KR19990007755A - Apparatus and method for manufacturing the curved glass product - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for manufacturing curved glass products and a method for producing the curved glass product, while greatly simplifying the installation of the apparatus, while greatly improving productivity.

Method for forming a curved glass product of the present invention is a method for molding a curved glass product by pressing the upper and lower molds,

Conveying the heated flat glass through the roller transport mechanism;

As a work to lift the flat glass conveyed into the space where the heat is maintained on the rollers, the lower mold having a plurality of grooves corresponding to the roller spacing so as to accommodate the rollers during the ascension is raised to protrude upward through the rollers. Making a step;

Continuously raising the lower mold to press the flat glass into a curved glass product so that the lower mold is integrated with the upper mold having a fixed position;

Simultaneously molding and injecting cooling air lower than the glass temperature into the glass surface between the upper and lower molds to lower the glass temperature;

Lowering the lower mold to place the curved glass molded product back onto the roller and then discharging it to the discharge portion by roller driving; Characterized in that consists of.

Description

Apparatus and method for manufacturing the curved glass product

The present invention relates to an apparatus for producing a curved glass product and a method of manufacturing the same.

In the case of automobiles, a rear view mirror having a block or a concave curved surface is used to observe or enlarge the wide rear region. In addition, glass products having a curved surface that is not flat are used in various ways such as a front window of a vehicle or a lid of a glass pot. .

Curved glass products are difficult to manufacture because they are formed by thermally deforming flat glass according to the curved shape, unlike flat glass products that cut and use large flat glass manufactured by glass factories by size. As long as the added value of the product is high.

As a conventional manufacturing method for producing curved glass products, two methods, vacuum suction type and press press type, are currently used.

In the vacuum suction type, as shown in FIG. 7, a flat glass 52 having a predetermined thickness heated to about 700 ° C. (surface is slightly melted) is placed on the curved molded surface 51 of the mold 50. A plurality of micro holes 54 are drilled in the mold 50 so that the space 53 formed between the curved molding surface 51 and the flat glass 52 communicates with the outside, and through the micro holes 54. By sucking the air contained in the space 51 with a vacuum pump (not shown), the flat glass 52 is adsorbed (adhered) to the curved molding surface 51 due to the pressure difference with the outside, so that the flat glass can be It is a manufacturing method that is transformed into a curved surface.

However, the vacuum suction type is difficult to mold in the case of a product having a large glass thickness or a large surface area, and thus, the vacuum suction type is limited to a molding production of products having a small surface area of 2 mm or less in thickness. As the mold 50 must be processed, the mold manufacturing cost increases, and if the vacuum pressure is large or the size of the hole is large, the glass adheres to the curved molding surface 51 and the molten glass is sucked into the micropore, thereby injuring the glass surface. There is a problem in that the productivity is low because the defect rate is very high, such as the average defect rate reaches 25%.

For this reason, the size of the micropores 54 is limited to 1 mm or less, but the problem that the micropores 54 are frequently clogged by foreign matters and cleaning is also inconvenient.

Press pressure type is to compensate for the above-mentioned drawbacks of vacuum suction type, and the curved state in which the flat glass 62 heated to about 700 ° C. is placed on the curved forming surface 61 of the mold 60 as shown in FIG. 8. The pressing mold 64 having the lower contour surface 63, such as the molding surface 61, is pressed down from the upper side to deform the flat glass 62 to be in close contact with the curved molding surface 61 to form curved glass. .

However, in the case of press press type, although it is widely used to solve the disadvantage of vacuum suction type in large part, press mold 64 to prevent cracking due to temperature difference when the press mold 64 contacts the flat glass 62 surface. In addition, it is inconvenient, energy-consuming, and the thin ceramic wool heat-resistant ceramic wool (65) on the glass surface in order to prevent the wound on the glass surface in contact with the pressure mold (64). Because work must be laid and workability is reduced, and above all, press molds are provided to cope with differences and sizes of curved shapes of products. Therefore, mold cost is greatly increased, and mold storage places of large areas for systematic management and storage of molds are provided. It has been pointed out that there is a spatial waste factor due to necessity.

Another problem is that if there is a foreign material in the press mold or ceramic wool, which is in direct contact with the glass surface, the glass surface is scratched, which inevitably costs a lot of money to maintain the working environment.

In view of these problems, the present inventor has proposed a new method for forming a curved product and a method of manufacturing the same through Korean Patent Publication No. 98-33443.

The above-described patent disclosure by the inventors of the present invention is to place the flat glass seated on the curved molding of the mold conveyed along the roller in the space disconnected from the outside through the hood cover, and then supply the compressed air heated in the disconnected space. It is proposed a method of producing curved glass products by deforming the air pressure acting on the upper surface of the flat glass to be in close contact with the curved surface of the mold.

The invention of the above-mentioned patent is not limited to the size of the product and can significantly reduce the molding time, cost and product defect rate, but is a very effective invention, but has some problems as follows.

In other words, in addition to the above press press type, a common problem is that a large amount of molds are needed to transport the glass, and a device for placing and lowering the glass on the mold and a conveying device for the mold is greatly increased. When the mold is transferred to the outside and exposed to the outside of the insulation chamber, the mold having a large latent heat effect is maintained as it is, while the curved glass product which is placed on the mold and completed the molding is in contact with external cold air. Defects such as deformation or cracking due to quenching appear high, and for the purpose of preventing product defects due to rapid temperature difference, the mold stays in the insulation chamber until it cools down to a certain degree before being transported to the outside. If it is possible to prevent product defects due to rapid cooling, It is accompanied by a problem that the production rate of product degradation. In addition, since the mold must be stopped during molding of the product, the roller drive must be stopped once, and the production speed is slowed down. Also, the surface of the glass is melted so that the surface of the glass melts. There is a problem in that the cost increases due to the maintenance of conditions and the increase of the defective rate.

Accordingly, the present invention has been proposed in view of the above problems, and its object is to provide a device for manufacturing curved glass products and a method for manufacturing the curved glass product, which are greatly simplified in productivity while greatly improving the installation of the apparatus. have.

An apparatus for manufacturing a curved glass product of the present invention for achieving the above object is a transport mechanism consisting of a plurality of rollers are rotationally driven to transport the flat glass mounted on the upper surface;

A glass heating chamber provided to heat the glass transferred to the front position of the transfer mechanism;

An insulating molding work chamber provided with the heating chamber to keep the temperature of the heated glass maintained, and the curved molding work being performed on the glass;

An upper mold installed to have a fixed position on the upper side of the rollers in the thermal forming work chamber, the upper mold having a curved molding surface having the same shape as the curved contour of the curved glass product to be molded into the lower portion thereof;

Installed in a lower position opposite to the upper mold, the plurality of glass receiving the roller so as to project from the lower side of the roller to protrude upward through the rollers when the flat glass conveyed by the transfer mechanism reaches a position directly below the upper mold It has a curved forming surface intermittently formed by two grooves, and during the ascension, the air cylinder is operated until the curved forming surface lifts the flat glass on the roller and continues to be combined with the curved surface of the upper mold. A lower mold which is raised by to form flat glass into a curved glass product, and after the molding is completed, the lower mold is lowered by an air cylinder to lower down the roller so that the molded product is placed on the roller;

A cooling air supply passage formed in the upper or lower mold body to supply cooling air fed by an external air supply device to the surface of the glass product which has been curved by being pressed by the combination of the upper and lower molds; It is configured to include.

And the molding method of the curved glass product of the present invention in the method of molding the curved glass product by pressing the upper and lower molds,

Conveying the heated flat glass through the roller transport mechanism;

As a work to lift the flat glass conveyed into the space where the heat is maintained on the rollers, the lower mold having a plurality of grooves corresponding to the roller spacing so as to accommodate the rollers during the ascension is raised to protrude upward through the rollers. Making a step;

Continuously raising the lower mold to press the flat glass into a curved glass product so that the lower mold is integrated with the upper mold having a fixed position;

Simultaneously molding and injecting cooling air lower than the glass temperature into the glass surface between the upper and lower molds to lower the glass temperature;

Lowering the lower mold to place the curved glass molded product on the roller and then discharging it to the discharge part by roller driving; Characterized in that consists of.

1 is a view showing a curved molded glass device according to the present invention

Figure 2 is an enlarged view of the main portion of the curved glass forming apparatus of the present invention

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is an enlarged view for explaining the curved glass molding state according to the present invention

5 and 6 is a prior art

※ Explanation of codes for main parts of drawing

3: roller 5: feed mechanism

8 heating chamber 9 heating means

10: heat insulation molding room 12: upper mold

13: lower mold 14: groove

15 air cylinder 16 piston rod

19: fixed plate 20: flat glass

21: curved molded glass product 22: curved molded surface

23: curved surface 29: cushioning means

30,31: cooling air supply passage

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

1 to 4, a conveying mechanism composed of a plurality of ceramic rotating rollers 3 and a chain transmission mechanism 4 having a hollow cylindrical shape on a square frame 2 supported by a plurality of support legs 1; (5) is provided, and both ends of each roller (3) are rotatably supported by a bearing (6) or the like.

When the chain drive mechanism 4 is rotated by a motor, the rollers 3 are rotated in a clockwise direction based on the state shown in FIG. 1, and a fireproof wall is provided on the front side (left side) of the transfer mechanism 5. The heating chamber 8 built in (7) is provided. A burner or electric heating means 9 is provided in the heating chamber 8 to heat the temperature in the heating chamber 8 to maintain 550 to 630 캜, preferably 600 캜.

Here, if the glass 20 heating temperature is too low, the defective rate of cracking when subjected to deformation pressure due to bending due to the brittleness of the glass is high, and if the surface is so high that bubbles are generated by small dust particles, the above temperature conditions are most appropriate. Do.

After the heating chamber 8, the thermal insulation molding work chamber 10 is successively constructed, and the thermal insulation molding work chamber 10 is constructed of the heat insulating member 11, but no separate heating means for heating the interior is provided. not.

An upper mold 12 and a lower mold 13 are installed in the thermal forming work chamber 10, and the lower mold 13 is configured to accommodate the rollers 3 having a long axis installed across the frame 2. A plurality of grooves 14 are formed corresponding to the intervals t of the rollers 3, and the upper portions of the grooves 14 are open.

The upper and lower depths of the grooves 14 are preferably formed to be 1.5 times or more of the diameter of the rollers 3 so as to be completely accommodated in the grooves 14 when the rollers 3 are accommodated.

The lower mold 13 is fixed to the upper end of the piston rod 16 reciprocating up and down by the air cylinder 15, a plurality of guide shafts for guiding the lifting and lowering operation of the lower mold (13) without shaking ( 17 is fitted in sliding contact with the ball bush guide bearing 20 fixed to the fixed plate 19 mounted on the lower frame 18.

And it is preferable that the lower mold 13 is to be placed on the support plate (13a) rather than being directly fixed to the piston rod 17 so that replacement is easy when broken.

In addition, the upper surface of the lower mold 13 is formed with a curved molded surface 22 having the same shape as the contour of the curved surface of the curved glass product 21 to be molded. The curved forming surface 22 is intermittent in several sections due to the presence of the recesses 14 for accommodating the roller 3.

The upper mold 12 is located on the upper side opposite to the lower mold 13, and unlike the lower mold 13 that moves up and down, the upper mold 12 is in a fixed position. The lower portion of the upper mold 12 is provided with the same curved surface 23 so as to be combined with the curved surface 22 of the lower mold 13.

The upper mold 12 is fixedly installed to be disassembled and coupled to the fixed support plate 24 by bolts 25, and the fixed support plate 24 penetrates up and down the ceiling 10a of the thermal insulation molding room 10 ( 26) is fixed to the bottom.

The upper end of the rod 26 is restrained by a nut 28 or the like to the buffer plate 27, the buffer plate 27 between the ceiling (10a) and the cushioning means 29 by the elastic rubber or spring, shown in the embodiment In the example, it is supported through the tension spring.

Cooling air supply passages (30, 31, 32) are formed in the rod (26), the fixed support plate (24), and the upper mold (12), and the cooling air supply passages (30, 31, 32) are air supply pipes. It is connected to the air supply pump device (not shown) through (33), the cooling air supply passage (30, 31, 32) is opened to the atmosphere through the curved surface 23 of the upper mold (12).

Such a molding process of the curved glass article 21 according to the present invention will be described in more detail as follows.

When the flat glass 20 is placed on the ceramic roller 3 which is the tip of the transfer mechanism 5, the ceramic roller rotates by the drive of the chain mechanism 4 to transfer the flat glass 20 to the rear.

The flat glass 20 enters the glass heating chamber 8 along the roller 3, and the heating chamber 8 is about 550 to 630 ° C. with heat generated by the heating means 9 (preferably around 600 ° C.). Since the flat glass 20 is heated to about 600 ℃ while passing through the heating chamber (8).

The reason for keeping the heating temperature lower than the conventional reason is that the curved surface 22 is cut off by the groove 14 for accommodating the roller 3, so that the heating temperature is too high so that the glass 14 becomes dull. This is because sag occurs in the section, and the following unexpected effects are additionally obtained by keeping the glass heating temperature lower than before.

That is, in the case of the prior art by the press-pressing method, since the glass heating temperature is maintained at about 700 ° C., it takes a long time for the temperature of the glass to reach that temperature, and usually, the glass 20 in the heating chamber 8 While the residence time is as long as 74 seconds, the present invention has to maintain a lower temperature, so it is possible to shorten the residence time in the heating chamber 8 to 45 seconds.

The flat glass 20 heated to about 600 ° C. through the heating chamber 8 is continuously transferred to the thermal insulation molding chamber 10. When the upper and lower molds 12 and 13 reach the positions, the air cylinder 15 is moved. It is operated to raise the lower mold 13 through the piston rod (17). When the lower mold 13 is raised, the rollers 3 are received downward of the grooves 14, and the upper curved surface 22 of the lower mold 13 protrudes above the roller 3, thereby providing a plurality of rollers 3. The flat glass 20 being transported on the roller is lifted onto the roller 3. Subsequently, the lower mold 13 is raised and pressurized until it comes into contact with the upper mold 12 so that the flat glass 20 is deformed by the upper and lower curved forming surfaces 22 and 23, and the curved forming surfaces 22 and 23. Molded into a curved surface, such as

At this time, the upper mold 12 has a fixed position, but can be slightly raised by the lower mold 13 which is raised in order to alleviate the impact, the amount of movement according to the rise is absorbed as the spring buffer means 29 increases. .

When the flat glass 20 is finished forming the curved glass product 21, the solenoid valve 34 is opened to open a temperature of 60 to 70 ° C., which is much lower than the glass temperature and higher than the normal room temperature, from an air supply pump device (not shown). Of the curved glass product 21 in which the cooling air having an air pressure of 0.5 to 0.8 kg / cm 2 is completed for 1.5 to 3 seconds through the air supply pipe 33 and the cooling air supply passages 30, 31, and 32. Feed evenly over multiple surfaces.

When relatively cold air of 60 to 70 DEG C is supplied, the temperature of the curved glass product 21 maintained at about 550 to 600 DEG C by the heat conduction phenomenon is rapidly cooled according to the heat conduction.

Here, the difference from the conventional method is that the high-temperature curved glass products of 650-700 ° C are exposed to air at 10-35 ° C (temperature in the workplace) as they exit the heat-molding work room. However, the present invention is a rapid quench that occurs at the moment when discharged out of the conventional thermal molding work room, because the present invention is primarily cooled by supplying the air of 60 ~ 70 ℃, which is a lower temperature of the product and a temperature higher than room temperature at the completion stage of molding It is possible to avoid the damage caused by.

After the cooling is completed, the lower mold 13 is lowered to the lower positions of the rollers 3 by the operation of the air cylinder 15, and the molded product 21 is placed on the roller 3 which is in the rotating state during the lowering. By the rotation of the roller (3) is to be transferred out of the thermal insulation molding room (10).

At this time, the glass surface is not damaged when contacting the rotary roller 3 because the curved glass product is already cured by cooling.

In this manner, after the molding is completed, the curved glass product 21 transferred out of the thermal insulation molding chamber 10 is collected from the roller 3.

Here, the upper and lower molding molds 12 and 13 may be provided in plural so as to be adjacent to each other as shown in the drawing, in which case, a plurality of molding operations may be performed at one time.

According to the present invention as described above, many molds that have to be provided in order to transfer the glass are omitted, and the residence time of the glass staying in the heating chamber is shortened, and the overall length of the working line is also reduced, thereby greatly reducing the installation cost. It is not necessary to stop the roller feeder for molding during the transfer, and after the molding is completed, the cooling air is supplied to the glass surface, cooled to some extent, and then transferred to the atmosphere. The productivity per unit time is reduced, and the effect is remarkably improved. Even when molding by contacting the upper and lower molds, unlike the conventional method, the glass does not cause scratches on the surface of the curved glass product even if fine dust is present on the surface due to the low heating temperature of the glass. There is.

Claims (2)

In the method of forming a curved glass product by pressing the upper and lower molds, Conveying the heated flat glass through the roller transport mechanism; Lifting the lower mold with a plurality of grooves corresponding to the roller spacing to raise upward through the rollers in order to lift the flat glass transported in the space where the heat is maintained, on the rollers to accommodate the rollers during the lift. Making a step; Continuously raising the lower mold to press the flat glass into a curved glass product so that the lower mold is integrated with the upper mold having a fixed position; Simultaneously molding and injecting cooling air lower than the glass temperature into the glass surface between the upper and lower molds to lower the glass temperature; Lowering the lower mold to place the curved glass molded product back onto the roller and then discharging it to the discharge portion by roller driving; Method for forming a curved glass product, characterized in that consisting of. A conveying mechanism comprising a plurality of rollers which are rotationally driven to convey the flat glass mounted on the upper surface; A glass heating chamber provided to heat the glass transferred to the front position of the transfer mechanism; An insulating molding work chamber provided with the heating chamber to keep the temperature of the heated glass maintained, and the curved molding work being performed on the glass; An upper mold installed to have a fixed position on the upper side of the rollers in the thermal forming work chamber, the upper mold having a curved molding surface having the same shape as the curved contour of the curved glass product to be molded into the lower portion thereof; It is installed in the lower position opposite to the upper mold, and when the flat glass conveyed by the transfer mechanism reaches a position directly below the upper mold to lift the rollers from the lower side of the roller to pass between the rollers to accommodate the rollers to protrude upwards. It has a curved forming surface intermittently formed by a plurality of grooves, and during the ascending, the air cylinder lifts the flat glass on the roller and then continues to form the surface forming surface of the upper mold. A lower mold which is raised by the operation to form the flat glass into a curved glass product, and after the molding is completed, the lower mold is lowered by the air cylinder to lower down the roller so that the molded product is placed on the roller; A cooling air supply passage formed in the upper or lower mold body to supply cooling air fed by an external air supply device to the surface of the glass product which has been curved by being pressed by the combination of the upper and lower molds; Apparatus for producing a curved glass product, characterized in that comprises a.