The present invention relates to a device for partial decoating and/or machining removal of a steel sheet coated with a metal coating and/or provided with a parasitic layer, wherein the device has a machining tool in the form of a scraping roller and wherein the scraping roller comprises a cutting edge for scraping the metal coating and/or parasitic layer off the steel-sheet surface, and wherein furthermore the scraping roller is rotatable about a rotation axis perpendicular to a main plane of extent of the steel sheet, the scraping roller has a circumferential face which is concentric with the rotation axis and in which at least one circumferential groove is formed, the groove has two lateral groove boundary faces that originate from the groove bottom face, wherein at least one of the two groove boundary faces has the cutting edge and the device is configured such that during decoating and/or machining removal, the at least one cutting edge scrapes over the steel-sheet edge in a manner parallel to the main plane of extent of the steel sheet.

The present invention relates to a device for partial decoating and/or machining removal of a steel sheet coated with a metal coating and/or provided with a parasitic layer, wherein the device has a machining tool in the form of a scraping roller and wherein the scraping roller comprises a cutting edge for scraping the metal coating and/or parasitic layer off the steel-sheet surface, and wherein furthermore the scraping roller is rotatable about a rotation axis perpendicular to a main plane of extent of the steel sheet, the scraping roller has a circumferential face which is concentric with the rotation axis and in which at least one circumferential groove is formed, the groove has two lateral groove boundary faces that originate from the groove bottom face, wherein at least one of the two groove boundary faces has the cutting edge and the device is configured such that during decoating and/or machining removal, the at least one cutting edge scrapes over the steel-sheet edge in a manner parallel to the main plane of extent of the steel sheet.

A method for machining a metallic member to provide a finished appearance uses a lathe and a scraping process. A metallic member comprising a top portion and a peripheral sidewall is provided, the metallic member is positioned on the worktable. The worktable is rotated with the metallic member, the lathe tool moved backwards and forwards to machine the top portion of the rotary metallic member circumferentially. The lathe tool is moved by the moving device along a predetermined path relative to the worktable to machine curved surfaces of the top portion of the metallic member. The scraping cutter is moved to contact the peripheral sidewall of the metallic member. The scraping cutter is moved along a predetermined path, and the scraping cutter is fed the metallic member to achieve the required shape and finish.

A method for machining a metallic member to provide a finished appearance uses a lathe and a scraping process. A metallic member comprising a top portion and a peripheral sidewall is provided, the metallic member is positioned on the worktable. The worktable is rotated with the metallic member, the lathe tool moved backwards and forwards to machine the top portion of the rotary metallic member circumferentially. The lathe tool is moved by the moving device along a predetermined path relative to the worktable to machine curved surfaces of the top portion of the metallic member. The scraping cutter is moved to contact the peripheral sidewall of the metallic member. The scraping cutter is moved along a predetermined path, and the scraping cutter is fed the metallic member to achieve the required shape and finish.

An object is to prolong the life of a ring tool, and improve the productivity of a welded pipe. A ring tool unit is held in a downstream-side end portion of a mandrel to be inserted into a welded pipe currently being manufactured from the upstream side of a welding position, and is used as a cutting tool for continuously cutting a bead produced on the inner surface of the welded pipe, wherein the ring tool unit is formed by fitting a ring tool having a ring-like blade in a sleeve having a circular hole for holding the outer circumference of the ring tool.

A press apparatus according to an embodiment includes an upper die and a lower die, and configured to manufacture a different-thickness metal plate, in which: the lower die includes: a wall surface facing a cavity; a fixing part configured to fix both ends of the metal plate, the both ends of the metal plate being placed so that its plate surface faces upward; and a rotating mechanism configured to rotate the metal plate so that the metal plate is brought into an upright position along the wall surface; and the upper die includes: a slide moving part including an opposed surface opposed to the wall surface and configured to descend in the cavity along the wall surface; and a cutting tool disposed on the opposed surface; and shaving is carried out on at least a part of the plate surface of the metal plate.

An inner burr removal tool holder, including a tool holder body. The tool holder body includes a tool base and a connecting rod assembly. The connecting rod assembly is connected to the tool base. A scraper for removing inner burrs and a nozzle for spraying liquid is arranged on the tool base. The scraper protrudes from an outer surface of the tool base, and a liquid outlet of the nozzle faces the scraper.