JP3659385B2 - A storage box device for a model box for suction filling molding. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a model box storage box device in which a vertically divided model box is stored in a box, and the inside of the box is sucked and pressure-reduced to fill a casting sand into a cavity of the model box to mold a mold.
[0002]
[Prior art]
Conventionally, as the above-mentioned suction filling molding apparatus, as shown in Japanese Patent Laid-Open No. 6-48578, the model box does not open in the box when the molding sand is filled into the cavity of the model box by suction pressure reduction. In general, a pair of cylinder devices that are clamped and fixed are arranged.
[0003]
[Problems to be solved by the invention]
However, in the suction filling molding apparatus as described above, the cylinder apparatus for clamping and fixing the model box becomes large, and there is a problem that the box for storing these is enlarged and the manufacturing cost is increased.
Further, the cylinder device has a problem that the model box is damaged unless it is clamped with an appropriate pressure to clamp the model box.
The present invention has been made in view of the above-described problems, and is designed so that the model box is clamped and fixed with an appropriate pressure by a simple mechanism when the molding sand is sucked and vacuum filled into the cavity of the model box. An object of the present invention is to provide a storage box device for a model box for suction filling molding in which the size of the device is reduced.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a storage box device for a suction filling molding model box according to the present invention is provided with a suction filling molding model placed so as to be relatively movable up and down above a support table communicated with a vacuum source. A box storage box device,
An air introduction port leading to the outside air is provided on both left and right side surfaces of the box with a casting sand supply port formed in the ceiling and the lower end opened, and an inner air pressure and a front side corresponding to the air introduction port in the box A partition pressure receiving plate that can be pushed inward by a pressure difference from the outside air pressure is arranged, and a pressure plate is attached to the front surface of the partition pressure receiving plate via a push bar.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, a vibration table 4 is provided via air springs 3, 3 on an upper part of a support table 2 that can be moved up and down and communicated with a vacuum source (not shown) via a hose 1. Are mounted with vertically divided model boxes 6 and 6A provided with a plurality of vent holes 5 and 5 communicating with the cavity C from the outer surface.
In FIG. 1, the support table 2 is raised in the above state and pressed against the lower end of the box 7 fixed upward, so that the box 7 surrounds the vibration table 4 and the model boxes 6 and 6A. .
The box 7 is provided with a casting sand supply port at the center of the ceiling, and is provided with air introduction ports 8 and 8 that open to the lower side and communicate with the outside air on the left and right side surfaces.
[0006]
A partition pressure receiving plate 9, 9 is slidably arranged in front of the box 7 corresponding to the air inlets 8, 8 while maintaining airtightness. Between them, they are connected via a plurality of spring bodies 10, 10 made of coil springs, bamboo springs, gas springs or the like.
In addition, pressure plates 12 and 12 are connected to front central portions of the partition pressure receiving plates 9 and 9 via push rods 11 and 11, and a plurality of claw plates 13 and 12 are connected to the front surfaces of the pressure plates 12 and 12. 13 is attached at an appropriate interval so that the vent holes 5 and 5 are not blocked by the pressure plates 12 and 12.
Further, a sand hopper 15 having a slide gate 14 attached to the lower end is provided at the upper center of the ceiling of the box 7.
[0007]
The partition pressure plate 9 and the pressure plate 12 include a front surface (surface corresponding to the model boxes 6 and 6A) Sp of the pressure plate 12, and a rear surface (surface corresponding to the air inlet 8) area Sr of the partition pressure plate 9. When the inside of the box 7 is sucked and depressurized, the partition pressure receiving plates 9 and 9 are caused by the pressure difference between the box 7 internal pressure and the back pressure of the partition pressure receiving plates 9 and 9. The model box 6, 6A is clamped through the pressure plate 12 and the claw plates 13, 13 by moving forward.
Furthermore, the relationship between the total area SP of the surfaces of the two pressure plates 12 and 12 corresponding to the model boxes 6 and 6A and the cross-sectional area SM of the mold to be molded is such that SP ≧ SM. The model boxes 6 and 6A are prevented from being opened by the foundry sand S introduced into the cavities C of the boxes 6 and 6A.
[0008]
The push rods 11, 11 attached to the front surfaces of the partition pressure plates 9, 9 can be adjusted in length according to the size of the model boxes 6, 6A and the size of the model boxes 6, 6A. The pressure plates 12, 12 can be replaced with other pressure plates at the tips of the push rods 11, 11 so that the clamping force by the pressure plates 12, 12 can be adjusted accordingly.
[0009]
The operation of the apparatus configured as described above will be described. In FIG. 1, after the vertically split model boxes 6 and 6A are placed on the vibration table 4 at the position where the support table 2 and the vibration table 4 are lowered, the support table 2 is lifted and pressed against the lower end of the box 7. Further, the air springs 3 and 3 push up the vibration table 4 and press the model boxes 6 and 6A against the ceiling of the box 7.
In this state, the inside of the box 7 is sucked and depressurized through the hose 1. As a result, a differential pressure between the pressure in the box 7 and the atmospheric pressure from the air inlets 8 and 8 acts, and the partition pressure receiving plates 9 and 9 move toward the center of the box 7 where the pressure is low, and the push rod 11 , 11, the pressure plates 12, 12 and the claw plates 13, 13 are clamped to fix the model boxes 6, 6 </ b> A (see the pressure plate 12, the claw plate 13 in FIG. 2).
[0010]
Here, the vibration table 4 is operated and the slide gate 14 is opened, and the casting sand S accumulated in the sand hopper 15 is filled into the cavities C of the model boxes 6 and 6A by suction pressure reduction to the state shown in FIG. Become.
At this time, the cavity C that has been kept in a decompressed state until the slide gate 14 is opened sucks the foundry sand S, so that the pressure increases. Incidentally, when the pressure behavior in the box 7 and the cavity C during the suction filling of the foundry sand S was measured, the pressure Pca in the cavity C was always higher than the pressure Pch in the box 7 as shown in FIG. understood. That is, it can be seen that the differential pressure Pca-Pch between Pca and Pch shown in FIG. 3 acts as a force for opening the model boxes 6 and 6A.
[0011]
In this state, the differential pressure acting on the partition pressure receiving plates 9 and 9 is the differential pressure ΔPch between the atmospheric pressure and Pch, and Pca does not become larger than the atmospheric pressure, so that the relationship ΔPch> (Pca−Pch). Therefore, the pressure plates 12 and 12 are actuated by the differential pressure acting on the partition pressure receiving plates 9 and 9, and the model boxes 6 and 6A are clamped to suck the model boxes 6 and 6A by the differential pressure of Pca-Pch. Prevents opening during vacuum filling.
It should be noted that the relationship between the front surface area Sp corresponding to the model box of the single pressure plate 12 and the rear surface area Sr corresponding to the air inlet 8 of the single partition pressure receiving plate 9 is set to Sp ≦ Sr. The pressure plate 12, 12 can effectively increase the surface pressure with which the model boxes 6, 6 </ b> A are clamped.
[0012]
In addition, the model box 6, 6A is opened by the suction differential pressure by setting the relationship between the total area SP of the front surfaces of the two pressure plates 12, 12 and the sectional area SM of the mold to be molded to SP ≧ SM. The load at which the pressure plates 12 and 12 clamp the model boxes 6 and 6A is larger than the load to be applied. Therefore, the load of the pressure plates 12 and 12 for clamping the model boxes 6 and 6A is optimized by providing a structure in which the pressure plates 12 and 12 can be exchanged according to the size of the model boxes 6 and 6A (molds to be molded). It becomes possible.
[0013]
Thus, when the suction filling of the foundry sand S is completed, the slide gate 14 is closed and the operation of the vibration table 4 is stopped, and the state is maintained until the foundry sand S is hardened.
Next, the suction by the hose 1 is stopped and the atmosphere is introduced into the box 7. As a result, the inside of the box 7 and the back side of the partition pressure plates 9 and 9 become atmospheric pressure, and the partition pressure plates 9 and 9 are returned to the state shown in FIG. Thereafter, the support table 2 is lowered, the model boxes 6 and 6A on the vibration table 4 are taken out, and the molded mold is taken out.
[0014]
In the above-described embodiment, the partition pressure plates 9 and 9 are configured to be returned in the direction of the air inlets 8 and 8 by the spring bodies 10 and 10, but the partition pressure plates can be used as shown in FIG. The spring bodies 10 and 10 can be omitted by forming the flexible film bodies 9A and 9A on the upper and lower ends of the box 7.
Furthermore, the vibration table 4 in the embodiment may be a simple table in which the vibration mechanism is omitted when the mold to be molded is not a complicated shape and sand filling is easy.
Although the box 7 in the embodiment is fixed, the support table 2 may be fixed and the box 7 may be moved up and down.
[0015]
【The invention's effect】
As is apparent from the above description, the present invention is a storage box device for a model box for suction filling molding, which is disposed above and below a support table communicated with a vacuum source so that it can be moved up and down relatively.
An air introduction port leading to the outside air is provided on both left and right side surfaces of the box with a casting sand supply port formed in the ceiling and the lower end opened, and an inner air pressure and a front side corresponding to the air introduction port in the box A partition pressure plate that can be pushed inward by a pressure difference from the outside air pressure is arranged, and a pressure plate is attached to the front surface of the partition pressure plate via a push rod. When suction sand is filled under reduced pressure, the model box is clamped and fixed with an appropriate pressure by a simple mechanism, so that the scale of the apparatus can be reduced and the production cost can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing a state immediately before clamping a model box in an embodiment of the present invention.
FIG. 2 is a longitudinal front view showing a state of suction filling of foundry sand.
FIG. 3 is a graph showing the behavior of cavity internal pressure and box internal pressure during suction filling of foundry sand.
FIG. 4 is a longitudinal front view showing another embodiment of the partition pressure receiving plate.
[Explanation of symbols]
1 Support table 6 6A
Model box 7 Box air inlet partition pressure receiving plate 9A Film body 10 Spring body Extrusion bar Pressure plate Claw plate

Claims (9)

This is a storage box device for a suction filling molding model box that is arranged so as to be able to move up and down relatively above a support table communicated with a vacuum source, with a casting sand supply port in the ceiling and a lower end opened. to the right and left side surfaces of the box (7), an air inlet communicating with the outside air (8,8) provided in front corresponding to the air inlet openings in the box (7) in (8,8), the air inside partition receiving plate which is in extrudable inward direction by the differential pressure between the pressure and the ambient air pressure (9,9) is arranged, via a rod (11, 11) extruded into the front of the partition switching pressure receiving plate (9, 9) And a pressure box ( 12, 12 ) attached thereto, a storage box device for a model box for suction filling molding. 2. The storage box device for a suction filling molding model box according to claim 1, wherein the partition pressure plate ( 9, 9 ) is elastically returnable. Wherein the front area of the pressing plate (12) (Sp), the partition receiving plate (9) back area (Sr) the relationship between (Sp) ≦ claim 1 or 2, characterized in that the (Sr) A storage box device for the suction filling molding model box. The relationship between the total front surface area ( SP ) of the two pressure plates ( 12, 12 ) and the cross-sectional area ( SM ) of the mold to be molded is ( SP ) ≧ ( SM ). Item 4. A storage box device for a model box for suction filling molding according to item 1, 2 or 3. 5. A suction-fill molding model box according to claim 1, wherein a plurality of claw plates ( 13, 13 ) are arranged on the front surface of the pressure plate ( 12 ) at intervals. Box equipment. The partition pressure plate ( 9, 9 ) is connected to the inner surface of the box ( 7 ) via a plurality of spring bodies ( 10, 10 ) for return. A storage box device for the suction filling molding model box. 6. The storage box device for a model box for suction filling molding according to claim 1, wherein the partition pressure plate is made of a flexible film body ( 9A, 9A ) . The push rod ( 11, 11 ) attached to the front face of the partition pressure plate ( 9, 9 ) is adjustable in length, wherein the length is adjustable. A storage box device for the suction filling molding model box. The suction filling according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the pressure plate ( 12, 12 ) is detachable from the push-out bar ( 11, 11 ). Storage box device for modeling model boxes.

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