DE10113662A1 - Flexible distributing guide arranged upstream of a ring shearing machine having revolving ring knives used in the cropping of rapidly moving rolled material is a one-piece guide tube - Google Patents

Abstract

Flexible distributing guide (4) arranged upstream of a ring shearing machine having revolving ring knives (2, 3) is positioned so that it tilts in a fixing clamping device (5). Rolled material fed via an outlet opening (14) of the distributing guide toward the ring knives is guided either through the cutting-free region of the ring knives or through the cutting region by changing the relative position between the rolled material and the ring knives. The distributing guide is a one-piece guide tube. Preferred Features: The guide tube has a constant internal diameter. The outer diameter (DE, DA) of the guide tube constantly decreases from the fixed clamping device to the outlet opening.

Description

The invention relates to a rotating ring knife Pointing ring shears for cropping high-speed rolling well upstream flexible switch, which in one fixed clamping by means of a deflection device the switch is arranged pivotably, the above an exit opening of the switch towards the ring knives rolling stock by changing the relative position between rolling stock and ring knife either by the for the cut-free roll free passage between the ring knives or in the Cutting range of the ring knife is feasible.

When cropping high-speed wire before entering the finishing train of the rolling mill or when separating the non-tolerance front and rear end pieces of the wire After finishing rolling, the difficulty is in quick and safe distraction of the crested end from the zu directional.

For cropping, the wire is pulled out using a switch formed guide element through the cutting area of a Ring scissors pivoted. Such ring scissors consists of in a known manner from two around their axes with the same Speed rotating, axially cutting ring knives, their opposing cutting edges during the cutting process except for the one required to separate the rolling stock Distance are merged, as well as at an acute angle mutually arranged levels that are in a line to cut. The cutting area of ring shears is one Area in which the ring knife of the ring shears on the white test are approximate.  

From DE-OS 24 35 486 A1 a pair of ring scissors emerges a switch for guiding the rolling stock is connected upstream. The flexible switch consists of a flat spring steel Plate on which short pipe sections lying one behind the other are attached. At the free end of the switch is the piston rod of a cylinder which can be acted upon on both sides, so that the switch back and forth between two end positions is movable, with the switch in the first end position Rolled material in the space between the Ring knives and in the second end position in the cutting the ring scissors are feasible. To do that with such a Soft unwanted rebounding of the switch, especially at high rolling stock speeds, to be avoided in the DE-OS 24 35 486 proposed pneumatic measures that the Stabilize pressure in the lower chamber space of the cylinder and so that the flutter movement should curb.

However, it has been found that these pneumatic measures at today's high rolling speeds (V _w = 80 - 120 m / s) are not sufficient to effectively prevent the switch from springing back, so that the rolling stock sometimes unintentionally from the ring knives - or is cut off.

In addition to the increasing frequency of malfunctions in rolling stock speeds of over 40 m / s, the known switches suffer from one increased wear due to the guiding of the rolling stock the scale tubes arranged on the leaf spring result. The rolling stock is not evenly loaded in the scale tubes burdens, but bent according to the polygon that itself trained in the deflection of the switch. As a result of the increased Wear can cause individual scales to break out pipes come.

Based on this prior art, the invention is therefore based on the object to provide a switch for ring shears for cropping, the speeds even at high rolling speeds (V _w = 80 - 120 m / s) enables largely trouble-free operation of the ring shears and one less wear and tear.

This task is carried out with a switch of the aforementioned Art solved according to the invention in that the switch as a part, flexible guide tube is formed, the a change in the relative position between the rolling stock and the ring knife allows. The inner diameter of the guide is expedient pipe constant to the resistance within the guide to even out.

To ensure even deflection and thus harmo To achieve a niche curve of the switch, it is in one advantageous embodiment of the invention provided that the outer diameter of the guide tube from the fixed one voltage steadily decreases up to the outlet opening. The curves run with a largely constant radius to one fixed point leads to an even installation of the rolling gu tes on the inner guide of the guide tube and thus to reduce graceful wear.

A further reduction in wear within the guide can be achieved if the guide tube around its longitudinal axis is rotatable.

The drawing shows an exemplary embodiment. It shows

Fig. 1 a pair of ring shears with a switch and drive means for the rear cropping of a wire rod.

1 designates a housing 1 of a ring shear arranged in the running direction L of the rolling stock. The ring scissors have rotating ring knives 2 , 3 , whose mutually facing cutting edges, not shown in the drawing, are located at acute angles to one another and in the upper region are rich except for the distance required to separate the rolling stock.

The ring shear is preceded by a flexible switch 4 , which is arranged so that it can pivot in a fixed clamping 5 . At its free end, the switch 4 is surrounded by a force transmission member 7 , which is articulated ( 8 ) with a piston rod 6 , the pistons of which can be pressurized on both sides in a cylinder 9 is displaceably guided in a cylinder 9 . The cylinder chambers are connected to a compressed air source via a valve arrangement via compressed air pipes not shown.

In the region of the annular shear a guide 11 is arranged for deriving the rolling stock in pipe guides 12, 13 is derived, wherein the tube guide 12, the end of tuft collection point for the scrap, not shown, and the tube guide 13 leads the rolling stock. The figure shows the position of the switch 4 before separating the top end. In the end position shown, the outlet opening 14 of the switch 4 leads the approaching wire tip into the space between the ring knives 2 , 3 which is free for the passage of the rolling stock. By actuating the cylinder 9 , the switch 4 is pivoted into the upper end position indicated by the line 15 . When the switch 4 is swiveled up, the wire reaches the cutting area of the shears, which, depending on the rolling diameter and opening angle between the cutting edges, varies in size and extends from the point of the first notch to the point where the rolling stock is completely sheared off. The separated top end is passed through the guide 11 and the pipe guide 12 into the Schrottkü bel, not shown, while the wire is guided via the pipe guide 13 to a roll stand or reel, not shown.

The formation of the roller 4 as a one-piece guide tube, the outer diameter D _E , D _A of which steadily decreases from the fixed clamping 5 to the outlet opening 14 , for example from 35 mm to 25 mm, effectively prevents the flutter of the switch 4 during and after the back and forth Switch between the described end positions. Furthermore, the uniform curve indicated by the line 15 , which arises in particular as a result of the steadily decreasing outside diameter, effectively prevents the wear caused by the friction of the rolling stock on the inner walls of the guide tube. In which the guide tube is arranged to be rotatable about its longitudinal axis, a further equalization and thus a reduction in wear can be achieved. The rotation can take place, for example, by a servomotor, not shown, acting on the outer casing of the guide tube at time-specific intervals.

It goes without saying that the Wei according to the invention is used do not use ring scissors for tapping back shoops limited, but can of course also in Scissor arrangements with two ring scissors, so-called double Insert ring shears, the first ring in the direction of travel scissors to cut off the end of the crest and in the barrel direction further ring scissors to separate the front end the is provided.  

description

1

casing

2

ring diameter

3

ring diameter

4

switch

5

clamping

6

piston rod

7

Power transmission member

8th

joint

9

cylinder

10

-

11

guide

12

pipe guide

13

pipe guide

14

outlet opening

15

end position

Claims (5)

1. A circumferential ring knife ring scissors for scooping high-speed rolling upstream bie geo-elastic switch, which is arranged in a fixed clamping by means of a device for deflecting the switch pivotally, with the rolling stock tapering from an opening of the switch to the ring knife by changing the relative position can be guided between the rolling stock and the ring knife either through the free space between the ring knives for the cut-free passage of the rolling stock or in the cutting area of the ring knife, characterized in that the switch ( 4 ) is formed as a one-piece guide tube. 2. Bending-elastic switch according to claim 1, characterized, that the inside diameter of the guide tube is constant is. 3. Bending-elastic switch according to claim 1 or 2, characterized in that the outer diameter D _E , D _{A of} the guide tube from the fixed clamping ( 5 ) to the outlet opening ( 14 ) decreases continuously. 4. Bending-elastic switch according to one of claims 1 to 3, characterized in that the device for deflecting comprises a piston rod ( 6 ) acting on the switch ( 4 ), the piston on both sides of which can be acted upon by pressure medium in a cylinder ( 9 ) displaceably guided is. 5. Bending-elastic switch according to one of claims 1 to 4 characterized, that the guide tube is rotatable about its longitudinal axis is arranged.