JP2011167984A - Heating apparatus for bending resin sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating apparatus for bending a resin sheet, heating a bending part of the resin sheet almost uniformly. <P>SOLUTION: The heating apparatus 10 for bending the resin sheet, heating the bending part 2 of the resin sheet 1 when bending the resin sheet 1 includes a heat source 11; a hot air blowoff port 13 opened in linear shape; a hot air temperature regulating part regulating the temperature of hot air; and a temperature smoothing mechanism 14 uniformizing the temperature of hot air along the longitudinal direction of the hot air blowoff port. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resin sheet bending heating apparatus that heats a bent portion of a resin sheet in order to facilitate the bending of the resin sheet.

  2. Description of the Related Art Conventionally, as a method for bending a thermoplastic resin sheet, a method in which a bent portion of a thermoplastic resin sheet is heated and then bent is used. That is, the resin sheet is easily bent by heating the bent portion of the thermoplastic resin sheet and softening the resin in the portion (see Patent Document 1).

JP-A-60-210424

  However, it is not easy to heat the entire bent portion of the resin sheet to a temperature optimal for bending, because the heating temperature of the bent portion tends to vary as the folding line becomes longer. If the heating temperature of the bent portion varies, for example, if a region having a temperature lower than the optimum temperature for bending is generated, stress may remain in the bent portion, and cracking or whitening may occur. On the other hand, if the heating temperature of the bent portion becomes too high, the periphery of the bent portion is unnecessarily deformed.

  Accordingly, an object of the present invention is to provide a heating apparatus for bending a resin sheet that heats the bent portion of the resin sheet substantially uniformly.

  A first characteristic configuration of a heating apparatus for bending a resin sheet according to the present invention is a heating apparatus for bending a resin sheet that heats a bent portion of the resin sheet when the resin sheet is bent. A hot air outlet that is opened in a shape, a hot air temperature adjusting unit that adjusts the temperature of the hot air, and a temperature smoothing mechanism that equalizes the temperature of the hot air along the longitudinal direction of the hot air outlet. In the point.

  As described above, the heating device for bending the resin sheet has the hot air temperature adjusting unit, thereby adjusting the hot air temperature optimum for the type of resin of the resin sheet to be bent, and the temperature-controlled hot air. Can be blown out from the hot air outlet, and the bent portion of the resin sheet can be heated. Therefore, the resin sheet can be easily bent.

  In addition, since the heating device for bending the resin sheet has a temperature smoothing mechanism that equalizes the temperature of the hot air along the longitudinal direction of the warm air outlet that opens linearly, Uniformity can be easily achieved. For this reason, the temperature unevenness in the longitudinal direction of the bent portion is suppressed, and the problem that the heating temperature is lowered and the stress remains, or the heating temperature becomes high and the periphery of the bent portion is overheated can be prevented. . That is, the resin strength is prevented from lowering, the resin bending accuracy is improved, and the appearance of the bent portion is improved.

  The second characteristic configuration of the heating apparatus for bending a resin sheet according to the present invention is that, as the temperature smoothing mechanism, the hot air temperature adjusting unit includes a hot air staying portion between the heat source and the hot air outlet. is there.

  With this configuration, the warm air heated by the heat source is first stored in the warm air retention part before being discharged from the warm air outlet. After adjusting the temperature of the hot air stored in the hot air retention part to a predetermined temperature, the hot air temperature is made uniform along the longitudinal direction of the hot air outlet by blowing it from the hot air outlet to the bent part of the resin sheet. can do. That is, the hot air staying part provided in the hot air temperature adjusting part functions as a temperature smoothing mechanism.

  According to a third characteristic configuration of the heating apparatus for bending a resin sheet according to the present invention, the temperature smoothing mechanism is configured to supply hot air to be blown to a bent portion of the resin sheet at least on both sides in the longitudinal direction of the hot air outlet. It is in the point provided with the diffusion prevention board which prevents diffusion.

  Thus, since the heating device for bending the resin sheet includes the diffusion prevention plates on both sides in the longitudinal direction of the hot air outlet, the hot air blown from the hot air outlet to the bent portion of the resin sheet is the hot air outlet. It is guided inside the diffusion prevention plate located on both sides in the longitudinal direction of the plate to prevent diffusion around the bent portion. Therefore, the warm air blown from the warm air outlet can be efficiently blown against the bent portion of the resin sheet.

  According to a fourth characteristic configuration of the heating apparatus for bending a resin sheet according to the present invention, the temperature smoothing mechanism includes a blowing hot air flow adjusting unit that adjusts at least one of the blowing position and the blowing direction of the hot air. is there.

When the opening width in the direction along the bent portion of the resin sheet is wide at the hot air outlet, a temperature difference is likely to occur in the hot air between the central portion and both end portions of the hot air outlet. In some cases, the temperature of the bent portion does not rise uniformly due to the shape of the bent portion.
Therefore, in the heating apparatus for bending a resin sheet of the present invention, the temperature smoothing mechanism is provided with a blown hot air flow adjusting unit that adjusts at least one of the hot air blowing position and the blowing direction.

  Therefore, variation in the heating temperature of the bent portion can be suppressed by appropriately adjusting the blowing position and blowing direction of the hot air by the blowing hot air flow adjusting unit.

It is a resin sheet bending process, where (a) shows an example of a resin sheet, (b) shows a heating process of a bent portion, and (c) shows a bending process. It is a figure which shows 1st Embodiment, (a) is a front longitudinal cross-sectional view, (b) is a bottom view, (c) shows the vicinity of a warm air blower outlet, respectively. It is a front longitudinal cross-sectional view of 2nd Embodiment. It is a figure which shows another embodiment, Comprising: (a) is a front longitudinal cross-sectional view, (b) shows the side longitudinal cross-sectional view of a warm air blower outlet, respectively. It is a figure which shows another embodiment, Comprising: (a) shows the warm air blower outlet comprised so that the swing was possible, (b) shows the warm air blower outlet comprised so that translation was possible, respectively. It is a front longitudinal cross-sectional view of another embodiment. It is a front longitudinal cross-sectional view of another embodiment. It is a figure which shows the bending process of another resin sheet, Comprising: (a) shows the heating process of a bending part, (b) shows a bending process, respectively.

[First embodiment]
As shown in FIGS. 1 and 2, the heating apparatus 10 for bending a resin sheet according to the present invention includes a heat source 11, a blowing means (not shown), a hot air channel tube 12, and an end of the hot air channel tube 12. And a hot air outlet 13 that is linearly opened in the part. The bent portion 2 is heated by blowing warm air heated by the heat source 11 from the hot air outlet 13 toward the bent portion 2 of the resin sheet 1. Furthermore, the resin sheet bending heating apparatus 10 includes a hot air temperature adjusting unit C that adjusts the temperature of the hot air. The hot air temperature adjustment unit C is configured to be able to change the heat amount of the heat source 11 and the output of the air blowing means, and can appropriately adjust the hot air temperature suitable for various resin sheets 1.

  In the present embodiment, as a resin molded product that bends along the bent portion 2, as shown in FIG. 1A, a resin sheet 1 in which a concave portion 1 a is formed on one surface to make the bent portion 2 thin. Is used. The bent portion 2 has a structure called an integral hinge, and a hinge portion having a length L and a thickness T corresponds to the bent portion 2. The length L and thickness T of the hinge portion and the curvature R from the end of the hinge portion toward the normal thickness portion of the resin sheet 1 are appropriately set according to the type of the thermoplastic resin, the thickness of the resin sheet 1 and the like. Has been. In addition, in this resin sheet 1, it bend | folds with the recessed part 1a of the bending part 2 inside.

  When the resin sheet 1 is bent, only the heated bent portion 2 is deformed. For this reason, the resin sheet 1 after bending hardly generates wrinkles or the like around the bent portion 2 and has a good appearance. The resin sheet 1 is obtained by a molding method such as extrusion molding, injection molding, or blow molding.

  When the resin sheet 1 is bent, as shown in FIG. 1B, first, the resin sheet 1 is supported on the support base 21, and the end portion of the resin sheet 1 is held using the fixing member 22. At the same time, the fixing member 22 has a function of positioning the bent portion 2 of the resin sheet 1 at a position facing the hot air outlet 13 of the heating apparatus 10 for bending the resin sheet. In addition, the resin sheet 1 is supported so that the surface of the back side of the recessed part 1a of the bending part 2 may oppose the warm air blower outlet 13 of the heating apparatus 10 for resin sheet bending.

  After the resin sheet 1 is set on the support base 21 in this way, the hot air outlet 13 of the resin sheet bending heating device 10 is moved close to the upper portion of the bent portion 2, and hot air is blown to the bent portion 2. Heat. After heating the bent part 2 for a predetermined time and raising the temperature of the resin in the bent part 2 to a predetermined temperature, as shown in FIG. Bend along the bent portion 2. Since the bent portion 2 is heated and softened, the resin sheet 1 can be easily bent.

  When the bent portion 2 of the resin sheet 1 is heated, if the temperature of the hot air varies along the longitudinal direction of the hot air outlet, the heating temperature of the bent portion 2 is partially compared with the optimum temperature. It becomes lower and higher. If it becomes so, the residual of the stress by low heating temperature will be seen in a part of bending part 2, and the deformation | transformation of the surroundings of the bending part 2 by high heating temperature will be seen, and it is unpreferable on a product.

  Therefore, the hot air temperature adjusting unit C of the heating apparatus 10 for bending a resin sheet according to the present invention has a hot air flow path pipe 12 between the heat source 11 and the hot air outlet 13 as shown in FIG. The wind retention part 15 is provided. In the warm air retention part 15, the warm air heated by the heat source 11 is temporarily stored, and the temperature of the warm air in the warm air retention part 15 is adjusted to a temperature that is substantially uniform and optimal for bending the resin sheet 1. After completion of the temperature adjustment of the hot air in the hot air staying part 15, the hot air in the hot air staying part 15 is blown from the hot air outlet 12 to the bent portion 2 of the resin sheet 1 and heated. That is, the hot air retention part 15 functions as the temperature smoothing mechanism 14 and uniformizes the temperature of the hot air along the longitudinal direction of the hot air outlet 13.

  As shown in FIGS. 2 (b) and 2 (c), the resin sheet bending heating device 10 has a diffusion prevention plate 16 in the warm air blowing direction on both sides in the longitudinal direction of the warm air outlet 13. Are provided along. The diffusion prevention plate 16 prevents the warm air blown to the bent portion 2 of the resin sheet 1 from diffusing around the bent portion 2. Therefore, the heating efficiency with respect to the bending part 2 of the warm air blown from the warm air outlet 13 is improved, and the temperature drop of the warm air blown from the hot air outlet 13 is also suppressed. The diffusion prevention plate 16 may be provided not only on both sides in the longitudinal direction of the hot air outlet 13 but also on the entire circumference of the hot air outlet 13. In addition, in this embodiment, although the resin sheet 1 is bent with the recessed part 1a of the bending part 2 inside, it can also be bent with the recessed part 1a outside as another embodiment.

[Second Embodiment]
In the second embodiment, the hot air temperature adjusting unit C includes, as the temperature smoothing mechanism 14, a flow path switching member 17 that switches the hot air flow path from the heat source 11 to the hot air outlet 13 instead of the hot air staying part 15. It is a configuration. As shown in FIG. 3, the flow path switching member 17 is composed of a blade plate 17 b provided with a rotating shaft 17 a, and a plurality of flow path switching members 17 are arranged in the hot air flow path toward the warm air outlet 13. By rotating each vane plate 17b about the rotation shaft 17a and individually changing the angle of the vane plate 17b, the hot air flow path toward the hot air outlet 13 is switched as a result. Thus, when the hot air flow path toward the hot air outlet 13 is switched, the hot air temperature along the longitudinal direction of the hot air outlet 13 is changed. Therefore, by appropriately changing the angle of each vane plate 17b, the hot air flow path toward the hot air outlet 13 can be switched so that the temperature of the hot air along the longitudinal direction of the hot air outlet 13 becomes uniform. .

[Another embodiment]
(1) Instead of the flow path switching member constituted by the rotatable blade plate of the second embodiment, as a flow path switching member, as shown in FIGS. 4 (a) and 4 (b), a heating device A plurality of flow path switching members 17 that can be changed between a projecting posture and a retracted posture may be arranged with respect to the hot air flow passages toward the ten hot air outlets. This flow path switching member 17 hinders the flow of hot air when it is in a protruding position with respect to the hot air flow path, and allows the flow of hot air when it is in a retracted position. Accordingly, by appropriately changing each flow path switching member 17 between the protruding posture and the retracted posture, the temperature toward the hot air outlet 13 is set so that the temperature of the hot air along the longitudinal direction of the hot air outlet 13 becomes uniform. The air flow path can be switched.

(2) The temperature smoothing mechanism may include a blown hot air flow adjusting unit that adjusts at least one of the hot air blowing position and the blowing direction. As shown in FIG. 5 (a), the blowout hot air flow adjusting unit is configured such that the hot air outlet 13 can swing, and the hot air blowing direction with respect to the bent portion 2 can be adjusted to the front, rear, left, and right. As shown in FIG. 5 (b), the hot air outlet 13 can be moved substantially parallel to the resin sheet 1, and the hot air blowing position with respect to the bent portion 2 can be adjusted to the front, rear, left, and right. .

(3) The width of the flow area of the warm air can be changed by adjusting the flow path switching member 17 so as to cope with the case where the length of the bent portion 2 is smaller than the width of the warm air outlet 13.
As shown in FIG. 6, for example, when the flow path toward the hot air outlet 13 is gradually narrowed, a plurality of round bars 18 are used as the open / close switching member of the hot air outlet 13. The hot air outlet 13 may be partially closed to change the blowing area of the hot air outlet 13. In addition, as shown in FIG. 7, the hot air outlet 13 is provided with a plurality of opening / closing switching plates 18 as opening / closing switching members, and the open / closed state of each opening / closing switching plate 18 is appropriately adjusted to warm air outlets. You may make it the structure which changes 13 warm air blowing area | regions.

(4) In the above embodiment, hot air is blown from the hot air outlet 13 to the outer surface of the bent portion 2 of the resin sheet 1 and heated, but the inner surface of the bent portion 2 is heated from the hot air outlet 13. You may heat by blowing warm air. Moreover, in said embodiment, although the resin sheet 1 which made the bending part 2 thin was used, as shown to Fig.8 (a) and FIG.8 (b), the whole sheet | seat is the flat resin sheet 1. There may be.

(5) In the above embodiment, when it is desired to partially increase the heating of the bent portion 2 of the resin sheet 1, the distribution of the amount of hot air blown from the hot air outlet 13 is changed, and heating is performed. It may be configured to increase the amount of warm air blown to the part you want to strengthen,

  The heating apparatus for bending a resin sheet according to the present invention can be widely used in bending various resin exterior and interior products.

DESCRIPTION OF SYMBOLS 1 Resin sheet 1a Concave part 2 Bending part 11 Heat source 12 Hot air flow path pipe 13 Hot air blower outlet 14 Temperature smoothing mechanism 15 Hot air retention part 16 Diffusion prevention plate 17 Flow path switching member 18 Open / close switching member C Hot air temperature control part

Claims (4)

A resin sheet bending heating device that heats a bent portion of the resin sheet when the resin sheet is bent,
A heat source,
A hot air outlet that opens in a line;
A hot air temperature adjusting unit for adjusting the temperature of the hot air;
A heating device for bending a resin sheet, comprising: a temperature smoothing mechanism that equalizes a temperature of the hot air along a longitudinal direction of the hot air outlet.   The heating apparatus for bending a resin sheet according to claim 1, wherein the hot air temperature adjusting unit includes a hot air staying portion between the heat source and the hot air outlet as the temperature smoothing mechanism.   3. The resin according to claim 1, wherein the temperature smoothing mechanism includes a diffusion prevention plate that prevents diffusion of warm air blown to a bent portion of the resin sheet at least on both sides in the longitudinal direction of the warm air outlet. Heating device for bending sheets.   The said temperature smoothing mechanism is equipped with the blowing warm air flow adjustment part which adjusts at least any one of the blowing position and blowing direction of the said warm air, The heating apparatus for resin sheet bending as described in any one of Claims 1-3. .

Images