JP3164273B2 - Carrier device with model surface plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier with a model surface plate, which is used in a method for compressing mold sand put in a mold molding space defined by placing a casting frame on a model surface plate on which a model is mounted. Related to the device.

[0002]

2. Description of the Related Art Conventionally, a method has been widely used in which mold sand is put into a mold molding space defined by a model platen and a casting frame, and the mold sand is compressed by compressed air. In this compression method, since the mold sand particles are moved along the flow of air, a vent hole is formed in the model surface plate and a vent plug is fitted and installed. Furthermore, it was guided below the carrier device of the model platen to secure a rise in hardness in a portion where the mold hardness was low. Here, the vent holes were independent on the upper surface of the model platen, but on the lower surface of the model platen, the vent holes were communicated by one chamber that was opened to the atmosphere or communicated with the atmosphere (for example, No. 55-154653). By the way, the present applicant has proposed a method of molding a mold by supplying compressed air at a stretch after sucking and removing the air between the sand grains of the raw sand put in the flask (Japanese Patent Application Laid-Open No. 63-163). 171246 gazette). In the case where a vent hole is used in this method, the following problems have occurred if the vent holes are connected as described above. That is, since the vent hole communicates with one chamber, the flow of air becomes uneven due to the filling condition of the raw sand put on the vent plug at the time of depressurization, so that a large amount of air flows and a small amount of air. There is a place where only the water flows, and as a result, the raw sand on the vent plug where a lot of air has flowed, the moisture evaporates,
Where the air flow was small, there was a problem that the effect of the vent plug was small and the mold hardness did not increase. The present invention has been made in view of the above-described drawbacks, and has an object to provide a carrier device with a model surface plate, which is used in a method of compressing mold sand by air after evacuating a mold space using a vacuum. .

[0003]

Means for Solving the Problems In order to achieve the above object, a carrier device with a model surface plate according to the present invention comprises: a model surface plate fitted into a set recess of the model surface carrier device; In the structure of the model surface plate and the carrier device thereof in which a vent plug is inserted into a plurality of vent holes provided, an independent chamber for each of the plurality of vent holes is provided at least in the model surface plate or the model surface carrier device. Provided on one side and put the adjustment piece in the chamber
Thus, the capacity of the chamber is adjusted .

[0004]

According to the present invention, an appropriate amount of air can be exhausted and introduced from each vent hole by using the above-mentioned solution.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a model surface plate 2 having a model 1
Has chambers 3 and 3 on the lower surface. The model surface plate 2
Is mounted on the model platen carrier device 4. Vent holes 5 and 5 are formed in the model surface plate 2, and vent plugs 6 and 6 are fitted to upper ends of the vent holes 5 and 5. Here, vent holes 5 and 5
Each of the chambers 3, 3 communicates with the chambers 3, 3 in a one-to-one manner.
3 are independent. Further, the chambers 5, 5 are sealed by seals 7, 7 as needed.

[0006] As shown in Fig. 5, after the molding sand 52 is put into a molding space defined by the model surface plate 2 and the molding flask 51, the molding flask 51 and the cover 54 are illustrated. Crimping as in 6. Next, the vacuum device 55 is operated to reduce the pressure in the closed space defined by the model base 2, the casting frame 51, and the cover 54 to a predetermined vacuum state. At this time, the pressure in the chambers 3 and 3 is also reduced to a vacuum state. Since the volumes of the chambers 3 and 3 are fixed, air is not excessively exhausted from the vent plugs 6 and 6 on the chambers 3 and 3. When the degree of vacuum in the closed space reaches a predetermined value, air is introduced from the air conduit 57 through the valve 56,
Compress. The air to be introduced may be compressed air or air at atmospheric pressure. The air introduced at this time fills the vent holes 5, 5 and the chambers 3, 3 via the mold sand 52 and the vent plugs 6, 6. The mold sand 52 is compressed by this flow of air. The degree of vacuum is measured by the pressure sensor 58.

[0007] As shown in FIG. 2, adjusting pieces 8, 8 for adjusting the capacity can be placed in the chambers 3, 3.
Thereby, the exhaust amount and the ventilation amount can be adjusted. The volume of the adjustment pieces 8, 8 is smaller than the volume of the chambers 5, 5, and the material of the adjustment pieces 8, 8 can be a metal such as steel or copper. Chamber 3,
3 can be provided on the model platen carrier device 4 (FIGS. 3 and 4). If the distance between adjacent vent plugs is extremely short, a plurality (for example, two or three) may be used.
One chamber may be provided for each vent plug.

As is apparent from the above description, the present invention provides a model fitted to the set recess of the model surface plate carrier device.
A mold platen and a plurality of vent holes drilled in the model platen
Carrier device with model surface plate with vent plug inserted
Independently for each of the plurality of vent holes.
Of the model platen or the carrier of the model platen
At least on one side and put the adjustment piece into the chamber
It was either <br/> et to adjust the volume of the chamber by and can be evacuated in a chamber independent of the appropriate amount of air co
The amount of exhaust and the amount of ventilation can be adjusted . Therefore, the green sand near the vent plug is not dried due to excessive exhaust. Also, when introducing atmospheric pressure or compressed air, an appropriate amount of air can be flowed, so that evaporation of moisture in raw sand is suppressed, and the surface stability of the mold is good, and a mold with uniform hardness is obtained. The effect on the industrial world that can be done is remarkable.

[Brief description of the drawings]

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

FIG. 2 is a schematic sectional view showing an embodiment of the present invention.

FIG. 3 is a schematic sectional view showing another embodiment of the present invention.

FIG. 4 is a schematic sectional view showing another embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a use state of the embodiment.

FIG. 6 is a schematic sectional view showing a use state of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Model 2 Model surface plate 3 Chamber 4 Model surface carrier device 5 Vent hole 6 Vent plug 8 Adjustment piece

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22C 11/00-25/00

Claims (1)

(57) [Claims] 1. A set recess 4 of a model surface carrier device 4.
(a) and a plurality of vent holes (5, 5) perforated in the model surface plate (2) and a vent plate (6, 6) fitted in the model surface plate carrier device. Independent chambers 3 and 3 are provided for at least one of the model surface plate 2 and the model surface carrier device 4, respectively , and adjustment pieces are provided in the chambers 3 and 3, respectively.
The capacity of the chambers 3 and 3 is adjusted by adding
A carrier device with a model surface plate, characterized in that it is adjusted .