping plates (4,5) with a depth of an annular groove. The depth of the annular groove, is twice the thickness of the withdrawal element. A material pipe has circular or polygonal cross section. An independent claim is also included for a method for metal cutting or metal forming processing of thin-walled long-material pipes with circular or polygonal cross section.

Description

The The invention relates to a device for clamping machine and / or Tool parts, in particular during cutting or non-cutting machining of thin-walled long material made of tubes with circular or Polygonal cross-section, one with a valve connection Pressure medium cushion between two opposing clamping plates and retraction elements for relaxing the pressure medium cushion and a method of handling the device.

From the DE 40 40 295 C2 is a druckmittelbetätigbare lifting and / or clamping device with at least one inflatable, stabilized, gas-tight, flexible, provided for performing the lifting movement, provided with at least one pressure medium connection container, which is arranged between two in the rest state parallel to each other, connected pressure plates, wherein between the flexible container and two opposite, longer printing plate edges each have a free edge area of the plate is present.

This known object has the further features that in each case the ends of the pressure plates connected to the provision the printing plates in the starting position after draining the pressure medium serving retreats in the form of rubber springs of the same Length attached and stroke limiting elements in the form of simple bolt with a conical head are arranged. It has been shown in practice that the rubber-metal compound such rubber buffer ruptures with increasing stroke of more than 5 mm and thus the entire device becomes unusable. Furthermore is a relatively complex processing of items required.

In contrast, The invention is based on the object, a larger To allow stroke of the retraction elements and their Increase stress capacity.

The Asked task is inventively characterized solved that at least two axially spaced, elastomeric, band-shaped, closed to a ring retraction elements are provided, each in the clamping plates with the depth of a annular groove, which is about twice the thickness of the retraction element corresponds, are embedded. This allows the stroke of the clamping plates increased to about ten times the previous rubber buffer and the permissible cyclic loading is considerable higher than before. Working strokes from 40 to 50 mm are possible now. The softer version of the retraction device and the length variability result in a multiple Stretch towards the rubber buffers and allow a gentler or more sensitive adaptation of the device to the fixed bearing. The retraction elements can also be stacked in multiple layers be positioned and strengthened thereby the retreat force. Accordingly, provide a larger Number of retraction elements per groove for one fast relaxation of the pressure medium cushion. Continue to arise also lower production costs, if instead of the heavy clamping plates made of metal such are selected from plastics. One Another advantage is the savings of a special stroke limitation because such is formed by the workpiece itself.

There the clamping plates are separated from each other, it is necessary for the Bandfömigen, elastomeric retraction elements each only partially annular grooves in a clamping plate, in which the retraction elements embedded and guided are.

Of the Connection for the pressure medium (preferably air) is to that effect designed that a 3/2-way valve on one end face of the pressure medium cushion is provided extending perpendicular to the spreading or clamping direction.

Spring Cavities may according to further advantageous features This avoids that between a block of two clamping plates, one Pressure medium cushion and retraction elements and a circular or polygonal thin-walled pipe in pairs cavities filling fittings are inserted.

A another design is that approximately parallel to the pressure medium cushion, or extending to the clamping plates or to the fittings several smaller diameter tubes are attached. These pipes are used for vibration damping bearings in motion Long goods located, for example. Rolled strip, and also reduce disturbing Noise due to the hollow effect of the single tube, without even to generate a significant vibration. In rolling mills Can this effect of vibration damping even a double function of stripping liquid, such as oil, are observed.

The stated object is achieved in a method for cutting or non-cutting of thin-walled long material from tube with circular or polygonal cross section according to the invention in that in the interior of the tube cross section a block consisting of two outer clamping plates is inserted with intermediate pressure medium cushion and then with the pressure medium cushion Pressure medium is applied, and its pressure is set to the desired spreading force for the circular or polygonal cross-section. This will cause different effects achieved in the mechanical processing of thin-walled tubes and other profiles by turning, drilling, milling, sawing u. Like. Emerge noise levels with high frequency, which form considerable physical stress for the mechanic or the operator and in extreme cases, for example, can lead to hearing damage. These disadvantages are avoided by the invention. After carrying out the procedural steps described above, the processing can be carried out without noise problems.

In the drawing embodiments of the invention are shown, the next will be explained in more detail.

It demonstrate:

1A an axial longitudinal section through the pressure medium cushion with double-sided clamping plates and retraction elements,

1B which to 1A belonging side cross section in the groove plane,

2A an axial cross-section like 1A , but with machine or tool parts,

2 B which to 2A belonging side cross section,

3A an axial longitudinal section through another application example,

3B which to 3A belonging side cross section,

4A in axial longitudinal section, the block in a tube with non-pressurized pressure medium cushion,

4B which to 4A belonging side cross section,

5A the same representation as 4A in the printing state of the printing medium cushion,

5B which to 5A belonging side cross section,

6A an axial longitudinal section through the block in a thin-walled tube for the application of the method in pressureless state of the pressure medium cushion,

6B the same longitudinal section as 6A in pressurized state,

6C a radial cross-section with the cavities between the block and a pipe-filling fittings,

7A a cross section through the block with a special measure and

7B which to 7A belonging longitudinal section.

According to 1A forms the device for clamping of machine and / or tool parts, in particular during cutting or non-cutting machining of thin-walled long material, such as, for example, a thin-walled tube 1 Cushioning a printing medium 6 with a 3/2-way valve connection 1c and a 3/2-way valve 1a a block 3 together with opposite clamping plates 4 and 5 having. To the clamping plates 4 and 5 are in the exemplary embodiment, three axially spaced, elastomeric, band-shaped, to form a ring 8a closed retraction elements 8th guided in the clamping plates 4 . 5 with the depth 9a an annular groove 9 , which is about twice the thickness 8b of the retraction element 9 correspond, are embedded and guided. So as long as a force in spreading or tensioning direction 10 is exercised, are the band-shaped retraction elements 8th safely in the bottom of the groove 9 and can not be exposed to wear or even damage. In 1B can be seen as the band-shaped retraction element 8th runs, in the corners and stronger curves for deflecting from the horizontal to the vertical (the drawing) can be provided.

At one end 6a of the pressure medium cushion 6 becomes the print medium 7 or discharged by opening the 3/2-way valve. The print medium 7 preferably consists of air, but can also be represented by a liquid.

In the 2A . 2 B is the formed block 3 between distance plates 4a . 5a in addition to the clamping plates 4 . 5 used, which may be part of a machine or tool parts.

In the 3A . 3B is the block 3 within a round body shell 12 used and keeps them at will by the pressure of the pressure medium 7 firmly.

The 4A and 4B show the block 3 depressurized in a thin-walled tube 1 with polygon cross section 2 , This condition is in the 5A and 5B by pressurizing the pressure medium cushion 6 transferred to a clamping position.

The 7A and 7B represent a particular embodiment with additional measures of vibration or noise control. On the spacer plate 4a are at least two tubes parallel to each other 13 attached to a smaller diameter, the damping on, for example, tangentially continuous rolled strip 14 Act.

According to the 6A . 6B . 6C is the block 3 internally 1b of the polygon cross section 2 in the unpressurized state ( 6A ) by the block 3 was inserted by hand. The block 3 consists of the pressure medium cushion 6 , on the rectangular clamping plates 4 (above) and 5 rest (below). The band-shaped retraction elements 8th are annular in the annular grooves 9 inserted and hold under the resilient tension the block 3 together. As 6C shows is the block 3 here rectangular or square executed and is by outside arcuate fittings 11 to the interior 1b of the polygon cross section 2 added. When pressurized ( 6B ) are the fittings 11 according to the pressure of the medium 7 pushed outward and support the interior 1b of the polygon profile 2 with the adjusted force. As a result, vibration of the pipe end and noise during processing is virtually avoided, as well as natural oscillations of the block 3 be largely prevented.

1

thin-walled pipe

1a

3/2-way valve

1b

Interior of the polygon profile

1c

3/2-way valve port

2

Circle- or polygon cross section

3

block

4

chipboard

4a

spacer plate

5

chipboard

5a

spacer plate

6

Pressure medium cushion

6a

front of the pressure medium cushion

7

print media

8th

band-shaped return element

8a

annular return element

8b

thickness

9

annular groove

9a

depth the groove

10

spreading or clamping direction

11

fitting

12

Around body shell

13

pipe smaller diameter

14

rolled strip

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4040295 C2 [0002]

Claims (6)

Device for clamping machine and / or tool parts, in particular during cutting or non-cutting machining of thin-walled long material from tubes with circular or polygonal cross-section ( 2 ), which has a pressure medium cushion provided with a valve connection ( 6 ) between two opposing clamping plates ( 4 . 5 ) and retraction elements ( 8th ) for relaxing the pressure medium cushion, characterized in that at least two axially spaced, elastomeric, band-shaped, to a ring ( 8a ) closed retraction elements ( 8th ) are provided, each in the clamping plates ( 4 ; 5 ) with the depth ( 9a ) an annular groove ( 9 ), which is about twice the thickness ( 8b ) of the withdrawal element ( 8th ) corresponds, are embedded. Apparatus according to claim 1, characterized in that the band-shaped elastomeric retraction elements ( 8th ) in each case in part-annular grooves ( 9 ) in a clamping plate ( 4 or 5 ) are admitted and guided. Device according to claims 1 and 2, characterized in that a 3/2-way valve ( 1a ) on a front side ( 6a ) of the pressure medium cushion ( 6 ) perpendicular to the spreading or tensioning direction ( 10 ) is provided extending. Apparatus according to claim 1, characterized in that between a block ( 3 ) made of two clamping plates ( 4 ; 5 ), a pressure medium cushion ( 6 ) and retraction elements ( 8th ) and a circular or polygonal thin-walled tube ( 1 ) pairs of cavities filling fittings ( 11 ) are inserted. Apparatus according to claim 4, characterized in that approximately parallel to the pressure medium cushion ( 6 ) or to the clamping plates ( 4 . 5 ) or to the fittings ( 11 ) running several tubes ( 13 ) are attached smaller diameter. Method for cutting or cutting thin-walled long material from a tube having a circular or polygonal cross section ( 2 ), characterized in that in the interior ( 1b ) of the pipe cross section a block ( 3 ), consisting of two external clamping plates ( 4 . 5 ) with intermediate pressure medium cushion ( 6 ) and then the pressure medium cushion ( 6 ) with pressure medium ( 7 ) is applied, and its pressure on the desired spreading force for the circular or polygonal cross-section ( 2 ) is set.