JPS5833111A - Method for measuring slip between rolls in rolling mill - Google Patents

Abstract

PURPOSE:To measure the slip between a driving roll and a working roll highly accurately, by counting pulses which are synchronized with the rotation of the driving roll, with the period, at which a rotating signal generating part provided in the working roll crosses the vicinity of a displacement gage, as a counting interval. CONSTITUTION:A working roll rotating signal VW is generated by the fact that the rotating signal generating part 3 that is provided at one end of the working roll 2 passes the vicinity of the displacement gage 4 by the rotation of the working roll 2. The signal VW is imparted to a tracking filter 7. A rotating signal VW buried in noises is extracted. The pulse signal is sent out as a read out signal for memory 10 with respect to a counter 9 and as a reset signal for the counter 9 through a delay circuit 11, via a rising detector 8. Meanwhile, the pulse synchronized with the rotaion of the driving roll 1 are outputted from a pulse generator 6 and sent to a processor 13 through the counter 9 and the memory 10. A parameter which is required to determined the number of pulses when the slip is not present is sent from an operating board 12. Then the slip quantity S is computed, and the slip between rolls is measured highly accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention measures the slip between a drive roll and a non-driven work roll in a multi-stage rolling mill, which is a general term for a 4-high rolling mill, a 6-high rolling mill, or a cluster rolling mill. Regarding the method.

Measuring the slip between rolls in a rolling mill is important in terms of product quality control, yield control, and operation control. For example, in multi-stage cold rolling 5Kt11 in which a roll other than the work roll is used as a drive roll, the drive of the work roll is transmitted by contact resistance between the rolls. This slip between the rolls occurs, causing surface flaws on the work roll due to the slip between the rolls, resulting in a decrease in product quality. In order to prevent this, it is important to understand the rotational behavior of one work roll.

In the conventional method, a rotation speed detection end consisting of a tachometer generator or an AA pulse generator is attached to both the work roll and the drive roll, and the rotation speed ratio between the two is calculated analogously or digitally counted. The amount of slip was measured.

However, the above conventional method has the following drawbacks.

In other words, since the work roll body and the rotation speed detection end are directly connected, each time the work roll is replaced or the nozzle line is changed, the installation position of the rotation speed detector must be readjusted, which is troublesome and difficult to install. There was a problem that detection accuracy decreased when the position changed.

The present invention is a psychokinetic method that solves the above-mentioned problems in measuring slip between rolls, and its contents will be explained in detail below.

The method of the present invention includes a round eye rotation signal generating member formed by radially providing convex portions made of metal pieces or the like or concave portions formed by carving, which are fixedly fixed at equal intervals from the center of the circle on the end face of the work roll;
A non-contact 00 rotation detector is constructed with a companion displacement needle placed adjacent to the wrinkled member.

With this detector, the structure is such that there is no need to readjust the installation position of the detector even if the diameter of the work roll or the nozzle line is changed.

The present invention provides a device configured as described above, in which the period in which the rotation signal generating member crosses the vicinity of the displacement needle as the work roll rotates is defined as a counting interval, and in this counting interval, the rotation signal is synchronized with the rotation of the drive roller. By counting the pulses,
Measuring the slip between the drive roll and the work roll
-** and swee.

Note that the displacement meter output as a rotation detector includes a lot of noise due to vibrations of the rolling mill. Therefore, one embodiment of the present invention synchronizes with the rotation of the work roll, which is buried in noise, and generates a ratio signal approximately at the line speed. The t-feature is used to improve the 4-ratio as a preprocessing of the work roll rotation signal by removing and extracting noise through a tracking filter.

Hereinafter, embodiments of the present invention will be described based on an example in which the present invention is applied to the upper roll of a four-stage compressor shown in FIG.

1 is a drive roll, 2 is a work roll, a rotation signal generating member of the three companies' work rolls, and 4 is a displacement needle disposed adjacent to the rotation signal generating member. 5 is an electric motor, and 6 is a nose pulse generator for generating a nose pulse synchronized with the rotation of the drive wheel, Bt.
is the material to be rolled.

Figure 2 shows the work roll rotation signal vy which is the output of the displacement meter 40.
, and the drive roll rotation signal VDt which is the output of the /Cellus ji raw II exposure shows, if the 2nd I! (If slip between rolls does not occur as in 0), the number of VD pulses generated during the VW reversing cycle is determined by the diameter of the roll, the gear ratio, and the number of pulses per revolution. becomes the value N.

However, if there is slip between the drive roll and the work roll, for example, one rotation of the drive roll (1-g+Vn
Even if the pulse interval of is constant, the work roll rotation signal v
Since the repetition period of y becomes longer, the number of VDs occurring during the repetition period of vW as shown in Fig. 2(b) increases. The number of lugs increases by α compared to the case without slip, and becomes N+-.

Therefore, the inter-roll slip S is expressed as follows from the correlation between the number of pulses N when there is no slip p and the number N+α of pulses when there is slip.

Figure 3 shows the breakdown of the processing part of Example No. 011 of the present invention.
4, which indicates the ear dam, is a displacement meter, the output of which includes a work roll rotation signal vy.

7 is a tracking filter consisting of a variable frequency filter having a center frequency and a band width proportional to the line speed VsK, and is used to extract the rotational signal Vv with a high ratio due to the noise in the output of the displacement meter 40. It is 〇. S is the start-up i detector.
A sharp pulse is generated at the beginning and end of the return period 0. This is used as a read signal to the counter 9° memory 10, and the delay circuit!
The output through 1 is used as a reset signal for the counter 9. 6 is a pulse v shown in 111 and synchronized with the rotation of the food drive roll.
This is a pulse generator for generating D.

Since the above requires high-speed response for the operation of the device, TTL,
Bars like PLL? Although it is manufactured using hardware, if you set the necessary parameters such as the diameter of the wheel and the gear ratio to determine the amount of rotor N when there is no tongue on the operation panel 12, you can use the memory! 0
The output of @2 is N+α as a result of the arm t-counting in Figure (b), so by using the processing device 13 such as a microcomputer, for example, using (Equation 1) of N'J 6A, It is difficult to calculate the slip amount St.

Note that if the rolling mill has little vibration and the work roll rotation/Grus Q\ ratio output from the displacement meter is excellent, the seven ranking filter 7 may be omitted.

The present invention eliminates the need for a rotation detector and installation position of 1411t, which were conventionally required, and has a high tlf of 64mm.
It is now possible to measure inter-roll slippage at a high glaze level, which was difficult to measure by adding i1, to quantitatively evaluate various parameters necessary for setting operating conditions, or to diagnose abnormalities in rolling conditions directly online. This function performs IZ) fE control such as issuing a warning to the driver and automatic deceleration.

[Brief explanation of drawings]

Figure 1 shows the concept of an embodiment of the present invention applied to the upper roll of a four-high rolling mill, and Figure 2 shows the concept of the invention. II Roll N rotation signal and pivoting - Roll rotation (8
(1) shows the case of slip generation heat, Φ) shows the case of slip generation, and Figure 3 shows the case of slip generation.
3 shows a block diagram of a signal processing portion in the illustrated embodiment. In the figure, i-・IIIII! - roll, 2...work roll, 3-rotation signal generating member, 4-displacement needle, 5...'
fj114h machine, 6...no Lus generator, St...
- Rolled material, 7... Tracking filter, 8...
Rise detector, 9...Count JlO...Me%1c 1
1...Delay circuit, 12...Operation panel. 13.-Processing device. Agent Patent attorney Masamitsu Akizawa et al.24

Claims (1)

[Claims] (1) In a multi-high rolling mill in which a roll other than the work roll is used as a drive roll, a rotation signal generating member provided at the longitudinal end of the work roll causes the vicinity of a displacement needle provided in a stationary portion to be generated by the rotation of the work roll. The pulses synchronized with the rotation of the drive roll are counted in this counting interval, with the period of the ratio signal being synchronized with the rotation of the work roll generated by passing tq! ! The needle side method of slipping between rolls in a rolling mill is characterized by: (2) Claim i!l No. (1) The present invention is characterized in that a signal synchronized with (ro) rotation of a work roll is extracted by following one line speed FiILK and removing noise using nine tracking filters. Described below: How to slip the needle between rolls in a 0-pressure grinding machine.