JP2008120005A - Molding method of resin foamed object and mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the efficiency of molding for sucking and holding an integrated molding member to the inner surface of a mold. <P>SOLUTION: A suction part 11 comprises the recessed holes 12 depressed from the inner surface of an upper mold 10, the lid members 13 mounted on the inlet parts of the recessed holes 12, the suction small holes 14 provided between the peripheral edge parts of the lid members 13 and the inner peripheral surfaces of the inlet parts and the exhaust ports 15 facing the deep surfaces of the recessed holes 12. The exhaust ports 15 are arranged apart from the extension lines in the hole axis directions of the suction small holes 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and a mold for molding a resin foam such as an EA material made of a rigid polyurethane foam for energy absorption (EA), which is attached to a door trim or the like of an automobile. The present invention relates to a molding method and a molding die of a resin foam in which a member is integrated with a foamed resin.

  Foam moldings such as EA materials made of rigid polyurethane foam for energy absorption (EA) during side impacts (side impacts), which are attached to automobile door trims, foam urethane stock solution in the mold. To be molded. This mold includes an upper mold and a lower mold (for example, Patent Document 1 below).

  The EA material is integrally provided with a member (an integral molding member) such as a member for attachment to a vehicle.

In molding the EA material, the integral molding member may be sucked and held on the inner surface of the molding die.
Japanese Patent Publication No. 61-37101

  In the molding method and the molding die of the resin foam in which the integral molding member is sucked and held on the inner surface of the molding die, the release agent applied to the inner surface of the molding die is sucked into the suction portion for sucking and holding, The suction part may become clogged.

  The present invention relates to a resin foam molding method and a molding die in which an integral molding member is sucked and held on the inner surface of a molding die, and a suction portion for sucking and holding is clogged by a release agent applied to the inner surface of the molding die. The purpose is to prevent.

  The resin foam molding die according to claim 1 has a mold release agent attached to the inner surface of the molding die, and then sucks and holds an integral molding member on the inner surface of the molding die by a suction part. In a molding die used in a molding method of a resin foam in which a member is integrated with a foamed resin at the time of foam molding of a resin raw material in the molding die, a plurality of suction portions connected to the outside of the molding die are used for the integration. The molding member is held on the inner surface of the mold.

  The resin foam molding die according to claim 2 is the resin foam molding die according to claim 1, wherein each suction portion includes a vacant space facing the inner surface of the molding die, a small hole communicating the vacant chamber and the molding die, and the vacant chamber. And an exhaust port for exhausting from the exhaust hole, and the exhaust port is disposed away from an extension line in the hole axial direction of the small hole.

  The mold of the resin foam according to claim 3 is the mold according to claim 2, wherein the vacancy comprises a concave hole recessed from an inner surface of the mold, and a lid provided at an inlet portion of the concave hole, The exhaust port is provided in the inner surface of the concave hole, and the small hole is provided between the lid body or the lid body and the inlet portion.

  According to a fourth aspect of the present invention, there is provided the resin foam molding die according to the third aspect, wherein the exhaust port is disposed on one end side of the inner surface of the concave hole, and the small hole is disposed on the other end side of the inlet portion. It is characterized by that.

  According to a fifth aspect of the present invention, there is provided a resin foam molding die according to the first aspect, wherein the suction portion has a plurality of small holes facing the inner surface of the molding die.

  According to a sixth aspect of the present invention, there is provided the resin foam molding die according to the first aspect, wherein the suction portion is provided with a valve device that closes when a release agent enters the suction portion. It is a feature.

  According to a seventh aspect of the present invention, there is provided a resin foam molding die in which a mold release agent is attached to the inner surface of the molding die, and an integral molding member is sucked and held on the inner surface of the molding die by a suction portion. In a molding die used in a molding method of a resin foam in which a member is integrated with a foamed resin at the time of foam molding of a resin raw material in the molding die, a release agent enters the suction portion into the suction portion. A valve device that closes when it comes is provided.

  The method for molding a resin foam according to an eighth aspect uses the molding die according to any one of the first to seventh aspects.

  In the molding die according to claim 1, since a plurality of suction portions are provided, even if the mold release agent enters some suction portions, the integral molding member is sucked and held by the remaining suction portions. As a result, the integral molding member does not fall off from the inner surface of the mold immediately.

  According to the mold of claims 2 to 4, since the exhaust port is arranged away from the extension line in the hole axial direction of the small hole, even if the mold release agent passes through the small hole, it goes straight to the exhaust port. And does not enter the exhaust port. Even if the release agent enters the vacant space, the exhaust port will not be clogged as long as the amount is small.

  As described in claim 4, by arranging the small hole and the exhaust port on the opposite side, this effect becomes remarkable.

  In the mold according to claim 5, the diameter of the small holes is reduced and the number of the small holes is increased, so that it is possible to suppress the intrusion of the release agent into the vacant space while ensuring the suction force. .

  According to the molds of claims 6 and 7, the valve device prevents the release agent from entering the suction part.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 (a) is a sectional view showing an upper mold of a molding die according to the embodiment, and FIG. 1 (b) is an enlarged view of the suction part.

  The molding die (mold) having the upper die 10 is for molding an automotive EA material made of a rigid polyurethane foam, and a slab urethane foam (hereinafter referred to as an integral molding member) is formed on the inner surface of the upper die 10. , Abbreviated as slab) 9 is held. The slab 9 is held by a plurality of suction portions 11 provided on the upper mold 10.

  The suction portion 11 includes a concave hole 12 that is recessed from the inner surface of the upper mold 10, a lid body 13 that is attached to the inlet portion of the concave hole 12, a peripheral edge portion of the lid body 13, and an inner peripheral surface of the inlet portion. And a small suction hole 14 provided between the exhaust hole 15 and the exhaust port 15 facing the inner surface of the concave hole 12. A negative pressure source such as a vacuum pump is connected to the exhaust port 15 via a pressure resistant hose 16.

  By attaching the lid 13 to the entrance of the recessed hole 12, the interior of the recessed hole 12 is an empty room.

  In addition, although illustration is abbreviate | omitted, in this Embodiment, the adhesive bond layer is provided in the back surface of the slab 9, ie, the surface which overlaps with the upper mold | type 10, and this adhesive bond layer is covered with the release paper. One end of the release paper protrudes from the slab 9 in the shape of an ear. The upper mold 10 is provided with a groove-like portion 17 that accommodates the ear-like protruding piece portion of the release paper.

  A shallow portion 18 for receiving the slab 9 is provided on the inner surface of the upper mold 10.

  The exhaust port 15 is separated from the extension line of the small hole 14 in the hole axial direction. The hole axis direction is a straight line that stands perpendicular to the inner surface of the upper mold 10.

  In this embodiment, the exhaust port 15 is located on one end side of the inner surface of the recessed hole 12. The small hole 14 is located on the other end side of the inlet portion of the recessed hole 12.

  In this embodiment, the recessed hole 12 has a cylindrical shape, and the exhaust port 15 and the small hole 14 are located on opposite sides of the cylindrical axis. The shape of the recessed hole 12 is not limited to a cylindrical shape, and may be an elliptical column shape, a prismatic shape, or the like. The hole 14 is disposed on the opposite side.

  When the EA material is molded using the mold having the upper mold 10 configured as described above, a slab 9 is applied to the upper mold 10 by the suction force of the suction portion 11 after applying a release agent to the inner surface of the mold. While being held, a urethane stock solution is supplied into the lower mold of the mold, and the mold is clamped and foamed, and then demolded to obtain a molded product.

  In this embodiment, in each suction part 11, the small hole 14 and the exhaust port 15 are displaced from each other, so that the mold release agent temporarily enters the empty space in the recessed hole 12 from the small hole 14. Even so, the release agent does not immediately go straight through the small hole 12 and enter the exhaust port 15, and clogging of the negative pressure source such as the exhaust port 15, the hose 15, and the vacuum pump is prevented.

  Furthermore, since a plurality of suction portions 11 are provided, even if a release agent enters a part of the suction portions 11 and the suction force is reduced, the slab 9 is thereby immediately dropped, resulting in defective molding. It does not occur.

  For this reason, according to this embodiment, the molded product can be molded relatively efficiently and with a high yield.

  FIG. 2 is a cross-sectional view showing an upper mold according to another embodiment of the present invention, and FIG. 3 is an enlarged view of the suction portion of FIG.

  Also in this embodiment, the upper mold 30 is provided with a plurality of suction portions 31 so that the slab 9 is sucked and held.

  Each suction part 31 is configured to transmit the negative pressure from the hose 16 to the suction port 41 via the valve device 32. The valve device 32 is controlled by the control device 33 so as to transmit a negative pressure to the suction port 41 when the suction part 31 is not clogged, and to stop the negative pressure transmission when the clogging occurs.

  Details of the configuration of the valve device 32 and the control device 33 will be described next with reference to FIG.

  A cylinder 40 constituting the outer shell of the suction part 31 is attached to the upper mold 30, and a suction port 41 at the tip of the cylinder 40 faces the inner surface of the upper mold 30. A valve seat portion 42 is provided around the suction port 41 at the tip of the cylinder 40.

  A valve body 43 is disposed in the cylinder 40 so as to be seated on and separated from the valve seat portion 42. There is a sufficient space between the outer peripheral surface of the valve body 43 and the inner peripheral surface of the cylinder 40 to allow a gas such as air to pass through.

  A piston 45 is connected to the valve body 43 via a rod 44. A spring 46 is disposed on the rear end side of the piston 45 so as to urge the piston 45 and the valve body 43 toward the distal end side.

  An exhaust port 47 for exhausting a gas such as air from between the piston 45 and the valve body 43 is provided in the cylinder 40. The exhaust port 47 is connected to the hose 16 through a negative pressure line 48 and a connector 49.

  An end block 50 is fixed to the rear end of the cylinder 40. The spring 46 is interposed between the end block 50 and the piston 45 in a stored state. The end block 50 is provided with a vent hole 51 and a vent hole 52 arranged coaxially, and a valve body sliding chamber 53 is provided between the vent hole 51 and the vent hole 52. A control valve body 54 is installed in the body sliding chamber 53.

  The valve body sliding chamber 53 extends in a direction orthogonal to the direction connecting the vent hole 51 and the vent hole 52, and the control valve body 54 moves in the valve body sliding chamber 53 in the extending direction. Arranged to be possible.

  The control valve body 54 is provided with a through hole 55 for communicating the vent hole 51 and the vent hole 52. Further, a notch portion 54 a is provided at a corner portion on the front end side of the control valve body 54 for communicating the vent hole 51 and an atmosphere communication opening 64 described later when the control valve body 54 is retracted.

  A cylinder bore 58 is provided in the end block 50 so as to be continuous with the rear side of the valve body sliding chamber 53, and a piston 57 is slidably installed in the cylinder bore 58. The end wall surface 50e of the end block 50 opposite to the cylinder bore 58 is provided with an opening 64 for communicating the inside of the valve body sliding chamber 53 with the atmosphere.

  The piston 57 and the rear end of the control valve body 54 are connected by a rod 56. A spring 59 is disposed on the rear side in the cylinder bore 58 so as to urge the piston 57 and the control valve body 54 in the direction toward the end wall surface 50e.

  The rear side of the cylinder bore 58 is connected to the negative pressure line 48 via a port 60 provided in the end block 50 and a negative pressure line 62.

  The vent 52 is connected to the negative pressure line 48 through a negative pressure line 63.

  In the upper mold 30 having the suction part 31 configured as described above, when the mold release agent does not enter the suction port 41, the negative pressure from the hose 16 is reduced to the negative pressure line 48, the exhaust. The slab 9 is sucked and held in the upper mold 30 by being transmitted to the suction port 41 through the port 47.

  At this time, since a gas such as air sucked from the suction port 41 flows into the negative pressure line 48, the negative pressure in the negative pressure line 48 is not so strong. Therefore, the piston 57 and the control valve body 54 of the control device 33 are pushed by the spring 59, and the control valve body 54 is in contact with the end wall surface 50e of the valve body sliding chamber 53 as shown in FIG.

  In this state, the vent hole 52 and the vent hole 51 communicate with each other through the through hole 55, and the negative pressure of the negative pressure line 48 is transmitted through the vent hole 52, the through hole 55 and the vent hole 51. It is transmitted into the cylinder 40. Then, the piston 45 pushes and contracts the spring 46 and is attracted to the end block 50 side, and the valve body 43 is separated from the valve seat portion 42. As a result, the negative pressure of the negative pressure line 48 is transmitted to the suction port 41 as described above.

  When the release agent has entered the suction port 41, the suction port 41 is clogged with the release agent, and the gas inflow from the suction port 41 is reduced or stopped. Thereby, the negative pressure in the negative pressure line 48 becomes stronger. Then, the piston 57 of the control device 33 is pulled toward the port 60 side while pressing and contracting the spring 58.

  As a result, the through hole 55 does not overlap the vent hole 51 and the vent hole 52, and the negative pressure line 63 and the vent hole 51 are cut off. Instead, the vent hole 51 and the opening 64 are inserted through the notch 54 a of the control valve body 54, and the air flows into the cylinder 40.

  As a result, the piston 50 and the valve body 43 move toward the tip end side of the cylinder 40 by the pressing force of the spring 46, and the valve body 43 is seated on the valve seat portion 42. As a result, the suction port 41 is closed and the release agent is prevented from entering the cylinder 40.

  In this embodiment as well, the slab 9 is sucked and held by the plurality of suction portions 31, and even if some of the suction portions 31 are clogged, the slab 9 may drop off immediately and cause defective molding. Therefore, the molding efficiency and yield of the molded product are improved.

  Each of the above embodiments is an example of the present invention, and the present invention may take other forms.

  For example, in the embodiment shown in FIGS. 2 and 3, the groove 17 similar to that shown in FIG. 1 may be provided.

It is sectional drawing of the upper mold | type of the shaping | molding die which concerns on embodiment. It is sectional drawing of the upper mold | type of the shaping | molding die concerning another embodiment. FIG. 3 is an enlarged view of a part of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Slab as integral molding member 10,30 Upper mold | type 11,31 Suction part 12 Recessed hole 13 Cover body 14 Small hole 15,47 Exhaust port 33 Control apparatus 40 Cylinder 41 Suction port 42 Valve seat part 43 Valve body 45, 57 Piston 48, 62, 63 Negative pressure line 54 Control valve body 55 Through hole

Claims (8)

After the release agent is adhered to the inner surface of the mold, the integral molding member is sucked and held on the inner surface of the mold by the suction portion, and the integral molding member is foamed of the resin raw material in the mold. In the mold used in the molding method of the resin foam that is integrated with the foamed resin at the time of molding,
A molding die for a resin foam, characterized in that a plurality of suction members communicating with the outside of the molding die are used to hold the integral molding member on the inner surface of the molding die. In claim 1, each suction portion includes a space facing the inner surface of the mold, a small hole communicating the chamber and the inside of the mold, and an exhaust port for exhausting from the space,
The mold for resin foam, wherein the exhaust port is spaced apart from an extension line in the axial direction of the small hole. In Claim 2, the vacant chamber comprises a concave hole that is recessed from the inner surface of the mold, and a lid provided at the entrance of the concave hole,
The resin foam molding die, wherein the exhaust port is provided in a back surface of the concave hole, and the small hole is provided between the lid body or the lid body and the inlet portion. The exhaust port according to claim 3, wherein the exhaust port is disposed on one end side of the inner surface of the recessed hole.
The small hole is disposed on the other end side of the inlet portion.   2. The resin foam molding die according to claim 1, wherein the suction portion has a plurality of small holes facing an inner surface of the molding die.   The resin foam molding die according to claim 1, wherein the suction part is provided with a valve device that closes when a release agent enters the suction part. After the release agent is adhered to the inner surface of the mold, the integral molding member is sucked and held on the inner surface of the mold by the suction portion, and the integral molding member is foamed of the resin raw material in the mold. In the mold used in the molding method of the resin foam that is integrated with the foamed resin at the time of molding,
A mold for resin foam, wherein the suction part is provided with a valve device that closes when a release agent enters the suction part.   The molding method of the resin foam using the shaping | molding die of any one of Claim 1 thru | or 7.

Images