JP3312209B2 - Mold equipment for insert molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert molding die apparatus in which an insert work is arranged in a mold and the insert work is fixed to a molded product simultaneously with molding.

[0002]

2. Description of the Related Art Conventionally, there have been known insert molding die apparatuses as shown in FIGS. A fixed mold plate 102 is fixed to the fixed side of the molding machine 101, and a plate 104 having a sprue hole 103 is fixed to the fixed mold plate 102. Further, a work holding hole 106 in which an insert work 105 is inserted and held is formed on an end surface of the plate 104 opposite to the fixed mold plate 102. Then, when injection molding is performed, the work holding hole 1 is formed so that burrs and the like do not occur on the finished molded product.
The clearance between the inner diameter of 06 and the outer diameter of the insert work is set very small (about 0.01 to 0.02 mm). Further, the end face of the work holding hole 106 has a sharp edge portion 1.
06a.

[0003] At a position facing the plate 104, a cavity plate 108 in which a cavity 107 to be a molded product is formed is disposed. The cavity plate 108 has a sprue hole 10
A runner hole 109 connecting the cavity 3 and the cavity 107 is also formed. Reference numeral 110 denotes an ejector pin for ejecting a molded product when the mold is opened, and reference numeral 111 denotes a runner ejector pin for ejecting a runner.

Next, the operation will be described. With the mold expanded, insert work 105 is inserted into work holding hole 106.
Is inserted manually or by an accurate robot. After the work is inserted, the mold is closed and injection molding is performed. After the molding is completed, the mold is expanded again, and the molded product formed by the ejector pins 110 and the runner ejector pins 111 is protruded from the mold. An insert work 105 is fixed to the protruded product as shown in FIG.

[0005]

However, as described above, the work holding hole 106 and the insert work 105
Is very small, and insertion is difficult due to the formation of the edge 106a. Therefore, the insert work must be manually inserted, resulting in poor productivity. In addition, although the use of a robot may be considered, the edge work 106a or the work itself may be damaged by the insert work, so that an expensive and highly accurate robot that operates accurately must be used.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems by disposing an insert work in a mold in advance, and simultaneously fixing the insert work with a cavity molded product simultaneously with molding. in the insert molding die apparatus, and disposed work holding plate, wherein through the workpiece holding hole in a work holding plate, taper for inserting the workpiece at the opposite end a cavity Tay plate
-It is characterized in that a planar expansion guide is formed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention shown in FIGS. 1 to 5 will be described in detail. A sprue plate 4 in which a part of a sprue hole 3 is formed is fixed to a fixed side template 2 attached to a fixed side of the molding machine 1. A positioning pin 6 for positioning an insert work 5 described later is fixed to the sprue plate 4. However, when the positioning height of the work is the same as the work holding plate 7 described later (thickness). Does not require this positioning pin 6.

Further, a work holding plate 7 is arranged at a position facing the sprue plate 4, and is connected to the sprue plate 4 by a stop bolt 8. The work holding plate 7 slides and moves the stop bolt 8. The work holding plate 7 is similarly formed with the sprue hole 3 communicating with the sprue hole 3 of the sprue plate 4.

Further, a work holding hole 9 through which the insert work 5 is inserted and held is formed in the work holding plate 7 so as to pass therethrough. Are formed on the tapered surface (shape) 10 so as to be easily inserted. In addition, the clearance between the outer diameter of the work 5 and the inner diameter portion 11 of the end surface of the end surface inner diameter portion 11 on the opposite side to the tapered surface 10 is approximately 0.01 to 0.01 as in the related art.
It is formed to be 0.02 mm.

Further, at a position facing the work holding plate 7, a cavity plate 13 having a cavity 12, which is a molding portion for molding a molded product, is disposed. The sprue hole 3 and the cavity plate 13
Are also formed. The work holding plate 7 is fixed to the movable side of the molding machine 1, and the ejector pins 15 and the runner ejector pins 1 for projecting the molded product after the completion of molding as in the prior art.
6 are provided internally. Reference numeral 17 denotes an escape hole into which the stop bolt 8 is inserted when the mold is closed.

Next, the operation will be described. The insert work 5 is inserted into the work holding hole 9 of the work holding plate 7 from between the sprue plate 4 and the work holding plate 7 in a state where the mold is expanded. That is, the insert work 5 is inserted from the direction of the tapered surface 10 of the work holding hole 9 (see FIG. 1). This work insertion work is performed by the work holding hole 9.
Is inserted into the tapered surface 10, so that even if it is slightly shifted, it is guided by the tapered surface. Therefore, even if it is not an expensive and highly accurate robot, it can be inserted by a general robot or the like. Next, the mold is closed. In the closing process, the positioning pin 6 presses the insert work 5 (see FIG. 2), and the insert work 5 is accurately positioned with the mold completely closed (FIG. 3). reference). Next, the resin is poured into the cavity 12 with the mold closed, and injection molding is performed. After the molding is completed, the mold is expanded.
In the course of the expanding operation, the work holding plate 7 is stopped at the intermediate portion by the connecting rod (see FIG. 4). In this process, the molded product is fixed to the cavity 12. When the mold is further expanded, the molded product and the runner are protruded by the ejector pins 15 and the runner ejector pins 16 by the movement of the cavity plate 13 and the molding is completed (see FIG. 5).

In order to prevent the insert work 5 from dropping out of the work holding hole 9 during the closing process of the mold, it is preferable to attach a ball plunger 18 to the work holding hole 9 as shown in FIG. 6 or an O-ring as shown in FIG. .

FIG. 8 shows a second embodiment of the present invention, in which the work holding plate 7 is attached to the mold itself with the stop bolts 8, but the work holding plate 7 is made detachable. May be attached to the mold before closing. In this case, if the guide pins 20 are fixed to the cavity plate 13 and the guide holes 21 that engage with the guide pins 20 are formed in the work holding plate 7, positioning becomes easy.

[0014]

According to the present invention, in an insert molding die apparatus in which an insert work is previously arranged in a mold and the insert work is integrally fixed to a cavity molded product at the same time as molding. To insert the work into the work holding plate, penetrate the work holding hole, and insert the work into the end opposite to the cavity plate.
Since the tapered expansion guide portion is formed, it is possible to provide a mold device with good productivity without damaging the work holding hole and the insert work itself.

[Brief description of the drawings]

FIG. 1 is a front view when a mold is opened and an insert work is inserted in a first embodiment of the present invention.

FIG. 2 is a front view of the mold shown in FIG.

FIG. 3 is a front view after completion of mold clamping in FIG. 2;

FIG. 4 is a front view of the mold shown in FIG. 3 during opening.

FIG. 5 is a front view when the molded product of FIG. 4 is projected.

FIG. 6 is a front cross-sectional view of another embodiment of the holding portion for the insert work of the present invention.

FIG. 7 is yet another front sectional view of the insert work holding portion of the present invention.

FIG. 8 is a front view of the second embodiment of the present invention when a mold is opened and an insert work is inserted.

FIG. 9 is a front view of the conventional device when the mold is closed.

FIG. 10 is a front view when an insert work is inserted in FIG. 9;

FIG. 11 is an external perspective view of a molded product of a conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forming machine 2 Fixed side template 3 Sprue hole 4 Sprue rate 5 Insert work 6 Positioning pin 7 Work holding plate 9 Work holding hole 10 Tapered surface 12 Cavity 13 Cavity plate

Claims (1)

(57) [Claims] 1. An insert molding die apparatus in which an insert work is arranged in a mold in advance, and the insert work is integrally fixed to a cavity molded product simultaneously with molding, wherein a work holding plate is provided, The work holder
Through the workpiece holding hole in lifting plates, tapered surfaces shaped for inserting the workpiece at the opposite end a cavity Tay plate
A mold device for insert molding, wherein an expansion guide portion is formed.