JP2516234B2 - Sheet glass forming method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for horizontally forming a sheet glass heated to near a softening point.

(Prior Art) Recently, as a method for forming window glass for automobiles, a plate glass heated to near the softening point is placed in a horizontal state by a conveyor roller, as compared with a method in which plate glass is hung by tongs and press-formed with left and right forming dies. As it is, it is conveyed to the ring mold or the lower mold, and the plate glass is bent by its own weight or between it and the upper mold.

By the way, when plate glass is formed by a forming mold such as a ring mold as described above, if the positions of the plate glass and the forming mold are not exactly aligned with each other, a bad mold contact occurs. For this reason, conventionally, as disclosed in Japanese Patent Publication No. 57-54455, a stopper for contacting the front end of the sheet glass is provided in the sheet transporting zone to align the sheet glass.

(Problems to be Solved by the Invention) In the above-mentioned conventional example, since the front end portion of the plate glass is brought into contact with the stopper, the plate glass is likely to be distorted and the plate glass cannot be conveyed at a high speed. . Further, just by applying the front end of the plate glass to the stopper, the twist in the conveying direction can be corrected but the shift in the width direction cannot be corrected.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a sensor for detecting the amount of twist and the amount of deviation in the width direction of a sheet glass during conveyance in the conveying zone, and the amount of twist and the amount of deviation are provided. The correction device is used to rotate and move the molding die or the transfer device to the molding die by an amount corresponding to the above.

(Function) A member that forcibly corrects the position of the plate glass such as the conventional stopper by correcting the position of the plate glass with the plate glass being conveyed as a reference, instead of correcting the position of the plate glass with the mold as a reference. Is unnecessary and distortion is unlikely to occur.

(Example) Below, the Example of this invention is described based on an accompanying drawing.

FIG. 1 is a plan view of the molding apparatus according to the present invention, and FIG. 2 is a side view seen from the direction A in FIG. The downstream side of the forming zone 3 is a forming zone 3, and in the conveying zone 2 and the forming zone 3, conveying rollers 4 for conveying the plate glass G discharged from the heating furnace 1 in a horizontal state are arranged at predetermined intervals.

Further, sensors 5, 6, 7 for detecting the amount of twist and the amount of deviation in the width direction of the sheet glass G being conveyed are provided between the conveying rollers 4 in the conveying zone 2. These sensors 5, 6, 7 are formed by arranging a large number of optical fibers in a direction orthogonal to the transport direction, that is, in the width direction of the glass sheet G to be transported, and the sensors 5, 6, are at the same position with the transport direction as a reference, and The sensor 5 is arranged at a position where the left front end of the glass sheet G passes, the sensor 6 is arranged at a position where the right front end of the glass sheet G passes, and the sensor 7 is arranged at a position where one rear end of the glass sheet G passes. It is located in. Thus, the twist amount of the plate glass G with respect to the conveying direction is such that, after one of the sensors 5 and 6 detects the front end portion of the plate glass G, the other sensor waits until the other sensor detects the plate glass G.
Of the optical fiber constituting the sensor 7, the front end of the sheet glass is detected, that is, the detection time difference between the sensors 5 and 6 is detected. Detect by. The means for detecting the twist amount and the shift amount of the plate glass G is not limited to the above.

On the other hand, in the molding zone 3, a ring mold 8 and an upper mold 9 as molding dies are arranged.

The ring mold 8 is provided on the correction device 10. This correction device 10 is provided with rails 12 ... In a direction orthogonal to the conveying direction on a base 11, and sliders 14 provided on the lower surface of the support plate 13 are engaged with these rails 12 ...
The rotation of a servomotor 15 fixed on 11 is transmitted to a ball screw 18 via a speed reducer 16 and a coupling 17, and a support plate 13 provided with a nut 19 screwed to the ball screw 18 is in a direction orthogonal to the conveying direction. To be able to move to.

Further, a swivel shaft 21 is penetratingly supported in the center of the support plate 13 via a bush 20, and a pinion 23 of a servomotor 22 with a reduction gear fixed to the lower surface of the support plate 13 and a gear 24 fitted to the lower end of the swivel shaft 21. Are engaged with each other so that the table 25 attached to the upper end of the swivel shaft 21 can swivel in a horizontal plane. Furthermore, rotation of the turning table 25 is disc brake.
While being stopped at 26, a holding frame 27 is erected on the table 25, and the holding frame 27 supports the ring mold 8.

Further, among the conveying rollers 4 provided in the molding zone 3, the conveying rollers 4a located in the ring mold 8 are independently moved up and down by the cylinder unit 28.

A molding method using the molding apparatus having the above configuration will be described below.

First, the plate glass G heated up to near the softening point by passing through the heating furnace 1 is delivered to the transport rollers 4 in the transport zone 2. The plate glass G is conveyed in a horizontal state by the conveying roller 4, and during this conveyance, the sensors 5, 6, 7 detect the twist amount of the plate glass G with respect to the conveying direction and the shift amount in the width direction. . This detected amount is input to the control device 30.

Then, by a signal from the control device 30, an amount corresponding to the twist amount and the shift amount in the width direction is generated by the servo motors 15, 22.
Is driven to rotate and move the ring mold 8 in the width direction. In other words, the servo motor 15 is used to move the ring mold 8 in the width direction, and the servo motor 22 is used to rotate the ring mold 8 in the horizontal plane, and the plate glass G conveyed on the ring mold 8 is placed without displacement. The means for delivering the plate glass G to the ring mold 8 is such that when the plate glass is conveyed from the conveying rollers 4 ... to the conveying rollers 4a ... Above, the rotation of the conveying rollers 4a is stopped, and then the cylinder unit 28 is actuated. 4a ... are lowered and the plate glass G is transferred onto the ring mold 8.

After that, the plate glass G is pressed by its own weight or using the upper mold 9, and then conveyed to the next step.

Incidentally, in the embodiment, an example in which the sheet glass is directly conveyed from the conveying roller to a forming die such as a ring mold,
You may make it transfer the plate glass on the conveyance roller 4 to a shaping die using transfer devices, such as a suction disk. Then, in the case of such a configuration, after rotating and moving the suction plate according to the detection posture of the plate glass, the plate glass is sucked, and then the posture of the suction plate is returned to the original state, and then the mold is placed on the molding die. After placing the plate glass or adsorbing the plate glass with the suction plate, rotate and move the ring mold or the suction plate according to the posture of the plate glass, release the suction and place the plate glass on the ring mold (molding die). You may make it mount.

(Effects of the Invention) As described above, according to the present invention, instead of correcting the orientation of the plate glass according to the forming mold such as the ring mold, the forming mold such as the ring mold according to the plate glass or the transfer device. Since the plate can be rotated and moved, the stopper does not hit the plate glass as in the conventional case, distortion does not occur, and the plate glass is conveyed at high speed, so that the molding cycle can be shortened.

[Brief description of drawings]

FIG. 1 is a plan view of a molding apparatus according to the present invention, and FIG.
It is the side view seen from the A direction of a figure. In the drawings, 1 is a heating furnace, 4 is a conveying roller, 5, 6 and 7 are sensors, 8 is a ring mold, 13 is a support plate, 25 is a table, and G is a plate glass.

Claims (2)

(57) [Claims] 1. A forming method in which a plate glass conveyed in a horizontal state is transferred onto a forming die, and the plate glass is bent by its own weight or between itself and the upper die, and is conveyed during the conveyance in the horizontal state. The twist amount of the plate glass with respect to the direction and the shift amount in the width direction are detected, and the mold or the transfer device to the mold is rotated and moved by the detected twist amount and shift amount based on the plate glass. A method for forming flat glass, which is a feature. 2. A molding apparatus provided with a molding die on which plate glass is placed on the downstream side of a transfer zone in which a plurality of transfer rollers for transferring plate glass in a horizontal state are arranged. A plate glass forming apparatus, characterized in that a sensor for detecting the amount of twist and the amount of deviation in the width direction is provided, and the molding die is rotated and moved by the amount of twist and deviation of the plate glass by a correction device.