JPS6313315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating device, and particularly to an induction heating device incorporating a press device.

In the conventional induction heating apparatus, once the incorporated press device and induction heating machine are preset, the press processing amount and heat processing amount hardly change, so there is no need to specifically link each of them. However, recently, press machines have been automated, and as automation of the entire press machine line has progressed, it has become necessary to link the press machine and the induction heating machine.

The present invention was made for the purpose of addressing such a need, and the induction heating device according to the present invention includes a press device that presses a heated material heated by an induction heating coil, and a press device that presses a heated material heated by an induction heating coil, and a a speed setting means for generating a rotation speed command signal for a press drive motor corresponding to a predetermined press throughput; and a conveying speed of the heated material responsive to the rotation speed command signal and corresponding to the press throughput in synchronization with the press throughput. exchanging means for generating a signal; means for detecting the actual conveying speed of the heated material conveyed via the pinch rollers based on the conveying speed signal; and means for adjusting the actual conveying speed using a predetermined function. and means for applying an output voltage to the induction heating coil.

Further, the induction heating apparatus according to the present invention includes a press device for pressing a material to be heated heated by an induction heating coil, a means for calculating a conveyance speed of the material to be heated from an operation signal of the press device, and a means for calculating a conveyance speed of the material to be heated from an operation signal of the press device; means for detecting the actual conveying speed of the heated material conveyed via the pinch rollers based on a speed signal, and applying an output voltage corresponding to the actual conveying speed to the induction heating coil using a predetermined function. It also has a configuration characterized by comprising means.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

The drawing is a schematic diagram showing an embodiment of the induction heating device according to the present invention, in which 1 is a power receiving board, 2 is a transformer, 3 is an inverter connected in series to the power receiving board 1 and the transformer 2, 4 is a capacitor, Reference numeral 5 denotes an induction heating coil that heats a material to be heated (not shown) using a high frequency voltage from the inverter 3. Reference numeral 6 denotes a press device for pressing the heat-treated material to be heated, 7 a drive motor for press processing, 8 a speed setting device for setting the speed of the drive motor 7 corresponding to a predetermined press throughput of the press device 6; 9 is an amplifier, 10 is a converter connected to the output terminal of the amplifier 9 together with the drive motor 7, 11 is a pinch roller drive motor connected to the converter 10, and 12 is a pinch roller that conveys the material to be heated. Furthermore, 13 is a speed detector (tachogenerator) coupled to the pinch roller, 14
is a function generator connected to the speed detector 13, which controls the output voltage of the inverter 3.

Next, the operation shown in the figure will be explained.

First, a power receiving board 1 receives commercial frequency power, a transformer 2 steps down or steps up the voltage to the required voltage, an inverter 3 converts it to the high frequency necessary for induction heating, and supplies the optimum frequency power to the heating coil 5. , the material to be heated passing through the induction heating coil 5 is heated by induction. The material to be heated is continuously passed through the coil 5 by the pinch roller 12.
After being heated by a coil 5, it is sent to a press device 6 and formed into a predetermined forged product. now,
The throughput of the press device 6 is determined by setting the rotational speed of the drive motor 7 with a speed setting device 8. This speed setting device 8 may be a manual setting device or an automatic setting device such as a computer. The speed setting signal from the speed setting device 8 is sent to the drive motor 7 via the amplifier 9, and at the same time is sent to the pinch roller drive motor 11 via the converter 10 to rotate the pinch roller and convey the material to be heated. . Here, the converter 10 includes an amplifier 9 so that the amount of press processing by the press device 6 and the amount of heat processing by a heating machine equipped with an induction heating coil 5, a motor 11, etc. are the same.
This converts the speed setting signal from the Therefore, if the press processing amount is set, the heat processing amount will also be automatically synchronized to be the same.

Now, when the amount of press processing and the amount of heat processing are synchronized as described above, if the input voltage of the coil 5 is constant, the heating temperature of the material to be heated will vary in inverse proportion to the amount of heat processing. Therefore, it is necessary to detect the conveyance speed of the material to be heated, that is, the rotational speed of the pinch roller 12 with the speed detector 11, and input a voltage to the coil 5 that corresponds to the conveyance speed.

Now, if the output voltage of the inverter 3 is V ₀ and a predetermined heating temperature can be obtained when the transport speed is S ₀ , then when the transport speed is converted to S', the voltage V as shown in the following equation (1) is obtained. ' must be applied to the coil 5.

Here, α is a heat dissipation constant determined by the thickness of the material to be heated, the heating temperature, the size of the coil, etc.

Therefore, the actual transport speed detected by the speed detector 13 is corrected by the function generator 14 based on equation (1),
Thereby, by controlling the output voltage of the inverter 3, it is possible to keep the heating temperature of the heated material constant even if the press processing amount fluctuates.

In the above embodiment, the speed of the press device 6 is set by the speed setting device 8, but the system detects the operation signal of the press device 6 and automatically calculates and determines the conveyance speed of the heated material. can also be considered. for example,
The length of the material to be heated is input into a well-known calculation device (not shown), and when an operation signal of the press device is sent to the calculation device, the operation time of one cycle can be calculated. Therefore, the conveying speed in the coil 5 can be determined by dividing the length of the material being heated by the operating time of one cycle. In this case, by sending the speed command to the motor 11, synchronization can be performed even if the speed of the press device 6 is unknown.

As described above, according to the induction heating device according to the present invention, the press mechanism and the heating mechanism can be synchronized, and the heating temperature of the heating coil can be controlled correspondingly, so that the press line can be controlled. The effect is that automation becomes easier.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing a preferred embodiment of the induction heating device according to the present invention. 3... Inverter, 5... Induction heating coil, 6
... Press device, 7 ... Drive motor, 8 ... Speed setter, 10 ... Converter, 11 ... Pinch roller drive motor, 12 ... Pinch roller, 13 ... Speed detector, 14 ... Function generation vessel.

Claims (1)

[Claims] 1. A press device that presses a material to be heated heated by an induction heating coil, and a speed at which a rotation speed command signal of a press drive motor corresponding to a predetermined press processing amount of the press device is generated. a setting means;
exchanging means for generating a conveyance speed signal for the heated material in response to the rotational speed command signal and in synchronization with the press processing amount; An induction heating apparatus comprising: means for detecting the actual conveyance speed of the material; and means for applying an output voltage commensurate with the actual conveyance speed to the induction heating coil using a predetermined function. 2. A press device that presses a material to be heated heated by an induction heating coil, a means for calculating a conveyance speed of the material to be heated from an operation signal of the press device, and a means for calculating a conveyance speed of the material to be heated from an operation signal of the press device; and means for applying an output voltage commensurate with the actual conveyance speed to the induction heating coil using a predetermined function. induction heating device.