JPH0340930A - Heating device for body to be formed - Google Patents

Abstract

PURPOSE:To locally heat the bending formation part of a body to be formed while transferring it by detecting the specified sending rate of the transfer means together with the body to be formed when the body to be formed is transferred to the specified position and bringing an auxiliary heating means close to the body to be formed when a deep bending part is arrived under the auxiliary heating means. CONSTITUTION:A chain 26 is moved in the direction A by driving a servo-motor 16 to transfer a glass plate 30 in the direction B to enter into a heating furnace 35. The top end 30C of the plate 30 is detected by a sensor 12, and by its signal a control part 15 counts the number of pulses outputted from the pulse generator 16A of the motor 18 to drive a servo. motor 44 in the positive direction when the number of count is reached at a 1st set value, and the auxiliary heating means 14 is lowered, and the heater 42 of the means 14 is approached to a deep bending part when the deep bending part of the plate 30 is passed under the auxiliary heating means 14. At the same time, the revolving speed of the motor 18 is reduced by the signal sent from the control part 15, and the transfer speed of the plate 30 is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a local heating device for a molded object that can partially heat the molded object without stopping the molded object in a heating furnace.

[Conventional technology]

Conventionally, when bending an object to be formed such as a glass plate, the object to be formed is brought into a heating furnace and heated to a temperature that allows bending, and then the object is formed by its own weight and/or with a press die. The object to be formed is often bent and formed by pressing the object.

The heating method in this case can be divided into two methods depending on the type of heating furnace. One is when the heating furnace is a hanging press furnace or a gravity bending furnace.These furnaces allow the object to be formed to be stopped in the furnace, so the object to be formed is stopped and only the bent part of the object to be formed is removed. can be partially heated as desired by a local heater.

The other case is when the heating furnace is a roller hearth furnace, an air form furnace, etc. In these furnaces, the object to be formed is constantly being conveyed at a constant speed, so it is not possible to stop the object to be formed.

Therefore, since the object to be formed is heated while being conveyed, not only the bent portion but also the entire object to be formed is often heated, and it has been extremely difficult to narrow the temperature distribution, particularly in the direction of conveyance of the object.

(Problems to be Solved by the Invention) As mentioned above, in roller hearth furnaces and air form furnaces, there is almost no temperature difference and slight temperature difference in the conveyance direction of the to-be-formed object. When bending with a mold, there is a problem that sufficient formability cannot be obtained, especially when the deep bend line is substantially perpendicular to the direction of conveyance in the furnace.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating device for a molded object that can locally heat the portion of the molded object to be bent while conveying the molded object. shall be.

[Means to solve problems]

In order to achieve the above object, the present invention provides a heating device for heating and bending a molded object, which comprises: a heating furnace; a conveying means for transporting the molded object in the heating furnace; at least one auxiliary heating means that is movable up and down in the heating furnace and can be brought close to the object to be formed;
A driving means for raising and lowering the auxiliary heating means, a detecting means for detecting that the object to be molded conveyed in the heating furnace has reached a predetermined position, and a detection signal of the detecting means and a detection signal of the conveying means. By knowing the amount of movement of the molded object from the conveyance speed of the molded object, it is possible to know when the locally heated portion of the molded object reaches the lower part of the auxiliary heating means, and control to lower the auxiliary heating means by the drive means based on this information. It is characterized in that it has a control child actor that sends a signal to the driving means.

[Effect]

According to the present invention, the object to be molded is transported by the conveying means, and it is detected that the object to be molded has been carried into the heating furnace, and the amount by which the object to be formed is moved is detected by the transport means, and the object to be formed is moved by the transport means. When the deep bending portion reaches below the auxiliary heating means, the second driving means is driven to place the auxiliary heating means in a position close to the object to be formed, thereby heating the deep bending portion of the object to be formed. Once the deep bending portion of the object to be formed has been heated, the second drive means is driven to position the auxiliary force means away from the object to be formed.

In this way, the bent portion of the object to be formed can be locally heated during transportation of the object to be formed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating device for a molded object according to the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the heating device for a molded object according to the present invention mainly includes a conveying means IO, a sensor 12, an auxiliary heating means 14,
A drive servo motor 16 is installed on the drive sprocket 20 of the conveying means 10 via a drive shaft 18 .

In addition, the driving sprocket 20 and the horizontal driven sprocket 2
2 is rotatably supported via a shaft 24. An endless chain 2 is connected to the sprocket 20 and the sprocket 22.
6 is stretched, and rollers 28A, 28A... of a conveyor 28 are engaged with the chain 26, and 28A, 28
Δ... are each rotatable around a fixed rotation axis.

Therefore, when the servo motor 16 rotates counterclockwise in FIG. 1, the sprocket 20 rotates counterclockwise via the drive shaft 18, and the chain 26 rotates in the direction of the arrow in FIG. , o-ra 28A, 28A rotate in the clockwise direction. Therefore, the glass plates 30 placed on the rollers 28A, 28A move in the direction of arrow B in FIG.

The sensor 12 consists of a light projector 32 and a light receiver 34 :), and the light projector 32 and the light receiver 34 maintain a positional relationship such that the light emitted from the light projector 32 is received by the light receiver 34, and normally the heating furnace 35 A window is provided at a position where the inside can be seen through the window.The heating furnace has at least one auxiliary heating means 14 in addition to a heater that heats the entire furnace.

The auxiliary heating means 14 has a heater 42, which is attached to the lower end of a hanging rod 46, and the upper end 46Δ of the hanging rod 46 is threadedly connected to a focusing shaft 48 of a servo motor 44. This servo motor 44 is provided outside the heating furnace 35, and when the servo motor 44 rotates in the normal direction, the heater 42 moves down, and when the servo motor 44 rotates in the reverse direction, the heater 42 moves up.

The control unit 15 is connected to send a drive signal to the servo motor 16 via a cable 56, and also connects to the t-bo motor 1.
6 pulse generator 16A via a cable 50. Furthermore, the control unit 15 is connected to the light receiver 34 so that the signal from the light receiver 34 is manually inputted to the control unit 15 via the cable 52.
is connected. The control unit 15 also includes a cable 54.
A servo motor 44 of the heater driving layer is connected through the servo motor 44 of the heater driving layer.

The am section 15 has a first set value and a second set value for the number of pulses output from the pulse generator 16A of the servo motor 16.
The setting value is manually set. The first setting value determines the timing of bringing the auxiliary heating means 14 closer to the object to be formed 30, and the second setting value determines the timing of moving the auxiliary heating half-immersion 14 away from the object to be formed 30. be.

Furthermore, the control unit 15 controls the cable 5 when the number of pulses output from the pulse generator 16A reaches the first set value.
A signal for normal rotation of the servo motor 44 is transmitted to the servo motor 44 via the servo motor 4, and a signal is also transmitted to the servo motor 16 to control the rotation speed of the servo motor 16 to be slowed down. Here, when the servo motor 44 rotates normally, the heater 42 is lowered via the rotating shaft 48 and the hanging rod 46.

Also, control! ! '1s15 transmits a signal to the servo motor 44 to reverse the servo motor 44 when the number of output pulses of the servo motor 16 becomes equal to the second set value, and also stops the signal being transmitted to the servo motor 16. The rotational speed of the servo motor 16 is set to return to the initial state when the servo motor 44 is rotated in the reverse direction.The heater 42 is raised when the servo motor 44 is reversely rotated.

FIG. 2 shows an example of the appearance of a molded object 30 heated by the apparatus according to the present invention. 30A and 30B are deep bent parts that are bent deeper than other parts, and are parts that are locally heated by the apparatus of the present invention.

The operation of the heating device for a molded object according to the present invention configured as described in ffI will be explained.

First, when the servo motor 16 is driven, the subblock 20 is rotated counterclockwise via the drive shaft 18, and the chain 26 is rotated in the direction indicated by the arrow in FIG. chain 2
6 rotates in the direction of the arrow, rollers 28A, 28A...
rotates clockwise, and the rollers 28A, 28Δ...
The upper glass plate 30 is conveyed in the direction of arrow B. The transported glass plate 30 enters the heating furnace 35, and as the glass plate 30 is further transported, the tip 30C of the glass plate 30 enters between the emitter 32 and the light receiver 34, so a change occurs in the amount of light received by the light receiver 34, and the cable 5
The signal is transmitted to the control unit via 2. When the signal is transmitted to the control unit 15, the control unit 15 counts the number of pulses output from the pulse generator 16A of the pulse motor 16 via the cable 50, and the counted pulse number is the first
When the set position is reached, a signal for normal rotation of the servo motor 44 is transmitted from the control section 15 to the servo motor 44 via the cable 54. Therefore, the servo motor 44 rotates in the normal direction, causing the rotating shaft 48 screwed to the hanging rod 46 to rotate in the normal direction, so that the heater 42 descends together with the hanging rod 46.
When the deep bent portion 30A of the glass plate 30 passes below the auxiliary heating means Y4, the heater 42
Close to A. At the same time, control cable 56 from 115
A signal is transmitted to the servo motor 16 via the servo motor 16, and the rotational speed of the servo motor 16 is slowed down, so that the moving speed of the glass plate 30 is also slowed down.

Here, the heater 42 descends vertically toward the deeply bent portion of the glass plate 30 and heats 1 m 30 A of the deep bent portion of the object to be formed mainly with radiant heat. In this state, the glass plate 30 is conveyed in the direction of arrow El'JB, and one deep bent portion 30A of the glass plate 30 is heated.

When the number of output pulses from the pulse generator 16A becomes equal to the second set value, a signal for rotating the servo motor 44 in the reverse direction is output from the control unit 15 via the cable 54. The output signal is transmitted to the servo motor 44 and the glass plate 30
When the deep bending portion 30A has finished passing under the heater 42, the servo motor 44 is reversed and the heater 42 is vertically raised. At the same time, control i! The output of the signal transmitted from the LLN 13 to the servo motor 16 via the cable 56 is stopped, and the rotational speed of the servo motor 16 is returned to the normal speed.

As shown in FIG. 2, when there are two or more locally heated parts in the molded object 30, two or more heaters separated from each other by a distance corresponding to the distance of the locally heated parts may be used. Also, only one heater is used, and a third heater corresponding to the first setting value inputted to the control 1B15 in the same process as the above process
The other deep bent portion 30B may be extremely heated based on the set value and the fourth set value corresponding to the second set value).

As described above, according to the present invention, when heating the bent portion of the glass plate 30, the heater 42 can be vertically lowered to slow down the conveyance speed of the glass plate 30. 30 deep bending portion 30A.

The portion 30B can be reliably locally heated.

Further, when the glass plate 30 is not locally heated, the glass plate 30 moves at a normal conveyance speed, so the working efficiency does not decrease much. In addition, in FIG. 2, the six directions of arrows are the directions in which the glass plate 30 is conveyed.

In this embodiment, a device is described in which the auxiliary heating means is brought close to the deep bending part of the object to be formed and at the same time slows down the conveyance speed of the object to be formed. If sufficient local heating for deep bending can be achieved by simply bringing the molded object close to the deep bending part, the molded object may be heated while keeping the conveyance speed constant.

In the embodiment, the sensor 12 detects the tip 30A of the glass plate 30.
Although the heating is performed after the glass plate 30 has been fed by a predetermined amount by detecting this, markings on the bent portion of the glass plate 30 may be directly detected and the bent portion may be heated based on this positional relationship.

Incidentally, although the glass plate 30 was targeted in the above embodiment, the present invention is not limited to this, and other objects to be formed may also be heated.

〔Effect of the invention〕

According to the heating device for a molded object of the present invention, when the molded object is transported by the conveying means and the molded object is transported to a predetermined position, the sensing means detects the molded object and the The amount of feed is detected, and when the deep bending portion reaches below the auxiliary oil means, the driving means causes the auxiliary heating means to approach the object to be formed, thereby applying the deep bending portion of the object.

Therefore, the bent portion of the object to be formed can be reliably locally heated, and furthermore, a decrease in work efficiency can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic overall view of a heating device for a molded object according to the present invention, and FIG. 2 is a plan view of a glass plate heated by the heating device for a molded object according to the present invention. 10...Transportation means, 12...Sensor, 14
... Auxiliary heating means, 15 ... Control section, 16
．． 44... Servo motor.

Claims (2)

[Claims] (1) A heating device for heating and bending a molded object, comprising: a heating furnace; a conveying means for transporting the molded object within the heating furnace; at least one auxiliary heating means that can be brought close to the object being conveyed; a driving means for raising and lowering the auxiliary heating means; a detection means for detecting that the object has been heated, and a detection signal of the detection means and a conveyance speed of the object to be formed by the conveyance means to determine the amount of movement of the object to be formed, so that the locally heated portion of the object to be formed can be heated by the auxiliary heating means. 1. A heating device for a molded object, comprising: a control means that determines when the auxiliary heating means reaches the lower part and sends a control signal to the driving means to cause the driving means to lower the auxiliary heating means based on the determination. (2) The heating device for a molded object according to claim (1), wherein the conveyance means slows down the conveyance speed of the molded object when the local heating section of the molded object is located below the auxiliary heating means. .