JP2000263214A - Mold opening and closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the dropping in the case of separating a molded product from a mold and the deformation and the damage to the molded product from happening. SOLUTION: A mold opening/closing device 2 used for this casting method, is held of a fixed mold having a cavity for forming the molded product and a movable mold 11 and horizontally shifts the movable mold 11 in the mold opening/closing direction. Further, this mold opening/closing device 2 is provided with a main body 21, a fixed board for holding the fixed mold, a movable board 23 horizontally movable in the mold opening/closing direction, a main driving source 26 horizontally shifting the movable board 23 in the mold opening/closing direction, a swing plate 25 for holding the movable mold 11 by arranging so as to be vertically swingable in the movable board 23 and a swing driving source 27 for turning the movable mold 11 held with the swing plate 25 under vertical state to the horizontal state by vertically swinging the swing plate 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold opening / closing apparatus for holding a fixed mold and a movable mold having a cavity for molding a molded product and moving the movable mold in the mold opening / closing direction.

[0002]

2. Description of the Related Art Conventionally, a mold opening / closing device has a function of holding a fixed mold and a movable mold having a cavity for molding a molded product and moving the movable mold in the mold opening / closing direction (Japanese Unexamined Patent Publication (Kokai) No. Heisei 3-3-1). No. 146249). Then, after the movable mold is laterally moved and the mold is opened, the extrusion pin of the extrusion mechanism for extruding the molded article is actuated to extrude the molded article and release it from the cavity mold surface of the molding die.

[0003]

However, the extruded molded product may fall from the molding die to the floor or the like, and may be deformed or damaged by the impact of the fall. In particular, bismuth-based metals, tin-based metals, bismuth-
In the case of a cast product formed of a low melting point metal (high specific gravity material) such as a tin-based metal, the impact resistance is inferior, so that the cast product is greatly deformed or damaged when dropped.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a mold opening / closing device capable of preventing a molded article from dropping during mold release and preventing deformation and damage of the molded article. As an issue.

[0005]

SUMMARY OF THE INVENTION A mold opening and closing apparatus according to the present invention is a mold opening and closing apparatus for holding a fixed mold and a movable mold having a cavity for molding a molded product and moving the movable mold in the mold opening and closing direction. A main body, a fixed plate provided on the main body and holding the fixed mold, a movable plate provided on the main body and movable in a mold opening / closing direction, and a main body moving the movable plate in a mold opening / closing direction. A drive source, a turning plate provided on the movable plate so as to be capable of vertical turning and having a movable type holding portion for holding the movable type, and a vertical orientation held by the turning plate by vertically turning the turning plate. And a turning drive source for turning the movable mold in a vertical state to a horizontal state by turning the movable mold in a horizontal state.

According to the apparatus of the present invention, the movable plate in the vertical state held by the rotating plate is vertically rotated by turning the rotating plate vertically by the rotating drive source to be in the horizontal state. If the molded product is released from the cavity of the molding die while the movable die is in the horizontal state, the molded product is prevented from falling from the molding die with impact. After the molded product is released, the turning of the turning plate is returned.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the apparatus of the present invention, the following embodiments can be adopted. -A hydraulic cylinder device can be adopted as the turning drive source. The hydraulic cylinder device includes a hydraulic cylinder device and a pneumatic cylinder device. In some cases, a motor mechanism may be employed.

[0010] It is possible to adopt a structure in which a lock means for locking the turning plate to the movable plate in the non-turning state is provided. The locking means can be provided on at least one of the turning plate and the movable plate. A configuration in which an extruding mechanism having an extruding pin for releasing a molded product, which can protrude from the molding cavity mold surface of the movable die, can be adopted as the pivot plate.

[0010] A configuration may be adopted in which the pivot plate is provided with a stopper which can contact the movable platen and regulates the posture of the pivot plate in accordance with the contact. As a result, a stopper action when the turning is returned is obtained. A turning assist arm is attached to the turning plate so as to protrude from the turning plate, and the turning drive source is a fluid pressure pivotally supported by the first pivot portion on the movable plate so as to be swingable along the height direction. The cylinder body and the fluid pressure cylinder body are provided so as to be able to advance and retreat, and the distal end is provided with a second rotation assist arm.
A configuration including a cylinder rod pivotally supported by the pivot portion may be employed.

[0010] As the main body, it is possible to adopt a configuration including a fixed plate that holds a fixed die and a movable plate that can move laterally in the mold opening and closing direction. Further, as the main body, a tie bar-less system in which no tie bar is installed can be adopted instead of a tie bar system in which a tie bar for reinforcement is provided to increase the rigidity of the main body. -A die casting die, a gravity casting die, a low pressure casting die, a resin injection molding die, or the like can be used as a molding die. The material of the molded article formed by the molding die may be a metal material, a resin material, or a composite material containing a reinforcing material. Aluminum and iron can be used as the metal, and a low melting point metal (a material having a low melting point and a high specific gravity) such as a bismuth based metal, a tin based metal, a bismuth-tin based metal, and a lead based metal can be used. be able to.

[0011]

Embodiments of the present invention will be described with reference to the drawings. In this embodiment, as shown in FIG. 1, a casting mold 1 which is a mold is used as a molding die. The casting mold 1 includes a fixed mold 10 as a first split mold and a movable mold 11 as a second split mold. Casting mold 1
Has a cavity 13 and a gate 15 communicating with the cavity 13. The cavity 13 has a hollow shape,
This is for forming a low-melting metal casting. As the low melting point metal according to the present embodiment, bismuth-based, tin-based,
Bismuth-tin type can be adopted. These low melting point metals are low melting point high specific gravity metals having a lower melting point than the resin material and a higher specific gravity than the water-soluble oil.

In the casting mold 1, a casting method is set so that the vicinity of the gate 15 is the final solidified portion of the low melting point metal. The casting to be cast by the casting mold 1 is a metal core made of a low melting point metal for forming a hollow portion of a resin hollow tubular body (for example, a resin intake manifold mounted on an internal combustion engine of a vehicle). As shown in FIG. 1, the fixed mold 10 has a first cavity mold surface 10 a that divides the cavity 13. The movable mold 11 has a second cavity mold surface 11a that divides the cavity 13. The gate 15 is formed on the bottom side of the casting mold 1. The main reason is that the molten metal of the low melting point metal in the cavity 13 can be easily discharged to the outside of the cavity 13 through the gate 15 by utilizing gravity.

As shown in FIG. 1, a hot water supply nozzle portion 3 is attached to an attachment portion 2x of a mold opening and closing device 2 in a vertical arrangement so as to be located below and near a casting mold 1. The hot water supply nozzle section 3 has a vertical cylindrical body 32 having a contact nozzle 30 at the tip and a hot water supply chamber 31 therein, and is capable of moving forward (up) in the direction of arrow Y1 and retractable (lowering) in the direction of arrow Y2. ) Has a vertical shaft-shaped movable closing member 33 provided in the hot water supply chamber 31 of the cylindrical body 32. Hot water supply room 31 of cylindrical body 32
In the lower region, a molten metal supply port 36 to which a molten metal of a low melting point metal is supplied is formed.

As shown in FIG. 3, the contact nozzle 30 has a conical inner wall surface 30a forming a nozzle port 34 that can communicate with the gate 15 of the casting mold 1, and a conical outer wall surface 30b coaxial with the conical inner wall surface 30b. Have. The conical inner wall surface 30a and the conical outer wall surface 30b have an inclination whose diameter becomes smaller toward the tip. A closing part 35 capable of closing the nozzle port 34 is provided at the tip of the movable closing member 33. The closing portion 35 has a conical outer surface 35a whose outer diameter becomes smaller toward its tip.

As shown in FIG. 4, when the movable closing member 33 advances in the direction of the arrow Y1, the closing portion 35 of the movable closing member 33 moves.
Of the conical inner wall surface 30a of the nozzle port 34
And the closing part 35 of the movable closing member 33 is
4 is closed. As shown in FIG. 3, when the movable closing member 33 retreats in the direction of arrow Y2, the closing portion 3 of the movable closing member 33 is closed.
5 is the conical inner wall surface 30 of the nozzle port 34
a, that is, the closing portion 35 of the movable closing member 33 opens the nozzle port 34.

As shown in FIG. 1, below the movable closing member 33, there is provided a pneumatic cylinder 38 which operates with air which is more easily compressed than hydraulic oil. Pneumatic cylinder 3
By the operation of 8, the movable closing member 33 operates in the directions of arrows Y1 and Y2. The pneumatic cylinder 38 is operated by a pneumatic drive circuit 38c. As shown in FIG. 5, a molten metal holding unit 4 for holding a molten metal of a low melting point metal is provided near the mold opening and closing device 2. The molten metal holding part 4 has a storage chamber 40 for storing the molten metal of the low melting point metal, a separation tank 41 provided with a heat insulating material 41x, and a long pipe-shaped radiating pipe 4 laid near the bottom in the storage chamber 40.
2 is provided. The heat radiating pipe 42 is connected to the heat medium heating device 44, and a high temperature (target heating temperature: 160 to 190 ° C.) heat medium (eg, oil) heated by the heat medium heating device 44 flows through the heat radiating tube 42. Return to the heating medium heating device 44.

Based on the specific gravity difference, a water-soluble oil L1 having a low specific gravity is stored in the upper portion of the separation tank 41, and a molten metal L2 of a low melting point metal having a specific gravity heavier than the water-soluble oil L1 is stored in the bottom portion. ing. A resin molded product (injection molded product) integrally provided with a metal core, which is a cast product of a low melting metal, is immersed in the water-soluble oil L1 in the separation tank 41 together with the metal core. By this immersion, only the metal core is melted by the heat of the water-soluble oil L1 set at a temperature of 160 to 190 ° C., and a resin molded product of a predetermined shape from which the metal core has been removed is obtained. The molten metal L2 of the low melting point metal is stored near the bottom of the separation tank 41 based on the difference in specific gravity, is maintained in an appropriate temperature range (basically, 160 to 190 ° C.) by the heat radiation pipe 42, and is sucked into the supply pump 5 later. Then, it is subjected to casting by the casting mold 1. Therefore, the separation tank 41 according to the present embodiment has an elution function of eluting the low-melting-point metal by the heat of the water-soluble oil L1, a holding function of holding the molten low-melting-point metal L2 in an appropriate temperature range, and a function of holding the water-soluble oil L1. And the melt L2.

As shown in FIG. 5, a supply pump 5 as a molten metal supply section is provided between the molten metal supply nozzle section 3 and the molten metal holding section 4.
Are provided in a vertical arrangement. The supply pump 5 is a separation tank 4
1 is disposed outside. As shown in FIG. 1, the supply pump 5 includes a vertical metal supply cylinder 52 having a vertically long supply chamber 51 having a distal end opening 51x, and a vertically movable plunger 53 movably provided in the supply chamber 51. And Further, a hydraulic cylinder device 54 for operating the plunger 53 and a hydraulic drive circuit 54c for operating the hydraulic cylinder device 54 are provided. The plunger 53 has a metal piston 53a and a metal rod 53b. The stroke position of the plunger 53 is a sensor 53w.
(For example, a potentiometer). The control device 7 can measure the required pouring amount of the molten metal into the cavity 13 based on the detection signal from the sensor 53w indicating the stroke position of the plunger 53.

As shown in FIG. 1, the tip end opening 51x of the supply cylinder 52 of the supply pump 5 and the cylinder 3 of the hot water supply nozzle 3
The second molten metal supply port 36 is communicated with a first communication passage 57. The supply pump 5 and the discharge port 4r of the molten metal holding section 4 (FIG. 5)
(See FIG. 3) is connected to the second communication path 58. An on-off valve 59 is provided in the second communication passage 58. The on-off valve 59 is an electromagnetic valve, and is operated by a valve drive circuit 59c.

As can be understood from FIG. 1, the control device 7
It is connected to the pneumatic drive circuit 38c, the hydraulic drive circuit 54c, the valve drive circuit 59c, and the sensor 53w. Control device 7
Are connected to the pneumatic drive circuit 38c of the hot water supply nozzle unit 3 via the signal line 38p, to the hydraulic drive circuit 54c of the supply pump 5 via the signal line 54p, and to the open / close valve 59 via the signal line 59p.
And outputs a command signal to the valve drive circuit 59c.

FIG. 2 shows the details of the hot water supply nozzle section 3. FIG.
The internal structure of the hot water supply nozzle 3 will be described with reference to FIG. As shown in FIG. 2, the hot water supply room 3 of the metal cylinder 32 is provided.
A movable closing member 33 made of metal is provided substantially coaxially in 1. An electric heater 33t is provided on the wall of the cylindrical body 32 to heat the cylindrical body 32. Inside the movable closing member 33, a heat medium passage 6 through which a high-temperature heat medium heated by the heat medium heating device 44 flows is formed.

The movable closing member 33 has a vertical metal outer cylinder 33k having a closing portion 35 at the distal end, and a vertical metal metal cylinder inserted substantially coaxially into the outer cylinder 33k. It is composed of an inner cylinder 33m. 33m (the upper end) of the inner cylinder
A heating chamber 61 is formed between the outer cylinder 33k and the tip (upper end). The heating chamber 61 has a substantially conical hollow shape, and is located on the inner surface side of the closing portion 35 which is the tip of the outer cylinder 33k of the movable closing member 33. When the temperature of the heating chamber 61 becomes high, the vicinity of the closing portion 35 of the movable closing member 33 is effectively heated.

In the central region of the inner cylinder 33m of the movable closing member 33, a vertical central hole is formed along the axial direction.
This central hole is used as the outward path 60 of the heat medium passage 6. The outlet 60 s at the tip (upper end) of the outward path 60 faces the heating chamber 61. At the lower end of the outward path 60, a medium inlet 6i is formed. On the outer wall surface of the inner cylinder 33m, a groove 39 is formed in a spiral shape around the central axis of the inner cylinder 33m. This groove 3
9 has a spiral start end 39s and a spiral end 39e.

By inserting the inner cylinder 33m substantially coaxially into the outer cylinder 33k, a return path 62 of the heat medium passage 6 is formed by the spiral groove 39 and the inner wall surface of the outer cylinder 33k. At the lower end of the return path 62, a medium outlet 6r is formed. The medium outlet 6r and the medium inlet 6i are connected to the heat medium supply device 44 via a communication pipe 44x. As shown in FIG. 2, the heat medium flowing from the medium inlet 6i rises through the outward path 60 and is blown out from the outlet 60s of the outward path 60 into the heating chamber 61. The heat medium blown out from the outlet 60s is
With respect to the point 35u of the closing portion 35 of the movable closing member 33,
Hit directly from almost vertical direction. Therefore, the vicinity of the closing portion 35 of the movable closing member 33 is effectively heated. The heat medium blown out to the heating chamber 61 descends while turning vertically along the spiral return path 62, and flows out from the medium outlet 6r.

In this embodiment, since the forward path 60 is straight and the return path 62 is spiral, the heating chamber 61
The heating medium flowing into the heating chamber 61 can be retained in the heating chamber 61. Therefore, the heating chamber 61 can be sufficiently filled with a high-temperature heat medium, and the closing portion 35 can be efficiently heated. As shown in FIG. 2, the elevating body 67 includes a first panel 6.
7a, the second panel part 67b and the bridge shaft part 67 connecting them
c. The hot water supply nozzle 3 is held by the elevating body 67 so as to be able to move up and down integrally. Elevating cylinder 67e
Is held by the mold opening / closing device 2, and the elevating cylinder 67e
Is connected to the elevating body 67. When the rod 67m of the elevating cylinder 67e operates, the hot water supply nozzle 3 moves up and down along the directions of the arrows Y1 and Y2 together with the elevating body 67. As a result, the contact nozzle 30 of the hot water supply nozzle unit 3 is
Can be attached to and detached from the gate 15.

As shown in FIG. 5, the mold opening / closing device 2 has fixing brackets 21e and 21f that can function as fixing portions, and also functions as a base having a guide surface 20 extending along the lateral direction between them. Main body 21 and main body 2
1 and a vertical fixed die base 22 functioning as a fixed plate provided on a fixed bracket 21e on one end side, and a vertical fixed die base 22 functioning as a movable plate provided on a fixed bracket 21f side on the other end side of the main body 21. A movable die base 23;
A turning plate 25 held on a movable die base 23,
A main hydraulic cylinder device 26 functioning as a main drive source provided on a fixed bracket 21f on the other end side of the main body 21
And the auxiliary hydraulic cylinder device 27 functioning as a turning drive source
With

In the mold opening / closing device 2, the fixed bracket 2
No reinforcing tie bar is provided between 1e and 21f to increase the rigidity, and a tie barless system is adopted. As shown in FIG. 6, the movable die base 23 is connected to the distal end of the main cylinder rod 26i of the main hydraulic cylinder device 26. The mounting plate 2 is provided on the upper part of the movable die base 23.
3s protrudes upward (upward obliquely rearward). The reason why the mounting plate 23s protrudes in this direction is to arrange a sub-hydraulic cylinder device 27, which will be described later, at the rear to secure the amount of advance and retreat of the sub-cylinder rod 23c. The first pivot shaft 23t as the first pivot portion can swing along the height direction, that is, arrows T1 and T2.
The auxiliary hydraulic cylinder device 27 is attached to the mounting plate 2
It is pivoted for 3s.

The auxiliary hydraulic cylinder device 27 includes a first pivot shaft 2
A sub-cylinder main body 27a as a hydraulic cylinder main body pivotally supported along the height direction at 3t and a sub-cylinder rod 23c as a cylinder rod provided in the sub-cylinder main body 27a are provided. The sub-cylinder rod 23c is set so as to be able to retreat in the direction of arrow B1 (direction corresponding to the mold opening direction) and to advance in the direction of arrow B2 (direction corresponding to the mold closing direction). .

As shown in FIG. 6, an intermediate support arm 23u is provided on the upper part of the movable die base 23 in front, that is, the fixed die 1
It is fixed by a fixing tool 23w so as to protrude toward zero. A horizontal shaft 24 is provided on the intermediate support arm 23u.
Has been erected. Swivel plate 2 via swivel axis 24
5 is held by the intermediate support arm 23u. Accordingly, the swivel plate 25 is farther away from the movable die base 23 corresponding to the intermediate support arm 23u. The swivel plate 25 is set to be capable of vertical swivel along arrows S1 (upward swivel) and S2 direction (downward swivel). The movable mold 11 is detachably fixed to the movable mold holding portion 25a of the turning plate 25 by a fixture 11w.

As shown in FIG. 6, a turning assist arm 25x is integrally fixed to the upper portion of the turning plate 25 obliquely upward with respect to a virtual center line Pc of the turning plate 25 in a projecting state. The tip of a sub-cylinder rod 23c of a sub-hydraulic cylinder device 27 is pivotally connected to the swing assist arm 25x by a second pivot 23k.

A plurality of shaft-like first stoppers 23m are provided on the rear side of the movable die base 23, that is, on the fixed bracket 21f side. The first stopper 23m is the main body 2.
The movable die base 23 is capable of abutting against the first fixed bracket 21f, and regulates a retreat amount of the movable die base 23 in accordance with the abutment. A hydraulic or pneumatic lock cylinder device 90 is attached to the movable die base 23 on the side of the swivel plate 25. The lock cylinder device 90 includes a lock cylinder body 9.
0s and a lock cylinder rod 90t provided on the lock cylinder main body 90s so as to be able to advance and retreat along the arrow F1 (lock direction: downward) and F2 direction (lock release direction: upward).
And As shown in FIG. 7, a guide tapered surface 90v whose diameter becomes smaller toward the front is formed as an insertion guide means at the tip of the lock cylinder rod 90t.

As shown in FIG. 6, an extruding mechanism 93 for releasing a cast product, which is a molded product, is attached to a side of the revolving plate 25 that does not contact the movable mold 11. The push-out mechanism 93 includes a plurality of push-out pins 93 c that can protrude from the second cavity mold surface 11 a of the movable mold 11.
With. A plurality of shaft-like second stoppers 25m are held on the side of the revolving plate 25 that does not contact the movable mold 11. The second stopper 25m can contact the movable die base 23, and regulates the posture of the revolving plate 25 with the contact.

As shown in FIG. 6, a lock plate 91 is fixed to a lower portion of the swivel plate 25, and a circular lock hole 91a is formed through the lock plate 91. When the tip of the lock cylinder rod 90t of the lock cylinder device 90 is inserted into the lock hole 91a from the guide tapered surface 90v, the revolving plate 25 is locked to the movable die base 23. Therefore, the lock cylinder device 90 and the lock plate 91 function as lock means for restricting the turning plate 25 to the non-turning position 100k. Swivel plate 2
5 is provided with a rolling roller 91 as a rolling element.
r is attached. The rolling element 23r is also attached to the lower part of the movable die base 23.

When the main hydraulic cylinder device 26 is operated, the movable die base 23 is moved in the horizontal direction (the directions of arrows X1 and X2) together with the swivel plate 25 and the movable mold 11, thereby opening and closing the mold. At this time, the rolling rollers 91r,
Since 23r rolls along the guide surface 20, lateral movement of the movable die base 23 and the like is smoothed. When the auxiliary hydraulic cylinder device 27 is operated to extend the auxiliary cylinder rod 23c and advance in the direction of arrow B2 as shown in FIG. The plate 25x vertically turns around the turning shaft 24 in the direction of arrow R2, and the turning plate 25 turns vertically together with the movable mold 11 in the direction of arrow S2 (downward) to reach the non-turning position 100k. The turning trajectory of the second pivot 23k during the vertical turning is shown as E.

As shown in FIG. 8, the auxiliary hydraulic cylinder device 27
When the auxiliary cylinder rod 23c moves backward in the direction of arrow B1 due to the reverse operation, the turning assist arm 25x makes a vertical turn about 90 degrees about the turning shaft 24 in the direction of arrow R1. As a result, the swivel plate 25 becomes the ascending swivel position 100n via the intermediate swivel position 100m. That is, as shown in FIG. 8, the turning plate 25 is oriented substantially horizontally, and the movable mold 11 is oriented horizontally (substantially horizontal). At this time, the auxiliary hydraulic cylinder device 27 swings around the first pivot 23t,
It is possible to cope with the vertical turning of the turning plate 25.

A description will be given of the usage of the present embodiment. First, as shown in FIG. 6, the sub-hydraulic cylinder device 27 is operated to extend the sub-cylinder rod 23c in the direction of the arrow B2, and the turning plate 25 is turned vertically downward (in the direction of the arrow S2) to the non-turning position 100k. And keep it. That is, similarly to the vertically movable die base 23, the revolving plate 25 is vertically oriented. Furthermore, the lock cylinder device 9
0 is operated to insert and lock the lock cylinder rod 90t into the lock hole 91a of the lock plate 91 to lock the turning plate 25 at the non-turning position 100k. By locking in this manner, it is possible to suppress the displacement of the movable mold 11 even when a load acts during casting or the like.

In this state, the movable die base 23, the revolving plate 25, and the movable mold 11 are moved laterally in the mold clamping direction (the direction of the arrow X2) by the operation of the main hydraulic cylinder device 26 of the mold opening / closing device 2, so that the fixed mold 10 The movable mold 11 is clamped. Thereafter, as shown in FIG.
Is set in the casting mold 1. That is, the entire hot water supply nozzle portion 3 rises in the direction of arrow Y1, and the gate 1 of the casting mold 1
The conical outer wall surface 30b of the contact nozzle 30 of the cylindrical body 32 of the hot water supply nozzle portion 3 is applied to the conical receiving surface 15x of No.5. As a result, the nozzle port 34 and the gate 15 face each other so that they can communicate with each other.
Has been closed by.

That is, when the contact nozzle portion 30 of the hot water supply nozzle 3 is inserted into the gate 15 of the casting mold 1, the movable closing member 33 of the hot water supply nozzle 3 is moved in advance by the operation of the pneumatic cylinder 38 to the arrow Y1. 4, and the conical outer surface 35 a of the closing portion 35 of the movable closing member 33 is brought into contact with the conical inner wall surface 30 a of the nozzle port 34 as shown in FIG.
4 is closed. Thereby, the nozzle port 34 is substantially sealed.

Next, a hot water supply step is performed. At the time of hot water supply, the valve drive circuit 59c opens the on-off valve 59 based on a command signal from the control device 7. Further, based on a command signal from the control device 7, the hydraulic drive circuit 54c
Is moved (elevated) in the direction of arrow Y3 to perform a suction operation,
The pressure inside the supply chamber 51 is reduced. As a result, based on the pressure difference between the supply chamber 51 and the separation tank 41, the molten metal L2 of the low melting point metal in the separation tank 41 of the molten metal holding part 4 is discharged from the discharge port 4r (see FIG. 5).
The air is sucked into the supply chamber 51 of the supply pump 5 through the on-off valve 59, the second communication passage 58, and the distal end opening 51x. At this time, as described above, the nozzle port 34 is closed by the closing portion 35, so that outside air entering the hot water supply chamber 31 of the hot water supply nozzle section 3 through the nozzle port 34 is restricted.

When the target amount of molten metal L2 is sucked into the supply chamber 51 as described above, the valve drive circuit 59c closes the on-off valve 59 based on the command signal from the control device 7, and the separation tank 4
The suction of the molten metal L2 from 1 is stopped. Next, based on the command signal from the control device 7, the pneumatic drive circuit 38c operates the pneumatic cylinder 38 to retreat the movable closing member 33 of the hot water supply nozzle unit 3 in the direction of arrow Y2, thereby closing the nozzle port 34 of the hot water supply nozzle unit 3. Open.

Thereafter, based on a command signal from the control device 7, the plunger 53 of the supply pump 5 is pressed (down) in the direction of arrow Y4. Therefore, the molten metal L2 of the low melting point metal that has been sucked into the supply chamber 51 is pushed out to the hot water supply chamber 31 of the hot water supply nozzle unit 3 through the first communication path 57 and the molten metal supply port 36. At this time, since the on-off valve 59 is closed, the backflow of the molten metal L2 into the separation tank 41 can be suppressed.

The molten metal extruded into the hot water supply room 31 is supplied to the hot water supply room 3.
1 is poured into the cavity 13 of the casting mold 1 through the nozzle port 34 of the hot water supply nozzle section 3 and the gate 15 of the casting mold 1. The molten metal of the low melting point metal poured into the cavity 13 of the casting mold 1 solidifies to obtain a casting. Solidification proceeds from the surface layer portion of the molten metal in contact with the first cavity mold surface 10a and the second cavity mold surface 11a of the casting mold 1 to the inside. As described above, the molten metal in the vicinity of the gate 15 is basically a casting method set to be a final solidified portion.

As shown in FIG. 6, after completion of casting, the main hydraulic cylinder device 26 is operated to move the movable mold 11 in the mold opening direction (the direction of arrow X1) to open the casting mold 1. As shown in FIG. 6, the mold opening is performed until the first stopper 23m contacts the fixing bracket 21f. Further, the lock cylinder device 90 is reversely operated to retreat the lock cylinder rod 90t in the direction of the arrow F2 (lock release direction), whereby the lock plate 91 is released from the lock hole 91a of the lock plate 91. Thereby, the lock of the turning plate 25 is released, and the turning plate 25 can be turned.

In the unlocked state, the sub-hydraulic cylinder device 27 is reversely operated to retreat the sub-cylinder rod 23c in the direction of arrow B1, as shown in FIG. Then, the turning assist arm 25x vertically turns about 90 degrees about the turning shaft 24 in the direction of the arrow R1. Accordingly, the revolving plate 25 also revolves vertically upward by about 90 degrees about the revolving shaft 24 (in the direction of the arrow S1) and jumps up to be substantially horizontal. Therefore, the movable mold 11 fixed to the swivel plate 25 is in a horizontal state.

With the movable die 11 in the horizontal position, the pushing mechanism 93 is operated to push the pushing pin 93c.
And the casting is released from the second cavity mold surface 11 a of the movable mold 11. In this state, the casting is taken out manually or by a robot, and the casting is transported to the unloading site. After removing the casting, the auxiliary hydraulic cylinder device 27
Is operated in reverse to swing the swivel plate 25 downward (in the direction of the arrow S2) to return to the swivel position.
00k (see FIG. 6). At this time, the second stopper 25
Since m is in contact with the movable die base 23, excessive return of the swivel plate 25 is suppressed.

As described above, in this embodiment,
As shown in FIG. 8, the auxiliary hydraulic cylinder device 27 is operated to retract the auxiliary cylinder rod 23 c in the direction of the arrow B <b> 1, thereby vertically rotating the swing assist arm 25 x about the swing shaft 24 by approximately 90 degrees. Then, the movable mold 11 is set to the horizontal state. If the movable mold 11 is turned sideways as described above, the casting can be safely and easily removed from the movable mold 11.

In this embodiment, the cast product can be prevented from dropping onto the floor when the mold is released from the movable mold 11, so that the cast product can be prevented from being deformed or damaged. Therefore, the mold opening and closing device 2 of the present embodiment is suitable for a case where a casting is formed from a material such as a low melting point metal having poor impact resistance. The magnitude of the vertical turning angle of the turning plate 25 is affected by the amount of advance and retreat of the sub cylinder rod 23c of the sub hydraulic cylinder device 27. In the present embodiment, as shown in FIG. 6, a swing assist arm 25x is provided to project forward from the swing plate 25, that is, toward the fixed mold 10 side, thereby forming a vertical "curved" form. . Further, the mounting plate 23s is directed rearward with respect to the swivel plate 25,
It protrudes in a direction away from zero. Therefore, in order to increase the turning angle of the turning plate 25, the auxiliary hydraulic cylinder device 27 is attached to the mounting plate 23 with a large amount of forward and backward movement of the auxiliary cylinder rod 23c of the auxiliary hydraulic cylinder device 27 secured.
s.

Further, since the turning assist arm 25x functioning as a point of action for receiving the turning drive force is provided forwardly with respect to the turning plate 25, that is, toward the fixed die 10, the auxiliary hydraulic cylinder which is the turning drive source is provided. The device 27 can be installed as close as possible to the swivel plate 25. That is, the auxiliary hydraulic cylinder device 27 can be installed on the movable die base 23 approaching the rear side of the swivel plate 25.

In this embodiment, as described above, the lock cylinder device 90 is operated to lock the revolving plate 25 at the non-revolving position 100k. If you lock it like this,
Even if a load is applied during casting or the like, the displacement of the movable mold 11 can be suppressed. In addition, when the mold is opened and closed, the movable mold 11 can be prevented from being unnecessarily shaken due to the lateral movement.

When the molten metal of the low melting point metal poured into the cavity 13 of the casting mold 1 solidifies, the solidification shrinkage may be large depending on the metal composition. In this case, the molten metal in the cavity 13 runs short. In this respect, in this embodiment, even after the molten metal is poured into the cavity 13, the control device 7 keeps the nozzle port 34 of the hot water supply nozzle 3 open. Then, the control device 7 continues the pressurizing operation of the plunger 53 of the supply pump 5 so that the molten metal of the low melting point metal is supplied to the nozzle opening 34
And then refill the cavity 13 of the casting mold 1. Therefore, solidification shrinkage in the cavity 13 of the casting mold 1 can be compensated.

In the molten metal poured into the cavity 13 of the casting mold 1, solidification proceeds from the molten metal portion in contact with the first cavity mold surface 10a and the second cavity mold surface 11a. Then, the central part of the molten metal poured into the cavity 13 is still in a molten state. Therefore, if the pressurizing operation by the plunger 53 is continued as described above, the molten metal can be effectively refilled into the cavity 13 of the casting mold 1 by the pressurizing operation. Therefore, the solidified portion accompanying the solidification shrinkage in the cavity 3 and the cavity 1
The small gap between the third cavity mold surfaces 10a and 11a can be suppressed, and a decrease in dimensional accuracy in a cast product can be suppressed. Furthermore, casting defects such as external shrinkage and shrinkage cavities in a cast product can be suppressed. In addition, the pressure applied by the plunger 53 when replenishing the molten metal is reduced by the cavity 1.
3 also acts on the molten metal and solidified portion, and can also contribute to promoting the densification of the metal structure of the casting.

Incidentally, depending on the composition of the low melting point metal, the low melting point metal in the cavity 13 of the casting mold 1 may expand during solidification. If the expansion amount is large when expanding in this way, the expansion pressure of the cavity 13 tends to act as an excessive load on the mold opening and closing device 2 as described above. In addition, a gap is generated between the split surface of the movable die 11 and the split surface of the fixed die 10 due to the excessive expansion pressure, so that the cast product tends to be thickened and the flash of the cast product tends to be thick. For this reason, conventionally, a tie bar reinforcing method has been adopted in which a large-diameter tie bar is connected between the fixing brackets 21e and 21f of the mold opening and closing device 2 to increase the rigidity of the mold opening and closing device 2.

In this regard, in this embodiment, even if the expansion occurs as described above, the cavity 1
When the molten metal has been poured into the hot water supply nozzle 3, the control device 7 once closes the nozzle port 34 of the hot water supply nozzle unit 3, turns off the supply pump 5, and releases the pressurizing operation by the plunger 53. When the solidification of the molten metal in the cavity 13 progresses, the nozzle port 34
The expansion pressure acts on the movable closing member 33 in the opening direction. Therefore, excess molten metal in the cavity 13 of the casting mold 1 is returned from the nozzle port 34 to the hot water supply chamber 3 of the hot water supply nozzle unit 3. Therefore, the excessive inflation pressure is reduced or eliminated, and the excessive load acting on the mold opening / closing device 2 can be suppressed. Therefore, even if the tie barless method is adopted as in this embodiment,
It is possible to improve the durability and extend the life of the mold opening and closing device 2.

The force applied by the pneumatic cylinder 38 to the movable closing member 33 in the direction in which the nozzle port 34 is closed is FA, and the movable closing member 33 is opened when the low melting point metal in the cavity 13 expands. Movable closing member 3
The force acting on 3 is FB. In this embodiment, the FA
Is set smaller than FB. Therefore, when the expansion pressure of the low melting point metal in the cavity 13 is generated, the movable closing member 33 is automatically opened by the expansion pressure, and the excess molten metal can be returned from the nozzle port 34 to the hot water supply nozzle portion 3. Therefore, an excessive inflation pressure in the cavity 13 can be removed, and a simple tie-bar-less system as in this embodiment can be employed.

In this embodiment, the driving source for closing the movable closing member 33 so as to close the nozzle port 34 is as follows.
A pneumatic cylinder 38 that operates pneumatically. Unlike oil, which is an incompressible fluid, air has compressibility, and the movable closing member 33 can be automatically opened by the expansion pressure of the low melting point metal in the cavity 13. As described above, when the molten metal is replenished into the cavity 13, if the molten metal solidifies in the vicinity of the hot water supply chamber 31 or the nozzle port 34 of the hot water supply nozzle unit 3, a clogging phenomenon occurs, and the fluidity of the molten metal is hindered. The ability to replenish molten metal to the furnace decreases. The same applies when returning excess molten metal in the cavity 13 to the hot water supply nozzle section 3.
When the molten metal solidifies near 4 and a clogging phenomenon occurs, the expansion pressure absorbing capacity is reduced.

In this respect, in this embodiment, the hot water supply nozzle 3
Since the heat medium passage 6 through which the high-temperature heat medium flows is formed inside the movable closing member 33, the heat retaining property of the hot water supply nozzle portion 3 is maintained. Therefore, hot water supply room 31 of hot water supply nozzle section 3
Also, it is possible to suppress the occurrence of a clogging phenomenon due to solidification of the molten metal near the nozzle port 34. Therefore, the ability to replenish the molten metal and the ability to absorb the expansion pressure through the nozzle port 34 can be secured.

In the present embodiment, as described above, the heat medium passage 6 is provided at the point 35 of the closing portion 35 of the movable closing member 33.
In this method, the vicinity of the closing portion 35 of the movable closing member 33 is efficiently heated by colliding the heat medium with u. Therefore, the closing portion 3 of the movable closing member 33 facing the nozzle port 34
5 can be maintained at a high temperature. Therefore, the nozzle port 34
The solidification of the molten metal in the vicinity can be suppressed, and the nozzle port 3
4, the ability to replenish the molten metal and the ability to absorb the expansion pressure can be ensured.

In this embodiment, as described above, a part of the heat medium passage 6 is formed as a spiral passage spirally wound around the central axis of the movable closing member 33, so that the heat medium is not supplied. A transit time for passing through the spiral passage can be secured. Therefore, the heat exchange time of the high-temperature heat medium is secured, and the movable closing member 33 can be effectively heated by the high-temperature heat medium.

[0059]

According to the apparatus of the present invention, the movable drive in the vertical state is turned to the horizontal state by operating the turning drive source to vertically turn the turning plate. If the movable mold is set in the horizontal direction, a molded product such as a cast product can be safely and easily taken out from the movable mold.

In such an apparatus of the present invention, it is possible to prevent a molded product such as a cast product from dropping onto the floor surface when releasing from the movable mold, and to prevent deformation and damage of the molded product. Therefore, the apparatus according to the present invention is suitable for molding a molded article from a material such as a low melting point metal having a low impact resistance.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a supply pump and a hot water supply nozzle unit.

FIG. 2 is a sectional view of a hot water supply nozzle.

FIG. 3 is a cross-sectional view of a hot water supply nozzle showing a state in which a movable closing member has opened a nozzle opening.

FIG. 4 is a sectional view of a hot water supply nozzle showing a state in which a movable closing member closes a nozzle opening.

FIG. 5 is a configuration diagram showing a state where a separation tank, a supply pump, and a mold opening / closing device are arranged.

FIG. 6 is a side view showing a state in which the turning plate is at a non-turning position.

FIG. 7 is a configuration diagram showing a state in which a lock cylinder rod of the lock cylinder device is inserted into a lock hole.

FIG. 8 is a side view showing a state in which the swivel plate is in the ascending swivel position and the movable mold is in the horizontal position.

[Explanation of symbols]

In the figure, 1 is a casting mold (molding mold), 10 is a fixed mold, 11 is a movable mold, 11a is a second cavity mold surface, 13 is a cavity, 15 is a gate, 2 is a mold opening / closing device, 21 is a main body, and 22 is Fixed die base (fixed plate), 23 is a movable die base (movable plate), 23c is a sub-cylinder rod (cylinder rod), 23t is a first pivot (first pivot), and 23k is a second pivot (second). (A pivot portion), 24 is a turning shaft, 25 is a turning plate, 25a is a movable holding portion, 25m is a second stopper, 25x is a turning auxiliary arm, 26 is a main hydraulic cylinder device (main drive source), and 27 is a sub hydraulic cylinder. Device (slewing drive source), 27a is a sub-cylinder main body (fluid pressure cylinder main body), 3 is a hot water supply nozzle portion, 6 is a heat medium passage, 90 is a lock cylinder device (lock means), 91 is a lock plate (lock means), 93 is an extrusion mechanism 93c shows the extrusion pin.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Hatsuyama 1st Tenno, Takaoka Shinmachi, Toyota City, Aichi Prefecture Inside Aisin Takaoka Co., Ltd. (72) Inventor Ryuzo Oide 3-11-12 Ohori, Matsubara City, Osaka Prefecture F-term in Kenken Co., Ltd. (reference) 4F202 AA49 AJ02 AM32 CA11 CB01 CK81 CL04 CL12 CL22 CL42 CL46 CL50 CM02 CM12 CM28

Claims (5)

[Claims] 1. A mold opening / closing device for holding a fixed mold and a movable mold having a cavity for molding a molded product and for horizontally moving the movable mold in a mold opening / closing direction, comprising: a main body; and the fixed mold provided in the main body. , A movable plate provided on the main body and capable of laterally moving in the mold opening and closing direction, a main drive source for horizontally moving the movable plate in the mold opening and closing direction, and provided on the movable plate so as to be capable of vertical turning. A revolving plate having a movable type holding part for holding the movable type, and a vertically revolving type of the movable type held in the revolving plate by turning the revolving plate vertically to a horizontal state. A mold opening and closing device, comprising: a turning drive source. 2. A mold opening / closing device according to claim 1, further comprising a lock means for locking said turning plate to said movable plate in a non-turning state. 3. An extruding mechanism according to claim 1 or 2, wherein said swiveling plate is provided with an extruding mechanism having an extruding pin for releasing a molded product which can protrude from a surface of a molding cavity of said movable die. A mold opening and closing device. 4. The turning plate according to claim 1, wherein the turning plate is provided with a stopper capable of contacting with the movable platen and restricting the posture of the turning plate with the contact. A mold opening / closing device, characterized in that: 5. The swivel plate according to claim 1, further comprising: a swivel assist arm attached to the swivel plate so as to protrude from the swivel plate. A fluid cylinder body pivotally supported by the first pivot portion on the movable plate so as to be able to swing along, and a front end portion provided on the fluid pressure cylinder body so as to be able to move forward and backward by a second pivot portion on the turning assist arm. A mold opening / closing device comprising: a swingable pivotally supported cylinder rod.