JPS58126693A - Method of controlling continuous induction heating furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a continuous induction heating furnace that heats a piece of steel such as a billet by continuously passing through an induction heating coil, and the throughput of the induction heating furnace can be adjusted to a forging press line. In addition to synchronizing and controlling.

The purpose is to enable operation of the induction heating furnace with optimum power from the viewpoint of energy saving.

Conventional continuous induction heating furnaces are generally controlled by prospective operation, in which the voltage and conveyance speed are selected based on appropriate work standards, and the throughput of the material to be heated is manually set based on the operator's experience. It is determined by the work standards of the press line, etc.

Therefore, for example, for the same product, troubles occur on the forging press line due to mold adhesion, which reduces the throughput of the press line. If this occurs, either change the operator's settings (increase/decrease extraction pip, voltage) each time, or
Methods such as temporarily stopping extraction by keeping the fertilizer warm are used instead of changing the fertilizer setting. However, the method that requires the operator to change the settings poses problems from the perspective of energy conservation, as it is difficult to operate at the optimal power level according to the amount of processing. It is extremely difficult to control the heating temperature so as to maintain the gradient, and as a result, there have been many cases of heated objects going out of line due to temperature problems when starting up the bed temperature. .

This invention was made to solve the above-mentioned conventional problems, and its feature is that the forging press is designed to prevent the throughput of the induction method from being excessive or insufficient relative to the throughput of the forging press line. The point is that the induction heating furnace is controlled in synchronization with the line throughput.

That is, the present invention is a method for controlling heating of a continuous induction heating coil that heats an object by continuously passing it through an induction heating coil, with a throughput that is synchronized with that of a forging press line. The passing pitch of the heated object at each part is detected by the detectors installed on the inlet and outlet sides of each 1i equipment to detect the passing pitch of the heated object and input it into the computer. The computer calculates the optimum throughput of the press line by comparing it with the set pitch, and then adds press line information based on the operator's judgment, and allows the computer to determine the optimum throughput of the press line.The material to be heated is extracted using the optimum throughput determined by the computer. This is a continuous induction heating furnace control method characterized by controlling the extraction pitch of the induction heating furnace and the voltage of the heating coil so that the temperature of the induction heating furnace increases.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, in Figure 1, (1) is a continuous four-conduction S furnace consisting of a plurality of wire groove heating coils, (2) is an insertion pusher,
(V+) to (■,) are the power supply devices of each heating coil, (RR
-1) (RR-2) is the register use roll, (3) to (6
) indicates a forging press, (3) indicates a preforming press, and (4) indicates a forging press.
) is a forming press, (6) is a deburring press, (6) is a finishing press, and (7) is one control panel for each press line equipment.

(Ll) to (L,) are horizontal detectors (hereinafter abbreviated as passage detectors) for ensuring the passage of the heated material, and (8) is a computer.

(9) indicates each equipment operation panel.

The Koki continuous induction heating furnace (1) usually has 25 to 25 materials to be heated.
There are 30 people, and one is extracted every 14 to 20 seconds. In addition, in the forging press line, the forming press (
4) is the main reason; if the stamping continues for a long time, the material will adhere to the mold and take time to separate, causing fluctuations in the throughput of the press lie. In addition to the above-mentioned mold adhesion, causes of variations in the throughput of the press line include troubles such as failure of the press machine itself and malfunction of the manipulator. A limit switch, a phototube, or the like can be used as the passage detector for the heated material, and this detector detects the passing pitch of the heated material and inputs it to the computer (8). The computer (8) compares and calculates the detection signals of the passage detectors (Ll) to (L,) with pre-stored setting pitches, and also adds information from the operator to determine the optimum throughput of the induction heating furnace. Induction heating furnace (1)
insertion pusher (2) and the power supply (v
It has the function of controlling 1) to (3).

That is, the above device captures the state of material passing through each equipment of the press line into the computer (8) using the passage detectors (Ll) to (L,), and calculates the state of the press line (
In addition to monitoring the status (normality, abnormality), in parallel, each equipment operation a
1 (9) to the computer (8) and taken in through the passage detection 11 (Ll) to (L,), based on the movement of the heated material and the equipment trouble situation due to the operator breaking the fence, Determine the optimal throughput of the induction heating furnace (1), control the operation timing of the insertion pusher (2) according to the optimal throughput, and change the round power output that changes the power to each heating coil. It is a method.

In the above device, for example, if the material adheres closely to the mold in the molding press (4) of the press line and takes time to separate, the passage detector (L4) installed at the entrance and exit sides of the molding press ) (L5), the computer (8) compares and calculates the passing pitch indicating the abnormality with a previously stored set pitch. At this time, the operator assumes that the production standard of the ml molding press is 100 inches, and calculates the molding status of the molding press, that is, the line throughput, using a computer ( 8).

The computer determines the throughput of the induction heating furnace based on the difference between the passing pitch and the set pitch and the line throughput manually input by the operator, and inserts the material to be heated so that the material to be heated is extracted at the optimum throughput. Pusher (2) IIL
! At the same time as controlling one operation time, the electric power i1 of each heating coil is
! Control/control the li device to change the power output.

That is, when the passing pitch is slower than the set pitch, the extraction pitch of the induction heating furnace (1) is delayed, and when the passing pitch is faster than the set pitch, the extraction pitch is made faster. Furthermore, power distribution to each heating coil is controlled by outputting data based on learning of the optimum power distribution for a given amount of processing. The output of each arbitrary process is calculated by linear approximation as shown in FIG.

In addition, for example, if a failure occurs in the cash register roll (RR-1) and it becomes impossible to roll, the signal from the passage detector (L,) installed on the outlet side of the register roll (RR-1) will be transmitted to the computer ( 8), the computer performs a heat retention output after the set pitch + extraction pitch, but in parallel with this, the abnormality information of the register use roll input by the operator causes each power supply unit of the induction heating furnace (1) to be output. A command is sent to the unit to keep it warm, stop operation, or in some cases disable keeping it warm.

As explained above, according to the present invention, the throughput of the induction heating furnace (extraction pitch) can be synchronized with the throughput of the press line so that it is neither excessive nor insufficient with respect to the throughput of the forging press line. Therefore, the induction heating furnace can be operated efficiently, and the I
& Heating can be controlled with appropriate power, and energy savings can be expected.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention. FIG. 2 is a chart showing the relationship between the line processor and the control output voltage in the same as above. In the figure, 1... induction heating furnace, 2... insertion pusher,
3... Preforming press, 4... Molding press, 5...
・Deburring press, 6... Finishing press, 7...
Press line equipment control panel, 8... computer,
9... Each equipment operation panel. ■1~v3... Heating coil power supply device L1~L7...
Passage detector. Applicant: Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] A continuous induction heating furnace that heats the heated object by passing it through a wire groove heating coil continuously is used as a forging press line [a method of controlling heating according to the intended throughput, and each equipment of the forging press line Heated object passage aI provided on the inlet and outlet sides of
The recognition detector detects the passing pitch of the object to be heated at each location and inputs it into the computer, and the passing pitch is compared with a set pitch stored in the computer in advance, and further based on the operator's judgment. The computer determines the optimum throughput of the induction heating furnace by adding press line information, and adjusts the extraction pitch of the induction heating furnace and the voltage of the heating coil so that the material to be heated is extracted at the optimum throughput determined by the computer. A method for controlling a continuous induction heating furnace, characterized by controlling.