JP3304037B2 - Mold making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern plate having a pattern mounted on an upper surface thereof, and an apparatus for molding a mold by pressing molding sand put into a space defined by a casting frame.

[0002]

2. Description of the Related Art Conventionally, in the molding of a mold by pressing as described above, the lower end of the mold near the inner surface of the mold, in particular, the lower end of the mold near each part of the mold and the inner and outer surfaces of the pattern, especially the pattern of the pattern. There is a tendency that mold clamping between the pockets or the pockets tends to be insufficient. This is because when casting sand is poured into the casting flask, the sand density tends to be low in the portion near the inner wall of the casting flask, and the pressing of the molding sand, especially the inner and outer surfaces of the pattern, the inner wall of the casting flask, This is because the pressing force is not easily transmitted to the molding sand in this portion due to the influence of the friction of the molding sand. A mold having such a part with poor mold clamping is likely to lose its shape and is easily deformed at the time of pouring, so that a sound casting with good dimensional accuracy cannot be obtained. For this reason, the mold is pre-filled with jolt in order to obtain sufficient mold clamping, pre-filled with molding sand by flowing compressed air into molding sand, or a long protrusion on the lower peripheral edge of the pressing plate It is known to provide an object and strongly press near the inner surface of the flask.

However, in the case of pre-filling with Jolt,
There is a problem that vibration and noise are intense, and a robust structure that can withstand these impacts is required. Further, a device which allows compressed air to flow through the molding sand and pre-fills it requires high-pressure air, requires pressure-resistant air equipment, an air-sealing mechanism for each member, and the like. Further, when a long protrusion is provided on the periphery of the lower surface of the pressing plate to strongly press near the inner surface of the mold, there is a problem that the mold clamping of a portion without the protrusion is weakened.

In order to form a mold of a product cavity having a more complicated shape, a large number of cylinders are provided facing downward, their piston rods are pressed into mold sand, the whole is pre-compressed, and the piston rod is pulled out. After that, the whole molding sand is compressed by squeeze plate.
No. 21,577. However, this device requires a large number of cylinders, and there is a problem that the device becomes complicated and large. Also, there has been proposed a mold molding method in which a plurality of positions programmed in advance are sequentially pressed by one pressing rod, locally pressurized and compressed, and then the entire molding sand is squeezed and compressed by a squeeze member (Japanese Patent Laid-Open No. Hei 4 (1994)). -284
53 publication). However, this method has the problems that the implementation apparatus must be complicated and that a large amount of time is required for pre-compression.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and has a lower peripheral portion and / or a lower portion of a mold near an inner surface of a casting flask in which molding sand of molding sand tends to be insufficient. It is an object of the present invention to provide an apparatus for molding a mold by improving mold clamping at a lower end portion of the mold near inner and outer surfaces of the mold.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a mold forming apparatus according to the present invention forms a mold by pressing molding sand put into a space defined by a pattern plate and a molding flask. An up-and-down table for raising and lowering the pattern plate and casting frame into which casting sand has been introduced, and a horizontally movable input / output device directly above the up / down table. A pre-compression member and a pressing member which can be inserted into the casting flask into which the sand is charged, wherein the pre-compression member has a slight gap with respect to the inner surface and / or the inner and outer surfaces of the pattern. And a sheet-like body and a rod-like body which are placed in the molding sand and can be inserted into the molding sand, and wherein the pressing member is a squeeze body for pressing an upper part of the molding sand. Further, the pre-compression member and the pressing member are mounted on a carriage which is reciprocally movable in a horizontal direction, and are selectively movable to a position immediately above the elevating table. Also, in the present invention,
The mold making apparatus is defined by a pattern plate and a flask.
A mold that presses the casting sand into the space to form a mold
A molding apparatus, wherein the pattern press is charged with casting sand.
A lifting table for raising and lowering the casting frame and the casting frame, and the lifting table
Horizontal movement directly above and below the bull
Pre-compression part made insertable into the casting flask with casting sand
Material and a pressing member, wherein the preliminary compression member is
The inner surface of the casting flask and / or the inner and outer surfaces of the pattern
It is located at a dry interval and inserted in the foundry sand.
The pressing member is a casting.
It is a squeeze body that presses the upper part of the sand.
The compression member and the pressing member can reciprocate horizontally.
And placed directly above the lifting table
It is characterized by being selectively movable.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. At the substantially central part of the base 1, four upward lifting cylinders 2, 2 are provided, and a lifting table 3 is fixed between the ends of the piston rods of the lifting cylinders 2, 2 and the lifting table 3 is fixed. A guide rod 4 is provided on the lower surface of the center of the table 3 for guiding the table 3 while keeping the table 3 horizontal. At the upper part of the base base 1, a column 5 and a column 6, the lower part of which is a rotatable shaft 5A, are erected so as to sandwich the elevating table 3. The ceiling frame 7 connects between the upper end of the support 5 and the support 6. On the rotating shaft 5A, two sets of a combination of a pattern 9, a cast frame 10, and a filling frame 11 with a pattern 9A mounted on a carrier 8 are mounted on both ends thereof, and the combination is alternately used as a base. A rotating frame 12 which is rotated and moved directly above the lifting table 3 by the operation of a rotating cylinder 12A attached to the base 1 is fixed.

At the upper positions of the column 5 and the support column 6, truck running rails 13, 13 extending in the front-rear direction are provided so as to face each other, and the truck running rails 13, 13 are formed in a frame shape. The wheels of the formed carriage 14 are engaged, and the ceiling frame is
It is connected to a traveling cylinder 15 attached to the system 7 so as to be able to reciprocate. As shown in FIG. 3, the carriage 14 is located at a position slightly apart from the inner surface of the casting flask 10,
A pre-compression member 1 comprising a thin plate member 16A which extends downward and can be inserted into the molding sand S in the casting flask 10.
6 and a pressing member 17 having a lower part provided with a squeeze body 17A which is inserted into the casting frame 10 and presses the upper part of the foundry sand S, at an appropriate distance from each other, and can be moved up and down. And is suspended via the

At the intermediate position between the column 5 and the support 6, there are provided link mechanisms 19, 19 and roller frames 20, 20 which are opened and closed by the operation of the cylinders 18, 18.
A number of rollers 21 and 21 are attached to form an openable roller conveyor as a whole. Further, the link mechanism 1
At an intermediate position between the rollers 9 and 19, receiving members 22 and 22 for receiving the filling frame 11 are mounted so that their tips are located outside the tips of the rollers 21 and 21. Roller conveyors 23 and 24 for transferring the casting frame 10 are disposed before and after the opening and closing roller conveyor, and the pre-compression member 16 and the pressing member 17 are raised on the lower surface of the center portion of the ceiling frame 7. A stopper member 25 for stopping and receiving the pressing force is provided.

The operation of the above-described apparatus will be described. In the state shown in FIGS. 1 to 3, the four lifting cylinders 2 and 2 are operated to raise the lifting table 3 and push up the combined body on the rotating frame 12 into which the casting sand S has been introduced. Casting sand S is the thin plate 16A of the pre-compression member 16.
The pre-compressed body 16 is lifted from the carriage 14 at the lower end, the upper end of the pre-compressed body 16 is brought into contact with the stopper member 25, and further raised to insert the thin plate 16A into the molding sand S, so that the lower end of the thin plate 16A The ascent is stopped at a point slightly above the plate 9. During this time, the supply of the molding sand S to the other combined body left on the rotating frame 12 is started. (FIG. 4) As described above, the thin plate body 16A is inserted into the molding sand S in the molding flask 10, whereby the peripheral portion near the inner surface of the molding flask 10 is pre-compressed to increase the filling density of the molding sand S. .

Next, when the lifting cylinders 2 and 2 are operated in reverse to lower the combined body and the thin plate body 16A is pulled out of the casting frame 10, the lowering is stopped, and the traveling cylinder 15 is operated to operate the carriage 14 To the right in FIG.
After being positioned above the casting flask 10, the lifting cylinders 2 and 2 are operated to raise the combination to bring the squeeze body 17A into contact with the upper surface of the molding sand S.
Is pressed against the stopper member 25 to stop the ascending operation, and the assembling body is further continued to ascend until the lower surface of the squeeze body 17A substantially coincides with the lower end of the filling frame 11 and is stopped. As a result, the casting sand S is entirely squeezed from the upper part 1
It is pressed (squeezed) by 7A to form a mold (FIG. 5). Next, the cylinders 18, 18 are operated to open and close the rollers.
With the conveyer closed, the lifting cylinders 2 and 2 are operated in reverse to lower the lifting table 3 to the position shown in FIG. As a result, after the squeeze body 17A is first extracted from the filling frame 11, the filling frame 11 is received by the receiving members 22, 22, and the casting frame 10 is received by the rollers 21, 21 of the opening and closing roller conveyor. State. Meanwhile, the casting sand S has been completely charged into the combined body on the rotating frame 12.

Next, the casting frame 10 containing the mold is sent out from the opening and closing roller conveyor to the roller conveyor 24, and the empty casting frame 10 is transferred from the roller conveyor 23 to the opening and closing roller conveyor. 2 operates to raise the carrier 8 and the pattern plate 9 so that the empty flask 1
The mold is set to zero and the frame is set to the filling frame 11, and the cylinders 18 and 18 are operated in reverse to open the roller conveyor. Next, the push-up cylinders 2 and 2 are operated in reverse to place a new combination on the rotary frame 12, and the rotary cylinder 12A is operated to rotate the rotary frame by 180 degrees so that the combination without the molding sand S is obtained. The body is moved outward, and the combined body into which the casting sand is charged is positioned above the lifting table 3. During this time, the traveling cylinder 15 is operated in reverse, and the pre-compression member 16 is positioned directly above the elevating table 3, so that the whole is in the state of FIG. Hereinafter, the above operation is repeated to form a mold. In the above embodiment, the thin plate 16
A is disposed at a position slightly spaced from the inner surface of the casting flask 10, but may be added at a position slightly spaced from the inner and outer surfaces of the pattern 9A as shown in FIG. , or pattern - to the corresponding corresponding equi need to add a rod-like body 16 B corresponding to the pocket portion of the emission 9A - or to correspond only to the inner and outer sides of the down 9A, the pattern as shown in FIG. 8 Can be. A plate-like squeeze body 1 is used as a pressing member.
Although 7A is shown, it may be a segment squeeze hood or a diaphragm squeeze head.

[0013]

According to the present invention, by adopting the above-mentioned structure, the inner surface of the casting flask is protected against the molding sand introduced into the space defined by the pattern plate and the casting flask (including the filling frame). After preliminarily compressing the molding sand near the lower edge and / or the inner and outer surfaces of the pattern, the entire molding sand is pressed to form a mold. Be able to make a mold. Further, there is a great advantage in terms of manufacturing cost and working environment without using many pressing cylinders or generating vibration and noise.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a partially cutaway front view showing a pre-compressed state of molding sand.

FIG. 5 is a partially cutaway front view showing a pressed state of molding sand.

FIG. 6 is a partially cutaway front view showing a die-cut state of the mold making.

FIG. 7 is a partially cutaway front view showing another embodiment of the thin plate member.

FIG. 8 is a partially cutaway front view showing another embodiment of the pre-compression member.

[Explanation of symbols]

 3 Elevating Table 9A Pattern 9 Pattern Plate 10 Cast Frame 11 Filling Frame 14 Cart 16A Thin Plate 16B Rod 16 Precompression Member 17A Squeeze Body 17 Pressing Member S Casting Sand

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Kyoko Arita (56) References JP-A-55-120450 (JP, A) JP-A-57-56138 (JP, A) JP-A 9-1288 (JP, A) JP-A-9-10892 (JP, A) JP-A-9-192779 (JP, A) JP-A-9-225585 (JP, A) JP-A-3-142038 (JP, A) JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22C 11/00-25/00

Claims (3)

(57) [Claims] 1. A mold molding apparatus for molding a mold by pressing molding sand put into a space defined by a pattern plate and a molding flask, wherein the pattern plate is supplied with molding sand. Lifting table for raising and lowering the casting frame, and the lifting table
A pre-compression member and a pressing member which can be moved in and out of the horizontal just above the bull and inserted into a casting flask into which the molding sand has been charged, wherein the pre-compression member is an inner surface of the molding flask. And / or a thin plate and a rod which are positioned at a slight distance from the inner and outer surfaces of the pattern and can be inserted into the foundry sand, and wherein the pressing member covers the upper part of the foundry sand. A mold making apparatus characterized by being a squeeze body to be pressed. 2. The apparatus according to claim 1, wherein said pre-compression member and said pressing member are mounted on a carriage reciprocally movable in a horizontal direction, and are selectively movable to a position immediately above said elevating table. The mold forming apparatus according to claim 1, 3. A mold molding apparatus for molding a mold by pressing molding sand put into a space defined by a pattern plate and a molding flask, wherein the pattern plate is supplied with molding sand. Lifting table for raising and lowering the casting frame, and the lifting table
A pre-compression member and a pressing member which can be moved in and out of the horizontal just above the bull and inserted into a casting flask into which the molding sand has been charged, wherein the pre-compression member is an inner surface of the molding flask. And / or a squeeze plate which is located at a slight distance from the inner and outer surfaces of the pattern and which can be inserted into the molding sand, wherein the pressing member presses an upper portion of the molding sand. Karadadea is, furthermore, said pre
The compression member and the pressing member can reciprocate horizontally.
And placed directly above the lifting table
A mold making apparatus characterized by being selectively movable.