Nsk Corporation

Masami Shinomoto

Chuichi Sato

Katsuhisa Tonooka

Hiroyuki Nojima

Tomita Suzuki

Kunio Kawashima

A sphere grinding apparatus (1) for grinding spheres by two discs consisting of a rotational disc (5) and a stationary disc (6), the sphere grinding apparatus (1) incorporating: a central shaft (3) slidable in an axial direction; and a housing (4) for rotatively supporting the central shaft (3), wherein the rotational disc (5) is joined to the central shaft (3) and the stationary disc (6) is joined to the housing (4). Accordingly, it is possible to provide a sphere grinding apparatus which is capable of improving a machining accuracy and which has a simple structure and the cost of which can be reduced.

Sphere grinding apparatus

A sphere polisher capable of making uniform conditions under which balls are polished is provided. The inner and outer polishing circuits are defined by the grooves 23 provided on the rotative disc 10 and the fixed disc 20. The storage conveyor 50 is provided with an outer ball guiding passage 55 and an inner ball guiding passage 56. The ball supply chute 57 is provided with the inner chute portion 57a connecting the inner polishing circuits with the outer ball guiding passage 55, and the outer chute portion 57b connecting the outer polishing circuits with the inner ball guiding passage 56. The ball discharge chute 58 is provided with the inner discharge chute portion 58a connecting the inner polishing circuits with the inner ball guiding passage 56, and the outer discharge chute portion 58b connecting the outer polishing circuits with the outer ball guiding passage 57.

Sphere polisher

In a bore size correcting apparatus, a passing-through jig of an extended type lapping reamer in the bore size trimming device is passed through the bore surface of the workpiece machined by the bore grinding machine to correct the inner size of the workpiece, either one of the bore size to be corrected and a corrected bore size of the workpiece is measured by the bore size measuring device, a signal is outputted in accordance with the corrected bore size, and in response to the output signal, a machining command is supplied from the bore size control device to at least one of the in-process fixed-size control device and the external size control device. Thus, the bore size of the workpiece roughly manufactured by grinding can be precisely finished, with no skill, so as to have any optional set value, and the correction apparatus is also made compact and inexpensive.

Growing community of inventors

Kanagawa, Japan

Masami Shinomoto