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EP0339659A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and apparatus for controlling drilling operation

Assignee: Subaru Corp
•
Filing: 1989-04-27
•
Granted: —
•
Expires: 2009-04-27
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Abstract

Abstract In drilling control method and apparatus for making holes through a composite workpiece (3) made of a plurality of materials (3a, 3b) having different machining properties, the workpiece (3) is first drilled at a feeding speed and a rotational speed of a drill (1) which are selected. When the drilling of the workpiece is initiated, the amounts of the feed speed and the rotational speed are detected by a feed speed sensor (5) and a rotational speed sensor (6), respectively, and thrust force applied to the drill during the drilling is also detected by a thrust sensor (8). The detected feed speed and the rotational speed of the drill (1) are compared in a comparison unit (7) with optimum values which are adapted to the detected thrust force. When the detected values of the feed speed and the rotational speed of the drill coincide substantially with the optimum values, the drilling operation is performed, while when the detected values of the speed do not coincide with the optimum values, the feed speed and rotational speed of the drill are changed to the optimum values.

Inventors

  • 👤 Yukitaka Aihara

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 04:03
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4163; G05B2219/00; G05B2219/30; G05B2219/45; G05B2219/45129; Y; Y10; Y10T; Y10T408/00; Y10T408/03; Y10T408/16; Y10T408/165; Y10T408/17

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 77 words
A method of controlling drilling operation, characterized by the steps of: initiating the drilling operation at a feed speed and a rotational speed of a drill (1); detecting the feed speed and the rotational speed of the drill (1) and thrust force applied to the drill; and controlling the feed speed and the rotational speed of the drill based on the detected thrust force so as to maintain an optimum drilling condition with respect to the material.
Claim 2
Independent Claim 77 words
A method of controlling drilling operation, characterized by the steps of: initiating the drilling operation at a feed speed and a rotational speed of a drill (1); detecting the feed speed and the rotational speed of the drill (1) and thrust force applied to the drill; and controlling the feed speed and the rotational speed of the drill based on the detected thrust force so as to maintain an optimum drilling condition with respect to the material.
Claim 3
Independent Claim 128 words
An apparatus for controlling drilling operation of a drilling unit having a drill, characterized in that the apparatus comprises: a sensor (5) for detecting a feed speed of the drill (1); a sensor (6) for detecting a rotational speed of the drill; a sensor (8) for detecting a thrust force applied to the drill (1) while the drilling operation is carried out for a material (3); comparison means (7) for comparing outputs of said sensors (5, 6, 8) with optimum values for said material; correction means (10) for correcting the feed speed and the rotational speed according to a result of comparison; and control circuit (4) for controlling the feed speed and the rotational speed of the drill (1) according to an output of the correction means (10).
Claim 4
Independent Claim 128 words
An apparatus for controlling drilling operation of a drilling unit having a drill, characterized in that the apparatus comprises: a sensor (5) for detecting a feed speed of the drill (1); a sensor (6) for detecting a rotational speed of the drill; a sensor (8) for detecting a thrust force applied to the drill (1) while the drilling operation is carried out for a material (3); comparison means (7) for comparing outputs of said sensors (5, 6, 8) with optimum values for said material; correction means (10) for correcting the feed speed and the rotational speed according to a result of comparison; and control circuit (4) for controlling the feed speed and the rotational speed of the drill (1) according to an output of the correction means (10).
Claim 5
Dependent Claim 35 words
The apparatus according to claim 2 wherein said comparison means is a central processing unit (7) which compares the outputs of said sensors (5, 6, 8) with optimum values memorized beforehand in said means (7).

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