Device and method for the finishing machining of an internal face of a workpiece, such as the track of a ball screw, including a workpiece holder and a finishing tool held on a finishing tool holder. A rotary drive is provided, by which the workpiece holder and the finishing tool is rotationally driven relative to one another about a rotational axis. A linear drive is provided, by which the finishing tool held on the finishing tool holder and the workpiece holder is driven in a translatory manner relative to one another along the rotational axis. An oscillating drive is provided, by which the finishing tool held on the finishing tool holder and the workpiece holder is driven in an oscillating manner relative to one another in the direction parallel to the rotational axis and wherein the finishing tool is pivotably held on the finishing tool holder about a pivot axis.

A method for forming a profile having at least three consecutive concave surfaces in an internal surface of a metal part includes piercing the metal part to create at least three consecutive concave surfaces. First, second and third concave surfaces respectively have first, second and third radii of curvature. The second concave surface is between the first and third concave surfaces. The second radius of curvature is different from the first and third radii of curvature. The method includes carburizing the metal part, grinding the second concave surface, and linear broaching the first and third concave surfaces with an abrasive-covered broach. A method for forming a groove in a surface of a metal part includes broaching the surface to create a groove having a groove surface, carburizing the metal part, and broaching a portion of the groove surface with an abrasive-covered broach after carburizing the metal part.

A method for forming a profile having at least three consecutive concave surfaces in an internal surface of a metal part includes piercing the metal part to create at least three consecutive concave surfaces. First, second and third concave surfaces respectively have first, second and third radii of curvature. The second concave surface is between the first and third concave surfaces. The second radius of curvature is different from the first and third radii of curvature. The method includes carburizing the metal part, grinding the second concave surface, and linear broaching the first and third concave surfaces with an abrasive-covered broach. A method for forming a groove in a surface of a metal part includes broaching the surface to create a groove having a groove surface, carburizing the metal part, and broaching a portion of the groove surface with an abrasive-covered broach after carburizing the metal part.

Thread repair tools are disclosed. Methods of making thread repair tools, and methods of using thread repair tools are also disclosed.

A transverse hairline forming apparatus includes a coil supporting unit to which a stainless steel coil is rotatably disposed; a coil winding unit spaced apart from the coil supporting unit, the coil winding unit holding and winding an end of the stainless steel coil; and at least one pair of surface treatment units disposed between the coil supporting unit and the coil winding unit, the at least one pair of surface treatment units configured to form transverse hairlines on a surface of the stainless steel coil perpendicular to a winding direction of the stainless steel coil. While the stainless steel coil is unwound and rewound on the coil winding unit, when the stainless steel coil passes below the at least one pair of surface treatment units, the at least one pair of surface treatment units form the transverse hairlines on the surface of the stainless steel coil.

A grinding method for grinding a workpiece by use of a grinding apparatus including a holding table that holds the workpiece by a holding surface, and a grinding unit that grinds the workpiece held by the holding table by a grinding wheel having a plurality of grindstones arranged in an annular pattern includes a groove forming step of grinding the workpiece by bringing the grindstones into contact with the workpiece to form the workpiece with an arcuate groove having a depth of less than a finished thickness of the workpiece, and a grinding step of bringing the grindstones into contact with a surface side of the workpiece where the groove is formed to grind the workpiece until the thickness of the workpiece becomes the finished thickness.

A grinding method for grinding a workpiece by use of a grinding apparatus including a holding table that holds the workpiece by a holding surface, and a grinding unit that grinds the workpiece held by the holding table by a grinding wheel having a plurality of grindstones arranged in an annular pattern includes a groove forming step of grinding the workpiece by bringing the grindstones into contact with the workpiece to form the workpiece with an arcuate groove having a depth of less than a finished thickness of the workpiece, and a grinding step of bringing the grindstones into contact with a surface side of the workpiece where the groove is formed to grind the workpiece until the thickness of the workpiece becomes the finished thickness.

The invention describes an additional manufacturing method to improve the metallurgical properties of an endodontic file, which method customizes torsional and cyclic fatigue resistance behavior performance for separate files sizes. A heat-treatment file size tailored method accomplished after grinding the blank is disclosed aiming to improve the elasticity behavior of the specific file size based on its application during instrumentation protocol, also generating a colored oxidation layer on the working part surface of the file. The colored coded customized heat-treatment process will help the operator to identify the improved metallurgical properties behavior of each file, and decide the best use of such files.

Disclosed are various embodiments for a system and method of processing a surface using a mixture containing magnetic particles. A mixture is disposed on a workpiece and exposed to a dynamic magnetic field. In response to the dynamic magnetic field, the magnetic particles of the mixture may move along the workpiece. The movement of the magnetic particles creates a pattern of grooves on the surface of the workpiece.

Disclosed are various embodiments for a system and method of processing a surface using a mixture containing magnetic particles. A mixture is disposed on a workpiece and exposed to a dynamic magnetic field. In response to the dynamic magnetic field, the magnetic particles of the mixture may move along the workpiece. The movement of the magnetic particles creates a pattern of grooves on the surface of the workpiece.