DE102011119098A1 - Vibration damper for gripping interior of tube, has setting unit that is inserted in the end region of pipe and is coupled with damper - Google Patents

Abstract

The vibration damper has an expansion element (6) that is provided between a conical surface (13) on a base (2) and a sliding plug (5). The expansion element is pressed against the inner wall of a tube (1) by relative movement of the conical surface and the sliding plug. A setting unit (4) is inserted in the end region of the pipe and is coupled to the vibration damper.

Description

The invention relates to a vibration damper for use in the turning of workpieces with cavities. For example, occur during threading at the end of large pipes vibrations, which cause unwanted vibration marks or chatter marks. In addition, the vibrations have a negative effect on tool wear and machining quality. It is known to close the pipe ends with elastic plugs, which can cause a certain damping within narrow limits. Frequently, however, the achieved damping effect is not sufficient, which is why, depending on the wall thickness of the workpieces, the cutting parameters must be adjusted in order to achieve the desired manufacturing quality. This procedure usually extends the cycle time and shortens the tool life, since optimal cutting parameters can no longer be used.

It is the object of the present invention to provide a vibration damper for the machining of workpieces with cavities.

This object is achieved with a device according to claim 1. Advantageous embodiments are the subject of the dependent claims.

According to an advantageous aspect of the invention, the vibration damper is provided with a spanned by a threaded spreader, which is pressed over two clamping cone against the pipe inner wall. Due to the shape of the expansion element and clamping cone, pressing zones form between the expansion element and the inner wall of the pipe. This prevents tilting of the vibration damper in the pipe. The flat contact of the expansion element on the tube inner wall ensures the damping. About the variation of the tightening torque of the threaded spindle, a desired preload can be adjusted. With suitable change parts, expansion element and clamping cone can be adapted to the inner diameter of different workpieces.

In this way, the vibrations are reliably attenuated regardless of the wall thickness of the workpiece, so that you can work with optimal cutting parameters. Since the front side of the workpiece must be freely accessible during processing, the vibration damper is placed in automated machines by a dockable setting in the end of the tube and stretched and released after processing and removed from the tube. Placing, removing, clamping and relaxing can also be done manually. The introduction of the torque for tightening or loosening and the axial securing position of the vibration damper by means of a non-positive or positive connection.

A scraper arranged on the front side of the vibration damper reliably removes chips or coolant residues from the workpiece.

The invention will be explained in more detail below with reference to an exemplary embodiment.

Show it:

1 the vibration damper in the untensioned state

2 the vibration damper in the tensioned state

1 shows the unstressed vibration damper in the end of a pipe 1 , The main body 2 comprises a cylindrical surface and a conical portion with a conical surface 13 , On the left side of the main body 2 is the setting unit 4 arranged. This includes a setting bar 11 and a rotation lock 12 , About the setting bar 11 is the setting unit 4 can be coupled to the vibration damper. In the drilling of the body 2 is the hollow shaft 3 with the threaded spindle 17 arranged. At this is a self-locking saw thread 14 for the mother 7 intended. The hollow shaft 3 gets over the setting bar 11 set in rotation. The mother shifts 7 the sliding cone 5 to the conical surface 13 towards the spreader 6 to spread. The anti-twist device 12 prevents twisting of the body 2 when the hollow shaft 3 rotates. The vibration damper comes with the setting unit 4 in the pipe 1 used or removed from this again. In the hole in the hollow shaft 3 there is a shutter 9 from the spring 10 pressed into the closed position ( 2 ). According to 1 became the shutter 9 moved to the right against the spring force.

In 2 the vibration damper is shown in the tensioned state. The sliding cone 5 was from the mother 7 to the conical surface 13 postponed. This was the spreader 6 against the inner walls of the pipe 1 pressed so that its vibrations are safely prevented. The first and second key 8th . 15 prevent the mother 7 yourself with the threaded spindle 17 rotates. By selecting a suitable torque, the desired preload can be adjusted. The setting unit 4 was uncoupled, leaving the pipe 1 is freely accessible from the front side. The shutter 10 is in the closed position. The arranged on the front side of the vibration damper scraper 16 removes chips or coolant residues safely from the pipe 1 ,

LIST OF REFERENCE NUMBERS

1

pipe

2

body

3

hollow shaft

4

setting unit

5

sliding cone

6

spreader

7

mother

8th

first feather key

9

closing slide

10

feather

11

setting rod

12

twist

13

conical surface

14

buttress thread

15

second feather key

16

scraper

17

screw

Claims (5)

Vibration damper for clamping inside a pipe ( 1 ) with a basic body ( 2 ), with a hollow shaft ( 3 ), with a spreading element ( 6 ), with a sliding cone ( 5 ) and with a setting unit ( 4 ), wherein the spreading element ( 6 ) between a conical surface ( 13 ) on the base body ( 2 ) and the sliding cone ( 5 ) is arranged, wherein the spreading element ( 6 ) by relative movement of the conical surface ( 13 ) and the sliding cone ( 5 ) against the inner wall of the tube ( 1 ) is pressed, wherein the vibration damper with the setting unit ( 4 ) in the end region of a pipe ( 1 ), characterized in that the setting device ( 4 ) can be coupled to the vibration damper. Vibration damper according to claim 1, characterized in that for coupling the setting device ( 4 ) to the vibration damper a setting rod ( 11 ) is provided. Vibration damper according to claim 1 or 2, with a basic body ( 2 ) arranged hollow shaft ( 3 ), characterized in that the mandrel ( 11 ) to the hollow shaft ( 3 ) can be coupled. Vibration damper according to claim 3, characterized in that the hollow shaft ( 3 ) from the setting bar ( 11 ) is rotationally driven. Vibration damper according to one of the claims 1 to 4, characterized in that for removing the chips and / or coolant residues from the interior of the tube ( 1 ) at least one scraper ( 16 ) is provided.

Images