JP3348321B2 - Vibration method of the vibrating device for casting sand filling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vanishing model casting or a molding of a self-hardening mold.
The present invention relates to a method for vibrating a molding sand filling vibrating apparatus capable of securing a sufficient sand filling density in these holes even when axial holes are formed.

[0002]

2. Description of the Related Art The vanishing model casting method can be said to be an excellent casting method having many advantages as compared with the conventional casting method. However, in order to obtain a high-quality casting, the vanishing model made of the foam molded product installed in the casting flask is not deformed, and the hollow part of the vanishing model is filled with molding sand and lost during casting of the molten metal. It is required that the molding sand be filled with the air permeability enough to allow the generated gas to escape sufficiently without causing the wall of the model to move.

For this reason, conventionally, a molding flask is placed and fixed on a vibration table, and the molding table is filled with the molding sand by vibrating the vibration table and the molding flask. That is, as shown in FIGS. A table 3 is disposed on a machine base 1 via springs 2 and 2 so as to be able to swing horizontally and freely, and two vibration motors 4 and 4 having a horizontal axis parallel to the Y axis are mounted on a lower surface of the table 3. By rotating the vibration motors 4 and 4 in opposite directions to vibrate the table 3 and the casting flask 5 mounted and fixed on the table 3 in the Z-axis direction, the periphery of the disappearing model 6 is filled with molding sand 7. Vibration device configured as described above. Alternatively, as shown in FIGS. 5 and 6, two vibration motors 8, 8 having a vertical axis parallel to the Z-axis are additionally fixed to both sides of the table 3 in addition to the vibration device. The molding sand 7 is filled around the vanishing model 6 by rotating the table 3 and the casting flask 5 in two directions of the Z-axis direction and the X-axis direction by rotating the tables 8 and 8 in opposite directions. A vibrating device or the like is used.

However, in the conventional vibrating apparatus, if holes are formed in the vanishing model 6 in the horizontal uniaxial direction or the horizontal biaxial direction, it is possible to secure a sufficient sand filling density in these holes. It has disadvantages that cannot be achieved. This was confirmed by the following experiment by the present inventors.
The filling experiment was performed using the experimental device shown in FIG. That is, the experimental device has a side length W of 300 m.
A test piece 9 is placed inside a casting flask 5 having a height m of 400 mm and a casting sand 7 around the test piece 9. The test piece 9 is made of a transparent acrylic resin, and has a main tube portion 9A having a uniform inner diameter (d1 = 25 mmφ) and a main tube portion 9A.
Has a uniform axis (d2 = 15 mmφ) and length (L) having an axis C2 perpendicular to the axis C1
= 90 mm), the axis C1 of the main pipe 9A is vertically oriented, and the branch pipe 9
The axis C2 of B is moved from the top surface 7A of the molding sand 7 to a predetermined depth (D
= 225 mm), and the upper end of the main pipe portion 9A is projected from the top surface 7A of the molding sand 7. Such an experimental device is mounted and fixed on the table 3 of the first conventional example using the conventional standard type vibration device as shown in FIGS. 3 and 4, and the measurement results when the vibration time is set to 30 seconds are shown in Table 1. Shown in
The same experimental device is mounted and fixed on the table 3 of the second conventional example by a vibration device in which two vibration motors 8 and 8 are additionally fixed to the first conventional example as shown in FIGS. Table 2 shows the measurement results when fixed at 30 seconds.

[0005]

[0006]

In the conventional vibration device corresponding to Table 1, it was confirmed that there was no inflow of the molding sand 7 in the X-axis direction. This means that when the vanishing model 6 has a hole in the X-axis direction,
This indicates that it is not possible to ensure a sufficient sand filling density in this hole. Further, it is shown that even with the conventional vibration device corresponding to Table 2, it is impossible to expect the inflow amount of sand in the X-axis direction.

[0008]

The problem to be solved by the present invention is that when a hole in the X-axis direction is formed in the vanishing model, the state of inflow of sand into the hole is poor, and the hole cannot be sufficiently filled. The point is that it is not possible to secure a sufficient filling density of molding sand.

[0009]

According to the present invention, there is provided a molding sand filling table having a casting frame removably fixed on an upper surface thereof, which is swingably disposed on a machine base via a spring, and a lower portion of the table. Or, in a vibration device which is provided with two vibration motors which are attached to have a parallel horizontal axis and which protrude to the side and which rotate in the same direction, two vibration motors which rotate in the same direction are used. It is characterized by rotating continuously and then rotating continuously for a certain period of time. Even if the vanishing model has a hole in the X-axis direction, the purpose is to ensure a sufficient filling density of molding sand in the hole and the casting. The objective of ensuring a relatively uniform filling density of molding sand at each position in the frame has been achieved.

[0010]

According to the present invention, two vibrating motors attached to the bottom or side of the table are rotated forward and backward in the same direction, so that the table can be moved vertically and horizontally. (For example, in the X-axis direction) simultaneously vibrates in two directions, and even if the vanishing model has a hole in the X-axis direction,
In this hole, a sufficient filling density of the molding sand can be ensured, and a relatively uniform filling density of the molding sand can be ensured at each position in the casting flask.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the present invention, and FIG. 2 is a plan view of FIG. Note that the same or corresponding parts as those of the conventional example are denoted by the same reference numerals and described. 1 and 2, a table 3 is horizontally and swingably disposed on a machine base 1 via springs 2 and 2, and a lower or side surface of the table 3 has a horizontal axis parallel to the Y axis. The molding frame 5 fixed with the vibration motors 4, 4 or 4 ′, 4 ′ mounted on the table and placed and fixed on the table 3 is filled with molding sand 7 and disappears in the molding sand 7. Is installed. In such a configuration, vibration motors 4, 4 or 4 'appropriately selected,
When the 4 'is continuously rotated in the same direction for a predetermined period of time and then rotated in the reverse direction, the table 3 and the flask 5 mounted and fixed on the table 3 are rotated in two directions, a vertical direction (Z axis) and a horizontal direction (X axis). Vibrates in the same direction.

As “Comparative Experimental Example 1”, the experimental apparatus shown in FIG. 7 is mounted and fixed on the table 3 shown in FIGS. 1 and 2, and the rotational directions of the vibration motors 4, 4 or 4 ′, 4 ′ are fixed. Table 3 shows the measurement results when the vibration time was limited to 30 seconds only in the direction.

[0013]

In Table 3, compared with the measurement result of the first conventional example (Table 1), when the sand inlet is in the right direction in the X-axis direction, X
It was confirmed that the inflow amount in the axial direction increased significantly. This proves that even if a hole in the X-axis direction is formed in the vanishing model, a sufficient filling density of the molding sand 7 can be ensured in the hole. However, when the sand inlet is directed leftward, it indicates that the amount of sand flowing in the X-axis direction is small. That is, when the hole in the X-axis direction is a blind hole, it indicates that the sand is not sufficiently filled depending on the direction.

As “Comparative Experimental Example 2”, the experimental apparatus shown in FIG. 7 is mounted and fixed on the table 3 of FIGS. 1 and 2, and one of the vibration motors 4, 4 or 4 ', 4' selected as appropriate. Table 4 shows the measurement results when the vibration time was set to 30 seconds in the forward rotation, followed by 30 seconds in the reverse rotation.

[0016]

Table 4 shows that the amount of inflow of sand in the X-axis direction is significantly increased in the X-axis direction irrespective of the direction of the sand inlet in comparison with the measurement results of Comparative Example 1 (Table 3). confirmed. This proves that even if a hole in the X-axis direction is formed in the vanishing model, a sufficient filling density of the molding sand 7 can be ensured in the hole regardless of the direction of the hole.

In the above-described embodiments, the present invention is applied to filling of molding sand in vanishing model casting.
The present invention can provide the same functions and effects as those of the above embodiment even when applied to the molding of a self-hardening mold.

[0019]

As described above, according to the present invention, two vibrating motors which are attached to a lower portion or a side of a table and have a parallel horizontal axis and which are appropriately selected are continuously connected in the same direction for a certain period of time. By rotating the table forward and then reversely, the table vibrates simultaneously in two directions, a vertical direction and a horizontal direction, but the horizontal vibration vibrates in the first half and the second half in different directions. Even if a hole in the horizontal uniaxial direction is formed in the disappearing model or the self-hardening mold, a sufficient filling density of the molding sand can be ensured in the hole.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view showing a first conventional example.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a front view showing a second conventional example.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a perspective view of an experimental apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine stand 2 Spring 3 Table 4, 4 'Vibration motor 5 Casting frame 6 Lost model 7 Casting sand 8 Vibration motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22C 15/10

Claims (1)

(57) [Claims] 1. A molding sand filling table on which a casting frame is detachably fixed on an upper surface is swingably disposed on a machine base via a spring, and extends parallel to the table by projecting to a lower portion or a side of the table. In a vibration device mounted with a horizontal axis and having two vibration motors each rotating in the same direction, two appropriately selected vibration motors are continuously rotated forward for a certain period of time and then rotated in reverse. A method for vibrating a vibrating device for filling foundry sand, comprising: