JP5653723B2 - Mold equipment - Google Patents

Description

  The present invention relates to a mold apparatus having a core in which a plurality of members are combined.

  When producing a cast product (for example, a cylindrical member) having a hollow portion by using die casting, a core is disposed in a cavity formed by a mold. In this case, since the core is tightened by contraction during melt solidification, it is common to form a draft on the outer peripheral surface of the core to facilitate the extraction.

  However, since a gradient is also formed in the hollow portion of the cast product due to the draft of the core, it is necessary to cut the surplus portion after casting and make the inner peripheral surface of the hollow portion have the same inner diameter. This is accompanied by an increase in manufacturing process, a decrease in product yield, and the like, which has been a factor in increasing the manufacturing cost of cast products.

  Therefore, a technique has been proposed in which the core is pulled out while being rotated so that the core can be easily pulled out without forming a draft angle. For example, Patent Document 1 discloses an actuator that applies a rotational force to a core during extraction.

JP 2006-17132 A

  However, even when a draft is formed in the core, a pulling force is required in units of several tons, and a large rotational torque and pulling force are required to pull out the core while rotating it. There is a problem that a large actuator is required to apply such force, which leads to an increase in the size of the mold apparatus.

  Therefore, the main object of the present invention is to provide a mold apparatus that not only requires a draft angle but also realizes a compact apparatus.

  The present invention employs the following means in order to solve the above problems.

  That is, in the first invention, a mold apparatus having a core in which a plurality of members are combined in a columnar shape, wherein the core is movable in a direction perpendicular to the central axis thereof. A second member interposed between the first members and capable of being pushed outward by the outward movement of the first member, and in a combined state of the first member and the second member A core outer surface is formed by the outer surface of each member, and a core hollow portion is formed by the inner surface of each member, and is provided in an outer contact portion that contacts the outer surface of each member, and in the core hollow portion, A cam shaft that supports the first member from the inside so that the outer surface of the first member is in contact with the outer contact portion, and the cam shaft is rotated to release the support state of the first member. The first cam rotation mechanism and the first cam shaft when the support by the cam shaft is released. The second member is pushed inward by utilizing a gap formed between the first pushing means for pushing the material inward from the outside and the first member by the movement of the first member. Second pushing means.

  According to the first aspect of the invention, the core is composed of the first member and the second member, and the first member is supported from the inside by the cam shaft, so that the outer surface of the second member is also the outer contact portion. The state of contact with each other is maintained, whereby the combined state of the members is maintained. When the support by the camshaft is released when the core is pulled out, the first member is pushed inward and the outer surface thereof is detached from the inner surface of the cast product. Next, the second member is pushed inward, and its outer surface is also removed from the inner surface of the cast product. Since the core contracts in this way and the entire outer periphery thereof is removed from the cast product, the core can be pulled out without being affected by the mold release resistance. For this reason, it is not necessary to provide a draft angle in the core, and an actuator for applying a strong pulling force is not required, so that the mold apparatus can be made compact.

  In addition, according to the first aspect of the present invention, the support of the first member can be released and the core can be contracted simply by rotating the cam shaft provided in the hollow portion of the core. And each pushing means which pushes in the 1st member and the 2nd member is pushed inward from the outside of each of these members. With such a configuration, when the core is contracted, the internal configuration is simplified, so that the core can be reduced in diameter.

  In the second invention, the core is disposed so as to penetrate the casting space, and the first pushing means and the second pushing means are provided on both sides of the casting space.

  According to the second aspect, since the first pushing means and the second pushing means are provided on both sides of the casting space, each member is pushed on both sides. Thereby, since pressing of each member can be performed equally on both sides, the outer surface of each member can be reliably removed from the inner surface of the cast product.

  In a third invention, provided with a pair of moving bodies provided on both sides sandwiching the casting space and moving along the direction in which the casting space extends, the first pushing means and the second pushing means, Both are provided on the outer surface of each member, and are respectively provided on the pressing taper portion that is inclined outward from the outer surface, and the pair of moving bodies, and the pressing taper portion of the first member, A pressing engagement portion that is engageable with the pressing taper portion of the second member.

  According to the third aspect of the present invention, when the pair of moving bodies are moved, the pushing engaging portions that engage with the pushing tapered portions of the respective members are moved accordingly. Since each member constituting the core is in a state where the outer surface is bonded to the inner surface of the cast product, the pressing engagement portion moves relative to the pressing taper portion of each member, and the engagement action of both of them moves. Each member is pushed inward. Thereby, it is not necessary to provide an actuator for pressing the outer surface of each of the plurality of members, which can contribute to downsizing of the apparatus.

  According to a fourth aspect of the present invention, the pushing taper portion of the first member and the pushing taper portion of the second member are provided with their positions shifted in the central axis direction of the core, and the pushing engaging portion is An annular engaging portion for pushing provided in the entire circumferential direction of the core is formed, and the annular engaging portion for pushing is sequentially engaged with each of the pushing tapered portions by the movement of the moving body.

  According to the fourth aspect of the present invention, the annular engaging portion for pushing is sequentially engaged with each pushing tapered portion, and the first member is pushed first, and then the second member is pushed. Accordingly, it is not necessary to provide a pressing engagement portion corresponding to the pressing taper portion for each member, and the configuration can be simplified.

  In the fifth invention, the pushing taper portion is inclined toward the both ends of each member, and one of the pair of moving bodies is relatively moved within a range in which one end portion of the core is not detached. A first movable body that is detachably attached, and the other is a second movable body that holds the other end of the core in a mold-closed state and releases it from the held state, and the first movable body And a moving mechanism for moving the second moving body in a direction away from each other in conjunction with the mold opening.

  According to the fifth aspect of the present invention, when the first moving body and the second moving body move in conjunction with the mold opening, the pushing engagement portions are moved at the both ends of the core as the moving bodies move. Relative movement with respect to the pushing taper portion causes the members to be pushed inward by the engaging action of the both, and the core contracts. As described above, since the contraction of the core can be performed in conjunction with the mold opening operation, a separate operation for contracting the core is not required, and an increase in the number of processes can be suppressed.

  In a sixth aspect of the invention, the moving mechanism moves the both moving bodies after the support of the first member is released by the rotation of the cam shaft.

  According to the sixth aspect of the present invention, the pushing of the first member accompanying the movement of the moving body is not performed in conjunction with the release of support by the camshaft, but is performed in a state in which the support is released in advance. It is possible to suppress the occurrence of inconveniences due to the rotation of the shaft.

  In a seventh aspect of the invention, the moving mechanism includes an inclined pin provided on a fixed side when the mold is opened, and a moving guide hole provided in each moving body and into which the inclined pin is inserted, and the inclined pin, A gap is formed between the movable guide hole, and the cam rotation mechanism releases the support of the first member by rotating the cam shaft while the inclined pin moves through the gap. I tried to do it.

  According to the seventh aspect of the present invention, while adopting the existing configuration in which the moving body is moved by the engaging action of the moving guide hole formed in the moving body and the fixed-side inclined pin, the moving start time of the moving body is determined. It is possible to realize a configuration in which the cam shaft is rotated during the shift later.

  In an eighth aspect of the invention, each of the members includes an inclined front portion having an outer surface before being inclined by the pushing taper portion, and an inclined rear portion having an outer surface that is bulged after being inclined, and is configured by the inclined front portion. The first columnar portion and the second columnar portion constituted by the inclined rear portion after pressing have the same cross section, and the first moving body is movably inserted through the first columnar portion and is in contact with the outer side. And a core holding surface that is inserted through the second columnar portion and abuts on the outer peripheral surface thereof after being pushed.

  According to the eighth aspect of the invention, the core holding surface restrains the outer peripheral side of the first columnar portion and allows the core to move relative to the first moving body. Even after each member is pushed in, the core holding surface restrains the outer peripheral side of the second columnar portion and maintains a state in which the core can move relative to the first moving body. Thereby, the core can maintain the state where the members are combined and the state where the core is attached to the first moving body before and after pressing.

  In a ninth aspect of the invention, the moving mechanism is configured to move the pair of moving bodies in a direction approaching each other in conjunction with mold closing, and the first member in the pushed-in state is moved along with the movement. It further has the 1st member expansion means which expands outward by pressing from both sides along a longitudinal direction.

  According to the ninth aspect of the present invention, when the pair of moving bodies are moved back in the direction to move closer to each other in conjunction with the mold closing, the first member is pressed from both sides by the first member spreading means and pushed outward. Can be expanded. Accordingly, the second member is also pushed outward together, and the core contracted by the pushing can be expanded again. As a result, since the core can be expanded in conjunction with the mold opening operation, an additional operation for expanding the core is not required, and an increase in the number of processes can be suppressed.

  In a tenth aspect of the invention, the first member expansion means is provided on both end faces of the first member, and the expansion taper portions that incline from the end faces toward the center of the core, and the pair of Each of the movable bodies is provided with an expansion engaging portion that engages with the expansion taper portion.

  According to the tenth invention, by the return movement of the movable body, the engaging portion for expanding is engaged with the expanding taper portions provided at both ends of the first member, and by the engaging action of both, The first member is pushed outward. In this way, the first member can be smoothly expanded by the expansion using the tapered portion.

  In an eleventh aspect of the invention, there is provided expansion guide means for guiding the expansion of the second member accompanying the expansion of the first member.

  According to the eleventh aspect, since the expansion guide means guides the expansion of the second member accompanying the outward movement of the first member, the expansion of the second member can be performed smoothly.

  In a twelfth aspect of the invention, the cam rotation mechanism includes a rack provided on a fixed side when the mold is opened, and a pinion that is connected to the cam shaft and meshes with the rack, and is interlocked with the mold opening. The camshaft is configured to rotate, and the pinion is disengaged from the engagement with the rack when a predetermined interval is secured between the first member and the camshaft.

  According to the twelfth aspect of the invention, the pinion and the rack are disengaged when a predetermined interval necessary for pushing is ensured, so that the camshaft rotates more than necessary to release the support of the first member. Is not continued. As a result, it is possible to prevent the camshaft from being placed in the support state again by continuing the rotation of the pinion and causing a problem in pushing the first member.

  In a thirteenth aspect of the invention, the camshaft has a flat portion that is parallel to the inner surface of the first member in a state in which the pinion and the rack are disengaged, and toward a support state before release. In the case of reverse rotation, it has a shape that delays rising to the first member side.

  According to the thirteenth aspect, when the first member is pushed in, the inner surface thereof comes into contact with the flat portion of the cam shaft, and the inside of the contracted core can be reliably supported by the contact between the surfaces. Then, when the cam shaft is reversely rotated by the cam rotation mechanism and the expanded core is returned to the state where it is supported from the inside, the rising of the cam shaft is delayed. Do not stand to the side. As a result, in the previous tenth and eleventh aspects, the camshaft is prevented from interfering with the expansion action of the first member due to the engagement between the expansion taper portion and the expansion engagement portion. it can.

  In a fourteenth aspect of the invention, a pair of the first members are provided, and both of them are combined with the inner surfaces forming the core hollow portion facing each other, and the outer surfaces of the first members are in contact with the outer sides. The inner abutting portions of the cam shafts that are in contact with the respective inner surfaces in the state of being in contact with the portions exist on a straight line along the opposing direction of the first members in a cross section perpendicular to the central axis of the cam shaft. To do.

  According to the fourteenth aspect of the present invention, in the cross section orthogonal to the central axis of the camshaft, each inner abutment portion exists on a straight line along the facing direction of the pair of first members, so that In the child, the pair of first members can be more firmly supported by the cam shaft.

Sectional drawing which shows a die-casting apparatus. The top view which shows a die-cast apparatus. The partially expanded view in FIG. Sectional drawing which shows the mode of a mold opening roughly. Sectional drawing which shows the mode of mold closing roughly. Sectional drawing which shows the core in the state by which both ends were hold | maintained (BB cross section of FIG. 7). AA sectional drawing in FIG. The perspective view which shows a core alone. Exploded view of the core. FIG. 7 is an enlarged view of the periphery of the core proximal end holding portion in FIG. 6. Rear view of the core. The disassembled perspective view of a 1st slider and a core. The enlarged view of a cam shaft periphery part. It is explanatory drawing which shows rotation operation | movement of a pinion, (a) shows a mold closed state, (b) shows a mold open state. Explanatory drawing which shows rotation of the cam shaft in mold closing operation. The exploded view of the core in FIG. 6 and a core front-end | tip holding | maintenance part. The front view which shows the elongate columnar part of a core. The side view which shows a part of long columnar part of a core. Explanatory drawing which shows the operation | movement at the time of a mold opening. Sectional drawing which shows operation | movement of a division | segmentation piece (AA cross section of FIG. 19). Explanatory drawing which shows operation | movement at the time of mold closing. Schematic which shows another embodiment. Explanatory drawing which shows another form of a cam shaft.

  Hereinafter, an embodiment of a mold apparatus will be described. In this embodiment, the mold apparatus is embodied as a die casting apparatus, and it is assumed that a cylindrical member made of aluminum is manufactured as a cast product.

  FIG. 1 is a cross-sectional view showing a die casting apparatus, FIG. 2 is a plan view thereof, and FIG. 3 is a partially enlarged view of FIG. As shown in FIG. 1, the die casting apparatus 11 includes a fixed mold 12 and a movable mold 13. By integrally combining the fixed mold 12 and the movable mold 13, a cylindrical cavity C is formed in the casting space 14. FIG. 1 shows a die casting apparatus 11 in a mold closed state in which a fixed mold 12 and a movable mold 13 are combined.

  Hereinafter, the vertical and horizontal directions and the depth are specified based on the state shown in FIG. The vertical direction corresponds to the moving direction of the movable mold 13, and the horizontal direction corresponds to the direction in which the cavity C extends. However, the specification of this arrangement is for convenience of explanation. For example, the die casting apparatus 11 may be arranged so that the moving direction of the movable mold 13 is the horizontal direction.

  First, the configuration of the fixed mold 12 will be described. As shown in FIG. 1, the fixed mold 12 includes a fixed mother mold 21, a fixed side insert 22, and inclined pins 23 and 24.

  The fixed mother die 21 is a block body and is attached to a fixed die attaching portion (not shown) provided in the die casting apparatus 11. The fixed mother die 21 is formed with a receiving groove 25 for nesting, and the fixed side insert 22 is received in the receiving groove 25. A semicircular groove 26 extending along the left-right direction is formed on the mating surface 22 a of the fixed side insert 22.

  The inclined pins 23 and 24 include a first inclined pin 23 and a second inclined pin 24. The first inclined pin 23 is provided on the left side of the fixed side nest 22, and the second inclined pin 24 is provided on the right side of the fixed side nest 22. Both of them protrude downward from the mating surface 21a of the fixed mother die 21 and are inclined so as to form a square shape. Although the first tilt pin 23 and the second tilt pin 24 have different tilt directions, the tilt angles thereof are the same. Further, the protruding length of the second inclined pin 24 is longer than the protruding length of the first inclined pin 23.

  As shown in FIG. 2, a pair of first inclined pins 23 a and 23 b are provided, and are respectively disposed at positions that are symmetric with respect to the central axis K of the casting space 14 in a plan view. On the other hand, the second inclined pin 24 is one and is disposed on the central axis K.

  Next, the configuration of the movable mold 13 will be described. As shown in FIG. 1, the movable mold 13 includes a movable mold 31, a movable side insert 32, sliders 33 and 34, a core pulling mechanism 35, and a product pushing mechanism 36.

  The movable mother die 31 is a block body and is attached to a movable attachment portion (not shown) provided in the die casting apparatus 11. The movable base 31 can be moved in the vertical direction by driving the movable mounting portion, and the mold opening operation is performed by moving in the downward direction. After the mold is opened, the mold is closed again by moving upward again.

  The movable mother die 31 is formed with an accommodation groove 37 for nesting, and the accommodation groove 37 accommodates the movable side nesting 32. A semicircular groove 38 extending in the left-right direction is formed on the mating surface 32 a of the movable side insert 32. The mating surface 32a is in contact with the mating surface 22a of the fixed side insert 22, and the semicircular grooves 26, 38 are joined together to form a cylindrical casting space 14.

  The sliders 33 and 34 are composed of a first slider 33 and a second slider 34, and both have upper surfaces serving as mating surfaces 33 a and 34 a with the fixed side. The first slider 33 is provided on the left side of the movable side insert 32, and its right end surface is in contact with the movable side insert 32 and the fixed side insert 22. The second slider 34 is provided on the right side of the movable side nest 32. As shown in FIG. 2, both sliders 33 and 34 are disposed on the central axis K in plan view. A movable guide groove 39 is formed in the movable mother die 31 along the central axis K, and both sliders 33 and 34 are accommodated in the movable guide groove 39 (see FIG. 7 described later). By this accommodation, both the sliders 33 and 34 are prevented from coming off upward, and can be moved in the left-right direction along the movement guide groove 39.

  Returning to FIG. 1, the first slider 33 is provided with a first movement guide hole 41 and a core 42. The first inclined pin 23 on the fixed side is inserted into the first movement guide hole 41. The first movement guide hole 41 is provided corresponding to each of the pair of first inclined pins 23 (see FIG. 2), and is inclined in parallel with the inclination direction of the first inclined pins 23. The depth of the first movement guide hole 41 is substantially the same as the protruding length of the first inclined pin 23, and the hole cross section is formed larger than the first inclined pin 23 over the entire region in the hole forming direction. All the protruding portions of the first inclined pin 23 are inserted into the first movement guide hole 41, and as shown in the enlarged view of FIG. On the outer side (left side), a gap X1 is formed between the inner surface of the hole. As a result, a movement allowance X2 that allows the first inclined pin 23 to move exists in the first movement guide hole 41.

  The core 42 forms a cavity C in the casting space 14 formed by the contact between the inserts 22 and 32. The core 42 has a columnar core portion 43 that extends in the left-right direction toward the second slider 34 and is disposed in the casting space 14. The columnar core portion 43 has a columnar shape with a diameter smaller than the hollow cross section of the casting space 14 and is longer than the casting space 14. As shown in FIG. 2, the columnar core portion 43 is disposed so as to be coaxial with the central axis K, whereby a cylindrical cavity C is formed in the casting space 14.

  A pouring gate 15 (see FIG. 2) for casting molten aluminum into the cavity C and a molten metal flow passage (casting passage and runner) connected from the pouring port 15 to the cavity C are formed in the block. Further, an overflow portion for receiving the molten metal overflowing from the cavity C, a medium flow path for a cooling medium for promoting solidification of the cast molten metal, and the like are also formed.

  The second slider 34 is provided with a second movement guide hole 44 into which the second inclined pin 24 is inserted. The second movement guide hole 44 vertically penetrates the second slider 34 and is inclined in parallel with the inclination direction of the second inclination pin 24. The hole cross section of the second movement guide hole 44 is formed larger than the second inclined pin 24 over the entire region in the hole forming direction. A protruding portion of the second inclined pin 24 is inserted into the second movement guide hole 44, and the protruding end slightly protrudes from the lower end opening. On the slide surface on which the second slider 34 is slid, a groove 45 for receiving a portion protruding from the lower end opening is formed.

  As shown in the enlarged view of FIG. 3B, the second inclined pin 24 contacts the inner surface of the hole on the inner side (left side), while the second inclined pin 24 is between the inner surface of the hole on the opposite outer side (right side). A gap X3 having the same dimensions as the gap X1 on the one inclined pin 23 side is formed. Therefore, here again, the movement allowance X4 enabling the movement of the second inclined pin 24 exists in the second movement guide hole 44 with the same dimension as the movement allowance X2 in the first movement guide hole 41. Yes.

  The core extraction mechanism 35 is an apparatus that extracts the columnar core portion 43 from the casting space 14 when the mold is opened. The core pulling mechanism 35 has a pulling drive device such as a hydraulic cylinder device, and the head portion 35 a is arranged on the left side of the first slider 33 with a predetermined interval. The head portion 35a and the first slider 33 are connected by a connecting mechanism (not shown). As will be described later, when the first slider 33 moves to the left when the mold is opened, the head portion 35a contacts the head portion 35a, and both are integrated. The When the extraction driving device is driven in the integrated state, the first slider 33 moves further to the left together with the head portion 35a, whereby the columnar core portion 43 is extracted from the casting space 14.

  The product extrusion mechanism 36 is a device that extrudes the cast product after the mold is opened and takes it out of the movable mold 13. The product extrusion mechanism 36 is attached to the lower side of the movable mother die 31 (the side opposite to the fixed mold 12). The product extruding mechanism 36 has a plurality of extruding pins 47 (only part of which are shown in the figure) provided on an extruding plate 46 that moves up and down. Existing castings are extruded. On the other hand, the return pin 48 (only a part of the illustration) plays a role of returning the pushed-up pusher plate 46 to its original position and guiding the pusher plate 46 to move up and down.

  Here, the operation of each part during mold opening and mold closing will be confirmed for the time being. FIG. 4 is a sectional view schematically showing a state of mold opening, and FIG. 5 is a cross-sectional view schematically showing a state of mold closing.

  Explaining from the mold opening, as described above, both the first movement guide hole 41 and the second movement guide hole 44 provided in the sliders 33 and 34 are between the inclined pins 23 and 24 inserted therein. Are provided with movement allowances X2 and X4 (see FIG. 3). For this reason, as shown in FIG. 4 (a), when the movable mold 13 is moved downward, the inclined pins 23 and 24 are moved to the initial positions when the distance D1 becomes the same as the movement allowances X2 and X4. It abuts against the inner surface of the hole on the side opposite to the contact point. Meanwhile, since the inclined pins 23 and 24 only move within the movement guide holes 41 and 44, neither slider 33 or 34 moves.

  When the movable mold 13 is further moved downward, the first inclined pin 23 in the fixed state is in contact with the inner surface of the first movement guide hole 41 on the outer side of the inclination. The slider 33 is moved outward (leftward) of the pin inclination. As the first slider 33 moves, the core 42 is detached from the inner surface of the cast product S, and subsequently, the core 42 is gradually pulled out from the cast product S. Further, since the second inclined pin 24, which is also in a fixed state, is in contact with the inner surface of the second moving guide hole 44 on the outer side of the inclination, the second slider 34 is moved outwardly of the pin inclination by the engaging action of both of them. Moved to the right. In this case, since the first tilt pin 23 and the second tilt pin 24 have the same tilt angle, both sliders 33 and 34 move in a direction away from each other while being synchronized.

  As shown in FIG. 4B, when the distance between the movable molds 13 becomes D2, the first inclined pin 23 comes out of the first movement guide hole 41. For this reason, the movement of the first slider 33 due to the engaging action of the first inclined pin 23 and the first movement guide hole 41 stops. At this time, the first slider 33 is integrated with the head portion 35a of the core pulling mechanism 35 at the left end thereof.

  When the movable mold 13 is further moved downward, the engagement between the second inclined pin 24 and the second movement guide hole 44 is continued, so that the second slider 34 is further moved to the right. And as shown in FIG.4 (c), when it becomes the separation distance D3, the 2nd inclination pin 24 will come out from the 2nd movement guide hole 44. As shown in FIG. For this reason, the movement of the second slider 34 due to the engaging action of the second inclined pin 24 and the second movement guide hole 44 stops. In this state, the columnar core portion 43 of the core 42 provided on the first slider 33 is still disposed in the cast product S, and the extraction of the core 42 has not yet been completed.

  Thereafter, the movable mold 13 is moved down to the moving end, and the core pulling mechanism 35 is driven to move the first slider 33 integrated with the head portion 35a to the left. Thereby, the columnar core part 43 of the core 42 is completely extracted from the cast product S. If the product pushing mechanism 36 is driven after the drawing, the cast product S can be taken out from the movable side insert 32.

  Next, the mold closing will be described. First, the core pulling mechanism 35 and the product pushing mechanism 36 are returned to their original states. The positions of the first slider 33 and the second slider 34 in this state are as shown in FIG. 4C described above, and the core 42 is inserted into the semicircular groove 38 of the movable side insert 32. Then, when the movable mold 13 is moved upward, the second inclined pin 24 is inserted into the second movement guide hole 44, and when the separation distance D4 is reached as shown in FIG. The second inclined pin 24 abuts on the inner side of the inclination.

  When the movable mold 13 is further moved upward, the inner surface of the second moving guide hole 44 is in contact with the inclined inner side of the second inclined pin 24 in the fixed state. 2 The slider 34 is moved inward (leftward) of the pin inclination. Then, as shown in FIG. 5B, when the separation distance D <b> 5 is reached, the first inclined pin 23 is inserted into the first movement guide hole 41, and the inner surface of the hole contacts the inclined inner side of the first inclined pin 23. Until then, only the second slider 34 moves, and the first slider 33 does not move.

  When the movable mold 13 is moved up from there, the movement of the second slider 34 continues as described above, and the hole of the first movement guide hole 41 with respect to the inclined inner side of the first inclined pin 23 in the fixed state. Since the inner surfaces are in contact with each other, the first slider 33 is also moved inwardly (rightward) of the pin inclination by the engaging action of both of them. As a result, the sliders 33 and 34 move toward each other in synchronism with each other through the state of the separation distance D6 shown in FIG. 5C until the mold is closed from the separation distance D5. The insertion of the core 42 further proceeds with the movement of the first slider 33, and the arrangement of the core 42 is also completed when the mold is closed.

  As described above, in this embodiment, the first slider 33 corresponds to the first moving body, the second slider 34 corresponds to the second moving body, and the inclined pins 23 and 24 and the moving guide holes 41 and 44 A moving mechanism is configured to move the moving body in conjunction with mold opening and closing.

  By the way, in this die-casting device 11, when the core 42 is pulled out from the cast product S with the movement of the first slider 33, a structure in which the draft angle of the columnar core portion 43 is unnecessary and the drawing is easy is adopted. Has been. This will be described below.

  As shown in FIG. 1, the core 42 includes a long columnar portion 51 having the columnar core portion 43 and a flange portion 52 provided at one end thereof. In this core 42, the side (left side) where the flange portion 52 exists is the base end side, and the opposite side (right side) is the front end side. The flange portion 52 is housed in the housing space 53 of the first slider 33, and the long columnar portion 51 is held by a core base end holding portion 54 that is inserted through the base end portion. The long columnar portion 51 extends in the left-right direction beyond the right end of the casting space 14, and the tip portion that penetrates the casting space 14 is held by the core tip holding portion 55 of the second slider 34. ing.

  FIG. 6 is a cross-sectional view showing the core 42 in a state where both ends are held in the mold closed state. 7 is a cross-sectional view taken along the line AA in FIG. 6, and the cross-sectional view taken along the line BB in FIG. 7 corresponds to FIG. As shown in FIG. 7, the BB cross section is a cut surface that is bent at 90 degrees, and in FIG. 6, the lower half of the center line is different from the cross section shown in FIG. FIG. 8 is a perspective view showing the core 42 as a single unit, and the overall image of the core 42 can be grasped by this illustration. A more detailed configuration of the core 42, the first slider 33 provided with the core 42, and the second slider 34 that holds the tip of the core 42 will be described with reference to these drawings.

  First, the basic configuration of the core 42 is first confirmed.

  As shown in FIGS. 7 and 8, the core 42 is configured as a split core, and a total of four split pieces, that is, a pair of first split pieces 61 and a pair of second split pieces 71 are combined. The 1st division piece 61 as a 1st member has the 1st elongate part 62 which makes long shape, and the 1st flange block 63 provided in the one end part. Moreover, the 2nd division piece 71 as a 2nd member also has the 2nd elongate part 72 which makes long shape, and the 2nd flange block 73 provided in the one end part. The long columnar part 51 is formed by combining the first long part 62 and the second long part 72.

  FIG. 9 is an exploded view showing a state where the second elongated portion 72 is separated. As shown in FIG. 9, the cross section of the 1st elongate part 62 has comprised substantially trapezoid shape, and the lower bottom side is formed in planar shape in the arc-shaped surface 64 from which an upper bottom side becomes a circular arc. A pair of 1st division | segmentation piece 61 is arrange | positioned so as to oppose up and down so that each arc-shaped surface 64 may face outward at predetermined intervals. Hereinafter, the arcuate surface 64 is referred to as an arcuate outer surface 64, and the opposite flat bottom side plane is referred to as an inner plane 65. On the other hand, the cross-section of the second elongated portion 72 has a substantially crescent shape, and the back surface of the arcuate surface 74 has a back surface in the shape of a dogleg. A pair of 2nd division | segmentation piece 71 is arrange | positioned so that each arcuate surface 74 may face outward. Hereinafter, the arcuate surface 74 is referred to as an arcuate outer surface 74, and the opposite back surfaces are referred to as inner surfaces 75. The side surface 66 of the first elongate portion 62 and the inner side surface 75 of the second elongate portion 72 are brought into contact with each other, and the core hollow portion 56 is formed in the long columnar portion 51 over the entire extending direction. Is formed.

  As shown in FIGS. 7 and 8, the first flange block 63 is provided so as to protrude outward from the arcuate outer surface 64 along the trapezoidal height direction. The second flange block 73 is provided so as to project outward from the arcuate outer surface 74 along a direction that bisects a crescent-shaped cross section. Due to the combination of the divided pieces 61 and 71, the pair of first flange blocks 63 and the pair of second flange blocks 73 are arranged in a cross shape on the proximal end side of the long columnar portion 51. A flange portion 52 is formed. The back surface of the flange part 52 is the same plane.

  The core 42 will be further described. As shown in FIGS. 6 and 8, the first elongated portion 62 includes a first base portion 62a existing on the proximal end side and a first main body portion 62b existing on the distal end side. And have two parts. The first main portion 62b is longer than the first base portion 62a in the direction in which the core 42 extends, and the trapezoidal height of the cross section is formed so that the first base portion 62a is higher than the first main portion 62b. Therefore, a step is generated between the arcuate outer surface 64a of the first base portion 62a and the arcuate outer surface 64b of the first main body portion 62b, and the stepped portion becomes a first rear taper portion 67 as a pushing taper portion. The first base portion 62a corresponds to the inclined rear portion, and the first main body portion 62b corresponds to the inclined front portion.

  The second elongate portion 72 has two parts, a second base portion 72a existing on the proximal end side and a second main body portion 72b existing on the distal end side. As shown in FIG. 9, the second main body 72b is formed such that its arcuate outer surface 74b is an arc. Further, in the second base portion 72a, the arc-shaped outer surface 74a is an arc in which the arc of the second main body portion 72b is slightly bulged by the dimension Y1 on the bisector of the crescent-shaped cross section (the line included in the cut surface in FIG. 7). It is formed to become. Thus, a thin crescent-shaped step is formed between the arc-shaped outer surface 74a of the second base portion 72a and the arc-shaped outer surface 74b of the second main body portion 72b, and the step portion is a second rear portion as a pressing taper portion. A tapered portion 77 is formed (see also FIG. 8). The second base portion 72a corresponds to the inclined rear portion, and the second main body portion 22b corresponds to the inclined front portion.

  FIG. 10 is an enlarged view in which the periphery of the core proximal end holding portion 54 in FIG. 6 is enlarged. As shown by the reference line L1 in FIG. 10, the combined length of the first main body portion 62b and the first rear taper portion 67 is equal to the length of the second main body portion 72b in the cut surface. For this reason, the second rear taper portion 77 is disposed on the base end side with respect to the first rear taper portion 67 and starts to be inclined from the rear end (the front end of the first base portion 62a) of the first rear taper portion 67. Further, as shown in FIG. 7, since the first main body portion 62b and the second main body portion 72b are both arc-shaped outer surfaces 64b and 74b, the columnar portion formed by them is a circle whose cross section is a perfect circle. It becomes a columnar part. This cylindrical portion corresponds to the first columnar portion. Incidentally, as shown in FIGS. 6 and 8, a part of the columnar portion becomes a columnar core portion 43 disposed in the casting space 14.

  FIG. 11 is a rear view of the core 42. As shown in FIG. 11, a first back recess 68 is formed on the back of the first flange block 63, and a second back recess 78 is formed on the back of the second flange block 73. Both are fan-shaped, and arc-shaped tapered inner surfaces 69 and 79 are formed on the inner surface. The rear concave portions 68 and 78 are combined to form a proximal circular concave portion 57 on the rear surface of the flange portion 52.

  Next, the first slider 33 provided with the core 42 will be described. As shown in FIG. 6, the first slider 33 is formed by combining a first component member 81 and a second component member 82. The housing space 53 for housing the flange portion 52 of the core 42 is formed by a flange housing recess 83 formed on the combination surface 81 a of the first component member 81 and a combination surface 82 a of the second component member 82.

  FIG. 12 is an exploded perspective view of the first slider 33 and the core 42. As shown in FIG. 12, the flange accommodating recess 83 has four individual recesses 83a to 83d. In each of the individual recesses 83a to 83d, flange blocks 63 and 73 in the divided pieces 61 and 71 of the core 42 are provided. Each is housed. Each of the individual recesses 83a to 83d is formed deeper than the thickness of the flange blocks 63 and 73. For this reason, the flange part 52 accommodated in the accommodation space 53 can move along the depth direction of the individual recesses 83a to 83d (the direction in which the elongated columnar part 51 extends), whereby the core 42 is moved to the first slider. It becomes possible to move relative to 33. However, as shown in FIG. 6, in the mold closed state, the state in which the back surface of the core 42 is in contact with the back surface of the accommodation space 53 (that is, the combination surface 82 a of the second component member 82) is maintained.

  As shown in FIG. 12, the combination surface 82a of the second component member 82 is provided with a proximal-side raised portion 84 having a circular shape when viewed from the front. The proximal-side raised portion 84 is provided at a position corresponding to the central portion of the flange accommodating recess 83 and is accommodated in the flange accommodating recess 83 when combined with the first component member 81. An outer peripheral portion of the proximal end raised portion 84 is an annular tapered portion 85. The proximal-side raised portion 84 is accommodated in the proximal-end circular recess 57 of the core 42, and as shown in FIG. 6, the annular tapered portion 85 abuts against the tapered inner surfaces 69, 79 on the rear surfaces of the flange blocks 63, 73. ing.

  Returning to FIG. 12, the core base end holding portion 54 that holds the base end side of the long columnar portion 51 is provided on the opposite surface of the combination surface 81 a in the first component member 81, and the core insertion hole 86 has a long length. The columnar part 51 is inserted. The core insertion hole 86 has a large-diameter hole portion 86a extending from the proximal end side of the core proximal-end holding portion 54 to the flange accommodating recess 83, and a small diameter that exists on the distal end side of the large-diameter hole portion 86a and opens to the outside. And a hole 86b. The large-diameter hole portion 86a has the same diameter as a circle formed by a part of the arc-shaped outer surface 64a of the first base portion 62a, and the small-diameter hole portion 86b is a combination of the first main body portion 62b and the second main body portion 72b. It has the same diameter as the cylindrical part. A tapered hole portion 86c as a pressing engagement portion and a pressing annular engagement portion is formed at a step portion between the large diameter hole portion 86a and the small diameter hole portion 86b.

  As shown in FIG. 10, in the long columnar portion 51 of the core 42, the cylindrical portion formed by the combination of the first main body portion 62 b and the second main body portion 72 b has a base end side outer peripheral surface having a small diameter hole portion. It contacts the inner surface of 86b (see FIG. 7). For this reason, the small-diameter hole 86b is an outer abutting portion and also a core holding surface. The arcuate outer surface 64a of the first base portion 62a contacts the inner surface of the large-diameter hole portion 86a, and the first rear taper portion 67 and the taper hole portion 86c face each other with a slight gap therebetween. On the other hand, the arc-shaped outer surface 74a of the second base portion 72a is not in contact with the large-diameter hole portion 86a, and the second rear taper portion 77 is also not in contact with the taper hole portion 86c.

  By the way, the state of the core 42 as described above in the first slider 33 is maintained by the cam shaft 91 provided in the hollow portion 56 of the core as shown in FIG. FIG. 13 is an enlarged view in which a peripheral portion of the cam shaft 91 is enlarged. As shown in FIG. 13, the cam shaft 91 has a substantially rhombus shape with a chamfered cross section, and includes a pair of parallel surfaces (referred to as a first parallel surface 91a) and another pair of parallel surfaces (second parallel surfaces). 91b). The cam shaft 91 is provided in the entire region along the direction in which the core hollow portion 56 extends (see FIG. 6).

  The cam shaft 91 is provided in a state where the first parallel surface 91a stands and the major axis direction is inclined. Due to the inclination, the cam shaft 91 is in contact with the inner flat surface 65 of each first divided piece 61. Accordingly, the cam shaft 91 has an inner support point 92, and the inner support point 92 supports the first divided pieces 61 from the inner side so as to push them outward in the opposing direction. . Accordingly, the second elongated portions 72 of the second divided pieces 71 are also pushed outward in the opposing direction. For this reason, as shown in FIG. 7, the outer peripheral surface of the columnar portion formed by the arc-shaped outer surface 64b and the arc-shaped outer surface 74b is pressed against the small-diameter hole portion 86b, and the arc-shaped outer surface 64a is pressed against the inner surface of the large-diameter hole portion 86a. Accordingly, the core 42 is provided on the first slider 33 while maintaining the state where the divided pieces 61 and 71 are combined.

  Here, the cam shaft 91 is rotatably provided in the first slider 33, and the above-described core support state is released by the rotation. As shown in FIG. 6, a rotating shaft 93 is provided at the base end of the cam shaft 91 so as to be coaxial, and is inserted into a shaft hole 87 provided in the second component member 82. The shaft hole 87 is opened at the center of the proximal end raised portion 84 (see FIG. 12). A pinion 94 is attached to the rotation shaft 93, and the rotation shaft 93 and the cam shaft 91 are rotated by the rotation of the pinion 94.

  As a configuration for rotating the pinion 94, the second component member 82 is provided with a rack accommodation hole 88 that opens at the mating surface 33a of the first slider 33 and extends in a direction orthogonal to the rotation shaft 93 (FIG. 12). reference). As shown in FIG. 1, a rack 95 provided in the fixed mother die 21 is accommodated in the rack accommodation hole 88 and meshed with the pinion 94. For this reason, the pinion 94 rotates as the movable mold 13 moves by mold opening. Therefore, the cam rotation mechanism is constituted by the rotation shaft 93, the pinion 94 and the rack 95. Note that the rack accommodating hole 88 is formed as a long hole along the moving direction of the first slider 33 so that the movement of the first slider 33 and the rack 95 do not interfere when the movable mold 13 moves.

  14A and 14B are explanatory views showing the rotation operation of the pinion 94, where FIG. 14A shows the mold closed state and FIG. 14B shows the mold open state. As shown in FIG. 14A, the pinion 94 is engaged with the rack 95 in the mold closed state. A biasing force F is applied to the pinion 94 by a spring member or the like in the rotational direction when the mold is opened, and the meshing state is maintained by the biasing force F.

  From this state, the pinion 94 rotates while the distance D1 of the movable mold 13 is reached at the beginning of mold opening (see FIG. 4A). During the movement of the movable mold 13 during this period, as described above, the first slider 33 does not move. Then, when the movable mold 13 moves to the separation distance D1, the pinion 94 rotates 90 degrees as shown in FIG. 14B and disengages from the rack 95. In this case, the biased pinion 94 is restricted from further rotation by the engagement protrusion 94 a coming into contact with the rotation restricting surface 96 in the second component member 82. For this reason, while the engagement is disengaged, the state where the pinion 94 is rotated 90 degrees is maintained.

  In FIG. 13, the cam shaft 91 rotated 90 degrees is shown by a two-dot chain line. As the pinion 94 rotates, the cam shaft 91 rotates 90 degrees to change the first parallel surface 91a from a standing state to a horizontal state. In this state, the support of the cam shaft 91 with respect to the first divided piece 61 is released, and a gap Z1 is formed between the inner flat surface 65 of the first divided piece 61 and the first parallel surface 91a. The gap Z1 corresponds to a step height Z2 between the first main body portion 62b and the first base portion 62a, and is a predetermined interval necessary for pressing the first divided piece 61. Then, the first divided piece 61 can be moved inward by the gap Z1.

  Returning to FIG. 14, in the mold closing operation, the pinion 94 meshes with the rack 95 as shown in (b) when the distance between the movable molds 13 becomes D6 as the final stage. When the movable mold 13 is further moved from there, the pinion 94 rotates against the biasing force F in the direction opposite to the previous rotation direction. When the mating surfaces 21a and 22a of the fixed mold 12 and the movable mold 13 come into contact with each other and the mold closing is completed, the pinion 94 returns to the original state as shown in FIG. By this return, the camshaft 91 is in the core support state in which the first divided piece 61 is supported by the inner support point 92, and the combined state of the core 42 is held again.

  FIG. 15 is an explanatory view showing the rotation of the cam shaft 91 in the mold closing operation, and shows the state of rotation in the order of (a) to (e). As shown in FIG. 15, in the state (a) in which the camshaft 91 is rotated 90 degrees by mold opening, the first parallel surface 91a is in a horizontal state. From the state (a), even if the cam shaft 91 rotates backward about the central axis R due to the rotation of the pinion 94 engaged with the rack 95, the state (c) is reached via the state (b). The upper and lower end positions are not changed until the two parallel surfaces 91b are in a horizontal state. When the cam shaft 91 further reversely rotates from there, the upper and lower end positions gradually move toward the inner flat surface 65 side. Upon completion of mold closing shown in FIG. Will be supported from the inside.

  Next, a configuration related to holding the tip end portion of the core 42 by the second slider 34 will be described. FIG. 16 is an exploded view of the core 42 and the core tip holding portion 55 in FIG. FIG. 17 is a front view of the long columnar portion 51 of the core 42, and FIG. 18 is a side view showing a part of the long columnar portion 51.

  As shown in FIG. 17, the first elongated portion 62 of the first divided piece 61 continues to have a substantially trapezoidal shape in which the upper bottom side forms an arc shape until the cross-sectional shape reaches the most distal portion. . And as shown in FIG. 16, the 1st front-end | tip recessed part 101 and the 1st front-end | tip protrusion 102 are formed in the front-end | tip part of the 1st elongate part 62. As shown in FIG. The arcuate projecting surface 102a of the first tip projecting portion 102 is lower than the arcuate outer surface 64b of the first main body portion 62b. The first tip protrusion 102 is provided at the foremost portion of the first elongated portion 62, and the portion from the arcuate protrusion 102 a to the tip surface 103 is chamfered to form a first front taper portion 104. In the cut surface of FIG. 16, the first front taper portion 104 is formed to have the same dimensions as the first rear taper portion 67 (refer to FIG. 8 for the above).

  A first front taper portion 105 as a pressing taper portion is formed at a step portion between the arc-shaped concave surface 101a of the first tip recess 101 and the arc-shaped projection surface 102a of the first tip protrusion 102. As shown in FIG. 18, the first front taper portion 105 is bilaterally symmetric with the first front taper portion 104, and the first rear taper portion 67 is also bilaterally symmetric in the cut surface of FIG. 16.

  Returning to FIG. 17, the second elongated portion 72 in the second divided piece 71 also has a substantially crescent shape in cross section until reaching the most advanced portion. And as shown in FIG. 16, the 2nd front-end | tip recessed part 111 and the 2nd front-end | tip protrusion 112 are formed in the front-end | tip part of the 2nd elongate part 72. As shown in FIG. The arcuate projecting surface 112a of the second tip projecting portion 112 is lower than the arcuate outer surface 74b of the second main body portion 72b. The second tip protrusion 112 is provided at the foremost portion of the second elongated portion 72, and the portion from the arcuate protrusion 112 a to the tip surface 113 is chamfered to form a second front taper portion 114. In the cut surface of FIG. 16, the second front taper portion 114 is formed to have the same dimensions as the second rear taper portion 77 (refer to FIG. 8 for the above).

  A second front taper portion 115 as a pressing taper portion is formed at a step portion between the arc-shaped concave surface 111 a of the second tip recess 111 and the arc-shaped projection surface 112 a of the second tip protrusion 112. The second front taper portion 115 on the cut surface in FIG. 16 is symmetrical with both the second front taper portion 114 and the second rear taper portion 77. For this reason, in FIG. 17, the outer peripheral edge 113 a of the tip surface 113 coincides with the arcuate concave surface 111 a of the second tip recess 111. Therefore, the second front taper portion 115 will be further described using the outer peripheral edge 113a.

  In the 2nd front-end | tip recessed part 111, the arc-shaped concave surface 111a (outer peripheral edge 113a of the front end surface 113) is formed so that it may become a circular arc. The second tip protrusion 112 is formed such that the arc-shaped protruding surface 112a is an arc slightly bulged by a dimension Y2 from the arc of the arc-shaped concave surface 111a. The bulge amount Y2 is the same as the bulge amount Y1 of the second base portion 72a. For this reason, as shown in FIG. 18, a thin crescent-shaped step is formed between the arc-shaped concave surface 111a of the second tip recess 111 and the arc-shaped projection 112a of the second tip protrusion 112, and the step portion Is a second front taper portion 115. The second front taper portion 115 is bilaterally symmetric with the second front taper portion 114, and is also bilaterally symmetric with the second rear taper portion 77 in the cut surface of FIG.

  The first tip concave portion 101 and the second tip concave portion 111 are provided at the same position in the extending direction of the long columnar portion 51, and as shown in FIG. 18, the arc-shaped concave surface 101a and the second tip of the first tip concave portion 101 are provided. An annular groove 58 is formed by combining with the arcuate concave surface 111a of the recess 111. As shown in FIG. 16 using the reference line L2 as an index, the combined length of the first tip recess 101 and the first front taper 105 is equal to the length of the second tip recess 111 on the cut surface. . For this reason, the second front taper portion 115 is disposed on the front end side with respect to the first front taper portion 105 and starts to tilt from the front end of the first front taper portion 105.

  A first chamfered portion 106 is formed inside the distal end of the first elongated portion 62, and a second chamfered portion 116 is formed inside the distal end of the second elongated portion 72. As shown in FIG. 17, these chamfered portions 106, 116 are combined to form a circular tip circular recess 59 on the tip surface of the core 42. Incidentally, a tip protrusion 97 having a circular cross section is provided at the tip of the cam shaft 91 (see FIG. 12).

  Subsequently, the core tip holding portion 55 provided on the second slider 34 and holding the tip portion of the core 42 will be described. As shown in FIG. 16, the core tip holding portion 55 has a tip receiving recess 121 that receives the tip of the long columnar portion 51. The distal end accommodating recess 121 is formed on a facing surface facing the distal end surface of the long columnar portion 51 (the distal end surfaces 103 and 113 of the divided pieces 61 and 71), and the opening cross section has a circular shape corresponding to the annular groove 58. There is no. The peripheral edge portion of the tip receiving recess 121 is in contact with the side surface portion of the annular groove portion 58, and the opening inner surface 121 a is in contact with the peripheral surfaces of the annular groove portion 58 (the arc-shaped concave surface 101 a and the arc-shaped concave surface 111 a).

  An accommodation space 122 having a circular cross section and a recess bottom surface 123 are provided at the back of the opening of the tip receiving recess 121. The inner surface forming the accommodation space 122 has an annular first inner taper portion 124 facing the first front taper portion 105 with a slight gap, and an annular second inner portion that abuts the front taper portions 104 and 114. A tapered portion 125 is formed. The gap between the first front taper portion 105 and the first inner taper portion 124 is the same as the gap between the first rear taper portion 67 and the taper hole portion 86 c of the core insertion hole 86. The second front taper portion 115 disposed on the front end side of the first front taper portion 105 is in a non-contact state with the first inner taper portion 124. The first inner taper portion 124 corresponds to a pressing engagement portion and a pressing annular engagement portion.

  The concave bottom surface 123 is provided with a tip-side raised portion 126 having a circular cross section at the center thereof, and is accommodated in the circular tip concave portion 59 of the core 42. An annular taper portion 127 is formed on the outer peripheral portion of the distal end side raised portion 126, and the annular taper portion 127 is in contact with the chamfered portions 106 and 116 of the divided pieces 61 and 71. A protrusion accommodating recess 128 that accommodates the distal protrusion 97 of the cam shaft 91 is formed at the center of the distal protrusion 126.

  Here, as described above, the core 42, the inner surface of the accommodation space 53 in the first slider 33, the core proximal end holding portion 54, and the core distal end holding portion 55 in the second slider 34 each have a plurality of tapers. A shaped part is formed. That is, with respect to the core 42, the flange portion 52 has a tapered inner surface 69 (see FIG. 11). Similarly, in the long columnar portion 51 of the core 42, the first rear taper portion 67, the second rear taper portion 77, the first front taper portion 105, the second front taper portion 115, the first chamfered portion 106 and the second chamfered portion. 116 (see FIGS. 6 and 16). The first slider 33 has an annular tapered portion 85 of the proximal end side raised portion 84 and a tapered hole portion 86c in the core insertion hole 86 (see FIGS. 6 and 10). The core tip holding portion 55 of the second slider 34 has a first inner taper portion 124 and an annular taper portion 127 of the tip side raised portion 126 (see FIG. 16). Each of these tapered portions has the same inclination angle.

  Next, the operation of the core 42 accompanying the movement of the first slider 33 and the second slider 34 during mold opening and mold closing will be described. FIG. 19 is an explanatory view showing the operation when the mold is opened, and FIG. 20 is a cross-sectional view showing the operation of the divided pieces. 19 shows a cut surface that is bent at 90 degrees as in FIG. 6, and FIG. 20 shows the same cross section as FIG. 7 (AA cross section in FIG. 19). 20A shows a cross section in FIG. 19A, and FIG. 20B shows a cross section in FIG. 19B. FIG. 21 is an explanatory view showing the operation when the mold is closed.

  When the mold is opened, as described above, when the distance between the movable molds 13 is D1 (see FIG. 4A), the support by the cam shaft 91 is released by turning the cam shaft 91 by 90 degrees. A gap Z1 is formed between the first divided piece 61 and the cam shaft 91 (see FIG. 13). Assuming this state, when the first slider 33 and the second slider 34 are synchronously moved in the separation direction along with further movement of the movable mold 13, first, the first slider 33 is configured to be in the core proximal end holding portion 54. The tapered hole portion 86 c of the core insertion hole 86 contacts the first rear tapered portion 67. Further, in the second slider 34, the first inner taper portion 124 of the tip receiving recess 121 in the core tip holding portion 55 contacts the first front taper portion 105. This is because there are some gaps between them, and all the gaps have the same interval.

  When the movement of the movable mold 13 is continued and the first slider 33 and the second slider 34 are further moved synchronously, the first divided piece 61 is caused by the engagement action of the tapers on the proximal end side and the distal end side of the core 42. Is moved to the inside using the gap Z1. Accordingly, as shown in FIGS. 19A and 20A, the first divided piece 61 moves until the inner flat surface 65 abuts against the first parallel surface 91 a of the cam shaft 91. By this movement, the arcuate outer surface 64b of the first main body portion 62b is removed from the inner surface of the cast product S, and between the side surface 66 of the first elongated portion 62 and the inner surface 75 of the second elongated portion 72. Is formed with a gap Z3. When the first divided piece 61 contacts the cam shaft 91, the first rear taper portion 67 gets over the taper hole portion 86c, and the first front taper portion 105 gets over the first inner taper portion 124, respectively. Simultaneously with the timing of overcoming, the tapered hole portion 86c contacts the second rear tapered portion 77, and the first inner tapered portion 124 contacts the second front tapered portion 115.

  The second divided piece 71 is still adhered to the inner surface of the cast product S, and the second divided piece 71 remains together with the cast product S even if the first slider 33 moves. For this reason, the second divided piece 71 also moves relative to the first slider 33 together with the first divided piece 61. Due to the relative movement of the two split pieces 61, 71, the proximal-side raised portion 84 in the accommodation space 53 comes out of the proximal-end circular recess 57 of the core 42.

  When the sliders 33 and 34 are further moved synchronously from there, as shown in FIGS. 19 (b) and 20 (b), the engagement action of the tapers on the proximal end side and the distal end side of the core 42 causes the first to occur. The two divided pieces 71 are moved inward by a gap Z3 formed between the two divided pieces 71. By this movement, the arcuate outer surface 74b of the second main body 72b is also removed from the inner surface of the cast product S, and the core 42 is removed from the entire inner surface of the cast product S.

  When the second divided piece 71 comes into contact with the first divided piece 61, the second rear taper portion 77 gets over the taper hole 86 c and the second front taper portion 115 gets over the first inner taper portion 124. By overcoming this, the entire core 42 contracts, and a cylindrical portion is formed by the arcuate outer surface 64a of the first base 62a in the first divided piece 61 and the arcuate outer surface 74a of the second base 72a in the second divided piece 71. Is done. This cylindrical portion corresponds to the second columnar portion, and the outer peripheral surface of the cylindrical portion abuts on the small-diameter hole portion 86b of the core insertion hole 86, whereby the core 42 is held by the core proximal end holding portion 54. The On the other hand, on the distal end side of the core 42, the distal end portion is pulled out from the distal end accommodating recess 121.

  Thereafter, while the core 42 is maintained in the contracted state and held in the core proximal end holding portion 54, the relative movement in the left-right direction is as shown in FIG. The divided pieces 61 and 71 are in a free state as long as they contact the inner surface of the accommodation space 53. In this state, the movement of the first slider 33 is continued, and the core 42 is pulled out from the cast product S. In FIG. 19C, the first divided piece 61 and the second divided piece 71 are arranged at the moving end, but the divided pieces 61 and 71 can be moved relative to each other. In other words, the divided pieces 61 and 71 may be alternately arranged.

  As described above, in this embodiment, the first rear taper portion 67 and the first front taper portion 105 provided in the first divided piece 61, the taper hole portion 86c of the core base end holding portion 54, and the core tip holding portion. 55 first inner taper portions 124 constitute first pushing means. Further, the second rear taper portion 77 and the second front taper portion 115 provided in the second divided piece 71, the taper hole portion 86c of the core proximal end holding portion 54, and the first inner taper of the core tip holding portion 55 are provided. The part 124 constitutes a second pushing means.

  Subsequently, when the mold is closed, the core 42 is inserted into the portion that becomes the cavity C by the operation of the core pulling mechanism 35 (see FIG. 5A). The movable mold 13 moves from the state of the separation distance D5 to the mold closed state, and the first slider 33 and the second slider 34 are synchronously moved in the proximity direction (see FIGS. 5B and 5C). As a result, as shown in FIG. 21A, first, the first chamfered portion 106 present at the distal end portion of the first divided piece 61 is the annular tapered portion 127 of the distal end side raised portion 126 in the core proximal end holding portion 54. Abut.

  When the sliders 33 and 34 are further moved synchronously, the first split piece 61 is pushed back into the first slider 33 as shown in FIG. A tapered inner surface 69 of the first back recess 68 of the block 63 abuts on the annular tapered portion 85 of the proximal end raised portion 84. In the meantime, the second chamfered portion 116 existing at the tip portion of the second divided piece 71 also comes into contact with the annular taper portion 127 of the tip-side raised portion 126, thereby being pushed back into the first slider 33.

  When the sliders 33 and 34 are further moved synchronously from there, as shown in FIG. 21 (c), each first divided piece is brought about by the engaging action of the tapers on the proximal end side and the distal end side of the first divided piece 61. 61 is expanded outward in the direction in which both faces each other. As a result, the first split piece 61 has the rear surface of the first flange block 63 in contact with the inner surface of the accommodation space 53, and the distal end portion is fitted into the distal end accommodation recess 121. Even when the tip of the second divided piece 71 comes into contact with the first divided piece 61, the second divided piece 71 is simply pushed back into the first slider 33, and the first divided piece 61 There is no further expansion.

  As the first divided piece 61 moves outward, the second divided pieces 71 whose inner side surface 75 is in contact with the side surface 66 of the first divided piece 61 are also moved outward in the direction in which the two divided pieces face each other. It is expanded. On the back side of the second flange block 73, the tapered inner surface 79 in the second back surface recess 78 abuts on the annular taper portion 85 of the base end side raised portion 84, and the expansion of the second divided piece 71 is guided on the base end side. The Further, the second chamfered portion 116 existing at the distal end portion of the second divided piece 71 comes into contact with the annular tapered portion 127 of the distal end side raised portion 126, and the expansion of the second divided piece 71 is also guided at the distal end side. Thereby, the core 42 is expanded again.

  As described above, after the distance between the movable molds 13 becomes D6, the pinion 94 meshes with the rack 95 and rotates, and the cam shaft 91 also rotates accordingly. Since the upper end position of the cam shaft 91 is not changed at the beginning of the rotation (refer to FIG. 15), the first split piece 61 is expanded by the engagement action between the tapers, and the second split piece 71 is expanded accordingly. The shaft 91 does not work. Then, the upper end position of the cam shaft 91 begins to rise at the stage where the expansion of the core 42 is being completed, and the core support that supports the first divided piece 61 by the inner support point 92 of the cam shaft 91 upon completion of mold closing. The core 42 is locked in the original combination state.

  As described above, in this embodiment, the tapered inner surface 69 and the first chamfered portion 106 provided at both ends of the first divided piece 61, and the annular tapered portion 85 provided in the receiving space 53 and the tip receiving recess 121, respectively. , 127 constitute a first member expanding means. Further, the annular taper portions 85 and 127 and the tapered inner surface 79 and the second chamfered portion 116 provided at both ends of the second divided piece 71 constitute an extension guide means.

  As described above in detail, the present embodiment has the following excellent effects.

  (1) When the core 42 composed of the first divided piece 61 and the second divided piece 71 releases the support from the inside by the camshaft 91, the first divided piece 61 is pushed inward, and then The two split pieces 71 are pushed inward, and the core 42 contracts. Thus, if the arc-shaped outer surfaces 64b and 74b of the divided pieces 61 and 71 are sequentially removed from the inner surface of the cast product S and then pulled out of the core 42, the core 42 is not affected by the mold release resistance. It can be pulled out. For this reason, it is not necessary to provide a draft angle in the core 42, and an actuator for applying a strong pulling force is not required, so that the die casting apparatus 11 can be made compact.

  (2) The support of the 1st division | segmentation piece 61 is cancelled | released only by rotating the inner camshaft 91 provided in the core hollow part 56, and the core 42 can shrink | contract. The core 42 is contracted by pushing the first divided piece 61 and the second divided piece 71 inward from the outside. With such a configuration, when the core 42 is contracted, the internal configuration thereof can be simplified, and the core 42 can be reduced in diameter, and thus the hollow portion of the cast product S can be reduced in diameter.

  (3) The first divided piece 61 and the second divided piece 71 are pushed in on both the proximal end side and the distal end side of the core 42 with the casting space 14 in between. Thereby, pushing of each division | segmentation piece 61 and 71 is performed equally on both sides, and each arc-shaped outer surface 64b, 74b can be reliably removed from the inner surface of the casting product S. FIG.

  (4) For relative movement between the tapered portions 67, 77, 105, and 115 provided on the proximal end side and the distal end side of the divided pieces 61 and 71 and the tapered hole portion 86c or the first inner tapered portion 124, respectively. The divided pieces 61 and 71 are pushed in by the engaging action of both. Thereby, compared with the structure which presses each arcuate outer surface 64,74 separately using an actuator, it can contribute to the compact implementation of an apparatus.

  (5) The tapered portions 67 and 105 of the first divided piece 61 and the tapered portions 77 and 115 of the second divided piece 71 are provided at different positions, and the tapered hole portion 86c or the first inner tapered portion 124 is sequentially engaged. In addition, the second divided piece 71 is pushed in after the first divided piece 61. For this reason, it is not necessary to provide the engaging part corresponding to the taper part 67,105,77,115 for every division | segmentation piece 61,71, and a structure can be simplified.

  (6) When the sliders 33 and 34 move in conjunction with the mold opening, the divided pieces 61 and 71 are pushed inward, so that the core 42 contracts. As described above, the contraction of the core 42 is interlocked with the mold opening operation, so that an operation only for contracting the core 42 is not required, and an increase in the process can be suppressed.

  (7) The first divided piece 61 is pushed in along with the movement of the sliders 33 and 34 after the cam shaft 91 is rotated and the support from the inside is released. For this reason, it can suppress that a malfunction arises in pushing of the 1st division | segmentation piece 61 by rotation of the cam shaft 91. FIG.

  (8) A gap X1 is formed between the inclined pins 23 and 24 of the fixed mold 12 and the movement guide holes 41 and 44 of the sliders 33 and 34. When the mold is opened, the inclined pins 23 and 24 become the gap X1. The cam shaft 91 is rotated while moving the first split piece 61 to release the support. Thereby, while adopting the existing configuration, it is possible to realize a configuration in which the movement start time of each slider 33 and 34 is shifted later and the cam shaft 91 is rotated during that time.

  (9) The small diameter hole portion 86b of the core proximal end holding portion 54 is inserted and supported through a columnar portion (first columnar portion) composed of the first main body portion 62b and the second main body portion 72b. Even after the core 42 is contracted, the cylindrical portion (second columnar portion) constituted by the first base portion 62a and the second base portion 72a is inserted and supported. As a result, the core 42 can maintain the state in which the divided pieces 61 and 71 are combined and attached to the first slider 33 before and after contraction.

  (10) When the sliders 33 and 34 are returned and moved in conjunction with the mold closing, the respective tapered shapes respectively provided at the proximal end and the distal end of the first divided piece 61 with respect to the annular tapered portions 85 and 127, respectively. The portions (tapered inner surface 69 and first chamfered portion 106) engage with each other. Due to the engaging action of both of them, the first divided piece 61 can be expanded outward, and accordingly, the second divided piece 71 can also be expanded outwardly and the core 42 can be expanded again. Thereby, since the expansion of the core 42 can be performed in conjunction with the mold closing operation, a separate operation for expanding the core 42 is not required, and an increase in the number of processes can be suppressed.

  (11) Each tapered portion (tapered inner surface 79 and second chamfered portion 116) provided at the proximal end and the distal end of the second divided piece 71 engages with the annular tapered portions 85 and 127, thereby The expansion of the second divided piece 71 accompanying the expansion of the first divided piece 61 is guided. Thereby, the 2nd division | segmentation piece 71 can be expanded smoothly.

  (12) When the gap Z1 necessary for pushing the first divided piece 61 is ensured, the pinion 94 and the rack 95 are disengaged. Therefore, the rotation of the camshaft 91 is not continued more than necessary to release the support of the first divided piece 61, and the camshaft 91 is again placed in the support state by the continued rotation of the pinion 94, so that the first It can suppress that a malfunction generate | occur | produces in pushing of the division | segmentation piece 61. FIG.

  (13) The cam shaft 91 has a chamfered substantially rhombus-shaped cross section. When the pinion 94 and the rack 95 are disengaged, the first parallel surface 91a is located on the inner side of the first divided piece 61. They are arranged in a state parallel to the plane 65. Thereby, since the inner flat surface 65 of the pushed-in first divided piece 61 comes into contact with the first parallel surface 91a of the cam shaft 91, the first divided piece 61 can be reliably supported by the contact between the surfaces. Further, when the cam shaft 91 rotates in the reverse direction when the mold is closed, the cam shaft 91 stands up toward the first divided piece 61 after rotating by a predetermined angle. That is, at the beginning of the reverse rotation, the cam shaft 91 can be prevented from interfering with the expansion of the first divided piece 61 due to the taper engaging action because it does not stand up to the first divided piece 61 side.

  The embodiment is not limited to the above contents, and may be implemented as follows, for example.

  (A) In the above-described embodiment, as the pushing means, a configuration is adopted in which the divided pieces 61 and 71 are pushed in by the engaging action of the tapers associated with the movement of the core proximal end holding portion 54 and the core distal end holding portion 55. doing. Instead of this, the arc-shaped outer surfaces 64 and 74 of the divided pieces 61 and 71 may be constituted by actuators such as cylinders that press in a direction orthogonal to the central axis.

  Further, the pushing of the divided pieces 61 and 71 by the engaging action of the tapers is performed on both the proximal end side and the distal end side of the core 42. Instead, the pushing is performed only on one side. You may do it. However, in order to reliably remove the arc-shaped outer surfaces 64 and 74 of the divided pieces 61 and 71 from the inner surface of the cast product S, it is preferable to employ double-sided pressing that can perform pressing evenly on both sides.

  (B) In the above embodiment, the pair of sliders 33 and 34 are moved in conjunction with the mold opening and mold closing, and the divided pieces 61 and 71 are pushed or expanded accordingly. Such linkage is not essential. For example, the portion corresponding to the core proximal end holding portion 54 or the core distal end holding portion 55 is moved independently, and the movement causes pushing and expanding separately from the mold opening and closing operations. For example, the pulling operation 42 and the returning operation 42 may be performed. Further, the moving direction of the core tip holding portion 55 and the core tip holding portion 55 in that case may be moved in directions close to each other at the time of pushing.

  FIG. 22 shows a schematic diagram as an example. As shown in FIG. 22A, the first divided piece 61 is provided with a tapered portion 131 that inclines outward toward the intermediate portion. A cylindrical core holding portion 132 is provided at both ends of the core 42, and the combined state is held together with the cam shaft 91 provided in the core hollow portion 56. After rotating the camshaft 91 to release the support, when the core holding portions 132 are moved toward each other, the opening edge portion 133 of the core holding portion 132 is engaged with the taper portion 131, both of them. Due to the engaging action, the first divided piece 61 is pushed inward as shown in FIG.

  In this alternative embodiment, the first divided piece 61 is expanded by returning the core holding part 132 to the original position shown in FIG. This is done by moving in directions close to each other. In this case, the expansion member 134 is formed with a tapered portion 135 that engages with the first chamfered portion 106 of the first divided piece 61. Although the second divided piece 71 is not shown, it is pushed in by the engagement action between the tapered portion and the opening edge portion 133 of the core holding portion 132 using the gap formed by the movement of the first divided piece 61. The point which is expanded with the expansion of the 1st division | segmentation piece 61 is the same as the said embodiment.

  (C) In the above embodiment, the tapered hole portion 86c provided on the inner surface of the core proximal end holding portion 54 is the pushing engagement portion. For example, the large-diameter hole portion 86a and the small-diameter hole portion 86b An intermediate step may be used as the engaging portion for pushing. For reference, in another embodiment shown in FIG. 22, the opening edge 133 that engages with the tapered portion 131 of the first divided piece 61 is not a tapered shape but a stepped portion.

  (D) In the above embodiment, the cam rotation mechanism for rotating the cam shaft 91 is constituted by the pinion 94 and the rack 95. Instead, the cam shaft 91 is connected to an output shaft of a built-in motor or the like. You may make it rotate by the drive. Further, the rotation angle when the camshaft 91 is released is not 90 degrees as in the above embodiment, but may be 60 degrees or 120 degrees, for example.

  (E) In the above embodiment, the cam shaft 91 has a chamfered substantially rhombus-shaped cross section, but the cross section shape is arbitrary, and may be, for example, an elliptical shape. Even when the cross-sectional shape is changed in this way, it is determined by the relationship with various design elements such as the rotation angle of the cam shaft 91, the dimension of the first divided piece 61, the rotation of the pinion 94, and the like. It is necessary to ensure a sufficient pressing amount (gap Z1) of the piece 61.

  Moreover, as shown in FIG. 23, it has a horizontally long substantially hexagonal shape (a shape in which a pair of long sides form a convex chevron in a substantially rectangular shape), and has a cross-section in which corner portions are chamfered to form a rounded shape. The cam shaft 141 may be used. FIG. 23 shows a state in which the cam shaft 141 is rotated by the mold closing operation in the order of (a) to (e) as in FIG. Similarly to the substantially rhombic shape in the above embodiment, the cam shaft 141 has a first parallel surface 141a and a second parallel surface 141b, and the second parallel surface 141b is in a horizontal state by turning (c) state. The upper and lower end positions move to the inner plane 65 side.

  However, unlike the camshaft 91 of the embodiment, the camshaft 141 of this another form has a wide curved surface portion 141c that faces the long axis α direction. As shown in (e), when the mold closing is completed (that is, when the core 42 is expanded), the inner support point 142 that supports the first divided piece 61 from the inside exists on the curved surface portion 142. In the cross section perpendicular to the central axis R, the upper and lower inner support points 142 are arranged on a straight line. This straight line is a line along the opposing direction of the first divided pieces 61, and with such an arrangement, the support of the first divided pieces 61 arranged opposite to each other in the core 42 in the expanded state is stronger. Become. The inner support point 142 corresponds to an inner contact portion.

  (F) In the above embodiment, the core 42 is configured by combining the pair of first divided pieces 61 and the pair of second divided pieces 71, but the number of the divided pieces 61 and 71 may be changed as appropriate. May be. Even in such a case, it is necessary that the second divided piece 71 is interposed between the first divided pieces 61 and the second divided piece 71 can be extruded by the outward movement of the first divided piece 61. It becomes. The cross-sectional dimension of the illustrated first divided piece 61 is merely an example, and the cross-sectional dimension of the first divided piece 61 is arbitrary as long as the upper base side is a substantially trapezoidal shape shorter than the lower base side.

  (G) In the above embodiment, the core 42 is formed in a columnar shape, but is formed in a columnar shape having a polygonal cross section, such as a quadrangular columnar shape, or a columnar shape having an elliptical cross section. It is also possible.

  (H) In the above embodiment, the small-diameter hole 86b of the core proximal end holding portion 54 is the outer abutting portion, and the inner peripheral surface thereof is the core holding surface. It is not necessary to contact the entire outer peripheral surface of 42. For example, the core proximal end holding portion 54 may be formed in a comb-like shape having a total of four contact pieces that contact the arcuate outer surfaces 64 and 74 of the divided pieces 61 and 71. Also with this configuration, it is possible to restrict the movement of the individual divided pieces 61 and 71 from the outer peripheral side.

  (I) In the above embodiment, the second rear taper portion 77 starts to tilt from the rear end of the first rear taper portion 67, and the second front taper portion 115 starts to tilt from the front end of the first front taper portion 105. The first divided piece 61 is pushed in and the second divided piece 71 is distinguished from each other. Instead, the second rear taper portion 77 and the second front taper portion 115 are formed so as to start to incline from the front of the rear ends of the first rear taper portion 67 and the first front taper portion 105, respectively. Before the pushing of the divided piece 61 is completed, the pushing of the second divided piece 71 may be started.

  (J) In the above embodiment, the die casting apparatus 11 that manufactures an aluminum cylindrical member as the cast product S is assumed, but metals other than aluminum (for example, zinc, magnesium, copper, lead, tin, alloys thereof, etc.) ) May be used as a casting metal. Further, the cast product manufactured by the mold apparatus is not limited to the cylindrical member, and the configuration of the above embodiment can be used for forming the hollow portion as long as it is a cast product having a hollow portion.

  DESCRIPTION OF SYMBOLS 11 ... Die casting apparatus (die apparatus), 14 ... Casting space, 23 ... 1st inclination pin (movement mechanism), 24 ... 2nd inclination pin (movement mechanism), 33 ... 1st slider (1st moving body, 1st 1 pusher), 34... Second slider (second moving body, second pusher), 41... First movement guide hole (moving mechanism), 42... Core, 44. 56 ... hollow core part, 61 ... first divided piece (first member), 62a ... first base part (inclined rear part), 62b ... first main part (inclined front part), 64 ... arc-shaped outer surface, 67 ... first 1 rear taper portion (pressing taper portion, first pushing means), 69 ... tapered inner surface (first member pushing and spreading means) 71 ... second divided piece (second member), 72a ... second base (inclined rear portion) 72b ... second main body (inclined front), 74 ... arc-shaped outer surface, 77 ... second rear taper (pushing tape) Part, second pushing means), 79 ... tapered inner surface (expansion guide means), 85 ... annular taper part (first member pushing / expanding means, extension guide means), 86b ... small diameter hole part (outer contact part, core) Holding surface), 86c... Taper hole (pushing engagement portion, pushing annular engagement portion, first and second pushing means), 91... Cam shaft, 93... Rotation shaft (cam rotation mechanism), 94 ... Pinion (cam turning mechanism), 95 ... Rack (cam turning mechanism), 105 ... First front taper part (pressing taper part, first pushing means), 106 ... First chamfering part (first member expanding) Means), 115 ... second front taper part (pressing taper part, second pushing means), 116 ... second chamfering part (expansion guide means), 124 ... first inner taper part (pushing engagement part, pushing use) Annular engaging portion, first and second pushing means), 127... Annular tapered portion (first Member 押拡 up means, expansion guide means), Z3 ... gap.

Claims (14)

A mold apparatus having a core in which a plurality of members are combined in a columnar shape,
The core can be pushed outward by a plurality of first members movable in a direction orthogonal to the central axis thereof, and being interposed between the first members and moving the first member outward. A second member, a core outer surface is formed by an outer surface of each member in a combined state of the first member and the second member, and a core hollow portion is formed by an inner surface of each member,
An outer contact portion that contacts the outer surface of each member;
A cam shaft that is provided in the hollow core portion and supports the first member from the inside so that the outer surface of the first member is in contact with the outer contact portion;
A cam rotation mechanism for rotating the cam shaft to release the support state of the first member;
A first pushing means for pushing the first member inward from the outside when the support by the camshaft is released;
A second pushing means for pushing the second member inward using a gap formed between the first member and the first member by the movement of the first member;
A mold apparatus comprising:   The said core is arrange | positioned so that the space for casting may be penetrated, and the said 1st pushing means and the said 2nd pushing means are provided in each of both sides which pinched | interposed the casting space, The said 1st push means is provided. Mold equipment. A pair of moving bodies provided on both sides sandwiching the casting space and moving along a direction in which the casting space extends;
The first pushing means and the second pushing means are both
A pressing taper portion provided on an outer surface of each member, and inclined outward from the outer surface;
A pressing engagement portion that is provided on each of the pair of moving bodies and is engageable with the pressing taper portion of the first member and the pressing taper portion of the second member;
The mold apparatus according to claim 2, further comprising:   The pushing taper portion of the first member and the pushing taper portion of the second member are provided by shifting the position in the central axis direction of the core, and the pushing engagement portion is in the circumferential direction of the core 4. An annular engaging portion for pushing provided in the entire area, and the annular engaging portion for pushing is sequentially engaged with each of the pushing tapered portions by the movement of the movable body. The mold apparatus as described in. The pushing taper portion is inclined toward the both ends of each member,
Of the pair of moving bodies, one is a first moving body that is attached so as to be relatively movable within a range in which one end of the core does not detach, and the other holds the other end of the core in a mold closed state And a second moving body that is released from its holding along with its movement,
5. The mold apparatus according to claim 3, further comprising a moving mechanism that moves the first moving body and the second moving body in directions away from each other in conjunction with mold opening.   6. The mold apparatus according to claim 5, wherein the moving mechanism moves both the moving bodies after the support of the first member is released by the rotation of the cam shaft. The moving mechanism is
An inclined pin provided on the fixed side when the mold is opened,
A moving guide hole provided in each of the moving bodies and for inserting the inclined pin;
And a gap is formed between the inclined pin and the movement guide hole,
7. The gold according to claim 6, wherein the cam rotation mechanism releases the support of the first member by rotating the cam shaft while the inclined pin moves in the gap. Mold device. Each of the members has a tilted front portion having an outer surface before tilting by the tapered portion for pushing, and a tilted rear portion having a bulged outer surface after tilting, and is constituted by the tilted front portion. And the second columnar portion constituted by the inclined rear portion after pressing has the same cross section,
The first moving body is movably inserted through the first columnar portion to serve as the outer abutting portion, and after pushing, the core holding surface that is inserted through the second columnar portion and contacts the outer peripheral surface thereof. The mold apparatus according to any one of claims 5 to 7, wherein the mold apparatus is provided. The moving mechanism is configured to move the pair of moving bodies in a direction approaching each other in conjunction with mold closing,
Along with the movement, the apparatus further comprises first member expanding means for expanding outwardly by pressing the first member in the pressed state from both sides along the longitudinal direction thereof. Item 9. The mold apparatus according to any one of Items 5 to 8. The first member expansion means is
A taper portion for expansion that is provided on both end faces of the first member and is inclined from the end face toward the center side of the core;
An expansion engaging portion that is provided on each of the pair of moving bodies and engages with the expansion taper portion;
The mold apparatus according to claim 9, comprising:   The mold apparatus according to claim 9 or 10, further comprising expansion guide means for guiding the expansion of the second member accompanying the expansion of the first member. The cam rotation mechanism is
A rack provided on the fixed side when the mold is opened;
A pinion connected to the camshaft and meshing with the rack;
And is configured to rotate the camshaft in conjunction with mold opening,
12. The pinion according to claim 1, wherein the pinion is disengaged from the engagement with the rack when a predetermined interval is secured between the first member and the cam shaft. The mold apparatus as described in.   The camshaft has a flat portion parallel to the inner surface of the first member in a state in which the pinion and the rack are disengaged, and reversely rotates toward the support state before release. The mold apparatus according to claim 12, wherein the mold apparatus has a shape that delays the rising to the first member side. A pair of the first members are provided, and both of the first members are combined with the inner surfaces forming the core hollow portion facing each other,
Each inner contact portion of the cam shaft that contacts the inner surface in a state in which the outer surface of each first member is in contact with the outer contact portion is the cross section perpendicular to the central axis of the cam shaft. It exists on the straight line along the opposing direction of 1 member, The metal mold apparatus of any one of Claim 1 thru | or 13 characterized by the above-mentioned.

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