JPH10249488A - Molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the flow-out of molding sand at the time of supplying the molding sand and to execute the molding under good fastening of the molding sand at the lower end part of a mold periphery near the inner surface of a molding flask and/or at the lower end part of the mold near the inner and the outer surfaces of a pattern easily run short to the fastening of the molding sand. SOLUTION: This apparatus executes the molding with a blow head 54 blow- supplying the molding sand S together with compressed air. In such a case, after preliminarily compressing the prescribed position of the molding sand S supplied into a space demarcated with the pattern plate 9 and the molding flask 10 (containing a supplemental flask 11) by using a pre-compressing member 16 formed with a thin plate body 16A and a pressing member 17 formed with a squeeze body 17A, the whole molding sand is pressed.

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 supplied to 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, sand is spilled when the molding sand is supplied, and at the lower end of the periphery of the mold near the inner surface of the mold, especially each part of the mold and the pattern.
The mold tends to be insufficiently clamped at the lower end of the mold near the inner and outer surfaces of the mold, especially between the patterns or the pocket. This is because when the molding sand is supplied into the casting flask, the sand density tends to be small at the portion near the inner wall of the casting flask, and the pressing of the molding sand, particularly the inner and outer surfaces of the pattern and the inner wall of the molding 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 apt 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 the vicinity of the inner surface of the mold, there is a problem that the mold clamping of a portion having no 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]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and there is no casting spillage at the time of molding sand supply, and casting mold tends to have insufficient mold clamping. It is an object of the present invention to provide an apparatus for molding a mold by improving the mold clamping of the lower end of the mold near the inner surface of the frame and / or the lower end of the mold near the inner and outer surfaces of the pattern.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a mold molding apparatus according to the present invention supplies molding sand to a space defined by a pattern plate and a molding flask, and supplies the supplied molding sand. A mold molding apparatus for molding a mold by pressing a mold, a blow head that blows molding sand together with compressed air into a space defined by the pattern plate and the casting frame, and a pattern plate that defines the space. A lifting table that raises the casting frame to define a sealed space with the blow head, a lifting table that blows molding sand and raises and lowers the pattern plate and the casting frame; A pre-compression member and a pressing member, which can be moved horizontally in and out of the table and can be inserted into a casting frame to which the molding sand has been supplied, wherein the pre-compression member is formed by the casting. A thin plate which is located at a slight distance from the inner surface and / or the inner and outer surfaces of the pattern and which can be inserted into the molding sand, wherein the pressing member presses the upper part of the molding sand. Characterized in that it is a squeeze body.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. At the center of the left half of the base 1, four upward push-up cylinders 2, 2 are installed. A guide rod 4 is provided on the lower surface at the center of the table 3 for guiding the ascending and descending while keeping the ascending and descending 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 plate 9, a casting 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 provided. A rotating frame 12 that is rotated and moved directly above the elevating 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. 2, the carriage 14 is located at a position slightly spaced from the inner surface of the 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.

[0010] Further, an upward cylinder 51 is provided at the center of the right half of the base 1.
A push-up table 52 is fixed to the end of the piston rod, and guide rods 53, 53 are provided on the lower surface of the push-up table 52 for guiding the ascent and descent while maintaining the horizontal state. Above the push-up table 52, a blow head 54 is provided via a fixed frame 7A provided to extend from the ceiling frame 7.
A space is provided between the lifting table 4 and the lifting table 52 so that the assembly of the rotating frame 12, the pattern plate 9, the casting frame 10, and the filling frame 11 can move horizontally and pass therethrough. The blow head 54 is provided with an opening / closing gate 55 at the upper end so that sand can be supplied, and has an air introduction port 58 communicated with a compressed air source 56 via an opening / closing valve 57 on the upper side. A blow plate 62 provided with a sand cylinder 59 provided, a vent hole 61 with a vent plug for closing a bottom portion of the sand cylinder 59 and opening a sand blowing hole 60 penetrating vertically and exhausting compressed air; It consists of.

The operation of the above-described apparatus will be described. In the state shown in FIGS. 1 and 2, the four lifting cylinders 2 and 2 are operated to raise the lifting table 3 to push up the combined body on the rotating frame 12 to which the casting sand S has been supplied. The foundry sand S is the thin plate member 16 of the preliminary compression member 16.
A, the pre-compressed body 16 is lifted from the carriage 14 at the lower end thereof, the upper end thereof is brought into contact with the stopper member 25, and the ascent is further continued to insert the thin plate body 16A into the molding sand S to lower the lower end of the thin plate body 16A. Is stopped slightly above the pattern plate 9. (FIG. 3) The supply of the molding sand S to the other combined body left on the rotating frame 12 during this period is started as described later.
In this way, by inserting the sheet body 16A into the molding sand S in the casting frame 10, the peripheral portion near the inner surface of the casting frame 10 is pre-compressed, and the filling density of the molding sand S is increased.

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.
Is positioned above the casting frame 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, and further raise the pressing member 17 to the stopper member. The squeeze body 17A is raised and stopped until the lower surface of the squeeze body 17A substantially coincides with the lower end of the squeeze frame 11. 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. 4). 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, first, the squeeze body 17A is extracted from the filling frame 11, and then 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 open / close roller conveyor. Becomes a die-cut state.

Precompression by the thin plate 16A (FIG. 3)
The following operation is performed from the time when the squeeze body 17A presses (FIG. 4) and removes the mold (FIG. 5). That is, the upward cylinder 51 is actuated, the lifting table 52 is raised, and the combination of the pattern plate 9, the casting frame 10, and the filling frame 11 on the rotating frame 12 is pushed up. Blowhead 5 replenished with S
After the blow plate 62 of FIG. 4 is fitted (FIG. 3), the on-off valve 57 is opened and the compressed air is blown into the sand cylinder 59 of the blow head 54.
The molding sand S is blown and supplied together with the compressed air into the closed space defined by the combination body and the blow plate 62 through the sand blowing hole 60 (FIG. 4). At this time, the compressed air is exhausted from the vent hole 61 with the vent plug, and the molding sand S is supplied without leaking from the closed space. Thereafter, the upward cylinder 51 is operated in reverse to lower the push-up table 52 to disengage the fitting of the filling frame 11 and the blow plate 62, and to move the combined body filled with the molding sand S to the rotating frame 12.
It is placed on. (Fig. 5)

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 to position the pre-compression member 16 immediately above the lifting table 3 and the opening / closing gate 55 of the blow head 54 is opened to supply the molding sand S into the sand cylinder 59 so that the entire body is replenished. Is in the state of FIG. Hereinafter, the above operations are repeated to form the molds sequentially. In the above embodiment, the sheet body 16A is
Although it is arranged corresponding to a position slightly spaced from the inner surface of the casting flask 10, it may be added at a position slightly spaced from the inner and outer surfaces of the pattern 9A as shown in FIG. It is possible to cope with only the inner and outer surfaces of the pattern 9A, or to add a rod 16B corresponding to the pocket of the pattern 9A as shown in FIG. Although a plate-like squeeze body 17A is shown as the pressing member, it may be a segment squeeze hood or a diaphragm squeeze head. Further, in the above embodiment, the lifting table 52 is disposed below the blow head 54. However, the lifting table 52 can be omitted by providing the blow head 54 so as to be able to move up and down.

[0015]

According to the present invention, by adopting the above-mentioned structure, the molding sand is supplied to the space defined by the pattern plate and the casting frame (including the filling frame) without sand spillage. The lower edge of the inner surface of the flask and / or
Or, after pre-compressing the molding sand near the inner and outer surfaces of the pattern,
Since the entire molding sand is pressed to form the mold, the mold can be molded by improving the mold clamping of the portion where the molding sand tends to be insufficient. 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 partially cutaway front view showing a pre-compressed state of molding sand.

FIG. 4 is a partially cutaway front view showing a pressed state of molding sand.

FIG. 5 is a partially cutaway front view showing a die-cut state of the mold making.

FIG. 6 is a partially cutaway front view showing another embodiment of the thin plate member.

FIG. 7 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 Pre-Compression Member 17A Squeeze Body 17 Pressing Member 52 Push-Up Table 54 Blow Head S Casting Sand

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kuniyasu Mori 18-6 Sairokukoji Temple, Yawata-cho, Toyokawa, Aichi Prefecture

Claims (4)

[Claims] 1. A mold molding apparatus for supplying molding sand to a space defined by a pattern plate and a molding flask, and molding the mold by pressing the supplied molding sand. A blow head that blows molding sand into the space defined by the casting frame together with compressed air, and a push-up that raises the pattern plate and the casting frame that define the space to define a closed space with the blow head. A table, an elevating table for elevating and lowering the pattern plate and the casting frame to which the molding sand has been blown and supplied, and a horizontally movable entrance / exit directly above the elevating table, and the molding sand is removed. A precompression member and a pressing member which can be inserted into the supplied flask and the precompression member is spaced apart from the inner surface of the flask and / or the inner and outer surfaces of the pattern. Is located And a pressing plate is a squeeze member for pressing an upper portion of the molding sand. 2. A molding apparatus for supplying molding sand to a space defined by a pattern plate and a casting frame, and pressing the supplied molding sand to form a mold. A blow head that is provided to blow molding sand into the space defined by the pattern plate and the casting frame together with compressed air, and an elevating unit that raises and lowers the pattern plate and the casting frame to which the molding sand is blown and supplied. A table, and a pre-compression member and a pressing member which are horizontally movable directly above and below the lifting table and which can be inserted into a molding flask supplied with the molding sand, and The pre-compression member is a thin plate which is located at a slight distance from the inner surface of the flask and / or the inner and outer surfaces of the pattern and is insertable into the molding sand. Press the upper part of the foundry sand A mold making apparatus characterized by being a squeeze body that is made. 3. The molding apparatus according to claim 1, wherein the preliminary compression member comprises a rod-shaped body in addition to the thin plate body. 4. The pre-compression member and the pressing member are mounted on a carriage which can be reciprocated in a horizontal direction, and selectively movable to a position immediately above the lifting table. The molding apparatus according to claim 1, 2 or 3, wherein