JPS61199506A - Rolling mill - Google Patents

Abstract

PURPOSE:To detect extremely accurately roll gaps and to set well-balanced roll gaps by incorporating position detectors in load-loading devices provided respectively to the work roll chocks of a rolling mill. CONSTITUTION:A position detector 10 constituted of a pair of a position detecting bar 13 and a position detecting head 14, is provided to the inside of each of hydraulic balancing cylinders 9a, 9b provided to each roll chock 8 of multiple work rolls 1-4. The average value of outputs Ca, Cb of electric signals, outputted in accordance with the displacements of the heads 14 of bars 13 of respective cylinders 9a, 9b, is transmitted to a treating unit to detect accurately a roll gap. Hydraulic pressures of hydraulic balancing cylinders 9a, 9b adjusted based on the detected values, to keep the gaps of multiple work rolls in well balance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rolling mill, and more particularly to roll position detection in a rolling mill.

[Prior Art] For example, a strip is rolled by being continuously passed through three rolling buses formed by a pair of work rolls and an outer work roll placed outside so as to sandwich the work rolls! ! l! Eleven-stand multi-bus rolling mills are already known. According to such a rolling mill, one stand can perform the rolling equivalent of three rolling stands, so there is an advantage that the entire rolling equipment can be downsized and equipment costs can be reduced. . Therefore, in such rolling mills, as in ordinary four-high rolling mills, it is important to properly manage the roll gap in order to maintain the product thickness, prevent material meandering, and improve rolling efficiency. It is also important for stabilization.

[Problems to be Solved by the Invention] However, in this type of multi-bus rolling mill, the shaft boxes of the work rolls are each supported by the pressure of a balance cylinder, and have a so-called floating structure with no position reference. The amount of gap for each pass can only be estimated based on the value detected by the reduction cylinder, and the gap is not directly measured, so it cannot necessarily be said to be an accurate value.

The present invention was developed in view of the above circumstances in an attempt to accurately measure each roll gap.
゛Means for Solving Problem E] The rolling mill of the present invention is characterized in that: - a position detector is provided in a load applying device provided between each work roll shaft box; , each roll gap can be accurately measured in close proximity to the roll gap.

[Example] Hereinafter, the present invention will be described in detail based on the drawings.

In FIG. 1, 1, 2, 3.4 are work rolls, 5.
6 is a back roll, 7 is a deflector roll, 8 is an axle box that supports the shaft end of each work roll 1, 2, 3.4, 9a
, 9b is a balance cylinder provided at the front and rear in the line direction between each axle box 8.8, and 10 is each balance cylinder 9a, 9b.
A position detector consisting of a digital displacement meter (for example, the product name Magnescale) or an analog displacement meter (for example, a differential transformer) installed on the piston of S.
is a strip.

In such a configuration, the strip S is attached to the work roll 1
．． In the first pass of 2H, the material is continuously rolled through a second bus between the work rolls 2.3 via the deflector roll 1, and a third bus between the work rolls 3.4 via the deflector roll 1.

Now, when measuring the gap of each bus, each axle box 8.
The position detectors 10 of the front and rear balance cylinders 9a and 9b between the cylinders 8 and 8 detect the positions of the pistons, respectively. Then,
In this case, the detected value of the position detector 10 on the balance cylinder 9a side is Ca, and the position detector 1 on the balance cylinder 9b side is Ca.
If the detected value of 0 is cbCa + Cb, the detected values are averaged as 2, and the averaged value is used as the measured value.

In this way, the roll gap of each bus can be measured at a position close to the roll gap. Therefore,
Compared to the conventional case where each roll gap is determined from the piston position of a reduction cylinder located at a distant position, extremely accurate measurement values can be obtained.

FIG. 2 shows an embodiment in which a position detector 10 is provided within the balance cylinder. In Fig. 2, 8a is the upper shaft box, ab
1 is the lower shaft box, 9 is the cylinder, 11 is the piston, 12 is the seal, 13 is the bar of the position detector, 14 is the head of the position detector, 15 is the cable for taking out the output of the position detector, 1
6 is an oil chamber inside the cylinder.

In the figure, the bar 13 of the position detector is fixed to the piston 11 and the head 14 is fixed to the cylinder 9. As the piston 11 moves up and down inside the cylinder 9, the bar 13
slides within the head 14, and as a result, an electrical signal corresponding to the piston displacement is output from the head 14 through the cable 15. This is processed by an appropriate processing circuit (not shown),
The piston position I16 is to be determined.

It should be noted that the present invention is not limited only to the above-mentioned embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the rolling mill of the present invention, the roll gap can be measured extremely accurately because a detector is provided in the direction loading device between the axle boxes. It can have excellent effects.

[Brief explanation of drawings]

1vA is a detailed explanatory diagram of the present invention, and FIG. 2 is an embodiment in which a position detector is provided within the balance cylinder. 1.2, 3.4 Harnia crawl, 8 is axle box, 9a
, 9b is a balance cylinder, and 10 is a position detector. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Patent applicant Nippon Steel Corporation Patent applicant Toshiba Corporation

Claims (1)

[Claims] 1) A rolling mill characterized in that a position detector is provided in a load applying device provided in a work roll shaft box.