JPH0241367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically operating a tension leveler.

In a tension leveler consisting of a 2nd or 3rd group tension prydle, skin pass mill, and leveling mill, the plate thickness, plate width, yield strength,
The operating conditions of the skin pass mill and leveling mill, such as elongation rate (rolling reduction rate), tension, rolling force, and intermeshed amount (the amount of intrusion between each roll of the leveling mill), etc., are manually set and operated according to the steepness, type, and history. However, for this reason, a tension leveler always required an operator.

From the viewpoint of labor saving, the present invention inputs the properties of the threaded material into a small-capacity electronic computer without human judgment, stores it, performs the necessary calculations, and automatically adjusts the operating conditions of the equipment based on the results. The aim is to automate the tension leveler and make it unmanned by setting it to .

The structure of the present invention to achieve the above object is an automatic operation method of a tension leveler in which an entry bridle, a skin pass mill, an intermediate bridle, a leveling mill, and an exit bridle are arranged in order, and the method includes data on processing material. The plate thickness, plate width, yield strength, and flatness are set in the calculator as follows, and the speed difference between the input side bridle and the intermediate bridle and the speed difference between the intermediate bridle and the output side bridle are calculated according to the given elongation rate. While controlling the speeds of the input side bridle and the output side bridle so that the speed difference is constant, the rolling force of the skin pass mill is determined based on the above data and the rolling force of the skin pass mill is controlled. The method is characterized in that the amount of reduction of the leveling mill is determined based on the amount of reduction of the leveling mill, and the amount of reduction of the leveling mill is controlled.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the equipment layout of a typical three-group bridle tension leveler. In this leveler, an inlet bridle 2, a tension meter 3, a skin pass mill 4, an intermediate bridle 5, a leveling mill 6, a tension meter 7, and an outlet bridle 8 are arranged from the inlet side to the outlet side of the strip 1. .

Bridle roll 5a of the intermediate bridle 5
is directly driven by the main motor 9. 10 is a pulse generator provided in the bridle roll 5a. The bridle roll 2a in the entry side bridle 2 is connected to the revolution shaft of the entry side differential gear (planetary gear device) 11, and the main motor 9 is connected to the ring gear in the entry side differential gear 11. An entry side stretching DC motor 12 is connected to the sun gear, and a speed difference is given to the bridle roll 2a with respect to other bridle rolls by changing the output of this entry side stretching DC motor 12. Reference numeral 13 is a tacho generator provided on the entry side stretching DC motor 12, and reference numeral 14 is a pulse generator provided on the bridle roll 2a. Similarly, in the exit bridle 8, the bridle roll 8a is connected to the revolving shaft of the exit differential gear (planetary gear) 15, and the ring gear in the exit differential gear 15 is connected to the main motor 9. An output stretching DC motor 16 is connected to the sun gear, and changes in the output of the output stretching DC motor 16 give the bridle roll 8a a speed difference with respect to other bridle rolls. Reference numeral 17 is a tacho generator provided on the exit side stretching motor 15, and reference numeral 18 is a pulse generator provided on the bridle roll 8a. In addition, 19 is the entry side,
These are slip clutches for each of the intermediate and exit bridles 2, 5, and 8. Said skin pass mill 4
consists of a work roll 4a and a back-up roll 4b, and is driven by a skin pass mill DC motor 20. In skin pass mill 4, 21
is a hydraulic pressure reduction cylinder, 22 is a roll position detector,
23 is a servo valve, and 24 is a load cell.
The leveling mill 6 consists of six roll units, each unit consisting of a work roll 6a, a deflector roll 6b, etc. 25 is an AC motor, and 26 is a pulse generator.

In such a three-group bridle type tension leveler, tension is applied to the strip 1 by operating the inlet bridle 2 at a low speed and the outlet bridle 8 at a high speed with the intermediate bridle 5 as a reference.

In this three-group bridle type tension leveler, the skin pass mill 4 can be operated alone, the leveling mill 6 can be operated alone, and these can be operated in combination. The objects (matters) to be controlled in each section are described below.

(1) Skin pass mill section a. Elongation rate control This elongation rate control is to control the speed of the entry side stretching DC motor 12 so that the speed difference between the entry side bridle 2 and the intermediate bridle 5 is a constant value. , is carried out when the hydraulic pressure reduction control mode is BISRA or constant pressure.

b Hydraulic pressure reduction control, localization control, BISRA control,
In addition to the three main controls of constant pressure control, it includes controls such as rapid lowering, oil column reset, gear preset, equilibrium pressure reduction control, and hydraulic pressure reduction gain correction.

(2) Leveling mill section a Elongation rate control This elongation rate control means that the exit side stretching motor 15 is controlled so that the speed difference between the intermediate bridle 5 and the exit side bridle 8 is constant.
This is done when the leveling mill 6 is closed.

b Leveling Mill Reduction This includes rapid opening to lower and raise the entire mill, and intermeshed adjustment to adjust the amount of individual roll reduction. The interface adjustment is performed by an AC motor 25.

(3) Others Torque control of the slip clutch 19 is performed in proportion to the strip tension detected by the tension meters 3 and 7. Furthermore, in the case of a continuous line, welding point tracking is automatically controlled.

The control described above, except for welding point tracking,
Conventionally, this was done through manual settings and adjustments by operators, but in the present invention, the entire line is controlled by a host computer (CPU), and all of the above control settings and adjustments are performed by a process sequencer (PS). be. In other words, the data regarding the strip is calculated by a large-capacity host computer, the data is read in advance into a small-capacity process sequencer, and the calculations of various set values for strip 1 are automatically performed by the sequencer next time.

The following strip data is given to the process sequencer by the host computer for various set value calculations.

σ _yp : proof stress, F: flatness (steepness), t: plate thickness,
B: Plate width Next, the setting value calculation for each section will be explained.

(1) Skin pass mill a Elongation rate ε _S Yield strength σ _yp Values corresponding to yp or flatness F are set in advance in the process sequencer.

b Rolling force P Proof force σ _yp is used as a parameter, and the relationship between plate thickness t and rolling force P _u per unit plate width is set in the process sequencer as a line graph as shown in Figure 2. The rolling force P _u is determined from the thickness t and the yield strength σ _yp , and this is multiplied by the plate width B to determine the rolling force P.

c Tension T T _u about the tension T _u per unit width
= k ₁ t + k ₂ and the obtained tension T _u
Find the tension T by multiplying by the plate width B. Constant k ₁ ,
k ₂ is determined by the yield strength σ _yp . This tension calculation value is used to determine the deviation from the tension signal from the tension meter during constant pressure control, feed it back to the reduction force control circuit, and keep the strip tension at a constant value.

(2) Leveling mill a Elongation rate ε _L Calculated as a function of the given plate thickness t and yield strength σ _yp or flatness F. An example is shown in FIG.

b Reduction amount L The relationship between the plate thickness t and the reduction amount L using the yield strength σ _yp (or flatness) as a parameter is calculated for each unit by the intermeshing adjustment amount (reduction amount) of the six units in the leveling mill 6. As shown in the figure, it is set in the process sequencer as a line graph, and the reduction amount L is calculated based on the given plate thickness t and yield strength σ _yp .
seek.

As described above, data regarding the strip is given to the process sequencer in advance, and set values for each section are determined in accordance with the operating conditions to control the equipment.

As described above, according to the automatic operation method of a tension leveler according to the present invention, the yield strength, steepness, plate thickness, plate width, etc. of the processed material can be controlled by using a process sequencer under the condition of constant elongation control. The rolling force of the skin pass mill and the amount of roll intermeshing of the leveling mill are calculated and automatically set based on the data, and the entire tension leveler is operated automatically, so unmanned operation of the tension leveler can be achieved. .

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a three-group bridle type tension leveler, Fig. 2 is a graph showing the rolling force versus strip thickness, Fig. 3 is a graph showing the elongation rate versus strip thickness using yield strength as a parameter; FIG. 4 is a graph showing the amount of intermeshing with respect to plate thickness using yield strength as a parameter. In the drawing, 1 is a strip, 2 is an inlet bridle, 3 and 7 are tension meters, 4 is a skin pass mill, 5 is an intermediate bridle, 6 is a leveling mill, 8 is an outlet bridle, 9 is a main motor, and 11 is an inlet. 12 is an input side differential gear, 15 is an output side differential gear, and 16 is an output side stretching DC motor.

Claims (1)

[Claims] 1. An automatic operation method for a tension leveler, which consists of an entry bridle, a skin pass mill, an intermediate bridle, a leveling mill, and an exit bridle, which are arranged in this order. The input side bridle is set in the calculator so that the speed difference between the input side bridle and the intermediate bridle and the speed difference between the intermediate bridle and the exit side bridle are constant according to the given elongation rate. and controlling the speed of the exit bridle, while determining the rolling force of the skin pass mill based on the data and controlling the rolling force of the skin pass mill, and determining the rolling reduction amount of the leveling mill based on the data. An automatic operation method for a tension leveler characterized by controlling the reduction amount of a leveling mill.