JP2000053435A - Boring of hole in glass product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat efficiency, to reduce cost by eliminating the need for a polishing stage, or the like, and to extend the range of its use by forming a product with a part to be piercd with a glass forming machine thinner than the other parts, heating the part to be pierced while still hot with a burner to make a hole and then cooling the hole. SOLUTION: The part to be pierced with a hole by a press-forming machine in the forming stage is made thinner than the other parts. A semiprocessed glass item 1a leaving the press-forming machine is placed on a pan 4 on an intermittent conveyor 3. The thinly forming part (bottom) is then heated by a first burner 2a, further heated by a second burner 2b and burned off to make a hole (at the bottom), and a glass product 1b is obtained. Further, the hole part is cooled by a third burner 2c. Heating and boring can be performed by same burners, however good working is attained with discrete burners. The thickness of the part to be pierced is preferably controlled to 1.2-3.4 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for boring a glass product. In particular, the present invention relates to a method for boring a product immediately after being formed by a forming machine and still retaining heat.

[0002]

2. Description of the Related Art As a conventional method for forming a hole in a glass product, a method of forming a hole as a secondary processing after a glass is gradually cooled is generally used.
A method of making a hole using a diamond cutter has been used. However, when this method is used, the corners of the holes are sharp and unsightly and dangerous,
There was a drawback that required time and effort such as further polishing the corner. As a result, the cost is extremely high, which limits the product development and targets products at a reasonable price.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks and improves the thermal efficiency by performing a drilling process on a glass product immediately after molding. The present invention has been completed for the purpose of providing a method for boring a glass product in order to reduce the cost and to broaden the range of product applications, since there is no need for complicated steps. further,
For those that have undergone physical strengthening such as air cooling, it has been conventionally impossible to drill holes after slow cooling,
ADVANTAGE OF THE INVENTION According to this invention, a physical strengthening process can be performed after a drilling process, As a result, it becomes possible to manufacture a drilled product that has been subjected to the physical strengthening process.

[0004]

Means for Solving the Problems A method for boring a glass product according to the present invention, which has been made to solve the above problems, comprises:
In the glass forming method, the step of forming a hole with a forming machine in which the thickness of a hole to be formed is thinner than the thickness of another part, and subsequently heating the part where a hole is formed by a burner, forming a hole, and then cooling. It is characterized by having a process. Still further, the step of forming holes with the above-mentioned burner is heated, and the step of making holes is performed with separate burners.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in more detail with reference to the drawings. Here, FIG. 1 is a simplified representation of the process of drilling on an intermittent conveyor. 1a shows a glass product for which a hole is drilled on the bottom, and 3 shows an intermittent conveyor. First, a glass forming process is performed in which a portion to be drilled is formed to be thinner than other portions by a press forming machine (not shown). The glass product 1a, which is a semi-finished product from the molding machine, is transported and placed on the tray 4 on the intermittent conveyor 3. Thereafter, the thin-walled portion (bottom portion in the drawing) is heated by the first burner 2a, further heated by the second burner 2b, and burned off to form a hole in the bottom, thereby obtaining a glass product 1b. Further, the hole is cooled by the third burner 2c. Although the drawing shows a method using three burners, the heating and drilling process may be performed using only the first burner without using the second burner. However, foaming around the hole is less likely to occur, and the ridgeline of the hole becomes smooth. Therefore, it is better to use both the first burner and the second burner. In addition, in order to stabilize the target hole diameter at the third burner, it is preferable to install an air device for cooling the hole. On the other hand, the thickness of the portion to be drilled depends on the product form, burner conditions, etc.
It is better to be in the range of 3.4 mm. If it is thinner than this, it is possible to make a hole, but it will cause a glass defect called undulation in the recessed part. It is necessary and is not preferable in terms of thermal efficiency. Next, an ordinary slow cooling step is performed. At this time, a physical strengthening treatment such as wind cooling strengthening may be performed before the slow cooling step. In the drawings, the final product has a low height such as a dish-shaped product as an example, but as another form, a glass product 1 as shown in FIG. When processing and using, the product height is high, so after press molding,
It is easier to turn the product upside down, place it on a tray on an intermittent conveyor with its bottom facing upwards, and heat and drill in the same process as above.

Example 1 A dish-shaped glass product as shown in FIG. 1 was formed by a 6-section press forming machine. At this time, a part of a bottom part to be a drilled part was formed by changing a thickness as shown in Table 1 respectively. The target hole diameter was set to φ8 to 9.5. After that, they are transported and placed on trays on the intermittent conveyor, respectively. On the conveyor, the baking time is 2.8 seconds,
Burner conditions are oxygen pressure 1 kg / cm ² , hydrogen pressure 0.6 k.
g / cm ² . Heat each with the first burner,
Drilling was performed with a second burner, and cooling was performed with a third burner. Thereafter, a final glass product was obtained through a conventional slow cooling step. At that time, the completed state of drilling was visually observed. The results are shown in Table 1. In addition, as a comparative example, a punch device was provided after press molding, the thin portion at the center of the product bottom was cracked, and baked by a burner on the tray of the intermittent conveyor, but it was difficult to scratch, and even if it was scratched, it was a glass defect. Has occurred,
Drilling could not be performed normally.

[0007]

[Table 1]

[0008]

As is clear from the above description, the present invention improves the thermal efficiency by performing a drilling process on a glass product immediately after molding, and requires much labor such as polishing as in the conventional case. Since the number of processes is eliminated, costs can be reduced as a whole, and the range of product applications can be expanded. That is, it is useful for products that require drilling such as lid products and flower pots. Furthermore, in the present invention, it is conventionally impossible to perform drilling after slow cooling of a steel that has been subjected to physical strengthening treatment such as wind cooling strengthening, but in the present invention, drilling is performed immediately after molding. Therefore, a physical strengthening process can be performed thereafter, and as a result, a drilled product that has been subjected to the physical strengthening process can be manufactured. As mentioned above,
The present invention contributes to the development of industry as providing a novel method for drilling glass products, which can supply the drilled glass products with stable quality and at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a processing step of the present invention.

FIG. 2 is an example of a product according to the present invention.

[Explanation of symbols]

 1a Glassware 1b Glassware 2a First Burner 2b Second Burner 2c Third Burner 3 Intermittent Conveyor 4 Receiving Pan 7 Hole

Claims (2)

[Claims] In a glass forming method, a step of forming a hole at a portion where a hole is formed by a forming machine so as to be thinner than a wall of another portion, and a step of subsequently heating a portion to be formed with a burner to form a hole. And a step of cooling thereafter. 2. The method for drilling a glass product according to claim 1, wherein the step of drilling the hole is heated by a burner, and the step of drilling is performed by a separate burner.