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:
Sep. 18, 2001
Filed:
Apr. 07, 2000
Makino Milling Machine Co., Ltd., Tokyo, JP;
Abstract
A method and an apparatus for controlling a numerically controlled machine tool, wherein the heat generation amount and the temperature of a drive unit including a servo amplifier,and a feed shaft motor,are computed by a drive unit heat generation amount computing unit,by simulation, and from the computed heat generation amount and the computed temperature, the total heat generation amount of the drive unit, the cutting feed heat generation amount, the cutting load heat generation amount, etc. are computed by a feed heat generation amount computing unit,, so that the cutting feed rate override value of the numerically controlled machine tool,is computed by a cutting feed rate override computing unit,and effectuated by being output to a NC unit. Further, based on the temperature of the drive unit computed by a computing unit,or the temperature computed by a temperature data computing unit,or the temperature detected by a temperature detection sensor,, etc., the proper values of the feed acceleration/deceleration time constants &tgr;,and &tgr;,are computed and output as a ratio with respect to the set and stored initial values &tgr;,and &tgr;,thereby to control the NC commanded rate. The overheating of the feed axis drive unit is prevented while at the same time improving the machining efficiency.