JP6132927B2 - Mold for molding and manufacturing method of molded product - Google Patents

Description

The present invention relates to a method of manufacturing a mold and molded product to produce a molded product by die molding or the like of the injection molding and metal products of the resin product.

  Conventionally, when a product having a hollow portion is molded using a mold, a slide core for forming the hollow portion is provided in the pair of molds. As such a mold structure, for example, there is a die casting mold as disclosed in Patent Document 1. The die casting mold includes a fixed mold in which a fixed side cavity is formed, a movable mold in which a movable side cavity is formed facing the fixed mold, and a movable mold that is inserted into the fixed side cavity and the movable side cavity. And a pair of slide cores slidably provided in a direction perpendicular to the moving direction of the mold. The pair of slide cores are formed with insertion holes through which inclined pins for sliding so as to be extracted from the molded product are interlocked when the movable mold is opened after molding. The tilt pin has one end fixed to the movable mold and the other end inserted into the slide core insertion hole. The tilt pin and the slide core are inserted into the slide core through the mold pin opening and the tilt pin and the slide core insertion hole. A force acts so as to retract to the side, and the slide core moves in the retracting direction along the guide groove of the fixed mold.

Japanese Patent Laid-Open No. 9-285859

  In the die-casting mold disclosed in Patent Document 1, when taking out a molded product, the excess end of the metal filled in the overflow hole of the fixed mold is pushed by an extrusion pin, and the molded product is taken out from the fixed mold. Yes. When the molded product is taken out by the extrusion pin, a mark remains on the pressed portion of the product by the extrusion pin. Therefore, in the mold disclosed in Patent Document 1, the excess end portion of the overflow portion to be removed by post-processing is pushed and released. ing. However, in this case, post-processing is necessary and the production efficiency is poor.

  On the other hand, in the case of a resin molded product, the mold resin of the runner can be cut at the time of mold release at the gate part of the molded product at the time of mold release. In that case, removal of the runner etc. by post-processing is possible. Is not necessary. However, since the gate portion is formed at an inconspicuous position, it is necessary to eject the ejector pin, which is an extrusion pin, against the surface of the molded product in order to release the molded product. However, since the surface of the resin-made molded product is relatively soft, if the mold is released with the ejector pin, a pressing mark by the ejector pin remains on the surface.

The present invention has been made in view of the above-described background art, and is capable of easily and reliably releasing a molded product, and producing a mold for molding and a molded product that does not leave a trace at the time of release on the surface of the molded product. It aims to provide a method .

The present invention relates to a fixed mold provided with a fixed cavity for molding a product, and a movable mold which is driven to move forward and backward with respect to the fixed mold and is positioned opposite to the fixed mold to mold the product. A movable mold provided with a side cavity, and a slide located in a space formed by the fixed side cavity and the movable side cavity and movably provided so as to intersect the moving direction of the movable mold A molding die having a core , wherein a stopper is provided in the vicinity of a movement path of the slide core , and the stopper is disposed so as to be able to contact the product moving with the movement of the slide core, A molding die in which the product moves with the movement of the slide core, the product comes into contact with the stopper, the slide core comes out of the product, and the product is released. That.

  The stopper is preferably fixed to the movable mold. Further, the fixed mold is provided with a convex portion or a concave portion that engages with the surface of the product, and a mechanism that moves the slide core before the time when the product completely comes out of the convex portion or the concave portion. It may be what is being done.

  The movable mold may be provided with a biasing member for releasing the product from the movable mold in a state where the product is fitted to the fixed mold side.

  Further, the present invention provides a fixed mold in which a fixed cavity for forming a product is formed, and is driven so as to be movable back and forth with respect to the fixed mold, and is positioned opposite to the fixed mold to mold the product. A movable mold having a movable side cavity formed therein, and provided in a space formed by the fixed side cavity and the movable side cavity so as to be movable so as to intersect the moving direction of the movable mold. A method of manufacturing a molded product using a molding die having a slide core, the step of separating the movable die from the fixed die, and the slide in conjunction with the movement of the movable die Moving the core in a direction intersecting the moving direction of the movable mold, and moving the product together with the movement of the slide core, and moving the core to a stopper located near the movement path of the slide core. By contacting the goods is a method for producing a molded product to separate the product from the slide core.

  The slide core moves in a direction crossing the moving direction of the movable mold as the movable mold moves, and hits the product against the stopper.

  The fixed mold includes a convex portion or a concave portion that engages with the surface of the product, and the product is obtained by moving the slide core before the time when the product completely comes out of the convex portion or the concave portion. Begins to come out of the slide core, and the product moves away from the fixed die due to the movement of the movable die, and further, the product comes into contact with the stopper by the movement of the slide core and the product moves. While stopping, the slide core moves to separate the product from the slide core.

Further, the molding die and the method for producing a molded product of the present invention are applied to a resin molded product and a metal molded product.

According to the molding die and the method for producing a molded product of the present invention, the molded product can be easily and reliably released, and the surface of the molded product is not left on the surface of the molded product. As a result, a molded product having a good surface condition can be efficiently produced, and the costs of the molded product and the molding die can be suppressed.

It is the top view (a), front view (b), and AA sectional drawing (c) of the metal mold | die of 1st embodiment of this invention. It is a perspective view which shows the product shape | molded with the metal mold | die for this embodiment. It is the front view (a) at the time of mold opening of the metal mold | die of this embodiment, and AA sectional drawing (b). They are a front view (a), AA sectional view (b), a left side view (c), and a right side view (d) at the time of mold opening of the molding die of this embodiment. It is the top view (a) at the time of mold opening of the metal mold | die of this embodiment, a front view (b), and AA sectional drawing (c). It is the top view (a) at the time of mold opening of the metal mold | die of this embodiment, a front view (b), and AA sectional drawing (c). It is the top view (a), front view (b), and BB sectional drawing (c) of the metal mold | die of 2nd embodiment of this invention. It is a perspective view which shows the product shape | molded with the metal mold | die for molding of 2nd embodiment. It is BB sectional drawing (b) at the time of mold opening of the metal mold | die of 2nd embodiment. It is BB sectional drawing (b) at the time of mold opening of the metal mold | die of 2nd embodiment. It is BB sectional drawing (b) at the time of mold opening of the metal mold | die of 2nd embodiment. It is BB sectional drawing (b) at the time of mold opening of the metal mold | die of 2nd embodiment. It is a longitudinal view which shows the time of mold opening of the metal mold | die of other embodiment of this invention. It is a longitudinal cross-sectional view which shows the metal mold | die of other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 6 show a first embodiment of a molding die according to the present invention. A molding die 10 according to this embodiment is used for injection molding of a resin product, and is an injection molding machine (not shown). Connected to the injection nozzle. The product 20 molded by the molding die 10 has a hollow portion 20a as shown in FIG. 2, for example, and is integrally molded. The molding die 10 is fixed to a molding apparatus (not shown) and a stationary die 12 having a fixed cavity 12a filled with a resin for molding the product 20 is formed, and the product 20 is molded facing the stationary die 12. The movable mold 14 is provided. The movable mold 14 is formed with a movable cavity 14a, and is driven by a drive mechanism (not shown) so as to advance and retreat with respect to the fixed mold 12.

  In a space formed by the fixed cavity 12a of the fixed mold 12 and the movable cavity 14a of the movable mold 14, it can be moved by an interlocking mechanism (not shown) so as to intersect the moving direction of the movable mold 14. The slide core 16 for forming the hollow portion 20a of the product 20 is located. The interlocking mechanism of the slide core 16 may be any mechanism that can be mechanically or electrically interlocked with the drive mechanism of the movable mold 14. The slide core 16 is provided so as to be retractable from the fixed-side cavity 12a and the movable-side cavity 14a to the side surfaces 12b and 14b of the fixed mold 12 and the movable mold 14.

  The movable mold 14 is provided with a stopper 18 disposed outside the fixed side cavity 12a and the movable side cavity 14a and close to the moving path of the slide core 16. The stopper 18 is fixed to the movable mold 14 and is provided at a position where the product 20 can come into contact with the product 20 when the product 20 moves with the slide core 16 as will be described later. The portion of the stopper 18 that contacts the product 20 is a surface that is orthogonal to the moving direction of the slide core 16, and is a side surface 18 b that uniformly contacts the surface that is orthogonal to the moving direction of the product 20. Note that the side surface 18b that contacts the product 20 may be formed with a curved surface or a slope according to the shape of the contact portion of the product 20, thereby increasing the contact area with the product 20 and leaving a trace due to the contact. It becomes difficult. Here, in this embodiment, as shown in FIG. 2, the surface of the product 20 on the fixed mold 12 side is the first end surface 20b, the surface on the movable mold side is the second end surface 20c, the first end surface 20b and the second end surface. When the pair of surfaces connecting the end surfaces 20c are defined as the third end surface 20d and the fourth end surface 20e, respectively, the first end surface 20b, the third end surface 20d, and the fourth end surface 20e are in contact with the stopper 18. The mold is designed like this. The end surfaces 20b, 20c, 20d, and 20e do not need to be in contact with each other, and any one of the end surfaces may be designed to contact with the stopper 18, or the third end surface 20d and the fourth end surface may be in contact with each other. You may design so that it may contact | abut with the stopper 18 only by 2 surfaces of the end surface 20e. Further, a stopper accommodating portion 12c that accommodates the stopper 18 at the time of mold clamping is formed on the fixed mold 12 side.

  Next, the molding process and mold release method of the molding die of this embodiment will be described. First, as shown in FIG. 1, the molding die 10 is closed and clamped, and molding resin is injected into the fixed side cavity 12a and the movable side cavity 14a from an injection molding machine (not shown). The injected molding resin is filled into the fixed side cavity 12a and the movable side cavity 14a from a gate (not shown) of the movable mold 14 through a runner (not shown). The slide core 16 is located in the fixed side cavity 12a and the movable side cavity 14a, and the product 20 is molded with a hollow portion 20a.

  After the product 20 is molded in the fixed side cavity 12a and the movable side cavity 14a, first, as shown in FIG. 3, the movable mold 14 moves downward. At this time, the molding resin is cut at the gate end located on the movable mold 14 side, and the product 20 is separated from the runner. In this embodiment, an example in which the movable mold 14 moves downward in the drawing is shown. However, the moving direction of the movable mold 14 with respect to the fixed mold 12 may be relatively upward or sideward. The arrangement direction of the movable mold 14 and the mold opening direction of the movable mold 14 can be set as appropriate.

  In the state shown in FIG. 3 in which the movable mold 14 has moved slightly, the slide core 16 remains in a position fixed relative to the fixed mold 12. Therefore, the product 20 maintains the state attached to the fixed mold 12 side.

  When the movable mold 14 further moves downward, the slide core 16 comes into contact with the locking end portion 18a of the stopper 18, and the movable mold 14 further moves downward in the drawing, as shown in FIG. The slide core 16 moves downward, and the product 20 is released from the fixed cavity 12 a of the fixed mold 12 together with the slide core 16.

  Then, after the product 20 is completely removed from the fixed side cavity 12a, the slide core 16 moves from the fixed mold 12 and the movable mold 14 in the retracting direction, to the left in FIG. This moving direction is a direction orthogonal to the moving direction of the movable mold 14 with respect to the movable mold 14. Thereby, as shown in FIG. 5, the product 20 fitted to the slide core 16 moves together with the slide core 16, and the end portion of the product 20 abuts against the stopper 18.

  Then, the slide core 16 further moves in the same direction, and as shown in FIG. 6, the product 20 abutting against the stopper 18 stops at that position, and the slide core 16 further moves, so that the hollow portion 20a of the product 20 The slide core 16 begins to come off. When the slide core 16 completely comes out of the hollow portion 20a of the product 20, the product 20 that has stopped in contact with the stopper 18 falls downward, and the release operation of the product 20 is completed.

  Here, the configuration of the stopper 18 will be supplementarily described. The stopper 18 is preferably provided at a position as close as possible to the cavities 12a and 14a. This is because the product 20 can be completely withdrawn from the slide core 16 earlier, and efficient product manufacture with a short cycle time as a whole becomes possible. Therefore, in this embodiment, the stopper 18 is provided at a position adjacent to the cavities 12a and 14a only through the stopper partition walls 12d and 14d that form part of the side surfaces of the cavities 12a and 14a. Furthermore, the thickness of the stopper partition walls 12d and 14d in the direction of moving the slide core is more efficient because the product 20 can be completely removed from the slide core 16 earlier. Therefore, the thickness of the stopper partition walls 12d and 14d in the direction of moving the slide core needs to be larger than the minimum thickness allowable in the strength design as the mold, but the upper limit is the movable mold 14 It is desirable to set in a range smaller than the length corresponding to the maximum movement stroke (movement stroke from mold clamping state to mold opening completion). Further, the stopper 18 is formed in a hollow shape so that the slide core 16 can move in the moving direction of the movable mold. As described above, the hollow shape allows the molds to operate without interference even when the stopper 18 is provided as close as possible to the cavities 12a and 14a.

  The movable mold 14 and the slide core 16 of this embodiment are moved in order for each movement direction, but from the state shown in FIG. 3, the movable mold 14 is moved downward and the slide core in the drawing. The leftward movement of 16 may be performed in conjunction with each other at the same time, and the timing, direction, and speed of movement can be appropriately set in a state where each member is not buffered.

  The molding die 10 of this embodiment can be easily and reliably performed without using an ejector pin when releasing the injection-molded product 20, and the product 20 having a clean surface can be molded. In addition, a process for releasing the product 20 is not particularly required, and the product 20 is released by coming into contact with the stopper 18 during the mold opening operation, so that the work efficiency is good and the cycle time is short. Can be molded. In particular, by making the shape of the side surface 18b of the stopper 18 with which the product 20 is in contact with the shape of the contact surface of the product 20, it is possible to make it difficult for the product 20 to leave a mark at the time of release, and the surface properties are improved. It is possible to deal with mold release of the product 20 that requires delicate and more careful handling.

  Next, the molding die and its mold release method according to the second embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the above embodiment will be described with the same reference numerals. As shown in FIG. 8, the product 22 molded in this embodiment has a hollow portion 22a and a hole portion 22b penetrating the front and back surfaces, and is integrally molded. The molding die 30 according to this embodiment includes a fixed mold 12 having a fixed side cavity 12a in which a product 22 is molded by being fixed to a molding apparatus (not shown), and a movable side cavity facing the fixed mold 12. And a movable mold 14 that is driven by a drive mechanism (not shown) so as to be movable forward and backward with respect to the fixed mold 12.

  The fixed mold 12 and the movable mold 14 are respectively provided with a fixed cavity 12a and convex portions 24 and 25 protruding into the movable cavity 14a in order to form a hole 22b penetrating the surface of the product 22. ing. The protruding direction of the convex portions 24 and 25 is parallel to the moving direction of the movable mold 14 to be described later, and intersects the moving direction of the slide core 16. Other configurations are the same as those in the above-described embodiment, and the same reference numerals are given and description thereof is omitted.

  Next, the molding process and mold release method of the molding die of this embodiment will be described. First, as shown in FIG. 7, the molding die 30 is closed and clamped, and molding resin is injected into the fixed side cavity 12a and the movable side cavity 14a from an injection molding machine (not shown). The injected molding resin is filled into the fixed side cavity 12a and the movable side cavity 14a from a gate (not shown) of the movable mold 14 through a runner (not shown). The slide core 16 is located in the fixed side cavity 12a and the movable side cavity 14a, and the product 22 has a hollow portion 22a and a hole portion 22b and is molded.

  After the product 22 is molded in the fixed side cavity 12a and the movable side cavity 14a, first, as shown in FIG. 9, the movable mold 14 moves downward. At this time, the molding resin is cut at the gate end located on the movable mold 14 side, and the product 22 is separated from the runner. In the state shown in FIG. 9 in which the movable mold 14 has moved slightly, the slide core 16 remains in a position fixed relative to the fixed mold 12.

  Thereafter, as shown in FIG. 10, the movable mold 14 is moved downward and the slide core 16 is moved leftward in the drawing. At this time, the product 22 is locked to the convex portion 24 of the fixed mold 12 and does not move in the moving direction of the slide core 16 but stays on the fixed mold 12 side. Thereby, the slide core 16 starts to come off from the product 22. In this way, the place where the slide core 16 is moved and the close contact state between the slide core 16 and the product 22 is separated before the time when the product 22 completely comes out of the convex portion 24 of the fixed mold 12 is different from that of the first embodiment. Is different. Such an interlocking drive mechanism itself is a well-known technique as a mold drive mechanism, and is not particularly described in detail in this specification. For example, it is provided in a movable mold as described in Patent Document 1. The mechanical interlocking with the inclined pins can be used. It should be noted that an appropriate gap may be provided between the inclined pin and the mold, and the drive timing may be set as appropriate. Further, an interlocking mechanism controlled electrically, mechanically, or hydraulically and pneumatically may be used.

  Further, when the movable mold 14 moves downward, the hole 22b of the product 22 is released from the engagement with the convex part 24 of the fixed mold 12, as shown in FIG. As a result, the product 22 once ceases to move out of the slide core 16, the slide core 16 and the product 22 both move to the left in the drawing, and the product 22 contacts the side surface 18 b of the stopper 18 by the movement of the slide core 16.

  In this state, the movable core 14 is further moved downward in the drawing, and the slide core 16 is also moved to the left in the drawing, whereby the slide core 16 is further removed from the product 22 as shown in FIG. Then, when the slide core 16 is completely removed from the hollow portion 22a of the product 22, the product 20 that has been stopped in contact with the stopper 18 falls downward, and the release operation of the product 225 is completed.

  The molding die 30 of this embodiment has the same effect as that of the above-described embodiment when releasing the injection-molded product 22 and also releases the movable mold 14 and the slide core 16 simultaneously. Therefore, it is possible to perform molding with higher work efficiency and shorter cycle time.

  Furthermore, in this embodiment, as described above, in the state shown in FIG. 10, the slide core 16 is moved to move the slide core 16 before the product 22 completely comes out of the convex portion 24 of the fixed mold 12. Since the contact state with the product 22 is separated, the following effects are also obtained. That is, when the slide core 16 and the product 22 are too close to be separated, if the separation is performed only by the contact between the side surface 18b of the stopper 18 and the product 22, an excessive force is applied thereto, and the product 22 May be deformed or scratched. In particular, when the area of the portion of the product 22 that contacts the side surface 18b of the stopper is small and the design portion is weak in strength, the product 22 is easily affected. In that regard, as in the second embodiment, if the separation force is received by a relatively strong design portion called an engagement portion between the convex portion 24 of the fixed mold 12 and the hole portion 22b of the product 22. The product 22 is not easily deformed or damaged.

  In addition, the convex part 24 or recessed part engaged with the surface of the product 22 said by this invention is not necessarily limited to the thing of said 2nd embodiment, The convex part engaged with the surface of the product 22 literally Or what kind of shape may be sufficient if it is a recessed part. For example, even in the structure of the fixed mold 12 of the first embodiment, as shown in FIG. 13, the engagement portion such as the end engagement portion 19 protruding into the fixed side cavity 12 a of the fixed mold 12 is provided. It is also possible to move the slide core 16 so as to separate the contact state between the slide core 16 and the product 22 before the product 22 is completely removed from the end engaging portion 19 or the like. is there. In this case, the engaging portion such as the end engaging portion 19 corresponds to a convex portion or a concave portion that engages with the surface of the product in the present invention.

  The molding die according to the present invention is not limited to the above embodiment. For example, as shown in FIG. 14, the product 20 to which the slide core 16 is fitted as the movable die 14 moves is surely movable. A spring member 26 that is an urging member that pushes and separates the slide core 16 or a member to which the slide core 16 is fixed from the movable mold 14 side may be provided so as to be released from the mold 14. As a result, when the first movable mold 14 is moved, the product 20 can be reliably released from the movable mold 14 regardless of play in the movement direction between the members.

  The molding die of the present invention is applicable to die casting of metal products as well as molding of resin products.

  Furthermore, the stopper according to the present invention is only required to be able to come out of the slide core with the product coming into contact with the movement of the slide core, and is preferably provided in the movable mold, but it is not fixed to the fixed mold or other members. It may be provided. The hole on the surface of the product into which the convex part of the fixed mold fits may be uneven or stepped on the surface other than the hole, and the concave mold other than the convex part is provided on the fixed mold on which the product engages. It may be what you have. Further, the number of cavities and slide cores provided in the molding die can be set as appropriate, and the interlocking mechanism between the movable die and the slide core is also a well-known movable die as described in Patent Document 1. In addition to mechanical interlocking by the inclined pin provided in the motor, an interlocking mechanism controlled electrically, mechanically, or hydraulically or pneumatically may be used.

10, 30 Molding mold 12 Fixed mold 12a Fixed side cavity 14 Movable mold 14a Movable side cavity 16 Slide core 18 Stopper 20, 22 Product 20a, 22a Hollow part

Claims (7)

A fixed mold (12) provided with a fixed cavity (12a) in which a product (20, 22) is molded, and the fixed mold (12) driven to be movable back and forth with respect to the fixed mold (12). A movable mold (14) provided with a movable cavity (14a) that is positioned opposite to the molded product (20, 22), the fixed cavity (12a), and the movable cavity (14a). A molding die (10, 30) provided with a slide core (16) which is located in the space formed by and is movably provided so as to intersect with the moving direction of the movable die (14). In
A stopper (18) is provided in the vicinity of the moving path of the slide core (16) ,
The stopper (18) is disposed so as to be able to contact the product (20, 22) moving with the movement of the slide core (16),
The product (20, 22) moves with the movement of the slide core (16), the product (20, 22) comes into contact with the stopper (18), and the slide core (16) is moved to the product (20, 22). ) And the product (20, 22) is released from the mold.   The molding die according to claim 1, wherein the stopper (18) is fixed to the movable die (14).   The fixed mold (12) has a convex portion (24) or a concave portion that engages with the surface of the product (22), and the product (20, 22) completely comes out of the convex portion (24) or the concave portion. The molding die according to claim 1, further comprising a mechanism for moving the slide core (16) before the time point.   In the movable mold (14), the product (20, 22) is separated from the movable mold (14) in a state where the product (20, 22) is fitted to the fixed mold (12). The molding die according to claim 1, further comprising an urging member (26) for molding. A fixed mold (12) formed with a fixed cavity (12a) in which a product (20, 22) is formed, and the fixed mold (12) driven to be movable forward and backward with respect to the fixed mold (12). A movable mold (14) in which a movable cavity (14a) in which the product (20, 22) is molded is formed, the fixed cavity (12a), and the movable cavity (14a). A molding die (10, 30) provided with a slide core (16) provided in a space formed by the movable die (14) so as to be movable so as to intersect the moving direction of the movable die (14). In a method of manufacturing a molded product using
The step of moving the movable mold (14) away from the fixed mold (12), and the movement of the movable mold (14) moves the slide core (16) by moving the movable mold (14). Moving the product (20) along with the movement of the slide core (16) and moving the product (20) to the stopper (18) located near the movement path of the slide core (16). A method of manufacturing a molded product, wherein the product (20, 22) is brought into contact with the slide core (16) to separate the product (20, 22).   The slide core (16) moves in a direction intersecting the moving direction of the movable mold (14) with the movement of the movable mold (14), and the product (20, 22) is moved to the stopper (18). 6. A method for producing a molded product according to claim 5.   The fixed mold (12) includes a convex portion (24) or a concave portion that engages with the surface of the product (22), and the product (20, 22) is completely removed from the convex portion (24) or the concave portion. The product (22) starts to come out of the slide core (16) by moving the slide core (16) before the time of withdrawal, and the product (22) is moved by moving the movable mold (14). After moving away from the fixed mold (12), the product (20, 22) comes into contact with the stopper (18) by the movement of the slide core (16) and the movement of the product (22) is stopped. The method of manufacturing a molded product according to claim 5, wherein the slide core (16) is moved together to separate the product (22) from the slide core (16).

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