JP2020062838A - Molded body manufacturing method and manufacturing apparatus - Google Patents

Abstract

To provide a technique capable of manufacturing a molded body whose end part is bent, more efficiently.SOLUTION: A method of bending an end part of a work to produce a molded body having the end part bent includes: an arrangement step of a heat shield plate in which the heat shield plate that suppresses heating of a portion other than the end part of the work is brought into contact with a bending position of the work; a heating step of heating the end part of the work with which the heat shield plate abuts with an infrared heater while heating the end part with a hot air heater; and a bending step of bending the end part of the heated work.SELECTED DRAWING: Figure 3A

Description

  TECHNICAL FIELD The present invention relates to a method and an apparatus for manufacturing a molded body, and more particularly to a method and a device for bending an end portion of a work to manufacture a molded body having an end portion bent.

  A molded ceiling formed of a molded body containing a sheet material such as a resin sheet is often mounted on the interior surface side of a roof panel of a vehicle such as an automobile as an interior material (ceiling lining) to be attached to the ceiling. Since this molded ceiling is formed in a size and shape that covers the indoor surface side of the roof panel, in the case of a molded ceiling that is mounted on a vehicle equipped with a sunroof, an opening for forming the sunroof is formed. . Since the lower side of the peripheral edge of the opening of the molded ceiling is exposed to the room, processing such as bending is performed from the viewpoint of design.

  For example, in Patent Document 1, a heating step of heating the end portion of the work by a heating unit, a primary bending step of bending the end portion of the work substantially vertically by pressing the first block, and a second block An invention relating to a method for manufacturing a molded article, which includes a secondary bending step of further bending and folding back the portion that is bent substantially vertically by pressing, is disclosed. Patent Document 1 describes, as the heating means, a heating member such as a heater block that directly contacts and heats a work.

  Further, for example, in Patent Document 2, after the hot air of a predetermined temperature is blown from a hot air nozzle to the back surface side of the winding strip provided along the peripheral edge of the opening of the laminated molded product having a predetermined configuration, the winding strip is provided. An invention relating to an end treatment method for a laminated molded article is disclosed, in which is wound on the back side by the action of a winding piece.

JP, 2010-52400, A JP, 2013-52563, A

  By the techniques disclosed in the above-mentioned Patent Documents 1 and 2, it is possible to manufacture a molded product having an end portion that is subjected to a bending process (hereinafter, also including a winding process) with a clean finish. On the other hand, in the technique of manufacturing the molded body in which the end portion of the work is bent and the end portion is bent, there is a demand for a technology that can be manufactured more efficiently.

  Therefore, the present invention is intended to provide a technique capable of manufacturing a molded body whose end portion is bent more efficiently.

  The present invention is a method for manufacturing a molded product in which the end portion of a work is bent, and the end portion is bent, and a portion other than the end portion of the work is heated at a bending position of the work. The step of arranging the heat shields to bring the heat shields into contact with the heat shields, and the heating of the end portions of the workpieces contacted with the heat shields by the infrared heater while heating them by the hot air heater. There is provided a method for producing a molded body, which includes a step and a bending step of bending the end portion of the heated work.

  Further, the present invention is an apparatus for manufacturing a molded product having an end portion of a workpiece bent, to produce a molded body, the heating unit heating the end portion of the workpiece, and the heating unit. A heat shield unit including a heat shield plate that suppresses heating of a portion other than the end portion of the work by contacting the bending position of the work during heating by the heating unit; A hot-air heater that heats the end of the work with which the heat shield plate abuts, and an infrared heater that heats the end of the work in parallel with the heating by the hot-air heater, an apparatus for manufacturing a molded body, provide.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can manufacture the molded object by which the edge part was bent further efficiently can be provided.

It is explanatory drawing which shows schematic structure of an example of the manufacturing apparatus of one Embodiment of this invention. It is explanatory drawing which shows schematic structure of the heating unit in the manufacturing apparatus shown in FIG. It is a figure for demonstrating operation | movement of the manufacturing apparatus shown in FIG. 1, and is a figure showing the state at the time of heating the edge part of a workpiece | work. It is a figure for demonstrating operation | movement of the manufacturing apparatus after the state shown to FIG. 3A, and a figure showing the state which is going to bend the edge part of the heated workpiece | work. It is a figure for demonstrating operation | movement of the manufacturing apparatus after the state shown in FIG. 3B, Comprising: It is a figure showing the state which is made to support and bend | folds the edge part of a workpiece | work. It is a figure for demonstrating operation | movement of the manufacturing apparatus after the state shown in FIG. 3C, Comprising: It is a figure showing the state which has bent the edge part further and is folded back.

  Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.

<Manufacturing method>
A method for manufacturing a molded article according to an embodiment of the present invention (hereinafter, also referred to as “manufacturing method according to the present embodiment”) is performed by bending an end portion of a work and bending the end portion. It is a method for producing a molded body. The manufacturing method of the present embodiment includes a step of disposing a heat shield plate (a step of disposing the heat shield plate), a step of heating an end portion of the work (heating step), and a bending process of the end portion of the heated work. The process (bending process) is included.

  The "workpiece" means an object to be processed in the manufacturing method of the present embodiment, and is a product in a state before the bending process of the molded body obtained by the manufacturing method of the present embodiment. The work is not particularly limited as long as the end portion is softened by the heating process and is easily bent. As a suitable work, a sheet material containing a synthetic resin can be cited. The sheet material includes a film, and the thickness of the sheet material may be, for example, about 0.05 mm to 10 mm.

  More preferable works include, for example, a molded ceiling provided on the interior surface side of a roof panel in a vehicle such as an automobile, and a sheet material used for a luggage trim and a door trim in a vehicle. As such a sheet material, a laminated sheet material including a base material layer and a skin layer provided on the front surface side (inner surface side) of the base material layer is further suitable. The base material layer is preferably a urethane resin, and more preferably a structure in which glass fiber mats are laminated on both surfaces of the urethane resin layer. As the skin layer, a cloth material such as a cloth sheet, a non-woven fabric sheet, and a thermoplastic resin sheet, and a laminated skin material in which a cushion layer such as polyethylene foam, polyurethane foam, or polypropylene foam is lined on the back surface of the skin material, or the like. Can be mentioned. Further, the above laminated sheet material is more preferably one in which a nonwoven fabric (backside nonwoven fabric) is provided on the back surface side (outdoor surface side) of the base material layer, and a polyester fiber nonwoven fabric is suitable as the back surface nonwoven fabric.

  In the heat shield plate arranging step, a heat shield plate that suppresses heating of a portion other than the end portion of the work is brought into contact with the bending position of the work. Since the manufacturing method of the present embodiment includes the step of disposing the heat shield plate, it is possible to prevent the portion other than the end portion of the work from being deformed by the heat using the hot air heater and the infrared heater together in the heating step performed after this step. Can be suppressed. Further, in order to bring the heat shield plate into contact with the bending position of the work, by keeping the heat shield plate in contact with the bending position of the work in the bending process after the heating process, It can also function as a folding support plate.

  In the heating step, the end portion of the work with which the heat shield plate abuts is heated by the infrared heater while being heated by the hot air heater. By performing the heating step in a state where the heat shield plate is in contact with the bending position of the work, it is possible to heat the end portion of the work while suppressing heating of a portion other than the end portion of the work. By heating the end of the work prior to bending the end of the work, the end of the work can be softened, and the end of the work can be easily bent.

  Further, in the manufacturing method of the present embodiment, by using the hot air heater and the infrared heater together, heating by only the heater block as disclosed in Patent Document 1 or heating by only hot air as disclosed in Patent Document 2 is performed. It is possible to heat the end portion of the work more efficiently than in the case of. Therefore, in the manufacturing method of the present embodiment, the heating time of the end portion of the work can be shortened and the end portion of the work can be bent as compared with the heating method in the above-described conventional technique or the heating method using only the infrared heater. Sufficient heat can be applied in a short time to facilitate the process. Thereby, the manufacturing method of the present embodiment can also contribute to shortening the cycle time required for bending the end portion of the work.

  “To heat the end portion of the work with the infrared heater while heating with the hot air heater” means to include a state in which the heating by the hot air heater and the heating by the infrared heater are simultaneously performed. Therefore, the timing of starting and ending the heating by the hot air heater and the heating by the infrared heater may be deviated. In the manufacturing method of the present embodiment, the end portion of the work with which the heat shield plate abuts is heated by the hot air heater before being heated by the infrared heater, and is heated by the infrared heater while being heated by the hot air heater. Is preferred. As a result, the end portion of the work can be heated more efficiently, which contributes to further shortening of the heating time and eventually to further shortening of the cycle time.

  The size, shape, and number of installed hot-air heaters and infrared heaters are not particularly limited, but the hot-air heater outlets and infrared heaters are arranged along the region where the bending process is performed at the end of the work. It is preferable to perform the heating step. As a result, it is possible to substantially uniformly heat the entire region in the length direction of the region where the work is bent at the end portion, and it is possible to suppress uneven heating.

  Here, when the heater is arranged along the region where the bending process is performed at the end of the work, the size of the region is larger than the size (length) of the region. In some cases, it may be better to arrange a plurality of small existing product heaters side by side in terms of cost for procuring the heaters. From such a point of view, when a plurality of infrared heaters are arranged side by side along the region where the work is bent and the end portions of the work are heated only by the plurality of infrared heaters, the joint parts of the infrared heaters Due to the gap in the above, uneven heating is likely to occur. The uneven heating caused in such a case can be suppressed by using a hot air heater together.

  Further, if heating unevenness occurs in a part of the region where the bending process is performed at the end of the work, a step may occur at the bent end of the manufactured molded body. Generation of such a step can be suppressed by arranging the blowout port of the hot air heater and the infrared heater along the region of the end portion of the work to be bent and performing the heating step. Further, when the molded product having the step is used for a molded ceiling or the like of a roof panel of a vehicle, light leakage may occur due to the effect of the step, but it can also contribute to the suppression of such light leakage. .

  The infrared heater used in the heating step is a heater that uses a current flowing through a heating element to emit infrared rays. Suitable infrared heaters include halogen heaters that utilize radiant heat generated from halogen lamps as heating elements; carbon heaters that use carbon fibers as heating elements; ceramic heaters that use ceramics as heating elements. it can. Among these, a halogen heater is more preferable.

In the heating step, it is preferable to further use a reflecting material that reflects the heat from the infrared heater toward the end of the work. By using such a reflective material, the heat generated from the infrared heater can be easily concentrated in the direction toward the end portion of the work, so that the end portion of the work can be heated more efficiently. Examples of the reflecting material include a reflecting plate and a reflecting umbrella which are separate from the infrared heater, and a reflecting plate and a reflecting film integrally provided on the infrared heater. Examples of the material of the reflective material include ceramics (for example, one or more kinds of TiO ₂ , Ta ₂ O ₅ , and SiO ₂ ) and aluminum.

  The heating temperature and the heating time in the heating step can be appropriately determined according to the material, thickness, size and the like of the above-mentioned work. For example, when a sheet material suitable for the above-mentioned molded ceiling of a vehicle is used as the work, the surface temperature of the sheet material (work) is 180 to 300 ° C (more preferably 200 to 280 ° C, further preferably 220 to It is preferable to set the heating temperature to 250 ° C.). In this case, the heating temperature by the combined use of the hot air heater and the infrared heater is preferably 350 to 600 ° C., more preferably 400 to 570 ° C., and more preferably 420 to 550 near the outlet (outlet) of the hot air heater. It is more preferable that the temperature is ° C. In addition, the heating time by the combined use of the hot air heater and the infrared heater in this case is preferably 2 to 20 seconds, more preferably 5 to 15 seconds, and further preferably 5 to 10 seconds.

  In the bending step, the end portion of the work heated in the heating step is bent. By this bending step, it is possible to obtain a molded body in which the end portion of the work is bent. Even in the bending process, it is preferable to keep the heat shield plate in contact with the bending position of the work. Thereby, the heat shield plate can also be used as a bending support plate for the work. That is, it is preferable that the bending step includes a step of supporting the end portion of the work on the heat shield plate from the bending position of the work and bending the work along the surface of the heat shield plate. By using the heat shield plate as a bending support plate for the work as it is, it is possible to perform heat shield and bending support in one operation, which contributes to the improvement of production efficiency and the reduction of manufacturing cost. it can.

  In the bending step, it is preferable to use a block that presses the end portion of the work. With the block, it is preferable to first perform a step (primary bending step) of bending the workpiece along the surface of the heat shield plate with the end supported by the heat shield plate. Then, after the primary bending step, it is preferable that the heat shield plate is retracted and the end portion bent in the primary bending step is further bent in a block and folded back (secondary bending step). By the bending step including the primary bending step and the secondary bending step, it is possible to more efficiently obtain a molded product having an end portion subjected to bending processing with a clean finish.

  It is preferable that the secondary bending step is performed in a state in which the regulating member is pressed against the corner portion (corner formed at the bending position of the work) which is the base of the end portion bent in the primary bending step. Accordingly, in the secondary bending step, when the bending member is further bent and folded back, the regulation member holds down the corner portion of the folded portion and the height of the corner portion is regulated. The height can be made constant, and the variation in quality can be suppressed. The block and the regulating member may be removable from each other. In this case, in the heating step and the primary bending step, these are integrated and can be moved integrally, and in the secondary bending step, the restricting member is separated from the block to be a separate body. Can be moved individually.

<Manufacturing equipment>
Next, an apparatus for manufacturing a molded article according to an embodiment of the present invention (hereinafter, sometimes referred to as a “manufacturing apparatus according to the present embodiment”) suitable for carrying out the above-described manufacturing method according to the present embodiment will be described. .

  The manufacturing apparatus according to the present embodiment is an apparatus that bends an end portion of a work to produce a molded body having the end portion bent. This manufacturing apparatus includes a heating unit that heats an end portion of a work, and a heat shield that suppresses heating of a portion of the work other than the end portion by contacting a bending position of the work during heating by the heating unit. And a thermal unit. Further, the heating unit includes a hot air heater that heats the end of the work with which the heat shield plate abuts, and an infrared heater that heats the end of the work in parallel with the heating by the hot air heater.

  Since the manufacturing apparatus of the present embodiment includes the heat shield unit including the heat shield plate, it is possible to suppress the deformation of the portion other than the end portion of the work due to the heat using the hot air heater and the infrared heater together in the heating unit. it can. Further, since the heat shield plate is brought into contact with the bending position of the work, the heat shield plate is kept in contact with the bending position of the work when the end portion of the work is bent after being heated. Can also serve as a bending support plate for the work.

  Since the manufacturing apparatus of the present embodiment includes a heating unit that includes a hot air heater that heats the end of the work with which the heat shield plate abuts, and an infrared heater that heats the end of the work in parallel with the heating by the hot air heater. The end portion of the work can be heated more efficiently. By using a hot air heater and an infrared heater in combination, heating by only the heater block as disclosed in Patent Document 1, heating by only hot air as disclosed in Patent Document 2, and further heating by only an infrared heater, It is possible to shorten the heating time of the end portion of the work.

  In the case of heating by the heater block, since the high temperature heater block is brought into contact with the end portion of the work, the temperature of the heater block is controlled in order to suppress carbonization of the work that may occur due to too high temperature. It is desirable to make it as low as possible according to the material of. However, if so, the heating time tends to be long. Further, when the heater block is pressed against the end of the work, a support member that holds the work together with the heater block is required, and the operation tends to be complicated. Further, from the viewpoint of improving the heating efficiency, it is desirable that the heater block and the end of the work be in contact with each other without a gap. For that purpose, it is necessary to process the heater block and the supporting member into a three-dimensional shape that matches the shape of the work. There is. On the other hand, in the manufacturing apparatus of the present embodiment, the heating unit that uses both the hot air heater and the infrared heater can heat the end portion of the work more efficiently in a state where the heating unit is not in contact with the work. Therefore, carbonization of the end portion of the work can be suppressed, and since the above-mentioned supporting member is not required, it is possible to contribute to simplification of operation and suppression of device cost.

  Also in the case of heating with only the hot air, there is room for improvement in heating efficiency, power consumption is high, and the amount of energy used per work piece tends to be high. On the other hand, in the manufacturing apparatus of the present embodiment, the end portion of the work can be heated more efficiently by the heating unit that uses the hot air heater and the infrared heater together, and the heating time of the end portion of the work can be shortened. it can. Therefore, as a result, it is possible to contribute to the reduction of the amount of energy used for one work.

  In the manufacturing apparatus of the present embodiment, it is preferable that the hot air heater outlet and the infrared heater in the heating unit are arranged side by side so that they can be arranged along the region of the end of the workpiece to be bent. As a result, it is possible to uniformly heat the entire region in the lengthwise direction of the region where the bending work is performed at the end of the work, and it is possible to suppress uneven heating. Further, by suppressing the uneven heating, as described above, it is possible to suppress the occurrence of a step at the bent end portion of the manufactured formed body, and further, use the formed body having a step as the forming ceiling. It can also contribute to the suppression of light leakage that may occur in some cases.

  As described above, the infrared heater in the heating unit is preferably a halogen heater, a carbon heater, a ceramic heater, or the like. Among these, the heating unit more preferably includes a halogen heater as the infrared heater.

  Further, as described above, from the viewpoint of improving the heating efficiency, it is preferable that the heating unit includes a reflective material that reflects the heat generated by the infrared heater toward the end of the work. The heating unit is provided on the side opposite to the end side of the work in the infrared heater, for example, separately from the infrared heater (external) a reflecting material (for example, a reflection plate and a reflecting umbrella) or integrally with the infrared heater. A provided reflection material (for example, a quartz tube whose inner surface is mirror-finished; a reflection plate provided inside the quartz tube; a reflection film coated on the outer surface of the quartz tube) can be provided. From the viewpoint of suppressing the number of parts, the infrared heater in the heating unit is more preferably an infrared heater provided with a reflective film as a reflective material, and further preferably a halogen heater provided with a reflective film (a halogen heater with a reflective film).

  In addition to the heating unit and the heat shield unit described above, the manufacturing apparatus of the present embodiment preferably further includes a bending unit including a block that bends by pressing an end portion of the work heated by the heating unit. By the operation of the block in this bending unit, it is possible to execute the primary bending step and the secondary bending step described in the above-mentioned manufacturing method, and thereby, the end portion that has been subjected to bending processing with a clean finish can be performed. It is possible to more efficiently obtain the molded article having the above.

  Hereinafter, an example of a more preferable configuration, operation, and the like of the manufacturing apparatus of the present embodiment will be described mainly with reference to manufacturing examples of a molded body applied to a molded ceiling of a vehicle, with reference to the drawings. It should be noted that, in each of the drawings, some of the reference numerals are omitted for the sake of easy viewing of the drawings.

  FIG. 1 is an explanatory diagram showing a schematic configuration of an example of the manufacturing apparatus of the present embodiment, and is a diagram showing an initial state of the manufacturing apparatus 10 of the example. FIG. 2 is an explanatory diagram showing a schematic configuration of the heating unit 20 in the manufacturing apparatus 10 shown in FIG. 1, and is a schematic plan view of the infrared heater 22 and the hot air heater 21 as seen from the heater driving cylinder 23 side in the heating unit 20. . 3A to 3D (these may be collectively referred to as FIG. 3) are diagrams for explaining the operation of the manufacturing apparatus 10 shown in FIG. In the following description, a surface direction substantially parallel to the surface of the installation table 61 to which the receiving table 60 on which the workpiece 70 is mounted is fixed (the surface direction along the left-right direction in FIGS. 1 and 3 and the vertical direction in FIG. May be referred to as a “horizontal direction”. Further, a direction substantially vertical to the surface of the installation table 61 (vertical direction in FIGS. 1 to 3) may be described as “vertical direction”.

  The manufacturing apparatus 10 shown in FIG. 1 includes a heating unit 20 that heats an end portion 71 of a work 70, and a heat shield unit 30 that includes a heat shield plate 31 that abuts a bending position 71 a of the work 70 when heating by the heating unit 20. Prepare The heating unit 20 includes a hot air heater 21 that heats the end 71 of the work 70 with which the heat shield plate 31 abuts, and an infrared heater 22 that heats the end 71 of the work 70 in parallel with the heating by the hot air heater 21. Including.

  It is preferable that the heating unit and the heat shield unit in the manufacturing apparatus of this embodiment are configured to be movable up and down. Although illustration is omitted, in the manufacturing apparatus 10 shown in FIG. 1, the heating unit 20 and the heat shield unit 30 are movable bases (upper side of the heating unit 20 in FIG. (Arranged) is attached via a fixture or the like. As a result, the heating unit 20 and the heat shield unit 30 can move up and down in the vertical direction (vertical direction in FIG. 1).

  Further, it is preferable that the heating unit in the manufacturing apparatus of the present embodiment is configured to be movable in a direction in which the hot air heater and the infrared heater approach the heat shield plate and a direction in which the hot air heater and the infrared heater separate from the heat shield plate. Specifically, it is more preferable that the heating unit is provided with a drive cylinder (heater drive cylinder) capable of moving the hot air heater and the infrared heater in these directions. In the manufacturing apparatus 10 shown in FIG. 1, the heater driving cylinder 23 is provided in the heating unit 20. When heating the end portion 71 of the work 70, the heater driving cylinder 23 is driven to move the hot air heater 21 and the infrared heater 22 toward the heat shield plate 31 and the work 70 side in the vertical direction (downward direction in FIGS. 1 and 3). ), And heating can be performed at a position near the end 71 of the work 70 (see FIG. 3A). Further, when the end 71 of the heated work 70 is bent, the heater driving cylinder 23 is driven to move the hot air heater 21 and the infrared heater 22 from the heat shield plate 31 and the work 70 in the vertical direction (see FIG. 1 and 3 (upward in FIG. 3) (see FIG. 3B).

  On the other hand, it is preferable that the heat shield unit in the manufacturing apparatus of the present embodiment is configured to be movable in a direction in which the heat shield plate advances to the bending position of the end portion of the work and in a direction away from the bending position. Specifically, it is more preferable that the heat shield unit is provided with a drive cylinder (heat shield plate drive cylinder) capable of moving the heat shield plate in these directions. In the manufacturing apparatus 10 shown in FIG. 1, the heat shield unit driving cylinder 32 is provided in the heat shield unit 30. When the end portion 71 of the work 70 is heated, the heat shield plate driving cylinder 32 is driven to move the heat shield plate 31 to the bending position 71a of the work 70 in the horizontal direction (leftward in FIGS. 1 and 3). It can be moved and placed in contact with the bending position 71a (see FIG. 3A). Further, when the end portion 71 of the work 70 is further bent and folded back or when the bending process is completed, the heat shield plate driving cylinder 32 is driven to move the heat shield plate 31 away from the bending position of the work 70 in the horizontal direction (see FIG. 1 and to the right in FIG. 3) (see FIG. 3D).

  As shown in FIG. 2, the heating unit 20 includes a hot air heater 21 including a pipe 21a through which hot air flows, a nozzle portion 21b that blows out the hot air, and its outlet 21c, and an infrared heater disposed on the nozzle portion 21b side of the hot air heater 21. And 22. The blowout port 21c of the hot air heater 21 and the infrared heater 22 in the heating unit 20 are arranged side by side so as to be arranged along the region (the left-right direction in FIG. 2) of the end portion 71 of the work 70 to be bent. It is preferable. As a result, the end portion 71 of the work 70 can be heated substantially uniformly over the entire length in the lengthwise direction (the left-right direction in FIG. 2) of the region to be bent, and the end portion 71 of the work 70 is unevenly heated. Can be suppressed.

  The infrared heater 22 is preferably formed in an L-shape or a U-shape (horizontally U-shape) as shown in FIG. According to the infrared heater having such a shape, parts such as the sealing portion and the lead wire, which are often provided on the end side of the infrared heater, can be separated to some extent from the blowout port 21c of the hot air heater 21. Further, the U-shaped infrared heater 22 is provided with a heat source such as a filament in a horizontal portion along the length direction, so that the end portion 71 of the work 70 is bent as described above. Can be arranged along the area.

  Further, as the infrared heater 22 shown in FIG. 2, it is preferable to use the halogen heater with a reflection film described above. The halogen heater with a reflective film is, for example, a surface (a half surface) opposite to the surface disposed on the end 71 side of the work 70 on the outer surface of the quartz tube in which a filament, an inert gas or the like is enclosed. A halogen heater having a reflective film formed on it can be used. By using such a halogen heater with a reflective film, the heat generated from the halogen heater can be concentrated in the direction toward the end 71 of the work 70, and the end 71 of the work 70 can be heated more efficiently.

  In addition, in FIG. 2, the outlets 21c of the five hot air heaters 21 and the two infrared heaters 22 are provided side by side substantially in parallel, but the size, shape, and installation of the hot air heaters 21 and the infrared heaters 22 are set. The number and the like are not limited to those shown in FIG.

  The manufacturing apparatus of the present embodiment preferably includes a pressing member for the work together with the heating unit and the heat shield unit, and more preferably includes a pressing member configured to be movable up and down. The manufacturing apparatus 10 shown in FIG. 1 includes a pressing unit 41 including a pressing member 41 for a work 70 and a rod-shaped mounting tool 42. The holding member 41 of the holding unit 40 is attached to the above-described movable base (not shown) by a rod-shaped attachment 42 or the like, and rises and falls vertically along with the heating unit 20 and the heat shield unit 30 (Fig. 1 up and down) can be moved. By the manufacturing apparatus 10 including the pressing member 41, the pressing member 41 can suppress the work 70, so that when the end 71 of the work 70 is heated and bent, the work 70 can be prevented from being displaced. A molded product with stable quality can be manufactured. 3A to 3D described later, the illustration of the attachment 42 is omitted from the viewpoint of easy viewing of the drawings.

  It is preferable that the manufacturing apparatus of the present embodiment includes a pedestal on which the work before being bent is placed. The manufacturing apparatus 10 shown in FIG. 1 includes a receiving table 60 fixed to an installation table 61, and a work 70 can be placed on the receiving table 60.

  It is preferable that the manufacturing apparatus of the present embodiment further includes a bending unit including a block that bends by pressing the end portion of the work heated by the heating unit. The manufacturing apparatus 10 shown in FIG. 1 includes a folding unit 50 provided on an installation table 61. The folding unit 50 includes a block 51, a plate-shaped restricting member 52, a first cylinder 53 that moves the block 51 and the restricting member 52 in the horizontal direction (the left-right direction in FIG. 1), and the block 51 in the vertical direction (see the figure). The second cylinder 54 is moved in the vertical direction 1). With such a folding unit 50, the folding process including the above-described primary folding process and secondary folding process can be easily performed.

  It is preferable that the manufacturing apparatus of the present embodiment includes a control unit (control panel) that executes and stops heating of the hot air heater and the infrared heater in the heating unit and controls the operation of these heaters. Further, it is preferable that the control unit controls the drive of the moving mechanism (movable table) and each cylinder by executing and stopping the operation. It is preferable that the control unit further controls the temperature and time of heating by each heater, the amount of movement of the moving mechanism and each cylinder, the timing of operation, and the like. The manufacturing apparatus 10 shown in FIG. 1 also includes such a control unit (not shown). The control unit can include, for example, a power supply unit, a CPU unit, an input unit, an output unit, a storage unit, and the like. The control unit is connected to a power source, connected to a target component controlled by the control unit by a cable, and can send electricity or a signal to them.

  Next, a preferable operation mode of the manufacturing apparatus 10 shown in FIG. 1 will be described with reference to FIGS. 1 and 3A to 3D.

  From the initial state shown in FIG. 1, the above-mentioned movable table (the pressing unit 40, the heating unit 20, and the heat shield unit 30 attached thereto) is pressed toward the work 70 placed on the receiving table 60, and the pressing member 41 is provided. Lowers the work 70 vertically. Next, the heat shield plate driving cylinder 32 in the heat shield unit 30 is driven to move the heat shield plate 31 in the horizontal direction in which the heat shield plate 31 advances to the bending position 71 a of the end portion 71 of the work 70, and the heat shield plate 31 is moved to the end of the work 70. The portion 71 is placed in contact with the bending position 71a. In this way, the above-mentioned step of disposing the heat shield plate 31 is executed. Further, the heater driving cylinder 23 in the heating unit 20 is driven to lower the hot air heater 21 and the infrared heater 22 in the vertical direction approaching the heat shield plate 31. These operations bring the manufacturing apparatus 10 into a state as shown in FIG. 3A.

  In the state shown in FIG. 3A, a step of heating the end portion 71 of the work 70 by the infrared heater 22 while heating the end portion 71 of the work 70 (the above-described heating step) is performed. At this time, since the heat shield plate 31 is in contact with the bending position 71a of the work 70, it is possible to prevent the portion 72 of the work 70 other than the end portion 71 from being heated. Further, when the end portion 71 of the work 70 is heated by the heating unit 20, before the heaters 21 and 22 are lowered by the heater driving cylinder 23 (before the state shown in FIG. 3A is reached), the hot air heater 21 is set in advance. It is preferable to operate the infrared heaters 22 after the heaters 21 and 22 are lowered (in the state shown in FIG. 3A). By such an operation, the end portion 71 of the work 70 can be heated more efficiently. From this point of view, when the manufacturing apparatus 10 is operating, the temperature of the hot air heater 21 is always kept high, the heaters 21 and 22 are lowered by the heater driving cylinder 23, the infrared heater 22 is turned on and off, and the heater is driven. It is more preferable to repeat the order of raising the heaters 21 and 22 by the cylinder 23 (see FIG. 3B).

  By heating the end portion 71 of the work 70 by the heating unit 20, the end portion 71 of the work 70 is softened and is ready to be bent, and then the heater driving cylinder 23 is driven to drive the hot air heater 21 and the infrared heater. 22 is moved in the vertical direction (upward in FIG. 3) away from the heat shield plate 31. At the same time as or immediately after that, the second cylinder 54 in the bending unit 50 is driven to raise the block 51. These operations bring the manufacturing apparatus 10 into a state as shown in FIG. 3B. As described above, by moving the hot air heater 21 and the infrared heater 22 in the vertical direction (upward direction in FIG. 3) away from the heat shield plate 31, and moving the block 51 in the folding unit 50 upward in the vertical direction, It is possible to quickly shift to the operation of bending the end portion 71 of the work 70 (the above-described bending step).

  Next, as shown in FIG. 3C, the block 51 moved up by the driving of the second cylinder 54 and the plate-shaped regulating member 52 are moved in the horizontal direction toward the work 70 by driving the first cylinder 53 of the folding unit 50. And moves the work 70 in the bending direction (rightward in FIG. 3). Accordingly, the step of bending the end portion 71 of the work 70 (the above-described primary bending step) can be performed. At this time, by keeping the heat shield plate 31 in contact with the bending position 71a of the work 70, the end portion 71 of the work 70 is supported by the heat shield plate 31 and the surface of the heat shield plate 31 is supported. Can be folded along. Further, the regulating member 52 is also advanced to the work 70 side together with the block 51, so that the regulating member 52 is pressed against the corner portion (corner formed at the bending position of the workpiece) 71b which is the base of the bent end portion 71. Can be in a state.

  Then, as shown in FIG. 3D, the heat shield plate drive cylinder 32 is driven to move the heat shield plate 31 in the horizontal direction (to the right in FIG. 3D) retracting from the bending position of the end portion 71 of the work 70, and The block 51 that has advanced to the work 70 side is further lowered by being driven by the second cylinder 54 while being separated from the regulating member 52. As a result, the above-described secondary bending step is performed, the bent end portion 71 can be further bent and folded back, and a molded body having a cleanly-finished end portion 71 can be obtained more efficiently. be able to. At this time, since the regulation member 52 presses the corner portion 71b, which is the base of the end portion 71 bent in the primary bending process, the height of the corner portion 71b is regulated, and thus in the molded body to be manufactured. The height of the corner portion 71b can be made constant, and variation in quality can be suppressed.

  After folding back the end portion 71 of the work 70, the second cylinder 54 is driven to raise the block 51 in the vertical direction, and then the first cylinder 53 is driven to separate the block 51 and the restriction member 52 from the work 70. The block 51 is moved in the horizontal direction (leftward in FIG. 3), and the second cylinder 54 is driven again to lower the block 51 in the vertical direction. In this way, the folding unit 50 returns to the initial state. Then, the movable table is lifted in the vertical direction (upward direction in FIG. 3) away from the work 70, and the pressing unit 40, the heating unit 20, and the heat shield unit 30 attached to the movable table return to the initial state. Finally, the work 70 is removed from the pedestal 60, and a molded body having the end portion 71 with a clean finish bent can be obtained.

  According to the manufacturing method and the manufacturing apparatus of the present embodiment described in detail above, the hot air heater and the infrared heater are used together, and the use of the heat shield plate suppresses the deformation of the work other than the end portion due to heating, The end portion of can be heated more efficiently. Therefore, according to the manufacturing method and the manufacturing apparatus of the present embodiment, the heating time and the cycle time can be shortened as compared with the conventional technique, and the molded body whose end portion is bent can be manufactured more efficiently. It is possible.

  Specifically, the manufacturing apparatus 10 shown in FIG. 1 equipped with the above-mentioned halogen heater with a reflection film as the infrared heater 22, and an apparatus different from the manufacturing apparatus 10 only in that the infrared heater is not provided (that is, , A device for heating the end portion of the work only with a hot air heater; referred to as "comparative device A"), and a device including the above-mentioned heater block in place of the heating unit 20 (referred to as "comparative device B"). A comparative test was conducted. As a result, in the comparative device A, the heating time took 17 to 25 seconds and the cycle time was 57 seconds, and in the comparative device B, the heating time took 50 seconds and the cycle time was 120 seconds. On the other hand, in the manufacturing apparatus 10, the heating time was 7 to 10 seconds and the cycle time was 39 seconds, the heating time and the cycle time were shorter than those of the comparative apparatuses A and B, and the end portion was bent. It was confirmed that the molded body could be manufactured more efficiently. Here, the cycle time is the time taken from placing the work 70 on the pedestal 60 to taking it out from the pedestal 60 after the bending of the end 71 is completed.

As described above, the manufacturing method and the manufacturing apparatus according to the embodiment of the present invention can have the following configurations.
[1] A method for manufacturing a molded product in which an end portion of a work is bent and the end portion is bent, wherein a portion other than the end portion of the work is heated at a bending position of the work. And a heating step of heating the end portion of the work with which the heat shield plate abuts with an infrared heater while heating the end portion of the workpiece with which the heat shield plate abuts. And a bending step of bending the end portion of the heated work, the method for producing a molded body.
[2] The molded body according to the above [1], wherein the hot air heater outlet and the infrared heater are arranged along a region of the end portion of the workpiece to be bent, and the heating step is performed. Manufacturing method.
[3] The method for producing a molded product according to the above [1] or [2], wherein a halogen heater is used as the infrared heater.
[4] The method for producing a molded article according to any one of [1] to [3], further including a reflective material that reflects heat from the infrared heater toward the end of the work.
[5] The above-mentioned [1] to [4], wherein the bending step includes a step of supporting the end portion from the bending position of the work by the heat shield plate and bending the work along the surface of the heat shield plate. A method for producing a molded article according to any one of 1.
[6] In the bending step, a block that presses the end of the work causes the end to be supported by the heat shield plate from the bending position of the work and is bent along the surface of the heat shield plate. A secondary bending step, and a secondary bending step in which the heat shield plate is retracted after the primary bending step, and the end portion bent in the primary bending step is further bent and folded back in the block. The method for producing a molded article according to any one of [1] to [5] above.
[7] A device for manufacturing a molded product having a bent end part of a work, the end part being bent, and a heating unit for heating the end part of the work, and a heating unit for heating the end part. A heat shield unit that includes a heat shield plate that suppresses heating of a portion of the work other than the end portion by contacting a bending position of the work, and the heating unit includes the heat shield plate. An apparatus for manufacturing a molded article, comprising: a hot air heater that heats the end portion of the workpiece with which the abutting contact is made;
[8] In the above [7], the outlet of the hot air heater and the infrared heater in the heating unit are arranged side by side so that they can be arranged along the region of the end of the workpiece to be bent. An apparatus for manufacturing the described molded body.
[9] The apparatus for producing a molded body according to the above [7] or [8], wherein the heating unit includes a halogen heater as the infrared heater.
[10] The apparatus for manufacturing a molded body according to any one of [7] to [9], wherein the heating unit includes a reflecting material that reflects heat from the infrared heater toward the end of the work.
[11] The apparatus for manufacturing a molded article according to [10], wherein the heating unit includes a halogen heater provided with a reflective film as the reflective material, as the infrared heater.
[12] The apparatus for manufacturing a molded product according to any one of [7] to [11], further including a bending unit including a block that bends by pressing the end portion of the work heated by the heating unit.

10 Molded Device Manufacturing Device 20 Heating Unit 21 Hot Air Heater 22 Infrared Heater 23 Heater Driving Cylinder 30 Heat Shielding Unit 31 Heat Shielding Plate 32 Heat Shielding Plate Driving Cylinder 40 Holding Unit 41 Holding Member 42 Mounting Tool 50 Bending Unit 51 Block 52 Controlling Member 53 first cylinder 54 second cylinder 60 cradle 70 work 71 end

Claims (12)

A method of bending an end portion of a work to produce a molded body in which the end portion is bent,
In the bending position of the work, a step of arranging a heat shield plate in which a heat shield plate that suppresses heating of a portion other than the end portion of the work is brought into contact,
A heating step of heating the end portion of the work with which the heat shield plate is in contact with an infrared heater while heating with a hot air heater,
And a bending step of bending the end portion of the heated workpiece.   The method for producing a molded product according to claim 1, wherein the hot air heater outlet and the infrared heater are arranged along a region of the end portion of the work to be bent, and the heating step is performed.   The method for producing a molded article according to claim 1, wherein a halogen heater is used as the infrared heater.   The method for producing a molded product according to claim 1, further comprising a reflective material that reflects heat from the infrared heater toward the end portion of the work.   The bending step includes a step of supporting the end portion of the work piece from the bending position and bending the work piece along a surface of the heat shield plate from the bending position. A method for producing the described molded article. The bending step is a primary bending in which the block pressing the end of the work causes the end of the work to be supported by the heat shield plate and is bent along the surface of the heat shield from the bending position of the work. Process,
A secondary bending step in which the heat shield plate is retracted after the primary bending step, and the end portion bent in the primary bending step is further bent and folded back by the block;
The manufacturing method of the molded object of any one of Claims 1-5 containing. A device for bending a work end portion to produce a molded body in which the end portion is bent,
A heating unit for heating the end portion of the work;
A heat shield unit that includes a heat shield plate that suppresses heating of a portion of the work other than the end portion by contacting the bending position of the work during heating by the heating unit;
The heating unit includes a hot air heater that heats the end portion of the work with which the heat shield plate is in contact, and an infrared heater that heats the end portion of the work in parallel with heating by the hot air heater, Molded body manufacturing equipment.   The molded body according to claim 7, wherein the hot-air heater outlet and the infrared heater in the heating unit are arranged side by side so as to be arranged along a region of the end of the workpiece to be bent. Manufacturing equipment.   The apparatus for manufacturing a molded body according to claim 7, wherein the heating unit includes a halogen heater as the infrared heater.   The said heating unit is a manufacturing apparatus of the molded object of any one of Claims 7-9 containing the reflective material which reflects the heat by the said infrared heater toward the said edge part of the said workpiece | work.   The apparatus for manufacturing a molded body according to claim 10, wherein the heating unit includes, as the infrared heater, a halogen heater provided with a reflective film as the reflective material.   The apparatus for manufacturing a molded product according to claim 7, further comprising a bending unit including a block that bends by pressing the end portion of the work heated by the heating unit.

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