JPS5854991Y2 - Injection molding machine slide pin operating mechanism - Google Patents

Description

[Detailed description of the invention] This invention is an operating mechanism for a slide pin used to form a hole in a molded product when molding a material using an injection molding machine. Regarding.

Conventionally, a slide pin was installed to form a hole, etc. in a molded product when molding a material with an injection molding machine, and it was especially used to align two molds (a fixed mold and a movable mold) used in an injection molding machine. A mechanism for pushing a slide pin from obliquely downward into a cavity formed in a face (parting face) is disclosed in Japanese Patent Application Laid-Open No. 48
As shown in Japanese Patent No. 70755, there is one based on a link mechanism.

However, this link mechanism has the drawback that the only means for extracting the slide pin from the product after injection molding is a spring attached to the link mechanism, and that the slide pin cannot be extracted reliably.

In view of the above, the purpose of this invention is to provide a slide pin operating mechanism that can reliably extract the slide pin from an injection molded product when the slide pin in an injection molding machine is operated by a link mechanism. That is.

Next, this invention will be explained based on embodiments shown in the drawings.

In the figure, a fixed mold 2 attached to the upper surface of a bed 1 of an injection molding machine has a slide pin insertion hole 2a formed diagonally upward on its side.

A movable mold 3 attached to the lower end of a ram (not shown) of an injection molding machine has a cavity 3a for forming a product formed on the side that is pressed against the fixed mold 2 when the ram reaches the bottom dead center. .

A slide pin 4 is inserted into the slide pin insertion hole 2a of the fixed mold 2.
is inserted.

This slide pin 4 has a protrusion 4a at the center of the upper end and a head 4b at the lower end.

The head 4b of this slide pin 4 is attached to the slide plate 5.

The support shaft 6 is supported at both ends by brackets (not shown) provided on the fixed mold 2, and the near portion is swingably attached to the support shaft 6 at its center.

The lever 7 has one end attached to the pin 8 on the protrusion 5a of the slide plate 5.
The other end of the link 9 is connected by a pin 10.

The lever 7 has a passive arm 7a at the other end that engages with the lower end of a hanger 11 provided on the movable mold 3.

That is, when the hanger 11 descends as the movable mold 3 descends, the protrusion 11a at the lower end of the hanger 11 pushes down the upper surface of the passive arm 7a of the lever 7, causing the lever 7 to move counterclockwise in FIG. Rotate.

Also, when the hanging hand 11 rises from the bottom dead center (the position shown in FIG.
Pull the lower end of the lever to raise it, and rotate the lever 7 clockwise.

However, in this case, when the lever 7 rotates slightly clockwise, the lock part 11b of the hanging hand 11 is disengaged from the passive arm 7a of the lever 7, so that the lever 7 is no longer It cannot be rotated.

A pair of guide pins 12.12' are attached to the fixed mold 2 on both sides of the slide pin 4 in parallel with the slide pin 4, and the slide plate 5 is slidable relative to each guide pin 12.12'. ing.

This slide plate 5 has guide pins 12, 12'
The slide pin 4 moves smoothly within the slide pin insertion hole 2a.

Compression springs 13 and 13' are fitted between the fixed mold 2 and the sliding plate 5, respectively, on the outside of the guide pins 12 and 12', and have the effect of separating the sliding plate 5 from the fixed mold 2.

Next, the operation of this embodiment will be explained.

First, I will explain the state in which the ram of the injection molding machine is raised and the movable mold 3 is separated from the fixed mold 2 (see Figure 2).
When the ram descends and the movable mold 3 and the hanging hand 11 attached to this movable mold 3 descend, the protrusion 11 of the hanging hand 11
After a contacts the upper end of the passive arm 7a of the lever 7, the upper end is pushed down.

As a result, the lever 7 rotates counterclockwise about the support shaft 6, and the link 9 connected to the lever 7 by the pin 10 is pushed up.

When the link 9 is pushed up, the slide plate 5 connected to the link 9 by the pin 8 is moved by the guide pins 12 on both sides.
．． 12' and coil springs 13,1
3' rises while being compressed against the applied force, and pushes up the slide pin 4.

When the movable mold 3 reaches the bottom dead center and is pressed against the fixed mold 2, the slide pin 4 reaches the top dead center and the protrusion 4a at the tip thereof is located in the cavity 3a of the movable mold 3. .

In this state, a molding material is injected into the cavity 3a from the fixed mold 2 side by a device not shown.

After injection molding is completed, the injection molding machine enters the mold opening process,
As the ram rises, the movable mold 3 also rises.

As the movable mold 3 rises, the hanging hand 11 rises, hits the near passive arm 7a with its lower end hook portion 11b, and then pulls up the passive arm 7a.

Therefore, the lever 7 rotates clockwise around the support shaft 6.

When the lever 7 rotates, the link 9 connected to the lever 7 through the pin 10 is pulled down, and the slide plate 5 connected to the link 9 through the pin 8 moves to the guide pin 12.12'.
You will be guided down.

As the slide plate 5 descends, the slide pin 4 is pulled down and its protrusion 4a is pulled out from the product W formed within the cavity 3a.

When the slide pin 4 is slightly separated from the product W, the slide plate 5 is further pushed down by the urging force of the compression springs 13, 13', so that the slide pin 4 is also pushed down to the bottom dead center position.

As mentioned above, when the slide pin 4 descends, the movable mold 3
A hole W1 formed by the projection 4a of the slide pin 4 is formed in the product W in the cavity 3a.

When the movable mold 3 reaches the top dead center, the workpiece W in the cavity 3a is taken out, and then the movable mold 3 enters a mold closing process, and the injection molding process is repeated.

As mentioned above, this invention has two types: a fixed type that has a slide pin with a protrusion in the slide pin insertion hole and is attached to a bed, and a fixed type that is attached to a ram. A movable mold that opens and closes against the fixed mold and forms a product molding cavity when closed, a spring that biases the protrusion of the slide pin in the direction of drawing it into the slide pin insertion hole, and a support shaft provided on the fixed mold. A lever that is rotatably supported by the lever, a link that connects the end opposite to the protrusion of the slide pin and one end of the lever, and a protrusion on the lower end that is integrally formed with the movable mold and is supported during the closing stroke of the movable mold. In an injection mold that has a handle that presses the other end of the lever, rotates the lever, and pushes out the protrusion of the slide pin into the cavity, and injects material into the cavity to mold the product. , the slide pin operating mechanism is configured by providing a hook part on the handle that engages with the other end of the movable type during the opening stroke and rotates the lever in the opposite direction to the closing stroke;
After the material is injected into the cavity formed by the movable mold and the fixed mold to mold the product, when the movable mold is opened from the fixed mold, a lock provided on the hanger integrally formed with the movable mold is used. The part engages with the other end of the lever, rotates the lever in the opposite direction to the closing stroke, and pulls out the protrusion of the slide pin from the product in the cavity, so if for some reason the protrusion of the slide pin Even when it becomes difficult to separate from the product, the slide pin can be reliably pulled out from the product.

[Brief explanation of the drawing]

The figures show one embodiment of this invention, in which Figure 1 shows the movable mold in a closed state relative to the fixed mold, Figure 2 shows the movable mold in an open state, and Figure 3 shows the fixed mold. It is a figure which shows the attachment state of the guide pin to. 1... Bed, 2... Fixed type, 2a.
...Slide pin insertion hole, 3...Movable type, 3a...Cavity, 4...Slide pin, 6...Spindle, 7 ... lever, 9
...Link, 11...Hanging hand, W...
...Product, Wl...Hole.

Claims (1)

[Scope of utility model registration request] A fixed mold that has a slide pin with a protrusion in the slide pin insertion hole to form a hole in the product during product molding and is attached to a bed, and a fixed mold that is attached to a ram and opens and closes against the fixed mold when closed. a movable mold that forms a product molding cavity together with the fixed mold; a spring that biases the protrusion of the slide pin in the direction of drawing it into the slide pin insertion hole;
A lever rotatably supported by a support shaft provided on the fixed mold, a ring that directly connects the end opposite to the protrusion of the slide pin and one end of the lever, and a movable mold integrally formed with the movable mold. During the closing stroke, the protrusion at the lower end presses the other end of the lever to rotate the lever and push the protrusion of the slide pin into the cavity, and the material is injected into the product molding cavity. In the injection mold that molds the product,
The hanger is provided with a hook that engages with the other end of the movable mold during the opening stroke, rotates the lever in the opposite direction to the closing stroke, and pulls out the protrusion of the slide pin from the product in the cavity. A slide pin operating mechanism characterized by: