Mold apparatus

Abstract

To reduce a weight of a mold by eliminating a drive device for moving a core.SOLUTION: A mold apparatus for molding a product W having a hole Wt includes: an axial core 30 for forming the hole Wt in the product W; a plurality of split molds 41, 42, 43 that are provided around the axial core 30 and are used to form a wall part Wp around the hole Wt of the product W; a drive device for moving the split molds 41, 42, 43 in a direction intersecting a shaft center of the axial core 30 when mold closing and mold opening; and a linkage mechanism 60 that uses a force of the split mold 41 moving by the drive device when mold closing and mold opening to move the axial core 30 in an axial direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present technology relates to a mold apparatus for molding an article having a hole. [Background technology]

[0002] The technology relating to the above-mentioned mold device is described in Patent Document 1. As shown in Fig. 14, the mold device 100 described in Patent Document 1 includes a fixed mold 102, a movable mold 103, and a core 105 divided into upper and lower parts as a mold for forming the product. The core 105 is provided with a molding recess 106 for forming the outer shape of the product. The core 105 is also provided with a core 108 for forming a hole in the product, which is attached to the inside of the molding recess 106 in a state in which it can be inserted and removed. That is, when the mold device 100 is clamped as shown in Fig. 14, the space between the molding recess 106 of the core 105 and the core 108 becomes a cavity (figure number omitted) for forming the product.

[0003] An operating plate 110 is placed below the movable die 103 of the mold device 100 in a state in which it can be separated from the movable die 103, and a core 108 is connected to the operating plate 110 via a link 112. In a clamped state, as shown in FIG. 14, the core 108 is set inside the molding recess 106 of the core 105 to form a cavity. In this state, a product is molded by injecting molten resin into the cavity. When the molded product is to be removed, the operating plate 110 moves downward from the movable die 103, which operates the link 112 and pulls out the core 108 from the molding recess 106 of the core 105. Next, the mold is opened to open the molding recess 106 of the core 105, and the product is removed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-18904 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described mold apparatus 100, the core 108 is moved by utilizing the operating plate 110 and the link 112. That is, in the above-described mold apparatus 100, in addition to the movable die 103 and the mechanism (not shown) for clamping and opening the core 105, it is necessary to provide a dedicated mechanism for moving the core 108. This makes the mold apparatus 100 larger.

[0006] The present technology has been developed to solve the above-mentioned problems, and the problem that the present invention aims to solve is to reduce the weight of the mold by making it possible to omit a dedicated drive device for moving the core. [Means for solving the problem]

[0007] The above-mentioned problems are solved by each of the technologies. The first technology is a die device for molding a product having a hole, which includes an axial core for forming the hole in the product, a plurality of split dies provided around the axial core for forming a wall portion around the hole in the product, a drive device for moving the split dies in a direction intersecting the axis of the axial core when closing and opening the mold, and an interlocking mechanism for moving the axial core in the axial direction by utilizing the force of the drive device to move the split dies when closing and opening the mold.

[0008] According to the first technology, the interlocking mechanism moves the axial core in the axial direction by utilizing the force of the drive unit to move the split mold when closing and opening the mold. In other words, a dedicated drive unit for moving the axial core is not required. This makes it possible to reduce the weight of the mold unit.

[0009] According to the second technology, the interlocking mechanism includes a pressing member that is connected to the split die and moves together with the split die, and a groove that is formed in the axial core and into which the pressing member that moves together with the split die fits in a slidable manner, and the axial core moves in the axial direction due to relative sliding between the pressing member and the groove.

[0010] According to the third technology, when the mold is opened, the interlocking mechanism moves the axial core in the axial direction after the drive unit has moved the split mold a certain distance. In other words, the axial core separates from the molded product after the split mold separates from the product. This makes it less likely that excessive force will be applied to the product, compared to when the split mold and axial core separate from the product at the same time. This makes it possible to suppress scratches on the product.

[0011] According to a fourth technique, the split mold and the pressing member are connected via an elongated hole and a fastening member that passes through the elongated hole, and the movement of the pressing member is delayed relative to the movement of the split mold by the length of the elongated hole when the mold is opened. In other words, the mechanism for connecting the pressing member to the split mold can be simplified so that the movement of the pressing member is delayed relative to the movement of the split mold.

[0012] According to the fifth technology, a die support part is provided that movably supports a split die, and a coolant supply passage is formed in the die support part to supply coolant to the cooling passage inside the axial core, and the coolant supply passage in the die support part and the cooling passage in the axial core are connected via a connector member, and the connector member connects the coolant supply passage in the die support part and the cooling passage in the axial core while the axial core is movable in the axial direction relative to the die support part. In other words, since coolant can be supplied to the cooling passage in the axial core by using the die support part, it is not necessary to move the coolant supply passage together with the axial core 30. This eliminates the need to secure a movement space for the coolant supply passage.

[0013] According to a sixth technique, a die support part is provided that movably supports the split die, and a pressing member connected to the split die via a long hole and a fastening member is configured to be able to slide along the die support part while being sandwiched between the split die and the die support part. Therefore, rattling is less likely to occur when the pressing member connected to the split die via a long hole and a fastening member moves along the die support part. Effect of the Invention

[0014] According to the technology of the present application, a dedicated drive device for moving the axial core can be omitted, which makes it possible to reduce the weight of the die. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of a product (throttle body) molded by the mold device according to the embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic overall side view of the mold device (when mold is clamped). [Diagram 3] FIG. 2 is a schematic overall side view of the mold device (when the mold is open). [Figure 4] FIG. 2 is a schematic vertical cross-sectional view showing the relationship between a fixed mold, a movable mold, and a throttle body (cavity) of a mold device during mold clamping. [Diagram 5] FIG. [Figure 6] 6 is a schematic vertical cross-sectional view (enlarged view taken along the V arrow in FIG. 5) perpendicular to the axis of the split mold and the shaft-shaped core when the movable mold is clamped. [Figure 7] FIG. 2 is an overall vertical cross-sectional view taken along the axis of an axial core in the movable die. [Figure 8] 11 is a perspective view of a first split die and a pressing member of an interlocking mechanism as viewed from the bottom front. FIG. [Figure 9] 13 is a perspective view of a pressing member of the interlocking mechanism as viewed from the bottom front. FIG. [Figure 10] FIG. 2 is a perspective view of the first split die, the pressing member, the shaft-shaped core, and the throttle body as viewed from the rear. [Figure 11] 13A and 13B are side views illustrating the operation of a pressing member and a groove that constitute the interlocking mechanism. [Figure 12] 13A and 13B are side views illustrating the operation of a pressing member and a groove that constitute the interlocking mechanism. [Figure 13] FIG. 4 is a vertical cross-sectional view showing a cooling mechanism for an axial core. [Figure 14] FIG. 11 is a vertical sectional view showing a conventional die device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [Embodiment 1] A mold apparatus 10 according to a first embodiment of the present invention will be described below with reference to Fig. 1 to Fig. 13. The mold apparatus 10 according to this embodiment is a mold apparatus for molding a throttle body W of an engine throttle device. Here, front, rear, left, right, and up and down shown in the drawings refer to front, rear, left, right, and up and down of the mold apparatus 10.

[0017] <Overview of the throttle body W of the throttle device> A throttle device is a device for adjusting the flow rate of combustion air supplied to a vehicle engine. As shown in Fig. 1, the throttle device includes an aluminum throttle body W and a disk-shaped throttle valve (not shown) configured to be vertically rotatable within an intake passage Wt of the throttle body W. The throttle body W includes a throttle pipe section Wp in which the intake passage Wt is formed, a gear housing section Wh formed on the left side of the throttle pipe section Wp, and a motor housing section Wm formed below the throttle pipe section Wp. A motor (not shown) for rotating the throttle valve and a gear mechanism (not shown) are housed in the motor housing section Wm and the gear housing section Wh of the throttle body W.

[0018] <Overview of mold device 10> The die device 10 is a die casting machine used when molding the throttle body W. As shown in Figs. 2 and 3, the die device 10 includes a fixed die plate 12 and a movable die plate 14. The fixed die plate 12 and the movable die plate 14 are connected to each other at the four corners, top, bottom, left and right, via four tie bars (not shown) extending in the front-rear direction. The movable die plate 14 is configured to be movable in the front-rear direction along the tie bars when the die is closed and opened. A fixed die 15 is attached to the rear surface (inner surface) of the fixed die plate 12 as shown in Figs. 2 and 3. A movable die 20 is attached to the front surface (inner surface) of the movable die plate 14.

[0019] As shown in FIG. 4, the fixed die 15 is a die for forming the front end side of the throttle body W and the front side of the gear housing part Wh. The movable die 20 is a die for forming the main part of the throttle body W (the part excluding the front end side of the throttle body W and the front side of the gear housing part Wh) and the intake passage Wt. As the movable die plate 14 advances toward the fixed die plate 12, as shown in FIG. 2 and FIG. 4, the mating surface (not shown) of the movable die 20 comes into surface contact with the mating surface (not shown) of the fixed die 15, and the mold is closed. As a result, a cavity K, which is a space for forming the throttle body W, is formed between the fixed die 15 and the movable die 20. Also, as the movable die plate 14 retreats and moves in a direction away from the fixed die plate 12, as shown in FIG. 3, the mating surface of the movable die 20 leaves the mating surface of the fixed die 15, and the mold is opened. Note that the figure does not include a molten aluminum supply device and the like in the mold device 10.

[0020] <About the movable type 20> As described above, the movable die 20 is a die for forming the main portion of the throttle body W and the intake passage Wt (see FIG. 4). As shown in FIG. 4, the movable die 20 is provided with an axial core 30 for forming the intake passage Wt of the throttle body W. The axial core 30 is positioned horizontally so that its axis extends in the front-rear direction, and is configured to be movable a certain distance in the axial direction. In addition, as shown in FIG. 5 and FIG. 6, the movable die 20 is provided with a first split die 41, a second split die 42, and a third split die 43 that are provided around the axial core 30 and are used to form the throttle pipe portion Wp of the throttle body W, etc.

[0021] As shown in Fig. 6, the molding surfaces of the first split mold 41, the second split mold 42, and the third split mold 43 become continuous when the molds are closed. The continuous molding surfaces of the first split mold 41, the second split mold 42, and the third split mold 43 form the outer circumferential surface of the throttle pipe portion Wp, etc. When the molds are opened, the first split mold 41, the second split mold 42, and the third split mold 43 move radially outward (up, down, left, and right) from the axial core 30, so that the molding surfaces of the respective molds 41, 42, and 43 are separated from each other.

[0022] As shown in Fig. 5, the movable die 20 supports the axial core 30 so as to be movable in the axial direction (front-rear direction), and further includes a die support section 50 which supports the first split die 41, the second split die 42, and the third split die 43 so as to be movable in directions (up-down and left-right directions) perpendicular to the axial core 30. As shown in Fig. 7, the die support section 50 is composed of a central section 51 which supports the axial core 30 so as to be movable in the axial direction (front-rear direction), and a guide plate 52 which is erected on the rear side of the central section 51 and which guides the movement of the first split die 41, the second split die 42, and the third split die 43 in the up-down and left-right directions. Furthermore, a push-out mechanism 55 is provided on the rear side of the guide plate 52 of the die support section 50 to push out the molded throttle body W from the cavity K of the movable die 20 when the die is opened.

[0023] 5, an upper hydraulic cylinder 21, a left hydraulic cylinder 22, and a right hydraulic cylinder 23 are attached to the upper, left, and right parts of the die support part 50. The upper hydraulic cylinder 21 is attached in an upright state so that the piston rod 21p protrudes downward, and the first split die 41 is connected to the tip of the piston rod 21p. As a result, when the upper hydraulic cylinder 21 operates, the first split die 41 moves vertically above the axial core 30 between a die clamping position and a die opening position.

[0024] The left hydraulic cylinder 22 is attached sideways so that the piston rod 22p protrudes to the right, and the second split die 42 is connected to the tip of the piston rod 22p. As a result, when the left hydraulic cylinder 22 operates, the second split die 42 moves left and right between a die clamping position and a die opening position on the left side of the axial core 30. The right hydraulic cylinder 23 is attached sideways so that the piston rod 23p protrudes to the left, and the third split die 43 is connected to the tip of the piston rod 23p. As a result, when the right hydraulic cylinder 23 operates, the third split die 43 moves left and right between a die clamping position and a die opening position on the right side of the axial core 30.

[0025] <About Interlocking Mechanism 60> 4 and 7, the movable die 20 is provided with an interlocking mechanism 60 that uses the force that moves the first split die 41 up and down to move the axial core 30 a fixed distance in the axial direction. The interlocking mechanism 60 is composed of a pressing member 600 connected to the rear side of the first split die 41, and an inverted U-shaped groove 32 that is formed at the base end of the axial core 30 and into which an inverted U-shaped tip end 604 of the pressing member 600 fits from above.

[0026] <Regarding the pressing member 600 of the interlocking mechanism 60> As shown in Figs. 8 to 10, the pressing member 600 includes a strip-shaped vertical plate portion 602, an inverted U-shaped tip portion 604 provided on the lower side of the vertical plate portion 602, and a horizontal plate portion 605 formed in a shelf shape protruding forward at the center in the height direction of the vertical plate portion 602. Here, as shown in Figs. 4 and 7, the rear surface of the first split mold 41 is provided with a step portion 41s that can abut against the upper surface of the horizontal plate portion 605 of the pressing member 600 from above, and a rear vertical wall portion 41y that abuts against the front surface of the vertical plate portion 602 of the pressing member 600 above the step portion 41s to hold the pressing member 600 in an upright state. Also, the rear surface of the first split mold 41 is provided with a rear guide wall portion 41x that can guide the tip guide surface 605f of the horizontal plate portion 605 of the pressing member 600 in the upright direction below the step portion 41s.

[0027] 9 and 10, the pressing member 600 is formed with a pair of elongated vertical holes 607 which penetrate the horizontal plate portion 605 in the width direction (front-rear direction) from the rear surface of the vertical plate portion 602 and open at the tip surface (front surface) of the horizontal plate portion 605. The pair of elongated vertical holes 607 are formed long in the up-down direction, and a bolt (not shown) is passed through each of the elongated vertical holes 607. The pressing member 600 is connected to the rear surface of the first split mold 41 by these bolts. Here, the dimension L of the elongated vertical holes 607 in the height direction is set to a value which allows the pressing member 600 to move up and down by approximately 15 mm relative to the first split mold 41.

[0028] With the above configuration, when the mold is closed, the first split mold 41 descends to the lowest position as shown in Fig. 7, and the pressing member 600 descends to the lowest position together with the first split mold 41 as the horizontal plate portion 605 is pressed by the step portion 41s of the first split mold 41. In contrast, when the mold is opened, even if the first split mold 41 rises, the pressing member 600 is held at the lowest position by the function of the vertically long hole 607, and when the first split mold 41 rises by about 15 mm, the pressing member 600 rises together with the first split mold 41 due to the connection between the vertically long hole 607 and the bolt. Here, a spacer 52s is provided on the front surface of the guide plate 52 that guides the first split mold 41 in the up-down direction, as shown in Fig. 7, to suppress rattling of the pressing member 600 by pressing the rear surface of the vertical plate portion 602 of the pressing member 600.

[0029] As shown in Figs. 9 and 10, the inverted U-shaped tip 604 of the pressing member 600 is formed into an inverted U shape by left and right protrusions 604t and a connecting portion 604c connecting the upper portions of the protrusions 604t. The inverted U-shaped tip 604 is inclined backward with respect to the vertical plate portion 602 of the pressing member 600 as shown in Figs. 11 and 12. That is, the inverted U-shaped tip 604 is inclined so as to be gradually positioned rearward as it approaches the tips (lower ends) of the left and right protrusions 604t from the position of the connecting portion 604c at the upper end. Here, the inclination angle of the inverted U-shaped tip 604 with respect to the rear surface (vertical surface) of the vertical plate portion 602 of the pressing member 600 is set to θ° (θ=about 5°) as shown in Figs. 11 and 12.

[0030] <Regarding the inverted U-shaped groove portion 32 of the interlocking mechanism 60> As described above, the inverted U-shaped groove 32 is a groove formed at the base end of the axial core 30, into which the inverted U-shaped tip 604 of the pressing member 600 fits from above. As shown in Figs. 10 to 12, the inverted U-shaped groove 32 includes vertical grooves 32t formed on the left and right side surfaces of the axial core 30, and a communicating groove 32c (see Fig. 12) formed at the top of the axial core 30 and connecting the tops of the left and right vertical grooves 32t. The left and right vertical grooves 32t of the inverted U-shaped groove 32 are portions into which the left and right protrusions 604t of the inverted U-shaped tip 604 of the pressing member 600 are inserted from above and fitted, respectively, and are inclined at an inclination angle θ equal to that of the left and right protrusions 604t. Furthermore, the communicating groove portion 32c of the inverted U-shaped groove portion 32 is a portion that engages with the connecting portion 604c of the inverted U-shaped tip portion 604 of the pressing member 600 that has been lowered to the lowest position.

[0031] <Operation of the interlocking mechanism 60> When the pressing member 600 is in the upper limit position together with the first split die 41, i.e., the die open position (see FIG. 12), the tip of the protrusion 604t of the inverted U-shaped tip 604 of the pressing member 600 is engaged with the upper end of the vertical groove 32t of the inverted U-shaped groove 32 of the axial core 30. When the first split die 41 starts to descend from this state, the first split die 41 and the pressing member 600 descend simultaneously with the vertical elongated hole 607 and the bolt connected. Then, as shown in FIG. 4, when the step 41s of the first split die 41 abuts against the upper surface of the horizontal plate 605 of the pressing member 600, the pressing member 600 is pressed downward by the first split die 41.

[0032] 11, the left and right protrusions 604t of the inverted U-shaped tip 604 of the pressing member 600 are pressed from above into the left and right vertical grooves 32t of the inverted U-shaped groove 32 of the axial core 30. As a result, the front faces of the left and right protrusions 604t of the pressing member 600 and the front side faces of the left and right vertical grooves 32t of the axial core 30 slide relative to each other, and the protrusions 604t of the pressing member 600 press the vertical grooves 32t of the axial core 30 forward. As a result, the axial core 30 advances in the axial direction and is held in the mold clamping position.

[0033] 11, the inverted U-shaped tip 604 of the pressing member 600 is at the lower limit position (mold clamping position) and engages with the inverted U-shaped groove 32 of the axial core 30. Then, when the first split die 41 rises by about 15 mm and the bolt engages with the upper end of the vertical hole 607, the pressing member 600 rises together with the first split die 41. As a result, the left and right protrusions 604t of the inverted U-shaped tip 604 of the pressing member 600 rise and are pulled out of the left and right vertical grooves 32t of the inverted U-shaped groove 32 of the axial core 30. At this time, the rear surfaces of the left and right protrusions 604t of the pressing member 600 and the rear side surfaces of the left and right vertical grooves 32t of the axial core 30 slide relative to each other, and the protrusions 604t of the pressing member 600 press backward the vertical grooves 32t of the axial core 30. As a result, the axial core 30 moves backward in the axial direction and is returned to a position where it abuts against the front surface of the guide plate 52 (mold opening position). Here, the forward and backward movement distance of the axial core 30 is set to about 4.6 mm.

[0034] <Cooling mechanism 70 for the axial core 30> As shown in Fig. 13, the movable die 20 is provided with a cooling mechanism 70 for cooling the axial core 30. The cooling mechanism 70 is a mechanism for supplying cooling water to a cooling passage 35 formed inside the axial core 30. As shown in Fig. 13, the cooling passage 35 of the axial core 30 is formed so as to extend in the axial direction from the base end (rear end) of the axial core 30 to near the tip end. Furthermore, a cylindrical recess 36 is formed at the rear end of the axial core 30 with a larger diameter than the cooling passage 35 and communicating with the cooling passage 35.

[0035] 13, the cooling mechanism 70 includes a cooling pipe 72 inserted up to near the tip of the cooling passage 35 of the axial core 30, a cooling water supply passage 75 formed inside the guide plate 52 (die support part 50), and a cooling water return passage 76. The cooling mechanism 70 also includes a connector member 74 that connects the cooling pipe 72 to the cooling water supply passage 75 and further connects the cylindrical recess 36 of the axial core 30 to the cooling water return passage 76.

[0036] The connector member 74 is a cylindrical member fixed to the front surface of the guide plate 52, and is inserted into the cylindrical recess 36 of the axial core 30 in a state in which it can move relative to the cylindrical recess 36 in the axial direction. A ring-shaped sealant (not shown in the figure) is attached to the outer circumferential surface of the connector member 74. As a result, when the connector member 74 is inserted into the cylindrical recess 36 of the axial core 30, the connector member 74 and the cylindrical recess 36 of the axial core 30 are sealed in a watertight state by the sealant. The connector member 74 is formed with a supply communication passage 74x that communicates the cooling pipe 72 and the cooling water supply passage 75, and a return communication passage 74y that communicates the cylindrical recess 36 of the axial core 30 and the cooling water return passage 76 inside the guide plate 52.

[0037] As a result, the cooling water supplied to the cooling pipe 72 from the cooling water supply passage 75 of the guide plate 52 via the connector member 74 is discharged from the tip of the cooling pipe 72 into the cooling passage 35. The cooling water cools the axial core 30 from the inside, flows to the base end, and is then returned from the cylindrical recess 36 via the connector member 74 to the cooling water return passage 76.

[0038] <Operation of the mold device 10> The procedure from the mold device 10 being in the mold open state to molding the throttle body W will be described. First, the upper hydraulic cylinder 21, the left hydraulic cylinder 22, and the right hydraulic cylinder 23 of the movable mold 20 are driven to move the first split mold 41, the second split mold 42, and the third split mold 43, which are in the mold open position, to the mold clamping position. That is, the first split mold 41 descends to the mold clamping position, the second split mold 42 moves rightward to the mold clamping position, and the third split mold 43 moves leftward to the mold clamping position.

[0039] Here, the pressing member 600 of the interlocking mechanism 60 is connected to the first split die 41 via a vertically long hole 607 and a bolt, and the tip of the protrusion 604t of the inverted U-shaped tip portion 604 of the pressing member 600 is engaged with the upper end of the vertical groove portion 32t of the inverted U-shaped groove portion 32 of the axial core 30, as shown in Fig. 12. Therefore, when the first split die 41 starts to descend, the first split die 41 and the pressing member 600 descend simultaneously.

[0040] Then, as shown in Fig. 4, when the step portion 41s of the first split die 41 abuts against the upper surface of the horizontal plate portion 605 of the pressing member 600, the pressing member 600 is pressed downward by the first split die 41. As a result, as shown in Fig. 11, the left and right protrusions 604t of the inverted U-shaped tip portion 604 of the pressing member 600 are pressed from above into the left and right vertical grooves 32t of the inverted U-shaped groove portion 32 of the shaft-shaped core 30. As a result, the front faces of the left and right protrusions 604t of the pressing member 600 and the front side faces of the left and right vertical grooves 32t of the shaft-shaped core 30 slide relative to each other, and the protrusions 604t of the pressing member 600 press the vertical grooves 32t of the shaft-shaped core 30 forward. As a result, the shaft-shaped core 30 advances in the axial direction and moves to the mold clamping position. That is, at the stage when the first split mold 41 has been lowered to the mold clamping position, the shaft-shaped core 30 advances to the mold clamping position.

[0041] Next, the movable die plate 14 advances toward the fixed die plate 12 from the state shown in Fig. 3, and the mating surface of the movable die 20 comes into surface contact with the mating surface of the fixed die 15, as shown in Fig. 4, to perform die clamping. In this state, a cavity K, which is a space for forming the throttle body W, is formed between the fixed die 15 and the movable die 20. Next, molten aluminum alloy is injected into the cavity K, and after the solidification time has elapsed, the die is opened.

[0042] When the mold is opened, as shown in Fig. 3, the movable die plate 14 moves back and away from the fixed die plate 12. Next, the upper hydraulic cylinder 21, the left hydraulic cylinder 22, and the right hydraulic cylinder 23 of the movable die 20 are driven to move the first split die 41, the second split die 42, and the third split die 43, which are in the mold clamping position, to the mold opening position. That is, the first split die 41 rises to the mold opening position, the second split die 42 moves leftward to the mold opening position, and the third split die 43 moves rightward to the mold opening position. As a result, the molding surfaces of the first split die 41, the second split die 42, and the third split die 43 move away from the outer peripheral surface of the throttle body W.

[0043] As described above, the first split die 41 and the pressing member 600 are connected via a pair of vertically long holes 607 and a pair of bolts, as shown in Fig. 10 and other figures. Therefore, when the first split die 41 starts to rise, the pressing member 600 does not rise, and as shown in Fig. 11, the inverted U-shaped tip 604 of the pressing member 600 is at the lowest position and engages with the inverted U-shaped groove 32 of the axial core 30. In other words, the axial core 30 is held at the clamping position and is in close contact with the inner circumferential surface of the throttle body W. Then, when the first split die 41 rises by about 15 mm and the bolts engage with the upper ends of the vertically long holes 607, the pressing member 600 rises together with the first split die 41.

[0044] As a result, the left and right protrusions 604t of the inverted U-shaped tip 604 of the pressing member 600 rise and are pulled out of the left and right vertical grooves 32t of the inverted U-shaped groove 32 of the axial core 30. At this time, the rear surfaces of the left and right protrusions 604t of the pressing member 600 and the rear side surfaces of the left and right vertical grooves 32t of the axial core 30 slide relative to each other, and the protrusions 604t of the pressing member 600 press the vertical grooves 32t of the axial core 30 backward. As a result, as shown in Fig. 12, the axial core 30 moves backward in the axial direction and is returned to a position (die opening position) where it abuts against the front surface of the guide plate 52, and the axial core 30 comes to be separated from the inner peripheral surface of the throttle body W. Next, the pushing-out mechanism 55 of the movable die 20 operates to push out the throttle body W in the cavity K.

[0045] <Regarding the correspondence between the terms used in this embodiment and the terms related to the present invention> The throttle body W in this embodiment corresponds to the product having a hole in the present invention, and the intake passage Wt of the throttle body W corresponds to the hole in the present invention. The upper hydraulic cylinder 21, the left hydraulic cylinder 22, and the right hydraulic cylinder 23 correspond to the drive device in the present invention. The vertical groove portion 32t of the inverted U-shaped groove portion of the axial core 30 corresponds to the groove portion of the axial core in the present invention. The pair of vertical elongated holes 607 and the pair of bolts connecting the first split die 41 and the pressing member 600 correspond to the elongated holes and fastening members in the present invention. The guide plate 52 of the die support portion 50 corresponds to the die support portion that movably supports the split die in the present invention. The cooling water in the cooling mechanism 70 corresponds to the coolant in the present invention, and the cooling water supply passage 75 and the cooling water return passage 76 correspond to the coolant supply passage in the present invention.

[0046] <Advantages of the mold device 10 according to this embodiment> According to the mold device 10 of this embodiment, the interlocking mechanism 60 moves the axial core 30 in the axial direction by utilizing the force of the upper hydraulic cylinder 21 (drive device) moving the first split mold 41 during mold closing and mold opening. That is, a dedicated drive device for moving the axial core 30 is not required. This makes it possible to reduce the weight of the mold device 10. In addition, the interlocking mechanism 60 moves the axial core 30 in the axial direction from a state in which the upper hydraulic cylinder 21 moves the first split mold 41 by a certain distance during mold opening. That is, after the first split mold 41, the second split mold 42, and the third split mold 43 are separated from the molded product (throttle body W), the axial core 30 is separated from the throttle body W. Therefore, excessive force is less likely to be applied to the throttle body W compared to the case in which the first split mold 41, etc. and the axial core 30 are simultaneously separated from the molded throttle body W. This makes it possible to suppress scratches on the throttle body W.

[0047] In addition, in the mold device 10, the first split mold 41 and the pressing member 600 of the interlocking mechanism 60 are connected via a vertically long hole 607 (long hole) and a bolt (fastening member) that is passed through the vertically long hole 607. Then, when the mold is opened, the movement of the pressing member 600 is delayed relative to the movement of the first split mold 41 by the length dimension of the vertically long hole 607. That is, the mechanism for connecting the pressing member 600 to the first split mold 41 is simplified so that the movement of the pressing member 600 is delayed relative to the movement of the first split mold 41.

[0048] Furthermore, the die device 10 is equipped with a guide plate 52 (die support portion 50) that guides the movement of the first split die 41, and a cooling water supply passage 75 that supplies cooling water (coolant) to the cooling passage 35 inside the axial core 30, and a cooling water return passage 76 (coolant supply passage) are formed in the guide plate 52. The cooling water supply passage 75 and the cooling water return passage 76 of the guide plate 52 communicate with the cooling passage 35 of the axial core 30 via a connector member 74. The connector member 74 communicates the cooling water supply passage 75 and the cooling water return passage 76 of the guide plate 52 with the cooling passage 35 of the axial core 30 while the axial core 30 is able to move axially relative to the guide plate 52. That is, since cooling water can be supplied to the cooling passage 35 of the axial core 30 by utilizing the cooling water supply passage 75 and the cooling water return passage 76 of the guide plate 52, it is not necessary to move the cooling water supply passage 75 and the cooling water return passage 76 together with the axial core 30. Therefore, it is not necessary to secure movement space for the cooling water supply passage 75 and the cooling water return passage 76, and the movable die 20 can be made smaller.

[0049] Furthermore, in the mold device 10, the pressing member 600 connected to the first split die 41 via the vertically long hole 607 (long hole) and the bolt (fastening member) is configured to be slidable along the guide plate 52 while being sandwiched between the first split die 41 and the spacer 52s of the guide plate 52. For this reason, when the pressing member 600 connected to the first split die via the vertically long hole 607 and the bolt moves along the guide plate 52, rattling is unlikely to occur.

[0050] <Example of change> Here, the present invention is not limited to the above embodiment, and modifications are possible within the scope of the present invention. For example, in the present embodiment, the first split mold 41, which can move in the vertical direction, and the pressing member 600 of the interlocking mechanism 60 are connected to each other, and the pressing member 600 is moved vertically together with the first split mold 41. However, the second split mold 42 or the third split mold 43 and the pressing member 600 are connected to each other, and the pressing member 600 is moved horizontally together with the second split mold 42, etc., and a configuration is also possible. Also, in the present embodiment, the first split mold 41 and the pressing member 600 of the interlocking mechanism 60 are connected to each other via a vertically long hole 607 and a bolt. However, the first split mold 41 and the pressing member 600 of the interlocking mechanism 60 are connected to each other in a state in which they can move relatively in the vertical direction, and the shelf-like horizontal plate portion 605 of the pressing member 600 is inserted between upper and lower stoppers formed on the rear surface of the first split mold 41. In addition, in this embodiment, the mold device 10 in a die casting machine is exemplified, but the present invention can also be applied to a mold device in an injection molding device for meltable materials such as metals other than aluminum and resins. [Explanation of symbols]

[0051] 10. Mold equipment 21 Upper hydraulic cylinder (drive unit) 22....Left hydraulic cylinder (drive unit) 23 Right hydraulic cylinder (drive unit) 30...Shaft core 32t...Vertical groove (groove) 35...Cooling passage 41...1st division type 42...Second split type 43...Third division type 52 Guide plate (mold support part) 52s···Spacer (mold support part) 60... Interlocking mechanism 72 Cooling pipe 74 Connector parts 75 Cooling water supply passage (coolant supply passage) 76 Cooling water return passage (coolant supply passage) 600 Pressing member 604t...Protrusion 607....Vertical hole (long hole) K...Cavity W·····Throttle body (product with holes) Wt.... Intake passage (hole)

Claims

1. 1. A mold apparatus for molding a product having a hole, comprising: A shaft-shaped core for forming a hole in the product; a plurality of split dies provided around the axial core for forming a wall portion around a hole in the product; a drive device that moves the split mold in a direction intersecting an axis of the shaft-shaped core when closing and opening the mold; a linkage mechanism that uses a force that causes the split mold to move by the drive device when the mold is closed and opened to move the shaft-shaped core in the axial direction; A mold apparatus having the above structure.

2. The die apparatus according to claim 1, The interlocking mechanism includes: a pressing member connected to the split mold and moving together with the split mold; a groove portion formed in the shaft-shaped core, into which the pressing member moving together with the split die is slidably fitted, The die device is configured so that the shaft-shaped core moves in the axial direction due to relative sliding between the pressing member and the groove portion.

3. The die apparatus according to claim 2, The interlocking mechanism is a die device that moves the axial core from a state in which the drive device has moved the split die a certain distance when the die is opened.

4. The die apparatus according to claim 3, The split mold and the pressing member are connected via a long hole and a fastening member passed through the long hole, and the mold device is configured so that when the mold is opened, the movement of the pressing member is delayed relative to the movement of the split mold by the length dimension of the long hole.

5. The die apparatus according to claim 1, A die support part is provided to movably support the split die, a coolant supply passage for supplying a coolant to the cooling passage inside the shaft-shaped core is formed in the die support portion; a coolant supply passage of the die support portion and a cooling passage of the shaft-shaped core are connected to each other via a connector member; The connector member is a mold device that connects a coolant supply passage of the die support portion to a cooling passage of the axial core while the axial core is movable axially relative to the die support portion.

6. The die apparatus according to claim 4, A die support part is provided to movably support the split die, The pressing member, which is connected to the split mold via the long hole and the fastening member, is configured to be slidable along the mold support part while being sandwiched between the split mold and the mold support part.

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