Nsk Corporation

Takaji Iwasawa

Masami Tanaka

Hiroyuki Ikeda

Akio Sakai

Katsuyuki Yamamoto

Yuko Kamamura

Shoji Horike

A grinding apparatus for grinding a spline ball groove on a workpiece comprises a rod-shaped grindstone, having a distal end portion with a curved surface corresponding to the groove to be ground, and a spindle mechanism for rotating the grindstone. The spindle mechanism and the grindstone are supported by means of a supporter in a manner such that they are inclined at a given angle to an axis of the workpiece. A rotary dresser, which has a dress groove corresponding to the curved surface of the distal end portion of the grindstones is disposed near the grinding apparatus. The grindstone can be reciprocated along the axis of the workpiece by a drive mechanism between the workpiece and the dresser without changing its angle of inclination.

Method and apparatus for forming grooves on a workpiece and for dressing a grindstone used in the groove formation

A grinding apparatus for grinding a spline ball groove on a workpiece comprises a rod-shaped grindstone, having a distal end portion with a curved surface corresponding to the groove to be ground, and a spindle mechanism for rotating the grindstone. The spindle mechanism and the grindstone are supported by means of a supporter in a manner such that they are inclined at a given angle to an axis of the workpiece. A rotary dresser, which has a dress groove corresponding to the curved surface of the distal end portion of the grindstone, is disposed near the grinding apparatus. The grindstone can be reciprocated along the axis of the workpiece by a drive mechanism between the workpiece and the dresser without changing its angle of inclination.

Method for forming grooves on workpiece and for dressing a grindstone used in the groove formation

While rotating a spindle the circular hole is worked using a cutting tool Before or after the working operation of the circular hole a chuck is translated in a direction perpendicular to the rotation center axis of the spindle by a slider And, the flat surface as well as the stepped surfaces and inner surfaces which are respectively composed of partially tubular surfaces, are cut or worked.

Trunnion for half-toroidal-type continuously variable transmission and method for working the same

Grinding apparatus for forming grooves on a workpiece and a method for dressing a grindstone used in the apparatus

Growing community of inventors

Maebashi, Japan

Takaji Iwasawa