JPH0688121A - Method for discharging material to be heated in induction heating apparatus and device therefor - Google Patents

Abstract

PURPOSE:To suppress the development of uneven temp. in material to be heated in an induction heating apparatus provided with discharging rollers. CONSTITUTION:In a method for discharging the material to be heated 12 from the induction heating apparatus 10, from which plural materials 12 to be heated are heated while continuously carrying by a feeding roller 20 having variable carrying speed and also, the heated material 12 after the heat treatment is forcedly discharged by a discharging roller 26 arranged at the outlet side part of an inductor 14, the feeding roller 20 is driven at high speed in the time zone from the outlet of the inductor 14 to biting completion into the discharging roller 26 within the cycle time needed for the following process. Then, in the remained time zone of the cycle time, the operation control repeating the drive at a low speed is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for discharging an object to be heated in an induction heating device, and more particularly to preventing uneven temperature distribution due to a decrease in the tip temperature of a heating material discharged by the induction heating device. Method and apparatus for doing

[0002]

2. Description of the Related Art In an induction heating apparatus for continuously heating an object to be heated, when the object to be heated is a long billet, the object to be heated is placed on the outlet side of the inductor in order to discharge the material from the inductor. A discharge pinch roller (hereinafter referred to as a discharge roller) for pulling out and discharging is provided.

Generally, in this type of long billet induction heating apparatus, heat insulation is not provided between the inductor outlet and the discharge roller. Therefore, when the transport speed is slow, the object to be heated is cooled by air between the inductor outlet and the discharge roller. Therefore, even if the object to be heated is averagely heated by the inductor as a whole, the leading end portion that begins to cool from the inductor and the trailing end portion that comes out from behind are inevitably equivalent to each other. There will be a temperature difference. Because of this temperature unevenness in the longitudinal direction, it adversely affects the next forging step such as pressing.

For this reason, the conventional induction heating apparatus is provided with a heated object detector between the outlet of the inductor and the discharge roller, and feeds when the tip of the heated object is detected by this detector. A method has been proposed in which the feed speed of the roller is increased, and the feeding speed of the feed roller of the object to be heated is increased for a certain period of time until the feed roller is rotated in advance at a high speed to prevent the temperature of the tip from decreasing. (Japanese Patent Publication Sho-37-599)
issue).

[0005]

However, in the above-mentioned conventional method, when the object to be heated is projected from the outlet of the inductor, it is uniformly conveyed at a high speed after being detected by the detector. There was a problem that the consistency of could not be obtained.

In view of the above-mentioned conventional problems, the present invention can suppress the occurrence of temperature unevenness in the longitudinal direction as much as possible when discharging the object to be heated, which has been subjected to the heat treatment, by the discharging roller, and supply it to the subsequent process. An object of the present invention is to provide a method and an apparatus for discharging an object to be heated of an induction heating device, which is capable of reducing the cycle time.

[0007]

In order to achieve the above object, a method of discharging an object to be heated of an induction heating device according to the present invention comprises:
A plurality of objects to be heated are heated while being continuously fed by a feed roller with a variable transport speed, and a discharge roller provided at an inductor outlet side forcibly discharges the object to be heated after the heating treatment. In the heating material discharge method, the feed roller is operated at a high speed during the time period from the exit of the inductor to the completion of biting into the discharge roller within the cycle time required for the subsequent process, and the remaining time of the cycle time is set. The heating target is repeatedly discharged at a low speed to discharge the object to be heated.

Further, the object-to-be-heated discharging device of the induction heating device according to the present invention includes a feed roller having a variable conveyance speed, which is provided at an inductor inlet portion of the induction heating device for continuously feeding and heating the object to be heated. , A high-speed discharge roller provided at the outlet side of the inductor, and is provided immediately downstream of the discharge roller with a heated object detection sensor and a timer for setting the cycle time required for the subsequent process. Having a control device for inputting these signals, the control device starts counting the cycle time by detecting the tip of the object to be heated by the sensor and operates the feed roller at a high speed, and then the object to be heated of the sensor. The initial operation to switch to low speed operation of the feed roller by the rear end detection
After that, in the cycle time time region, the feed roller was operated at a high speed during the time period until the tip of the object to be heated was detected, and the feed roller was operated at a low speed during the remaining time period. It is a thing.

[0009]

According to the above construction, the heated object which has been subjected to the heat treatment is discharged, and the first heated object immediately after the start of operation is bitten by the discharging roller at the standard conveying speed and then discharged at a high speed. Is from the start of cycle time counting until the tip of the heated object is detected by the sensor immediately after the discharge roller.
It is transported at high speed and thereafter at low speed until the cycle time is completed. As a result, it is possible to suppress the occurrence of temperature unevenness in the longitudinal direction of the object to be heated discharged from the outlet of the inductor as much as possible while maintaining the optimum supply cycle for the subsequent forging process and the like.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the method and apparatus for discharging an object to be heated of an induction heating device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an induction heating device.
The induction heating device 10 targets a long billet for heating, and a plurality of objects 12 to be heated are continuously heated by a heating inductor 14.
It is supposed to be carried inside. The heating inductor 14 is set to have a length sufficient to uniformly heat each of the loaded objects 12 to be heated. Further, a pair of pinch rollers 16A, 16A for carrying in the member to be heated 12 is provided at the entrance thereof.
B is installed, and a drive motor 18 is connected to this, so that the article to be heated 12 introduced can be bitten and forcibly delivered. Pinch roller 16A,
The feed roller 20 composed of 16B and the drive motor 18 has a variable conveyance speed, and the conveyance speed inside the inductor 14 can be arbitrarily changed. Also, the heating inductor 14
A pair of pinch rollers 22A, 22B for discharging the heated object 12 to be heated is installed at the outlet side of the heating target 24. The object 12 can be bitten and forcibly delivered to the subsequent forging step. The discharge roller 26 including the pinch rollers 22A and 22B and the drive motor 24 is capable of high-speed transport driving at a transport speed equal to or higher than that of the feed roller 20.

In the induction heating apparatus 10 as described above, in order to minimize the temperature unevenness of the object 12 to be discharged, the conveying speed of the object 12 to be heated is within the cycle time required in the subsequent step. Is changed from the outlet of the inductor 14 to the discharge roller 26 and other points. For this reason, first, a sensor 28 for detecting whether or not the article to be heated 12 is bitten and discharged from the discharge roller 26 is provided at the outlet portion of the discharge roller 26 immediately downstream. This is composed of an optical sensor including a light projector and a light receiver, and detects the front end portion or the rear end portion of the object to be heated 12 by an on / off operation accompanying the object 12 to be heated passing between them. Further, a control device 30 for inputting a detection signal from the sensor 28 is provided, which performs a predetermined calculation and outputs a drive control signal to the drive motor 18 of the feed roller 20. Further, the controller 30 includes a cycle timer 32.
The time set by is input. This timer 32 is for setting the discharge time interval of the article to be heated 12 discharged from the induction heating device 10, and the cycle time Ts required by the forging machine in the subsequent process is input and set. It is supposed to be output to 30.

The controller 30 controls the sensor 28 as described above.
And the state of the cycle timer 32 is read and the speed of the drive motor 18 of the feed roller 20 is changed, which is the cycle time T set by the cycle timer 30.
Within the range of s, the object to be heated 12 at the head is changed from the outlet of the inductor 14 to the discharge roller 26 in the remaining time zone other than that. First, the induction heating device 10 is operated at a normal conveying speed Vm, and the first heated member 1 is heated.
The tip of the sensor 2 bites into the discharge roller 26, and immediately after the sensor 2
8, the feed roller 20 is operated at a speed higher than the normal conveying speed Vm, and the high speed operation is continued until the sensor 28 detects the rear end of the first object 12 to be heated. After the trailing edge is detected, the speed of the feed roller 20 is switched to the speed Vl which is lower than the normal conveying speed, and this is continued until the cycle time is up.
After performing such an initial intermittent operation, the cycle timer 3
The cycle time according to 2 is counted, and the control device 30 instructs the feed roller 20 to operate at high speed until the tip of the subsequent article to be heated 12 is detected by the sensor 28. It is supposed to control so as to switch. In this case, the high speed Vh of the drive motor 18 is a fixed value determined by the motor performance. Further, since the cycle time Ts and the average conveyance speed Vm are uniquely determined by the processing amount required for the induction heating device 10, these are also input to the control device 30 as fixed values. The low speed operation speed Vl of the drive motor 18 is the cycle time Ts and the high speed operation speed Vl.
Based on h, the calculation may be performed so as to maintain the average transport speed Vm, and the drive motor 18 may be output.

The operation control of the induction heating apparatus 10 having such a configuration by the operation apparatus is performed as follows. FIG. 2 is a flowchart showing the flow of operation control. The induction heating device 10 is driven, and the object to be heated 1 is placed inside the heating inductor 14.
2 is continuously loaded by the feed roller 20. The feed roller 20 is operated at the conveying speed Vm determined by the throughput of the induction heating device 10 (step 100). When the head of the article to be heated 12 conveyed reaches the discharge roller 26 from the outlet of the inductor 14, the sensor 28 installed immediately after that.
Detects the tip of the object to be heated 12 (step 1
01).

This detection signal is output to the control device 30,
The controller 30 outputs to the feed roller 20 to switch the conveying speed to the high speed operation speed Vh (step 10).
2). At the same time, counting of the cycle time Ts set by the cycle timer 32 is started (step 10).
3). The object to be heated 12 is forcibly discharged by the discharge roller 26 to the subsequent process. This discharging speed is the same as that of the discharging roller 26.
Of the feed roller 20 and is preferably set higher than the feed roller 20.

When the discharge roller 26 conveys the object 12 to be heated, its rear end is detected by the sensor 28 (step 104). When this is detected, the operating speed of the feed roller 20 is switched to the low speed Vl (step). 105). The low speed operation is continued until the cycle time Ts is up (step 106), and when the time is up, the transport speed is switched to the high speed operation (step 1).
07). At the same time, the cycle timer 32 is reset (step 108), and the high speed operation is continued until the tip of the article to be heated 12 is detected by the sensor 28 (step 10).
9). After that, the process returns to step 105 and is repeated until the operation of the induction heating device 10 is completed, and when the end instruction is given, the operation is stopped (step 110).

With such a structure, it is possible to suppress the occurrence of temperature unevenness in the longitudinal direction of the object to be heated 12, and the object to be heated 12 discharged from the induction heating device 10 is required in the subsequent step. The cycle time Ts can be accurately maintained and supplied.

According to the above embodiment, the temperature unevenness from the front end to the rear end of the object to be heated is averaged. In particular, the cycle time Ts and the average transport speed Vm are uniquely determined by the amount of processing, and the high speed operation speed Vh is the drive motor 1.
It is determined by the performance of 8. Therefore, the low operating speed V
Since this control can be performed only by setting l, there is no need to perform troublesome settings, and the temperature uniformity in the longitudinal direction can be minimized while keeping the temperature of the heated object at a constant temperature with an extremely simple configuration. Therefore, it does not adversely affect the next processing step.

FIG. 3 shows an operation pattern of the transport speed of the feed roller 20. In the figure, Ts is the cycle time, Th
Is the transportation time at the speed Vh, and Vl is the transportation speed at times other than Th. Vm is the average speed,
In other words, the normal transport speed.

[0020]

As described above, according to the present invention, the object to be heated is driven at high speed for the time period from the outlet of the inductor to the discharge roller until it is detected by the detection sensor, and is operated at low speed at other times. However, since this is performed within the cycle time required by the post-process, it is possible to obtain an excellent effect that it is possible to suppress the occurrence of temperature unevenness of the discharged material to be heated with a simple configuration.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an operation control device of an induction heating device according to an embodiment.

FIG. 2 is a flowchart of a method of operating the induction heating device according to the embodiment.

FIG. 3 is a pattern diagram of operating speed.

[Explanation of symbols]

 10 induction heating device 12 heated object 14 heating inductor 16A, 16B pinch roller 18 drive motor 20 feed roller 22A, 22B pinch roller 24 drive motor 26 discharge roller 28 sensor 30 controller 32 cycle timer

Claims (2)

[Claims] 1. A plurality of objects to be heated are heated while being continuously fed by a feed roller having a variable conveying speed, and an object to be heated is forcibly discharged by a discharge roller provided at an outlet side of the inductor. In the method for discharging the heated object of the induction heating device, the feed roller is operated at a high speed during the cycle time required by the post-process until the completion of biting from the inductor outlet to the discharge roller. A method for discharging an object to be heated in an induction heating device, which comprises discharging the object to be heated by repeatedly operating at a low speed during the remaining time. 2. A feeding roller having a variable transport speed, which is provided at an inductor inlet portion of an induction heating device that continuously heats an object to be heated, and a high-speed discharge roller provided at an inductor outlet side portion. And a control device for inputting these signals, which is provided immediately downstream of the discharge roller, is provided with a heated object detection sensor, and a timer for setting a cycle time required for a subsequent process. Starts the cycle time counting by detecting the tip of the object to be heated by the sensor, operates the feed roller at high speed, and then switches to low speed operation of the feed roller by detecting the rear end of the object to be heated by the sensor. None,
After that, the operation control is repeated, in which the feed roller is operated at a high speed in the time zone until the tip of the object to be heated is detected in the cycle time area and the feed roller is operated at a low speed in the remaining time zone. Heated object discharge device of induction heating device.