JPH11245235A - Method for molding resin product and mold for molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for molding a resin product wherein an inserting member can be surely positioned when this inserting member is mounted in the mold clamping direction and a mold for molding in the mold for molding the resin product by using a pair of molds and a slide mold crossing with the mold clamping direction. SOLUTION: In a method for molding wherein after a cavity is formed by a pair of molds 23 movable in the mold clamping direction and a slide mold 6 movable in the direction intersecting the mold clamping direction by the mold clamping movement of a pair of these molds, a molten resin is filled into this cavity to mold a resin product, after butting of a pair of the molds is completed, the slide mold 6 is moved to form the cavity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of molds movable in a mold clamping direction, and a slide mold movable in a direction intersecting the mold clamping direction by the clamping operation of the pair of molds. The present invention relates to a molding method and a molding die in which a molten resin is filled into the cavity to form a resin product after the cavity is formed by the method.

[0002]

2. Description of the Related Art Conventionally, as a mold for molding a resin product of this type, a mold having a structure shown in FIGS. 7 to 10 is known.

[0003] A molding die indicated by reference numeral 1 in these figures is:
This is a vertical molding die whose opening / closing direction coincides with the vertical direction, and is relatively moved in a mold clamping direction (up-down direction) with respect to the fixed die 2 installed below. A movable mold 3, a movable plate 4 on which the movable mold 3 is mounted so as to be relatively movable in the mold clamping direction, and a movable plate 3 and the movable mold 3, which are relatively movable in the mold clamping direction. A runner stripper plate 5 movably mounted, a pair of slide dies 6 movable in a direction intersecting the mold clamping direction of the two dies 2, 3; A schematic configuration including an angular pin 7 that is slidably engaged with the slide mold 6 to convert the movement of the movable mold 3 in the mold closing direction into the movement of the slide mold 6; Has become.

The two slide dies 6 are fixed to the fixed dies 2.
A concave portion 6a is formed slidably on the upper surface and forms a cavity C in cooperation with the fixed mold 2 and the movable mold 3 on these opposing surfaces.

Further, the angular pins 7 are provided for each of the slide dies 6, and the angular pins 7 are separated such that their distal ends move forward in the mold clamping direction. It is inclined in the shape of "C".

Further, a locking projection 8 on which an insert member W integrated with a resin product is mounted is provided at a portion of the fixed mold 2 where the cavity C is formed.

On the other hand, guide pins 9 and 10 slidably fitted to the movable mold 3 and the runner stripper plate 5 are attached to the movable plate 4. At the tip (lower end)
A locking step 9a for regulating the maximum separation distance between the movable plate 4 and the movable mold 3 is formed. In the middle of the guide pin 10, the maximum distance between the movable plate 4 and the runner stripper plate 5 is set. A locking step 10a for regulating the separation distance is formed.

The fixed mold 2 is fixed to the molding machine main body, and the movable plate 4 is fixed to a mold clamping cylinder constituting the molding machine. The movable plate 4 is fixed by the mold clamping cylinder. By being moved toward and away from the fixed mold 2, mold clamping and mold opening are performed.

[0009] The conventional molding die 1 constructed as described above.
To explain the operation of (1), first, as shown in FIG.
The movable plate 4 is separated from the fixed mold 2 by a maximum distance to open the mold, the upper part of the fixed mold 2 is largely opened, and the two slide dies 6 are largely separated from each other. After the insert member W is mounted on the locking projection 8 provided on the second mold 2, the movable plate 4 is moved toward the fixed mold 2 to start the mold clamping operation.

When such a mold clamping operation is started, the movable mold 3 and the runner stripper plate 5 start descending together with the movable plate 4 by their own weight. At this time, the movable plate 4, the runner stripper plate 5, and the movable mold 3 are lowered while maintaining an interval therebetween, and their positional relationship is, as shown in FIG. 3 is maintained until it comes into contact with the slide mold 6.

[0011] Then, with the lowering operation of the movable mold 3, the angular pins 7 attached to the movable mold 3 are similarly lowered, so that the angular pins 7 are tilted. The two slide molds 6 into which the angular pins 7 are inserted are moved in synchronization with the movement of the movable mold 3 so as to approach each other, and as shown in FIG. At the same time that the movable mold 3 is brought into contact with the slide mold 6 or the fixed mold 2, the two slide molds 6 are positioned at predetermined positions.

Thus, the cavity C is formed by the fixed mold 2, the movable mold 3, and the two slide molds 6 so as to surround the insert member W.

Further, when the movable plate 4 continues to descend, the movable mold 3 is prevented from descending, so that the movable plate 4 and the runner stripper plate 5 maintain the distance therebetween, and The movable mold 3 is relatively moved toward the movable mold 3 in a state, and the runner stripper plate 5 is brought into contact with the movable mold 3 as shown in FIG.
Then, the movable plate 4 is stopped by being brought into contact with the runner stripper plate 5 as shown in FIG.

As a result, a predetermined pressure is applied to the movable plate 4 by the mold clamping cylinder to complete the mold clamping, and the cavity C is filled with the molten resin. The product is molded.

When the molding is completed, the movable plate 4 is moved in the opposite direction to perform the mold opening operation. The operations of the movable plate 4, the runner stripper plate 5, and the movable mold 3 are performed as follows. The operation is the reverse of that during mold clamping.

[0016]

However, such a conventional molding die 1 has the following problems to be improved.

That is, since the movable mold 3 and the slide mold 6 are synchronously moved by the angular pins 7, the closing of the movable mold 3 and the fixed mold 2 is completed, and both slides are completed. For example, if the insert member W is attached to the locking projection 8 in a state of being shifted, such as inclining or floating, the insert member W is closed. W is movable mold 3
Before the pressing and the correction of the posture or the position, the mold clamping of the two slide dies 6 is performed. As a result, the insert member W in the resin product is displaced, or the insert member W is displaced. The insert member W or the slide mold 6 is damaged due to being bitten by the slide mold 6.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above problem. It is an object of the present invention to provide a method of molding a resin product and a molding die capable of reliably positioning the insert member when the member is mounted.

[0019]

According to a first aspect of the present invention, there is provided a resin product molding method comprising: a pair of molds movable in a mold clamping direction; Forming a cavity by a slide mold movable in a direction intersecting with the mold clamping direction by the mold clamping operation of the mold, and then filling the cavity with a molten resin to mold a resin product. The method is characterized in that after the butting of the pair of molds is completed, the slide mold is moved to form the cavity.

According to a second aspect of the present invention, in the method for molding a resin product according to the first aspect, after the insert member is mounted on one of the pair of molds, the other mold is applied to the insert member. It is characterized in that the insert member is positioned by abutting against the one mold while being in contact with the mold.

According to a third aspect of the present invention, in the method for molding a resin product according to the first or second aspect, after the insert member is attached to one of the pair of molds, the other mold is attached to the mold. It is characterized in that the insert member is compressed and deformed by being brought into contact with the one mold while being in contact with the insert member.

According to a fourth aspect of the present invention, there is provided a resin product molding mold, a fixed mold, a movable mold relatively movable in a mold clamping direction with respect to the fixed mold, and a movable mold. A movable plate mounted so as to be relatively movable in a mold clamping direction, a runner stripper plate mounted so as to be relatively movable in a mold clamping direction between the movable plate and the movable mold, A slide mold movably provided in a direction intersecting with the mold clamping direction, and the movable plate or runner stripper attached to the movable plate or runner stripper plate and disengaged from the slide mold. An angular pin for moving the slide mold by the movement of the plate, and in the mold open state, the tip of the angular pin, Is characterized by its length serial than butting surfaces of the movable mold so as to be positioned on the movable plate side is set.

According to a fifth aspect of the present invention, there is provided a resin product molding die according to the fourth aspect, wherein the resin product is formed between the movable plate and the movable die or between the runner stripper plate and the movable die. Between them, there is provided a resilient member for repelling them in a direction away from each other.

Further, the mold for molding a resin product according to claim 6 of the present invention is the mold according to claim 4, wherein the mold is between the movable mold and the fixed mold, or the movable mold and the slide mold. And a suction means for holding them in a contact state for a predetermined period of the mold opening operation.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, portions common to those in FIGS. 7 to 10 will be simplified by using the same reference numerals.

In FIG. 1 to FIG. 4, reference numeral 20 indicates a mold for molding a resin product according to the present embodiment.
A movable mold 3 capable of moving relative to the fixed mold 2 in a mold clamping direction (vertical direction); a movable plate 4 on which the movable mold 3 is relatively movable in the mold clamping direction; A runner stripper plate 5 mounted between the plate 4 and the movable mold 3 so as to be relatively movable in the mold clamping direction, and a pair of movable strippers 5 movable in a direction intersecting the mold clamping direction of the two molds 2 and 3; The slide die 6 is attached to a lower portion of the runner stripper plate 5 and is attached to and detached from the slide die 6, so that the slide die 6 is moved by the movement of the runner stripper plate 5. The movable pin 3 is located closer to the movable plate 4 than the butting surface 3a of the movable mold 3 in the mold open state. Its length is a set schematic configuration so that.

More specifically, the movable mold 3 includes:
When the relative movement with the runner stripper plate 5 is performed, the elongated hole 2 that allows the passage of the angular pin 21 mounted on the runner stripper plate 5 is allowed.
2 are formed along the moving direction of the slide die 6.

As shown in FIG. 1, when the runner stripper plate 5 is farthest from the movable mold 3, each of the angular pins 21 has the movable tip. The length is set so as not to protrude from the butting surface 3 a of the mold 3.

Further, each of the slide dies 6 has the same inclination as the angular pin 21 and a guide hole 23 into which the angular pin 21 is slidably fitted.
Are formed.

The movable mold 3, the runner stripper plate 5, and the guide pins 9 and 10 for connecting the movable plate 4 so as to be relatively movable have the same shape as that of FIG. The mold 3, the runner stripper plate 5, and the movable plate 4 are allowed to move relative to each other until they come into contact with each other, and are held at predetermined intervals in the mold open state.

Next, the method of molding a resin product of the present invention will be described together with the operation of the molding die 20 according to the present embodiment configured as described above.

First, as shown in FIG.
Is opened, and the space between the movable mold 3 and the fixed mold 2 is largely opened. In such a mold open state, the two slide molds 6 are moved to a predetermined position and held in an open state, and the movable mold 3 and the runner stripper plate 5 are lowered by their own weights, and Although separated from the movable plate 4, these are held at a predetermined interval by the action of the guide pins 9 and 10.

Next, after the insert member W is mounted on the locking projection 8 and the movable plate 4 is lowered to start the mold clamping operation, the movable mold 3 and the runner stripper plate 5 are moved by the movable plate 4. 4 while maintaining the distance from the movable plate 4
Start descent with it.

When such a mold clamping operation is continuously performed, as shown in FIG. 2, the movable mold 3 is brought into contact with the slide mold 6 or the fixed mold 2 located thereunder. Stops the movement. At this time,
If the insert member W attached to the locking projection 8 has a deviation in posture such as inclination or lifting, the insert member W is inserted before the movable mold 3 comes into contact with the fixed mold 2 or the slide mold 6. To be in contact with W,
The tip of the angular pin 21 is
Since the two slide dies 6 are not fitted to each other and are not engaged with each other, the two slide dies 6 are held at the open position and separated from the insert member W. The insert member W is pressed toward the fixed mold 2 by the movable mold 3 to correct a posture shift such as an inclination or a floating of the insert member W, and in the present embodiment, the insert member W is movable. By being pressed by the mold 3, it is positioned at a predetermined position of the fixed mold 2.

When the mold clamping operation is further continued,
The runner stripper plate 5 and the movable plate 4 are lowered, but since the movable mold 3 is in a stopped state, each of the angular pins 21 of the runner stripper plate 5 is protruded below the movable mold 3. By being moved and fitted into each guide hole 23 of each slide mold 6 positioned below the movable mold 3, each slide mold 6 is inclined by the inclination of the angular pin 21. Are moved toward each other.

As shown in FIG. 3, the movement of the slide dies 6 is stopped when the runner stripper plate 5 comes into contact with the movable die 3, and in this stopped state, each slide die 6 is moved. The formed recess 6a
Are positioned so as to surround the insert member W, so that the cavity 6 is formed by the concave portion 6a, the movable mold 3 and the fixed mold 2.

At the time of the closing operation of the slide die 6, since the posture correction and positioning of the insert member W mounted on the locking projection 8 are performed, the insert member W and both slides are The occurrence of galling with the mold 6 is prevented, and as a result, the insert member W
The slide die 6 is prevented from being damaged.

The movable plate 4 continues to descend even after the movement of the runner stripper plate 5 is stopped. As shown in FIG. 4, the movable plate 4 stops descending by contact with the runner stripper plate 5, and
It is pressed against the runner stripper plate 5 at a predetermined pressure.

As a result, the mold clamping is completed, and the resin is filled into the cavity C formed in the mold, thereby forming a resin product.

After completion of the molding, the mold is opened to take out the resin product. The relative positions of the slide mold 6, the movable mold 3, the runner stripper plate 5, and the movable plate 4 at the time of the mold opening are determined. Movement is
The movement is opposite to the movement at the time of the mold clamping described above.

When the state shown in FIG. 3 shifts to the state shown in FIG. 2, the runner stripper plate 5 is moved in the mold opening direction while the movable mold 3 is fixed. Due to the relative movement between the mold 3 and the runner stripper plate 5, the gate cut, the release of the runner, and the like are reliably performed.

As described above, according to the molding die 20 and the molding method according to the present embodiment, when molding a resin product using the insert member W, the positioning and posture correction of the insert member W are reliably performed. At the same time, galling between the insert member W and the slide mold 6 is prevented,
These damages are prevented.

Furthermore, the angular pin 21 for driving the opening and closing of the slide die 6 is short, and the amount of opening of the die can be reduced. As a result, the size of the die can be reduced. And the molding efficiency is increased, and the molding cost is reduced.

In the above-described embodiment, an example has been described in which the posture correction and positioning are performed by pressing the insert member W with the movable mold 3 at the time of mold clamping, but the shape of the cavity C is adjusted. Thereby, the movable member 3 can compress and deform the insert member W.

By adopting such a structure, the insert member W is adapted to the inner surface of the cavity C to suppress the occurrence of burrs or the like, or when a multilayer insert member W is used, The mutual contact of the insert members W is ensured, the dimensional variation in the stacking direction is eliminated, and the positioning is ensured.

Next, a second embodiment of the molding die of the present invention will be described with reference to FIG. In this figure, a molding die indicated by reference numeral 30 is elastic between the movable die 3 and the runner stripper plate 5 and between the runner stripper plate 5 and the movable plate 4 in a direction to separate them from each other. The present embodiment is characterized in that a resilient member (a coil spring in the illustrated example) 31 is interposed, and the other configuration is the same as that of the above-described embodiment.

With such a configuration, the relative movement order of the movable mold 3, the runner stripper plate 5, and the movable plate 4 when opening and closing the mold is ensured, and thereby, when the mold is opened. With the movable mold 3 fixed, the runner stripper plate 5 is securely separated from the movable mold 3.

Therefore, the gate cut and the release of the runner are reliably performed. And the elastic member 31
The same function may be obtained by interposing between the movable mold 3 and the movable plate 4, or by providing only between the movable mold 3 and the runner stripper plate 5.

FIG. 6 shows a molding die according to a third embodiment of the present invention. The molding die indicated by reference numeral 40 in this figure is the movable die of the slide die 6. It is characterized in that a suction means (magnet in the illustrated example) for holding these parts in contact with each other when the molds are opened is provided at the contact portion with the mold 3, and the other configuration is the same as that of the first embodiment. is there. With such a configuration, a function similar to that of the above-described second embodiment can be obtained.

As the suction means, a permanent magnet, an electromagnet, a magnet chuck, a vacuum suction device, or the like can be used, and the installation position may be a fixed mold.

The shapes, dimensions, and the like of the components shown in the above embodiments are merely examples, and can be variously changed based on design requirements and the like.

[0052]

As described above, according to the first aspect of the present invention,
According to the resin product molding method described in the above, by performing the mold clamping of the slide mold after performing the mold clamping of the pair of molds, when molding the resin product using an insert member, When the mold is clamped, the insert is first sandwiched between the two molds, thereby preventing the insert member from being tilted or raised, and correcting the deviation of the posture. This makes it possible to mold a high-quality resin product by setting the insert member in the resin product as a design position, and to prevent galling of the insert member at the time of mold clamping of the slide die, and to prevent the insert member from seizing. Damage can be prevented, and from this point, a high-quality resin product can be formed.

According to the method of molding a resin product according to the second aspect of the present invention, when the two molds are clamped, the insert member mounted on one mold is pressed by the other mold. This insert member can be moved to a predetermined position of one of the molds, and from this point, a high-quality resin product can be molded.

According to the resin product molding method of the third aspect of the present invention, when the two molds are clamped, the insert members are compressed and deformed in the mounting direction by the two molds. Can be applied to the inner surface of the cavity of the mold, the occurrence of burrs and the like can be prevented, the quality can be improved, and the dimensional variation of the insert member in the mold clamping direction can be suppressed.

In particular, when the insert members are laminated in a multilayered manner in the mold clamping direction, the insert members can be surely brought into contact with each other, and they can be positioned with high accuracy. A resin product can be obtained.

According to the resin product molding die of the fourth aspect of the present invention, the angular pin is provided on the movable plate or the runner stripper plate,
The tip of the angular pin is located closer to the movable plate than the butting surface of the movable mold, so that the molding method according to claims 1 to 3 can be effectively performed, The angular pin can be shortened to reduce the opening amount of the mold. As a result, not only the size of the mold can be reduced, but also the molding cycle can be shortened and the molding cost can be reduced.

According to the resin product molding die of the fifth aspect of the present invention, the distance between the movable plate and the movable die, or between the runner stripper plate and the movable die, Providing a resilient member for repelling these components in a direction away from each other allows the mold opening / closing operation of the molding die according to claim 4 to be reliably performed, and secures the fixing metal when the mold is opened. Prior to opening the mold and the movable mold, the runner stripper plate can be surely opened, so that the gate cut and the release of the runner can be reliably performed.

The movable plate, the runner stripper plate, and the movable die are forcibly moved by a resilient member so that the mold is opened and closed in a horizontal direction in which no own weight acts in the mold opening and closing direction. Molding die.

Further, according to the resin product molding die of the present invention, between the movable die and the fixed die, or between the movable die and the slide die. To
By providing suction means for holding these in a contact state for a predetermined period of the mold opening operation, at the time of mold opening, it is possible to reliably open the runner stripper plate prior to the mold opening of the fixed mold and the movable mold. Can do this,
Gate cutting and mold release of the runner can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a molding die according to a first embodiment of the present invention, showing a mold open state.

FIG. 2 is a partially cutaway front view showing the molding die according to the first embodiment of the present invention, showing a state in which the mold is being clamped.

FIG. 3 is a partially cutaway front view showing the molding die according to the first embodiment of the present invention, showing a state in which the mold is being clamped.

FIG. 4 is a partially cutaway front view showing a molding die according to the first embodiment of the present invention, showing a completed state of mold clamping.

FIG. 5 is a partially cutaway front view showing a molding die according to a second embodiment of the present invention.

FIG. 6 is a partially cutaway front view showing a molding die according to a third embodiment of the present invention.

FIG. 7 is a partially cutaway front view showing a conventional molding die, showing a mold open state.

FIG. 8 is a partially cutaway front view showing a conventional molding die, showing a state in which the mold is being clamped.

FIG. 9 is a partially cutaway front view showing a conventional molding die, showing a state in the middle of mold clamping.

FIG. 10 is a partially cutaway front view showing a conventional molding die, showing a state in which mold clamping is completed.

[Explanation of symbols]

 2 Fixed mold 3 Movable mold 3a Butting surface 4 Movable plate 5 Runner stripper plate 6 Slide mold 20 ・ 30 ・ 40 Molding mold 21 Angular pin 31 Resilient member 41 Suction means

Claims (6)

[Claims] A pair of molds movable in a mold clamping direction.
After forming a cavity C by a mold 3 and a slide mold 6 movable in a direction intersecting the mold clamping direction by the mold clamping operation of the pair of molds 2 and 3, the molten resin is poured into the cavity C. In a molding method for filling and molding a resin product, the slide mold 6 is moved to form the cavity C after the butting of the pair of molds 2 and 3 is completed. Molding method for resin products. 2. After the insert member W is mounted on one of the pair of molds 2 and 3, the other mold 3 is abutted against the one mold 2 while being in contact with the insert member W. The method for molding a resin product according to claim 1, wherein the positioning of the insert member (W) is performed by the following. 3. After the insert member W is mounted on one of the pair of molds 2 and 3, the other mold 3 is abutted against the one mold 2 while being in contact with the insert member W. The method according to claim 1, wherein the insert member is compressed and deformed. 4. A fixed mold 2, a movable mold 3 relatively movable in the mold clamping direction with respect to the fixed mold 2, and the movable mold 3 is mounted so as to be relatively movable in the mold clamping direction. A movable plate 4, a runner stripper plate 5 mounted between the movable plate 4 and the movable mold 3 so as to be relatively movable in a mold clamping direction set as required, and the two dies 2.3 By being attached to the movable plate 4 or the runner stripper plate 5 and being disengaged from the slide mold 6, the slide mold 6 is provided so as to be movable in a direction intersecting the mold clamping direction.
And an angular pin 21 for moving the slide die 6 by the movement of the movable plate 4 or the runner stripper plate 5.
A mold for molding a resin product, wherein the length of the angular pin 21 is set such that the tip of the angular pin 21 is located closer to the movable plate 4 than the butted surface 3a of the movable mold 3. 5. A resilient member 31 for resiliently moving the movable plate 4 and the movable mold 3 or between the runner stripper plate 5 and the movable mold 3 in a direction away from each other. The mold for molding a resin product according to claim 4, wherein the mold is provided. 6. Attraction between the movable mold 3 and the fixed mold 2 or between the movable mold 3 and the slide mold 6 for keeping them in contact for a predetermined period of the mold opening operation. The mold for molding a resin product according to claim 4, wherein a means (41) is provided.