JPS59157986A - Induction heater - 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 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 filed another patent application (as shown in FIG. It is equipped with a speed setter 5 that generates a rotation speed command signal for a motor tag for driving a press, and the rotation speed command signal is also sent in parallel from the speed setter j to a converter t.

This converter 6 converts the rotational speed command signal into a conveying speed signal corresponding to the heating processing amount corresponding to the pressing processing amount of the press device 3. This conveying speed signal is used to control the pinch rollers via the drive motor 7. The press is rotated in synchronization with the press equipment. Further, the actual speed of the pinch roller g is detected by a speed detector D, and this actual speed is detected by a predetermined function generator I.
Inverter 11 is controlled via Q', and an output voltage commensurate with the actual speed is generated from inverter 1/, thereby eliminating the inconveniences associated with synchronous operation. Note that 7.2 is a power receiving board connected to a commercial frequency power source, and 13 is a transformer that steps up and down the output power from the power receiving board and sends it to the inverter. In this way, synchronization is achieved and the heating temperature of the heated material is kept constant.

Although the intended purpose can be achieved even with such synchronized operation of the induction heating device, 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 “shank” in order to eliminate it.

The present invention has been made for the purpose of addressing these conventional needs, 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 synchronously combined with a press device in a subsequent process: a stocker capable of storing at least one or more materials to be heated;
A sensor that detects and generates an output signal only while a predetermined number or more of the material to be heated is stored in the stocker; and a sensor that detects this and generates an output signal; and a standby state in which the heating machine is stopped for a short time or in a slow speed state based on the output signal. The present invention has a configuration characterized in that it includes: means for causing 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 now be described in accordance with preferred embodiments thereof as shown in the accompanying drawings.

FIG. 2 is a schematic diagram showing an embodiment of the induction heating device according to the present invention. 1S is a skid rail for sending the heating material downward; 1S is a stocker for receiving the material 3 to be heated that falls through the inclined shoe part of the skid rail/4'; 16 is a stocker for receiving the material 3 to be heated in the stocker ls; When more than a predetermined number of are stored,
a sensor that detects this and generates an output signal, and/or
7 is a device for taking out the material to be heated from the stocker lj. The heating coil 1 and the pinch roller g that constitutes the heated material conveying mechanism constitute a heating machine.

In Figure 2, the material to be heated is sent to the heating coil L by a pinch roller, heated to a predetermined temperature, and then passed through the inclined chute of the skid rail 4' to the stocker/
I can't send it to S. In the stocker 15, at least one heated material λ is stored. The material to be heated λ that has not been sent via the stocker/left to the take-out device 17-\ is taken out by the take-out device/7 in accordance with an electrical signal from a press device or the like in a subsequent process.

Now, if the throughput of the press device and the heating machine are completely synchronized, the number of heated materials 2 stored in the stocker is always the same number. A sensor 14 is provided in the stocker for detecting excess heated materials when the number of stored materials exceeds the necessary number.

Even though the press machine operates thousands of times, it actually speeds up or slows down by seven times. In this case, the heat treatment speed, that is, the conveyance speed of the pinch rollers is adjusted 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 step can be done automatically or manually. Therefore, for example, assuming 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 should be set to at least 4θ0/times the steady speed. Become.

Now, if the press equipment operates under the above assumption, the stocker l
The heated materials exceeding a predetermined number are stored in S at a rate of 7 out of 7000 and are detected by the sensor 16. When the sensor 16 performs a detection operation, the output signal is sent to the drive motor 7 (see the figure) of the pinch roller g to stop the conveyance speed for a short time or operate it at a very low speed. ) Applied voltage also speed detector? Since the output of (Fig. 1) is zero, the output becomes zero accordingly, and the heating machine is placed 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 in the heating coil l do not change due to heat dissipation while the heating machine is stopped. For example, the outlet temperature of heating coil l is g
In the warm forging range such as oo℃, the press working cycle is io
There is no problem until about seconds.

The exit temperature of the heating coil is t, 2! ;In hot forging at temperatures such as 0℃, if the heating machine is completely stopped, the temperature will drop quickly due to heat radiation from the heated material, which is heated to over 1000℃, so it is better to wait for the heating machine during slow production. is preferred.

In other words, both the transport speed and the applied voltage are reduced to about 60% of the predetermined amount of heat treatment, and the transport speed is shifted to the lowest transport speed that can maintain the temperature increase characteristic, and the film is placed on standby. However, in this case, stocker t! The heated material stored in excess rVc is not necessarily removed in the next press cycle of the press device, but is removed after several cycles have passed.

As explained above, according to the induction heating device according to the present invention, the actual processing amount of the press device and the processing @ of the heating machine can be completely synchronized, so there is no discrepancy between the set value and reality. Reliability has improved in automation of heating and press lines. Moreover, even if the conveyance speed of the heating machine is roughly set, synchronization can be easily realized as long as the condition that the conveyance speed is greater than the press processing amount is satisfied, which is a unique effect not seen in the past.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an induction heating device according to the present inventor that realizes synchronized operation, and Fig. 2 is a schematic diagram showing a preferred embodiment of the induction heating device according to the present invention, which is a further improvement of the induction heating device of Fig. 1. , is. /... Heating coil, λ... Heated material, 3... Press ae
-g -・Pinch roller-1l left・・Stocker, /6・
·sensor. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (1)

[Claims] Removal force 11 Including a heating machine that conveys the heated material and heat-processes it through a heating coil, and by an induction heating device combined in synchronization with a press device in the subsequent process: at least one or more objects. A stocker capable of storing heating materials: a sensor that detects this and generates an output signal only while a predetermined number or more of the heating materials are stored in the nuclear stocker; 1. An induction heating device characterized by comprising: a means for causing the device to stand by in a stopped state or a slow speed state for a short period of time.