JPH0638097Y2 - Flat glass bent roll - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a plate glass bending method for bending an original plate glass into a desired shape in the manufacture of a bent plate glass used for windows for automobiles, windows for buildings and the like. Regarding rolls.

[Prior art and its problems] In Japanese Examined Patent Publication No. 56-14613, a plate glass in a heat-softened state is transferred onto a roll group provided with a forming roll having a curved shape in the transverse direction, and the plate glass is bent by its own weight. With respect to the above, the forming roll is formed by arranging a plurality of segments in the axial direction thereof, and the outer peripheral surfaces of these segments are concave as a whole, and the roll material is formed, and asbestos having a silica-alumina composition that can be cut is used. It is disclosed that it consists of cement.

It is difficult to say that the forming roll made of the asbestos cement is easy to cut, and the fact that it is divided into a plurality of segments makes it rather difficult to work, and reworking when changing and correcting the curvature is not easy.

In addition, in Japanese Patent Publication No. 49-15453, in a roll for horizontally transporting a plate glass heated to a softened state, a flexible roll of felt made of silica, alumina fiber and silica fiber is spirally wound around a rigid roll core. It is disclosed that no scratches are left on the sheet glass during the transfer, but the known example differs from the present invention in that it is a plain roll that simply transfers the sheet glass, and a roll mark is generated on the sheet glass. The structure is also different from that of the present invention in that the felt is spirally wound around the roll so as not to exist. Furthermore, the present invention can be easily processed to have a desired curvature and can be changed and modified by the above-mentioned configuration, but such an effect cannot be expected in the known example. That is, the known example differs from the present invention in its purpose, configuration and effect.

The present invention solves the above problems and provides a flat glass bending roll that can be easily cut when forming, or can be easily reworked when the curvature is changed, and can be easily restored to a plain roll when necessary. is there.

[Means for solving problems]

The present invention is a roll that bends in the width direction while transporting heat-softened sheet glass, and heat-resistant fiber tapes made of a plurality of low-expansion ceramics are arranged in parallel in the axial direction on a heat-resistant shaft core made of a low-expansion ceramic to have desired thickness It is fixed by winding and is cut to have a desired curvature in the axial direction of the outer peripheral surface thereof, or the outer periphery thereof is coated with a heat resistant flexible fiber cloth made of low expansion ceramic.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front sectional view of a bending roll 1 of the present invention, and 2 is a heat-resistant shaft core made of low expansion ceramic, for example, silica or silica-alumina ceramic sintered body is adopted.

In the present invention, low expansion means an expansion coefficient of 30 × 10 ⁻⁷ / ° C. or less. It consists of a heat-resistant shaft core made of the low-expansion ceramic, a heat-resistant fiber tape made of the low-expansion ceramic described later, and a low-expansion ceramic. A heat resistant flexible fiber cloth is also specified in the expansion coefficient range.

Heat-resistant fiber tapes 3 and 3 made of low-expansion ceramics (hereinafter simply referred to as ceramic fiber tapes) are wound and fixed to the shaft core 2 to a desired thickness, respectively, and then have a desired curvature along the axial direction of the outer surface 4. It is cut and molded into.
As the ceramic fiber tape, silica fiber,
A cloth made of silica-alumina fiber, glass fiber containing high silica boric acid, or the like can be used.

A heat-softened plate glass (not shown) moves on the outer surface 4 of these ceramic fiber tapes 3 and moves by its own weight to follow the curvature of the outer surface 4.

The ceramic fiber tape 3 does not need to be arranged over the entire axial length of the shaft core 2, and may be partially formed at a desired portion as shown in the front sectional view of FIG. 2, for example.

The shaft core 2 and the ceramic fiber tape 3 are, of course, heat-resistant so that they do not soften or deteriorate even at a softening point of plate glass, for example, in the case of soda-lime glass above 720 ° C. ^{It has} a low expansion of ^-7 / ° C or less.

FIG. 3 is a plan view of the inside of a heating furnace (not shown) that employs the bending roll of the present invention. The heating furnace is divided into a preheating zone A and a bending zone B.

In the preheating zone A, the rolls are plain rolls 5 and 5.
... and curved rolls 6, 6 ', 6 ", which are smaller than the desired curvature, provided that the curved rolls 6
The curved rolls 6 ″ are arranged so that they gradually become larger. For example, a part or all of the curved rolls 6, 6 ′, 6 ″ may be replaced with the curved roll of the form shown in FIG. it can.

In the preheating zone A, the plate glass 8 is heated up to about 620 ° C. in the soda lime glass having the annealing point above the annealing point, for example, the annealing point at 550 ° C. and the softening point at 720 ° C. In this process, the plate glass 6 exhibits softening property. Bending zone B
, The curved rolls 7, 7 ... Having a desired curvature are arranged, and the plate glass is maintained near the softening point, for example, at about 660 ° C. or higher, and the curved rolls 7, 7 ... Make it bend.

When heated above the softening point, roll glass or the like is likely to occur on the plate glass.

Each of these rolls 6 to 7 has a shaft end (not shown) at one end thereof.
, Which are rotatably supported by a motor (not shown), can be rotationally driven, and the other end is rotatably supported by the other bearing 9 ', 9'. When setting the bending rolls 6 to 7, the bending center lines C are adjusted so as to coincide with each other at room temperature and then heated in the furnace to prepare for the transfer of the sheet glass 8. However, depending on the temperature distribution in the furnace and the expansion coefficient of the forming roll. Center line C is displaced. However, the expansion rate of the entire bent roll including the shaft core is 30 ×
If it is kept below 10 ^-7 / ° C, the deviation of the center line C will be negligible, and the complexity of readjustment can be eliminated.

FIG. 4 shows one means for manufacturing the curved roll 1 of the present invention. The heat-resistant shaft core 2 is made by impregnating the ceramic fiber tapes 3 ', 3' ... With a heat-resistant adhesive such as alumina cement. After coating, each tape 3'as shown
3 '... is wound and fixed to a desired thickness.

Next, a mold 12 having a polishing surface 11 having a desired curvature is applied, and the roll 1 is rotated and polished. It should be noted that the mold 12 can be made of a material that is easy to handle, such as wood.
It is sufficient to stick a polishing cloth in which abrasive grains of a mesh size are planted.

In this way, the curved roll 1 as shown in FIG. 1 can be manufactured very easily.

When the curvature is to be changed more greatly, a ceramic fiber tape impregnated or coated with an adhesive is additionally wound around a desired portion of the roll surface 4, and the same polishing as described above is performed with a mold having a polishing surface with a desired curvature. Can be easily reprocessed.

Further, peeling and removal of these tapes is easy, and the original plain roll 2 can be restored.

The surface 4 of the bent roll 1 has a certain degree of flexibility, and it is necessary to prevent roll scratches from occurring on the plate glass. For example, when the cement adhesive covers the surface and loses flexibility. 1 is a wide cloth made of flexible heat resistant fiber made of low expansion ceramic as shown in the front sectional view of FIG.
3. Attach silica / alumina sleeve, silica sleeve, for example. It is preferable that the fiber cloth 13 is applied with an adhesive in spots on the local areas D, E, and F so that it is retained.

[Effect of device]

According to the present invention, there is an effect that cutting is extremely easy, a desired curvature can be easily obtained, and the curvature can be easily changed and corrected.

[Brief description of drawings]

FIG. 1 is a front sectional view of a bent roll of the present invention, FIGS. 2 and 5 are front sectional views showing another embodiment, and FIG. 3 is a plan view showing the arrangement of rolls in a heating furnace, and FIG. FIG. 3 is a perspective view showing one manufacturing means of a curved roll. 1 ... Curved roll, 2 ... Shaft core 3, 3 ... Ceramic fiber tape

Claims (1)

[Scope of utility model registration request] 1. A roll that bends in the width direction while conveying a heat-softened sheet glass, and a heat-resistant fiber tape made of a plurality of low-expansion ceramics is arranged in parallel in the axial direction on a heat-resistant shaft core made of a low-expansion ceramic. A plate glass characterized by being wound and fixed to a desired thickness and being cut to have a desired curvature along the outer peripheral surface axial direction, or further coated with a heat resistant flexible fiber cloth made of low expansion ceramic on the outer periphery thereof. A song roll.