JP2012061827A - Injection molding die and injection molding machine, and injection molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding die and an injection molding machine, and an injection molding method in which a runner can be removed during the mold opening after forming a molded article, and the molding can be automated.SOLUTION: The injection molding die includes: a runner holding plate 12 which is interposed between a fixed mounting plate 11 and a fixed mold template 13 of a fixed mold 2, supported movably in the advancing/separating direction to/from the fixed mounting plate 11, and has a runner connection part 12b for connecting a cold runner 25 formed in a runner groove 26 of the fixed mold template 13; and a release mechanism 51 for releasing the connection between the cold runner 25 and the runner connection part 12b by moving the runner holding plate 12 in the separating direction from the fixed mounting plate 11 interlockingly with the operation of projecting a projecting plate 16 to the fixed mold 2 side while a movable mold 3 is moved to the mold-opening position with respect to the fixed mold 2.

Description

  The present invention relates to an injection mold, an injection molding machine, and an injection molding method using the injection mold.

  A semi-hot runner mold is generally known as a mold for injection molding. The semi-hot runner is a primary sprue of a cold runner, and a portion corresponding to the primary runner is used as a hot runner to keep the resin material in a molten state. In this state, by supplying a resin material to a portion corresponding to the secondary runner of the cold runner, the waste material can be reduced and the cycle time can be shortened as compared with the cold runner.

  For example, there is a resin ferrule molding die disclosed in Patent Document 1. This molding die has a hot chip type fixed die and a resin supply part that opens to the parting surface of a molding die of a resin ferrule having a cavity for forming a molded product and supplies the resin in a molten state. A first movable mold that also serves as a runner holding plate on which the runner is formed; and a second movable mold that cooperates with the first movable mold to form a cavity. A gate for allowing the resin to flow into the cavity is formed as a pin gate.

JP 2005-161793 A

  In Patent Document 1, after molding a molded product by injecting resin into the cavity, the molded product is separated from the cavity by separating the second movable mold from the first movable mold. At this time, the runner remaining in the first movable mold is separated from the molded product on the second movable mold side at the pin gate portion. Thereafter, the first movable mold is pulled in the direction of the second movable mold, whereby the first movable mold is separated from the fixed mold. With this mechanism, the runner is released from the connection portion with the fixed mold.

  However, since the semi-hot runner has no primary sprue due to its structure, when the runner is released from the connection portion with the fixed mold, the runner is not held in the fixed mold. Therefore, conventionally, the runner falls from the fixed mold under its own weight during mold opening. There is a problem that it is difficult to perform the operation of removing the dropped runner, for example, with a robot, and it is difficult to automate.

  The present invention has been made paying attention to the above circumstances, and the purpose thereof is an injection mold, an injection molding machine, and injection molding capable of preventing the runner from falling during mold opening after molding a molded product. It is to provide a method.

  The first aspect of the present invention is moved to a fixed mold, a mold closing position that is supported so as to be movable toward and away from the fixed mold, and is joined to the fixed mold, and a mold open position that is separated from the fixed mold. A movable mold that is supported, and a release mechanism that releases a connection between a runner coupling portion that is continuous from the cold runner and a runner lock member that is coupled to the runner coupling portion. A movable mold plate having a cavity for molding the movable mold plate, a movable mounting plate for holding the movable mold plate, and supported so as to protrude toward the fixed mold side with respect to the movable mounting plate, and directed toward the fixed mold side. A projecting plate for projecting a molded product in the cavity out of the cavity by a projecting operation, and the fixed mold has a fixed mounting plate having a hot runner manifold, and one end of the fixed mounting plate. Fixed, A guide shaft having an end extending toward the movable mold side, the runner lock member having one end fixed to the fixed mounting plate, and supported to be movable along the guide shaft, and the cold runner A fixed mold plate having runner grooves, and a runner holding plate interposed between the fixed mounting plate and the fixed mold plate and supported so as to be movable along the guide shaft, The release mechanism moves the movable mold to the mold opening position with respect to the fixed mold and then fixes the runner holding plate in conjunction with an operation of projecting the protruding plate toward the fixed mold side. It is an injection mold which is moved in a direction away from the mounting plate to release the connection between the runner connecting portion and the runner lock member.

  According to a second aspect of the present invention, in the injection mold according to the first aspect, the molten resin is solidified around the end portion of the runner lock member when the runner connection portion and the runner lock member are connected. It is an injection mold performed by doing.

  According to a third aspect of the present invention, in the injection mold according to the second aspect, the runner connecting portion has a tapered portion that extends toward the fixed mold plate, and the tip of the runner lock member is This is an injection mold having a runner lock taper portion extending toward the fixed mold plate.

  According to a fourth aspect of the present invention, in the injection mold according to the first aspect, the release mechanism includes a link mechanism, and the link mechanism is directly or indirectly connected to the runner holding plate. A link, and a lever shaft having one end connected to the protruding plate and the other end connected to the link, and the fulcrum of the lever shaft is fixed so as not to move relative to the movable plate. It is an injection mold.

  A fifth aspect according to the present invention is an injection mold according to the injection mold according to the first aspect, wherein the release mechanism includes a link mechanism having a power transmission part of a rack and pinion.

  According to a sixth aspect of the present invention, in the injection mold according to the first aspect, after the mold opening between the fixed mold plate and the movable mold plate is completed, the mold is arranged around the injection mold. An injection molding machine having runner fall prevention means for holding the cold runner before releasing the connection between the runner connecting portion and the runner lock member.

  According to a seventh aspect of the present invention, in a state in which the space between the fixed mold plate and the movable mold plate is closed, a molten material is injected into the cavity sequentially through the hot runner manifold and the cold runner to obtain a molded product. A step of performing injection molding, a step of performing mold opening between the fixed mold plate and the movable mold plate, and then projecting the plate in the direction of the fixed mold plate by an ejection mechanism of an injection molding machine. The step of projecting the molded product from the cavity and driving the link mechanism in conjunction with the operation of ejecting the molded product to connect the runner coupling part continuous from the cold runner and the runner lock member. And holding the cold runner by runner fall prevention means arranged around the injection mold before release.

  According to the present invention, it is possible to provide an injection mold, an injection molding machine, and an injection molding method in which a runner can be removed during mold opening after molding a molded product, and molding can be automated.

The side view which shows the external appearance of the whole of the state by which the injection mold of the 1st Embodiment of this invention is hold | maintained at the mold closing position. The longitudinal cross-sectional view which shows the state by which the injection mold of 1st Embodiment is hold | maintained in the mold closing position. The longitudinal cross-sectional view of the principal part which shows the state by which the cold runner is connected with the drop-off prevention part of the front-end | tip of the runner lock pin of the runner holding plate in the injection mold of 1st Embodiment. The longitudinal cross-sectional view of the principal part which expands and shows the part of the drop-off prevention part of the front-end | tip of the runner lock pin in the injection mold of 1st Embodiment. The side view which shows the external appearance of the whole injection mold for demonstrating a motion of the link mechanism of the state which the injection mold of 1st Embodiment moved to the mold opening position. The longitudinal section of the injection mold in the state where the injection mold of a 1st embodiment moved to the mold opening position. The side view which shows the whole external appearance of the state which protruded in the mold opening position of the injection mold of 1st Embodiment, and the board slid to the direction of the fixed mold | type. The longitudinal cross-sectional view of the injection mold which shows the state which the injection mold of 1st Embodiment protruded in the mold opening position, and the board slid to the direction of the fixed mold. The side view which shows the external appearance of the whole state of the state by which the injection mold of the 2nd Embodiment of this invention is hold | maintained in the mold closing position. The side view which shows the whole external appearance of the state which the injection mold of 2nd Embodiment moved to the mold opening position. The side view which shows the whole external appearance of the state which the injection mold of 2nd Embodiment protruded in the mold opening position, and the board slid to the direction of the fixed mold.

[First Embodiment]
(Constitution)
1 to 8 show a first embodiment of the present invention. 1, 5 and 7 are external views of the injection mold 1 according to the first embodiment. FIG. 1 is when the mold is closed, FIG. 5 is when the mold opening is completed, and FIG. It shows the time of operation of the ejection mechanism of the molding machine. 2, 6, and 8 are longitudinal sectional views of the injection mold 1 according to the first embodiment. The internal structure of the injection mold 1 is common in each embodiment of the present invention. 2 shows when the mold is closed, FIG. 6 shows when the mold opening is completed, and FIG. 8 shows when the eject mechanism of the injection molding machine is operated.

The injection mold 1 in the present embodiment has a fixed mold 2 and a movable mold 3. The movable mold 3 is supported to be movable toward and away from the fixed mold 2, and is supported to be movable between a mold closing position joined to the fixed mold 2 and a mold opening position separated from the fixed mold 2. Yes.
As shown in FIG. 1, the fixed mold 2 mainly includes a fixed mounting plate 11, a runner holding plate 12, and a fixed mold plate 13. The movable mold 3 mainly includes a movable mold plate 14, a protruding plate 16, and a movable mounting plate 17.

  As shown in FIG. 2, the fixed mounting plate 11 of the fixed mold 2 is provided with a manifold 22 of a hot runner 23 at the center. A shoulder bolt (guide shaft) 31 is disposed outside the manifold 22. One end of the shoulder bolt 31 is fixed to the fixed mounting plate 11 and the other end is extended toward the movable mold 3 side.

  In the manifold 22, the molten resin material is supplied to one resin material inflow path 22 a provided in the sprue bush 21 connected to the molten resin material supply unit 101 and a cavity 28 for molding a molded product 27 described later. Two resin material outflow passages 22b are formed. The base end portions of the two resin material outflow passages 22b are connected to the distal end portion of the resin material inflow passage 22a. The tip portions of the two resin material outflow paths 22b are extended to a position corresponding to the tip surface of the runner holding plate 12. A hot runner 23 is formed by one resin material inflow passage 22 a and two resin material outflow passages 22 b of the manifold 22.

  The fixed mold plate 13 is supported so as to be movable along the shoulder bolt 31 in a direction in which the fixed mold plate 13 contacts and separates from the fixed mounting plate 11. Here, the fixed mold plate 13 is in contact with the runner holding plate 12 as shown in FIGS. 1 and 2, and is in contact with the stopper 31a at the tip of the shoulder bolt 31 as shown in FIGS. It is possible to move between. Further, the fixed mold 13 is provided with two runner grooves 26 for molding the two cold runners 25.

  In addition, a runner holding plate 12 is provided between the fixed mounting plate 11 and the fixed mold plate 13 so as to be movable along the shoulder bolt 31 in a direction in which the fixed mounting plate 11 is moved toward and away from the fixed mounting plate 11. Has been. The runner holding plate 12 is formed with an engaging recess 12 a that is detachably engaged with the manifold 22 on the surface facing the fixed mounting plate 11. The runner holding plate 12 is separated from the standby position (non-operating position) joined to the fixed mounting plate 11 as shown in FIGS. 5 and 6 and the fixed mounting plate 11 as shown in FIGS. 7 and 8. It is possible to move between the operating positions. At the standby position where the runner holding plate 12 is joined to the fixed mounting plate 11, the manifold 22 is held in the engaging recess 12a so as to be detachably engaged.

  A plurality of runner lock pins 30 (an example of a runner lock member) are inserted into the runner holding plate 12. As shown in FIG. 3, the base end portion of the runner lock pin 30 is fixed to the fixed mounting plate 11. The end of the runner lock pin 30 is coupled to a recessed runner coupling portion 12 b formed on the runner holding plate 12 on the side of the joint surface with the fixed mold plate 13. The runner coupling portion 12 b of the runner holding plate 12 is formed in a state communicating with a part of the runner groove 26 of the fixed mold plate 13.

  For example, as shown in FIG. 4, the runner coupling portion 12 b has a tapered portion 12 c that expands toward the fixed mold plate 13, and the runner lock pin 30 has a runner lock tapered portion 12 d that also expands toward the fixed mold plate 13. Have. Therefore, the molten resin covers the runner lock taper portion 12d at the tip of the runner lock pin 30, and when the resin is solidified, the cold runner 25 is caught by the runner lock pin 30 and locked. Thereby, the cold runner 25 formed in the runner groove 26 of the fixed mold plate 13 is held in a state of being connected to the runner connecting portion 12 b of the runner holding plate 12. In addition, the shape of the front-end | tip of the runner connection part 12b and the runner lock pin 30 is not limited to the taper shape mentioned above, For example, a hook shape may be sufficient.

  The movable mold plate 14 of the movable mold 3 has a plurality of, for example, two cavities 28 for molding the molded product 27. Correspondingly, the two runner grooves 26 of the stationary mold 13 are arranged at positions corresponding to the cavities 28, respectively. Then, the two cavities 28 of the movable mold plate 14 communicate with the two runner grooves 26 of the fixed mold plate 13 in a state where the movable mold 3 is moved to the mold closing position with the fixed mold 2 as shown in FIG. It has come to be. Thereby, in the injection mold 1 of this Embodiment, the two molded products 27 are simultaneously injection-molded at the time of one injection molding.

The movable mounting plate 17 holds the movable mold plate 14. Here, the movable mounting plate 17 is supported so as to be able to project toward the fixed mold 2 side, and the projecting plate projects the molded product 27 in the cavity 28 out of the cavity 28 by a projecting operation toward the fixed mold 2 side. 16 is provided.
In addition, a spacer block 15 is provided between the movable mold plate 14 and the movable mounting plate 17 to ensure the movement stroke of the protruding plate 16 and also serves as a movement guide for the protruding plate 16. The protruding plate 16 is guided by the spacer block 15 and is held in a state of being in contact with the movable mounting plate 17 as shown in FIG. 6, for example, as shown in FIG. It is movable within the range of the movement stroke between the operation position where it abuts against the movable mold plate 14.

  In addition, two eject pins 29 are projected from the protruding plate 16. These eject pins 29 are arranged at positions corresponding to the two cavities 28 of the movable mold 14. The movable mold plate 14 is formed with two pin insertion holes 14a through which the eject pins 29 are inserted. Each pin insertion hole 14 a communicates with the center position of each cavity 28.

  A hole 17a into which the push rod 18a of the eject mechanism 18 of the molding machine is inserted is formed at the center position of the movable mounting plate 17. The hole 17 a is disposed at a position corresponding to the protruding plate 16. Then, the protruding plate 16 at the standby position is pushed to the right in FIG. 6 by the movement of the push rod 18a of the eject mechanism 18 to the right in FIG. 6 along the hole 17a. At this time, the two eject pins 29 operate together with the protruding plate 16 so as to protrude along the pin insertion hole 14 a and move in the moving direction of the plate 16. As a result, the molded product 27 in the cavity 28 is projected out of the cavity 28 by the movement of the protruding plate 16 to the operating position in contact with the movable mold plate 14 as shown in FIG.

  Further, in the injection mold 1 of the present embodiment, a release mechanism 51 that releases the connection between the runner connecting portion 12b of the runner holding plate 12 that is continuous with the cold runner 25 and the runner lock pin 30 is provided. . The release mechanism 51 fixes the runner holding plate 12 in conjunction with the operation of projecting the protruding plate 16 toward the fixed mold 2 while the movable mold 3 is moved to the mold opening position with respect to the fixed mold 2. A link mechanism 52 that moves in a direction away from the mounting plate 11 is provided.

  FIG. 1 shows an example of a link mechanism 52 assembled to the injection mold 1 of the present embodiment. In the present embodiment, an example in which two sets of link mechanisms 52 are used is shown. Since the two sets of link mechanisms 52 have the same configuration, only the configuration of one link mechanism 52 will be described here. The link mechanism 52 includes two links (a fixed link 41 and a movable link 42) extending along the mold opening / closing direction of the movable mold 3 of the injection mold 1, and between the movable link 42 and the protruding plate 16. And a lever shaft 43 for connecting the two.

  Here, the first link fixing pin 53 is fixed to the runner holding plate 12. A second link fixing pin 54 and a third link fixing pin 55 are fixed to the fixed template 13. The fixed link 41 is connected to the first link fixing pin 53 and the second link fixing pin 54 so as to be movable along the mold opening / closing direction of the movable mold 3. Thereby, the fixed link 41 connects the fixed mold plate 13 and the runner holding plate 12. 7, the first link fixing pin 53 moves to one end of the fixed link 41 and the second link fixing pin 54 moves to the other end of the fixed link 41. The maximum stroke of the movement distance between the plate 13 is restricted.

  One end side of the movable link 42 is connected to the third link fixing pin 55 of the fixed mold plate 13 so as to be movable along the mold opening / closing direction of the movable mold 3. The other end of the movable link 42 is connected to one end of the lever shaft 43 via a connecting pin 58 so as to be rotatable and movable along the mold opening / closing direction of the movable mold 3.

  Further, the central portion of the lever shaft 43 is rotatably connected to the spacer block 15 via a fulcrum 47. Accordingly, the lever shaft 43 is fixed so as not to move relative to the movable mold plate 14. The other end of the lever shaft 43 is rotatably connected to the protruding plate 16 via a fourth link fixing pin 57.

  When the molded product 27 in the cavity 28 is projected outside the cavity 28 by the projecting plate 16, the link mechanism 52 of the release mechanism 51 is interlocked with the operation of projecting the projecting plate 16 toward the fixed mold 2. The runner holding plate 12 is moved away from the fixed mounting plate 11. Thereby, the connection between the runner connecting portion 12b and the runner lock pin 30 is released as the runner holding plate 12 moves.

Further, around the injection mold 1 in the present embodiment, a robot arm 48 (an example of a runner fall prevention means) that holds (holds) the cold runner 25 when the mold is opened is disposed. A grip portion 48 a capable of gripping the cold runner 25 is formed at the tip of the robot arm 48. The injection molding machine in the present embodiment includes the robot arm 48 and the injection mold 1.
(Function)
Next, the operation of the above configuration will be described. When the injection mold 1 of the present embodiment is used, first, the fixed mold 2 and the movable mold 3 of the injection mold 1 are set at the mold closing position shown in FIGS. In this state, the molten resin from the injection molding machine is injected into the injection mold 1 from the molten resin material supply unit 101 of the injection mold 1.

  Here, the molten resin flows from the sprue bush 21 into one resin material inflow path 22 a of the hot runner manifold 22. Subsequently, in a state of being branched into the two resin material outflow paths 22b, the cavity 23 is filled from the nozzle 23a of the hot runner 23 at the tip of the two resin material outflow paths 22b through the runner groove 26 of the fixed mold plate 13. Is done. Thereby, the molten resin filled in the cavity 28 is cooled, and the molded product 27 is formed.

  When the molten resin is filled into the cavity 28, a part of the melted resin is filled into the recessed runner coupling portion 12b of the joint surface of the runner holding plate 12 with the fixed mold plate 13 at the same time. Therefore, when the molten resin is cooled and solidified, the cold runner 25 in the runner groove 26 of the fixed mold 13 and the filled resin in the runner connecting portion 12b are solidified while being connected. Since the runner connecting portion 12b is shaped to cover the runner lock taper portion 12d, the cold runner 25 is prevented from falling off the runner holding plate 12, and the cold runner 25 is locked to the runner lock pin 30.

  When the resin in the cavity 28 is cooled and solidification is completed, mold opening is started. When mold opening is started in which the movable mold 3 moves away from the fixed mold 2, first, the runner holding plate 12 and the fixed mold plate 13 are opened by a spring (not shown) to separate the molded product 27 and the cold runner 25. . At this time, the fixed mold 13 slides in the direction of the movable mold 3 and opens between the runner holding plate 12. When the runner holding plate 12 and the fixed mold plate 13 are opened, the cold runner 25 is held by the runner holding plate 12 by the action of the runner lock pin 30 fixed to the fixed mounting plate 11.

Next, the movable mold plate 14 of the movable mold 3 is further slid in the mold opening direction to open the space between the movable mold plate 14 and the fixed mold plate 13, and the mold opening completion state shown in FIGS. At this time, the movable link 42 and the fixed link 41 are stationary with no slack.
Thereafter, the eject mechanism 18 of the molding machine operates, and the push rod 18a of the eject mechanism 18 protrudes and presses the plate 16 in the pushing direction. Therefore, the protruding plate 16 slides in the direction of the fixed mold 2 (right direction in FIGS. 5 and 6). At this time, the two eject pins 29 of the protruding plate 16 project the molded product 27 in the cavity 28 shown in FIG. 7 and FIG. The link mechanism 52 of the release mechanism 51 operates as follows in conjunction with the operation of the protruding plate 16.

  That is, one end of the lever shaft 43 fixed to the protruding plate 16 also moves in the direction of the fixed mold 2 along with the protruding operation of the protruding plate 16. At this time, the lever shaft 43 rotates about the fulcrum 47 to slide the movable link 42 fixed to the other end in the direction of the movable mounting plate 17 (leftward in FIG. 7).

  Further, when the movable link 42 slides in the direction of the movable mounting plate 17, the fixed mold plate 13 is pulled in the direction of the movable mold 3 as indicated by an arrow in FIG. 7. With the movement of the fixed mold 13, the runner holding plate 12 is pulled in the direction of the movable mold 3 through the fixed link 41 and slid in the direction of the movable mold 3. Since the cold runner 25 is formed between the runner holding plate 12 and the fixed mold plate 13, when the runner holding plate 12 slides in the direction of the movable mold 3, the runner connecting portion 12 b continuous from the cold runner 25 The connection with the runner lock pin 30 is disconnected. Thereby, the cold runner 25 comes off from the tip of the runner lock pin 30, and the cold runner 25 is released.

By the release mechanism 51, the movement of the protruding plate 16 to project the molded product 27 through the eject pin 29 and the movement of the runner lock pin 30 to release the cold runner 25 are simultaneously performed.
Further, since the ejection mechanism 18 of the molding machine is operated after the mold opening is completed, the robot arm 48 can grasp the cold runner 25 before the cold runner 25 falls.

(effect)
Therefore, the above configuration has the following effects. That is, the injection mold 1 of the present embodiment is provided with a release mechanism 51 that releases the cold runner 25 from the tip of the runner lock pin 30 in conjunction with the operation of the protruding plate 16. Therefore, the robot arm 48 can grasp the cold runner 25 before the cold runner 25 falls.

  With this release mechanism 51, the cold runner 25 can be reliably taken out even in a semi-hot runner having no primary sprue and primary runner, and the molding can be automated. Therefore, in the injection mold 1 of the present embodiment, there is provided an injection mold and an injection molding method in which the cold runner 25 can be removed during mold opening after the molded product 27 is molded, and the molding can be automated. Can be provided.

In this embodiment, the runner holding plate 12 and the fixed mold plate 14 are connected by the fixed link 41. However, the present invention is not limited to this, and a plastic bolt may be adopted.
[Second Embodiment]
(Constitution)
9 to 11 show a second embodiment of the present invention. In this embodiment, a release mechanism 51 that releases the connection between the cold runner 25 of the injection mold 1 of the first embodiment (see FIGS. 1 to 8) and the runner connecting portion 12b of the runner holding plate 12. It is the modification which changed the structure of as follows. FIG. 9 shows when the injection mold 1 is closed, FIG. 10 shows when the mold opening of the injection mold 1 is completed, and FIG. 8 shows the operation of the eject mechanism of the injection molding machine. In FIG. 9 to FIG. 11, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, the release mechanism 61 of the present embodiment includes a link mechanism 63 having a rack and pinion power transmission unit 62. Here, the link mechanism 63 includes a fixed link 41 having the same configuration as that of the first embodiment and a movable link 64 having a configuration different from that of the first embodiment. In the present embodiment, an example in which two sets of link mechanisms 63 are used is shown. Since the two sets of link mechanisms 63 have the same configuration, only the configuration of one link mechanism 63 will be described here.

  The movable link 64 of the present embodiment has a movable rack 44, a pinion 45, and a protruding rack 46 that constitute a power transmission unit 62 of a rack and pinion. The protruding rack 46 has a rack body 46a. The base end portion (left end portion in FIG. 9) of the rack body 46 a of the protruding rack 46 is fixed to the protruding plate 16. A first rack portion 71 that meshes with the pinion 45 is formed at the tip end portion (the right end portion in FIG. 9) of the rack body 46a.

  The movable rack 44 has a rack body 44a. The base end (right end in FIG. 9) of the rack main body 44a of the movable rack 44 is connected to the fixed pin 56 protruding from the fixed mold plate 13 so as to be movable along the mold opening / closing direction of the movable mold 3. Has been. A second rack portion 72 that meshes with the pinion 45 is formed at the tip end portion (left end portion in FIG. 9) of the rack body 44a.

  The pinion 45 is rotatably supported around a support shaft 45a fixed at a position where it does not move relative to the movable mold plate 14. Further, the pinion 45 is connected in a state where one surface side is engaged with the second rack portion 72 of the movable rack 44, the opposite side protrudes and is engaged with the first rack portion 71 of the rack 46.

(Function)
Next, the operation of the above configuration will be described. When the injection mold 1 of the present embodiment is used, the molten resin enters the cavity 28 in a state where the fixed mold 2 of the injection mold 1 and the movable mold 3 are set at the mold closing position (see FIG. 9). By filling, the molten resin filled in the cavity 28 is cooled and the molded product 27 is formed. After the molded product 27 is molded, the movable mold plate 14 of the movable mold 3 is opened. The process until the movable mold plate 14 and the fixed mold plate 13 are slid in the direction and the mold opening completion state shown in FIG. 10 is reached is the same as that of the first embodiment. When the mold opening is completed, the movable link 64 and the fixed link 41 are stationary with no slack.

  Thereafter, the ejecting mechanism 18 of the molding machine operates, and the push rod 18a (see FIG. 8) of the ejecting mechanism 18 protrudes and pushes the plate 16 in the pushing direction. Therefore, the protruding plate 16 slides in the direction of the fixed mold 2 (right direction in FIG. 11). At this time, the two eject pins 29 of the projecting plate 16 project the molded product 27 in the cavity 28 shown in FIG. The link mechanism 63 of the release mechanism 61 operates as follows in conjunction with the operation of the protruding plate 16.

That is, as the protruding plate 16 protrudes, the protruding rack 46 fixed to the protruding plate 16 slides in the direction of the fixed mold 2, and the pinion 45 rotates to slide the movable rack 44 in the direction of the movable mold 3.
When the movable rack 44 slides in the direction of the movable mold 3, the fixed mold plate 13 is pulled in the direction of the movable mold 3. With the movement of the fixed mold 13, the runner holding plate 12 is pulled in the direction of the movable mold 3 through the fixed link 41 and slid in the direction of the movable mold 3.

  Since the cold runner 25 is formed between the runner holding plate 12 and the fixed mold plate 13, when the runner holding plate 12 slides in the direction of the movable mold 3, the runner coupling portion 12 b continuous from the cold runner 25 and the runner lock are formed. The connection with the pin 30 is disconnected. Thereby, the cold runner 25 comes off from the tip of the runner lock pin 30, and the cold runner 25 is released.

By this release mechanism 61, the movement of the protruding plate 16 to protrude the molded product 27 through the eject pin 29 and the movement of the runner lock pin 30 to release the cold runner 25 are simultaneously performed.
Further, since the ejection mechanism 18 of the molding machine is operated after the mold opening is completed, the robot arm 48 can grasp the cold runner 25 before the cold runner 25 falls.

(effect)
Therefore, in the injection mold 1 of the present embodiment, by connecting the protruding plate 16 and the runner holding plate 12 by the link mechanism 63, the protruding plate 16 and the runner holding plate 12 operate in conjunction with each other, and the protruding plate 16 A release mechanism 61 that releases the cold runner 25 from the tip of the runner lock pin 30 in conjunction with the operation is provided. The protruding plate 16 is actuated by an ejecting mechanism 18 of the molding machine, and the ejecting mechanism 18 of the molding machine is actuated after the mold opening is completed. At this time, since the robot arm 48 can be placed between the injection molds 1, the robot arm 48 can grip the cold runner 25 when the runner lock pin 30 releases the cold runner 25. Therefore, the robot arm 48 can grasp the cold runner 25 before the cold runner 25 falls.

  With this release mechanism 61, the cold runner 25 can be reliably taken out even in a semi-hot runner having no primary sprue and primary runner, and the molding can be automated. Therefore, in the injection mold 1 of the present embodiment, there is provided an injection mold and an injection molding method in which the cold runner 25 can be removed during mold opening after the molded product 27 is molded, and the molding can be automated. Can be provided.

In this embodiment, the runner holding plate 12 and the fixed mold plate 14 are connected by the fixed link 41. However, the present invention is not limited to this, and a plastic bolt may be adopted.
Furthermore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  The present invention is effective in a technical field using an injection mold and an injection molding method using the injection mold, and a technical field for manufacturing the same.

    2 ... fixed type, 3 ... movable type, 11 ... fixed mounting plate, 12 ... runner holding plate, 12b ... runner connecting part, 13 ... fixed type plate, 14 ... movable type plate, 16 ... protruding plate, 17 ... movable mounting plate , 22 ... manifold, 23 ... hot runner, 25 ... cold runner, 26 ... runner groove, 27 ... molded product, 28 ... cavity, 31 ... shoulder bolt (guide shaft), 51 ... release mechanism.

Claims (7)

Fixed type,
A movable mold supported so as to be movable toward and away from the fixed mold, and movably supported between a mold closing position joined to the fixed mold and a mold opening position separated from the fixed mold;
A release mechanism that releases a connection between a runner connecting portion continuous from the cold runner and a runner lock member connected to the runner connecting portion;
The movable type is
A movable template having a cavity for molding a molded article;
A movable mounting plate for holding the movable mold plate;
A projecting plate that is supported so as to project toward the fixed mold side relative to the movable mounting plate, and projects a molded product in the cavity out of the cavity by a projecting operation toward the fixed mold side; Have
The fixed mold is
A fixed mounting plate having a hot runner manifold;
A guide shaft having one end fixed to the fixed mounting plate and the other end extending toward the movable mold side;
The runner lock member having one end fixed to the fixed mounting plate;
A stationary mold plate supported movably along the guide shaft and having a runner groove for forming the cold runner;
A runner holding plate interposed between the fixed mounting plate and the fixed mold plate and supported so as to be movable along the guide shaft;
The release mechanism moves the movable mold to the mold opening position with respect to the fixed mold and then fixes the runner holding plate in conjunction with an operation of projecting the protruding plate toward the fixed mold side. An injection mold for moving in a direction away from the mounting plate to release the connection between the runner connecting portion and the runner lock member. The injection mold according to claim 1,
The injection molding die, wherein the runner connecting portion and the runner lock member are connected by solidifying a molten resin around a tip portion of the runner lock member. The injection mold according to claim 2,
The runner coupling portion has a tapered portion that extends toward the fixed mold plate,
The tip of the runner lock member is an injection mold having a runner lock taper that extends toward the fixed mold plate. The injection mold according to claim 1,
The release mechanism includes a link mechanism,
The link mechanism is
A link directly or indirectly connected to the runner holding plate;
A lever shaft having one end connected to the protruding plate and the other end connected to the link;
An injection mold in which a fulcrum of the lever shaft is fixed so as not to move relative to the movable mold plate. The injection mold according to claim 1,
The release mechanism is an injection mold including a link mechanism having a power transmission part of a rack and pinion. An injection mold according to claim 1;
After the mold opening between the fixed mold plate and the movable mold plate is completed around the injection mold, and before releasing the connection between the runner connecting portion and the runner lock member, the cold An injection molding machine having runner fall prevention means for holding the runner. A step of injecting a molten material into the cavity through the hot runner manifold and the cold runner in order while the mold is closed between the fixed mold plate and the movable mold plate, and injection molding the molded product;
Thereafter, performing a mold opening between the fixed mold plate and the movable mold plate,
Thereafter, the step of projecting the molded product from the cavity by projecting in the direction of the fixed mold plate by the eject mechanism of the injection molding machine and sliding the plate;
It is arranged around the injection mold before driving the link mechanism in conjunction with the operation of pushing out the molded product to release the connection between the runner connecting portion continuous from the cold runner and the runner lock member. Holding the cold runner by means of a runner fall prevention means.

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