JP2012254567A - Method of manufacturing foamed resin molded article, and joint structure of the foamed resin molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a foamed resin molded article which has precise mounting holes in dimension, shape and formed position and a joint structure of the foamed resin molded article.SOLUTION: A movable mold D2 has protrusions 50 for forming a plurality of mounting holes 4 at an opposite mold face against a stationary mold D1, and the stationary mold D1 has recesses 51 for storing ends of the protrusions 50 at an opposite mold face against the movable mold D2 and annular grooves 52 for forming a plurality of ribs 3 at the outer peripheral edge of the mounting holes 4. A forming space is formed between the movable mold D2 and the stationary mold D1 by retreating the movable mold D2 at a predetermined stroke length L in a foaming process, and a foamed resin molded article 1 provided with the mounting holes 4 and the outer peripheral edges of the ribs 3 by foaming it. A shape deforming of the mounting holes 4 generated when foaming in a radial direction is prevented by not completely slipping out the ends of the ribs 3 which are formed at the stage of semi-molded article 10 from the annular grooves 52 of the stationary mold D1.

Description

  The present invention relates to a method for manufacturing a foamed resin molded product having an attachment hole, and a joining structure for attaching and joining the foamed resin molded product to another resin molded product using the attachment hole.

  Luggage side trim is known as an interior part for vehicles. The luggage side trim is mounted on the interior surface of the side wall panel of the luggage room of the vehicle. For example, as shown in FIG. 4, a trim upper T1 manufactured as a foamed resin molded product, The trim lower T2 manufactured as a resin molded product is joined.

  Conventionally, the foamed resin molded product such as the trim upper T1 described above can be manufactured by a manufacturing method disclosed in Patent Document 1, for example. The manufacturing method disclosed in the same document 1 is a method of manufacturing a foamed resin molded article using a movable mold (2) and a fixed mold (1) opposite to the movable mold (2) (reference numerals in parentheses are patents). It is the code | symbol used in the literature 1. The following is also the same in the column of this background art. This manufacturing method specifically manufactures a foamed resin molded article by the following << filling process >> and << foaming process >>.

《Filling process》
In the filling process, the movable mold (2) and the fixed mold (1) are clamped, and the foamed resin material is placed in the cavity (3) defined by the opposing mold surfaces of both molds (1, 2). Is injected and filled to form an unfoamed semi-molded product (see FIGS. 1A and 1B of the document 1).

《Foaming process》
In the foaming step, after completion of the filling step, the movable mold (2) is moved backward by a predetermined stroke length to form a foaming space between the movable mold (2) and the fixed mold (1), and The foamed resin molded product is obtained by foaming the unfoamed semi-molded product in the formed foaming space (see FIG. 1 (c) of the same document 1).

  When manufacturing a foamed resin molded product with mounting holes using the manufacturing method, for example, as shown in FIG. 5A, in a mold including a movable mold D2 and a fixed mold D1, Protrusions 50 for forming attachment holes are provided on the opposing mold surface of the movable mold D2 (surface facing the fixed mold D1).

  In the filling step, the movable mold D2 and the fixed mold D1 are clamped in a state where the tip of the protrusion 50 is in contact with the fixed mold D1, and the molds D1 and D2 face each other. A foamed resin material is injected and filled into the cavity C defined by the mold surface, so that an unfoamed semi-molding having an attachment hole 4 corresponding to the body diameter of the protrusion 50 as shown in FIG. Article 10 is molded. Thereafter, through the foaming step, the foamed resin molded product 1 having the attachment holes 4 as shown in FIG. 5C is obtained. The unfoamed semi-molded product 10 has a skin layer 12 whose front and back surfaces are cooled and hardened by contact with a mold (movable mold D2 and fixed mold D1). The inside is an unfoamed foamed resin material M (injected and filled into the cavity C).

  However, according to the method of manufacturing the foamed resin molded product 1 having the mounting holes 4 using the conventional molds (movable mold D2 and fixed mold D1) described above, the diameter of the mounting holes 4 is the design dimension. The mounting hole 4 may be larger in diameter, the formation position of the mounting hole 4 may be shifted from the design position, or the edge of the mounting hole 4 may be sag as shown in FIG. 5C. There exists a problem that the precision of the dimension of the hole 4, a shape, and a formation position is bad. The main cause is that the force in the direction away from the protrusion 50 (the force indicated by the arrow A in FIG. 5C) is generated during the foaming of the semi-molded product 10 in the foaming step of FIG. This is because the deformation in the radial direction of the mounting hole 4 occurs by acting on the foamed resin material being foamed around.

  By the way, in the case where the foamed resin molded product 1 (having the mounting holes 4) manufactured as described above is attached and joined to a resin molded product manufactured separately from this, FIG. 6 (a) or (b) ) After the boss 5 standing on the back side of the resin molded product 2 is inserted into the mounting hole 4 of the foamed resin molded product 1 (see FIG. 5B), the boss 5 is fastened. As an operation, for example, a method of performing a caulking process by heat melting on the tip of the boss 5 can be considered. However, since the accuracy of the size, shape, and formation position of the mounting hole 4 is poor as described above, the foamed resin molded product 1 and the resin molded product 2 can be understood from the comparison between FIGS. 6 (a) and 6 (b). There is a problem that the fastening position is shifted, the fastening position is not stable, and the assembly accuracy of the foamed resin molded product 1 and the resin molded product 2 is deteriorated.

JP 2002-120252 A

  The present invention has been made to solve the above-mentioned problems, and its purpose is to produce a foamed resin molded product having a mounting hole with a good size, shape, and forming position accuracy, and a method for producing the foamed resin molded product. It is to provide a joint structure.

  In order to achieve the above object, a method for producing a foamed resin molded product according to the present invention is a method for producing a foamed resin molded product having a mounting hole by using a movable mold and a fixed mold facing the movable mold. The movable mold has a protrusion for forming the mounting hole on a mold surface facing the fixed mold, and the fixed mold is a mold surface facing the movable mold. An annular groove for forming a rib on the outer peripheral edge of the mounting hole, and the movable mold in a state where the tip of the protrusion of the movable mold is in contact with the mold surface of the fixed mold The fixing mold and the mold are clamped, and a foamed resin material is injected and filled into cavities defined by opposing mold surfaces of the two molds, thereby providing the mounting hole and the outer peripheral rib. After molding an unfoamed half-molded product, by operating the movable mold backward by a predetermined stroke length, A foaming space is formed between the movable mold and the fixed mold, and the unfoamed semi-molded product is foamed in the formed foaming space, whereby the mounting hole and the outer peripheral rib The tip of the rib formed at the stage of the semi-molded product is fixed between the retraction operation of the movable mold and the completion of foaming of the semi-molded product. The mounting hole is prevented from being completely removed from the annular groove of the mold, thereby preventing deformation of the mounting hole in the radial direction that occurs during foaming.

  In the method for producing a foamed resin molded product according to the present invention, fine irregularities are formed on the opposed mold surface of the movable mold and the outer peripheral surface of the protrusion, and the fine irregularities are formed on the surface of the semi-molded product. Is transferred to the inner wall surface of the mounting hole, and transfer fine irregularities are formed on the surface of the semi-molded product and the inner wall surface of the mounting hole. The transfer fine unevenness of the inner wall surface of the mounting hole meshes with each other, so that the unfoamed semi-molded product follows the movable mold when the movable mold is retracted by a predetermined stroke length. The transfer fine irregularities on the surface of the semi-molded product and the fine irregularities on the movable mold-facing mold surface are meshed with each other, so that the radial shape deformation of the mounting hole that occurs when the semi-molded product is foamed. To be prevented Good.

  The foamed resin molded article joining structure according to the present invention is a structure in which a foamed resin molded article having an attachment hole is attached and joined to a resin molded article manufactured separately, and is attached to the outer periphery of the attachment hole. Is provided with a rib, and the rib is formed on the molding surface side of the foamed resin molded product molded by the fixed die among the fixed mold and the movable mold used for molding the foamed resin molded product. The joining is performed by inserting a boss standing on the back surface of the resin molded product into the mounting hole of the foamed resin molded product and then fastening the boss near the rib. It is characterized by.

  In the joint structure of the foamed resin molded product according to the present invention, fine irregularities are provided on the molding surface molded by the movable mold and the inner wall surface of the mounting hole among the front and back surfaces of the foamed resin molded product. You may employ | adopt the structure which is.

  In the method for manufacturing a foamed resin molded product according to the present invention, the tip of the rib formed at the stage of the semi-molded product is from the predetermined stroke length retreat operation of the movable mold to the completion of foaming of the semi-molded product. Foaming resin molding with mounting holes with good accuracy in dimensions, shape and forming position because it prevents the shape of the mounting holes from deforming in the radial direction, which occurs when foaming a semi-molded product, by not completely coming out of the annular groove of the fixed mold Goods can be obtained.

  In the manufacturing method of the foamed resin molded product according to the present invention described above, a configuration in which an annular groove for forming a rib is provided on the fixed mold side is adopted. On the other hand, in the joint structure of the foamed resin molded product according to the present invention, as a specific configuration of the rib provided on the outer peripheral edge of the mounting hole of such a foamed resin molded product, the rib is formed of the foamed resin molded product. Among the fixed mold and the movable mold used in the above, a configuration formed on the molding surface side of the foamed resin molded product molded by the fixed mold is employed. For this reason, the manufacturing method of the foamed resin molded product which concerns on this invention demonstrated previously as a manufacturing method of the foamed resin molded product provided with the said rib is employable. And, in the manufacturing process, since the shape of the mounting hole is prevented from being deformed in the radial direction from the predetermined stroke length retreat operation of the movable mold to the completion of foaming of the semi-molded product, the foaming produced is prevented. The accuracy of the dimension, shape and forming position of the mounting hole of the resin molded product is good. Therefore, according to the joining structure of the foamed resin molded product according to the present invention, as a means for joining the foamed resin molded product and the resin molded product manufactured separately from this, the boss is erected on the back surface of the resin molded product. When the boss fastening operation is performed near the rib after inserting into the mounting hole of the foamed resin molded product, the fastening position between the foamed resin molded product and the resin molded product is stable, and the foamed resin molded product and the resin molded product are stable. The effect that the assembling accuracy is improved is obtained.

  In addition, according to the joint structure of the foamed resin molded product according to the present invention, for example, if the crimping process by heat melting is performed on the tip of the boss as the fastening operation of the boss, the rib can also be melted together. Since the volume of the heat melting part becomes large, the effect of being able to firmly fix the foamed resin molded product and the resin molded product is also obtained.

FIG. 1A is a cross-sectional view of a joint structure of a foamed resin molded product according to the present invention (a state before a boss fastening operation is performed), and FIGS. 1B and 1C are FIG. 1A and FIG. It is sectional drawing after performing the fastening operation of the boss | hub in the joining structure of. FIG. 2 is a schematic configuration diagram of a mold used in the method for producing a foamed resin molded product according to the present invention. FIG. 3 is a process schematic diagram of a method for producing a foamed resin molded product according to the present invention. In particular, FIG. 3 (a) shows a filling process (a non-foamed semi-molded product by injection filling a foamed resin material into a cavity) (B) shows a foaming step (state in which a non-foamed semi-molded product is foamed in a foaming space secured by operating the movable mold by retreating a predetermined stroke length), FIG. (C). Indicates the state after completion of foaming. FIG. 4 is a front view of a luggage side trim that is an interior part for a vehicle. FIG. 5 (a) is a cross-sectional view of a conventional mold (movable mold and fixed mold) used when a foamed resin molded product having an attachment hole is manufactured, and FIG. A sectional view of an unfoamed semi-molded product molded using the conventional mold of a), and FIG. 10C shows a foamed resin molded product molded using the conventional mold (FIG. It is sectional drawing of what the non-foamed semi-molded product of the same figure (b) foamed in the foaming space ensured by operating the movable metal mold | die of a) back by predetermined stroke length. 6 (a) and 6 (b), a foamed resin molded product (having mounting holes) manufactured with the conventional mold shown in FIG. 5 (a) is attached and joined to a resin molded product manufactured separately. It is explanatory drawing of the joining position shift at the time.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1A is a cross-sectional view of a joint structure of a foamed resin molded product according to the present invention (a state before a boss fastening operation), and FIGS. 1B and 1C are respectively the same as FIG. It is sectional drawing after performing the fastening operation of the boss | hub in the joining structure of.

  1A is a structure in which a foamed resin molded product 1 having an attachment hole 4 is attached and joined to a resin molded product 2 manufactured separately, and is attached to the outer peripheral edge of the attachment hole 4. Are provided with ribs 3. The rib 3 is a molding surface of the foamed resin molded product 1 molded by the fixed mold D1 among the later-described fixed mold D1 and movable mold D2 (see FIG. 2) used for molding the foamed resin molded product 1. It is provided on the 1A side.

  Then, for joining the foamed resin molded product 1 and the resin molded product 2, the boss 5 erected on the back surface of the resin molded product 2 as shown in FIG. After the insertion, the boss 5 is fastened near the rib 3 on the outer peripheral edge of the mounting hole 4 as shown in FIG. 1B or 1C.

  FIG. 1B shows an example in which the entire boss 5 is formed of a heat-meltable resin and only the tip of the boss 5 is subjected to crimping by heat melting. FIG. 1C similarly shows an example in which the entire boss 5 is formed of a heat-meltable resin and the tip of the boss 5 and the tip of the rib 3 are subjected to crimping by heat melting. However, the present invention is not limited to these examples. As another example of the fastening operation of the boss 5, for example, a method of forming a screw groove on the outer peripheral surface of the tip of the boss 5 and fitting a nut into the screw groove may be adopted.

  In the example of FIG. 1 (c), the volume of the heat-melting part by caulking is increased by heat-melting the tips of the ribs 3 together, so that the foamed resin molded product is larger than the example of FIG. 1 (b). 1 and the resin molded product 2 can be firmly fixed.

  In the foamed resin molded product 1, the portion other than the rib 3 has a two-layer structure of a foam layer 11 and an unfoamed skin layer 12, and the skin layer 12 covers the entire foam layer 11. The foamed layer 11 is obtained by foaming a foamed resin material during the manufacturing process of the foamed resin molded product 1. The skin layer 12 is obtained by cooling the foamable resin material in contact with the molds (fixed mold D1 and movable mold D2) in the manufacturing process of the foamed resin molded product 1 and curing it before foaming. The ribs 3 of the foamed resin molded product 1 are in a form molded entirely from an unfoamed foamed resin material.

  Although not shown in FIGS. 1A to 1C, a molding surface 1 </ b> A formed by a fixed mold D <b> 1 described later, and an inner wall surface of the mounting hole 4, of the front and back surfaces of the foamed resin molded product 1. Are provided with fine irregularities (corresponding to the transfer fine irregularities 53B and 54B in FIG. 3A).

  FIG. 2 is a schematic configuration diagram of a mold used in the method for manufacturing a foamed resin molded product according to the present invention, and FIG. 3 is a process schematic diagram of the method for manufacturing the foamed resin molded product according to the present invention. The foamed resin molded product 1 in FIG. 1A described above is manufactured using the molds (fixed mold D1 and movable mold D2) in FIG. 2 and the manufacturing method in FIG.

<< Description of Mold Configuration of Fig. 2 >>
The mold D shown in FIG. 2 is mainly composed of a fixed mold D1, a movable mold D2, and an injection machine (not shown).

  The fixed mold D1 is configured such that the foamed resin material is supplied to the mold surface through a hot runner and a valve gate which are resin passages of the foamed resin material supplied from the injection machine. The fixed mold D1 includes an ejector pin (not shown) for projecting the finished foamed resin molded product 1 (see FIG. 1A).

  The movable mold D2 has three positions: a mold opening position as shown in FIG. 2, a mold clamping position as shown in FIG. 3B, and a foam molding position as shown in FIG. It is driven to take.

  The movable mold D2 has a mounting hole 4 for the foamed resin molded product 1 (see FIG. 1 (a)) on a mold surface facing the fixed mold D1 (mold surface facing the fixed mold D1). A cylindrical protrusion 50 for forming the.

  On the other hand, the fixed mold D1 includes a recess 51 for accommodating the tip of the protrusion 50 on the mold surface facing the movable mold D2 (the mold surface facing the movable mold D2), and the foaming. An annular groove 52 for forming the rib 3 (see FIG. 1A) is provided on the outer peripheral edge of the mounting hole 4 of the resin molded product 1. The annular groove 52 has a shape surrounding the recess 51. The concave portion 51 can be omitted.

  Further, fine irregularities 53A and 54A are formed on the opposing mold surface of the fixed mold D1 and the outer peripheral surface of the protrusion 50, respectively, by embossing.

<< Description of Method for Manufacturing Foamed Resin Molded Product Using Mold in FIG. 2 >>
The method for producing a foamed resin molded product using the mold shown in FIG. 2 is roughly divided into a filling step shown in FIG. 3A and a foaming step shown in FIG.

  In the filling step of FIG. 3 (a), as shown in FIG. 3 (a), the state where the tip of the protrusion 50 of the movable mold D2 is in contact with the mold surface of the fixed mold D1, specifically, The movable mold D2 and the fixed mold D1 are clamped in a state where the tip of the protrusion 50 of the movable mold D2 is accommodated in the concave portion 51 (see FIG. 2) of the fixed mold D1, and both the molds D1, D2 are respectively clamped. The foamed resin material is injection-filled M into the cavity C defined by the opposed mold surface, thereby forming an unfoamed half-molded product 10 having the mounting holes 4 and the ribs 3 on the outer peripheral edge thereof.

  At this time, the front and back surfaces of the semi-molded product 10 become an unfoamed skin layer 12 by being cooled and cured by contact with the fixed mold D1 and the movable mold D2. The non-foamed skin layer 12 is similarly formed near the surface of the rib 3. The inside of the skin layer 12 is an unfoamed foamed resin material M (injected and filled into the cavity C).

  The concave portion 51 can be omitted as described above. In this case, the fixed mold D1 and the movable mold D2 are clamped by clamping the tip of the protrusion 50 of the movable mold D2 to the fixed mold D1. It is performed in a state where it is in contact with the mold surface. The mold clamping is performed by moving the movable mold D2 from the position shown in FIG. 2 to the mold clamping position shown in FIG. 3A by a press ram (not shown). Injection filling of the foamed resin material into the cavity C is performed through a hot runner and a valve gate (not shown).

  3A, fine irregularities 53A and 54A (see FIG. 2) formed on the opposing mold surface of the fixed mold D1 and the outer peripheral surface of the protrusion 50 are formed on the semi-molded product 10. By being transferred to the surface and the inner wall surface of the mounting hole 4, transfer fine irregularities 53 B and 54 B as shown in FIG. 3A are formed on the surface of the semi-molded product 10 and the inner wall surface of the mounting hole 4. Is done.

  In the foaming process of FIG. 3B, a foaming space is formed between the movable mold D2 and the fixed mold D1 by moving the movable mold D2 backward by a predetermined stroke length L as shown in FIG. 3B. And the foamed resin molded product 1 provided with the attachment hole 4 and the rib 3 of the outer periphery is obtained by foaming the unfoamed semi-molded product 10 in the formed foaming space.

  By the way, even in the foaming step of FIG. 3B, during the foaming of the semi-molded product 10, the foamed resin material in which the force in the direction away from the protrusion 50 (see FIG. 5C) is foaming around the protrusion 50 By acting on, the radial shape deformation of the mounting hole 4 tends to occur.

  However, in the foaming step of FIG. 5B, the tip of the rib 3 formed at the stage of the semi-molded product 10 from the retracting operation of the predetermined stroke length L of the movable mold D2 to the completion of foaming of the semi-molded product 10. Since the portion does not completely come out of the annular groove 52 of the fixed mold D1, the rib 3 functions as a shape deformation suppression stopper, so that the radial shape deformation of the mounting hole 4 that occurs during foaming is prevented.

  Further, when the movable mold D2 is retracted by a predetermined stroke length L and when the unfoamed half-molded product 10 is foamed, the fine irregularities 54A (see FIG. 2) on the outer peripheral surface of the protrusion 50 and the transfer fineness of the inner wall surface of the mounting hole 4 Concavities and convexities (see FIG. 3A) mesh with each other. As a result, the unfoamed semi-molded product 10 comes into close contact with the movable mold D2 as shown in FIG. 3B and follows the retreat of the movable mold D2, so that the shape of the edge of the mounting hole 4 is This stabilizes the so-called shape sag at the edge of the mounting hole 4.

  In order to improve the adhesion of the semi-molded product 10 to the movable mold D2 as described above, the mutual meshing portion (the fine unevenness 54A on the outer peripheral surface of the protrusion 50 and the transfer fine unevenness on the inner wall surface of the mounting hole 4 are formed. It is preferable to set the portion engaged with each other to 1/3 or more of the depth N of the mounting hole 4 shown in FIG.

  Further, when the movable mold D2 is retracted by a predetermined stroke length L and when the unfoamed half-molded product 10 is foamed, the fine irregularities 53A (see FIG. 2) of the movable mold D1 facing mold surface and the surface of the half-molded product 10 are The transfer fine irregularities 53B (see FIG. 3A) mesh with each other. Since such a meshing portion also functions as a stopper for suppressing shape deformation as in the case of the rib 3 described above, the radial shape deformation of the mounting hole 4 that occurs when the semi-molded product 10 is foamed is even more effective. Is prevented.

  The skin layer 12 on the surface of the semi-molded product 10 in FIG. 3A grows in the foaming step in FIG. 3B, and becomes slightly thick as shown in FIG. Further, the skin layer 12 of the rib 3 of the semi-molded product 10 in FIG. 3A also grows in the foaming process in FIG. 3B, and when the molding is completed, the skin layer on the surface thereof as shown in FIG. Since 12 grows over the entire rib 3, the entire rib 3 is formed of an unfoamed foamed resin material.

  As described above, according to the method for manufacturing a foamed resin molded product of the present embodiment, during the period from the predetermined stroke length L retracting operation of the movable mold D2 to the completion of foaming of the semimolded product 10, at the stage of the semimolded product 10. Since the tip end portion of the formed rib 3 does not completely come out of the annular groove 52 of the fixed mold D1, the radial shape deformation of the mounting hole 4 that occurs when the semi-molded product 10 is foamed is prevented. Thus, it is possible to obtain the foamed resin molded product 1 provided with the mounting holes 4 with high accuracy in the formation position.

  Moreover, since the foamed resin molded product 1 of FIG. 1 obtained by the above manufacturing method has the accuracy of the dimension of the attachment hole 4, a shape, and a formation position, it is the joining structure as shown in FIG. According to the structure in which the foamed resin molded product 1 provided with the mounting holes 4 is attached to and joined to a resin molded product 2 manufactured separately from this, the boss 5 erected on the back surface of the resin molded product 2 is provided with the foamed resin. After inserting into the mounting hole 4 of the molded product 1, when the fastening operation of the boss 5 is performed near the rib 3, the fastening position of the foamed resin molded product 1 and the resin molded product 2 becomes stable, and the foamed resin molded product 1. And the assembly accuracy of the resin molded product 2 is improved.

  The foamed resin molded product manufacturing method and the foamed resin molded product joining structure described above are, for example, a method of manufacturing the luggage side trim trim upper T1 shown in FIG. 4 and a structure of joining the trim upper T1 to the trim lower T2. However, it is not limited to these.

  The present invention is not limited to the embodiments described above, and many modifications can be made by those having ordinary knowledge in the art within the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Foamed resin molded product 10 Unfoamed semi-molded product 1A Molded surface of foamed resin molded product molded by fixed mold 2 Resin molded product 3 Rib 4 Mounting hole 5 Boss 50 Projection 51 Recess 52 Annular groove 53A, 54A Fine Concavities and convexities 53B, 54B Transfer fine concavities and convexities D1 Fixed mold D2 Movable mold T1 Trim upper T2 Trim lower

Claims (4)

A method for producing a foamed resin molded article (1) having a mounting hole (4) using a movable mold (D2) and a fixed mold (D1) opposite to the movable mold (D2),
The movable mold (D2) has a protrusion (50) for forming the attachment hole (4) on the mold surface facing the fixed mold (D1).
The stationary mold (D1) has an annular groove (52) for forming a rib (3) on the outer peripheral edge of the mounting hole (4) on the mold surface facing the movable mold (D2). ,
The movable mold (D2) and the fixed mold (D1) are placed in a state where the tip of the protrusion (50) of the movable mold (D2) is in contact with the mold surface of the fixed mold (D1). The mounting hole (4) and the rib (3) on the outer periphery thereof are clamped and injected and filled with a foamed resin material into the cavity (C) defined by the opposing mold surfaces of both molds. After molding an unfoamed semi-molded product (10) with
A foaming space is formed between the movable mold (D2) and the fixed mold (D1) by reversing the movable mold (D2) by a predetermined stroke length (L), and the formed foam By foaming the unfoamed semi-molded product (10) in a space, a foamed resin molded product (1) provided with the mounting hole (4) and the outer peripheral rib (3) is molded. ,
Between the retraction operation of the movable mold (D2) and the completion of foaming of the semi-molded product (10), the tip of the rib (3) formed at the stage of the semi-molded product (10) is the fixed mold. A method for producing a foamed resin molded product, wherein the mounting hole (4) is prevented from being deformed in the radial direction by foaming by not completely coming out of the annular groove (52) of the mold (D1). Fine irregularities (53A, 54A) are formed on the opposing mold surface of the movable mold (D2) and the outer peripheral surface of the protrusion (50), and the fine irregularities (53A, 54A) are the semi-molded product. By transferring to the surface of (10) and the inner wall surface of the mounting hole (4), the surface of the semi-molded product (10) and the inner wall surface of the mounting hole (4) are transferred fine irregularities ( 53B, 54B) are formed,
A predetermined stroke of the movable mold (D2) is obtained when the fine unevenness (54A) on the outer peripheral surface of the protrusion (50) and the transfer fine unevenness (54B) on the inner wall surface of the mounting hole (4) mesh with each other. The unfoamed semi-molded product (10) follows the movable mold (D2) during the long (L) retreat, and the transfer fine irregularities (53B) on the surface of the semi-molded product (10). ) And the fine unevenness (53A) of the movable mold (D1) facing mold surface are engaged with each other, so that the radial shape of the mounting hole (4) generated when the semi-molded product (10) is foamed 2. The method for producing a foamed resin molded article according to claim 1, wherein deformation is prevented. A structure in which a foamed resin molded product (1) having a mounting hole (4) is attached to and joined to a resin molded product (2) manufactured separately,
A rib (3) is provided on the outer peripheral edge of the mounting hole (4),
The said rib (3) is the said foaming resin molding shape | molded by the fixed metal mold | die (D1) among the stationary metal mold | die (D1) and movable mold | die (D2) used for shaping | molding of the said foaming resin molded product (1). Formed on the molding surface (1A) side of the product (1),
For the joining, after inserting the boss (5) standing on the back surface of the resin molded product (2) into the mounting hole (4) of the foamed resin molded product (1), the vicinity of the rib (3) The joint structure of the foamed resin molded product, wherein the fastening operation of the boss (5) is performed. Among the front and back surfaces of the foamed resin molded product (1), fine irregularities are provided on the molding surface molded by the movable mold (D2) and the inner wall surface of the mounting hole (4). The joint structure of the foamed resin molded product according to claim 3.

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