Vacuum arc remelting process melting speed control method based on online simulation model

A technology of vacuum arc remelting and melting speed, which is applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of ingot current loss, achieve melting speed optimization, realize stable control, and ensure effective sexual effect

Active Publication Date: 2022-01-14
宝武特种冶金有限公司
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Problems solved by technology

There are significant losses in current into the ingot due to arcing / discharge between moulds.

Method used

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  • Vacuum arc remelting process melting speed control method based on online simulation model
  • Vacuum arc remelting process melting speed control method based on online simulation model
  • Vacuum arc remelting process melting speed control method based on online simulation model

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Embodiment Construction

[0154] see figure 1 , the vacuum arc remelting process melting speed control method based on the online simulation model of the present invention, comprises the following steps:

[0155] 1) start

[0156] At the moment δt before the start of smelting, t=-δt;

[0157] Calculation control stage: n=0;

[0158] 2) Calculation of heating power in the arc area

[0159] Calculation control stage: n=n+1;

[0160] Using the detected voltage and current, using the potential equation, the arc area is equivalent to a uniform resistance, and the potential distribution calculation of the whole area (including: electrode, arc, ingot, casting mold, vacuum area, ingot / mold gap) is performed. , until the calculation converges. The potential equation is as follows:

[0161]

[0162] In the formula is the potential (V); x, r are the vertical and radial coordinates (m) respectively. Calculations are performed by discrete difference equations combined with boundary conditions. Using th...

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Abstract

The invention provides a vacuum arc remelting process melting speed control method based on an online simulation model. The method comprises the steps of: acquiring the depth of a molten pool and a melting speed matched with the depth of the target molten pool through heat transfer calculation of an ingot casting area; determining melting parameters matched with the melting speed, conducting electrode heat transfer melting calculation through an electrode area heat transfer equation in combination with the electric arc heat transfer efficiency obtained through the measured voltage, current and melting speed information, and acquiring voltage and current parameter values matched with the target melting speed; realizing the target of more visual molten pool depth parameter control, and acquiring the target melting speed and voltage and current set values of the target molten pool depth through the combination of electrode and ingot casting area heat transfer calculation. Through effective combination of model calculation, the melting speed measured in real time and melting voltage and current information, the changing characteristic parameter values used for model prediction calculation in real time are dynamically determined, thus guaranteeing the effectiveness of model real-time dynamic prediction, and meeting the precision requirement of whole-process control.

Description

technical field [0001] The invention belongs to the vacuum arc remelting technology, in particular to a method for controlling the melting speed of the vacuum arc remelting process based on an online simulation model. Background technique [0002] Vacuum arc remelting (vacuum arc remelting, vacuum arc remelting) is an important method of special melting process, which is widely used in the melting of segregation-sensitive alloy materials, and is one of the few recognized high-quality, non-segregation-free aerospace rotating parts alloy ingots manufacturing method. The pre-made alloy rod that meets the basic composition requirements of the product is used as the consumable electrode, and a DC arc is introduced through the consumable electrode as a heat source under vacuum conditions to melt the electrode, and the melted droplets solidify in the water-cooled mold to form a dense Ingots with directional solidification characteristics (such as figure 1 shown). The vacuum arc ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042Y02P10/25
Inventor 李青许正芳谢树元
Owner 宝武特种冶金有限公司
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