JP2001259798A - Method for filling granular filling material in mold for casting and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fill granular filling material into a space formed of a flaskless mold and a holding flask with uniform filling density without raising the dust. SOLUTION: In a filling method for granular filling material in the mold for casting performing the pouring of molten metal after filling the granular filling material into the space between the mold and the holding flask by disposing the holding flask at the surroundings of the flaskless mold, a sucking cover is closely disposed at the top part of the holding flask laid on a molding board, and after press-fixing a press-fitting plate provided with plural sucking hole and plural filling nozzles to the top part of the mold, the pressure in the space formed with the mold closed with the sucking cover and the press-fitting plate and the holding flask, is reduced by using a vacuum source communicated from the sucking holes and the granular filling material is sucked and filled when the space becomes the decompression state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for filling a granular filler for holding a casting mold when pouring a casting mold.

[0002]

2. Description of the Related Art A frameless molding method for molding a casting mold without using a casting frame is conventionally known. When a mold is formed by such a method, it is difficult to prevent an action (tension) that the mold tends to expand due to the pressure acting on the molten metal mold after pouring by the casting frame. Initially, in order to prevent a decrease in dimensional accuracy of the casting and an increase in weight, the size of the casting mold is made larger than when using a casting flask, or the same holding frame as the casting mold is attached to the casting mold before pouring. In such a way, the tension was prevented. However, the method of enlarging the mold size has a problem that the weight ratio of the mold to the metal, that is, the so-called sand metal ratio increases, which leads to an increase in the cost of the casting. Also,
In the method using a holding frame having the same size as the mold, it is necessary to prepare a holding frame corresponding to the change in the size of the mold, and there is a problem that the advantage of adopting a mold without a frame is lost.

For this reason, a holding frame having a size larger than the mold is prepared, and a space formed by the mold and the holding frame placed on the surface plate is filled with a granular filler such as dry mold sand.
A method has been developed to prevent tension without increasing the sand metal ratio or preparing a holding frame in accordance with the size of the mold in a frameless mold making method. This method is known, for example, from JP-B-63-11097.

In these methods, generally, the charging of the granular filler often depends on gravity drop. For this reason, the packing density of the granular packing tends to be highest near the platen corresponding to the bottom of the mold, and tends to gradually decrease toward the top of the mold. In this case, there is a problem that the effect of preventing tension is not obtained in the mold in which the product part is formed in the central part and the upper part. Further, since the charging of the granular filler is performed in a state where the space is opened, there is a problem that dust is remarkably generated during the charging operation and the working environment is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of a case where a granular filler is filled in a space formed by a mold and a holding frame placed on a surface plate. It is an object of the present invention to provide a method and apparatus for filling a granular filler, wherein the packing density of the filler is uniform and dust generation during operation is prevented.

[0006]

In order to achieve the above object, a method for filling a granular filler according to claim 1 of the present invention comprises the steps of:
A method for filling a granular filling in a casting mold, in which a holding frame is disposed around a mold without a frame, and a filling is performed after filling the granular filling between the mold and the holding frame, wherein the casting mold top portion and the The method includes a step of sealing the top of the holding frame by a closing means to define a closed space, and a step of filling the closed space with the granular filler by depressurization.

Here, the closing means in claim 1 is provided with, for example, a suction lid closely attached to the top of the holding frame placed on the surface plate, a suction hole and a filling nozzle, and the top of the mold inside the suction lid. And a crimping plate capable of moving and crimping.

According to a second aspect of the present invention, there is provided a method for filling a granular filler, comprising: placing a holding frame around a frameless mold; filling the granular filler between the mold and the holding frame; This is a method for filling a granular filler in a mold, in which a suction lid is placed in close contact with the top of a holding frame placed on a surface plate, and a pressure plate having a plurality of suction holes and a plurality of filling nozzles is pressed against the top of the mold. After that, using a vacuum source communicating from the suction hole, the space formed by the mold and the holding frame closed by the suction lid and the pressure plate is depressurized, and when the space is in a depressurized state, the granular filler is suction-filled. To do.

In a third aspect of the present invention, there is provided a method for filling granular fillers, comprising: placing a holding frame around a frameless mold; filling the granular filler between the mold and the holding frame; This is a method for filling a granular filler in a mold, in which a suction lid is placed in close contact with the top of a holding frame placed on a surface plate, and a pressure plate having a plurality of suction holes and a plurality of filling nozzles is pressed against the top of the mold. After that, the granular filler is charged into the space formed by the mold and the holding frame closed by the suction lid and the pressure plate through the filling nozzle, and then the space is depressurized using a vacuum source communicating from the suction hole to reduce the granularity. The filling is performed by suction filling.

[0010] According to a fourth aspect of the present invention, there is provided a granular filler filling apparatus, comprising: a platen on which a frameless mold is placed; a holding frame having a size larger than the size of the mold placed on the platen; A suction lid having the same dimensions as the above, and arranged inside the suction lid,
It has a size larger than the mold, is provided with a plurality of suction holes and a plurality of filling nozzles and is capable of moving up and down, a granular filling hopper, a granular filling cutout gate, and a hopper lid. And

Here, the frameless mold used in the present invention is:
There is no particular limitation on the molding process, such as a green mold, a shell mold, a self-hardening mold, and a gas curing mold, as long as the mold is formed by adding a binder to the mold sand. As the granular filler, if it is a dry one, silica sand, mullite sand, zircon sand, and the like provided as mold sand can be used as they are, but generally the same aggregate as the mold is used. This eliminates the need to separate the mold sand and the granular filler in the sand recovery system, and facilitates sand management.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing the configuration of the present invention. FIGS. 2 to 5 are process diagrams showing the steps of the embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a state in which the platen on which the mold is placed is arranged below the granular filler filling device, and FIG. 3 shows the granular filler filling device in close contact with the holding frame. FIG. 4 is a schematic cross-sectional view showing the state, FIG. 4 is a schematic cross-sectional view showing a state in which the granular filler is being sucked, and FIG. 5 is a state in which all the steps have been completed and the granular filler filling apparatus has been moved above the mold. FIG.

In FIG. 1, a granular filler filling apparatus comprises a suction lid 3, a pressure plate 4, filling nozzles 5, 5, suction holes 6,
6, 6, 6, an actuator 7 for vertically moving the pressure plate,
It comprises a suction connection port 8, a granular filler hopper 9, a granular filler cut-out gate 10, and a hopper lid 11. The granular filler filling device composed of these parts can move up and down by using an actuator not shown. The space between the suction hole 6 and the suction connection port 8 functions as a suction chamber, and the suction connection port 8 is connected to a vacuum source (not shown).

Next, steps of the embodiment of the present invention will be described with reference to FIGS.

First, FIG. 2 shows a state in which the platen 1 on which the mold M and the holding frame 2 are placed is arranged below the granular filler filling apparatus. The platen 1 is disposed below the granular filler filling device using a moving means (not shown), for example, a driving roller conveyor, a pusher, a cushion cylinder, or the like. In this state, a required amount of the granular filler S is stored in advance in the granular filler hopper 9 by using a known filler supplying means (not shown) capable of performing a fixed amount cutout.

Next, as shown in FIG. 3, the granular filler filling device descends so that the suction lid 3 is in close contact with the top of the holding frame 2, and then the pressure plate 4 is moved by the action of the actuator 7 to the top of the mold M. Descend to crimp. When the crimping of the top of the mold M by the crimping plate 4 is completed,
The space C formed between the mold M and the holding frame 2 is depressurized.

When the decompression of the space C is completed, as shown in FIG. 4, the gate 10 for cutting out the granular material is opened, and the granular material S stored in the granular material hopper 9 is suction-filled toward the space C. Is done.

When the suction filling is completed, as shown in FIG. 5, after the pressing of the mold M by the pressing plate 4 is released, the granular filler filling apparatus moves upward, and all the steps are completed.
After the end of the process, the platen 1 is again carried out to the next process by a moving means (not shown).

In the above description, the method of raising and lowering the granular filling device without raising and lowering the platen to bring the holding frame 2 and the suction lid 3 into close contact with each other has been described. Even if the platen 1 is raised and lowered instead of raising and lowering the filling device, the effect obtained at all remains unchanged.

Further, the vacuum source may be of any type, such as a blower or a vacuum pump, having an ultimate pressure and an exhaust air volume sufficient to reduce the pressure in the space C, depending on the volume of the space C. Further, the suction connection port 8 and the vacuum source may be directly communicated with each other, or a receiver tank equipped with a valve is arranged between the suction connection port 8 and the vacuum source, and the pressure in the receiver tank is always reduced by using the vacuum source. Alternatively, the pressure in the space C may be reduced by opening and closing a valve provided in the receiver tank.

Although the height of the holding frame 2 and the mold M has been described as being the same in FIGS. 1 to 5, the relationship between the height of the holding frame 2 and the mold M is not limited to this. No matter how the height relationship between the holding frame 2 and the mold M changes, the crimping plate 4 can crimp the top of the mold M while the suction lid 3 is placed in close contact with the top of the holding frame 2. If the stroke of the actuator 7 is set, the present invention can be applied no matter how the height of the holding frame 2 or the mold M changes.

Further, an elastic body such as a foamed sponge may be provided on the crimping surface for protecting the mold on the crimping plate.

[0023]

As is apparent from the above description, according to the present invention, casting is performed by disposing a holding frame around a frameless mold, filling a granular filler between the mold and the holding frame, and then pouring. A method for filling a granular filler in a casting mold, wherein a step of sealing the top of the mold and the top of the holding frame by a closing means to define a closed space, and a step of filling the closed space with the granular filler by decompression. Since the filling density of the granular filler filled in the space formed by the casting mold and the holding frame is uniform, and the filling of the granular filler is performed in a state where the space is closed, since The working environment is improved without problems such as dust.

According to the second aspect of the present invention, after the suction lid is placed in close contact with the top of the holding frame placed on the surface plate, a pressure plate having a plurality of suction holes and a plurality of filling nozzles is pressed against the top of the mold. Using a vacuum source communicating from the suction hole, the space formed by the mold and the holding frame closed by the suction lid and the pressure plate is depressurized, and when the space is in a depressurized state, the granular filler is suction-filled. Therefore, there is also an effect that the suction filling time is short.

Further, in claim 3, a suction lid is closely attached to the top of the holding frame placed on the surface plate, and a pressure plate having a plurality of suction holes and a plurality of filling nozzles is pressed against the top of the mold. Then, the granular filler is put into the space formed by the mold and the holding frame closed by the suction lid and the pressure plate through the filling nozzle, and thereafter, the space is depressurized by using a vacuum source communicating from the suction hole to perform the granular filling. Since the material is suction-filled, there is also an effect that the filling can be further improved.

According to a fourth aspect of the present invention, the method comprises the steps of: placing a holding frame around a frameless mold; filling the space between the mold and the holding frame with the granular filler; An apparatus, comprising: a platen on which a mold without a frame is placed; a holding frame having a size larger than the size of the mold placed on the platen; a suction lid having the same size as the holding frame; It is arranged inside the lid, has a size larger than the mold, is provided with a plurality of suction holes and a plurality of filling nozzles, is capable of moving up and down, a pressurized plate, a granular filler hopper, a granular filler cutout gate, and a hopper lid. Since it is a granular filler filling apparatus in a casting mold, the filling density of the granular filler filled in the space formed by the mold and the holding frame becomes uniform, and furthermore, the filling of the granular filler is Dust generated because the space is closed The improvement of any problem without work environment can be achieved in a simple manner. As described above, the effect of the present invention on the casting industry is enormous.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a configuration of a granular filler filling apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a state in which a platen on which a mold and a holding frame are placed is arranged below a granular filler filling apparatus in the steps in the embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing a state in which the holding frame and the top of the mold are pressure-bonded by the granular filler filling apparatus, and the space formed by the holding frame and the mold is depressurized in the steps in the embodiment of the present invention. is there.

FIG. 4 is a schematic cross-sectional view showing a state in which the granular filler cutout hopper is opened and the granular filler is suction-filled into a space in the steps in the embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing a state in which suction filling is completed in the steps of the embodiment of the present invention and pressure holding of the holding frame and the top of the mold by the granular filling device is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface plate 2 Holding frame 3 Suction lid 4 Crimping plate 5 Filling nozzle 6 Suction hole 7 Actuator 8 Suction connection port 9 Granular material cutout gate 10 Granular material hopper 11 Hopper lid C space M Mold S Granular material

Claims (4)

[Claims] 1. A method for filling a granular filler in a casting mold, wherein a holding frame is arranged around a mold without a frame, and a granular filler is filled between the mold and the holding frame and then poured. A casting mold, comprising: a step of sealing the top of the mold and the top of the holding frame with a closing means to define a closed space; and a step of filling the closed space with a granular filler by reducing pressure. The method for filling granular fillers in the above. 2. A method for filling a granular filler in a casting mold, comprising disposing a holding frame around a mold without a frame, filling the space between the mold and the holding frame with the granular filler, and then pouring the molten metal. A suction lid is placed in close contact with the top of the holding frame placed on the surface plate, and a pressure plate having a plurality of suction holes and a plurality of filling nozzles is pressed against the top of the mold, and then a vacuum source communicating from the suction holes is used. The space formed by the mold and the holding frame closed by the suction lid and the pressure plate is depressurized, and when the space is in a depressurized state, the granular filler is suction-filled,
A method for filling a granular filler in a casting mold. 3. A method for filling a granular filler in a casting mold in which a holding frame is disposed around a mold without a frame, and a granular filler is filled between the mold and the holding frame and then poured. A suction lid is placed in close contact with the top of the holding frame placed on the surface plate, and a pressure plate having a plurality of suction holes and a plurality of filling nozzles is pressed against the top of the mold, and then the granular filler is suctioned through the filling nozzle. And into the space formed by the mold and the holding frame closed by the crimping plate, and thereafter, the space is decompressed using a vacuum source communicating from the suction hole, and the granular filler is suction-filled. And a method for filling granular fillers in casting molds. 4. A granular filler filling apparatus in a casting mold for disposing a holding frame around a mold without a frame, filling the space between the mold and the holding frame with the granular filler, and then pouring the molten material. A platen on which a mold without a frame is placed, a holding frame having a dimension larger than the size of the mold placed on the platen, a suction lid having the same size as the holding frame, and a suction lid disposed inside the suction lid. Has a larger size than the mold, is provided with a plurality of suction holes and a plurality of filling nozzles, and has a vertically movable crimping plate, a granular filler hopper, a granular filler cutout gate, and a hopper lid, Filling device for granular packing in casting mold.