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:
Aug. 15, 2017
Filed:
Feb. 06, 2014
Nsk Ltd., Tokyo, JP;
Takashi Yoshimura, Kanagawa, JP;
Yoshiteru Kondo, Gunma, JP;
NSK LTD., Tokyo, JP;
Abstract
The present invention prevents the occurrence of variation in the lead of a threaded section of a machined article () resulting from the effects of thermal expansion of the machined article () during machining. A thermal expansion amount that relates to the axial direction of the machined article () during machining is measured by measurement means (), history information for the thermal expansion amount that relates to the machined article () during machining is obtained from the result of the aforementioned measurement, and a control unit () determines the relative rotational speed of a rotary drive shaft () or the feeding speed of an axial feeding device () with respect to the next machined object () that is to be machined on the basis of the history information for the thermal expansion amount of the machined object () that has been machined.