JP2003340549A - Squeezing apparatus of non-flask molding machine for mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a squeezing apparatus of a non-flask molding machine for a mold, capable of effectively molding a high quality mold with low cost and in a short molding cycle. <P>SOLUTION: This squeezing machine has a first moving mechanism and a second moving mechanism respectively including first oil-pressure cylinders 32a, 32b and second oil-pressure cylinders driven independently with each other. In accordance with operation of the first cylinders 32a and 32b, two squeezing plates 10 and 12 are moved so that the first moving mechanism forms a molding space 52 in two molding flasks 46, 46 arrayed between the two squeezing plates 10 and 12. On the other hand, in accordance with operation of the second cylinder 33, the two squeezing plates 10 and 12 are moved to approach each other so that the second moving mechanism squeezes foundry sand 56 packed in each molding space. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze device for a frameless mold making machine, and more particularly, it is arranged between two squeeze plates by moving the two squeeze plates close to each other by the operation of a hydraulic cylinder. A squeeze device for a frameless mold making machine, in which a molding space for a desired mold is formed in each of two molds and the molding sand filled in each molding space is compacted, is improved. It is related to the structure.

[0002]

2. Description of the Related Art Conventionally, as a type of mold making machine, two molds having a cylindrical frame shape are sandwiched between pattern plates having a model integrally provided on the surface, and the respective molds are formed. Two squeeze plates that are arranged so as to be able to approach / separate from each other with the two molds in between while the two squeeze plates are butted against each other so as to be closed by the pattern plate and held. Is fitted into the other opening of each of the molds to form a predetermined molding space in each of the molds, and in each of the molding spaces, one of the facing parts of the peripheral wall portion of each of the molds is formed. Through a sand supply port provided, filled with molding sand, further, by compacting the molding sand filled in each of the molding space with each squeeze plate, a pair of frameless molds were molded. Frameless Type molding machine are known.

By the way, in such a frameless mold making machine, two squeeze plates are fitted into the respective molds to form a molding space, and the molding sand filled in the molding space is compacted. Equipped with a squeeze device for. That is, such a squeeze device generally includes two hydraulic cylinders that are respectively connected to two squeeze plates, and by causing the two squeeze plates to move closer to each other as the hydraulic cylinders extend. , Each squeeze plate is fitted into the outer opening of each mold to form a molding space in each mold, and two squeeze plates are filled with molding sand in each molding space. By moving the molds closer to each other, the molding sand filled in each molding space can be compacted.

However, as a result of various investigations by the present inventors regarding the structure of such a conventional squeeze device,
It has been found that the conventional squeeze device has room for improvement in order to reduce the molding cost and the molding cycle.

That is, in order to shorten the molding cycle in the squeeze device, the two squeeze plates are moved close to each other until they are fitted in the respective molds to form a molding space in each of the molds. It is necessary to configure so that a large driving speed for these two squeeze plates can be exhibited, and in order to reduce the molding cost, a small size of a pressure oil supply source such as a hydraulic pump that supplies pressure oil to a hydraulic cylinder. However, in the conventional squeeze device, the squeeze plate is used so that a sufficient compaction force (pressurizing force) can be exerted on the molding sand filled in the molding space. Since the connected hydraulic cylinders are configured with a large bore (inner diameter), the driving speed for the squeeze plate is increased, and the hydraulic cylinders are further supplied. It is was difficult that it allowed reducing the amount of pressure oil to achieve the miniaturization of the pressurized oil supply source.

Of course, if a hydraulic cylinder having a small bore is used as the hydraulic cylinder connected to the squeeze plate, it is possible to easily reduce the molding cost and shorten the molding cycle. The compaction force against the found foundry sand becomes smaller, and as a result,
The strength and hardness of the mold to be molded are reduced, which causes a problem that the quality of the mold is deteriorated.

[0007]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is to reduce the compaction force against the molding sand in the molding space. In addition, it is possible to effectively achieve downsizing of the pressure oil supply source by decreasing the amount of pressure oil supplied to the hydraulic cylinder and increase of the drive speed for the squeeze plate, thus reducing the molding cost and the molding cycle. It is an object of the present invention to provide an improved structure of a squeeze device of a frameless mold making machine capable of molding a high-quality mold while shortening the length.

[0008]

In order to solve the above problems, the present invention includes first and second squeeze plates that are arranged to face each other so that they can move toward and away from each other, and a predetermined hydraulic cylinder. , By the operation of the hydraulic cylinder,
A moving mechanism that moves the two squeeze plates closer to each other, and by moving the two squeeze plates closer to each other by the moving mechanism, the two squeeze plates are opposed to each other. In the above, in the other opening of each of the two molds having a cylindrical frame shape, which are arranged in abutment while sandwiching the pattern plate between them so that one opening is closed, Fit two squeeze plates respectively to form a predetermined molding space in each mold,
With the molding sand filled in each molding space, the two squeeze plates fitted in each mold are moved closer to each other to tighten the molding sand filled in each molding space. In the squeeze device of the frameless mold making machine that is set, the moving mechanism,
A first hydraulic cylinder is included, and the first and second two squeeze plates are mutually connected so that the molding space is formed in each of the two molds by the operation of the first hydraulic cylinder. It includes a first moving mechanism for moving closer to each other, and a second hydraulic cylinder that is operated independently of the first hydraulic cylinder. And a second moving mechanism for moving the two squeeze plates closer to each other so that the filled molding sand is compacted. The squeeze device of the machine is the main point.

That is, in the squeeze device of the frameless mold making machine according to the present invention, a first hydraulic cylinder and a second hydraulic cylinder which are operated independently of each other are provided. The first squeeze plate has a first moving mechanism and a second moving mechanism, and the first hydraulic cylinder in the first moving mechanism of the two moving mechanisms is actuated so that the two squeeze plates move between them. The molds are moved closer to each other until they are fitted into the two molds arranged in the two molds, and a molding space for giving a target mold can be formed in each of the molds. With the molding sand filled in each of the formed molding spaces, the second hydraulic cylinder in the second moving mechanism is operated to fit into each mold. The squeeze plates that have been inserted are moved closer to each other, and the molding sand filled in the molding spaces can be pressed and compacted by the squeeze plates. .

Therefore, in such a squeeze device,
For example, the first hydraulic cylinder in the first moving mechanism may be a hydraulic cylinder with a small bore, while the second hydraulic cylinder in the second moving mechanism may be a hydraulic cylinder with a large bore. Done,
By operating such a first hydraulic cylinder, the squeeze plates are moved when the two squeeze plates are moved close to each other until they are fitted into the respective molds so that a molding space is formed in each mold. The driving speed for the plates can be effectively increased, and the two squeeze plates are brought closer to each other so that the molding sand filled in each molding space is compacted by the operation of the second hydraulic cylinder. It is possible to sufficiently secure the pressing force exerted by each squeeze plate against the foundry sand when it is moved.

Moreover, in the squeeze device of the frameless mold making machine according to the present invention, the bore of the first hydraulic cylinder in the first moving mechanism is made small, so that the first hydraulic cylinder and the second moving cylinder move. The amount of pressure oil supplied to the second hydraulic cylinder in the mechanism can be advantageously reduced.

Therefore, when the squeeze device of the frameless mold making machine according to the present invention as described above is used, the amount of pressure oil supplied to the hydraulic cylinder can be reduced without lowering the compaction force against the molding sand in the molding space. It is possible to effectively achieve the downsizing of the pressure oil supply source and the increase of the driving speed for the squeeze plate by reducing the number of moldings, thereby reducing the molding cost and shortening the molding cycle, as well as achieving excellent mechanical properties. This makes it possible to extremely advantageously realize the molding of a high-quality mold having strength and sufficient hardness.

According to one of the preferred embodiments of the squeeze device of the frameless mold making machine according to the present invention,
The second moving mechanism is connected to each other by a plurality of tie rods that face each other with the first and second squeeze plates interposed therebetween and extend in the facing direction, and integrally move in the facing direction. The first squeeze plate is supported by the first support member and further includes the second squeeze plate and the second squeeze plate. The second hydraulic cylinder is arranged between the second hydraulic cylinder and the second supporting member so as to extend in a direction opposite to the first and second supporting members, and the second hydraulic cylinder is While being in contact with the second squeeze plate and the second support member, the second squeeze plate and the second support member are moved apart from each other by being extended and operated. The first and second two Squeeze plate is to be adapted to be brought relatively close movement.

In the squeeze device having such a structure, the two squeeze plates can be moved relatively closer to each other by extending the second hydraulic cylinder, which is used only one. With respect to the molding sand in each molding space formed in each of the two molds, the pressing force by each squeeze plate can be made to act evenly, whereby, for example,
The second hydraulic cylinder is connected to each of the two squeeze plates, and the operation of each of the second hydraulic cylinders causes the pressure applied by each squeeze plate to act on the foundry sand in each molding space. In comparison with the case of the above configuration, not only can the structure of the second moving mechanism, and thus the entire squeeze device, be simplified and compacted, and the amount of pressure oil supplied to the second hydraulic cylinder can be reduced. It can be effectively reduced, and as a result, further reduction of the molding cost can be advantageously achieved.

According to another advantageous aspect of the squeeze device for a frameless mold making machine according to the present invention, the first moving mechanism has two first hydraulic cylinders, and One of the two first hydraulic cylinders is connected to the second squeeze plate, while the other of them is connected to the second support member,
The operation of the one first hydraulic cylinder causes the second squeeze plate to move closer to the first squeeze plate, while the operation of the other first hydraulic cylinder causes the second support member to move. Is moved away from the second squeeze plate, the first squeeze plate is moved closer to the second squeeze plate.

In the squeeze device having such a structure, for example, the second support member is separated from the second squeeze plate by the extension operation of the other first hydraulic cylinder in the first moving mechanism. When the first squeeze plate is configured to be moved closer to the second squeeze plate, the other first hydraulic cylinder is provided between the first support member and the second support member. It is possible to arrange such that, for example,
The first moving mechanism can be made smaller than in the case where the first hydraulic cylinder is arranged on the opposite side of the first supporting member supporting the first squeeze plate from the second supporting member side. Therefore, the squeeze device as a whole can be advantageously compacted.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to more specifically clarify the present invention, the structure of a squeeze device of a frameless mold making machine according to the present invention will be described in detail with reference to the drawings. And

First, FIGS. 1 and 2 schematically show a squeeze device of a frameless mold making machine having a structure according to the present invention in a plan view and a side view, respectively. As is clear from those figures, the squeeze device of the present embodiment is configured to have the first and second squeeze plates 10 and 12. The two squeeze plates 10 and 12 each have a thick rectangular flat plate shape having a size capable of being internally fitted into two molds having a tubular frame shape described later (Fig. 3), and are arranged to face each other with a predetermined distance.

On the back side of each of the first and second squeeze plates 10 and 12, three first, second and third support plates 1 as support members are provided.
4, 16 and 18 are arranged. That is, all of the three support plates 14 to 18 have the same shape of a thick, long rectangular flat plate having a width larger than that of the two squeeze plates 10 and 12. However, the rear side of the first squeeze plate 10 (see FIG.
(The middle, left side), the second support plate 16 is opposed to it on the back side of the second squeeze plate 12 (right side in FIG. 1), so that The support plate 14 and the second support plate 16 are arranged to face each other with the first and second squeeze plates 10 and 12 interposed therebetween. Further, the third support plate 18 is positioned on the back side of the second squeeze plate 12 so as to face the second squeeze plate 12, so that the second support plate 18 is provided between the second squeeze plate 12 and the second support plate 16. It is arranged to face the support plate 16 and also to face the first support plate 14 via the second squeeze plate 12.

Further, of the three support plates 14 to 18 arranged as described above, a large-diameter through hole 17 is provided in the central portion of the second support plate 16, and The through hole 17 is provided on the side of the second support plate 16 facing the first support plate 14.
A shutter 19 having a size capable of closing the
While being guided by two guide rails 21 and 21 which are provided so as to extend parallel to the inside (direction perpendicular to the paper surface), they are arranged so as to be movable in the vertical direction. The shutter 19 is attached to the upper end of the second support plate 16 with respect to the tip of a piston rod 27 incorporated in a shutter hydraulic cylinder 25 that is arranged so as to extend in the vertical direction via a mounting bracket 23. Are connected at the upper end.

Thus, the shutter hydraulic cylinder 25
However, when the well-known hydraulic pump (not shown) is driven to expand and contract, the piston rod 27 is caused to project / retract, so that the shutter 19 is lowered / raised, so that the second support plate 16 is provided. Through hole 17
Can be closed / opened (see FIG. 3).

On the other hand, such a second support plate 16
Between the first support plate 14 and the first support plate 14 arranged opposite thereto, two tie rods 20, 20 extending a predetermined length in the opposing direction of the first and second support plates 14, 16. In the width direction (vertical direction in FIG. 1), the two support plates 14 and 16 are positioned parallel to each other and horizontally with a distance substantially the same as the width of each of the two support plates 14 and 16. Tie rod 2
0 and 20 are fixed to both widthwise ends of the first and second support plates 14 and 16, respectively. Then, each of the tie rods 20 is fixedly provided on the two holding tables 22, 22 provided in the frameless mold making machine at a predetermined distance in the extending direction of each tie rod 20. Sliding bush 24,
24 is slidably inserted in the extending direction. In addition, here, the insertion portions of the tie rods 20 into the sliding bushes 24, 24 are eccentric from the both ends fixed to the first and second support plates 14, 16 by a predetermined distance toward the central portion. It is said that.

Further, through holes penetrating in the plate thickness direction are provided at both ends in the width direction of the third support plate 18, and a sliding bush 26 is provided in each of the through holes. One by one, they are fitted and fixed in position. The sliding bushes 26 are externally slidable in the extending direction with respect to the two tie rods 20, 20 extending between the sliding bushes 26 and the first and second support plates 14, 16. Has been done. In addition, each tie rod 2
An outer insertion portion of each sliding bush 26 at 0 is a portion between insertion portions of the respective sliding bushes 24 fixed to the holding tables 22 and 22.

Then, here, the first squeeze plate 10 is the second and third support plates 16, 1 in the first support plate 14 arranged as described above.
8 is fixed to the surface facing the surface 8 through a mounting projection 28 integrally formed on the surface facing the surface 8 and three mounting stays 30 bolted to the mounting projection 28. Three mounting stays 3 in which the quiz plate 12 is bolted to the surface of the third support plate 18 facing the first support plate 14 are opposed to the surface.
It is fixedly attached via 0.

Thus, in the squeeze device of this embodiment, the first support plate 14 to which the first squeeze plate 10 is fixed on the side facing the second and third support plates 16 and 18, On the rear surface side of the second squeeze plate 12, the first support plate 14 and the second support plate 16 arranged to face each other are two tie rods 2.
They are connected to each other at 0 and 20, and are always spaced apart by a constant distance, in the extending direction of each tie rod 20, in other words, in the facing direction of the first and second squeeze plates 10 and 12, It can be moved as a whole.
Further, a third support plate 18 having the second squeeze plate 12 fixed to the side opposite to the first support plate 14 is provided.
Also the first support plate 14 and the second support plate 1
4 and 16, while being guided by each tie rod 20, they can be moved in the extending direction of each tie rod 20, that is, in the opposing direction of the first and second squeeze plates 10, 12. Thus, in the first and second support plates 14 and 16, the first and second squeeze plates 10 and 12 are integrally moved in the facing direction, and the third support plate 18 is moved in such a direction. Accompanied by,
The first squeeze plate 10 and the second squeeze plate 12 are configured to be moved toward and away from each other.

By the way, in the squeeze device of this embodiment, since the first and second support plates 14 and 16 are integrally moved as described above and the third support plate 18 is automatically moved, respectively. Two small hydraulic cylinders 32a, 32b and one large hydraulic cylinder 33
And are provided so as to be independently operable.

That is, here, one of the two small hydraulic cylinders 32a, 32b (small hydraulic cylinder 32
a) shows the piston rod 34a built in on the holding table 22 from the first support plate 14 side to the second support plate 16 side (from left side to right side in FIG. 1).
The first and second support plates 14, 1 are adapted to be extended by horizontally projecting toward them.
The two mounting brackets 36, 3 while being placed between
6 is fixedly mounted at 6 and under such mounting at the tip of the piston rod 34a,
It is connected to the second support plate 16 via a connection bracket 38 fixed to the lower surface thereof.

In addition, another small hydraulic cylinder 32b
By horizontally projecting the built-in piston rod 34b from the second support plate 14 side toward the first support plate 16 side (right side to left side in FIG. 1) on the holding table 22. , Two mounting brackets 40, which are arranged so that they can be extended.
It is fixedly attached at 40, and further, under such attachment, at the tip of the piston rod 34b,
It is connected to the third support plate 18 via a connection bracket 42 fixed to the lower surface thereof.

On the other hand, in the large hydraulic cylinder 33, on the surface of the third support plate 18 opposite to the second squeeze plate 12 fixed side, the built-in piston rod 44 is attached to the first support plate 14 side. From the second support plate 16 side (from the left side to the right side in FIG. 1) horizontally, the end portion of the piston rod 44 on the opposite side to the protruding side is arranged so as to be extended. At, on the opposite side of the third support plate 18 is fixedly connected.

Further, in such a large hydraulic cylinder 33, as shown in FIGS. 1 and 2, the first and second two squeeze plates 10 and 12 are arranged at the most distance from each other. In this state, the tip end portion of the piston rod 44, which is in the retracted state, is positioned so as to project to the rear surface side of the second support plate 16 through the through hole 17 provided in the second support plate 16. While the first and second squeeze plates 10 and 12 are moved closer to each other as shown in FIG. 3, the tip of the piston rod 44 causes the second support plate 16 to move. The second support plate 16 is located on the side of the second support plate 16 facing the first support plate 14 by being removed from the through hole 17.

Further, here, in particular, the two small hydraulic cylinders 32a and 32b are configured to have a relatively small inner diameter (bore) of, for example, about 50 mm, while the second hydraulic cylinder 33 is, for example, 110 mm. The two small hydraulic cylinders 32a and 32b and the one large hydraulic cylinder 33 are configured to have a large inner diameter (bore), and serve as a pressure oil supply source such as a known hydraulic pump (not shown). , Are connected to each other.

Thus, in such a squeeze device, the two small hydraulic cylinders 32a, 3a are connected from the hydraulic pump or the like.
By supplying pressure oil (working oil) to 2b, the respective small hydraulic cylinders 32a, 32b are extended and operated at a large working speed with a relatively small amount of pressure oil,
Along with that, the first support plate 14 and the second support plate 16 are rapidly moved integrally from the first support plate 14 side toward the second support plate 16 side, while the third support plate The plate 18 is also quickly moved in a direction opposite to the moving direction of the first and second support plates 14 and 16, and thus the first support plate 14 and the third support plate 18 are fixed. The first and second squeeze plates 10 and 12 are automatically moved toward each other at a high speed.

Here, the two squeeze plates 10 and 12 are moved by the approaching movement of the first and second squeeze plates 10 and 12 accompanying the extension operation of the two small hydraulic cylinders 32a and 32b. Placed in a mutually butted position at a predetermined position between,
When the small hydraulic cylinders 32a, 32a,
The extension operation of 32b is stopped, and the approach movement of the first and second squeeze plates 10 and 12 is stopped (see FIG. 3). As is apparent from this, in the present embodiment, each of the two small hydraulic cylinders 32a and 32b constitutes a first hydraulic cylinder, and these two small hydraulic cylinders 32a and 32b are , First, second, and third support plates 14, 16, 18 and two tie rods 20, 20
Thus, the first moving mechanism is constituted by.

Further, in such a squeeze device, the two small hydraulic cylinders 32a, 32b are extended so that
When the first and second squeeze plates 10 and 12 move close to each other to a predetermined position and are stopped,
The tip of the piston rod 44 of the large hydraulic cylinder 33
It is adapted to be removed from the through hole 17 of the second support plate 16 so as to be positioned on the surface side of the second support plate 16 facing the first support plate 14, and further, in that state. In the above, when the shutter cylinder 25 provided on the upper part of the second support plate 16 is extended and operated, the shutter 19 attached to the tip of the piston rod 27 in the shutter cylinder 25 is lowered, Second support plate 1
The through hole 17 of 6 is closed.

In this way, under the condition that the through hole 17 of the second support plate 16 is closed, pressure oil is supplied from the hydraulic pump or the like to the large hydraulic cylinder 33, so that the large hydraulic pressure is increased. The cylinder 33 closes the through hole 17 of the second support plate 16 and the shutter 19
On the other hand, under the state where the tip of the piston rod 44 is in contact, the piston rod 44 is made to extend while exerting a large hydraulic pressure, and accordingly, the first support plate 14 and the second support plate 16 are While being moved integrally with a large driving force from the one support plate 14 side to the second support plate 16 side, the third support plate 18 also
The first and second squeeze plates 10 and 12 are moved automatically in a direction opposite to the moving direction of the first and second support plates 14 and 16 with a large driving force. It is possible to move them closer to each other.

Incidentally, here, the first and second squeeze plates 10, 1 accompanying the extension operation of the large hydraulic cylinder 33.
When the two squeeze plates 10 and 12 are further moved to a predetermined position from the positions fitted in the respective molds arranged between them by the further closer movement of 2, The extension operation of the hydraulic cylinder 33 is stopped, and the first and second squeeze plates 1 are
The approaching movement of 0 and 12 is stopped (see FIG. 4). As is clear from this, in the present embodiment, the large hydraulic cylinder 33 constitutes the second hydraulic cylinder, and the large hydraulic cylinder 33 and the first, second, and third hydraulic cylinders Support plates 14, 1
The second moving mechanism is constituted by 6, 18 and the two tie rods 20, 20.

By using the frameless mold making machine having the squeeze device of the present embodiment having such a structure,
When molding a target mold, for example, first, referring to FIG.
, Two small hydraulic cylinders 32a, 32
b and the large hydraulic cylinder 33 are contracted to separate the first and second squeeze plates 10 and 12. At this time, the shutter hydraulic cylinder 25 is contracted so that the through hole 1 of the second support plate 16 is retracted.
7, the piston rod 4 of the large hydraulic cylinder 33 is released.
It goes without saying that the tip of 4 is positioned so as to be inserted into the through hole 17.

Next, as shown in FIG. 3, the two molds 4 are provided between the first and second squeeze plates 10 and 12.
The two small hydraulic cylinders 32a are arranged in a state in which the pattern plates 50 and 6, 46 are arranged in abutment with each other while sandwiching the pattern plate 50 integrally formed with the model 48 so that one of the openings thereof is closed. , 32b are extended and operated at a high operating speed with a relatively small amount of pressure oil, so that the first support plate 14 and the second support plate 16 move toward the third support plate 18 side at high speed. While moving it, the third support plate 1
The first and second squeeze plates 10 and 12 fixed to the first and third support plates 14 and 18 are also moved by high speed toward the first support plate 14.
At high speed and move them closer to each other.

Then, when the first and second squeeze plates 10 and 12 are fitted into the outer openings of the respective molds 46 that are arranged in abutment with each other, the two small hydraulic cylinders 32a and 32b have the same structure. The extension operation is stopped to stop the approaching movement of the first and second squeeze plates 10 and 12, thereby forming a molding space 52 for giving a target mold in each mold 46.

At this time, the three support plates 14-18
By the movement of, the large hydraulic cylinder 33 attached to the third support plate 18 is pulled out from the through hole 17 of the second support plate 16, and the tip end portion of the piston rod 44 of the large hydraulic cylinder 33 is moved. When the second support plate 16 is positioned on the first support plate 12 side, the shutter hydraulic cylinder 25 is extended and the shutter 19 closes the through hole 17.

After that, the molding space 52 formed in each of the molds 46 is filled with foundry sand by a known method from the sand supply port 54 provided in the peripheral wall of each of the molds 46. Then, as shown in FIG. 4, when the molding sand 56 is filled in each molding space 52, either or both of the two small hydraulic cylinders 32a and 32b are set in a free state, and the second With the tip of the piston rod 44 in contact with the shutter 19 that closes the through hole 17 of the support plate 16, the large hydraulic cylinder 33
The first support plate 14 is moved to the second support plate 1 by performing the extension operation while exerting a large hydraulic pressure.
6, the third support plate 18 is moved with a large driving force toward the third support plate 18 side, and the third support plate 18 is also moved with a large driving force toward the first support plate 14 side. The first and second squeeze plates 10 and 12 fixed to the first and third support plates 14 and 18 have a large driving force,
Move closer to each other. As a result, each molding space 5
The foundry sand 56 in 2 is compacted with a large pressing force to mold a mold.

Then, after that, the large hydraulic cylinder 33 and the two small hydraulic cylinders 32a and 32b are contracted to move the first support plate 14 to the second support plate 1.
Together with 6, the third support plate 18 is moved away from the third support plate 18, and the third support plate 18 is also moved away from the first support plate 14, whereby the first and second squeeze plates 10, 12 are respectively moved. After being separated from the molds 46 and moved away from each other, the molded molds are separated from the molds 46 by a known method. The separation movement of the first and second squeeze plates 10 and 12 can also be performed at a high speed by the contraction operation of the two small hydraulic cylinders 32a and 32b.

As described above, in the squeeze device of the frameless mold making machine according to the present embodiment, the first and second squeeze plates 10 and 12 are provided in the respective molds 46 arranged between them. When these two squeeze plates 10 and 12 are moved closer to each other until they form the molding space 52 in each of the molds 46, the two squeeze plates 10 and 12 are compared by the extension operation of the small hydraulic cylinders 32a and 32 having a small inner diameter. It is possible to move the two squeeze plates 10 and 12 closer to each other while the mold sand 46 is filled in the molds 46 with a relatively small amount of pressure oil. When making it, two squeeze plates 10,
12 is moved close to each other with a large driving force, and the molding sand 56 filled in each molding space 52 is compacted with a sufficiently large pressing force.

Therefore, in the squeeze device of this embodiment as described above, the first and second squeeze plates 10 and 12 are secured while sufficiently securing the compaction force for the foundry sand 56 in the molding space 52. The pressure oil supply source such as a hydraulic pump is downsized due to the decrease in the amount of pressure oil supplied to the three large and small hydraulic cylinders 32a, 32b, 33 that are operated to move closer, and the high speed of each squeeze plate 10, 12 It is possible to effectively achieve the movement, and thus it is possible to extremely advantageously mold a high-quality mold having excellent mechanical strength and sufficient hardness at a low molding cost and a short molding cycle. Of.

In addition, in the squeeze device according to the present embodiment, the first and second support plates 14 and 16 are connected by the two tie rods 20 and 20 so as to be integrally movable, and Along with the extension operation of the large hydraulic cylinder 33 arranged only between the second support plate 16 and the third support plate 18, the second support plate 16 and the third support plate 18 are The first and second squeeze plates 1 are moved by moving them away from each other.
0 and 12 are moved close to each other, and each molding space 5
Since the molding sand 56 in 2 can be compacted, the molding sand 56 in each molding space 52 is uniformly pressed even though only one large hydraulic cylinder 33 is provided. Therefore, the large hydraulic cylinder 33
It is possible to obtain an advantage that the molding sand 56 in each molding space 52 can be sufficiently compacted while securing the cost saving effect that can be achieved by providing only one.

Further, in such a squeeze device,
First and second support plates 1 that can be integrally moved
The small hydraulic cylinders 32a for moving the 4, 4 by the extension operation are the first and second support plates 14,
The small hydraulic cylinder 32a is arranged between the first support plate 14 and the second support plate 16 on the side opposite to the second support plate 16 side by the extension operation. Plates 14 and 16
It is possible to make the entire squeeze device compact as compared with the case where it is moved.

The specific construction of the present invention has been described in detail above, but this is merely an example, and the present invention is not restricted by the above description.

For example, the size of the inner diameter of each of the small hydraulic cylinder 32 and the large hydraulic cylinder 33 is not limited to the illustrated one at all, and the approaching moving speed of the squeeze plate and the casting sand are required. It is appropriately determined in consideration of the compaction force and the like.

In addition, the two squeeze plates 10 and 12
The arrangement structure of the first support plate 1 is not particularly limited to that shown in the above-described embodiment.
It is also possible to fix these two squeeze plates 10 and 12 to the respective facing surfaces of 4 and the second support plate 16. This allows the third support plate 18 to be advantageously omitted. In addition, when adopting such a structure, for example, the squeeze plate 10 of the first and second support plates 14 and 16,
The small hydraulic cylinder 32 and the large hydraulic cylinder 33 are connected and arranged on the side opposite to the fixed side of 12.

Further, the numbers and positions of the small hydraulic cylinders 32, which are the first hydraulic cylinders, and the large hydraulic cylinders 33, which are the second hydraulic cylinders, and the arrangement structure are also exemplified in the above embodiment. It goes without saying that things are by no means limited.

Furthermore, the first moving mechanism for moving the two squeeze plates closer to each other and the respective molding spaces until the molding spaces are formed in the respective molds arranged between the two squeeze plates. Each structure of the second moving mechanism that moves the two squeeze plates closer to each other so that the molding sand filled therein is compacted,
As long as it includes a first hydraulic cylinder and a second hydraulic cylinder that can be operated independently of each other, the specific structure thereof is not limited in any way.
Of course.

Although not listed one by one, the present invention
It may be carried out in an aspect in which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art, and such an aspect does not depart from the gist of the present invention.
Both are included within the scope of the present invention,
Needless to say.

[0053]

As is apparent from the above description, if the squeeze device of the frameless mold making machine according to the present invention is used,
Effectively reduces the pressure oil supply source by reducing the amount of pressure oil supplied to the hydraulic cylinder and increases the drive speed for the squeeze plate without reducing the compaction force against the molding sand in the molding space. Can be achieved,
While reducing the molding cost and shortening the molding cycle,
This makes it possible to extremely advantageously realize molding of a high-quality mold having excellent mechanical strength and sufficient hardness.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing an example of a squeeze device of a frameless mold making machine having a structure according to the present invention.

FIG. 2 is an explanatory view seen from an arrow II in FIG.

FIG. 3 is an explanatory view showing an example of a process of molding a mold by using the frameless mold molding machine equipped with the squeeze device shown in FIG. 1, which is arranged between two squeeze plates. The figure shows a state in which a molding space for giving a target mold is formed inside each of the two molds.

FIG. 4 is an explanatory view showing another example of a process of molding a mold by using the frameless mold molding machine equipped with the squeeze device shown in FIG. 1, which is formed in each mold. It shows a state in which the molding sand filled in each of the molding spaces is compacted.

[Explanation of symbols]

10 1st squeeze plate 12 2nd squeeze plate 14 1st support plate 16 2nd support plate 18 3rd support plate 20 Tie rod 32 Small hydraulic cylinder 33 Large hydraulic cylinder 46 Form frame 50 Pattern plate 52 Molding space 56 Foundry sand

Continued front page    (72) Inventor Takuji Murase             1-chome, 1-chome, Yono, Oguchi-cho, Niwa-gun, Aichi Prefecture             Hisa Corporation F-term (reference) 4E094 AA03 AA12 AA33

Claims (3)

[Claims] 1. A first squeeze plate and a second squeeze plate, which are arranged to face each other so as to move toward and away from each other, and a predetermined hydraulic cylinder, and by the operation of the hydraulic cylinder,
A moving mechanism that moves the two squeeze plates closer to each other, and by moving the two squeeze plates closer to each other by the moving mechanism, the two squeeze plates are opposed to each other. In the above, in the other opening of each of the two molds having a cylindrical frame shape, which are arranged in abutment while sandwiching the pattern plate between them so that one opening is closed, Fit two squeeze plates respectively to form a predetermined molding space in each mold,
With the molding sand filled in each molding space, the two squeeze plates fitted in each mold are moved closer to each other to tighten the molding sand filled in each molding space. In a squeeze device of a frameless mold making machine configured to be solidified, the moving mechanism includes a first hydraulic cylinder, and by the operation of the first hydraulic cylinder, the molding spaces are respectively formed in the two molds. A first moving mechanism for moving the two first and second squeeze plates closer to each other, and a second hydraulic cylinder that is operated independently of the first hydraulic cylinder. The squeeze play of the two hydraulic cylinders is compacted by the operation of the second hydraulic cylinder so that the foundry sands respectively filled in the two molding spaces are compacted. A squeeze device for a frameless mold making machine, further comprising a second moving mechanism for moving the two closer to each other. 2. The second moving mechanism is connected to each other by a plurality of tie rods which face each other with the first and second squeeze plates sandwiched therebetween and extend in the facing direction, The first squeeze plate is supported by the first support member, and the second squeeze plate is supported by the first support member. The second hydraulic cylinder is disposed between the squeeze plate and the second support member so as to extend in the direction opposite to the first and second support members. The hydraulic cylinder is extended and operated while being in contact with the second squeeze plate and the second support member, so that the second squeeze plate and the second support member are relatively separated from each other. Along with the first The squeeze device for a frameless mold making machine according to claim 1, wherein the second squeeze plate and the second two squeeze plates are moved relatively close to each other. 3. The first moving mechanism has two first hydraulic cylinders, and one of the two first hydraulic cylinders is connected to the second squeeze plate, The other of them is connected to the second support member, and the second squeeze plate is moved closer to the first squeeze plate by the operation of the one first hydraulic cylinder, As the second support member is moved away from the second squeeze plate by the operation of the other first hydraulic cylinder, the first squeeze plate approaches the second squeeze plate. The squeeze device for a frameless mold making machine according to claim 2, wherein the squeeze device is movable.