JP2606167Y2 - Air vent device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air vent device for smoothly removing air from a mold, and more particularly to an air vent device for smoothly removing air from a mold for forming a core.

[0002]

2. Description of the Related Art When molding a core, particularly when molding a core having a convex portion such as a boss, molding is performed using an upper main mold, a lower main mold, a vise, and an insert. That is, the nest held by the nesting vise cylinder is disposed between the upper main mold, the lower main mold, and the vise, and compressed into a molding space formed by the upper main mold, the lower main mold, the vise, and the nest. The sand is filled together with the air, and the core is formed.

Here, when the molding space is filled with sand to form the core, especially when a convex portion is formed,
It is necessary to smoothly remove air filled with sand from the mold. In other words, if air remains in the molding space, there is a risk that the sand clogging will worsen and the core shape cannot be formed.For example, an air vent device for smoothly removing air is provided at the bottom of the recessed portion of the nest. Is provided.

[0004]

Here, cores include a shell core, a cold box core, and the like. Regarding any core, when sand is filled, resin such as resin is added to the sand. Since the adhesive contains the adhesive, when the air passes through the air vent device, the adhesive or the like adheres to a passage constituting the air vent device, sand adheres to the passage, and the air vent device may be clogged. is there.

If the air vent device is clogged, the air filled together with the sand cannot be removed smoothly from the mold.
The air remains in the molding space, and for example, the so-called sand clogging, in which the bottom of the concave portion of the nest is not filled with sand, occurs, and the core shape is lost, and there is a concern that the quality may deteriorate. For this reason, it is necessary to frequently perform the cleaning work of the air vent device. For this reason, it is necessary to secure the working personnel, and it is not possible to reduce the manufacturing cost.
Further, since the air vent device cannot be completely removed only by air blowing, the cleaning operation has to be performed using a brush or the like, and the performance of the cleaning operation may hinder improvement in productivity.

The present invention has been made in view of the above circumstances, and it is possible to smoothly remove air in a mold for forming a core by cleaning a passage forming an air vent device with a rod-shaped member. It is an object to provide a possible air vent device.

[0007]

[SUMMARY OF To this end, the present invention is sand
To form the core and to release the internal air to the outside.
A mold with a passage for removal and a
A rod-shaped member that fits with a fixed gap
Moving means for moving the recording die in one direction.
A vent device being, the passage of the mold transfer
The rod-shaped member is opened along the movement direction,
Part is fixed to the outside of the mold.
Into the core molding surface, and when the mold moves,
The end protrudes inward from the core molding surface
You .

[0008]

When the sand is filled into the molding space inside the mold to mold the core, air is filled together with the sand. Is provided to the outside, and the air is removed to the outside through the passage. At this time,
In the road, the tip of the rod-shaped member fitted with a predetermined gap
Even if it is deep, it is inserted into the core molding surface, so core molding
There is no trace of the rod-shaped member on the surface , and by making the gap smaller than the particle size of the sand, it is possible to exclude only air to the outside through the passage without removing sand particles to the outside. Becomes

After the core is formed, the mold is moved in one direction.
While the tip of the rod-shaped member moves from the core molding surface.
Since it protrudes inside, it is possible to remove sand particles and the like adhered to the gap at the time of penetration, and it is possible to prevent the passage from being blocked. Also, as the mold moves,
The tip of the material protrudes inside from the core molding surface
Therefore, even if some sand particles adhere to the passage, the mold
As long as it moves, the tip of the rod
Protruding, maintenance-free and adheres to passages for a long time
Sand particles and the like are removed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a part of a shell machine 10 for molding a shell core having a boss-shaped convex portion. Modeling is performed using 21 and the nest 41 on the left side.

In the following description, the right nest 21
And only the left nest 41 will be omitted. That is, the right nest cylinder 22 (moving means) holds the right nest between the upper main mold 11 and the lower main mold 12.
21 and the nest 41 on the left side are arranged, and the upper main mold 11 and the lower main mold 12
In the molding space 1 formed by the right nest 21 and the left nest 41, sand (with a particle size of about 0.
3mm to 0.4mm) is filled and the core is formed.

The right nesting vise cylinder 22 and the right nesting 21 are connected via a bracket 23. The right nesting 21 extends between the upper main mold 11 and the lower main mold 12. It can move rightward from the position shown in FIG. Furthermore, as a configuration according to the present invention, a nest that comes into contact with the bottom of the protrusion of the core is provided.
An air passage 25 is provided in the bottom 24 of the concave portion 2 of 21. In the air passage 25, a rod-shaped member 26 having an end 27 fixed to a fixed base 28 is provided. here,
An air vent device is configured by the air passage 25 and the rod-shaped member 26.

When the sand is filled as shown in FIG. 1 and FIG. 2, the rod-shaped member 26 is positioned at a position where the tip 27 is slightly offset from the bottom 24 of the insert 21 (offset amount). 29), and in this embodiment, the air passage 25 is composed of a small-diameter portion 33 and a large-diameter portion 34, and the gap between the rod-shaped member 26 and the small-diameter portion 33 is formed. 30 is a gap that does not allow sand to escape.

After the core is formed by filling with sand, the right insert 21 is moved rightward in FIG. 1 by the right insert vise cylinder 22. At this time, the rod-like member 26 is fixed to the fixed base. Since it is fixed to 28, the rod-shaped member 26 and the air passage 25 have the positional relationship shown in FIG. That is, the tip
The rod-shaped member 26 penetrates the air passage 25 so that the protrusion 27 is located at a position protruding inward from the bottom 24 of the insert 21.

Next, the operation of the embodiment will be described. In order to form the shell core, the molding space 1 has a particle size of approximately 0.3 mm
When 0.4 mm of sand is filled from the filling port 13, air is filled together with the sand.In the air vent device according to the present embodiment, an air passage 25 is provided at the bottom 24 of the nest 21. In this configuration, the air filled in the molding space 1 is excluded to the outside. When filling sand further,
The leading end 27 is formed at the bottom of the nest 21 so that the gap 30 between the rod-shaped member 26 and the small diameter portion 33 is a gap that does not allow sand to escape.
It is fitted to a position slightly offset to the outside from 24, so that air is discharged to the outside through the gap 30, but almost no sand is discharged.

At this time, since the tip portion 27 is offset from the bottom portion 24 to the outside, there is no trace of the rod member 26 on the molding surface of the core when sand is filled. And
After the core is formed by filling the sand, the tip portion 27 of the rod-shaped member 26 is inserted into the nest 21 by the action of the nesting vise cylinder 22 on the right side.
The rod-shaped member 26 penetrates the air passage 25 until the rod-shaped member 26 reaches a position protruding inward from the bottom portion 24, so that the particle size is substantially reduced.
Even if the sand smaller than 0.3 mm adheres to the gap 30 between the rod-shaped member 26 and the small-diameter portion 33 and the gap between the tip portion 27 and the small-diameter portion 33 when the sand is filled, the gap 30 is clogged. It becomes possible to remove sand particles and the like adhered when the rod-shaped member 26 penetrates the gap 30, and it is possible to prevent the air passage 25 from being blocked.

In this embodiment, the movement of the right nest 21 and the left nest 41 by the nesting vise cylinders 22 and 42 after the molding of the core is used to form the air passages 25 and 45.
It closed since so as to prevent the, not in the particularly complex structure, rather it leads to increase in manufacturing cost, or <br/>, nor interfere with the productivity for the implementation of the cleaning .

Further, after the core is formed, the inserts 21 and 41 are formed.
Each time the core is moved to take out the core, the air passage 25 and
Since the cleaning operation of the air vent device is performed so as to prevent the blockage of 45, the blockage is reliably prevented. here
With the movement of the nests 21 and 41, the tip of the rod-shaped member 26 is
Because it is configured to protrude inside from the submodeling surface, the air passage
Even if some sand particles adhere to 25, nests 21 and 41 are transferred.
As long as it moves, the tip of the rod-shaped member 26 is
And maintenance-free air passage for a long time
Sand particles and the like attached to 26 can be removed.

[0019]

[Effects of the Invention] As described above, the present invention provides core molding.
Later, with the movement of the mold, the tip of the rod-shaped member
Since it protrudes further inside, it is possible to remove sand particles etc. attached to the passage without hindering improvement in productivity,
This has the effect of preventing the passage from being blocked. Also, some sand particles are attached to the passage.
As long as the mold moves, the tip of the rod
Protruding from the inside of the
Lee can be realized.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of an essential part for explaining the operation of the embodiment.

FIG. 3 is a sectional view of an essential part for explaining the operation of the embodiment .

[Description of Signs ] 1 Modeling space 11 Upper main mold 12 Lower main mold 21 Right insert 22 Right insert vise cylinder 25 Air passage 26 Bar-shaped member 30 Gap 41 Left insert 42 Left insert vise cylinder 45 Air aisle

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22C 15/24

Claims (1)

(57) [Scope of request for utility model registration] (1) A core is formed by filling with sand.
Mold with a passage for removing air from outside
And a rod-shaped member fitted in the passage with a predetermined gap
Moving means for moving the mold in one direction after core molding
And a step , wherein the passage is opened along a moving direction of the mold,
The rod-shaped member has a base end fixed to the outside of the mold and is filled with sand.
Sometimes, even if the tip is deep,
When the mold moves, the tip protrudes inward from the core molding surface.
Air vent device, characterized in that the output.