Method for a pouring control and a storage medium for storing programs for causing a computer to carry out a process for controlling pouring

Patent metadata

Field	Value
Publication number	US-9975177-B2
Application number	US-201414785921-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Apr 27, 2013
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

To enable a ladle-tilting automatic pouring device to take less time for identification of the parameters and the device to pour highly precisely by sequentially updating pouring model parameters according to the pouring situation, the present pouring control method is based on a mathematical model of a process from input of control parameters to pouring of molten metal, the method including: identifying, using an optimization technique, a flow rate coefficient, a liquid density, and a pouring start angle that is a tilting angle of the pouring ladle when the flowing of the molten metal starts, which are the control parameters in the mathematical model, based on weight of liquid that flows out of the pouring ladle and tilting angle of the ladle that are measured during pouring, and a command signal that controls the tilting of the pouring ladle; and updating the control parameters to the identified control parameters.

First claim

The invention claimed is:

1. A pouring control method for controlling pouring based on a mathematical model of a pouring process from input of control parameters to pouring of molten metal using a pouring ladle in an automatic pouring device with a tilting pouring ladle that pours the molten metal into a mold by tilting the pouring ladle that holds the molten metal, comprising: identifying, using an optimization technique, a flow rate coefficient, a liquid density, and a pouring start angle that is a tilting angle of the pouring ladle at which a flow out of the molten metal starts, wherein the flow rate coefficient, the liquid density, and the pouring start angle are the control parameters in the mathematical model, based on weight of liquid that flows out of the pouring ladle and tilting angle of the ladle that are measured during pouring, and a command signal that controls the tilting of the pouring ladle, and
updating the control parameters to the identified control parameters,
wherein the flow rate coefficient the liquid density, and the pouring start angle are identified by optimizing an evaluation function that is represented by a following equation,
{ c id ,θ sid ,ρ id }=arg min{∫ 0 T ( W Lex ( t )− W Lsim ( t,c sim ,θ ssim ,ρ sim )) 2 dt+w 1 ( c avg −c sim ) 2 +w 2 (ρ avg −ρ sim ) 2 },

where c id is an identified flow rate coefficient, θ sid is an identified pouring start angle, ρ id is an identified liquid density, T is operating time required to pour molten metal into one mold, W Lex is data on outflow weight from the pouring ladle obtained from the automatic pouring device with a tilting-type ladle, W Lsim is outflow weight obtained by the simulation with the mathematical model using the lade tilting angle, c sim is a flow rate coefficient that was used in the simulation, θ ssim is a pouring start angle that was used in the simulation, ρ sim is a liquid density that was used in the simulation, C avg is an average value of flow rate coefficients used until previous time, ρ avg is an average value of liquid densities used until previous time, w 1 is a weight coefficient used to control the variation of the flow rate coefficient for every pouring, and w 2 is a weight coefficient used to control the variation of the liquid density for every pouring.

2. The pouring control method according to claim 1 , wherein the flow rate coefficient and the liquid density are identified and updated every time one pouring is completed, and wherein
an approximate function between the identified pouring start angle and a corresponding weight of liquid within the pouring ladle is calculated and updated after the consecutive pouring processes by the pouring ladle are completed.

3. The pouring control method according to claim 1 , wherein the optimization technique is a Down-hill simplex method.

4. The pouring control method according to claim 2 , wherein the optimization technique is a Down-hill simplex method.

Assignees

• National Univ Corporation Univ Of Yamanashi
• Sintokogio Ltd
• National Univ Corporation Toyohashi Univ Of Technology

Inventors

• Noda Yoshiyuki
• Tsuji Takaaki
• Suzuki Makio
• Terashima Kazuhiko

Classifications

• B22D39/00

  Equipment for supplying molten metal in rations · CPC title

• B22D41/06

  Equipment for tilting · CPC title

• B22D37/00 Primary

  Controlling or regulating the pouring of molten metal from a casting melt-holding vessel ({B22D11/18,} B22D39/00, B22D41/00 take precedence) · CPC title

• F27D3/14

  Charging or discharging liquid or molten material · CPC title

• F27D2019/0028

  Regulation · CPC title