JP2021094791A - Injection mold - Google Patents

Abstract

To process an undercut without installing an undercut processing mechanism in a fixed mold, even if a bent part of a resin molded product becomes an undercut when the fixed mold and a movable mold are separated.SOLUTION: A first movable mold part 5 that is moved in a detaching direction with respect to a fixed mold 1 and is arranged ahead of the bending direction of a bending part 42 of a resin molded product 4, a second movable mold part 6 that is arranged at a position of the bent part 42 of the resin molded product 4 in relation to the first movable mold part 5 and is released from the first movable mold part 5 while holding the bent part 42, and an insertion and removal member 12 that is located between the second movable mold part 6 and the first movable mold part 5 and is moved in the separation direction by a drive separate from the movement of the first movable mold part 5 to be inserted and removed from a space 11 between the second movable mold part 6 and the first movable mold part 5 are set on a movable mold 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to an injection molding mold, particularly an injection molding mold in which a resin is injected into a cavity formed between a fixed mold and a movable mold to mold a resin molded product.

When a resin molded product is molded by injection molding, an undercut may occur in the molded product. The undercut refers to a portion that cannot be released as it is when the molded product is taken out from the mold, and usually consists of a convex portion or a concave portion. In the injection molding die, a method for eliminating (treating) such undercut is widely and variously used, and an example thereof is the injection molding die described in Patent Document 1 below. In many injection molding molds including this injection molding mold, a mechanism for processing undercut is provided in the movable mold, and after separating the fixed mold and the movable mold, the undercut processing mechanism is operated to produce a molded product. Release the mold. The undercut treatment, for example, as seen in Patent Document 1 below, refers to a general measure that enables the molded product to be released from the molded product when the bent portion of the resin molded product becomes undercut. Therefore, the undercut process also includes the case where the fixed type and the movable type cannot be separated by the undercut.

Japanese Unexamined Patent Publication No. 2014-151562

By the way, in an injection-molded product, for example, a minute ridge portion called a parting line is formed at a joint portion between a fixed mold and a movable mold, and a joint portion between mold portions constituting the movable mold or between mold members. Some resin molded products for vehicles are painted with color, but for example, in the product after painting, the coating film on the parting line becomes thin, and the thin coating film part has different color streaks. It may be seen as.

In such a case, due to the design of the product, there is a demand to set the parting line in an invisible place, and as a result, for example, a bent portion in which the molded product is bent in a direction intersecting the fixed and movable mold opening / closing directions. It may be necessary to abut the fixed mold and the movable mold at a position deviated from the bulging end of the bent portion. In such a case, the outer portion of the bent portion of the resin molded product becomes undercut, and there is a possibility that the fixed mold and the movable mold cannot be separated. In such a case, it is possible to process the undercut by providing the fixed mold with an undercut processing mechanism. However, the fixed mold generally forms the outer surface of the molded product, so to speak, the design surface, and if the fixed mold is provided with an undercut processing mechanism, the processing mechanism portion of the fixed mold needs to divide the fixed mold. , The parting line is formed on the divided part, that is, the design surface, and the design is also deteriorated.

The present invention has been made in view of the above problems, and an object of the present invention is to fix even if the outer portion of the bent portion of the resin molded product becomes an undercut when separating the fixed mold and the movable mold. An object of the present invention is to provide an injection molding mold capable of processing an undercut without providing a mold with an undercut processing mechanism.

In order to achieve the above object, the injection molding mold of the present invention is
An injection-molded mold in which a resin is injected into a cavity formed between a fixed mold and a movable mold to mold a resin molded product, and the resin molded product intersects the mold opening / closing directions of the fixed mold and the movable mold. In an injection-molded mold having a bent portion bent in the direction of the resin molded product, the fixed mold and the movable mold are butted at a position deviated from the bulging end of the bent portion of the resin molded product.
The movable mold is moved in the detaching direction with respect to the fixed mold, and is arranged at the bending direction of the bent portion of the resin molded product. A second movable mold portion that is arranged at the position of the bent portion of the resin molded product and is separated from the first movable mold portion while holding the bent portion of the resin molded product, and the second movable mold portion. It is located between the first movable mold portion and the first movable mold portion, and is moved in the detaching direction by a drive different from the movement of the first movable mold portion, and is between the second movable mold portion and the first movable mold portion. It is characterized by being provided with an insertion / extraction member that is inserted / removed into the space of.

According to this configuration, when the insertion / extraction member is pulled out and there is a space between the second movable mold portion and the first movable mold portion, the second movable mold portion approaches the space side, that is, the first movable mold portion side. Then, the bent portion of the resin molded product held by the second movable mold portion is moved to the first movable mold portion side, whereby the portion including the bent portion of the resin molded product is moved inward of the bend. It is elastically deformed. Therefore, even if the outer portion of the bent portion of the resin molded product is undercut when the fixed mold and the movable mold are separated, that portion can be separated from the fixed mold, and as a result, the undercut is formed. It can be processed to separate the fixed type and the movable type. In addition, when the movable mold requires rigidity as in the case of resin injection molding, by inserting the insertion / extraction member into the space, there is no movable gap between the first movable mold portion and the second movable mold portion, and the movable mold is movable. The rigidity of the mold is ensured.

Further, in another configuration of the present invention, the second movable mold portion is a first mold member on the side of the first movable mold portion that sandwiches the bent portion of the resin molded product from a direction orthogonal to the separation / contact direction, and a first mold member thereof. It has a second mold member on the opposite side, and the first mold member and the second mold member are separately separated from the first movable mold portion.

According to this configuration, the first mold member and the second mold member sandwiching the bent portion of the resin molded product are integrally formed with a space between the first movable mold portion and the second movable mold portion. The part including the bent part is elastically deformed by approaching the first movable mold part side, and undercut is processed in that state to separate the fixed mold and the movable mold, and then the fixed mold and the movable mold are separated from each other. If the second mold member is separated from the first movable mold portion, for example, the elastically deformed portion including the bent portion of the resin molded product can be restored, and the resin molded product can be separated from the movable mold. ..

A further configuration of the present invention is that the second movable mold member is the first mold member and the second mold member in a state where the insertion / extraction member is pulled out, the space exists, and the bent portion of the injection molded product is sandwiched. Is integrally moved in a direction approaching the first movable mold portion, and then the first mold member and the second mold member are separately moved in a direction away from the first movable mold portion. It is a feature.

According to this configuration, the first mold member and the second mold member sandwiching the bent portion of the resin molded product are integrally formed with a space between the first movable mold portion and the second movable mold portion. The portion including the bent portion is elastically deformed when approached to the first movable mold side, and in that state, undercut is processed to separate the fixed mold and the movable mold, and then the fixed mold and the movable mold are separated from each other. By separating the second mold member from the first movable mold portion, the elastically deformed portion including the bent portion of the resin molded product is restored, and the resin molded product can be separated from the movable mold.

In a further configuration of the present invention, the first type member is divided into a first split type member on the side of the first movable mold portion and a second split type member on the opposite side, and the first split type member and the first split type member The second split type member is separately separated from the first movable mold portion, and the second split type member is separated from the first movable mold portion, and the second split type member is separated from the first movable mold portion. It is characterized in that a delay mechanism for moving away from the first movable mold portion is provided.

According to this configuration, by sandwiching the bent portion of the resin molded product between the second split mold member and the second mold member, the second mold member is separated from the first movable mold portion. With a delay, the second split mold member can separate the bent portion of the resin molded product from the first movable mold portion so as to push it out from the first split mold member, which facilitates the mold release of the resin molded product.

As described above, according to the present invention, even when the outer portion of the bent portion of the resin molded product becomes an undercut when separating the fixed mold and the movable mold, the fixed mold is provided with an undercut processing mechanism. Undercutting can be performed without providing it, which makes it possible to manufacture a resin molded product having excellent design.

It is sectional drawing which shows one Embodiment of the injection molding mold of this invention. It is a detailed view of the injection molding mold of FIG. It is operation | movement explanatory drawing of the injection molding mold of FIG. It is operation | movement explanatory drawing of the injection molding mold of FIG. It is a detailed view of the injection molding mold of FIG. It is operation | movement explanatory drawing of the injection molding mold of FIG. It is a detailed view of the injection molding mold of FIG. It is a detailed view of the conventional injection molding type. It is explanatory drawing of the resin molded article (product) manufactured by the injection molding die of FIG. It is explanatory drawing of the resin molded article (product) manufactured by the injection molding die of FIG.

Hereinafter, embodiments of the injection molding mold of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a state in which injection molding of a resin is completed using the injection molding mold of this embodiment. Similar to the existing injection molding mold, the injection molding mold of this embodiment is roughly classified into, for example, a fixed mold 1 in the right half of the figure and a movable mold 2 in the left half of the figure. As is well known, the resin molded product 4 is molded by injecting resin into the cavity 3 formed between the fixed mold 1 and the movable mold 2. The shape of the molded product to be injection-molded is various, and the resin molded product 4 of this embodiment is also one of such various molded products, but in general, the fixed mold 1 is also called a female mold and is molded. It is used to form the outer surface of an article, that is, the design surface. Also in this embodiment, the fixed mold 1 forms the outer surface (design surface) of the resin molded product 4.

The movable mold 2 is moved (sliding) with respect to the fixed mold 1 in the detaching direction, in this case, the left-right direction in the figure (hereinafter, also referred to as the mold opening / closing direction) by a drive source (not shown). The upper part of the movable mold 2 is a first movable mold portion 5 (meaning a part of the mold) that forms a main part of the cavity 3 with the fixed mold 1, and is mainly the first movable mold. By moving the mold portion 5 by a drive source (not shown), the entire movable mold 2 including the second movable mold portion 6 described later is separated from the fixed mold 1. In this embodiment, as will be described later, from the portion (hereinafter, inclined portion) 41 of the resin molded product 4 that is oblique from the upper right to the lower left of the figure at the central portion in the vertical direction of the figure, and the lower end portion thereof. The portion (hereinafter referred to as the bent portion) 42 that is bent diagonally upward is subject to the undercut treatment. The bent portion 42 of the resin molded product 4 is bent in a direction intersecting the mold opening / closing direction of the fixed mold 1 and the movable mold 2, and the first movable mold portion 5 is a bent portion of the resin molded product 4. It is arranged in the bending direction of 42. Therefore, in this embodiment, this portion (lower part) of the first movable mold portion 5 is recessed, and the undercut processing mechanism is arranged here. The mold member constituting the first movable mold portion 5 extends downward on the left side of the drawing.

The second movable mold portion 6 is arranged in the recessed portion formed in the first movable mold portion 5, that is, below the first movable mold portion 5 (= either of the directions orthogonal to the mold opening / closing direction). It is installed. As will be described later, the second movable mold portion 6 is composed of a first mold member 7 and a second mold member 8, and the first mold member 7 is further formed into a first split mold member 9 and a second split mold member 10. The members are divided, and the cylinder rod 13a is integrally moved by the hydraulic cylinder 13 extending in the vertical direction in the drawing, or is moved separately. The details of the movement will be described later, but the entire second movable mold portion 6 is separated from the first movable mold portion 5 in the vertical direction in the drawing by the hydraulic cylinder 13. In order to facilitate understanding, the arrangement of the above-mentioned members will be briefly described. The second movable mold portion 6 is the first mold member 7 on the first movable mold portion 5 side and the second mold on the opposite side. The first type member 7 is composed of a member 8, and is divided into a first split type member 9 on the side of the first movable mold portion 5 and a second split type member 10 on the opposite side. Further, the cylinder rod 13a of the hydraulic cylinder 13 is directly connected only to the second type member 8.

A space 11 to be described later is provided above the second movable mold portion 6, that is, between the first movable mold portion 5, and in FIG. 1, the insertion / extraction member 12 is inserted into the space 11. .. In the state shown in the figure, the lower surface of the insertion / extraction member 12 is in contact with the upper surface of the first split type member 9 arranged at the uppermost part of the second movable mold portion 6 in the drawing, whereby the first movable mold portion 6 5. The insertion / extraction member 12 and the second movable mold portion 6 are in contact with each other, and there is no movable gap between the members, that is, inside the movable mold 2. The insertion / extraction member 12 is driven separately from the left side of the figure in the mold opening / closing direction (parallel to the direction) by a drive source separate from the drive source of the first movable mold portion 5, and is inserted into the space 11. Therefore, when the insertion / extraction member 12 is pulled out to the left in the drawing, a space 11 is formed above the second movable mold portion 6. In this embodiment, both the lower surface of the insertion / extraction member 12 and the upper surface of the first split type member 9 of the second movable mold portion 6 are formed with a gradient from the upper right to the lower left of the figure, from the left side of the figure. The insertion / extraction member 12 is configured so that it can be smoothly inserted / removed into the space 11.

The tip of the bent portion 42 of the resin molded product 4 described above is slightly extended to the left in the figure. FIG. 2 is a detailed view showing a lower tip portion and a bent portion 42 of the inclined portion 41 of the resin molded product 4 in FIG. The second movable mold portion 6 sandwiches the tip extending portion 43 of the bent portion 42 of the resin molded product 4 from the vertical direction (= direction orthogonal to the mold opening / closing direction) in the figure, and the first mold member 7 and the second mold. It is composed of a member 8. Further, the first mold member 7 includes the second split mold member 10 that abuts only on the tip extending portion 43 of the bent portion 42 of the resin molded product 4 from above in the drawing, and the inner side surface and the inclination of the bent portion 42. It is divided into the first division type member 9 that abuts on the inner side surface of the portion 41. These members are described as "sandwiching" or "contacting" the resin molded product 4, but since they are all mold members, one of the movable molds 2 that form the cavity 3 during injection molding. Functions as a department.

As shown in FIG. 1, the upper end of the second split type member 10 can be fitted into the recessed portion on the lower surface of the first split type member 9, and is fitted into the recessed portion when the cavity is formed. .. Further, a downwardly extending portion that is partially extended downward from the second split type member 10 is inserted into the second type member 8. The downwardly extending portion of the second split type member 10 is movable in the vertical direction in the second type member 8, and a spring member 14 is interposed between the two. The second split type member 10 and the second type member 8 are urged in a direction away from each other by the spring member 14, and when the spring member 14 is compressed by a predetermined amount, the second split type member 10 and the second mold The members 8 are mechanically coupled and move integrally. Further, a spring member (not shown) is interposed between the second type member 8 and the first split type member 9, and is urged in a direction in which they are separated from each other. In this embodiment, as will be described later, the second mold member 8 and the fixed mold 1 in the cavity 3 are butted against each other slightly closer to the tip of the bent portion 42 of the resin molded product 4. That is, the fixed mold 1 and the movable mold 2 are butted at positions shifted from the bulging end (bending protruding end) of the bent portion 42 of the resin molded product 4 toward the tip end portion of the bent portion 42.

Prior to the description of the mold removal (removal) procedure of the resin molded product 4, the undercut in this embodiment will be described. As inferred from FIG. 2, the outer portion of the bent portion 42 (strictly speaking, the curved portion) rising upward from the inclined portion 41 of the resin molded product 4 is inserted into the fixed mold 1. Therefore, when the movable mold 2 is separated from the fixed mold 1, the inserted portion becomes an undercut in the mold opening / closing direction. In the injection molding molds prior to this, as shown in FIG. 8, the movable mold 2 and the fixed mold 1 thrust at the lowermost portion of the outer portion of the bent portion 42 of the resin molded product 4, that is, at the position of the bulging end of the bent portion 42. The mold members were laid out so that they would fit together. Therefore, the lowermost portion of the outer portion of the bent portion 42 becomes a dividing line of the mold member, and a parting line is generated in this portion. In this conventional mold member configuration, undercut does not occur when the fixed mold 1 and the movable mold 2 are separated.

FIG. 9 is a cross-sectional view of a state in which the resin molded product 4 molded by the injection molding mold of FIG. 8 is mounted on a vehicle. In the figure, for example, the resin molded product 4 of FIG. 1 is assembled to the vehicle in a state of being rotated by 180 °, and diagonally above the inclined portion 41 of the resin molded product 4, it is continuous with the inclined portion 41. A panel member P made of a steel plate is arranged on the surface. The resin molded product 4 is colored and commercialized, and the painted product 4a is mounted on the vehicle. In the resin molded product 4 (product 4a) molded by the injection molding mold of FIG. 8, the parting line is located at the arrow portion of FIG. As described above, in the colored coating product 4a, the coating film on the parting line becomes thin, and the portion appears (visible) as a black streak, and the design is inferior. Therefore, as shown by an arrow in FIG. 10, the parting line of the resin molded product 4 (product 4a) is set on the panel member P side, that is, near the tip of the bent portion 42, and the design is made invisible from the outside. There was a request to secure it.

From the above, as is clearly shown in FIG. 2, in this embodiment, the abutting portion between the fixed mold 1 and the movable mold 2, specifically, the second mold member 8 of the second movable mold portion 6 is a resin molded product. The bending end 42 of No. 4 is changed from the bulging end toward the tip, and as a result, the undercut occurs. Hereinafter, the mold removal procedure of the resin molded product 4 including the undercut treatment of this portion will be described. First, from the state of FIG. 1, the insertion / extraction member 12 is pulled out to the left side of FIG. 1, and as shown in FIG. 3, the space 11 is created above the first division type member 9 of the second movable mold portion 6. .. Next, the cylinder rod 13a of the hydraulic cylinder 13 is moved upward in FIG. 3 in a state where the first split type member 9, the second split type member 10, and the second type member 8 of the second movable mold portion 6 are all in contact with each other. Stretch. As a result, as shown in FIG. 4, the tip extending portion 43 of the bent portion 42 of the resin molded product 4 is sandwiched between the second split mold member 10 and the second mold member 8, so that the first mold member 7 and the first mold member 7 and the second With the bent portion 42 held by the type 2 member 8, the entire second movable mold portion 6 is integrally pushed up in the upper part of the drawing, that is, in the space 11.

FIG. 5 is a detailed view showing a lower tip portion and a bent portion 42 of the inclined portion 41 of the resin molded product 4 in the state of FIG. As described above, the tip extending portion 43 of the bent portion 42 is sandwiched by the second split type member 10 and the second type member 8, and the entire bent portion 42 is held by the first type member 7 and the second type member 8. As shown in FIG. 5, the resin molded product 4 pushed upward is in a state where the base side of the inclined portion 41 is held by the first movable mold portion 5 and the fixed mold 1, and the tip portion side thereof is upward. It elastically deforms to bend. Along with this, the outer portion of the bent portion 42 of the resin molded product 4 is also lifted upward, a gap is formed between the bent portion 42 and the fixed mold 1, and the undercut of that portion is eliminated. In this state, as shown in FIG. 6, the movable mold 2 can be separated from the fixed mold 1 and the undercut is processed. Since the bent portion 42 of the resin molded product 4 is engaged with the movable mold 2, the resin molded product 4 remains on the movable mold 2 side.

When the cylinder rod 13a of the hydraulic cylinder 13 is contracted from this state, first, only the second type member 8 directly connected to the cylinder rod 13a is the first type member 7 (= first split type member 9 + first). It is moved to the lower part of FIG. 6 separately from the two-divided member 10), whereby the bent portion 42 of the resin molded product 4 by the second-divided member 10 and the second-type member 8, particularly the tip thereof. The sandwiching of the stretched portion 43 is released. After that, the spring member 14 interposed between the second mold member 8 and the second split mold member 10 is compressed by a predetermined amount, and the second mold member 8 and the second split mold member 10 are mechanically coupled. Then, the second split type member 10 of the first type member 7 is also moved to the lower side of FIG. 6 after the lowering of the second type member 8. Therefore, the spring member 14, and the mechanical coupling structure of the second split type member 10 and the second type member 8 that accompanies the compression of the spring member 14 constitute a delay mechanism.

FIG. 7 is a detailed view showing a lower tip portion and a bent portion 42 of the inclined portion 41 of the resin molded product 4 in the state of FIG. As described above, when the second split type member 10 is moved downward, the bent portion 42 of the resin molded product 4, particularly the tip extending portion 43 thereof, is pushed downward by the bent portion 42. The engagement between the inner portion of the first split type member 9 and the first split type member 9 is released. As a result, all the engagement between the resin molded product 4 and the movable mold 2 is released, so that the resin molded product 4 is released from the mold. In this embodiment, since the first split type member 9 does not protrude into the inner portion of the bent portion 42 of the resin molded product 4, if the second type member 8 is moved downward by the hydraulic cylinder 13. , The elastic deformation force with respect to the resin molded product 4 may be released, and the mold-removable state of FIG. 6 may be restored. In this embodiment, the second split mold member 10 is pulled down behind the second mold member 8, thereby pushing down the tip extending portion 43 of the bent portion 42 of the resin molded product 4, so that the resin molded product 4 is reliably obtained. It is possible to release the mold.

To return the injection mold to the state shown in FIG. 1, the device may be operated in the reverse procedure of the previous procedure. Incidentally, as described above, in the injection molding mold returned to the state of FIG. 1, there is no movable gap of the mold member in the movable mold 2 before the resin is injected. In injection molding, the resin is injected into the cavity 3 at a high pressure, so it is particularly desirable that there is no movable gap between the mold members constituting the movable mold 2. That is, the movable mold 2 is desired to have high rigidity that can withstand the high pressure of injection molding, but the injection molding mold of the embodiment having no movable gap in the movable mold 2 can secure the required rigidity. it can.

As described above, in the resin molding mold of the above-described embodiment, the insertion / extraction member 12 is pulled out and there is a space 11 between the second movable mold portion 6 and the first movable mold portion 5, and the space 11 side, that is, the first When the second movable mold portion 6 approaches the 1 movable mold portion 5 side, the bent portion 42 of the resin molded product 4 held by the second movable mold portion 6 is moved to the first movable mold portion 5 side. As a result, the portion of the resin molded product 4 including the bent portion 42 is elastically deformed in the inward direction of the bend. Therefore, even if the outer portion of the bent portion 42 of the resin molded product 4 is undercut when the fixed mold 1 and the movable mold 2 are separated, that portion can be separated from the fixed mold 1. As a result, the fixed mold 1 and the movable mold 2 can be separated by processing the undercut. Further, even when the movable mold 2 requires rigidity as in the case of injection molding of resin, the insertion / extraction member 12 can be inserted into the space 11 between the first movable mold portion 5 and the second movable mold portion 6. There is no movable gap, and the rigidity of the movable mold 2 is ensured.

Further, in a state where there is a space 11 between the first movable mold portion 5 and the second movable mold portion 6, the first mold member 7 and the second mold member 8 sandwiching the bent portion 42 of the resin molded product 4 are inserted. The portion including the bent portion 42 is elastically deformed by integrally approaching the first movable mold portion 5 side, and undercut is processed in that state to separate the fixed mold 1 and the movable mold 2, and then the first movable mold portion 1 and the movable mold 2 are separated. If the second mold member 8 is separated from the first movable mold portion 5 separately from the mold member 7, for example, the elastically deformed portion including the bent portion 42 of the resin molded product 4 is restored and resin molding is performed. The product 4 can be separated from the movable mold 2.

Further, in a state where the insertion / extraction member 12 is pulled out, the space 11 exists, and the bent portion 42 of the injection molded product 4 is sandwiched, the first mold member 7 and the second mold member 8 are integrally formed in the first movable mold portion 5. It is moved in the approaching direction, that is, in the space 11, and then in the direction in which the first mold member 7 and the second mold member 8 are separately separated from the first movable mold portion 5. Therefore, the first mold member 7 and the second mold member 8 sandwiching the bent portion 42 of the resin molded product 4 are integrally approached to the first movable mold portion 5 side, and the portion including the bent portion 42 is elastically deformed. Then, undercut is processed in that state to separate the fixed mold 1 and the movable mold 2, and then the second mold member 8 is separated from the first movable mold portion 5 separately from the first mold member 7. As a result, the elastically deformed portion including the bent portion 42 of the resin molded product 4 is restored, and the resin molded product 4 can be separated from the movable mold 2.

Further, by sandwiching the bent portion 42 of the resin molded product 4 between the second split mold member 10 and the second mold member 8, the second mold member 8 becomes the first movable mold portion by the delay mechanism. The second split mold member 10 can be separated from the first movable mold portion 5 so as to push the bent portion 42 of the resin molded product 4 from the first split mold member 9 after being separated from the first split mold member 9. This facilitates the release of the resin molded product 4.

Although the resin molding mold according to the embodiment has been described above, the present invention is not limited to the configuration described in the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the above embodiment, when the resin molded product 4 is released from the mold, the second mold member 8 is lowered first, and then the second split mold member 10 is lowered. And the second split type member 10 may be lowered at the same time, and then only the second type member 8 may be lowered.

Further, in the above embodiment, the first mold member 7 is divided into the first split mold member 9 and the second split mold member 10, but as described above, when only the second mold member 8 is lowered in advance. When the elastic deformation of the resin molded product 4 can be smoothly restored and the mold can be released, the division of the first mold member 7 is not essential.

1 Fixed type 2 Movable type 3 Cavity 4 Molded product 5 1st movable mold part 6 2nd movable mold part 7 1st mold member 8 2nd mold member 9 1st split mold member 10 2nd split mold member 11 Space 12 Insertion member 13 Hydraulic cylinder 14 Spring member 42 Bent part

Claims (4)

An injection-molded mold in which a resin is injected into a cavity formed between a fixed mold and a movable mold to mold a resin molded product, and the resin molded product intersects the mold opening / closing directions of the fixed mold and the movable mold. In an injection-molded mold having a bent portion bent in the direction in which the fixed mold and the movable mold are abutted at a position deviated from the bulging end of the bent portion of the resin molded product.
The movable type is
A first movable mold portion that is moved in the detaching direction with respect to the fixed mold and is arranged ahead in the bending direction of the bent portion of the resin molded product.
A second movable part that is arranged at the position of the bent portion of the resin molded product with respect to the first movable mold portion and is separated from the first movable mold portion while holding the bent portion of the resin molded product. Mold part and
It is located between the second movable mold portion and the first movable mold portion, and is moved in the disengagement direction by a drive different from the movement of the first movable mold portion, and the second movable mold portion and the first movable mold portion and the first. An injection molding die provided with an insertion / extraction member that is inserted / removed in the space between the movable mold portion. The second movable mold portion has a first mold member on the side of the first movable mold portion and a second mold member on the opposite side of the bent portion of the resin molded product from a direction orthogonal to the contacting direction. The injection molding mold according to claim 1, wherein the first mold member and the second mold member are separately separated from the first movable mold portion. The second movable type portion is
The first mold member and the second mold member move in a direction of integrally approaching the first movable mold portion in a state where the insertion / extraction member is pulled out, the space exists, and the bent portion of the injection molded product is sandwiched. The injection molding die according to claim 2, wherein the first mold member and the second mold member are separately moved in a direction away from the first movable mold portion. The first mold member is divided into a first split mold member on the side of the first movable mold portion and a second split mold member on the opposite side, and the first split mold member and the second split mold member are separate bodies. The second split mold member is separated from the first movable mold portion after being separated from the first movable mold portion, and the second split mold member is separated from the first movable mold portion. The injection molding die according to claim 3, wherein a delay mechanism is provided.

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