JPS582519Y2 - model board device - Google Patents

Description

[Detailed description of the invention] This invention is based on the method of placing molding sand into the space formed by the molding flask and the model plate, and then blowing compressed air onto the surface of the molding sand and passing it through the molding sand to form a model. The present invention relates to a model plate device used in a method of molding molds by increasing the packing density of foundry sand by discharging it from the plate.

The model plate device used in the above-mentioned mold making method requires a ventilation mechanism, and conventionally, this ventilation mechanism generally involves penetrating a large number of small holes in the model plate and closing the upper end of the small hole on the surface side of the model plate. It is constructed by fitting a vent plug into the section.

However, the slits in commonly used vent plugs are relatively wide, so when the molding sand is hardened by the flow of compressed air, fine molding sand particles also pass through the slits and are discharged to the outside together with the compressed air. and as a result,
Inconvenient phenomena have occurred, such as the surface of the formed mold becoming rough and the vent plug leaving marks on the surface of the mold.

Further, there is a problem in that the vent plug requires skill to fit into the boundary between the model plate and the model part, and cannot be easily done.

The present invention has been made in view of the above circumstances, and one embodiment of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 designates a box-shaped model board with an opening 2 at the top, and a suitable number of through holes 4.4 are bored in the bottom wall 3 of this model board.

On the bottom wall 3 of the model board stand 1, the top surface is flat and the outer dimensions are slightly smaller than the dimensions of the opening 2, and there are protrusions at appropriate locations on the sides to prevent the movement of the model board 8, which will be described later. A model board 8 is made up of a horizontal board part 6 provided with an angle of 5°5 and a rib 7.7 integrally formed at the lower part of the horizontal board part 6, with the upper surface level being the same as that of the model board stand 1, and horizontally. Plate part 6
The protrusions 5, 5 of are fitted into the opening 2,
Slit-shaped gaps 9, 9 are formed outside the outer periphery of the horizontal plate part 6, and the space formed by the model board stand 1 and the horizontal plate part 6 is formed by ribs 1, 7 to form through holes 4, 4. It is divided into a plurality of chambers 10, 10, which respectively communicate with each other.

Furthermore, an opening 12 is formed at a predetermined location on the horizontal plate part 6, as shown in FIG. Inside the opening 12 is a rectangular model part 13.
is installed on the bottom wall 3 and fitted, and a slit-shaped gap 14 is formed between the outer surface of the model part 13 and the side surface of the opening 12.
is formed.

The gap 14 thus communicates with the chambers 10, 10 and the upper part of the model plate 8 communicates with the chamber 10.10 through the gaps 14, 14.

Furthermore, an opening 15 is bored through the chamber 10 at a predetermined location in the horizontal plate part 6, and a protrusion on the bottom is formed in the shape of a truncated cone and is located directly above the opening 15 in the horizontal plate part 6. 16
．． A gap 18 is formed between the model part 17 and the horizontal plate part 6 by the projections 16, 16, and a gap 18 is formed between the model part 17 and the horizontal plate part 6. The vicinity of the joint with the chambers 10 and 10 is communicated with a gap 18.

19 is a rectangular frame-shaped casting placed on the model board 1.

With this structure, molding sand (not shown) for green molding is poured into the space 20 formed by the model board 1, the model board 8, the casting flask 19, etc., and then the casting When compressed air is blown onto the surface of the sand, the compressed air blows into the molding sand, the gaps 9, 14, 16, the opening 15, the chambers io, io, the through holes 4,
4 in order and is discharged into the atmosphere.

As a result of the compressed air passing away the foundry sand in the flask 19, the foundry sand is moved toward the gaps 9, 14, and 16, its packing density is increased, and it is hardened.

Next, by conventional means (not shown), the molding sand in the flask 19 is compressed from both the upper and lower directions to obtain a desired hardness, thereby forming a mold.

Thereafter, by performing a predetermined process, placing another empty flask on the model plate stand 1, and repeating the above-described operations, molds can be continuously formed.

Since the present invention is constructed as described above, it is possible to reduce the slit-shaped gap formed between the opening of the model plate and the model part. The air that has passed through the molding sand in the frame does not contain fine molding sand and is discharged from the model plate, causing the surface of the formed mold to become rough or leave vent plug marks on the surface of the mold. There is no problem at all, and it is possible to ensure the removal of air at the boundary between the model plate and the model part, where pin square molding of the mold is required, making it possible to mold molds with accurate dimensional accuracy, which has a practical effect. have

[Brief explanation of the drawing]

The opening shows one embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a plan view. 6... Model board, 8... Model part, 12... Opening, 1
3... Model part, 14... Gap, 15... Ventilation hole,
1γ...Model part, 18...Gap.

Claims (1)

[Scope of utility model registration request] After pouring molding sand into the space formed by the molding flask and the model plate, compressed air is blown onto the surface of the molding sand, passed through the molding sand, and discharged from the model plate, thereby filling the molding sand. In a model plate device used in a mold making method for producing a mold with increased density, an opening 12 or 15 is provided at a predetermined position of a model plate 8 and extends vertically through the opening 12 or 15. A slit-like gap 14 between
or 18, and is provided with a model section 13 or 17.