JP2012250458A - Seal structure of powder slush molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the gap between a mold and a sealant and make a sealing power uniform under a simple construction, as main use purposes.SOLUTION: The sealing structure of the powder slush molding device 11 is such that a sealant 16 which comes into contact with a mold 14 and can seal it, is fitted to the open edge part 13a of a reservoir container 13 which constitutes the powder slush molding device 11. In addition, an inflatable part 25 which can be inflated like a balloon by internally injecting a fluid is disposed in the part, which comes into contact with the mold 14, of the sealant 16.

Description

  The present invention relates to a sealing structure for a powder slush molding apparatus that can eliminate gaps and make the sealing force uniform with a simple configuration.

  A vehicle such as an automobile is provided with an interior panel such as an instrument panel in the front part of the vehicle interior. Some of such interior panels use molded products such as a skin material formed by a powder slush molding device.

  As shown in FIG. 7, the powder slush molding apparatus 1 attaches a heated mold 4 in a sealed state to an opening edge 3a of a reservoir container 3 capable of accommodating a powder material 2, as shown in FIG. In addition, by rotating the reservoir container 3 and the mold 4, the powder material 2 is melted and adhered to the mold 4 to perform molding.

  At this time, if there is a gap 5 between the reservoir container 3 and the mold 4, the powder material 2 leaks from the gap 5, so that as shown in FIG. Is attached with a sealing material 6 for sealing the gap 5 between the mold 4 and preventing leakage of the powder material 2 (see, for example, Patent Document 1).

In the said patent document, as shown in FIG. 10, the thing of the sponge type material which made the part (top part) which contact | connects the metal mold | die 4 flat as the sealing material 6 is used. As shown in FIG. 11, the seal material 6 is attached to the opening edge 3a of the reservoir container 3 by using a pair of attachment plates 7 and fastening fastening members 8 such as bolts and nuts so that the height can be adjusted. (Fixed). At this time, the bolt hole provided on the opening edge 3a side of the reservoir container 3 is a long hole so that the height can be adjusted.
JP 2008-168450 A

  However, the seal structure of Patent Document 1 has the following problems.

  That is, since the molded product such as the skin material described above has a complicated shape, the mold 4 also has a very complicated shape. For this reason, minute gaps 5 are easily formed between the reservoir container 3 and the mold 4, and in order to eliminate these gaps 5, the seal material 6 is attached to the opening edge 3 a of the reservoir container 3. Therefore, it is necessary to make fine height adjustment with accuracy of mm or less. For this reason, the attachment of the sealing material 6 is a precision work that requires skill and takes time. In addition, if there is a portion with a strong sealing force (strong interference portion) or the like in the installed sealing material 6, the sealing material 6 may be damaged at that portion, so that maintenance has to be performed frequently. .

  In order to solve the above-described problems, the present invention provides a sealing structure for a powder slush molding device in which a sealing material that can be sealed against a mold is attached to an opening edge of a reservoir container constituting the powder slush molding device. An inflatable portion that can be inflated into a balloon shape by injecting a fluid therein is provided in a portion of the sealing material that contacts the mold.

  According to the present invention, the following effects can be obtained by the above-described configuration. That is, by injecting a fluid into the inflatable portion and inflating the inflatable portion into a balloon shape, the inflatable inflatable portion can seal the reservoir container and the mold without any gap.

It is sectional drawing of the powder slush molding apparatus concerning the Example of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale similar to FIG. 2 which shows the state which expanded the expandable part. It is sectional drawing of the sealing material which made the hollow part the oblong oval shape, (a) is before inflating, (b) shows the state after inflating. It is sectional drawing of the sealing material which made the hollow part the vertical ellipse shape, (a) is before inflating, (b) shows the state after inflating. It is sectional drawing which shows the state which provided the recessed part in the part which the sealing material of a metal mold | die contacts, (a) is before expanding a sealing material, (b) shows the state after expanding a sealing material. It is sectional drawing of the powder slush molding apparatus concerning a prior art example. It shows the state which rotated the powder slush molding apparatus of FIG. It is sectional drawing of the powder slush molding apparatus of patent document 1. FIG. 10 is a partially enlarged view of FIG. 9. 11 shows a state in which the height of the sealing material of FIG. 10 is adjusted.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings.

  FIGS. 1-6 shows this Example and its modification.

  <Configuration> The configuration will be described below.

  A vehicle such as an automobile is provided with an interior panel such as an instrument panel in the front part of the vehicle interior. Some of such interior panels use molded products such as a skin material formed by a powder slush molding device.

  As shown in FIG. 1, the powder slush molding device 11 attaches a heated mold 14 in a sealed state to an opening edge 13 a of a reservoir container 13 that can accommodate a powder material 12, and the reservoir container 13 and the mold By rotating the mold 14, the powder material 12 is melted and adhered to the mold 14 to perform molding.

  At this time, if there is a gap 15 as shown in FIG. 2 between the reservoir container 13 and the mold 14, the powder material 12 leaks from the gap 15. Is attached with a sealing material 16 for sealing the gap 15 between the mold 14 and preventing the powder material 12 from leaking. That is, the sealing material 16 that can be sealed in contact with the mold 14 is attached.

  The reservoir container 13 is installed inside the powder box 18. The mold 14 is attached to a mold attachment member 19. The reservoir container 13 and the mold 14 are clamped by a clamping cylinder (not shown).

  In addition to the basic configuration as described above, the present embodiment has the following configuration.

(Configuration 1)
As shown in FIGS. 2 and 3, an inflatable portion 25 that can be inflated into a balloon shape by injecting a fluid into the portion (abutting portion) that abuts the mold 14 of the sealing material 16 is provided. .

  Here, the inflatable portion 25 is made of a rubber material or the like that has elasticity and does not leak fluid. The expandable portion 25 is provided with a hollow portion 26 into which fluid is injected. As the fluid injected into the hollow portion 26, working air (cylinder air) of a clamping cylinder (not shown) for clamping the reservoir container 13 and the mold 14 can be suitably used. As a result, the cylinder air supply system can be used as it is, so that it is not necessary to newly provide a fluid supply system.

  The medium (fluid) injected into the hollow portion 26 includes air (including those other than cylinder air), gases such as non-volatile gas, and liquids such as water and oil. Can be used. In short, any fluid can be used.

  Further, with the provision of the expandable portion 25, the structure of the attachment portion of the sealing material 16 with respect to the opening edge portion 13a can be simplified. For example, as shown in the figure, the mounting portion of the sealing material 16 is bifurcated and is sandwiched across both sides of the opening edge 13a, and the space between them is directly fixed using a fastening member such as a bolt or nut. You may make it do. Or similarly to FIG. 10, it is good also as a structure clamped and fixed using a fastening fixing member, such as a pair of attachment plate and a volt | bolt nut. At this time, the bolt hole provided on the opening edge 13a side may be a round hole that cannot be adjusted in height, or may be a long hole that can be adjusted in height.

(Configuration 2)
The hollow part 26 into which the fluid of the inflatable part 25 is injected is formed into a non-circular shape (non-circular hollow part).

  Here, for example, as shown in FIG. 4, the hollow portion 26 may have a horizontally long elliptical cross section (horizontally long elliptical hollow portion 26 a).

  Further, for example, as shown in FIG. 5, the hollow portion 26 can have a vertically long elliptical cross section (vertically long elliptical hollow portion 26 b).

  The cross-sectional shape of the hollow portion 26 is most preferably the above-described elliptical shape, but besides the elliptical shape, an elliptical shape, a rectangular shape, a multiple circular shape, or the like depending on the shape of the mold 14 or the like. And other free shapes.

  Furthermore, although the surface of the expandable part 25 and the hollow part 26 may have the same shape, they can also have different shapes. For example, in FIGS. 4 and 5, the surface of the inflatable portion 25 is semicircular (semicircular surface 25 a) with respect to the elliptical hollow portion 26, and the thickness of the portion (top) contacting the mold 14 is constant. I try to change it as something that is not. Alternatively, in the above, the surface of the inflatable portion 25 can be made different as a flat one or an arcuate one having a large curvature.

  These shapes can be appropriately selected according to the shape and situation of the mold 14. The non-circular shape described above is for the hollow portion 26 before being inflated. The hollow part 26 after inflating may be non-circular or circular. Moreover, when the effect which is mentioned later is not required, you may make the hollow part 26 circular.

(Configuration 3)
As shown in FIG. 6, a recess 31 is provided in a portion of the mold 14 where the sealing material 16 abuts.

  In this case, the recess 31 has a shape that substantially matches the shape of the top of the swellable expandable portion 25.

  <Effect> According to this embodiment, the following effects can be obtained.

  In the powder slush molding device 11, the heated mold 14 is attached in a sealed state to the opening edge 13 a of the reservoir container 13 containing the powder material 12, and the reservoir container 13 and the mold 14 are rotated. To. As a result, the powder material 12 is melted and adhered to the mold 14 to form a molded product.

  At this time, the gap 15 between the reservoir container 13 and the mold 14 is sealed with the sealing material 16, thereby preventing the powder material 12 from leaking from the gap 15.

(Operation effect 1)
By injecting a fluid into the inflatable portion 25 and inflating the inflatable portion 25 into a balloon shape, the inflatable inflatable portion 25 seals between the reservoir container 13 and the mold 14 without a gap. Can do.

  And, by the above, the inflatable portion 25 swelled in a balloon shape can easily and surely follow a minute portion of the mold 14 having a complicated shape and comes into close contact with or pressed against the mold 14, so that it can be inflated. The gap 15 between the portion 25 and the mold 14 can be eliminated, and the powder leakage from the gap 15 can be effectively prevented.

  At this time, the fluid injected into the inflatable portion 25 acts so as to go to a place where the sealing force between the inflatable portion 25 and the mold 14 is weak, so that the sealing force is made uniform. be able to. As a result, a portion with a strong sealing force (strong interference portion) can be eliminated, and troubles such as breakage of the sealing material 16 at the portion can be prevented and maintenance labor can be reduced.

  Moreover, since the sealing material 16 is made to ensure sealing performance by expanding the expandable portion 25 in a balloon shape, the mounting structure and mounting work of the sealing material 16 to the reservoir container 13 can be facilitated. it can. That is, it is possible to eliminate fine height adjustment work and the like.

(Operation effect 2)
By forming the hollow portion 26 of the expandable portion 25 in the sealing material 16 into a non-circular shape, the shape of the sealing material 16 swells by the shape of the hollow portion 26 and the direction of swelling is controlled to improve the sealing performance and follow the complicated shape. It is possible to improve the performance.

  For example, as shown in FIG. 4A, the hollow portion 26 has a horizontally long elliptical cross section, so that the expandable portion 25 is moved upward (in the mold as shown in FIG. 4B). 14 side). That is, the adjustable range of the gap by the expandable portion 25 can be increased.

  Further, for example, as shown in FIG. 5A, the hollow portion 26 has a vertically long elliptical cross section so that a portion (top portion) in contact with the mold 14 as shown in FIG. 5B. Can be greatly inflated to increase the seal area.

  Furthermore, by making the surface of the inflatable part 25 and the hollow part 26 have different shapes, the wall thickness of the inflatable inflatable part 25 can be controlled.

  For example, in the case of FIG. 4, it is possible to increase the thickness (that is, increase the thickness) of the portion (top portion) in contact with the mold 14 so as to be resistant to wear. As a result, it is possible to reduce maintenance work.

  Further, for example, in the case of FIG. 5, by reducing the thickness (that is, reducing the thickness) of the portion (top) in contact with the mold 14, the inflatable portion 25 can be easily swelled. 14 can be further improved in adhesion and followability.

(Operation effect 3)
As shown in FIG. 6 (a), the concave portion 31 is provided in the portion of the mold 14 where the sealing material 16 abuts, so that the space between the mold 14 and the sealing material 16 is as shown in FIG. 6 (b). It becomes possible to increase the sealing area and improve the sealing performance.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. Further, when a plurality of embodiments and modifications are shown, it is needless to say that possible combinations of configurations extending over these are included even if not specifically described. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 11 Powder slush molding apparatus 13 Reservoir container 13a Opening edge part 14 Mold 16 Seal material 25 Expandable part 26 Hollow part 31 Recessed part

Claims (3)

In the seal structure of the powder slush molding apparatus in which a sealing material that can be sealed against the mold is attached to the opening edge of the reservoir container constituting the powder slush molding apparatus,
A seal structure for a powder slush molding device, wherein an inflatable portion that can be inflated into a balloon shape by injecting a fluid therein is provided in a portion of the seal material that contacts the mold.   2. The seal structure for a powder slush molding device according to claim 1, wherein the hollow portion into which the fluid of the inflatable portion is injected has a non-circular shape.   The powder slush molding device sealing structure according to claim 1 or 2, wherein a concave portion is provided in a portion where the sealing material of the mold contacts.