CN1078121C - Method for processing plate-type glass edge, thermal reinforced sheet glass and fire precaution - Google Patents
Method for processing plate-type glass edge, thermal reinforced sheet glass and fire precaution Download PDFInfo
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- CN1078121C CN1078121C CN95120335A CN95120335A CN1078121C CN 1078121 C CN1078121 C CN 1078121C CN 95120335 A CN95120335 A CN 95120335A CN 95120335 A CN95120335 A CN 95120335A CN 1078121 C CN1078121 C CN 1078121C
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- 239000005357 flat glass Substances 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000012545 processing Methods 0.000 title claims description 38
- 239000011521 glass Substances 0.000 title claims description 28
- 238000005498 polishing Methods 0.000 claims description 42
- 238000005496 tempering Methods 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000009970 fire resistant effect Effects 0.000 abstract description 3
- 239000004035 construction material Substances 0.000 abstract 1
- 230000035882 stress Effects 0.000 description 30
- 238000010438 heat treatment Methods 0.000 description 11
- 238000005728 strengthening Methods 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000005340 laminated glass Substances 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000005346 heat strengthened glass Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/54—Fixing of glass panes or like plates
- E06B3/58—Fixing of glass panes or like plates by means of borders, cleats, or the like
- E06B3/5892—Fixing of window panes in openings in door leaves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C19/00—Surface treatment of glass, not in the form of fibres or filaments, by mechanical means
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
- E06B5/162—Fireproof doors having windows or other openings, e.g. for permitting ventilation or escape
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/92—Fire or heat protection feature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Special Wing (AREA)
- Building Environments (AREA)
Abstract
A method of finishing an edge of a sheet glass is disclosed. The method includes a first grinding step for grinding an edge of a sheet glass so as to provide the edge with an outwardly convex curved shape, and a finishing step for finishing a bordering portion which has been formed by the first grinding step between the curved edge and each flat side face of the sheet glass, so as to provide this bordering portion with a greater smoothness than smoothness provided by the first grinding step. A heat-tempered sheet glass using the method and a fire-resistant construction material using this heat-tempered sheet glass are also disclosed.
Description
The present invention relates to a method for processing an edge of a plate-like glass applicable to a fire-proof device such as a fire-proof door or window, a heat-strengthened plate glass using the method, and a fire-proof device using the heat-strengthened plate glass.
When a plate glass is used for a fire-proof device such as a fire door, it is necessary to increase the edge strength of the glass in order to prevent the plate glass from being thermally cracked. The thermal cracking phenomenon of the plate glass is a cracking phenomenon which occurs when the plate glass is heated, and the edge portion of the plate glass supported at the window frame or the like is subjected to a tensile stress due to thermal expansion occurring in the central portion of the plate glass, and the tensile stress exceeds the strength required for the edge of the plate glass.
As a fire-resistant sheet glass, a laminated glass is known, which incorporates an interlayer composed of a laminated glass and a hydrous silicate. The former has a risk of impairing the visibility due to the built-in screen blocking the visual field. The latter has the risk of impairing the transparency due to the intermediate layer becoming opaque by blistering on heating. As a method for eliminating these disadvantages, a soda-lime-silica glass is subjected to a heat strengthening treatment.
The heat strengthening treatment is a method in which a sheet glass is heated at a temperature higher than the softening point (720 to 730 ℃ C.) of the glass (about 760 ℃ C.) and cooled air is blown at a pressure very high enough to keep a back pressure of 950mmAq while continuously cooling the sheet glass with air. However, although the heat strengthening treatment of the sheet glass can achieve a predetermined edge strength, the sheet glass heated in a high temperature region exceeding the softening point of the glass is blown with strong pressure air, and the flatness of the glass surface is deteriorated, whereby warping may occur, and the reflection image may be not good.
Conventionally, as a method for processing the edge of the plate glass, as shown in fig. 6(a) and (b), a disk wheel 20 is rotated around its axis to bring a side face 20a of the wheel into contact with an edge 21a and a corner 21b of a plate glass 21 and to grind the edge so as to form a flat edge. Here, the disk wheel is provided with a diamond or a grindstone for polishing on a side surface 20a of the wheel.
In this method of processing the edge of a plate glass, fine grinding grooves which are difficult to be observed by naked eyes are generated at the corners due to grinding of the edge portions. Therefore, thermal stress caused by thermal expansion easily concentrates on the polishing grooves, and particularly in the soda-lime-based glass (which is not subjected to the heat strengthening treatment), there is a disadvantage that it is impossible to expect a high edge strength.
Therefore, the above-described heat strengthening treatment is required to be performed for use as fire-retardant sheet glass. As a result, the heat strengthening treatment causes a problem. In order to eliminate such a bad phenomenon (surface unevenness, generation of warp phenomenon) by the heat strengthening treatment, when the heat strengthening treatment (low heat strengthening treatment) is performed at a lower value of the heating temperature and the back pressure of the blowing air than in the case of the excess heat strengthening treatment, it is impossible to obtain an appropriate edge strength as a fire door, for example.
The object of the present invention is to provide a method of processing an edge of a plate glass which can eliminate the disadvantages of the prior art and can improve the edge strength of the plate glass, a heat-strengthened plate glass which ensures a predetermined strength of the edge of the plate glass by using the method, and a fire-proof appliance using the heat-strengthened plate glass.
In order to achieve the above object, the present invention provides a method of processing an end edge of a sheet glass in a process of manufacturing a heat-strengthened sheet glass, comprising: a first grinding step of grinding the end face of the plate glass into a single curved surface shape in which the central portion in the thickness direction of the plate glass is convexly curved outward; and a processing step of processing at least a boundary portion between a curved portion formed on an end surface of the plate glass by the first polishing step and front and back plane portions of the plate glass) further than the first polishing step; wherein, through the first grinding procedure, the maximum concave-convex degree of the grinding surface on the single curved surface of the plate glass is less than or equal to 0.05 mm; simultaneously, the maximum concave-convex degree of the processing surface on the boundary part is less than 0.007mm through the processing procedure; the end edge processing is completed only by the first grinding process and the processing process; the sheet glass whose end edge processing has been completed is subjected to a heat strengthening treatment.
Generally, stress generated in the plate glass is easily concentrated on the ridge portion. According to the method for processing the edge of the plate glass, at least the end face of the plate glass is ground into the curved surface shape protruding outwards through the first grinding process, and then the plate glass is further processed, the curved surface formed on the end face of the plate glass in the first grinding process and the edge part of the front and back planes of the plate glass are processed into smoother surfaces than those ground in the first grinding process, so that stress is difficult to concentrate on the edge of the end part of the plate glass. In particular, since the process of grinding the front and rear flat surfaces of the plate glass having a curved surface to a smoother surface than the first process is performed, when the edge portions are removed, a smoother surface is formed, thereby easily preventing stress concentration. As a result, the edge strength of the glass sheet can be greatly improved as compared with the conventional one.
In order to increase the edge strength, heat strengthening treatment may be performed, and even if heat treatment is performed at a lower temperature than in the past or air is blown at a lower pressure than in the past, the predetermined edge strength after heat treatment can be secured. As a result, the flatness of the glass surface is prevented from being lost, and warpage and reflection image are prevented from being deteriorated. Further, the running cost of the thermal strengthening treatment equipment can be reduced.
Therefore, according to the method of processing an edge of a plate glass of the present invention, it is possible to easily prevent concentration of stress generated from acting on an edge portion of the plate glass, and to greatly increase the edge strength of the plate glass as compared with the past. At the same time, even if the heat strengthening treatment is performed on the plate glass by a simpler method than in the past, the performance of the plate glass as a fire-proof glass can be maintained, the quality of the plate glass can be improved, and the running cost of the heat strengthening treatment equipment can be reduced.
The above-mentioned processing step can be carried out by various methods such as polishing, heating and melting, or chemical dissolution.
In the working process, if polishing and grinding are adopted, the edge strength of the plate glass can be further improved because the concave-convex degree of the grinding surface can be ground to the order of several micrometers.
Further, if the processing step is performed by a heating and melting method, the surface processed by the processing step may be processed to be the same as the surface of the plate glass, so that all the stress applied to the plate glass can be received by the end edge. As a result, the edge strength of the sheet glass can be further increased.
Further, if the above-mentioned working step is carried out by a chemical dissolution method, the working step can be carried out by a simple operation, and the efficiency of the working for working the edge of the end portion of the plate glass can be improved.
Further, in order to achieve the above object, a heat-strengthened sheet glass according to the present invention is characterized in that the edge of the sheet glass subjected to heat strengthening treatment on the entire surface is formed into a curved surface shape convexly curved outward in the sheet glass surface direction at about the middle portion in the sheet glass thickness direction, the degree of surface irregularity at the curved surface edge is processed to be less than 0.5mm, and the degree of surface irregularity at the curved surface edge and the edge portion of the front surface of the sheet glass is processed to be less than 0.007 mm.
By adopting the technical characteristics, the edge part of the plate glass which is subjected to heat strengthening treatment on the whole surface forms a convex curved surface edge towards the outer side of the plate glass surface direction at the middle part of the plate glass in the thickness direction, meanwhile, the maximum concave-convex degree of the surface of the curved surface edge is processed to be less than 0.05mm, and the maximum concave-convex degree of the surface of the edge part of the curved surface and the edge part of the front and back plane parts of the plate glass can be processed to be less than 0.007mm, therefore, the stress of the manufactured heat strengthened plate glass is difficult to concentrate at the edge part of the end part.
That is, at the curved surface edge that the board glass end edge formed, when the biggest unsmooth degree in surface is below 0.05mm, just for having processed smooth state, moreover, because no longer be the angularity shape at curved surface edge, so can avoid stress concentration at curved surface edge. Furthermore, the edge of the curved surface and the plate glassThe edge part between the front and back planes is processed into a smoother state when the maximum concave-convex degree of the surface is less than 0.007mm, and even if the edge part is viewed as the whole plate glass, the edge part which easily causes stress concentration disappears. As a result, stress concentration toward the edge of the end portion of the sheet glass can be avoided, and the edge strength can be structurally improved. This edge strength is about 4kgf/mm2The above.
Even in the curved surface shape in which stress concentration is hard to occur, when the degree of unevenness is larger than 0.05mm, stress is likely to be concentrated in the concave portions and the protruding portions of the unevenness. Further, at the edge between the curved surface edge portion and the front and back flat portions of the plate glass, when the maximum degree of unevenness exceeds 0.007mm, the surface-to-surface variation easily concentrates stress on the concave portions and the projecting portions between the unevenness.
Thus, by performing the heat strengthening treatment while increasing the edge strength as described above, even if the heat strengthening treatment is performed by heating at a lower temperature than in the past and blowing air at a lower pressure than in the past, the edge strength after the heat strengthening treatment can be secured, and the phenomenon that the reflection image is not good due to the unevenness and warpage of the glass surface as in the past can be prevented.
Therefore, according to the heat-strengthened sheet glass of the present invention, even if the sheet glass is heat-strengthened by a simpler method than in the past, the performance as a fire-resistant glass can be maintained, the quality as a sheet glass is improved, and the running cost of the heat-strengthening treatment facility is also reduced.
Further, according to the present invention, it is preferable that the surface compressive stress generated by the heat-strengthening treatment is 17kgf/mm2The above.
According to Japanese national institute of construction bulletin No. 1125, when a heat-strengthened glass sheet is used as a fire door for A and B types used in a fire prevention test, the edge strength of the glass sheet is not secured at 21kgf/mm2In the above case, there is a risk that the above-mentioned thermal cracking phenomenon occurs (as a supporting state of the plate glass, as shown in FIG. 2, at the periphery of the plate glass and a depth dimension of the door frame concerned (called as a snap-fit attachment)The margin) d is 10mm, and the periphery is held by a fixing metal frame 9 having good thermal conductivity). However, according to the structure of the present invention, the surface compressive stress due to the heat strengthening treatment is 17kgf/mm2The edge strength of the glass edge obtained by the above processing is 4kgf/mm2Taken together, the above, in practice, can ensure an edge strength of 21kgf/mm2The fireproof door can be used as the first-class and second-class fireproof doors without any problem.
When the glass is supported with the mounting margin d of 15mm, the temperature difference ratio between the peripheral portion and the central portion of the glass is large, and therefore the surface compressive stress must be 18kgf/mm2The above.
When the mounting margin d is 15mm and the support state using the fixed metal frame 9 is not used (refer to FIG. 5), the surface compressive stress must be 22kgf/mm2The above.
That is, the fireproof door can be used as a first-type or second-type fireproof door regardless of the above-described support state.
Furthermore, the fire-proof apparatus of the present invention is characterized in that the above-described heat-strengthened sheet glass is used, whereby a fire-proof apparatus such as a fire door or a fire window having more excellent fire-proof performance can be provided.
FIGS. 1(a) and (b) show examples for explaining the processing of the edges of a plate glass according to the present invention.
Figure 2 shows a cross-sectional view of the main portion of the fire rated door of the embodiment of figure 1.
FIG. 3 is a sectional view showing the state of the mounting plate glass of the embodiment.
FIG. 4 is a sectional view showing a state of a mounting plate glass according to another embodiment.
Figure 5 shows a sectional view of a main portion of the fire rated door of the embodiment.
Fig. 6(a) and (b) illustrate a conventional method for processing the edge of a plate glass.
Embodiments of the present invention are described in detail with reference to the accompanying drawings.
Fig. 2 shows a fire door 4 formed by installing a plate glass 3 processed at an edge 2 thereof on a window frame 1 according to an embodiment of the method for processing an edge of a plate glass of the present invention.
The sash 1 is composed of an annular frame body 5 forming a door frame portion, and a fixing member 6 detachably attached to an inner peripheral portion of the sash body 5 and fixing the plate glass 3 in the frame body 5.
The sash body 5 and the support member 6 are made of metal, which is considered to support the sheet glass 3 even in the event of a fire. The support member 6 is formed of a pair of angle members, and the sash body 5 is mounted between the angle members so as to form a gap 7 capable of fixing the edge 2 of the plate glass 3.
In the gap 7, an adjusting positioning block 8 made of chloroprene rubber having a function of protecting the edge end portion of the sheet glass 3 and a supporting metal clip 9 fixed in the supporting member 6 and holding the edge 2 of the sheet glass 3 are provided. The adjusting and positioning block 8 is arranged in the gap 7 at the lower side of the window frame 1.
The support metal clip 9 is made of a thin metal plate and is formed so as to be spring-clampable to the end edge 2 in accordance with the position of the plate glass 3 set in the gap 7. Specifically, the end edge 2 of the sheet glass 3 is formed to have a length dimension of substantially the entire length. Thus, as shown in fig. 2, the supporting metal clip 9 has a cross-sectional shape that is slightly opened at an angle in a "U" shape (a shape in which one upper side of a hexagonal figure is removed) when viewed from the longitudinal direction of the end edge 2, and both ends of the "U" shape are brought into line contact with the front and back surfaces of the sheet glass 3. Since the outer diameter of the support metal clip 9 is larger than the width of the gap 7, the end edge 2 of the sheet glass 3 can be placed in the gap 7 in a clamped state, and the sheet glass 3 can be strongly clamped and fixed by receiving the clamping pressure from the support member 6. As a result, the plate glass 3 is prevented from being thermally deformed and the peripheral portion of the glass is prevented from coming off in the event of a fire.
In addition, since the supporting metal clip 9 is made of metal (e.g., iron or stainless steel), it has good thermal conductivity and is easily and quickly adapted to the ambient temperature. In the case of a fire, the peripheral portion of the plate glass 3 supported by the plate glass 3 is also likely to transmit heat, and the temperature difference between the peripheral portion and the intermediate portion is unlikely to occur, so that the plate glass 3 is unlikely to be broken. When the difficulty of breaking the plate glass 3 is converted into the stress generated at the edge, the mounting margin d of the plate glass 3 is usually maintained at 15mm with respect to the support member 6 shown in FIG. 2, and the stress generated at this time is about 22kgf/mm2. However, in the supported state where the mounting margin d is less than 10mm, the temperature difference between the central portion and the peripheral portion of the plate glass is small, and the stress generated is relaxed by about 1kgf/mm2Then, it is about 21kgf/mm2。
Next, the plate glass 3 will be described.
The plate glass 3 is a soda-lime-based plate glass manufactured by a hanger-less manufacturing method, and is subjected to a thermal strengthening treatment after the following edge processing step.
The plate glass 3 is subjected to a first polishing step to polish the plate glass 3 to form a curved surface shape (the maximum degree of unevenness of a polished surface is 0.05mm or less) convexly curved outward in the surface direction of the plate glass 3 at a substantially middle portion in the thickness direction of the end surface of the plate glass 3, and a boundary portion 3c between a curved edge 3a formed on the end surface of the plate glass 3 in the first polishing step and a front and back plane 3b of the plate glass 3 is further polished to be smoother than that in the first polishing step (the maximum degree of unevenness of a processed surface is 0.007mm or less).
Specifically, the first polishing step is performed by a parallel-rotating cylindrical wheel type polishing method in which the outer peripheral surface of the cylindrical wheel 10 rotating on the axis is polished as shown in fig. 1 (a). The cylindrical wheel 10 is formed such that the outer peripheral surface thereof has a small diameter at a substantially central portion in the axial direction, and is configured to grind the end surface of the plate glass of the grinding portion into a curved surface shape protruding outward. Thus, the outer peripheral surface of the cylindrical wheel 10 is formed into a fine-ground surface having a grain size of less than 200 #.
The curved surface 3a polished in the first polishing step was processed to have a surface roughness of 0.03 mm. Since the processed surface is a very fine uneven surface, it is easy to avoid the phenomenon of stress concentration of the plate glass 3.
Further, since the polishing direction in the first polishing step is set to be along the longitudinal direction of the end face of the plate glass, the flaw formed by polishing is formed along the longitudinal direction of the end face of the plate glass, and concentration of thermal destruction force or the like acting along the plate surface of the plate glass 3 can be easily avoided.
In the above-described processing step, as shown in fig. 1(b), the polishing method is a polishing method in which the outer peripheral surface of the polishing belt 11 is rotated by the belt by two rotating shafts to polish the outer peripheral surface. This polishing and grinding is also called pole-machining, and is generally carried out using a belt 11 formed of sheepskin. In this polishing, it is also possible to polish the part to be polished while spraying an aqueous solution of cerium oxide (a polishing powder having a very fine particle size) to a fineness of 3 to 7 μm in order to obtain a surface roughness (approximately equal surface roughness of the front and back surfaces of the plate glass) and to cause gloss, which hardly causes stress concentration to the edge 3 c. However, in carrying out the present invention, the polishing agent is not limited to the above-mentioned cerium oxide, and other polishing agents may be used as long as the fine uneven surface can be processed.
In this way, the stress generated by the first polishing step and the reworking step can be made less likely to concentrate on the edge of the plate glass 3. In particular, the concentration of stress acting along the plate surface of the plate glass 3 is easily prevented. As a result, even if the heat generated by the fire was applied, the destruction phenomenon was hard to occur, and it was confirmed that the edge strength reached about 4kgf/mm2The above.
As described above, for example, a fire test was conducted according to Japanese publication No. 1125, usingIn the case of a plate glass for a fire door of type A or type B, the edge strength of the plate glass must be ensured to be 26kgf/mm in the general fire protection work shown in FIG. 52As described above (when the above-mentioned mounting margin is 15 mm), in the plate glass 3 of the present example, the stress generated at the time of supporting by the supporting metal clip 9 is relieved by 4kgf/mm2In addition, the edge strength of 4kgf/mm can be ensured by processing the end face2As described above, the heat treatment can be carried out at a minimum of 18kgf/mm2The strengthening of (2) is sufficient. Further, when the mounting margin is maintained at 10mm, the temperature difference between the center and the periphery of the glass sheet is somewhat reduced, and the thermal stress generated is also reduced, so that the minimum temperature of 17kgf/mm can be reached by the heat strengthening treatment2The strengthening of (2) is sufficient.
Therefore, when the sheet glass 3 is subjected to the heat strengthening treatment, instead of heating the sheet glass 3 at 760 ℃ and blowing cooling air as in the conventional case, the predetermined edge strength can be secured even when the heating temperature is not higher than the glass softening point (720 to 730 ℃) and the cooling air blowing back pressure is 500 mmAq. As a result, the deterioration of the quality of the glass sheet (the loss of the flatness of the surface and the occurrence of the warp) accompanying the heat strengthening treatment is prevented, and the yield is improved, and the running cost of the heat strengthening treatment equipment is reduced.
In addition, a total reflection stress measurement method can be used for measuring the edge strength (surface compressive stress as a substitute characteristic) of the heat-strengthened sheet glass 3. The total reflection stress measuring method is to measure the deviation between the boundary lines of the total reflection of light and shade appearing in the field of view of a reflected light observation telescope by means of known stress calibration by placing a prism having a refractive index slightly larger than that of a plate glass on the surface of the plate glass to be measured, and by making a circular polarized light beam incident on a measured point at an angle approximately equal to the critical angle of total reflection.
(1) The first polishing step is not limited to the polishing method using the parallel rotating cylindrical wheel type polishing method described in the above example. For example, a polishing method using a combination of a cup wheel polishing method (in which a diamond or a grindstone for polishing is attached to a surface of a wheel) and a polishing method, and a polishing method using a combination of these methods may be used.
The above-described processing method is not limited to the polishing and polishing described in the above example, and for example, a method of locally heating and melting the edge of the end portion of the plate glass 3 or a method of chemically dissolving the edge may be used. In short, at least the boundary portion 3c between the curved surface 3a and the front and back flat surfaces 3b of the plate glass 3 polished in the first polishing step is further processed to be smoother than in the first polishing step. Thus, the maximum surface roughness of the curved edge 3a is preferably 0.05mm or less, and the maximum surface roughness of the boundary 3c is preferably 0.007mm or less.
(2) The mounting of the plate glass 3 and the sash body 5 processed according to the present embodiment is not limited to the above embodiment. For example, as shown in fig. 3, if the elastic supporting metal clip 9a made of metal is used as the supporting metal clip, when the elastic supporting metal clip is fixed in surface contact with the frame body 5, the radiant heat to the frame body 5 can be efficiently transmitted from the supporting metal clip 9a to the periphery of the plate glass 3, the temperature difference between the middle part and the periphery of the plate glass is small, and the plate glass can be surely prevented from being broken.
(3) As another example of the mounted state, as shown in fig. 4, the frame body 5 is clamped and fixed by a metal elastic support metal clip 9b and a noncombustible plate (for example, a lightweight calcium carbonate plate) which are fitted in the beads 5 a.
(4) Further, as shown in FIG. 5, the structure is such that the glass plate 3 is supported by inserting a ceramic rope (rope) S1 and a ceramic paper sheet S2 into the gap 7 between the glass plate 3 and the support portion 6 without using the support metal clip 9.
When the structure is adopted, the edge strength of about 4kgf/mm can be ensured along with the processing of the glass plate end surface when the mounting allowance is kept at the normal 15mm2Therefore, the heat strengthening treatment is performed again as long as the minimum 22kgf/mm is reached2The strengthening of (2) is sufficient. When the mounting allowance is kept at 10mm, the mounting allowance is set byThe temperature difference between the central portion and the peripheral portion of the plate glass is somewhat reduced, so that the generation of thermal stress is reduced, and the minimum 20kgf/mm can be obtained by the heat strengthening treatment2The strengthening of (3).
Claims (9)
1. A method of processing an end edge of a sheet of glass in a process for manufacturing a heat strengthened sheet of glass, comprising:
a first grinding step of grinding the end face of the plate glass (3) into a single curved surface shape in which the central portion in the thickness direction of the plate glass is convexly curved outward; and
a processing step of further processing at least a boundary portion (3c) between a curved surface portion (3a) formed on an end surface of the plate glass (3) by the first polishing step and a front-back plane portion (3b) of the plate glass (3) than the first polishing step;
wherein,
the maximum concave-convex degree of the grinding surface on the single curved surface of the plate glass (3) is less than or equal to 0.05mm through the first grinding process;
at the same time, the maximum concave-convex degree of the processing surface on the boundary part (3c) is less than 0.007mm through the processing procedure;
the end edge processing is completed only by the first grinding process and the processing process;
the sheet glass whose end edge processing has been completed is subjected to a heat strengthening treatment.
2. A method of processing a glass end edge of a sheet during the manufacture of a heat strengthened sheet as claimed in claim 1 wherein the processing step is performed by any one of polishing, grinding, heat melting, or chemical dissolution.
3. The method for processing an end edge of a sheet glass in a process for manufacturing a heat-strengthened sheet according to claim 1, wherein the first polishing step is performed by a parallel rotating cylindrical wheel type polishing method in which polishing is performed using an outer peripheral surface of a cylindrical wheel (10) rotating around an axis.
4. A heat-strengthened sheet glass having a heat-strengthened surface on the entire surface thereof, characterized in that a curved edge (3a) having a single curved shape and convexly curved outward in the surface direction of the sheet glass (3) is formed at the edge portion of the sheet glass (3) at a substantially central portion in the thickness direction thereof; the edge part (3a) of the curved surface is processed until the maximum concave-convex degree of the surface is below 0.05 mm; and a boundary part (3c) between the curved surface edge part (3a) and the front and back planes (3b) of the plate glass (3) is processed to the maximum concave-convex degree of the surface below 0.007 mm.
5. The thermally strengthened sheet glass according to claim 4, wherein: surface compression by the heat strengthening treatmentForce of 17kgf/mm2The above.
6. A fire protection device, wherein a door frame (1) is provided with an annular metal frame body (5) forming a door frame portion and a metal support portion (6) attached to the frame body (5) and supporting a plate glass, characterized in that: the sheet glass (3) is a heat-strengthened sheet glass as claimed in claim 4 or 5.
7. The fire protection appliance of claim 6, wherein: the support member (6) is composed of a pair of members, and a support metal clip (9) for clamping the edge portion (2) of the plate glass (3) and fixing the plate glass (3) to the support member (6) is arranged in a gap (7) formed between the members.
8. The fire protection appliance of claim 67, wherein: the support member (6) is composed of a pair of members, and a support metal clip (9) for clamping the edge (2) of the glass (3) and fixing the plate glass (3) to the support member (6) and a non-combustible plate are arranged in a gap (7) formed between the members.
9. The fire protection appliance of claim 6, wherein: the support member (6) is composed of a pair of members, and a ceramic material is disposed in a gap (7) formed between these members, and the plate glass (3) is fixed to the support member (6) by sandwiching the edge (2) of the plate glass (3).
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP260859/1994 | 1994-10-26 | ||
| JP260859/94 | 1994-10-26 | ||
| JP26085994A JPH08118220A (en) | 1994-10-26 | 1994-10-26 | Method for finishing edge of plate glass |
| JP231055/1995 | 1995-09-08 | ||
| JP07231055A JP3133652B2 (en) | 1995-09-08 | 1995-09-08 | Thermally strengthened flat glass for fire protection |
| JP231055/95 | 1995-09-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1134336A CN1134336A (en) | 1996-10-30 |
| CN1078121C true CN1078121C (en) | 2002-01-23 |
Family
ID=26529673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95120335A Expired - Lifetime CN1078121C (en) | 1994-10-26 | 1995-10-26 | Method for processing plate-type glass edge, thermal reinforced sheet glass and fire precaution |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100217406B1 (en) |
| CN (1) | CN1078121C (en) |
| MY (1) | MY125707A (en) |
| TW (1) | TW568108U (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101707056B1 (en) * | 2009-03-10 | 2017-02-15 | 니폰 덴키 가라스 가부시키가이샤 | Glass substrate and method for manufacturing same |
| CN102427913B (en) * | 2009-05-15 | 2014-01-15 | 旭硝子株式会社 | Method for setting working position of grindstone for grinding glass end face |
| US8721392B2 (en) * | 2011-06-28 | 2014-05-13 | Corning Incorporated | Glass edge finishing method |
| CN103395976B (en) * | 2013-07-30 | 2015-07-08 | 深圳南玻伟光导电膜有限公司 | Reinforcing method for plate glass |
| JP6292397B2 (en) * | 2014-04-23 | 2018-03-14 | 富士紡ホールディングス株式会社 | Polishing pad |
| DE102016107535A1 (en) | 2016-04-22 | 2017-10-26 | Schott Ag | Flat glass product with increased edge strength and method for its production |
| CN106392781B (en) * | 2016-10-25 | 2019-01-04 | 伯恩高新科技（惠州）有限公司 | A kind of processing method at hard glass edge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3843472A (en) * | 1971-05-21 | 1974-10-22 | Glaverbel | Method of strengthening an edge of a glass article and article with strengthened edge |
| WO1987007253A1 (en) * | 1986-05-29 | 1987-12-03 | Hughes Aircraft Company | Glass structures |
| GB2245301A (en) * | 1987-11-20 | 1992-01-02 | Briggs Amasco Ltd | Frameworks for fire-resistant screens and doors |
-
1995
- 1995-10-26 CN CN95120335A patent/CN1078121C/en not_active Expired - Lifetime
- 1995-10-26 MY MYPI95003223A patent/MY125707A/en unknown
- 1995-10-26 KR KR1019950037348A patent/KR100217406B1/en not_active IP Right Cessation
- 1995-11-11 TW TW090217908U patent/TW568108U/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3843472A (en) * | 1971-05-21 | 1974-10-22 | Glaverbel | Method of strengthening an edge of a glass article and article with strengthened edge |
| WO1987007253A1 (en) * | 1986-05-29 | 1987-12-03 | Hughes Aircraft Company | Glass structures |
| GB2245301A (en) * | 1987-11-20 | 1992-01-02 | Briggs Amasco Ltd | Frameworks for fire-resistant screens and doors |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1134336A (en) | 1996-10-30 |
| KR960014044A (en) | 1996-05-22 |
| MY125707A (en) | 2006-08-30 |
| KR100217406B1 (en) | 1999-09-01 |
| TW568108U (en) | 2003-12-21 |
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