JP2005212305A - Method for attaching core supporting rod of resin molding mold device and attaching structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for attaching a core supporting rod to a resin molding mold device to make the core supporting rod be able to move smoothly while the moving direction of the core supporting rod with the movement of a movable plate is made to agree accurately with its axial direction and the attachment structure of the core supporting rod. <P>SOLUTION: With a core 4 fitted to the body mold 3 of the mold device 1, the upper end part of the core supporting rod 7 is inserted into the rod fastening hole 4c of the core 4 through the rod insertion hole 8 of the body mold 3 and fastened. An intermediate unit 10 holding a spherical bush 13 having a guide hole 12 into which the intermediate part of the core supporting rod 7 is inserted freely tumblably is attached to the fixed body mold 3 to be able to adjust an attachment position. A spherical bush 19 having a guide hole 18 into which the lower end part of the core supporting rod 7 is inserted is held freely tumblably by a slide member 20, and a slide unit 11 making the slide member 20 movable along a slide path 23 is attached to the movable plate 24 to be able to adjust the attachment position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method of assembling a core support rod for moving a core for forming an undercut portion in a resin molded product to a mold apparatus, and an assembly structure thereof.

  In a mold apparatus for molding a resin molded product having an undercut portion such as an automobile bumper, as seen in JP-A-2002-326233 (Patent Document 1), etc., in order to remove the molded product from the mold, The core is attached to one of the main body molds of the mold main body composed of the movable main body mold and the fixed main body mold. The core has a molding surface for forming a part including an undercut portion of the resin molded product, and a part of the contact surface with the one body mold is a movable body mold and a fixed body of the mold body. The main body mold is inclined with respect to the mold opening direction (usually the vertical direction). The core is connected to one end of a core support rod provided through the one main body mold (or a partial mold integrally fixed thereto) in a posture parallel to the contact surface. The other end of the core support rod is supported by a movable plate that is provided so as to be movable relative to the one main body mold in the same direction as the mold opening direction of the mold main body. In this case, the other end of the core support rod is attached to the movable plate so that it can move in a direction (for example, horizontal direction) intersecting the axial direction of the core support rod as the movable plate moves in the mold opening direction. It is supported via a slide member. The core support rod is moved together with the core in the axial direction by cooperation of the movement of the movable plate in the mold opening direction and the accompanying movement of the slide member.

  By the way, in the thing of FIG. 1 and FIG. 2 of the said patent document 1, a core support rod is provided by the rod insertion hole drilled so that a core support rod may be penetrated in the partial type | mold integral with the movable main body type | mold as said one main body type | mold. The inclination angle (inclination in the axial direction) is defined, while the moving direction of the core support rod is defined by a guide rod provided in parallel with the core support rod.

  However, both ends of the guide rod are assembled to the movable body mold and the pedestal plate provided below the movable body mold via the holder, and are separate from the movable body mold. It is generally difficult to ensure a high degree of parallelism between the axis of the rod insertion hole that defines the inclination angle of the core support rod and the axis of the guide rod. For this reason, when the core support rod moves, an excessive frictional force is partially generated between the core support rod and the inner peripheral surface of the rod insertion hole, and the core support rod and the core may not move smoothly. There is.

Moreover, in the thing of the said patent document 1, the precision of the partial type | mold rod insertion hole by the side of a movable body is not made very high precision (the diameter of a rod insertion hole is made larger than the outer diameter of a core support rod). By moving the movable plate side end of the core support rod loosely on the slide member, the movement direction of the core support rod during the movement of the movable plate (direction of force acting on the core support rod) and its axis A technique (in FIG. 3 of Patent Document 1) that automatically matches the direction has also been proposed. However, with this technology, it is difficult to reliably regulate the moving direction of the core in accordance with the movement of the support plate in a certain direction, so that an excessive frictional force is partially applied between the core and the body mold on which the core is mounted. May cause wear of the core. Furthermore, there is a disadvantage in that an eccentric load acts on the pin for supporting the core support rod on the slide member, and the pin is easily damaged.
1 to 3 of JP-A-2002-326233

  The present invention has been made in view of such a background, and can smoothly move the core support rod while matching the movement direction of the core support rod accompanying the movement of the movable plate with the axial direction with high accuracy. It is another object of the present invention to provide an assembling method and an assembling structure capable of assembling the core support rod to a resin mold apparatus.

The method of assembling the core support rod of the resin molding die apparatus of the present invention is to either one of the movable body mold and the fixed body mold constituting the mold body so as to form an undercut portion in the resin molded product. The mounted core extends in a direction inclined with respect to the mold opening direction of the movable body mold and the fixed body mold, and one end is connected to the core, and the other end is connected to the one body mold. A core support rod provided so as to pass through the one main body mold through a provided rod insertion hole, and is provided to be movable in the same direction as the mold opening direction facing the other end of the core support rod. A movable plate and a slide member for holding the other end of the core support rod, and the other end of the core support rod can be moved together with the slide member in a direction intersecting the axial direction of the core support rod. Supported by the movable plate A slide unit that moves the movable plate in the mold opening direction and the accompanying movement of the other end of the core support rod together with the core. This is a method of assembling the core support rod in a resin mold apparatus that is moved in the center direction. In order to achieve the above object, the assembling method of the present invention includes a first guide member having a guide hole into which an intermediate portion of the core support rod can be inserted concentrically, with the guide hole in a desired direction. Prepare an intermediate unit to hold in advance so that it can be tilted, and a second guide member having a guide hole into which the other end of the core support rod can be inserted concentrically so that the guide hole can tilt in a desired direction. It is provided in advance in the slide member of the slide unit, and further, at least the diameter of the portion passing through the rod insertion hole of the core support rod is formed to be smaller than the rod insertion hole,
With the core attached to the one main body mold, after inserting one end of the core support rod into the fastening hole previously drilled in the core through the rod insertion hole and fastening to the core, The intermediate unit formed by inserting the intermediate portion exposed from the rod insertion hole of the core support rod into the guide hole of the first guide member is assembled to the one main body mold, and the other end portion of the core support rod The slide unit is inserted into the guide hole of the second guide member and is assembled to the movable plate.

  According to the assembling method of the present invention, first, one end of the core support rod is inserted into the fastening hole of the core attached to the one main body mold via the rod insertion hole, and the core support rod is inserted into the fastening hole. Concluded concentrically. At this time, since the portion of the core support rod that passes through the rod insertion hole has a smaller diameter than the rod insertion hole, the posture relationship between the core and the core support rod is not restricted by the rod insertion hole. For this reason, the core support rod is not partially pressed against the wall surface of the rod insertion hole, or the core mounted on the one body mold is not partially pressed against the wall surface of the body mold. That is, a state in which the core support rod and the core can smoothly move in the axial direction of the core support rod is ensured.

  After the fastening, the intermediate unit formed by inserting the intermediate portion of the core support rod into the guide hole of the first guide member is assembled to the one main body mold, and the other end portion of the core support rod Is inserted into the guide hole of the second guide member, and the slide unit is assembled to the movable plate. In this case, the guide hole of the first guide member into which the intermediate portion of the core support rod is inserted before the intermediate unit is assembled to the one main body mold is concentric with the axis of the core support rod in the inserted state. (Tilt in the same direction as the core support rod). Similarly, the guide hole of the second guide member into which the other end portion of the core support rod is inserted before the slide unit is assembled to the movable plate is concentric with the axis of the core support rod in the inserted state. (Tilt in the same direction as the core support rod). More specifically, the core support rod and the guide hole are concentric in a state where the core support rod is not partially pressed against the wall surface of the guide hole of each guide member. In addition, the guide holes of the first guide member and the second guide member are also concentric via the core support rod inserted into them. Therefore, the intermediate unit and the slide unit are in a state where the guide holes of the first and second guide members and the core support rods are reasonably concentric (the core support rods smoothly along the guide holes of both guide members). In such a state that it can move in the axial direction), it is assembled to the one main body mold and the movable plate. In this case, the assembly position of the intermediate unit to one main body mold and the assembly position of the slide unit to the movable plate are the core support rod fastened to the fastening hole of the core, the intermediate portion thereof and the other Depending on the positional relationship between the first guide member and the second guide member into which the end portions are inserted, it is variably determined for each mold apparatus.

  Therefore, according to the assembly method of the present invention, when the movable plate is moved after the assembly of the core support rod, the movement direction of the core support rod accompanying the movement (this is the guide of the first and second guide members). It is possible to smoothly move the core support rod while matching with high accuracy in the axial direction.

  In the assembling method of the present invention, the core mounted on the one main body mold is formed so as to contact the one main body mold through a contact surface inclined in substantially the same direction as the core support rod. When the rod is fastened, the inclination angle of the core support rod fastened to the rod fastening hole of the core is smaller than the inclination angle of the contact surface of the core with respect to the die opening direction. It is preferable that a hole is formed.

  According to this, when the core support rod is moved in the axial direction by the movement of the movable plate at the time of mold opening, the core contact surface is not rubbed against the one main body mold. Can be moved together with the core support rod. In addition, depending on the machining accuracy of the rod fastening hole, there may be some variation in the difference between the inclination angle of the rod fastening hole (inclination angle of the core support rod) and the inclination angle of the contact surface of the core. By setting the former inclination angle so that the inclination angle is smaller than the latter inclination angle, the contact surface of the core during the movement of the core support rod and the one body mold Can be surely prevented. As a result, the core and the core support rod can be reliably and smoothly moved.

  In the assembling method of the present invention, the operation of inserting the intermediate portion and the other end portion of the core support rod into the guide holes of the first guide member and the second guide member, respectively, It may be either before or after being fastened to the fastening hole. However, from the viewpoint of ease of assembly work, the following is preferable.

  That is, before inserting and fastening one end of the support rod into the rod fastening hole of the core through the rod insertion hole, the intermediate unit and the slide unit are respectively attached to the one main body mold and the movable plate. A temporary assembling step of adjusting the assembling position in an adjustable manner, and after the temporary assembling, one end of the core support rod is connected to the core through the guide hole of the first guide member and the rod insertion hole; Insert and fasten into the rod fastening hole, and simultaneously insert the intermediate portion of the core support rod into the guide hole of the first guide member, and the other end portion of the core support rod to the guide hole of the second guide member A core support rod mounting step that is inserted and assembled to the second guide member, and after the core support rod mounting step, the intermediate unit and the slide unit are respectively connected to the one of the ones. So that finally assembled in integrated and movable plate.

  According to this, after the intermediate unit and the slide unit are temporarily assembled to the one main body mold and the movable plate, respectively, and the movement (free movement) of the intermediate unit and the slide unit is loosely regulated (temporary assembly). After the execution of the process), the core support rod is inserted and fastened into the rod fastening hole, and the guide members are inserted into the guide holes (the core support rod mounting process is executed). It can be carried out. In this case, the positions of the intermediate unit and the slide unit are adjusted so that the guide holes are automatically concentric with the fastening holes of the core support rod and the core by insertion of the guide members of the core support rod into the guide holes. . Then, since the final assembly of the intermediate unit and the slide unit is performed thereafter, the core support rod and the guide holes of the respective guide members are ensured concentrically.

  Moreover, the assembly structure of the core support rod of the resin molding die apparatus of the present invention is a movable body mold that constitutes a mold body to form an undercut portion in a resin molded product, and to achieve the above-mentioned object. A core mounted on one of the fixed body molds, and one end connected to the core extending in a direction inclined with respect to the mold opening direction of the movable body mold and the fixed body mold A core support rod provided so that the other end passes through the one main body mold through a rod insertion hole provided in the one main body mold, and the mold facing the other end of the core support rod A movable plate provided movably in the same direction as the opening direction; and a slide member for holding the other end of the core support rod, and the other end of the core support rod together with the slide member in the mold opening direction Free to move in the direction that intersects A slide unit to be supported by the movable plate, and the core support rod together with the core by the cooperation of the movement of the movable plate in the mold opening direction and the movement of the other end of the core support rod accompanying the movement of the movable plate. In the resin molding die apparatus that is moved in the axial direction of the core support rod, at least the diameter of the portion of the core support rod that passes through the rod insertion hole is made smaller than the rod insertion hole, An intermediate unit for holding a first guide member having a guide hole into which the intermediate portion of the core support rod can be inserted concentrically so that the guide hole can be inclined in a desired direction, and the other end portion of the core support rod being concentric A second guide member provided in the slide member of the slide unit so that the guide hole can be inclined in a desired direction; A rod fastening hole drilled in the core so as to insert and fasten one end of the core support rod through the rod insertion hole in a state where the body is attached to the one main body mold, And the slide unit are provided so that the assembly position can be adjusted to the one main body mold and the movable plate, respectively.

  According to the assembly structure of the present invention, the portion of the core support rod that passes through the rod insertion hole has a smaller diameter than the diameter of the rod insertion hole, and the intermediate unit and the slide unit are each of the one main body type. And a core support rod inserted and fastened into the rod fastening hole of the core, and an intermediate portion and the other end portion of the core support rod. The intermediate unit and the slide unit are assembled to the one main body mold and the movable plate, respectively, in a state where the guide holes of the first guide member and the guide holes of the second guide member into which the guides are inserted are reasonably concentric. Is possible. Therefore, the core support rod can be assembled to the mold apparatus together with the intermediate unit and the slide unit by the above-described assembly method of the present invention. Therefore, it is possible to smoothly move the core support rod while matching the moving direction of the core support rod accompanying the movement of the movable plate with the axial direction with high accuracy.

  In order to assemble the intermediate unit to the one main body mold so that the assembly position can be adjusted, for example, a screw insertion hole formed in the intermediate unit for screwing the intermediate unit to the one main body mold. May be larger than the diameter of the screw for screw tightening. The same applies to the structure in which the slide unit is assembled to the movable plate.

  In the assembly structure of the present invention, the core mounted on the one main body mold is formed so as to come into contact with the one main body mold through a contact surface inclined substantially in the same direction as the core support rod. And the rod fastening hole is formed such that an inclination angle of the core support rod fastened to the rod fastening hole of the core with respect to the mold opening direction is smaller than an inclination angle of the contact surface of the core with respect to the mold opening direction. It is preferable that

  According to this, as explained with respect to the assembling method, regardless of some variation in the difference between the inclination angle of the core rod fastening hole (inclination angle of the core support rod) and the inclination angle of the contact surface of the core, It is possible to reliably prevent rubbing between the contact surface of the core and the one main body mold when the core support rod is moved. As a result, the core and the core support rod can be reliably and smoothly moved.

  Further, the slide member is provided in the slide unit so as to be movable in a direction substantially perpendicular to the axial direction of the core support rod when the slide unit is assembled to the movable plate. preferable.

  According to this, when the core support rod is moved in the axial direction, the slide member that holds the other end of the core support rod receives the reaction force in the direction that prevents the movement from the core support rod side. Can be prevented. For this reason, the movement of the slide member and the core support rod held by the slide member can be performed smoothly. As a result, in cooperation with the movement of the movable plate, the core support rod can be smoothly moved in the axial direction (direction parallel to the sliding surface of the core).

  In addition, by forming the first guide member and the second guide member in a spherical shape, the inclination of each guide hole can be easily changed to a desired inclination.

  One embodiment of the present invention described above will be described with reference to FIGS. 1 is a longitudinal sectional view of the main part of the mold apparatus of the present embodiment, FIGS. 2A and 2B are cross-sectional views for explaining the assembly structure and functions of the main part of FIG. FIG. 3 is a cross-sectional view of the slide unit as seen in the cross section taken along line III-III in FIG.

  Referring to FIG. 1, a resin molding die apparatus 1 according to the present embodiment includes a movable main body mold 2 and a fixed main body mold 3 that constitute the mold main body, and a core 4 is detachably attached to the fixed main body mold 3. It is attached to. The movable body mold 2 can be moved up and down by an actuator (not shown). The state shown in the figure is a state in which the movable body mold 2 is lowered and clamped, and the cavity 5 for molding the resin molded product W between the movable body mold 2, the fixed body mold 3 and the core 4 in this clamped state. Is formed. In this case, a part 4 a of the molding surface facing the cavity 5 of the core 4 (upper right end portion of the core 4 shown in the figure) is a part for forming the undercut portion Wu in the resin molded product W. The resin molded product W is, for example, an automobile bumper. The movable main body mold 2 and the fixed main body mold 3 do not need to be configured by one block, but may be configured by integrally fixing a plurality of blocks to each other.

  The core 4 is mounted on the core mounting recess 6 with its surface excluding its molding surface (surface facing the cavity 5) in contact with the wall surface of the core mounting recess 6 provided on the fixed main body mold 3. . In this case, one side surface portion of the core 4 in the core mounting recess 6 (the left side surface portion of the core 4 shown in the figure) is in the vertical direction, that is, the mold opening direction (vertical direction) of the movable main body mold 2 and the fixed main body mold 3. It is in contact with the fixed main body mold 3 through a contact surface 4b inclined by a certain angle θ1. After the movable main body mold 2 is moved upward from the state shown in the drawing and the mold is opened, the core 4 is moved obliquely upward in the direction of the alternate long and short dash line C in the figure (a direction substantially parallel to the contact surface 4b). The resin molded product W can be taken out by being detached from the mounting recess 6.

  One end (upper end) of the core support rod 7 is fastened to the lower portion of the core 4. The core support rod 7 passes through the fixed main body mold 3 through the rod insertion hole 8 drilled in the fixed main body mold 3 from the bottom surface of the core mounting recess 6 to the lower surface of the fixed main body mold 3. Projecting downward. The fastening structure between the core 4 and the core support rod 7 will be further described. A rod fastening hole 4c, which is a screw hole extending obliquely in the vertical direction, is formed in the lower portion of the core 4. The rod fastening hole 4 c opens into the rod insertion hole 8 of the fixed body mold 3 in a state where the core 4 is mounted in the core mounting recess 6. Then, a screw portion 9 formed on the upper end portion of the core support rod 7 is inserted concentrically into the rod fastening hole 8 from below the fixed main body mold 3 through the rod insertion hole 8, and thereby screwed. A rod 7 is fastened to the core 4. In this case, the inclination angle θ2 of the rod fastening hole 8 and the axis C of the core support rod 7 fastened thereto with respect to the vertical direction (mold opening direction) is slightly smaller than the inclination angle θ1 of the contact surface 4b of the core 4. A rod fastening hole 8 is bored so as to have an angle (for example, about 1 ° smaller) (so that at least θ2 does not become larger than θ1). However, because of the processing accuracy of the rod fastening hole 4c of the core 4 and the like, the relative angle between the contact surface 4b of the core 4 and the rod fastening hole 8 (difference between [theta] 1 and [theta] 2) must be accurately secured to a predetermined value. Generally difficult and causes some variation. For this reason, the design value of the inclination angle θ2 of the rod fastening hole 8 is set so that θ2 does not become larger than θ1 in consideration of the variation.

  The diameter of the rod insertion hole 8 is larger than the outer diameter of the core support rod 7. In this embodiment, the rod insertion hole 8 has a small diameter portion 8a having a diameter slightly larger than the outer diameter of the rod insertion hole 8 at a portion near the core mounting recess 6, and a diameter larger than that of the small system portion 8a. The large-diameter portion 8b is connected to the lower side of the small system portion 8a.

  An intermediate unit 10 is assembled to an intermediate portion of the core support rod 7 protruding downward from the rod insertion hole 8 (intermediate portion of the core support rod 7 in the longitudinal direction), and a lower end portion of the core support rod 7 (others) The slide unit 11 is assembled to the end portion. The intermediate unit 10 holds a first spherical bush 13 that is a spherical first guide member in which a guide hole 12 having substantially the same diameter as the outer diameter of the core support rod 7 is formed, and the first spherical bush 13. And a bush holder 14. The guide hole 12 of the first spherical bush 13 is provided through the center of the first spherical bush 13, and a part of the outer peripheral surface of the first spherical bush 13 excluding the locations of both open ends of the guide hole 12 is formed. The bush holder 14 is supported by being brought into sliding contact with a spherical receiving surface 14a. Thereby, the bush holder 14 holds the first spherical bush 13 so that the guide hole 12 can roll in a desired direction with respect to the vertical direction. And the intermediate part of the core support rod 7 is slidably inserted in the guide hole 12 of the 1st spherical bush 13 concentrically. Further, an assembly plate 15 is fixed to the bush holder 14 with screws or the like (not shown), and the assembly plate 15 is attached to the fixed main body mold 3 at the periphery of the opening end of the rod insertion hole 8 of the fixed main body mold 3. A plurality of bolts 16 interposed between the bush holder 14 and penetrating the assembly plate 15 are screwed to the lower surface portion of the fixed main body mold 3.

  This assembly structure will be described in further detail with reference to FIGS. 2 (a) and 2 (b). 2A and 2B, reference numerals without parentheses correspond to the assembly structure of the intermediate unit 10 to the fixed main body mold 3, and reference numerals with parentheses will be described later. This corresponds to the assembly structure of the slide unit 11.

  As shown in FIG. 2A, each bolt 16 is a so-called shoulder bolt, and a neck portion where no screw is formed between the head portion 16a and a screw portion 16c where a screw (male screw) is formed. 16b. The neck portion 16b has a larger diameter than the screw portion 16c and a length L2 that is slightly longer (for example, 0.1 to 0.2 mm longer) than the thickness L1 of the assembly plate 15. The assembly plate 15 has a bolt insertion hole 15a through which the threaded portion 16c and the neck portion 16b of each bolt 16 are inserted. The bolt insertion hole 15a has a larger diameter than the neck portion 16b of the bolt 16. Is formed. It should be noted that the depth of the screw hole 3a of the fixed main body mold 3 for screwing the screw portion 16c of the bolt 16 is deeper than the length of the screw portion 16c. The assembly plate 15 has a washer 17 interposed between the plate 16 and the head 16a of the bolt 16, and the screw portion 16c of the bolt 16 is connected to the screw hole 3a of the fixed body mold 3 via the bolt insertion hole 15a. By screwing, the assembly plate 15 is fixed to the fixed main body mold 3 so as to be sandwiched between the washer 17 and the fixed main body mold 3. Thereby, the bush holder 14 and the assembly plate 15 of the intermediate unit 10 are fixed to the fixed main body mold 3.

  Here, as described above, the diameter of the neck portion 16b of each bolt 16 is larger than the diameter of the screw portion 16c, and the length L2 of the neck portion 16b is slightly longer than the thickness L1 of the assembly plate 15. For this reason, as shown in FIG. 2 (b), when the bolt 16 is tightened in the screw hole 3a of the fixed main body mold 3 without using the washer 17, the end surface of the neck portion 16a on the threaded portion 16c side is the fixed main body mold. 3), a clearance (L2) slightly thicker than the thickness of the assembly plate 15 is formed between the head 16a and the fixed main body mold 3. As described above, the diameter of the bolt insertion hole 15a of the assembly plate 15 is larger than that of the neck 16b of each bolt 16. For this reason, when the bolts 16 are tightened in the screw holes 3a of the fixed main body mold 3 as described above without using the washers 17, the assembly plate 15 is interposed between the bolts 16 and the fixed main body mold 3. Since it is not clamped, the position of the assembly plate 15 can be adjusted along the lower surface of the fixed main body mold 3 (in the horizontal direction). This position adjustment is possible within a range where the neck 16b of the bolt 16 does not contact the wall surface of the bolt insertion hole 15a.

  As shown in FIGS. 1 and 3, the slide unit 11 includes a second spherical bush 19 that is a spherical second guide member in which a guide hole 18 into which the other end of the core support rod 7 is inserted, A bush holder 20 as a slide member for holding the second spherical bush 19 and a direction intersecting the axis C of the core support rod 7 with the other end inserted into the guide hole 18 (see FIG. 1). And a rail member 21 slidably held in the direction of arrow A). The guide hole 18 of the second spherical bush 19 is a through-hole passing through the center of the second spherical bush 19, and one end portion side thereof is a large diameter portion 18 a having substantially the same diameter as the outer diameter of the core support rod 7. The other end portion is a small-diameter portion 18b having a smaller diameter than the large-diameter portion 18a. The other end portion of the core support rod 7 is inserted concentrically from the opening end of the large diameter portion 18a of the guide hole 18 to the boundary portion with the small diameter portion 18b, and the core support rod 7 is inserted from the opening end of the small diameter portion 18b. A bolt 22 inserted toward the end is screwed to the other end of the core support rod 7. As a result, the lower end portion of the core support rod 7 is fixed to the second spherical bush 19.

  As shown in FIG. 3, the bush holder 20 is supported by sliding a part of the outer peripheral surface of the second spherical bushing 19 except for the positions of both opening ends of the guide hole 18 to the spherical receiving surface 20a. Thus, the second spherical bush 19 is held so as to roll freely so that the guide hole 18 can be inclined in a desired direction.

  As shown in FIG. 3, the rail member 21 is composed of a pair of rail member halves 21a and 21a each having a sliding path 23 in which both side portions of the bush holder 20 are slidably fitted. The bush holder 20 is slidably held along the sliding path 23 between the rail member halves 21a and 21a. In this case, the direction of the sliding path 23, that is, the direction in which the bush holder 20 is movable is set such that the lower end portion of the core support rod 7 is guided to the guide hole 18 (large diameter portion 18a) of the second spherical bush 19, as shown in FIG. In the state of being inserted into the core support rod 7, the core support rod 7 is inclined with respect to the horizontal direction so as to extend in a direction substantially perpendicular to the axis C (the direction of arrow A in FIG. 1). The rail member halves 21a and 21a extend in the direction in which the lower portions of both ends in the extending direction of the sliding path 23 cross the sliding path 23 (interval direction of the rail member halves 21a and 21a). They are connected and integrated through an existing connecting plate 21b. The rail member 21 is accommodated in a concave portion 25 formed on a movable plate 24 that can be moved up and down by an actuator (not shown) on the lower side of the fixed body mold 3 and is formed on a horizontal bottom surface of the concave portion 25. At this point, the movable plate 24 is screwed to the movable plate 24 by a plurality of bolts 26 that penetrate the movable plate 24 from below toward the rail member halves 21a of the rail member 21.

  Here, the assembly structure of the movable plate 24 and the rail member 21 of the slide unit 11 will be further described. The assembly structure is fixed to the intermediate unit 10 as indicated by reference numerals with parentheses in FIG. This is the same as the assembly structure with the main body mold 3. That is, as indicated by reference numerals with parentheses in FIG. 2A, the head 26a of each bolt 26 (shoulder bolt) composed of the head 26a, the neck 26b, and the screw 26c and the movable plate 24. The screw part 26c of the bolt 26 is screwed into the screw hole 21aa of the rail member half 21a of the slide unit 11 through the bolt insertion hole 24a formed in the movable plate 24 with the washer 27 interposed therebetween. The movable plate 24 is sandwiched between the washer 27 and the rail member half 21 a, whereby the rail member 21 is fixed to the movable plate 24.

  In this case, the diameter of the neck portion 26b of each bolt 26 is larger than the diameter of the screw portion 26c, and the length L4 of the neck portion 26b is larger than the thickness L3 of the movable plate 24 (thickness at the position of the recess 25). Slightly long. The diameter of the bolt insertion hole 24 a of the movable plate 24 is larger than the diameter of the neck portion 26 b of each bolt 26. For this reason, when the bolt 26 is tightened in the screw hole 21aa of the rail member half body 21a without using the washer 27, as indicated by the reference numerals with parentheses in FIG. 2B (the screw portion 26c of the neck portion 26a). A clearance slightly thicker than the thickness of the movable plate 24 is formed between the head 26a and the rail member half 21a, and the rail 26 The position of the half member 21a (and thus the entire slide unit 11) can be adjusted along the bottom surface of the recess 25 of the movable plate 24 (in the horizontal direction). This position adjustment is possible within a range in which the neck portion 26b of the bolt 26 does not contact the wall surface of the bolt insertion hole 24a.

  Note that the side wall of the concave portion 25 of the movable plate 24 facing the one end side of the slide path 23 of the slide unit 11 (the right end side of the slide path 23 in FIG. 1) has a bush toward the one end side of the slide path 23. A stopper pin 28 for restricting the movement limit position of the holder 20 is provided protruding toward the bush holder 20.

Next, a method for assembling the core support rod 7 of the mold apparatus 1 of the present embodiment will be described with reference to FIGS. 1 and 2. The assembly of the core support rod 7 is performed, for example, by the following procedures (1) to (6).
(1) The core 4 is mounted in the core mounting recess 6 of the fixed main body mold 3.
(2) The intermediate unit 10 is temporarily assembled to the fixed body mold 3. More specifically, with the assembly plate 15 of the intermediate unit 10 fixed to the bush holder 14, the assembly plate 15 contacts the lower surface of the fixed main body mold 3 at the periphery of the opening end of the rod insertion hole 8. In this state, as shown in FIG. 2 (b), a plurality of bolts 16 are fastened to the fixed main body mold 3 through the bolt insertion holes 17 of the assembly plate 15 without using the washer 17. Then, the neck portion 16 b of each bolt 16 is brought into contact with the fixed main body mold 3. At this time, as described above, the intermediate unit 10 is movable along the lower surface of the fixed main body mold 3 as long as the bolt 16 does not contact the wall surface of the bolt insertion hole 15.
(3) The slide unit 11 is temporarily assembled to the movable plate 24. More specifically, with respect to the temporary assembly of the slide unit 11, after the slide unit 11 is accommodated in the recess 25 of the movable plate 24, as shown in FIG. The plurality of bolts 26 are fastened to the rail member half 21a of the slide unit 11 from below the movable plate 24 through the bolt insertion holes 24a, and the neck portions 26b of the bolts 26 are brought into contact with the rail member half 21a. At this time, as described above, the slide unit 11 is movable along the bottom surface of the concave portion 25 of the movable plate 24 within a range in which the bolt 26 does not contact the wall surface of the bolt insertion hole 24a.
(4) One end portion (upper end portion in the figure) of the core support rod 7 on the threaded portion 9 side is provided below the intermediate unit 10 via the guide hole 12 of the first spherical bush 13 and the rod insertion hole 8 of the fixed body mold 3. Are inserted into the rod fastening hole 4c of the core 4 and the threaded portion 9 of the core support rod 7 is fastened to the rod fastening hole 4c. At this time, the core support rod 7 is concentric with the rod fastening hole 4c. At the same time, the intermediate portion of the core support rod 7 is inserted into the guide hole 12 of the first spherical bush 13 of the intermediate unit 10, so that the guide hole 12 becomes the axis C (= rod fastening hole 4 c) of the core support rod 7. And the guide hole 12 and the core support rod 7 are concentric (the outer peripheral surface of the intermediate portion of the core support rod 7 is uniformly in contact with the inner peripheral surface of the guide hole 12). As the intermediate unit 10 moves slightly along the lower surface of the fixed main body mold 3, the relative position of the intermediate unit 10 with respect to the fixed main body mold 3 is automatically adjusted.
(5) The lower end portion of the core support rod 7 is inserted into the guide hole 18 (large diameter portion 18 a) of the second spherical bush 19 of the slide unit 11, and fastened to the second spherical bush 19 with a bolt 22. More specifically, the lower end portion of the core support rod 7 is moved in a state where the movable plate 24 is raised toward the fixed body mold 3 to a predetermined position and the bush 20 of the slide unit 11 is in contact with the stopper pin 28. The second spherical bush 19 is inserted into the large diameter portion 18 a of the guide hole 18. Further, the bolt 22 is fastened to the core support rod 7 from the small diameter portion 18 b side of the guide hole 18. Note that a hole (not shown) is formed in the bottom surface of the concave portion 25 of the movable plate 24 at a position almost directly below the second spherical bush 19, and the bolt 22 is fastened through the hole. In this case, when the lower end portion of the core support rod 7 is inserted into the large diameter portion 18 a of the guide hole 18 of the second spherical bush 19, the guide hole 18 has the axis C (= the rod fastening hole 4 c of the rod fastening hole 4 c). The guide hole 18 and the core support rod 7 are concentric (the outer peripheral surface of the lower end portion of the core support rod 7 is in uniform contact with the inner peripheral surface of the guide hole 18. As described above, when the slide unit 11 slightly moves along the bottom surface of the recess 25 of the movable plate 24, the relative position of the slide unit 11 with respect to the movable plate 24 is automatically adjusted.
(6) Finally, by holding the intermediate unit 10 at the current position and using the washer 17 as shown in FIG. The assembly plate 15 of the intermediate unit 15 is completely fixed to the fixed main body mold 3. Similarly, while holding the slide unit 11 at the current position, as shown in FIG. 2A, using the washer 27, the bolts 26 on the slide unit 11 side are renewed and the rail member half body 21a of the slide unit 11 is changed. The rail member 21 of the slide unit 11 is completely fixed to the movable plate 24. Thereby, the assembly of the core support rod 7 is completed.

  By assembling the core support rod 7 as described above, the concentricity of the core support rod 7, the guide hole 12 of the first spherical bush 13 and the guide hole 18 of the second spherical bush 19 is ensured with high accuracy without difficulty. . That is, the core support rod 7 can be smoothly moved in the direction of the axis C. In this case, the core support rod 7 is not pressed against the guide holes 12 and 18 of the spherical bushes 13 and 19 so that excessive frictional force is not generated in the portions.

  In the mold apparatus 1 assembled with the core support rod 7 as described above, after molding the resin molded product W in the cavity 5 in the clamped state, the movable body mold 2 is moved upward to open the mold. In this state, the movable plate 24 is moved upward toward the fixed body mold 3 to lift the core 4 from the core mounting recess 5, whereby the resin molded product W is taken out. At this time, when the movable plate 24 is moved upward together with the slide unit 11, the bush holder 20 of the slide unit 11 moves along the sliding path 23 in the left direction of the arrow A in FIG. 1 (the bush holder 20 slides). It moves in the direction of moving diagonally downward along the road 23). The core support rod 7 moves upward in the direction of the axis C together with the core 4 fastened to the upper end portion thereof by the cooperation of the upward movement of the movable plate 24 and the movement of the bush holder 20 along the sliding path 23. To do. In this case, as described above, since the concentricity of the core support rod 7, the guide hole 12 of the first spherical bush 13 and the guide hole 18 of the second spherical bush 19 is ensured with high accuracy, Since no frictional force is generated between the first spherical bush 13 and the inner peripheral surface of the guide hole 12, the first spherical bush 13 moves smoothly in the direction of the axis C. Furthermore, since the angle θ2 with respect to the vertical direction (mold opening direction) of the axis C is slightly smaller than the angle θ1 with respect to the vertical direction of the contact surface 4b of the core 4, the contact surface 4b of the core 4 is that of the fixed body mold 3. It moves in the direction of the axis C of the core support rod 7 without rubbing against the side wall of the core mounting recess 6 and floats up from the core mounting recess 6. Therefore, the core support rod 7 and the core 4 can be moved smoothly without causing wear on the contact surface 4b of the core 4. In addition, since the core 4 is smoothly moved, the resin molded product W is not damaged.

  In the present embodiment, the slide path 23 that defines the moving direction of the bush holder 19 of the slide unit 11 is inclined so as to be substantially orthogonal to the axial direction of the core support rod 7. The reaction force acting on the bush holder 19 when the core support rod 7 is moved in the direction of the axis C by raising and lowering hardly occurs in the moving direction of the bush holder 19 (direction of the sliding path 23). For this reason, the movement of the bush holder 19 along the sliding path 23 can be performed smoothly. As a result, the movement of the core support rod 7 in the direction of the axis C along with the raising and lowering of the movable plate 24 is hindered. Can be performed smoothly without generating a large force.

  In the embodiment described above, the core support rod 7 is attached to the core mounting recess 6 of the fixed body mold 3 in a state where the intermediate unit 10 and the slide unit 11 are temporarily assembled to the fixed body mold 3 and the movable plate 24, respectively. The core 4 is fastened to the mounted core 4. The intermediate portion of the core support rod 7 is inserted into the guide hole 12 of the first spherical bush 13 of the intermediate unit 10, and the lower end portion of the core support rod 7 is inserted into the slide unit 11. The second spherical bushing 19 is inserted into the guide hole 18 and fastened to the second spherical bushing 19 with a bolt 22, and then the upper end of the core support rod 7 is inserted into the core 4 via the rod insertion hole 8 of the fixed main body mold 3. It may be inserted into the rod fastening hole 4 c and fastened to the core 4. After that, the intermediate unit 10 is fastened to the fixed main body mold 3 with a plurality of bolts 16 using a washer 17, and the slide unit 11 is fastened to the movable plate 24 with a plurality of bolts 26 using a washer 27. You may do it. In this case, the work of temporarily assembling the intermediate unit 10 and the slide unit 11 to the fixed main body mold 3 and the movable plate 24 can be omitted. However, from the viewpoint of ease of assembly work, it is preferable to perform temporary assembly work of the intermediate unit 10 and the slide unit 11 as in the above embodiment.

  In the above embodiment, the core is mounted on the fixed body mold. However, the present invention can be applied to a mold apparatus in which the core is mounted on the movable body mold.

The longitudinal cross-sectional view of the principal part of the metal mold | die apparatus in one Embodiment of this invention. (A), (b) is sectional drawing for demonstrating the assembly structure of the intermediate | middle unit and slide unit with which the apparatus of FIG. 1 was equipped. Sectional drawing of the slide unit seen in the III-III line cross section of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mold apparatus, 2 ... Movable main body type, 3 ... Fixed main body type, 4 ... Core, 4b ... Core contact surface, 4c ... Rod fastening hole, 7 ... Core support rod, 8 ... Rod insertion hole, 10 ... Middle Unit: 11 ... Slide unit, 13 ... First spherical bush (first guide member), 12 ... First spherical bush guide hole, 19 ... Second spherical bush (second guide member), 18 ... Second spherical bush Guide hole, 20 ... bush holder (slide member), 24 ... movable plate, W ... resin molded product, Wu ... undercut part.

Claims (7)

A core mounted on one of a movable body mold and a fixed body mold constituting the mold body to form an undercut portion in a resin molded product, and a mold opening direction of the movable body mold and the fixed body mold One end of the core is connected to the core, and the other end penetrates the one main body mold through a rod insertion hole provided in the one main body mold. A core support rod provided; a movable plate that faces the other end of the core support rod and is movable in the same direction as the mold opening direction; and a slide member that holds the other end of the core support rod. A slide unit that supports the other end of the core support rod on the movable plate so as to be movable in a direction intersecting the axial direction of the core support rod together with the slide member, in the mold opening direction. Movable movable Resin mold apparatus for moving the core support rod together with the core in the axial direction of the core support rod by cooperating with the movement of the core and the movement of the other end of the core support rod. In the method of assembling the core support rod,
An intermediate unit is prepared in advance for holding a first guide member having a guide hole into which the intermediate portion of the core support rod can be inserted concentrically so that the guide hole can be inclined in a desired direction. A second guide member having a guide hole in which the other end can be inserted concentrically is provided in advance in the slide member of the slide unit so that the guide hole can be inclined in a desired direction, and at least the core support rod The diameter of the portion passing through the rod insertion hole is formed smaller than the rod insertion hole,
After the core is attached to the one main body mold, one end of the core support rod is inserted into the rod fastening hole previously drilled in the core through the rod insertion hole and fastened, and then the core The intermediate unit formed by inserting the intermediate portion exposed from the rod insertion hole of the support rod into the guide hole of the first guide member is assembled to the one main body mold, and the other end portion of the core support rod is A method of assembling a core support rod of a resin molding die apparatus, wherein the slide unit inserted into a guide hole of a second guide member is assembled to the movable plate.   The core attached to the one main body mold is formed so as to contact the one main body mold through a contact surface inclined substantially in the same direction as the core support rod. The rod fastening hole is formed so that an inclination angle of the fastened core support rod with respect to the mold opening direction is smaller than an inclination angle of a contact surface of the core with respect to the mold opening direction. Item 4. A method for assembling a core support rod of the resin mold apparatus according to Item 1.   Before inserting and fastening one end of the support rod into the rod fastening hole of the core through the rod insertion hole, the intermediate unit and the slide unit are assembled to the one main body mold and the movable plate, respectively. Temporary assembly process for adjusting the position of the core, and after the temporary assembly, one end of the core support rod is fastened to the rod of the core via the guide hole of the first guide member and the rod insertion hole. The core support rod is inserted into the hole and fastened together, and the intermediate portion of the core support rod is inserted into the guide hole of the first guide member, and the other end portion of the core support rod is inserted into the guide hole of the second guide member. A core support rod mounting step to be assembled to the second guide member, and after the core support rod mounting step, the intermediate unit and the slide unit are respectively connected to the one main body mold and Claim 1 or the core method of assembling the support rods of the resin molding die apparatus 2, wherein it has to finally assembled to the movable plate. A core mounted on one of a movable body mold and a fixed body mold constituting the mold body to form an undercut portion in a resin molded product, and a mold opening direction of the movable body mold and the fixed body mold One end of the core is connected to the core, and the other end penetrates the one main body mold through a rod insertion hole provided in the one main body mold. A core support rod provided; a movable plate that faces the other end of the core support rod and is movable in the same direction as the mold opening direction; and a slide member that holds the other end of the core support rod. And a slide unit that supports the other end of the core support rod on the movable plate so as to be movable in a direction intersecting the mold opening direction together with the slide member, and the movable plate extending in the mold opening direction. Move In the resin molding die apparatus so as to move in the axial direction of the core support rod said core support rod together with the core in cooperation with the movement of the other end of said core support rod associated therewith,
The diameter of at least the portion of the core support rod that passes through the rod insertion hole is formed smaller than the diameter of the rod insertion hole,
An intermediate unit for holding a first guide member having a guide hole into which an intermediate part of the core support rod can be inserted concentrically so that the guide hole can be inclined in a desired direction;
A second guide member provided in the slide member of the slide unit so as to have a guide hole into which the other end of the core support rod can be inserted concentrically and the guide hole can be inclined in a desired direction;
A rod fastening hole drilled in the core to insert and fasten one end of the core support rod through the rod insertion hole with the core attached to the one body mold;
The intermediate support unit and the slide unit are provided so that the assembly position of the intermediate unit and the slide unit can be adjusted to the one main body mold and the movable plate, respectively. Assembly structure.   The core attached to the one main body mold is formed so as to contact the one main body mold through a contact surface inclined substantially in the same direction as the core support rod. The rod fastening hole is formed so that an inclination angle of the fastened core support rod with respect to the mold opening direction is smaller than an inclination angle of a contact surface of the core with respect to the mold opening direction. Item 5. The assembly structure of the core support rod according to Item 4.   The slide member is provided in the slide unit so as to be movable in a direction substantially perpendicular to the axial direction of the core support rod when the slide unit is assembled to the movable plate. The assembly structure of the core support rod of the resin molding die apparatus according to claim 4 or 5.   The assembly structure of the core support rod of the resin molding die apparatus according to any one of claims 4 to 6, wherein the first guide member and the second guide member are formed in a spherical shape. .

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