JPH0585609U - Foam mold - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] The mold structure around the vent hole 23 of the upper mold 5 was improved to improve the fluidity of the foaming resin raw material R and the gas and to eliminate molding defects such as lack of wall. The weight of the thin-walled panel is reduced by lowering the filling rate of the foamed resin raw material R. [Structure] A vent hole 23 for degassing that communicates a narrow molding space C formed between the lower mold 1 and the upper mold 5 with the outside of the upper mold 5 is provided in at least the concave portion 5a of the upper mold 5. Provide so that it opens. A plurality of concave grooves 25 are provided in the concave portion 5 a so as to communicate with the vent hole 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to improvement of a foaming mold, and more particularly to measures for degassing.

[0002]

[Prior Art]

 Conventionally, as a foaming mold, for example, as disclosed in Japanese Patent Laid-Open No. 63-99912, a narrow molding space formed between an upper mold and a lower mold is filled with a foaming resin raw material. There is known a foaming mold for molding a thin panel made of foamed resin.

[0003]

[Problems to be solved by the device]

 However, when molding a thin-walled panel made of foamed resin as described above, the foamed resin raw material flows and fills in a narrow molding space, so the fluidity of the foamed resin raw material deteriorates and the foamed resin raw material is molded. It is difficult to reach every corner of the space, and it is easy to cause meat deficiency.

Therefore, in order to avoid this, it is conceivable to increase the filling rate of the foamed resin raw material, but this increases the amount of the foamed resin raw material used and increases the weight of the thin-walled panel.

Further, since the gas generated from the foamed resin raw material also passes through the narrow molding space, it takes time to reach the vent hole, which makes it difficult to discharge the gas and causes a molding defect.

In particular, when the mat-like fiber reinforcing material such as glass fiber is embedded in the panel body as in the above-mentioned publications, the narrow molding space is further narrowed and the fiber reinforcing material is a foamed resin raw material. It also hinders the flow of gas and gas, making it more difficult for the foamed resin raw material to reach every corner of the molding space and worsening gas emission.

The present invention has been made in view of the above points, and an object thereof is to improve the fluidity of a foamed resin raw material and gas by improving the mold structure around the vent hole of the upper mold. In addition to eliminating molding defects such as lack of wall thickness, the filling rate of the foamed resin raw material is reduced to reduce the weight of thin-walled panels.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the solution means of the present invention comprises an upper mold having a concave portion and a lower mold forming a narrow molding space between the upper mold and the foaming in the molding space. In a foaming mold for filling a thin-walled panel filled with a resin raw material, a vent hole for venting is provided in the upper mold so as to communicate the molding space with the outside of the upper mold so as to open at least in the concave portion. . Further, a plurality of concave grooves is provided in the concave portion so as to communicate with the vent hole.

[0009]

[Action]

 With the above structure, in the present invention, the foamed resin raw material filled in the narrow molding space formed between the upper mold and the lower mold has a plurality of concave grooves formed in the concave portion of the upper mold. The flowability of the foamed resin raw material is improved by that much, and even if there is a mat-shaped fiber reinforcement in the molding space, the foamed resin raw material will smoothly flow to every corner of the molding space. There is no meat deficiency.

Further, since the foamed resin raw material has a good fluidity in the molding space, the foamed resin raw material can be sufficiently spread to every corner of the molding space even if the filling rate is not so high. The amount of raw materials used is reduced and the thin-walled panel becomes lighter.

On the other hand, the gas generated from the foamed resin raw material also reaches the vent hole through the above-mentioned concave grooves, so that the time to reach the vent hole is shortened by that much, and it is smoothly discharged to the outside of the upper mold and molded. It does not cause a defect.

[0012]

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a foaming mold A according to an embodiment of the present invention. In the figure, 1 is a lower mold installed on a base 3, 5 is an upper mold movably arranged above the lower mold 1, and a mold is provided between the upper mold 5 and the lower mold 1. A narrow molding space C is formed in the tightened state, and as shown in FIG. 3, the foaming resin raw material R is filled in the molding space C to mold the thin panel P.

The upper die 5 has piston rods extending below four lifting cylinders 9, 9 ... Installed on a supporting plate 7 above the upper mold 5. It is connected to the tip of 9a and is moved up and down by the synchronized expansion and contraction operations of these lifting cylinders 9, 9 ,. That is, the upper mold 5 is shown by the solid line in FIG. 2 by the synchronized contraction operation of the lifting cylinders 9, 9, so that the upper mold 5 does not interfere with the lower mold 1 during the initial mold opening after foam molding so as not to interfere with it. On the other hand, when the mold is clamped at the time of foam molding, the lift cylinders 9, 9, ... Synchronously extend and descend as shown in FIG.

A support 11 is installed at one end of the base 3 (right side in FIGS. 1 and 2), and an L-shaped rotating arm 13 is provided at one end of the support 11 (see FIGS. 1 and the lower end in FIG. 2) are rotatably connected by a rotary shaft 15 and attached. Further, the other end (the upper end in FIGS. 1 and 2) of the rotating arm 13 is connected to one end side (the right end side in FIGS. 1 and 2) of the support plate 7, whereby the upper mold 5 is It is supported by the support body 11 so as to be rotatable about the rotation shaft 15 within a vertical plane.

Further, two rocking cylinders 17, 17 (only one of which is shown in FIGS. 1 and 2) are installed in the middle of both sides of the base 3 (front-back direction of the paper in FIGS. 1 and 2). The supporting plate 7 is connected to the tip end of the piston rod 17a extending above each swing cylinder 17, and the upper die 5 is rotated by the swing shaft 15 by the synchronized expansion and contraction operations of the swing cylinders 17, 17. It is designed to rotate around a vertical plane. That is, when the upper mold 5 is opened after foam molding, the upper mold 5 is lifted by the contracting operation of the elevating cylinders 9, 9 ,. While turning from the state shown by the solid line in the clockwise direction diagonally upward as shown by the chain double-dashed line in FIG. 2, at the time of mold clamping at the time of foam molding, before lowering by the extension operation of the lifting cylinders 9, 9 ,. As a result of the synchronized contraction of the rocking cylinders 17, 17, the state shown by the two-dot chain line in FIG. 2 is turned diagonally downward in the counterclockwise direction as shown by the solid line in FIG.

A plurality of (only two in FIG. 1 and FIG. 2) insertion holes 19 are formed in the upper mold 5 so as to communicate with the inside and outside of the mold. On the other hand, a plurality of (only two in FIG. 1 and FIG. 2) slide pins 21, 21, ... Are attached to the lower surface of the support plate 7, and the slide pins 21 are located above the insertion holes 19. As shown in the enlarged detail in FIG. 3, the ring-shaped clearance of 0.2 to 0.3 mm is provided between the pin outer circumference and the hole inner circumference as the vent hole 23 for venting gas. Is formed. That is, a plurality of vent holes 23, 23, ... Are formed through the upper mold 5 so as to communicate the molding space C with the outside of the upper mold 5, and the gas generated in the mold during foam molding is vented to each of the vents. It is designed to be discharged from the hole 23 to the outside of the upper mold 5.

Further, each of the insertion holes 19 is composed of a small-diameter portion 19a in the lower half portion and a large-diameter portion 19b in the upper half portion having a larger diameter than the small-diameter portion 19a. In the portion 19b, the distance from the slide pin 21 is large so that the foamed resin raw material R that rises the venthole 23 by the foaming pressure does not adhere to the upper half of the slide pin 21. Further, when the mold is opened, each of the slide pins 21 presses the thin-walled panel P formed as shown in FIG. 2 from above to prevent the thin-walled panel P from adhering to the upper mold 5, and at this time, By the relative movement of the slide pin 21 and the insertion hole 19, the foamed resin material R (resin slag) in the vent hole 23 is automatically removed.

Further, on the molding surfaces of the lower mold 1 and the upper mold 5, concave shaped portions 1 a and 5 a as cavity surface portions and convex shaped portions 1 b as core surface portions corresponding to the shape of the thin panel P are formed. 5b and the vent holes 23 are formed in the concave portion 5a and the convex portion 5b of the upper die 5, respectively. Therefore, a part of the vent holes 23, 23, ... (The center of the mold in FIGS. 1 and 2) is opened in the concave portion 5a of the upper mold 5.

Further, as a feature of the present invention, a plurality of concave grooves 25, 25, ... Are in communication with each other in the concave portion 5a of the upper mold 5, as shown in enlarged detail in FIGS. 3 and 4. Are formed in a checkerboard pattern, and these concave grooves 25, 25, ... Are connected to the vent hole 23 through the concave grooves 25, 25 ,. The gas generated in the molding space C is guided to the vent hole 23.

Next, the behavior of the gas generated during foam molding will be described in the process of molding the foam molded article.

First, in the mold open state in which the upper mold 5 is held in the posture shown by the chain double-dashed line in FIG. 2 by the contraction operation of the lifting cylinders 9, 9, ... And the expansion operation of the rocking cylinders 17, 17. As shown in FIG. 3, a skin material 35 in which a foam layer 33 is integrally formed on the back surface of the solid layer 31 is set in the lower mold 1 with the solid layer 31 facing downward, and further made of glass fiber or the like on top of it. After setting the mat-like fiber reinforcing material 37, a foamed resin material R such as hard urethane foam is filled.

Thereafter, the rocking cylinders 17, 17 are synchronously contracted to hold the upper mold 5 in the posture shown by the solid line in FIG. 2, and then the lifting cylinders 9, 9, ... Are synchronously expanded. The upper mold 5 is placed on the lower mold 1 as shown in FIG.

At this time, since the foamed resin raw material R filled in the narrow molding space C flows through the plurality of concave grooves 25, 25, ... Formed in the concave portion 5 a of the upper mold 5, It is possible to improve the fluidity of the foamed resin raw material R by an amount corresponding thereto, and to smoothly spread the foamed resin raw material R to every corner of the molding space C narrowed by the presence of the fiber reinforcing material 37 to prevent the wall thinning. You can

Further, since the foamed resin raw material R flows well in the molding space C, it is possible to sufficiently spread the foamed resin raw material R to every corner of the molding space C without increasing the filling rate so much. Thus, the amount of the foamed resin raw material R used can be reduced, and a lightweight thin panel P can be obtained.

Thereafter, the foamed resin material R foams according to the mold temperature to generate gas. This gas passes through each vent hole 23 and is discharged to the outside of the upper mold 5.

At this time, since the gas also reaches the vent hole 23 through the concave grooves 25, the time to reach the vent hole 23 can be shortened accordingly, and the gas can be smoothly discharged to the outside of the upper mold 5. The cause of molding defects can be eliminated. Further, since the gas can be guided to the vent hole 23 from the plurality of concave grooves 25, 25, ... Surrounding the vent hole 23 at the same time, the efficiency of gas discharge can be improved.

After that, when the thin-walled panel P is formed after the completion of the foaming of the foamed resin raw material R, the ascending / descending cylinders 9, 9, ... Synchronize and contract, and the upper mold 5 is shown by the solid line in FIG. Raise to posture. At this time, each slide pin 21 relatively moves in the insertion hole 19, and the foamed resin raw material R (resin slag) in the vent hole 23 is automatically removed. As a result, it is possible to improve workability by eliminating the need for removal work by a worker. In addition, the thin panel P can be prevented from being attached to the upper mold 5 by being pressed down by the slide pins 21 from above. Then, the rocking cylinders 17, 17 are synchronously extended to hold the upper mold 5 in the posture shown by the chain double-dashed line in FIG. 2, and the thin panel P is removed from the lower mold 1 for the next foam molding. Prepare

In the above embodiment, the concave groove 25 was formed only in the concave portion 5a of the upper die 5, because the gas is most likely to be accumulated in the concave portion 5a. However, the concave groove 25 may be formed in the other convex portion 5b.

Further, in the above-mentioned embodiment, the concave grooves 25 are arranged in a grid pattern, but the present invention is not limited to this, and may be arranged in a radial pattern, for example.

[0031]

[Effect of the device]

 As described above, according to the present invention, a vent hole communicating between the narrow molding space and the outside of the upper mold is provided so as to open at least in the concave portion of the upper mold, and a plurality of concave holes are formed in the concave portion. Since the recessed groove is provided so as to communicate with the vent hole, the fluidity of the foamed resin raw material is improved by flowing through each of the recessed grooves to improve the fluidity of the foamed resin raw material smoothly and at a low filling rate. The thin-walled panel can be made lighter as well as it is possible to prevent the lack of wall thickness. Further, since the gas generated from the foamed resin raw material is guided to the vent hole through each of the concave grooves, the gas can be smoothly discharged to the outside of the upper mold, and the cause of molding defects can be eliminated.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a closed state of a foaming mold.

FIG. 2 is a vertical cross-sectional view showing an initial state of opening a foaming mold.

FIG. 3 is a vertical cross-sectional view showing an enlarged vent hole portion of a foam molding die.

FIG. 4 is a bottom view showing a concave groove formed in the concave portion of the upper mold.

[Explanation of symbols]

 1 Lower mold 5 Upper mold 5a Concave part 23 Vent hole 25 Concave groove A Foaming mold C Molding space P Thin panel R Foamed resin raw material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B29K 105: 06

Claims (1)

[Scope of utility model registration request] 1. An upper mold having a concave portion and a lower mold forming a narrow molding space between the upper mold and the upper mold, wherein a foamed resin material is filled in the molding space to mold a thin-walled panel. In the foam mold, the upper mold is provided with a vent hole for venting gas that communicates the molding space with the outside of the upper mold so as to open at least in the concave portion, and Is a foaming mold, wherein a plurality of concave grooves are provided so as to communicate with the vent hole.