Molding machine

Abstract

To provide a molding machine which has a simplified structure.SOLUTION: A molding machine includes: a base; a fixed die plate which is fixed onto the base and holds a fixed mold; a movable die plate which is provided on the base so as to be movable in a mold opening / closing direction, and holds a movable mold so as to face the fixed mold; a toggle mechanism which enables mold closing of the fixed mold and the movable mold, and has a cross head and a plurality of links; a link housing that is provided on the base so as to be movable in the mold opening / closing direction, and to which one end of a part of the plurality of links is fixed; an actuator for driving the toggle mechanism; a motor for moving the movable die plate and the link housing; a tie bar which is fixable to the link housing and the fixed die plate, and extends in the mold opening / closing direction; and an injection device which fills the inside of a cavity formed of the fixed mold and the movable mold with molten metal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a molding machine equipped with an electric moving mechanism that moves a toggle mechanism. [Background technology]

[0002] In a die-casting machine, which is an example of a molding machine, a molded product (die-cast product) is manufactured by, for example, filling a cavity in a mold that is clamped using a toggle mechanism with molten metal using an injection device. For example, in order to reduce the manufacturing cost of molded products, it is desirable to simplify the structure of the molding machine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-68610 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a molding machine having a simplified structure. [Means for solving the problem]

[0005] A molding machine of one embodiment of the present invention comprises a base, a fixed die plate fixed on the base and holding a fixed die, a movable die plate movable on the base in the die opening and closing direction and holding a movable die opposite the fixed die, a toggle mechanism capable of clamping the fixed die and the movable die and having a crosshead and a plurality of links, a link housing movable on the base in the die opening and closing direction and to which one end of a portion of the plurality of links is fixed, an actuator for driving the toggle mechanism, a motor for moving the movable die plate and the link housing, a tie bar fixed to the link housing and the fixed die plate and extending in the die opening and closing direction, and an injection device for filling molten metal into a cavity formed by the fixed die and the movable die.

[0006] In the molding machine of the above aspect, the actuator is preferably a hydraulic actuator.

[0007] In the molding machine of the above aspect, it is preferable that the actuator includes a cylinder tube fixed to the link housing, a piston provided in the cylinder tube and movable in the mold opening and closing direction, and a rod having one end fixed to the piston and the other end fixed to the crosshead.

[0008] In the molding machine of the above aspect, it is preferable that the amount of displacement of the gap between the link housing and the movable die plate is 10 mm or less.

[0009] In the molding machine of the above aspect, it is preferable that the actuator is incorporated in the crosshead and includes a cylinder tube and a rod having a portion provided within the cylinder tube and movable in a direction perpendicular to the mold opening and closing direction.

[0010] In the molding machine of the above aspect, it is preferable that the crosshead has a first part connected to one of the plurality of links and a second part connected to another of the plurality of links, and that the cylinder tube is fixed to the first part and the rod is fixed to the second part.

[0011] In the molding machine of the above aspect, the actuator is preferably a hydraulic actuator.

[0012] In the molding machine of the above aspect, the actuator is preferably an electric actuator.

[0013] In the molding machine of the above aspect, it is preferable that the amount of displacement of the gap between the link housing and the movable die plate is 10 mm or less.

[0014] In the molding machine of the above aspect, it is preferable that the tie bar is fixed to either one of the link housing or the fixed die plate and is slidable relative to the other.

[0015] In the molding machine of the above aspect, it is preferable that the other of the two be further provided with a fixing mechanism for fixing the tie bar at a desired position.

[0016] In the molding machine of the above aspect, it is preferable that the tie bar is fixed to the fixed die plate, and at the position where the link housing and the fixed die plate are farthest apart, the end of the tie bar on the link housing side is located closer to the movable die plate than the link housing.

[0017] In the molding machine of the above aspect, it is preferable that the tie bar is fixed to the link housing, and at the position where the link housing and the fixed die plate are farthest apart, the end of the tie bar on the side of the fixed die plate is located on the side of the movable die plate rather than the fixed die plate. Effect of the Invention

[0018] According to the present invention, it is possible to provide a molding machine with a simplified structure. [Brief description of the drawings]

[0019] [Figure 1] 1 is a schematic diagram showing an overall configuration of a molding machine according to a first embodiment. [Diagram 2] FIG. 3 is a flow diagram of a molding operation of the molding machine of the first embodiment. [Diagram 3] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 4] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Diagram 5] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 6] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 7] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 8] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 9] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 10] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 11] FIG. 2 is an explanatory diagram of a molding operation using the molding machine of the first embodiment. [Figure 12] FIG. 4 is a schematic diagram showing an overall configuration of a molding machine according to a modified example of the first embodiment. [Figure 13] FIG. 4 is a schematic diagram showing the overall configuration of a molding machine according to a second embodiment. [Figure 14] FIG. 7 is a flow diagram of a molding operation of a molding machine according to a second embodiment. [Figure 15] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 16] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 17] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 18]FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 19] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 20] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 21] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 22] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 23] FIG. 6 is an explanatory diagram of a molding operation using a molding machine according to a second embodiment. [Figure 24] FIG. 13 is a schematic diagram showing an overall configuration of a molding machine according to a first modified example of the second embodiment. [Diagram 25] FIG. 13 is a schematic diagram showing an overall configuration of a molding machine according to a second modified example of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] In this specification, hydraulic pressure will be used as an example of hydraulic pressure. For example, a hydraulic actuator will be used as an example of a hydraulic actuator. Instead of hydraulic pressure, for example, water pressure can be used. In addition, in this specification, hydraulic oil will be used as an example of a hydraulic fluid.

[0022] (First embodiment) The molding machine of the first embodiment includes a base, a fixed die plate fixed on the base and holding a fixed die, a movable die plate movably provided on the base in the die opening / closing direction and holding a movable die facing the fixed die, a toggle mechanism capable of clamping the fixed die and the movable die and having a crosshead and a plurality of links, a link housing movably provided on the base in the die opening / closing direction and having one end of one of the plurality of links fixed thereto, an actuator for driving the toggle mechanism, a motor for moving the movable die plate and the link housing, a tie bar affixable to the link housing and the fixed die plate and extending in the die opening / closing direction, and an injection device for filling a cavity formed by the fixed die and the movable die with molten metal. The actuator is a hydraulic actuator.

[0023] Fig. 1 is a schematic diagram showing the overall configuration of a molding machine according to a first embodiment, and is a side view partially including a cross-sectional view.

[0024] The molding machine of the first embodiment is a die casting machine 100. The die casting machine 100 of the first embodiment is a cold chamber type die casting machine.

[0025] 1 shows an initial state before the start of operation of the die casting machine 100. The initial state in this case is a state in which the die is fully open, that is, a so-called die open limit state.

[0026] The die-casting machine 100 is a machine that manufactures die-cast products by injecting liquid metal (molten metal) into the interior of a die (cavity Ca in FIG. 1) and solidifying the liquid metal inside the die. The metal is, for example, aluminum, an aluminum alloy, a zinc alloy, or a magnesium alloy.

[0027] The die casting machine 100 includes a base 10, a fixed die plate 12, a movable die plate 14, a link housing 16, a tie bar 18, a tie bar nut 19, a fixed mold 20, a movable mold 22, a toggle mechanism 24, a hydraulic actuator 26 (actuator), a toggle moving mechanism 28, an extrusion mechanism 30, a tie bar fixing mechanism 32 (fixing mechanism), an injection device 34, and an input display device 36.

[0028] The toggle mechanism 24 includes a crosshead 44 and a plurality of links 46 .

[0029] The hydraulic actuator 26 includes a hydraulic cylinder tube 26a, a hydraulic piston 26b, and a hydraulic rod 26c.

[0030] The toggle movement mechanism 28 includes a toggle movement motor 50, a screw shaft 52, a nut portion 54, and a guide rail 55. The toggle movement motor 50 is an electric motor.

[0031] The push-out mechanism 30 includes a push-out plate 56 , a push-out shaft 60 , a pin support plate 62 , a push-out pin 64 , and a push-out motor 66 .

[0032] The tie bar fixing mechanism 32 includes a half nut 70 and a tie bar fixing motor 72 .

[0033] The injection device 34 includes a sleeve 74, a plunger 76, an injection drive unit 78, and a position sensor 80. The plunger 76 includes a plunger tip 76a and a plunger rod 76b. The sleeve 74 is provided with an opening 82.

[0034] The fixed die plate 12 is fixed on the base 10. A fixed die 20 can be attached to the fixed die plate 12.

[0035] The movable die plate 14 is provided on the base 10 so as to be movable in the mold opening and closing direction. The mold opening and closing direction means both the mold opening direction and the mold closing direction shown in Fig. 1 and the like. The movable die plate 14 moves in the mold opening and closing direction on a guide rail 55 provided on the base 10. A movable die 22 can be attached to the movable die plate 14.

[0036] The link housing 16 is provided on the base 10 so as to be movable in the mold opening and closing direction. The link housing 16 moves in the mold opening and closing direction on a guide rail 55 provided on the base 10. One end of some of the multiple links 46 is fixed to the link housing 16.

[0037] The toggle mechanism 24 is provided between the link housing 16 and the movable die plate 14. One end of a portion of the multiple links 46 is fixed to the link housing 16. Also, one end of another portion of the multiple links 46 is fixed to the movable die plate 14.

[0038] The toggle mechanism 24 changes the distance between the link housing 16 and the movable die plate 14. The amount of change in the distance between the link housing 16 and the movable die plate 14 is, for example, 2 mm or more and 10 mm or less.

[0039] The toggle mechanism 24 enables the fixed mold 20 and the movable mold 22 to be clamped together.

[0040] The toggle mechanism 24 is driven by a hydraulic actuator 26. The hydraulic actuator 26 includes a hydraulic cylinder tube 26a, a hydraulic piston 26b, and a hydraulic rod 26c.

[0041] The hydraulic cylinder tube 26a is fixed to the link housing 16. The hydraulic piston 26b is provided in the hydraulic cylinder tube 26a and is movable in the mold opening / closing direction. One end of a hydraulic rod 26c is fixed to the hydraulic piston 26b and the other end is fixed to the crosshead 44. The hydraulic rod 26c is movable in the mold opening / closing direction.

[0042] The hydraulic rod 26c moves in the mold opening / closing direction, thereby moving the crosshead 44 in the mold opening / closing direction. As the crosshead 44 moves in the mold opening / closing direction, the multiple links 46 operate, and the movable die plate 14 moves in the mold opening / closing direction relative to the link housing 16.

[0043] The tie bars 18 extend in the mold opening / closing direction. For example, four tie bars 18 are provided.

[0044] The tie bars 18 can be fixed to the link housing 16 and the fixed die plate 12. The tie bars 18 are fixed to the fixed die plate 12 by tie bar nuts 19. The tie bars 18 pass through the movable die plate 14. The tie bars 18 can slide relative to the movable die plate 14 and the link housing 16.

[0045] The link housing 16 is provided with a tie bar fixing mechanism 32. The tie bar 18 can be fixed or unlocked (released) relative to the link housing 16 using the tie bar fixing mechanism 32. The tie bar fixing mechanism 32 fixes the tie bar 18 in a desired position.

[0046] For example, a saw-like groove is provided on the tip of the tie bar 18 on the side of the link housing 16. The tie bar fixing mechanism 32 controls the opening and closing of the half nuts 70, for example, by a tie bar fixing motor 72. For example, by closing the half nuts 70, the half nuts 70 are fitted into the grooves on the tip of the tie bar 18, and the tie bar 18 is fixed to the link housing 16.

[0047] The tie bars 18 support the clamping force while the clamping force is applied to the fixed mold 20 and the movable mold 22 .

[0048] The tie bars 18 are fixed to the fixed die plate 12, and when the link housing 16 and the fixed die plate 12 are at the farthest position, the ends of the tie bars 18 on the link housing 16 side are located closer to the movable die plate 14 than the link housing 16. When the link housing 16 and the fixed die plate 12 are at the farthest position, the ends of the tie bars 18 on the link housing 16 side are located between the link housing 16 and the movable die plate 14.

[0049] The toggle movement mechanism 28 moves the movable die plate 14 and the link housing 16 in the mold opening and closing direction. The toggle movement mechanism 28 moves the movable die plate 14 and the link housing 16 using a toggle movement motor 50.

[0050] The nut portion 54 is fixed to the link housing 16. The toggle movement motor 50 rotates the screw shaft 52, causing the nut portion 54 to move in the mold opening / closing direction. As the nut portion 54 moves in the mold opening / closing direction, the link housing 16 fixed to the nut portion 54 and the movable die plate 14 connected to the link housing 16 by the multiple links 46 move in the mold opening / closing direction. The link housing 16 and the movable die plate 14 move on guide rails 55.

[0051] The ejection mechanism 30 includes an ejection plate 56, an ejection shaft 60, a pin support plate 62, an ejection pin 64, and an ejection motor 66. The ejection mechanism 30 has a function of ejecting the manufactured die-cast product from the die and separating it.

[0052] The ejection plate 56 is provided between the crosshead 44 and the movable die plate 14. One end of an ejection shaft 60 extending in the mold closing direction is fixed to the ejection plate 56. The ejection shaft 60 penetrates the movable die plate 14. The ejection shaft 60 is slidable relative to the movable die plate 14.

[0053] The other end of the push shaft 60 is fixed to a pin support plate 62. A push pin 64 is fixed to the pin support plate 62. The push pin 64 is indirectly fixed to the push plate 56.

[0054] The ejection pin 64 is provided so as to be able to appear and disappear from the movable mold 22. The ejection pin 64 extends in the mold closing direction. For example, a plurality of ejection pins 64 are provided.

[0055] The ejection plate 56 can be moved in the mold opening / closing direction by the ejection motor 66. When the ejection plate 56 moves in the mold opening / closing direction, the ejection pins 64 move in the mold opening / closing direction.

[0056] The injection device 34 has a function of injecting liquid metal into a cavity Ca inside the mold. The injection device 34 has a sleeve 74, a plunger 76, an injection drive unit 78, and a position sensor 80. The plunger 76 includes a plunger tip 76a and a plunger rod 76b. The sleeve 74 is provided with an opening 82.

[0057] The sleeve 74 communicates with the inside of the fixed mold 20. The sleeve 74 is, for example, a tubular member connected to the fixed mold 20. The sleeve 74 is, for example, cylindrical in shape.

[0058] The plunger 76 slides inside the sleeve 74. A plunger tip 76a fixed to the tip of a plunger rod 76b slides in the front-rear direction inside the sleeve 74. As the plunger tip 76a slides forward inside the sleeve 74, the molten metal in the sleeve 74 is filled into a cavity Ca formed by the fixed die 20 and the movable die 22.

[0059] The injection drive unit 78 has a function of driving the plunger 76 in the forward and backward directions. The injection drive unit 78 is, for example, a hydraulic type, an electric type, or a hybrid type that combines the hydraulic type and the electric type.

[0060] The position sensor 80 has a function of detecting the position of the plunger 76. The position sensor 80 is, for example, an optical or magnetic linear encoder. By differentiating the position of the plunger 76 detected by the position sensor 80, it is possible to detect the speed of the plunger 76.

[0061] The input display device 36 is provided on, for example, the fixed die plate 12. The input display device 36 accepts, for example, an input operation from an operator. The operator can set molding conditions and the like of the die casting machine 100 using the input display device 36. In addition, the input display device 36 displays, for example, the molding conditions and operating status of the die casting machine 100 on a screen. The input display device 36 is, for example, a liquid crystal display or an organic EL display.

[0062] Next, the molding operation using the molding machine of the first embodiment will be described with reference to Fig. 1 to Fig. 11. Fig. 2 is a flow diagram of the molding operation of the molding machine of the first embodiment. Fig. 3 to Fig. 11 are explanatory diagrams of the molding operation using the molding machine of the first embodiment. Fig. 3 to Fig. 11 are diagrams corresponding to Fig. 1.

[0063] As shown in FIG. 2, the molding operation of the die-casting machine 100 of the first embodiment includes an initial state step (S01), a movable die plate advance step (S02), a tie-bar fixing step (S03), a mold clamping step (S04), an injection operation step (S05), a mold opening step (S06), a tie-bar releasing step (S07), a movable die plate retreat step (S08), an extrusion step (S09), and an extrusion return step (S10).

[0064] First, the die casting machine 100 is in an initial state step (S01) (FIG. 1). The initial state is a so-called die open limit state.

[0065] Next, in a movable die plate advancement step (S02), the link housing 16 and the movable die plate 14 are advanced in the mold closing direction (FIG. 3). The link housing 16 and the movable die plate 14 are moved using a toggle movement mechanism 28. The link housing 16 and the movable die plate 14 are advanced, for example, until just before the movable die 22 comes into contact with the fixed die 20.

[0066] After the link housing 16 and the movable die plate 14 stop, the distance between the fixed die 20 and the movable die 22 is, for example, 0.5 mm or more and 2 mm or less. The fixed die 20 and the movable die 22 may be in contact with each other.

[0067] Next, in a tie bar fixing step (S03), the tie bar 18 that has passed through the link housing 16 is fixed to the link housing 16 using the tie bar fixing mechanism 32 ( FIG. 4 ). Specifically, by closing the half nut 70 using the tie bar fixing motor 72, the half nut 70 is fitted into the groove at the tip of the tie bar 18, and the tie bar 18 is fixed to the link housing 16.

[0068] Next, in a mold clamping step (S04), mold clamping is performed using the toggle mechanism 24 (FIG. 5). A mold clamping force is applied between the fixed mold 20 and the movable mold 22. The mold clamping stroke is, for example, 1 mm or more and 10 mm or less.

[0069] Next, in an injection operation step (S05), an injection operation is performed using the injection device 34 (FIG. 6). Specifically, for example, a ladle (not shown) or the like is used to supply the molten metal into the sleeve 74 from the opening 82. Then, the plunger tip 76a is advanced within the sleeve 74 to fill the molten metal into the cavity Ca in the die. The molten metal filled into the cavity Ca in the die is clamped, thereby producing a die-cast product 99.

[0070] Next, in a mold opening step (S06), the mold is opened using the toggle mechanism 24 (FIG. 7). The mold opening stroke is, for example, 1 mm or more and 10 mm or less. The distance between the link housing 16 and the movable die plate 14 is narrowed by a distance corresponding to the mold clamping stroke.

[0071] Next, in a tie bar releasing step (S07), the tie bar 18 fixed to the link housing 16 is released using the tie bar fixing mechanism 32 ( FIG. 8 ). Specifically, the tie bar 18 is released from the link housing 16 by opening the half nuts 70 using the tie bar fixing motor 72.

[0072] Next, in a movable die plate retraction step (S08), the link housing 16 and the movable die plate 14 are retracted in the mold opening direction (FIG. 9). The link housing 16 and the movable die plate 14 are moved by using the toggle movement mechanism 28. The tie bars 18 are pulled out from the link housing 16.

[0073] Next, in an ejection step (S09), the die-cast product 99 is ejected using the ejection mechanism 30 (FIG. 10). Specifically, the ejection plate 56 is moved in the mold closing direction by the ejection motor 66. As the ejection plate 56 moves in the mold closing direction, the ejection pins 64 move in the mold closing direction, and the die-cast product 99 is ejected from the movable mold 22. The die-cast product 99 ejected from the movable mold 22 is picked up, for example, by a robot arm (not shown).

[0074] Next, in a push-out return step (S10), the push-out plate 56 is returned to its initial position (FIG. 11). Specifically, the push-out motor 66 moves the push-out plate 56 in the mold opening direction.

[0075] The above molding operation produces the die-cast product 99. To produce the next die-cast product 99, the above molding operation can be repeated.

[0076] The movable die plate retraction step (S08), the push-out step (S09), and the push-out return step (S10) may be performed in parallel to shorten the molding cycle time. The movable die plate retraction step (S08) uses the toggle movement mechanism 28, and the push-out step (S09) and the push-out return step (S10) use a push-out mechanism 30 different from the toggle movement mechanism 28. The toggle movement mechanism 28 uses the toggle movement motor 50 as a power source, and the push-out mechanism 30 uses a push-out motor 66 different from the toggle movement motor 50 as a power source. Therefore, it is possible to perform the movable die plate retraction step (S08), the push-out step (S09), and the push-out return step (S10) in parallel.

[0077] Next, the operation and effects of the molding machine of the first embodiment will be described.

[0078] In die casting machines, it is desirable to simplify the structure of the die casting machine and shorten the molding cycle time in order to reduce the manufacturing costs of die cast products.

[0079] The die casting machine 100 of the first embodiment uses a toggle movement mechanism 28 to move the movable die plate 14 and the link housing 16 and stop the movable die 22 just before or after it comes into contact with the fixed die 20. Therefore, the stroke of the toggle mechanism 24 is sufficient as long as the stroke for die clamping is ensured. The stroke for die clamping is, for example, 10 mm or less. Therefore, the toggle mechanism 24 can be made smaller, and the stroke of the toggle mechanism 24 can be kept small. This allows the structure of the die casting machine 100 to be simplified.

[0080] Furthermore, by making the link housing 16 movable by the toggle movement mechanism 28, it is possible to shorten the length of the tie bars 18. Therefore, the structure of the die casting machine 100 can be simplified.

[0081] Furthermore, the die casting machine 100 uses a hydraulic actuator for the toggle mechanism 24. By using a hydraulic actuator, the cost of the actuator can be reduced compared to the case where an electric motor is used.

[0082] (Modification) The molding machine of the modified example of the first embodiment differs from the molding machine of the first embodiment in that the tie bars are fixed to the link housing.

[0083] Fig. 12 is a schematic diagram showing the overall configuration of a molding machine according to a modified example of the first embodiment, which corresponds to Fig. 1 of the first embodiment.

[0084] The molding machine of the modified example of the first embodiment is a die-casting machine 101. The die-casting machine 101 of the modified example of the first embodiment is a cold chamber type die-casting machine.

[0085] The tie bars 18 can be fixed to the link housing 16 and the fixed die plate 12. The tie bars 18 are fixed to the link housing 16 by tie bar nuts 19. The tie bars 18 pass through the movable die plate 14. The tie bars 18 can slide relative to the movable die plate 14 and the fixed die plate 12.

[0086] The fixed die plate 12 is provided with a tie bar fixing mechanism 32. The tie bars 18 can be fixed or unlocked (released) relative to the fixed die plate 12 by using the tie bar fixing mechanism 32. The tie bar fixing mechanism 32 fixes the tie bars 18 at a desired position.

[0087] For example, a saw-like groove is provided on the tip of the tie bar 18 on the side of the fixed die plate 12. The tie bar fixing mechanism 32 controls the opening and closing of the half nuts 70, for example, by a tie bar fixing motor 72. For example, by closing the half nuts 70, the half nuts 70 are fitted into the grooves at the tip of the tie bar 18, and the tie bar 18 is fixed to the fixed die plate 12.

[0088] The tie bars 18 support the clamping force while the clamping force is applied to the fixed mold 20 and the movable mold 22 .

[0089] The tie bars 18 are fixed to the link housing 16, and when the link housing 16 and the fixed die plate 12 are at the position where they are furthest apart, the ends of the tie bars 18 on the side of the fixed die plate 12 are located closer to the movable die plate 14 than the fixed die plate 12. When the link housing 16 and the fixed die plate 12 are at the position where they are furthest apart, the ends of the tie bars 18 on the side of the fixed die plate 12 are located between the fixed die plate 12 and the movable die plate 14.

[0090] In the die casting machine 101, by shortening the length of the tie bars 18, a space can be secured between the fixed die plate 12 and the end of the tie bars 18 on the side of the fixed die plate 12 when the die is in the initial state where the die is fully opened. This space can be used to attach and detach the die, and for example, it becomes unnecessary to install a tie bar pull-out device for attaching and detaching the die. Therefore, the structure of the die casting machine 101 can be further simplified.

[0091] As described above, according to the first embodiment and the modified examples, the structure of the die casting machine can be simplified.

[0092] Second embodiment The molding machine of the second embodiment differs from the molding machine of the first embodiment in that the actuator is incorporated in the crosshead and includes a cylinder tube and a rod that is partly provided in the cylinder tube and can move in a direction perpendicular to the mold opening and closing direction. In the following, some of the contents that overlap with the first embodiment may be omitted.

[0093] Fig. 13 is a schematic diagram showing the overall configuration of a molding machine according to a second embodiment, and is a side view including a partial cross-sectional view.

[0094] The molding machine of the second embodiment is a die-casting machine 200. The die-casting machine 200 of the second embodiment is a cold chamber type die-casting machine.

[0095] 13 shows an initial state before the start of operation of the die casting machine 200. The initial state in this case is a state in which the die is fully open, that is, a so-called die open limit state.

[0096] The die-casting machine 200 is a machine that manufactures die-cast products by injecting liquid metal (molten metal) into the interior of a die (cavity Ca in FIG. 13) and solidifying the liquid metal inside the die. The metal is, for example, aluminum, an aluminum alloy, a zinc alloy, or a magnesium alloy.

[0097] The die casting machine 200 includes a base 10, a fixed die plate 12, a movable die plate 14, a link housing 16, a tie bar 18, a tie bar nut 19, a fixed mold 20, a movable mold 22, a toggle mechanism 24, a hydraulic actuator 26 (actuator), a toggle moving mechanism 28, an extrusion mechanism 30, a tie bar fixing mechanism 32 (fixing mechanism), an injection device 34, and an input display device 36.

[0098] The toggle mechanism 24 includes a crosshead 44 and a plurality of links 46. The crosshead 44 includes a first portion 44a and a second portion 44b.

[0099] The hydraulic actuator 26 includes a hydraulic cylinder tube 26a (cylinder tube), a hydraulic piston 26b, and a hydraulic rod 26c (rod).

[0100] The toggle movement mechanism 28 includes a toggle movement motor 50, a screw shaft 52, a nut portion 54, and a guide rail 55. The toggle movement motor 50 is an electric motor.

[0101] The push-out mechanism 30 includes a push-out plate 56 , a push-out shaft 60 , a pin support plate 62 , a push-out pin 64 , and a push-out motor 66 .

[0102] The tie bar fixing mechanism 32 includes a half nut 70 and a tie bar fixing motor 72 .

[0103] The injection device 34 includes a sleeve 74, a plunger 76, an injection drive unit 78, and a position sensor 80. The plunger 76 includes a plunger tip 76a and a plunger rod 76b. The sleeve 74 is provided with an opening 82.

[0104] The fixed die plate 12 is fixed on the base 10. A fixed die 20 can be attached to the fixed die plate 12.

[0105] The movable die plate 14 is provided on the base 10 so as to be movable in the mold opening and closing direction. The mold opening and closing direction means both the mold opening direction and the mold closing direction shown in Fig. 13 and the like. The movable die plate 14 moves in the mold opening and closing direction on a guide rail 55 provided on the base 10. A movable die 22 can be attached to the movable die plate 14.

[0106] The link housing 16 is provided on the base 10 so as to be movable in the mold opening and closing direction. The link housing 16 moves in the mold opening and closing direction on a guide rail 55 provided on the base 10. One end of some of the multiple links 46 is fixed to the link housing 16.

[0107] The toggle mechanism 24 is provided between the link housing 16 and the movable die plate 14. One end of a portion of the multiple links 46 is fixed to the link housing 16. Also, one end of another portion of the multiple links 46 is fixed to the movable die plate 14.

[0108] The toggle mechanism 24 changes the distance between the link housing 16 and the movable die plate 14. The amount of change in the distance between the link housing 16 and the movable die plate 14 is, for example, 2 mm or more and 10 mm or less.

[0109] The toggle mechanism 24 enables the fixed mold 20 and the movable mold 22 to be clamped together.

[0110] The toggle mechanism 24 is driven by a hydraulic actuator 26. The hydraulic actuator 26 includes a hydraulic cylinder tube 26a, a hydraulic piston 26b, and a hydraulic rod 26c. The hydraulic actuator 26 is assembled to the crosshead 44.

[0111] The crosshead 44 includes a first portion 44a and a second portion 44b. The first portion 44a and the second portion 44b face each other in a direction perpendicular to the mold opening / closing direction. The first portion 44a and the second portion 44b are spaced apart from each other in the direction perpendicular to the mold opening / closing direction.

[0112] The first portion 44a is connected to one of the plurality of links 46, and the second portion 44b is connected to another of the plurality of links 46.

[0113] The hydraulic cylinder tube 26a is fixed to a first portion 44a of the crosshead 44. The hydraulic piston 26b is provided in the hydraulic cylinder tube 26a and is movable in a direction perpendicular to the mold opening / closing direction. One end of a hydraulic rod 26c is fixed to the hydraulic piston 26b and the other end is fixed to a second portion 44b of the crosshead 44. The hydraulic rod 26c is movable in a direction perpendicular to the mold opening / closing direction.

[0114] The hydraulic rod 26c moves in a direction perpendicular to the mold opening / closing direction, thereby increasing or decreasing the distance between the first part 44a and the second part 44b of the crosshead 44 in the direction perpendicular to the mold opening / closing direction. The increase or decrease in the distance between the first part 44a and the second part 44b of the crosshead 44 operates the multiple links 46, and the movable die plate 14 moves in the mold opening / closing direction relative to the link housing 16.

[0115] The tie bars 18 extend in the mold opening / closing direction. For example, four tie bars 18 are provided.

[0116] The tie bars 18 can be fixed to the link housing 16 and the fixed die plate 12. The tie bars 18 are fixed to the fixed die plate 12 by tie bar nuts 19. The tie bars 18 pass through the movable die plate 14. The tie bars 18 can slide relative to the movable die plate 14 and the link housing 16.

[0117] The link housing 16 is provided with a tie bar fixing mechanism 32. The tie bar 18 can be fixed or unlocked (released) relative to the link housing 16 using the tie bar fixing mechanism 32. The tie bar fixing mechanism 32 fixes the tie bar 18 in a desired position.

[0118] For example, a saw-like groove is provided on the tip of the tie bar 18 on the side of the link housing 16. The tie bar fixing mechanism 32 controls the opening and closing of the half nuts 70, for example, by a tie bar fixing motor 72. For example, by closing the half nuts 70, the half nuts 70 are fitted into the grooves on the tip of the tie bar 18, and the tie bar 18 is fixed to the link housing 16.

[0119] The tie bars 18 support the clamping force while the clamping force is applied to the fixed mold 20 and the movable mold 22 .

[0120] The tie bars 18 are fixed to the fixed die plate 12, and when the link housing 16 and the fixed die plate 12 are at the farthest position, the ends of the tie bars 18 on the link housing 16 side are located closer to the movable die plate 14 than the link housing 16. When the link housing 16 and the fixed die plate 12 are at the farthest position, the ends of the tie bars 18 on the link housing 16 side are located between the link housing 16 and the movable die plate 14.

[0121] The toggle movement mechanism 28 moves the movable die plate 14 and the link housing 16 in the mold opening and closing direction. The toggle movement mechanism 28 moves the movable die plate 14 and the link housing 16 using a toggle movement motor 50.

[0122] The nut portion 54 is fixed to the link housing 16. The toggle movement motor 50 rotates the screw shaft 52, causing the nut portion 54 to move in the mold opening / closing direction. As the nut portion 54 moves in the mold opening / closing direction, the link housing 16 fixed to the nut portion 54 and the movable die plate 14 connected to the link housing 16 by the multiple links 46 move in the mold opening / closing direction. The link housing 16 and the movable die plate 14 move on guide rails 55.

[0123] The ejection mechanism 30 includes an ejection plate 56, an ejection shaft 60, a pin support plate 62, an ejection pin 64, and an ejection motor 66. The ejection mechanism 30 has a function of ejecting the manufactured die-cast product from the die and separating it.

[0124] The ejection plate 56 is provided between the crosshead 44 and the movable die plate 14. One end of an ejection shaft 60 extending in the mold closing direction is fixed to the ejection plate 56. The ejection shaft 60 penetrates the movable die plate 14. The ejection shaft 60 is slidable relative to the movable die plate 14.

[0125] The other end of the push shaft 60 is fixed to a pin support plate 62. A push pin 64 is fixed to the pin support plate 62. The push pin 64 is fixed to the push plate 56 relatively.

[0126] The ejection pin 64 is provided so as to be able to appear and disappear from the movable mold 22. The ejection pin 64 extends in the mold closing direction. For example, a plurality of ejection pins 64 are provided.

[0127] The ejection plate 56 can be moved in the mold opening / closing direction by the ejection motor 66. When the ejection plate 56 moves in the mold opening / closing direction, the ejection pins 64 move in the mold opening / closing direction.

[0128] The injection device 34 has a function of injecting liquid metal into a cavity Ca inside the mold. The injection device 34 has a sleeve 74, a plunger 76, an injection drive unit 78, and a position sensor 80. The plunger 76 includes a plunger tip 76a and a plunger rod 76b. The sleeve 74 is provided with an opening 82.

[0129] The sleeve 74 communicates with the inside of the fixed mold 20. The sleeve 74 is, for example, a tubular member connected to the fixed mold 20. The sleeve 74 is, for example, cylindrical in shape.

[0130] The plunger 76 slides inside the sleeve 74. A plunger tip 76a fixed to the tip of a plunger rod 76b slides in the front-rear direction inside the sleeve 74. As the plunger tip 76a slides forward inside the sleeve 74, the molten metal in the sleeve 74 is filled into a cavity Ca formed by the fixed die 20 and the movable die 22.

[0131] The injection drive unit 78 has a function of driving the plunger 76 in the forward and backward directions. The injection drive unit 78 is, for example, a hydraulic type, an electric type, or a hybrid type that combines the hydraulic type and the electric type.

[0132] The position sensor 80 has a function of detecting the position of the plunger 76. The position sensor 80 is, for example, an optical or magnetic linear encoder. By differentiating the position of the plunger 76 detected by the position sensor 80, it is possible to detect the speed of the plunger 76.

[0133] The input display device 36 is provided on, for example, the fixed die plate 12. The input display device 36 accepts, for example, an input operation from an operator. The operator can set molding conditions and the like of the die casting machine 200 using the input display device 36. In addition, the input display device 36 displays, for example, the molding conditions and operating status of the die casting machine 200 on a screen. The input display device 36 is, for example, a liquid crystal display or an organic EL display.

[0134] Next, the molding operation using the molding machine of the second embodiment will be described with reference to Fig. 13 to Fig. 23. Fig. 14 is a flow diagram of the molding operation of the molding machine of the second embodiment. Fig. 15 to Fig. 23 are explanatory diagrams of the molding operation using the molding machine of the second embodiment. Fig. 15 to Fig. 23 are diagrams corresponding to Fig. 13.

[0135] As shown in FIG. 14, the molding operation of the die-casting machine 200 of the second embodiment includes an initial state step (S01), a movable die plate advance step (S02), a tie-bar fixing step (S03), a mold clamping step (S04), an injection operation step (S05), a mold opening step (S06), a tie-bar releasing step (S07), a movable die plate retreat step (S08), an extrusion step (S09), and an extrusion return step (S10).

[0136] First, the die casting machine 200 is in an initial state step (S01) (FIG. 13). The initial state is a so-called die open limit state.

[0137] Next, in a movable die plate advancement step (S02), the link housing 16 and the movable die plate 14 are advanced in the mold closing direction (FIG. 15). The link housing 16 and the movable die plate 14 are moved using a toggle movement mechanism 28. The link housing 16 and the movable die plate 14 are advanced, for example, until just before the movable die 22 comes into contact with the fixed die 20.

[0138] After the link housing 16 and the movable die plate 14 stop, the distance between the fixed die 20 and the movable die 22 is, for example, 0.5 mm or more and 2 mm or less. The fixed die 20 and the movable die 22 may be in contact with each other.

[0139] Next, in a tie bar fixing step (S03), the tie bar 18 that has passed through the link housing 16 is fixed to the link housing 16 using the tie bar fixing mechanism 32 ( FIG. 16 ). Specifically, by closing the half nut 70 using the tie bar fixing motor 72, the half nut 70 is fitted into the groove at the tip of the tie bar 18, and the tie bar 18 is fixed to the link housing 16.

[0140] Next, in a mold clamping step (S04), the mold is clamped using the toggle mechanism 24 (FIG. 17). Using a hydraulic device (not shown), hydraulic oil is supplied into the hydraulic cylinder tube 26a to move the hydraulic piston 26b in a direction perpendicular to the mold opening / closing direction.

[0141] By moving the hydraulic piston 26b in a direction perpendicular to the mold opening / closing direction, the hydraulic rod 26c moves in a direction perpendicular to the mold opening / closing direction, and the distance between the first part 44a and the second part 44b of the crosshead 44 increases. By increasing the distance between the first part 44a and the second part 44b of the crosshead 44, the toggle mechanism 24 is driven, and the distance between the link housing 16 and the movable die plate 14 increases.

[0142] By increasing the distance between the link housing 16 and the movable die plate 14, a mold clamping force is applied between the fixed die 20 and the movable die 22. The mold clamping stroke is, for example, 1 mm or more and 10 mm or less.

[0143] Next, in an injection operation step (S05), an injection operation is performed using the injection device 34 (FIG. 18). Specifically, for example, a ladle (not shown) or the like is used to supply molten metal into the sleeve 74 from the opening 82. Then, the plunger tip 76a is advanced within the sleeve 74 to fill the molten metal into the cavity Ca in the die. The molten metal filled into the cavity Ca in the die is clamped, thereby producing a die-cast product 99.

[0144] Next, in a mold opening step (S06), the mold is opened using the toggle mechanism 24 (FIG. 19). The mold opening stroke is, for example, 1 mm or more and 10 mm or less. The distance between the link housing 16 and the movable die plate 14 is narrowed by a distance corresponding to the mold clamping stroke.

[0145] Next, in a tie bar releasing step (S07), the tie bar 18 fixed to the link housing 16 is released using the tie bar fixing mechanism 32 ( FIG. 20 ). Specifically, the tie bar 18 is released from the link housing 16 by opening the half nuts 70 using the tie bar fixing motor 72.

[0146] Next, in a movable die plate retraction step (S08), the link housing 16 and the movable die plate 14 are retracted in the mold opening direction (FIG. 21). The link housing 16 and the movable die plate 14 are moved by using the toggle movement mechanism 28. The tie bars 18 are pulled out from the link housing 16.

[0147] Next, in an ejection step (S09), the die-cast product 99 is ejected using the ejection mechanism 30 (FIG. 22). Specifically, the ejection plate 56 is moved in the mold closing direction by the ejection motor 66. As the ejection plate 56 moves in the mold closing direction, the ejection pins 64 move in the mold closing direction, and the die-cast product 99 is ejected from the movable mold 22. The die-cast product 99 ejected from the movable mold 22 is picked up by, for example, a robot arm (not shown).

[0148] Next, in a push-out return step (S10), the push-out plate 56 is returned to its initial position (FIG. 23). Specifically, the push-out motor 66 moves the push-out plate 56 in the mold opening direction.

[0149] The above molding operation produces the die-cast product 99. To produce the next die-cast product 99, the above molding operation can be repeated.

[0150] The movable die plate retraction step (S08), the push-out step (S09), and the push-out return step (S10) may be performed in parallel to shorten the molding cycle time. The movable die plate retraction step (S08) uses the toggle movement mechanism 28, and the push-out step (S09) and the push-out return step (S10) use a push-out mechanism 30 different from the toggle movement mechanism 28. The toggle movement mechanism 28 uses the toggle movement motor 50 as a power source, and the push-out mechanism 30 uses a push-out motor 66 different from the toggle movement motor 50 as a power source. Therefore, it is possible to perform the movable die plate retraction step (S08), the push-out step (S09), and the push-out return step (S10) in parallel.

[0151] Next, the operation and effects of the molding machine of the second embodiment will be described.

[0152] In die casting machines, it is desirable to simplify the structure of the die casting machine and shorten the molding cycle time in order to reduce the manufacturing costs of die cast products.

[0153] The die casting machine 200 of the second embodiment uses a toggle movement mechanism 28 to move the movable die plate 14 and the link housing 16 and stop the movable die 22 just before or after it comes into contact with the fixed die 20. Therefore, the stroke of the toggle mechanism 24 is sufficient as long as the stroke for die clamping is ensured. The stroke for die clamping is, for example, 10 mm or less. Therefore, the toggle mechanism 24 can be made smaller, and the stroke of the toggle mechanism 24 can be kept small. This allows the structure of the die casting machine 200 to be simplified.

[0154] In the die casting machine 200 of the second embodiment, the hydraulic actuator 26 is incorporated in the crosshead 44. The hydraulic rod 26c of the hydraulic actuator 26 is configured to move in a direction perpendicular to the mold opening / closing direction. Therefore, for example, the width of the hydraulic actuator 26 in the mold opening / closing direction can be reduced. This allows the structure of the die casting machine 200 to be simplified.

[0155] Furthermore, by making the link housing 16 movable by the toggle movement mechanism 28, it is possible to shorten the length of the tie bars 18. Therefore, the structure of the die casting machine 200 can be simplified.

[0156] Furthermore, the die casting machine 200 uses a hydraulic actuator for the toggle mechanism 24. By using a hydraulic actuator, the cost of the actuator can be reduced compared to the case where an electric motor is used.

[0157] (First Modification) The molding machine of the first modified example of the second embodiment differs from the molding machine of the second embodiment in that the tie bars are fixed to the link housing.

[0158] Fig. 24 is a schematic diagram showing the overall configuration of a molding machine according to a first modified example of the second embodiment, which corresponds to Fig. 13 of the second embodiment.

[0159] The molding machine of the second modified example of the second embodiment is a die-casting machine 201. The die-casting machine 201 of the second modified example of the second embodiment is a cold chamber type die-casting machine.

[0160] The tie bars 18 can be fixed to the link housing 16 and the fixed die plate 12. The tie bars 18 are fixed to the link housing 16 by tie bar nuts 19. The tie bars 18 pass through the movable die plate 14. The tie bars 18 can slide relative to the movable die plate 14 and the fixed die plate 12.

[0161] The fixed die plate 12 is provided with a tie bar fixing mechanism 32. The tie bars 18 can be fixed or unlocked (released) relative to the fixed die plate 12 by using the tie bar fixing mechanism 32. The tie bar fixing mechanism 32 fixes the tie bars 18 at a desired position.

[0162] For example, a saw-like groove is provided on the tip of the tie bar 18 on the side of the fixed die plate 12. The tie bar fixing mechanism 32 controls the opening and closing of the half nuts 70, for example, by a tie bar fixing motor 72. For example, by closing the half nuts 70, the half nuts 70 are fitted into the grooves at the tip of the tie bar 18, and the tie bar 18 is fixed to the fixed die plate 12.

[0163] The tie bars 18 support the clamping force while the clamping force is applied to the fixed mold 20 and the movable mold 22 .

[0164] The tie bars 18 are fixed to the link housing 16, and when the link housing 16 and the fixed die plate 12 are at the position where they are furthest apart, the ends of the tie bars 18 on the side of the fixed die plate 12 are located closer to the movable die plate 14 than the fixed die plate 12. When the link housing 16 and the fixed die plate 12 are at the position where they are furthest apart, the ends of the tie bars 18 on the side of the fixed die plate 12 are located between the fixed die plate 12 and the movable die plate 14.

[0165] In the die casting machine 201, by shortening the length of the tie bars 18, a space can be secured between the fixed die plate 12 and the end of the tie bars 18 on the side of the fixed die plate 12 when the die is in the initial state where the die is fully opened. This space can be used to attach and detach the die, and for example, it is not necessary to install a tie bar pull-out device for attaching and detaching the die. Therefore, the structure of the die casting machine 201 can be simplified.

[0166] (Second Modification) The molding machine of the second modified example of the second embodiment differs from the molding machine of the second embodiment in that the actuator is an electric actuator.

[0167] Fig. 25 is a schematic diagram showing the overall configuration of a molding machine according to a second modified example of the second embodiment, which corresponds to Fig. 13 of the second embodiment.

[0168] The molding machine of the second modified example of the second embodiment is a die-casting machine 202. The die-casting machine 202 of the second modified example of the second embodiment is a cold chamber type die-casting machine.

[0169] A die casting machine 202 according to a second modified example of the second embodiment includes an electric actuator 96 instead of the hydraulic actuator 26 of the die casting machine 200 according to the second embodiment.

[0170] The electric actuator 96 is incorporated into the crosshead 44. The crosshead 44 includes a first portion 44a and a second portion 44b. The first portion 44a and the second portion 44b face each other in a direction perpendicular to the mold opening and closing direction.

[0171] The first portion 44a is connected to one of the plurality of links 46, and the second portion 44b is connected to another of the plurality of links 46.

[0172] The electric actuator 96 includes an electric cylinder tube 96a (cylinder tube) and an electric rod 96b (rod). The electric cylinder tube 96a includes, for example, an electric motor (not shown).

[0173] The electric cylinder tube 96a is fixed to a first portion 44a of the crosshead 44. One end of the electric rod 96b is fixed to a second portion 44b of the crosshead 44. The electric rod 96b is movable in a direction perpendicular to the mold opening / closing direction by driving an electric motor in the electric cylinder tube 96a.

[0174] The electric rod 96b moves in a direction perpendicular to the mold opening / closing direction, thereby increasing or decreasing the distance between the first portion 44a and the second portion 44b of the crosshead 44 in the direction perpendicular to the mold opening / closing direction. The increase or decrease in the distance between the first portion 44a and the second portion 44b of the crosshead 44 operates the multiple links 46, and the movable die plate 14 moves in the mold opening / closing direction relative to the link housing 16.

[0175] As described above, according to the second embodiment and the modified example, the structure of the die casting machine can be simplified.

[0176] The above describes the embodiments of the present invention with reference to specific examples. However, the present invention is not limited to these specific examples. In the embodiments, the description of the molding machine and other parts that are not directly necessary for the description of the present invention is omitted, but the necessary elements related to the molding machine and other parts can be appropriately selected and used.

[0177] In the first and second embodiments, a die-casting machine has been described as an example of a molding machine, but the present invention can also be applied to an injection molding machine or the like.

[0178] In addition, all water heaters and molding machines that incorporate the elements of the present invention and that can be appropriately modified by those skilled in the art are included in the scope of the present invention. The scope of the present invention is defined by the claims and their equivalents. [Explanation of symbols]

[0179] 10 Base 12 Fixed die plate 14 Movable die plate 16 Link housing 18 Tie bar 19 Tie bar nut 20 Fixed mold 22 Movable mold 24 Toggle Mechanism 26 Hydraulic actuator (actuator) 26a Hydraulic cylinder tube (cylinder tube) 26b Hydraulic piston 26c Hydraulic rod (rod) 28 Toggle movement mechanism 30 Extrusion mechanism 32 Tie bar fixing mechanism (fixing mechanism) 34 Injection device 36 Input display device 44 Crosshead 44a First Part 44b Second Part 46 Links 50 Toggle movement motor (motor) 52 Screw shaft 54 Nut part 55 Guide rail 56 Extrusion Plate 60 Extrusion shaft 62 Pin support plate 64 ejector pin 66 Extrusion motor 70 Half Nut 72 Tie bar fixed motor 74 Sleeve 76 Plunger 76a Plunger Tip 76b Plunger rod 78 Injection drive unit 80 Position Sensor 82 Opening 96 Electric Actuator (Actuator) 96a Electric cylinder tube (cylinder tube) 96b Electric rod (rod) 99 Die-cast products 100 Die casting machine (molding machine) 200 Die casting machine (molding machine) Ca cavity

Claims

1. With the base, a stationary die plate fixed on the base and holding a stationary die; a movable die plate provided on the base so as to be movable in a die opening / closing direction and configured to hold a movable die facing the fixed die; a toggle mechanism capable of clamping the fixed mold and the movable mold and having a crosshead and a plurality of links; a link housing provided on the base so as to be movable in the mold opening / closing direction, the link housing having one ends of some of the plurality of links fixed thereto; An actuator that drives the toggle mechanism; a motor for moving the movable die plate and the link housing; a tie bar that can be fixed to the link housing and the fixed die plate and extends in the die opening / closing direction; an injection device that fills a molten metal into a cavity formed by the fixed die and the movable die; A molding machine comprising:

2. 2. The molding machine according to claim 1, wherein the actuator is a hydraulic actuator.

3. 3. The molding machine according to claim 2, wherein the actuator includes a cylinder tube fixed to the link housing, a piston provided in the cylinder tube and movable in the mold opening / closing direction, and a rod having one end fixed to the piston and the other end fixed to the crosshead.

4. 4. The molding machine according to claim 3, wherein the amount of displacement of the gap between the link housing and the movable die plate is 10 mm or less.

5. 2. The molding machine according to claim 1, wherein the actuator is incorporated in the crosshead and includes a cylinder tube and a rod having a portion disposed within the cylinder tube and movable in a direction perpendicular to the mold opening / closing direction.

6. the crosshead has a first portion connected to one of the plurality of links and a second portion connected to another of the plurality of links; 6. The molding machine according to claim 5, wherein said cylinder tube is fixed to said first portion and said rod is fixed to said second portion.

7. 7. The molding machine according to claim 5, wherein the actuator is a hydraulic actuator.

8. 7. The molding machine according to claim 5, wherein the actuator is an electric actuator.

9. 6. The molding machine according to claim 5, wherein the amount of displacement of the gap between the link housing and the movable die plate is 10 mm or less.

10. 2. The molding machine according to claim 1, wherein the tie bar is fixed to either the link housing or the fixed die plate and is slidable relative to the other.

11. 11. The molding machine according to claim 10, further comprising a fixing mechanism for fixing the other of the tie bars at a desired position.

12. 2. The molding machine according to claim 1, wherein the tie bars are fixed to the fixed die plate, and at the position where the link housing and the fixed die plate are furthest apart, the ends of the tie bars on the link housing side are located closer to the movable die plate than the link housing.

13. 2. The molding machine according to claim 1, wherein the tie bars are fixed to the link housing, and at the position where the link housing and the fixed die plate are furthest apart, the ends of the tie bars on the side of the fixed die plate are located closer to the movable die plate than the fixed die plate.

Images