JP2005007818A - Method and mold for molding foamed resin molded body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the property of the outward appearance of a vertical wall flange part and also to increase strength and a weight saving rate, by preventing a silver streak in the vertical wall flange part, in a method and a mold for molding a foamed resin molded body which use an injection molding process. <P>SOLUTION: A sealing mechanism part 70 having an air release function is provided on the periphery of a product cavity C (periphery of a shear structure part A) of the mold 40 composed of a movable-side mold 50 and a stationary-side mold 60. On the occasion of clamping the two molds 50 and 60, the product cavity C is controlled to be put in an airtight state by this sealing mechanism part 70 and a foaming resin material M is supplied from a general part cavity C1 into a vertical wall part cavity C2 in a state that foaming is suppressed. Thereby the silver streak is prevented. Just before completion of injection and filling of the foaming resin material M, moreover, the air in the product cavity C is released by operating a sealing frame 71 to move back or by operating a release valve 73 to release. Thereby a short shot is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method and a molding die for a foamed resin molded body using an injection molding method, and in particular, a foamed resin molded body capable of enhancing strength and appearance performance in a vertical wall flange portion of the foamed resin molded body. The present invention relates to a molding method and a molding die.
[0002]
[Prior art]
FIG. 12 shows an automotive door trim 1 mounted on the indoor side of a door panel (not shown). Since this door trim 1 is lightweight, has excellent impact resistance, and is inexpensive, polypropylene (PP ) Many resin molded products are formed by molding a foamed resin material in which a foaming agent is mixed into a resin into a required shape. The door trim 1 is integrally formed with an armrest portion 1a that bulges toward the indoor side. A door pocket opening 1b is formed below the armrest portion 1a, and a speaker grill is provided on the front side thereof. 1c is provided integrally or separately.
[0003]
And the conventional molding method which shape | molds the door trim 1 which uses this kind foaming resin molding to a required shape is demonstrated based on the process explanatory drawing shown in FIG. 13, and the time chart figure of the metal mold | die shown in FIG.
[0004]
That is, the molding die 2 is roughly constituted by a cavity die 3 and a core die 4, and is clamped by being driven in a direction in which the cavity die 3 is close to the core die 4. In the initial mold state at the time of mold clamping, as shown in FIG. 13A, the mold position of the cavity mold 3 is a1, and the mold clearance in the product cavity C is 2.0 mm. Is set.
[0005]
In this state, the foamed resin material M is injected and filled into the product cavity C through a resin passage from an unillustrated injection machine. FIG. 13B shows a state after the injection filling time (t1) has elapsed. That is, after the foamed resin material M is filled in the product cavity C, a delay time (t2) of 0 to 10 seconds is allowed to elapse.
[0006]
Thereafter, the cavity mold 3 is raised (see FIG. 13C). The mold position of the cavity mold 3 at this time is a2, and this a2 is set to about 3.6 mm, for example, and after the cooling time (t3) has elapsed, the door trim 1 that has undergone foam molding is removed from the mold. Just do it.
[0007]
In the injection filling process shown in FIG. 13 (a), the mold clearance is set thinner than a predetermined position, and the mold is moved in the mold opening direction by the resin pressure or the operation of the mold during the filling of the foamed resin material M. There has also been proposed a method of preventing the appearance of defects such as silver streaks from occurring on the product surface (see, for example, Patent Document 1).
[0008]
[Patent Document 1]
JP 2002-120252 A (Page 9, FIG. 1)
[0009]
[Problems to be solved by the invention]
As described above, in the conventional method for molding a foamed resin molded body, the general part of the foamed resin molded body (part that becomes a product surface having a surface that is perpendicular to the movable direction of the mold) is shown in FIG. As shown in c), by moving the mold, the thickness of the foamed resin molded body can be increased and the rigidity can be enhanced. However, the vertical wall flange portion (parallel to the movable direction of the mold) can be obtained. With respect to the portion having a surface, the plate thickness cannot be increased due to the movement of the mold due to the mold structure, and the rigidity cannot be maintained well. As a countermeasure against this, the thickness of the vertical wall flange portion is set to be thick so that desired rigidity can be obtained from the initial stage.
[0010]
However, in the injection filling process in FIG. 13A, when the plate thickness of the vertical wall flange portion is set to be thick, the resin pressure is rapidly released because the mold clearance is wider than the general portion as shown in FIG. As a result, foaming is started, and silver streaks are prominently generated in the vertical wall flange, which is a major factor that deteriorates the appearance performance of the product. As countermeasures, it has been pointed out that the post-coating is necessary to hide the silver streak, the coating cost is increased, and a coating process is added, resulting in a significant cost increase.
[0011]
The present invention has been made in view of such circumstances, and is a molding method and a molding die of a foamed resin molded body for molding a foamed resin molded body by an injection molding method, and the general part of the foamed resin molded body is The purpose of the present invention is to provide a molding method and a molding die for a foamed resin molded body that can enhance the strength and appearance performance of the vertical wall flange portion, can eliminate the post-coating process, etc., and are advantageous in terms of cost. And
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention method injects a foamed resin material into a product cavity defined between a movable mold and a fixed mold, and then foams the foamed resin material. A foamed resin molded body that is molded into a required shape, and has a vertical wall having a thickness that is substantially equal to or greater than the thickness of the general part at the entire peripheral edge of the general part that is the product surface or a part of the peripheral part. In the method of molding a foamed resin molded body provided with a flange portion, after the movable side mold and the fixed side mold are clamped, when the foamed resin material is injected and filled into the product cavity, along the outer periphery of the product cavity. When the foamed resin material flows from the general cavity to the vertical wall cavity, the internal pressure in the product cavity increases, suppressing foaming of the foamed resin material. An injection filling process of foamed resin material that fills the foamed resin material so that air is released to the outside from the end of the vertical wall cavity by the air release action of the seal mechanism immediately before completion and the excessive internal pressure rise in the product cavity is regulated After the foam resin material is injected and filled into the product cavity, the movable mold is forcibly moved in the mold opening direction to secure a foam space in the general cavity of the product cavity, and the foam reaction of the foam resin material And a foam molding step of a foamed resin molded body that is foam-molded to a desired thickness.
[0013]
Furthermore, the molding die used for the method of the present invention is a molding die of a foamed resin molded body in which a vertical wall flange portion is integrated with the entire peripheral length of the general portion that becomes the product surface or a part of the peripheral portion. The mold is connected to a movable mold that can move in a predetermined stroke in the direction of mold clamping and mold opening, a fixed mold that forms a product cavity of a desired shape with the movable mold, and a fixed mold And an injection machine for supplying the foamed resin material into the product cavity, and a seal mechanism provided on the outer periphery of the product cavity and having an air release function.
[0014]
Here, the movable side mold in the molding mold moves by a predetermined stroke between the mold clamping position and the mold opening position by driving the cylinder. On the other hand, the fixed-side mold is provided with resin passages such as a manifold and a gate in order to supply a foamed resin material into a product cavity from a continuous injection machine.
[0015]
Further, the product cavity defined between the movable side mold and the fixed side mold is set corresponding to the product shape. For example, when the product is composed of a general part that becomes the product surface and a full length of the periphery, or a vertical wall flange part provided at a part of the peripheral part, the general part cavity and the vertical wall part cavity are set. Yes.
[0016]
Furthermore, the molding die used in the present invention employs a shear structure along the periphery of the movable side die and the stationary side die so that the foamed resin material does not leak outside the product cavity. The seal mechanism disposed along the outer periphery of the shear structure is provided with an air release mechanism so that air can be discharged to the outside just before filling the product cavity with the foamed resin material.
[0017]
As this air release mechanism, a sealing frame that seals between a fixed mold and a movable mold is driven by a cylinder in a direction away from the mold surface, or a product cavity is provided at a required position of the sealing frame. A release valve for releasing the air in the product cavity when the internal pressure reaches a predetermined pressure or more may be provided.
[0018]
Thus, according to the present invention, if the foamed resin material is injected and filled into the product cavity defined between the two molds after the movable side mold and the fixed side mold are clamped, the foamed resin material is generally used. It flows from the main cavity to the vertical wall cavity, but at this time, it flows from the general cavity into the vertical wall cavity by the sealing action of the seal mechanism along the outer periphery of the product cavity, that is, the outer periphery of the shear structure of the mold. In the foamed resin material, the filling of the foamed resin material is completed in a state where foaming is suppressed by the counter pressure effect.
[0019]
In addition, since the air in the product cavity is released immediately before the filling of the foamed resin material, the foamed resin material smoothly spreads to the end of the product cavity, so that a short shot or the like does not occur.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a method for molding a foamed resin molding and a molding die according to the present invention will be described in detail with reference to the accompanying drawings.
[0021]
1 and 2 are a front view and a cross-sectional view of an automobile door trim having a door trim lower made of a foamed resin molded body formed by applying the method of the present invention, and FIG. 3 is a molding die for a foamed resin molded body according to the present invention. FIG. 4 is a plan view of a stationary mold in the molding die, FIG. 5 is a time chart of a movable mold in the method for molding a foamed resin molding according to the present invention, 6 to 9 are explanatory views showing respective steps of the method for molding a foamed resin molding according to the present invention, and FIGS. 10 and 11 show a second embodiment of the molding die for the foamed resin molding according to the present invention. It is each structure explanatory drawing.
[0022]
In FIG. 1 and FIG. 2, the automobile door trim 10 is composed of an upper and lower divided body of a door trim upper 20 and a door trim lower 30. An inside handle escutcheon 11 is attached to the door trim upper 20, and a pull handle 12 and a power window switch finisher 13 are attached to an armrest portion on which an occupant places an elbow. On the other hand, the door trim lower 30 is provided with a pocket opening 14 of a door pocket that can accommodate equipment, and a speaker grill 15 is provided integrally or separately on the front side thereof.
[0023]
Further, as shown in FIG. 2, the door trim upper 20 and the door trim lower 30 are configured by a laminated structure in which a skin 22 is pasted on the surface of a resin core 21, as shown in FIG. 2. Synthetic resins used as the material of the resin core material 21 include polyethylene resins, polypropylene resins, polystyrene resins, polyethylene terephthalate resins, polyvinyl alcohol resins, vinyl chloride resins, ionomer resins, polyamide resins, acrylonitrile / A butadiene / styrene (ABS) resin, a polycarbonate resin, or the like may be appropriately selected, and a filler such as talc, clay, or wood powder may be mixed into the synthetic resin as desired.
[0024]
On the other hand, the skin 22 is made of a synthetic resin sheet such as a thermoplastic elastomer resin represented by TPO (thermoplastic olefin), or a synthetic resin sheet such as a laminated sheet material lined with a cushion layer such as polyethylene foam on the back side of the TPO sheet. it can.
[0025]
Further, in order to mold the door trim upper 20 into a desired shape, the injection molding method and the mold press molding method are suitable in consideration of mass productivity. That is, the outer skin 22 is set in a molding die, and the resin core material 21 is molded into a desired curved shape by injection filling the molten resin after the mold clamping or immediately before the mold clamping. The skin 22 can be integrally attached to the surface side.
[0026]
On the other hand, the door trim lower 30 uses a foamed resin molded body in the present invention, and a foaming agent is mixed in the synthetic resin. For example, usable synthetic resins include polyethylene resins, polypropylene resins, polystyrene resins, polyethylene terephthalate resins, polyvinyl alcohol resins, vinyl chloride resins, ionomer resins, polyamide resins, acrylonitrile / butadiene / styrene ( (ABS) resin, polycarbonate resin, etc. A synthetic resin in which an organic foaming agent such as azodicarbonamide or an inorganic foaming agent such as sodium bicarbonate is mixed is used.
[0027]
The door trim 10 shown in FIGS. 1 and 2 can obtain a good product appearance due to the accent effect on the appearance of the door trim upper 20 and the door trim lower 30, and can achieve a compact molding die. By constituting the door trim lower 30 from the foamed resin molded body, it greatly contributes to weight reduction.
[0028]
By the way, this door trim lower 30 is integrally formed with a vertical wall flange portion 30b bent toward the panel P side on both sides and the lower edge of the general portion 30a with respect to the general portion 30a serving as the product surface. The bending angle of the vertical wall flange portion 30b with respect to the general portion 30a may be set to a bending angle equal to or smaller than the illustrated 90 ° angle as the maximum angle. In particular, when the present invention is applied, the strength and appearance of the vertical wall flange portion 30b are maintained satisfactorily. Therefore, the tip of the vertical wall flange portion 30b is in close contact with the panel P, and meandering in the direction of the arrow in the figure is also performed. Since it does not occur, the appearance appearance can be improved and the alignment accuracy with respect to the components can be maintained well.
[0029]
The method of the present invention is characterized by the molding method of the door trim lower 30 (foamed resin molding) and the molding die 40 used therein. First, the configuration of the molding die 40 will be described with reference to FIGS.
[0030]
The molding die 40 used in the present invention is generally composed of a movable side die 50 and a fixed side die 60. The movable side mold 50 is configured to be movable in a predetermined stroke clamping direction and a mold opening direction by a press ram 51, and the fixed side mold 60 is a foamed resin supplied from a continuous injection machine 61. A resin passage 62 for feeding the material M into the product cavity C is set.
[0031]
Further, in the molding die 40 according to the present invention, the shear structure portion (matching A) prevents the foamed resin material M from leaking from the product cavity C to the outside when the movable die 50 is clamped. The molding die 40 according to the present invention is characterized in that a sealing mechanism portion 70 is provided along the outer periphery of the shear structure portion A to seal both the dies 50 and 60 in an air tight manner. It is a structural feature.
[0032]
The seal mechanism 70 supports the seal frame 71 and a drive cylinder 72 that supports the seal frame 71 and moves the seal frame 71 forward and backward in the same direction as the clamping and opening of the movable mold 50. It is composed of In this embodiment, since the sealing frame 71 is pressed against the mold surface of the movable mold 50, an elastic body 71a such as silicone rubber that seals air and does not deform even when repeated pressure is applied, and a metal body 71b. 4 is provided along the outer periphery of the product cavity C (the outer periphery of the shear structure portion A), as shown in FIG. The product cavity C defined between the movable mold 50 and the fixed mold 60 includes a general cavity C1 and a vertical wall cavity C2 in order to obtain the shape of the door trim lower 30. Yes.
[0033]
Next, a molding method for molding the door trim lower 30 using the molding die 40 will be described in detail based on the time chart of FIG. 5 and the process explanatory diagrams shown in FIGS. 6 to 9.
[0034]
In FIG. 5, an outline of the operation of the movable mold 50 will be described. First, the movable mold 50 is clamped from the mold opening position (a) to the bottom dead center (b) by driving the press ram 51. Then, after the mold clamping, injection filling of the foamed resin material M is started. Further, as will be described later, when the movable mold 50 is clamped, the outer periphery of the shear structure A is sealed by the seal mechanism 70, so that the inside of the product cavity C is airtight. .
[0035]
When the filling of the foamed resin material M is completed, the air in the product cavity C is released to the outside by the action of the seal mechanism unit 70. In addition, the timing which releases air is shown by the code | symbol (c). Further, after the filling of the foamed resin material M is completed, the movable side mold 50 is opened in the mold opening direction (d) to (e), a foaming space is secured in the general part cavity C1, and the foaming reaction of the foamed resin is performed. (F) to (g), the mold is opened and the molding of the door trim lower 30 is completed.
[0036]
Next, each step of the method for forming the door trim lower 30 will be described below. First, in the injection filling process of the foamed resin material M, as shown in FIG. 6, the movable-side mold 50 has reached the bottom dead center, and in particular, the clearance of the general cavity C1 in the product cavity C is the same as in the figure. The foamed resin material M is narrowly set as indicated by a, and the foamed resin material M flows from the general cavity C1 of the product cavity C toward the peripheral vertical wall cavity C2 as indicated by an arrow in the figure in a state where foaming is suppressed. .
[0037]
At this time, since the seal mechanism portion 70 is disposed along the shear structure portion A on the outer periphery of the product cavity C, since the product cavity C is particularly adjusted to air tight, the foamed resin material M is a vertical wall. When flowing into the part cavity C2, the air in the product cavity C is pushed into the foamed resin material M, counter pressure is applied, and the clearance of the vertical wall part cavity C2 is larger than the clearance of the general part cavity C1 in the product cavity C. Even in this case, the foamed resin material M flows into the vertical wall portion cavity C2 while maintaining the internal pressure of the product cavity C appropriately.
[0038]
Then, as soon as the filling of the foamed resin material M is completed, as shown in FIG. 7, the drive cylinder 72 in the seal mechanism 70 is contracted, and the seal frame 71 is retracted in the direction of the arrow in the drawing, A gap is formed between the frame 71 and the mold surface of the movable mold 50, an air tight state can be avoided on the outer periphery of the shear structure A, and the internal pressure of the resin when the filling of the foamed resin material M is completed increases excessively. Can be prevented. Therefore, molding defects such as short shots can be prevented as much as possible by adding an air release function to the seal mechanism 70.
[0039]
Thereafter, as shown in FIG. 8, the movable die 50 is moved in the direction of the arrow in FIG. 8, that is, the mold opening direction by driving the press ram 51, and the clearance of the general cavity C <b> 1 in the product cavity C is The foaming space S is secured so as to be substantially equal to the clearance of the cavity C2. Next, as shown in FIG. 9, the foamed resin material M is foamed in the general cavity C <b> 1 so as to fill the foaming space S, and the molding of the door trim lower 30 is completed.
[0040]
As described above, according to the method of the present invention, the seal mechanism portion 70 having the air release function is disposed along the outer periphery of the shear structure portion A along the periphery of the product cavity C. Since the air tight state can be surely achieved, even if the clearance of the vertical wall portion cavity C2 is set large, there is no occurrence of foaming irregularities or appearance defects such as silver streaks, and the vertical wall flange portion 30b has a good appearance. Can be formed.
[0041]
Further, since the air release function is provided to the seal mechanism 70, short shots can be prevented in advance by releasing the air to the outside of the product cavity C immediately before the filling of the foamed resin material M is completed, and the longitudinal direction with good rigidity and appearance performance. There is an advantage that the wall flange portion 30b can be easily formed.
[0042]
Next, FIGS. 10 and 11 show a second embodiment of the present invention. In this molding die 40, both the movable side die 50 and the stationary side die 60 are clamped in a state where both of them are clamped. The sealing frame 71 that seals between the molds 50 and 60 in an air tight state is not cylinder driven as in the first embodiment, but is fixed to the mold surface of the fixed-side mold 60 in the second embodiment. ing.
[0043]
In a state where both molds 50 and 60 are clamped, the air tight state is maintained by the sealing frame 71, so that the foamed resin material M is transferred from the general cavity C1 of the product cavity C to the vertical wall cavity C2. When flowing, the air in the product cavity C is pushed into the foamed resin material M, and the foamed resin material M is filled in a state where foaming is suppressed by the counter pressure effect. No foaming irregularities occur. This is the same as in the first embodiment.
[0044]
Further, in order to prevent short shots just before the filling of the foamed resin material M, the sealing frame 71 is moved backward by driving the cylinder in the first embodiment. However, in this second embodiment, a plurality of points of the sealing frame 71 are used. When the internal pressure of the product cavity C is excessively increased so that the internal pressure of the product cavity C does not exceed a certain pressure, the internal pressure is always kept by releasing the release valve 73 and releasing the air to the outside. It is adjusted to be constant.
[0045]
Therefore, the resin is filled to the end side of the vertical wall portion cavity C2 in the product cavity C in a short time, and defects such as insufficient rigidity due to short shot do not occur. Furthermore, when the release valve 73 is used, the pressure for releasing the gas can be adjusted for each part. For example, the release pressure of the gas can be adjusted by replacing the release valve 73 or using a release valve 73 of a variable pressure type. As a result, silver streaks and short shots can be prevented, which is superior to the first embodiment.
[0046]
【The invention's effect】
As described above, the molding method and the molding die of the foamed resin molding according to the present invention are provided with the seal mechanism portion having an air release function along the outer peripheral portion of the product cavity, and at the time of mold clamping, This seal mechanism maintains the air tight state of the product cavity and prevents sudden release of resin pressure when the resin moves from the general cavity to the vertical wall cavity even if the vertical wall cavity clearance is set to be thick. In addition, since molding defects such as silver streaks and uneven foaming are prevented, good appearance performance can be obtained, post-coating is not required, and the painting process can be eliminated, thereby leading to an effect of reducing costs.
[0047]
Furthermore, according to the molding method and molding die of the foamed resin molded body according to the present invention, a seal mechanism portion is provided on the outer periphery of the shear structure portion along the periphery of the product cavity, and when the foamed resin material is filled by the seal mechanism portion, The counter pressure is applied to fill the resin in a state where foaming is suppressed, and the air release action of the seal mechanism releases the air to the outside immediately before the completion of filling, thereby preventing short shots. Therefore, sufficient expansion ratio and expansion density can be obtained at the end part of the vertical wall flange, and appropriate rigidity and weight reduction can be achieved at the vertical wall flange, and molding defects such as short shots can be prevented. , It has the effect of maintaining a good shape over a long period of time.
[Brief description of the drawings]
FIG. 1 is a front view showing an automobile door trim using a door trim lower formed by applying the method of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an overall view showing a first embodiment of a molding die for a foamed resin molding according to the present invention.
4 is a plan view of a fixed mold in the molding mold shown in FIG. 3. FIG.
FIG. 5 is a time chart showing the operation of the movable side mold when molding the door trim lower using the molding mold shown in FIG. 3;
6 is an overall view showing a state when the foamed resin material is filled in the door trim lower molding method using the molding die shown in FIG. 3; FIG.
7 is an explanatory view showing a state immediately before completion of filling of the foamed resin material in the door trim lower molding method using the molding die shown in FIG. 3; FIG.
8 is an explanatory view showing the mold opening operation of the movable side mold in the door trim lower molding method using the molding mold shown in FIG. 3; FIG.
9 is an explanatory view showing a foam molding process of a foamed resin material in a door trim lower molding method using the molding die shown in FIG. 3;
FIG. 10 is an explanatory view showing a configuration of a second embodiment of a molding die according to the present invention.
11 is a plan view of a fixed side mold in the molding mold shown in FIG.
FIG. 12 is a front view showing a conventional automobile door trim.
FIGS. 13A and 13B are explanatory views showing (a) an initial mold state, (b) a mold state after completion of resin filling, and (c) a mold state during foam molding in a conventional method for molding a door trim for an automobile. is there.
FIG. 14 is a time chart showing the operation of a mold in a conventional molding die.
FIG. 15 is an explanatory view showing a defect state of a vertical wall flange portion in a conventional molding method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Door trim 20 for automobiles Door trim upper 30 Door trim lower 30a General part 30b Vertical wall flange part 40 Molding die 50 Movable side die 51 Press ram 60 Fixed side die 61 Injection machine 62 Resin passage 70 Seal mechanism part 71 Sealing frame 71a Elasticity Body 71b Metal body 72 Drive cylinder 73 Release valve C Product cavity C1 General cavity C2 Vertical wall cavity M Foamed resin material

Claims (4)

After the foamed resin material (M) is injected and filled into the product cavity (C) defined between the movable mold (50) and the fixed mold (60), the foamed resin material (M) A foamed resin molded body (30) formed by foaming and molding into a required shape, and the overall length of the general part (30a) that becomes the product surface, or the thickness of the general part (30a) approximately at the part of the periphery In the molding method of the foamed resin molded body (30) provided with the vertical wall flange portion (30b) having the same or greater thickness,
After the movable side mold (50) and the fixed side mold (60) are clamped, when the foamed resin material (M) is injected and filled into the product cavity (C), it follows the outer periphery of the product cavity (C). When the foamed resin material (M) flows from the general part cavity (C1) into the vertical wall part cavity (C2), the internal pressure in the product cavity (C) is In addition to suppressing foaming of the foamed resin material (M), air is released to the outside from the end of the vertical wall cavity (C2) by the air release action of the seal mechanism (70) just before the filling, and the product cavity (C) An injection filling process of the foamed resin material (M) for filling the foamed resin material (M) so as to regulate an excessive increase in internal pressure;
After injecting and filling the foamed resin material (M) into the product cavity (C), the movable mold (50) is forcibly moved in the mold opening direction, and the general cavity (C1) in the product cavity (C) A foam molding step of a foamed resin molded body (30) that secures a foam space (S) and foam-molds to a desired thickness by a foaming reaction of the foamed resin material (M),
A method for molding a foamed resin molded article, comprising: In the molding die (40) of the foamed resin molded body (30) in which the vertical wall flange part (30b) is integrated with the entire length of the peripheral part of the general part (30a) or the part of the peripheral part as the product surface,
The mold (40) includes a movable side mold (50) movable in a predetermined stroke in the direction of mold clamping and mold opening, and a product cavity (C) having a desired shape between the movable side mold (50). A fixed-side mold (60) that forms a mold, an injection machine (61) connected to the fixed-side mold (60) for supplying the foamed resin material (M) into the product cavity (C), and a product cavity A molding die for a foamed resin molded body, which is provided on the outer periphery of (C) and includes a seal mechanism portion (70) having an air release function. The seal mechanism (70) is provided between the mold surfaces of the movable mold (50) and the fixed mold (60), and when both molds (50, 60) are clamped, both molds (50 , 60) and a drive cylinder (72) for driving the seal frame (71). Mold. The sealing mechanism (70) includes a sealing frame (71) that seals between the two molds (50, 60) along the outer periphery of the two molds (50, 60), and a product cavity ( 3. The release valve (73) provided in the sealing frame (71) for releasing air to the outside when the internal pressure in C) reaches a predetermined pressure or more. Molding mold for foamed resin moldings.

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