JPS5823560A - Two-stages ejecting and molding device for dies for insert injection molding - Google Patents

Abstract

PURPOSE:To make a device simple by making the simultaneous operation of two sets of ejector pins of different strokes and the combination use of a guide pin and an ejector pin possible. CONSTITUTION:While dies are held open, an insert part 3 is supplied to a guide and ejector pin 7, by which the part is positioned. The part 3 is sandwiched by upper, lower cavities 1, 2 and is accurately positioned. A sprue 5 is cut and the cavities 1, 2 open. Upon completion of die opening, the ejecting rod for removing material pushes an ejector plate 8. a sliding rod 16 provided in the plate 8 stops by abutting on a back plate 13, then the plate 8 advances further until the steel ball 18 fitted in the annular groove 21 provided to the rod 16 disengages and the stroke of the plate 8 is freed. The pin 6 and the pin 7 of different strokes start removing the material simultaneously and a molding 4 is disengaged and removed from the pins 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insert injection molded part, and to a two-stage ejection molding apparatus for feeding the insert part and after molding.

The purpose of the present invention is to provide an inexpensive molded filtration product with a simpler structure than that in which the insert part t for feeding material into the mold and the guide pin for guiding, holding, and positioning are also used as an ejector turbine. There is a particular thing.

Another object of the present invention is to provide two different ejector strokes.
A set of ejector turbines are in a two-stage ejection mechanism operated simultaneously by a set of ejector plates.

jl of the present invention! Another purpose is to provide smooth operation and a small two-stage ejection machine #IIt.

Conventionally, the guide pins that guide, hold, and position the insert parts fed into the mold were made of gold f! IK was fixed. Therefore, when removing the molded product, deformation of the pipe may occur.

In addition, in the most common mechanism, where all ejector turbines are attached to one set of ejector plates, the dual-purpose guide pin has the same stroke as the other ejector turbines, so the insert molded product is There was a flaw that couldn't be overcome.

Furthermore, the usual two-stage ejection mechanism requires two sets of ejector plates, cannot be made compact, and has the drawback that it is difficult to bring ejector turbines with different strokes close to each other.

The present inventor has removed such drawbacks, and an embodiment thereof will be explained using FIGS. 1 and 1112.

Figure 1 is a detailed view of the molded parts of the mold for insert injection molded parts. In Figure 0, 1 is the upper cavity and 2 is the lower cavity. In between the upper cavity and the lower cavity, insert parts 3 are assembled, and product 4 is injection molded. For material removal, there are an ejector turbine 6 and an ejector turbine 7 that also serves as a guide bin. Conventionally, a Nijief turbine 7Fi, which also served as a guide bin, was fixed to the lower cavity 2 as a central core bin. Therefore, since only the ejector turbine 6 was used during material removal, there was a drawback that the product was deformed due to bite around the central core bin. Furthermore, if the eject turbine 7 attached to the guide pin has the same differential movement as the eject turbine 6, there is a drawback that the insert molded product cannot be removed from the guide pin.

In the present invention, when supplying material to the insert part stP mold, the kite bin/ejector turbine 7 functions as a guide pin. The mold is closed and the injection molding is finished.
When the mold opens and ejects @t, the ejector 6 and the ejector turbine that also serves as a guide bin start moving at the same time, but there is a difference in stroke, and the ejector turbine 7 that also serves as a guide bin starts moving.
Even after the movement stops, the ejector turbine 6 does not stop moving and pulls out the insert molded part 4t from the guide bin and ejector turbine 7, and then stops.

This two-stage protruding material removal mechanism t1 1 shown in FIGS. 2 and 5
8 in the figure, which will be explained based on an embodiment, is a set of ejector plates, and an ejector rod 9 directly connected to this.
and a second ejector plate 10, and an ejector turbine 6 fixed to the second ejector plate 10. A guide pin 12 is used to position the #12 ejector plate 10, a coil spring 11 is provided to pack the second ejector plate, and a pack plate 13 is provided to pack the second ejector plate.

On the other hand, the upper part K I of one set of ejector plate 8
A slide rod 16 is located in the hole drilled in the a k support shaft. This slide rod 16 has an annular groove 21 and is directly connected to the guide bin/eject turbine 7.

In the upper part of one set of ejector plates 8, there is a hole Kt; It is fitted into the annular groove 21.

Next, the operation of the embodiment described above will be explained.

With the mold open, the insert part 3 is inserted into the guide pin ejector turbine 7KI and positioned. In this case, the insert component 3 cannot be fed or positioned without the guide pin, but the guide pin does not necessarily require accurate positioning. When the mold is next closed, the hole into which the insert part in the upper cavity is inserted serves as a guide, and the insert product is positioned accurately by sandwiching the upper and lower cavity insert parts.

When injection, cooling, and mold opening begin, the bin point gate 5 is cut, then the upper cavity and the lower cavity are opened, and the 111I process is completed. Next, the deciter extruder starts pushing the ejector plate 8 times. The ejector turbine 6 directly connected to the ejector plate 8 has the same stroke as the ejector plate, which is a maximum of m.

Kite pin trench ejector turbine 7 slide rod 16
), the slide rod has an annular groove 21 and a steel ball 1
8 and is connected to the ejector plate. The ejector turbine/guide pin 7 is connected to the ejector plate 8, so it is synchronized with the ejector plate 8, meaning that it moves simultaneously with the ejector turbine 6. When the ejector plate 80 stroke reaches jK, the slide rod 16 abuts against the pack plate 13 and stops.

As the ejector plate 8 continues to move forward, the steel ball 18 fitted into the annular groove 21 in the slide rod rides up the groove and comes off the annular groove, thereby disconnecting the slide rod 16 and the ejector plate 8, causing the ejector to move forward. Plate 8 can take a stroke of maximum ml. This means that the ejector turbine 6 and the guide bin/ejector bin 7 are simultaneously ejected. It turns out that it is a mechanism. Therefore, when taking out the insert molded product, the material is removed in a well-balanced manner, and the molded product can be removed from the guide bin and dropped to be taken out.
□ After the removal of material is completed and the ejector rod is packed, the ejector plate is rehacked using Filpa $t5.
In the slide core, a steel ball is fitted into an annular groove by a coil spring 17.

As explained above, the present invention increases the reliability of material feeding for insert parts, prevents deformation of the injection molded product during material removal, and enables reliable material removal by extracting the product from the center core pin. be.

In addition, in this figure 1111, the insert part is made into a pipe sleeve shape and the guide pin is made into a t-core, but this is just one example, and the insert part may be made into a shaft shape and the guide pin may be made into a sleeve shape.

This mechanism Fst set of ejector plates enables two-step ejection9, and is small in size, simple, and inexpensive, and operates smoothly and reliably, making it suitable for mass production.

[Brief explanation of the drawing]

Figure 1 shows an example of the uninvented device, with detailed views of the injection molded parts, and Figures tII and 2 are gold! FIG. 3 is a vertical cross-sectional view showing the Jt in a closed state, and FIG. 3 is a vertical cross-sectional view showing the connecting pipe between the annular groove and the steel ball in the slide rod. 1... Upper cavity 2... Lower cavity 5...
・Insert parts 4... Injection molded parts 5... Spool 6... Eject turbine 7... Guide bin and ejector turbine 8... Ejector plate
9... Ejector rod 10... 1112 Ejector plate 11... Coil spring 12...
Guide pin 1ijl-... Pack plate 14-...
Return bin 15...Coil spring 16...Slide rod 17...Coil/<$18...Steel ball 19
...Coil I (ne 20...set screw or more) Attorney Mogami, Patent Attorney

Claims (1)

[Scope of Claims] (II. In an insert injection molding mold equipped with a two-stage ejection material removal mechanism, two
Step ejection molding equipment. (2) A second ejector plate directly connected to the ejector plate, an ejector rod fixed to the second ejector plate, a slide rod inside the ejector plate, and the second ejector turbine fixed to the slide rod. The slide rod is provided with an annular groove or v*t-, and a coil spring incorporated in the ejector plate presses a steel ball or conical pin against the slide rod, and when the mold is closed, 1! The two-stage protrusion injection mold according to claim 1, wherein t-4I indicates that the steel ball fits into the annular groove.