JPH02204337A - Method and device for shaping plate glass - Google Patents

Abstract

PURPOSE:To cut a plate glass regardless of the skillfulness of an operator and sharpness of a tool to be used, to reduce the product defect rate and to improve the working efficiency by marking a cutting line of the specified shape on the surface of the plate glass by a cutter, heating the outer parts of the line and removing the parts. CONSTITUTION:The plate glass 10 is previously marked with a cutting line 1 of the specified shape by a cutter, held by an evacuating means 12, and transferred under a heating means 14 by a conveyor means 13. The outer parts of the line 1 are then heated by the heating means 14. Consequently, when the line 1 is marked by the cutter on the surface of the plate glass 10, a crack is formed along the reticular structure in the plate glass 10 when the cracked plate glass 10 is heated, the cracking further proceeds by the thermal strain and the crack reaches the opposite surface, and the plate glass 10 is easily cut along the line 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for shaping a plate glass into a predetermined shape.

(Prior Art) For example, a rearview mirror for an automobile is configured in a predetermined manner. The car rearview mirror is wide 11! It has a convex mirror to provide a rearward view of the enclosure. For this reason,
Mirrors are made by heating and bending a plate glass that is thicker than the final predetermined shape, cutting lines into the final predetermined shape using a cutter on the convex surface, and removing the outside part of the cutting line. The final predetermined shape was obtained by shaping the sheet glass in two stages.
This is because internal distortion concentrates in the surrounding area, causing distortion in the image, so the surrounding area is removed to obtain a high-quality product.

In actual work, for example, in the case of a rectangular mirror glass plate 10 as shown in FIG. 7, a cutting line 1 of approximately similar shape is cut inside the rectangular plate glass 10 using a carbide cutter. The cutting line 1 is drawn in one stroke using an automatic machine, starting from 1a and going around counterclockwise, and then drawing the leader line 2 to the outside to finish.

The depth of the cutting IIFi wire 1 is about 0.5a in the case of soda plate glass having a thickness of 2ag. When a cut 3 is made in the corner of such a plate glass adjacent to the leader line 2 using a tool called a cutter, a crank enters from the cut 3, and this crack progresses from the cutting line 1 to the leader line 2, causing damage to the surrounding area. 4
falls off from the main body part 5.

Next, when another notch 6 is made at the corner opposite to the notch 3, a crack appears in the cutting line 1 from the notch 6 and the remaining peripheral portions 7 and 8 fall off from the main body 5. At this time, each peripheral portion 4, 7.8 falls off in a manner that it scatters outward from the main body portion 5 because the crack enters into a wedge shape.

(Problem to be Solved by the Invention) However, when the peripheral portions 4,7.8 fall off from the main body 5 and the peripheral portions 4,7.8 hit or rub against the main body 5, the main body 5 A small clam-like flaw, called a hamachi, is formed in that part of the product, resulting in a product defect. Such chipping is greatly affected by the skill level of the worker and the sharpness of the cutter, and particularly the finishing of the cutter blade requires a high degree of skill.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for shaping sheet glass that can significantly reduce product defects due to chipping, regardless of the skill level of the operator and the sharpness of the tools used.

(Means for Solving the Problems) A method for shaping a glass plate according to the present invention includes the steps of cutting a cutting line into a predetermined shape on the surface of a glass plate using a cutter, and heating a portion of the glass plate outside the cutting line.

Further, the plate glass shaping apparatus according to the present invention includes a means for holding a plate glass on which a cut line has been cut into a predetermined shape using a cutter on the surface thereof, and a means for holding a plate glass having a cutting line cut into a predetermined shape by a cutter, and a means for holding a plate glass having a cut line cut into a predetermined shape by a cutter, and a means for holding a plate glass having cut lines cut into a predetermined shape by a cutter, and a means for holding a plate glass having cut lines cut into a predetermined shape by a cutter, and a means for holding a plate glass having cut lines cut into a predetermined shape by a cutter, and a means for holding a plate glass having cut lines cut into a predetermined shape by a cutter. and means for heating the portion.

(Function) When cutting lines are made on the surface of a plate glass using a cutter, cracks occur along the mesh structure inside the glass plate. When a plate glass with such a rank is heated, cracks further propagate due to thermal strain and reach the opposite surface, and the plate glass is cut along the cutting line.

(Example) FIG. 1 schematically shows an example of a plate glass shaping apparatus according to the present invention. The overall configuration of this device includes a frame 11, a vacuum suction means 12, a conveying means 13, and a heating means 1.
4 and a control means (not shown). The plate glass 10 that serves as a rearview mirror for an automobile is formed into an upwardly convex curve as in the conventional example shown in FIG. be done. The plate glass 10 held by the vacuum suction means 12 is moved by the conveying means 13 to below the heating means 14, and the outside portion of the cutting line 1 is heated by the heating means 14 and removed.

Next, details of each means will be further explained with reference to the drawings. FIG. 2 is a schematic plan view of the vacuum suction means 12 and conveyance means 13 of this shaping device, FIG. 3 is a schematic right side view of FIG. The schematic plan view, FIG. 5, is a schematic front view of FIG. 4.

In FIGS. 2 and 3, the vacuum suction means 12 includes a circular cylinder 15 that supports the inner part of the cutting line 1 of the glass plate 10, and an annular groove 15a formed on the upper end surface of the cylinder 15. The rubber ring 16 is press-fitted so that half of it protrudes, and the vacuum suction tube 19 is attached to the attachment hole 18 provided in the support plate 17 that supports the bottom of the cylindrical body 15. It is connected to a vacuum suction device (not shown). The cylindrical body 15 may be rectangular or may have a bottom.

The cylinder 15 is fixed with bolts 20 to a support plate 17 that constitutes a part of the conveyance means 13, and the support plate 17 is connected to both side plates 21.2.
The hooks 2 are fixed by bolts 26 to two connecting rods 24 and 25, which are fixed by bolts 23. Two air cylinders 27.28 are fixed to one side plate 21 on both sides with bolts 29.30 with their tips facing inward, and brackets 31.32 are attached to the tips of each air cylinder 27.28. Roller-like positioning guides 33, 34 are mounted via the latter.

Further, an extension portion 17a is formed at one end of the support plate 17,
An air cylinder 35 is fixed to this extension 17a with a bolt 36, and a positioning guide 37 is attached to the tip thereof. This positioning guide 37 can be rotated to select a plurality of dimensions.

Rodless air cylinder 3 serving as a driving source for the conveying means 13
8, the slider 38a is fixed to the outside of one side plate 21 with bolts 39.

A rodless air cylinder (manufactured by Taiyo Tekko Co., Ltd.) 38 includes a slider 38a that moves on a cylinder duplex 40 by being magnetically attracted to a piston in a cylinder tube 40 to which compressed air is alternately supplied to both ends. The tube 40 has both ends attached to brackets 4.1.42.
each bracket 41,42 is supported by the frame 11
It is fixed to the top surface of the body with bolts 43 and 44. Furthermore, two slide bushes 45 and 46 are fixed to the outside of the other side plate 22 by bolts 47 and 48.

The slide bushes 45, 46 move on a guide shaft 49, and the guide shaft 49 is supported at both ends by brackets 50, 51, each bracket 50, 51 is attached to the upper surface of the frame 11 by a bolt 52, 53. Fixed. Also each air cylinder 27.28.35.38
A near compressor (not shown) is connected to.

The conveyance means 13 is constituted by each of the above members.

Next, the heating means 14 will be explained with reference to FIGS. 4 and 5. The hexagonal support plate 54 has its real part fixed to a beam 55 by a bolt 56, the end of the beam 55 is fixed to the upper end of a column 57 by a bolt 58, and the upper end of the column 57 is fixed to a frame by a bolt 59. It is fixed on the top surface of 11. A support block 60 having shaft holes perpendicular to each of the four longitudinal sides is fixed to the upper surface of the hexagonal support plate 54 with parallel opposite sides by bolts 61, and each shaft hole has a support block 60. Rad 62
is rotatably and slidably inserted, and the support block 60
It is fixed from the top surface with a bolt 63. The outer tip of each support rod 62 is divided into two forks in the shape of a fork, and a hot air jet @64 (
In FIG. 4, only the 1H position is shown) is inserted so as to be rotatable and vertically movable.
By fastening with bolts 65 and nuts 66, the position of hot air injection pipe 64 is fixed. The hot air injection pipe 64 is
An air duplex 67 is fixed to the upper end, and a cord 69 is connected to the heater section 68. Air tube 67 is connected to a blower, and cord 69 is connected to a power source. The lower end of the hot air injection pipe 64 is a flat nozzle 70 with a straight blowout lower 0a.

When using this shaping machine, first, the glass plate to be shaped is cut into an i-shaped body 1 whose center part is the vacuum suction means 12.
Rubber ring 16 of cylindrical body 15 so as to correspond to the center of 5
In this state, each air cylinder 27, 28, 35 is driven to adjust the position so that each positioning guide 33, 34, 37 of the conveying means 13 comes into contact with each corresponding side of the glass plate 10. Next, the rodless near cylinder 38 of the conveyance means 13 is driven to position the glass plate 10 on the cylinder 15 below the heating means 14 . Conveying means 13 here
The positioning is performed by the stroke end of the O-radless air cylinder 38.

With respect to the glass plate 10 positioned at this position, the nozzles 70 of each hot air injection tube 64 are positioned diagonally along each outer corner of the cutting line 1 of the glass plate 10, as shown in FIG. In addition, in order to avoid the influence of heat on the plate glass main body 5, the inner end of the blowout lower 0a is aligned with the cutting line 1.
Adjust to move away from. This adjustment can be done by adjusting the bolt that is the adjustment means, that is, the vertical direction, that is, the vertical direction and direction of the nozzle 70, by loosening the bolt 65 at the tip of the Orad 62 that supports the hot air injection tube 64. The horizontal position n of the nozzle 70 is determined by moving the nozzle 70 relative to the parts 62a, 62b.
This is done by loosening the bolts 63 to rotate the support block 60 and moving the support rod 62 relative to the support block 60 by loosening the bolts 63.

After the adjustment is completed in this way, the conveying means 13 is returned to the original starting position and the actual shaping process begins.

The glass plates 10 to be shaped are placed one by one on the cylinder 15 by an operator and vacuum suctioned, or automatically placed on the cylinder 15 by a robot hand or a conveyor and vacuum suctioned. Next, the rodless air cylinder 38 of the conveying means 13 is driven to position the plate glass 10 under the heating means 14.

Hot air with a temperature of about 500'CJi and a pressure of about 0.1 g/ci is constantly ejected from the nozzle 70 of the hot air injection pipe 64 while the device is in operation. When the spray is sprayed for about 5 seconds on each corner of
1, each side of the portion outside the cutting line 1 falls off from the main body 5 so as to be able to flip outward.

After 5 seconds have elapsed, the conveyance means 13 returns to the original starting position, and the shaped glass plate 10 is manually or automatically removed from the n-body 15. Such υ control of the transport means is performed using a microsequencer.

When heating each corner of the rectangular glass plate 10 as in this embodiment, it is not necessarily necessary to insert the leader line 2 into the glass plate 10. When such a leader wire 2 is inserted, heating of the corner portion where the leader wire 2 is inserted may be unnecessary.

When the size and shape of the plate glass 10 to be shaped changes, the positioning guide 33.34.3 of the conveying means 13 is used.
7 and the position and direction of the nozzle 70 of the heating means 14 are adjusted again. The size and shape of the cylindrical body 15 of the vacuum suction means 12 may be changed according to the plate glass 10.

In the above embodiment, the outlet of the nozzle 70 of the hot air jet 64 is linear, but it may be in the form of spots arranged in a straight line, and when the leader line 2 is inserted, it may be heated in the form of a band. Further, as the heating means, a hot wire heater or the like may be used instead of hot air.

(Effects of the Invention) As described above, according to the sheet glass shaping method and device according to the present invention, the outside portion of the sheet glass with cutting lines cut in advance is heated and removed. Regardless of the sharpness or sharpness of the tools used, product defects due to chipping can be significantly reduced, work efficiency can also be greatly improved, and work can be automated, reducing production costs. It can make a big contribution.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a sheet glass shaping apparatus showing an embodiment of the present invention, FIG. 2 is a schematic plan view of a vacuum suction means and a conveying means in the same apparatus, and FIG. 3 is a schematic diagram of FIG. The right side view and FIG. 4 are a schematic plan view of the heating means in the same device, FIG. 5 is a schematic front view of FIG. 4, and FIG. FIG. 7 is a plan view of a plate glass for explaining a conventional method for shaping a plate glass. DESCRIPTION OF SYMBOLS 1... Cutting line, 2... Leading line, 10... Plate glass, 11... Frame, 12... Vacuum suction means, 13
... Conveyance means, 14 ... Heating means, 15 ... Cylindrical body, 16 ... Rubber ring, 17 ... Support plate, 19 ...
・Vacuum suction tube, 24°25...Connecting rod, 33.34.
37... Positioning guide, 38... Rodless air cylinder, 40... Cylinder tube, 45.46.
...Slide bush, 49...Guide shift, 5
4...Support plate, 55...Beam, 57...
Column, 60... Support block, 62... Support Orad, 64... Hot air injection pipe, 67... Air tube,
68...Heater part, 69...Cord, 70...Nozzle, 71...Crack.

Claims (2)

[Claims] (1) A method for shaping a plate glass, which includes the steps of: cutting lines into a predetermined shape using a cutter on the surface of the glass plate; and heating the outside portion of the cutting line of the glass plate. (2) A plate glass shaping device comprising: means for holding a glass plate on which a cut line has been cut into a predetermined shape using a cutter; and means for heating a portion of the held glass plate outside the cut line.