JPS6027627A - Forming of mold frame using glass base - Google Patents

Abstract

PURPOSE:To form a frame having high sealing performance, easily at a low cost, by heating and softening the inner surface of the designated part of a glass substrate rod having an arbitrary cross-section and bending the softened part inward with external force to form a loop of the glass rod. CONSTITUTION:The inner surface of the bending positions 2a, 2b, 2c, etc. of the glass substrate rod having e.g. square cross-section are heated and softened with a heater such as a burner or a hot air blower, etc., and the softened parts 2a, 2b, 2c, etc. are bent inward with external force at a desired angle to form a loop frame 3 of the glass rod leaving a gap 4 between both ends. The gap 4 is sealed with molten glass, etc. after the required working of the frame 3. A frame having excellent sealing property and durable for long-term use can be manufactured by this process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a glass mold such as a display tube that displays various displays by emitting light from a luminous body sealed inside.

Conventionally, for display tubes that are often used in calculators, etc., square glass rods of appropriate length are cut into pairs of upper and lower, left and right pairs of appropriate lengths, and then the joining surfaces at the four corners are heat-bonded, or A glass frame of any shape, such as a rectangular shape, was formed by pouring molten glass into a mold formed into a shape and solidifying it. However, in the case of heat bonding or mold-inserting, the process becomes complicated, which tends to cause problems in cost and quality (airtightness of the joint).

In order to solve the above-mentioned drawbacks, the present invention provides a glass formwork in which the lower surface of a rectangular bar-shaped glass base material in the bending direction is softened by heating and then bent by applying an external force. This is a molding method that allows for continuous operation, has high airtightness at the bent portion, and is capable of increasing the vacuum density of the display tube.

Hereinafter, the present invention will be explained in detail with reference to practical example diagrams. A portion 2a of the rectangular rod-shaped glass substrate 1 to be bent.

The inner surfaces of 2b, 2c, etc. are heated and softened using a heater such as a burner or a high-temperature hot air blower, and the heated and softened portions are folded at a desired angle using an external force and rotated around the 141st to create a formwork of an arbitrary shape. It is made to mold 3.

In the figure, 4 indicates the end gap of the molded form, 5 indicates the conventional form, and 6 indicates the four corner joints thereof.

Next, the effects of the present invention will be explained with reference to the drawings of practical examples. 4゜The glass base material 1 is easily softened when heated with a heater such as a burner, and the mold 3 is formed by bending the glass base material 1 at an appropriate angle and rotating it while pressing the exposed portion of the soft material 1. It is something. In Fig. 2, a rectangular formwork is shown,
The formwork is not limited to this shape, and may have any shape such as a polygonal shape, and in the work process, the glass base material 1 is sequentially bent at appropriate intervals from one end. Since it is only necessary to do this, process control is easy, the cost is low, and the bent portion has high airtightness.

When forming various display tubes using the formwork 3,
Insert the light emitter inside, glue glass plates, etc. to the front and back sides of the formwork 3, extend the control cord of the light emitter to the outside through the gap 4, and use the same gap 4 to depressurize the inside. It creates a vacuum and seals the gap 4 with molten glass or other filler, and has the remarkable effects mentioned above, such as good airtightness as a display tube and durability for long-term use. be.

[Brief explanation of drawings]

FIG. 1 is a front view of a glass substrate used to carry out the method of the present invention, FIG. 2 is a front view of a molded mold, and FIG. 3 is a front view of a conventional adhesive mold.

Claims (1)

[Claims] 1 The inner surface of a rod-shaped glass base material of any shape is heated and softened at a predetermined position to be bent, and the heated and softened portion is bent toward the inner surface at an appropriate angle using an external force and rotated to form a predetermined shape. A molding method using a glass base material.