JPS6212574Y2 - - Google Patents

Description

[Detailed description of the invention] This invention involves injecting fluid resin, etc. into a formwork consisting of a fixed formwork, a movable formwork, a slide core, etc., solidifying it, and then removing these formworks and molding. The present invention relates to an injection molding device that takes out molded resin.

Conventionally, this type of injection molding apparatus is shown in Fig. 1a-
The item shown in c was found. In this figure, a movable formwork 1 is provided below a fixed formwork 2 fixed to a machine frame (not shown) and can be raised and lowered, and a slide core 3 is installed between these formworks 1 and 2. It is provided. The slide core 3 is adapted to slide on the movable formwork 1 and is connected to a connecting pin 5 attached to a support portion 4 on the movable formwork 1. The connecting pin 5 has a flange 6 at the end and a support part 4.
It is constantly biased to the left in the figure by a spring 7 loaded between the two.

An inclined pin 8 is fixed to the fixed formwork 2 so as to be inclined in the moving direction of the movable formwork 1. The inclined pin 8 can be inserted into the hole 9 of the slide core 3, and as shown in FIG. It fits into the recessed part 10 of. At this time again,
The slide core 3 is located at the rightmost position, and a gap A is formed by the fixed formwork 1, the movable formwork 2, and the slide core 3. A fluid resin work B is injected into this gap A. The back support member 11 is
It is fixed to the fixed formwork 2, supports the slide core 3 from the back side in the raised position of the movable formwork 1, and prevents the slide core 3 from moving due to the pressure of the resin work B.

However, when the resin work B solidifies, Fig. 1b
As shown in FIG. 2, the movable formwork 1 is lowered, and the slide core 3 is moved to the left in the figure by the urging force of the spring 7 via the connecting pin 5. When this amount of movement exceeds S, that is, when the tip of the slide core 3 no longer interferes with the lower protrusion C of the resin work B, the push-up rod 12 protrudes from the fixed formwork 1 and the molded resin Workpiece B is pushed up and released from movable formwork 1.

Now, when the amount of protrusion of the downwardly extending portion C of the molded product is large, the amount of leftward movement of the slide core 3 must be increased accordingly, but in the configuration of the conventional device described above, the tilt Pin 8 needs to be made longer. However, if the inclined pin 8 is lengthened, the strength performance will decrease, causing breakage, and increasing the rigidity will lead to an increase in the size of the entire device, which will not only be disadvantageous in terms of installation of the device, but also cost-effective. I also don't like it.

In view of the above points, the present invention provides an injection molding device that reduces the amount of movement of the slide core, reduces the overall size of the device, reduces costs, and increases the degree of freedom in designing molded products. It was done for that purpose.

The present invention provides an elastic member between the slide core and the fixed formwork to urge the slide core toward the tip of the inclined pin, and forms a locking portion on the inclined pin to which the slide core can be locked. Either the slide core or the movable formwork is provided with an engagement pin that can prevent the slide core from separating from the movable formwork, and when the movable formwork approaches the fixed formwork, the slide core engages with the inclined pin. Located on the base side, as the movable formwork is separated from the fixed formwork,
By engaging the slide core with the engagement pin,
It slides and retreats relative to the movable formwork, and at the backward limit position, the engagement pin releases the slide core and the movable formwork, and the slide core is connected to the tilting pin via the locking part, and the movable formwork is moved. It is characterized by being separated from the formwork.

The present invention will be explained below with reference to illustrated embodiments. Second
Figures 4 to 4 show the state in which the movable formwork 1 is raised the most;
That is, a state is shown in which a gap A for injecting the fluid resin is formed between the fixed formwork 1, the movable formwork 2, and the slide core 22. The inclined pin 20 has approximately the same length as the conventional inclined pin 8, and has a collar-shaped locking portion 21 formed at its tip. The slide core 22 is formed with a locking surface 23 to which the locking portion 21 can be brought into close contact. This locking surface 2
3 is perpendicular to the axis of the tilt pin 20 and located above the lower surface of the slide core 22. On the other hand, an accommodation hole 24 is formed around the inclined pin 20 and near the joint between the slide core 22 and the fixed formwork 2 . A spring 25 is loaded in the accommodation hole 24, and thereby the slide core 22 is always urged downward. Note that instead of the spring 25, urethane rubber may be used. A locking pin 26 is provided on the slide core 22. Detent pin 26
is a groove 27 carved in the axial direction of the inclined pin 20.
The rear side thereof is supported by a set bolt 28. This prevents the slide core 22 from rotating around the inclined pin 20.

An engagement pin 29 is attached to the lower surface of the slide core 22. The head 30 of this engagement pin 29 can be engaged with a groove 31 having a T-shaped cross section carved in the movable formwork 1, and as shown in FIG.
It is designed to exit upward at the left end of 1.

Therefore, when the movable formwork 1 is lowered to start opening the mold after the resin work injected into the cavity A has solidified, the slide core 22 is moved by the spring 25 as shown in FIG. It slides on the movable formwork 1 while being biased and moves to the left. When the locking portion 21 locks on the locking surface 23 of the slide core 22, the locking pin 29 is located at the left end of the groove 31, and the slide core 22 locks on the inclined pin 20. Then, it is released from the movable formwork 1 (see Fig. 6). That is, as shown in FIG. 5, the amount of movement of the slide core 22 in the horizontal direction is approximately equal to the amount of protrusion T of the upper overhang portion D of the workpiece B, and is not related to the amount of protrusion of the lower overhang portion C. .

When the workpiece B is pushed up by the push-up rod 12 and removed from the movable formwork 1, the movable formwork 1 rises to form the cavity A again. At this time, the slide core 22 does not rotate around the inclined pin 20 due to the action of the detent pin 26, and therefore the engagement pin 29 fits into the groove 31. When the movable formwork 2 further rises, the slide core 22 moves to the right, that is, to the push-up bar 12 side, and stops at the position shown in FIG. 3.

Note that the detent pin is not necessary when a plurality of inclined pins 20 are provided, and also becomes unnecessary when the cross-sectional shape of the inclined pin 20 is formed into a rectangular, elliptical, etc. shape. Also, as shown in Figure 7,
A guide pin 32 may be made to protrude from the fixed formwork 2 parallel to the inclined pin 20, and a hole 33 through which the guide pin 32 is inserted may be bored in the slide core 22. Furthermore, the same effect can be obtained even if the fixed formwork 2 is made movable and the movable formwork 1 is fixed.

As described above, according to the present invention, the amount of movement of the slide core can be reduced, the entire device can be downsized, and the degree of freedom in designing the molded product can be increased.

[Brief explanation of the drawing]

Figures 1a, b, and c show a conventional injection molding apparatus. Figure 1a is a cross-sectional view showing the movable formwork in its highest raised state, and Figure 1b shows the movable formwork in its descending state. A sectional view, FIG. 1c is a sectional view showing the movable formwork in the lowest position, FIGS. 2 to 7 show embodiments of the present invention, and FIG. 2 is a front view of the device of one embodiment. ,
Figure 3 is a sectional view taken along the - line in Figure 2, Figure 4 is a sectional view taken along the - line in Figure 2, Figure 5 is a sectional view showing the state in which the movable formwork is being lowered, and Figure 6. 7 is a sectional view showing a state in which the movable formwork is at the lowest position, and FIG. 7 is a sectional view showing another embodiment. 1...First formwork, 2...Second formwork, 3, 22...
...Slide core, 8, 20...Slanted pin, 21...
... Locking portion, 25 ... Elastic member, 29 ... Engagement pin.

Claims (1)

[Scope of utility model registration request] The first and second parts are provided so as to be able to come into contact with each other relatively.
a formwork; a slide core provided between the first and second formworks and capable of sliding with respect to the second formwork; and is inclined with respect to the direction of the movement of the second formwork towards and away from each other and fits into the hole of the slide core,
and an inclined pin formed with a locking portion capable of locking the slide core, and an elastic member provided between the slide core and the first formwork and urging the slide core toward the tip side of the inclined pin; an engagement pin capable of coupling the slide core and the second formwork, and for releasing the slide core from the second formwork when the slide core is in the backward limit position; When the slide cores are close to each other, the slide core is located on the base side of the inclined pin, and as the first and second formworks are separated from each other, the slide core engages with the engagement pin. It slides and retreats with respect to the second formwork, and at the backward limit position, the engagement pin releases the slide core and the second formwork, and the slide core is connected to the inclined pin via the locking part. An injection molding device characterized in that the device is separated from the second mold.