JP2020104437A - Injection molding equipment and methods for injection molding - Google Patents

Abstract

To perform efficient injection molding of injection molding equipment even large workpiece with complex undercut geometries.SOLUTION: In the injection molding machine 10 and the injection molding method, after separating the second molding mold 26 relative to the first molding mold 24, the first inserts 28 and 30 and the second inserts 32 to 36 are moved in the A2 direction with the workpiece 12. Next, the first cavity 30 is moved in the protruding direction of the protruding portion 20, making the first cavity 28 and the second cavity 32 to 36, other than the first cavity 30, separable, while the second cavity 36 is moved by the cavity movement mechanism 42 in another direction different from the protruding direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to an injection molding apparatus and an injection molding apparatus for injection molding a work having a projecting portion projecting in one direction with respect to the work body and an undercut portion formed in a direction different from the projecting direction of the projecting portion with respect to the work body. It relates to a molding method.

For example, Patent Document 1 discloses a die structure for releasing a work having an undercut portion.

JP, 2000-225621, A

However, in Patent Document 1, there is no insert for releasing the work from the mold body. Therefore, it is difficult to apply the technique of Patent Document 1 to an injection molding device that injection-molds a large work having a complicated undercut shape.

The present invention has been made in view of the above problems, and provides an injection molding apparatus and an injection molding method capable of efficiently performing injection molding even for a large work having a complicated undercut shape. The purpose is to provide.

An aspect of the present invention is an injection molding for injection molding a work having a projecting portion that projects in one direction with respect to the work body and an undercut portion that is formed in a direction different from the projecting direction of the projecting portion with respect to the work body. The present invention relates to a molding device and an injection molding method.

The injection molding apparatus includes a first molding die, a second molding die, a plurality of inserts, a work extruding mechanism, and an insert moving mechanism. The plurality of inserts are arranged so as to be separable between the first mold and the second mold, and form a cavity for molding the work together with the first mold and the second mold. To do. The work pushing mechanism moves the plurality of inserts together with the work in a releasing direction in a state where the second molding die is relatively separated from the first molding die. Of the plurality of nests, the nest moving mechanism moves a first nest forming the projecting portion in the projecting direction so that nests other than the first nest can be separated. On the other hand, at least one second insert other than the first insert is movable in another direction.

In the injection molding method, first, by arranging a plurality of inserts between the first mold and the second mold in a separable manner, the plurality of inserts, the first mold and the second mold are formed. The mold forms a cavity. Next, after injection-molding the work in the cavity, the second mold is relatively separated from the first mold. Next, the work pushing mechanism moves the plurality of inserts together with the work in the releasing direction. Next, of the plurality of inserts, the first insert that forms the protruding portion is moved in the protruding direction by the insert moving mechanism so that the inserts other than the first insert are in a separable state. On the other hand, at least one second insert other than the first insert is moved in the other direction by the insert moving mechanism.

According to the present invention, the second insert can be moved in another direction (for example, another direction that is the forming direction of the undercut portion) with respect to the moving direction (projection direction) of the first insert. Thereby, a large-sized work having an undercut can be easily taken out after the injection molding. Therefore, even a large work having a complicated undercut shape can be efficiently injection-molded.

It is a front view of the work injection-molded by the injection molding device concerning this embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. 1. It is sectional drawing which shows the mold structure of the injection molding apparatus which concerns on this embodiment. It is a side view of the injection molding apparatus of FIG. It is a typical block diagram which showed a part of injection molding apparatus of FIG. It is a front view of the injection molding apparatus of FIG. It is explanatory drawing which showed operation|movement (injection molding method) of the injection molding apparatus of FIG. It is explanatory drawing which showed operation|movement of the injection molding apparatus of FIG. It is explanatory drawing which showed operation|movement of the injection molding apparatus of FIG. It is explanatory drawing which showed operation|movement of the injection molding apparatus of FIG. It is explanatory drawing which showed operation|movement of the injection molding apparatus of FIG. It is explanatory drawing which showed operation|movement of the injection molding apparatus of FIG.

Hereinafter, preferred embodiments of an injection molding apparatus and an injection molding method according to the present invention will be illustrated and described with reference to the accompanying drawings.

[1. Configuration of this embodiment]
1 and 2 show a work 12 which is a molded product injection-molded by an injection molding apparatus 10 (see FIGS. 3 to 12) according to this embodiment. Here, the work 12 will be described prior to the description of the injection molding apparatus 10.

<1.1 Outline of work 12>
The work 12 is, for example, an instrument panel of a four-wheeled vehicle, and a work body 14 that is a main body portion is provided with a chute 16 of an airbag as an SRS (Supplemental Restraint System). On one surface 18 of the work body 14, which is the back surface of the instrument panel, a frame-shaped projecting portion 20 forming the chute 16 is formed to project in one direction. In FIG. 2, the projecting portion 20 (projecting portions 20a, 20b) is formed so as to project from the one surface 18 of the work body 14 with the projecting direction being the diagonally lower left direction on the paper surface. Further, undercut portions 22 (undercut portions 22a, 22b) are formed in the projecting portion 20 in another direction intersecting the projecting direction (for example, a direction along the one surface 18 of the work body 14).

<1.2 Mold Structure of Injection Molding Device 10>
The injection molding apparatus 10 according to the present embodiment is an apparatus for injection molding a work 12 having such a work body 14, protrusions 20 (20a, 20b) and undercut portions 22 (22a, 22b). 3, as shown in FIG. 3, a first molding die 24, a second molding die 26, and a plurality of nests (first molding die 24 that are separably disposed between the first molding die 24 and the second molding die 26). The inserts 28 and 30, and the second inserts 32 to 36). A cavity 38 for molding the work 12 is formed by the gap between the first molding die 24, the second molding die 26, the first inserts 28 and 30, and the second inserts 32 to 36.

In the injection molding device 10, the second molding die 26 moves relative to the first molding die 24 in the A direction. Specifically, in the present embodiment, the second molding die 26 is a movable mold with respect to the first molding die 24, and the A2 direction is the mold release direction. Of the plurality of inserts, the two inserts that form the protrusions 20a and 20b are the first inserts 28 and 30, and the three inserts other than the first inserts 28 and 30 are the second inserts 32. ~36. In the present embodiment, at least one each of the first inserts 28 and 30 and the second inserts 32 to 36 is sufficient.

The two first inserts 28 and 30 are movable in the protruding direction. Of the two first inserts 28 and 30, one first insert 28 is a insert for forming the protruding portion 20a closer to the A1 direction and the B1 direction in the cross-sectional view of FIG. Further, the other first insert 30 has a shape larger than that of the one first insert 28, the bottom surface contacts the first mold 24, and the surface is in the A2 direction and B1 in the cross-sectional view of FIG. It is formed in a substantially T shape protruding toward the direction.

Of the three second inserts 32 to 36, one large second insert 32 includes two first inserts 28 and 30, and two other small second inserts 34 and 36. Is disposed between the first molding die 24 and the second molding die 26 so as to surround the. Of the other two second inserts 34, 36, one second insert 34 is arranged close to the two first inserts 28, 30. The second insert 36 on the other side is arranged close to the first insert 30 on the other side.

<1.3 Drive Mechanism of Injection Molding Device 10>
Next, a drive mechanism for moving the first inserts 28, 30 and the second inserts 32 to 36 in the injection molding device 10 will be described with reference to FIGS. 4 to 6.

The injection molding apparatus 10 includes the first inserts 28 and 30, the second inserts 32 to 36, and the second inserts 32 to 36 in a state where the second mold 26 is relatively separated from the first mold 24 (see FIG. 3 ). By moving the work pushing mechanism 40 that moves the work 12 in the A2 direction and the first inserts 28 and 30 in the projecting direction, the second inserts 32 to 36 can be separated, and another direction different from the projecting direction. It further has a nest moving mechanism 42 capable of moving at least one second insert 36 in (for example, another direction along the one surface 18 of the work body 14).

As shown in FIGS. 4 and 5, the work pushing mechanism 40 is connected to a plurality of inserts, for example, a second insert 32 having a large shape, and a plurality of direct-pressing rods 44 extending in the A direction, It has a driving means (not shown) such as a cylinder for moving the direct pressing rod 44 of the book forward and backward in the A direction. Therefore, when the driving means advances the plurality of direct-pressing rods 44 in the A2 direction while the second molding die 26 is relatively separated from the first molding die 24, the work 12 and the first The nests 28, 30 and the second nests 32 to 36 can be integrally moved in the A2 direction.

As shown in FIGS. 4 to 6, the insert moving mechanism 42 moves the first inserts 28 and 30 (see FIG. 3) in the protruding direction (oblique direction on the paper surface of FIGS. 4 and 5). The driving force of the nest moving means 46 and the driving force of the first nest moving means 46 in the projecting direction of the first nests 28, 30 is directed to the other direction (another direction intersecting the projecting direction on the paper surface of FIG. 5). Second nest moving means 48 for converting the driving force to move at least one second nest 36 in the other direction. In addition, in FIG. 4 to FIG. 6, for simplification of description, some of the components are simplified or omitted.

The first insert moving means 46 includes a first moving part 50 for moving the large-shaped first insert 30 in the protruding direction and a second moving part 50 for moving the small-shaped first insert 28 in the protruding direction. And a moving unit 52.

The first moving unit 50 has a plate-like cylinder base 50a, a first cylinder drive source 50b attached to the cylinder base 50a, a first cylinder drive source 50b, a cylinder base 50a, and a protrusion direction. First cylinder rod 50c connected to the large first insert 30 and a plurality of first guide pins having one end connected to the cylinder base 50a and both sides of the large first insert 30 passing through the other end. 50d. In the first moving unit 50, when the first cylinder drive source 50b is driven to move the first cylinder rod 50c forward and backward, the first cylinder rod 50c is connected to the first cylinder rod 50c under the guiding action of the plurality of first guide pins 50d. The first insert 30 having a large shape can be moved in the protruding direction.

The second moving portion 52 extends to the second cylinder drive source 52a attached to the cylinder base 50a and the second cylinder drive source 52a in the projecting direction from the second cylinder drive source 52a through the cylinder base 50a to the small-sized first insert 28. The second cylinder rod 52b is connected to the second cylinder rod 52b. In the second moving portion 52, when the second cylinder drive source 52a is driven to move the second cylinder rod 52b forward and backward, the small first insert 28 having a shape connected to the second cylinder rod 52b is projected. Can be moved to.

The second insert moving means 48 has a function of moving at least one second insert 36 in the other direction and also a function of moving the two second inserts 34, 36 having a small shape in the projecting direction. There is. In order to realize these functions, the second nest moving means 48 has two third cylinder drive sources 48a attached to the cylinder base 50a and two third cylinder drive sources 48a extending in the protruding direction from the two third cylinder drive sources 48a. A cylinder plate 48c connected to the third cylinder rod 48b and two third cylinder rods 48b and extending substantially parallel to the cylinder base 50a, one end fixed to the cylinder plate 48c, and the other end penetrating the cylinder base 50a. And a plurality of second guide pins 48d extending in the protruding direction, and two rods 48e, 48f extending in the protruding direction from the cylinder plate 48c and connected to the two second inserts 34, 36.

One of the two rods 48e, 48f is fixed to the cylinder plate 48c at one end, extends through the cylinder base 50a in the protruding direction, and is connected at the other end to the second insert 34. ing. One end of the other rod 48f is connected to the slide unit 48g provided on the cylinder plate 48c, and extends diagonally through the cylinder base 50a in the protruding direction to thereby be provided on the large-sized first insert 30. The other end is connected to the second insert 36 via the guide bush 48h.

Therefore, in the second insert moving means 48, when the first insert 30 having a large shape is moved in the projecting direction by the first insert moving means 46, the rod 48f rotates with the guide bush 48h as a fulcrum. , One end of a rod 48f connected to the slide unit 48g slides. As a result, the second insert 36 connected to the rod 48f moves in the other direction intersecting the projecting direction. If the inclination angle of the rod 48f with respect to the projecting direction is θ and the moving amount (stroke) of the first insert 30 in the projecting direction is S, the displacement amount (sliding amount) of the second insert 36 in the other direction will be described. ) L becomes L=Stan θ.

Further, in the second nest moving means 48, when the two third cylinder drive sources 48a are driven to move the two third cylinder rods 48b forward and backward, the guiding action of the plurality of second guide pins 48d. The cylinder plate 48c connected to the two third cylinder rods 48b moves downward in the protruding direction. As a result, the two rods 48e and 48f connected to the cylinder plate 48c move forward and backward in the projecting direction, so that the two second inserts 34 and 36 connected to the two rods 48e and 48f move in the projecting direction. Can be made.

The configurations of the work pushing mechanism 40 and the nest moving mechanism 42 described above are examples, and if the first nests 28 and 30 and the second nests 32 to 36 can be moved as described above, the injection is performed. The molding apparatus 10 can employ any drive mechanism configuration.

[2. Operation of this embodiment]
Next, the operation (injection molding method) of the injection molding apparatus 10 according to the present embodiment will be described with reference to FIGS. 7 to 12. It should be noted that this operation description will be made with reference to FIGS. 1 to 6 as necessary. The operations of the work pushing mechanism 40 and the nest moving mechanism 42 have already been described with reference to FIGS. 4 to 6, so here, mainly, the first molding die 24, the second molding die 26, and the first nesting die. The operations of 28, 30 and the second inserts 32 to 36 will be described. Therefore, the operation of the work pushing mechanism 40 and the nest moving mechanism 42 may be simplified or may be omitted.

First, the first molding die 24, the second molding die 26, the first inserts 28 and 30, and the second inserts 32 to 36 are arranged as shown in FIGS. 3 and 7, and the cavity 38 is formed. In this state, the cavity 38 is filled with resin and the work 12 is injection-molded.

After the injection molding of the work 12, the second molding die 26 is relatively separated from the first molding die 24 in the A2 direction. Next, as shown by the arrows in FIG. 8, the first inserts 28, 30 and the second inserts 32 to 36 are driven by the plurality of direct-pressing rods 44 (see FIGS. 4 and 5) of the work pushing mechanism 40. And the work 12 is moved in the A2 direction.

Next, as shown by the arrow in FIG. 9, the first insert 30 having a large shape is moved to the first insert moving means 46 of the insert moving mechanism 42 (see FIGS. 4 to 6). The portion 50 moves (retracts) in the protruding direction. As a result, the first insert 28 and the second inserts 32 to 36 other than the first insert 30 are in a separable state. At that time, the second insert moving means 48 converts the driving force in the protruding direction of the first insert 30 into the driving force in the other direction. Thereby, one second insert 36 is slightly separated from the work 12 and is a space formed by retreating the first insert 30 along the other direction as shown by the arrow in FIG. 9. Move in.

Next, as shown by the arrow in FIG. 10, the first insert 28 having a small shape is removed from the work 12 by the second moving portion 52 (see FIGS. 4 and 5) forming the first insert moving means 46. Separate (retract) in the protruding direction.

Next, as shown by the arrow in FIG. 11, the work 12 is slightly moved in the A2 direction. As a result, the undercut portion 22 (see FIG. 2) is separated from the first inserts 28, 30 and the second inserts 32 to 36. In this case, for example, only the work 12 may be moved in the A2 direction by a moving mechanism (not shown).

Next, as shown by the arrow in FIG. 12, the two second inserts 34 and 36 are moved in the protruding direction by the second insert moving means 48 (see FIGS. 4 to 6). Accordingly, the two second inserts 34 and 36 are separated from the work 12 without interfering with each other. As a result, the work 12 can be easily taken out from the injection molding device 10.

[3. Effect of this embodiment]
As described above, the injection molding device 10 according to the present embodiment includes the first molding die 24, the second molding die 26, and a plurality of nests (first nests 28 and 30, second nests 32 to 36). A work pushing mechanism 40 and a nest moving mechanism 42 are provided. The first inserts 28 and 30 and the second inserts 32 to 36 are arranged so as to be separable between the first mold 24 and the second mold 26, and together with the first mold 24 and the second mold 26. A cavity 38 for forming the work 12 is formed. The work extrusion mechanism 40 moves the first inserts 28 and 30 and the second inserts 32 to 36 together with the work 12 in the A2 direction in a state where the second forming die 26 is relatively separated from the first forming die 24. Move in the (release direction). The nest moving mechanism 42 moves the first nests 28, 30 that form the protrusions 20 (20a, 20b) in the projecting direction, so that the second nests 32 to 36 (other than the first nests 28, 30). Of the second insert 36 other than the first inserts 28 and 30 is movable in the other direction.

In the injection molding method according to the present embodiment, first, the first inserts 28 and 30 and the second inserts 32 to 36 are separably arranged between the first forming mold 24 and the second forming mold 26. As a result, the cavity 38 is formed by the first inserts 28 and 30, the second inserts 32 to 36, the first molding die 24, and the second molding die 26. Next, the work 12 is injection-molded in the cavity 38, the second molding die 26 is relatively separated from the first molding die 24, and then the work extrusion mechanism 40 is used to form the first inserts 28, 30 and the second molding die. The nests 32 to 36 are moved together with the work 12 in the A2 direction. Next, of the first inserts 28, 30 and the second inserts 32 to 36, the first inserts 28, 30 that form the protruding portions 20 (20a, 20b) are moved in the protruding direction by the insert moving mechanism 42. Then, the second inserts 32 to 36 are set in a separable state, while at least one second insert 36 other than the first inserts 28 and 30 is moved in the other direction by the insert moving mechanism 42. ..

As a result, the second inserts 32 to 36 are movable in a direction other than the moving direction (projecting direction) of the first inserts 28 and 30 (for example, another direction that is the forming direction of the undercut portion 22). .. As a result, the large-sized work 12 having the undercut can be easily removed after the injection molding. Therefore, even with a large work 12 having a complicated undercut shape, injection molding can be efficiently performed.

In this case, the nest moving mechanism 42 has a first nest moving means 46 for moving the first nests 28, 30 in the projecting direction, and a projecting direction of the first nests 28, 30 by the first nest moving means 46. And a second nest moving means 48 for moving the second nest 36 in the other direction by converting the driving force to the other direction into the driving force to the other direction. This makes it possible to easily take out the work 12 from the injection molding apparatus 10 after injection molding the work 12 having the undercut portion 22.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various configurations can be adopted based on the contents of this specification.

DESCRIPTION OF SYMBOLS 10... Injection molding apparatus 12... Work 14... Work body 20, 20a, 20b... Projection part 22, 22a, 22b... Undercut part 24... 1st shaping|molding die 26... 2nd shaping|molding die 28, 30... 1st insert 32. ... 36... 2nd nest 38... Cavity 40... Work pushing mechanism 42... Nest moving mechanism

Claims (3)

In an injection molding apparatus that injection-molds a work having a protrusion that protrudes in one direction with respect to the work body, and an undercut portion that is formed in a direction different from the protrusion direction of the protrusion with respect to the work body,
A first mold,
A second mold,
A plurality of nests that are arranged to be separable between the first mold and the second mold and that form a cavity for molding the work together with the first mold and the second mold;
A work pushing mechanism for moving the plurality of inserts together with the work in a releasing direction in a state where the second forming die is relatively separated from the first forming die;
Of the plurality of inserts, the first insert forming the protruding portion is moved in the protruding direction so that the inserts other than the first insert are in a separable state, while the first insert is formed. A nest moving mechanism capable of moving at least one second nest other than the child in the other direction;
An injection molding device comprising: The injection molding apparatus according to claim 1,
The nest moving mechanism,
First nest moving means for moving the first nest in the projecting direction;
A second moving member is moved in the other direction by converting a driving force of the first inserting member in the projecting direction of the first inserting member into a driving force in the other direction. 2 child moving means,
An injection molding apparatus having: In an injection molding method of injection-molding a work, which has a protruding portion protruding in one direction with respect to the work body, and an undercut portion formed in a direction different from the protruding direction of the protruding portion with respect to the work body,
By arranging a plurality of inserts in a separable manner between the first mold and the second mold, a cavity is formed by the plurality of the inserts, the first mold and the second mold,
Injection-molding the work into the cavity, separating the second mold relative to the first mold,
By the work pushing mechanism, the plurality of inserts are moved in the mold release direction together with the work,
Of the plurality of inserts, the first insert forming the protruding portion is moved in the protruding direction by the insert moving mechanism so that the inserts other than the first insert are in a separable state. An injection molding method, wherein at least one second insert other than the first insert is moved in another direction by the insert moving mechanism.

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