JPH0569444A - Insert mold - Google Patents

Abstract

PURPOSE:To obtain an insert mold preventing resin from entering the screw hole part of an insert part. CONSTITUTION:A recessed part 3 is provided to the inner surface of the cavity 2 of a mold 1 and the bolt part 7 provided to the leading end of a jig 6 is screwed in the screw hole 4 provided to an insert part 5 to attach the insert part 5 to the jig 6. The base part 8 of the jig 6 is fitted in the recessed part 3 in a freely detachable manner to set the insert part 5 to time inner surface of the cavity 2. Since the bolt part 7 of the jig 6 is screwed in the screw hole 4 of the insert part 5, a resin can be prevented from entering the screw hole 4.

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 for molding using an insert part having a screw hole.

[0002]

2. Description of the Related Art There are various molding dies 1 used to obtain a plastic molded product 9 using an insert part 5 having a screw hole 4, and the structure of the insert molding dies 1 by compression molding is shown in FIG. .. In this structure, the pin 13 is provided so as to project from the inner surface of the cavity 2 of the molding die 1, and the screw hole 4 of the insert component 5 provided with the screw hole 4 is removably fitted to the insert component to thereby insert the insert component. 5 is set on the inner surface of the cavity 2.

[0003]

In the insert molding die 1, as shown in FIG. 3, one surface of the molding die 1 in which the pin 13 is formed by the upper molding die 1a and the lower molding die 1b. Insert part 5
Is held only on one side where the pin 13 is fixed, and when the cavity 2 is filled with resin at the time of molding, the insert part 5 is easily lifted or displaced from the pin 13, and at that time, the screw of the pin 13 and the insert part 5 is screwed. The resin easily enters the gap between the holes 4 and burrs, which easily forms on the inner circumference of the screw hole 4. Therefore, there is a problem that burrs are attached to the screw holes 4 and the screw holes 4 cannot be used.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an insert molding die capable of preventing resin from entering a screw hole of an insert part to generate burrs. To do.

[0005]

According to the present invention, a concave portion 3 is provided on an inner surface of a cavity 2 of a molding die 1, and a screw hole 4 of an insert component 5 having a screw hole 4 is provided at a tip of a jig 6. Insert the bolt 5 into the jig 6 by screwing and connecting the bolt 7
It is characterized in that the insert part 5 is set on the inner surface of the cavity 2 by attaching the base part 8 of the jig 6 and removably fitting the base part 8 of the jig 6 into the concave part 3.

[0006]

According to the present invention, since the insert part 5 and the jig 6 are screwed together, the resin does not enter into the screw hole 4 of the insert part 5 during molding, and burrs are generated in the screw hole 4. The jig 6 can be removed from the insert part 5 integrated with the plastic molded product 9 after the mold is removed.

[0007]

EXAMPLES The present invention will be described in detail below with reference to examples. Figure 2
2A is a sectional view of the insert part 5 and the jig 6, and FIG. 2B is an insert part 5 screwed and coupled with a recess 3 provided in the inner surface of the cavity 2 of the lower molding die 1b.
And a sectional view of the jig 6. The jig 6 has a cylindrical shape,
The upper end portion is provided with a bolt portion 7, and the lower end portion is provided with a small recess 10 into which a tip of a flat-blade screwdriver or a hexagon wrench can be inserted. The insert part 5 has a structure in which a screw hole 4 is provided so as to open on one surface. The insert part 5 can be attached to the jig 6 by screwing and coupling the bolt portion 7 of the jig 6 into the screw hole 4 of the insert part 5 for about one rotation. As shown in FIG. 2B, the concave portion 3 provided on the inner surface of the cavity 2 is a cylindrical hole having an inner diameter substantially equal to the diameter of the base portion 8 of the jig 6, and the base portion 8 of the jig 6 is By fitting in the concave portion 3, the insert component 5 can be set in the molding die 1 together with the jig 6. Further, the surface of the insert part 5 provided with the screw holes 4 is set so as to be in close contact with the inner surface of the cavity 2 of the molding die 1.

FIG. 1 shows an upper molding die 1a and a lower molding die 1
2A and 2B are cross-sectional views of an insert molding die 1 formed with the parts b and b. FIG. 7A is a cross-sectional view at the time of molding, and FIG. At the time of molding, as shown in FIG. 1 (a), the upper molding die 1a and the lower molding die 1b are clamped to form a cavity 2 between the two dies 1a and 1b. , BMC, SM in this cavity 2
When a thermosetting resin such as C or phenol resin or a thermoplastic resin is filled and molded, a plastic molded product 9 in which the insert component 5 is inserted is obtained. At this time, since the opening of the screw hole 4 is closed by screwing the bolt portion 7, the resin does not enter the screw hole 4 portion of the insert component 5. After molding Upper mold 1a and Lower mold 1b
When and are divided by a parting line 11 and the molded product 9 and the jig 6 are pushed upward by the knockout pin 12, the molded product 9 and the insert component 5 integrated with this, and the insert component 5 are screwed and coupled. The jig 6 being pushed is extruded from the molding die 1. Then, a minus or a plus driver or a hexagon wrench is inserted into the small recess 10 provided in the lower portion of the jig 6 and screwed, and the bolt portion 7 is removed from the screw hole 4 of the insert component 5, thereby forming the molded product 9
The jig 6 can be removed from the. Jig 6 removed
Can be used many times by screwing it into another insert part 5 again, and the molding cycle can be accelerated because the next molding can be prepared during the curing time of the resin. The workability is improved because the insert component 5 can be easily set only by fitting the jig 6 into the recess 3 even in a place where it is difficult to set the insert component 5 such as a narrow portion of the inner surface of the cavity 2. As described above, since the resin does not enter the screw hole 4, burrs do not adhere to the screw hole 4, and burrs adhere to the inner periphery of the screw hole 4 to make the screw hole 4 unusable. It will disappear. The present invention can be used not only for direct pressure molding but also for general insert molding such as injection molding.

[0009]

As described above, according to the present invention, a concave portion is provided on the inner surface of a cavity of a molding die, and a bolt portion provided at the tip of a jig is screwed into a screw hole of an insert part provided with a screw hole. Since the insert part is attached to the jig and the base part of the jig is detachably fitted into the recess, the insert part is set on the inner surface of the cavity. Since the bolt part of the tool is screwed in and resin does not enter into the screw hole of the insert part, it is possible to prevent burrs from adhering to the screw hole. This eliminates the problem that holes cannot be used.

[Brief description of drawings]

1A and 1B show one embodiment of the present invention, in which FIG. 1A is a cross-sectional view of an insert-molding die during molding, and FIG. 1B is a cross-sectional view of the insert-molding die during demolding.

2A and 2B show an embodiment of the present invention, in which FIG. 2A is a sectional view of an insert part and a jig, and FIG. 2B is an insert part screwed and coupled to a recess provided in an inner surface of a cavity of a molding die. It is sectional drawing of a jig.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 2 Cavity 3 Recess 4 Screw hole 5 Insert part 6 Jig 7 Bolt part 8 Base part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B29K 105: 20 B29L 1:00 4F

Claims (1)

[Claims] 1. An insert part is attached to a jig by screwing and coupling a bolt part provided at the tip of a jig into a screw hole of an insert part provided with a recess on the inner surface of a cavity of a molding die. The insert molding die is characterized in that the insert part is set on the inner surface of the cavity by removably fitting the base of the jig into the recess.