JPH05123735A - Method and device for controlling leading/guiding device for rolling wire rod - Google Patents

Abstract

PURPOSE:To decrease the generation of flawing and misroll of a wire rod, and to obtain the wire rod whose dimensional accuracy is excellent. CONSTITUTION:This control method is used to control opening and closing of a roller interval and setting of a position in a leading/guiding device provided with a hydraulic cylinder for adjusting an interval of rollers for leading and guiding a rolling wire rod, a detection of the tip part of the wire rod and a detection of the tail part of the wire rod are executed automatically, opening and closing of the roller interval and setting of a position of the rollers are executed by a pressure difference between a push side chamber 21 and a pull side chamber 22 of a hydraulic cylinder 8, and when pressure of the push side and the pull side is set to the same pressure, the rollers stop by a balanced pressure in the hydraulic cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a guide device for a rolled wire rod or rolled rod and a control device therefor.

[0002]

2. Description of the Related Art In order to roll a wire rod having excellent dimensional accuracy, the deviation in diameter of the wire rod, that is, the difference between the maximum diameter of the wire rod and the minimum diameter of the wire rod and the minimum diameter of the wire rod is 0 and 0. It is necessary to make the numerical values close to each other. Therefore, a guide device is installed at the entrance of each rolling stand to guide the wire rod into the hole shape of the rolling roll in a normal posture.

By the way, in the conventional guide apparatus, the roller interval for guiding the wire rod material into the roll hole type of the rolling mill is narrowed to the minimum necessary and fixed according to the diameter of the wire rod material to be rolled. I was using it. Further, as another conventional example, for example, a guide guide device described in JP-A-60-40933 is proposed. According to this guide device, the roller is fixed at a predetermined interval until the wire rod is bitten into the rolling mill by using the hydraulic cylinder, and after the wire rod tip is bited, the wire rod tail end is A control method is used in which the roller interval is narrowed until the part (rear end part) passes through between the rollers, and the roller is returned to the predetermined interval after the tail end part of the wire rod material is removed.

[0004]

In the former conventional example, since the roller interval is fixed to the minimum necessary limit, the guiding action is good, but the tip of the wire rod material is set to the roller against the dimensional fluctuation of the wire rod material. Since there is a problem that misrolling is likely to occur due to being caught or the like, in practice, the roller spacing is set to be widely adjusted by always adding the dimensional variation to the dimensional variation of the wire rod material. However, at the time of guiding and guiding, the wire rod member is inclined by the widened portion, so that the dimensional accuracy of the wire rod member is impaired.

According to the latter conventional example, after the wire rod material is bitten into the rolling mill at the time of guiding and guiding, the roller narrows the wire rod material due to the magnitude of the pressure applied to the hydraulic cylinder. Although the problem of pointing out the tip of the wire rod material can be avoided and the dimensional accuracy of the wire rod material is impaired as pointed out in the former conventional example does not occur, the following problems occur. is there.

That is, firstly, if the set pressure applied to the hydraulic cylinder is large, the wire rod material clamped by the rollers may be deformed or surface flaws may occur depending on its size and strength. However, there is a disadvantage in that the pressure applied to the hydraulic cylinder must be adjusted each time so as to make it a narrow pressure suitable for the wire rod material in accordance with the size and strength of the wire rod material.

Secondly, at the time of adjustment, if an error occurs in the timing of narrowing the roller interval and the timing of closing the roller is fast, the tip end of the wire rod material may hit the roller, and the timing of closing the roller may be delayed. The problem is that the dimensional accuracy of the wire rod material deteriorates. This problem will be described in detail.

In order to improve the dimensional accuracy of the wire rod material, it is desirable that the timing for narrowing the roller interval be the same as the time when the wire rod material is caught in the rolling mill. Therefore, in the method according to this conventional example, after detecting the tip of the wire rod material by the detector, the hydraulic directional control valve is operated at the time set by the timer to supply the amount of oil to the hydraulic cylinder, and thus the roller spacing is increased. Is narrowing. However, there is a sliding gap as an unavoidable problem in the structure of a hydraulic system. Therefore, the internal leakage amount may increase or decrease in the hydraulic system due to the change in oil viscosity due to the change in oil temperature, and the hydraulic pressure supply amount may not be constant.In that case, the operating time of the stroke of the hydraulic cylinder may fluctuate. An error occurs in the timing of narrowing the roller interval, and as described above, the timing of closing the roller is early or late, so that the tip of the wire rod sticks to the roller or the timing of closing the roller is delayed, so The dimensional accuracy of the bar is poor. Therefore, in order to prevent such problems from occurring, the operating time of the hydraulic cylinder can be adjusted by adjusting the increase / decrease in the amount of oil supply according to the dimensions of the wire rod material, and the oil temperature can be kept constant. It is conceivable to devise a different device or adjust the timer time. Further, similarly to the speed fluctuation of the wire rod member, the operating time of the hydraulic cylinder is adjusted and the timer is adjusted. However, it is difficult to keep the oil temperature constant at all times, and the viscosity of the oil used also changes depending on the operating temperature. Therefore, the internal leakage amount in the hydraulic system does not become constant either. It is very difficult to solve the problem that the operating time of the hydraulic cylinder is not constant. For this reason, it is unavoidable to rely on the adjustment of the timer time after the detection of the wire rod tip portion, but this is also affected by the change in the operating time of the hydraulic cylinder, which is extremely difficult.
Therefore, when the wire rod material is caught in the rolling mill, an error in the timing of narrowing the roller interval is unavoidable.

Regarding the timer control by detecting the tip of the wire rod material, when the interval between rolling mills is short or when the rolling material passes continuously, a quick response is required at the detection position. There is a time limit on the response speed that occurs due to the functions of the timer, control valve, and hydraulic cylinder, so this guide device cannot be used when a response higher than this time limit is required. ..

As described above, in the latter conventional example, in order to obtain a rolled wire rod having excellent dimensional accuracy, the rolled wire rod is appropriately timed depending on the state of rolling and the size and shape of the rolled wire rod. It is necessary to adjust the roller spacing of the guide and guide device, but in actual operation, the roller spacing should be adjusted to the wire rod material during rolling.
It is difficult to instantaneously adjust the timer, the pressure, and the hydraulic oil supply amount according to the speed and size and shape of the wire rod to operate at the optimum position in terms of dimensional accuracy. In reality, there are some wire rod rollings that cannot be used even if it is desired to use this induction device, because there is a certain limit in obtaining a highly accurate product and in terms of time limitation.

An object of the present invention is to solve the problems of each adjustment of the guide device in order to improve the dimensional accuracy of the wire rod material.
By automatically operating the roller spacing according to the size and shape of the rolled wire rod and solving the response time limitation of the induction device for the wire rod, the wire rod will not be damaged or misrolled during any rolling. To obtain a wire rod material having excellent dimensional accuracy.

[0012]

In the method for controlling a guide device for a rolled wire rod according to the present invention, opening and closing of the roller gap and fixing of the roller position of the guide device are applied to the pushing side chamber and the pulling side chamber of the hydraulic cylinder. It is performed by controlling the pressure difference. The control device of the present invention includes a hydraulic cylinder having the same area of the pushing side chamber and the pulling side chamber for opening and closing the roller attached to the guide device, a detector for detecting the stroke of the hydraulic cylinder, and a hydraulic cylinder pressure. And a control device for controlling the.

The pressure side and the pull side of the hydraulic cylinder always have a pressure due to the hydraulic pressure supplied by the hydraulic pump device, and the pressure is adjusted by the pressure control valves on the push side and the pull side, respectively. When the pressure on the pushing side and the pressure on the pulling side are the same, the roller becomes a pressure balanced state in the hydraulic cylinder and stops. For example, the pressure control valve on the pull side has a fixed pressure value, and the pressure control valve on the push side has a pressure value set by an electric signal, and this electric signal is set by a setter of the control device. To be controlled. The detector that detects the stroke of the hydraulic cylinder is intended to confirm and maintain the setting position of the roller, and the detector sends a feedback signal to the control device until the setting position of the control device is maintained.
Continue until it becomes equal to the setting signal to the pressure control valve,
The hydraulic cylinder operates due to the pressure difference so that the signal of the setter continues to flow, and the detector signal becomes equal to the setter signal until the pressure difference becomes 0 and the hydraulic cylinder stops.

Since the difference between the setting signal from the setter and the feedback signal from the detector is the pressure difference, and the roller stop position is the pressure balance position, any position within the stroke range of the hydraulic cylinder can be considered. Can be set with.

[0015]

A significant problem of the conventional guide guide device using a hydraulic cylinder for obtaining a rolled wire rod having excellent dimensional accuracy is how to solve the timing error of tying the rolled wire rod. The action of the present invention also places the highest priority on solving the timing error when the roller binds the wire rod member. The operation of the present invention will be described below.

Since the pressure balance of the hydraulic cylinder can be arbitrarily adjusted by the feedback signal of the detector and the setter signal, the roller spacing of the guide device is determined to be the required minimum dimension smaller than the wire rod dimension before rolling. The position is set to the pressure balance position and the roller interval is stopped. In this state, the tip of the wire rod advances toward the rolling mill, so that the tip of the wire rod comes into contact with the roller. Since the roller is stopped due to the pressure balance of the hydraulic cylinder,
When an external force due to contact is received, the roller automatically moves in the opening direction, and the hydraulic cylinder and detector also move, so the detector sends a feedback signal to the control device, an electric signal flows to the electromagnetic pressure control valve, and an electromagnetic pressure control valve The set pressure changes, and due to the pressure difference between the pushing side chamber and the pulling side chamber of the hydraulic cylinder, the roller gap binds the wire rod member by the action of returning to the initial pressure balance position.

Therefore, while the wire rod is passing, the roller continues to bind the wire rod due to the pressure difference of the hydraulic cylinder,
When the tail end of the wire rod passes, it automatically returns to the pressure balance position and stops. This guide device automatically detects the tip of the rolled wire rod and instantly binds the wire rod, and keeps the binding until the tail end of the wire rod passes and keeps the tail end of the wire rod. After passing, the roller gap is an automatic guide device that automatically returns to the pressure balance position and stops.

Further, the tying force of the rollers can be made constant by adjusting the control device, or the rolling stage can be provided by adjusting the distance between the rollers, and the rolling wire rod can be used in combination with other control signals. Since the binding force control suitable for the material can be set, it is possible to eliminate problems such as flaws and deformation of the wire rod material.

Since the stop position of the roller can be easily set within the range of the hydraulic cylinder stroke, the range of wire rod dimensions that can be used by the guide device is widened, and the conventional guide device by changing the wire rod member size is used. This will reduce the replacement of the products and increase the production volume.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below together with a guide device for a rolled wire rod. As shown in FIGS. 2 and 3,
A pair of roller holders 3 are attached to a guide box 2 of the guide device 1 so as to be rotatable around a fulcrum pin 6. A roller pin 12 is provided at one end of each roller holder 3.
A roller 4 pivotally supported on the guide box 1 and a link 7 are attached to the other end.
Is fixed, and a U-shaped slider 10 is attached to the tip of the rod of the hydraulic cylinder. Link 7 is guide pin 1
1, the roller holder 3 and the slider 10 are connected. Since the slider 10 moves following the expansion and contraction of the hydraulic cylinder 8, the roller holder 3 is rotated around the fulcrum pin 6 by the link 7, and the rotation causes the gap between the rollers 4 and 4 to be opened and closed.

In the hydraulic cylinder 8, the pushing side chamber 21 and the pulling side chamber 20 have the same area as shown in FIG. The hydraulic cylinder 8 includes an electromagnetic pressure control valve 15 and a pressure control valve 16 controlled by the hydraulic pump device 13 and the control device 18.
Is hydraulically controlled by. The pushing side chamber 21 and the pulling side chamber 20 of the hydraulic cylinder 8 are constantly supplied with hydraulic pressure by the hydraulic pump device 13, and the pressures thereof are respectively controlled by the pushing chamber side electromagnetic pressure control valve 15 and the pulling chamber side pressure control valve 16. Is being adjusted. Push side chamber 2 of hydraulic cylinder 8
1 and the pull-side chamber 20 generate a pressure difference, so that the rollers 4,
4 is opened and closed, and when the pressures on the pushing chamber side and the pulling chamber side are the same, the hydraulic cylinders are in a pressure balanced state and the rollers stop.

In this way, the rollers 4, 4 of the guide device 1 are
The hydraulic cylinder 8
The pressure difference between the push side chamber 21 and the pull side chamber 20 is controlled. Reference numeral 14 is a flow dividing valve, 19 is a prime mover, 22 is a pressure gauge, and 23 is a hydraulic tank.

Detector 9 provided on the hydraulic cylinder 8
Is to generate a seed back signal according to the stroke of the hydraulic cylinder.

The electromagnetic pressure control valve 15 is a pressure control valve whose pressure is determined in proportion to the input current value, and its electric signal is the electric signal of the setting device 1.
The electric signal of 7 and the feedback signal of the detector 9 are adjusted by the controller 18 and sent to the electromagnetic pressure control valve.

Next, the control method will be described. Before rolling, the roller spacing of the guide device 1 is adjusted to a required minimum dimension position smaller than the wire rod dimension by the setting device 17, and the hydraulic cylinder 8 is stopped in a pressure balanced state. Rolling starts, the tip of the wire rod advances toward the rolling mill, and eventually the tip of the wire rod comes into contact with the roller 4 set at an interval smaller than the dimension of the wire rod. Since it is in a balanced state, that is, a so-called loose state, when the wire rod material comes into contact with the rollers 4 and 4, the roller 4 moves in the opening direction, the detector 9 issues a feedback signal, and the controller 1
An electric signal is sent from 8 to the electromagnetic pressure control valve 15 to change the set pressure value to a high pressure, and the wire rod is bound by the rollers 4 and 4 due to the pressure difference with the pressure control valve 16. Since the interval between the rollers 4 and 4 set at the beginning is smaller than the dimension of the wire rod material, the tie state is continued during the passage of the wire rod material, and when the tail end of the wire rod material passes the rollers 4 and 4, The interval of 4 returns to the position before passing the wire rod and stops in the pressure balanced state. This series of operations are all automatically performed according to the movement of the wire rod material, and the interval setting position of the rollers 4 and 4 can be remotely and easily performed at any position within the stroke range of the hydraulic cylinder 8. In addition, the force for tying the wire rod can be adjusted easily and instantaneously in an appropriate amount according to the steel type and size.

Regarding responsiveness and repeatability as well, since the hydraulic pressure control is based on pressure propagation, there is no change in operating time due to changes in oil temperature as in the conventional case, the response is fast, and stable operation is possible even in repeated operation.

Therefore, according to the control method and apparatus of the guide device for rolled wire rod material, the roller of the guide device is surely bound to the wire rod material at the moment when the wire rod material is caught in the rolling mill. Since the operation is stable, it is possible to solve the problems of the conventional method and perform wire rod rolling with excellent dimensional accuracy. Furthermore, this control method can be combined with a rolling mill and can be centrally controlled by remote control or computerized for all the guide guide devices used for rolling.

[0028]

According to the present invention, when the roller comes into contact with the tip of the wire rod material, the roller of the guide device automatically and instantly binds the wire rod material, so that the tip end portion of the wire rod material is securely attached to the rolling mill. Can be guided to the wire rod, and the dimensional accuracy of the wire rod material is improved. Further, a detection device for detecting the tip of the wire rod and the tail end of the wire rod for timing the tying of the wire rod using the conventional hydraulic cylinder, and a switching device for switching the hydraulic cylinder to open and close the roller. The effect is that no adjustment device is required to stabilize the oil amount.

Furthermore, according to the present invention, with respect to the problems of deformation of the wire rod material and surface scratches due to the large set pressure of the conventional hydraulic cylinder, according to the present invention, the pressure of the hydraulic cylinder is high when the roller gap is large, and It is possible to automatically control the pressure to decrease as the interval decreases.
Also, since the pressure setting range can be adjusted freely and easily, it is possible to guide and guide the rolling mill with a control method and tie force suitable for the wire rod material, and prevent the wire rod material from being deformed and surface scratches from occurring. be able to. Therefore, by using the guide device and control method for a rolled wire rod according to the present invention, it is possible to produce a rolled wire rod having dimensional accuracy superior to the conventional one. As for the range of use of the guide system, if the roller stop position is within the stroke range of the hydraulic cylinder, it is possible to easily set any position by remote control. The replacement of the guide device due to the change in the bar material size is reduced, the down time of the rolling line can be shortened due to the replacement, and the production amount of the rolled wire bar material can be increased.

[Brief description of drawings]

FIG. 1 is a circuit diagram.

FIG. 2 is a plan view schematically showing a rolling wire rod guide device.

FIG. 3 is a side view schematically showing a rolling wire rod guide device.

[Explanation of symbols]

 1 Guide device 3 Roller holder 4 Roller 8 Hydraulic cylinder 9 Detector 13 Hydraulic pump 15 Pressure control valve 16 Pressure control valve 17 Setting device 18 Control device 20 Cylinder pulling side chamber 21 Cylinder pushing side chamber

Claims (2)

[Claims] 1. A control method for controlling opening / closing of a roller gap and position setting in a guide guide device having a hydraulic cylinder for adjusting a gap between rollers for guiding and guiding a rolled wire rod. It automatically detects the tip end and the tail end of the wire rod, and opens and closes the roller gap and sets the position of the roller by controlling the pressure difference between the pushing side chamber and the pulling side chamber of the hydraulic cylinder. Therefore, the roller is opened and closed by the pressure difference between the pushing side chamber and the pulling side chamber of the hydraulic cylinder,
A method for controlling a guide device for a rolled wire rod, characterized in that when the pressures on the pushing side and the pulling side are the same, the rollers are brought into a pressure balanced state in the hydraulic cylinder and stopped. 2. A hydraulic cylinder mounted on a guide device and having the same pressure receiving area in the pushing side chamber and the pulling side chamber, a detector for detecting a stroke of the hydraulic cylinder, and a pressure for controlling the hydraulic cylinder. And a control device having a setting device for setting the pressure on the pushing chamber side, wherein the detector sends the movement amount of the hydraulic cylinder to the control device by a detection signal. Control device for guiding and guiding device for rolled wire rod.