JPH0541385B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Industrial Application Field The present invention relates to equipment for grinding both sides of a plated steel strip. (b) Prior Art In the continuous electroplating of steel strips, there is a problem in which excessive plating occurs at the edges, called edge over coating, due to concentration of plating current on both sides of the steel strip. The thickening film, which is excessively deposited due to the concentration of current on both sides of the steel strip, has dendrite-like precipitation and is brittle and easily peels off.
When used in press molding or the like by a user, indentation flaws are likely to occur due to peeled pieces, and it is necessary to prevent the generation of excessive deposits. Conventionally, as a countermeasure against excessive plating on both sides of the steel strip, a method called edge masking has been used to limit the effective anode width according to the sheet width to alleviate current concentration on the side surfaces and reduce plating adhesion. It's here. However, in a continuous electroplating line, it is difficult to continuously adjust the masking position in response to changes in sheet width, meandering of the steel strip, etc. That is, in the edge masking method, an edge position control device called EPC is used as a mechanism for changing the plate width and tracking the steel strip with the effective anode width. However, in an acidic hydrogen atmosphere such as in a continuous electroplating line, the detection device is corroded, making it difficult to put it into practical use, resulting in a lack of reliability. Therefore, the present applicant first proposed an edge masking device that is not a high-grade and delicate device like the above-mentioned edge masking device, but is capable of withstanding use in the corrosive environment of a normal electroplating line, and that the edge masking device is not one that is high-grade and delicate, but is capable of withstanding excessive adhesion on the side surface of the plated steel strip. We proposed a device that could handle plating (Utility Application No. 1983-041669).
This strip end grinding device has an electric rotating brush mounted on a stand, and the central part of the brush skews the brush rotation axis within a range of 60 degrees from parallel to the strip end surface, and grinds the strip in the width direction while making contact with the strip end surface. The mount is installed so that it moves forward and backward toward the end surface of the strip, and as the position of the end face of the strip changes, the change in the current value based on the change in the load transmitted to the motor that rotates the brush in contact with the end surface is used as a control current to move the mount back and forth. The structure is characterized in that it follows the positional fluctuations of the strip end face. However, as will be described later, even with this device, although it is effective in the case of single-sided plating, a sufficient grinding effect cannot be obtained in the case of double-sided plating. In addition, as a device for mechanically grinding the side surface of a steel strip, there is a device for grinding the side surface using a jig equipped with a tool bit (Japanese Utility Model Application Publication No. 55-91862), or a device for grinding the side surface with a scraper (Japanese Utility Model Application No. 1983-1989). -133567) etc. have been proposed. However, all of these devices have problems in following the meandering of the steel strip, and it is difficult to create a side surface without plating over the entire length. (c) Problems to be Solved by the Invention The problem to be solved by the present invention is to obtain equipment that can completely remove the plating coating on both sides of a double-sided plated steel strip. (d) Means for Solving the Problems The double-sided grinding equipment for a plated steel strip of the present invention is an equipment for removing a blinding film adhering to both sides of a double-sided plated steel strip in the width direction of the steel strip. At least two side grinding devices are installed along the traveling direction of the steel strip, and each device is opposed to each other in the width direction of the steel strip. The rotating axes of the rotating brushes are tilted in the same direction with respect to the traveling direction of the steel strip, and the rotating brushes that are adjacent to each other in the traveling direction of the steel strip on the same side of the steel strip are rotated from top to bottom on the side of the steel strip, and the other The brush is set to grind from the bottom to the top, and a detector detects fluctuations in the driving load of the motor that rotates the rotating brush, and sends it to the control panel, and a control signal is sent to the rotating brush to adjust the width of the steel strip. This problem is solved by means arranged to adjust the position of the rotating brush by sending it to a motor that moves in the same direction. (E) Embodiments An embodiment of the equipment for grinding both sides of a plated steel strip according to the present invention will be described with reference to the drawings. First, the equipment for grinding both sides of a plated steel strip according to the present invention is provided downstream of the electroplating equipment. The overall configuration of a double-side grinding equipment 100 for plated steel strip according to the present invention is shown in FIG. Equipment 100 of the present invention
At least two side surface grinding devices 1 are provided along the traveling direction of the steel strip S to engage rotating brushes 110 on both sides of the steel strip S to grind both sides. The side surface grinding device 1 has units 10 of the same structure arranged opposite to each other in the width direction of the steel strip S. That is, the rotating shafts 111 of the rotating brushes 110 that face each other in the width direction of the steel strip are tilted in the same direction and their rotation directions are opposite to each other, and the rotating shafts 111 of the rotating brushes 110 that are adjacent to each other in the direction of movement of the steel strip 8 are tilted in the same direction.
are tilted in opposite directions and their rotation directions are opposite to each other. The rotating shafts 111 of the rotating brushes 110 of each device 1 may be in the same direction, but as shown in FIG. will be carried out, so
More preferred. In order to follow the meandering of the steel strip S, the rotating brush 1
The detector 130 detects fluctuations in the drive load of the motor 120 that drives the rotary brush 10 and sends it to the control panel 140, which sends control signals to the motors 150 and 161 to adjust the position of the rotating brush 110. Although such a control system is provided in both units 10, for convenience of explanation, only one unit 10 is provided.
Only the following are illustrated. The side surface grinding device 1 utilizes the device disclosed in Utility Application No. 1983-041669 filed by the applicant mentioned above. The configuration of this device 1 will be explained below with reference to FIGS. 3 to 9. The device 1 is made up of a pair of units 10 of identical construction. For convenience of explanation, one unit 10 will be described below. First, as best shown in FIG. 3, FIG. 4, and FIG. , which can be slid along a screw rod 162 by a motor 150 exclusively for medium and low speeds. In this structure, a pedestal 163 is provided so as to be slidable back and forth across guide bars 164 on the left and right sides of a base 160. A bracket 165 hangs down from the pedestal 163, and a worm gear 166 is rotatably attached to it as shown in FIG. Worm gear 166 threads onto screw rod 162.
A worm 167 meshes with the worm gear 166, and a belt pulley 169 fits into a spline shaft 168 of the worm 167. On the other hand, the frame 163 is equipped with a motor 150 exclusively for medium and low speeds.
is mounted, and its electric motor shaft engages the bevel gear 171 to rotate the other belt wheel 169. A belt 172 is stretched between the belt pulleys 169. Therefore, when the medium-low speed motor 150 rotates, it rotates the worm gear 166 that is screwed into the screw rod 162, and the pedestal 163 aligns with the screw rod 162, so that the direction of rotation of the motor 150 is changed.
It moves back and forth at medium to low speed depending on the rotation speed. Furthermore, when the high-speed dedicated motor 161 rotates the screw rod 162, the pedestal 16 screwed thereon also rotates.
3 moves back and forth along the screw rod 162 at high speed according to the rotational direction and speed of the motor 161. A rotating brush 110 is provided at the tip of the pedestal 163, and a motor 120 for rotating the rotating brush 110 is further attached. 121 is a drive belt. S is a plated steel strip trip as a material to be ground, and as shown in FIG. As described above, it moves forward and backward together with the pedestal 163, following changes in plate width and side position position, and always maintains an appropriate brush reduction amount P.
maintain. In this device 1, plate width fluctuation of plated steel strip S,
The brush drive motor 12 follows the lateral movement.
This is performed using the fluctuation of the current value due to the fluctuation of the zero load as the control input. The speed at which the brush 110 advances and retreats in the plate width direction while contacting the side surface of the plated steel strip S may be constant;
It is preferable that the larger the amount of lateral movement is, the faster the movement is made to advance and retreat, thereby increasing the responsiveness to the amount of lateral movement. In that case, the speed may be made continuously variable, but in practice it is
A step-by-step process is sufficient. As an example, if we take a three-stage case as an example, it will be as shown in FIG. The appropriate reduction amount (mm) of the brush is 4mm.
Assuming that the (+) side is towards the bristles of the brush and the (-) side is towards the bristles of the brush, then D, E,
There are three levels C, B, and A on the F and (-) sides, and motor current values A to F are taken out according to the amount of brush pressure reduction, that is, the brush position. Then, with current value A, the brush 110 moves forward at high speed, with current value A, it moves forward at medium speed, with current value C, it moves forward at low speed, and stops between C and D, with D, it moves back at low speed, at E, it moves back at medium speed, and at F, it moves back at high speed. The brush position change mode is determined according to the current value. The above-mentioned position and speed changes are performed by the control panel 140 (FIG. 1) by switching between the high-speed motor 161 and the medium-low speed motor 150 shown in FIG. 3, as well as forward/reverse rotation and rotational speed control. Due to the above-described operation, brush grinding can be performed while following changes in the width of the plated steel strip S and movement of the side surface position, and keeping the distance between the side surface and the brush constant. Next, as shown in FIG. 8, the rotating shaft 111 of the rotating brush 110, which advances and retreats in the sheet width direction while contacting the side surface of the plated steel strip S, is moved to the side surface of the plated steel strip S (FIG. 10A) or Side plated steel strip side (first
When installed parallel to Figure 1A), the plating film on one edge of the side surface of the plated steel strip will be ground (10th
Figure B, Figure 11B). This is sufficient for over-plating grinding of the side surface of a single-sided plated steel strip, but in the case of a double-sided plated steel strip, grinding remains at the end of one side, making it unsatisfactory (FIG. 11B). Therefore, in the present invention, as shown in FIG. 9, the rotating shaft 111 of the rotating brush 110 is constructed to be tiltable, and the rotating shaft 111 is alternately tilted at different angles as shown in FIG. , B, the directions of rotation are opposite to each other. As a result, even if the side surfaces are warped, the plating coating on the side surfaces of the double-sided plated steel strip is completely ground (FIG. 12C). Further, if chatter occurs in the steel strip S due to the rotation of the brush, the chatter can be suppressed by changing the angle of the rotation axis of the brush. The appropriate skew range is 20 to 45 degrees, but it can be applied within a range of 60 degrees from single-sided plating to double-sided plating depending on the situation. As for the skew device, a schematic diagram of which is shown in FIG. 9, for example, a semicircular arc-shaped rail or gear 112 is mounted on a pedestal 163, and the brush 110 and the brush are driven by a rolling roller or small gear 113 using this as a guide. A motor 120 is mounted so as to be able to rotate about the center point 0 of the rotating axis of the brush, and the motor 120 is mounted so as to be able to rotate around the center point 0 of the rotation axis of the brush, and the motor 120 is mounted so as to rotate around the center point 0 of the rotating shaft of the brush.
This can be easily implemented by providing a semi-circular arc rail or a gear 112 so that it can be fixed thereon. This device can be used, for example, in a continuous plating line for two
The rotating brushes 110 are installed as a set in such a way that they rotate and move forward and backward in the width direction of the plate while contacting both end surfaces of the plated plate, but they may also be installed separately at the later stage of the plating line, and further prevent excessive adhesion. It can also be used for side surface grinding other than spot removal. Grinding results for various materials and dimensions using the equipment of the present invention are shown in Table 1 below.

[Table] ○ indicates no peeling due to plating.
× indicates peeling due to plating.
(f) Effects According to the present invention, it is possible to remove the plating film on both sides of a double-sided electroplated steel strip. No longer needed. As a result, the yield of electroplating is improved.

[Brief explanation of the drawing]

FIG. 1 is a front view of the side surface grinding equipment for plated steel strips of the present invention. FIG. 2 is a side view of FIG. 1 mainly showing the rotating brush portion. FIG. 3 is a plan view of the side grinding device.
FIG. 4 is a side view of FIG. 3. Figure 5 is the − of Figure 4.
Front view seen from the line. FIG. 6 is a side view of the rotating brush. FIG. 7 is a graph showing the relationship between brush reduction amount and motor current value. FIGS. 8 and 9 are schematic explanatory diagrams of a rotating brush support mechanism. FIG. 10 to FIG. 12 are explanatory diagrams of the state of grinding the side surface of the fitted steel strip. 1: Side grinding device, 10: Unit, 110:
Rotating brush, 111: Rotating shaft, 120, 150,
161: Motor, 130: Current detector, S: Plated steel strip.

Claims (1)

[Claims] 1. In equipment for removing the plating film adhering to both sides of a double-sided plated steel strip, rotating brushes are engaged with both sides of the steel strip so as to face each other in the width direction of the steel strip to grind the side surfaces. At least two side grinding devices are provided along the traveling direction of the steel strip, and the rotating shafts of rotating brushes of each device facing in the width direction of the steel strip are tilted in the same direction with respect to the traveling direction of the steel strip, and
Rotating brushes adjacent to each other in the traveling direction of the steel strip on the same side of the steel strip are set so that one brush grinds the side surface of the steel strip from top to bottom, and the other brush grinds from bottom to top, and the rotating brushes are rotated. The sensor is configured to detect fluctuations in the driving load of the driving motor, send it to a control panel, and send a control signal to the motor that moves the rotating brush in the width direction of the steel strip to adjust the position of the rotating brush. Equipment for grinding both sides of plated steel strips.