JP6192606B2 - Rolling equipment - Google Patents

Description

  The present invention relates to a rolling device that heats and rolls a material to be rolled, for example.

Conventionally, a rolling device that continuously hot-rolls a material to be rolled with a rolling roll is known. In hot rolling and the like, since it is necessary to ensure the temperature of the material to be rolled during rolling, techniques for heating the material to be rolled as shown in Patent Documents 1 and 2 have been developed.
In patent document 1, the temperature fall of a to-be-rolled material is prevented by carrying out induction heating of the plate edge part of a to-be-rolled material during rolling. In patent document 2, the to-be-rolled material during rolling is heated (electric current heating) by supplying with electricity to the roll (electricity pinch roll) spaced apart in the sheet passing direction of the to-be-rolled material. In addition to Patent Document 1 and Patent Document 2 described above, a technique called a bar heater is also known in which an entire length of the plate of an induction coil enters a magnetic field in order to heat the entire material to be rolled.

  Now, although it is not the method of heating the to-be-rolled material in rolling as mentioned above, patent document 3 is known as a method of heating material. In Patent Document 3, a pair of electrodes is brought into contact with a material (a material to be heated) charged in a heating furnace, and the material to be rolled is heated by energizing the electrodes.

Japanese Patent Application Laid-Open No. 07-1023 Japanese Patent Laid-Open No. 08-277424 Japanese Patent Laid-Open No. 62-17121

In heating a material such as a material to be rolled, current heating as shown in Patent Documents 2 and 3 is easier and more efficient than the induction heating as shown in Patent Document 1 and is more efficient. It is a heating method.
Here, in Patent Document 3, a pair of electrodes are brought into contact with a material in a heating furnace (a material to be heated), and the electrodes are energized. However, the scale may be sandwiched between the material and the electrode, and a problem such as spark may occur and uniform heating may not be possible. Moreover, when the resistance of the contact portion between the material and the electrode is large, sparks, melting, and the like may occur, and it is difficult to apply the technique of Patent Document 3 to the rolling technique. On the other hand, Patent Document 2 shows that a material to be rolled is heated by energizing between energized pinch rolls. However, as shown in Patent Document 2, in the actual machine using the energized pinch roll, it is difficult to raise the temperature of the material to be rolled up to a high temperature range due to the scale existing on the material to be rolled. Low temperature range. Therefore, in the case where a scale exists on the material to be rolled, there has been nothing but to employ an inefficient heating method such as induction heating, burner heating, or radiation heating.

  Now, when performing rolling of a small lot or simulated rolling of an actual machine, since the size of the material to be rolled is small, the temperature of the material to be rolled tends to decrease during rolling. When the temperature drop causes an increase in rolling load and rolling becomes impossible, it is necessary to increase the temperature (initial temperature) of the material to be rolled at the beginning of rolling, but the initial temperature is increased. As a result, grain growth of the material to be rolled occurs and an appropriate metal structure may not be obtained.

  Then, an object of this invention is to provide the rolling apparatus which can heat a to-be-rolled material efficiently, and can roll continuously, especially the rolling apparatus for experiment.

In order to achieve the above-described object, the present invention takes the following technical means.
Rolling apparatus of the present invention includes a support mechanism for gripping and rolling rolls for rolling the material to be rolled, the both end portions of the material to be rolled in the rolling direction is a direction passing the material to be rolled in the rolling roll, said support wherein by moving the mechanism in the rolling direction and a moving mechanism for applying tension to the rolled material, provided with a heating means for heating by applying current to the material to be rolled which is gripped by the support mechanism, wherein The support mechanism includes a gripping portion that grips both ends of the material to be rolled, and the heating unit applies a current between the gripping portions .

The temperature before the SL material to be rolled with a measurable measuring apparatus, the heating means, based on the measured temperature by said measuring device, and controls the current to be applied.
When a current is applied to the material to be rolled, the rolling roll and the material to be rolled are in a non-contact state.

When the temperature of the material to be rolled becomes a predetermined value or less during rolling of the material to be rolled, after increasing the roll gap amount of the rolling roll and bringing the rolling roll and the material to be rolled into a non-contact state, A current is applied to the material to be rolled by the heating means.
When the rolling roll is electrically insulated from the material to be rolled by a roll material formed of an insulator such as a ceramic roll or a roll coated with an insulator (PVD, CVD, spraying, etc.), When a current is applied to the material to be rolled, the rolling roll and the material to be rolled are brought into contact with each other.

  When the temperature of the material to be rolled becomes equal to or lower than a predetermined value during rolling of the material to be rolled, an electric current is applied to the material to be rolled by the heating means while keeping the rolling roll and the material to be rolled in contact with each other. It is characterized by that.

  According to the present invention, the material to be rolled can be efficiently heated and continuously rolled.

1 is an overall view of a rolling apparatus according to the present invention. It is a figure which supplies with a direct current to a material to be rolled at the time of rolling start. It is a figure which shows during rolling of a to-be-rolled material. It is a figure which supplies a direct current again to a material to be rolled.

Hereinafter, a rolling apparatus according to the present invention will be described with reference to the drawings. In the description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
FIG. 1 is a diagram schematically showing a rolling device for rolling the material to be rolled W. As shown in FIG.
The rolling device 1 is, for example, a device that rolls a relatively small material W to be rolled at a predetermined temperature, and is a small rolling device for a rolling test (for a rolling experiment).

Specifically, the rolling device 1 is a reversible rolling device that gradually rolls the material to be rolled W until it reaches a target plate thickness by passing the material W to be forwarded in the forward direction and the reverse direction a plurality of times. The rolling device 1 includes a pair of upper and lower work rolls (rolling rolls) 2, 2, a support mechanism 3, and a moving mechanism 4.
The work roll 2 can be changed in its reduction position by a reduction position control device (not shown), and its gap amount is variable. The work rolls 2 and 2 are made of a current-carrying material such as metal.

  The support mechanism 3 is composed of a chuck device that holds both ends of the material to be rolled W in the rolling direction. The chuck device 3 includes a first grip portion 3A that grips one end portion of the material to be rolled W, and a second grip portion 3B that grips the other end portion of the material to be rolled W. The first grip portion 3A and the second grip portion 3B are provided with energizing electrodes 6A and 6B, respectively. In a state where the material to be rolled W is gripped by the first gripping portion 3A and the second gripping portion 3B, the energizing electrodes 6A and 6B and the material to be rolled W are in contact with each other. Note that the first gripping part 3A and the second gripping part 3B are electrically insulated from the energizing electrodes 6A and 6B.

  The moving mechanism 4 moves the chuck device (support mechanism) 3 in the forward direction or the reverse direction, and can apply tension to the material W to be rolled by moving the chuck device 3 in the rolling direction. is there. For example, the moving mechanism 4 is composed of, for example, a hydraulic cylinder that is connected to the chuck device 3 and moves the chuck device 3 by expanding and contracting. The moving mechanism 4 is not limited to a hydraulic cylinder, and may be provided in a coil unwinding device or a winding device to move the chuck device 3 or may be another device such as a linear actuator. Also good.

As described above, according to the rolling device 1, a chuck having the first gripping part 3 </ b> A and the second gripping part 3 </ b> B at both ends in the rolling direction of the material W to be rolled, and having the first gripping part 3 </ b> A and the second gripping part 3 </ b> B. The workpiece 3 can be rolled by moving the device 3 in the forward direction or the reverse direction by the moving mechanism 4.
Such a rolling device 1 includes a measuring device 9 for measuring the temperature of the material to be rolled W and a heating means 10 for heating the material to be rolled W. The measuring device 9 is composed of, for example, a radiation thermometer, a thermocouple, or the like, and the measured temperature is input to the heating means 10.

The heating means 10 heats the material to be rolled W gripped by the chuck device 3 by applying a current, and includes a power supply unit 11 for supplying a direct current and a control unit 12 for controlling the power supply unit 11. Yes. The power supply unit 11 is connected to the energizing electrodes 6 </ b> A and 6 </ b> B, and the control unit 12 controls the power supply unit 11 based on the temperature measured by the measuring device 9.
2A to 2C are diagrams showing a flow of rolling the material W to be rolled while being rolled by the rolling device 1. The rolling method of the material W to be rolled, the heating means 10 (power supply unit 11, control unit 12), and the like will be described with reference to FIGS. 2A to 2C.

  As shown in FIG. 2A, when rolling the material to be rolled W, first, both ends in the rolling direction of the material to be rolled W are gripped by the first gripping portion 3A and the second gripping portion 3B. In addition, after gripping the material to be rolled W, in a state where the work rolls 2 and 2 are not in contact with the material to be rolled W (non-contact state), the control unit 12 turns on the power supply unit 11 and turns on the energizing electrodes 6A and 6B. Apply direct current. That is, a direct current is applied between the gripping parts (between the first gripping part 3A and the second gripping part 3B), and the material W to be rolled up to a predetermined temperature by Joule heat generated by the application of the direct current. Heat. For example, the material to be rolled W is heated from a cold state where the contact resistance is low, and the heating is continued until the material W to be rolled reaches a high temperature (for example, 1200 ° C.) (current application is continued).

During the energization heating, it is desirable to apply tension to the material W to be rolled by moving the first gripping part 3A and the second gripping part 3B away from each other by the moving mechanism 4. Thereby, the leakage which occurs because the to-be-rolled material W bends and contacts the work rolls 2 and 2 etc. can be prevented.
When the material to be rolled W is heated to a predetermined temperature, that is, when the temperature measured by the measuring device 9 reaches a predetermined temperature, the control unit 12 turns off the power supply unit 11 to direct current to the energizing electrodes 6A and 6B. Stop applying current.

  Next, as shown in FIG. 2B, the gap between the work rolls 2 and 2 is reduced to bring the work rolls 2 and 2 into contact with the material to be rolled W (contact state). The workpiece W is rolled by moving the chuck device 3 in the forward direction or the reverse direction by the moving mechanism 4. That is, reversible rolling is continuously performed by moving the material to be rolled W while switching the material to be rolled in the forward direction or the reverse direction while the material to be rolled W is chucked by the chuck device 3. During rolling, since tension is applied to the material to be rolled W by the chuck device 3, tension can be applied as rolling tension to the material to be rolled W, and the rolling load can be reduced. Moreover, since it rolls, hold | grip the to-be-rolled material W with the chuck | zipper apparatus 3, when the temperature of the to-be-rolled material W falls, temperature can be raised immediately.

  Specifically, as shown in FIG. 2C, when the temperature of the material to be rolled W is lower than a predetermined value during rolling, first, the work rolls 2, 2 are increased by increasing the roll gap amount of the work rolls 2, 2. The material to be rolled W is brought into a non-contact state. And after making the work rolls 2 and 2 and the to-be-rolled material W into a non-contact state, the power supply part 11 is turned ON again by instruction | command of the control part 12 grade | etc., And direct current is applied to energizing electrode 6A, 6B, The material W is heated to a predetermined temperature. After the material to be rolled W is heated, the material to be rolled W can be rolled by reducing the roll gap amount of the work rolls 2 and 2 after turning off the power source 11 again as described above.

  As mentioned above, according to the rolling apparatus 1, it can roll with the work rolls 2 and 2 in the state which made the to-be-rolled material W the predetermined temperature. Further, when the temperature of the material to be rolled W decreases during rolling, the temperature of the material to be rolled W can be quickly raised. Therefore, for example, the test piece (rolled material W) can be rolled at a predetermined temperature and with a predetermined reduction load, and after the test piece is rolled, the relationship between the rolling conditions and the metal structure after the rolling is grasped. Or the metal composition can be adjusted by rolling conditions.

  In the above-described embodiment, the work rolls 2 and 2 are made of a current-carrying material. Instead, the work rolls 2 and 2 are made of an insulating material such as ceramic, that is, an insulating film such as a ceramic roll or ceramic. You may comprise a coated roll. In such a case, an electric current can be applied to the material to be rolled W even when the work rolls 2 and 2 and the material to be rolled W are kept in contact with each other. For example, at the start of rolling, the temperature of the material to be rolled W is raised, and at this time, the work rolls 2 and 2 and the material to be rolled W are applied in a contact state, not in a non-contact state. When the temperature of the material to be rolled W reaches a predetermined temperature, the power supply unit 11 is turned off and the chuck device 3 is moved forward or backward by the moving mechanism 4 to roll the material to be rolled W. When the temperature of the material to be rolled W becomes equal to or lower than a predetermined value during rolling of the material to be rolled W, the power supply unit 11 is turned on again and energized while the work rolls 2 and 2 and the material to be rolled W remain in contact with each other. A direct current is applied to the electrodes 6A and 6B to heat the material to be rolled W to a predetermined temperature. According to this, in order to apply a direct current to the material W to be rolled, it is not necessary to separate the work rolls 2 and 2 from the material W to be rolled, and the rolling time can be shortened. When the work rolls 2 and 2 are constituted by ceramic rolls or ceramic coating rolls, rolling may be performed while applying a direct current to the material to be rolled W.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.

  In the above-described embodiment, the control unit 12 performs ON / OFF switching control of the power source 11. Instead, the temperature measured by the measuring device 9 is displayed on a monitor or the like, and the power source 11 is turned ON / OFF. The presence or absence of heating may be manually switched by providing a manual switch to perform.

1 Rolling device 2 Work roll (rolling roll)
DESCRIPTION OF SYMBOLS 3 Support mechanism 3A 1st holding part 3B 2nd holding part 4 Movement mechanism 6A Current supply electrode 6B Current supply electrode 9 Measuring apparatus 10 Heating means 11 Power supply part 12 Control part

Claims (6)

A rolling roll for rolling the material to be rolled, and a support mechanism for gripping both ends of the material to be rolled in the rolling direction is a direction passing the material to be rolled in the rolling roll, moving the support mechanism in the rolling direction And a moving mechanism for applying tension to the material to be rolled,
It comprises heating means for applying an electric current to the material to be rolled held by the support mechanism and heating it,
The said support mechanism is provided with the holding part which hold | grips the both ends of a to-be-rolled material, respectively, The said heating means applies an electric current between the said holding parts, The rolling apparatus characterized by the above-mentioned . Wherein with measurable measuring device the temperature of the rolled material, the heating means, the measurement based on the measured temperature in the apparatus, the rolling device according to claim 1, characterized in that controlling the current to be applied . 3. The rolling apparatus according to claim 1, wherein when a current is applied to the material to be rolled, the rolling roll and the material to be rolled are in a non-contact state. When the temperature of the material to be rolled becomes a predetermined value or less during rolling of the material to be rolled, after increasing the roll gap amount of the rolling roll and bringing the rolling roll and the material to be rolled into a non-contact state, The rolling apparatus according to claim 3 , wherein a current is applied to the material to be rolled by the heating unit. The rolling roll is a ceramic roll or a roll whose surface is coated with ceramic,
3. The rolling apparatus according to claim 1, wherein when a current is applied to the material to be rolled, the rolling roll and the material to be rolled are brought into contact with each other. When the temperature of the material to be rolled becomes equal to or lower than a predetermined value during rolling of the material to be rolled, an electric current is applied to the material to be rolled by the heating means while keeping the rolling roll and the material to be rolled in contact with each other. The rolling apparatus according to claim 5 .

Images