JPS5937215B2 - Synthetic resin mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold for injection molding and transfer molding of synthetic resin.

In the above mold, as shown in FIG.
When forming a mold, a slide core is required in the mold on the movable side or the fixed side.

When making an undercut C1 on the outer periphery of the molded product,
The angular pin attached to the mating mold allows the slide core to be easily moved in and out as the mold is opened and closed.

However, when attaching undercut C2 to the inner periphery of the molded product, the slide core cannot be moved by the angular pin of the mating mold, so the slide core must be moved using a rack and pinion mechanism that is linked to the opening and closing of the mold or by a hydraulic cylinder. It moves the core.

However, if the slide core is driven by the above-mentioned rack and pinion mechanism or hydraulic cylinder, the structure of the mold becomes complicated, the design becomes difficult, and the cost of the mold becomes high. An object of the present invention is to provide a mold that solves the above-mentioned problems of conventional synthetic resin molds.

An embodiment of the mold according to the present invention will be described below with reference to the drawings.

1 is a stationary mold, 2 is a movable mold, and the movable mold 2
A pair of inner and outer slide cores 3 and 4 are provided at predetermined positions for forming undercuts C1 and C2 on both sides of the molds 1 and 2 in a direction perpendicular to the opening and closing direction.

The stationary mold 1 is provided with an angular pin 5 and a wedge 6 that act on the outer slide core 4.

An angular rod 7 is attached to the movable mold 2 so as to be movable in the axial direction thereof, and one end of the rod T is connected to the inner slide core 3 and the other end to the ejector plate 8. An ejector pin 9 is attached to the ejector plate 8. 10
is an ejector rod.

The surface opposite to the mold surface of the inner slide core 3, that is, the inner surface 3
1 is a mold 2 with a slope in order to give the core 3 a wedge function.
is in contact with

Since the undercuts C1 and C2 are located apart from the main body of the molded product A, the outer slide core 4 is supported by the tunnel-shaped guide groove 11 formed in the movable mold 2.

In FIG. 1, the molds 1 and 2 are closed, and the inner and outer slide cores 3 and 4 are butted against each other by the action of the angular rod 7 and the angular pin 5, respectively, and their back surfaces are pressed by the slope 31 and the wedge 6. An undercut cavity 12 is formed.

In this state, molten resin is injected from the gate 13 into the cavities 14 and 12. FIG. 3 shows a state in which the movable mold 2 is retracted and the mold is opened, and the outer slide core 4, which has been released from the restraint by the angular pin 5, moves outward until it hits the stopper 16 under the action of the spring 15 and moves outward. It separates from the undercut portion C1.

Figure 4 shows that the movable mold 2 is further retreated and the ejecting rod 1
0 acts on the ejector plate 8, and the molded product A is separated from the mold by the ejector pin 9.

At this time, as the ejector plate 8 moves forward, the inner slide core 3 is pushed out of the movable mold 2 via the angular rod 7 and is separated from the inner undercut portion C2, allowing the molded product A to be taken out. The above-described movement in and out of the inner and outer slide cores 3 and 4 is determined by the inclination angle and movement stroke of the angular rod 7 and angular pin 5.

As described above, in the molding die of the present invention, in order to form undercuts C1 and C2 on both sides of the molds 1 and 2 in the direction perpendicular to the opening and closing direction, a pair of inner and outer slide cores 3 and 3 are provided on the movable mold 2.
4, the outer slide core 4 is connected to the molds 1 and 2 by an angular pin 5 attached to the stationary mold 1 as in the conventional device.
The inner slide core 3 is moved in and out by the angular rod 7 which is linked to the molded product extrusion mechanisms 8 to 10. The inner slide core, which was previously moved in and out, can be moved in and out using the movement of the molded product extrusion mechanism that molds 1 and 2 are always equipped with, which simplifies the structure of the mold, and also allows the slide core to move in and out. This also has the effect of ensuring the operation of the core.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the mold of the present invention when the mold is clamped;
The figure is a vertical side view of the outer slide core, Figures 3 and 4 are vertical front views when the mold is opened and the molded product is extruded, and Figure 5 is a vertical slope view of the molded product. 1 is a stationary mold, 2 is a movable mold, 3 is an inner slide core, 4 is an outer slide core, 5 is an angular pin, 6 is a wedge, 7 is an angular rod, and 8, 9, and 10 are molded product extrusion mechanisms.

Claims (1)

[Claims] 1 A pair of inner and outer slide cores for forming undercuts on both sides in the direction perpendicular to the opening/closing direction of the mold are provided in the movable mold, and the outer slide core is connected to the mold by an angular pin attached to the stationary mold. A synthetic resin molding die characterized in that the inner slide core is moved in and out by an angular rod that is linked to a molded product extrusion mechanism.