WO2011049249A2

WO2011049249A2 - Mold molding device and mold molding method

Info

Publication number: WO2011049249A2
Application number: PCT/JP2011/052641
Authority: WO
Inventors: 昌秀野口; 酒井　毅; 和憲小倉
Original assignee: 新東工業株式会社
Priority date: 2010-08-09
Filing date: 2011-02-08
Publication date: 2011-04-28
Also published as: JP5626639B2; CN102834200B; JP2012055968A; EP2604362A4; WO2011049249A3; CN102834200A; EP2604362A2; TW201210716A

Abstract

Disclosed are a mold molding device and a mold molding method whereby it is possible to prevent sand sticking to the inner wall of a sand hopper and simplify the structure of the device. After using a sand filling means to fill molding sand into a molding space formed by a molding frame, an overlay frame, and a pattern plate which is mounted on a pattern carrier, the molding sand which has been filled into the molding space is squeezed using a squeezing means and the mold is formed. The sand filling means is equipped with: a sand hopper which is disposed above the molding frame and the overlay frame, and which stores the molding sand; an open-close louver gate which is disposed inside the sand hopper; a sand supply port open-close means which is disposed in the upper section of the sand hopper, and which opens and closes a sand supply port for suppling the molding sand to the interior of the sand hopper; and an air jet chamber which is mounted on the inner surface of the sand hopper.

Description

Mold making apparatus and mold making method

The present invention relates to a mold making apparatus and a mold making method for making a mold by squeezing casting sand filled in a casting frame.

Conventionally, as a mold making apparatus, for example, a sand hopper having an opening at the top and an openable louver at the lower part and a squeeze means having a number of segment squeeze feet are connected and arranged. And what makes the said sand hopper and the said squeeze means carry in / out alternately above the filling frame is made publicly known (for example, refer patent document 1).

Patent Document 1: Japanese Patent Laid-Open No. 7-185740

However, the thing of patent document 1 has the problem that sand adheres to the inner wall face of the said sand hopper. In addition, since the sand hopper and the squeeze means are alternately carried in and out of the casting frame and the fill frame, a mechanism for running the sand hopper and the squeeze means is necessary, and thereby the structure of the apparatus There is a problem that becomes complicated.

The present invention has been made in view of the above problems, and provides a mold making apparatus and a mold making method capable of preventing sand adhesion to the inner wall surface of a sand hopper and simplifying the structure of the apparatus. The purpose is to provide.

In order to achieve the above object, the mold making apparatus of the present invention fills a molding space formed by a pattern plate, a casting frame and a filling frame placed on a pattern carrier with sand filling means, A molding apparatus for squeezing casting sand filled in the molding space by squeezing means to mold a casting mold, wherein the sand filling means is disposed above the casting frame and filling frame, and inside the molding frame. A sand hopper for storing foundry sand, an openable louver gate disposed in the sand hopper, and disposed at an upper portion of the sand hopper and for supplying the foundry sand into the sand hopper A sand supply port opening / closing means for opening and closing a sand supply port as an opening, and an air ejection chamber attached to the inner surface of the sand hopper.

The mold making apparatus according to the present invention also includes an elevating cylinder mounted on a base, a table connected to the elevating cylinder, the pattern plate, and surrounding the outer periphery of the pattern plate. A frame-shaped frame that is carried in and out of the table, a frame carrying-in / out mechanism that carries the casting frame in and out of the pattern carrier, and an inside of the frame carrying-in / out mechanism. The squeeze means provided, the fill frame disposed so as to be movable up and down above the casting frame, and disposed on the outside of the base and carried out from the top of the table to the outside of the base. The sand filling means for filling the molding space formed by the pattern plate, the casting frame, and the filling frame with the foundry sand.

Furthermore, the mold making apparatus of the present invention is characterized in that an air supply valve is communicated with the sand filling means.

Further, in order to achieve the above object, the mold making method of the present invention is a method in which a molding space formed by a pattern plate, a casting frame and a filling frame placed on a pattern carrier is filled with foundry sand by a sand filling means. A mold molding method for forming a mold by squeezing the foundry sand filled in the molding space with a squeeze means, the step of filling the molding space with the sand filling means with the sand filling means in the sand filling means A step of closing the sand supply opening / closing means, a step of jetting air from an air jet chamber attached to an inner surface of a sand hopper in the sand filling means, and a step of opening an openable louver gate in the sand filling means. It is characterized by having.

In the mold making method of the present invention, the pattern carrier is one of the two pattern carriers provided with a frame-like frame on which the pattern plate is placed and which surrounds the outer periphery of the pattern plate and moves up and down. The other pattern carrier is arranged on the upper side, and is placed on the outside of the base. Further, the empty cast frame and fill frame are placed on the one pattern carrier, and the other pattern carrier is placed. With the casting frame and filling frame filled with the foundry sand placed thereon, the one pattern carrier, empty casting frame and filling frame are carried out to the outside of the base, and The other pattern carrier, the step of carrying the casting frame and filling frame filled with foundry sand above the table, and the other pattern carrier, casting frame and filling frame filled with foundry sand. A step of raising, a step of causing the upper surface of the frame-shaped frame of the other pattern carrier to protrude from the parting surface of the pattern plate, and a filling frame in which the lower surface of the sand hopper is carried out of the base A molding space formed by a pattern plate placed on the one pattern carrier, an empty casting frame and a filling frame, and a squeeze member in the squeezing means is lowered to lower the foundry sand , Squeezing the frame, closing the casting frame loading / unloading mechanism, raising the pattern plate until the upper surface of the frame-shaped frame of the other pattern carrier and the parting surface of the pattern plate are raised to the same height. A step of lowering the squeeze member to secondary squeeze the foundry sand, and the molding space is filled with the foundry sand by the sand filling means. A step of further lowering the squeeze member to tertiary squeeze the foundry sand after completion of ascent of the pattern plate in the secondary squeeze, and a step of lowering the pattern plate in the other pattern carrier to remove the mold. A step, a step of separating the sand hopper from the filling frame carried outside the base, a step of lowering the other pattern carrier, a step of closing an openable louver gate in the sand filling means, Opening the sand supply port opening / closing means in the sand filling means, supplying the foundry sand into the sand hopper from the sand supply port, a filling frame disposed above the other pattern carrier, and the other pattern carrier A step of carrying an empty casting frame to a position between and a process of placing an empty casting frame and a filling frame on the other pattern carrier And a step of opening the cast-in / out mechanism.

Further, in the mold making method of the present invention, one of the pattern carriers is a table among the two pattern carriers on which the pattern plate is placed and a frame-like frame that surrounds the outer periphery of the pattern plate and moves up and down is provided. The other pattern carrier is arranged on the upper side, and is placed on the outside of the base. Further, the empty cast frame and fill frame are placed on the one pattern carrier, and the other pattern carrier is placed. With the casting frame and filling frame filled with the foundry sand placed thereon, the one pattern carrier, empty casting frame and filling frame are carried out to the outside of the base, and The process of carrying the other pattern carrier, casting frame and filling frame filled with foundry sand above the table, and the other pattern carrier, casting frame and filling frame filled with foundry sand A step of raising, a step of causing the upper surface of the frame-shaped frame in the other pattern carrier to protrude from the parting surface of the pattern plate, and a filling frame in which the lower surface of the sand hopper is carried out of the base And forming a molding space with a pattern plate placed on the one pattern carrier, an empty casting frame and a filling frame, and a casting filled with the other pattern carrier and foundry sand. The step of further raising the frame and the filling frame to primarily squeeze the foundry sand, the step of closing the casting frame loading / unloading mechanism, and the upper surface of the frame-shaped frame in the other pattern carrier and the parting surface of the pattern plate are the same height A step of raising the pattern plate until it reaches the size and secondary squeezing the foundry sand, and filling the foundry space with the foundry sand by the sand filling means And after the rising of the pattern plate in the secondary squeeze, the other pattern carrier, the casting frame filled with foundry sand and the filling frame are further raised to tertiary squeeze the foundry sand, and the other A step of lowering and removing the pattern plate in the pattern carrier, a step of separating the sand hopper from a filling frame carried out of the base, a step of lowering the other pattern carrier, and the sand A step of closing an openable louver gate in the filling means, a step of opening the sand supply opening / closing means in the sand filling means, and supplying the foundry sand into the sand hopper from the sand supply opening; and the other pattern carrier A step of carrying an empty casting frame into a position between the upper frame and the other pattern carrier; and the other pattern It has the process of mounting an empty casting frame and filling frame on a carrier, and the process of opening the said casting-frame carrying in / out mechanism, It is characterized by the above-mentioned.

Further, in the mold making method of the present invention, the molding sand in the molding space is opened by opening an air supply valve communicated with the sand filling means after the step of filling the molding space with the sand filling means by the sand filling means. The molding sand in the molding space is pre-compressed by allowing compressed air to flow therethrough.

The present invention provides a molding space formed by a pattern plate mounted on a pattern carrier, a casting frame, and a filling frame with sand filling means, and then squeezing the molding sand filled in the molding space. A mold making apparatus for squeezing a mold to form a mold, wherein the sand filling means is disposed above the casting frame and the filling frame and stores the foundry sand therein, and the sand hopper And an openable louver gate disposed inside the sand hopper, and a sand supply that is disposed above the sand hopper and opens and closes a sand supply port that is an opening for supplying the foundry sand into the sand hopper Since the mouth opening / closing means and the air ejection chamber attached to the inner surface of the sand hopper are provided, there are various effects such as prevention of sand adhesion to the inner wall surface of the sand hopper.

It is side surface sectional drawing which shows embodiment of this invention, Comprising: An empty casting frame and filling frame are mounted on the pattern carrier above a table, and filling sand is filled on the pattern carrier outside a base. It is a figure which shows the state in which the cast frame and fill-frame which were made were mounted. It is side surface sectional drawing which shows the state which carried out the empty casting frame and filling frame to the outer side of a base by rotating a turntable, and carried the casting frame and filling frame filled with foundry sand above the table. is there. It is side surface sectional drawing which shows the state which raised the casting frame, the filling frame, and the frame-shaped frame in the table side, and formed the molding space in the outer side of the base. It is side surface sectional drawing which shows the state which squeezed the foundry sand on the table side, and closed the cast-frame carrying in / out conveyor. It is side surface sectional drawing which shows the state by which the foundry sand was secondary squeezed on the table side, and the molding sand was filled into the molding space outside the base. It is side surface sectional drawing which shows the state which carried out the tertiary squeeze of the foundry sand in the table side. It is side surface sectional drawing which shows the state which the die cutting was made | formed on the table side and the pattern carrier, the casting frame, and the filling frame were lowered | hung outside the base. It is side surface sectional drawing which shows the state which mounted the casting frame on the roller in the table side, and supplied the foundry sand in the sand hopper on the outer side of the base. It is side surface sectional drawing which shows the state which mounted the empty casting frame and filling frame on the pattern carrier in the table side, and opened the casting-frame carrying in / out conveyor. It is an expanded sectional view of the sand filling means in FIG. It is side surface sectional drawing which shows 2nd Embodiment of this invention, Comprising: An empty casting frame and filling frame are mounted on the pattern carrier above a table, and foundry sand is on the pattern carrier on the outer side of a base. It is a figure which shows the state in which the cast frame and filling frame with which it filled were mounted. It is side surface sectional drawing which shows the state which carried out the empty casting frame and filling frame to the outer side of a base by rotating a turntable, and carried the casting frame and filling frame filled with foundry sand above the table. is there. It is side surface sectional drawing which shows the state which raised the casting frame, the filling frame, and the frame-shaped frame in the table side, and formed the molding space in the outer side of the base. It is side surface sectional drawing which shows the state which squeezed the foundry sand on the table side, and closed the cast-frame carrying in / out conveyor. It is side surface sectional drawing which shows the state by which the foundry sand was secondary squeezed on the table side, and the molding sand was filled into the molding space outside the base. It is side surface sectional drawing which shows the state which carried out the tertiary squeeze of the foundry sand in the table side. It is side surface sectional drawing which shows the state which the die cutting was made | formed on the table side and the pattern carrier, the casting frame, and the filling frame were lowered | hung outside the base. It is side surface sectional drawing which shows the state which mounted the casting frame on the roller in the table side, and supplied the foundry sand in the sand hopper on the outer side of the base. It is side surface sectional drawing which shows the state which raised the filling frame in the table side, and stopped all the many cylinders in the intermediate position. It is side surface sectional drawing which shows the state which mounted the empty casting frame and filling frame on the pattern carrier in the table side. It is an expanded detailed sectional view which shows the squeeze means in 2nd Embodiment. It is an expansion detailed sectional view for explaining an example of operation of squeeze means in a 2nd embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, a lifting cylinder 2 (hydraulic cylinder in this embodiment) is attached to the upper center of a base 1, and a table 3 is connected to the tip of the lifting cylinder 2. Guide rods 4 are disposed on both outer sides of the elevating cylinder 2, and the guide rods 4 are slidably passed through a holder 5 mounted on the base 1. The tip of the guide rod 4 is connected to the table 3.

And the support | pillar 6 is standingly arranged by the right-and-left both sides (refer FIG. 1) on the said base 1, Between the upper ends of this support | pillar 6, the upper frame 7 is constructed. A center portion of the turntable 8 is supported so as to be rotatable in a horizontal plane below one of the columns 6 (left side in FIG. 1), and the main shaft of the turntable 8 is on the left side in FIG. The post 6 is also used. A support member (not shown) is attached to the turntable 8, and

pattern carriers

9 and 9 A are placed on both ends of the turntable 8 via the support member (not shown). The turntable 8 is rotated by an actuator (not shown), and examples of the actuator include a hydraulic cylinder. The

pattern carriers

9 and 9A are carried in and out of the table 3 when the turntable 8 rotates while the table 3 is at the lower end.

Further,

pattern plates

10 and 10A are placed on the

pattern carriers

9 and 9A, and a frame-like frame 11 that moves up and down surrounding the outer periphery of the

pattern plates

10 and 10A is placed on the

pattern carriers

9 and 9A. Is provided. A cast frame W and a fill frame 17 are placed on the

pattern carriers

9 and 9A.

A plurality of (four in this embodiment) frame-like frame lifting cylinders 12 (hydraulic cylinders in this embodiment) are mounted on the table 3, and a rod head 13 is attached to the tip of the frame-like frame lifting cylinder 12. Are connected. A plurality (four in this embodiment) of suspension rods 14 are suspended from the lower surface of the frame-shaped frame 11. The frame-like frame 11 moves up and down via the suspension rod 14 by the expansion and contraction operation of the frame-like frame elevating cylinder 12. The table 3 is equipped with a clamping device (not shown) for clamping the

pattern carriers

9 and 9A. As a result, the clamp is released at the lower end of the table 3, and when the table 3 is lifted, the

pattern carriers

9, 9A are clamped to the table 3.

Further, an openable / closable cast-in / out conveyor 15 serving as a cast-in / out mechanism for carrying in / out the casting frame W is disposed above the

pattern carriers

9 and 9A inside the support column 6. The cast-in / out conveyor 15 includes an arm 15b whose upper end is rotatably connected to the frame 15a, a roller 15c attached to the tip (lower end) of the arm 15b, and a midway position in the vertical direction of the arm 15b. And a frame mounting member 15d fixed to the frame.

A plurality (four in this embodiment) of positioning pins 16 are fixed to the upper portion of the filling frame mounting member 15d. When the fill frame 17 is placed on the fill frame placing member 15d, the fill frame placing member 15d and the fill frame 17 are positioned by the positioning pins 16.

Further, the casting frame carry-in / out conveyor 15 is suspended from a lifting frame 19 via a hanging member 18, and the lifting frame 19 is moved up and down by a casting frame loading / unloading mechanism lifting cylinder (not shown).

Further, squeeze means 20 is disposed inside the cast-in / out conveyor 15. The squeeze means 20 includes a large number of cylinders (hydraulic cylinders in the present embodiment) 20a, a squeeze foot 20b as a squeeze member connected to the tip of the cylinder 20a, and a support 20c that supports the cylinder 20a. Has been. The support 20c is fixed to the lower center of the upper frame 7.

A pattern carrier elevating means 21 is disposed outside the base 1 and below the pattern carrier 9A. Here, the pattern carrier lifting / lowering means 21 will be described in detail. A pattern carrier elevating cylinder 21b (hydraulic cylinder in this embodiment) is attached to the center upper portion of the gantry 21a, and a driving roller conveyor 21c is connected to the tip of the pattern carrier elevating cylinder 21b. Guide rods 21d are disposed on both outer sides of the pattern carrier elevating cylinder 21b, and the guide rods 21d penetrate the holder 21e mounted on the mount 21a so as to be slidable up and down. The tip of the guide rod 21d is connected to the drive roller conveyor 21c. The drive roller conveyor 21c is equipped with a clamping device (not shown) that clamps the

pattern carriers

9, 9A. Thereby, the clamp is released at the lower end of the drive roller conveyor 21c, and when the drive roller conveyor 21c is raised, the

pattern carriers

9, 9A are clamped on the drive roller conveyor 21c.

When exchanging the

pattern carriers

9 and 9A for another pattern carrier, the casting frame W and the filling frame 17 outside the base 1 are clamped by a clamping means (not shown) attached to a sand hopper 22a described later. . Then, the pattern carrier elevating cylinder 21b is operated so that only the

pattern carriers

9, 9A are brought to a predetermined height. Then, the clamping by the clamping device (not shown) that clamps the

pattern carriers

9 and 9A is released. Then, by operating the drive roller conveyor 21c, the

pattern carriers

9 and 9A on the drive roller conveyor 21c are carried out, and another pattern carrier is carried in.

Further, a sand filling means 22 is disposed on the outside of the base 1 above the casting frame W and the filling frame 17, and the sand filling means 22 is fixed to a support frame 23. Here, the sand filling means 22 will be described in detail. As shown in FIG. 10, an openable louver gate 24 is disposed in the lower interior of a sand hopper 22a for storing the foundry sand S therein, and one end of the openable louver gate 24 is a rotating shaft. A plurality of gate plates 24b fixed to 24a are arranged in the horizontal direction. A release agent spraying means (not shown) is attached to a position between the openable louver gate 24 and the lower surface of the sand hopper 22a on the outer surface of the sand hopper 22a.

A sand supply port opening / closing means 25 is disposed above the sand hopper 22a. Here, the sand supply port opening / closing means 25 will be described in detail. A sand supply port 25b, which is an opening for supplying the foundry sand S into the sand hopper 22a, is provided in a ceiling portion of the casing 25a communicating with the sand hopper 22a. Is provided with a gate member 25c that opens and closes the sand supply port 25b by moving horizontally. An opening / closing cylinder 25d for moving the gate member 25c horizontally is attached to one side surface of the casing 25a, and the gate member 25c is connected to the tip of the opening / closing cylinder 25d.

An air ejection chamber 26 is attached to the inner surface of the sand hopper 22a over the entire circumference, and the air ejection chamber 26 includes a hollow chamber 26a and a porous body disposed at the tip of the hollow chamber 26a. 26b. Note that a switching valve (not shown) communicates with the hollow chamber 26a, and when the switching valve is opened, the compression air is ejected from the porous body 26b through the hollow chamber 26a. In the present embodiment, the porous body 26b is manufactured by sintering ultrahigh molecular weight polyethylene.

An air supply valve 28 is connected to the casing 25a of the sand supply port opening / closing means 25 via a pipe 27, and the air supply valve 28 is connected to a compressed air source (not shown). Reference numeral 29 denotes a sand throwing chute attached to the ceiling of the casing 25a.

The operation of the apparatus configured as described above will be described. FIG. 1 shows that one of two

pattern carriers

9 and 9A, one pattern carrier 9 (hereinafter referred to as a pattern carrier for a lower casting frame) is arranged above the table 3, and the other pattern carrier 9A (hereinafter referred to as an upper casting). (Referred to as a frame pattern carrier) is disposed outside the base 1, and an empty casting frame W and a filling frame 17 are placed on the lower casting frame pattern carrier 9, and the upper casting frame pattern On the carrier 9A, a casting frame W filled with foundry sand S and a filling frame 17 are placed. Examples of the foundry sand S in the present invention include green sand and ceramic artificial sand.

By rotating the turntable 8 in this state, the pattern carrier 9 for the lower casting frame, the empty casting frame W and the filling frame 17 are carried out to the outside of the base 1, and the pattern carrier 9A for the upper casting frame, the casting The casting frame W and the filling frame 17 filled with the sand S are carried over the table 3 to be in the state shown in FIG. Next, by extending the lifting cylinder 2, the upper casting frame pattern carrier 9 A, the casting frame W filled with the casting sand S, and the filling frame 17 are raised through the table 3. Then, by extending the frame-shaped frame elevating cylinder 12, the upper surface of the frame-shaped frame 11 of the upper cast frame pattern carrier 9 A is projected from the parting surface of the pattern plate 10 A (30 mm in this embodiment). .

On the outside of the base 1, the pattern carrier elevating cylinder 21 b is extended to raise the lower casting frame pattern carrier 9, the empty casting frame W, and the filling frame 17. Thereby, the lower surface of the sand hopper 22a is brought into contact with the upper surface of the filling frame 17 carried out to the outside of the base 1, and the pattern plate 10, the empty casting frame W, A molding space is formed by the filling frame 17, and the state shown in FIG. Thereafter, the release agent is sprayed into the molding space by the release agent spraying means (not shown). A stopper member (not shown) for preventing the rising of the filling frame 17 is attached to the lower surface of the upper frame 7. In the state shown in FIG. 3, the upper surface of the filling frame 17 on the base 1 side is in contact with the lower surface of the stopper member. It is touched.

Next, the squeeze foot 20b is lowered by operating a large number of cylinders 20a to primarily squeeze the foundry sand S. Then, the cast-in / out conveyor 15 is closed by an opening / closing means (for example, a cylinder) (not shown) to be in the state shown in FIG.

Next, by elevating the lifting cylinder 2, the pattern plate 10A is lifted until the upper surface of the frame-shaped frame 11 and the parting surface of the pattern plate 10A in the upper cast frame pattern carrier 9A are at the same height. The squeeze foot 20b is further lowered to secondary squeeze the foundry sand S. At this time, the state where the casting frame W and the filling frame 17 are sandwiched between the frame-shaped frame 11 and the stopper member (not shown) is maintained. That is, the frame-shaped frame 11, the casting frame W, and the filling frame 17 do not move in the vertical direction.

On the outside of the base 1, the molding sand S is filled into the molding space by the sand filling means 22. This point will be described in detail. First, the sand supply port 25b is closed by the gate member 25c by extending the opening / closing cylinder 25d of the sand supply port opening / closing means 25. When the switching valve (not shown) is opened, the compression air is ejected from the porous body 26b through the hollow chamber 26a. Then, the plurality of pivot shafts 24a in the openable louver gate 24 are normally rotated by a gate opening / closing cylinder (not shown), and the plurality of gate plates 24b are changed from the horizontal state to the vertical state (louver gate 24 opening). Then, the molding sand S in the sand hopper 22a is filled in the molding space, and the state shown in FIG. 5 is obtained. Note that while the molding sand S is being filled into the molding space, the compressed air is continuously ejected from the porous body 26b, and the compressed air is provided in the vent hole (not shown) provided in the pattern plate 10 or the filling frame 17. The air is exhausted through a vent hole (not shown) provided on the side surface of the main body.

Next, after the pattern plate 10A is lifted in the secondary squeeze, the squeeze foot 20b is further lowered to tertiary squeeze the foundry sand S to the state shown in FIG. On the outside of the base 1, by opening the air supply valve 28, compressed air is caused to flow through the foundry sand S in the molding space to pre-compress the foundry sand S in the molding space (so-called fluidized air). Pre-compression of foundry sand S by pressure). Thereafter, an unillustrated exhaust valve communicated with the casing 25a is opened, and the compressed air remaining in the sand hopper 22a is exhausted.

Next, the pattern plate 10A in the upper cast frame pattern carrier 9A is lowered and removed. At this time, the state where the casting frame W and the filling frame 17 are sandwiched between the frame-shaped frame 11 and the stopper member (not shown) is maintained. That is, the frame-shaped frame 11, the casting frame W, and the filling frame 17 do not move in the vertical direction. For this reason, the pattern plate 10A is lowered by a predetermined height (30 mm in this embodiment), so that the die is removed.

Further, outside the base 1, the pattern carrier elevating cylinder 21 b is contracted to lower the pattern carrier 9 for the lower casting frame, the casting frame W, and the filling frame 17. Thereby, the upper surface of the filling frame 17 and the lower surface of the sand hopper 22a are separated from each other, and the state shown in FIG. 7 is obtained.

Next, the upper casting cylinder pattern carrier 9A, the casting frame W, and the filling frame 17 are lowered by contracting the lifting cylinder 2. Then, the casting frame W is placed on the roller 15c, and the filling frame 17 is placed on the filling frame placing member 15d and positioned by the positioning pins 16. At this time, as the filling frame 17 is lowered, the lower surface of the stopper member (not shown) and the upper surface of the filling frame 17 are separated from each other.

Next, the multiple cylinders 20a are contracted to raise the squeeze foot 20b.
Then, the frame-shaped frame lifting cylinder 12 is contracted at the lower end of the table 3 to lower the frame-shaped frame 11.

On the outside of the base 1, the plurality of pivot shafts 24 a in the openable louver gate 24 are reversely rotated by a gate opening / closing cylinder (not shown), so that the plurality of gate plates 24 b are changed from a vertical state to a horizontal state (louver gate 24 Close). The sand supply port 25b is opened by contracting the open / close cylinder 25d of the sand supply port opening / closing means 25. Thereafter, the foundry sand S is supplied into the sand hopper 22a through the sand supply port 25b by a not-shown foundry sand supply means (for example, a belt feeder), and the state shown in FIG. 8 is obtained.

Next, the cast frame W is carried out by the cast-in / out conveyor 15, and the empty cast frame W is carried into a position between the fill frame 17 and the upper-cast-frame pattern carrier 9A. Then, the cast-frame carry-in / out conveyor 15 is lowered by the above-described cast-frame carry-in / out mechanism lifting cylinder, and the empty cast-frame W and the filling frame 17 are placed on the upper-cast-frame pattern carrier 9A. Thereafter, the cast-in / out conveyor 15 is opened by the opening / closing means (not shown), and the state shown in FIG. 9 is obtained. Next, the cast-frame carry-in / out conveyor 15 is lifted by the cast-frame carry-in / out mechanism elevating cylinder (not shown) to the state shown in FIG. Then, the above operation is repeated.

In the present invention, in the sand hopper 22a provided with the openable louver gate 24, the sand supply port 25b is closed and the sand hopper 22a is sealed, and then compressed from the air ejection chamber 26 attached to the inner surface of the sand hopper 22a. Ayer is erupted. For this reason, sand adhesion to the inner wall surface of the sand hopper 22a can be prevented. Further, since the compressed air is ejected from the air ejection chamber 26 in a state where the upper end of the sand hopper 22a is not opened and the sand hopper 22a is sealed, the consumption of the used air can be reduced. When the openable louver gate 24 is opened, the molding sand S is filled into the molding space. At this time, the molding sand S is preliminarily compressed by the compression air ejected from the air ejection chamber 26. There is also an effect.

In the present invention, the sand filling means 22 is disposed outside the base 1 and the squeeze means 20 is disposed on the base 1 side (specifically, inside the cast-in / out mechanism). There is no need to run the filling means 22 and the squeeze means 20. For this reason, a mechanism for running the sand filling means 22 and the squeeze means 20 is not necessary, and the structure of the apparatus can be simplified.

In the embodiment of the present invention, the pattern carrier (9A in FIG. 1), the casting frame W, and the filling frame 17 are moved up and down by the pattern carrier lifting means 21 on the outside of the base 1, but the present invention is limited to this. Instead, the sand filling means 22 may be raised and lowered without raising and lowering the pattern carrier, the casting frame W and the filling frame 17. In this case, by lowering the sand filling means 22, the lower surface of the sand hopper 22 a is brought into contact with the upper surface of the filling frame 17 carried out of the base 1 to form the molding space. In order to raise and lower the sand filling means 22, for example, a lifting cylinder may be connected to the sand filling means 22.

In the embodiment of the present invention, a large number of squeeze feet 20b are used as the squeeze member. However, the present invention is not limited to this. For example, a single squeeze plate may be used as the squeeze member. . In this case, the number of cylinders for raising and lowering the squeeze plate may be one or more.

Further, in the embodiment of the present invention, the porous body 26b is manufactured by sintering ultrahigh molecular weight polyethylene, but is not limited to this, and the porous body 26b is a plate-like material. Further, a plurality of holes (for example, round holes of φ1 mm to φ2 mm) may be perforated.

Furthermore, in the embodiment of the present invention, the cast-in / out conveyor 15 that can be opened and closed is moved up and down. However, the present invention is not limited to this, and the cast-in / out conveyor 15 does not move up and down. 7 may be fixed. However, when the cast-in / out conveyor 15 is moved up and down as in the embodiment described above, the empty cast-in frame W is loaded onto the rollers 15c of the cast-in / out conveyor 15, and the cast-in frame is immediately loaded. The delivery conveyor 15 can be lowered to place the empty casting frame W and the filling frame 17 on the

pattern carriers

9 and 9A. This is preferable because the cycle time of the mold making apparatus can be shortened.

Furthermore, in the embodiment of the present invention, after the step of filling the molding space with the sand sand S by the sand filling means 22, the air supply valve 28 communicated with the sand filling means 22 is opened, thereby causing the air flow pressurization. Although the pre-compression of the foundry sand S is performed, the pre-compression of the foundry sand S by the air flow pressurization is not essential and may be omitted. However, it is preferable to perform pre-compression of the foundry sand S by air flow pressurization because the filling density of the foundry sand S near the

pattern plates

10 and 10A is improved.

Next, an embodiment different from the above-described embodiment (hereinafter referred to as the first embodiment) will be described as a second embodiment. First, differences in configuration from the first embodiment will be described. In the second embodiment, as shown in FIG. 11, a plurality of filling frame raising and lowering cylinders 101 b are mounted on the lower part of the arm 101 a in the openable and closable casting frame loading and unloading conveyor 101 as the casting frame loading and unloading mechanism. A filling frame placing member 101c is connected to the tip of the filling frame raising / lowering cylinder 101b. A plurality (four in this embodiment) of positioning pins 101d are fixed on the top of the filling frame placing member 101c. When the fill frame 102 is placed on the fill frame placing member 101c, the fill frame placing member 101c and the fill frame 102 are positioned by the positioning pins 101d. The upper end of the arm 101a is rotatably connected to the lower end of the upper frame 7. In the second embodiment, the cast-in / out conveyor 101 does not move up and down.

Further, a plurality of downward cylinders 103 are disposed above both ends of the filling frame 102, and the downward cylinders 103 are attached to the upper frame 7. A head member 104 is connected to the tip of the downward cylinder 103.

Further, squeeze means 105 is disposed inside the cast-in / out conveyor 101. The squeeze means 105 includes a large number of double-rod cylinders (hydraulic cylinders in this embodiment) 105a, a squeeze foot 105b as a squeeze member connected to the tip of the cylinder 105a, and a support 105c that supports the cylinder 105a. And is composed of. The support 105c is fixed to the upper frame 7. Further, as shown in FIG. 21, in the double rod-shaped cylinders 105a, the upper hydraulic chambers 105d are communicated with each other via the upper communication passage 105e, and the lower hydraulic chambers 105f are respectively communicated with the lower communication passage. It communicates via 105g.

Also, above the squeeze means 105, rod height positioning means 106 for determining the height position of the piston rod 105h of the multiple cylinders 105a is disposed. The rod height positioning means 106 includes a positioning member elevating cylinder 106a attached to the upper end of the upper frame 7, and a flat plate positioning member 106b connected to the tip of the positioning member elevating cylinder 106a. Yes. The positioning member 106b and the piston rod 105h are not connected.

Further, at both ends of the filling frame 102, contact members 102a capable of contacting the head member 104 at the tip of the downward cylinder 103 are attached. In the first embodiment, the air ejection chamber 26 on the inner surface of the sand hopper 22a is attached only to the upper side of the openable louver gate 24. In the second embodiment, the air ejection chamber 26 It is attached to the lower side of the openable louver gate 24.

The above points are the differences in configuration from the first embodiment. Other than this, the configuration is the same as that of the first embodiment. In addition, about the same component as 1st Embodiment, it shall show with the same code | symbol and shall abbreviate | omit the description.

The operation of the second embodiment configured as described above will be described. In FIG. 11, one of the two

pattern carriers

9 and 9A, one pattern carrier 9 (hereinafter referred to as a pattern carrier for a lower casting frame) is disposed above the table 3, and the other pattern carrier 9A (hereinafter referred to as an upper casting). (Referred to as a frame pattern carrier) is disposed outside the base 1, and an empty casting frame W and a fill frame 102 are placed on the lower casting frame pattern carrier 9, and the upper casting frame pattern On the carrier 9A, a casting frame W filled with foundry sand S and a filling frame 102 are placed. *

In FIG. 11, all of the multiple cylinders 105a in the squeeze means 105 are stopped at a position that is half the full stroke, that is, at an intermediate position. This point will be described in detail. First, the positioning member 106b is lowered to the lower end by the positioning member elevating cylinder 106a of the rod height positioning means 106. Thereafter, the multiple cylinders 105a are raised until the upper surface of the piston rod 105h contacts the lower surface of the positioning member 106b. In this way, all the many cylinders 105a are stopped at the intermediate position.

By rotating the turntable 8 in this state, the pattern carrier 9 for the lower casting frame, the empty casting frame W and the fill frame 102 are carried out to the outside of the base 1, and the pattern carrier 9A for the upper casting frame, the casting The casting frame W and the filling frame 102 filled with the sand S are carried into the upper part of the table 3 to be in the state shown in FIG. Next, the lifting cylinder 2 is extended to raise the upper casting frame pattern carrier 9A, the casting frame W filled with the casting sand S and the filling frame 102 through the table 3.
Then, by extending the frame-shaped frame elevating cylinder 12, the upper surface of the frame-shaped frame 11 of the upper cast frame pattern carrier 9 A is projected from the parting surface of the pattern plate 10 A (30 mm in this embodiment). . Then, the positioning member elevating cylinder 106a is contracted to raise the positioning member 106b, thereby separating the upper surface of the piston rod 105h from the lower surface of the positioning member 106b.

On the outside of the base 1, the pattern carrier lifting cylinder 21 b is extended to raise the lower casting frame pattern carrier 9, the empty casting frame W, and the fill frame 102. As a result, the lower surface of the sand hopper 22a is brought into contact with the upper surface of the filling frame 102 carried out of the base 1, and the pattern plate 10, the empty casting frame W, A molding space is formed by the fill frame 102, and the state shown in FIG. 13 is obtained. Thereafter, the release agent is sprayed into the molding space by a release agent spraying means (not shown). In the state of FIG. 13, the upper surfaces of the contact members 102 a at both ends of the filling frame 102 on the base 1 side are in contact with the lower surface of the head member 104 at the tip of the downward cylinder 103.

Next, when the lifting cylinder 2 is extended, the upper casting frame pattern carrier 9A, the casting frame W filled with the casting sand S, and the filling frame 102 are further raised through the table 3 so that the casting sand S is primary. Squeeze. Then, the cast-in / out conveyor 101 is closed by an opening / closing means (for example, a cylinder) (not shown), and the state shown in FIG. 14 is obtained.

Next, by extending the lifting cylinder 2, the pattern plate 10A is raised until the upper surface of the frame-shaped frame 11 and the parting surface of the pattern plate 10A in the upper-cast-frame pattern carrier 9A have the same height, and the casting is performed. Secondary squeeze sand S. At this time, the state in which the casting frame W and the fill frame 102 are sandwiched between the frame-shaped frame 11 and the head member 104 is maintained.

On the outside of the base 1, the molding sand S is filled into the molding space by the sand filling means 22. This point will be described in detail. First, the sand supply port 25b is closed by the gate member 25c by extending the opening / closing cylinder 25d of the sand supply port opening / closing means 25. When a switching valve (not shown) is opened, the compression air is ejected from the porous body 26b through the hollow chamber 26a. Then, the plurality of pivot shafts 24a in the openable louver gate 24 are normally rotated by a gate opening / closing cylinder (not shown), and the plurality of gate plates 24b are changed from the horizontal state to the vertical state (louver gate 24 opening). Then, the molding sand S in the sand hopper 22a is filled in the molding space, and the state shown in FIG. 15 is obtained. It should be noted that while the molding sand S is being filled into the molding space, the compressed air is continuously ejected from the porous body 26b, and the compressed air is provided in a vent hole (not shown) provided in the pattern plate 10 or the filling frame 102. The air is exhausted through a vent hole (not shown) provided on the side surface of the main body.

Next, after the lift of the pattern plate 10A in the secondary squeeze is finished, the lifting cylinder 2 is further extended to operate the casting carrier W filled with the pattern carrier 9A for the upper casting frame and the casting sand S via the table 3. Then, the filling frame 102 is further raised to tertiary-squeeze the foundry sand S, and the state shown in FIG. 16 is obtained. On the outside of the base 1, by opening the air supply valve 28, compressed air is caused to flow through the foundry sand S in the molding space to pre-compress the foundry sand S in the molding space (so-called fluidized air). Pre-compression of foundry sand S by pressure). Thereafter, an unillustrated exhaust valve communicated with the casing 25a is opened, and the compressed air remaining in the sand hopper 22a is exhausted.

Next, the pattern plate 10A in the upper cast frame pattern carrier 9A is lowered and removed. At this time, the state in which the casting frame W and the filling frame 102 are sandwiched between the frame-like frame 11 and the head member 104 is maintained, and the frame-like frame 11, the casting frame W, and the filling frame 102 do not move in the vertical direction. . For this reason, the pattern plate 10A is lowered by a predetermined height (30 mm in this embodiment), so that the die is removed.

On the outside of the base 1, the pattern carrier elevating cylinder 21 b is contracted to lower the pattern carrier 9 for the lower casting frame, the casting frame W, and the filling frame 102. Thereby, the upper surface of the filling frame 102 and the lower surface of the sand hopper 22a are separated from each other, and the state shown in FIG. 17 is obtained.

Next, the upper casting frame pattern carrier 9A, the casting frame W, and the filling frame 102 are lowered by contracting the lifting cylinder 2. Then, the casting frame W is placed on the roller 101e. At this time, as the filling frame 102 is lowered, the downward cylinder 103 is also extended. Then, the frame-shaped frame lifting cylinder 12 is contracted at the lower end of the table 3 to lower the frame-shaped frame 11.

On the outside of the base 1, the plurality of pivot shafts 24 a in the openable louver gate 24 are reversely rotated by a gate opening / closing cylinder (not shown), so that the plurality of gate plates 24 b are changed from a vertical state to a horizontal state (louver gate 24 Close). The sand supply port 25b is opened by contracting the open / close cylinder 25d of the sand supply port opening / closing means 25. Thereafter, the foundry sand S is supplied into the sand hopper 22a through the sand supply port 25b by a not-shown foundry sand supply means (for example, a belt feeder) to obtain the state shown in FIG.

Next, by extending the filling frame raising / lowering cylinder 101b, the filling frame 102 is raised through the filling frame placing member 101c and the positioning pins 101d. At this time, as the filling frame 102 is raised, the downward cylinder 103 is also contracted.

Next, all the many cylinders 105a are operated so that the piston rod 105h is lowered, and all the squeeze feet 105b are lowered to the lower end. Thereafter, the positioning member elevating cylinder 106a is extended to lower the positioning member 106b to the lower end. Thereafter, all the multiple cylinders 105a are operated so that the piston rods 105h are raised, and the upper surfaces of all the piston rods 105h are brought into contact with the lower surfaces of the positioning members 106b. In this way, all of the multiple cylinders 105a are stopped at a position that is half the full stroke, that is, at an intermediate position, and the state shown in FIG. 19 is obtained.

Next, the cast frame W is carried out by the cast-in / out conveyor 101, and the empty cast frame W is carried into a position between the filling frame 102 and the upper-cast-frame pattern carrier 9A. Thereafter, the elevating cylinder 2 is extended to place the empty casting frame W on the upper casting frame pattern carrier 9A, and the casting frame W is slightly lifted from the roller 101e. Then, the filling frame raising / lowering cylinder 101b is contracted to lower the filling frame 102 and place it on the empty casting frame W, and the state shown in FIG. 20 is obtained. At this time, as the filling frame 102 is lowered, the downward cylinder 103 is also extended. Further, the positioning of the filling frame placing member 101c and the filling frame 102 by the positioning pins 101d is released.

Next, the cast-in / out conveyor 101 is opened by opening / closing means (not shown). Thereafter, the elevating cylinder 2 is contracted to lower the empty casting frame W and the fill frame 102 to the state shown in FIG. Then, the above operation is repeated.

In the second embodiment, the squeeze means 105 operates as follows during the above-described primary squeeze, secondary squeeze, and tertiary squeeze. As shown in FIG. 22, the oil in the upper hydraulic chamber 105d of the cylinder 105a whose squeeze foot 105b has been quickly pushed upward flows into the upper hydraulic chamber 105d of the cylinder 105a in the vicinity thereof, and the squeeze foot of the cylinder 105a in the vicinity thereof. 105b is pushed down. By performing such an operation, the back surface of the mold can be squeezed with a uniform pressure.

In the second embodiment, oil is supplied to the upper hydraulic chambers 105d of all the cylinders 105a at the time of the tertiary squeeze or after the tertiary squeeze, and the back of the mold is squeezed by the squeeze feet 105b of all the cylinders 105a. You may do it.

Further, the rod height positioning means 106 in the second embodiment described above is configured to raise and lower the flat plate-like positioning member 106b by the positioning member raising / lowering cylinder 106a. However, the present invention is not limited to this. The flat positioning member may be moved horizontally by a traverse cylinder). In this case, for example, a through hole through which each piston rod 105h can pass is formed in the positioning member. Then, the positioning member is connected to the tip of the traversing cylinder so that the positioning member can be moved horizontally. Then, at the extended end of the traverse cylinder, the center of each piston rod 105h coincides with the center of the through hole, and the piston rod 105h can freely pass through the through hole. Further, at the contracted end of the traversing cylinder, the plane of each piston rod 105h is disengaged from the through hole. Therefore, if all the piston rods 105h are lowered and all the piston rods 105h are lifted after the traversing cylinders are contracted, the upper surfaces of all the piston rods 105h are the lower surfaces of the positioning members (places without the through holes). Abut. In this way, as in the second embodiment described above, all of the multiple cylinders 105a can be stopped at a position that is half the full stroke, that is, at an intermediate position.

Furthermore, in the second embodiment of the present invention, the pattern carrier (9A in FIG. 11), the casting frame W, and the filling frame 102 are moved up and down by the pattern carrier lifting means 21 on the outside of the base 1, but this is not limitative. Instead, the sand filling means 22 may be raised and lowered without raising and lowering the pattern carrier, the casting frame W and the filling frame 102. In this case, by lowering the sand filling means 22, the lower surface of the sand hopper 22 a is brought into contact with the upper surface of the filling frame 102 carried out of the base 1 to form the molding space. In order to raise and lower the sand filling means 22, for example, a lifting cylinder may be connected to the sand filling means 22.

Further, in the second embodiment of the present invention, the porous body 26b is manufactured by sintering ultrahigh molecular weight polyethylene, but is not limited to this, and the porous body 26b is a plate. A large number of holes (for example, round holes of φ1 mm to φ2 mm) may be perforated in the material.

Furthermore, in 2nd Embodiment of this invention, although the cast-frame carrying in / out conveyor 101 does not raise / lower, it is not limited to this, You may make it raise this casting-frame carrying in / out conveyor 101. .

Furthermore, in the second embodiment of the present invention, after the step of filling the molding space with the sand sand S by the sand filling means 22, the air supply valve 28 communicated with the sand filling means 22 is opened to open the air flow control. Although the pre-compression of the foundry sand S by the pressure is performed, the pre-compression of the foundry sand S by the air pressure is not essential and may be omitted. However, it is preferable to perform pre-compression of the foundry sand S by air flow pressurization because the filling density of the foundry sand S near the

pattern plates

10 and 10A is improved.

In the first embodiment and the second embodiment of the present invention, in the pre-process of the primary squeeze process on the base 1 side, the upper cast frame pattern carrier 9A, the casting frame W filled with the foundry sand S, and the

fill frame

17 and 102 are raised, the upper surface of the frame-like frame 11 of the upper cast frame pattern carrier 9A is projected from the parting surface of the pattern plate 10A. However, the present invention is not limited to this. After making the upper surface of the frame-shaped frame 11 in the pattern carrier 9A for casting frames project from the parting surface of the pattern plate 10A, the pattern carrier 9A for upper casting frames, the casting frame W filled with foundry sand S, and the

fill frame

17 and 102 may be raised. Further, the process of raising the upper cast frame pattern carrier 9A, the casting frame W filled with the casting sand S and the filling frames 17 and 102, and the upper surface of the frame-like frame 11 in the upper cast frame pattern carrier 9A are arranged on the pattern plate 10A. And the step of projecting from the parting plane may be performed simultaneously.

DESCRIPTION OF SYMBOLS 1 Base 2 Lifting cylinder 3 Table 9 9A Pattern carrier 10 10A Pattern plate 11 Frame-shaped frame 15 101 Cast-frame carrying in / out mechanism 17 102 Filling frame 20 105 Squeeze means 20b 105b Squeeze member 22 Sand filling means 22a Sand hopper 24 Open / close type Louver gate 25 Sand supply port opening / closing means 25b Sand supply port 26 Air ejection chamber 28 Air supply valve S Foundry sand W Casting frame

Claims

After the molding space formed by the pattern plate, casting frame and filling frame placed on the pattern carrier is filled with foundry sand by the sand filling means, the foundry sand filled in the molding space is squeezed by the squeeze means. A mold molding apparatus for molding a mold, wherein the sand filling means is disposed above the casting frame and the filling frame, and has a sand hopper for storing the foundry sand therein, and is disposed inside the sand hopper. An openable and closable louver gate, and a sand supply port opening / closing means that is disposed above the sand hopper and opens and closes a sand supply port that is an opening for supplying the foundry sand into the sand hopper. And an air ejection chamber attached to the inner surface of the sand hopper.
A lifting cylinder mounted on a base, a table connected to the lifting cylinder, a frame on which the pattern plate is placed, and a frame frame that moves up and down surrounding the outer periphery of the pattern plate. The pattern carrier carried in / out above the pattern carrier, a cast-in / out mechanism for carrying in / out the cast frame above the pattern carrier, squeeze means disposed inside the cast-in / out mechanism, and the casting carrier The filling frame disposed above and below the frame and the pattern plate, the casting frame and the filling frame disposed on the outside of the base and carried out from the top of the table to the outside of the base. 2. The mold making apparatus according to claim 1, further comprising: the sand filling means for filling the molding space formed by the step of filling the foundry sand.
3. The mold making apparatus according to claim 1, wherein an air supply valve is communicated with the sand filling means.
After the molding space formed by the pattern plate, casting frame and filling frame placed on the pattern carrier is filled with foundry sand by the sand filling means, the foundry sand filled in the molding space is squeezed by the squeeze means. A mold molding method for molding a mold, the step of filling the molding space with the sand filling means by the sand filling means, the step of closing the sand supply port opening / closing means in the sand filling means, and the sand hopper in the sand filling means A mold making method comprising the steps of ejecting air from an air ejection chamber attached to the inner surface of the mold, and opening an openable louver gate in the sand filling means.
Of the two pattern carriers on which the pattern plate is placed and which has a frame-like frame that surrounds the outer periphery of the pattern plate and moves up and down, one of the pattern carriers is disposed above the table, and the other The pattern carrier is disposed outside the base, and the empty casting frame and filling frame are placed on the one pattern carrier, and the foundry sand is filled on the other pattern carrier. In the state where the casting frame and the filling frame are placed, the one pattern carrier, the empty casting frame and the filling frame are carried out to the outside of the base, and the other pattern carrier and the casting sand are filled. Carrying the cast frame and fill frame above the table, raising the cast frame and fill frame filled with the other pattern carrier, foundry sand, and the other The upper surface of the frame-shaped frame in the turn carrier is made to protrude from the parting surface of the pattern plate, and the lower surface of the sand hopper is brought into contact with the upper surface of the filling frame carried out of the base, Forming a molding space by a pattern plate placed on the one pattern carrier, an empty casting frame and a filling frame; and
The step of lowering the squeeze member in the squeeze means to primarily squeeze the foundry sand, the step of closing the casting frame loading / unloading mechanism, and the upper surface of the frame-shaped frame in the other pattern carrier and the parting surface of the pattern plate are the same The step of lowering the squeeze member while raising the pattern plate until reaching a height to secondary squeeze the foundry sand, the step of filling the molding space with the foundry sand by the sand filling means, and the secondary A step of further lowering the squeeze member to squeeze the foundry sand after the completion of the rising of the pattern plate in squeeze, a step of lowering the pattern plate in the other pattern carrier and removing the mold, and a sand hopper A step of separating from the filling frame carried out to the outside of the base, and the other pattern Open the step of lowering the Yaria, a step of closing the louvers gate openable in the sand filling means, a sand supply port closing means in the sand filling means,
A step of supplying the foundry sand into the sand hopper from a sand supply port, and a step of bringing an empty casting frame into a position between the filling frame disposed above the other pattern carrier and the other pattern carrier. 5. The mold making method according to claim 4, further comprising: placing an empty casting frame and filling frame on the other pattern carrier; and opening the casting frame loading / unloading mechanism.
Of the two pattern carriers on which the pattern plate is placed and which has a frame-like frame that surrounds the outer periphery of the pattern plate and moves up and down, one of the pattern carriers is disposed above the table, and the other The pattern carrier is disposed outside the base, and the empty casting frame and filling frame are placed on the one pattern carrier, and the foundry sand is filled on the other pattern carrier. In the state where the casting frame and the filling frame are placed, the one pattern carrier, the empty casting frame and the filling frame are carried out to the outside of the base, and the other pattern carrier and the casting sand are filled. Carrying the cast frame and fill frame above the table, raising the cast frame and fill frame filled with the other pattern carrier, foundry sand, and the other The upper surface of the frame-shaped frame in the turn carrier is made to protrude from the parting surface of the pattern plate, and the lower surface of the sand hopper is brought into contact with the upper surface of the filling frame carried out of the base, A step of forming a molding space by the pattern plate mounted on the one of the pattern carriers, an empty casting frame and a filling frame, and further raising the casting frame and the filling frame filled with the other pattern carrier and casting sand. The step of first squeezing the foundry sand, the step of closing the casting frame loading / unloading mechanism, the pattern plate until the upper surface of the frame-shaped frame in the other pattern carrier and the parting surface of the pattern plate are at the same height. A step of secondarily squeezing the foundry sand, a step of filling the molding space with the foundry sand by the sand filling means, and a step of squeezing the secondary sand. A step of further squeezing the foundry sand by further raising the other pattern carrier, a casting frame filled with foundry sand and a filling frame, and the pattern plate in the other pattern carrier. A step of lowering and removing the mold, a step of separating the sand hopper from the filling frame carried out of the base, a step of lowering the other pattern carrier, and an openable louver in the sand filling means A step of closing the gate, a step of opening the sand supply port opening / closing means in the sand filling means, and supplying the foundry sand into the sand hopper from the sand supply port, and a filling frame disposed above the other pattern carrier And a step of carrying an empty casting frame between the second pattern carrier and an empty casting frame and fill frame on the other pattern carrier. 5. The mold making method according to claim 4, further comprising a step of placing and a step of opening the cast-in / out mechanism.
After the step of filling the molding space with the sand filling means by the sand filling means, by opening an air supply valve communicated with the sand filling means, the molding sand in the molding space is allowed to flow through the molding sand to cause the molding air to flow. The mold making method according to any one of claims 4 to 6, wherein the foundry sand in the space is pre-compressed.