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:
Nov. 22, 1988
Filed:
Jan. 28, 1986
Applicant:
Inventor:
Alfred Feuser, Lohr-Rodenbach, DE;
Assignee:
Mannesmann Rexroth GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23F / ;
U.S. Cl.
CPC ...
409-2 ; 409 35 ;
Abstract
A machine tool comprising an axially reciprocating tool is driven by a hydraulic jack or lifting cylinder which is controlled by a servovalve. The amplitude and velocity of the lifting cylinder is set at a control circuit to which the position and acceleration of the lifting cylinder are applied as input variables. The electrohydraulic control has a high damping and high gain. As a result the velocity change of the lifting cylinder when the tool enters the workpiece is negligibly small.