JP2018192731A - Resin molding mold - Google Patents

Abstract

To enable a pushing force to be applied to resin filled by a pushing part to enable simplification of a structure.SOLUTION: A resin molding mold (10) includes: an ejector pin (24) for demolding a resin molded product (W) molded in a cavity space (12) where a molten resin (M) is filled; and a pushing part (25) for applying a pushing force to the molten resin filled into the cavity space, and allows the molten resin to flow by the pushing force. An end of the ejector pin is provided so as to be enabled to protrude from a surface (18a) forming the cavity space by being displaced by receiving a force from a rod (R) of a driving mechanism. The pushing part applies the pushing force to the molten resin by being displaced by receiving a force from the rod of the same driving mechanism as that described above.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a resin molding die that can solidify a resin filled in a cavity space to mold a resin molded product.

  As a resin mold, as disclosed in Patent Document 1, a mold having a pressing portion for flowing a molten resin in a cavity space is known. The pushing part has a resin reservoir communicating with the cavity space and a movable core that changes the volume of the resin reservoir. In Patent Literature 1, the movable core of the pushing portion is moved to compress the volume of the resin reservoir in the pushing portion, thereby causing resin flow in the cavity space.

JP 2014-19114 A

  In Patent Document 1, a compression mechanism is provided to move the movable core so that the resin filled in the cavity space flows. In such a compression mechanism, in order to move the movable core by the mold clamping mechanism, in addition to the hydraulic cylinder, a spacer and various parts for connecting them are required. These driving mechanisms are not only large-scale but also installed only for moving the movable core that causes resin flow. Therefore, there is a problem that the number of parts of the mold and molding apparatus increases and the structure is complicated, resulting in an increase in manufacturing cost.

  The present invention has been made in view of such points, and an object of the present invention is to provide a resin molding die that can apply a pressing force to the resin filled by the pressing portion and can simplify the structure. To do.

  The resin molding die of the present invention includes a cavity forming body that forms a cavity space filled with molten resin, an ejector pin for releasing a resin molded product molded in the cavity space, and the cavity space is filled. A resin molding die for causing the molten resin to flow by the pushing force, wherein one end of the ejector pin protrudes from the formation surface of the cavity space by a driving mechanism. The pushing portion is provided so as to exhibit the pushing force by being displaced by the drive mechanism.

  According to this configuration, the molten resin can be pushed in by the pushing portion by the drive mechanism that drives the ejector pin, and a mechanism only for driving the pushing portion can be eliminated. As a result, the structure of the molding die and the molding apparatus can be simplified, and as a result, the manufacturing cost of the molding die and the like can be reduced.

  According to the present invention, a pressing force can be applied to the resin filled by the pressing portion, and the structure of the molding die or the like can be simplified.

It is a schematic block diagram of the resin mold which concerns on 1st Embodiment. It is a plane sectional view of the cavity space of the resin mold in a 1st embodiment. It is explanatory drawing of the state which filled the cavity space in 1st Embodiment with molten resin. It is explanatory drawing of the state which made the molten resin of the weld part flow in 1st Embodiment. It is explanatory drawing of the state which the mold opened in 1st Embodiment. It is explanatory drawing of the state which made the resin molded product in 1st Embodiment into mold release. It is a schematic block diagram of the resin molding die concerning 2nd Embodiment. It is explanatory drawing of the state which filled the cavity space in 2nd Embodiment with molten resin. It is explanatory drawing of the state which made the molten resin of the weld part flow in 2nd Embodiment. It is explanatory drawing of the state which the mold opened in 2nd Embodiment. It is explanatory drawing of the state which made the resin molded product in 2nd Embodiment into mold release. It is a schematic block diagram of the resin molding die which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited to the following embodiment, It can deform | transform suitably and implement in the range which does not change the summary. In the following description, “upper”, “lower”, “left”, and “right” are used with reference to FIG. 1 unless otherwise specified.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of a resin molding die according to the first embodiment. FIG. 2 is a plan sectional view of the cavity space of the resin molding die. As shown in FIG. 1, a resin molding die (hereinafter simply referred to as “die”) 10 includes a fixed die 11 and a movable die 13 that forms a cavity space 12 between the fixed die 11. ing. Therefore, a cavity forming body is constituted by the fixed mold 11 and the movable mold 13, and a forming surface of the cavity space 12 is formed by their relative surfaces. The fixed mold 11 and the movable mold 13 are mounted on an injection molding machine (not shown), and a thermoplastic molten resin is filled into the cavity space 12 from the injection molding machine through a gate 14 (see FIG. 2).

  In the mold 10 of the present embodiment, a molded product having one opening is formed, and an opening forming portion 16 is formed to protrude in a portion corresponding to the opening in the cavity space 12. Therefore, the molten resin filled from the gate 14 hits the opening forming portion 16 in the process of flowing through the cavity space 12 and is divided vertically (left and right in FIG. 2), and then merged at a position indicated by a dotted line. More specifically, in the cavity space 12, a region on the opposite side of the opening forming portion 16 from the gate 14 joins at the middle portion in the left-right direction in FIG. 2, and this joined portion becomes a weld portion B in the molded product.

  In order to improve physical properties such as strength of the molded product, the resin to be filled for molding is blended with fibrous inclusions, and examples of the inclusions include carbon and glass fibers. The weight average fiber length of the inclusions is preferably set to 0.1 mm to 15 mm, more preferably 1 mm to 5 mm.

  In addition, the shape of the resin molded product molded in the cavity space 12 is a two-dimensional shape such as a plate shape or a sheet shape, or a three-dimensional shape in which unevenness is formed at various positions. be able to. In the present embodiment, as an example, a part of the cavity space 12 for molding a plate-shaped resin molded product having one opening in the surface and the peripheral structure thereof will be simply illustrated and described. The illustration and description of the other components are omitted.

  The movable mold 13 includes a mold plate portion 18 that forms the cavity space 12, a mounting plate portion 19 that is provided on the opposite side (right side) of the fixed mold 11 when viewed from the mold plate portion 18, and the mold plate portion 18 and the mounting plate 13. A first ejector plate (support body) 21 and a second ejector plate (support body) 22 disposed between the plate portions 19 and a plurality of ejector pins 24 supported by the ejector plates 21 and 22 are provided. . A spacer block (not shown) is provided between the mold plate portion 18 and the mounting plate portion 19, and a space S1 for moving the ejector plates 21 and 22 to the left and right is secured between them.

  Further, the movable mold 13 includes one pusher 25 and one retractor 26. In addition, you may provide multiple pushing parts 25 and drawing-in parts 26, respectively. The pushing portion 25 and the drawing portion 26 are arranged to face each other with the formation position of the weld portion B interposed therebetween. Specifically, the lead-in portions 26 are provided on extension lines extending from the respective push-in portions 25 in a direction perpendicular to the weld portion B (see FIG. 2).

  The pushing portion 25 includes a movable core 25 a having a column shape such as a cylinder or a prism inserted through the template portion 18. The movable core 25a is provided so as to be displaceable in the direction of moving back and forth in the cavity space 12, that is, in the horizontal direction in FIG. When the distal end surface of the movable core 25a is disposed at a position that is recessed (depressed) from the formation surface 18a of the cavity space 12 in the template portion 18, the distal end side becomes a space recessed from the formation surface 18a. A compression resin reservoir 25b is formed.

  The drawing-in portion 26 includes a drawing resin reservoir 26a disposed at a predetermined interval from the cavity space 12, a communication passage 26b communicating the cavity space 12 and the drawing resin reservoir 26a, and an opening / closing member that opens and closes the communication passage 26b. 26c. The opening / closing member 26c is displaced in the left-right direction, and the opening and closing of the communication passage 26b can be switched by this displacement. On the front end surface (left end surface) of the opening / closing member 26c, an inclined surface that gradually decreases toward the cavity space 12 side is formed. The retracting portion 26 further includes a spring 26d (displacement means) provided on the right portion of the opening / closing member 26c, and the spring 26d urges the opening / closing member 26c to the left to form the left side of the communication passage 26b. An elastic force is exerted to press the opening / closing member 26c. When the opening / closing member 26c comes into contact with the communication path 26b by this pressing, the communication path 26b is closed.

  In the template 18, an ejector hole 28 into which the ejector pin 24 is inserted and a movable core hole 29 into which the movable core 25 a is inserted are formed. The ejector hole 28 and the movable core hole 29 communicate with the formation surface 18 a of the cavity space 12 in the template 18. Therefore, each end (one end) of the ejector pin 24 and the movable core 25 a can protrude from the formation surface 18 a of the cavity space 12.

  A hole 19a is formed in the mounting plate portion 19, and the rod R passes through the hole 19a. The rod R becomes a part of a drive mechanism (not shown) including a cylinder, a servo motor, and the like, and can reciprocate in the left-right direction. Thereby, the force pushed from the rod R by the drive mechanism is applied to each ejector plate 21, 22, and each ejector plate 21, 22 can be displaced to the left. On the other hand, each of the ejector plates 21 and 22 receives a force returning to the right side by an elastic force of a spring (not shown) provided between the template 18 and the second ejector plate 22. Accordingly, when the rod R is displaced to the left, the ejector plates 21 and 22 are displaced to the left under the force of the spring. The first ejector plate 21 may be fixed to the tip of the rod R, and the ejector plates 21 and 22 pushed into the right side may be displaced to the left side by the driving force of the driving mechanism. In this case, the spring can be omitted.

  The mounting plate portion 19 is fixed to the above-described injection molding machine (not shown), and can be reciprocated in the direction (left-right direction) in which the movable mold 13 moves away from and approaches the fixed mold 11 by driving the injection molding machine. Become. Thereby, the resin molded product W (see FIG. 5) molded inside the cavity space 12 can be taken out of the mold 10.

  The first ejector plate 21 and the second ejector plate 22 are formed with insertion holes 21a and 22a into which the ejector pins 24 are slidably inserted. And it is an area | region including the formation position of the insertion holes 21a and 22a, Comprising: The recessed parts 21b and 22b are formed in the mating surface of each ejector plate 21 and 22, respectively. A stopper 32 formed on the ejector pin 24 is accommodated in the space surrounded by the recesses 21b and 22b. The stopper 32 is formed larger in diameter than the ejector pin 24 and the insertion holes 21a and 22a, and cannot be inserted into and removed from the insertion holes 21a and 22a. The left-right width of the stopper 32 (the width in the extending direction of the ejector pin 24) is set shorter than the distance between the bottom surfaces 21c, 22c of the recesses 21b, 22b. That is, when the stopper 32 is separated from both the bottom surfaces 21c and 22c of the recesses 21b and 22b, even if the ejector plates 21 and 22 move to the left and right, the ejector pins 24 do not move to the left and right. It becomes.

  The second ejector plate 22 has a stepped hole 22d into which the movable core 25a is inserted. Moreover, the right end (other end) side of the movable core 25a is formed in a stepped shape that fits into the stepped hole 22d. When the ejector plates 21 and 22 are stacked with the movable core 25a fitted in the stepped hole 22d, the first ejector plate 21 contacts the right end of the movable core 25a. Thereby, the movable core 25a is supported in a state where movement in the axial direction (left-right direction) is restricted with respect to the ejector plates 21 and 22.

  When the front end surface (left end surface) of the ejector pin 24 is positioned on the same plane as the formation surface 18 a of the cavity 12 in the template plate portion 18, the base end surface (right end surface) is the inner surface (positioning) of the mounting plate portion 19. Part) 19b is set to a length in contact with 19b. And in the state which the front end surface of the ejector pin 24 is located in the same surface as the formation surface 18a of the cavity 12, in each ejector plate 21,22, the stopper 32 leaves | separates from the bottom face 21c of the recessed part 21b, and the clearance gap 33 is formed. It will be. At this time, the distance L between the bottom surface 21c and the stopper 32 is set to be the same as the width H in the left-right direction of the compression resin reservoir 25b (the displacement direction of the movable core 25a).

  A cooling medium flow path (not shown) is formed in the fixed mold 11 and the movable mold 13, and a circuit for passing a refrigerant is connected to the medium flow path. The coolant may be liquid as long as water, oil, or the like is used in accordance with the mold 10, and the coolant flows into the medium flow path, so that the entire fixed mold 11 and the movable mold 13 including the formation surface 18 a of the cavity space 12. The temperature is adjusted.

  Next, a method for molding a resin molded product using the mold 10 according to the present embodiment will be described.

  FIG. 3 is an explanatory view of a state in which the cavity space is filled with molten resin. First, as shown in FIG. 3, the cavity space 12 is formed with the fixed mold 11 and the movable mold 13 being clamped. In this state, the ejector plates 21 and 22 are biased downward by the force of the spring (not shown) in the space S1, and the stopper (not shown) receives the force and the ejector plates 21 and 22 are positioned. Is done. Thus, at the initial position where the ejector plates 21 and 22 are positioned, the distal end surface of the movable core 25a is arranged at a position recessed from the formation surface 18a of the cavity space 12 in the mold plate portion 18, and the compression resin reservoir 25b is formed. It is formed.

  At this time, the ejector pin 24 is urged downward by the force of a spring (not shown) separately from the ejector plates 21 and 22, and the right end surface of the ejector pin 24 is applied to the inner surface 19 b of the mounting plate portion 19. Are positioned in contact. Thereby, the front end surface of the ejector pin 24 and the formation surface 18a of the cavity space 12 are maintained on the same surface. In this state, the mold 10 is filled with the molten resin M with a predetermined injection pressure. The molten resin M filled in the cavity space 12 collides with the opening forming portion 16 and then joins to form a weld portion B. At this time, the molten resin M is also filled in the compression resin reservoir 25b.

  Thus, even if the molten resin M is injected into the cavity 12 and the pressure due to the injection is applied to the ejector pin 24, the right end surface of the ejector pin 24 comes into contact with the inner surface 19b of the mounting plate portion 19, so that the displacement of the ejector pin 24 is reduced. Can be regulated. Therefore, even after the molten resin M is filled, the tip end surface of the ejector pin 24 and the forming surface 18a of the cavity 12 are maintained on the same plane.

  FIG. 4 is an explanatory diagram of a state in which the molten resin in the weld portion is flowed. After the molten resin M is filled and before the molten resin M is solidified, the ejector plates 21 and 22 are pushed to the left by operating the rod R of the drive mechanism (not shown) as shown in FIG. By this pushing, the movable core 25a is displaced to the left, and due to such displacement, the movable core 25a pushes the molten resin M inside the compression resin reservoir 25b to the cavity space 12 side, and into the molten resin M in the cavity space 12 Apply indentation force.

  When a pressing force is applied to the molten resin M, the pressure of the molten resin M is increased in the cavity space 12, and the pressure is applied to the inclined surface at the left end of the opening / closing member 26c due to the pressure increase, thereby moving the opening / closing member 26c to the right. Works. Here, the elastic force of the spring 26d that biases the opening / closing member 26c restricts the displacement of the opening / closing member 26c by the injection pressure of the molten resin M into the cavity space 12, and the molten resin M is displaced by the displacement of the movable core 25a. It is set to allow the displacement of the opening / closing member 26c to the right due to the pressure increase. Accordingly, the opening / closing member 26c moves to the right in response to the pressing of the movable core 25a, the molten resin M flows into the communication path 26b, and the molten resin M is drawn into the drawing-in resin reservoir 26a.

  Thereby, in the weld part B of the molten resin M, a movement from the lower side to the upper side in FIG. 4 occurs, and one molten resin M sandwiching the weld part B flows so as to press fit into the other molten resin M. This press-fitting can break the state in which the fibrous inclusions in the molten resin M are oriented in the left-right direction in FIG. 4 at the weld portion B, thereby preventing the strength reduction at the weld portion B and the appearance failure. be able to.

  By the way, since the distance L in the gap 33 and the horizontal width H of the compression resin reservoir 25b are the same (see FIG. 3), the movable core 25a is displaced to the left, and the molten resin M in the compression resin reservoir 25b is removed. During the extrusion, the stopper 32 and the bottom surface 21c can be brought into non-contact. In other words, since the gap 33 is provided as described above, the ejector pin 24 is not pushed in by the bottom surface 21c while the movable core 25a is displaced by the drive mechanism and the pushing force is applied to the molten resin M. Here, a surface maintaining portion that maintains the tip of the ejector pin 24 and the forming surface 18 a of the cavity 12 on the same surface during the pressing of the molten resin M by the pressing portion 25 includes the gap 33. Accordingly, the position of the ejector pin 24 is maintained by the surface maintaining portion while the movable core 25a is displaced so as to apply a pressing force to the filled molten resin M.

  FIG. 5 is an explanatory diagram of a state where the mold is opened. After the predetermined time has elapsed and the molten resin M filled in the mold 10 has solidified, the movable mold 13 is driven away from the fixed mold 11 to open the mold, as shown in FIG. Thereby, the resin molded product W molded in the cavity space 12 is exposed. Further, after the mold opening, the resin molded product W is attached to the mold plate portion 18 of the movable mold 13.

  FIG. 6 is an explanatory diagram of a state in which the resin molded product is being released. After opening the mold, as shown in FIG. 6, the rod R of the drive mechanism (not shown) is operated to push the ejector plates 21 and 22 further leftward. By this pushing, first, the bottom surface 21 c of the recess 21 b in the first ejector plate 21 comes into contact with the stopper 32. Further, by operating the rod R and pushing the ejector plates 21 and 22 further leftward, the bottom surface 21c becomes a pressing surface and the ejector pin 24 including the stopper 32 is displaced leftward. As a result, the tip of the ejector pin 24 protrudes from the formation surface 18a of the cavity space 12 in the mold plate 18, and the resin molded product W is pushed out of the formation surface 18a and released.

  At this time, due to the leftward displacement of each ejector plate 21, 22, the movable core 25 a supported by the ejector plates 21, 22 is also displaced upward, and the front end side protrudes from the formation surface 18 a of the cavity space 12. Also by this protrusion, a force in the direction of releasing the resin molded product W can be applied. That is, the movable core 25a can function in the same manner as the ejector pin 24.

  In the resin molded product W, the solidified portion in the communication passage 26b and the drawing-in resin reservoir 26a is integrated, so that this portion is cut off. In addition, when forming a part of the resin molded product W with the molten resin M that has flowed into the communication passage 26b and the drawing resin reservoir 26a and solidified, the separation work is not necessary. In this case, the communication path 26 b and the drawing-in resin reservoir 26 a form a part of the cavity space 12.

  As described above, according to the above-described embodiment, a resin-molded product that exhibits the pushing force of pushing the molten resin M by the displacement of the movable core 25a in the pushing portion 25 and the displacement of the ejector pin 24 by a single drive mechanism. Both W and mold release can be performed. Thereby, compared with the case where a drive mechanism is provided separately for them, the number of parts can be reduced and the structure can be simplified, and the manufacturing cost of the mold 10 can be reduced.

  Further, since a gap 33 having a distance L is formed between the bottom surface 21c and the stopper 32, the ejector plates 21 and 22 can be displaced to displace the movable core 25a before the resin M is solidified. The ejector pin 24 can be kept positioned without being displaced. Thereby, before the molding is completed, the tip surface of the ejector pin 24 does not protrude from the formation surface 18a of the cavity 12, and it is possible to prevent unintended irregularities from being formed on the resin molded product W.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the following description, the same reference numerals may be used for the same or equivalent components as in the second embodiment, and the description may be omitted or simplified.

  FIG. 7 is a schematic configuration diagram of a resin mold according to the second embodiment. As shown in FIG. 7, in the mold 10 according to the second embodiment, a first movable core plate (support) 41 and a second movable core plate are provided between the mounting plate portion 19 and the first ejector plate 21. (Support) 42 is provided. A spacer block (not shown) is provided between the first ejector plate 21 and the second movable core plate 42, and a space S2 for moving the movable core plates 41, 42 to the left and right is secured between them. Is done. The width in the left-right direction of the space S2 is set to be the same as the width H in the left-right direction of the compression resin reservoir 25b.

  The second movable core plate 42 has a stepped hole 42a into which the movable core 25a is inserted. When the movable core plates 41 and 42 are overlapped in a state where the stepped shape at the right end of the movable core 25a is fitted in the stepped hole 42a, the first movable core plate 41 contacts the right end of the movable core 25a. Thereby, the movable core 25a is supported in a state where movement in the axial direction (left-right direction) is restricted with respect to the respective movable core plates 41 and 42.

  In the second embodiment, the second ejector plate 22 has a stepped hole 22e into which the ejector pin 24 is inserted. Further, the right end (other end) side of the ejector pin 24 is formed in a stepped shape that fits into the stepped hole 22e. When the ejector plates 21 and 22 are overlapped with the ejector pins 24 fitted in the stepped holes 22e, the first ejector plate 21 comes into contact with the right end of the ejector pins 24. Thereby, the ejector pin 24 is supported in a state where movement in the axial direction (left-right direction) is restricted with respect to the ejector plates 21 and 22. The ejector plates 21 and 22 are formed with holes 21f and 22f into which the movable core 25a is slidably inserted.

  Next, a molding method using the mold 10 according to the second embodiment will be described with reference to FIGS. FIG. 8 is an explanatory diagram of a state in which the cavity space is filled with a molten resin in the second embodiment. FIG. 9 is an explanatory diagram of a state in which the molten resin in the weld portion is flowed in the second embodiment. FIG. 10 is an explanatory diagram of a mold opened state according to the second embodiment. FIG. 11 is an explanatory diagram of a state in which the resin molded product in the second embodiment is being released.

  As shown in FIG. 8, a compression resin reservoir 25b is formed on the distal end side of the movable core 25a in a state where the ejector plates 21 and 22 and the movable core plates 41 and 42 are positioned by clamping. Further, the tip end surface of the ejector pin 24 and the formation surface 18a of the cavity space 12 are maintained on the same plane. In this state, the molten resin M is filled into the cavity space 12 with a predetermined injection pressure. At this time, the molten resin M is also filled in the compression resin reservoir 25b.

  After the molten resin M is filled and before the molten resin M is solidified, the movable core plates 41 and 42 are pushed leftward by operating the rod R of the drive mechanism (not shown) as shown in FIG. . Due to the leftward displacement of the movable core 25 a due to this pushing, the molten resin M inside the compression resin reservoir 25 b is pushed out to the cavity space 12 side, and a pushing force is applied to the molten resin M in the cavity space 12. When this pushing force is applied, the opening / closing member 26c moves to the right side due to an increase in pressure of the molten resin M, the molten resin M flows into the communication path 26b, and the molten resin M is drawn into the drawing resin reservoir 26a.

  Since the left-right width H of the compression resin reservoir 25b and the left-right width of the space S2 are the same, the first ejector plate is moved while the movable core 25a is displaced leftward to push out the molten resin M in the compression resin reservoir 25b. 21 and the second movable core plate 42 are not in contact with each other. In other words, since the space S2 is provided, the ejector pin 24 is not pushed in while the movable core 25a is displaced by the drive mechanism and the pushing force is applied to the molten resin M. Here, a surface maintaining portion that maintains the tip of the ejector pin 24 and the formation surface 18a of the cavity 12 on the same surface during the pressing of the molten resin M by the pressing portion 25 includes the space S2.

  After the filled molten resin M is solidified, the movable mold 13 is driven in a direction away from the fixed mold 11 to open the mold, as shown in FIG. Thereby, the resin molded product W molded in the cavity space 12 is exposed. In this state, as shown in FIG. 11, the rod R of the drive mechanism (not shown) is operated to push the movable core plates 41 and 42 further leftward. By this pushing, first, the left surface of the second movable core plate 42 contacts the lower surface of the first ejector plate 21. Further, by operating the rod R and pushing the movable core plates 41 and 42 further leftward, the ejector plates 21 and 22 are displaced leftward via the movable core plates 41 and 42, The ejector pin 24 supported on the left side is also displaced leftward. As a result, the tip of the ejector pin 24 protrudes from the formation surface 18a of the cavity space 12 in the mold plate 18, and the resin molded product W is pushed out of the formation surface 18a and released.

  At this time, due to the leftward displacement of each of the movable core plates 41, 42, the movable core 25 a supported by the movable core plates 41, 42 is also displaced leftward, and the tip side protrudes from the formation surface 18 a of the cavity space 12. Also by this protrusion, a force in the direction of releasing is applied to the resin molded product W, and the movable core 25a can function similarly to the ejector pin 24.

  According to the second embodiment as described above, the ejector pin 24 does not have to have a shape in which the intermediate portion in the extending direction has a large diameter like the stopper 32 (see FIG. 1) in the first embodiment. . Moreover, formation of the recessed part 21b of the 1st ejector plate 21 in 1st Embodiment can be abbreviate | omitted. In this way, the configuration can be simplified, the parts can be easily manufactured, and the time can be shortened. Thus, the manufacturing cost can be reduced. In contrast to each embodiment, the first embodiment is advantageous in that the movable core plates 41 and 42 of the second embodiment can be omitted, and the width of the mold 10 as a whole can be made compact. It becomes.

  In addition, in the metal mold | die 10, as shown in FIG. 12, you may add the structure which adjusts the temperature of the molten resin M around the movable core 25a. FIG. 12 is a schematic configuration diagram of a resin mold according to a modification. In the mold 10 of FIG. 12, a coil heater (core temperature adjusting portion) 51 formed in a sleeve shape is provided in the movable core hole 29, and the movable core 25 a is inserted into the coil heater 51. In other words, the coil heater 51 is provided in the vicinity of the outer periphery of the movable core 25a, and can heat the resin inside and around the compression resin reservoir 25b. The heating described here indicates that the heated portion is set to a temperature higher than the surrounding resin temperature, and also includes heat retention for reducing the temperature decrease rate of the resin. Further, the coil heater 51 is formed over a predetermined depth from the formation surface 18a of the cavity space 12, and is preferably provided over a range longer than the maximum stroke length of the movable core 25a.

  In the mold 10 of FIG. 12, the movable core 25a has a hollow structure, and a sheath heater (core temperature adjusting unit) 52 is provided therein. The sheath heater 52 heats the movable core 25a and heats the resin inside and around the compression resin reservoir 25b by this heating. The sheath heater 52 is preferably provided so as to be able to heat a range extending from the vicinity of the distal end of the movable core 25a toward the base side and being longer than the maximum stroke length of the movable core 25a.

  The fixed mold 11 and the movable mold 13 are provided with a sheath heater (merging region temperature adjusting unit) 53. The sheath heater 53 is arranged in the vicinity of the formation surface 18a of the cavity space 12 and straddling the weld portion B, which is a region where the molten resin M merges. The sheath heater 53 is formed in a meandering shape or a state bent in a spiral shape, and heats a resin in a predetermined region with the weld B as a center.

  In each of the above embodiments, the spring 26d is used as the displacing means. However, various configurations may be adopted as long as the opening / closing member 26c can be displaced, such as changing to a driving mechanism including an air cylinder, a linear motor, a spring, or the like. .

  In addition, although the recesses 21b and 22b are formed in the respective mating surfaces of the ejector plates 21 and 22, either one of the recesses 21b and 22b is omitted as long as the ejector pin 24 can be displaced and regulated as described above. May be.

  Further, the distance L between the bottom surface 21c forming the gap 33 and the stopper 32 may be smaller than the left-right width H of the compression resin reservoir 25b. However, in this case, the portion that has flowed into and solidified into the compression resin reservoir 25b is integrated, so this portion is cut off or a part of the resin molded product W is formed.

  Moreover, although each embodiment of the present invention has been described, as another embodiment of the present invention, the above embodiments may be combined in whole or in part.

  The embodiments of the present invention are not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea of the present invention. Furthermore, if the technical idea of the present invention can be realized in another way by technological advancement or another derived technique, the method may be used. Accordingly, the claims cover all embodiments that can be included within the scope of the technical idea of the present invention.

10 Mold (resin molding mold)
12 Cavity space 18a Forming surface 19b Inner surface (positioning part)
21 First ejector plate (support)
21c Bottom (pressing surface)
22 Second ejector plate (support)
24 Ejector pin 25 Push-in part 26 Pull-in part 33 Clearance (surface maintaining part)
41 First movable core plate (support)
42 Second movable core plate (support)
M Molten resin R Rod (drive mechanism)
S2 space (surface maintenance part)
W resin molded product

Claims (8)

A cavity forming body that forms a cavity space filled with a molten resin;
An ejector pin for releasing a resin molded product molded in the cavity space;
A pressing part that applies a pressing force to the molten resin filled in the cavity space, and a resin molding die that causes the molten resin to flow by the pressing force,
One end of the ejector pin is provided so as to protrude from the formation surface of the cavity space by a drive mechanism,
The said pressing part exhibits the said pressing force by displacing with the said drive mechanism, The resin molding die characterized by the above-mentioned.   2. The resin molding die according to claim 1, wherein the cavity forming body has a shape in which molten resin filled in the cavity space merges in at least one place.   3. The apparatus according to claim 1, further comprising a drawing portion that draws in the molten resin that is filled in response to the pushing of the pushing portion, and causing the molten resin to flow from the pushing portion toward the drawing portion. Resin molding mold.   4. A surface maintaining portion for maintaining the tip of the ejector pin and the surface on which the cavity space is formed on the same surface while displacing the push-in portion. 2. A resin molding die according to item 1. A support body that supports the ejector pin and the pushing portion, and that is displaced by the force applied by the drive mechanism,
The resin molding die according to claim 4, wherein the surface maintaining unit maintains the position of the ejector pin while displacing the push-in unit via the support. When releasing the resin molded product, provided with a pressing surface that is formed on the support and pushes the ejector pin,
The said surface maintenance part is equipped with the clearance gap formed between the said pressing surface and the said ejector pin, while displacing the said pushing part and applying the said pushing force, The Claim 4 or Claim characterized by the above-mentioned. 5. A resin molding die according to 5.   7. The positioning device according to claim 1, further comprising: a positioning unit that positions the ejector pin by contacting a part of the ejector pin when the cavity space is filled with resin. 8. The resin mold as described in 2. The resin according to any one of claims 1 to 7, wherein the pushing portion applies a force in the mold release direction to the resin molded product when the resin molded product is released. Molding mold.

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