WO2020174615A1 - Undercut processing mechanism, molding die, and molded article - Google Patents

Undercut processing mechanism, molding die, and molded article Download PDF

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Publication number
WO2020174615A1
WO2020174615A1 PCT/JP2019/007593 JP2019007593W WO2020174615A1 WO 2020174615 A1 WO2020174615 A1 WO 2020174615A1 JP 2019007593 W JP2019007593 W JP 2019007593W WO 2020174615 A1 WO2020174615 A1 WO 2020174615A1
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WO
WIPO (PCT)
Prior art keywords
piece
sliding piece
holding piece
processing mechanism
holder
Prior art date
Application number
PCT/JP2019/007593
Other languages
French (fr)
Japanese (ja)
Inventor
正典 反本
Original Assignee
株式会社テクノクラーツ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社テクノクラーツ filed Critical 株式会社テクノクラーツ
Priority to PCT/JP2019/007593 priority Critical patent/WO2020174615A1/en
Priority to JP2021501460A priority patent/JP7128558B2/en
Publication of WO2020174615A1 publication Critical patent/WO2020174615A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles

Definitions

  • the present invention relates to an undercut processing mechanism, a molding die and a molded product that are used by being attached to a molding die for molding a molded product having an undercut portion.
  • ejection In a molding die for molding a molded article having an undercut portion, if the molded article cannot be removed from the molding die by a single-step ejection operation due to the shape of the molded article including the undercut portion, ejection A two-stage ejecting mechanism that performs the process in two stages is used.
  • a molding die including an undercut processing mechanism and a two-step protruding mechanism as shown in Patent Document 1 is used for molding such a molded product.
  • the two-stage ejection mechanism has a larger number of parts and a more complicated structure than the one-stage ejection mechanism, and the molding die is inevitably large.
  • An object of the present invention is to provide a compact undercut processing mechanism, a molding die, and a molded product that can be easily die-cut even if the molded product has a portion that protrudes in the direction of removing the undercut portion. Is to provide.
  • the present invention relates to an undercut processing mechanism for forming a molded product having an undercut portion, which is used by being attached to a fixed mold or a movable mold of a molding die including an ejector mechanism for ejecting the molded product, And a sliding piece that moves forward and backward in association with a holding piece, and is fixed to the fixed die or the movable die or is integrally provided on the fixed die or the movable die.
  • a holder provided with a guide means for guiding the sliding piece so as to be separated from the undercut portion, a holding piece guided by the holder and moving forward and backward in association with the ejector mechanism, and a sliding movement of the holding piece and the sliding piece.
  • a connecting mechanism that freely connects, and the connecting means includes a releasing mechanism that releases the connection between the holding piece and the sliding piece when the sliding piece moves to a specified position. This is an undercut processing mechanism.
  • the holding piece has a protrusion that extends in a direction intersecting the advancing/retreating direction at the tip of the main body, and a claw that can be locked, and a part of the protrusion is a portion of the main body.
  • a projecting portion projecting from a side surface, a dovetail groove into which the claw is slidably fitted is provided between the main body of the holding piece and the convex strip, and the sliding piece has the claw and the claw Is open, and the protruding portion of the convex strip is movable above the pawl and immovable below the pawl, and the connecting means includes the convex strip, the dovetail groove, and the pawl. It is characterized by being configured.
  • the undercut processing mechanism of the present invention is characterized by further comprising one or more position/orientation holding means for holding the position and orientation of the sliding piece that has been disconnected from the holding piece.
  • the position/orientation holding means includes two abutting surfaces provided on the sliding piece, and the first abutting surface is a side surface that abuts an inner wall of a side surface of the holder.
  • the second contact surface is a surface parallel to the inner wall, and the second contact surface is a surface parallel to the main body side surface that contacts the main body side surface of the holding piece, and the first contact surface contacts the side surface inner wall of the holder.
  • the second contact surface contacts the side surface of the main body of the holding piece to hold the position and posture of the sliding piece.
  • the position/orientation holding means is provided in at least one of the sliding piece, the holder, and the holding piece, and the sliding piece that is disconnected from the holding piece is It is characterized in that it is a locking means for removably locking the holder, the holding piece, or the holder and the holding piece.
  • the locking means is a ball plunger, a leaf spring, or an elastic body having a convex portion that is detachably fitted into the concave portion.
  • the undercut processing mechanism of the present invention is characterized by further including a posture holding means for holding the posture of the holding piece with respect to the holder.
  • the posture maintaining means includes a ridge and a groove into which the ridge is slidably fitted, and the ridge and the groove are respectively formed on the inner wall surface of the holder and the holding piece.
  • the undercut processing mechanism of the present invention is characterized in that at least the holding piece and the sliding piece are incorporated into the holder to form a unit.
  • the undercut processing mechanism of the present invention of the corners of the upper surface and the side surface of the main body of the holding piece, at least the corner facing the sliding piece whose connection with the holding piece is released, and the main body of the sliding piece.
  • the corners of the bottom surface and the side surfaces of the above at least the corners facing the holding piece that has been disconnected from the sliding piece are chamfered so as to prevent them from biting each other.
  • the present invention is a movable type or a fixed type including one or more of the undercut processing mechanism.
  • the present invention is also a molding die including at least one undercut processing mechanism.
  • the present invention is a molded product molded by the undercut processing mechanism, the movable mold or the fixed mold, or the molding die, and has a portion protruding toward the tip in the direction of pulling out the undercut portion. It is a molded product.
  • a compact undercut processing mechanism, a molding die, and a molded product that can be easily stamped even if the molded product has a portion that protrudes in the direction of pulling out the undercut portion Can be provided.
  • FIG. 3 is an external view of the holder 20, the holding piece 30, and the sliding piece 50 of the molding die 1 according to the first embodiment of the present invention. It is a figure which shows the state which hold
  • FIG. 6 is a cross-sectional view of the molding die 1 of the first embodiment of the present invention during the ejection operation of the molded product P.
  • FIG. 6 is a cross-sectional view of the molding die 1 of the first embodiment of the present invention during the ejection operation of the molded product P. It is sectional drawing after the protrusion of the molded product P of the molding die 1 of 1st Embodiment of this invention. It is sectional drawing in the middle of the mold clamping of the metal mold
  • FIG. 1 is a sectional view showing the overall structure of a molding die 1 according to a first embodiment of the present invention
  • FIG. 2 is an external view of a holder 20, a holding piece 30, and a sliding piece 50 of the molding die 1.
  • FIG. 3 is a view showing a state in which the holding piece 30 and the sliding piece 50 are incorporated in the holder 20 of the molding die 1.
  • 4A and 4B are views for explaining the operation of the undercut processing mechanism 11 of the molded product P of the molding die 1.
  • FIG. 4A is at the time of mold clamping
  • FIG. 4B is a holding piece 30 and a sliding piece 50.
  • (C) is when the molded product P is ejected when the connection with is disconnected.
  • 5 and 6 are sectional views of the molding die 1 during the ejection operation of the molded product P.
  • 7 to 9 are a cross-sectional view of the molded product P of the molding die 1 after being ejected, a cross-sectional view during mold clamping, and a cross-sectional view during mold clamping.
  • FIGS. 2 to 9 the description of the fixed mold is omitted in FIGS. 2 to 9, and FIGS. 2 to 4 are different in viewing direction (front and back) from other drawings. .. Further, except for FIG. 4, the description of the ball plunger 90 and the concave portion 65 is omitted.
  • the molding die 1 of the first embodiment of the present invention includes a fixed mold 101 for molding the outer surface side of the molded product P and a movable mold for molding the inner surface side of the molded product P, similarly to a known injection molding mold. 151 and an undercut processing mechanism 11 are further provided.
  • the fixed mold 101 side in FIG. 1 will be described as the upper side and the movable mold 151 side as the lower side.
  • the left side means the left side in FIG. 1 and the right side means the opposite side, unless otherwise specified.
  • the fixed mold 101 has a cavity 106 for molding the outer surface side of the molded product P.
  • the movable mold 151 includes a movable mold plate 161 having a core 162 for molding the inner surface side of the molded product P, a movable side mounting plate 180, a spacer block 181, two ejector base plates 191, ejector pins 192, a return pin 195.
  • the spring 197 and the ejector rod 198 are provided, and the ejector base plate 191, the ejector pin 192, the ejector rod 198 and the like constitute an ejector mechanism 190.
  • the ejector mechanism 190 is a one-step ejection mechanism.
  • the molding die 1 opens the mold through the molding process and the cooling process, and the ejector base plate 191 approaches the movable side mold plate 161 which is the mold cutting direction (upward direction, Y direction in FIG. 1) of the molded product P. In this manner, the ejector pin 192 ejects the molded product P.
  • the above-mentioned components and operations are the same as those of a known injection molding die, and a description thereof will be omitted.
  • the undercut portion P1 is a protruding portion P1 that protrudes from the end of the molded product P to the inside of the molded product P, and intersects the die-cutting direction (Y direction) of the molded product P.
  • the molded product P shown in the present embodiment has a protruding portion P2 protruding inward of the molded product P at the tip in the direction of removing the undercut portion P1 (X direction).
  • the shapes of the molded product P, the protruding portion P1, and the protruding portion P2 are not particularly limited, and the material of the molded product P is not limited to synthetic resin such as plastic, but may be metal such as iron, copper, or aluminum.
  • the undercut processing mechanism 11 forms the undercut portion P1 at the time of molding the molded product P, synchronizes with the ejector mechanism 190, and comes off from the undercut portion P1 when the molded product P is ejected.
  • the mold 1 can be removed from the mold.
  • the undercut processing mechanism 11 includes a holder 20 that is embedded and fixed in the movable mold plate 161, a molding core 80 that molds the undercut portion P1 of the molded product P, and a sliding piece 50 that supports and fixes the molding core 80. And a holding piece 30 for slidably holding the sliding piece 50.
  • the holder 20 is fitted into a concave portion 164 provided so as to face the bottom surface 163 in the movable side mold plate 161, and is embedded and fixed in the movable side mold plate 161 via a fixed plate 165.
  • the holder 20 accommodates the sliding piece 50 and the holding piece 30 and regulates the moving directions of the sliding piece 50 and the holding piece 30.
  • the holder 20 is formed by combining two half-split holder members 21 each having a U-shaped cross section, has a box shape with an open upper surface and a lower surface, and has an internal space capable of accommodating the holding piece 30 and the sliding piece 50. (See FIGS. 2 and 3).
  • the holder 20 may be formed by being divided into a plurality of members, or may be integrally formed with the movable-side template 161.
  • the holder 20 has a vertical groove 27 that guides the holding piece 30 and a slant groove 28 that guides the sliding piece 50 on two opposing inner wall surfaces 22 and 23 parallel to the plane including the X axis and the Y axis.
  • an upper surface of the inner wall surface 25 is provided with an inclined surface 26 parallel to the oblique groove 28 so as to be along the oblique groove 28.
  • the vertical groove 27 is provided in parallel with the mold opening direction (Y direction) of the molding die 1, and a ridge 38 provided on a holding piece 30 described later is slidably fitted therein.
  • the vertical groove 27 is a guide unit that guides the holding piece 30 that advances and retracts in synchronization with the ejector mechanism 190 in the protruding direction of the molded product P.
  • the vertical groove 27 also functions as a posture holding unit that holds the posture of the holding piece 30 in cooperation with the protrusion 38 provided on the holding piece 30. This point will be described later.
  • the vertical groove 27 is provided on each of the two facing inner wall surfaces 22 and 23, but may be provided on the inner wall surface 24 parallel to the plane including the Y axis and the Z axis.
  • the ridge 38 of the holding piece 30 may be provided on the side surface 35.
  • the oblique groove 28 is provided so as to be inclined with respect to the mold opening direction (Y direction) of the molding die 1, and a ridge 59 provided on a sliding piece 50 described later is slidably fitted therein.
  • the oblique groove 28, in synchronization with the ejector mechanism 190, regulates the moving direction of the sliding piece 50 in a direction (X direction) in which the molding core 80 connected to the sliding piece 50 is disengaged from the undercut portion P1.
  • the direction in which the molding core 80 is disengaged from the undercut portion P1 is the direction in which the molding core 80 is disengaged from the undercut portion P1 without deforming or damaging the undercut portion P1.
  • the inclined groove 28 of the holder 20 corresponds to the shape of the undercut portion P1 of the molded product P, in particular, the amount of protrusion of the undercut portion P1 in the X direction and the stroke of the protruding pin 200 when the molded product P is ejected. It is determined that the molding core 80 is removed from the undercut portion P1 of the molded product P.
  • the shape of the holder 20 is not limited to a particular shape, and the molding core 80 molds the undercut portion P1 when molding the molded product P, and the molding core 80 moves from the undercut portion P1 when the molded product P is ejected. It suffices if the moving directions of the sliding piece 50 and the holding piece 30 can be regulated so as to come off. Further, the holder 20 preferably has a function of holding the position/posture of the sliding piece 50 and the posture of the holding piece 30 like the undercut processing mechanism 11 of the present embodiment.
  • the holding piece 30 has a substantially rectangular parallelepiped main body 31, and a ridge 40 is provided on an upper surface 32 of the main body 31.
  • a ridge 40 is provided on an upper surface 32 of the main body 31.
  • FIG. 2 at the left end of the wall surface 33 on the front side of the main body 31 and the left end of the wall surface on the back side, there are provided ridges 38 slidably fitted into the vertical grooves 27 provided in the holder 20.
  • the width (X direction) of the main body 31 is smaller than the width (X direction) of the internal space of the holder 20 (see FIG. 3 ).
  • a corner C1 where the upper surface 32 and the side surface 36 of the main body 31 intersect each other is chamfered to prevent the sliding piece 50 from being caught.
  • the ridge 40 is a member extending in the X direction and slidably retained by the claw 60 provided on the sliding piece 50.
  • the length of the ridge 40 is the same as the width of the inner space of the holder 20, and one end of the ridge 40 is attached to the inner wall surface 24 of the holder 20 while the holding piece 30 is assembled in the holder 20.
  • the other end 44 of each of them slidably contacts the inner wall surface 25 of the holder 20. Since the length of the ridge 40 is longer than the width of the main body 31, a part of the ridge is a protruding portion 45 protruding from the main body 31 (see FIG. 3 ).
  • the upper portion 42 is wider than the lower portion 41 and has a T-shape. Since the width of the lower portion of the ridge 40 (Z direction) is smaller than the thickness of the upper surface 32 of the main body 31 (Z direction), a dovetail groove 46 is formed between the main body 31 and the ridge 40. The claw 60 provided on the sliding piece 50 is slidably locked in the dovetail groove 46.
  • the holding piece 30 is accommodated in the holder 20 by connecting the ejection pin 200 fixed to the ejector base plate 191 to the bottom surface 37.
  • the ridge 38 is slidably fitted in the vertical groove 27 of the holder 20, and is projected by the ejection pin 200 to advance and retreat in the die cutting direction (Y direction).
  • the sliding piece 50 has a main body 51 made of a linear rod member having a substantially rectangular cross section, and an attachment portion 68 for attaching the molding core 80 is provided on the upper surface 52 of the main body 51.
  • the cross section of the main body 51 is not limited to the rectangular shape, and may have any other shape as long as the projection 59, the claw 60, the opening 62, and the contact surfaces 58 and 72 described below can be provided.
  • the main body 51 has a top surface 52 and a bottom surface 53 parallel to each other, and when the top surface 52 is horizontal, side surfaces 54 and 55 parallel to a plane including the X axis and the Y axis are inclined (see FIG. 2). Further, a contact surface 58 is provided below the inclined surface 56 among the inclined surfaces 56 and 57 which are surfaces orthogonal to the side surface 54.
  • the contact surface 58 constitutes a first position/orientation holding unit together with a contact surface 72 provided on a stopper 70 described later.
  • the contact surface 58 is a surface parallel to a plane including the Y axis and the Z axis (see FIG. 2), and is attached to the side surface 36 of the holding piece 30 in a state where the sliding piece 50 and the holding piece 30 are incorporated in the holder 20. Parallel.
  • the contact surface 58 contacts the side surface 36 of the holding piece 30 when the connection between the holding piece 30 and the sliding piece 50 is released and the holding piece 30 rises, so that the position/posture of the sliding piece 50 is maintained. It functions (see FIG. 4C).
  • the connection between the holding piece 30 and the sliding piece 50 is released, the sliding piece 50 moves and the claws of the sliding piece 50 are moved as shown in FIGS. 4(B) and 4(C).
  • the state where 60 is completely disengaged from the dovetail groove 46.
  • a corner portion C2 where the contact surface 58 and the bottom surface 53 intersect each other is chamfered to prevent biting with the holding piece 30.
  • the sliding piece 50 when the claw 60 of the sliding piece 50 is fitted in the dovetail groove 46, the sliding piece 50 is in a state of being slidably connected to the holding piece 30 and integrated with the holding piece 30. Move to.
  • the claw 60 of the sliding piece 50 when the claw 60 of the sliding piece 50 is completely disengaged from the dovetail groove 46 and the claw 60 is located at the projecting portion 45 of the ridge 40, the sliding piece 50 and the holding piece 30 are in the disengaged state, and the holding piece Even if 30 rises, the sliding piece 50 does not rise.
  • each of the side surface 54 and the side surface 55 of the main body 51 is provided with a ridge 59 on the inclined surface 57 side.
  • the ridge 59 is slidably fitted in the slant groove 28 provided in the holder 20.
  • a pair of claws 60 are provided at the lower end of the sliding piece 50 at intervals in the front-back direction (Z direction) of FIG.
  • the pair of claws 60 are formed by providing an opening 62 connected to the bottom surface 53 and the contact surface 58 at the lower part of the inclined surface 56.
  • the opening 62 includes a first opening 63 connected to the bottom surface 53 and a second opening 64 located above the first opening 63 and connected to the first opening 63.
  • the width (Z direction) of the second opening 64 is made wider than the width of the first opening 63 (Z direction), and a step is provided at the boundary between the first opening 63 and the second opening 64. Claws 60 are formed.
  • the height of the first opening 63 (Y direction) is the height of the claw 60, and this height is the height that is slidably fitted into the dovetail groove 46 provided in the holding piece 30. Further, the width (Z direction) of the first opening portion 63 becomes the interval (gap) between the pair of claws 60, and this width is substantially the same as the width (Z direction) of the lower portion 41 of the ridge 40 provided on the holding piece 30.
  • the pair of claws 60 are slidably fitted into the front and rear dovetail grooves 46. The distance between the pair of claws 60 is smaller than the width of the upper surface 32 of the holding piece 30 (Z direction) and the width of the second opening 64 (Z direction).
  • the left side ( ⁇ X direction) in FIG. 2 is connected to the contact surface 58, the lower end on the right side is connected to the right end (the inclined surface 57 side) of the first opening 63, and the upper surface is connected to the inclined surface 56.
  • the width (Z direction) of the second opening 64 is set larger than the width (Z direction) of the upper portion 42 of the ridge 40, and the ridge 40 can pass through the second opening 64.
  • the second opening 64 can be referred to as an avoidance groove that prevents the protrusion 45 of the ridge 40 from colliding with the sliding piece 50.
  • the form of the pair of claws 60 is not limited to the above embodiment.
  • the pawl 60 is slidably fitted into the dovetail groove 46 of the holding piece 30, and when the pawl 60 moves to the projecting portion 45 of the convex strip 40, if the holding piece 30 can move upward and cannot move downward.
  • part of the claw 60 may protrude in the ⁇ X direction, and the width of the second opening 64 (Z direction) may be the same as the width of the inclined surface 56 (Z direction). ..
  • the sliding piece 50 is housed in the holder 20 with the lower end claw 60 fitted in the dovetail groove 46 of the holding piece 30 and the convex strip 59 fitted in the slant groove 28 of the holder 20, and the sliding piece 50 has a Y-shape. It moves along the oblique groove 28 of the holder 20 in conjunction with the movement in the direction.
  • a stopper 70 is provided at the lower end of the inclined surface 57 of the sliding piece 50.
  • the stopper 70 has a contact surface 72 (see FIG. 4).
  • the contact surface 72 is a surface parallel to a plane including the Y axis and the Z axis, and is parallel to the inner wall surface 25 of the holder 20 when the sliding piece 50 and the holding piece 30 are incorporated in the holder 20.
  • the contact surface 72 contacts the inner wall surface 25 of the holder 20 when the sliding piece 50 moves and is disconnected from the holding piece 30, and thereafter holds the position and posture of the sliding piece 50 (FIG. 4 (B)). Further, when the connection between the holding piece 30 and the sliding piece 50 is released and the holding piece 30 rises, the contact surface 72 sandwiches the lower part of the sliding piece 50 with the contact surface 58 and the position of the sliding piece 50. Hold the posture.
  • the molding core 80 is a block member having a shape along a part of the molded product P including the undercut portion P1, and is fixed to the mounting portion 68 of the sliding piece 50.
  • the shape of the molding core 80 is determined according to the shape of the molded product P.
  • the molding core 80 may be formed integrally with the sliding piece 50.
  • the undercut processing mechanism 11 of the present embodiment is provided with a second position/orientation holding means composed of a ball plunger 90 mounted on the holder 20 and a recess 65 into which the ball 91 of the ball plunger 90 is fitted.
  • the second position/orientation holding means is a member that holds the position/orientation of the sliding piece 50 when and after the connection between the holding piece 30 and the sliding piece 50 is released.
  • the ball plunger 90 is mounted on the inclined surface 26 so that the ball 91 projects from the inclined surface 26.
  • the recessed portion 65 is the inclined surface 57 of the main body 51 of the sliding piece 50, and is provided at a position where the ball 91 of the ball plunger 90 fits when the sliding piece 50 moves and the connection with the holding piece 30 is released. (See FIG. 4B).
  • the ball plunger 90 used here is a bottomed cylindrical main body, a ball 91 arranged in the main body so as not to come off from the tip of the main body, and a compression coil spring arranged in the main body for urging the ball 91 in the front end direction.
  • This is a well-known ball plunger configured and holds the position/posture of the sliding piece 50 by fitting the ball 91 into the recess 65.
  • the ball plunger 90 is mounted on the inclined surface 26 of the holder 20, but the mounting position of the ball plunger 90 is not particularly limited.
  • a ball plunger 90 may be attached to the side surface 36 of the holding piece 30 and the ball 91 may be locked to the contact surface 58 of the sliding piece 50.
  • the number of ball plungers 90 mounted is not limited to one, but two or more may be mounted.
  • the ball plunger 90 is used as the locking means that locks the sliding piece 50 with the holder 20, which constitutes the position/orientation holding means.
  • the ball plunger 90 is detachably fitted into the recess 65.
  • An elastic body having a leaf spring to be inserted and a convex portion to be detachably fitted in the concave portion 65 may be used.
  • the second position/orientation holding means is provided on one or more of the sliding piece 50, the holder 20, and the holding piece 30, and when the holding piece 30 and the sliding piece 50 are released from each other and thereafter.
  • the sliding piece 50 is detachably locked to the holder 20, the holding piece 30, or the holder 20 and the holding piece 30 to hold the position/posture of the sliding piece 50 after the connection with the holding piece 30 is released. I wish I could.
  • the undercut processing mechanism 11 of the present embodiment includes the first position/orientation holding means configured by the two contact surfaces 58 and 72 capable of sandwiching the lower portion of the sliding piece 50 from the front and the back, it is the second It is also possible to omit the position and orientation holding means.
  • the second position/orientation holding means having a structure different from that of the first position/orientation holding means, the position/orientation of the sliding piece 50, which is disconnected from the holding piece 30, is held more reliably. be able to.
  • the operation and action of the molding die 1 of the present embodiment will be described by taking the case where the molded product P is molded by injection molding in the molding die 1 as an example.
  • the sliding piece 50 is housed in the holder 20 provided inside the movable mold plate 161, and the molding core 80 is positioned so as to mold the undercut portion P1 of the molded product P (see FIG. 1, FIG. 4(A)).
  • the parting surfaces (PL surfaces) of the fixed mold 101 and the movable mold 151 are matched, and the molten material is injected to mold the molded product P.
  • the mold is opened and the process of taking out the molded product P is started.
  • the operation of the molding die 1 in the take-out step is as follows.
  • the ejector rod 198 is pushed out through the ejecting device (not shown), and the ejector base plate 191 moves upward (Y direction) (see FIG. 5). Along with this, the ejector pins 192 erected on the ejector base plate 191 project the molded product P in the Y direction.
  • the holding piece 30 housed in the holder 20 is ejected by the ejection pin 200 and moved in the Y direction by the same amount as the ejector pin 192.
  • the sliding piece 50 that holds the claw 60 in the dovetail groove 46 of the holding piece 30 extends from the molding position shown in FIG. 1 along the oblique groove 28 in the holder 20. Moving.
  • the molding core 80 simultaneously moves in the Y direction and the X direction and moves away from the undercut portion P1 (see FIG. 5).
  • the molding core 80 is completely removed from the undercut portion P1.
  • the molded product P has not reached the position where it can be taken out from the fixed mold 151. Therefore, the ejector base plate 191 continues to rise, and the ejector pin 192 continues to protrude the molded product P while being in contact with the inside of the molded product P.
  • the holding piece 30 and the sliding piece 50 also rise as the ejector base plate 191 rises.
  • the contact surface 72 of the stopper 70 of the sliding piece 50 simultaneously contacts the inner wall surface 25 of the holder 20. Further, the ball 91 of the ball plunger 90 fits into the concave portion 65 of the sliding piece 50 (see FIG. 4(B) and FIG. 5). Although the connection between the sliding piece 50 and the holding piece 30 is released by this, the sliding piece 50 is brought into contact with the inner wall surface 25 by the contact and the ball plunger 90 connects the sliding piece 50 and the holder 20. 50 positions/postures are retained. At this point, the contact surface 58 of the sliding piece 50 is not in contact with the side surface 36 of the holding piece 30.
  • the ejector base plate 191 rises, and the ejector pin 192 continues to eject the molded product P while being in contact with the inside of the molded product P. Further, the holding piece 30 ascends integrally with the ejector base plate 191 because the protrusion 45 can pass through the second opening 64 of the sliding piece 50. On the other hand, when the ejector base plate 191 reaches the point H2, the sliding piece 50 cannot be further raised because it is no longer connected to the holding piece 30, and even if the holding piece 30 is further raised, 80 does not collide with the projection P2 of the molded product P.
  • the holding piece 30 is in a state in which the side surface 36 of the holding piece 30 is in contact with the contact surface 58 of the sliding piece 50 in the process in which the ejector base plate 191 further rises beyond the point H2, and thereafter the surfaces are slid with each other.
  • the holding piece 30 moves up.
  • the contact surface 72 of the sliding piece 50 contacts the inner wall surface 25 of the holder 20, and the ball 91 of the ball plunger 90 is fitted in the recess 65 of the sliding piece 50, the position of the sliding piece 50 is changed. -The posture can be held more reliably.
  • the mold die 1 After taking out the molded product P, the mold die 1 is clamped again to mold the next molded product P. During mold clamping, the entire movable die 151 moves toward the fixed die 101, and the ejector base plate 191 moves away from the movable side die plate 161. In the undercut processing mechanism 11, the holding piece 50 moves in the opposite direction to the tip in conjunction with the movement of the ejector base plate 191.
  • the projecting portion 45 of the projection 40 of the holding piece 30 contacts the claw 60 of the holding piece 50. Since the width of the upper portion 42 of the protrusion 45 is wider than the distance between the pair of claws 60, when the ejector base plate 191 further descends, the protrusion 45 is locked to the claw 60, and the sliding piece 50 is moved by the protrusion 45. Pushed down. As a result, the claw 60 enters the dovetail groove 46, the sliding piece 50 further descends along the oblique groove 28, and the upper surface 81 of the molding core 80 finally becomes flush with the upper surface of the movable side mold plate 161 (see FIG. 9).
  • the molding material is injected and the next molded product P is molded.
  • the basic operation of the molding die 1 from the opened state to the mold clamping is the same as that of the conventional molding die having the undercut processing mechanism.
  • the holding piece 30 moves upward while sliding in the holder 20 in association with the movement of the ejector mechanism 190. Since the moving piece 50 is guided by the holder 20 and the molding core 80 moves so as to be separated from the undercut portion P1, the undercut portion P1 can be easily and reliably pulled out while having a compact and simple structure.
  • the molding die 1 and the undercut processing mechanism 11 of the first embodiment are provided with a detaching mechanism that releases the connection between the holding piece 30 and the sliding piece 50 when the sliding piece 50 moves to the specified position. If the defined position is set to the position where the undercut portion P1 comes off, the sliding piece 50 and the holding piece 30 can be separated after moving the molding core 80 so that the undercut portion P1 comes off. Therefore, even a molded product P having the protruding portion P2 at the tip of which the undercut portion P1 has been removed can be easily and reliably die-cut by a single-stage protruding operation. Further, by separating the sliding piece 50 and the holding piece 30, the thrust amount of the ejector mechanism 190 can be set large.
  • the molding die 1 and the undercut processing mechanism 11 of the first embodiment since the position/posture holding means of the sliding piece 50 and the posture holding means of the holding piece 30 are provided, the sliding piece 50, The position/orientation of each of the holding pieces 30 can be restricted, and the position/orientation can be reliably held.
  • the undercut processing mechanism 11 of the first embodiment can be assembled in the molding die 1 with the sliding piece 50 and the holding piece 30 housed in the holder 20, it can be configured compactly, and It can be easily attached to the molding die 1. In particular, if the holder 20, the holding piece 30, the sliding piece 50, and the molding core 80 are combined into one unit, the attachment to the molding die 1 becomes easier.
  • the undercut processing mechanism, the molding die and the molded product of the present invention have been described above by using the molding die 1 of the first embodiment. However, the undercut processing mechanism, the molding die and the molding of the present invention have been described.
  • the product is not limited to the above-mentioned embodiment, and can be modified and used without changing the gist. In the above-described embodiment, the position H1 at which the molding core 80 is disengaged from the undercut P1 and the position H2 at which the connection between the sliding piece 50 and the holding piece 30 is released are different, but even if this position is the same. Good.
  • the holding piece 30 is provided with the ridge 38 and the holder 20 is provided with the vertical groove 27, but the holding piece 30 may be provided with the vertical groove and the holder 20 may be provided with the ridge.
  • the undercut processing mechanism of the present invention can be incorporated in the fixed die 101 instead of the movable die 151.
  • the cross-sectional shape of the vertical groove 27, the oblique groove 28, the ridges 38 and 59, the fitting portion or the engaging portion which are fitted or engaged with each other is the rectangle shown in the drawing.
  • the cross section may be circular, triangular or the like.
  • the guide means for restricting the movement of each of the holder 20, the holding piece 30, and the sliding piece 50 is not limited to that of the above embodiment, and for example, a linear guide or the like. May be used.
  • corner portions C1 and C2 are chamfered to prevent biting.
  • C chamfering may be applied.
  • each constituent member used in the undercut processing mechanism and the molding die of the present invention is not limited to a specific material, and a member used in a known undercut processing mechanism and a molding die.
  • the same material as the above may be appropriately used.
  • each sliding surface is not limited to a surface contact, and may be a line contact or a point contact.
  • the undercut processing mechanism of the present invention can be applied to a molding die that opens and closes horizontally, vertically, or in other directions.
  • the undercut processing mechanism of the present invention may be incorporated in the molding die one, or two or three or more. Even if the molding die includes two or more undercut processing mechanisms of the present invention, only one ejector mechanism is required, and the molded product can be ejected by a single-step ejection operation.
  • undercut processing mechanism and the molding die of the present invention can be suitably used for molding dies such as die casting dies, mold press molding dies, etc. in addition to the injection dies.

Abstract

Provided are a compact undercut processing mechanism whereby a molded article can be easily released even when the molded article has a portion that protrudes in the direction in which an undercut part is removed, a molding die, and a molded article.　The present invention provides an undercut processing mechanism 11 used while attached to a fixed mold or movable mold of a molding die for molding a molded article having an undercut part, the undercut processing mechanism 11 being provided with: a sliding piece 50 provided with a molding core 80 for molding the undercut part, the sliding piece 50 linking to a retaining piece 30 and advancing and retreating; a holder 20 provided with a guide means for guiding the sliding piece 50 so that the molding core 80 separates from the undercut part; a retaining piece 30 guided by the holder 20, the retaining piece 30 linking to an ejector mechanism and advancing and retreating; and a connecting means for slidably connecting the retaining piece 30 and the sliding piece 50; the connecting means being provided with a separation mechanism for disconnecting the retaining piece 30 and the sliding piece 50 when the sliding piece 50 moves to a prescribed position.

Description

アンダーカット処理機構、成形用金型及び成形品Undercut processing mechanism, molding die and molded product
　本発明は、アンダーカット部を有する成形品を成形する成形用金型に取付け使用されるアンダーカット処理機構、成形用金型及び成形品に関する。 The present invention relates to an undercut processing mechanism, a molding die and a molded product that are used by being attached to a molding die for molding a molded product having an undercut portion.
　アンダーカット部を有する成形品を成形する成形用金型において、アンダーカット部を含む成形品の形態により、１段の突き出し操作で成形用金型から成形品を取り外すことができない場合には、突き出し工程を２段で行う２段突き出し機構が用いられる。 In a molding die for molding a molded article having an undercut portion, if the molded article cannot be removed from the molding die by a single-step ejection operation due to the shape of the molded article including the undercut portion, ejection A two-stage ejecting mechanism that performs the process in two stages is used.
　例えば、アンダーカット部を抜く方向の先に突出した部位がある成形品を、ホルダー、保持駒、摺動駒及び成形駒がユニット化されたアンダーカット処理機構を備える成形用金型で成形する場合、１回の突き出し操作では、アンダーカットの抜き方向にスライドした成形駒が突出した部位に衝突し、成形用金型から成形品をうまく取り外すことができない。このような成形品の成形には、特許文献１で示されるようなアンダーカット処理機構及び２段突出し機構を備える成形用金型が使用される。 For example, when molding a molded product that has a protruding part in the direction of pulling out the undercut part with a molding die that has an undercut processing mechanism in which a holder, a holding piece, a sliding piece, and a molding piece are unitized. In one ejection operation, the molding piece that slides in the undercut removal direction collides with the protruding portion, and the molded product cannot be removed from the molding die properly. A molding die including an undercut processing mechanism and a two-step protruding mechanism as shown in Patent Document 1 is used for molding such a molded product.
特開２０１４－９７６２８号公報JP, 2014-97628, A
　２段突き出し機構は、１段の突出し機構に比較して部品数も多く構造も複雑であり、必然的に成形用金型が大きくなる。今日、成形用金型のコンパクト化、軽量化に対する要求は強く、アンダーカット部を抜く方向の先に突出した部位を有する成形品においても１段の突き出し操作で成形できる成形用金型の開発が待たれている。 The two-stage ejection mechanism has a larger number of parts and a more complicated structure than the one-stage ejection mechanism, and the molding die is inevitably large. Today, there is a strong demand for compact and lightweight molding dies, and the development of molding dies that can be molded with a single-step ejection operation even for molded products that have parts that protrude forward in the direction of removing the undercut part. I'm waiting.
　本発明の目的は、アンダーカット部を抜く方向の先に突出した部位を有するような成形品であっても容易に型抜きすることができるコンパクトなアンダーカット処理機構、成形用金型及び成形品を提供することである。 An object of the present invention is to provide a compact undercut processing mechanism, a molding die, and a molded product that can be easily die-cut even if the molded product has a portion that protrudes in the direction of removing the undercut portion. Is to provide.
　本発明は、アンダーカット部のある成形品を成形する、前記成形品を突き出すエジェクタ機構を備える成形用金型の固定型又は可動型に取付け使用されるアンダーカット処理機構であって、前記アンダーカット部を成形する成形コアを備え、保持駒に連係し進退する摺動駒と、前記固定型又は前記可動型に固定され又は前記固定型又は前記可動型に一体的に設けられ、前記成形コアがアンダーカット部から外れるように前記摺動駒を案内するガイド手段を備えるホルダーと、前記ホルダーにガイドされ前記エジェクタ機構に連係し進退する保持駒と、前記保持駒と前記摺動駒とを摺動自在に連結する連結手段と、を備え、前記連結手段は、前記摺動駒が規定された位置まで移動すると、前記保持駒と前記摺動駒との連結を解く離脱機構を備えることを特徴とするアンダーカット処理機構である。 The present invention relates to an undercut processing mechanism for forming a molded product having an undercut portion, which is used by being attached to a fixed mold or a movable mold of a molding die including an ejector mechanism for ejecting the molded product, And a sliding piece that moves forward and backward in association with a holding piece, and is fixed to the fixed die or the movable die or is integrally provided on the fixed die or the movable die. A holder provided with a guide means for guiding the sliding piece so as to be separated from the undercut portion, a holding piece guided by the holder and moving forward and backward in association with the ejector mechanism, and a sliding movement of the holding piece and the sliding piece. A connecting mechanism that freely connects, and the connecting means includes a releasing mechanism that releases the connection between the holding piece and the sliding piece when the sliding piece moves to a specified position. This is an undercut processing mechanism.
　本発明のアンダーカット処理機構において、前記保持駒は、本体の先端に進退方向と交差する方向に伸びる、爪が係止可能な凸条を有し、前記凸条の一部は、前記本体の側面から突出した突出部であり、前記保持駒の本体と前記凸条との間に前記爪が摺動自在に嵌り込む蟻溝が設けられ、前記摺動駒は、前記爪を有し、前記爪の上方は開口し、前記凸条の突出部は、前記爪の上方に移動可能でかつ前記爪の下方に移動不能であり、前記連結手段が、前記凸条と前記蟻溝と前記爪とで構成されてなることを特徴とする。 In the undercut processing mechanism of the present invention, the holding piece has a protrusion that extends in a direction intersecting the advancing/retreating direction at the tip of the main body, and a claw that can be locked, and a part of the protrusion is a portion of the main body. A projecting portion projecting from a side surface, a dovetail groove into which the claw is slidably fitted is provided between the main body of the holding piece and the convex strip, and the sliding piece has the claw and the claw Is open, and the protruding portion of the convex strip is movable above the pawl and immovable below the pawl, and the connecting means includes the convex strip, the dovetail groove, and the pawl. It is characterized by being configured.
　本発明のアンダーカット処理機構は、さらに前記保持駒との連結が解かれた前記摺動駒の位置、その姿勢を保持する１以上の位置姿勢保持手段を備えることを特徴とする。 The undercut processing mechanism of the present invention is characterized by further comprising one or more position/orientation holding means for holding the position and orientation of the sliding piece that has been disconnected from the holding piece.
　本発明のアンダーカット処理機構において、前記位置姿勢保持手段は、前記摺動駒に設けられた２つの当接面を備え、第１の当接面は、前記ホルダーの側面内壁に当接する該側面内壁に平行な面であり、第２の当接面は、前記保持駒の本体側面に当接する該本体側面に平行な面であり、前記第１の当接面が前記ホルダーの側面内壁に当接し、前記第２の当接面が前記保持駒の本体側面に当接し、前記摺動駒の位置、その姿勢を保持することを特徴とする。 In the undercut processing mechanism of the present invention, the position/orientation holding means includes two abutting surfaces provided on the sliding piece, and the first abutting surface is a side surface that abuts an inner wall of a side surface of the holder. The second contact surface is a surface parallel to the inner wall, and the second contact surface is a surface parallel to the main body side surface that contacts the main body side surface of the holding piece, and the first contact surface contacts the side surface inner wall of the holder. The second contact surface contacts the side surface of the main body of the holding piece to hold the position and posture of the sliding piece.
　本発明のアンダーカット処理機構において、前記位置姿勢保持手段は、前記摺動駒、前記ホルダー、前記保持駒のうち１以上に設けられ、前記保持駒との連結が解かれた前記摺動駒を前記ホルダー、又は前記保持駒、又は前記ホルダーと前記保持駒とに着脱自在に係止させる係止手段であることを特徴とする。 In the undercut processing mechanism of the present invention, the position/orientation holding means is provided in at least one of the sliding piece, the holder, and the holding piece, and the sliding piece that is disconnected from the holding piece is It is characterized in that it is a locking means for removably locking the holder, the holding piece, or the holder and the holding piece.
　本発明のアンダーカット処理機構において、前記係止手段が、ボールプランジャ、又は板ばね、又は凹部に着脱自在に嵌り込む凸部を有する弾性体であることを特徴とする。 In the undercut processing mechanism of the present invention, the locking means is a ball plunger, a leaf spring, or an elastic body having a convex portion that is detachably fitted into the concave portion.
　本発明のアンダーカット処理機構は、さらに前記ホルダーに対する前記保持駒の姿勢を保持する姿勢保持手段を備えることを特徴とする。 The undercut processing mechanism of the present invention is characterized by further including a posture holding means for holding the posture of the holding piece with respect to the holder.
　本発明のアンダーカット処理機構において、前記姿勢保持手段は、凸条と前記凸条が摺動自在に嵌り込む溝とで構成され、前記ホルダーの内壁面及び前記保持駒それぞれに前記凸条及び溝のいずれか一方が設けられていることを特徴とする。 In the undercut processing mechanism of the present invention, the posture maintaining means includes a ridge and a groove into which the ridge is slidably fitted, and the ridge and the groove are respectively formed on the inner wall surface of the holder and the holding piece. One of the above is provided.
　本発明のアンダーカット処理機構は、前記ホルダーに少なくとも前記保持駒と前記摺動駒とが組み込まれユニット化されてなることを特徴とする。 The undercut processing mechanism of the present invention is characterized in that at least the holding piece and the sliding piece are incorporated into the holder to form a unit.
　本発明のアンダーカット処理機構において、前記保持駒の本体の上面と側面との角部のうち少なくとも前記保持駒との連結が解かれた前記摺動駒と対向する角部、及び前記摺動駒の本体の底面と側面との角部のうち少なくとも前記摺動駒との連結が解かれた前記保持駒と対向する角部には、互いの噛みつきを防ぐ面取りが施されていることを特徴とする。 In the undercut processing mechanism of the present invention, of the corners of the upper surface and the side surface of the main body of the holding piece, at least the corner facing the sliding piece whose connection with the holding piece is released, and the main body of the sliding piece. Of the corners of the bottom surface and the side surfaces of the above, at least the corners facing the holding piece that has been disconnected from the sliding piece are chamfered so as to prevent them from biting each other.
　また本発明は、前記アンダーカット処理機構を１以上備える可動型又は固定型である。 Further, the present invention is a movable type or a fixed type including one or more of the undercut processing mechanism.
　また本発明は、前記アンダーカット処理機構を１以上備える備える成形用金型である。 The present invention is also a molding die including at least one undercut processing mechanism.
　また本発明は、前記アンダーカット処理機構、又は前記可動型又は固定型、又は前記成形用金型で成形された成形品であって、前記アンダーカット部を抜く方向の先に突出した部位を有する成形品である。 Further, the present invention is a molded product molded by the undercut processing mechanism, the movable mold or the fixed mold, or the molding die, and has a portion protruding toward the tip in the direction of pulling out the undercut portion. It is a molded product.
　本発明によれば、アンダーカット部を抜く方向の先に突出した部位を有するような成形品であっても容易に型抜きすることができるコンパクトなアンダーカット処理機構、成形用金型及び成形品を提供することができる。 According to the present invention, a compact undercut processing mechanism, a molding die, and a molded product that can be easily stamped even if the molded product has a portion that protrudes in the direction of pulling out the undercut portion Can be provided.
本発明の第１実施形態の成形用金型１の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of the metal mold|die 1 for 1st Embodiment of this invention. 本発明の第１実施形態の成形用金型１のホルダー２０、保持駒３０、摺動駒５０の外観図である。FIG. 3 is an external view of the holder 20, the holding piece 30, and the sliding piece 50 of the molding die 1 according to the first embodiment of the present invention. 本発明の第１実施形態の成形用金型１のホルダー２０に保持駒３０、摺動駒５０を組み込んだ状態を示す図である。It is a figure which shows the state which hold|maintained the holding piece 30 and the sliding piece 50 in the holder 20 of the metal mold|die 1 of 1st Embodiment of this invention. 本発明の第１実施形態の成形用金型１の成形品Ｐのアンダーカット処理機構１１の動作を説明するための図である。It is a figure for demonstrating operation|movement of the undercut process mechanism 11 of the molded product P of the molding die 1 of 1st Embodiment of this invention. 本発明の第１実施形態の成形用金型１の成形品Ｐの突き出し動作途中の断面図である。FIG. 6 is a cross-sectional view of the molding die 1 of the first embodiment of the present invention during the ejection operation of the molded product P. 本発明の第１実施形態の成形用金型１の成形品Ｐの突き出し動作途中の断面図である。FIG. 6 is a cross-sectional view of the molding die 1 of the first embodiment of the present invention during the ejection operation of the molded product P. 本発明の第１実施形態の成形用金型１の成形品Ｐの突き出し後の断面図である。It is sectional drawing after the protrusion of the molded product P of the molding die 1 of 1st Embodiment of this invention. 本発明の第１実施形態の成形用金型１の型締め途中の断面図である。It is sectional drawing in the middle of the mold clamping of the metal mold|die 1 for molding of 1st Embodiment of this invention. 本発明の第１実施形態の成形用金型１の型締め時の断面図である。It is sectional drawing at the time of mold clamping of the molding die 1 of 1st Embodiment of this invention.
　図１は、本発明の第１実施形態の成形用金型１の全体構成を示す断面図、図２は、成形用金型１のホルダー２０、保持駒３０、摺動駒５０の外観図、図３は、成形用金型１のホルダー２０に保持駒３０、摺動駒５０を組み込んだ状態を示す図である。図４は、成形用金型１の成形品Ｐのアンダーカット処理機構１１の動作を説明するための図であり、（Ａ）は型締め時、（Ｂ）は保持駒３０と摺動駒５０との連結が外れた時、（Ｃ）は成形品Ｐの突き出し時である。図５及び図６は、成形用金型１の成形品Ｐの突き出し動作途中の断面図である。図７から図９は、それぞれ成形用金型１の成形品Ｐの突き出し後の断面図、型締め途中の断面図、型締め時の断面図である。 FIG. 1 is a sectional view showing the overall structure of a molding die 1 according to a first embodiment of the present invention, and FIG. 2 is an external view of a holder 20, a holding piece 30, and a sliding piece 50 of the molding die 1. FIG. 3 is a view showing a state in which the holding piece 30 and the sliding piece 50 are incorporated in the holder 20 of the molding die 1. 4A and 4B are views for explaining the operation of the undercut processing mechanism 11 of the molded product P of the molding die 1. FIG. 4A is at the time of mold clamping, and FIG. 4B is a holding piece 30 and a sliding piece 50. (C) is when the molded product P is ejected when the connection with is disconnected. 5 and 6 are sectional views of the molding die 1 during the ejection operation of the molded product P. 7 to 9 are a cross-sectional view of the molded product P of the molding die 1 after being ejected, a cross-sectional view during mold clamping, and a cross-sectional view during mold clamping.
　本発明の第１実施形態の成形用金型１において、図２から図９では固定型の記載を省略し、図２から図４は、他の図とは見る方向（裏表）が異なっている。また図４を除きボールプランジャ９０及び凹部６５の記載を省略している。 In the molding die 1 of the first embodiment of the present invention, the description of the fixed mold is omitted in FIGS. 2 to 9, and FIGS. 2 to 4 are different in viewing direction (front and back) from other drawings. .. Further, except for FIG. 4, the description of the ball plunger 90 and the concave portion 65 is omitted.
　本発明の第１実施形態の成形用金型１は、公知の射出成形用金型と同様、成形品Ｐの外面側を成形する固定型１０１と、成形品Ｐの内面側を成形する可動型１５１と、さらにアンダーカット処理機構１１とを備える。便宜上、図１の固定型１０１側を上、可動型１５１側を下として説明する。また以下の説明において特に説明がない限り、左側とは図１における左側をいい、右側とはその反対側をいう。 The molding die 1 of the first embodiment of the present invention includes a fixed mold 101 for molding the outer surface side of the molded product P and a movable mold for molding the inner surface side of the molded product P, similarly to a known injection molding mold. 151 and an undercut processing mechanism 11 are further provided. For the sake of convenience, the fixed mold 101 side in FIG. 1 will be described as the upper side and the movable mold 151 side as the lower side. In the following description, the left side means the left side in FIG. 1 and the right side means the opposite side, unless otherwise specified.
　固定型１０１は、成形品Ｐの外面側を成形するキャビティ１０６を有する。可動型１５１は、成形品Ｐの内面側を成形するコア１６２を有する可動側型板１６１、可動側取付板１８０、スペーサーブロック１８１、２枚のエジェクタ台板１９１、エジェクタピン１９２、リターンピン１９５、スプリング１９７、エジェクタロッド１９８を備え、エジェクタ台板１９１、エジェクタピン１９２及びエジェクタロッド１９８等でエジェクタ機構１９０が構成される。このエジェクタ機構１９０は、一段の突き出し機構である。 The fixed mold 101 has a cavity 106 for molding the outer surface side of the molded product P. The movable mold 151 includes a movable mold plate 161 having a core 162 for molding the inner surface side of the molded product P, a movable side mounting plate 180, a spacer block 181, two ejector base plates 191, ejector pins 192, a return pin 195. The spring 197 and the ejector rod 198 are provided, and the ejector base plate 191, the ejector pin 192, the ejector rod 198 and the like constitute an ejector mechanism 190. The ejector mechanism 190 is a one-step ejection mechanism.
　成形用金型１は、成形工程、冷却工程を経て型開きを行い、エジェクタ台板１９１が成形品Ｐの型抜き方向（図１の上方向，Ｙ方向）である可動側型板１６１に近づくように移動することでエジェクタピン１９２によって成形品Ｐの突き出し動作を行う。なお上記の構成部品及び動作は、公知の射出成形用金型と同様であるため説明を省略する。 The molding die 1 opens the mold through the molding process and the cooling process, and the ejector base plate 191 approaches the movable side mold plate 161 which is the mold cutting direction (upward direction, Y direction in FIG. 1) of the molded product P. In this manner, the ejector pin 192 ejects the molded product P. The above-mentioned components and operations are the same as those of a known injection molding die, and a description thereof will be omitted.
　本実施形態においてアンダーカット部Ｐ１は、成形品Ｐの端部から成形品Ｐの内側に突出した突出部Ｐ１であり、成形品Ｐの型抜き方向（Ｙ方向）に対して交差している。また本実施形態に示す成形品Ｐは、アンダーカット部Ｐ１を抜く方向（Ｘ方向）の先端に成形品Ｐの内側に突出した突出部Ｐ２を有する。成形品Ｐ、突出部Ｐ１及び突出部Ｐ２の形状は特に限定されるものではなく、成形品Ｐの素材もプラスチック等の合成樹脂に限らず、鉄や銅、アルミニウム等の金属でも良い。 In the present embodiment, the undercut portion P1 is a protruding portion P1 that protrudes from the end of the molded product P to the inside of the molded product P, and intersects the die-cutting direction (Y direction) of the molded product P. Further, the molded product P shown in the present embodiment has a protruding portion P2 protruding inward of the molded product P at the tip in the direction of removing the undercut portion P1 (X direction). The shapes of the molded product P, the protruding portion P1, and the protruding portion P2 are not particularly limited, and the material of the molded product P is not limited to synthetic resin such as plastic, but may be metal such as iron, copper, or aluminum.
　アンダーカット処理機構１１は、成形品Ｐの成形時にアンダーカット部Ｐ１を成形し、エジェクタ機構１９０と同期し、成形品Ｐの突き出し時にアンダーカット部Ｐ１から外れることで、成形品Ｐを成形用金型１から型抜き可能とするものである。 The undercut processing mechanism 11 forms the undercut portion P1 at the time of molding the molded product P, synchronizes with the ejector mechanism 190, and comes off from the undercut portion P1 when the molded product P is ejected. The mold 1 can be removed from the mold.
　アンダーカット処理機構１１は、可動側型板１６１に埋設、固定されたホルダー２０と、成形品Ｐのアンダーカット部Ｐ１を成形する成形コア８０と、成形コア８０を支持固定する摺動駒５０と、摺動駒５０を摺動可能に保持する保持駒３０とを備える。 The undercut processing mechanism 11 includes a holder 20 that is embedded and fixed in the movable mold plate 161, a molding core 80 that molds the undercut portion P1 of the molded product P, and a sliding piece 50 that supports and fixes the molding core 80. And a holding piece 30 for slidably holding the sliding piece 50.
　ホルダー２０は、可動側型板１６１内の底面１６３に臨むように設けられた凹部１６４に嵌め込まれ、固定板１６５を介して可動側型板１６１に埋設、固定される。ホルダー２０は、摺動駒５０及び保持駒３０を収容し、摺動駒５０及び保持駒３０の移動方向を規制する。 The holder 20 is fitted into a concave portion 164 provided so as to face the bottom surface 163 in the movable side mold plate 161, and is embedded and fixed in the movable side mold plate 161 via a fixed plate 165. The holder 20 accommodates the sliding piece 50 and the holding piece 30 and regulates the moving directions of the sliding piece 50 and the holding piece 30.
　ホルダー２０は、断面がコ字状の２つの片割ホルダー部材２１を組合せてなり、上面及び下面が開口した箱形形状を有し、保持駒３０及び摺動駒５０を収容可能な内部空間を備える（図２、図３参照）。ホルダー２０は、複数の部材に分割して形成されていてもよく、可動側型板１６１に一体的に形成されていてもよい。 The holder 20 is formed by combining two half-split holder members 21 each having a U-shaped cross section, has a box shape with an open upper surface and a lower surface, and has an internal space capable of accommodating the holding piece 30 and the sliding piece 50. (See FIGS. 2 and 3). The holder 20 may be formed by being divided into a plurality of members, or may be integrally formed with the movable-side template 161.
　ホルダー２０は、Ｘ軸Ｙ軸を含む面に平行な対向する２つの内壁面２２、２３に、保持駒３０をガイドする縦溝２７と、摺動駒５０をガイドする斜溝２８とを有する。また内壁面２５の上部は、斜溝２８に沿うようにまた斜溝２８と平行な傾斜面２６が設けられている。 The holder 20 has a vertical groove 27 that guides the holding piece 30 and a slant groove 28 that guides the sliding piece 50 on two opposing inner wall surfaces 22 and 23 parallel to the plane including the X axis and the Y axis. In addition, an upper surface of the inner wall surface 25 is provided with an inclined surface 26 parallel to the oblique groove 28 so as to be along the oblique groove 28.
　縦溝２７は、成形用金型１の型開き方向（Ｙ方向）に平行に設けられ、後述する保持駒３０に設けられた凸条３８が摺動自在に嵌合する。縦溝２７は、エジェクタ機構１９０と同期して進退する保持駒３０を成形品Ｐの突き出し方向に案内するガイド手段である。また縦溝２７は、保持駒３０に設けられた凸条３８と協働して保持駒３０の姿勢を保持する姿勢保持手段としても機能する。この点は後述する。本実施形態では、縦溝２７は、対向する２つの内壁面２２、２３にそれぞれ設けられているが、Ｙ軸Ｚ軸を含む面に平行な内壁面２４に設けてもよい。この場合には、保持駒３０の凸条３８を側面３５に設ければよい。 The vertical groove 27 is provided in parallel with the mold opening direction (Y direction) of the molding die 1, and a ridge 38 provided on a holding piece 30 described later is slidably fitted therein. The vertical groove 27 is a guide unit that guides the holding piece 30 that advances and retracts in synchronization with the ejector mechanism 190 in the protruding direction of the molded product P. The vertical groove 27 also functions as a posture holding unit that holds the posture of the holding piece 30 in cooperation with the protrusion 38 provided on the holding piece 30. This point will be described later. In the present embodiment, the vertical groove 27 is provided on each of the two facing inner wall surfaces 22 and 23, but may be provided on the inner wall surface 24 parallel to the plane including the Y axis and the Z axis. In this case, the ridge 38 of the holding piece 30 may be provided on the side surface 35.
　斜溝２８は、成形用金型１の型開き方向（Ｙ方向）に対して傾斜して設けられ、後述する摺動駒５０に設けられた凸条５９が摺動自在に嵌合する。斜溝２８は、エジェクタ機構１９０と同期して、摺動駒５０に連結する成形コア８０がアンダーカット部Ｐ１から外れる方向（Ｘ方向）に摺動駒５０の移動方向を規制する。ここで成形コア８０がアンダーカット部Ｐ１から外れる方向とは、アンダーカット部Ｐ１を変形及び損傷させることなく成形コア８０がアンダーカット部Ｐ１から外れる方向である。 The oblique groove 28 is provided so as to be inclined with respect to the mold opening direction (Y direction) of the molding die 1, and a ridge 59 provided on a sliding piece 50 described later is slidably fitted therein. The oblique groove 28, in synchronization with the ejector mechanism 190, regulates the moving direction of the sliding piece 50 in a direction (X direction) in which the molding core 80 connected to the sliding piece 50 is disengaged from the undercut portion P1. Here, the direction in which the molding core 80 is disengaged from the undercut portion P1 is the direction in which the molding core 80 is disengaged from the undercut portion P1 without deforming or damaging the undercut portion P1.
　ホルダー２０の斜溝２８は、成形品Ｐのアンダーカット部Ｐ１の形状、特に、アンダーカット部Ｐ１のＸ方向への突出量と、突き出しピン２００のストロークとに応じて、成形品Ｐの突き出し時に成形コア８０が成形品Ｐのアンダーカット部Ｐ１から外れるように決められる。 The inclined groove 28 of the holder 20 corresponds to the shape of the undercut portion P1 of the molded product P, in particular, the amount of protrusion of the undercut portion P1 in the X direction and the stroke of the protruding pin 200 when the molded product P is ejected. It is determined that the molding core 80 is removed from the undercut portion P1 of the molded product P.
　ホルダー２０の形状は、特定の形状に限定されるものではなく、成形コア８０が成形品Ｐの成形時にアンダーカット部Ｐ１を成形し、成形品Ｐの突き出し時に成形コア８０がアンダーカット部Ｐ１から外れるように摺動駒５０及び保持駒３０の移動方向を規制可能であればよい。さらにホルダー２０は、本実施形態のアンダーカット処理機構１１のように摺動駒５０の位置・姿勢及び保持駒３０の姿勢を保持可能な機能を備えるものが好ましい。 The shape of the holder 20 is not limited to a particular shape, and the molding core 80 molds the undercut portion P1 when molding the molded product P, and the molding core 80 moves from the undercut portion P1 when the molded product P is ejected. It suffices if the moving directions of the sliding piece 50 and the holding piece 30 can be regulated so as to come off. Further, the holder 20 preferably has a function of holding the position/posture of the sliding piece 50 and the posture of the holding piece 30 like the undercut processing mechanism 11 of the present embodiment.
　保持駒３０は、略直方体の本体３１を有し、本体３１の上面３２に凸条４０が設けられてなる。図２において、本体３１の正面側の壁面３３の左端及び背面側の壁面の左端には、ホルダー２０に設けられた縦溝２７に摺動自在に嵌り込む凸条３８が設けられている。本体３１の幅（Ｘ方向）は、ホルダー２０の内部空間の幅（Ｘ方向）よりも小さい（図３参照）。本体３１の上面３２と側面３６とが交差する角部Ｃ１には、摺動駒５０との噛みつきを防止するための面取りが施されている。 The holding piece 30 has a substantially rectangular parallelepiped main body 31, and a ridge 40 is provided on an upper surface 32 of the main body 31. In FIG. 2, at the left end of the wall surface 33 on the front side of the main body 31 and the left end of the wall surface on the back side, there are provided ridges 38 slidably fitted into the vertical grooves 27 provided in the holder 20. The width (X direction) of the main body 31 is smaller than the width (X direction) of the internal space of the holder 20 (see FIG. 3 ). A corner C1 where the upper surface 32 and the side surface 36 of the main body 31 intersect each other is chamfered to prevent the sliding piece 50 from being caught.
　凸条４０は、Ｘ方向に伸びる、摺動駒５０に設けられた爪６０が摺動自在に係止する部材である。凸条４０の長さは、ホルダー２０の内部空間の幅と同一であり、保持駒３０がホルダー２０に組み込まれた状態で、凸条４０の一端はホルダー２０の内壁面２４に、凸条４０の他端４４は、ホルダー２０の内壁面２５にそれぞれ摺動自在に接する。凸条４０の長さは、本体３１の幅に比較して長いので、凸条の一部は、本体３１から突出した突出部４５となっている（図３参照）。 The ridge 40 is a member extending in the X direction and slidably retained by the claw 60 provided on the sliding piece 50. The length of the ridge 40 is the same as the width of the inner space of the holder 20, and one end of the ridge 40 is attached to the inner wall surface 24 of the holder 20 while the holding piece 30 is assembled in the holder 20. The other end 44 of each of them slidably contacts the inner wall surface 25 of the holder 20. Since the length of the ridge 40 is longer than the width of the main body 31, a part of the ridge is a protruding portion 45 protruding from the main body 31 (see FIG. 3 ).
　凸条４０の横断面は、下部４１に比較して上部４２が幅広でありＴ字形状を有する。凸条４０の下部の幅（Ｚ方向）は、本体３１の上面３２の厚さ（Ｚ方向）に比較して小さいため本体３１と凸条４０との間に蟻溝４６が形成される。この蟻溝４６に摺動駒５０に設けられた爪６０が摺動自在に係止する。 As for the cross section of the ridge 40, the upper portion 42 is wider than the lower portion 41 and has a T-shape. Since the width of the lower portion of the ridge 40 (Z direction) is smaller than the thickness of the upper surface 32 of the main body 31 (Z direction), a dovetail groove 46 is formed between the main body 31 and the ridge 40. The claw 60 provided on the sliding piece 50 is slidably locked in the dovetail groove 46.
　保持駒３０は、底面３７にエジェクタ台板１９１に固定された突き出しピン２００が連結し、ホルダー２０内に収容される。保持駒３０は、凸条３８をホルダー２０の縦溝２７に摺動自在に嵌め入れ、突き出しピン２００に突き出され型抜き方向（Ｙ方向）に進退する。 The holding piece 30 is accommodated in the holder 20 by connecting the ejection pin 200 fixed to the ejector base plate 191 to the bottom surface 37. In the holding piece 30, the ridge 38 is slidably fitted in the vertical groove 27 of the holder 20, and is projected by the ejection pin 200 to advance and retreat in the die cutting direction (Y direction).
　摺動駒５０は、横断面が略矩形で直線状の棒部材からなる本体５１を有し、本体５１の上面５２には成形コア８０を取付けるための取付部６８が設けられている。本体５１の横断面は、矩形に限定されるものではなく、後述の凸条５９、爪６０、開口部６２さらには当接面５８、７２を設けることができれば他の形状であってもよい。 The sliding piece 50 has a main body 51 made of a linear rod member having a substantially rectangular cross section, and an attachment portion 68 for attaching the molding core 80 is provided on the upper surface 52 of the main body 51. The cross section of the main body 51 is not limited to the rectangular shape, and may have any other shape as long as the projection 59, the claw 60, the opening 62, and the contact surfaces 58 and 72 described below can be provided.
　本体５１は、上面５２と底面５３とが平行であり、上面５２を水平にしたときＸ軸Ｙ軸を含む平面に平行な側面５４、５５は傾斜している（図２参照）。また側面５４に直交する面である傾斜面５６、５７のうち、傾斜面５６の下部には当接面５８が設けられている。当接面５８は、後述のストッパ７０に設けられた当接面７２とで第１の位置姿勢保持手段を構成する。 The main body 51 has a top surface 52 and a bottom surface 53 parallel to each other, and when the top surface 52 is horizontal, side surfaces 54 and 55 parallel to a plane including the X axis and the Y axis are inclined (see FIG. 2). Further, a contact surface 58 is provided below the inclined surface 56 among the inclined surfaces 56 and 57 which are surfaces orthogonal to the side surface 54. The contact surface 58 constitutes a first position/orientation holding unit together with a contact surface 72 provided on a stopper 70 described later.
　当接面５８は、Ｙ軸Ｚ軸を含む平面に平行な面であり（図２参照）、摺動駒５０及び保持駒３０がホルダー２０に組み込まれた状態で、保持駒３０の側面３６に平行である。当接面５８は、保持駒３０と摺動駒５０との連結が解かれ、保持駒３０が上昇すると保持駒３０の側面３６に当接し、摺動駒５０の位置・姿勢を保持するように機能する（図４（Ｃ）参照）。本実施形態において保持駒３０と摺動駒５０との連結が解かれるとは、摺動駒５０が移動し、図４（Ｂ）、図４（Ｃ）に示すように摺動駒５０の爪６０が蟻溝４６から完全に外れた状態をいう。当接面５８と底面５３とが交差する角部Ｃ２には、保持駒３０との噛みつきを防止するための面取りが施されている。 The contact surface 58 is a surface parallel to a plane including the Y axis and the Z axis (see FIG. 2), and is attached to the side surface 36 of the holding piece 30 in a state where the sliding piece 50 and the holding piece 30 are incorporated in the holder 20. Parallel. The contact surface 58 contacts the side surface 36 of the holding piece 30 when the connection between the holding piece 30 and the sliding piece 50 is released and the holding piece 30 rises, so that the position/posture of the sliding piece 50 is maintained. It functions (see FIG. 4C). In the present embodiment, when the connection between the holding piece 30 and the sliding piece 50 is released, the sliding piece 50 moves and the claws of the sliding piece 50 are moved as shown in FIGS. 4(B) and 4(C). The state where 60 is completely disengaged from the dovetail groove 46. A corner portion C2 where the contact surface 58 and the bottom surface 53 intersect each other is chamfered to prevent biting with the holding piece 30.
　本実施形態において摺動駒５０の爪６０が蟻溝４６に嵌り込んでいるときは、摺動駒５０は、保持駒３０と摺動自在に連結された状態にあり、保持駒３０と一体的に移動する。一方、摺動駒５０の爪６０が蟻溝４６から完全に外れ、爪６０が凸条４０の突出部４５に位置するときには、摺動駒５０と保持駒３０とは離脱状態にあり、保持駒３０が上昇しても摺動駒５０は上昇しない。 In the present embodiment, when the claw 60 of the sliding piece 50 is fitted in the dovetail groove 46, the sliding piece 50 is in a state of being slidably connected to the holding piece 30 and integrated with the holding piece 30. Move to. On the other hand, when the claw 60 of the sliding piece 50 is completely disengaged from the dovetail groove 46 and the claw 60 is located at the projecting portion 45 of the ridge 40, the sliding piece 50 and the holding piece 30 are in the disengaged state, and the holding piece Even if 30 rises, the sliding piece 50 does not rise.
　また本体５１の側面５４及び側面５５はそれぞれ、傾斜面５７側に凸条５９を備える。この凸条５９は、ホルダー２０に設けられた斜溝２８に摺動自在に嵌り込む。 Further, each of the side surface 54 and the side surface 55 of the main body 51 is provided with a ridge 59 on the inclined surface 57 side. The ridge 59 is slidably fitted in the slant groove 28 provided in the holder 20.
　摺動駒５０の下端には、図２の前後方向（Ｚ方向）に間隔をあけて一対の爪６０が設けられている。一対の爪６０は、傾斜面５６の下部に底面５３及び当接面５８に繋がる開口部６２を設けることで形成されている。開口部６２は、底面５３に繋がる第１開口部６３と第１開口部６３の上に位置し第１開口部６３に繋がる第２開口部６４とからなる。第１開口部６３の幅（Ｚ方向）に比較して第２開口部６４の幅（Ｚ方向）を広くし、第１開口部６３と第２開口部６４との境界に段差を設け、一対の爪６０が形成されている。 A pair of claws 60 are provided at the lower end of the sliding piece 50 at intervals in the front-back direction (Z direction) of FIG. The pair of claws 60 are formed by providing an opening 62 connected to the bottom surface 53 and the contact surface 58 at the lower part of the inclined surface 56. The opening 62 includes a first opening 63 connected to the bottom surface 53 and a second opening 64 located above the first opening 63 and connected to the first opening 63. The width (Z direction) of the second opening 64 is made wider than the width of the first opening 63 (Z direction), and a step is provided at the boundary between the first opening 63 and the second opening 64. Claws 60 are formed.
　第１開口部６３の高さ（Ｙ方向）が爪６０の高さとなり、この高さは、保持駒３０に設けられた蟻溝４６に摺動自在に嵌り込む高さとなっている。また第１開口部６３の幅（Ｚ方向）が一対の爪６０の間隔（隙間）となり、この幅は、保持駒３０に設けられた凸条４０の下部４１の幅（Ｚ方向）と略同一であり、一対の爪６０が前後の蟻溝４６に摺動自在に嵌り込む。一対の爪６０の間隔は、保持駒３０の上面３２の幅（Ｚ方向）及び第２開口部６４の幅（Ｚ方向）よりも狭くなっている。 The height of the first opening 63 (Y direction) is the height of the claw 60, and this height is the height that is slidably fitted into the dovetail groove 46 provided in the holding piece 30. Further, the width (Z direction) of the first opening portion 63 becomes the interval (gap) between the pair of claws 60, and this width is substantially the same as the width (Z direction) of the lower portion 41 of the ridge 40 provided on the holding piece 30. The pair of claws 60 are slidably fitted into the front and rear dovetail grooves 46. The distance between the pair of claws 60 is smaller than the width of the upper surface 32 of the holding piece 30 (Z direction) and the width of the second opening 64 (Z direction).
　第２開口部６４は、図２において左側（－Ｘ方向）が当接面５８に、また右側の下端が第１開口部６３の右端（傾斜面５７側）に、上面が傾斜面５６に繋がるように設けられている。第２開口部６４の幅（Ｚ方向）は、凸条４０の上部４２の幅（Ｚ方向）よりも大きく設定され、凸条４０は、第２開口部６４を通過することができる。第２開口部６４は、凸条４０の突出部４５が摺動駒５０に衝突することを防ぐ回避溝ということができる。 In the second opening 64, the left side (−X direction) in FIG. 2 is connected to the contact surface 58, the lower end on the right side is connected to the right end (the inclined surface 57 side) of the first opening 63, and the upper surface is connected to the inclined surface 56. Is provided. The width (Z direction) of the second opening 64 is set larger than the width (Z direction) of the upper portion 42 of the ridge 40, and the ridge 40 can pass through the second opening 64. The second opening 64 can be referred to as an avoidance groove that prevents the protrusion 45 of the ridge 40 from colliding with the sliding piece 50.
　一対の爪６０の形態は、上記実施形態に限定されるものではない。爪６０は、保持駒３０の蟻溝４６に摺動自在に嵌り込み、爪６０が凸条４０の突出部４５に移動すると、保持駒３０は上方に移動可能でかつ下方に移動不能であればよい。例えば図２において爪６０の一部が－Ｘ方向に突出していてもよく、また第２開口部６４の幅（Ｚ方向）が、傾斜面５６の幅（Ｚ方向）と同じであってもよい。 The form of the pair of claws 60 is not limited to the above embodiment. The pawl 60 is slidably fitted into the dovetail groove 46 of the holding piece 30, and when the pawl 60 moves to the projecting portion 45 of the convex strip 40, if the holding piece 30 can move upward and cannot move downward. Good. For example, in FIG. 2, part of the claw 60 may protrude in the −X direction, and the width of the second opening 64 (Z direction) may be the same as the width of the inclined surface 56 (Z direction). ..
　摺動駒５０は、下端の爪６０を保持駒３０の蟻溝４６に嵌め入れ、ホルダー２０の斜溝２８に凸条５９を嵌め込んだ状態でホルダー２０内に収容され、保持駒３０のＹ方向への移動に連動してホルダー２０の斜溝２８に沿って移動する。 The sliding piece 50 is housed in the holder 20 with the lower end claw 60 fitted in the dovetail groove 46 of the holding piece 30 and the convex strip 59 fitted in the slant groove 28 of the holder 20, and the sliding piece 50 has a Y-shape. It moves along the oblique groove 28 of the holder 20 in conjunction with the movement in the direction.
　また摺動駒５０の傾斜面５７の下端には、ストッパ７０が設けられている。ストッパ７０は、当接面７２を有する（図４参照）。当接面７２は、Ｙ軸Ｚ軸を含む平面に平行な面であり、摺動駒５０及び保持駒３０がホルダー２０に組み込まれた状態で、ホルダー２０の内壁面２５に平行である。当接面７２は、摺動駒５０が移動し保持駒３０との連結が解かれたとき及びその後にホルダー２０の内壁面２５に当接し、摺動駒５０の位置・姿勢を保持する（図４（Ｂ）参照）。また保持駒３０と摺動駒５０との連結が解かれ、保持駒３０が上昇すると、当接面７２は、摺動駒５０の下部を当接面５８とで挟み込み摺動駒５０の位置・姿勢を保持する。 A stopper 70 is provided at the lower end of the inclined surface 57 of the sliding piece 50. The stopper 70 has a contact surface 72 (see FIG. 4). The contact surface 72 is a surface parallel to a plane including the Y axis and the Z axis, and is parallel to the inner wall surface 25 of the holder 20 when the sliding piece 50 and the holding piece 30 are incorporated in the holder 20. The contact surface 72 contacts the inner wall surface 25 of the holder 20 when the sliding piece 50 moves and is disconnected from the holding piece 30, and thereafter holds the position and posture of the sliding piece 50 (FIG. 4 (B)). Further, when the connection between the holding piece 30 and the sliding piece 50 is released and the holding piece 30 rises, the contact surface 72 sandwiches the lower part of the sliding piece 50 with the contact surface 58 and the position of the sliding piece 50. Hold the posture.
　成形コア８０は、アンダーカット部Ｐ１を含む成形品Ｐの一部に沿った形状のブロック部材であり、摺動駒５０の取付部６８に固定されている。成形コア８０の形状は、成形品Ｐの形状に応じて決められる。なお成形コア８０は、摺動駒５０に一体的に形成されていてもよい。 The molding core 80 is a block member having a shape along a part of the molded product P including the undercut portion P1, and is fixed to the mounting portion 68 of the sliding piece 50. The shape of the molding core 80 is determined according to the shape of the molded product P. The molding core 80 may be formed integrally with the sliding piece 50.
　さらに本実施形態のアンダーカット処理機構１１には、ホルダー２０に装着されたボールプランジャ９０とボールプラジャ９０のボール９１が嵌り込む凹部６５とで構成される第２の位置姿勢保持手段を備える。第２の位置姿勢保持手段は、保持駒３０と摺動駒５０との連結が解かれたとき及びその後、摺動駒５０の位置・姿勢を保持する部材である。 Further, the undercut processing mechanism 11 of the present embodiment is provided with a second position/orientation holding means composed of a ball plunger 90 mounted on the holder 20 and a recess 65 into which the ball 91 of the ball plunger 90 is fitted. The second position/orientation holding means is a member that holds the position/orientation of the sliding piece 50 when and after the connection between the holding piece 30 and the sliding piece 50 is released.
　ボールプランジャ９０は、傾斜面２６にボール９１が傾斜面２６から突出するように装着されている。凹部６５は、摺動駒５０の本体５１の傾斜面５７であって、摺動駒５０が移動し、保持駒３０との連結が解かれたときボールプランジャ９０のボール９１が嵌り込む位置に設けられている（図４（Ｂ）参照）。 The ball plunger 90 is mounted on the inclined surface 26 so that the ball 91 projects from the inclined surface 26. The recessed portion 65 is the inclined surface 57 of the main body 51 of the sliding piece 50, and is provided at a position where the ball 91 of the ball plunger 90 fits when the sliding piece 50 moves and the connection with the holding piece 30 is released. (See FIG. 4B).
　ここで使用するボールプランジャ９０は、有底筒状の本体、本体の先端から抜けないように本体内に配置されたボール９１、本体内に配置されボール９１を先端方向に付勢する圧縮コイルバネで構成される公知のボールプランジャであり、ボール９１が凹部６５に嵌ることで摺動駒５０の位置・姿勢を保持する。 The ball plunger 90 used here is a bottomed cylindrical main body, a ball 91 arranged in the main body so as not to come off from the tip of the main body, and a compression coil spring arranged in the main body for urging the ball 91 in the front end direction. This is a well-known ball plunger configured and holds the position/posture of the sliding piece 50 by fitting the ball 91 into the recess 65.
　本実施形態では、ボールプランジャ９０をホルダー２０の傾斜面２６に取付けているが、ボールプランジャ９０の取付け位置は、特に限定されるものではない。保持駒３０の側面３６にボールプランジャ９０を取付け、ボール９１を摺動駒５０の当接面５８に係止させるようにしてもよい。ボールプランジャ９０の装着個数も１個に限定されるものではなく、２個以上取付けてもよい。 In this embodiment, the ball plunger 90 is mounted on the inclined surface 26 of the holder 20, but the mounting position of the ball plunger 90 is not particularly limited. A ball plunger 90 may be attached to the side surface 36 of the holding piece 30 and the ball 91 may be locked to the contact surface 58 of the sliding piece 50. The number of ball plungers 90 mounted is not limited to one, but two or more may be mounted.
　本実施形態では、位置姿勢保持手段を構成する、摺動駒５０をホルダー２０に係止させる係止手段にボールプランジャ９０を使用するが、ボールプランジャ９０に代えて、凹部６５に着脱自在に嵌り込む板ばね、凹部６５に着脱自在に嵌り込む凸部を有する弾性体を用いてもよい。 In the present embodiment, the ball plunger 90 is used as the locking means that locks the sliding piece 50 with the holder 20, which constitutes the position/orientation holding means. Instead of the ball plunger 90, the ball plunger 90 is detachably fitted into the recess 65. An elastic body having a leaf spring to be inserted and a convex portion to be detachably fitted in the concave portion 65 may be used.
　要すれば第２の位置姿勢保持手段は、摺動駒５０、ホルダー２０、保持駒３０のうち１以上に設けられ、保持駒３０と摺動駒５０との連結が解かれたとき及びその後に摺動駒５０をホルダー２０、又は保持駒３０、又はホルダー２０と保持駒３０とに着脱自在に係止させ、保持駒３０との連結が解かれた摺動駒５０の位置・姿勢を保持することができればよい。 If necessary, the second position/orientation holding means is provided on one or more of the sliding piece 50, the holder 20, and the holding piece 30, and when the holding piece 30 and the sliding piece 50 are released from each other and thereafter. The sliding piece 50 is detachably locked to the holder 20, the holding piece 30, or the holder 20 and the holding piece 30 to hold the position/posture of the sliding piece 50 after the connection with the holding piece 30 is released. I wish I could.
　本実施形態のアンダーカット処理機構１１は、摺動駒５０の下部を前後から挟むことが可能な２つの当接面５８、７２で構成される第１の位置姿勢保持手段を備えるため第２の位置姿勢保持手段を省略することも可能である。一方で、第１の位置姿勢保持手段と異なる構造の第２の位置姿勢保持手段を設けることで、保持駒３０との連結が解かれた摺動駒５０の位置・姿勢をより確実に保持することができる。 Since the undercut processing mechanism 11 of the present embodiment includes the first position/orientation holding means configured by the two contact surfaces 58 and 72 capable of sandwiching the lower portion of the sliding piece 50 from the front and the back, it is the second It is also possible to omit the position and orientation holding means. On the other hand, by providing the second position/orientation holding means having a structure different from that of the first position/orientation holding means, the position/orientation of the sliding piece 50, which is disconnected from the holding piece 30, is held more reliably. be able to.
　次に、成形用金型１において成形品Ｐを射出成形によって成形する場合を例として、本実施形態の成形用金型１の動作、作用を説明する。成形品Ｐの成形時には、摺動駒５０が可動側型板１６１に内設されたホルダー２０内に収容され、成形コア８０が成形品Ｐのアンダーカット部Ｐ１を成形するように位置する（図１、図４（Ａ）参照）。 Next, the operation and action of the molding die 1 of the present embodiment will be described by taking the case where the molded product P is molded by injection molding in the molding die 1 as an example. During molding of the molded product P, the sliding piece 50 is housed in the holder 20 provided inside the movable mold plate 161, and the molding core 80 is positioned so as to mold the undercut portion P1 of the molded product P (see FIG. 1, FIG. 4(A)).
　成形用金型１は、固定型１０１と可動型１５１とのパーティング面（ＰＬ面）が合わされ、溶融材料が射出され成形品Ｐの成形が行われる。溶融材料の射出、冷却の各工程が終了すると、型開きが行われ、成形品Ｐの取り出し工程に移行する。取り出し工程における成形用金型１の動作は次の通りである。 In the molding die 1, the parting surfaces (PL surfaces) of the fixed mold 101 and the movable mold 151 are matched, and the molten material is injected to mold the molded product P. When each process of injecting the molten material and cooling is completed, the mold is opened and the process of taking out the molded product P is started. The operation of the molding die 1 in the take-out step is as follows.
　型開き後、図示を省略した突き出し装置を介してエジェクタロッド１９８が押し出され、エジェクタ台板１９１が上方（Ｙ方向）に移動する（図５参照）。これに伴いエジェクタ台板１９１上に立設したエジェクタピン１９２が成形品ＰをＹ方向に突き出す。 After the mold is opened, the ejector rod 198 is pushed out through the ejecting device (not shown), and the ejector base plate 191 moves upward (Y direction) (see FIG. 5). Along with this, the ejector pins 192 erected on the ejector base plate 191 project the molded product P in the Y direction.
　同時にホルダー２０内に収容された保持駒３０が突き出しピン２００に突き出されエジェクタピン１９２と同量Ｙ方向へ移動する。保持駒３０のＹ方向への移動に伴って、保持駒３０の蟻溝４６に爪６０を係止させる摺動駒５０は、図１に示す成形位置からホルダー２０にある斜溝２８に沿って移動する。これにより成形コア８０は、Ｙ方向及びＸ方向へ同時に移動しアンダーカット部Ｐ１から遠ざかる（図５参照）。 At the same time, the holding piece 30 housed in the holder 20 is ejected by the ejection pin 200 and moved in the Y direction by the same amount as the ejector pin 192. As the holding piece 30 moves in the Y direction, the sliding piece 50 that holds the claw 60 in the dovetail groove 46 of the holding piece 30 extends from the molding position shown in FIG. 1 along the oblique groove 28 in the holder 20. Moving. As a result, the molding core 80 simultaneously moves in the Y direction and the X direction and moves away from the undercut portion P1 (see FIG. 5).
　エジェクタ台板１９１が上昇し地点Ｈ１（図示省略）に達すると、成形コア８０がアンダーカット部Ｐ１から完全に外れる。この時点で、成形品Ｐは固定型１５１に対して取り出し可能な位置まで達していない。このためエジェクタ台板１９１は、引き続き上昇し、エジェクタピン１９２は、成形品Ｐの内側に接した状態で引き続き成形品Ｐを突き出す。同時に保持駒３０及び摺動駒５０もエジェクタ台板１９１の上昇に伴い上昇する。 When the ejector base plate 191 rises and reaches the point H1 (not shown), the molding core 80 is completely removed from the undercut portion P1. At this point, the molded product P has not reached the position where it can be taken out from the fixed mold 151. Therefore, the ejector base plate 191 continues to rise, and the ejector pin 192 continues to protrude the molded product P while being in contact with the inside of the molded product P. At the same time, the holding piece 30 and the sliding piece 50 also rise as the ejector base plate 191 rises.
　エジェクタ台板１９１が上昇し地点Ｈ２に達すると、摺動駒５０は、爪６０が保持駒３０の凸条４０の突出部４５に位置する。この位置では、摺動駒５０の爪６０は、保持駒３０の蟻溝４６から外れているので摺動駒５０と保持駒３０との連結が解かれる。この位置は、成形コア８０が成形品Ｐの突起部Ｐ２に衝突するよりも前の位置である（図４（Ｂ）、図５参照）。 When the ejector base plate 191 ascends and reaches the point H2, the claw 60 of the sliding piece 50 is located at the protruding portion 45 of the ridge 40 of the holding piece 30. At this position, the claw 60 of the sliding piece 50 is disengaged from the dovetail groove 46 of the holding piece 30, so the connection between the sliding piece 50 and the holding piece 30 is released. This position is a position before the molding core 80 collides with the protrusion P2 of the molded product P (see FIG. 4(B) and FIG. 5).
　エジェクタ台板１９１が地点Ｈ２に達すると、同時に摺動駒５０のストッパ７０の当接面７２が、ホルダー２０の内壁面２５に当接する。さらにボールプランジャ９０のボール９１が、摺動駒５０の凹部６５に嵌り込む（図４（Ｂ）、図５参照）。これにより摺動駒５０と保持駒３０の連結が解かれるものの、当接面７２の内壁面２５への当接、及びボールプランジャ９０による摺動駒５０とホルダー２０との連結により、摺動駒５０の位置・姿勢が保持される。なおこの時点で摺動駒５０の当接面５８は、保持駒３０の側面３６に接していない。 When the ejector base plate 191 reaches the point H2, the contact surface 72 of the stopper 70 of the sliding piece 50 simultaneously contacts the inner wall surface 25 of the holder 20. Further, the ball 91 of the ball plunger 90 fits into the concave portion 65 of the sliding piece 50 (see FIG. 4(B) and FIG. 5). Although the connection between the sliding piece 50 and the holding piece 30 is released by this, the sliding piece 50 is brought into contact with the inner wall surface 25 by the contact and the ball plunger 90 connects the sliding piece 50 and the holder 20. 50 positions/postures are retained. At this point, the contact surface 58 of the sliding piece 50 is not in contact with the side surface 36 of the holding piece 30.
　さらにエジェクタ台板１９１は上昇し、エジェクタピン１９２は、成形品Ｐの内側に接した状態で引き続き成形品Ｐを突き出す。また保持駒３０は、突出部４５が摺動駒５０の第２開口部６４を通過できるのでエジェクタ台板１９１と一体的に上昇する。一方、摺動駒５０は、エジェクタ台板１９１が地点Ｈ２に達した時点で、保持駒３０との連結が解かれているのでこれ以上上昇できず、保持駒３０がさらに上昇しても成形コア８０が成形品Ｐの突起部Ｐ２に衝突することはない。 Further, the ejector base plate 191 rises, and the ejector pin 192 continues to eject the molded product P while being in contact with the inside of the molded product P. Further, the holding piece 30 ascends integrally with the ejector base plate 191 because the protrusion 45 can pass through the second opening 64 of the sliding piece 50. On the other hand, when the ejector base plate 191 reaches the point H2, the sliding piece 50 cannot be further raised because it is no longer connected to the holding piece 30, and even if the holding piece 30 is further raised, 80 does not collide with the projection P2 of the molded product P.
　保持駒３０は、エジェクタ台板１９１が地点Ｈ２を超えてさらに上昇する過程で、保持駒３０の側面３６が摺動駒５０の当接面５８に接し、以降互いの面を摺動させた状態で保持駒３０は上昇する。このとき摺動駒５０は、当接面７２がホルダー２０の内壁面２５に当接し、さらにボールプランジャ９０のボール９１が、摺動駒５０の凹部６５に嵌り込んでいるので摺動５０の位置・姿勢をより確実に保持することができる。 The holding piece 30 is in a state in which the side surface 36 of the holding piece 30 is in contact with the contact surface 58 of the sliding piece 50 in the process in which the ejector base plate 191 further rises beyond the point H2, and thereafter the surfaces are slid with each other. The holding piece 30 moves up. At this time, since the contact surface 72 of the sliding piece 50 contacts the inner wall surface 25 of the holder 20, and the ball 91 of the ball plunger 90 is fitted in the recess 65 of the sliding piece 50, the position of the sliding piece 50 is changed. -The posture can be held more reliably.
　保持駒３０の側面３６と摺動駒５０の当接面５８との接し始めにおいて、互いの角部Ｃ１、Ｃ２の噛みつきが懸念されるが、本実施形態のアンダーカット処理機構においては、角部Ｃ１、Ｃ２に噛みつき防止用の面取りがされているので、保持駒３０の側面３６が摺動駒５０の当接面５８にスムーズに接し、摺動する。 At the beginning of contact between the side surface 36 of the holding piece 30 and the contact surface 58 of the sliding piece 50, there is a concern that the corner portions C1 and C2 may bite each other. However, in the undercut processing mechanism of this embodiment, the corner portion Since C1 and C2 are chamfered to prevent biting, the side surface 36 of the holding piece 30 smoothly comes into contact with the contact surface 58 of the sliding piece 50 and slides.
　エジェクタ台板１９１が地点Ｈ３に達した時点で、成形品が取出し可能に突き出され突き出し操作が完了する（図６、図７参照）。 When the ejector base plate 191 reaches the point H3, the molded product is ejected so that it can be ejected, and the ejection operation is completed (see FIGS. 6 and 7).
　成形品Ｐの取り出し後、次の成形品Ｐを成形すべく、再度、成形用金型１の型締めが行われる。型締め時には、可動型１５１全体が固定型１０１に近づくように移動するとともに、エジェクタ台板１９１が可動側型板１６１から遠ざかるように移動する。アンダーカット処理機構１１は、エジェクタ台板１９１の移動に連動して、保持駒５０が先とは逆向きに移動する。 After taking out the molded product P, the mold die 1 is clamped again to mold the next molded product P. During mold clamping, the entire movable die 151 moves toward the fixed die 101, and the ejector base plate 191 moves away from the movable side die plate 161. In the undercut processing mechanism 11, the holding piece 50 moves in the opposite direction to the tip in conjunction with the movement of the ejector base plate 191.
　エジェクタ台板１９１が降下し地点Ｈ２に達すると、保持駒３０の凸条４０の突出部４５が、保持駒５０の爪６０に接する。突出部４５は、上部４２の幅が一対の爪６０の間隔よりも広いためエジュクタ台板１９１がさらに降下すると、突起部４５が爪６０に係止し、摺動駒５０は、突起部４５により押し下げられる。これにより爪６０が蟻溝４６に入り込み、摺動駒５０は、さらに斜溝２８に沿って下降し、最終的に成形コア８０の上面８１が可動側型板１６１上面と面一になる（図９参照）。 When the ejector base plate 191 descends and reaches the point H2, the projecting portion 45 of the projection 40 of the holding piece 30 contacts the claw 60 of the holding piece 50. Since the width of the upper portion 42 of the protrusion 45 is wider than the distance between the pair of claws 60, when the ejector base plate 191 further descends, the protrusion 45 is locked to the claw 60, and the sliding piece 50 is moved by the protrusion 45. Pushed down. As a result, the claw 60 enters the dovetail groove 46, the sliding piece 50 further descends along the oblique groove 28, and the upper surface 81 of the molding core 80 finally becomes flush with the upper surface of the movable side mold plate 161 (see FIG. 9).
　型締めが完了すると、成形材料が射出され次の成形品Ｐが成形される。成形用金型１の型開き状態から型締めへの基本動作は、従来のアンダーカット処理機構を備える成形用金型と同じである。 When the mold clamping is completed, the molding material is injected and the next molded product P is molded. The basic operation of the molding die 1 from the opened state to the mold clamping is the same as that of the conventional molding die having the undercut processing mechanism.
　以上のように、第１実施形態の成形用金型１、アンダーカット処理機構１１によれば、エジェクタ機構１９０の動きに連動して保持駒３０がホルダー２０内を摺動しながら上昇し、摺動駒５０がホルダー２０にガイドされ成形コア８０がアンダーカット部Ｐ１から外れるように移動するので、コンパクトかつ簡素に構成可能でありながら容易にまた確実にアンダーカット部Ｐ１を抜くことができる。 As described above, according to the molding die 1 and the undercut processing mechanism 11 of the first embodiment, the holding piece 30 moves upward while sliding in the holder 20 in association with the movement of the ejector mechanism 190. Since the moving piece 50 is guided by the holder 20 and the molding core 80 moves so as to be separated from the undercut portion P1, the undercut portion P1 can be easily and reliably pulled out while having a compact and simple structure.
　さらに第１実施形態の成形用金型１、アンダーカット処理機構１１は、摺動駒５０が規定された位置まで移動すると、保持駒３０と摺動駒５０との連結を解く離脱機構を備えるので、規定された位置をアンダーカット部Ｐ１が外れる位置とすれば、アンダーカット部Ｐ１が外れるように成形コア８０を移動させた後に、摺動駒５０と保持駒３０とを切り離すことができる。よってアンダーカット部Ｐ１を外した先に突出部Ｐ２を有するような成形品Ｐであっても、一段の突き出し操作で容易にまた確実に型抜きすることができる。また摺動駒５０と保持駒３０とを切り離すことでエジェクタ機構１９０の突き上げ量を大きく設定することができる。 Furthermore, since the molding die 1 and the undercut processing mechanism 11 of the first embodiment are provided with a detaching mechanism that releases the connection between the holding piece 30 and the sliding piece 50 when the sliding piece 50 moves to the specified position. If the defined position is set to the position where the undercut portion P1 comes off, the sliding piece 50 and the holding piece 30 can be separated after moving the molding core 80 so that the undercut portion P1 comes off. Therefore, even a molded product P having the protruding portion P2 at the tip of which the undercut portion P1 has been removed can be easily and reliably die-cut by a single-stage protruding operation. Further, by separating the sliding piece 50 and the holding piece 30, the thrust amount of the ejector mechanism 190 can be set large.
　アンダーカット処理機構１１において、摺動駒５０と保持駒３０との連結が解かれると摺動駒５０、保持駒３０それぞれの位置・姿勢の保持が問題となる。摺動駒５０は、保持駒３０との連結が解かれると基本的にはフリーとなるので、摺動駒５０が落下するようなケースもあり得る。また保持駒３０は、摺動駒５０との連結が解かれると、拘束される箇所が減るため姿勢の保持が難しくなる。これに対して第１実施形態の成形用金型１、アンダーカット処理機構１１では、摺動駒５０の位置・姿勢保持手段、さらに保持駒３０の姿勢保持手段を備えるので、摺動駒５０、保持駒３０それぞれの位置・姿勢を拘束し、位置・姿勢を確実に保持することができる。 In the undercut processing mechanism 11, when the connection between the sliding piece 50 and the holding piece 30 is released, it becomes a problem to maintain the position and orientation of the sliding piece 50 and the holding piece 30. Since the sliding piece 50 basically becomes free when the connection with the holding piece 30 is released, there may be a case where the sliding piece 50 falls. Further, when the holding piece 30 is released from the connection with the sliding piece 50, the number of restrained portions is reduced, so that it becomes difficult to hold the posture. On the other hand, in the molding die 1 and the undercut processing mechanism 11 of the first embodiment, since the position/posture holding means of the sliding piece 50 and the posture holding means of the holding piece 30 are provided, the sliding piece 50, The position/orientation of each of the holding pieces 30 can be restricted, and the position/orientation can be reliably held.
　また第１実施形態のアンダーカット処理機構１１は、摺動駒５０及び保持駒３０をホルダー２０内に収納した状態で成形用金型１に組込むことができるので、コンパクトに構成可能であるとともに、成形用金型１への取付けが容易である。特にホルダー２０、保持駒３０、摺動駒５０及び成形コア８０を１つのユニットとすれば、成形用金型１への取付けがより容易となる。 Further, since the undercut processing mechanism 11 of the first embodiment can be assembled in the molding die 1 with the sliding piece 50 and the holding piece 30 housed in the holder 20, it can be configured compactly, and It can be easily attached to the molding die 1. In particular, if the holder 20, the holding piece 30, the sliding piece 50, and the molding core 80 are combined into one unit, the attachment to the molding die 1 becomes easier.
　以上、第１実施形態の成形用金型１を用いて、本発明のアンダーカット処理機構、成形用金型及び成形品を説明したが、本発明のアンダーカット処理機構、成形用金型及び成形品は、上記実施形態に限定されるものではなく、要旨を変更しない範囲で変形して使用することができる。上記実施形態では、成形コア８０がアンダーカットＰ１から外れる位置Ｈ１と、摺動駒５０と保持駒３０との連結が解かれる位置Ｈ２とを異ならせているが、この位置が同じであってもよい。 The undercut processing mechanism, the molding die and the molded product of the present invention have been described above by using the molding die 1 of the first embodiment. However, the undercut processing mechanism, the molding die and the molding of the present invention have been described. The product is not limited to the above-mentioned embodiment, and can be modified and used without changing the gist. In the above-described embodiment, the position H1 at which the molding core 80 is disengaged from the undercut P1 and the position H2 at which the connection between the sliding piece 50 and the holding piece 30 is released are different, but even if this position is the same. Good.
　また第１実施形態において保持駒３０に凸条３８を、ホルダー２０に縦溝２７を設けているが、保持駒３０に縦溝を、ホルダー２０に凸条を設けてもよい。これらはホルダー２０の斜溝２８と摺動駒５０の凸条５９についても同様である。また本発明のアンダーカット処理機構は、可動型１５１に代えて固定型１０１に組み込むことも可能である。 Further, in the first embodiment, the holding piece 30 is provided with the ridge 38 and the holder 20 is provided with the vertical groove 27, but the holding piece 30 may be provided with the vertical groove and the holder 20 may be provided with the ridge. The same applies to the slanted groove 28 of the holder 20 and the ridge 59 of the sliding piece 50. Further, the undercut processing mechanism of the present invention can be incorporated in the fixed die 101 instead of the movable die 151.
　また本発明のアンダーカット処理機構において、互いに嵌合又は係合する縦溝２７、斜溝２８、凸条３８、５９、嵌合部又は係合部の断面形状は、図に示した矩形であるものに限定されるものではなく断面が円形、三角形等であってもよい。また本発明のアンダーカット処理機構において、ホルダー２０、保持駒３０及び摺動駒５０のそれぞれの移動を規制するガイド手段は、上記実施形態のものに限定されるものではなく、例えば、リニアガイド等を用いてもよい。 Further, in the undercut processing mechanism of the present invention, the cross-sectional shape of the vertical groove 27, the oblique groove 28, the ridges 38 and 59, the fitting portion or the engaging portion which are fitted or engaged with each other is the rectangle shown in the drawing. However, the cross section may be circular, triangular or the like. Further, in the undercut processing mechanism of the present invention, the guide means for restricting the movement of each of the holder 20, the holding piece 30, and the sliding piece 50 is not limited to that of the above embodiment, and for example, a linear guide or the like. May be used.
　第１実施形態では、角部Ｃ１、Ｃ２に噛みつき防止用の面取りが施されているが、本発明のアンダーカット処理機構及び成形用金型において、各構成部材の角及び側稜にＲ面取りやＣ面取り等が施されていてもよい。 In the first embodiment, the corner portions C1 and C2 are chamfered to prevent biting. C chamfering may be applied.
　本発明のアンダーカット処理機構及び成形用金型に使用される各構成部材の材質は、特定の材質に限定されるものではなく、公知のアンダーカット処理機構及び成形用金型に使用される部材の材質と同様のものを適宜用いればよい。ただし各構成部材における摺動面は、摺動性の良好な材質又は摺動性の良好な表面処理が施された材料を用いることが好ましい。なお各摺動面は、面接触であるものに限定されるものではなく、線接触や点接触であってもよい。 The material of each constituent member used in the undercut processing mechanism and the molding die of the present invention is not limited to a specific material, and a member used in a known undercut processing mechanism and a molding die. The same material as the above may be appropriately used. However, it is preferable to use a material having good slidability or a surface-treated material having good slidability for the sliding surface of each component. Note that each sliding surface is not limited to a surface contact, and may be a line contact or a point contact.
　また本発明のアンダーカット処理機構は、水平、垂直又はその他の方向に開閉する成形用金型に適用可能である。本発明のアンダーカット処理機構は、成形用金型に１つ組み込まれていても、２つ、３つ以上組み込まれていてもよい。本発明のアンダーカット処理機構を２つ以上備える成形用金型であってもエジェクタ機構は１つでよく、また一段の突き出し操作で成形品を突き出すことができる。 Also, the undercut processing mechanism of the present invention can be applied to a molding die that opens and closes horizontally, vertically, or in other directions. The undercut processing mechanism of the present invention may be incorporated in the molding die one, or two or three or more. Even if the molding die includes two or more undercut processing mechanisms of the present invention, only one ejector mechanism is required, and the molded product can be ejected by a single-step ejection operation.
　また本発明のアンダーカット処理機構及び成形用金型は、射出成形金型以外にダイカスト金型のようなモールド金型、モールドプレス成形金型などに好適に使用することができる。 Further, the undercut processing mechanism and the molding die of the present invention can be suitably used for molding dies such as die casting dies, mold press molding dies, etc. in addition to the injection dies.
　以上のとおり、図面を参照しながら好適な実施形態を説明したが、当業者であれば、本明細書を見て、自明な範囲内で種々の変更及び修正を容易に想定するであろう。従って、そのような変更及び修正は、請求の範囲から定まる発明の範囲内のものと解釈される。 As described above, the preferred embodiments have been described with reference to the drawings, but those skilled in the art will easily envision various changes and modifications within the obvious scope by viewing the present specification. Therefore, such changes and modifications are construed as being within the scope of the invention defined by the claims.
１　成形用金型
１１　アンダーカット処理機構
２０　ホルダー
２５　内壁面
２７　縦溝
２８　斜溝
３０　保持駒
３１　本体
３８　凸条
４０　凸条
４５　突出部
４６　蟻溝
５０　摺動駒
５１　本体
５８　当接面
５９　凸条
６０　爪
６５　凹部
７０　ストッパ
７２　当接面
８０　成形コア
９０　ボールプランジャ
１０１　固定型
１５１　可動型
１９０　エジェクタ機構
１９１　エジェクタ台板
１９２　エジェクタピン
２００　突き出しピン
Ｐ　成形品
Ｐ１　アンダーカット部
Ｐ２　突出部
Ｃ１、Ｃ２　角部
Ｈ１、Ｈ２、Ｈ３　地点 DESCRIPTION OF SYMBOLS 1 Molding die 11 Undercut processing mechanism 20 Holder 25 Inner wall surface 27 Vertical groove 28 Oblique groove 30 Holding piece 31 Main body 38 Convex ridge 40 Convex ridge 45 Projection 46 Dovetail groove 50 Sliding piece 51 Main body 58 Contact surface 59 Convex Article 60 Claw 65 Recess 70 Stopper 72 Abutment surface 80 Molding core 90 Ball plunger 101 Fixed mold 151 Movable mold 190 Ejector mechanism 191 Ejector base plate 192 Ejector pin 200 Ejection pin P Molded product P1 Undercut part P2 Projection parts C1, C2 Square Part H1, H2, H3 point

Claims (13)

  1. 　アンダーカット部のある成形品を成形する、前記成形品を突き出すエジェクタ機構を備える成形用金型の固定型又は可動型に取付け使用されるアンダーカット処理機構であって、
    　前記アンダーカット部を成形する成形コアを備え、保持駒に連係し進退する摺動駒と、
    　前記固定型又は前記可動型に固定され又は前記固定型又は前記可動型に一体的に設けられ、前記成形コアがアンダーカット部から外れるように前記摺動駒を案内するガイド手段を備えるホルダーと、
    　前記ホルダーにガイドされ前記エジェクタ機構に連係し進退する保持駒と、
    　前記保持駒と前記摺動駒とを摺動自在に連結する連結手段と、
    を備え、
    　前記連結手段は、前記摺動駒が規定された位置まで移動すると、前記保持駒と前記摺動駒との連結を解く離脱機構を備えることを特徴とするアンダーカット処理機構。     An undercut processing mechanism used for mounting a fixed mold or a movable mold of a molding die having an ejector mechanism for ejecting the molded product, which is used for molding a molded product having an undercut portion,
    A sliding piece that includes a molding core that molds the undercut portion, and that moves forward and backward in association with a holding piece;
    A holder fixed to the fixed mold or the movable mold or provided integrally with the fixed mold or the movable mold, the holder including guide means for guiding the sliding piece so that the molding core is removed from the undercut portion;
    A holding piece that is guided by the holder and moves forward and backward in cooperation with the ejector mechanism;
    Connecting means for slidably connecting the holding piece and the sliding piece,
    Equipped with
    The undercut processing mechanism, wherein the connecting means includes a releasing mechanism that releases the connection between the holding piece and the sliding piece when the sliding piece moves to a specified position.
  2. 　前記保持駒は、本体の先端に進退方向と交差する方向に伸びる、爪が係止可能な凸条を有し、
    　前記凸条の一部は、前記本体の側面から突出した突出部であり、
    　前記保持駒の本体と前記凸条との間に前記爪が摺動自在に嵌り込む蟻溝が設けられ、
    　前記摺動駒は、前記爪を有し、前記爪の上方は開口し、
    　前記凸条の突出部は、前記爪の上方に移動可能でかつ前記爪の下方に移動不能であり、
    　前記連結手段が、前記凸条と前記蟻溝と前記爪とで構成されてなることを特徴とする請求項１に記載のアンダーカット処理機構。     The holding piece has a protrusion at the tip of the main body, which extends in a direction intersecting with the advancing/retreating direction, and in which a claw can be locked,
    Part of the ridge is a protrusion protruding from the side surface of the main body,
    A dovetail groove into which the claw is slidably fitted is provided between the main body of the holding piece and the ridge,
    The sliding piece has the claw, and the upper side of the claw is open,
    The protruding portion of the ridge is movable above the claw and immovable below the claw,
    The undercut processing mechanism according to claim 1, wherein the connecting means is configured by the projection, the dovetail groove, and the claw.
  3. 　さらに前記保持駒との連結が解かれた前記摺動駒の位置、その姿勢を保持する１以上の位置姿勢保持手段を備えることを特徴とする請求項１又は請求項２に記載のアンダーカット処理機構。 The undercut processing mechanism according to claim 1 or 2, further comprising one or more position/orientation holding means for holding the position and the posture of the sliding piece which is not connected to the holding piece. ..
  4. 　前記位置姿勢保持手段は、前記摺動駒に設けられた２つの当接面を備え、
    　第１の当接面は、前記ホルダーの側面内壁に当接する該側面内壁に平行な面であり、
    　第２の当接面は、前記保持駒の本体側面に当接する該本体側面に平行な面であり、
    　前記第１の当接面が前記ホルダーの側面内壁に当接し、前記第２の当接面が前記保持駒の本体側面に当接し、
    　前記摺動駒の位置、その姿勢を保持することを特徴とする請求項３に記載のアンダーカット処理機構。     The position/orientation holding unit includes two contact surfaces provided on the sliding piece,
    The first contact surface is a surface parallel to the side surface inner wall that contacts the side surface inner wall of the holder,
    The second contact surface is a surface parallel to the side surface of the main body that contacts the side surface of the main body of the holding piece,
    The first contact surface contacts the inner wall of the side surface of the holder, and the second contact surface contacts the side surface of the main body of the holding piece,
    The undercut processing mechanism according to claim 3, wherein the position and the posture of the sliding piece are held.
  5. 　前記位置姿勢保持手段は、前記摺動駒、前記ホルダー、前記保持駒のうち１以上に設けられ、前記保持駒との連結が解かれた前記摺動駒を前記ホルダー、又は前記保持駒、又は前記ホルダーと前記保持駒とに着脱自在に係止させる係止手段であることを特徴とする請求項３に記載のアンダーカット処理機構。 The position/orientation holding means is provided in at least one of the sliding piece, the holder, and the holding piece, and the sliding piece whose connection with the holding piece is released is the holder, the holding piece, or the 4. The undercut processing mechanism according to claim 3, wherein the undercut processing mechanism is a locking means for removably locking the holder and the holding piece.
  6. 　前記係止手段が、ボールプランジャ、又は板ばね、又は凹部に着脱自在に嵌り込む凸部を有する弾性体であることを特徴とする請求項５に記載のアンダーカット処理機構。 The undercut processing mechanism according to claim 5, wherein the locking means is a ball plunger, a leaf spring, or an elastic body having a convex portion that is detachably fitted into the concave portion.
  7. 　さらに前記ホルダーに対する前記保持駒の姿勢を保持する姿勢保持手段を備えることを特徴とする請求項１から請求項６のいずれか１項に記載のアンダーカット処理機構。 The undercut processing mechanism according to any one of claims 1 to 6, further comprising posture holding means for holding the posture of the holding piece with respect to the holder.
  8. 　前記姿勢保持手段は、凸条と前記凸条が摺動自在に嵌り込む溝とで構成され、
    　前記ホルダーの内壁面及び前記保持駒それぞれに前記凸条及び溝のいずれか一方が設けられていることを特徴とする請求項７に記載のアンダーカット処理機構。     The posture maintaining means includes a ridge and a groove into which the ridge is slidably fitted,
    The undercut processing mechanism according to claim 7, wherein either one of the protrusion and the groove is provided on each of the inner wall surface of the holder and the holding piece.
  9. 　前記ホルダーに少なくとも前記保持駒と前記摺動駒とが組み込まれユニット化されてなることを特徴とする請求項１から請求項８のいずれか１項に記載のアンダーカット処理機構。 The undercut processing mechanism according to any one of claims 1 to 8, wherein at least the holding piece and the sliding piece are incorporated into the holder to form a unit.
  10. 　前記保持駒の本体の上面と側面との角部のうち少なくとも前記保持駒との連結が解かれた前記摺動駒と対向する角部、及び前記摺動駒の本体の底面と側面との角部のうち少なくとも前記摺動駒との連結が解かれた前記保持駒と対向する角部には、互いの噛みつきを防ぐ面取りが施されていることを特徴とする請求項１から請求項９のいずれか１項に記載のアンダーカット処理機構。 Of the corners of the upper surface and the side surface of the main body of the holding piece, at least the corners facing the sliding piece that is disconnected from the holding piece, and the corners of the bottom surface and the side surface of the main body of the sliding piece. 10. A chamfer for preventing biting of each other is provided at least at a corner portion facing the holding piece that is disconnected from the sliding piece. The undercut processing mechanism according to item 1.
  11. 　請求項１から請求項１０のいずれか１項に記載のアンダーカット処理機構を１以上備える可動型又は固定型。 A movable type or a fixed type having at least one undercut processing mechanism according to any one of claims 1 to 10.
  12. 　請求項１から請求項１０のいずれか１項に記載のアンダーカット処理機構を１以上備える備える成形用金型。 A molding die including at least one undercut processing mechanism according to any one of claims 1 to 10.
  13. 　請求項１から請求項１０のいずれか１項に記載のアンダーカット処理機構、又は請求項１１に記載の可動型又は固定型、又は請求項１２に記載の成形用金型で成形された成形品であって、
    　前記アンダーカット部を抜く方向の先に突出した部位を有する成形品。     A molded product molded by the undercut processing mechanism according to any one of claims 1 to 10, the movable mold or the fixed mold according to claim 11, or the molding die according to claim 12. And
    A molded article having a portion protruding in the direction of pulling out the undercut portion.
PCT/JP2019/007593 2019-02-27 2019-02-27 Undercut processing mechanism, molding die, and molded article WO2020174615A1 (en)

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CN113334705A (en) * 2021-05-10 2021-09-03 宁波方正汽车模具股份有限公司 Slide block driving mechanism for die
WO2023010720A1 (en) * 2021-08-02 2023-02-09 浙江凯华模具有限公司 Rack angle lifter mechanism for injection mold

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WO2018193502A1 (en) * 2017-04-17 2018-10-25 株式会社テクノクラーツ Holding unit and protruding mechanism of molding mold provided with holding unit

Patent Citations (2)

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JP2007176047A (en) * 2005-12-28 2007-07-12 Technocrats Corp Mold unit for resin molding
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN113334705A (en) * 2021-05-10 2021-09-03 宁波方正汽车模具股份有限公司 Slide block driving mechanism for die
CN113334705B (en) * 2021-05-10 2022-06-21 宁波方正汽车模具股份有限公司 Slide block driving mechanism for die
WO2023010720A1 (en) * 2021-08-02 2023-02-09 浙江凯华模具有限公司 Rack angle lifter mechanism for injection mold

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