JP2020029062A - Resin molding die - Google Patents

Abstract

To simplify a structure by enabling application of a pushing-in force to filled resin by a pushing-in part.SOLUTION: A resin molding die (10) comprises: an ejector pin (24) for releasing a resin molding (W) molded in a cavity space (12) which is filled with molten resin (M); and a pushing-in part (25) for applying a pushing-in force to the molten resin filled in the cavity space. The molten resin is made to flow by the pushing-in force. One end of the ejector pin is provided to be protrudable from a first formation surface (18b) of the cavity space by each of ejector plates (21, 22) displaced by a rod (R) of a drive mechanism. The pushing-in part also applies the pushing-in force to the molten resin by displacing via each of the ejector plates displaced by the rod of the drive mechanism same as the above. The pushing-in part has a pair of cam surfaces (25d, 25e) which convert an action direction of the pushing-in force to a direction different from a displacement direction of each of the ejector plates.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a resin molding die capable of molding a resin molded product by solidifying a resin filled in a cavity space.

  As a resin molding die, as disclosed in Patent Document 1, there is known a mold provided with a pushing portion for flowing a molten resin in a cavity space. The pushing portion 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 pool of the pushing portion, and the resin flows in the cavity space.

JP 2014-19114 A

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

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

  The resin molding die of the present invention has a cavity forming body that forms a cavity space filled with the molten resin, a pressing portion that applies a pressing force to the molten resin filled in the cavity space, and is molded in the cavity space. An ejector pin for releasing the molded resin product, and a moving body that is displaced by a driving mechanism to drive the pushing section and the ejector pin, wherein the pushing section moves the moving body from a filling position to a pushing position. The ejector pin exerts the pushing force by being displaced, and one end of the ejector pin is provided so as to be able to protrude from the forming surface of the cavity space by displacing the moving body from the pushing position to the releasing position, and the pushing force is provided. The present invention is further characterized in that it further comprises a conversion unit for converting the action direction of the moving body into a direction different from the displacement direction of the moving body.

  According to this configuration, the molten resin can be pushed in by the pushing section by the drive mechanism that drives the ejector pin, and a mechanism only for driving the pushing section can be eliminated. Thus, the structure of the molding die and the molding device can be simplified, and the manufacturing cost of the molding die and the like can be reduced. In addition, since the pushing force by the pushing unit can be changed by the conversion unit in a direction different from the direction of displacement of the moving body, even in the case of a three-dimensionally shaped resin molded product, resin flow is generated at various positions and directions. It becomes possible to correspond to that.

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

1 is a schematic configuration diagram of a resin molding die according to an embodiment. FIG. 3 is an explanatory diagram three-dimensionally illustrating a cavity space of a resin molding die according to the embodiment. FIG. 3 is an explanatory diagram of a state in which a cavity space is filled with a molten resin in the embodiment. FIG. 4 is an explanatory diagram of a state in which a molten resin in a weld portion is caused to flow in the embodiment. It is explanatory drawing of the state which opened the mold in embodiment. FIG. 4 is an explanatory diagram of a state in which the resin molded product in the embodiment is being released.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described below, and can be implemented with appropriate modifications without departing from the scope of the invention. In the following description, “up”, “down”, “left”, and “right” are used with reference to FIG. 1 unless otherwise specified. In FIG. 2, "up", "down", "left", and "right" are indicated by arrows.

  FIG. 1 is a schematic configuration diagram of a resin molding die according to the embodiment. FIG. 2 is an explanatory view three-dimensionally showing 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 surface on which the cavity space 12 is formed 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 in the cavity space 12 from the injection molding machine through a gate 14 (see also FIG. 2).

  In the mold 10 of the present embodiment, as an example, a resin molded product having a shape formed by combining three mutually orthogonal rectangular plates is molded by the cavity space 12 shown in FIG. The resin molded product has one opening in the plane of the rectangular plate that does not communicate with the gate 14. Although the cavity space 12 is formed in a shape corresponding to the resin molded product, a part of the structure is illustrated and described in brief here, and the illustration and description of other structures are omitted.

  Returning to FIG. 1, the cavity space 12 of the present embodiment includes a first region 12a extending vertically and a second region 12b extending rightward following the lower end of the first region 12a. I have. In the second region 12b, an opening forming portion 16 (see FIG. 1) is formed to protrude at a portion corresponding to the opening of the resin molded product. Accordingly, the molten resin filled from the gate 14 hits the opening forming part 16 in the process of flowing in the cavity space 12 and is divided right and left, and then merges at a location shown by a dotted line. In other words, they merge at the middle part in the left-right direction in the region of the cavity space 12 opposite to the gate 14 of the opening forming part 16, and the merged part becomes the weld part B in the molded product.

  The resin to be filled for molding is mixed with a fibrous material in order to improve physical properties such as the strength of the molded product, and examples of the material include carbon and glass fiber. The weight average fiber length of the inclusion is preferably set to 0.1 mm or more and 15 mm or less, more preferably 1 mm or more and 5 mm or less.

  The movable mold 13 includes a mold plate portion 18 that forms the cavity space 12, a mounting plate portion 19 provided on the opposite side (right side) to the fixed mold 11 as viewed from the mold plate portion 18, and the mold plate portion 18 and the mounting plate portion. A first ejector plate (moving body) 21 and a second ejector plate (moving body) 22 disposed between the plate portions 19, and a plurality of ejector pins 24 (1 in FIG. (Only books shown). A spacer block (not shown) is provided between the mold plate portion 18 and the mounting plate portion 19, and a space S1 for each of the ejector plates 21, 22 to move left and right is secured between them.

  The template portion 18 and the fixed mold 11 have a shape that opposes in the left-right direction with the first region 12a of the cavity space 12 therebetween and opposes in the vertical direction with the second region 12b therebetween.

  The movable die 13 includes a pushing unit 25 and a drawing unit 26 one by one. In addition, a plurality of pushing parts 25 and drawing parts 26 may be provided. The pushing part 25 and the drawing part 26 are arranged so as to sandwich the formation position of the weld part B. Specifically, the lead-in portions 26 are provided on extensions extending from the respective push-in portions 25 in a direction intersecting the weld portion B. Such an extension line is not limited to a straight line and may be curved along the flow direction of the resin.

  The pushing portion 25 is provided at a position separated from the lower part of the second region 12b of the cavity space 12 by a predetermined distance and extends in the left-right direction, and a movable core 25a provided at the distal end of the movable pin 25a. 25b. The movable pin 25a is provided so as to be displaceable in the moving direction of the movable mold 13 with respect to the fixed mold 11, that is, in the horizontal direction in FIG. The movable pin 25a is inserted into movable pin holes 11a and 18a formed in the fixed die 11 and the template part 18. Each movable pin hole 11a, 18a is formed so as to communicate in the left-right direction.

  The movable core 25b is inserted into a movable core hole 11c formed in the fixed die 11. The movable core hole 11c extends upward from an intermediate portion in the left-right direction of the movable pin hole 11a and communicates with the second forming surface 11b of the cavity space 12 in the fixed mold 11. When one end surface (upper end surface) of the movable core 25b is disposed at a position (recessed) retreated from the second formation surface 11b of the cavity space 12, the one end surface thereof is recessed from the second formation surface 11b. A compression resin pool 25c serving as a space is formed.

  The front end surface (left end surface) of the movable pin 25a and the other end surface (lower end surface) of the movable core 25b are formed as a pair of cam surfaces 25d and 25e, and are provided so as to be in surface contact with each other. Each of the cam surfaces 25d and 25e is directed in a direction inclined in the upper right direction in FIG. Therefore, when the movable pin 25a is moved leftward from the state shown in FIG. 1, the respective cam surfaces 25d and 25e slide with each other. During this sliding, the cam surface 25d of the movable pin 25a pushes the cam surface 25e of the movable core 25b upward, and the movable core 25b is pushed into the cavity space 12, which is the upper side (see the white arrow in FIG. 1). . In other words, the action direction of the pushing force of the movable core 25b is changed to the upward direction with respect to the pushing force in the left direction due to the operation of the movable pin 25a. Here, a converter for converting the action direction of the pushing force in the pushing section 25 is constituted by the pair of cam surfaces 25d and 25e.

  The movable core 25b is connected to a spring (displacement means) 25f provided adjacent to the movable core 25b in the fixed die 11. The spring 25f urges the movable core 25b downward and exerts an elastic force for pressing the cam surface 25e against the cam surface 25d of the movable pin 25a. This pressing keeps the cam surfaces 25d and 25e in contact with each other.

  The pull-in portion 26 includes a pull-in resin reservoir 26a arranged at a predetermined distance from the cavity space 12, and a communication passage 26b that communicates the cavity space 12 with the pull-in resin reservoir 26a.

  An ejector hole 28 into which the ejector pin 24 is inserted is formed in the template 18. The ejector hole 28 is communicated with the first forming surface 18 b of the cavity space 12 in the template portion 18. Therefore, the tip (one end) of the ejector pin 24 can protrude from the first forming surface 18b of the cavity space 12.

  A hole 19a is formed in the mounting plate 19, and a rod R passes through the hole 19a. The rod R becomes a part of a drive mechanism (not shown) including a cylinder, a servomotor, and the like, and is capable of reciprocating in the left-right direction. Thereby, the force pushed by the drive mechanism from the rod R is applied to each of the ejector plates 21 and 22, and each of the ejector plates 21 and 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 the 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 rightward, the ejector plates 21 and 22 are displaced rightward by the force of the spring. The first ejector plate 21 may be fixed to the end of the rod R, and the ejector plates 21 and 22 pushed to the left may be displaced to the right by the driving force of the driving mechanism. In this case, the spring may be omitted.

  The mounting plate 19 is fixed to the above-described injection molding machine (not shown), and the movable mold 13 can reciprocate in a direction (left-right direction) away from and approaching 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 ejector pins 24 are slidably inserted. In addition, recesses 21b and 22b are formed in the area including the formation positions of the insertion holes 21a and 22a, respectively, on the mating surfaces of the respective ejector plates 21 and 22. A stopper 32 formed on the ejector pin 24 is accommodated in a space surrounded by the concave portions 21b and 22b. The stopper 32 has a larger diameter than the ejector pin 24 and the insertion holes 21a, 22a, and cannot be inserted into or removed from the insertion holes 21a, 22a. The lateral 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 and 22c of the recesses 21b and 22b. That is, when the stopper 32 is separated from both the bottom surfaces 21c and 22c of the concave portions 21b and 22b, even if the ejector plates 21 and 22 move left and right, the ejector pins 24 do not move left and right. Becomes

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

  When the distal end surface (left end surface) of the ejector pin 24 is located on the same plane as the first forming surface 18 b of the cavity 12 in the mold plate portion 18, the base end surface (right end surface) of the ejector pin 24 has the inner surface of the mounting plate portion 19. (Positioning portion) The length is set to a length that comes into contact with 19b. Then, in a state where the distal end surface of the ejector pin 24 is located on the same plane as the first forming surface 18b of the cavity 12, the stopper 32 is separated from the bottom surface 21c of the concave portion 21b to form the gap 33 in each of the ejector plates 21 and 22. Will be done. At this time, the distance L between the bottom surface 21c and the stopper 32 is set according to the size of the compression resin reservoir 25c in the vertical direction (displacement direction of the movable core 25b) as described later.

  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 a liquid, and water, oil, or the like is used depending on the mold 10. The coolant flows in the medium flow path, and the fixed mold 11 and the movable mold including the first formation surface 18 b of the cavity space 12 are used. 13 is temperature-controlled.

  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 diagram of a state in which the cavity space is filled with the molten resin. First, as shown in FIG. 3, the cavity space 12 is formed with the fixed mold 11 and the movable mold 13 clamped. In this state, in the space S1, while the ejector plates 21 and 22 are urged rightward by the force of a spring (not shown), the stoppers (not shown) receive the force and the ejector plates 21 and 22 are positioned. Is done. In the initial position where the ejector plates 21 and 22 are positioned as described above, the distal end surface of the movable core 25b is disposed at a position recessed from the second forming surface 11b of the cavity space 12 in the fixed mold 11, and the compression resin pool 25c is formed. Is formed.

  At this time, the ejector pin 24 is urged rightward by the force of a spring (not shown) separately from the ejector plates 21 and 22, and is pressed against the inner surface 19 b of the mounting plate 19 by the right end surface of the ejector pin 24. Are positioned in contact with each other. As a result, the distal end surface of the ejector pin 24 and the first forming surface 18b of the cavity space 12 are maintained on the same plane. In this state, the mold 10 is filled with the molten resin M by a predetermined injection pressure. The molten resin M filled in the cavity space 12 hits the opening forming part 16 and is branched, and then joins to form a weld part B. At this time, the molten resin M is also filled in the compression resin pool 25c.

  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 displacement of the ejector pin 24 is prevented because the right end face of the ejector pin 24 contacts the inner surface 19b of the mounting plate portion 19. Can be regulated. Therefore, even after filling with the molten resin M, the distal end surface of the ejector pin 24 and the first forming surface 18b of the cavity 12 are maintained on the same plane. Further, the molten resin M comes into contact with the front end surface of the movable core 25b by the injection of the molten resin M. Here, the positions of the ejector plates 21 and 22 shown in FIG. 3 are referred to as “filling positions”.

  FIG. 4 is an explanatory view of a state in which the molten resin in the weld portion has flowed. After the filling of the molten resin M and before the molten resin M solidifies, as shown in FIG. 4, the rod R of the drive mechanism (not shown) is actuated (displaced) to place each of the ejector plates 21 and 22 at the filling position. From the left to the pushing position shown in FIG. As a result of this pushing, the movable pin 25a is displaced to the left, and the cam surfaces 25d and 25e slide, whereby the movable core 25b is pressed upward and displaced. With this displacement, the movable core 25b pushes the molten resin M inside the compression resin pool 25c upward (toward the cavity space 12), and applies a pushing force to the molten resin M in the cavity space 12. At this time, the action direction of the pushing force on the molten resin M by the pushing portion 25 is changed to the upward direction with respect to the operating direction (left direction) in which the drive mechanism operates the ejector plates 21 and 22.

  When a pressing force is applied to the molten resin M, the pressure of the molten resin M rises in the cavity space 12, and the molten resin M flows into the communication passage 26b due to the increase in the pressure, and the molten resin M enters the inside of the drawing resin reservoir 26a. Be drawn in. Thereby, the molten resin M moves from right to left in FIG. 4 in the welded portion B, and one molten resin M sandwiching the welded portion B flows so as to be pressed into the other molten resin M. By this press-fitting, it is possible to break the state in which the fibrous inclusions in the molten resin M are oriented in the vertical direction in FIG. 4 at the weld portion B, thereby preventing the strength at the weld portion B and the occurrence of poor appearance. be able to.

  By the way, the stopper 32 and the bottom surface 21c are set so as not to be in contact with each other while the movable core 25b is displaced upward and pushes out the molten resin M in the compression resin pool 25c. This setting includes, in addition to the distance L (see FIG. 3) in the gap 33, the vertical width of the compression resin reservoir 25c with respect to the distance L, the inclination angles and the sizes of the cam surfaces 25d and 25e with respect to the movement amount of the movable pin 25a, and the like. This is done by adjusting. With this setting, while the movable core 25b is displaced by the drive mechanism to apply a pushing force to the molten resin M, the ejector pins 24 are not pushed by the bottom surface 21c. Here, when each of the ejector plates 21 and 22 is displaced from the filling position to the pushing position, the tip of the ejector pin 24 and the first forming surface 18b of the cavity 12 are flush with each other during pushing of the molten resin M by the pushing portion 25. The surface maintaining portion to be maintained above includes the gap 33 and the cam surfaces 25d and 25e. While the movable core 25b is displaced to apply a pushing force to the filled molten resin M, the position of the ejector pin 24 is maintained by the surface maintaining unit. In addition, at the position shown in FIG. 4, the surface maintaining unit 33 positions the distal end surface of the ejector pin 24 and the first forming surface 18 b of the cavity 12 on the same plane, and moves the distal end surface of the movable core 25 b and the cavity 12. The second formation surface 11b is located on the same plane.

  FIG. 5 is an explanatory diagram of a state where the mold is opened. After a predetermined time has passed 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. After the mold is opened, the resin molded product W is in a state of being attached to the mold plate portion 18 of the movable mold 13, and the distal end side of the movable pin 25a is out of the movable pin hole 11a and is exposed.

  FIG. 6 is an explanatory diagram of a state where the resin molded product is being released from the mold. After the mold is opened, as shown in FIG. 6, the rod R of the drive mechanism (not shown) is actuated (displaced) to push each of the ejector plates 21 and 22 further from the pushing position to the left releasing position shown in FIG. . By this pushing, first, the bottom surface 21 c of the concave portion 21 b in the first ejector plate 21 contacts the stopper 32. Further, by further operating the rod R and further pushing the ejector plates 21 and 22 leftward, the ejector pins 24 including the stopper 32 are displaced leftward with the bottom surface 21c serving as a pressing surface. Thereby, the tip of the ejector pin 24 protrudes from the first forming surface 18b of the cavity space 12 in the mold plate portion 18, and the resin molded product W is extruded from the first forming surface 18b and released. Before the mold release shown in FIG. 6, the opening forming portion 16 (see FIG. 5, not shown in FIG. 6) is buried in the mold plate portion 18, or the opening forming portion 16 is detached from the mold plate portion 18. The opening portion can be released from the mold.

  In the resin molded product W, a portion solidified in the communication passage 26b and the drawing-in resin reservoir 26a is integrated, and this portion is cut off. In the case where a part of the resin molded product W is formed of the molten resin M that has flowed into and solidified into the communication passage 26b and the drawing-in resin reservoir 26a, there is no need to perform a separating operation. In this case, the communication passage 26b and the drawing resin reservoir 26a form a part of the cavity space 12.

  As described above, according to the above-described embodiment, a single driving mechanism exerts a pushing force for pushing the molten resin M by the displacement of the movable core 25b in the pushing section 25, and a resin molded product due to the displacement of the ejector pin 24. Both W release and can be performed. This makes it possible to reduce the number of parts, simplify the structure, and reduce the manufacturing cost of the mold 10 as compared with the case where a drive mechanism is separately provided for each of them.

  Further, since the pushing surface 25 is provided with the cam surfaces 25d and 25e, the leftward moving direction of the movable pin 25a can be changed to the upward moving direction of the movable core 25b. The movable core 25b can be operated in different directions. Accordingly, even when the resin molded product W has a three-dimensional shape and the weld portion B is formed at various positions, the mold 10 that causes the resin to flow at the position and the direction corresponding to the weld portion B is formed. Design can be performed easily.

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

  The present invention is not limited to the above embodiment, and can be implemented with various modifications. In the above-described embodiment, the size, shape, orientation, and the like illustrated in the accompanying drawings are not limited thereto, and can be appropriately changed without departing from the effects of the present invention. In addition, the present invention can be appropriately modified and implemented without departing from the scope of the object of the present invention.

  The direction in which the molten resin M is pushed by the movable core 25b is not limited to the upward direction. By changing the directions of the cam surfaces 25d and 25e, the downward direction or the direction orthogonal to the paper surface of FIG. May be changed to the direction inclined with respect to the direction.

  Further, the conversion portion is constituted by the cam surfaces 25d and 25e, but various changes are possible as long as the same operation as in the above embodiment can be obtained, such as an operation direction conversion structure combining a plurality of gears. is there.

  Further, in the above embodiment, the spring 25f is adopted as the displacement means, but various configurations are adopted as long as the movable core 25b can be displaced, such as changing to a drive mechanism including an air cylinder, a linear motor, a spring, and the like.

  Although the concave portions 21b and 22b are formed on the mating surfaces of the respective ejector plates 21 and 22, one of the concave portions 21b and 22b is omitted as long as the displacement of the ejector pin 24 and the displacement can be regulated as described above. May be.

  Further, the shape of the resin molded product W does not prevent a two-dimensional shape such as a plate shape or a sheet shape, and it is sufficient that the cavity space 12 and the like are formed accordingly.

10. Molds (resin molding dies)
11 Fixed mold (cavity forming body)
12 cavity space 13 movable mold (cavity forming body)
21 First ejector plate (moving body)
22 Second ejector plate (moving body)
24 Ejector pin 25 Pushing part 25d Cam surface (converting part, surface maintaining part)
25e cam surface (conversion unit, surface maintenance unit)
33 gap (surface maintenance part)
M molten resin R rod (drive mechanism)
W resin molded product

Claims (4)

A cavity forming body forming a cavity space filled with the molten resin,
A pushing unit for applying a pushing force to the molten resin filled in the cavity space,
An ejector pin for releasing the resin molded product molded in the cavity space,
A moving body that is displaced by a drive mechanism and displaces the pushing section and the ejector pin,
The pushing portion exerts the pushing force by the moving body being displaced from the filling position to the pushing position,
One end of the ejector pin is provided so as to be able to protrude from the first forming surface of the cavity space when the moving body is displaced from the pushing position to the release position,
A resin molding die, further comprising a conversion part for converting the direction of action of the pushing force into a direction different from the direction of displacement of the moving body.   The said conversion part is provided with a pair of cam surface, and this pair of cam surfaces slides mutually by the displacement of the said moving body, and changes the action direction of the said pushing force, The Claim 1 characterized by the above-mentioned. Resin molding die.   While the moving body is displaced from the filling position to the pushing position, a surface maintaining portion for maintaining the tip surface of the ejector pin and the first forming surface of the cavity space on the same plane is provided. The resin molding die according to claim 1 or 2, wherein:   4. The method according to claim 3, wherein, when the moving body is located at the pushing position, a tip end surface of the pushing portion that contacts the molten resin and a second forming surface of the cavity space are located on the same plane. 5. The resin molding die described.

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