JPS6045004B2 - Dual-purpose multi-stage rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-high rolling mill such as a Sendzimir rolling mill capable of performing both normal rolling and temper rolling.

Conventional multi-stage rolling mills such as Sendzimir rolling mills are capable of large reduction rolling, and their rolling mechanism outputs on the order of about 100 parts.

For this reason, the absolute value of the rolling error amounted to several tons. Recently, attempts have been made to perform temper rolling using a multi-high rolling mill. In the case of using a multi-stage rolling mill, the diameter of the rolling rolls is small, so the required rolling blade is as low as several tons. For this reason, when skin pass rolling is performed in a multi-high rolling mill, the error of the rolling blade is approximately at the same level as the required rolling blade, so there is a problem that the rolling accuracy is low and it is not possible to perform the desired skin pass rolling. The present invention solves these problems, and aims to perform skin pass rolling with high precision in a multi-high rolling mill that also has the function of skin pass rolling.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in drawings, taking a Sendzimir rolling mill as an example of a multi-high rolling mill.

FIG. 1 shows a side view of the upper half of a known Sendzimir rolling machine, in which six rolling rolls each on the upper and lower sides and four backup bearing groups on the upper and lower sides are arranged vertically symmetrically with a rolling material a in between.

1 is a rolling roll, 2 is a first intermediate roll, 3 is a second intermediate roll, 4 is a backup bearing, and 5 is a rolling rack, and as the rolling rack 5 rises, rolling blades are added to the rolling roll 1. be done.

FIG. 2 shows the vertical drive mechanism of the reduction rack 5, and 6 is a pair of rotary actuators connected to the reduction rack 5. Pressure oil conduits 7 are connected to the upper and lower parts of each rotary actuator 65. has been done.

Reference numeral 8 denotes a servo valve, which is configured so that the pressure of pressure oil introduced from a pressure oil source (not shown) is regulated by the servo valve 8 and supplied to the rotary actuator 6.

Note that ΔP indicates a differential pressure gauge. When adding reduction blades to the rolling rolls, the servo valve 8 is operated in response to a command from a control device (not shown) to apply hydraulic pressure to the pressure oil conduit 7a, and the impellers 17 of each rotary actuator 6 are symmetrically moved downward. The rotary actuator 6 rotates in the direction of the arrow A, a'', and a pinion connected to the rotation shaft of the rotary actuator 6 rotates, so that the lowering rack 5 operates in the direction of the arrow b.

The actuation of the reduction rack 5 rotates a pinion attached to the shaft eccentric 22 of the back-up bearing, which in turn rotates the shaft of the back-up bearing as is known in the art. The axis of the back-up bearing is supported by an eccentric support device, so that the back-up bearing is pushed towards the rolling roll 1 and rolls down the rolling roll. In the rolling mechanism of the conventional multi-stage rolling mill as shown in FIG. 2, the present invention connects a hydraulic cylinder smaller than the rotary actuator 6 to the rolling rack 5, and also connects a second hydraulic cylinder between the rotary actuator and the servo valve. A feeding path is provided, and a pressure oil feeding switching means is attached to the second pressure oil feeding path and the conventional pressure oil feeding path, and pressure oil is applied to the rolling rack between the rotary actuator and the eccentric ring of the rolling rack. The present invention is characterized in that a tension detector is provided to detect tension, and a servo valve can be controlled by a signal from the detector.

The present invention will be explained with reference to the embodiment drawings shown in FIG. In FIG. 3, the same numbers as in FIG. 2 have the same names and functions. 9 is rotating actie! It is a small hydraulic cylinder with a smaller output than the motor 6 (total of two),
It is connected to the end of the lowering rack 5 on the rotation actuator 6 side.

Reference numeral 10 indicates the second pressure oil conduit connected between the hydraulic cylinder 9 and the servo valve 8; 11, 12, 13, 514;
, 15 and 16 indicate solenoid valves as pressure oil supply switching means.

Next, the operation will be explained.

When performing normal cold rolling, the solenoid valve 11,
12 and 13 to the A side, solenoid 4 id valve 1
4, 15, 16 are position controlled on the mouth side, and hydraulic cylinders 9
By blocking the flow path of pressure oil to the servo valve 8, all of the pressure oil flowing out from the servo valve 8 is supplied to the rotary actuator 6 through the first pressure oil conduit 1a, and as described above, the pressure oil is 5 is activated, a reduction blade is added to the rolling roll, and normal rolling is performed.

Note that the hydraulic cylinder 9 is interlocked with the operation of the reduction rack 5, but since the solenoid valve 15 is open, the pressure oil above the hydraulic cylinder 9 is communicated through the path of the pressure oil conduit 10b1, the solenoid valve 15, and the pressure oil conduit 10a. Therefore, the hydraulic cylinder 9 does not pose any hindrance during normal rolling. Next, when performing skin pass rolling with a small required reduction blade, control the positions of the solenoid valves 11, 12, 13 to the mouth side, and control the solenoid valves 14, 1
Control the positions of 5 and 16 to the A side.

The pressure oil controlled by the servo valve 8 flows through the pressure oil conduit 10a.
1 to the hydraulic cylinder 9 through the solenoid valve 14, the hydraulic cylinder and the reduction rack 5 are operated, and reduction blades are added to the rolling roll in the same manner as described above to perform temper rolling. In this case, the rotary actuator 6 will be interlocked with the operation of the reduction rack 5, but since the solenoid valve 12 is open, the pressure oil in the rotary actuator 6 will flow through the pressure oil conduit 7b1 and the solenoid valve 12, causing the rotary actuator 6 to rotate. It circulates to the actuator 6, and the movement of the hydraulic cylinder 9 is not hindered in any way.

The purpose of the present invention is to compensate for the rolling error caused by the sliding resistance of the impeller 17 interlocking with the hydraulic cylinder 9 during the temper rolling.

In FIG. 3, 17'' is a tension detector that detects the tension applied to the reduction rack 5 between the rotary actuator 6 and the eccentric wheel 22 of the backup bearing, and a load cell or the like is used, for example.

Reference numeral 19 indicates an A/D converter, and 20 indicates a servo valve control device which calculates the difference between the tension applied to the reduction rack when the sliding resistance of the impeller 17 is zero and the detected tension and inputs it to the servo valve 8.

During temper rolling, a signal from the servo valve control device 20 is input to the servo valve 8, and the hydraulic oil pressure of the rotary actuator 6 is adjusted by the servo valve 8 by an amount corresponding to the loss of the rolling blade due to the sliding resistance of the impeller 17. This compensates for the rolling error.

An example of the tension detector 17'' is shown in FIG.

A load cell 23 is embedded in the inner periphery of the stress ring 24, and when tension is applied to the rolling rack 5, the stress ring 24 is compressed via the chains 25 and 26, so that the inner periphery of the ring 24 expands and contracts. is detected by the load cell 23,
Convert this to tension. Also, you can use a strain gauge instead of the load cell 23! Alternatively, a piezoelectric element or the like may be used instead of the stress ring 24. Table 1 shows SUS3O4
A stainless steel strip (2.h thick) was rolled at a rolling speed of 50T when using the apparatus of the present invention shown in Fig. 3 and when using the conventional apparatus shown in Fig. 2! 1. /Min and the elongation rate of the strip is 1.
An example will be shown in which temper rolling is performed with a target of 0%.

The hydraulic cylinder of the present invention has an inner diameter of 105w! n rod diameter 807707! I used the one from In the conventional lowering device (rotary actuator), the maximum pressure of the servo valve is 1
At 40k9/d, the control pressure error of the servo valve is 1.4
k9/Clt, and the differential pressure required for temper rolling is 4.5~
5k9/Clt, and the packing sliding resistance of the rotary actuator is about 1.5k9/Cd, so the rolling down control accuracy is 58 to 64%.

In the comparative example and the rolling device of the present invention, the maximum pressure of the servo valve is 140 kg/Clt, and the control pressure error of the servo valve is 1.4 k9/Clt, and since the rolling blade required for skin pass rolling is a small cylinder, the servo valve is The control pressure of the valve has 40-42 kg/Crft.

In the comparative example, since an error due to the sliding resistance of the rotary actuator remains, the reduction control accuracy is 6.9 to 7.25%.
On the other hand, in the example of the present invention, the sliding resistance of the rotary actuator can be ignored because it is corrected, so the reduction control accuracy is 3.
．． We were able to achieve a significant improvement of 3 to 3.5%.

[Brief explanation of the drawing]

Fig. 1 is a side view of the upper half roll of a known Sendzimir rolling machine, Fig. 2 is an explanatory diagram showing the vertical drive mechanism of a normal rolling rack, and Fig. 3 shows the rolling mechanism circuit used in the rolling mill of the present invention. The explanatory diagrams shown in FIGS. 4A and 4B are a front view (A-A arrow view) and a side view (B-B arrow view) showing a specific example of the tension detector. 1...Rolling roll, 2, 3...Intermediate roll, 4...Backup bearing, 5...
Press down ratunoku, 6... Rotating actuator, 7
... Pressure oil conduit, 8 ... Servo valve,
9... Hydraulic cylinder 10... Second pressure oil conduit, 11, 12, 13, 14, 15, 16...
・Solenoid valve, 17″...Tension detector, 19
... A/D converter, 20 ... Servo valve control device, 22 ... Eccentric wheel.

Claims (1)

[Claims] 1. In a multi-stage rolling mill in which a first pressure oil supply path for feeding pressure oil to a rotary actuator via a servo valve, and a rolling rack connected between the rotary actuator and an eccentric ring of a backup bearing, the A hydraulic cylinder smaller than the rotary actuator is connected to the rotary actuator side end of the reduction rack, and a second pressure oil supply path is provided between the hydraulic cylinder and the servo valve, and the second pressure oil supply path is provided between the hydraulic cylinder and the servo valve. A pressure oil supply switching means is attached to the pressure oil supply path and the first pressure oil supply path, and tension applied to the reduction rack is reduced between the rotary actuator of the reduction rack and the eccentric ring of the backup bearing. 1. A dual-purpose multi-high rolling mill characterized in that a tension detector is provided to detect tension, and a servo valve can be controlled by a signal from the detector.