JPS62286663A - Controlling method for automatic pouring furnace - Google Patents

Abstract

PURPOSE:To exactly maintain the pouring rate to a casting mold even if the diameter of a pouring nozzle of a pressurization type pouring furnace changes because of the wear, etc., thereof by controlling the air pressure to the pouring furnace or the tilting angle of the furnace body in such a manner that the tapping speed decreases according to the pouring rate of the remaining molten metal. CONSTITUTION:The detection signal of a molten metal level is compared with the signal of a reference level by a reference level setting part 6 when the pouring rate is set at, for example, 100 by a pouring setting part 1. The signal which is 0 pouring rate is delivered from an arithmetic part 7 for the tapping rate to a signal adder 2 and the signal which indicates 100 pouring rate is inputted from an arithmetic part 3 for air by the signal addition in the adder 2. On the other hand, the air pressure to attain the pouring speed adequate for 100 tapping rate is fed to the pressurization type pouring furnace 4 from the arithmetic part 3 so that the molten metal is tapped. The molten metal level in a sprue 5a of the casting mold 5 is raised by such tapping. A signal to indicate the pouring rate 80 of the remaining molten metal is outputted from the adder 2 when the signal indicating 20 tapping rate is outputted from an arithmetic part 7. As a result, the signal indicating tapping rate 100 is inputted to the arithmetic part 3.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for controlling an automated pouring furnace that automates pouring work in a foundry.

[Prior Art 1] This type of automatic pouring furnace includes an electromagnetic pump type, a stopper set, a pressurized pouring type, etc., but the pouring speed is either fixed or changes in a stepwise pattern.

[Problems to be Solved by the Invention] However, there are changes inherent to the pouring furnace over time due to wear of the pouring nozzle or slag adhesion, etc., and this causes changes in the pouring speed and causes errors in pouring accuracy. There was a drawback.

[Means for Solving the Problem 1] The method for controlling an automatic pouring furnace of the present invention is a method for automatically pouring metal into a mold using a pouring furnace, the pouring amount setting the amount of metal poured into the mold. setting means, and l) pouring amount calculation means for calculating the amount of metal poured into the mold by detecting the molten metal level in the mold;
a pouring amount subtracting means for subtracting the pouring amount from the pouring calculation means from the pouring amount by the pouring amount setting means; and a pouring rate set in advance to be appropriate in response to a signal from the pouring amount subtracting means. and a pouring speed setting means for setting the air pressure or tilting angle (above) to the melt furnace.

[Effect 1] According to the above method, since the pouring subtraction means outputs a signal indicating the remaining pouring amount to the mold, the pneumatic pressure calculation means decreases the pouring speed as the remaining pouring amount decreases. The air pressure to the pouring furnace or the tilting angle of the pouring furnace is set so that

Embodiment 1 FIG. 1 shows an embodiment of a system to which the automatic pouring furnace control method of the present invention is applied.

Reference numeral 1 denotes a pouring amount setting section for setting the pouring amount, and the set pouring amount is input to the adding section of the signal adder 2. 3
is an air pressure calculation unit that calculates the air pressure to the molten metal surface of the pressurized pouring furnace 4 in the latter stage. Correspondingly, the air pressure is tabulated in advance as data. 5
is a mold that receives molten metal from a pressurized pouring furnace.
Reference numeral 6 denotes a level sensor that detects the molten metal level in the sprue cup 5a of the mold 5. Reference numeral 1 denotes a discharge amount calculating section, which calculates the amount of hot water dispensed into the mold 5 by comparing the detection signal from the level sensor 6 and the reference level of the mold 5 determined by the reference level setting section 8.

A signal indicating the amount of molten metal dispensed is input to the subtraction section of the signal adder 2, and the amount of molten metal poured into the mold 5 is subtracted from the amount of molten metal poured by the molten metal pouring amount setting section 1. Therefore, the signal adder 2 outputs a signal indicating the remaining amount until the amount of molten metal poured into the mold 5 is initially set by the pouring amount setting section 1 into the mold 5.

Next, control operations in the above system will be explained.

For example, the pouring amount is set to “100” by the pouring amount setting part 1.
Suppose you set it to . At this time, the detection signal of the hot water level by the level sensor 6 or the base level by the reference level setting section 8 is detected. (1
- A signal that is 111 or 0 is sent from the hot water output calculation unit 7 to the signal adder 2. As a result, by the signal addition of the signal adder 2, A signal indicating the pouring amount 10() is manually inputted to the air pressure calculation unit 3.

From the air pressure calculation unit 3, an air pressure P 100, which is an appropriate pouring rate for the pouring amount i (, 10), is sent to the pressurized pouring furnace (2), and the metal is poured at this pouring rate.

Assume that due to such tapping, the level of molten metal at the sprue 5a of the mold 5 rises by 2,000 yen, and a signal indicating the amount of tapped metal 20 is output from the pouring amount display section 7. At this time, the signal addition section 2 outputs a signal indicating the remaining amount of poured molten metal 80. Based on this 1%, the pneumatic pressure calculation unit 3 has a pouring amount of 8 by the calculation of the signal adder 2.
A signal indicating 0 is input. The air pressure calculation unit 3 calculates the air pressure P such that the pouring speed is appropriate for the remaining pouring amount 80.
0 is output. This air pressure P so is the air pressure P
1110, and the air pressure is controlled so that the dispensing speed is slowed in accordance with the amount of remaining poured molten metal, so that molten metal can be poured accurately without exceeding or insufficient the amount set by the pouring amount setting section 1.

Note that when detecting the level of the molten metal in the mold 5, if the molten metal surface is undulating due to pouring, the level detection tends to become unstable. Therefore, as shown in FIG.
] If the molten metal surface is wavy, the molten metal level can be detected step by step. Even in such cases, stable level detection can be obtained due to the characteristics of the sensor, since it can be detected using a stepped area.

Although a pressurized pouring furnace was used in the two-part embodiment, the tilting angle of the tilting pouring furnace may be changed depending on the pouring speed.

[Effect of the invention 1] As explained above, the air pressure to the pressurized pouring furnace or the tilting angle of the furnace body is controlled so that the tapping speed is slowed in response to the remaining pouring condition. Even if the diameter of the nozzle changes due to wear or adhesion of slabs to the 7 nozzles of the furnace, it is possible to accurately pour out the set amount of molten metal by sealing it in the mold.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control section to which the automatic pouring furnace control method of the present invention is applied, and FIG. 2 is a sectional view showing a modification of the mold in FIG. 1. 1...Pouring amount setting section, 2...Signal adder, 3...
Pneumatic calculation unit,... [... Pressurized pouring furnace, 5... Mold, 5a...) Easy level sound, 5)]... Staircase sound, 6... Level sensor, 7 ...Hot water output calculation section,...Standard level setting section. Patent Applicant Fuji Electric Co., Ltd. Agent Patent Attorney Seihaku Ao Gai 28 Feng 1 Zukan 2 Goose

Claims (1)

[Claims] (1) A method of automatically pouring metal into a mold using a pouring furnace,
a molten metal pouring amount setting means for setting the amount of molten metal poured into the mold; a molten metal pouring amount calculation means for calculating the amount of molten metal poured into the mold by detecting the molten metal level in the mold; A pouring amount subtracting means for subtracting the pouring amount; and a pouring speed for setting the pouring furnace at a preset air pressure or tilt angle so as to achieve an appropriate pouring speed in response to a signal from the pouring amount subtracting means. 1. A method for controlling an automatic pouring furnace, comprising: setting means.