JPS633426B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating device, and more particularly to an improvement in an induction heating device that is synchronously combined with a press device to constitute a heating/pressing line.

Conventionally, the throughput of a forging press apparatus and a heating machine equipped with a heating coil and a heated material conveying mechanism have been set separately and synchronized manually.
However, in recent years, automation of press equipment has progressed, and there is a strong desire to realize an unmanned induction heating apparatus by synchronizing the press equipment and the heating material.

In order to answer this, the present inventor disclosed such a synchronization invention in another patent application (Japanese Patent Application No. Sho-1). Specifically, as shown in FIG. 1, the rotation of the press drive motor 4 corresponds to a predetermined press processing amount of the press device 3 that presses the heated material 2 heated by the heating coil 1. It is equipped with a speed setter 5 that generates a speed command signal, and rotational speed command signals are also sent in parallel from the speed setter 5 to a converter 6. This converter 6 converts the rotational speed command signal into a conveyance speed signal corresponding to the heat processing amount corresponding to the press throughput of the press device 3. This conveyance speed signal is used to drive the pinch roller 8 via the drive motor 7. are rotated synchronously with the press equipment. Further, the actual speed of the pinch roller 8 is detected by the speed detector 9, and this actual speed is used to control the inverter 11 via the predetermined function generator 10, so that an output voltage commensurate with the actual speed is generated from the inverter 11. This eliminates the inconveniences associated with synchronous operation. Note that 12 is a power receiving board connected to a commercial frequency power supply, and 13 is a transformer that steps up and down the output power from the power receiving board and sends it to the inverter 11.
In this way, synchronization is achieved and the heating temperature of the heated material 2 is kept constant.

Although the intended purpose can be achieved even with such synchronized operation of the induction heating equipment, the amount of processing set by the speed setting device and the amount of processing actually performed during operation may become ``discrepant'' as the operation continues. Therefore, it is necessary to automatically correct this "shift" in order to eliminate it.

The present invention was made with the purpose of addressing such a conventional need, and in order to achieve this purpose, the induction heating device according to the present invention conveys a material to be heated and passes it through a heating coil. In an induction heating device that includes heating for heat treatment and is combined in synchronization with a press device in a subsequent process, a stocker capable of storing at least one material to be heated, and a predetermined number or more of the materials to be heated in the stocker. A configuration characterized by comprising a sensor that detects this and generates an output signal only while it is being stored, and a means for causing the heating machine to stand by for a short time in a stopped state or a slow speed state based on the output signal. have. That is,
In the present invention, when automatically synchronized operation is performed, the actual number of heated materials to be processed is corrected according to the performance of the press apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to preferred embodiments thereof shown in the accompanying drawings.

FIG. 2 is a schematic diagram showing an embodiment of the induction heating device according to the present invention. In the figure, 1 is a heating coil, 2 is a heated material, 8 is a pinch roller, and 14 is a heating coil 1 to a heated material 2. 15 is a stocker for receiving the heated material 3 falling through the inclined shudder portion of the skid rail 14; 16 is a stocker 16 when a predetermined number or more of the heated material 3 is stored in the stocker 15; A sensor detects this and generates an output signal, and 17 is a device for taking out the heated material 2 from the stocker 15. Note that the heating coil 1 and the pinch roller 8 that constitutes the heated material conveyance mechanism constitute a heating machine.

In FIG. 2, the heated material 2 is sent to the heating coil 1 by a pinch roller, heated to a predetermined temperature, and then passed through the inclined chute portion of the skid rail 14 and sent to the stocker 15. Stotsuka 15
In this case, at least one heated material 2 is stored. The heated material 2 sent to the take-out device 17 via the stocker 15 is taken out by the take-out device 17 in accordance with an electrical signal from a press device or the like in a subsequent process.

Now, if the throughputs of the press device and the heating machine are completely synchronized, the number of heated materials 2 stored in the stocker 15 will always be the same. A sensor 16 is provided at the upper part of the stocker 15 to detect the excess heated material 2 when the number of heated materials 2 exceeds the required number.

Over the course of thousands of operations, the press actually speeds up or slows down by one unit. In this case, the heat treatment speed, i.e. the pinch roller 8
Adjust the conveyance speed to the upper limit of the variation in the operation of the press device. In this setting method, a value that takes into account variations in the setting signal of the press device (see FIG. 1) may be converted into a conveying speed setting signal. This can be done automatically or manually. Therefore, for example, if it is assumed that the press machine presses 1000 times and the operation speeds up or slows down by one piece, the conveyance speed of the heated material 2 should be set at least 1001 times the steady speed. Become.

Now, when the press device operates under the above assumption, the stocker 15 stores more than a predetermined number of materials 2 to be heated at a rate of 1 in 1000, and is detected by the sensor 16. When the sensor 16 performs a detection operation,
The output signal is sent to the drive motor 7 of the pinch roller 8.
(Fig. 1), the conveyance speed is stopped for a short time or is operated at a slow speed, and at the same time, the voltage applied to the heating coil 1 (from the inverter) is also controlled by the speed detector 9 (first
Since the output of (Fig.) is zero, the output becomes zero and the heating machine is put on standby. Thereafter, when the sensor 6 detects that there is no excess material to be heated, the heating machine is returned to this operation.

The method of completely stopping the heating machine and waiting can be used in a region where the temperature increase characteristics within the heating coil 1 do not change due to heat radiation while the heating machine is stopped. For example, in a warm forging region where the exit temperature of the heating coil 1 is 800° C., there is no problem until the press working cycle is about 10 seconds.

In hot forging where the exit temperature of the heating coil 1 is 1250℃, etc., if the heating machine is completely stopped, the temperature will drop quickly due to heat radiation from the material 2 heated to 1200℃ or higher, so the heating machine should be on standby. It is preferable to use slow speed feeding. That is, approximately 60% of the predetermined heat treatment amount.
Both the transport speed and the applied voltage are lowered to about 10%, and the transport speed is shifted to the lowest transport speed that can maintain the temperature increase characteristics, and then the temperature rise characteristic is maintained. However, in this case, the excess heated material 2 stored in the stocker 15 will not be removed in the next press cycle of the press device, but will be removed after several cycles have passed.

As explained above, according to the induction heating device according to the present invention, the actual throughput of the press device and the throughput of the heating machine can be completely synchronized, so there is no discrepancy between the set value and reality. Improved reliability in automation of heating and press lines. Further, even if the conveying speed of the heating machine is roughly set, synchronization can be easily achieved as long as the condition is that it is greater than the press throughput, which is a unique effect not seen in the past.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a preferred embodiment of an induction heating device according to the present invention, which is a further improvement of the induction heating device of FIG. , is. 1...Heating coil, 2...Heated material, 3...Press device, 8...Pinch roller, 15...Stocker, 16...Sensor. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In an induction heating device that includes a heating machine that conveys the material to be heated and heats it through a heating coil, and is combined in synchronization with a press device in the subsequent process,
a stocker capable of storing at least one heated material; a sensor that detects the heated material and generates an output signal only while a predetermined number or more of the heated material is stored in the stocker; An induction heating apparatus characterized by comprising means for causing the heating machine to stand by in a short-time stopped state or a slow speed state.