JP2002045949A - Molding device for mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable molding sand to fill into a high density state in a sand filling space, even when a pattern part on a pattern plate has a complicate shape without causing the so-called a bridging phenomenon, in a molding device for a mold provided with the pattern plate, a molding flask, an upper supplemental flask and a sand filling means. SOLUTION: This molding device for the mold is particularly provided with the sand filling means 12 provided with an aeration means 13 fluidizing the molding sand at the lower part and a suction means 9 for sucking to reduce the pressure in the sand filling space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mold making apparatus.

[0002]

2. Description of the Related Art Conventionally, as one of mold making apparatuses,
Some models include a model plate, a casting frame, a filling frame, and sand filling means for filling molding sand into a sand filling space defined by the model plate, the casting frame, and the filling frame. However, in the conventional molding apparatus having the above-described configuration, when the molding sand causes a so-called shelf hanging phenomenon in the sand filling means or when the shape of the model portion of the model plate is complicated, the molding sand is filled with the above-described sand. There was a problem that the filling state of the foundry sand was not good when it was blown into the space.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a so-called shelf hanging phenomenon in a mold making apparatus including a model plate, a casting frame, a filling frame, and sand filling means. It is an object of the present invention to provide a molding apparatus capable of filling a sand filling space in a high-density state even when a model portion of a model plate has a complicated shape, in addition to a case where the model portion has a complicated shape.

[0004]

In order to achieve the above object, a mold making apparatus according to the present invention comprises a model plate, a casting frame, a filling frame, the model plate, the casting frame, and the filling frame. Sand filling means for filling the defined sand filling space with molding sand, and a mold making apparatus comprising: a sand filling means provided with aeration means for fluidizing the molding sand at a lower portion,
It is characterized by comprising suction means for suctioning and reducing the pressure in the sand filling space.

[0005] With the above-described structure, the molding sand fluidized by the ejection of the compressed air from the aeration means is sucked into the sand filling space from the sand supply means while the pressure in the sand filling space is reduced by suction by the suction means. Fill. The blown molding sand is squeezed by conventional means.

[0006]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. A platen 3 to which a model plate 2 is attached is installed at the center of a platen-shaped machine base 1, and a lower frame which is mounted on the platen 3 so as to be vertically slidable. 4
However, it is mounted so as to be able to move up and down via upward cylinders 5 mounted on the surface plate 3. Further, a plurality of vent holes are provided on the upper surface of the model plate 2, and these vent holes are provided with a ventilation hole 6 formed in the surface plate 3 and a ventilation hole 7 formed in the machine base 1. And, it is connected to a vacuum pump 9 as a suction means via an on-off valve 8.

On the left and right sides of the machine base 1, actuators 10, 10 pointing in the vertical direction are mounted, and an elevating frame 11 is installed between the upper ends of the actuators 10, 10. A sand filling means 12 penetrates the elevating frame 11, and an aeration means 13 for ejecting compressed air to fluidize molding sand in the sand filling means 12 is mounted below the sand filling means 12. . An upper filling frame 15 is mounted below the sand filling means 12 via cylinders 14 attached to the sand filling means 12 so as to be able to move up and down. Has a plurality of squeeze feet 16 that can be moved up and down. The lifting frame 11 has a sand filling means 12.
And a roller conveyor 18 with a flange for carrying in and out the casting flask 17 is mounted.

Next, a procedure for forming a mold from the state shown in FIG. 1 will be described. First, the cylinders 5.5 are extended to raise the lower frame 4 and the cylinders 14 are extended to lower the upper frame 15, and then the actuators 10 are contracted to raise and lower the frame. 11 is lowered, whereby the casting frame 17 is placed on the lower casting frame 4, the upper casting frame 15 is placed on the casting flask 17, and the squeeze feet 16, 16 are moved up and down as appropriate to obtain a predetermined mold forming space. Is defined.

Next, the vacuum pump 9 sucks and decompresses the inside of the sand filling space, and the aeration means 13
The molding sand in the sand supply means 15 is pressurized by compressed air to fill the sand filling space while the molding sand in the lower part in the sand supply means 15 is fluidized, particularly while fluidizing the molding sand in the sand supply means 15. In addition, since the compressed air between the islands of the model portion in the model plate 2 can be reliably discharged by reducing the pressure in the sand filling space, the injected molding sand is filled in a high density state. be able to.

Next, after raising and lowering the squeeze feet 16 and the cylinders 14 and 14 are in a free state, the actuators 10 and 10 are further contracted to lower the lift frame 11 and the like to squeeze the filled molding sand. The upper surface of the foundry sand in the flask 17 is made substantially the same level as the upper surface of the flask 17. Next, after the cylinders 5.5 are in a free state, the actuators 10 are further contracted to lower the elevating frame 11 and the like, and the molding sand is further squeezed. Thereafter, the actuators 10 are extended to release the mold, and the entire process is completed.

[0011]

As is apparent from the above description, the present invention relates to a model plate, a casting frame, a filling frame, and a sand filling space defined by the model plate, the casting frame, and the filling frame. A sand filling means for filling molding sand, wherein the sand filling means includes an aeration means for fluidizing the molding sand at a lower portion, and a suction means for sucking and depressurizing the inside of the sand filling space. , So that the so-called shelf hanging phenomenon does not occur, and even when the shape of the model part of the model plate is complicated, it is possible to reliably fill the sand filling space with the molding sand in a high density state. It has excellent practical effects such as being able to.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

[Explanation of symbols]

 9 vacuum pump 12 sand filling means 13 aeration means

Claims (1)

[Claims] 1. A model plate, a casting frame, a filling frame, and the model plate
A sand filling means for filling molding sand into a sand filling space defined by the casting frame and the filling frame, and a sand molding means, wherein the sand filling means has an aeration means for fluidizing the molding sand at a lower portion. And a suction means for suctioning and reducing the pressure in the sand filling space.