JP4427770B2 - Method and apparatus for compressing foundry sand - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus suitable for compressing foundry sand in a mold making space.
[0002]
[Prior art and issues]
Conventionally, as one method for compressing foundry sand filled in a mold forming space defined by a model plate and a casting frame, there is one in which the model plate and the compression means are brought close to each other. . However, this method requires a large hydraulic cylinder for raising and lowering the model plate, and as a result, the mold making machine has a high height, and it is necessary to provide a pit for installation. there were.
[0003]
The present invention has been made in view of the above circumstances, and its purpose is to mold a mold defined by a model plate and a frame member without providing a large hydraulic cylinder for lifting the model plate that requires a pit. It is an object of the present invention to provide a method and an apparatus capable of compressing a foundry sand in a space to a required hardness almost entirely.
[0004]
[Means for solving the problems]
In order to achieve the above object, the method for compressing foundry sand according to the invention of claim 1 includes a model plate fixed in a horizontal shape, and is mounted on the model plate so as to be slidable up and down so as to be movable up and down. Lower auxiliary frame,
A method of compressing foundry sand in a mold making space defined by a frame member disposed so as to be able to move up and down above the lower auxiliary frame, the step of throwing foundry sand into the mold making space, and at least A first compression step of compressing the molding sand of the mold making space from above the lower auxiliary frame under a state in which the lower auxiliary frame cannot be lowered; and a state in which the lower auxiliary frame and the frame member can be lowered. And a second compression step of further compressing the foundry sand in the mold making space by the compression means.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the frame member means a cast frame when the mold to be molded has a cast frame, and means a mold frame when there is no cast frame. The mold to be molded includes a case with a cast frame and a case without a cast frame extracted from the mold after the foundry sand is solidified in the mold. Furthermore, although the compression force by the compression means in the second compression step may be substantially the same as that in the first compression step, the effect of the present invention can be enhanced by increasing the compression force. Further, in the present invention, the compression means has various structures, the one that compresses the foundry sand is integrated, the one that is divided into a plurality of parts, and the flexibility that the pressure fluid acts on the back surface. Some have increased flexibility with a membrane. Various model plates can be used by mounting the model plate, the lower auxiliary frame, and the lower auxiliary frame lifting mechanism on the carry-in / out means.
[0006]
[Example 1]
An embodiment of a mold making machine to which the present invention is applied will be described in detail with reference to the drawings. The mold making machine includes a model plate 1 that is horizontally fixed, a lower auxiliary frame 2 that is mounted on the model plate 1 so as to be slidable up and down, and that can be moved up and down, and the lower auxiliary frame 2. A casting frame 3 as a frame member disposed above and below the casting frame 3, an upper auxiliary frame 4 disposed above and below the casting frame 3, and a raising and lowering arrangement above the casting frame 3. The lower part is composed of at least compression means 5 that can enter the upper auxiliary frame 4.
[0007]
And the said model board 1 is attached to the upper surface of the below-mentioned turntable 19, Furthermore, the vent plug (not shown) is embed | buried under the upper surface of the model board 1 depending on the shape of a model. The lower auxiliary frame 2 attached to the upper surface of a turntable 19 described later is moved up and down by a plurality of hydraulic cylinders 6 and 6 as a lower auxiliary frame lifting mechanism mounted on the turntable 19 described later. The casting frame 3 can be moved in the front-rear direction by a transport mechanism 9 that is pivotally supported by the frames 8, 8 at a suitable interval in the front-rear direction with a plurality of flanged rollers 7, 7. The transport mechanism 9 is attached to the lifting frame 10. The lifting frame 10 is installed between the upper ends of the piston rods of the two hydraulic cylinders 12 and 13 erected on the left and right sides of the table-like machine base 11, and is expanded and contracted by the hydraulic cylinders 12 and 13. It is designed to go up and down.
[0008]
The upper auxiliary frame 4 is installed between the lower ends of piston rods of downward hydraulic cylinders 14 and 14 mounted on the frames 8 and 8. The compression means 5 can run in the front-rear direction on the rails 20, 20 attached to the frames 8, 8 and extending in the front-rear direction via a plurality of flanged rollers 21, 21 supported on the side surfaces. And has a plurality of rectangular parallelepiped compression members 18 and 18 that can be raised and lowered. A casting sand weighing hopper 22 is mounted on the rails 20 and 20 so as to be able to travel in the front-rear direction. Further, the left hydraulic cylinder 12 of the two hydraulic cylinders 12 and 13 is mounted so that the center of the rotary table 19 serving as loading / unloading means extending in the left-right direction is intermittently horizontally rotated. is there.
[0009]
Next, a procedure for putting casting sand into a predetermined mold making space and compressing it will be described. First, under the state where the hydraulic cylinders 6 and 6 are extended and the lower auxiliary frame 2 is raised, the hydraulic cylinders 12 and 13 are contracted to the required length to lower the lifting frame 10 and onto the lower auxiliary frame 2. The casting frame 3 is placed, and then the hydraulic cylinders 14 and 14 are extended to overlap the upper auxiliary frame 4 on the casting frame 3 to define a mold making space.
[0010]
Next, a required amount of foundry sand is put into the mold making space from the weighing hopper 22, and then the weighing hopper 22 is unloaded and the compression means 5 is loaded directly above the upper auxiliary frame 4. Next, the lower auxiliary frame 2 cannot be lowered when the hydraulic cylinders 6 and 6 are contracted so that the oil cannot be discharged from the oil discharge side, and the oil can be discharged from the oil discharge side when the hydraulic cylinders 14 and 14 are contracted. The compression members 18 and 18 of the compression means 5 are lowered independently to compress the foundry sand, and the hydraulic cylinders 12 and 13 are contracted to operate the compression means 5 through the lifting frame 10 as appropriate. Lower the length. Thereby, the foundry sand in the mold making space is first compressed (see the figure).
[0011]
Next, when the hydraulic cylinders 6 and 6 are contracted, the lower auxiliary frame 2 can be lowered so that the oil can be discharged from the oil discharge side, and the hydraulic cylinders 12 and 13 are moved under the state in which the hydraulic cylinders 14 and 14 are extended. Further, the compression means 5, the casting frame 3, and the upper auxiliary frame 4 are further lowered by the contraction operation. Then, the lower auxiliary frame 2 is pushed down through the casting frame 3, the upper auxiliary frame 4, and the hydraulic cylinders 14 and 14, and the casting sand is lowered integrally with the casting frame 3 along with this, and the model plate 1 As a result, the foundry sand is further compressed. In this case, it is desirable that the lower surface (mating surface) of the foundry sand in the casting frame 4 substantially coincides with the lower surface level of the casting frame 4.
[0012]
After the compression of the foundry sand, the compression members 18 and 18 are raised, the hydraulic cylinders 12 and 13 are extended while the hydraulic cylinders 6 and 6 are extended, and the compression means 5, the upper auxiliary frame 4 and the like are raised, The cast frame 3 containing the molded mold is engaged with the rollers 7 and 7 with collars and lifted, and separated from the model plate 1. Thereafter, the turntable 19 is rotated 180 degrees horizontally to move another model plate 1 directly below the compression means 5, and the molding hopper 22 is replenished with foundry sand, and another empty casting frame is placed on the transport mechanism 9. Carry in 3 and finish one cycle.
[0013]
In the above-described embodiment, the molded mold is provided with the casting frame 3, but it may be without the frame extruded from the molding frame. In this case, in the first compression step, the compression members 18 and 18 can enter the upper auxiliary frame 4 and the mold to an arbitrary level, and the upper auxiliary frame 4 may be omitted.
[0014]
【The invention's effect】
As is apparent from the above description, the invention of claim 1 includes a model plate that is horizontally fixed, and a lower auxiliary frame that is mounted on the model plate so as to be slidable up and down and arranged to be movable up and down. ,
A frame member arranged to be movable up and down above the lower auxiliary frame;
A method of compressing foundry sand in a mold making space defined by the step of throwing the foundry sand into the mold making space; A first compression step of compressing the foundry sand from above by a compressing means, and further compressing the foundry sand in the mold making space by the compressing means under a state in which the lower auxiliary frame and the frame member can be lowered. A second compression step, so that almost all of the molding sand in the mold molding space defined by the model plate and the cast frame is provided without providing a large hydraulic cylinder for lifting the model plate that requires pits. Excellent practical effects such as being able to be reliably compressed to the required hardness.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a mold making machine to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Model board 2 Lower auxiliary frame 3 Cast frame 5 Compression means 19 Turntable

Claims (5)

A model plate that is horizontally fixed, and a lower auxiliary frame that is mounted on the model plate so as to be slidable up and down and arranged to be movable up and down;
A frame member arranged to be movable up and down above the lower auxiliary frame;
A method of compressing foundry sand in a mold making space defined by
Introducing casting sand into the mold making space;
A first compression step of compressing the foundry sand in the mold making space from above by a compression means under a state where at least the lower auxiliary frame cannot be lowered;
A second compression step of further compressing the foundry sand in the mold making space under the state in which the lower auxiliary frame and the frame member can be lowered;
A method for compressing foundry sand, comprising: In the molding sand compression method according to claim 1,
The method for compressing foundry sand, wherein a compressive force by the compressing means in the second compressing step is larger than that in the first compressing step. The method for compressing foundry sand according to claim 1 and 2,
A method for compressing foundry sand, characterized by compressing the foundry sand in the mold molding space by a plurality of compressing members that can descend independently of each other or a compressing means having a flexible film on which a pressure fluid acts on the back surface. . A device that compresses casting sand in a mold making space defined by a model plate, a frame member, and an auxiliary frame over two stages,
A horizontal and fixed model board;
A lower auxiliary frame that is mounted on the model plate so as to be slidable up and down and arranged to be movable up and down;
A lower auxiliary frame elevating mechanism for elevating and lowering the lower auxiliary frame;
A frame member disposed so as to be movable up and down above the lower auxiliary frame;
A compression means disposed so as to be movable up and down above the frame member and having a lower part capable of entering at least the frame member;
A foundry sand compression apparatus characterized by comprising: In the molding sand compression apparatus according to claim 4,
The molding sand compression apparatus, wherein the model plate, the lower auxiliary frame, and the lower auxiliary frame elevating mechanism can be moved into and out of the compression unit by a loading / unloading unit.

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