DD238742A1 - ARRANGEMENT AND METHOD FOR CUTTING LENGTH DETERMINATION ON WIRE MILLS - Google Patents

Abstract

Arrangement and method for cutting length determination on wire rolling mills, which are applicable to wire rolling mills. The aim of the invention is to optimize the Schopflaenge and reduce the waste mass and the working time. The task is to take into account the current rolling stock speed and laying tube speed when determining the cutting length on wire rolling mills. According to the invention, a speed measuring section is arranged between the exit from the finishing scale and the primary engine section. It determines the rolling stock speed, the position of the laying pipe and the sectors of the winding loop circle that are undesirable for the discharge, and corrects the cutting time.

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a system and a method for cutting length measurement, which are applicable to wire rolling mills.

Characteristic of the known technical solutions *

The practical experience of hot rolling technology shows that the quality of the first turns of a rolling stock and the occurrence of accidents depend to a decisive extent on the position of the laying tube of the layer at the exit of the rolling stock.

Zuc position detection of the Windungslegers inductive and optical sensors are known that work without contact. There are currently two options for influencing the position of the lay-up layer when the edge of the wire leaves the laying pipe. Here, the Windungslegerdrehzahl is controlled by a brief acceleration process followed by braking or vice versa, to compensate for the "error angle".

Furthermore, the control of the Windungslegers is possible in that the Windungsleger runs at a reduced speed and is accelerated at a certain time to the target speed. The error angle to be corrected determines the starting time of the acceleration process.

In both solutions has the disadvantage that the Windungsleger allow a necessary acceleration only when much more powerful drive motors are used or the moment of inertia of the Windungslegers is significantly reduced.

From DE-AS 2038747 a system for fanning wire turns is known. In this solution, it is proposed that a control device with adjustable control members is arranged on the system with reel device. As a result, the scissors should be additionally controllable in accordance with the emergence of a wire tip formed by cutting.

With this solution it remains unclear how the changes in the rolling speed can be taken into account in the setting of the timers, since permanently set timers can not take into account rolling conditions. In rolling mills, however, temperature and speed changes play a decisive role.

In addition, the solution in DE-AS 2038747 does not allow optimization of the length of the shoe.

Object of the invention

The aim of the invention is to optimize the rod length in the wire rod production and reduce the rejects and the working time.

Explanation of the essence of the invention

The invention has for its technical object to develop a solution for cutting length determination on wire rolling mills, which takes into account the current Walzgutgeschwindigkeit and laying tube speed.

According to the invention the object is achieved by an arrangement consisting of a finished relay, a primary cooling section, a pair of scissors, a driver, a winding layer with position sensor, a laying pipe, a conveyor with secondary cooling section and between HV finished block and primary cooling section from a Geschwindigkeitsmeßstrecke with multiple sensors are arranged on a defined length exists.

According to the current rolling stock, the position of the laying tube at the time of passage of the rolling load on the second sensor of Geschwindigkeitsmeßstrecke, the laying tube at exit of the wire and the position within one or more fixed, for the Äderaustritt undesirable sectors of the Windungslegerkreises determined and the shearing time accordingly corrected.

The inventive arrangement and the proposed method have the advantage that when changing the rolling conditions, such as rolling temperature and speed, the corresponding changes in the Walzgutgeschwindigkeit can be considered immediately. In addition, in the automatic shear timing correction and the laying pipe speed can be included. As a result, a minimum shoe length is also possible.

embodiment

In Figure 1, the arrangement according to the invention is shown schematically. After the finishing season 1 is before the primary cooling section a speed measuring device 3 with a gauge length of z. B. arranged a meter. In this case, the shearing time correction takes place by the rolling speed is determined without contact after the finishing stagger 1 of the rolling train by means of a Geschwindigkeitsmeßstrecke.

_v _ £ v Sv - length of the speed measuring section

W tw tv - time of passage of the tip through the measuring path

In addition, the position of the Windungslegers is determined at the time of passage of the wire tip on the 2nd sensor of Geschwindigkeitsmeßstrecke. 360 °

° o ο 't ¹ P - Period of one turn of the layer, determinable between

P 2 position pulses of Windungslegerlagegeber

t ₀ - Time between the last pulse of the winding position sensor and the pulse of the 2nd encoder of the speed measuring section

Thereafter, the calculation of the movement time of the rolling needle tip drawn by the predetermined length of the shoe from the second sensor of the speed measuring section to the exit from the laying head takes place.

S ₁ H-Sun +! S ₁ - Distance from the 2nd sensor of the V-measuring section to the scissors

tss ⁼ S ₂ - path from the scissors to the exit of the layer

W l _s - predetermined length of the head

In addition, the calculation of the resulting without correction bearing ear angle at the wire exit is made.

360 ^ a ^ = t ^ + a_ - χ · 360 ° a _A - uncorrected exit angles

¹ p

χ - number of complete rotations of the turn table = (t _A + t _s ) ³ I ^ - -c c-360 °

XEN N - set of the whole positive numbers (subtraction of the full

revolutions)

The correction factor of the exit angle and thus the shear time points is checked:

βφί - Unterebzw. upper limit of the i-th forbidden for the vein exit, $ <Λα <γι circular arc

S ₁ + I.

- if a _A outside the intervals - no correction necessary - »t _s = -y- shear time, s. section 8

- if a _A within one of the intervals - Correction necessary - Delay of the cutting time The calculation of the angle of correction of the bearing hot seat is also made.

y-, - α _Α = Λα where i - No. of the interval in which a is _A.

Thereafter, the calculation of the correction of the shear time Δα- t _n

At ₅ = B

^s 360

and the calculation of the corrected shear time takes place.

S ₁ + LS ₁ + l _s Δα-tr,

W = ^ t ₅ = - + At ₅ = - + - ^

t _s - Time from the impulse of the 2nd sensor of the V-measuring path until the release of the scissors, without correction

Wr. - corrected period of release of the scissors. Figure 2 shows the algorithm of the cutting length determination schematically.

Claims (2)

Claim: 1. Arrangement for cutting length determination at wire rolling mills, consisting of a finished relay, a primary cooling section, a pair of scissors, a driver, a winding layer with position sensor, a laying tube and a conveyor; characterized in that between the outlet of the finishing scale (1) and the primary cooling section (4) sensors of a speed measuring device (3) are mounted. 2. A method for the arrangement according to claim 1, characterized in that the current Walzgutgeschwindigkeit is determined at the exit from the Fertigstaffel on a defined measuring section and the position of laying tube at the time of passage of the rolling load on the second sensor of the speed measuring, the position of laying tube Outlet of the rolling stock not corrected in its cutting length, which are determined for the emergence of unwanted sectors of the Windungslegerkreises and the correction of the shear time.