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:
Jun. 26, 1979
Filed:
Jun. 13, 1977
Applicant:
Inventors:
Assignee:
Rolls-Royce (1971) Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P / ; B23P / ;
U.S. Cl.
CPC ...
219 / ; 2041291 ; 20412975 ; 219 / ;
Abstract
The production of passages in workpieces is described by an electrical method which simultaneously utilizes electrochemical and electrical discharge machining with a single electrode and dilute electrolytes. The method overcomes the metallurgical defects inherent in the recast layer left by electrical discharge machining which is removed by electrochemical machining. The method is particularly suited to producing cooling passages in the turbine blades of gas turbine engines and can be used to produce venturi shaped holes with rounded edges.