The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1994
Filed:
Apr. 22, 1993
Fumitoshi Terasaki, Niwa, JP;
Tatsuhiro Yoshimura, Niwa, JP;
Okuma Corporation, Nagoya, JP;
Abstract
When a non-circular workpiece is to be machined by an NC cylindrical grinding machine, the latter is controlled such that the velocity of each of the main spindle and grinding head does not exceed a threshold allowable by the machine. A non-circle data pre-processing section is provided to convert a group of angle and lift points relating to the shape data into profile data to determine the complete circumferential length of the profile. The circumferential length of the profile is divided into line segments of minute and equal length at a plurality of division points. When the tool is brought into contact with the workpiece at each of the division points, a reference X/C axes data relating to the X-axis position of the tool and the rotational angle of the main spindle at this time is prepared. The reference X/C axes data are selected out to prepare temporary X/C axes data which in turn are used to determine the velocity, acceleration and rate of acceleration change in each of the main spindle and tool head. These determined values are compared with the respective thresholds. If they exceed the respective thresholds, the rate of selecting is changed. If the calculated values do not exceed the respective thresholds, the temporary X/C axes data is taken as modified X/C axes data. The machining will be carried out in accordance with the modified X/C axes data.