JPS6316955A - Sheet polishing method - Google Patents

Abstract

PURPOSE:To enable a long sheet to be always uniformly polished when the sheet like clad steel sheet is polished by polishing the long sheet with a grinding wheel to maintain always constant the contact condition between the grinding wheel and the sheet. CONSTITUTION:A sheet 16 travelling while supported by carrier rolls 10,12 is continuously polished by a grinding wheel 14 rotatably driven by a motor. Since the carrier rolls 10,12 are always pressed to the grinding wheel 14 side by a certain force, the surface pressure on the contact portion of the grinding wheel 14 and sheet 16 is maintained constant even if the tension of travelling sheet 16 varies. When the grinding wheel 14 is worn, the diameter of grinding wheel 14 is measured by a sensor 26 so that the rotational speed of the motor for rotatably driving the grinding wheel is increased by the reduction of diameter of grinding wheel 14 and the relative speed of grinding wheel 14 in the contact portion with sheet 16 is maintained always constant. Also, the axis of grinding wheel 14 is moved to the carrier rolls 10, 12 side according to the variation of diameter of grinding wheel 14 so that the grinding wheel always contacts the sheet 16 in the same position.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a method for polishing a thin plate.

(b) Prior Art When manufacturing clad steel sheets, it is necessary to polish the joint surfaces of the materials to clean and activate the surfaces. For this reason, belt sanders have conventionally been used. That is,
Surface polishing is performed by rotating an endless belt whose surface is coated with an abrasive material and bringing it into contact with the surface of the thin plate.

(c) Problems to be Solved by the Invention However, with the conventional belt polishing machine as described above, when attempting to continuously polish a long steel plate, the amount of polishing gradually decreases due to consumption of the abrasive material in the belt. come. For this reason, it is necessary to replace the belt midway through the process, but there is a problem in that the amount of polishing changes significantly before and after replacing the belt, making it impossible to uniformly polish the steel plate. The present invention aims to solve these problems.

(d) Means for Solving the Problems The present invention solves the above problems by using a grinding wheel to polish a thin plate and keeping the contact state between the grinding wheel and the thin plate constant during polishing. That is, the method for polishing a thin plate according to the present invention involves bringing one side of the thin plate into contact with two receiving rolls and bringing the other side of the thin plate into contact with a wheel placed between the two receiving rolls. A constant pressing force is always applied to the receiving roll in the direction of the grinding wheel, and the diameter of the grinding wheel is constantly detected during polishing. The rotational speed of the electric motor for driving the wheel rotation is gradually increased so that the rotational speed of the wheel rotation is kept constant, and the rotational speed of the wheel rotation drive motor is increased gradually as the diameter of the wheel decreases so that the contact position between the wheel and the thin plate during polishing is constant. The gist is to gradually move the heart in the direction of bringing it closer to the receiving roll.

(E) A thin plate running while being supported by a receiving roll,
Continuous polishing is performed using a wheel that is rotated by an electric motor. Since the receiving roll is always pressed against the grinding wheel with a constant force, even if the tension of the running thin plate fluctuates due to various factors, the blood pressure at the contact area between the grinding wheel and the thin plate remains constant. be done. As the polishing of the thin plate progresses, the grinding wheel gradually wears out and the diameter of the grinding wheel becomes smaller. When the diameter of the wheel decreases, problems arise in that the speed of the outer circumference of the wheel decreases and the contact position between the wheel and the thin plate changes. However, in the method of the present invention, even if the grinding wheel is worn out, the polishing conditions are controlled in the following manner so that they do not change. In other words, the diameter of the grinding wheel is measured by a sensor during polishing, and the rotational speed of the motor that drives the grinding wheel is increased by the decrease in the diameter of the grinding wheel, so that the relative speed at the point of contact with the thin plate of the grinding wheel is always kept constant. It is said that In addition, the axis of the grinder is moved toward the receiving roll according to changes in the diameter of the grinder, so that it always contacts the thin plate at the same position. As a result, the blood pressure at the contact portion of the wheel, the speed of the contact portion of the wheel, and the position of the contact portion of the wheel are always kept constant, and uniform polishing can be performed in the longitudinal direction of the thin plate.

(F) Embodiment Figures 1 and 2 show an embodiment of the present invention. A long thin plate 16 runs from right to left in the figure between two receiving rolls 10 and 12 arranged in parallel at a predetermined interval and a grinding wheel 14.

The receiving rolls 10 and 12 are in contact with the upper surface of the thin plate 16, and the grinder 14 is in contact with the upper surface of the thin plate 16. The grinding wheel 14 is arranged at an intermediate portion between the receiving roll 10 and the receiving roll 12. Although the axial center of the receiving roll 12 is fixed at a fixed position, the axial center of the receiving roll 10 is always pressed upward by a constant force by the fluid pressure cylinder 18.

The axis of the grinding wheel 14 can be adjusted in position in the upper F direction by an electric motor 19 and a ball screw 20. The grinding wheel 14 is rotationally driven by an electric motor 22. The operation of electric motor 19 and electric motor 22 is controlled by signals from control device 24 . The control device 24 receives signals from the sensor 26 manually.

The sensor 26 is capable of measuring changes in the outer diameter of the grinding wheel 14, and uses, for example, a sensor that shines a laser beam on the grinding wheel 14 and detects the change in diameter based on the reflected light. A dresser 28 for dressing the grinding wheel 14 is provided below the grinding wheel 14.

Next, the operation of this embodiment will be explained. The thin plate 16 moves to the left in FIGS. 1 and 2 at a constant speed while being pressed against the grinding wheel 14 by the receiving rolls 10 and 12. In this state, the electric motor 22 rotates the grinding wheel 14 at a predetermined rotational speed. As a result, the thin plate 16 is polished. During polishing, the hydraulic cylinder 18
Since the receiving roll 10 presses the thin plate 16 against the grinding wheel 14 with a constant force obtained by
Even if the tension of the grinder 14 and the thin plate 16 fluctuates,
The contact pressure between the two is kept constant. Although the grinding wheel 14 wears out as the polishing progresses, changes in the diameter of the grinding wheel 14 are constantly detected by the sensor 26. The control device 24 controls the operation of the electric motor 19 and the electric motor 22 in accordance with the change in the diameter of the wheel 14 detected by the sensor 26.

That is, the rotational speed of the electric motor 22 is increased in accordance with the decrease in the diameter of the grindstone 14. The rate of increase in the rotational speed of the electric motor 22 corresponds to the rate of decrease in the diameter of the grinding wheel 14. Therefore, the speed of the outer periphery of the grinding wheel 14, that is, the speed of the contact portion with the thin plate 16, remains constant regardless of the decrease in the diameter of the grinding wheel 14. Further, the control device 24 operates the electric motor 19 according to the decrease in the diameter of the grinding wheel 14 to move the axis of the grinding wheel 14 toward the receiving rolls 10 and 12. Grinding wheel 14
The amount of movement of the axis of the grinding wheel 14 is set to be equal to the amount of decrease in the radius of the grinding wheel 14. Due to the stiffness, the position of the contact portion between the grinding wheel 14 and the thin plate 16 is always constant. This ultimately results in
The blood pressure at the contact portion between the grinding wheel 14 and the thin plate 16, the relative speed of the contact portion, and the contact position are always maintained constant. According to the polishing conditions, from the time of the start of polishing, the long thin plate 1
The thin plate 16 is held constant until the end of polishing in step 6.
The amount of polishing is uniform over the entire length.

In this embodiment, the electric motor 19 and the ball screw 2o are used to change the axis of the grinding wheel 14, but these may be replaced with a fluid pressure cylinder. In addition to the non-contact type sensor 26 mentioned above, the sensor 26 may also be a contact type sensor that detects changes in the diameter of the grinding wheel 14 by bringing a contact roll into contact with the outer periphery of the grinding wheel 14 and detecting changes in the diameter of the grinding wheel 14 from changes in the position of the contact roll axis. It is also possible to use the formula.

(g) Effects of the Invention - As explained above, according to the present invention, a long thin plate is polished with a grinder, and the contact state between the grinder and the thin plate is always constant. , polishing can always be performed under constant processing conditions, making it possible to uniformly polish a long thin plate.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus for carrying out the method of the present invention, and FIG. 2 is a plan view of the apparatus shown in FIG. 10.12...Receiving roll, 14...Wheel, 16
...Thin plate, 18...Fluid pressure cylinder, 19...Electric motor, 20...Ball screw, 22...Electric motor, 24
...control device, 26...sensor.

Claims (1)

[Claims] In a thin plate polishing method in which the surface of a long thin plate is polished while continuously traveling, one surface of the thin plate is brought into contact with two receiving rolls, and the thin plate is placed between the two receiving rolls. The thin plate is run with the other side of the plate in contact with the grinding wheel, a constant pressing force is always applied to the receiving roll in the direction of the grinding wheel, and the diameter of the grinding wheel is constantly detected during polishing. The rotational speed of the electric motor for rotating the grinding wheel is gradually increased so that the speed of the outer circumference of the grinding wheel remains constant regardless of the decrease in diameter due to wear of the grinding wheel, and the contact position between the grinding wheel and the thin plate during polishing is kept constant. A thin plate polishing method characterized in that the axis of the wheel is gradually moved in a direction toward the receiving roll as the diameter of the wheel decreases so that the diameter of the wheel decreases.