DE4119843A1 - Universalrotating shears - with rdeuced wastage of rolled material - Google Patents

Abstract

The universal rotating shears for severing rolled material, especially fine steel strip and wire, has a guide tube capable of being swivelled horizontally, two continuously rotating blade heads (top and bottom) and a mechanism behind the blade heads for diverting the rolled material. It is characterised by the fact that the blade heads jointly have at least three blade pairs (8 and 21, 9 and 13, 10 and 14) located in different rotation planes (a,b,c,d) and arranged on the top and bottom blade heads so that there is a gap, in the axial direction, at least between two adjacent blade pairs. USE/ADVANTAGE - The shears can be used in fine strip and wire rolling installations. In comparison with known stop-start shears, the power requirements of the proposed shears are greatly reduced. In comparison with known rotating shears, their use results in reduced waste material.

Description

The invention relates to a universal rotating scissors for cutting up rolling stock, especially for fine steel and Wire, one horizontally swiveling guide tube, two constantly rotating cutter heads and one Has rolling stock discharge device.

Rotating shears are used in fine steel and wire rolling mills for scooping the tips and ends as well as that Divide the rolling veins, for chopping into Scrap lengths and for sampling from the core needed. Several designs are known for this.

The most commonly used are the so-called start-stop Scissors that move from a standstill to every cut. (Becker, H. et al .: Walzwerke, VEB Deutscher Verlag f. Basic materials industry, Leipzig 1980).

For the given rolling stock speeds are for the Mass acceleration in the scissors is considerable Drive power required. There were scissors before Wire rod block known for scooping tip and end as well as for the emergency cut on each cutter head three knives touching each other without gaps exhibit. For rolling stock speeds over 15 m / s these scissors are not suitable.

There are also rotating scissors with constantly rotating ones Knife heads according to DD PS 2 03 257 and DD PS 2 21 943 known, which is only used for scooping the tip and end can be. Because of the long used Scrap discharge devices were scraps of approximately 2.50 m required that the spreading of the rolling mill in unacceptably reduced.

The invention according to the preamble of the first claim the underlying problem is the required one Reduce drive power for rotating shears and to minimize the rolling loss during cropping.  

According to the invention, this is characterized by Part of the 1st claim specified arrangement of Knife pairs loosened on the knife heads. Specific Refinements are specified in the subclaims.

In the following, the invention is to be illustrated using exemplary embodiments are explained. It shows

Fig. 1 cutter heads with rolling stock discharge device

Fig. 2 section according to AA

Fig. 3 cutter heads with guide tube

Fig. 4 cutter head variant

Fig. 5 cutter head variant

Fig. 6 cutter head variant

Fig. 7 cutter heads plane a of Fig. 3

Fig. 8 cutter heads level c of Fig. 3

Fig. 9 cutter heads level d of Fig. 3

A guide tube 3 with a guide tube drive 4 is assigned to the rotating shear ( Fig. 1-3). Upper cutter head 1 and lower cutter head 2 each have four rotation levels a, b, c and d. The plane of rotation a has an upper knife 8 at the front and a lower knife 12 at the rear ( FIG. 7), rotation plane c has an upper knife 9 at the rear and a lower knife 13 at the front ( FIG. 8) and the plane of rotation d has at least two Upper knives 14, 15 arranged evenly on the circumference of the knife heads 1, 2 ( FIG. 9). No knives are arranged in the plane of rotation b. Depending on the material diameter to be cut, the tongue 5 arranged downstream of the scissors is arranged elevated by an amount F above the center of the rolling stock ( FIG. 1). With an actuator 17 , the tongue 5 can be pivoted horizontally in the rolling stock plane up to the rotation plane a. The vertical switch 6 is arranged downstream of the cutter heads 1, 2 and the tongue 5 at the center of the rolling stock and can be pivoted vertically via a rocker arm 20 with an actuator 7 .

The invention works as follows:

The scissor drive motor works continuously. To scoop the rod tip 16 , the guide tube 3 is positioned by means of a guide drive 4 in the plane of rotation 9 at the height of the rolling stock, the starting speed of the knife being regulated such that a cropping piece of the required length is sheared off. Occurs at the time of the vertical knife-zero position (FIG. 1) through the guide tube 4 drive the transverse movement of the guide tube 3 in the horizontal plane of rotation in Walzgutlaufhöhe to b while a cutter head rotation. The rod passes through in this plane of rotation, with the transverse movement of the guide tube 3 horizontally in the rolling stock height up to the plane of rotation c in connection with a speed control of the scissor motor in order to scoop the rod end in such a way that a cropping end of the required length is sheared off and the Transverse movement of the guide tube 3 without intermediate stop, continues continuously into the plane of rotation d. The pause between two bars is used to switch the guide tube 3 back into the plane of rotation a. If there is a need for an emergency cut during the position of the guide tube 3 in the rotational plane a or b, the transverse movement of the guide tube 3 is to be carried out in such a way that the separating cut is made when passing through the rotational plane c and the subsequent material is chopped in the rotational plane d.

The derivation or guidance of the material after cutting is carried out as follows: To scoop the rod tip, the tongue 5 is pivoted into the plane of rotation a by the actuator 17 . Due to the above increased the Walzgutlaufhöhe arranged tongue 5, the rod tip from the straight running direction in the direction of scrap is deflected 18th The cropping cut now takes place at the front, with the cropping piece rod tip 16 being moved in the direction of scrap removal 18 in this plane of rotation a and the subsequent rod tip being lifted over the tongue 5 . After the cut has been made, the tongue 5 is pivoted out of the area of the cutter heads 1, 2 by means of an actuator 17 . The rod tip of the Gutader runs into the rolling stock guide 19 . Before the crop cut at the end of the bar, the vertical switch 6 is moved by the actuator 7 from position I to position II.

There is the cropping cut at the bar end, the knife arrangement in the plane of rotation c moving the outgoing bar end in the direction of the upper cutter head 1 and the tip of the cropping piece in the direction of scrap removal 18 , so that the cropped bar end is reliably derived. The material not cut in the plane of rotation d is also conveyed in the direction of scrap removal 18 by the arrangement of at least two pairs of knives, each with trailing upper knives 10, 11 and leading lower knives 14, 15 .

Depending on the task of the scissors, e.g. B. for scooping, dividing into cooling bed lengths, emergency cut or for sampling, the knife pairs according to Fig. 3-6 are arranged differently in the rotation planes ae. Also, according to Fig. 7-9, the number of blades per plane of rotation and the cutter head for the task at different accordingly have the cutter heads forwards or backwards lying upper knife and lower knife on.

. The rotary shears according to Figure 4 takes on the functions of:

Scooping the tip and end of the roll, as well as emergency cutting and chopping. In one embodiment, the guide tube 3 guides the rolling stock into the plane of rotation a of the upper and lower cutter heads 1 u. 2nd A rolling stock indicator several meters in front of the rotating shear gives an impulse to the control when the rod tip passes, so that the shear drive, by means of intermediate acceleration and deceleration, enables the knives to ensure that a preselected length is cut off as the tip of the rod tip. This rolling stock indicator simultaneously triggers the pivoting of the guide tube 3 from the plane of rotation a to c. At the moment when the rolling stock passes through the plane of rotation b, the upper knife 8 and lower knife 12 ( FIG. 7) cut off the preselected cropping piece. In the plane of rotation c, the rolling stock passes through the guide tube 3 , the vertical switch 6 and the rolling stock guide 19 in a straight direction. When the end of the rolling stock passes the pulse generator, as described above, the scissors drive is regulated and the pivoting of the guide tube 3 from the rotation plane c to the rotation plane e is triggered. This pivoting can also be done by triggering an emergency cut. In the plane of rotation d, the upper knife 9 and lower knife 13 ( FIG. 8) separate the cropping piece from the bar end or, in the case of an emergency cut, the subdivision of the rolling wire, which is pivoted further into the rotation plane e and chopped into scrap pieces ( FIG. 9) .

A further application of the rotating scissors is shown in FIG. 5. These scissors are used for cropping the tip and end of the rod and for dividing the roller core, e.g. B. in cooling bed lengths used. The rod tip is scooped in rotation plane a and the rolling stock is swiveled in rotation plane b. To subdivide the rolling stock into several cooling bed lengths, the guide tube 3 is alternately pivoted back and forth between the rotation planes b and d, the cutting process always lies in the rotation plane c. Depending on the position of the last cooling bed length, the rolling stock is guided into the rotation plane a or e for cropping and chopping the rod end.

Referring to FIG. 6, the rotary shear is used for the sampling of the core center and for cropping the rod end. The rolling core runs in a straight direction in the rotation plane a through the scissors system. If the impulse for sampling is given, the guide tube 3 swivels from the plane of rotation a in a straight direction through the scissor system. If the impulse for sampling is given, the guide tube 3 swivels from the plane of rotation a to the plane of rotation d. The swiveling speed of the guide tube 3 is regulated so that the rotation planes b, c and d are reached exactly after one revolution of the cutter heads. A sample in the length of the knife circle diameter is cut out. To scoop or chop the rod end, the guide tube 3 moves into the plane of rotation e. The position of the knives per pair of knives is for rotation plane b according to FIG. 7, for rotation plane c according to FIG. 8 and for rotation plane e according to FIG. 9.

Claims (3)

1.Universal rotating scissors for the cutting of rolling stock, especially for fine steel and wire, with a horizontally swiveling guide tube and two constantly rotating cutter heads, an upper and a lower cutter head and a rolling stock discharge device arranged behind the cutter heads, characterized in that the cutter heads ( 1 , 2 ) have at least three knife pairs ( 8 and 12, 9 and 13, 10 and 14 ) arranged on their circumference in different rotation planes (a, b, c, d, e) and that the knife pairs ( 8 and 12 , 9 and 13, 10 and 14 ) are arranged on the upper ( 1 ) and lower cutter heads ( 2 ) such that at least between two adjacent pairs of cutters ( 8 and 12, 9 and 13, 10 and 14 ) in A gap is arranged in the axial direction. 2. Universal rotating scissors according to claim 1, characterized in that in at least one plane of rotation (e) more than one pair of knives ( 10 and 14, 11 and 15 ) is arranged on the circumference of the cutter heads ( 1 and 2 ). 3. Universal rotating scissors according to claims 1 and 2, characterized in that the arrangement of the knives per pair of knives ( 8 and 12, 9 and 13, 10 and 14, 11 and 15 ) in the order of the successive rotation planes (a, b, c, d, e) changes, that is, that after a pair of knives with a rear upper knife ( 8 ) and front lower knife ( 12 ), a pair of knives with a front upper knife ( 9 ) and rear lower knife ( 13 ) follows .