JPH05192755A - Die clamping device of forming machine - Google Patents

Abstract

PURPOSE:To prevent the break of die clamping cylinder caused on the deformation of deflection of the moving die plate at the die clamping time and the generation of one side wearing of the fitting slide part at an early time. CONSTITUTION:A spherical washer 50 is arranged between a cylinder housing 24 of a die clamping cylinder 18 and a moving die plate 20, the attitude of the cylinder housing 24 is almost vertically kept with the sliding on spherical surface of the spherical washer 50 even if the moving die plate 20 is deformed with deflection at the die clamping time, the excess force between a guide post 16 and a piston member 30 is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device of a molding machine, and more particularly, to an improvement of a mold clamping device in which a piston member is provided on a guide post for guiding a movable die plate to integrally form a mold clamping cylinder. It is about.

[0002]

[Prior Art]

(A) A fixed die plate to which a fixed mold is attached, (b) a plurality of guide posts that are erected on the fixed die plate around the fixed mold, and (c) integrally with the guide post. A plurality of mold clamping cylinders each comprising a piston member provided, a guide post thereof, and a cylinder housing axially slidably fitted to the piston member; and (d) a plurality of mold clamping cylinders. A movable die plate connected to the cylinder housing and having a movable die attached to face the fixed die, and the movable die plate is applied toward the fixed die plate by the die clamping cylinder. A molding machine that performs molding between the fixed molding die and the movable molding die by being pressed is, for example, a real machine shovel 64-1.
It is described in Japanese Patent No. 0394. In such a molding machine, since the mold clamping cylinder is integrally provided on the guide post, a connecting plate or the like is provided at the tip of the guide post, and the mold clamping cylinder is arranged on the connecting plate or the like. The device is made compact as compared with the case where

[0003]

In the conventional mold clamping device, since the cylinder housing of the mold clamping cylinder and the movable die plate are integrally connected, the periphery of the movable die plate is fixed during the mold clamping. When the movable die plate bends and deforms when pressed against the die plate, the posture of the cylinder housing of the mold clamping cylinder connected to the movable die plate also changes,
There is a problem that unreasonable force may be applied between the guide post and the piston member to break the fitting post, and the fitting sliding portions of these parts may be unevenly worn at an early stage to significantly shorten the life.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent breakage and shortening of life of a mold clamping cylinder due to bending deformation of a movable die plate during mold clamping. Especially.

[0005]

In order to achieve such an object, the cylinder housing of the mold clamping cylinder and the movable die plate may be swingably connected. The present invention includes (a) a fixed molding die. Fixed die plate to which is attached, (b) a plurality of guide posts that are erected on the fixed die plate around the fixed mold, and (c)
A plurality of die clamping cylinders each comprising a piston member integrally provided on the guide post, a cylinder housing slidably fitted to the guide post and the piston member, and (d) A movable die plate connected to the cylinder housings of a plurality of mold clamping cylinders and having a movable molding die attached so as to face the fixed molding die. In a mold clamping device of a molding machine for molding between the fixed molding die and the movable molding die by being pressed toward a fixed die plate,
(E) A sliding member is provided at a connecting portion between the movable die plate and the cylinder housing, the sliding members being in contact with each other via a spherical surface having a spherical center substantially located on a center line of the cylinder housing.

[0006]

In the mold clamping device of such a molding machine, since the sliding member is arranged at the connecting portion between the cylinder housing of the mold clamping cylinder and the movable die plate, it is movable during mold clamping. Even if the die plate bends and deforms, the spherical movement of the sliding member suppresses a change in the posture of the cylinder housing, and an unreasonable force is prevented from being applied to the guide post and the piston member. As a result, damage to the mold clamping cylinder due to the bending deformation of the movable die plate is avoided, and uneven wear in the fitting sliding portion of the mold clamping cylinder is reduced to improve the life.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2 are a plan view and a front view showing the outline of a pressure casting machine 10 as a molding machine, in which a fixed molding die 14 is mounted upward on a base 12 functioning as a fixed die plate. At the four corners of the base 12 around the fixed mold 14, guide posts 16 are vertically erected parallel to each other and fixed in position. The movable die plate 2 is attached to these guide posts 16 via a mold clamping cylinder 18.
0 is arranged substantially parallel to the base 12, and a movable molding die 22 is attached downward to the lower surface of the movable die plate 20 so as to face the fixed molding die 14. The movable die plate 20 is connected to the cylinder housing 24 of the mold clamping cylinder 18 and is movable up and down while being guided by the guide post 16 together with the cylinder housing 24. The movable die plate 20 is arranged at the upper left corner and the lower right corner in FIG. A piston rod 30 of a mold opening / closing cylinder 28 is connected to a cylinder housing 24 of the pair of mold clamping cylinders 18 provided via a connecting member 26. Cylinder housing 32 of mold opening / closing cylinder 28
Is fixed upward on a bracket 34 fixed to the base 12 in parallel with the guide post 16, and the piston rod 30 axially slidably fitted to the cylinder housing 32 thereof projects to pull in. As a result, the movable die plate 20 is moved up and down together with the cylinder housing 24 of the mold clamping cylinder 18.

As shown in FIG. 3, the mold clamping cylinder 18 is configured to include a piston member 36 integrally provided at an intermediate position in the axial direction of the guide post 16, and the cylinder housing 24. Are axially slidably fitted to their respective guide posts 16 and piston members 36. Sealing members are respectively provided on the inner peripheral surface of the cylinder housing 24 slidingly contacting the guide posts 16 and the outer peripheral surface of the piston member 36 slidingly contacting the cylinder housing 24, and the space between them is oil-tightly sealed. The guide post 16 and the piston member 36 are also oil-tightly sealed by an O-ring. As a result, a first hydraulic chamber 38 whose volume increases when the cylinder housing 24 descends, that is, when the base 12 and the movable die plate 20 approach each other is formed below the piston member 36, and above the piston member 36. A second hydraulic chamber 40 whose volume increases when the cylinder housing 24 is raised, that is, when the base 12 and the movable die plate 20 are separated from each other, is formed. The pressure receiving area of this mold clamping cylinder 18, that is, the driving force is sufficiently larger than that of the mold opening / closing cylinder 28, and as shown in FIG.
The movable die plate 20 causes the cylinder housing 24 to
When the fixed molding die 14 and the movable molding die 22 are closed, the hydraulic pressure is applied to the first hydraulic chamber 38 so that the fixed molding die 14 and the movable molding die 22 are closed.
The movable mold 22 is firmly clamped with a force larger than that of the mold opening / closing cylinder 28, for example, a force of about 4.9 × 10 ⁶ N (≈500 t) for one mold clamping cylinder 18.

The cylinder housing 24 of the mold clamping cylinder 18 is vertically inserted through an insertion hole 42 formed in the movable die plate 20, and the insertion hole 42 is formed at the upper end of the cylinder housing 24. A flange 44 having a larger diameter than the above is provided. Flange 44
Is located on the movable die plate 20, and has an inner diameter smaller than the outer diameter of the flange 44 of the movable die plate 20.
A ring-shaped mounting block 48 having 6 is fixedly mounted on the movable die plate 20, so that the cylinder housing 24 and the movable die plate 20 are connected. A spherical washer 50 is inserted as a sliding member between the lower surface of the flange 44 and the upper surface of the movable die plate 20.
The spherical washer 50 has a lower ring member 52 whose upper surface has a concave conical surface shape, and a lower surface which is a spherical surface whose spherical center is located on the center line O ₁ of the cylinder housing 24 and is mounted on the lower ring member 52. And the upper ring member 54 placed. Further, between the insertion hole 42 and the cylinder housing 24, a small gap of, for example, about 5 mm in diameter is provided, and from the upper end of the spherical washer 50 to the lower surface of the inward flange 46 of the mounting block 48. Is slightly larger than the thickness of the flange 44, so that the cylinder housing 24 and the movable die plate 20 can be slightly displaced relative to each other.

A concave molding surface is provided on each of the upper surface of the fixed molding die 14 and the lower surface of the movable molding die 22, and the movable die plate 20 is lowered to close the two molding dies to thereby perform casting. A product cavity 56 (see FIG. 7) corresponding to the product to be formed is formed. In the product cavity 56, for example, from a molten metal holding container (not shown) provided below the base 12,
A molten metal such as an aluminum alloy is supplied as a molten material by a pressurizing pump or the like, and a piston of a pressurizing cylinder 58 arranged in the forming dies 14 and 22 is projected while the supply passage is closed. As a result, for example, 4.9 × 10 ⁷ to 1 is added to the molten metal in the product cavity 56.
4.7 × 10 ⁷ Pa (≈500 to 1500 kgf / cm
² ) High pressure of about ² ) is applied. Before the molten metal is supplied, the inside of the product cavity 56 is previously set to 13.3 × 10 ² Pa (≈10 ton by a vacuum device).
The pressure is reduced to about rr) or less. The movable mold 22 is also provided with an ejector pin, and is driven by an ejector air cylinder 60 provided on the movable die plate 20 to release a cast product from the movable mold 22. It is supposed to do.

On the other hand, the pressure casting machine 10 is equipped with the hydraulic circuit shown in FIGS. 4 and 5 in order to supply hydraulic oil to the mold opening / closing cylinder 28 and the mold clamping cylinder 18. .. FIG. 4 is a diagram showing a mold opening / closing hydraulic circuit 62 that supplies hydraulic oil to the mold opening / closing cylinder 28. The hydraulic oil pumped from a tank 68 by a hydraulic pump 66 rotatably driven by an electric motor 64 is not shown. The oil is supplied to the oil supply passage 70 via a relief valve or the like. The supply oil passage 70 is provided with a check valve 72 and a pressure reducing valve 74,
A four-position pilot switching valve 76 is connected, and a gas charging accumulator 78 is connected between the check valve 72 and the pressure reducing valve 74. The four-position pilot switching valve 76 shuts off the supply oil passage 70 from the first position where the supply oil passage 70 is connected to the mold closing side oil passage 80 and the mold opening side oil passage 82 is connected to the relief oil passage 84. The mold closing side oil passage 80 and the mold opening side oil passage 82 are connected to the relief oil passage 84.
To the second position connected to the oil supply passage 70 and the oil passage 70 on the mold closing side.
0 and the third position for connecting the mold opening side oil passage 82 and blocking the relief oil passage 84, and connecting the supply oil passage 70 to the mold opening side oil passage 82 and the mold closing side oil passage 80 for the relief oil passage 84. The pilot oil pressure is generated in the pilot oil passage 86 at the first position and the pilot oil pressure is generated in the pilot oil passage 88 at the fourth position.

A pilot check valve 9 is provided in the mold closing side oil passage 80.
0, flow rate adjusting valve 92, and flow divider valve 94
Are connected to the mold closing side hydraulic chambers 96 of the pair of mold opening / closing cylinders 28, while the pilot check valve 98, the counter balance valve 100, and the flow rate adjusting valve 102 are provided in the mold opening side oil passage 82. , And a flow divider valve 104 are provided, and are connected to the respective mold opening side hydraulic chambers 106 of the pair of mold opening / closing cylinders 28. A pilot oil passage 86 is connected to the check valve and the check valve 98 of the flow rate adjusting valve 92, and the four-position pilot switching valve 76 is switched to the first position to generate pilot hydraulic pressure. Be released. A pilot oil passage 88 is connected to the check valves of the counter balance valve 100, the flow rate adjusting valve 102, and the check valve 90.
The position pilot switching valve 76 is switched to the fourth position and the pilot hydraulic pressure is generated, whereby the position pilot switching valve 76 is opened.

FIG. 5 is a diagram showing a mold clamping hydraulic circuit 110 for supplying hydraulic oil to the mold clamping cylinder 18, in which hydraulic oil pumped from the tank 68 by a hydraulic pump 114 rotatably driven by an electric motor 112. Is supplied to the oil supply passage 116 via a relief valve or the like (not shown). A check valve 118 is provided in the oil supply passage 116, is connected to the three-position switching valve 120, and the check valve 11 is provided.
A gas-filled accumulator 122 is connected between the 8 and 3-position switching valve 120. The three-position switching valve 120 is
The first position where the supply oil passage 116 is connected to the mold clamping side oil passage 124 and the mold releasing side oil passage 126 is connected to the relief oil passage 128, and the supply oil passage 116 is cut off and the mold clamping side oil passage 124 and the mold A second position where the release side oil passage 126 is connected to the relief oil passage 128, and a third position where the supply oil passage 116 is connected to the mold release side oil passage 126 and the mold clamping side oil passage 124 is connected to the relief oil passage 128. It can be switched to and. The mold check side oil passage 124 and the mold release side oil passage 126 are respectively provided with pilot check valves 130,
132 is provided, and the mold clamping side oil passage 124 is provided.
Is connected to the first hydraulic chamber 38 of the mold clamping cylinder 18,
The mold release side oil passage 126 is connected to the second hydraulic chamber 40 of the mold clamping cylinder 18. The check valve 130 is opened by supplying operating oil from the supply oil passage 116 to the mold releasing side oil passage 126, and the check valve 132 supplies operating oil from the supply oil passage 116 to the mold clamping side oil passage 124. It is opened by being done.

The mold clamping side oil passage 124 and the mold opening side oil passage 126 are connected to each other by a communication oil passage 134 between the check valves 130 and 132 and the mold clamping cylinder 18, respectively. A pilot check valve 136 is provided in the passage 134. This pilot check valve 136 is provided from the mold opening side oil passage 126 to the mold clamping side oil passage 12
The hydraulic oil is always allowed to flow to the fourth side, and when hydraulic oil is supplied from the supply oil passage 116 to the pilot oil passage 142 via the flow rate adjusting valve 138 and the two-position switching valve 140, it is opened, and the oil is released in both directions. It allows the circulation of hydraulic fluid. The two-position switching valve 140 can be switched between a first position that connects the supply oil passage 116 to the pilot oil passage 142 and a second position that connects the pilot oil passage 142 to the relief oil passage 128, and is always a spring. It is adapted to be held in the second position. Further, the check valve 130 in the mold clamping side oil passage 124 and the mold clamping cylinder 1
8, a relief oil passage 128 is connected via a throttle 144 and a two-position switching valve 146. The two-position switching valve 146 includes the mold clamping side oil passage 124 and the relief oil passage 12
It is switched between a first position for connecting 8 and a second position for shutting them off, and is always held in the second position by a spring.

Each of the four mold clamping cylinders 18 is provided with a hydraulic circuit including the switching valves 120, 140, 146, etc., and the supply oil passage 116 is connected to the accumulator 122 at a connection position. It is branched into four on the downstream side and is connected to the hydraulic circuit of each mold clamping cylinder 18.

The pressure casting machine 10 is designed to be sequence-controlled by a controller (not shown). For example, the movable die plate 20 is lowered to close the movable molding die 22 and the fixed molding die 14. A limit switch 150 (see FIG. 3) for detecting that the operation is performed is provided with a detection device for detecting the operating state of each part, and a signal output from the detection device or a predetermined set time is set. Based on this, the switching valves 76, 120, 140, 146, etc. are switched in a predetermined order. The switching valves 120, 140, 146 of the four mold clamping cylinders 18 are switched simultaneously. The mold opening / closing and mold clamping operations of the pressure casting machine 10 will be described below with reference to the time chart of FIG. It should be noted that FIG. 6 is for explaining the operation sequence of each part, and the time is not necessarily accurate.

First, as shown in FIGS. 1 and 2, the movable mold 22 is separated from the fixed mold 14,
In the initial state where the movable die plate 20 is located at the rising end, when the 4-position pilot switching valve 76 of the die opening / closing hydraulic circuit 62 is switched to the first position, the supply oil passage 70 causes the die closing side oil passage 80. And the mold opening side oil passage 82 is connected to the relief oil passage 84, and the check valve and the check valve 98 of the flow rate adjusting valve 92 are opened by the hydraulic pressure of the pilot oil passage 86. As a result, the hydraulic oil pumped up by the hydraulic pump 66 is caused to flow substantially uniformly from the supply oil passage 70 through the mold closing side oil passage 80 into the mold closing side hydraulic chambers 96 of the pair of mold opening / closing cylinders 28. The hydraulic oil pushed out from the mold opening side hydraulic chamber 106 is returned from the mold opening side oil passage 82 through the relief oil passage 84 to the inside of the tank 68, and the movable die plate 20 is lowered to move the movable molding die 22 and the fixed molding. The mold 14 is closed. At this time, the three-position switching valve 120 and the two-position switching valves 140 and 146 of the mold clamping hydraulic circuit 110 are both held in the second position,
The flow of hydraulic oil from the hydraulic chambers 38, 40 of the mold clamping cylinder 18 to the relief oil passage 128 side is achieved by the check valves 130, 132.
However, the flow of the working oil from the mold releasing side oil passage 126 to the mold clamping side oil passage 124 side is allowed from the communicating oil passage 134 through the check valve 136. At the same time, by lowering the cylinder housing 24, the hydraulic oil pushed out of the second hydraulic chamber 40 flows into the first hydraulic chamber 38 via the communication oil passage 134. Time t _{1 in} FIG. 6 is the time when the movable die plate 20 is lowered and the movable mold 22 and the fixed mold 14 are closed in this way.

When the limit switch 150 detects that the movable mold 22 and the fixed mold 14 are closed, the three-position switching valve 12 of the mold clamping hydraulic circuit 110 is closed.
0 is switched to the first position, the supply oil passage 116 is connected to the mold clamping side oil passage 124 and the mold releasing side oil passage 126.
Is connected to the relief oil passage 128. As a result, the hydraulic oil pumped up by the hydraulic pump 114 flows from the supply oil passage 116 through the mold clamping side oil passage 124 into the first hydraulic chamber 38 of the mold clamping cylinder 18, and is connected to the cylinder housing 24. The movable mold 22 is firmly pressed against the fixed mold 14 via the movable die plate 20.
At this time, since the movable molding die 22 and the fixed molding die 14 are already closed, a large pressurization force is generated while the amount of the hydraulic oil flowing into the first hydraulic chamber 38 is slightly increased, while the second hydraulic chamber is generated. The hydraulic oil pushed out of the inside 40 is the oil passage 12 on the mold clamping side.
The oil is returned from the relief oil passage 128 into the tank 68 via the check valve 132 opened based on the hydraulic pressure of No. 4. The time t _{2 in} FIG. 6 is the time during which the pair of molds 14 and 22 are firmly clamped by the mold clamping cylinder 18 as described above.

Then, with the pair of molding dies 14 and 22 clamped in this manner, the product cavity 5
The inside of 6 is depressurized and the molten metal is supplied, and then the molten metal is pressurized by the pressurizing cylinder 58 in a state where the supply path of the molten metal is closed. Time t _{3 to} t _{4 in} FIG. 6 is a pressurizing time by the pressurizing cylinder 58, during which the molten metal is solidified and the product cavity 5 is pressed.
A cast product having a shape corresponding to 6 is formed.

When the pressurization by the pressurizing cylinder 58 is released, the three-position switching valve 120 of the mold clamping hydraulic circuit 110 is released.
Is returned to the second position and the two-position switching valve 1
46 is switched to the first position, and the first hydraulic chamber 38 causes the mold clamping side oil passage 124, the throttle 144, and the two-position switching valve 14 to move.
6 to communicate with the relief oil passage 128. As a result, the hydraulic pressure in the first hydraulic chamber 38 is released, and the mold clamping state between the movable molding die 22 and the fixed molding die 14 is released.
Time t _{5 in} FIG. 6 is the time when the mold clamping state between the movable molding die 22 and the fixed molding die 14 is released in this way.

Thereafter, the two-position switching valve 146 is returned to the second position, the mold clamping side oil passage 124 and the relief oil passage 128 are cut off, and the two-position switching valve 140 is switched to the first position. By opening the check valve 136 based on the pilot oil pressure in the pilot oil passage 142, the working oil is allowed to flow from the mold clamping side oil passage 124 to the mold releasing side oil passage 126. Then, in this state, the four-position pilot switching valve 76 of the hydraulic circuit for mold opening / closing 62 moves to the fourth position.
When switched to the position, the supply oil passage 70 is connected to the mold opening side oil passage 82 and the mold closing side oil passage 80 is connected to the relief oil passage 84, and the oil pressure in the pilot oil passage 88 causes the counter balance valve 100 to flow. The check valve of the adjusting valve 102 and the check valve 90 are opened. As a result, the hydraulic oil pumped up by the hydraulic pump 66 passes from the supply oil passage 70 through the die opening side oil passage 82 to the pair of mold opening / closing cylinders 28.
The hydraulic oil that is made to flow into the mold opening side hydraulic chamber 106 substantially uniformly and is pushed out from the mold closing side hydraulic chamber 96 is returned to the tank 68 from the mold closing side oil passage 80 through the relief oil passage 84. The movable die plate 20 is raised, and the movable mold 22 and the fixed mold 14 are opened. At this time, the mold clamping cylinder 18 together with the movable die plate 20.
Although the cylinder housing 24 of is also raised, the two-position switching valve 140 is switched to the first position in the mold clamping hydraulic circuit 110 as described above, and the mold clamping side oil passage 124 is moved to the mold releasing side oil passage 126 side. Since the hydraulic oil is allowed to flow, the hydraulic oil pushed out of the first hydraulic chamber 38 as the cylinder housing 24 moves upward is passed from the communication oil passage 134 to the second hydraulic pressure via the check valve 136. It flows into the chamber 40. In the process of opening the mold, the air cylinder 60 is operated, the ejector pin provided in the movable mold 22 is projected, and the cast product is blown off from the movable mold 22.

As described above, the pressure casting machine 10 of the present embodiment has a mold opening / closing cylinder 28 and a mold clamping cylinder 18.
, And the movable mold 22 and the fixed mold 14 are opened and closed by the mold opening and closing cylinder 28. However, since a large driving force is not required when opening and closing the mold, the mold opening and closing cylinder 28 A relatively small pressure receiving area can be used as the pressure receiving area, and the mold can be opened and closed in a short time even if the discharge capacity of the hydraulic pump 66 is small. On the other hand, as the mold clamping cylinder 18 for clamping the fixed mold 14 and the movable mold 22, the pressure is received so that a large mold clamping force that can counter the pressure of the molten metal by the pressure cylinder 58 is obtained. Although a large area is required, when the mold opening / closing cylinder 28 is used to open / close the mold, working oil is allowed to flow between the pair of hydraulic chambers 38, 40.
Since it suffices to apply the hydraulic pressure to the first hydraulic chamber 38 with the hydraulic pressures 22 and 22 closed, the amount of hydraulic oil supplied to the first hydraulic chamber 38 is small, and the discharge capacity of the hydraulic pump 114 is small. Even in a short time, a large mold clamping force can be generated. Therefore, while the hydraulic unit including the hydraulic pumps 66 and 114 is made compact, casting can be performed in a short cycle time and a large mold clamping force can be obtained.

Further, in the pressure casting machine 10 of this embodiment, four mold clamping cylinders 18 are arranged around the movable molding die 22, and the movable die plate 20 is attached from the mounting portion of the movable molding die 22. Also, since the outer peripheral side portion is pressed toward the base 12, the peripheral portions of the fixed molding die 14 and the movable molding die 22, that is, the mold matching portion located on the outer peripheral side of the product cavity 56 is particularly Firmly and substantially evenly adhered. Therefore, even though a high pressure is applied to the molten metal by the pressurizing cylinder 58 during casting, the molten metal is prevented from entering the mold matching portion, and burrs are generated in the cast product or the molten metal leaks. It is satisfactorily avoided to put out.

On the other hand, by pressing the periphery of the movable die plate 20 toward the base 12 in this manner, the molding dies 14 and 22 are firmly clamped, and at the same time, the molten metal in the product cavity 56 is high. In the pressure casting machine 10 to which pressure is applied, the peripheral edge of the movable die plate 20 may warp downward as shown in FIG. In that case, if the movable die plate 20 and the cylinder housing 24 of the mold clamping cylinder 18 are integrally fixed,
The posture of the cylinder housing 24 changes with the bending deformation of the movable die plate 20, and the guide posts 16 and the guide posts 16 that are erected substantially vertically on the base 12.
An unreasonable force may be applied to the piston member 36 provided integrally with the mold clamping cylinder 18 and the fitting sliding portion may be unevenly worn early.

On the other hand, in this embodiment, the cylinder housing 24 of the mold clamping cylinder 18 and the movable die plate 2 are
0 and a spherical washer 50 are arranged so that they can be slightly displaced relative to each other. Therefore, even if the movable die plate 20 bends and deforms during mold clamping, the spherical washer 50 slides spherically to cause the cylinder to move. The posture change of the housing 24 is suppressed, and an unreasonable force is prevented from being applied to the guide post 16 and the piston member 36. That is, the spherical washer 50 shown by the solid line in FIG.
With the movable molding die 22 and the fixed molding die 14 closed by the above, both ring members 52 and 54 are substantially concentric in this case, but from this state, the cylinder housing 24 of the mold clamping cylinder 18 moves downward. When the movable die plate 20 is pushed down and accordingly the peripheral edge portion of the movable die plate 20 is flexibly deformed so as to be displaced downward, the lower ring member 52 on the movable die plate 20 side has its center line O as shown by the alternate long and short dash line. ₂ is tilted with respect to the guide post 16,
The upper ring member 54 on the cylinder housing 24 side can slide straight down while sliding on the upper surface of the lower ring member 52, so that the cylinder housing 24 is held concentrically with the guide post 16 and the guide post 16 is inclined. There is nothing to do. As a result, the mold clamping cylinder 1 caused by the bending deformation of the movable die plate 20.
8 is prevented from being damaged and the mold clamping cylinder 18
The uneven wear in the fitting sliding portion of is reduced and the life is improved. The gap between the cylinder housing 24 and the movable die plate 20 is predetermined so as to allow such relative displacement.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above embodiment, the case where the present invention is applied to the pressure casting machine 10 has been described. However, a normal casting machine or an injection molding machine that does not have the pressure cylinder 58, a bending process, a drawing process, etc. The present invention can be applied to a press device for performing the above.

In the above embodiment, the mold clamping cylinder 1 is used.
Although 8 and the mold opening / closing cylinder 28 are provided separately, the mold opening / closing cylinder 28 may be omitted and the mold opening / closing and the mold closing may be performed only by the mold closing cylinder 18. The disposition position, disposition number, size, etc. of the mold clamping cylinder 18 and the mold opening / closing cylinder 28 may be appropriately changed as necessary.

Further, the mold clamping cylinder 18 and the mold opening / closing cylinder 28 are provided with separate hydraulic circuits 110 and 62, but the hydraulic pumps 114 and 66 can be constituted by one hydraulic pump. The circuit configuration of the hydraulic circuit can be appropriately changed as necessary.

In the above embodiment, the mold clamping cylinder 1 is used.
The spherical washer 50 is disposed between the cylinder housing 24 of FIG. 8 and the movable die plate 20, and the lower surface of the upper ring member 54 is spherical.
The upper ring member 54 and the upper ring member 54 may be arranged upside down, and the upper surface of the lower ring member 52 does not necessarily have to be a concave conical surface, and even if the intermediate portion in the radial direction is slightly convex. It doesn't matter. The concave conical surface or spherical surface may be provided integrally with the movable die plate 20 or the cylinder housing 24.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a pressure casting machine to which the present invention is applied.

FIG. 2 is a front view of the pressure casting machine of FIG.

FIG. 3 is a vertical cross-sectional view of a mold clamping cylinder in the pressure casting machine of FIG.

FIG. 4 is a circuit diagram showing a die opening / closing hydraulic circuit of the pressure casting machine of FIG. 1.

5 is a circuit diagram showing a mold clamping hydraulic circuit of the pressure casting machine of FIG. 1. FIG.

FIG. 6 is a time chart explaining the operation of the pressure casting machine of FIG.

FIG. 7 is a schematic view showing a mold clamping state of the pressure casting machine of FIG.

FIG. 8 is a diagram illustrating the operation of a spherical washer provided in the pressure casting machine of FIG.

[Explanation of symbols]

 10: Pressure casting machine (molding machine) 12: Base (fixed die plate) 14: Fixed molding die 16: Guide post 18: Clamping cylinder 20: Movable die plate 22: Movable molding die 24: Cylinder housing 36: Piston Member 50: Spherical washer (sliding member)

Claims (1)

[Claims] 1. A fixed die plate to which a fixed molding die is attached, a plurality of guide posts provided upright on the fixed die plate around the fixed molding die, and a piston integrally provided on the guide post. A plurality of mold clamping cylinders each of which includes a member, a cylinder housing axially slidably fitted to the guide post, and a piston member; and a plurality of mold clamping cylinders connected to the cylinder housings of the plurality of mold clamping cylinders. A movable die plate to which a movable die is attached so as to face the fixed die, and the fixed die by pressurizing the movable die plate toward the fixed die plate by the die clamping cylinder. In a mold clamping device of a molding machine for molding between a movable die plate and a movable molding die. The connecting portion between grayed, molding machine mold clamping device being characterized in that disposed a sliding member in contact with each other via a spherical surface center of the sphere on the center line of the cylinder housing is substantially located.