In an automatic wet sanding apparatus including a paper peeling unit that has a clamping shaft and a clamping hook, an inclination angle of a leading end surface of the clamping hook is equal to an inclination angle of an outer circumferential surface of a cushion pad at the start of a paper peeling step. Thus, the leading end surface of the clamping hook comes into contact with an outer circumferential end of a disc at the same time as coming into contact with the outer circumferential surface of the cushion pad, so that the cushion pad is less likely to get caught due to deformation of the outer circumferential surface and its peripheral part of the cushion pad. It is therefore possible to appropriately remove the sandpaper from the cushion pad and stably perform the task of removing the sandpaper.

In an automatic wet sanding apparatus including a paper peeling unit that has a clamping shaft and a clamping hook, an inclination angle of a leading end surface of the clamping hook is equal to an inclination angle of an outer circumferential surface of a cushion pad at the start of a paper peeling step. Thus, the leading end surface of the clamping hook comes into contact with an outer circumferential end of a disc at the same time as coming into contact with the outer circumferential surface of the cushion pad, so that the cushion pad is less likely to get caught due to deformation of the outer circumferential surface and its peripheral part of the cushion pad. It is therefore possible to appropriately remove the sandpaper from the cushion pad and stably perform the task of removing the sandpaper.

In an automatic wet sanding apparatus including a disc and a cushion pad, a disc center hole is formed at a central portion of the disc and a pad center hole is formed at a central portion of the cushion pad. Water having been supplied to an introduction space inside a skirt is stirred as an eccentric head rotates eccentrically and thereby pushed out toward a painted surface via the disc center hole and the pad center hole with enhanced pressure. Thus, sanding dust resulting from automatic wet sanding can be washed away toward an outer circumferential side by the water that is pushed out toward the outer circumferential side, so that the likelihood of clogging due to sanding dust can be reduced and high sanding efficiency can be maintained.

An automatic wet sanding apparatus is equipped with a suction unit having a suction nozzle that is located under an automatic wet sanding unit in a state where automatic wet sanding is performed and a suction device that generates a suction force for suctioning water through the suction nozzle, so that water having been used for automatic wet sanding can be suctioned through the suction nozzle. This can significantly reduce the amount of water containing sanding dust that flows down a painted surface under the suction nozzle, and thereby reduce the amount of sanding dust that remains on the painted surface after completion of automatic wet sanding. As a result, it is possible to achieve a quality finish on the painted surface while eliminating the need for the troublesome task of wiping off remaining sanding dust.

An air cylinder that changes the posture of an automatic wet sanding unit main body having sandpaper mounted thereon is provided with a guide rod, and an outer circumferential surface of the guide rod has grooves that extend along a shaft centerline of the guide rod and have an arc-shaped cross-section. Balls are interposed between a bottom of each groove and an inner surface of a bush that is provided inside the air cylinder. Thus, it is possible to make two objects compatible with each other: to achieve high-accuracy automatic wet sanding by enhancing the adaptability of the sandpaper to the shape of a painted surface through a reduction of the diameter of the piston rod; and to enhance the durability of the automatic wet sanding apparatus.

An air cylinder that changes the posture of an automatic wet sanding unit main body having sandpaper mounted thereon is provided with a guide rod, and an outer circumferential surface of the guide rod has grooves that extend along a shaft centerline of the guide rod and have an arc-shaped cross-section. Balls are interposed between a bottom of each groove and an inner surface of a bush that is provided inside the air cylinder. Thus, it is possible to make two objects compatible with each other: to achieve high-accuracy automatic wet sanding by enhancing the adaptability of the sandpaper to the shape of a painted surface through a reduction of the diameter of the piston rod; and to enhance the durability of the automatic wet sanding apparatus.

A grinding liquid trough arrangement for a grinding machine having a grindstone, wherein said grinding liquid trough arrangement comprises: a trough for grinding liquid formed by a trough wall, wherein the trough is configured to be arranged at a grinding machine having a grindstone such that the trough encloses a portion of a grindstone, wherein, the trough wall comprises at least one metal element which is attractable to magnets, and that, the grinding liquid trough arrangement comprises at least one magnetic element which is configured to be detachable attached to an external side of the trough wall by means of magnetic attraction between the magnetic element and the metal element.

A grinding liquid trough arrangement for a grinding machine having a grindstone, wherein said grinding liquid trough arrangement comprises: a trough for grinding liquid formed by a trough wall, wherein the trough is configured to be arranged at a grinding machine having a grindstone such that the trough encloses a portion of a grindstone, wherein, the trough wall comprises at least one metal element which is attractable to magnets, and that, the grinding liquid trough arrangement comprises at least one magnetic element which is configured to be detachable attached to an external side of the trough wall by means of magnetic attraction between the magnetic element and the metal element.

A device for grinding a continuously cast product, in particular a slab (11), a billet or a block. The Device has at least one rotationally operated abrasive disk (10), which is attached to a grinding head (15). At least one high-pressure air nozzle (14) is arranged on the grinding head (15). The high-pressure air nozzle blows the continuously cast product free of particles adhering to or lying on the continuously cast product prior to grinding.

Provided is a polishing apparatus and polishing method which can preferably adjust a temperature of a surface of a polishing pad. A polishing apparatus includes: a polishing table configured to be rotatable, and to support the polishing pad; a substrate configured to hold an object to be polished, and to press the object to be polished against the polishing pad; a polishing liquid supplying portion configured to supply a polishing liquid to a polishing surface; a polishing liquid removing portion configured to remove the polishing liquid from the polishing surface; and a temperature adjuster configured to adjust a temperature of the polishing surface. In a rotating direction of the polishing table, the polishing liquid supplying portion, a polishing region where the object to be polished is pressed against the polishing surface by the substrate, the polishing liquid removing portion, and the temperature adjuster are disposed in this order.