JPH0629813U - Insert mounting device for mold - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the setting of inserts, and to position and hold them accurately. [Structure] Insert holes are provided on the molding surface of the mold,
The piston shaft 5 is movable in a predetermined distance in the axial direction of the insertion hole.
And a pair of facing members 7 and 8 which move forward and backward in a direction perpendicular to the axis of the insertion hole in association with the movement of the piston shaft, and which have elasticity for sandwiching the periphery of the insert at the tip of each of the facing members. The member 10 is provided. When the insert is pushed in from the insertion hole of the mold, the piston shaft 5 is pushed by the insert 12 and moves for a predetermined distance, the pair of elastic members 10 move forward and sandwich the periphery of the insert, and the insert is positioned and fixed. . After molding, when the mold is opened and the piston shaft is pushed down, the elastic member retracts to release the sandwiching around the insert, and the insert is extruded by the piston shaft and the product is demolded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mounting device for setting an insert in a mold in a molding mold used for molding an FRP product or the like.

[0002]

[Prior art]

 Recently, FRP (glass fiber reinforced resin) products have come to be used in various molded products such as automobile outer panels. For example, when the engine hood is made of FRP, in order to secure the rigidity, strength, etc. of the molded product, reinforcing fibers such as glass fibers are molded in a mat shape in advance, and a plurality of glass fiber mats are stacked. Resin transfer molding (hereinafter referred to as RTM) is used in which the resin is set in a mold and a molten resin is injected into the mold for molding. The present applicant has previously filed a patent application (Japanese Patent Laid-Open No. 4-224915) regarding a method of setting a glass fiber mat on an upper mold using a magic tape. The outline of this method will be described with reference to FIGS. FIG. 5 is an explanatory view shown in cross section, and FIG. 6 is a rear view of the upper mold seen from the direction X-X in FIG. The lower mold 24 is a cavity mold for molding the outer surface of the engine hood, the upper mold 21 is a core mold for molding the back surface of the product, and a large number of Velcro tapes 25 are attached to the molding portion of the upper mold 21 with an adhesive 27. The reinforcing glass fiber 22 preformed in a mat shape is pressed against the velcro tape 25 attached to the upper die 21, and the hook 26 of the velcro tape 25 is set to the glass fiber by being locked. Next, the velcro tape 25 is adhered to the upper surface of the foam material 23, and is pressed and set on the glass fiber mat 22 attached to the upper mold 21. The glass fiber mat 22 is also placed on the lower mold 24. When the upper and lower molds are clamped and molten resin is injected, the molten resin permeates the inside of the glass fiber mat 22 and simultaneously forms a resin layer around it. After the resin has hardened, the mold is opened and the molded product is demolded.

By the way, in the case of molding an FRP engine hood, it is necessary to install embedded bolts for fixing the attachment hinges to the body. For the installation of the bolts, generally, a method called "outsert", in which the bolts are attached by screwing or press-fitting after FRP molding, is often 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.

Further, various methods have been proposed in which inserts such as bolts and nuts are embedded at the same time when FRP is molded. 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 the protrusion of the pedestal is pulled out from the female screw part of the nut inserted into the product when supporting and releasing the product after molding. Further, in Japanese Unexamined Patent Publication No. 2-55108, a recess is formed in the cavity surface of the upper mold so as to correspond to the position where the insert part is embedded, and the hole communicating with this recess is connected to the suction device outside the device. A synthetic resin molding device provided with a sleeve has been proposed. In Japanese Utility Model Publication No. 2-80310, a slide pin protruding from the mold surface is provided, and a cylindrical shape is provided between the tip flange portion and the mold surface. Molding die that is fitted with the elastic body of, and that can move this slide pin in the axial direction in conjunction with the movement of the mold closing die, and set the insert parts fitted with the cylindrical elastic body. Is listed.

The inserts described in the above publications are all positioned by the molding surface of the mold, but in Japanese Patent Laid-Open Nos. 1-157812 and 1-80310, the inserts are positioned inside the mold cavity. It describes that the insert parts are floated and supported. This molding method will be described with reference to FIG. A cavity 33 is formed by the upper and lower molds 31 and 32, a mounting hole 34 is provided in the upper mold 31, and a central hole of an elastic cap 35 of rubber or the like is pushed into the threaded portion of a bolt 36 to be inserted and mounted. The cap 35 is pushed into the mounting hole 34, and as shown in the figure, the head of the insert bolt 36 is supported in a state of being suspended in the air by a distance of h from the molding surface of the upper mold 31. When the cavity 33 is filled with resin, the area around the head of the insert bolt 36 is filled with resin. When removing the molded product, the cap 35 is pulled out together with the upper mold 31 from the threaded portion of the insert bolt 36.

[0006]

[Problems to be solved by the device]

 In the method using the magic tape shown in FIGS. 5 and 6, it takes a lot of time to attach a large number of magic tapes, the positioning is difficult, and the magic tape remains on the product, so that the appearance is not good. Furthermore, when installing embedded bolts, it is necessary to install them by outsert after FRP molding. In the conventional inserter part setting method shown in FIG. 7, since the insert part is held in the mounting hole of the upper die 31 by the elasticity of the rubber cap 35, the positioning of the insert part becomes unstable, which causes a problem in positioning accuracy. is there. That is, the distance h between the insert bolt 36 and the molding surface shown in FIG. 7 determines the thickness of the resin layer filled between the bolt head and the bolt head, which requires accurate positioning. Positioning is unstable when the cap 35 is held by the elastic force, and when the molten resin is poured, the pressure of the injected resin is applied to the head of the bolt 36 and the rubber cap 35 is deformed to change the posture of the bolt 36. May change. Further, since the threaded portion of the bolt 36 is inserted into and removed from the central hole of the rubber cap 35, the life of the rubber cap 35 is short.

The present invention solves the above-mentioned problems, and enables the inserts such as glass fiber mats and embedded bolts to be accurately positioned and held, which facilitates work, improves productivity, and improves durability. It is an object of the present invention to provide a device for mounting an insert in a mold having good properties.

[0008]

According to the present invention, an insert hole for an insert is provided on a molding surface of a mold, a piston shaft is mounted so as to be movable a predetermined distance in an axial direction of the insert hole, and the piston shaft is moved. A device for mounting an insert in a mold in which a pair of facing members which interlock with each other and move forward and backward in the direction perpendicular to the axis of the insertion hole are provided, and elastic members for sandwiching the insert are provided at the respective front ends of the facing members. Is.

[0009]

[Action]

 When the insert is pushed through the insertion hole of the mold, the piston shaft is pushed by the insert and moves for a predetermined distance, and a pair of elastic members move forward in conjunction with the movement of the piston shaft to clamp around the insert, Position and secure the insert and keep it sealed. When the mold is clamped, the resin is cured, and the resin is hardened, the mold is opened and the piston shaft is pushed down, the pair of elastic members retracts in conjunction with the piston shaft, and the clamping around the insert is released. Then, the insert is extruded by the piston shaft and the product is demolded.

[0010]

【Example】

 1 and 2 show an embodiment of the present invention. FIG. 1 is a partial cross-sectional view of a state where an insert is set in a molding die and clamped, and FIG. 2 is a state before the insert is set. FIG. In FIG. 2, the upper mold 1 is a core mold for molding the back surface of the product, and the molding surface of the upper mold 1 is formed by an electroformed shell 2, and a through hole is provided in a part of the upper mold 1 to surround the embedded bolt 12. The insertion guide 3 is attached. A mounting block 4 is installed on the back surface of the electroformed shell 2, and a mounting device for the embedding bolt 12, which will be described in detail below, is arranged on the mounting block 4, and a backup material such as resin concrete is provided around the mounting block 4. To fill. The piston shaft 5 is arranged along the axial direction of the insertion guide 3, and the lower end side thereof is supported by the guide bush 6 of the mounting block 4. The piston shaft 5 has a rack-shaped tooth profile, an O-ring 5b is provided around the lower end side, and a stopper 5c for limiting the descending position is provided at the upper end. Gears 7, 7 that mesh with the rack-shaped tooth profile 5a are provided on both sides of the piston shaft 5, and each gear 7 is provided with a slide 8 having a rack-shaped tooth profile that meshes with this gear 7, and a slide 8 formed on the piston shaft 5 through a roller 9. It is installed so as to be movable in the direction perpendicular to the axis. A clamp pad 10 made of silicon rubber is fixed to the tip of each slide 8, and the upper surface of the clamp pad 10 is arranged so as to contact the lower surface of the guide bush 6. The piston shaft 5 is formed with a recess into which the ball of the click stop 11 is fitted.

Next, mounting of the insert will be described. As shown in FIG. 2, the piston shaft 5 is supported in its lowered position by the stopper 5c, and each clamp pad 10 is in the retracted position by being linked to the piston shaft 5 via the gear 7 and the slide 8. When the embedding bolt 12 is inserted into a predetermined portion of the preformed glass fiber mat 13 and the tip of the embedding bolt 12 is pushed in from the insertion guide 3, the tip of the embedding bolt 12 pushes up the piston shaft 5 and the rack of the piston shaft 5 is moved. The toothed wheels 7, 7 meshing with the toothed tooth profile 5 a rotate in the direction of the arrow in FIG. 1, and press the clamp pads 10, 10 against the threaded portion of the embedding bolt 12 from both sides via slides 8, 8. At this time, the guide bush 6 guides the movement of the piston shaft 5 in the axial direction and prevents each clamp pad 10 from moving upward. The movement of the piston shaft 5 is stopped at the click stop 11 when the embedding bolt 12 is pushed in for a predetermined distance. As shown in FIG. 3, the tip surface of each clamp pad 10 is formed in a semi-cylindrical recess having a diameter matching the direct diameter of the embedding bolt 12, so that when the embossing bolt 12 is pressed, As shown in FIG. 4, the embedded bolt 12 is cut into the threaded portion to fix the embedded bolt 12 and to seal around the threaded portion.

A glass fiber mat is set also in the lower mold, the mold is closed, and molten resin is poured into the cavity and cured. The inserted glass fiber mat 13 is supported by the embedding bolt 12 and accurately positioned and held in the cavity. Since the embedding bolt 12 is clamped from both sides by the clamp pads 10 and 10, the molten resin Even if the pressure is applied, the insert does not displace, and since the periphery of the threaded portion of the embedding bolt 12 is sealed by the clamp pads 10 and 10, the molten resin does not enter. If the insertion guide 3 is made of silicone rubber and its hole diameter is set to be slightly smaller than the outer diameter of the screw portion of the embedding bolt 12, resin can be prevented from attaching to the screw base portion of the embedding bolt 12.

After the resin is hardened, the mold is opened, the head of the stopper 5c is pushed by the pushing cylinder, and the piston shaft 5 is pushed down until the stopper 5c hits the mounting block 4, and each clamp is pushed through the gear 7 and the slide 8. The pad 10 retracts from the embedding bolt 12 to release the fixation of the embedding bolt 12, and the embedding bolt 12 is extruded by the piston shaft 5 to release the product.

In the above embodiments, the embedding bolt 12 to be inserted is manually inserted by pushing it from the insertion guide 3, but a setting jig with a magnet is attached to the tip of the robot arm to suck the embedding bolt 12. It is also possible to insert it into the insertion guide 3. In this case, it is preferable to provide a conical taper around the hole on the inlet side of the insertion guide 3 as illustrated. In addition, if a vacuum suction device is attached to the tip of the robot arm when demolding, and the product is sucked and transported, the set of inserts and demolding and transport of the product can be automated, resulting in significant labor saving. Can be achieved.

[0015]

[Effect of device]

 The present invention makes it easy to set the insert in a desired position in the mold, enables the insert to be accurately positioned and held, and allows the mounting device to be repeatedly used, thereby improving productivity. Can be improved.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the state before mounting the insert of FIG.

FIG. 3 is an explanatory diagram of a main part of FIG.

FIG. 4 is an explanatory view of an operating state of FIG.

FIG. 5 is an explanatory view of a conventional insert method.

FIG. 6 is a rear view of the upper mold seen from the direction of XX in FIG.

FIG. 7 is an explanatory view of another conventional insertion method.

[Explanation of symbols]

1 Upper mold 2 Electroformed shell 3 Insertion guide 4 Mounting block 5 Piston shaft 6 Guide bush 7 Gear
8 slide 10 clamp pad 11 click stop
12 Embedded bolt 13 Glass fiber mat

Claims (1)

[Scope of utility model registration request] 1. An insertion hole for an insert is provided on a molding surface of a mold, and a piston shaft is arranged so as to be movable a predetermined distance in an axial direction of the insertion hole, and an axis line of the insertion hole is interlocked with the movement of the piston shaft. A pair of facing members that move forward and backward in a right angle direction are provided, and an elastic member that sandwiches the periphery of the insert is provided at the tip end of each of the facing members.