Title:
【発明の名称】真空ア-ク炉内の被溶解材料表面からの溶解電極の距離を制御する装置
Document Type and Number:
Japanese Patent JPS63502785
Kind Code:
A
Abstract:
PCT No. PCT/DE87/00487 Sec. 371 Date Aug. 10, 1987 Sec. 102(e) Date Aug. 10, 1987 PCT Filed Nov. 29, 1986 PCT Pub. No. WO87/03772 PCT Pub. Date Jun. 18, 1987.Apparatus for controlling the distance of a melting electrode from the surface of melted material in a vacuum arc furnace which uses short circuits caused by the droplets between the melting electrode and the surface of the melted material as a control criterion. The short circuits occurring within a given period of time-the so-called droplet rate-are determined and supplied to an averager which is connected with a controller that controls an electric driving mechanism for the melting electrode. According to the invention, the controller is responsive to a signal representing the difference between the reciprocal value of the droplet rate signal formed by the averager and a desired time, this desired time being equal to the desired average time between two consecutive droplet short circuits.
Inventors:
Stenzel Otto
Thomas Friedrich-Bernell
Thomas Friedrich-Bernell
Application Number:
JP50627986A
Publication Date:
October 13, 1988
Filing Date:
November 29, 1986
Export Citation:
Assignee:
Reybold-Hereus Gezershyaft Mitt Bethile Renktel Haftung
Reybold Actien Gezel Shaft
Reybold Actien Gezel Shaft
International Classes:
H05B7/148; F27D11/10; H05B7/152; (IPC1-7): F27D11/10; H05B7/148
Foreign References:
| US4578795A | 1986-03-25 | |||
| US0430797A | 1890-06-24 |
Attorney, Agent or Firm:
Takeshi Nara