Steel plate grinding device and grinding method

Abstract

To avoid a collision between a pressing roll and an end of sheet steel, without leaving an unground part on a surface side from the end of the sheet steel or being associated with the stop of traveling at the end of the sheet steel, in a travel-type sheet steel polishing apparatus.SOLUTION: In a travel-type sheet steel polishing apparatus that applies a pressing force to an abrasive belt 4 via a pressing roll 5 by a hydraulic cylinder 2, guide means 8 with a tapered surface 8T along an end of sheet steel 6 is provided on front and rear sides in a traveling direction of the pressing roll 5. Additionally, piping of the hydraulic cylinder 2 is provided with a relief valve 9 for releasing pressure equal to or higher than set pressure.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a polishing apparatus that travels on and polishes the surface of a steel plate, and a polishing method using the same.

Background Art

[0002] In the manufacturing process of steel products, as a means for cleaning the surface of a steel plate, that is, removing the scale on the surface of the steel plate or polishing the surface defects of the steel plate, a technique of pressing a polishing belt containing abrasive grains against the surface of the steel plate with a pressing roll for polishing is performed. To improve the efficiency of this operation, traveling steel plate polishing apparatuses are also widely applied (see, for example, Patent Document 1).

[0003] However, in conventional apparatuses, when trying to avoid the collision between the pressing roll and the end of the steel plate, re-polishing of the remaining shaving generated from the end of the steel plate to the surface side or stopping the travel at the end of the steel plate is required, resulting in a problem that the polishing efficiency is inhibited. Here, the end of the steel plate refers to the linear portion where the surface and the end face of the steel plate intersect.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, an object of the present invention is to solve the above problems and provide a steel plate polishing apparatus and a steel plate polishing method that avoid the collision between the pressing roll and the end of the steel plate without leaving shaving from the end of the steel plate to the surface side or stopping the travel at the end of the steel plate.

Means for Solving the Problems

[0006] To solve the above problems, the inventors conducted investigations using a steel plate polishing apparatus as shown in Fig. 4. This apparatus is a traveling steel plate polishing apparatus that applies a pressing force to a polishing belt 4 by a pressing roll 5.

[0007] As a mechanism for traveling with the polishing belt 4 pressed against the surface of the steel plate 6 with the above pressing force, the steel plate polishing apparatus in Fig. 4 includes a traveling member 20, a tilting member 22, traveling support driving means (not shown), an idler roll 3, polishing belt driving means 1, a hydraulic cylinder 2, and a hydraulic mechanism 7.

[0008] The upper end of the traveling member 20 is supported by traveling support driving means (not shown) and moves in the traveling direction (left - right direction of the paper surface) and the direction orthogonal to the traveling direction (depth direction of the paper surface). The lower end of the traveling member 20 is provided with a rotatable pivot portion 24 for fixing the tilting member 22, and the tilting member 22 is tiltable around the pivot portion 24.

[0009] One end of the tilting member 22 rotatably supports the pressing roll 5, and since the polishing belt 4 is endless and needs to be held in a tensioned state, it is provided with an idler roll 3 that wraps the endless polishing belt 4 together with the pressing roll 5. The idler roll 3 is connected to the pressing roll 5 by a connecting member 26 fixed to the tilting member 22, and the distance from the pressing roll 5 is adjustable.

[0010] The polishing belt driving means 1 includes a motor 15 supported at the other end of the tilting member 22, a pulley 16 driven to rotate by the motor 15, and a rotation transmission belt 17 that transmits the rotation of the pulley 16 to the roll shaft 5A of the pressing roll 5.

[0011] One end side of the hydraulic cylinder 2 in the rod advancing - retreating direction is fixed to a rotatable pivot portion 30 disposed on the traveling member 20, and the other end side is fixed to a rotatable pivot portion 32 disposed on the tilting member 22.

[0012] In this example, the pivot point 30 is disposed above the pivot point 24, and the pivot point 32 is disposed between the pivot point 24 and the pulley 16. Therefore, when the tilting member 22 tilts clockwise, a pressing force is generated on the pressing roll 5, causing the abrasive belt 4 to press against the surface of the steel plate 6, and when the tilting member 22 tilts counterclockwise, a force opposite to the pressing force is generated on the pressing roll 5, causing the abrasive belt 4 to detach from the surface of the steel plate 6.

[0013] The hydraulic mechanism 7 adjusts the amount of oil supplied to the rod side and anti-rod side separated by the piston of the hydraulic cylinder 2, and applies pressure to both sides in a reciprocal manner. In this example, when the rod side is pressurized, the distance between the pivot points 30 and 32 is shortened, the tilting member 22 tilts clockwise, and the abrasive belt 4 is pressed against the surface of the steel plate 6. On the other hand, when the anti-rod side is pressurized, the distance between the pivot points 30 and 32 is widened, the tilting member 22 tilts counterclockwise, and the abrasive belt 4 is released from the surface of the steel plate 6. Hereinafter, the rod side will be referred to as the pressurized side, and the anti-rod side will be referred to as the release side. In addition, the state in which the pressurized side of the hydraulic cylinder 2 is pressurized will be referred to as the pressurized state, and the state in which the release side of the hydraulic cylinder 2 is pressurized will be referred to as the release state.

[0014] Here, "P" in the hydraulic mechanism 7 is an abbreviation for pump, meaning that it is the pressurized line by the pump, and "T" is an abbreviation for tank, meaning that it is the return line to the tank (the same applies to Figures 1, 2, 5 and 6).

[0015] When a spring (not shown) is used instead of the hydraulic cylinder 2, the spring constant is set so that a predetermined pressing force is applied to the pressing roll 5 during the polishing operation.

[0016] At the start of the work of polishing the entire surface of a steel plate using the steel plate polishing device of Figure 4, the polishing belt 4 was rotated in a pressed state and traveled from the outside of the steel plate 6, scraping off part of the edge face of the steel plate 6 and passing from the edge to the surface side of the steel plate 6.

[0017] Note that the traveling direction is usually the longitudinal direction of the steel plate. Since the width of the polishing belt 4 is usually narrower than the width of the steel plate, a method is adopted in which the steel plate is divided into a plurality of regions in the width direction and adjacent regions are polished sequentially (see, for example, FIGS. 5(c) and 6(c)). At this time, between the end of polishing of a certain region and the start of polishing of the adjacent region, the steel plate polishing apparatus is laterally moved to the adjacent region side, and polishing is performed with the traveling direction reversed.

[0018] However, there was a case where the pressing roll 5 approaching the end of the steel plate accidentally protruded into a region lower than the surface of the steel plate and collided with the end of the steel plate before reaching the surface side from the end of the steel plate, leading to a breakage accident of the polishing belt 4.

[0019] Therefore, in order to avoid the collision between the pressing roll 5 and the end of the steel plate, one method is to press the polishing belt 4 after passing above the end of the steel plate. In this method, as shown in FIG. 5, while rotating the polishing belt 4 in a detached state, it is run from in front of the end of the steel plate 6 to approach the end of the steel plate 6 (see FIG. 5(a)), and the polishing belt 4 is pressed after passing from the end of the steel plate 6 to the surface side (see FIG. 5(b)). In this case, it is difficult to match the start time of pressing and the passing time of the end of the steel plate 6, and a time delay occurs from the passing of the end of the steel plate to the start of pressing, resulting in shaving remaining from the end of the steel plate on the surface side from the polishing start side (about 50 to 200 mm in the traveling direction length) (see FIG. 5(c)). Therefore, an additional polishing process by manual work is required, and the polishing efficiency is reduced. In FIG. 5(c), 4B is the contact portion between the polishing belt 4 and the steel plate 6 during operation (the same applies to FIG. 6(c)).

[0020] Another method is to stop the running at the end of the steel plate, press the polishing belt 4 against the surface of the end of the steel plate, and then resume running for polishing. In this method, as shown in Fig. 6, with the polishing belt 4 in a disengaged state, it is run from in front of the end of the steel plate 6 while rotating the polishing belt 4 to approach the end of the steel plate 6 (see Fig. 5(a)), stop running directly above the end of the steel plate 6 and press it (see Fig. 6(b)), and then resume running. In this case, it is necessary to always stop the running at the end of the steel plate on the polishing start side (see Fig. 6(c)), and accordingly, the polishing efficiency is reduced. Also, due to the pressing in the stopped state, the polished surface may become uneven.

[0021] Therefore, the inventors of the present invention have intensively studied to solve the above problems. As a result, they obtained the finding that it is effective to provide guiding means before and after the pressing roll. Thereby, even when the pressing roll passes through the end of the steel plate while running from the outside of the steel plate while rotating the polishing belt, it is possible to prevent a collision with the end of the steel plate. The present invention has been further studied based on this finding, and the gist thereof is as follows. [1] In a traveling type steel plate polishing apparatus that applies a pressing force to a polishing belt by a pressing roll, a steel plate polishing apparatus characterized by comprising guiding means in front of and behind the pressing roll in the traveling direction. [2] The steel plate polishing apparatus according to [1] above, wherein the guiding means has a tapered surface that follows the end of the steel plate. [3] The steel plate polishing apparatus according to [1] or [2] above, characterized by comprising a hydraulic cylinder that applies the pressing force to the pressing roll. [4] The steel plate polishing apparatus according to [3] above, characterized by comprising a relief valve that releases a pressure equal to or higher than a set pressure in the piping of the hydraulic cylinder. [5] The steel plate polishing apparatus according to any one of [1] to [4] above, characterized by satisfying at least one of the following: the pressing force: 0.5 to 2.0 kN, the roll diameter of the pressing roll: φ250 to 350 mm, the roll rotation speed of the pressing roll: 1000 to 2000 rpm, and the traveling speed related to the traveling: 10 to 20 m / min. [6] Using the steel plate grinding apparatus according to any one of [3] to [5] above, start the running from a position lower than the surface to be ground of the steel plate under the application of the pressing force before the start of the grinding, and raise the pressing roll to the surface to be ground along the tapered surface of the guiding means at the end of the steel plate. A steel plate grinding method characterized by this. [7] When the pressing roll rises by running along the tapered surface of the guiding means at the end of the steel plate, the steel plate grinding method according to [6] above, characterized in that the pressing force is adjusted. [8] The pressing force: 0.5 to 2.0 kN, the roll diameter of the pressing roll: φ250 to 350 mm, the roll rotation speed of the pressing roll: 1000 to 2000 rpm, and the running speed related to the running: at least one of 10 to 20 m / min. The steel plate grinding method according to [6] or [7] above, characterized by satisfying this.

Effect of the Invention

[0022] According to the present invention, by providing guiding means in front of and behind the pressing roll in the running direction, it is possible to avoid the collision between the pressing roll running from outside the steel plate and passing through the surface of the steel plate end and the end of the steel plate. Therefore, it has an excellent effect that the remaining shaving on the surface side from the end of the steel plate and the running stop at the end of the steel plate are eliminated, and the grinding efficiency is improved.

Brief Explanation of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments of the present invention will be described with examples. FIG. 1 shows an example of the device of the present invention. As in this example, the device of the present invention is a traveling steel plate grinding device that applies a pressing force to the polishing belt 4 by the pressing roll 5, and is provided with guiding means 8 in front of and behind the pressing roll 5 in the traveling direction ( [1] of the present invention). Here, in front of and behind the pressing roll 5 in the traveling direction, the traveling direction is bidirectional, forward and reverse. In the case of the forward direction, the positive side is the front and the reverse side is the rear. In the case of the reverse direction, the reverse side is the front and the positive side is the rear.

[0025] It is preferable that the separation distances of the guiding means 8 in the front and the rear from the polishing belt 4 are 5 to 50 mm. If this separation distance is less than 5 mm, unnecessary contact between the guiding means 8 and the polishing belt 4 may occur. Also, if it exceeds 50 mm, since the lower end of the guiding means 8 continues to contact the steel plate until it contacts the polishing belt 4 after contacting the lower end of the guiding means 8, unnecessary scratches on the steel plate and wear of the lower end of the guiding means 8 may occur. More preferably, this separation distance is 10 to 20 mm. As the material of the guiding means 8, steel is preferable in terms of strength and cost.

[0026] In the example of FIG. 1, the guiding means 8 and the relief valve 9 are newly installed in the steel plate grinding device of FIG. 4, and the other configurations are the same as those in FIG. 4. The same reference numerals are given to the same or corresponding members as in FIG. 4, and the description is omitted.

[0027] The operation of the guiding means 8 is as follows. First, when the pressing roll 5 travels from the outside of the steel plate 6, for example, in the left direction in the crimped state and approaches the end portion (C portion) of the steel plate 6 (Fig. 2(a)), the left guiding means 8 collides with the end portion of the steel plate 6 (Fig. 2(b)). Then, the collided left guiding means 8 rises along the end portion of the steel plate 6 (Fig. 3(a)) and guides the lowest point of the pressing roll 5 to the height position of the surface to be polished (Fig. 3(b)).

[0028] As a result, the pressing roll 5 does not collide with the end portion of the steel plate 6, and the polishing belt 4 can smoothly contact the surface side from the end portion of the steel plate 6 and travel as it is to perform polishing. Therefore, the problem that the polishing efficiency is inhibited due to the remaining shaving on the surface side from the end portion of the steel plate 6 and the running stop at the end portion of the steel plate 6 is solved, and the polishing efficiency is improved.

[0029] As a mechanism for making the pressing roll 5 follow the rise of the guiding means 8, for example, fixing the guiding means 8 to the tilting member 22 can be mentioned (Fig. 1).

[0030] In order for the guiding means 8 to smoothly rise along the end portion of the steel plate 6 after colliding with the end portion of the steel plate 6, it preferably has a tapered surface 8T (Figs. 1 to 3) along the end portion of the steel plate 6 ([2] of the present invention). The tapered surface 8T is preferably a flat surface, but may also be a curved surface or a surface having irregularities.

[0031] Further, after the guiding means 8 passes through the end portion of the steel plate, in order for the polishing belt 4 to smoothly contact the surface side from the end portion of the steel plate 6, the lower end point of the guiding means 8 is set at a position higher than the lowest point of the pressing roll 5 in the polishing operation state (Fig. 1). And the height direction distance between the lower end point and the lowest point is preferably 5 to 20 mm. If this height direction distance is less than 5 mm, when the pressing roll 5 sinks in the vertical direction due to the surface irregularities of the steel plate to be polished, the guiding means 8 may contact the steel plate. Also, if it exceeds 20 mm, when colliding with the end portion of the steel plate, the radial component of the collision component force increases, and the belt may break. More preferably, this height direction distance is 10 to 15 mm.

[0032] In the device of the present invention, the means for applying the pressing force to the pressing roll 5 may be either a spring (not shown) or a hydraulic cylinder 2 (FIG. 1). However, from the viewpoint of controllability of the pressing force, a hydraulic cylinder is preferable ([3] of the present invention).

[0033] Furthermore, it is preferable to provide a relief valve 9 (FIG. 1) that releases a pressure equal to or higher than the set pressure in the piping of the hydraulic cylinder 2 ([4] of the present invention). The relief valve 9 is installed in the piping connected to the crimping side (rod side) of the hydraulic cylinder 2 (FIG. 1). The operation is as follows. As shown in FIG. 2(b), when the pressing roll 5 rises following the guiding means 8 that rises along the end portion (C portion) of the steel plate 6, the tilting member 22 tilts counterclockwise and the crimping side is pressurized from the state of the set pressure, but the pressurized portion is released by the relief valve 9. Therefore, it is possible to avoid damage to the piping or the like due to an unnecessary pressure increase, and it is possible to keep the pressing force applied to the pressing roll 5 constant.

[0034] In the device of the present invention, the part common to the steel plate polishing device preferably follows the performance range of the steel plate polishing device and satisfies at least one of the following (a) to (e) ([5] of the present invention). (a) Pressing force: 0.5 to 2.0 kN, (b) Roll diameter of the pressing roll: φ250 to 350 mm, (c) Roll rotation speed of the pressing roll: 1000 to 2000 rpm, and (d) Travel speed related to the travel: 10 to 20 m / min.

[0035] A preferable polishing method for avoiding the collision between the pressing roll 5 and the end face of the steel plate using the device of the present invention is as follows. That is, before the start of polishing, start traveling from a position lower than the surface to be polished under the application of the pressing force (under the crimping state), and raise the pressing roll 5 to the surface to be polished along the tapered surface 8T of the guiding means 8 at the end of the steel plate (see FIGS. 2 and 3, [6] of the present invention).

[0036] At this time, in order to avoid an unnecessary increase in the pressing force while the pressing roll 5 rises to the surface to be polished, it is preferable to adjust the pressing force ([7] of the present invention). The relief valve 9 can be used for this adjustment.

[0037] Furthermore, in the polishing method using the apparatus of the present invention, the parts common to the case where the steel plate polishing apparatus is used should follow the performance range of the apparatus of Figure 4, and it is preferable that at least one of (a) to (d) above be satisfied ([8] of the present invention).

[0038] The present invention is also applicable to polishing processes in which the polishing target is a metal plate other than a steel plate (e.g., a copper plate, a nickel plate, a titanium plate, etc.) and smooth contact between the edge surface of the plate to be polished and the polishing belt is required. The present invention is also applicable to polishing processes in which the polishing means is something other than a polishing belt and smooth contact between the edge surface of the plate to be polished and the polishing means is required. [Explanation of symbols]

[0039] 1. Abrasive belt drive means 2 hydraulic cylinders 3 Idol Roll 4 Abrasive Belts 4B Contact area between abrasive belt and steel plate 5 Pressing roll 5A Pressing roll shaft 6 steel plate 7 Hydraulic mechanism 8 Guidance means 8T tapered surface 9 Relief valve 15 motor 16 pulleys 17 Rotation transmission belt 20 Running member 22 Tilting member 24, 30, 32 Rotating fulcrum 26 Connecting member

Claims

1. In a traveling steel plate polishing apparatus that applies a pressing force to a polishing belt by a pressing roll, guide means having a tapered surface that follows the edge of the steel plate is provided on the front and rear in the traveling direction of the pressing roll, on the side opposite to the pressing roll with respect to the polishing belt, with a separation distance from the polishing belt of 5 to 50 mm, and the lower end point of the guide means being higher than the lowest point of the pressing roll, and the height direction distance between the lower end point of the guide means and the lowest point of the pressing roll being 5 to 20 mm, The steel plate polishing apparatus, wherein the tapered surface is shaped to face the lowest point of the pressing roll as it approaches the pressing roll.

2. The steel plate polishing apparatus according to claim 1, further comprising a hydraulic cylinder that applies the pressing force to the pressing roll.

3. The steel plate polishing apparatus according to claim 2, further comprising a relief valve that releases a pressure equal to or higher than a set pressure in a pipe of the hydraulic cylinder.

4. The steel plate polishing apparatus according to claim 2, wherein at least one of the following conditions is satisfied: the pressing force is 0.5 to 2.0 kN, the roll diameter of the pressing roll is φ250 to 350 mm, the roll rotation speed of the pressing roll is 1000 to 2000 rpm, and the traveling speed related to the traveling is 10 to 20 m / min.

5. The steel plate polishing apparatus according to claim 3, wherein at least one of the following conditions is satisfied: the pressing force is 0.5 to 2.0 kN, the roll diameter of the pressing roll is φ250 to 350 mm, the roll rotation speed of the pressing roll is 1000 to 2000 rpm, and the traveling speed related to the traveling is 10 to 20 m / min.

6. A steel plate polishing method, using the steel plate polishing apparatus according to claim 2, starting the traveling from a position lower than the surface to be polished of the steel plate under the application of the pressing force before the start of the polishing, and raising the pressing roll to the surface to be polished along the tapered surface of the guide means at the edge of the steel plate.

7. A steel plate polishing method, using the steel plate polishing apparatus according to claim 3, starting the traveling from a position lower than the surface to be polished of the steel plate under the application of the pressing force before the start of the polishing, and raising the pressing roll to the surface to be polished along the tapered surface of the guide means at the edge of the steel plate.

8. The steel plate polishing method according to claim 6, characterized in that when the pressing roll rises by causing the end portion of the steel plate to follow the tapered surface of the guiding means, the pressing force is adjusted.

9. The steel plate polishing method according to claim 7, characterized in that when the pressing roll rises by causing the end portion of the steel plate to follow the tapered surface of the guiding means, the pressing force is adjusted.

10. The steel plate polishing method according to claim 6, characterized by satisfying at least one of the following: the pressing force: 0.5 to 2.0 kN, the roll diameter of the pressing roll: φ250 to 350 mm, the roll rotation speed of the pressing roll: 1000 to 2000 rpm, and the traveling speed related to the traveling: 10 to 20 m / min.

11. The steel plate polishing method according to claim 7, characterized by satisfying at least one of the following: the pressing force: 0.5 to 2.0 kN, the roll diameter of the pressing roll: φ250 to 350 mm, the roll rotation speed of the pressing roll: 1000 to 2000 rpm, and the traveling speed related to the traveling: 10 to 20 m / min.

12. The steel plate polishing method according to claim 8, characterized by satisfying at least one of the following: the pressing force: 0.5 to 2.0 kN, the roll diameter of the pressing roll: φ250 to 350 mm, the roll rotation speed of the pressing roll: 1000 to 2000 rpm, and the traveling speed related to the traveling: 10 to 20 m / min.

13. The steel plate polishing method according to claim 9, characterized by satisfying at least one of the following: the pressing force: 0.5 to 2.0 kN, the roll diameter of the pressing roll: φ250 to 350 mm, the roll rotation speed of the pressing roll: 1000 to 2000 rpm, and the traveling speed related to the traveling: 10 to 20 m / min.

Images