JPH0550206A - Vertical die casting machine - Google Patents

Abstract

PURPOSE:To easily and quickly execute changing work of die and to obtain a vertical die casting machine enabling manufacture of a product having little burr. CONSTITUTION:By preventing inclination of an upper platen 16 by a connecting rod 70, movable tie bars 28 are made to two pieces and the changing work of the die is facilitated. A pressing device composed of mainly a pressing cylinder 76 always presses the upper platen 16 to the stopper 84 by the fixed pressing force to prevent the inclination of upper platen 16. At the time of die-clamping, reaction force to the die clamping force by a die clamping cylinder 56 separates the upper platen 16 from the stopper 84 against the pressing force of pressing device. As the pressing force is low and the reaction force to the die clamping force is almost uniformly loaded to each tie bar 26, 28, the die clamping force is uniformly loaded to the die to obtain the good product having little burr.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical die casting machine, and more particularly to a vertical die casting machine in which a die can be easily replaced.

[0002]

2. Description of the Related Art Conventionally, when replacing a die in a vertical die casting machine, as described in Japanese Patent Application No. 3-69073, the tie bar interval is increased,
I was pulling out the tie bar.

[0003]

However, if the tie bar spacing is increased, the size of the entire apparatus becomes large and the equipment cost increases. Further, in a vertical die casting machine including a movable tie bar that can be pulled out and a fixed tie bar whose both ends are fixed, the movable tie bar cannot support the upper platen, so the fixed tie bar must support it. Therefore, the upper platen cannot be supported unless three of the four tie bars are fixed tie bars.

Therefore, for example, when the die has a plurality of slide cores and the cylinders for moving the slide cores are attached so as to extend to both sides in the moving direction of the die, they are attached. One of the cylinders on the fixed tie bar side interferes with the fixed tie bar.
The mold cannot be replaced only by pulling out the movable tie bar of the book. In that case, it is necessary to remove the cylinder that interferes with the fixed tie bar from the mold, mount the mold on the plate and then mount it on the mold, which causes problems such as an increase in the number of work steps and labor.

If the number of tie bars is increased or a connecting rod for connecting the upper platen and the machine base is provided, it is possible to prevent the upper platen from tilting and to have two movable tie bars. Occurs. When the number of tie bars is set to 5 or 6, generally, the tie bars are not arranged at the vertices of a regular pentagon or a regular hexagon centered on the mold clamping device, and each quadrangle centered on the mold clamping device. A tie bar is arranged at the apex, and the remaining one or two tie bars are arranged outside the quadrangle. Therefore, the reaction force of the mold clamping force is not evenly applied to each tie bar at the time of mold clamping, and the mold clamping force is not evenly applied to the mold, which causes burr. Even when the connecting rod is provided between the upper platen and the machine base, the reaction force of the mold clamping force is not evenly applied to each tie bar at the time of mold clamping, and the upper platen tilts and causes burrs.

In view of the above circumstances, the present invention has an object to obtain a vertical die casting machine capable of easily performing a die replacement operation and capable of producing a good molded product with less burr. It is a thing.

[0007]

In order to solve the above problems, a vertical die casting machine according to the present invention comprises an upper platen, a machine base provided at a position facing the upper platen, and the upper platen and the machine base. Both ends are fixed to and to connect the upper platen and the machine base 2
The fixed tie bar of the book, and the upper platen and the machine base are always connected, but two movable tie bars that can be retracted to the retracted position as needed, or one of the upper platen and the machine base. Holds a fixed plate portion that is provided as a part of one of them and that holds the fixed die, and a movable die that cooperates with the fixed die to form a cavity that can be opened and closed,
A movable plate that is guided by a fixed tie bar and a movable tie bar so as to be able to approach and separate from the fixed plate portion, and a mold clamping that tightens the fixed die and the movable die by applying a force to the movable plate so as to approach the fixed plate portion. A vertical die gust machine including a device, which is provided on the opposite side of the two movable tie bars with respect to the two fixed tie bars, and has a first end fixed to one of an upper platen and a machine base, At least one coupling rod having a second end penetrating the other of the upper platen and the machine base and having a stopper at the second end thereof for defining an approach limit between the upper platen and the machine base, and at least a movable rod. When the tie bar is returned from the retracted position to the state where the upper platen and the machine base are joined, the other side of the upper platen and the machine base Pressed against the stopper, the other of the time of mold clamping is configured to include a tolerance for pushing device that separates from the stopper.

The pressing device may be one that allows the other to be separated from the stopper while applying a pressing force to the stopper, or one that does not apply the pressing force during mold clamping and allows the separation. In the former case, a part of the reaction force of the mold clamping force will be applied to the connecting rod, but its magnitude should be sufficiently smaller than the reaction force applied to the tie bar so that there is no substantial effect. be able to.

[0009]

When at least the movable tie bar is returned to the coupled state, the pressing device presses the other of the upper platen and the machine base against the stopper to prevent the upper platen from tilting. In this state, the movable tie bar connects the upper platen and the machine base, so that the upper platen and the machine base are connected in parallel with each other by the four tie bars. Moreover, when the mold is clamped, the pressing device allows the other of the upper platen and the machine base to be separated from the stopper. Therefore, the reaction force of the mold clamping force is not substantially applied to the connecting rod, and the reaction force is evenly applied to the fixed tie bar and the movable tie bar.

[0010]

According to the vertical die casting machine of the present invention, the upper platen does not tilt even if the number of movable tie bars is two. The space formed by pulling out the two movable tie bars can be passed through as it is, for example, even with a mold in which a cylinder for moving the slide core is projected and attached on both sides, so that the mold replacement work can be performed easily and quickly. Therefore, the operation rate of the device can be improved. Moreover, since the upper platen is prevented from tilting, wear of the guide bush of the movable plate is prevented.

Further, during mold clamping, the reaction force of the mold clamping force is evenly applied to the fixed tie bar and the movable tie bar, so that the upper platen does not tilt and an excessive reaction force is not applied to a specific tie bar. By maintaining the parallelism between the fixed mold and the movable mold, it is possible to manufacture a good molded product with less burr.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 10 is a vertical die casting machine, and 12 is a die exchange frame. The mold exchanging frame 12 is provided adjacent to the vertical die casting machine 10.
The vertical die casting machine 10 includes a machine base 14 and an upper platen 16, and a fixed plate 18 is fixed to the machine base 14 to form a fixed plate portion. On the fixed plate 18, two rails 20 are provided. Is provided. Similarly, two rails 22 are provided on the mold exchanging base 12, and the upper surface of the mold exchanging base 12 and the upper surface of the fixed plate 18 are at the same height. Guided by the rails 20 and 22, it can move between the vertical die casting machine 10 and the mold exchanging base 12.

Between the fixed plate 18 and the upper platen 16, two fixed tie bars 26 whose both ends are fixed to the fixed plate 18 and the upper platen 16, respectively, and the fixed plate 18 and the upper platen 16 are always provided. , But two movable tie bars 28 that can be retracted to the retracted position are provided if necessary. Movable tie bar 28
Is arranged on the side of the mold exchanging base 12.

A through hole is formed in the fixed plate 18 to allow the first end portion 34 of the movable tie bar 28 to pass therethrough, and a tie bar fixing device 36 is provided below the through hole. The tie bar fixing device 36 includes a split nut 40 that is opened and closed by a cylinder 38. The split nut 40 is always closed by the cylinder 38 and fixes the first end portion 34 to the fixed plate 18. When the movable tie bar 28 is retracted to the retracted position, the split nut 40 is opened by the cylinder 38, and the disengagement of the first end portion 34 from the fixed plate 18 is permitted. Split nut 4
The closed state and open state of 0 are detected by a sensor (not shown).

Further, the second end portion 41 penetrates the upper platen 16, and the supporting plate 42 is provided at the protruding end portion of the upper platen 16.
It is attached in parallel with and extending outward. A pull-out cylinder 44 is fixed to the side wall surface of the upper platen 16, and one end of a piston rod 46 extending upward from the pull-out cylinder 44 is connected to the support plate 42. The support plate 42, the piston rod 46, and the movable tie bar 28 can move integrally.

The pull-out cylinder 44 is connected to a hydraulic device (not shown), and the action of the pull-out cylinder 44 pushes up the movable tie bar 28 to retract it to the retracted position.

The movable plate 50 is movably inserted through the fixed tie bar 26 and the movable tie bar 28. Guide cylinders 52 and 54 are attached to the movable plate 50, and these are slidably fitted to the tie bars 26 and 28. A mold clamping cylinder 56 is attached to the upper platen 16, and the mold clamping cylinder 5 is attached.
The piston rod 58 of No. 6 is connected to the movable plate 50. By the operation of the mold clamping cylinder 56, the movable plate 50 is guided by the fixed tie bar 26 and the movable tie bar 28 and descends to approach the fixed plate 18, and the mold 60 is clamped between the plates 18 and 50.

The mold 60 comprises an upper mold 61 and a lower mold 62, and these are connected by a connecting hook (not shown). The upper die 61 includes a plurality of slide cores (not shown) that are movable in mutually different directions,
Cylinders 64 for moving each slide core are attached to the side wall surface of the upper die 61 so as to extend outward. The stationary plate 18 and the movable plate 50 are each provided with a clamp device (not shown), and the movable plate 50 is provided with the upper die 61 and the fixed plate 1.
The lower molds 62 are clamped to each of the eight.

A connecting rod 70 is provided between the machine base 14 and the upper platen 16 on the side opposite to the movable tie bar 28 with respect to the fixed tie bar 26, and its first end 71 is fixed to the machine base 14. , The second end 72
Penetrates the upper platen 16 and has a support plate 74 at its protruding end.
Are mounted parallel to the upper platen 16. The support plate 74 is fixed to the connecting rod 70 at an intermediate portion, and the piston rods 78 of the pressing cylinders 76 fixed to the upper platen 16 are connected to the lower surfaces of both ends, respectively. Source 80 is liquid passage 8
2 are connected. Further, a stopper 84 is provided at the second end portion 72, and the upper platen 16 is made parallel to the machine base 14 when the upper platen 16 is in contact with the stopper 84. In this embodiment, the upper platen 16 is the "other side" described in the claims.

The hydraulic pressure of the hydraulic pressure source 80 is reduced by the pressure reducing valve 88 and the reverse valve 9.
It is supplied to the pressing cylinder 76 via 0. The hydraulic pressure source 80 includes an electric motor, a pump, a tank, etc., which are not shown, and is a hydraulic pressure source common to each hydraulic device of the vertical die casting machine 10. Since the vertical die casting machine 10 is provided with a hydraulic device such as the mold clamping cylinder 56 that requires a large actuation force, the hydraulic pressure source 80 generates a high hydraulic pressure. The pressure reducing valve 88 adjusts the hydraulic pressure generated by the hydraulic pressure source 80 to a height suitable for the pressing cylinder 76. The adjusted hydraulic pressure is evenly transmitted to both pressing cylinders 76.

An accumulator 92 and a relief valve 94 are connected between the check valve 90 and the pressing cylinder 76. Therefore, even if some leakage occurs in the hydraulic circuit with the hydraulic pressure source 80 stopped, the pressing cylinder 76 can continue to operate by replenishing the liquid from the accumulator 92. The support plate 74, the pressing cylinder 76, the hydraulic pressure source 80, the liquid passage 82, the pressure reducing valve 88, the check valve 90, the accumulator 92,
The relief valve 94 and the like constitute a pressing device.

The operating force of the pressing cylinder 76 constantly pushes up the support plate 74 and pushes down the upper platen 16 to press the upper platen 16 against the stopper 84 with a constant pressing force, and the inclination of the upper platen 16 is prevented.

At the time of mold clamping, the reaction force of the mold clamping force by the mold clamping cylinder 56 is evenly applied to the tie bars 26 and 28, and the upper platen 16 rises as the tie bars 26 and 28 extend. As a result, the upper platen 16 is separated from the stopper 84, the hydraulic pressure of the pressing cylinder 76 increases, the hydraulic fluid is pushed out by that amount, the relief valve 94 is opened, and the hydraulic fluid is returned to the tank. As described above, the upper limit of the hydraulic pressure of the pressing cylinder 76 is regulated by the relief valve 94.
Of the upper platen 16 against the moment when the upper platen 16 rotates about the fixed tie bar 26 as a fulcrum based on its own weight and the weight of the members supported by the upper platen such as the drawing cylinder 44 and the mold clamping cylinder 56. The size is set to be relatively small within a range that can be pressed against 84. Therefore, when the mold is clamped, the connecting rod 70 is substantially equal, the fixed tie bar 26 and the movable tie bar 28 are evenly extended, and the upper platen 16 is moved upward while being horizontal. Therefore, the upper platen 16 is not tilted. Absent.

In the vertical die casting machine 10 constructed as described above, when a die is attached, the split nut 40 that fastens the first end 34 of the movable tie bar 28 is opened by the cylinder 38, and the split nut 40 is opened. The movable tie bar 28 can be pulled out. When the movable tie bar 28 is moved to the retracted position by the action of the pulling-out cylinder 44 and a space of a sufficient size is formed between the movable plate 50 and the fixed plate 18, the mold carrier truck 2 passes through the space.
The mold 60 is carried in by 4. Cylinders 64 are attached to the upper die 61 of the die 60 so as to extend outward from the four side wall surfaces, respectively. Therefore, it is not necessary to attach the removed cylinder 64 after attaching the die 60 to each plate 18, 50, and the die 60 can be attached easily and quickly.

After the mold carrier 24 reaches a predetermined position, the movable tie bar 28 is lowered by the pull-out cylinder 44, and the split nut 40 is closed by the cylinder 38 at the lower end position so that the first end 34 is fixed. It is fixed to the plate 18. The movable plate 50 is lowered by the mold clamping cylinder 56, and the upper mold 61 is held by a clamp device (not shown). The upper die 61 and the lower die 62 are connected to each other by a connecting hook. After the mold carrier 24 is moved to the mold exchanging base 12,
When the movable plate 50 is further lowered and the lower die 62 contacts the fixed plate 18, the fixed plate 18 holds the lower die 62 by a clamp device (not shown). The mold exchanging carriage 24 can pass between the tie bars even when the movable tie bar 28 is at a position where the upper platen 16 and the fixed plate 18 are coupled to each other.

The connecting hook of the mold 60 is removed, and the upper mold 61 is removed.
Can be separated from the lower mold 62, and the work of attaching the mold is completed. Thereafter, the mold 60 is opened to clean the inside of the cavity, and the mold is closed by the mold clamping cylinder 56. When the mold is clamped, a molten metal material is injected into the cavity by an injection device (not shown), and a molded product is obtained. Manufactured. At this time, since the reaction force of the mold clamping force is evenly applied to the fixed tie bar 26 and the movable tie bar 28, the mold clamping force is evenly applied to the mold, and a good molded product with less burrs can be obtained. Further, uneven wear of the guide cylinders 52, 54 is avoided, and the durability of the vertical die casting machine 10 is improved.

Another embodiment of the present invention is shown in FIG. This embodiment is a modification of the pressing device of the above embodiment. In the above embodiment, the piston rod 78 of the pressing cylinder 76 is connected to the support plate 74 attached to the second end 72 of the connecting rod 70, whereas in the present embodiment, the second connecting rod 110 is connected. A piston portion 112 having a diameter larger than that of the connecting rod 110 is provided at the end portion, and the piston portion 112 cooperates with the housing 113 to press the cylinder 11.
Make up 4.

The internal space of the pressing cylinder 114 is divided into two chambers by the piston part 112, and the piston part 11 is divided into two chambers.
A liquid pressure source 80 is connected to the chamber 116 on the side of the upper platen 16 above 2 via a liquid passage 82, and a tank 120 is connected to the chamber 118 on the opposite side. The operation of the pressing cylinder 114 is the same as that of the pressing cylinder 76.

As is clear from the above description, in this embodiment, the hydraulic device 80, the liquid passage 82, the pressure reducing valve 88,
The pressing cylinder 114 and the like form a pressing device.

Yet another embodiment of the present invention is shown in FIG.
In the embodiment shown in FIGS. 1 and 2, the operating force of the pressing cylinder directly presses the upper platen 16 against the stopper 84, whereas in the present embodiment, the wedge drive cylinder 150 advances the wedge 152 to advance the connecting rod. By engaging a flange 156 provided on 154, the upper platen 16 is pressed against the stopper 84, and the wedge 152 is moved backward, so that the upper platen 16 stops the stopper 8.
4 is allowed.

The wedge 152 has a U-shaped tip, and the U-shaped portion straddles the connecting rod 154 and engages with the inclined surface formed on the flange 156 at its own inclination. ..

A hydraulic pressure source 80 is connected to the wedge drive cylinder 150 via a two-position solenoid valve 166. Further, the hydraulic pressure source 80 passes through the three-position solenoid valve 170 and then the mold clamping cylinder 5
It is also connected to 6. The two-position solenoid valve 166 is in the illustrated first position when the movable tie bar 28 is moved to the retracted position, and is switched to the second position by exciting the solenoid during mold clamping.

In the first position of the two-position solenoid valve 166, the hydraulic pressure source 80 is connected to the piston head side chamber of the wedge drive cylinder 150 via the pressure reducing valve 88, and the piston rod side chamber is connected to the tank 180 via the reverse valve 178. Can be communicated. The hydraulic pressure of the hydraulic pressure source 80 adjusted by the pressure reducing valve 88 is transmitted to the piston head side chamber of the wedge drive cylinder 150, and the operating force based on the hydraulic pressure causes the piston rod 160 to project and the wedge 152 to move forward. At its advanced end position, the wedge 152 presses the upper platen 16 against the stopper 84, which prevents the upper platen 16 from tilting.

When the two-position solenoid valve 166 is switched to the second position, the hydraulic pressure source 80 is connected to the piston rod side chamber of the wedge drive cylinder 150 via the sequence valve 182, and the piston head side chamber is connected to the tank 180. .. The sequence valve 182 is pilot-controlled by the hydraulic pressure of the mold clamping cylinder 56, and is opened when the hydraulic pressure of the mold clamping cylinder 56 becomes slightly higher. When the sequence valve 182 is opened, the hydraulic pressure of the hydraulic pressure source 80 is directly transmitted to the piston rod side chamber and the wedge 152
Is retracted, allowing the upper platen 16 to move away from the stopper 84. When the hydraulic pressure of the mold clamping cylinder 56 becomes slightly higher, the machine base 14 supports the upper platen 16 via the mold 60 and the mold clamping cylinder 56, so that the upper platen 16 does not move even if the wedge 152 retracts. There is no inclination.

On the other hand, the three-position solenoid valve 170, which is normally in the first position shown in the figure, is switched to the second position when the mold is closed and to the third position when the mold is opened by exciting the solenoid. In the first position, the hydraulic pressure source 80 and the mold clamping cylinder 56 are shut off. When switched to the second position, the hydraulic pressure source 80 is communicated with the piston head side chamber of the mold clamping cylinder 56 via the throttle valve 184, and the piston rod side chamber is passed through the throttle valve 186 to the tank 180.
Be communicated to. The mold clamping cylinder 56 has a hydraulic pressure source 8
The hydraulic pressure of 0 is transmitted without being reduced, and the movable plate 50 is lowered by the operating force based on the hydraulic pressure to clamp the die 60. When switched to the third position, the hydraulic pressure source 80 is connected to the piston rod side chamber of the mold clamping cylinder 56 via the throttle valve 186, and the piston head side chamber is connected to the throttle valve 184.
And is communicated with the tank 180, and the mold clamping force is removed.

Since the working fluid from the mold clamping cylinder 56 is returned to the tank 180 through the throttle valves 184 and 186, the piston rod 58 and the movable plate 50 can be moved up and down at an appropriate speed.

The 3-position solenoid valve 170 can be switched at the same time as the 2-position solenoid valve 166 or with a slight delay depending on the mold closing signal and the mold opening signal. When the reaction force of the mold clamping force at the time of mold clamping moves the upper platen 16 upward, the wedge 152 must be retracted, so that the two-position solenoid valve 166 is switched to the second position, or After a short delay, the three-position solenoid valve 170 is switched to the second position by the mold closing signal. The hydraulic pressure of the mold clamping cylinder 56 becomes a little higher,
When the mold 60 is in a state of substantially supporting the upper platen 16, the sequence valve 182 opens the wedge 152 and allows the upper platen 16 to be separated from the stopper 84. Therefore, the tie bars 26 and 28 are evenly stretched by the reaction force of the mold clamping force, and the inclination of the upper platen 16 is prevented.

When the mold is opened, the connecting rod 154 must be fixed to the upper platen 16 at the time when the mold clamping force is removed. Therefore, the two-position solenoid valve 166 is switched to the first position or at the same time or with a slight delay. The three-position solenoid valve 170 is switched to the third position by the mold opening signal. In the wedge 152, the upper platen 16 is the stopper 84.
Since it is separated from the forward end, it cannot reach the forward end, but at that time it is advanced to a position possible and the wedge 15 is driven with a constant hydraulic pressure.
Press 2 down. The mold clamping force is removed so that the upper platen 16 contacts the stopper 84 and at the same time the wedge 152
Reach the forward end and connect the connecting rod 154 to the upper platen 16
Fixed to.

As is clear from the above description, in this embodiment, the cylinder 150, the wedge 152, and the hydraulic pressure source 8 are provided.
The 0, 2 position solenoid valve 166, the sequence valve 182 and the like constitute a pressing device.

Yet another embodiment of the present invention is shown in FIG.
In each of the above embodiments, the pressing device is composed of a hydraulic device, whereas in this embodiment, it is composed of a weight 210. The first end 212 of the connecting rod 211 is fixed to the upper platen 16, and the second end 214 is fixed to the fixing plate 18.
And the weight 210 is attached to the second end 214 thereof. The weight of this weight 210 is
The size is relatively small in a range sufficient to bring the stopper 216 of the second end portion 214 into contact with the upper surface of the fixed plate 18 when the mold is not clamped. In this embodiment, the fixed plate 18
The machine base 14 having parts is the "other side" of the claims.

The weight 210 constantly urges the fixed plate 18 toward the spacer 216, but during mold clamping, the reaction force of the mold clamping force causes the fixed plate 18 to move to the spacer 21.
Allowed to be separated from 6. Since the weight of the weight 210 is much smaller than the mold clamping force, the reaction force of the mold clamping force extends the tie bars 26, 28 evenly, and the upper platen 1
Move 6 upward while keeping it horizontal.

In this embodiment, since it is not necessary to provide a hydraulic device as a pressing device, the device can be manufactured at low cost.

Although only one connecting rod is provided in each of the above embodiments, two or more connecting rods may be provided. Other,
Based on the knowledge of those skilled in the art, various improvements, such as changing the configuration of the pressing device, without departing from the scope of the claims,
The present invention can be implemented in a modified form.

[Brief description of drawings]

FIG. 1 is a front view (partial cross section) showing a vertical die casting machine according to an embodiment of the present invention.

FIG. 2 is a view showing a pressing device of a vertical die casting machine which is another embodiment of the present invention.

FIG. 3 is a view showing a pressing device of a vertical die casting machine which is still another embodiment of the present invention.

FIG. 4 is a front view showing a part of a vertical die casting machine which is still another embodiment of the present invention.

[Explanation of symbols]

 10 Vertical Die Casting Machine 14 Machine Base 16 Upper Platen 18 Fixed Plate 26 Fixed Tie Bar 28 Movable Tie Bar 50 Movable Plate 56 Clamping Cylinder 70 Connecting Rod 76 Push Cylinder 80 Hydraulic Pressure Source 84 Stopper 110 Coupling Rod 114 Push Cylinder 150 Wedge Drive Cylinder 152 Wedge 154 Connecting rod 210 Weight 211 Connecting rod 216 Stopper

Claims (1)

[Claims] 1. An upper platen, a machine base provided at a position facing the upper platen, and two fixed tie bars having both ends fixed to the upper platen and the machine base to connect the upper platen and the machine base. And, always, the upper platen and the machine base are combined,
Two movable tie bars that can be retracted to a retracted position as needed, a fixed plate portion that is provided as a part of one of the upper platen and the machine base and holds the fixed mold, and the fixed mold. A movable plate that forms an openable and closable cavity in cooperation with the movable plate, and the movable plate is guided by the fixed tie bar and the movable tie bar so that the movable plate can be moved toward and away from the fixed plate portion, and the movable plate is brought close to the fixed plate portion. A vertical die casting machine including a mold clamping device that clamps a fixed mold and a movable mold by applying a force in a direction, and is provided on the side opposite to the two movable tie bars with respect to the two fixed tie bars, The first end is fixed to one of the upper platen and the machine base, the second end penetrates the other of the upper platen and the machine base,
At least one connecting rod having a stopper that defines the approach limit between the upper platen and the machine base at the second end thereof, and at least a movable tie bar connecting the upper platen and the machine base from the retracted position. The vertical die casting includes a pressing device that presses the other one of the upper platen and the machine base against the stopper when returning to the above, and allows the other to separate from the stopper during mold clamping. Machine.