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Method and apparatus for closed-loop control of the electrode separation in a vacuum arc furnace

A vacuum arc furnace, closed-loop control technology, applied in electric heating devices, electrical components, heating by discharge, etc., can solve problems such as solidification errors and increase in alloying elements, and achieve the effect of improving accuracy

Active Publication Date: 2015-07-01
ALD VACUUM TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the lip of the electrode with varying arc spacing grows or shrinks so that growth can occur and cause uncontrolled oscillations leading to coagulation errors
Therefore, an increased loss of alloying elements can also result

Method used

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  • Method and apparatus for closed-loop control of the electrode separation in a vacuum arc furnace
  • Method and apparatus for closed-loop control of the electrode separation in a vacuum arc furnace
  • Method and apparatus for closed-loop control of the electrode separation in a vacuum arc furnace

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Embodiment Construction

[0038] figure 1 The structure of the vacuum electric arc furnace 10 is schematically shown. The electric arc furnace 10 basically comprises a water-cooled furnace chamber 22 in which a melt 32 is accommodated. The height-variable electrode 30 can be immersed vertically into the melt by means of the electrode feed rod 20 and the electrode drive device 12 , or can be pulled upwards. By means of the X-Y alignment device 26 the horizontal position of the electrodes 30 can be aligned in the water-cooled furnace 22 . The sensor device 28 is capable of determining horizontal and vertical electrode positions. And detect the driving speed. The water-cooled furnace chamber 22 is placed under vacuum or low pressure by means of a vacuum generating device 24 , so that the electrode material can be melted into a melt 32 by the surrounding environment without contamination of the environment. The electrodes are energized by means of the power supply line 18 via the power supply unit 16 ,...

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Abstract

The invention relates to a method as well as a device for closed-loop control of the electrode gap in a vacuum arc furnace (10), wherein an electrode gap of a melting electrode from the surface of a melt material is subjected to closed-loop control as a function of a droplet short-circuit rate. For this purpose, a histogram (70) of detected droplet short-circuits (80) is created on the basis of at least one droplet short-circuit criterion (76), the histogram (70) is subdivided into sub-areas (72), a characteristic sub-area (74) of the histogram (70) is selected for closed-loop control purposes, and an electrode gap is subjected to closed-loop control on the basis of the droplet short-circuits (80) which can be associated with the selected sub-area (74).

Description

technical field [0001] The invention relates to a device and a method for closed-loop control of the electrode spacing in a vacuum electric arc furnace, wherein the electrode spacing of the melting electrode relative to the melt surface is controlled in a closed-loop manner as a function of the droplet short-circuit rate. Background technique [0002] A vacuum electric arc furnace is a secondary melting process for producing high quality metal feedstock with enhanced chemical and mechanical properties of the remelted material. The vacuum arc furnace method is used in particular for the production of materials for aircraft construction and for the fields of application in aerospace medicine and biomedicine. [0003] In a vacuum arc furnace, electrodes extend toward a crucible, and the electrodes are melted in a vacuum or low-pressure environment by applying a voltage between the electrodes and the crucible, where liquid material collects on the bottom of the crucible. Such e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B7/148
CPCH05B7/148H05B7/152Y02P10/25
Inventor 拉尔夫·厄勒哈拉尔德·斯科尔茨弗兰克-韦纳·霍夫曼
Owner ALD VACUUM TECH GMBH