Toyoda Koki Kabushiki Kaisha

Jtekt Corporation

Shoichi Sano

Masahiro Ido

Toshio Maruyama

Ryohei Mukai

Kikutoshi Okada

Makoto Nonoyama

Tadashi Yamauchi

Mamoru Katsuta

Kazuo Machida

Satoshi Yamaguchi

Ikuo Ohtsu

Goro Terahara

Yukiharu Tsuchiya

Tomohiko Yamaguchi

Kinichi Kataoka

Masakazu Yamaguchi

Kenzaburo Oishi

A grinding wheel having a grindstone portion formed on a core includes slippery fluoroplastic coating films that prevent attachment of foreign matter, the coating films being provided on the portions of the core, with which portions the foreign matter can be brought into contact.

Grinding wheel

A method for measuring the diameter and eccentricity of a crankpin of a crankshaft which is ground on a grinding machine. A reference plate is provided on a headstock, which is disposed on a table to support the crankshaft. A measurement apparatus having a probe is disposed on a wheel head. Through movements of the table and the wheel head, the probe is first brought into contact with a reference surface of the reference plate, and is then brought into contact with the outer circumferential surface of the crankpin at outermost and innermost points. The distances between the reference surface and the outermost and innermost points are measured, and the diameter and eccentricity of the crankpin are calculated on the basis of the measured distances and the position of the reference surface.

Method for measuring work portion and machining method

A combination grinding machine grinds a plurality of axially arranged portions of a workpiece by use of a grinding wheel supported rotatably on a first wheel head and a superfinishing wheel supported rotatably on a second wheel head. A numerical control unit controls feed units for the first and second wheel heads in order to move the first and second wheel heads independently of each other in the axial direction of the workpiece and in the direction perpendicular to the axial direction, such that each of the axially arranged portions is ground by the grinding wheel, and simultaneously with this, another ground portion is superfinished by the superfinishing wheel.

Combination grinding machine

A grinding machine includes a spindle head for rotatably driving a crankshaft around a journal center as a rotational axis and, two wheel heads that support respective two grinding wheels and that advance and retract in a direction perpendicular to the rotational axis independently with each other. Two of plural pin portions of the rotating crankshaft are simultaneously ground by the respective two grinding wheels, in which rotational phases of the two pin portions are different from each other. Further, the rotational phases of the two pin portions are stored as a combination in a memory. The two pin portions are simultaneously ground in accordance with the combination by the respective two grinding wheels.

Apparatus for and a method of machining two portions

A spindle apparatus for supporting and rotating a workpiece in a grinder. The spindle apparatus includes a workpiece spindle rotatably supported on a spindle head and driven for rotation by a motor, and a spindle plate mounted to the front end of the workpiece spindle and including an eccentric drive pin. The workpiece spindle has a bore in which a ram is axially movable. A center is fit in the front end of the ram. A unit is provided to advance the ram to engage with one end of the workpiece when the workpiece is to be supported. A rotary sleeve is rotatably supported on the front end of the ram and includes an engagement portion which is displaceable in the axial direction of the spindle and engageable with the drive pin in the direction of rotation. A driving unit is mounted to the front of the rotary sleeve to engage the workpiece in the direction of rotation when the ram is in its advanced position to thereby transmit rotation.

Spindle apparatus for supporting and rotating a workpiece

A method for truing a grinding wheel having a non-straight cylindrical grinding surface. In truing operation, a truing tool is caused to contact different portions of the grinding surface, and relative position of the truing tool is detected when the truing tool contacts the respective portions. Then, a first portion rom which a largest amount of abrasive layer must be removed, and a second portion from which a smallest amount of abrasive layer must be removed are found out. Based upon the detected positions, the radial location of an initial truing start position and a truing operation end position are calculated. The truing tool is initially moved to the initial truing start position, and then traversed from the truing start position along a locus corresponding to a desired final shape of the grinding wheel. The radial location of the truing start position is then shifted in a direction of approaching to the rotational axis of the grinding wheel, and the traverse movement is repeated. When the radial location of the truing start position reaches or exceeds the truing operation end position, the truing operation is stopped.

Method and apparatus for truing a grinding wheel

An apparatus for loading and unloading a workpiece between a working position of a machine tool and a waiting position provided outside the machine tool. The apparatus comprises a rotational shaft which is supported to be rotatable about its axis extending in parallel with an axis of a work spindle, and is rotated in a clockwise direction or a counterclockwise direction within a required rotational angle by an actuator. On a bracket fixed on one end of the rotational shaft, there are installed a loading arm unit and an unloading arm unit. The loading arm unit and the unloading arm unit are arrayed in a direction of the axis of the work spindle, and extend in an up-and-down direction along a pair of lines, which intersect with each other at a predetermined angle so as to interact at the working position, respectively. Each of the loading arm unit and the unloading arm unit has a pair of gripping claws extending in a direction which is normal to the axis of the work spindle.

Growing community of inventors

Gamagori, Japan

Shoichi Sano