JPH0715314U - Insert mold - Google Patents

Abstract

(57) [Summary] [Purpose] Accurately position and hold inserts,
After molding, the product can be removed from the mold without any problem. [Structure] On a molding surface of a molding die or an extended surface thereof having a tilt angle with respect to a mold opening direction, a magnet 5 for adsorbing and holding an insert 4 and a front end surface parallel to the mold opening direction are provided. A positioning pin 6 for the insert, which projects into the mold and has the other end located in the mold, is provided. After the resin is injected into the mold 3 to integrally mold the insert 4, the positioning pin 6 can be removed from the mold without interference when the mold is opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mold for setting an insert in a mold for molding FRP products and the like.

[0002]

[Prior art]

 FRP (glass fiber reinforced resin) products have come to be used for various molded products such as outer panels of automobiles. For example, when the engine hood is made of FRP, in order to secure the rigidity, strength, etc. of the molded product, a plurality of reinforcing fibers such as glass fibers are stacked and molded in a mat shape in advance, and this glass fiber is used. Resin transfer molding (hereinafter referred to as RTM) is used in which a mat is set in a mold and molten resin is poured into the mold to mold it. When molding an FRP engine hood, it is necessary to install embedded bolts for fixing the hinges for attachment to the body.

Various methods have been proposed for simultaneously embedding an insert during molding of FRP or the like. In Japanese Unexamined Patent Publication No. 57-125017, a pedestal made of rubber or soft plastic is embedded in the molding surface of a mold, and a female screw of a nut to be inserted into a protrusion formed on the pedestal is pushed to insert the nut into the cavity. It describes a method for manufacturing a molded product in which a protrusion of a pedestal is pulled out from an internal thread portion of a nut inserted into the product when supporting and releasing the product after molding. Further, in Japanese Unexamined Patent Publication No. 2-55108, a concave portion is formed on the cavity surface of the upper mold so as to correspond to a position where the insert component is embedded, and a hole communicating with this concave portion is connected to an air suction device outside the device. A synthetic resin molding device provided with a sleeve has been proposed. This device is shown in FIG. A concave portion opening to the cavity 12 and a stepped hole communicating with the concave portion are provided at a desired portion of the upper mold 11, and the threaded portion of the bolt 13 with the embedded flange 14 is covered with the sleeve 15 and inserted into the hole. Air is taken in by a pipe 16 connected to an air intake device outside the device, the flange 14 is brought into contact with the stepped portion of the recess, and the bolt 13 is set. When the cavity 12 is filled with resin, the flange 14 of the bolt is embedded in the resin. After the resin is cured, the mold is opened and air is sent from the pipe 16 to demold the product.

The inserts described in the above publications are all positioned by the molding surface of the mold, but in JP-A-1-157812, the insert is floated and supported in the cavity of the mold. The molding method for doing so is described. This molding method will be described with reference to FIG. A cavity 23 is formed by the molds 21 and 22, a mounting hole 24 is provided in the upper mold 21, and a central hole of a cap 25 made of an elastic material such as rubber is pushed into a screw portion of an inserting bolt 26 to mount the cap 23. 25 is pushed into the mounting hole 24, and as shown in the figure, the head of the insert bolt 26 is supported in a state of being suspended in the air by a distance of h from the molding surface of the upper mold 21. When the cavity 23 is filled with resin, the periphery of the head of the insert bolt 26 is uniformly coated with resin. When the molded product is released from the mold, the cap 25 is pulled out together with the upper mold 21 from the threaded portion of the insert bolt 26.

In Japanese Utility Model Laid-Open No. 3-109813, there is disclosed a molding die in which a clip base having an opening is inserted into a molding die, and a molding die is formed with a protrusion for covering the opening of the clip base. Have been described. Further, Japanese Utility Model Laid-Open Publication No. 2-41916 describes a positioning mechanism of an insert object in which a guide pin is biased by an elastic member so that a tip end thereof is in a protruding state.

[0006]

[Problems to be solved by the device]

 All of the above conventional insert molds set the insert in a direction perpendicular to the molding surface, and the positioning mechanism of the insert may interfere when the mold is opened and the molded product is taken out after molding. Without, the product can be demolded. However, if the insert is set along the molding surface and has an inclination angle with the mold opening direction, the positioning mechanism of the insert interferes and the product cannot be demolded.

In such a case, generally, a method called outsert, which can be attached by screwing or press-fitting after FRP molding, is generally used. However, in the case of FRP mainly composed of thermosetting resin, this outsert method is limited in torsional torque and pullout resistance of the inserted bolt, and it is difficult to secure positioning accuracy. In addition, since it is post-processed after molding, extra man-hours are required.

An object of the present invention is to solve the above-mentioned problems and to provide an insert molding die capable of accurately positioning and holding an insert material and capable of releasing a product after molding without trouble. It is what

[0009]

[Means for Solving the Problems]

 According to the present invention, a magnet for adsorbing and holding an insert is provided on a molding surface of a molding die or an extended surface thereof having an inclination angle with respect to the die opening direction, and a front end surface is parallel to the die opening direction and one end edge thereof is It is an insert molding die that has a positioning pin that projects into the mold and the other end edge is located inside the mold, and the tip of the insert projects into the mold when the spring is biased. The positioning member may be configured as described above.

[0010]

[Action]

 The insert is accurately positioned on the predetermined surface of the mold by the positioning member and held by the magnet.After the resin is injected into the mold to integrally mold the insert, the positioning member interferes when the mold is opened. You can demold without doing.

[0011]

Embodiment 1 FIG. 1 shows a first embodiment of the present invention. FIG. 1A is a partial cross-sectional view of a state where an insert is set in a molding die and resin is injected, and FIG. 1B is a schematic view of FIG. 1A. It is an enlarged view of a part. FIG. 1 shows a case where a bracket metal fitting 4 is used as an insert and is inserted into an end portion of a molded product to be integrally molded. The positioning pin 6 and the magnet 5 are arranged on an extension of the molding surface of the lower mold 1 and having a tilt angle with the mold opening direction (vertical direction in the drawing) of the upper mold 2. As shown in FIG. 1B, the positioning pin 6 is installed at a portion of the bracket 4 facing the bolt hole 4a, and its tip portion is formed by cutting it vertically, and its upper edge 6a is formed from the lower mold 1. Although it is projected, the lower edge 6b is positioned in the lower mold 1 with a slight gap t formed between the lower mold 1 and the molding surface of the lower mold 1.

Next, the molding method will be described. As shown in FIG. 1, the bolt holes 4a of the bracket 4 are inserted into the positioning pins 6 of the opened lower mold 1, and the magnets 5 attract and hold the holes. At this time, the bracket 4 is positioned in the cavity 3 so that the embedded portion 4b of the bracket 4 is located at the center of the product thickness. A desired number of glass fiber mats are set in the cavity 3, the upper mold 2 is closed, and molten resin is injected into the cavity 3 and cured. The bracket metal fitting 4 is accurately positioned on the lower mold 1 by the positioning pin 6 and held by the upper mold 2, so that the bracket metal fitting 4 will not be displaced even if pressure of molten resin is applied during molding.

After the resin is cured, the mold is opened and the product is demolded. Since the tip of the positioning pin 6 is cut in the vertical direction, the bracket metal fitting 4 does not interfere with the positioning pin 6 when the upper die 2 is lifted in the vertical direction. The integrated bracket bracket 4 can be removed from the lower mold 1.

FIG. 2 shows a second embodiment. In this embodiment, a mounting member and the like are inserted into the inside of a resin molded body, and a positioning ball 8 with a spring 9 and a magnet 5 are arranged at the mounting position of the insert member 7 on the molding surface of the lower mold 1. Is. The positioning ball 8 is held by the spring 9 in a state of protruding from the molding surface of the lower mold 1, and is engaged with the bolt hole of the insert metal fitting 7 to position the insert metal fitting 7 at a predetermined part of the lower metal mold 1 and to move the magnet 5 Hold in that state. The RTM molding by this molding die is similar to that described in the first embodiment, but the positioning ball 8 compresses the spring 9 and escapes at the time of demolding to prevent interference. Since the positioning member in this embodiment escapes by the spring at the time of demolding, the member that engages with the insert is not limited to the ball, but may be a conical pin or the like.

[0015]

[Effect of device]

 Even when the insert is set along the molding surface and has an inclination angle with the mold opening direction, the invention does not interfere with the positioning mechanism of the insert when the mold is opened and the molded product is taken out. As a result, the product can be demolded, and product quality and productivity can be significantly improved compared to the conventional manual work.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a first embodiment of the present invention and an enlarged view of a main part.

FIG. 2 is a partial sectional view of a second embodiment of the present invention.

FIG. 3 is an explanatory view of a conventional insert method.

FIG. 4 is an explanatory view of another conventional insertion method.

[Explanation of symbols]

1 Lower mold 2 Upper mold 3 Cavity 4 Bracket metal fitting 5 Magnet 6 Positioning pin 7 Insert metal fitting 8 Positioning ball 9 Spring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B29K 105: 22

Claims (2)

[Scope of utility model registration request] 1. A magnet for adsorbing and holding an insert and a tip end surface parallel to the mold opening direction and one end edge of which is formed on a molding surface of the molding die or an extension surface of the molding die and having a tilt angle with respect to the die opening direction. An insert molding die characterized by being provided with a positioning pin for an insert that projects into the mold and has the other end located inside the mold. 2. A magnet for adsorbing and holding an insert and a tip end of the molding surface of a molding die or an extended surface thereof which has an inclination angle with respect to the die opening direction and protrudes into the die by the biasing of a spring. An insert molding die, which is provided with a positioning member for the insert.