JP7145246B2 - Injection molding apparatus and method for ejecting molded product obtained by said injection molding apparatus - Google Patents

Description

The present invention relates to an injection molding apparatus for obtaining a molded article by cooling and hardening a molten resin material injected into a cavity formed by a mold, and a method for ejecting the molded article obtained by the injection molding apparatus.

Conventionally, resin molded products have been generally used as exterior and interior parts of automobile bodies, and such resin molded products are cooled by filling a cavity formed in an injection molding machine with molten resin. After solidification, the mold is opened, and the resin molded product is ejected by an ejector pin provided in the mold so that it can move back and forth, thereby ejecting the resin molded product having a shape corresponding to the shape of the cavity.

In addition, in the resin molded product obtained by injection molding as described above, a plurality of product parts to be products are molded at the same time, and product parts adjacent to each other are separated by a runner part that is a passage of molten resin (resin material) to the cavity. It is connected. Then, after the resin molded product is taken out, the runner portion, which does not form the product and becomes an unnecessary portion, is cut off.

For example, in the injection molding apparatus disclosed in Patent Document 1, after the molding of the molded product is completed and the mold is opened, the product is pushed by a product ejection pin, while the runner connected to the product is Since the runner is held in close contact with the mold without being pushed by the runner push-out pin, the runner is cut off from the product by shearing force when the product is released from the mold.

Japanese Utility Model Laid-Open No. 1-115521

In the injection molding apparatus of Patent Document 1, the product and the runner are cut by providing a time difference between the process of pushing out the product by the product push-out pin and the process of pushing out the runner by the runner push-out pin. And depending on the positional relationship and shape of the runner, it may be difficult to reliably cut and separate the two.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and provides an injection molding apparatus and an injection molding apparatus which can separate a molded product from a mold and at the same time easily and reliably cut unnecessary parts with a simple structure. An object of the present invention is to provide a method for ejecting a molded product obtained by an injection molding apparatus.

In order to achieve the above object, an aspect of the present invention is an injection molding apparatus for cutting an unnecessary part of a molded product molded by an injection molding mold in the mold,
a first pin that presses either the product portion or the unnecessary portion other than the product portion of the molded product;
a second pin that presses the other of the product portion and the unnecessary portion that are not pressed by the first pin;
with
The molded product has a notch at the boundary between the product part and the unnecessary part that are adjacent in the width direction. offset to the side,
By pressing one side with a pin and twisting around the notched portion as a fulcrum, the unnecessary portion and the product portion are cut at the boundary.

According to the present invention, the injection molding apparatus includes a first pin that presses either the product portion or the unnecessary portion other than the product portion of the molded product, and the other of the product portion and the unnecessary portion that is not pressed by the first pin. In the molded product, a notch is formed at the boundary between the product portion and the unnecessary portion that are adjacent in the width direction, and the pin that presses one is arranged in the orthogonal direction of the unnecessary portion. It is arranged so as to be offset from the center toward the notch side.

When the molded product molded by the injection molding apparatus is taken out, the first pin is driven to press one of the product portion and the unnecessary portion, so that the pressed product portion or the unnecessary portion moves toward the other with the notch as a fulcrum. The product portion and the unnecessary portion can be cut at the boundary by being pressed in the moment direction and twisted from the notch portion.

As a result, a notch is provided at the boundary between the product portion and the unnecessary portion of the molded article, and a pin that presses either the product portion or the unnecessary portion is offset from the center of the unnecessary portion toward the notch portion. With this configuration, the molded product can be separated from the mold and at the same time, the product portion and the unnecessary portion can be easily and reliably cut and taken out.

According to the present invention, the following effects are obtained.

That is, when a molded product molded by an injection molding machine is taken out, a pin arranged so as to be offset from the center of the unnecessary part in the notch is driven to remove either the product part or the unnecessary part of the molded product. By pressing, the pressed product portion or unnecessary portion is pressed in the moment direction with a notch formed at the boundary between the two as a fulcrum, and twisted from the notch to separate the product portion and unnecessary portion at the boundary. It is possible to cut.

As a result, with a simple configuration in which a notch is provided at the boundary between the product portion and the unnecessary portion, and a pin is provided so as to be offset from the center of the unnecessary portion, the molded product can be separated from the mold at the same time as the product portion. Unnecessary parts can be easily and reliably cut and taken out.

1 is a cross-sectional view of a main part of an injection molding apparatus according to an embodiment of the present invention; FIG. 2 is an enlarged plan view showing the vicinity of an ejector mechanism and a molded article in the injection molding apparatus of FIG. 1; FIG. FIG. 2 is a single perspective view of an ejector mechanism that constitutes the injection molding apparatus of FIG. 1 ; FIG. 2 is a plan view of a molded product obtained by the injection molding apparatus of FIG. 1; FIG. 2 is a cross-sectional view of a main part showing a state in which a fixed mold and a movable mold of the injection molding apparatus in FIG. 1 are opened; 6A is a cross-sectional view of the main parts of the molded product and the ejector mechanism shown in FIG. 4 as seen from the width direction, and FIG. 6B shows a state in which the molded product of FIG. 6A is pressed downward by the first ejector pin. It is a partial sectional view. 7A and 7B are operation explanatory diagrams of an ejector process for taking out a molded product from the injection molding apparatus with the mold opened in FIG. 8A to 8C are explanatory diagrams of an ejector process for taking out a molded product from an injection molding apparatus by an ejector method different from that of FIGS. 7A and 7B.

BEST MODE FOR CARRYING OUT THE INVENTION An injection molding apparatus according to the present invention and a method for ejecting a molded product obtained by the injection molding apparatus will be described in detail below with reference to the accompanying drawings by citing preferred embodiments.

This injection molding apparatus 10, as shown in FIG. It includes an ejector mechanism 16 provided in the mold 14 for releasing the molded article S from the mold. It is displaced in the direction (arrow A, B direction) to approach or separate. An injection mold (mold) 17 is composed of the fixed mold 12 and the movable mold 14 .

The stationary mold 12 is fixed to, for example, a work station (not shown) via a plate-like stationary platen 18, and protrudes toward the movable mold 14 (in the direction of arrow A) with respect to a dividing surface 12a facing the movable mold 14. It has a convex portion 20 . The projections 20 are formed, for example, in a trapezoidal cross-sectional shape that tapers toward the movable mold 14 (in the direction of the arrow A), and have a shape and quantity corresponding to the shape of the product portion 50 of the molded article S to be molded. be provided. Here, the case where the injection molding apparatus 10 has two projections 20 spaced apart by a predetermined distance in the width direction (direction of arrow C) will be described.

On the other hand, the movable mold 14 is connected to a displacement mechanism (not shown) via a plate-like movable platen 22, and is recessed in a direction (arrow A direction) away from the fixed mold 12 with respect to a dividing surface 14a facing the fixed mold 12. It has a recess 24 . The concave portions 24 are formed in a shape and quantity (that is, two) corresponding to the shape of the product portion 50 of the molded article S at a position facing the convex portion 20 of the fixed mold 12, and the movable mold 14 is on the fixed mold 12 side. A cavity 26 is formed between the convex portion 20 and the concave portion 24 by approaching (in the direction of arrow B) and entering the concave portion 24 .

In addition, the movable die 14 includes a runner 28 provided between two adjacent recesses 24 on the side of the dividing surface 14a facing the fixed die 12; A pair of connecting gates 30 and a sprue 32 extending in a direction (arrow A direction) away from the dividing surface 14a with respect to the runner 28 are provided. The sprue 32 is connected to a resin material supply path 34 extending to the upper surface of the movable mold 14 on the side of the movable platen 22 (in the direction of arrow A), and is connected to an injection machine (not shown). Runners 28 are not limited to being provided between two adjacent recesses 24. For example, runners 28 may be provided for each of a plurality of recesses 24 and connected to an injection machine. good too.

The runner 28 and the gate 30 described above are formed in a straight line in the width direction (direction of arrow C) along the dividing surface 14a of the movable mold 14. and through the gate 30 into the cavity 26 . In other words, sprue 32 , runner 28 and gate 30 function as a resin injection channel for supplying resin material to cavity 26 .

Furthermore, as shown in FIGS. 1 and 2, the movable die 14 has a widthwise end portion of the gate 30 which is a boundary with the concave portion 24 from the front side in the depth direction (arrow D1 direction in FIG. 2). It has a protrusion 36 that protrudes in the depth direction (arrow D2 direction). The projecting portion 36 is formed, for example, in a triangular cross-sectional shape that tapers toward the center in the depth direction of the gate 30 when viewed from the moving direction of the movable mold 14 shown in FIG. A notch 58 is formed at the end of the portion 54 in the width direction. It should be noted that the projection 36 described above preferably has a size that does not hinder the flow of the resin material (molten resin) from the gate 30 to the cavity 26 .

The movable mold 14 is also provided with an ejector mechanism 16 and has a first through hole 38 penetrating to the recess 24 and a second through hole 40 penetrating to the runner 28 . The first and second through holes 38, 40 extend along the direction of movement of the movable die 14 (directions of arrows A, B) and are formed substantially parallel to each other. A first ejector pin 44 of the ejector mechanism 16 described later is inserted into the first through hole 38 , and a second ejector pin 46 of the ejector mechanism 16 is inserted into the second through hole 40 .

The ejector mechanism 16, as shown in FIGS. 1 to 3, has a base portion 42 and first and second ejector pins 44, 46 provided to move back and forth with respect to the base portion 42. The base portion 42 is, for example, housed in a housing portion 48 which is formed in a substantially rectangular shape and is open to the upper surface of the movable mold 14. Inside the housing portion 48 is a housing for moving the first and second ejector pins 44, 46 forward and backward. A drive source (not shown) is housed.

The first and second ejector pins 44 and 46 are, for example, shafts that are circular in cross section and extend in the axial direction (directions of arrows A and B) with a constant diameter. The first ejector pin 44 is formed to have a diameter smaller than that of the second ejector pin 46, and the first ejector pin 44 is inserted through the first through hole 38 of the movable mold 14 to form the second ejector pin (second pin). , pins) 46 are inserted into the second through holes 40 .

The first and second ejector pins 44 and 46 are provided substantially parallel to each other in the width direction (direction of arrow C) of the ejector mechanism 16 with a predetermined distance therebetween, and are perpendicular to the width direction (see FIG. 2). are arranged so as to be offset by a predetermined distance L in the directions of arrows D1 and D2).

Then, the first and second ejector pins 44 and 46 are moved toward the fixed mold 12 (in the direction of arrow B in FIG. 1) under the driving action of a drive source (not shown), whereby the first ejector pin 44 is The tip of the second ejector pin 46 protrudes from the first through hole 38 into the recess 24 and is exposed, and the tip of the second ejector pin 46 protrudes from the second through hole 40 into the runner 28 and is exposed. The first and second ejector pins 44 and 46 are independently movable in the axial direction under the driving action of a driving source (not shown).

Further, as shown in FIGS. 2 and 6A, the first ejector pin 44 is arranged in the recess 24 so as to face forward (in the direction of the arrow D1) by a predetermined distance L from the center in the depth direction. are arranged so as to face the center of the runner 28 in the depth direction in the recess 24 . In other words, since the first ejector pin 44 is offset in the depth direction (arrow D1 direction) with respect to the second ejector pin 46, the depth direction center of the concave portion 24 in the injection mold 17 is closer to the front side (arrow D1 direction). It faces a position offset in the D1 direction).

In other words, the first ejector pin 44 is positioned closer to the projection 36 side (arrow D1 direction) than the second ejector pin 46 in the depth direction (arrow D1, D2 direction) of the injection molding apparatus 10 (direction of arrow D1). 58 side) so as to be offset.

Next, the molded article S molded by the injection molding apparatus 10 described above will be described.

As shown in FIGS. 1 and 4, the molded product S is formed by simultaneously molding a plurality of product portions 50 used as products. Two product portions 50 provided apart from each other, a runner portion 52 provided between two adjacent product portions 50, and both width direction ends of the runner portions 52 and width direction ends of the product portions 50 are connected. and a sprue portion 56 to which a molten resin material (molten resin) is supplied to the runner portion 52 . For example, the gate portion 54 is formed to have a vertical dimension smaller than that of the runner portion 52 (see FIG. 1).

In the molded product S, the boundaries between the two product portions 50 and the pair of gate portions 54 are, as shown in FIG. ) is formed. The notch 58 is formed by the projection 36 (see FIG. 2) of the movable mold 14 during molding, and the projection 36 forms a triangular cross-section that tapers toward the center in the depth direction (arrow D2 direction). formed into shape.

The molded product S is filled with a molten resin material (hereinafter referred to as molten resin) through a resin material supply path 34 in a cavity 26 formed between the convex portion 20 of the fixed mold 12 and the concave portion 24 of the movable mold 14. By being cooled and solidified, the molten resin filled between the concave portion 24 and the convex portion 20 becomes the product portion 50, and the molten resin filled in the runner 28 and the gate 30 becomes the runner portion 52 and the gate portion 54. At the same time, the molten resin supplied to the sprue 32 connected to the resin material supply path 34 becomes the sprue portion 56 . In addition, the molded product S becomes an unnecessary part that does not use the runner part 52, the gate part 54, and the sprue part 56 other than the product part 50 as a product.

The injection molding apparatus 10 according to the embodiment of the present invention is basically constructed as described above, and the operation and effects thereof will now be described. The mold opening state (see FIG. 5) in which the movable mold 14 of the injection molding die 17 is separated upward from the fixed mold 12 will be described as an initial state.

First, from the initial state described above, the movable die 14 of the injection molding die 17 is lowered under the driving action of a displacement mechanism (not shown) so as to approach the fixed die 12, and as shown in FIG. , 14a are brought into contact with each other, and the convex portion 20 enters the concave portion 24, thereby forming a mold closed state in which a cavity 26 is formed.

After that, by injecting molten resin from an injection machine (not shown) into the resin material supply path 34 of the movable mold 14, the molten resin flows through the resin material supply path 34 from the sprue 32 to the runner 28 and the gate 30 to the cavity 26. supplied and filled. At this time, the flow rate of the molten resin to the product portion 50 side of the cavity 26 is controlled by the pair of gates 30 .

In addition, the ejector mechanism 16 has the first and second ejector pins 44 and 46 both retracted toward the base portion 42 (in the direction of arrow A) to be housed in the first and second through holes 38 and 40, and the distal end thereof do not protrude into cavity 26 (see FIG. 1).

Then, in a state in which the cavity 26 is filled with the molten resin, the molten resin is solidified by cooling for a predetermined period of time, and a molded article S having a shape corresponding to the shape of the cavity 26 is obtained. The molded product S includes a sprue portion 56 connected to the lower end of the resin material supply passage 34, a runner portion 52 extending in the width direction (direction of arrow C) so as to be substantially perpendicular to the sprue portion 56, and the runner portion It consists of a pair of gate portions 54 connected to both ends of the portion 52 in the width direction, and two product portions 50 connected to both ends of the gate portion 54 in the width direction and molded. A notch portion 58 is formed at the boundary between the gate portion 54 and the product portion 50 so as to extend from the front side in the depth direction toward the depth direction.

Next, an ejector process is performed to take out the molded product S from the injection molding die 17 . In this ejector step, first, as shown in FIG. 5, the movable mold 14 is lifted by a displacement mechanism (not shown) to be separated from the fixed mold 12 by a predetermined distance, thereby opening the mold. At this time, the molded product S moves upward (in the direction of arrow A) so as to separate from the fixed mold 12 together with the movable mold 14 while being in close contact with the concave portion 24 of the movable mold 14 .

A driving source (not shown) of the ejector mechanism 16 is driven based on a control signal from a controller (not shown) to advance the first ejector pin 44 toward the stationary mold 12 (in the direction of arrow B). From the state in which the tip is in contact with the upper surface of the product portion 50 of the molded product S (see FIG. 6A), the product portion 50 is pushed into the concave portion 24 and protrudes.

On the other hand, the second ejector pin 46 of the ejector mechanism 16 is not moved forward toward the fixed mold 12 (in the direction of arrow B), but remains accommodated in the second through hole 40, so that the runner portion of the molded product S 52 is not pressed by the second ejector pin 46 toward the fixed mold 12 (in the direction of arrow B), and the runner portion 52 is held in close contact with the concave portion 24 of the movable mold 14 .

Then, as shown in FIG. 7A, the product portion 50 pushed by the first ejector pin 44 is pushed downward from the recess 24 and begins to be released from the recess 24 .

At this time, as shown in FIG. 6B, in the product portion 50, a first ejector pin is provided in front of the runner portion 52 and the gate portion 54 provided at the center of the molded product S in the depth direction (in the direction of the arrow D1). A pressing force F is applied by 44 . As a result, a moment M is generated with the boundary between the gate portion 54 and the product portion 50 as a fulcrum. 7A, the gate portion 54 and the product portion 50 are cut and separated.

Finally, the product portion 50 and the gate portion 54 of the molded product S described above are separated, and with the product portion 50 released from the concave portion 24 of the movable mold 14, as shown in FIG. The second ejector pin 46 is advanced along the second through hole 40 under the driving action of a drive source (not shown), and the tip thereof protrudes from the second through hole 40 into the recess 24 to form the runner portion 52. press . As a result, the runner portion 52 together with the gate portion 54 separated from the boundary with the product portion 50 is pressed by the second ejector pin 46 toward the stationary mold 12 (in the direction of the arrow B), and the unnecessary portion of the runner portion 52 and the runner portion 52 are ejected. The gate portion 54 and the sprue portion 56 connected to the runner portion 52 are integrally separated from the movable mold 14 and taken out.

As described above, in the present embodiment, in the injection molding apparatus 10 for obtaining the molded article S by injecting the molten resin into the cavity 26, the molded article S is released from the movable mold 14 opened after molding. The ejector mechanism 16 has a first ejector pin 44 that presses the product portion 50 of the molded product S toward the fixed mold 12 (in the direction of arrow B), and the first ejector pin 44 A second ejector pin 46 is provided for pressing an unnecessary portion such as the runner portion 52 of the molded product S that is not pressed toward the fixed mold 12 side, and is connected to the product portion 50 and the runner portion 52 of the molded product S. A notch portion 58 is formed at the boundary with the gate portion 54 which is located in the center. In addition, the first ejector pin 44 is offset toward the notch 58 side with respect to the center in the depth direction of the runner portion 52 perpendicular to the width direction of the molded product S, that is, toward the near side in the depth direction (arrow D1 direction). are placed.

When the molded article S molded by the injection molding apparatus 10 is taken out, only the first ejector pin 44 of the ejector mechanism 16 is driven to push out the product portion 50 from the movable mold 14 toward the fixed mold 12, whereby the product is ejected. The portion 50 is pressed in the moment direction (downward) with respect to the runner portion 52 with the notch portion 58 as a fulcrum, and is twisted with the notch portion 58 as a fulcrum. It breaks from 58 and is cut.

As a result, the first ejector pin 44 of the ejector mechanism 16 that presses the product portion 50 of the molded product S is offset from the center in the depth direction to the front side with respect to the runner portion 52, which is an unnecessary portion, and the product portion 50 is and the gate portion 54, in the ejector step of opening the mold to separate the fixed mold 12 and the movable mold 14 and taking out the molded product S, the unnecessary molded product S is removed. It is possible to easily and reliably cut the runner portion 52 and the like from the product portion 50 and take them out.

Further, the product portion 50 of the molded product S is pressed by the first ejector pin 44 to cut the unnecessary portion such as the runner portion 52 from the product portion 50 at the boundary. is pressed to eject the runner portion 52 from the concave portion 24 of the movable mold 14, so that the product portion 50 and the runner portion 52 of the molded product S can be separated and taken out at the same time after the mold is opened. The manufacturing time of the molded article S can be shortened.

By advancing the second ejector pin 46 ahead of the first ejector pin 44 and pressing the runner portion 52 to release the runner portion 52 , the product portion 50 is cut at the boundary with the product portion 50 via the notch portion 58 . After that, the first ejector pin 44 may be used to release the product portion 50 from the concave portion 24 .

On the other hand, the ejector process for removing the molded product S from the injection mold 17 is limited to the case where the first ejector pin 44 and the second ejector pin 46 are driven with a time difference after the mold is opened as described above. Instead, for example, as in the ejector process shown in FIGS. 8A to 8C, the injection mold 17 may be opened and the first ejector pin 44 may be advanced at the same time.

Specifically, first, as shown in FIG. 8B, the movable mold 14 is lifted by a displacement mechanism (not shown) from the mold clamping state after the molding of the molded product S shown in FIG. 8A is completed, thereby At the same time, the second ejector pin 46 of the ejector mechanism 16 is advanced toward the fixed mold 12 (in the direction of arrow B) based on a control signal from a controller (not shown), and downward. The second ejector pin 46 is caused to follow such that the runner portion 52 remains in contact with the divided surface 12a of the stationary mold 12 which is separated from the second ejector pin 46. As shown in FIG.

That is, the second ejector pin 46 is advanced toward the fixed mold 12 (in the direction of arrow B) by the amount of displacement of the movable mold 14 upward (in the direction of arrow A). In other words, the second ejector pin 46 is advanced so that the runner portion 52 does not move relative to the dividing surface 12a of the stationary mold 12 while being in contact with the dividing surface 12a, and the runner portion 52 is held down by its tip. Keep

On the other hand, the first ejector pins 44 of the ejector mechanism 16 are not advanced toward the stationary mold 12 and are kept in the first through-holes 38 so that the first ejector pins 44 eject the molded product S. The part 50 is not pressed toward the fixed mold 12 (in the direction of the arrow B), and the product part 50 rises together with the movable mold 14 while being in close contact with the concave portion 24 of the movable mold 14 .

As the product portion 50 rises together with the movable mold 14 with respect to the runner portion 52 held in contact with the fixed mold 12 by the second ejector pin 46, a moment M is generated with the boundary between the two as the fulcrum. , the product portion 50 and the gate portion 54 begin to break from the notch portion 58 provided at the boundary, and break along the depth direction. cut and separated.

As described above, in the state where the product portion 50, the gate portion 54 and the runner portion 52 of the molded product S are separated, the movable mold 14 is moved without driving the second ejector pins 46 as shown in FIG. 8C. By further lifting, the runner part 52 is separated from the parting surface 12a of the fixed mold 12, and the first ejector pin 44 is advanced along the first through hole 38 under the driving action of a driving source (not shown). , and presses the product portion 50 toward the stationary mold 12 (in the direction of arrow B) with its tip. As a result, the product portion 50 separated from the boundary with the gate portion 54 is released from the concave portion 24 by the first ejector pin 44 and taken out.

According to the ejector process described above, when opening the mold of the injection molding apparatus 10, the second ejector pin 46 presses the unnecessary portion such as the runner portion 52 so as to remain in contact with the dividing surface 12a of the fixed mold 12. By doing so, a notch portion 58 is provided at the boundary between the product portion 50 held in close contact with the concave portion 24 and the runner portion 52 held on the side of the fixed mold 12 using the movement of the movable mold 14. can be cut as a starting point.

Therefore, compared to the case where the molded product S is taken out by the ejector mechanism 16 after the mold of the injection molding apparatus 10 is opened, the runner part 52 and the product part 50 are separated at the same time as the mold is opened, thereby shortening the time in the ejector process. In addition, cutting can be performed before the temperature of the molded article S is lowered, and cutting can be performed more easily and reliably than when the molded article S is cut after curing.

In addition, in the molded article S, the unnecessary parts such as the runner part 52 are pushed out prior to the product part 50, so that the appearance defect of the required product part 50 can be prevented. can be avoided.

Furthermore, for example, compared with the case where the first ejector pin 44 and the second ejector pin 46 are arranged separately on the movable mold 14 side and the fixed mold 12 side, respectively, the ejector mechanism 16 including the first and second ejector pins 44 and 46 is are provided on the same movable mold 14 side, the size of the injection molding apparatus 10 can be reduced.

Furthermore, in the above embodiment, for example, one runner portion 52, one gate portion 54 and one sprue portion 56 functioning as a resin injection path are provided for the molded product S, but the present invention is limited to this. not to be When a plurality of runner portions 52, gate portions 54 and sprue portions 56 are provided according to the shape and size of the molded product S, similar effects can be obtained by providing the ejector mechanism 16 according to the number of unnecessary portions. can.

Furthermore, in the above embodiment, one first ejector pin 44 and one second ejector pin 46 are arranged in the ejector mechanism 16, but the present invention is not limited to this. A plurality of first ejector pins 44 and a plurality of second ejector pins 46 can be arranged according to the size and shape of the molded article S and the number of unnecessary parts.

It should be noted that the injection molding apparatus according to the present invention and the method for ejecting a molded product obtained by the injection molding apparatus are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10... Injection molding apparatus 12... Fixed mold 14... Movable mold 16... Ejector mechanism 26... Cavity 28... Runner 30... Gate 32... Sprue 34... Resin material supply path 44... First ejector pin 46... Second ejector pin 50... Product Part 52... Runner part 54... Gate part 58... Notch part S... Molded product

Claims (5)

An injection molding device for cutting unnecessary parts of a molded product molded by an injection mold in the mold,
a first pin that presses either the product portion of the molded product or the unnecessary portion other than the product portion;
a second pin that presses the other of the product portion and the unnecessary portion that are not pressed by the first pin;
with
The molded product has a cutout portion at the boundary between the product portion and the unnecessary portion adjacent in the width direction, and the pin for pressing the one is positioned in the direction orthogonal to the unnecessary portion in the orthogonal direction orthogonal to the width direction. arranged offset to the notch side with respect to the center,
An injection molding apparatus, wherein the one is pressed by the pin and twisted about the notch to cut the unnecessary part and the product part at the boundary. A method for ejecting a molded product obtained by the injection molding apparatus according to claim 1,
After one of the product portion and the unnecessary portion is pressed by the first pin and the unnecessary portion and the product portion are cut at the boundary,
A method for ejecting a molded product, wherein the second pin presses the other to eject the other from the injection mold. A method for ejecting a molded product obtained by the injection molding apparatus according to claim 1,
The injection mold has a fixed mold and a movable mold that approaches and separates from the fixed mold,
The unnecessary portion and the product portion are cut by opening the mold while the one is pressed against either the fixed mold or the movable mold by the first pin,
A method of ejecting a molded product, wherein after the mold opening of the movable mold with respect to the fixed mold is completed, the other part is ejected from the injection mold by the second pin. The eject method according to claim 2 or 3,
A method for ejecting a molded product, wherein the first pin presses the unnecessary portion and the second pin presses the product portion. The eject method according to claim 3,
A method of ejecting a molded product, wherein the first and second pins are arranged on the movable mold side, and the first pin presses the one against the fixed mold.

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