WO2019203167A1

WO2019203167A1 - Device and method for forming glass into curved surface shape

Info

Publication number: WO2019203167A1
Application number: PCT/JP2019/016070
Authority: WO
Inventors: 俊之辻井; 隆哲武内; 亮輔武内
Original assignee: 株式会社武内製作所
Priority date: 2018-04-18
Filing date: 2019-04-13
Publication date: 2019-10-24

Abstract

[Problem] The problem addressed by the present invention is to provide a glass curved surface forming device and method thereof for realizing an optical mirror surface after forming as well as realizing a complicated curved surface of the glass. The present invention is a glass curved surface forming device comprising a lower mold equipped with a plurality of cavities, on which a desired curved surface is formed and a glass plate is set and placed under vacuum, and one or a plurality of pressing rollers that press the glass in a desired bending direction, wherein the device is characterized in that, with the glass plate heated to the bending temperature and set on the lower mold, the one or plurality of pressing rollers exert pressing force while rolling along the desired curved surface of the lower mold, and a glass plate of a predetermined curvature is formed in the lower mold by placing a cavity under vacuum immediately after the one or plurality of pressing rollers have rolled.

Description

Apparatus and method for forming glass into curved shape

The present invention relates to an apparatus and a method for molding glass into a curved shape, and more particularly to an apparatus and a method for molding glass into a curved shape for realizing a complicated curved shape.

With the progress of multimedia, various shapes and curvatures are required for glass used in display devices. In particular, an information display device for satisfying an HMI (Human Machine Interface) is provided in an automobile. However, an in-vehicle navigation system, an audio device, and the like are remarkably widespread, and images and images provided by these devices are remarkable. There is an in-vehicle display device that displays In addition, there is a so-called head-up display (HUD) device configured to transmit and illuminate a liquid crystal display element with a backlight. However, HUD itself is evolving as a screen display body having a multifunctional role. When such an in-vehicle display device or the like is realized with thin glass, a more complicated curved surface is required. In addition to realizing a complicated curved surface of glass, an optical mirror surface after molding is required.

Generally, as a method of forming glass for automobiles, there are methods such as heating the glass to a temperature higher than the softening point and bending it by its own weight or pressing, or by its own weight bending or press bending. In particular, press molding is used for molding deeply curved glass or horseshoe-shaped glass. The invention according to Patent Document 1 calculates the stress generated in the glass plate by press bending in the press bending method using press molding, and the stress obtained by the stress calculation is in-plane compressive stress. A method of press bending a glass plate under a press bending condition in which the in-plane compressive stress is equal to or less than an allowable value calculated by buckling theory is proposed. Although such a molding method is excellent in production efficiency, it is particularly difficult to realize a complicated curved surface of glass, and technical problems remain when it becomes a highly accurate optical mirror surface. In addition, if the upper and lower molds are pressed strongly, it may be possible to achieve a complicated curved surface of the glass, but the glass after molding becomes white and cloudy, and the glass periphery often has wrinkles, and the glass surface There is a problem that the realization of a high-precision optical mirror surface will not be continued unless polishing is performed over a longer time than after normal pressing. Furthermore, it is very expensive to create a mold for molding glass for a vehicle-mounted display device called CID (Center Information Display) or Cluster, and it is difficult to cope with the curved surface of the glass.

As another method, a bending method using a roller assembly is known. The invention according to Patent Document 2 proposes a method of bending a glass plate by conveying the glass plate heated to near the softening point in a heating furnace with a roller conveyor composed of a plurality of curved rollers. According to this method, since the softened glass plate hangs down by its own weight, the glass plate is bent so as to follow the curvature of the roller. In this case, the glass plate is bent and formed in a direction orthogonal to the conveying direction. The invention according to Patent Literature 3 proposes that the roller assembly according to Patent Literature 2 bends the glass plate by pressing the conveyance roller while moving the conveyance roller up and down as the glass is conveyed.

JP 2005-154164 A U.S. Pat. No. 4,123,246 Japanese Patent Laid-Open No. 2000-72460

However, in the method of Patent Document 1, it is necessary to replace the roller with a curvature corresponding to the model for each model, and it takes time to replace the roller, and it is necessary to prepare a roller with a curvature required for each model. In addition, streaky roller distortion due to contact of the roller with the glass plate is formed in the vertical direction in the assembled state, and there is a problem that streaky distortion due to the roller is easily noticeable. Moreover, in the method of

patent document

2 or 3, in the case of large sized glass forming, it is necessary to move a huge number of conveyance rollers up and down, and control becomes complicated and there is a concern about generation of scratches on the glass plate. There is a problem. Furthermore, it is difficult for the methods of Patent Documents 1 to 3 to cope with the slightly curved surface of a slightly large glass used in an in-vehicle display device.
In view of such a problem, an object of the present invention is to propose a glass curved surface forming apparatus and a method for realizing an optical mirror surface after forming, as well as realizing a complicated curved surface of glass.

In order to solve the above problems, the present invention provides a lower mold having a plurality of cavities for placing a glass plate on which a desired curved surface is formed and evacuating, and pressurizing the glass plate in a desired bending direction. Or a glass curved surface forming apparatus comprising a plurality of pressing rollers, wherein the one or more pressing rollers have a desired curved surface of the lower mold in a state where the glass plate heated to the bending temperature is placed on the lower mold. The glass plate is formed to have a predetermined curvature by evacuating the cavity immediately after one or more pressing rollers roll in the lower die while rolling along . The lower mold includes a first evacuation region for fixing the glass plate and a second evacuation region in which one or a plurality of pressing rollers roll on the surface of the glass plate, and the glass plate is a first vacuum. While being fixed to the pulling area, one or more pressing rollers pressurize while rolling the surface of the glass plate along the curved surface of the lower mold, and immediately after one or more pressing rollers roll in the lower mold It is preferable that the second evacuation region is formed into a predetermined curvature by evacuation. Further, the one or more pressing rollers may press the curvature of the plurality of curved surfaces of the glass plate while rolling a plurality of times toward the bending center of the plurality of curved surfaces.

Note that the lower die moves, and the rolling direction of the one or more pressing rollers is preferably opposite to the moving direction of the lower die. In addition, the one or more pressing rollers may be designed to move up and down via a hydraulic telescopic member or a link member. Furthermore, it is preferable that the pressing roller is supported by a support member via a roller shaft, and the levelness of the pressing roller can be finely adjusted by raising and lowering the left and right rods included in the roller shaft.

Further, the glass curved surface forming method according to the present invention includes a lower mold having a plurality of cavities on which a desired curved surface is formed and a glass plate is placed and vacuumed, and the glass plate provided above the lower die. In a glass curved surface forming apparatus comprising one or a plurality of pressing rollers that pressurize in a desired bending direction, a step of placing the glass plate on the lower mold, and a molding in which the glass plate is vacuumed and fixed to the lower mold and heated. The preheating step and the glass plate that has been transported after heating are subjected to pressure applied to the curved surface while one or more pressing rollers roll along the curved surface of the lower mold, Alternatively, it is characterized by comprising a molding step of forming a predetermined curvature by evacuating the cavity immediately after the plurality of pressing rollers roll.
The lower mold includes a first evacuation region for fixing the glass plate, and a second evacuation region in which one or more pressing rollers roll on the surface of the glass plate, and the glass plate is a first vacuum. While being fixed to the pulling area, one or more pressing rollers pressurize while rolling the surface of the glass plate along the curved surface of the lower mold, and immediately after one or more pressing rollers roll in the lower mold The second evacuation region is formed into a predetermined curvature by evacuation.
Furthermore, it is preferable that the one or more pressing rollers pressurize the curvature of the plurality of curved surfaces of the glass while rolling a plurality of times toward the bending center of the plurality of curved surfaces.

In addition, prior to the above-described glass curved surface forming step, an analysis step for performing curved surface analysis of the shape of the mold, a place where one or a plurality of pressing rollers roll based on the result of the curved surface analysis, a rolling order, It is preferable that a determination step for determining the adjustment of the level of the one or more pressing rollers is provided in advance. Furthermore, it is preferable that the determination step described above can adjust the linkage with the moving speed of the lower mold.

The glass curved surface forming method and apparatus according to the present invention can realize a slightly complicated curved surface of glass and an optical mirror surface after molding. Further, since the thickness of the glass plate and the bending shape of the glass plate are various, the bending by the pressing roller is flexible, and more advantageous in cost than the press forming by the upper die and the lower die.

It is a schematic block diagram which shows the curved surface shaping | molding apparatus 100 of the glass which concerns on Example 1 of this invention. It is a figure which shows a part of roller apparatus 20 which concerns on Example 1 of this invention. It is the glass (a) perspective view shape | molded in Example 1 of this invention, (b) Side view, (c) It is a figure which shows a bending direction. It is a figure which shows simply rolling and the press of the press roller 21 in the curved surface shaping | molding of the glass which concerns on Example 1 of this invention. FIG. 5 is a diagram simply showing rolling and pressing of a pressing roller 21 subsequent to FIG. 4 in glass curved surface forming according to Example 1 of the present invention. It is a flowchart of the curved surface shaping | molding method of the glass which concerns on Example 1 of this invention. It is a figure which shows the mode of the curved surface shaping | molding of glass along the flowchart shown in FIG. It is a figure which shows the mode of the curved surface shaping | molding of the glass following FIG. 7 along the flowchart shown in FIG. It is a figure which shows the shape | molded glass with a some bending direction. It is the glass (a) perspective view shape | molded in Example 2 of this invention, (b) Side view, (c) It is a figure which shows a bending direction. It is a schematic block diagram which shows the curved surface shaping | molding apparatus 200 of the glass which concerns on Example 2 of this invention. It is a figure which shows rotation of the press roller 51 which concerns on Example 2 of this invention. It is a flowchart of the curved surface shaping | molding method of the glass which concerns on Example 2 of this invention. 6 is a front view showing the shape of a mold used in an experiment according to Example 3. FIG. It is a flowchart of the curved surface shaping | molding method of the glass which concerns on Example 3 of this invention. It is a figure which shows the mode of the curved surface shaping | molding of the glass in the experiment which concerns on Example 3 along the flowchart shown in FIG. It is a figure which shows the mode of the curved surface shaping | molding of the glass following FIG. 15 along the flowchart shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same number is attached | subjected to the same part and the overlapping description is abbreviate | omitted. It should also be noted that the drawings may be exaggerated to understand the present invention and are not necessarily shown to scale. In addition, this invention is not limited to the Example shown below.

Example 1 will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram illustrating a glass curved surface forming apparatus 100 according to a first embodiment of the present invention. This will be described in detail with reference to FIG. The glass curved surface forming apparatus 100 is configured by connecting a heating unit 1 and a forming unit 2 to each other, and is divided by side walls that can be freely opened and closed. Since the side wall S is openable and closable, the inside of each part is appropriately chambered, and has a role of preventing a rapid temperature drop due to outside air. Note that the side wall S may be eliminated, and the heating unit 1 and the molding unit 2 may be made into one space. However, when the heating part 1 and the molding part 2 are made into one space, it is necessary to consider that it becomes difficult to keep the temperature in the heating part 1 at a predetermined temperature because the space becomes wide. In order to stabilize the temperature of 1, it is preferable to provide the side wall S.

Next, main devices provided in each unit will be described. The heating unit 1 includes a heater 11 and a heater support member 12. The heater 11 is supported by a heater support member 12 and may be configured to be driven up and down by a hydraulic cylinder and servo control. Similarly, the molding unit 2 may be configured such that the roller device 20 is installed on the base 29 and is driven up and down by a hydraulic cylinder and servo control. And in order to shape | mold glass, the lower mold | type 31 which mounts the glass plate G can be mounted on the lower mold | type transfer vehicle 32, and the heating part 1 and the shaping | molding part 2 can be moved. The material of the lower mold 31 is preferably metal or ceramics. However, in the case of ceramics, there is fire resistance, excellent specularity after processing, high temperature and good releasability from glass. preferable.

FIG. 2 is a diagram illustrating a part of the roller device 20 according to the first embodiment of the present invention. The roller device 20 will be described in detail with reference to FIGS. The roller device 20 generally includes a pressing roller 21, a roller shaft 22, an arm 23, and a robot housing base 24. The pressing roller 21 is rotatably supported by a roller shaft 22 and is attached to an arm 23. The arm 23 is housed and mounted in a robot housing base 24 and moves up and down by a sliding cylinder. Servo motor controls important pressure, speed and alignment as molding conditions. The robot housing base 24 is attached to a base 29 provided on the ceiling of the molding part 2, and the glass placed on a lower mold 31 described later while the pressing roller 21 rolls as the arm 23 moves up and down. Press the plate G. In the first embodiment of the present invention, the attachment is fixed, but the robot housing base 24 may be designed so that the lower surface of the base 29 can move freely. Further, the level of the pressing roller 21 may be finely adjusted by raising and lowering the left and right rods of the roller shaft 22 attached to the arm 23. The arm 23 may be operated by a link member.

The material of the pressure roller 21 may be heat resistant metal or ceramic. In the first embodiment, the pressing roller 21 is a cylindrical body, but may be a spherical body or a conical body.

Refer to FIG. 3A is a perspective view of the glass Gf1 formed in Example 1 of the present invention, FIG. 3B is a side view, and FIG. 3C is a plan view showing a bending direction. The molded glass Gf1 according to the first embodiment of the present invention has a downward bent shape in the length direction toward one end of the glass plate. FIG. 3C is a plan view, and A1 is an arrow indicating a bending direction, and the above-described pressing roller 21 rolls in the bending direction A1 while the glass plate G placed on the lower mold 31 is predetermined. Press the part. Of course, the lower mold 31 has a shape designed by the bending direction of the molded glass Gf1.

Refer to FIG. 4 and FIG. 4 and 5 are diagrams simply showing rolling and pressing of the pressing roller 21 in the curved surface forming of the glass according to the first embodiment of the present invention, and (a) to (c) are shown in time series. FIG. 5 (a) should be understood as a diagram showing a state performed after FIG. 4 (c).

FIG. 4A shows a state in which the glass plate G is heated by the heater 11 while being placed on the lower mold 31 in the heating unit 1. In Example 1, a near infrared heater is used as the heater 11 so that the temperature is gradually raised to the vicinity of the glass softening point in about 4 minutes. When the glass plate G is heated, the heater 11 is raised and the shutter S is opened. If it does so, the lower mold | type transfer vehicle 32 which mounted the heated glass plate G and the lower mold | type 31 will move to the shaping | molding part 2 (FIG.4 (b)). When the lower mold transfer wheel 32 starts to move to the molding unit 2, the arm 23 of the roller device 20 descends, the pressing roller 21 stands by slightly above the glass plate G, and the lower mold is detected when the sensor detects the molding start location. The transfer vehicle 32 stops and the pressing roller 21 is pressed against the glass plate G (FIG. 4C). When the pressing roller 21 is pressed against the glass plate G, the lower mold transfer vehicle 32 moves again in the same direction, and the pressing roller 21 rolls in a direction opposite to the moving direction of the lower mold transfer vehicle 32, and a predetermined The glass plate G is pressed with pressure (FIGS. 5A and 5B). When the sensor detects the molding end point, the lower mold transfer vehicle 32 stops (FIG. 5C). And the arm 23 raises and the press roller 21 leaves | separates from the shape | molded glass. In addition, when shaping | molding is inadequate, the lower mold | type transfer vehicle 32 returns to a shaping | molding start location, and the above-mentioned shaping | molding procedure is repeated.

FIG. 6 is a flowchart of the glass curved surface forming method according to the first embodiment of the present invention. FIGS. 7 and 8 are diagrams showing in detail the curved surface molding of the glass along the flowchart shown in FIG. The lower mold 31 includes a cavity region (first evacuation region # 1, # 3, second evacuation region # 4, # 5, # 6), and a vacuum is applied to the glass plate G through the cavity. The glass plate G can be pulled into the cavity and brought into contact with the molding surface to apply and position and fix the glass plate G. Further, in the molding part 2, the base 29 is provided with an end vacuum support part # 2 capable of evacuating one end of the glass plate G. The end vacuum support part # 2 is movable.

Details of the glass forming method will be described with reference to FIGS. First, the glass plate G is placed on a predetermined position of the lower mold 31 (S11). And cavity area | region # 1 and edge part vacuum support part # 2 are evacuated, and the glass plate G is fixed (S12). In the heating part 1, the heater support part 12 descends to bring the heater 11 closer to the glass plate G and mainly heat the # 1 area and the # 3 area (S13). And # 3 area | region and edge part vacuum support part # 2 are evacuated, the glass plate G is fixed, and # 4 area | region, # 5 area | region, and # 6 area | region are heated gradually (S14). Thereafter, as shown in FIGS. 4 and 5, the heater 11 is raised and the shutter S is opened (not shown). Then, the lower mold transfer wheel 32 on which the heated glass plate G and the lower mold 31 are placed moves to the molding unit 2. At this time, evacuation to the # 1 region and the # 3 region is suppressed, and the heat retaining state is maintained. When the lower mold transfer wheel 32 starts to move to the molding unit 2, the arm 23 of the roller device 20 descends, the pressing roller 21 stands by slightly above the glass plate G, and the lower mold is detected when the sensor detects the molding start location. The transfer vehicle 32 stops (not shown), the pressing roller 21 is pressed against the # 4 region of the glass plate G, and then the vacuum transfer in the # 4 region is fixed and the lower mold transfer vehicle 32 is moved. The pressing roller 21 starts rolling and pressing (S15). When the pressure roller 21 arrives in the vicinity of the # 5 area due to further movement of the lower mold transfer wheel 32, the evacuation of the end vacuum support section # 2 is released. At this time, the # 5 region and the # 6 region remain evacuated. And if a sensor detects the completion | finish location of shaping | molding, the lower mold | type transfer vehicle 32 will stop and the press roller 21 will finish rolling and a press (S16). In addition, when shaping | molding is inadequate, the lower mold | type transfer vehicle 32 returns to a shaping | molding start location, and the above-mentioned shaping | molding procedure is repeated.

In the first embodiment, one roller device 20 includes one pressing roller 21, but a plurality of roller devices may be designed to include a plurality of pressing rollers.

Example 2 will be described in detail with reference to the drawings.

FIG. 9 is a diagram illustrating glass Gf2 (a) and Gf3 (b) formed with a plurality of bending directions. As described above, when an automobile HUD device is realized with thin glass, a more complicated curved surface is required. When it becomes a complicated curved surface, rolling of the pressing roller in a plurality of bending directions is required. In the case of FIG. 9A, the bending directions are two of A2 and A3, and in the case of FIG. 9B, the bending directions are four directions of A4, A5, A6, and A7. As described above, there are various bending directions in the molded glass, and if it is not only two-dimensional but also three-dimensional, the rolling direction and the pressing direction of the pressing roller must freely correspond to the movement along the double curved surface. Also in the second embodiment, the pressing roller 51 employs a cylindrical body, but a spherical body or a conical body may be employed. The material of the pressing roller 51 may be a heat resistant metal or ceramic.

Refer to FIG. 10A is a perspective view of the glass Gf3 formed in Example 2 of the present invention, FIG. 10B is a side view, and FIG. 10C is a plan view showing a bending direction. The shaped glass Gf3 according to Example 2 of the present invention has a shape that is bent downward in the length direction from the center of the glass plate toward one end, and the upper and lower ends of one end in the plan view are also bent in the direction of the arrow. Is bent downward in the direction of the arrow. FIG. 10 (c) is a plan view, and A4, A5, A6, and A7 are arrows indicating the bending direction, and the pressing roller 41 described above is rolling toward the bending directions A4, A5, A6, and A7, respectively. Then, a predetermined portion of the glass plate G placed on the lower mold 61 is pressed. Naturally, the lower mold 61 has a shape designed by the bending direction of the molded glass Gf3.

FIG. 11 is a schematic configuration diagram showing a glass curved surface forming apparatus 200 according to Embodiment 2 of the present invention. The glass curved surface forming apparatus 200 includes a heating unit 4 and a forming unit 5 connected to each other, and is divided by an openable / closable side wall S. Since the side wall S is openable and closable, the inside of each part is appropriately chambered, and has a role of preventing a rapid temperature drop due to outside air. In addition, main devices included in each unit will be described. The heating unit 4 includes a heater 41 and a heater support member 42. The heater 41 is supported by a heater support member 42 and may be configured to be driven up and down by a hydraulic cylinder and servo control. Similarly, the molding unit 5 may be configured such that the roller device 50 is installed on the base 59 and is driven up and down by a hydraulic cylinder and servo control. And in order to shape | mold glass, the lower mold | type 61 which mounts the glass plate G can be mounted on the lower mold | type transfer vehicle 62, and the heating part 4 and the shaping | molding part 5 can be moved. The material of the lower mold 61 is preferably metal or ceramic.

The roller device 50 generally includes a pressing roller 51, a roller shaft 52, an arm 53, and a robot housing base 54. The pressing roller 51 is rotatably supported by a roller shaft 52 and is attached to an arm 53. The arm 53 is housed and mounted in a robot housing base 54 and moves up and down by a sliding cylinder. The arm 53 is preferably provided with a hinge 55 so that the pressing roller 51 can freely roll on a double curved surface. As a molding condition, important control of pressure, speed, and alignment is performed by a servo motor. The shape data of the curved surface of the lower mold 61 is analyzed in advance by a computer. The robot housing base 54 is attached to a base 59 provided on the ceiling of the molding unit 5, and the arm 53 moves up and down to press the glass plate G placed on the lower mold 61 while the pressing roller 51 rolls. To do. In the second embodiment of the present invention, this attachment is fixed, but it may be designed so that the robot housing base 54 can freely move on the lower surface of the base 59.

Refer to FIG. FIG. 12 is a diagram illustrating the rotation of the pressing roller 51 according to the second embodiment of the present invention. As shown in FIG. 12 (a), the arm 53 can be rotated 360 degrees by a hinge 55, so that the pressing roller 51 can move not only to the left and right but also to adjust the level. Moreover, as shown in FIG.12 (b), it is possible to change direction to the bending center of a some curved surface.

Refer to FIG. FIG. 13 is a flowchart of the curved glass surface forming method according to the second embodiment of the present invention. The curved surface forming method for glass according to the second embodiment of the present invention includes an analysis step (S21) for analyzing the shape of the mold in a curved surface prior to the heating step (S24) and the curved surface forming step (S25), and the curved surface analysis. Based on the result, a determination step (S22) for determining a place where the pressing roller rolls, a rolling order, and adjustment of the level of the pressing roller is provided in advance. In addition, in order to analyze the shape data of the curved surface of the lower mold 61 in advance, it is preferable to grasp the shape of the curved surface from the Gaussian curvature and the average curvature. Here, the Gaussian curvature is determined by the product of the vertical and horizontal curvatures of the curved surface, and the average curvature is determined by the average of the vertical and horizontal curvatures of the curved surface. The curved surface analysis may be calculated using CAD data when the lower mold is manufactured.

In the second embodiment, as in the first embodiment, one roller device 50 includes one pressing roller 51, but a plurality of roller devices may be designed to include a plurality of pressing rollers. In this case, it should be noted that in order to control the rolling / pressing of the plurality of pressing rollers 51, it is necessary to link the speed control data of the lower die 61 and the vertical movement control data of the plurality of pressing rollers 51. .

Example 3 will be described in detail with reference to the drawings. FIG. 14 is a front view showing the shape of the mold used in the experiment according to Example 3. FIG. FIG. 15 is a flowchart of the curved glass surface forming method according to the third embodiment of the present invention. Further, FIGS. 16 and 17 are diagrams showing in detail the curved surface molding of the glass according to Example 3. FIG.

The glass forming method according to Example 3 was conducted in the applicant's headquarters factory (1-6-14 Hasesehoncho, Amagasaki City, Hyogo Pref., Takeuchi Seisakusho Co., Ltd.) with employees present. As an experimental result, the molding method of the present invention used an S-shaped lower die 91 made of SUS shown in FIG. 14 and experimented with three types of molding methods, that is, only the dead weight, vacuum drawing, roller and vacuum drawing. The glass forming method according to Example 3 is almost the same as the procedure shown in Example 1.
Hereinafter, the measurement results of the experiment will be described in detail. For the experiment, the following basic conditions were the same, and only the roller was changed in pressure and the change was observed. In addition, about the roller, the thing made from SUS which carried out PVD coating was used. And R of the bending glass after the shaping | molding which concerns on the (a) part (100R) shown in FIG. 14 was measured with the contour shape measuring device, and it evaluated by either (circle), (triangle | delta), and x by the shape error. In the evaluation, ○ is within 3% error, Δ is 4-5% error, and x is 6% or more.
(Basic conditions)
Mold: S-shaped lower mold made of SUS Temperature: 520 degrees Celsius Glass thickness: Blue plate 1.1 mm
Preheating (batch furnace) time: 1 minute heating at 400 ° C (IR) time: 100 seconds Vacuum pressure: -80 kPa
(Experimental equipment) Thin glass curved surface molding machine / CSGM-III
(Molding process)
Preheating (batch furnace) → Input → Move to heating position → Heating (IR) → Roller molding → Move to extraction position → Extraction

Referring to FIGS. 15, 16 and 17, a detailed description will be given of the experiment of the glass curved surface forming according to Example 3. FIG. The lower die 91 includes cavity regions (first vacuuming regions # 71, # 73, second vacuuming regions # 74, # 75, # 76), and the glass plate G is vacuumed via the cavity C. The glass plate G can be pulled into the cavity C and brought into contact with the molding surface so that the glass plate G is positioned and fixed. Further, in the forming part, an end vacuum support part # 72 capable of evacuating one end of the glass plate G is provided in the base. The end vacuum support portion # 72 is movable.

First, the glass plate G is placed on a predetermined position of the lower mold 91 (S31). And cavity area | region # 71 and edge part vacuum support part # 72 are evacuated, and the glass plate G is fixed (S32). In the heating part 1, the heater support part 12 descends to bring the heater 11 closer to the glass plate G and mainly heat the # 71 region and the # 73 region (S33). Then, since the # 71 area and the # 73 area are slightly gentle areas of the lower mold 91, the glass plate G is landed on the lower mold 91 by its own weight, and the landed # 73 area and the end vacuum support section # 72 are connected to each other. Vacuum is applied to fix the glass plate G. Subsequently, the # 74 area, # 75 area, and # 76 area are gradually heated (S34). Thereafter, the heater is left as it is, and the evacuation to the # 71 region and the # 73 region is suppressed, and the heat insulation state is maintained. When the lower mold transfer vehicle starts to move to the molding part, the arm of the roller device descends, the pressing roller 81 stands by a little above the glass plate G, and when the sensor detects the molding start position, the lower mold transfer vehicle is The pressing roller 81 is pressed against the # 74 area of the glass plate G, and then the pressure roller 81 is moved in accordance with the movement of the lower transfer vehicle while the vacuuming of the # 74 area is fixed. Rolling and pressing are started (S35). When the pressure roller 81 arrives in the vicinity of the # 75 region due to further movement of the lower mold transfer vehicle, the vacuum suction of the end vacuum support portion # 72 is released. At this time, the # 75 region and the # 76 region remain evacuated. And if a sensor detects the completion | finish location of a shaping | molding, a lower mold | type transfer vehicle will stop and the press roller 81 will finish rolling and a press (S36). In addition, when shaping | molding is inadequate, a lower mold | type transfer vehicle returns to a shaping | molding start location, and the above-mentioned shaping | molding procedure is repeated.

As a result of the experiment according to Example 3, the following could be confirmed. First, in the case of only its own weight, a desired shape cannot be formed without any assistance when the glass is bent. In the case of evacuation, although a certain shape can be formed, it is bent only by its own weight until evacuation starts, and it is completely aligned with the lower mold by simply drawing glass that is soft and bent in vacuum. It ’s difficult. And when softened by its own weight and the glass bends, it was found that it became possible to achieve the desired molding by evacuating in order to keep the state by following the lower mold by assisting with the roller. .

While the preferred embodiments of the glass curved surface forming apparatus and method according to the present invention have been illustrated and described above, it is understood that various modifications can be made without departing from the technical scope of the present invention. Will.

The glass curved surface forming method and apparatus according to the present invention realizes a curved surface having a high quality surface property and an optical mirror surface, so that the resulting molded glass is widely used for in-vehicle display devices and the like. Can do.

DESCRIPTION OF SYMBOLS 100 200 Glass curved surface shaping | molding apparatus 14 Heating part 11 41 Heater 12 42 Heater support arm 2 5 Molding part 20 50 Roller device 21 51 81 Pressing roller 22 52 Roller shaft 23 53 Arm 24 54 Robo housing base 55 Hinge 29 59 Substrate 31 61 91 Lower mold 3 2 62 Lower mold transfer vehicle # 1 # 3 First vacuum area # 4 # 5 # 6 Second vacuum area # 71 # 73 First vacuum area # 74 # 75 # 76 Second vacuum area G Glass plate C Cavity Gf1 Gf2 Gf3 Gf4 Molded glass

Claims

Glass curved surface molding comprising a lower mold having a plurality of cavities for placing a glass plate on which a desired curved surface is formed and evacuating, and one or a plurality of pressing rollers for pressing the glass plate in a desired bending direction. A device,
In a state where the glass plate heated to the bending temperature is placed on the lower mold, the one or more pressing rollers act on the lower mold while rolling along the desired curved surface. In addition, a glass curved surface forming apparatus characterized in that the glass plate is formed into a predetermined curvature by evacuating the cavity immediately after the one or more pressing rollers roll in the lower mold.
The lower mold includes a first evacuation region for fixing the glass plate, and a second evacuation region in which the one or more pressing rollers roll on the surface of the glass plate,
While the glass plate is fixed to the first evacuation region, the one or more pressing rollers pressurize while rolling the surface of the glass plate along the curved surface of the lower mold, and the lower The glass curved surface forming apparatus according to claim 1, wherein the second evacuation region immediately after the one or more pressing rollers roll in the mold is evacuated to form a predetermined curvature.
3. The pressurizing roller according to claim 1, wherein the one or a plurality of pressing rollers pressurize the curvature of the plurality of curved surfaces of the glass plate while performing a plurality of rotations toward a bending center of the plurality of curved surfaces. Glass curved surface forming equipment.
The glass according to any one of claims 1 to 3, wherein the lower mold moves, and a rolling direction of the one or more pressing rollers is opposite to a moving direction of the lower mold. Curved surface forming device.
The glass curved surface forming apparatus according to any one of claims 1 to 4, wherein the one or more pressing rollers are moved up and down via a hydraulic telescopic member or a link member.
6. The pressure roller is supported by a support member via a roller shaft, and the level of the pressure roller is finely adjusted by raising and lowering the left and right rods of the roller shaft. The glass curved surface shaping | molding apparatus of any one of Claims.
A lower mold having a plurality of cavities for forming a desired curved surface, placing a glass plate, and evacuating, and one or a plurality of presses provided above the lower die to press the glass plate in a desired bending direction A glass curved surface forming apparatus comprising a roller,
Placing the glass plate on the lower mold;
A pre-molding heating step in which the glass plate is evacuated and fixed to the lower mold and heated;
The one or more pressing rollers act on the glass plate conveyed after finishing the heating while rolling along the curved surface of the lower mold, and in the lower mold, Alternatively, a molding step for molding the cavity immediately after a plurality of pressing rollers rolls into a predetermined curvature by evacuating the cavity,
A glass curved surface forming method characterized by comprising:
The lower mold includes a first evacuation region for fixing the glass plate, and a second evacuation region in which the one or more pressing rollers roll on the surface of the glass plate,
While the glass plate is fixed to the first evacuation region, the one or more pressing rollers pressurize while rolling the surface of the glass plate along the curved surface of the lower mold, and the lower The glass curved surface forming method according to claim 7, wherein the second evacuation region immediately after the one or more pressing rollers roll in the mold is evacuated to form a predetermined curvature.
The one or more pressing rollers pressurize the curvature of the curved surfaces of the glass while rolling a plurality of times toward the bending center of the curved surfaces. The method for forming a curved glass surface according to claim 1.
Prior to the curved surface forming step of the glass, based on the result of the curved surface analysis, the analysis step of analyzing the shape of the mold, the place where the one or more pressing rollers roll, the rolling order, the pressing A glass curved surface forming method according to any one of claims 7 to 9, further comprising a determining step for determining adjustment of the level of the roller.
Furthermore, the said determination process adjusts interlocking | linkage with the moving speed of the said lower mold | type, The glass curved surface shaping | molding method of Claim 10 characterized by the above-mentioned.