JPH0638655Y2 - Mold release device for injection mold - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold releasing device for an injection molding die.

[0002]

2. Description of the Related Art In the conventional injection molding method, an apparatus for releasing a molded product from a mold is, for example, Jitsuko Sho.
As described in Japanese Patent Publication No. 6-3022 or Japanese Utility Model Publication No. 56-29130, there is known a device in which a molded product is released from a mold by two-step protrusions and the molded product is automatically dropped by its own weight. There is.

Further, in order to correspond to automatic take-out by a robot or the like, a mold release in which the stroke of an extrusion pin for releasing a molded product by the action of pressure fluid can be easily adjusted as in Japanese Patent Application No. 59-55790. Devices have also been proposed.

[0004]

However, the former device has a problem that a molded product is soiled or damaged due to automatic dropping.

Further, the latter device has a problem that the molded product is limited to a container type and the manufacturing cost is increased.

Therefore, according to the present invention, when the molded product is ejected from the mold body by the projecting mechanism, the molded product is held in a state of being floated from the mold so as not to fall, facilitating the removal thereof and reducing the manufacturing cost. An object of the present invention is to provide a mold releasing device for an injection molding die that can be reduced in number.

[0007]

In order to achieve the above object, the first invention is to provide a first ejector pin 6 fixed to an ejector plate 30 and an ejector plate 3.
0 through the upper plate 30a slidably, the step 8 and the collar 9
A slide cam in which a second ejector pin 7 provided with the ejector plate 30 is slidably housed in the lower plate 30b of the ejector plate 30 and a horizontal surface 53 and an inclined slide surface 51, which are in contact with the collar portion 9, are continuously provided on the upper surface at one end. 5 and mounting board 4
And a stepped portion 8 of the second ejector pin 7 abuts the core plate 2 when the mold opening operation is performed.
It is characterized in that the slide cam 5 slides by the inclined pin 11 and the collar portion 9 slides on the slide surface 53 so that the first ejector pin 6 and the second ejector pin 7 have a protrusion difference.

The second invention is that the first ejector pin 6 fixed to the first ejector plate 30 and the upper plate 30a of the ejector plate 30 are slidably penetrated, and the step portion 8 and the collar portion 9 are formed. A slide in which the second ejector pin 7 provided and a lower plate 30b of the first ejector plate 30 are slidably accommodated, and a horizontal surface 53 and an inclined slide surface 51 on which the flange 9 abuts are continuously provided on the upper surface at one end. The cam 5, the inclined pin 11 fixed to the mounting plate 4 and slidably penetrating the slide cam 5, and the first ejector plate 30 are arranged at a predetermined interval.
And a second ejector plate 20 through which the second ejector pins 6 and 7 slidably pass, and a second ejector pin 7 slidable in the upper plate 20a of the second ejector plate 20 and a spring. And an ejector stopper 14 which is biased to be protruded from the upper plate 20a by a predetermined amount and is externally fitted to the upper plate 20a, and the step portion 8 of the second ejector pin 7 is inserted through the spring 15 and the ejector stopper 14 when the mold opening operation is performed. While contacting the plate 2, the slide cam 5 slides by the inclined pin 11 so that the collar portion 9 slides on the slide surface 51, so that a protrusion difference c is generated between the first ejector pin 6 and the second ejector pin 7. It is characterized by having done.

[0009]

In the first invention, when the ejector plate is raised from the mold closed state, the first and second ejector pins are projected to release the molded product from the mold. At that time, the slide cam is slid by the inclined pin. And just before the ejector plate's protrusion amount reaches the maximum,
The step portion of the second ejector pin contacts the core plate to restrict the protrusion of the second ejector pin, and at the same time, the contact between the collar portion and the horizontal surface of the slide cam slides to the slanted slide surface, Only the first ejector pin is ejected, and the mold opening is completed with a protrusion difference from the second ejector pin (FIGS. 1 and 2).

That is, in the mold open state, a protrusion difference occurs in the first and second ejector pins by the height a of the slide surface of the slide cam, and the cylindrical portion of the molded product is at the upper end of the second ejector pin. It will be held in a slightly floating state after being separated by c dimension from.

In the second invention, when the first ejector plate is lifted from the mold closed state, the first and second ejector pins are projected and brought into contact with the second ejector plate, so that both plates ascend. Immediately before the amount of protrusion reaches the maximum, the ejector stopper abuts the core plate, and the protrusion of the second ejector pin is restricted by the spring and the step.

On the other hand, since the slide cam slides in the same manner as described above, the collar portion slides on the horizontal plane and the sliding surface to cause a protrusion difference between the first and second ejector pins, thus ending the mold opening ( 3 and 4).

According to the device of the second invention, since the step portion contacts the core plate through the spring and the ejector stopper during the ejecting operation, the impact generated on the second ejector pin is alleviated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes an ejector restriction mechanism, which has a first ejector pin 6 fixed to an upper plate 30a of the ejector plate 30 and a second ejector pin 7 penetrating the upper plate 30a slidably.

A space 32 is provided in the lower plate 30b of the ejector plate 30, and the slide cam 5 is accommodated in the space 32 so as to be horizontally movable.

The slide cam 5 has an inclined slide surface 51 and a horizontal surface 53 formed on the upper surface of one end thereof, and a cavity 52 is provided therein.

Reference numeral 11 denotes an inclined pin fixed to the mounting board 4, which slidably penetrates the slide cam 5.

The second ejector pin 7 is provided with a collar portion 9 and a pressure receiving portion 10 having a diameter smaller than that on the base end side thereof, and the total length of the collar portion 9 and the pressure receiving portion 10 is the lower plate 30b. The thickness is substantially the same as the thickness of the.

The pressure receiving portion 10 is the slide cam 5
Of the pressure receiving portion 10 is in contact with the upper surface of the mounting plate 4 and a part of the lower surface of the collar portion 9 is in contact with the horizontal surface 53 when the mold is closed. There is.

A step portion 8 having a diameter larger than that of the pin body portion is formed above the collar portion 9, and a small diameter portion 7a having a diameter smaller than that of the pin body portion is provided at the upper end.

Reference numeral 2 is a core plate, 22 is a cavity plate, and a molded product 12 is formed by these two plates 2, 22. In addition, 13 is a small diameter portion 7 of the ejector pin 7.
It is a cylindrical portion molded on the outside of a.

Next, the operation of the mold releasing apparatus will be described. When the mold is opened by the mold opening mechanism from the mold closed state of FIG. 1 and the ejector plate 30 rises, the first and second ejector pins 6 and 7 are projected to release the molded product 12.

At this time, the slide cam 5 is slid to the right in FIG. 1 by the inclined pin 11. Immediately before the protrusion amount of the ejector plate 30 reaches the maximum, the stepped portion 8 of the second ejector pin 7 is moved to the core plate 2
The protrusion of the second ejector pin 7 is regulated by contacting with, and at the same time, the collar portion 9 slides from the contact with the horizontal surface 53 of the slide cam 5 to the inclined slide surface 51. During that time, only the first ejector pin 6 is projected and the mold opening is completed (FIG. 2).

That is, in the mold open state, a protrusion difference b occurs between the first and second ejector pins 6 and 7 by the height a of the slide surface 51 of the slide cam 5, and the upper end portion of the second ejector pin 7 is molded. The cylindrical portion 13 of the article 12 is the pin 7
The dimension c is extracted from the small diameter portion 7a and is held in a slightly floating state.

Therefore, the hugging of the cylindrical portion 13 due to the resin cooling is eliminated and the second portion remaining in the cylindrical portion 13 is eliminated.
The small diameter portion 7a of the ejector pin 7 prevents the molded product 12 from falling and is held so that it can be easily taken out.

In FIG. 2, there is a relationship of a = b = c. Further, since the pressure receiving portion 10 is provided, the dimensional accuracy of the collar portion 9 and the step portion 8 can be slightly roughened.

In the mold closing operation, when the ejector plate 30 is pushed back by the mold closing mechanism, the slide cam 5
Slides in the opposite direction by the inclined pin 11 and the horizontal surface 53 fixes the collar portion 9 to recover the difference in protrusion between the first and second ejector pins 6 and 7 (FIG. 1).

Next, an embodiment of the second invention will be described with reference to FIGS. The second device is different from the first device in that the second ejector plate 20 is provided.

That is, in the mold closed state of FIG. 3, the second ejector plate 20 is arranged at a predetermined distance d from the first ejector plate 30, and the sleeve 17 is slidable in the axial direction on the upper plate 20a thereof. The sleeve 17 is fitted with a flanged ejector stopper 14 biased upward by a spring 15 so as to be slidable in the axial direction. Then, the second ejector pin 7 penetrates the ejector stopper 14 and the spring retainer 16.

When the mold is opened by the mold opening mechanism from the mold closed state of FIG. 3 and the first ejector plate 30 rises,
While projecting the first and second ejector pins 6 and 7, they come into contact with the second ejector plate 20 and
Both 0 and 20 rise. Immediately before the amount of protrusion reaches the maximum, the ejector stopper 14 contacts the core plate 2, the protrusion of the second ejector pin 7 is regulated by the step 8 via the spring 15.

On the other hand, since the slide cam 5 slides to the left in the same manner as described above during that time, the collar portion 9 has the horizontal surface 53.
Then, the sliding surface 51 is slid to cause a protrusion difference b between the first and second ejector pins 6 and 7 to end the mold opening (FIG. 4).

In FIGS. 3 and 4, a = b = c =
There is a relationship of f = g = h and d ≧ e + f.

According to the device of the second invention, in addition to the same effect as the first invention, the step portion 8 has the spring 1 when the ejecting operation is performed.
The core plate 2 is abutted via the ejector stopper 5 and the ejector stopper 14, so that the impact is alleviated and the dimensional accuracy of the stepped portion 8 and the collar portion 9 can be made rougher than in the first invention.

If there is no room in the thickness of the upper plate 20a of the second ejector plate 20 as in this embodiment, the spring 15 can be a disc spring, and as shown in FIG. If there is enough space, it can be simplified by using a coil spring.

[0035]

Since the present invention is constructed as described above, it has the following effects. During the releasing operation, the molded product is held in a state of being floated from the mold so as not to drop, so that the hugging can be eliminated and the product can be easily taken out, and in particular, automatic taking out by a robot or the like becomes reliable.

Further, since the structure is simple, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the first invention when a mold is closed.

FIG. 2 is a sectional view of the same when the mold is opened.

FIG. 3 is a sectional view of an embodiment of the second invention when the mold is closed.

FIG. 4 is a sectional view of the same when the mold is opened.

FIG. 5 is a cross-sectional view of a main part showing the other embodiment.

FIG. 6 is a sectional view of the mold, which is partially omitted.

[Explanation of symbols] 1 ejector regulation mechanism 2 core plate 4 mounting board 5 slide cam 6 first ejector pin 7 second ejector pin 8 step 9 collar 11 tilting pin 14 ejector stopper 15 spring 20 second ejector plate 20a upper plate 20b Lower plate 30 (1st) Ejector plate 30a Upper plate 30b Lower plate 51 Sliding surface 53 Horizontal surface

Claims (2)

[Scope of utility model registration request] 1. A first member fixed to an ejector plate.
A second ejector pin that slidably penetrates the ejector pin and the upper plate of the ejector plate and is provided with a step portion and a flange portion, and is slidably accommodated in the lower plate of the ejector plate, and the flange portion abuts on the upper surface at one end. A slide cam having a horizontal surface and an inclined slide surface continuously provided, and an inclined pin fixed to a mounting plate and slidably penetrating the slide cam, and the step portion of the second ejector pin is a core plate when the mold opening operation is performed. And a slide cam slides by an inclined pin so that the collar portion slides on the slide surface to cause a protrusion difference between the first ejector pin and the second ejector pin. Release device. 2. A first ejector pin fixed to the first ejector plate, a second ejector pin slidably penetrating the upper plate of the ejector plate, and provided with a step portion and a flange portion, and below the first ejector plate. A slide cam that is slidably accommodated in the plate and has one end upper surface in which a horizontal plane on which the collar portion abuts and an inclined slide surface are continuously provided; and an inclined pin that is fixed to a mounting plate and slidably penetrates the slide cam. A second ejector plate which is arranged at a predetermined distance from the first ejector plate and through which the first and second ejector pins slidably pass,
An ejector stopper fitted in the upper plate of the second ejector plate so that the second ejector pin is slidable and is protruded by a spring from the upper plate by a predetermined dimension, and is externally fitted; The step portion of the second ejector pin abuts the core plate via the spring and the ejector stopper, and the slide cam slides by the inclined pin so that the collar portion slides on the slide surface, so that the first ejector pin and the second ejector A mold releasing device for an injection molding die, characterized in that a protrusion difference is generated between the pin and the pin.