JPH0475854B2 - - Google Patents
Info
- Publication number
- JPH0475854B2 JPH0475854B2 JP61314392A JP31439286A JPH0475854B2 JP H0475854 B2 JPH0475854 B2 JP H0475854B2 JP 61314392 A JP61314392 A JP 61314392A JP 31439286 A JP31439286 A JP 31439286A JP H0475854 B2 JPH0475854 B2 JP H0475854B2
- Authority
- JP
- Japan
- Prior art keywords
- glass plate
- heating
- temperature
- face
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011521 glass Substances 0.000 claims description 181
- 238000010438 heat treatment Methods 0.000 claims description 65
- 238000000034 method Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 17
- 239000005341 toughened glass Substances 0.000 claims description 10
- 238000005336 cracking Methods 0.000 claims description 7
- 238000005728 strengthening Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims 1
- 230000000171 quenching effect Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000006058 strengthened glass Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009757 thermoplastic moulding Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/04—Tempering or quenching glass products using gas
- C03B27/044—Tempering or quenching glass products using gas for flat or bent glass sheets being in a horizontal position
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
- C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products
- C03B29/08—Glass sheets
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Discharge Heating (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、強化ガラス板の製造工程の途中でガ
ラス板端面を通電加熱して軟化成形するガラス板
端面のアークで通電してその通電電流のジユール
熱で軟化成形する方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to an electric current applied to an end surface of a glass sheet that is energized by an arc on the end surface of a glass sheet to be softened and heated during the manufacturing process of a tempered glass sheet. This relates to a method of softening and molding using Joule heat.
従来、強化ガラス板の端面処理は、ダイヤモン
ド砥石または研削ベルトを回転させながらガラス
板端面に接触させて、これらの研削装置をガラス
板と相対的に移動させながら行う。つぎに、第３
図に示すように、研削装置により端面処理をした
ガラス板Ｗ１０を搬送ローラ群３に搭載してガラ
ス板加熱炉１の搬入する。この加熱炉１の内部に
はガラス板昇温用ヒータ２ａ乃至２ｍが取り付け
られており、ガラス板を迅速に昇温しかつ加熱炉
の構造を最も簡単にするために、通常、１つの室
になつている。したがつて、加熱炉の出口でのガ
ラス板全体を例えば650℃まで昇温させるために
は、加熱炉１の雰囲気の温度は全体として700℃
近くになるようにガラス板昇温用ヒータが制御さ
れている。さらに、加熱炉１で650℃付近まで昇
温されたガラス板は、強制風冷室４において強制
風冷ノズル５から噴射される圧縮空気によつて急
冷されて強化ガラス板が製造されている。
Conventionally, the end surface treatment of a tempered glass sheet is performed by rotating a diamond grindstone or a grinding belt and bringing it into contact with the end surface of the glass sheet, and moving these grinding devices relative to the glass sheet. Next, the third
As shown in the figure, a glass plate W10 whose end face has been processed by a grinding device is mounted on a group of conveying rollers 3 and transported into a glass plate heating furnace 1. Heaters 2a to 2m for raising the temperature of the glass plate are installed inside the heating furnace 1. In order to quickly raise the temperature of the glass plate and to simplify the structure of the heating furnace, heaters 2a to 2m are usually installed in one chamber. It's summery. Therefore, in order to raise the temperature of the entire glass plate at the outlet of the heating furnace to, for example, 650°C, the temperature of the atmosphere in the heating furnace 1 as a whole must be 700°C.
The heater for raising the temperature of the glass plate is controlled so that it is close to the glass plate. Further, the glass plate heated to around 650° C. in the heating furnace 1 is rapidly cooled in the forced air cooling chamber 4 by compressed air injected from the forced air cooling nozzle 5 to produce a tempered glass plate.
従来の端面処理をした強化ガラスは、研削装置
による端面処理の工程と、加熱炉１によるガラス
板を強化する工程とは別の工程で行われていた。
この従来の研削装置による端面処理をする方法
は、ガラス板端面隅部の欠けが発生しやすいこ
と、面取り表面に長さ方向に沿つて微細な縞模様
が残存しやすいこと、冷却および研削屑を排出す
る水流のために作業環境が悪いこと等の問題点が
ある。これらの問題点を解決するために、従来の
研削装置による端面処理のかわりに、本発明に係
るガラス板端面を通電加熱して軟化成形する方法
を提供しようとするのであるが、この軟化成形す
る方法は、ガラス板端面の通電加熱による温度上
昇と他の面の温度との差により熱膨張の差異によ
るガラス板の割れが発生する。そこで、ガラス板
端面の通電加熱を行う前にガラス板全面を300℃
乃至450℃位に加熱しておく必要がある。さらに、
通電加熱による軟化成形をしたガラス板は徐冷し
なければ、ガラス板端面又は表面と内部との温度
差による熱膨張差が大きくなり、割れを生じると
いう問題点がある。
In conventional edge-treated tempered glass, the edge treatment process using a grinding device and the process of strengthening the glass plate using the heating furnace 1 are performed in separate processes.
This method of edge processing using conventional grinding equipment has the following problems: chipping easily occurs at the corners of the glass plate edge, fine striped patterns tend to remain along the length direction on the chamfered surface, and cooling and grinding waste. There are problems such as poor working environment due to the water flow discharged. In order to solve these problems, instead of the conventional end face treatment using a grinding device, we will provide a method of softening and forming the end face of a glass plate by heating it with electricity according to the present invention. In this method, cracks occur in the glass plate due to the difference in thermal expansion caused by a temperature rise due to electrical heating of the end face of the glass plate and the temperature of other surfaces. Therefore, before heating the edge of the glass plate with electricity, the entire surface of the glass plate was heated to 300°C.
It is necessary to heat it to about 450℃. moreover,
If a glass plate that has been softened and molded by electrical heating is not slowly cooled, there is a problem in that the difference in thermal expansion due to the temperature difference between the end face or surface of the glass plate and the inside becomes large, resulting in cracking.
本発明は、ガラス板端面の通電加熱を行う前に
ガラス板全面を300℃乃至450℃に加熱すること
と、通電加熱による軟化成形をしたガラス板の冷
却による割れを防ぐこととを、強化ガラスの製造
工程のガラス板加熱炉の途中で行うことによつて
工程の簡略化による省力化及び省エネ化を図るも
のであつて、第１図に示すように、
ガラス板加熱炉をガラス板加熱第１室１１とガ
ラス板温度保持室１２とガラス板加熱第２室１３
との少なくとも３室に分離し、ガラス板搬入側の
ガラス板加熱第１室１１でガラス板Ｗ１９を300
℃乃至450℃までの予め定めた所定の温度に加熱
する第１工程と、
所定の温度に加熱されたガラス板をガラス板温
度保持室１２においてガラス板の冷却による割れ
を生じない程度にガラス板全体を保温しておい
て、ガラス板端面に沿つて局部的に他部分よりも
高温でかつガラス板の軟化温度よりも低い温度に
加熱した後に、ガラス板Ｗ２１の端面に近接して
相互に間隔を置いて配置された複数の電極間に高
電圧を印加して各電極とガラス板端面間にそれぞ
れアーク放電を行わせて各電極間のガラス板端面
をジユール熱で軟化成形する第２工程と、
前記端面を軟化成形したガラス板全体をガラス
板加熱第２室１３でガラス板Ｗ３１を600℃乃至
700℃程度の強化温度域に加熱する第３工程と、
600℃乃至700℃に加熱したガラス板Ｗ４１を急
冷して強化ガラス板にする第４工程
とから成る強化ガラス板端面のアークで通電して
その通電電流のジユール熱で軟化成形する方法を
提案したものである。
The present invention heats the entire surface of the glass plate to 300°C to 450°C before applying electrical heating to the end face of the glass plate, and prevents cracking due to cooling of the glass plate that has been softened and formed by electrical heating. This is done in the middle of the glass plate heating furnace in the manufacturing process to save labor and energy by simplifying the process. 1 chamber 11, glass plate temperature holding chamber 12, and glass plate heating second chamber 13
The glass plate W19 is separated into at least three chambers, and in the first glass plate heating chamber 11 on the glass plate import side, the glass plate W19 is
A first step of heating the glass plate to a predetermined temperature from ℃ to 450℃, and heating the glass plate heated to the predetermined temperature in a glass plate temperature holding chamber 12 to an extent that no cracking occurs due to cooling of the glass plate. After keeping the entire glass plate warm and heating it locally along the end face of the glass plate to a temperature higher than other parts and lower than the softening temperature of the glass plate, the glass plate W21 is placed close to the end face of the glass plate W21 and spaced apart from each other. A second step in which a high voltage is applied between a plurality of electrodes arranged at the same distance to generate an arc discharge between each electrode and the end face of the glass plate, and the end face of the glass plate between each electrode is softened and molded with Joule heat. , The entire glass plate with the end face softened and molded is heated at 600°C to 600°C in the second glass plate heating chamber 13.
The glass plate W41 heated to 600°C to 700°C is rapidly cooled to form a strengthened glass plate. The glass plate W41 is heated to a strengthening temperature range of about 700°C, and the glass plate W41 is rapidly cooled to form a strengthened glass plate. This paper proposed a method of softening and molding using the Joule heat of the current.
第１図は、本発明の強化ガラス板端面アーク通
電ジユール熱軟化成形方法を実施するために、ガ
ラス板加熱第１室１１とガラス板温度保持室１２
とガラス板加熱第２室１３との３室に分離した加
熱炉の垂直方向の断面図を示す。同図において、
３はガラス板を搬送するための搬送ローラ群であ
つて、ガラス板Ｗ１０をガラス板加熱第１室内に
搬入し、以後、第１室内でガラス板Ｗ１１からＷ
１９まで搬入する。この第１室１１内では、ガラ
ス板を短いラインで急速に昇温するためガラス板
昇温用第１群ヒータ２ａ，２ｂ，２ｃ，……，２
ｇによつて雰囲気が約750℃に上昇しており、こ
の雰囲気によつてガラス板全面が300℃乃至450℃
の所定の温度に加熱する第１工程が実施される。
FIG. 1 shows a first glass plate heating chamber 11 and a glass plate temperature holding chamber 12 in order to carry out the tempered glass plate end face arc energizing module thermal softening method of the present invention.
This is a vertical sectional view of a heating furnace separated into three chambers: a glass plate heating chamber 13 and a second glass plate heating chamber 13. In the same figure,
3 is a conveying roller group for conveying the glass plate, which carries the glass plate W10 into the first glass plate heating chamber, and thereafter transfers the glass plates W11 to W in the first chamber.
Delivered until 19. In this first chamber 11, in order to rapidly raise the temperature of the glass plate in a short line, a first group of heaters 2a, 2b, 2c, ..., 2 for heating the glass plate are used.
g, the atmosphere rises to about 750℃, and this atmosphere causes the entire surface of the glass plate to heat up to 300℃ to 450℃.
A first step of heating to a predetermined temperature is performed.
つぎに、第１工程で所定の温度に加熱されたガ
ラス板Ｗ２１は、ガラス板温度保持室１２におい
て、第２図で後述するように、ガラス板の冷却に
よる割れを生じない程度にガラス板全体を、ガラ
ス板保温用ヒータ２ｈにより保温しておいて、ガ
ラス板端面に沿つて局部的な他部分より高温でか
つガラス板の軟化温度よりも低い温度に加熱した
後に、ガラス板端面に近接して相互に間〓を置い
て配置された複数を電極間に高電圧を印加して各
電極とガラス板端面間にそれぞれアーク放電を行
わせて各電極間のガラス板端面をジユール熱で軟
化成形する第２工程が実施される。 Next, the glass plate W21 heated to a predetermined temperature in the first step is heated in the glass plate temperature holding chamber 12 to the extent that the entire glass plate is heated to an extent that no cracking occurs due to the cooling of the glass plate, as will be described later in FIG. is kept warm by the glass plate heat retention heater 2h, and heated locally along the edge of the glass plate to a temperature higher than other parts and lower than the softening temperature of the glass plate, and then heated to a temperature that is lower than the softening temperature of the glass plate. A high voltage is applied between multiple electrodes arranged at a distance from each other to generate an arc discharge between each electrode and the end face of the glass plate, and the end face of the glass plate between each electrode is softened and molded using Joule heat. A second step is performed.
端面を軟化成形したガラス板全体をガラス板加
熱第２室１３において、600℃乃至700℃程度の強
化温度域に、ガラス板昇温用第２群ヒータ２ｉ，
２ｊ、……、２ｍにより加熱する第３工程が実施
される。 The entire glass plate whose end face has been softened and molded is heated to a strengthening temperature range of about 600°C to 700°C in the second glass plate heating chamber 13 using a second group heater 2i for heating the glass plate.
A third step of heating is performed using 2j, . . . , 2m.
ガラス板全体が600℃乃至700℃に加熱したガラ
ス板Ｗ４１を、強制風冷室４内で、強制風冷ノズ
ル５により急冷してガラス板を強化処理する第４
工程が実施される。 A fourth step in which the glass plate W41, whose entire glass plate has been heated to 600°C to 700°C, is rapidly cooled by the forced air cooling nozzle 5 in the forced air cooling chamber 4 to strengthen the glass plate.
The process is carried out.
ガラス板全体をガラス板加熱炉で加熱した後に
急冷することにより強化ガラスを製作する工程の
途中で、ガラス板を加熱するガラス板加熱第１室
１１と、アーク通電ジユール熱軟化成形端面処理
したガラス板を600℃乃至700℃程度の強化温度域
に加熱するガラス板加熱第２室１３と、急冷して
ガラス板を強化する強制風冷室４については、第
１図と同様であり作用の欄ですでに説明したの
で、実施例における説明は省略する。
During the process of manufacturing tempered glass by heating the entire glass plate in a glass plate heating furnace and then rapidly cooling it, there is a first glass plate heating chamber 11 that heats the glass plate, and a glass plate whose end face has been treated by arc energization and heat softening molding. The second glass plate heating chamber 13, which heats the plate to a strengthening temperature range of about 600°C to 700°C, and the forced air cooling chamber 4, which rapidly cools and strengthens the glass plate, are the same as shown in Fig. 1, and the operation section is Since it has already been explained in the above, the explanation in the embodiment will be omitted.
ガラス板端面を軟化成形する第２工程を実施す
るための装置の例を第２図を参照して説明する。 An example of an apparatus for carrying out the second step of softening and forming the end face of a glass plate will be described with reference to FIG. 2.
同図において、３は搬送ローラ群、１１はガラ
ス板全体を300℃乃至450℃の所定の温度に加熱す
るガラス板加熱第１室であつて、Ｗ１９はこの第
１室で所定の温度に加熱されたガラス板である。
このガラス板においてつぎの説明のために角頂点
に符号Ａ乃至Ｄが符されている。 In the figure, 3 is a conveying roller group, 11 is a first glass plate heating chamber that heats the entire glass plate to a predetermined temperature of 300°C to 450°C, and W19 is heated to a predetermined temperature in this first chamber. It is a glass plate made of
In this glass plate, the corner vertices are marked with symbols A to D for the following explanation.
搬送ローラ群３によつて、所定の温度に加熱さ
れたガラス板Ｗ２１がガラス板温度保持室１２に
搬送される。この搬送された位置の搬送ローラ群
３′は、前述したガラス板Ｗ１９の頂点の符号
AB間及びCD間の側端部分でガラス板Ｗ２１を
支持している。ガラス板Ｗ２１の中央位置の下方
には第１のパレツトPR１が配置されている。ガ
ラス板Ｗ２１がこの第１のパレツトPR１の定位
置に搬送されると、第１のラツクピニオンRP１
が矢印の符号Ｆ方向に移動して第１のパレツト
PR１をわずかに上方へ持ちあげてガラス板Ｗ２
１を搬送ローラ群３′から浮き上がらせるととに、
矢印の符号Ｆ方向に移動させる。この移動の途中
でガラス板Ｗ２１の側端AD及びBCを、第１及
び第２の局部加熱ヒータ又は可燃性ガス炎HT１
及びHT２によりガラス板Ｗ２１の側端を450℃
乃至500℃に局部加熱する。ガラス板がガラス板
加熱第１室で450℃に加熱され、かつこのガラス
板温度保持室１２内でのガラス板端面温度を450
℃に設定するときは、局部加熱ヒータ又は可燃性
ガス炎HT１及びHT２は省略することができる。 The conveying roller group 3 conveys the glass plate W21 heated to a predetermined temperature to the glass plate temperature holding chamber 12. The conveyance roller group 3' at this conveyed position is
The glass plate W21 is supported at the side end portions between AB and CD. A first pallet PR1 is arranged below the central position of the glass plate W21. When the glass plate W21 is conveyed to the fixed position of this first pallet PR1, the first rack pinion RP1
moves in the direction of arrow sign F and moves to the first pallet.
Lift PR1 slightly upward and remove glass plate W2.
1 from the transport roller group 3',
Move in the direction of arrow F. During this movement, the side edges AD and BC of the glass plate W21 are heated by the first and second local heaters or the combustible gas flame HT1.
And the side edge of glass plate W21 is heated to 450℃ using HT2.
Local heating to 500°C. The glass plate is heated to 450°C in the first glass plate heating chamber, and the glass plate end surface temperature in this glass plate temperature holding chamber 12 is set to 450°C.
℃, the local heater or combustible gas flames HT1 and HT2 can be omitted.
ガラス板Ｗ２１がラツクピニオンPR１により、
ガラス板Ｗ２２に示す所定の位置まで、搬送され
ると、ラツクピニオンPR１はガラス板Ｗ２１及
びパレツトPR１は置いて原位置に復帰し、次の
ガラス板が搬送されてくるまで待機する。他方、
搬送されたガラス板Ｗ２２にはアーク発生用電極
ER１とER２との間及びER３とER４との間に、
それぞれ図示していないアーク発生用電源が接続
されており、約3000〔Ｖ〕の高電圧を印加すると、
局部的に加熱されて電気抵抗値が減少しているガ
ラス板端面AD間及びBC間に電極ER１とER２と
の間、及び電極ER３とER４との間を通じて0.1
乃至0.5〔Ａ〕程度の電流が流れ、ジユール熱によ
つてガラス板の端面はガラスの流動温度域に達す
る。このようにして、電極ER１とER２との間及
び電極ER３とER４との間の導電通路への導電に
よつて流動温度域の寸前の1000℃乃至1100℃に達
する。この温度に達したガラス板の端面は軟化し
て円滑な表面を形成する。 Glass plate W21 is moved by rack pinion PR1.
When the glass plate W22 is conveyed to a predetermined position, the rack pinion PR1 leaves the glass plate W21 and the pallet PR1 and returns to its original position, waiting until the next glass plate is conveyed. On the other hand,
An electrode for arc generation is placed on the transported glass plate W22.
Between ER1 and ER2 and between ER3 and ER4,
Each is connected to an arc generating power source (not shown), and when a high voltage of approximately 3000 [V] is applied,
0.1 between electrodes ER1 and ER2 and between electrodes ER3 and ER4 between the glass plate end faces AD and BC, where the electrical resistance value is locally heated and reduced.
A current of about 0.5 to 0.5 [A] flows, and the edge surface of the glass plate reaches the glass flow temperature range due to Joule heat. In this way, a temperature of 1000 DEG C. to 1100 DEG C., on the verge of the flow temperature range, is reached by conduction to the conductive paths between electrodes ER1 and ER2 and between electrodes ER3 and ER4. The end face of the glass plate that reaches this temperature softens and forms a smooth surface.
ガラス側端AD間及びBC間のアーク通電ジユ
ール熱軟化成形端面処理を完了したガラス板Ｗ２
２は、第２のラツクピニオンRP２が矢印の符号
Ｈ方向に移動することにより、ガラス板Ｗ２３の
示す所定の位置まで搬送されると、ラツクピニオ
ンRP２はガラス板Ｗ２３及びパレツトPR３を置
いて原位置まで復帰し、次のガラス板が搬送され
てくるまで待機する。他方、搬送されたガラス板
Ｗ２３には、アーク発生用電極ER５とER８との
間及びER６とER７との間に、それぞれ図示して
いないアーク発生用電源が接続されており、約
3000〔Ｖ〕の高電圧を印加すると、局部的に加熱
されて電気抵抗値が減少しているガラス板端面
AB間及びCD間に電極ER５とER８との間及び電
極ER６とER７との間を通じて0.1乃至0.5〔Ａ〕程
度の電流が流れ、前述したガラス板端面AD間及
びBC間と同様に、ガラス板の端面AB間及びCD
間は軟化して円滑な表面を形成する。 Glass plate W2 that has undergone arc current flow between the glass side edges AD and BC and has undergone heat softening molding end face treatment.
2, when the second rack and pinion RP2 is conveyed to the predetermined position indicated by the glass plate W23 by moving in the direction of the arrow mark H, the rack and pinion RP2 leaves the glass plate W23 and the pallet PR3 and returns to the original position. and waits until the next glass plate is delivered. On the other hand, on the transported glass plate W23, arc generating power sources (not shown) are connected between the arc generating electrodes ER5 and ER8 and between the arc generating electrodes ER6 and ER7.
When a high voltage of 3000 [V] is applied, the end surface of the glass plate is locally heated and its electrical resistance value decreases.
A current of about 0.1 to 0.5 [A] flows between the electrodes ER5 and ER8 and between the electrodes ER6 and ER7 between AB and CD. between the end faces AB and CD
The gaps soften to form a smooth surface.
ガラス板全周の端面処理を完了したガラス板Ｗ
２３は、第３のラツクピニオンRP３により矢印
のＪ方向に移動してガラス板Ｗ２３及びパレツト
PR３をガラス板Ｗ２４の位置まで搬送する。こ
のガラス板Ｗ２４の所定位置に達する直前に、パ
レツトPR４は、わずかに下方にも移動するので、
ガラス板Ｗ２４はパレツトPR４から離れて搬送
ローラ３′に支持されると同様に搬送ローラ３′及
び３によつて搬送されてガラス板加熱第２室１３
へ進行する。前述したラツクピニオンRP３は、
ガラス板Ｗ２４及びパレツトPR４を所定の位置
において原位置まで復帰する。また、パレツト
PR４は、図示していない第４のラツクピニオン
によりパレツトPR１の位置まで遊送される。こ
のように４個のパレツトPR１乃至PR４は、４台
のラツクピニオンにより循環しながらガラス板全
周の端面のアーク通電ジユール熱軟化成形を行わ
せる。 Glass plate W with edge treatment completed around the entire circumference of the glass plate
23 is moved in the J direction of the arrow by the third rack and pinion RP3 to remove the glass plate W23 and the pallet.
PR3 is transported to the position of glass plate W24. Immediately before reaching the predetermined position of this glass plate W24, the pallet PR4 also moves slightly downward, so that
When the glass plate W24 is separated from the pallet PR4 and supported by the conveying roller 3', it is similarly conveyed by the conveying rollers 3' and 3 to the glass plate heating second chamber 13.
Proceed to. The rack pinion RP3 mentioned above is
The glass plate W24 and pallet PR4 are returned to their original positions at predetermined positions. Also, palette
PR4 is moved to the position of pallet PR1 by a fourth rack and pinion (not shown). In this manner, the four pallets PR1 to PR4 are circulated by the four rack pinions to perform arc-current-induced heat softening molding on the end faces of the glass plates all around.
なお、ガラス板Ｗ２２及びＷ２３の位置でアー
ク通電ジユール熱軟化成形をするときには、ガラ
ス板は停止又は低速度になり、端面処理をしてい
ないガラス板の搬送速度よりも低下して停滞を生
じるが、ガラス板Ｗ２３からＷ２４の位置まで第
３のラツクピニオンRP３によつて高速度で移動
させることによつて停滞を解消させることができ
る。また、ガラス板端部の局部加熱は、局部加熱
ヒータ又は可燃性ガス炎HT１乃至HT４をガラ
ス板の端面長さよりも長くしておき、ガラス板の
移動中に局部加熱をすれば、特に局部加熱のため
にガラス板を停止させて停滞を生じさせるような
ことはない。 In addition, when performing arc energization gel heat softening molding at the positions of glass plates W22 and W23, the glass plates stop or move at a low speed, and the conveying speed is lower than that of a glass plate without edge treatment, resulting in stagnation. , the stagnation can be eliminated by moving the glass plate W23 to the position W24 at high speed by the third rack and pinion RP3. In addition, local heating at the edge of the glass plate can be achieved by making the local heating heater or combustible gas flame HT1 to HT4 longer than the length of the end face of the glass plate and performing local heating while the glass plate is moving. There is no need to stop the glass plate and cause stagnation.
さらに、パレツト、ラツクパニオンの軸先端部
分、局部加熱源、アーク通電ジユール熱軟化成形
用電極等が高温度の雰囲気中で長時間使用され、
劣化を防ぐために、ガラス板温度保持室１２の雰
囲気の温度は、この保持室においてガラス板の冷
却による割れを生じない程度でなるべく低温、例
えば300℃乃至450℃に維持しておく必要がある。 Furthermore, the pallet, rack panion shaft tip, local heating source, electrode for arc-energized thermoplastic molding, etc. are used for long periods of time in a high-temperature atmosphere.
In order to prevent deterioration, the temperature of the atmosphere in the glass plate temperature holding chamber 12 must be maintained as low as possible, for example, 300° C. to 450° C., to a degree that does not cause cracking of the glass plate due to cooling in this holding chamber.
また、ガラス板温度保持室内での操作機器は必
要最小限とし、パレツト、ラツクピニオンの軸先
端部分はセラミツクスで製作されている。 Additionally, the operating equipment in the glass plate temperature maintenance chamber is kept to a minimum, and the pallet and rack pinion shaft tips are made of ceramics.
本発明によれば、ガラス板端面をダイヤモンド
砥石、研削レベル等の機械的研削方法にくらべ
て、ガラス板端面隅部の欠けやすいこと、面取り
表面に長さ方向に沿つた微細な縞模様が残存しや
すいこと、冷却および研削屑を排出する水流のた
めの作業環境の悪いこと等が改善される他に、特
開昭53−145829号公報に記載された発明が有する
問題点、すなわち通電加熱時の軟化したガラス板
端面に当接した電極のくいこみによるガラス板端
面のくぼみ、電極材料の移転によるガラス板端面
の汚染、電極の消耗が大というような問題点が解
決されるとともに、ガラス板端面の通電加熱を行
う前にガラス板全面を300℃乃至450℃に加熱する
ことと、通電電流のジユール熱による軟化成形を
したガラス板の冷却による割れを防ぐこととを、
強化ガラスの製造工程のガラス板加熱炉の途中で
行うことによつて工程の簡略化による省力化及び
省エネ化を図ることができる。
According to the present invention, compared to mechanical grinding methods such as a diamond grindstone or grinding level, the edges of the glass plate are more likely to chip at the corners, and a fine striped pattern remains along the length on the chamfered surface. In addition to improving the ease of grinding and the poor working environment due to the water flow for cooling and discharging grinding debris, the problem of the invention described in Japanese Patent Application Laid-open No. 53-145829, namely, when heated with electricity, is improved. This solves problems such as denting of the glass plate end face due to the electrode being in contact with the softened glass plate end face, contamination of the glass plate end face due to transfer of electrode material, and large wear of the electrode. The entire surface of the glass plate is heated to 300°C to 450°C before conducting current heating, and the glass plate that has been softened and molded is prevented from cracking due to cooling due to the Joule heat of the current.
By performing this process during the glass plate heating furnace of the tempered glass manufacturing process, labor and energy savings can be achieved by simplifying the process.
第１図は、本発明の強化ガラス板端面アーク通
電ジユール熱軟化成形方法を実施するために、ガ
ラス板加熱第１室１１とガラス板温度保持室１２
とガラス板加熱第２室１３との３室と分離した加
熱炉を示す垂直方向の断面図、第２図は、ガラス
板温度保持室１２の内部でガラス板端面をアーク
通電ジユール熱軟化成形する装置の実施例を示す
水平方向の断面図、第３図は、従来の研削により
処理済のガラス板を強化する加熱炉を示す垂直方
向の断面図である。
１……ガラス板加熱炉、Ｗ１１，Ｗ１２，…，
Ｗ１９……第１加熱炉内のガラス板、Ｗ２１，Ｗ
２２，Ｗ２３，Ｗ２４……ガラス板温度保持室内
のガラス板、Ｗ３１，Ｗ３２……第２加熱炉内の
ガラス板、２ａ，２ｂ，２ｃ…，２ｇ……ガラス
板昇温用第１群ヒータ、２ｈ……ガラス板保温用
ヒータ、２ｉ，２ｊ，…，２ｍ……ガラス板昇温
用第２群ヒータ、３，３′……搬送ローラ群、４
……強制風冷室、５……強制風冷ノズル、１１…
…ガラス板加熱第１室、１２……ガラス板温度保
持室、１３……ガラス板加熱第２室。
FIG. 1 shows a first glass plate heating chamber 11 and a glass plate temperature holding chamber 12 in order to carry out the tempered glass plate end face arc energizing module thermal softening method of the present invention.
FIG. 2 is a vertical sectional view showing a heating furnace separated from three chambers, ie, a glass plate heating second chamber 13, and a glass plate heating chamber 12. FIG. 3 is a horizontal cross-sectional view of an embodiment of the apparatus, and FIG. 3 is a vertical cross-sectional view of a heating furnace for strengthening glass sheets that have been processed by conventional grinding. 1...Glass plate heating furnace, W11, W12,...,
W19...Glass plate in the first heating furnace, W21, W
22, W23, W24...Glass plate in the glass plate temperature holding chamber, W31, W32...Glass plate in the second heating furnace, 2a, 2b, 2c..., 2g...First group heater for heating the glass plate, 2h... Heater for keeping glass plate warm, 2i, 2j,..., 2m... Second group heater for heating glass plate, 3, 3'... Conveying roller group, 4
... Forced air cooling room, 5... Forced air cooling nozzle, 11...
...Glass plate heating chamber 1, 12...Glass plate temperature maintenance chamber, 13...Glass plate heating second chamber.
Claims (1)
に急冷することにより強化ガラスを製作する工程
の途中で、前記ガラス板加熱炉をガラス板加熱第
１室とガラス板温度保持室とガラス板加熱第２室
との少なくとも３室に分離し、ガラス板搬入側の
前記ガラス板加熱第１室でガラス板を300℃乃至
450℃までの所定の温度に加熱する第１の工程と、 前記所定の温度に加熱されたガラス板を前記ガ
ラス板温度保持室においてガラス板の冷却による
割れを生じない程度にガラス板全体を保温してお
いて、ガラス板端面に沿つて局部的に他部分より
も高温でかつガラス板の軟化温度よりも低い温度
に加熱した後に、ガラス板端面に近接して相互に
間隔をおいて配置された複数の電極間に高電圧を
印加して各電極とガラス板端面間にそれぞれアー
ク放電を行わせてガラス板に通電し、そのガラス
板の通電電流のジユール熱でガラス板端面を軟化
成形する第２工程と、 前記端面を軟化成形したガラス板全体をガラス
板加熱第３室において600℃乃至700℃程度の強化
温度域に加熱する第３の工程と、 前記600℃乃至700℃に加熱したガラス板を急冷
してガラス板を強化する第４工程 とから成る強化ガラス板端面アーク通電ジユール
熱軟化成形方法。[Claims] 1. During the process of manufacturing tempered glass by heating the entire glass plate in a glass plate heating furnace and then rapidly cooling it, the glass plate heating furnace is connected to the first glass plate heating chamber and the glass plate temperature is maintained. The glass plate is heated to 300°C or more in the first glass plate heating chamber on the glass plate loading side.
A first step of heating the glass plate to a predetermined temperature of up to 450°C, and keeping the entire glass plate heated to the predetermined temperature in the glass plate temperature holding chamber to an extent that no cracking occurs due to cooling of the glass plate. After heating the glass plate locally along the end face to a temperature higher than other parts and lower than the softening temperature of the glass plate, the glass plate is placed close to the end face of the glass plate and spaced apart from each other. A high voltage is applied between the plurality of electrodes to cause an arc discharge between each electrode and the end face of the glass plate to energize the glass plate, and the end face of the glass plate is softened and shaped by the Joule heat of the current flowing through the glass plate. a second step; a third step of heating the entire glass plate with the end face softened to a strengthening temperature range of about 600°C to 700°C in a third glass plate heating chamber; A method for thermally softening a tempered glass plate by quenching the glass plate to strengthen the glass plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31439286A JPS63166731A (en) | 1986-12-26 | 1986-12-26 | Arc melting of end face of tempered glass plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31439286A JPS63166731A (en) | 1986-12-26 | 1986-12-26 | Arc melting of end face of tempered glass plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63166731A JPS63166731A (en) | 1988-07-09 |
| JPH0475854B2 true JPH0475854B2 (en) | 1992-12-02 |
Family
ID=18052790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31439286A Granted JPS63166731A (en) | 1986-12-26 | 1986-12-26 | Arc melting of end face of tempered glass plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63166731A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997037947A1 (en) * | 1996-04-11 | 1997-10-16 | Nippon Sheet Glass Co., Ltd. | Thermally tempered flat glass and method of finishing edge portions of the same |
| CN103803784A (en) * | 2012-11-06 | 2014-05-21 | 赵享奕 | Simple method for producing tempered glass plate |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6650814B2 (en) * | 2016-04-07 | 2020-02-19 | 川崎重工業株式会社 | Heating equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613659A (en) * | 1979-07-16 | 1981-02-10 | Toshiba Corp | Resistance ballast metal vapor discharge lamp |
| JPS6140608A (en) * | 1984-08-02 | 1986-02-26 | Amada Co Ltd | Controller of robot or the like |
-
1986
- 1986-12-26 JP JP31439286A patent/JPS63166731A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613659A (en) * | 1979-07-16 | 1981-02-10 | Toshiba Corp | Resistance ballast metal vapor discharge lamp |
| JPS6140608A (en) * | 1984-08-02 | 1986-02-26 | Amada Co Ltd | Controller of robot or the like |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997037947A1 (en) * | 1996-04-11 | 1997-10-16 | Nippon Sheet Glass Co., Ltd. | Thermally tempered flat glass and method of finishing edge portions of the same |
| CN103803784A (en) * | 2012-11-06 | 2014-05-21 | 赵享奕 | Simple method for producing tempered glass plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63166731A (en) | 1988-07-09 |
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