JP2015058567A - Vacuum molding device and resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum molding device and a resin molding which can prevent the contamination of foreign matter into a rib integrally erected on a base.SOLUTION: A vacuum molding device 15 for molding a resin molding comprises: a die body 20 as a molding die having a through hole 21e in a surface thereof and transferring and molding a moldable resin sheet; holding means 34 which detachably holds a plate 14 having a predetermined shape; an air cylinder 31, a piston 32, and a support part 33 which project or evacuate the holding means 34 with respect to the surface 21a of the die body 20 through the through hole 21e; and a vacuum pump 40 which sucks the resin sheet set in an upper opening of the die body 20 to transfer the resin sheet to a molding die and the plate 14.

Description

  The present invention relates to a vacuum forming apparatus and a resin molded product for forming a resin molded product by transferring a resin sheet to a molding die.

  A vacuum molding apparatus is known as an apparatus for integrally molding a resin molded product (see Patent Document 1). The vacuum forming apparatus is an apparatus for forming a resin molded product by adsorbing and transferring a resin sheet to a forming die.

  Here, the conventional resin molded product 1 is shown in FIG. The resin molded product 1 has a configuration in which a box-shaped base portion 1a having an open top surface and a plate-like rib 1b erected perpendicularly to the bottom surface at the center of the bottom surface of the base portion 1a are integrally provided.

  The case where this resin molded product 1 is integrally molded by a vacuum molding apparatus will be described with reference to FIG. FIG. 6 is a side sectional view of the vacuum forming apparatus 2 and the resin molded product 1. However, the resin molded product 1 shown in FIG. 6 is equivalent to the A1-A1 cross-sectional view of the resin molded product 1 shown in FIG.

  A vacuum molding apparatus 2 shown in FIG. 6 projects a rectangular parallelepiped mold body 2a having upper and lower surfaces of the same shape as the flat bottom surface of the base 1a of the resin molded product 1 and four side surfaces of the mold body 2a in the vertical direction. Four vertical frames 2d that form recesses 2b and 2c above and below the mold body 2a by surrounding the four sides without gaps, and a horizontal plate 2e that closes the lower recess 2c to form a closed space 2h, A plate-like standing portion 2f that is erected perpendicularly to the upper surface is provided at the center of the upper surface of the mold body 2a.

In the vacuum forming apparatus 2, a molding die 2g is constituted by the four-side inner surface of the upper recess 2b, the upper surface of the mold body 2a, and the standing portion 2f. Further, a suction port of a vacuum pump (not shown) is inserted into the lower closed space 2h. By performing vacuum suction with a vacuum pump, the closed space 2h becomes negative pressure, and air suction is performed through a plurality of suction holes (not shown) formed through the mold body 2a in the vertical direction.
That is, the resin sheet is set so as to cover the opening of the molding die 2g, and then suction is performed through the plurality of suction holes of the die body 2a by vacuum suction. By this suction, the resin sheet is attracted and transferred to the mold 2g. Thereafter, the transferred resin sheet is cooled and cured, and removed from the mold 2g. Thus, the resin molded product 1 shown in FIG. 5 is completed.

JP 2009-39862 A

  However, in the resin molded product 1 formed as described above, as shown in the cross-sectional view of FIG. 7, the rib 1b is formed by the standing portion 2f of the molding die 2g. A gap G is formed by removing the mark. For example, when the resin molded product 1 is used in an environment exposed to the outside air such as an in-vehicle component, the gap G is free from moisture and the ribs are broken if moisture or water containing moisture enters from the gap G. There is a problem such as.

  The present invention has been created to solve such problems, and provides a vacuum molding apparatus and a resin molded product that can prevent foreign matter from being mixed into a rib that stands integrally with a base portion. Objective.

  In order to solve the above-mentioned problems, the vacuum forming apparatus of the present invention has a through-hole on the surface, a mold for transferring and molding a moldable resin sheet, and a holding means for detachably holding a predetermined-shaped insertion member And a transfer means for projecting or retracting the holding means with respect to the surface of the mold through the through hole, and a transfer for transferring the resin sheet set in the mold to the mold and the insertion member. Means, and after the resin sheet is transferred by the transfer means, the holding means is retracted by the moving means, whereby the insertion member is detached from the holding means.

  According to this configuration, the resin sheet is transferred by the transfer unit in a state where the insertion member protrudes from the surface of the mold and is held by the holding unit. By this transfer, the resin sheet is transferred to the mold and the insertion member, and thereafter, the holding means is detached from the insertion member. For this reason, the protruding insertion member can be left in the transferred resin sheet. The standing part becomes a rib. Therefore, it is possible to form a resin molded product in which the insertion member is inserted into the rib standing on the base without any gap. Since this resin molded product does not have a gap for entering foreign substances such as water and dust as in the prior art, it is possible to prevent damage to the ribs caused by foreign substances entering the gap.

  Further, the resin sheet is transferred again by the transfer means after the insertion member is detached from the holding means.

  According to such a configuration, when the insertion member is left in the rib formed by the transferred resin sheet, even if a gap remains in the portion where the insertion member is held by the holding means, the transfer is performed again. The gap portion is sucked into the mold and the gap disappears. Therefore, a resin molded product without a gap can be molded.

  The apparatus further comprises a temperature adjusting means for heating the mold before transferring the resin sheet to the mold and cooling the mold after the resin sheet is transferred to the mold. .

  According to such a configuration, since the resin sheet is heated before transfer, the resin sheet can be easily molded, and the resin sheet can be quickly adsorbed to the mold and transferred without a gap. Further, if the mold is cooled after the transfer, the resin sheet can be quickly cooled and cured.

  Further, the resin molded product of the present invention is a resin molded product manufactured by the vacuum molding device, wherein the base and the rib standing on the base are integrally formed, and the insertion member is interposed in the rib. It is characterized by being inserted completely.

  According to such a configuration, since the insertion member is inserted into the rib standing on the base portion without a gap, it is possible to prevent foreign matters from being mixed into the gap as in the prior art.

  According to the vacuum forming apparatus according to the present invention, it is possible to manufacture a resin molded product in which no foreign matter is mixed in a rib that stands integrally with the base. Moreover, according to the resin molded product which concerns on this invention, the foreign material mixing in the rib standingly integrated with a base part can be prevented.

(A) is a perspective view which shows the structure of the resin molded product shape | molded with the vacuum forming apparatus which concerns on embodiment of this invention, (b) is A2-A2 sectional drawing of the resin molded product shown to (a). (A) is sectional drawing of the front side which shows the structure of the vacuum forming apparatus which shape | molds the resin molded product which concerns on embodiment of this invention, (b) is sectional drawing of the side surface side of a vacuum forming apparatus. (A) Side sectional view showing a state where the resin sheet is set in the vacuum forming apparatus, (b) Side sectional view showing a state where the resin sheet is transferred to the molding die, (c) Transferred to the molding die It is sectional drawing on the side surface side which shows the state in which the clearance gap was made in the standing part root part of the standing resin sheet. (A) Cross-sectional view on the side surface showing a state where there is no gap in the root portion of the standing plate of the resin sheet, (b) Cross-sectional view on the side surface side showing a state where the resin molded product by resin sheet transfer is removed from the mold. is there. It is a perspective view which shows the structure of the conventional resin molded product. It is sectional drawing of the side surface which shows the structure of the conventional vacuum forming apparatus. It is sectional drawing which shows the structure of the conventional resin molded product.

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. A resin molded product 10 shown in FIGS. 1A and 1B is formed by transferring a moldable resin sheet to a mold. The resin molded product 10 includes a box-shaped base 12 having an open upper surface, ribs 13, and a plate (insertion member) 14. The base 12 and the rib 13 are integrally formed.

  The base portion 12 is composed of a bottom portion 12a having a rectangular shape in plan view and four side portions 12b perpendicular to the bottom portion 12a. The rib 13 is erected on the bottom 12a at the center of the bottom 12a. The rib 13 is formed away from the side portion 12b. The ribs 11 are rectangular in front view in the present embodiment, but may have other shapes. The plate 14 is a member that is inserted into the rib 13 without a gap, and has a plate shape. The plate 14 may be made of any material, but is made of resin in this embodiment.

  As shown in FIGS. 2A and 2B, the vacuum molding apparatus 15 for molding the resin molded product 10 includes a mold body 20, a molding apparatus 30 disposed inside the mold body 20, and a vacuum pump 40. And is configured. Note that the transfer means of this claim is constituted by the vacuum pump 40 and the like.

  The mold main body 20 includes a main body 21, four vertical frames 22 disposed around the main body 21, and a bottom frame 23. The main body 21 has a rectangular parallelepiped shape. A plurality of suction holes 21 c that communicate from the front surface 21 a to the back surface 21 b are formed inside the main body 21. Further, a hollow portion 21 d in which the molding device 30 is disposed is formed inside the main body portion 21. A through hole 21 e communicating with the hollow portion 21 d is formed on the surface 21 a of the main body portion 21. The through hole 21e has a size that allows the holding means 34 to be described later to be inserted.

  The four vertical frames 22 each have a plate shape, project from the upper side and the lower side of the main body 21, and are disposed so as to surround the four sides of the main body 21. In the lower part of one vertical frame 22, an inlet 22 a for arranging the vacuum pump 40 is formed.

  The bottom frame 23 is a plate-like member that covers the lower ends of the four vertical frames 22. A closed space 24 is formed by the main body 21, the four vertical frames 22, and the bottom frame 23.

  The molding device 30 includes an air cylinder 31, a piston 32, a support portion 33, and a holding means 34. The “moving means” in the claims is a portion constituted by the air cylinder 31, the piston 32, and the support portion 33. The molding device 30 is disposed in the bottom frame 23 and is disposed in the hollow portion 21 d of the main body portion 21. The air cylinder 31 is a device that raises and lowers the support portion 33 via the piston 32. The support portion 33 has a rectangular parallelepiped shape, and can move up and down in the hollow portion 21d.

  The holding means 34 is formed in the upper part of the support part 33, and is comprised by the clamping plates 34a and 34a in this embodiment. The sandwiching plates 34a and 34a are arranged at intervals at which the plate 14 can be attached and detached. The holding means 34 can protrude or retract through a through hole 21e formed in the surface 21a. Specifically, when the support portion 33 rises most by driving the air cylinder 31, the tip of the holding means 34 protrudes upward from the surface 21a. On the other hand, when the support portion 33 is lowered most by driving the air cylinder 31, the tip of the holding means 34 is retracted below the surface 21a.

  The vacuum pump 40 is a device that sucks the resin sheet 50 {see FIG. 3A} through the suction hole 21c by vacuum-sucking the closed space 24.

  In the vacuum forming apparatus 15, the surface 21 a of the main body portion 21 and the side surface 22 b of the vertical frame 22 constitute a “molding die” in the claims.

  Note that the vertical movement of the piston 32 by the air cylinder 31 and the start and stop operations of the vacuum suction by the vacuum pump 40 are controlled by a control device (not shown). This control device includes storage means such as a CPU (Central Processing Unit) (not shown), ROM (Read Only Memory), RAM (Random Access Memory) and HDD (Hard Disk Drive), for example, and the CPU writes to the storage means. The above-described control is performed by executing the program.

<Operation of Embodiment>
Next, the operation | movement at the time of shape | molding the resin molded product 10 with the vacuum forming apparatus 15 of this embodiment is demonstrated with reference to FIG.3 and FIG.4.

  However, control of the raising / lowering operation of the piston 32 by the air cylinder 31 shown in FIGS. 3 and 4 and the control of the starting and stopping operations of the vacuum suction by the vacuum pump 40 are performed by a control device (not shown).

  First, as shown in FIG. 3A, the piston 32 of the air cylinder 31 is raised, and the holding plates 34 a and 34 a are placed on the surface 21 a from the through hole 21 e of the main body 21 through the support portion 33 by a predetermined length. Stick out. For example, a robot arm (not shown) supplies and holds the plate 14 to the parallel gaps between the protruding holding plates 34a and 34a. Thereby, the plate 14 is vertically set and held. Thereafter, the resin sheet 50 is placed and set on the upper opening of the mold body 20 by, for example, a robot arm (not shown). As a result, the opening of the mold body 20 is covered with the resin sheet 50.

  Next, when vacuum suction is performed for the first time by the vacuum pump 40, the closed space 24 becomes negative pressure, and the inside of the mold body 20 covered with the resin sheet 50 is vacuumed through the suction hole 21 c. 3B, the resin sheet 50 is attracted to the surface 21a of the main body 21 and transferred to the surface 21a of the main body 21 and the inner side 22b of the vertical frame 22, It is also transferred to the plate 14 and the clamping plates 34a and 34a. After this transfer, the vacuum suction of the vacuum pump 40 is stopped.

  A portion of the resin sheet 50 formed by the sandwiching plates 34a and 34a is referred to as a protruding thick portion 50a. The protruding thick part 50 a is wider than the part formed by the plate 14.

  Next, as shown in FIG. 3 (c), the piston 32 of the air cylinder 31 is lowered, and the clamping plates 34a, 34a protruding from the surface 21a of the main body 21 are lowered below the surface 21a (retracted). ) Accordingly, the plate 14 sandwiched between the sandwiching plates 34a and 34a is separated from the sandwiching plates 34a and 34a, and is in a state of being covered with the resin sheet 50 while the plate 14 is standing. At this time, since the sandwiching plates 34 a and 34 a are retracted, a gap is formed between the protruding thick portion 50 a of the resin sheet 50 and the plate 14.

  Next, when the second vacuum suction is performed by the vacuum pump 40, suction is performed through the suction hole 21c, and the air in the gap between the resin sheet 50 and the plate 14 in the protruding thick portion 50a is sucked.

  As a result, as shown by the arrow Y1 in FIG. 4A, the projecting thick portion 50a is attracted to the surface 21a of the main body 21 and adsorbed, and the gap is eliminated. Therefore, the resin sheet 50 is transferred to the surface of the plate 14, the surface 21 a of the main body 21, and the side surface 22 b of the vertical frame 22 without a gap. After this transfer, the vacuum suction of the vacuum pump 40 is stopped.

  Next, after the resin sheet 50 is cured, when the resin sheet 50 is removed from the mold main body 20 as shown in FIG. 4B, the box-shaped base 12 having an open top surface and the center of the bottom surface of the base 12 Thus, the resin molded product 10 having a shape in which the inside of the rib 13 is clogged with the plate 14 without a gap is obtained.

<Effect of embodiment>
As described above, the vacuum forming apparatus 15 according to the present embodiment has the through hole 21e on the surface 21e, the mold body 20 as a mold for transferring and molding the moldable resin sheet 50, and a plate having a predetermined shape. Holding means 34 for detachably holding 14, a support portion 33 as a moving means for projecting or retracting the holding means 34 with respect to the surface 21 a of the mold body 20 through the through hole 21 e, a piston 32, and an air cylinder 31, The resin sheet 50 set above the mold is provided with a vacuum pump 40 for transferring the resin sheet 50 to the mold 14 and the plate 14.

  Further, after the resin sheet 50 is transferred to the mold by the vacuum pump 40, the holding plates 34a and 34a are retracted from the surface of the mold by the air cylinder 31 to release the holding means 34 from the plate 14, and thereafter The resin sheet 50 was again sucked and transferred by the vacuum pump 40.

  According to this configuration, the resin sheet 50 is transferred to the mold and the plate 14 by the first (first) evacuation. Thereafter, when the holding means 34 is detached from the plate 14, a gap remains in the transferred resin sheet 50 where the upright plate 14 is held by the holding means 34. However, since the resin sheet 50 in the gap portion is sucked to the surface of the mold by the second (second) evacuation, the gap is eliminated.

  Therefore, the base 12 and the ribs 13 erected on the base 12 are integrally molded, and the resin molded product 10 in which the plate 14 is inserted into the ribs 13 without a gap can be formed. As a result, there is no gap in the resin molded product 10 where foreign substances such as water and dust enter. Even when this resin molded product 10 is used in an environment where it is exposed to the outside air such as an in-vehicle component, foreign matter does not enter the resin molded product 10, and the rib 13 caused by foreign matter mixing into the gap as in the conventional case is eliminated. Breakage can be prevented.

<Modification of Embodiment>
The resin molded product molded by the vacuum molding apparatus 15 of the above embodiment is not limited to the resin molded product 10, and may be any other as long as it is integrally provided with a base and a rib standing on the base. The shape may also be

  Further, in the above embodiment, after the vacuum pump 40 is stopped after the first vacuum suction, the holding means 34 holding the plate 14 is lowered from the surface of the mold to remove the plate 14, and then again. Vacuum suction was performed.

  In this process, while the vacuum pump 40 is performing vacuum suction, the clamping plates 34a and 34a may be lowered from the surface of the mold and the plate 14 may be detached. In this process, since the vacuum suction is continued during the separation, the gap formed in the protruding thick portion 50a shown in FIG. 3C is as shown by the arrow Y1 in FIG. The protruding thick portion 50a is eliminated by being attracted to the surface of the mold.

  Moreover, you may provide the temperature control means which has the heater and cooling device which are not shown in the inside of the main-body part 21, in other words, the surface of a shaping | molding die. This temperature adjusting means heats or cools the main body portion 21 to adjust the temperature, thereby heating or cooling the mold surface of the mold and heating or cooling the resin sheet 50 set in the mold. At this time, a thermoplastic resin such as polyethylene or polypropylene is used for the resin sheet 50.

  When such a resin sheet 50 of thermoplastic resin is used, the resin sheet 50 is heated in advance at a predetermined temperature to be ready for molding. Further, it is preferable that the temperature of the mold is heated to a predetermined temperature by the temperature adjusting means. This treatment facilitates the molding of the resin sheet 50.

  If the resin sheet 50 is set on the mold under these conditions and the vacuum pump 40 is evacuated as described above, the resin sheet 50 can be quickly adsorbed to the mold and the plate 14 and transferred without gaps. . Thereafter, if the mold is cooled by the temperature adjusting means, the resin sheet 50 can be quickly cooled and cured.

In the holding means 34 of the above-described embodiment, the plate 14 is sandwiched between the sandwiching plates 34a and 34a. However, other forms may be used as long as the plate 14 can be attached and detached.
Although the embodiments and modifications of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Resin molded product 12 Base part 13 Rib 14 Plate 15 Vacuum forming apparatus 20 Type | mold main body 21 Main body part 21c Suction hole 22 Vertical frame 23 Bottom frame 24 Closed space 30 Molding apparatus 31 Air cylinder 32 Piston 33 Support part 34 Holding means 34a Holding plate 40 Vacuum pump 50 Resin sheet

Claims (4)

A mold having a through hole on the surface and transferring and molding a moldable resin sheet;
Holding means for detachably holding an insertion member of a predetermined shape;
Moving means for projecting or retracting the holding means with respect to the surface of the mold through the through hole;
Transfer means for transferring the resin sheet set in the mold to the mold and the insertion member;
With
After the resin sheet is transferred by the transfer unit, the insertion member is detached from the holding unit by retracting the holding unit by the moving unit. After detaching the insertion member from the holding means,
The vacuum forming apparatus according to claim 1, wherein the resin sheet is transferred again by the transfer unit.   The apparatus further comprises temperature adjusting means for heating the mold before transferring the resin sheet to the mold and cooling the mold after the resin sheet is transferred to the mold. The vacuum forming apparatus according to 1 or 2. A resin molded product produced by the vacuum molding apparatus according to any one of claims 1 to 3,
A resin molded product, wherein a base and a rib standing on the base are integrally formed, and an insertion member is inserted into the rib without any gap.

Images