WO2016103992A1

WO2016103992A1 - Mold manufacturing method and device therefor

Info

Publication number: WO2016103992A1
Application number: PCT/JP2015/082367
Authority: WO
Inventors: 金平　諭三
Original assignee: メタルエンジニアリング株式会社
Priority date: 2014-12-26
Filing date: 2015-11-18
Publication date: 2016-06-30
Also published as: JPWO2016103992A1

Abstract

Provided is a mold manufacturing method with which casting sand filling a difficult-to-fill location can be squeezed uniformly. This mold manufacturing method uses a mold manufacturing device equipped with a squeeze head, a squeeze table, a pattern-fixing board, a casting frame, an upper molding frame (6), a casting sand charging device, multiple squeeze feet (2a) mounted on the squeeze head, and a driving device that brings the squeeze table and the squeeze head into proximity with each other, thereby performing squeezing by means of the multiple squeeze feet. This mold manufacturing method is equipped with: a casting sand charging step, wherein a sand flow restriction member (9) in which hollow holes (9a) are formed, and which restricts the horizontal flow of the casting sand by means of the inner walls of the hollow holes when the casting sand is squeezed by the squeeze feet, is placed inside the upper molding frame, and casting sand is introduced into a combined frame by the casting sand charging device; and a back-surface squeezing step, wherein the squeeze feet are inserted into the hollow holes in the sand flow restriction member arranged in the upper molding frame, and squeezing is performed from the back-surface side.

Description

Mold making method and apparatus

The present invention relates to a mold making method for making a mold having a uniform filling density, and a mold making apparatus used for carrying out the mold making method.

Conventionally, in a mold casting apparatus, a mold that has been squeezed in a well-balanced manner can be formed by placing a model on a model surface plate and uniformly filling the molding sand around the model and squeezing it.

However, in order to increase production efficiency, there are cases where a plurality of models are arranged on one model surface plate. In some cases, the plurality of models are arranged with a small interval between them or with a small interval from the inner wall of the casting frame. It is difficult to fill the casting sand between the model and the model, or between the model and the inner wall of the casting frame, such that the strength of the molded mold is weakened at that part, and the dimensional accuracy of the mold Decrease.

In order to increase the filling of the foundry sand, it is conceivable to increase the pressure of the squeeze head when squeezing, but when squeezing, the foundry sand is not only squeezed but also squeezed. Diffuses laterally (laterally). Therefore, by the high pressure of the squeeze head, the casting sand is solidified by applying a force in the lateral direction until the casting sand reaches a narrow space such as between the models, and the sand is sufficiently placed in the narrow space. There was a problem that could not be filled.

As these measures, in Patent Document 1, the thin plate bodies 9A and 9B erected in the squeeze direction on the mounting plate instead of the squeeze head were filled between the model and the inner wall of the casting frame and inside the model. It is described that the foundry sand S is pre-compressed.

In Patent Document 2, a split-type squeeze foot is used, and after pre-squeezing the whole under the same pressure force condition, a squeeze foot that faces a difficult-to-fill point that is difficult to be filled with foundry sand, It is described that the squeeze is preliminarily squeezed from the foot. First, the hardness of the entire foundry sand is increased by the preliminary squeeze, and in this state, the pre-squeeze squeeze foot that projects the squeeze foot facing the difficult-to-fill location is projected, so the dispersion of the pressure generated by the projected squeeze foot is preliminarily The precast filling squeeze pressure is transmitted to the deep part of the difficult-to-fill part, and the mold strength at the difficult-to-fill part can be increased.

In Patent Document 3, a plurality of grids 7 crossing the cross shape are formed on the upper part of the opening of the mold 6 (casting frame), and a squeeze member 14 (squeeze foot) enters the opening formed by the grid 7 and casts sand. The squeeze is described.

JP-A-9-10892 JP 2004-50251 A Japanese Patent Publication No. 35-7054

However, in Patent Document 1, after a thin plate body is inserted into foundry sand and pre-compressed, the thin plate body is extracted from the foundry sand and squeezed by a separate squeeze head. Increase production efficiency. Further, it is necessary to change the shape of the thin plate body depending on the shape of the model and the arrangement of the model, and there is a problem that the production efficiency is lowered due to the increase in cost due to the increase in equipment and the replacement process.

In Patent Literature 2, there is a problem that the control valve is required for each divided squeeze foot, thereby increasing the equipment cost and complicating the equipment structure, resulting in complicated maintenance work. .

In Patent Document 3, since the lattice is fixed to the mold, it is very troublesome to remove the mold from the mold after pouring into the molded mold. Moreover, a hot water receptacle cannot be provided in the part provided with the lattice. The mold is cleaned with a brush, but brush cleaning of the inner surface of the mold may cause scraping or the like due to the lattice.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a mold making method capable of reducing equipment cost and uniformly squeezing foundry sand filled in difficult-to-fill places. And a mold making apparatus used in the molding method.

The structural features of the present invention include a squeeze head that squeezes the foundry sand, a squeeze table that moves relative to the squeeze head along a molding path, and a model that is fixed to the upper surface and attached to the squeeze table. A model surface plate, a casting frame that forms a molding space filled with foundry sand together with the model surface plate, an upper frame that is superposed on the upper end of the casting frame to form a polymerization frame together with the casting frame, A foundry sand throwing device for throwing cast sand into the superposition frame, a plurality of squeeze feet that are mounted on the squeeze head and are relatively movable along the molding path direction with respect to the squeeze table; and Squeeze the foundry sand put into the superposition frame with the squeeze table and the squeeze head relatively close to each other with the plurality of squeeze feet. A mold making method using a mold making device comprising a moving device, wherein a hollow hole having an open top and bottom is formed so that the squeeze foot can be inserted and removed, and the squeeze foot When squeezing the foundry sand, a sand flow restricting member for restricting the lateral flow of the foundry sand to be squeezed by the inner wall of the hollow hole is provided in the upper frame, and the superposition frame is formed by the foundry sand charging device. A casting sand feeding step for casting sand into the casting sand, and the driving device is driven to insert the squeeze foot into the hollow hole of the sand flow regulating member disposed in the upper frame, And a back side squeeze step of squeezing from the back side of the model.

According to the present invention, when squeezing the back side with the squeeze foot, the foundry sand is squeezed with the squeeze foot inserted into the hollow hole of the sand flow regulating member disposed in the foundry sand of the upper frame. The foundry sand pressed by the squeeze foot is guided by the inner wall of the hollow hole of the sand flow restricting member, moves exclusively in the squeeze direction, and is restricted from diffusing in the lateral direction in the squeeze direction. Therefore, the squeeze pressure due to the squeeze foot is transmitted to the deep part of the difficult-to-fill area without the casting sand being squeezed by diffusion to the side, and the entire mold to be molded can be squeezed uniformly. As a result, a mold having high strength and high dimensional accuracy can be formed.

1 is an overall schematic diagram showing a first embodiment of a mold making apparatus of the present invention. It is a partially expanded view which shows the squeeze state of a mold making apparatus. It is a block diagram which shows the outline | summary of a control apparatus. It is a top view of the upper frame and sand flow regulating member used in the first embodiment. It is a figure which shows the VV cross section in FIG. It is a figure which shows the state positioned after squeeze position, after casting sand was thrown in. It is a figure which shows a back side squeeze process. It is a figure which shows a demolding process. It is a top view which shows the molded casting_mold | template. It is a figure which shows the XX cross section in FIG. It is a flowchart which shows a squeeze procedure. It is a figure which shows the test conditions for comparing the intensity | strength of the casting_mold | template shape | molded with the casting_mold | molding apparatus of this invention, and the conventional casting mold apparatus. It is the graph which compared the intensity | strength of the casting_mold | template shape | molded on the test conditions of FIG. It is a top view which shows the upper frame and sand flow control member which are used in 2nd Embodiment. It is XV-XV sectional drawing in FIG. It is a plane which shows the casting_mold | template shape | molded with the sand flow control member of 2nd Embodiment. It is XVII-XVII sectional drawing in FIG. It is a top view which shows the upper frame and sand flow control member which are used in 3rd Embodiment. It is a schematic diagram which shows the mold making apparatus of 4th Embodiment. It is a figure which shows the squeeze process of the mold making apparatus of 4th Embodiment. It is a schematic diagram which shows the mold making apparatus of 5th Embodiment. It is a top view which shows the upper frame and sand flow control member which are used in 5th Embodiment. It is a schematic diagram of the squeeze head used in 5th Embodiment. It is a figure which shows the squeeze process of the mold making apparatus of 5th Embodiment. It is a figure which shows the outline | summary of the squeeze head and sand flow control member which are used for the mold making apparatus of 6th Embodiment. It is a figure which shows the process of having inserted the sand flow control member in 6th Embodiment in the foundry sand in the overlay frame. It is a figure which shows the squeeze process of the mold making apparatus of 6th Embodiment.

(First embodiment)
A first embodiment of a mold making apparatus using the mold making method according to the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the mold making apparatus 1 includes a squeeze head 2 for squeezing the foundry sand S (see FIG. 2), and a squeeze table 3 (see FIG. The charging device 7 is opposed to the squeeze table 3.), the model surface plate 4 on which the model M is fixed on the upper surface, and the casting frame 5 that forms the molding space MS (see FIG. 2) together with the model surface plate 4. The upper frame 6 overlaid on the upper end of the casting frame 5, the casting sand feeding device 7 for feeding the casting sand S into the molding space MS, a plurality of squeeze feet 2a mounted on the squeeze head 2, and a squeeze table 3 and the squeeze head 2 are driven relatively close to each other, a sand flow restricting member 9 that restricts the lateral flow of the squeezed foundry sand S, the foundry sand throwing device 7, the drive device 8 and the like. A control device C for controlling It is provided.

The squeeze head 2 and the foundry sand throwing device 7 are juxtaposed with a shuttle device 10 provided on the upper part of the mold making device 1.
The shuttle device 10 includes a shuttle cylinder 10a and a piston portion 10b. The distal end portion of the piston portion 10b is connected to a support member 13 supported by the casing so as to be movable in the horizontal direction by a guide device (not shown). On the lower surface of the support member 13, the squeeze head 2 and the foundry sand throwing device 7 are fixed side by side in the horizontal direction. The shuttle cylinder 10 a is communicated with a hydraulic pump 15 as a hydraulic source, and an electromagnetic switching valve 14 is provided between the shuttle cylinder 10 a and the hydraulic pump 15. The operation of the electromagnetic switching valve 14 is controlled by the control device C. The electromagnetic switching valve 14 communicates with the hydraulic pump 15 in the right chamber of the shuttle cylinder 10a to retract the piston portion 10b, and communicates with the hydraulic pump 15 in the left chamber of the shuttle cylinder 10a to advance the piston portion 10b. It has a left position 14L and a central position 14C that puts the piston portion 10b in a stopped state. The foundry sand throwing device 7 and the squeeze head 2 are switched by the shuttle device 10 so that the electromagnetic switching valve 14 is switched to the left position 14L, the sand supply position where the foundry sand throwing device 7 is opposed to the squeeze table 3, and the electromagnetic switching valve 14. Is switched to the right position 14R, and the squeeze head 2 is positioned at the squeeze position where the squeeze head 2 faces the squeeze table 3.

A plurality of squeeze feet 2 a are mounted on the squeeze head 2 so as to be able to advance and retreat independently in the molding route direction toward the squeeze table 3. The squeeze foot 2a has a foot piston 2d and a pressure head 2e. A plurality of foot cylinders 2c are formed in the head body 2b of the squeeze head 2, and a foot piston 2d of the squeeze foot 2a having a pressure head 2e at the lower end is slidably fitted to each foot cylinder 2c. And stored. The squeeze foot 2a is arranged over the entire inner side of the casting frame 5, and squeezes the foundry sand S put into the casting frame 5 evenly. As shown in FIG. 1, the upper chambers of all the foot cylinders 2 c are connected to the left chamber of the cylinder 22. The right chamber of the cylinder 22 is communicated with a hydraulic pump 26 via an electromagnetic switching valve 23. The electromagnetic switching valve 23 has a left position 23L that allows the right chamber of the cylinder 22 and the hydraulic pump 26 to communicate with each other, and a right position 23R that allows the right chamber of the cylinder 22 to communicate with the drain. The switching operation of the electromagnetic switching valve 23 is controlled by the control device C. All the squeeze feet 2a are respectively driven by foot cylinders 2c arranged in parallel in the hydraulic circuit so that an equal pressure is generated in all the squeeze feet 2a.

The foundry sand throwing device 7 includes a shutter (not shown) composed of a plurality of bottom plates at the lower end of the container body 7a for storing the foundry sand S. The shutter is rotated about the horizontal axis by a rotation device 84 whose drive is controlled by the control device C based on the detection value of the rotation position detection sensor 83 (see FIG. 3). When the bottom plate of the shutter is rotated to the horizontal state, the foundry sand S is stored, and when the bottom plate is rotated to the vertical state, the foundry sand S is dropped. When indexed to the sand supply position by the shuttle device 10, the casting sand throwing device 7 faces the polymerized casting frame 5 and the overlay frame 6, and the molding sand S measured by a hopper (not shown) is polymerized. It is put into the frame 56 (see FIG. 2).

The squeeze table 3 is formed in a rectangular shape when viewed from above, and is provided in a lower cylinder device 31 fixed to the device main body 1a. The lower cylinder device 31 has a piston part 31a and a cylinder part 31b. The squeeze table 3 is fixed to the upper end of the piston portion 31a and is advanced and retracted in the vertical direction. The upper part and the lower part of the cylinder part 31b communicate with the hydraulic pump 36 via an oil supply pipe. The supply of hydraulic pressure from the hydraulic pump 36 is switched by an electromagnetic switching valve 33 provided between the hydraulic pump 36 and the cylinder portion 31b. A pressure sensor 37 is provided between the electromagnetic switching valve 33 and the cylinder portion 31b. A detection signal from the pressure sensor 37 is sent to the control device C. The electromagnetic switching valve 33 includes a right position 33R in which the lower part of the cylinder part 31b communicates with the hydraulic pump 36 to advance the piston part 31a, and a left position in which the upper part of the cylinder part 31b communicates with the hydraulic pump 36 and moves the piston part 31a backward. It has a position 33L and a central position 33C where the piston portion 31a is stopped. The operation of the electromagnetic switching valve 33 is controlled by the control device C. By driving the lower cylinder device 31, the squeeze table 3 is configured to advance and retract relative to the squeeze head 2 along the molding path. The lower cylinder device 31, the hydraulic pump 36 and the electromagnetic switching valve 33 constitute a drive device 8.

Further, when performing a back side squeeze which will be described later, the back side squeeze section is configured by the control device C that drives the drive unit 8. As shown in FIG. 3, the control device C includes a calculation unit C <b> 1, a storage unit C <b> 2, and a control unit C <b> 3, and detects the pressure value detected by the pressure sensor 37 and the relative position of the squeeze head 2 with respect to the squeeze table 3. By operating the

electromagnetic switching valves

23 and 33 based on the sensor 81 and the like, the driving of the cylinder 22, the squeeze foot 2a, the lower cylinder device 31 and the like is controlled.

On the squeeze table 3, a master plate 41 having a model surface plate 4 which is a square plate fixed to the upper surface is detachably mounted. A model M is attached to the upper surface of the model surface plate 4.
The casting frame 5 corresponds to the outer shape of the model surface plate 4 and is formed in a square shape capable of enclosing the casting sand S to be charged from the side surface side. The casting frame 5 is filled with the foundry sand S while being placed on the master plate 41, thereby forming a molding space MS (see FIG. 2) for forming the mold ML together with the model surface plate 4.

The upper frame 6 is superposed on the upper end of the cast frame 5, and the superposed frame 56 is constituted by the cast frame 5 and the upper frame 6 (see FIG. 2). As shown in FIG. 4, the upper frame 6 is formed in a square shape corresponding to the shape of the cast frame 5. The casting sand S to be poured into the casting frame 5 is thrown in as much as the casting sand 6 placed on the casting frame 5 and is poured into the casting frame 5 (casting sand in the molding space MS). S) Larger volume. A casting mold in which the volume of the casting sand S that has been put into the upper frame 6 is pressurized by a squeeze that will be described later, so that the volume of the casting sand S that has been put into the casting frame 5 is compressed. Mold ML.

As shown in FIGS. 4 and 5, a sand flow regulating member 9 is provided inside the upper frame 6.
The sand flow restricting member 9 is formed in a rectangular lattice shape from a rectangular outer frame member 9b and a plurality of thin plates 9c extending in parallel to the outer frame member 9b inside the outer frame member 9b and intersecting each other in a cross shape. And a grid-like portion 9d formed. A plurality of rectangular hollow holes 9a having upper and lower openings are formed in the lattice portion 9d by dividing the lattice portion 9d. The hollow holes 9a are provided corresponding to the plurality of squeeze feet 2a, respectively.

The outer frame member 9b is fixed to the inner wall of the upper frame 6 with a plurality of bolts 9b1. As shown in FIG. 2, the lattice-shaped portion 9 d is formed such that the length KL (height) in the width direction of the thin plate 9 c is longer than the height UL of the upper frame 6. The grid-like portion 9 d is configured such that when the upper frame 6 is superimposed on the casting frame 5, the lower end portion of the thin plate 9 c enters the upper part of the casting frame 5 with a predetermined length. The height KL of the thin plate 9c is, for example, from the length SML from the upper end portion of the upper frame 6 to the upper end portion of the model M embedded in the foundry sand S so as to ensure the strength of the mold ML to be molded. The length obtained by subtracting MT can be set.

The lower end of the grid portion 9d is formed in a tapered shape in which each hollow hole 9a becomes wider downward. Thus, since each hollow hole 9a becomes wider downward, the lower taper part 9c1 is formed so that the lower part of the thin plate 9c constituting the lattice-like part 9d becomes thinner downward as shown in FIG. Has been. An upper taper portion 9c2 is also formed on the upper portion of the thin plate 9c so that the thickness decreases upward. A tapered notch 9d1 is provided in a lower portion of the lattice-shaped portion 9d facing the upper end portion of the casting frame 5. This taper-shaped notch 9d1 prevents the lattice-shaped portion 9d from coming into contact with the upper end portion of the casting frame 5 when the sand flow regulating member 9 is overlaid on the casting frame 5 together with the upper frame 6, and is removed from the mold. The grid-like portion 9d can be easily extracted from the foundry sand S that has become the mold ML.

As shown in FIGS. 4 and 5, mounting brackets 6 a are provided at the four corners of the upper frame 6 so as to protrude in a direction in which a pair of opposing frames extend. Supporting holes 6a1 into which a later-described upper frame support member 61 can be inserted are respectively provided in the mounting bracket 6a.

Further, as shown in FIG. 1, a master plate exchanging device 32 is arranged above the squeeze table 3 described above. The master plate exchanging device 32 includes a pair of roller support members 32a1 provided in the apparatus main body 1a and extending in parallel to each other, and a plurality of rollers 32a2 that are rotatably supported facing the inside of the roller support members 32a1. A lower roller conveyor 32a is provided.

The master plate 41 is positioned on the lower roller conveyor 32a at an exchange position facing the squeeze table 3 by a stop device (not shown). The master plate 41 is detachably transferred from the lower roller conveyor 32a onto the squeeze table 3 raised by the lower cylinder device 31.

A casting frame delivery device 51 is disposed above the master plate exchange device 32. The cast frame delivery device 51 has a pair of upper roller conveyors 51a extending in the horizontal direction (a direction parallel to the lower roller conveyor 32a) in a state of being separated from each other. The upper roller conveyor 51a includes a pair of roller support members 51a1 extending in parallel with each other and a plurality of rollers 51a2 that are rotatably supported facing the inner side of the roller support member 51a1. By the upper roller conveyor 51a, the lower surfaces on both sides of the casting frame 5 are detachably supported above the master plate exchanging device 32. On the upper roller conveyor 51a, the casting frames 5 used for molding are arranged in order. Next, the cast frame 5 to be cast is positioned on the upper roller conveyor 51a at a cast frame delivery position facing the squeeze table 3 by a stop device (not shown).

When the squeeze table 3 is raised by the lower cylinder device 31, the upper surface of the master plate 41 placed on the squeeze table 3 is at a height position that coincides with the upper end of the roller 51a2 of the upper roller conveyor 51a. As the squeeze table 3 further rises from this height position, the casting frame 5 is transferred from the upper roller conveyor 51a onto the master plate 41.

On the upper surface of the cast frame delivery device 51, four upper frame support members 61 are provided so as to protrude above the upper portions of the roller support members 51a1. The upper frame support member 61 is configured such that the upper frame 6 is supported from below by mounting brackets 6a provided at four corners. These upper frame support members 61 are arranged so that the upper frame 6 is positioned at a position facing the squeeze table 3. The upper frame support member 61 is a bar material provided with a rod-shaped support member main body portion 61a and a rod-shaped guide portion 61b that is thinner than the support member main body portion 61a at the tip of the support member main body portion 61a. The guide portions 61b are detachably fitted in the support holes 6a1 (see FIG. 4) of the mounting bracket 6a provided at the four corners of the lower surface of the upper frame 6. The support member body 61a is formed such that the height of the casting frame 5 and the length from the lower end of the upper frame 6 to the lower end of the mounting bracket 6a are longer than the combined length, and the upper surface of the casting frame 5 and the upper frame The upper frame 6 is supported with a gap between the lower surface of 6. The upper frame 6 placed on the cast frame 5 is supported above the cast frame 5 by the upper frame support member 61.
As the squeeze table 3 is raised by the lower cylinder device 31, the master plate 41 (model surface plate 4) and the casting frame 5 are placed on the squeeze table 3. When the squeeze table 3 is further raised, a superposed frame 56 is formed in which the upper frame 6 is superimposed on the cast frame 5 from the upper frame support member 61 (see FIG. 2).

Next, a molding procedure using the mold molding apparatus 1 configured as described above will be described below based on FIG. 1, FIG. 6, FIG. 7, FIG.
As shown in FIG. 1, the master plate 41 to which the model M and the model surface plate 4 are assembled is positioned at an exchange position (a position facing the squeeze table 3) of the master plate exchange device 32. The squeeze table 3 is disposed at a descending end below the master plate exchanging device 32. The upper frame 6 is supported by the upper frame support member 61 with a gap above the position of the upper end portion of the casting frame 5. As described above, the sand flow regulating member 9 is assembled and fixed inside the opening of the upper frame 6. In the cast frame delivery device 51, a plurality of cast frames 5 are arranged on the upper roller conveyor 51a.

First, the control device C positions the casting frame 5 used for molding at a casting frame delivery position (a position facing the squeeze table 3) (step 101; hereinafter, step is abbreviated as “S” and S101). As described.)

Next, the control device C switches the electromagnetic switching valve 33 to the right position 33R to communicate the hydraulic pump 36 with the lower portion of the cylinder portion 31b. As a result, the piston portion 31a of the lower cylinder device 31 moves forward to raise the squeeze table 3. The squeeze table 3 receives the casting frame 5 from the casting frame delivery device 51 in the middle of ascending, and places the casting frame 5 on the master plate 41.

The control device C further raises the squeeze table 3 and receives the upper frame 6 from the upper frame support member 61. At that time, the upper frame 6 is held at a position slightly above the upper end of the support member main body 61a in a state where the support hole 6a1 is fitted in the guide 61b. And the control apparatus C forms the superposition | polymerization frame 56 by superimposing the upper frame 6 on the casting frame 5 which rose with the squeeze table 3 (S102). When the control device C determines that the overlapping frame 56 has been formed based on the detection signal of the position sensor 81 that detects the position of the casting frame 5, the control device C switches the electromagnetic switching valve 33 to the central position 33C to raise the squeeze table 3. Stop.

Next, the control device C drives the shuttle cylinder 10a of the shuttle device 10 to position the foundry sand throwing device 7 at the sand throwing position (position facing the squeeze table 3) (S103). This step may be performed before the polymerization frame forming step, or may be performed in parallel with the polymerization frame forming step.

Next, the control device C drives the rotating device of the container body 7a, rotates the shutter, and converts the foundry sand S, which has been measured by the hopper (not shown), into an amount required for forming the mold ML. 56 (S104, foundry sand charging step). The lattice portion 9d of the sand flow restricting member 9 fixed to the inner side of the upper frame 6 is provided with an upper taper portion 9c2 on the upper portion of the thin plate 9c. Due to the upper taper portion 9c2, when the foundry sand S is charged, the foundry sand S is loaded on the upper end portion of the thin plate 9c or is repelled by the upper end portion of the thin plate 9c so that the foundry sand S is separated from the grid-like portion 9d. It is possible to prevent diffusion to the position.

Next, the control device C drives the shuttle cylinder 10a of the shuttle device 10 to position the squeeze head 2 at the squeeze position (position facing the squeeze table 3) (S105).

Next, the control device C raises the squeeze table 3 to a position where squeeze by the squeeze head 2 is possible by switching the electromagnetic switching valve 33 to the right position 33R and driving the lower cylinder device 31 (see FIG. 6). ).
At this time, the control device C positions the electromagnetic switching valve 23 at the right position 23R (a position where the right chamber in FIG. 1 of the cylinder 22 communicates with the drain) so that the squeeze foot 2a can move backward.
And the front-end | tip of the pressurization head 2e contacts the upper end surface of the foundry sand S piled on the upper frame 6, and the squeeze foot 2a retracts in the foot cylinder 2c as the squeeze table 3 rises. The pressure oil from the foot cylinder 2c flows into the space on the left chamber side of the cylinder 22, and the piston of the cylinder 22 also moves backward.

When the piston of the cylinder 22 comes into contact with the moving end on the right side and the retreat of the piston stops, hydraulic pressure as a reaction force from the cylinder 22 is generated in the foot cylinder 2c.

Control device C further raises squeeze table 3 (see FIG. 7). As a result, the squeeze foot 2a and the squeeze table 3 approach each other, and the casting sand S in the superposition frame 56 is squeezed on the back side by the squeeze foot 2a (S106, back side squeeze step). During the backside squeeze, the squeeze foot 2 a is inserted into the hollow hole 9 a of the sand flow regulating member 9. The sand flow restricting member 9 restricts the squeezed foundry sand S from being laterally diffused with respect to the squeeze direction (vertical direction), thereby causing a flow of the foundry sand S oriented in the squeeze direction. Thereby, it is possible to uniformly fill the foundry sand S in difficult filling places such as between the model M and the model M and between the model M and the inner wall of the casting frame 5. Each squeeze foot 2a is squeezed with the same pressure, but the model M is disposed in the casting sand S and the casting sand S is shallow in the portion where the depth is shallow, and the model M is not disposed. It is deep in the place where the depth of the foundry sand S is deep, and the descending position of the squeeze foot 2a is different (see FIG. 7).

The pressure from the squeeze table 3 used for the back side squeeze is detected by a pressure sensor 37 provided between the lower cylinder device 31 and the electromagnetic switching valve 33, and a detection signal is sent to the control device C. When the control device C determines that the predetermined pressure has been reached based on the detection signal of the pressure sensor 37, the control device C switches the electromagnetic switching valve 33 to the center position 33C and stops the squeeze table 3 from rising.

Next, the control device C switches the electromagnetic switching valve 33 to the left position 33L, makes the hydraulic pump 36 communicate with the upper part of the cylinder portion 31b, and lowers the squeeze table 3. The polymerization of the casting frame 5 and the upper frame 6 is released, the master plate 41 is removed from the casting frame 5 and the mold ML is removed (S107, FIG. 8). Since the thin plate 9c of the lattice-like portion 9d is provided with the lower taper portion 9c1 that becomes thinner downward, the upper frame 6 can be easily removed from the casting frame 5 without breaking the casting sand S on the surface of the mold ML. be able to. The outer (upper) surface of the removed mold ML is uneven as shown in FIG. 8 depending on the depths pressed by the squeeze feet 2a.

Next, the surplus portion where the irregularities are formed on the outside of the mold ML is deleted (S108). For example, the surplus convex part which protruded from the end surface of the casting frame 5 is provided by the scraper device which is provided with a blade extending horizontally on the conveying line of the mold ML and moves relatively in parallel to the upper end surface of the casting frame 5. delete. As a result, as shown in FIGS. 9 and 10, a mold ML is formed in which the end face coincides with the end face of the casting frame 5 and the grooves S1 are formed in a lattice shape on the outer surface of the mold ML.

Next, the control device C determines whether or not production is finished (S109). If it is determined that the production is not finished, the process returns to S101 and the molding procedure is repeated. When it is determined that the production is finished, the molding procedure is finished.

Further, the strength of the molded mold is obtained when the mold is formed using the present mold making apparatus using the sand flow restricting member 9 and when the mold is formed using the conventional mold making apparatus not using the sand flow restricting member 9. A comparative test was performed.
As a model used in this test, three types of cylindrical models were prepared as shown in FIG. The cylindrical model is a model M1 having a height of 120 mm and an inner diameter of 80 mm, a model M2 having a height of 60 mm and an inner diameter of 40 mm, and a model M3 having a height of 40 mm and an inner diameter of 40 mm. As for the squeeze conditions, the pressure heads 2e of the plurality of squeeze feet 2a are pressed to a depth DP of about two-thirds of the height KL of the thin plate 9c of the sand flow regulating member 9. The distance between the lower end of the sand flow regulating member 9 and the upper end of the model was 50 mm for the model M1, 110 mm for the model M2, and 130 mm for the model M3. The mold making by the conventional mold making apparatus is different only in that the sand flow regulating member 9 is not used, and the other conditions are the same.
As shown in FIG. 13, the mold strength is 4.8 (N / cm ² ) for the model M1 and 4.5 (N / cm ² ) for the model M2 when the mold is molded using a conventional mold making apparatus. ) And model M3, it was 4.0 (N / cm ² ). On the other hand, in the case of mold making using the present mold making apparatus, the model M1 is 8.2 (N / cm ² ), the model M2 is 7.9 (N / cm ² ), and the model M3 is 5.5 ( N / cm ² ). In particular, an increase in mold strength of 170% was observed in the high model M1 where it is considered that difficult-to-fill places are likely to occur, and a 176% increase in mold strength was observed in the medium height model M2. In this way, the mold making by the present mold making apparatus 1 using the sand flow regulating member 9 can uniformly fill the foundry sand S even when using a model in which difficult filling places in squeeze are likely to occur, It was revealed by actual tests that a high-strength mold could be made.

As is apparent from the above description, the mold making apparatus 1 in the first embodiment includes a squeeze head 2 that squeezes the foundry sand S, and a squeeze table that moves forward and backward relative to the squeeze head 2 along the molding path. 3, a model surface plate 4 fixed to the upper surface of the model M and attached to the squeeze table 3, a casting frame 5 that forms a molding space filled with the casting sand S together with the model surface plate 4, and an upper end portion of the casting frame 5 The upper frame 6 that forms a polymerization frame 56 together with the casting frame 5, the casting sand loading device 7 that loads the casting sand S into the polymerization frame 56, and the squeeze table 3 mounted on the squeeze head 2. A plurality of squeeze feet 2a that can advance and retreat in the molding path direction and a casting sand S that has been put into the superposition frame 56 are moved closer to each other by bringing the squeeze table 3 and the squeeze head 2 closer to each other. A drive device 8 that performs squeezing with the squeeze 2a, and a hollow hole 9a that is disposed in the upper frame 6 and that is open at the top and bottom so that the squeeze foot 2a can be inserted and removed is formed. The sand flow restricting member 9 that restricts the lateral flow of the squeezed foundry sand S by the inner wall of the hollow hole 9a and the squeeze foot 2a are arranged in the upper frame 6 by driving the driving device 8. And a back side squeeze part (control device C) for inserting the foundry sand S from the back side of the model M into the hollow hole 9a of the sand flow regulating member 9 thus formed.

According to this, when squeezing the back side with the squeeze foot 2a, the foundry sand is inserted with the squeeze foot 2a inserted into the hollow hole 9a of the sand flow regulating member 9 disposed in the foundry sand S of the upper frame 6. Squeeze S. The foundry sand S pressed by the squeeze foot 2a is guided by the inner wall of the hollow hole 9a of the sand flow restricting member 9, and moves exclusively in the squeeze direction and is restricted from diffusing in the side surface direction in the squeeze direction. Therefore, it is possible to squeeze deeply into a difficult-to-fill part without adding the sand flow restricting member 9 having a simple structure to the side where the foundry sand S diffuses to the side and the sand S is tamped. The squeeze pressure by the foot 2a is transmitted, and the entire mold ML to be molded can be squeezed uniformly. This eliminates the need to provide a pressure control valve for each squeeze cylinder as in the prior art, making it possible to mold the mold ML with high strength and dimensional accuracy by reducing the equipment cost as much as possible.

Further, the sand flow regulating member 9 is fixed to the upper frame 6.
According to this, the sand flow regulating member 9 is fixed to the upper frame 6 in advance, so that the sand flow regulating member 9 is arranged in the upper frame 6 and the upper frame 6 is overlapped with the casting frame 5 at the same time. Since the sand flow restricting member 9 is disposed in 56, the step of disposing the sand flow restricting member 9 can be omitted. In addition, when removing the mold, removing the upper frame 6 from the casting frame 5 simultaneously removes the sand flow regulating member 9 from the mold, so that the mold ML can be removed from the casting frame 5 very easily. . Since the sand flow restricting member 9 is not attached to the casting frame 5, the casting frame 5 can be easily and reliably cleaned.

The sand flow restricting member 9 has a rectangular lattice shape when viewed from the molding path direction.
According to this, the sand flow regulating member 9 corresponding to the squeeze foot 2a can be easily formed by assembling in a square lattice shape.

The sand flow regulating member 9 is provided with a hollow hole 9a corresponding to each squeeze foot 2a.
According to this, the sand flow restricting member 9 finely divides the casting sand S to be squeezed for each squeeze foot 2a to correspond to difficultly filled portions. Therefore, even if there are a plurality of difficult-to-fill places in the foundry sand S, the applied pressure of the squeeze foot 2a can be reliably transmitted to the deep portions of the respective difficult-to-fill parts to perform uniform squeeze. it can.

Moreover, the hollow hole 9a of the sand flow restricting member 9 is provided in a tapered shape that becomes wider downward.
According to this, since the hollow hole 9a has a taper shape that becomes wider downward, the lower end portion of the sand flow regulating member 9 is formed in a taper shape (lower taper portion 9c1) that becomes thinner downward. Therefore, even if the foundry sand S is hardened by squeeze, the lower end portion is the lower tapered portion 9c1, so that the peelability is improved, so that the sand flow regulating member 9 can be easily extracted from the foundry sand S. Thereby, it is possible to remove the mold ML safely and reliably without breaking the mold ML.

In the above embodiment, all the squeeze feet 2a are assumed to generate a uniform applied pressure. However, the present invention is not limited to this. For example, a control valve is provided for each foot cylinder, and different pressures are used for each foot cylinder. May be added.
Moreover, although the squeeze of the foundry sand S is a back side squeeze, the present invention is not limited to this. (Squeeze from below so that the model surface plate moves relative to the foundry sand in the superposition frame) By filling the foundry sand around the model surface, the backside squeeze may be performed.

(Second Embodiment)
Next, a second embodiment of the mold making apparatus according to the present invention will be described below with reference to FIGS.
The sand flow restricting member 209 used in the second embodiment is a thin plate 9c2a at a position where the hot water receiving port 211 (see FIGS. 16 and 17) of the mold ML2 is formed (the center position in the rightmost row of the lattice in FIG. 14). The height KL2 is provided to be the same as the height UL of the upper frame 6, and when the upper frame 6 is overlapped with the casting frame 5, the lower end portion of the lattice portion 9d2 enters the upper part of the casting frame 5. There is no provision. The leftmost thin plate 9c2b of the grid portion 9d2 is provided with a height higher than the other thin plates 9c, and the lower end portion of the grid portion 9d2 enters more into the upper part of the casting frame 5. Since these points are different from those of the first embodiment and the other configurations are the same, the same reference numerals are given and description thereof is omitted.

When the squeeze is executed using the sand flow restricting member 209 in the second embodiment, the groove S1 is not formed at the position where the hot water receiving port 211 of the mold ML2 is formed, and therefore the hot water receiving port 211 is affected by the groove S1. It can be reliably molded without any problems.

Further, in the cast frame 5 to which the leftmost thin plate 9c2b of the grid portion 9d2 corresponds, the space between the model M and the inner wall of the cast frame 5 is narrow, and it is difficult to fill the foundry sand S with difficulty. (See FIG. 17). However, the thin plate 9c2b in the leftmost row of the lattice portion 9d2 is formed to have a high height, and enters the upper part of the casting frame 5 more than the lower end portion of the other thin plate 9c of the lattice portion 9d2. Therefore, the distance by which the foundry sand S is directed in the squeeze direction by the inner wall of the lattice-shaped portion 9d2 becomes longer, and the lateral diffusion to the deep position of the foundry sand S can be restricted. As a result, even in a difficult-to-fill portion of the foundry sand S in which the space between the model M and the inner wall of the casting frame 5 is narrow, the foundry sand S can be uniformly filled to form a mold ML2 having a uniform strength. it can. Thus, uniform squeeze can be performed more efficiently by forming the portion of the sand flow restricting member 209 corresponding to the difficult filling portion high.

As is clear from the above description, the sand flow restricting member 209 in the second embodiment has a portion of the lower end of the sand flow restricting member 209 corresponding to the location where the hot water receiving port 211 is provided.
According to this, even if the sand flow restricting member 209 is fixed to the upper frame 6, the portion of the sand flow restricting member 209 corresponding to the place where the hot water receiving port 211 is provided is removed. can do.

(Third embodiment)
Next, a third embodiment of the mold making apparatus according to the present invention will be described below with reference to FIG.
The sand flow regulating member 309 used in the third embodiment is provided with an inner frame member 9e along the outer frame member 9b on the inner side with an interval in which one squeeze foot 2a can be inserted from the outer frame member 9b. ing. Between the outer frame member 9b and the inner frame member 9e, at the left and right ends in FIG. 18, there are three partitions 9f at intervals at which two squeeze feet 2a can be inserted along the outer frame member 9b. It is erected. At the upper and lower ends in FIG. 18, the partitions 9f are installed at one place at intervals at which the three squeeze feet 2a can be inserted along the outer frame member 9b. As a result, four hollow holes 9a2 into which the two squeeze feet 2a can be inserted side by side are provided in the left-right direction (in FIG. 16), and the hollow holes 9a3 into which the three squeeze feet 2a can be inserted side by side are Two locations are provided in each direction (in FIG. 18).

Since these points are different from the first embodiment and the other configurations are the same, the same reference numerals are given and the description thereof is omitted.
The position close to the inner wall of the casting frame 5 may be a difficult filling portion where the casting sand S is difficult to be filled due to a narrow space between the inner wall and the model M. In the sand flow regulating member 309 of the third embodiment, hollow holes 9a2 and 9a3 are provided between the outer frame member 9b and the inner frame member 9e, and the hollow holes 9a2 and 9a3 approach the inner wall of the casting frame 5, respectively. Corresponds to the position. Therefore, the flow of the foundry sand S during squeeze diffuses in the lateral direction by the partition 9f, the inner frame member 9e, and the outer frame member 9b of the sand flow regulating member 309 constituting the hollow holes 9a2 and 9a3. To regulate.
Thereby, even if the space between the inner wall of the casting frame 5 and the model M becomes narrow, the casting sand S can be uniformly filled and squeezed uniformly, and a mold ML having high strength and dimensional accuracy is formed. be able to. Since the sand flow restricting member 309 is only provided along the inner wall of the casting frame 5, the sand flow restricting member 309 can have a simple structure, and the manufacturing cost can be reduced. Moreover, the sand flow restricting member 309 having a simpler structure can be obtained by forming the hollow hole 9a2 into which two squeeze feet 2a can be inserted side by side and the hollow hole 9a3 into which three squeeze feet 2a can be inserted side by side. it can.

As apparent from the above description, the sand flow restricting member 309 in the third embodiment corresponds to the squeeze foot 2a in which the hollow holes 9a2 and 9a3 of the sand flow restricting member 309 are arranged on the outer peripheral side among the plurality of squeeze feet 2a. The hollow holes 9a2 and 9a3 are provided such that a plurality of squeeze feet 2a in the outer squeeze foot 2a can be inserted.

According to this, the sand sand restricting member 309 arranged on the outer peripheral side prevents the foundry sand S to be squeezed from being squeezed by diffusing laterally (laterally) with respect to the squeeze direction. Therefore, the applied pressure of the squeeze foot 2a can be efficiently transmitted to the space narrowed between the inner wall of the casting frame 5 and the model M, and uniform squeeze can be performed as a whole. Since each of the hollow holes 9a2 and 9a3 can be inserted with a plurality of squeeze feet 2a in the outer squeeze foot 2a, the sand flow regulating member 309 can have a simple structure, and the manufacturing cost can be reduced.

(Fourth embodiment)
Next, a fourth embodiment of the mold making apparatus according to the present invention will be described below with reference to FIGS.
The mold making apparatus 401 of the fourth embodiment is different from the first embodiment in that a plurality of squeeze feet 2a are fixed to the head body 402b in the squeeze head 402.

In the case of the mold making apparatus 401 of the fourth embodiment, as described above, the squeeze foot 2a is fixed so as not to move in the vertical direction. Therefore, when the squeeze table 3 is raised and the back side squeeze is performed, as shown in FIG. 20, the depth at which each squeeze foot 2 a is pushed into the foundry sand S is the same.

In the case of the mold making apparatus 401 of the fourth embodiment, it is effective when the height of the model M arranged in the casting frame 5 is low and there is not much difference in the reaction force generated from the foundry sand S against each squeeze foot 2a. It is. Further, the squeeze head 402 can have a simple structure, and the equipment cost can be reduced.
About another structure and an effect | action, it is the same as that of 1st Embodiment, attaches | subjects the same code | symbol and abbreviate | omits description.

(Fifth embodiment)
Next, a fifth embodiment of the mold making apparatus according to the present invention will be described below with reference to FIGS.
The mold making apparatus 501 in the fifth embodiment has an integrated squeeze head 502 and foundry sand throwing apparatus 507. The foundry sand throwing device 507 is provided with a blowing and filling device 507a that applies air pressure to the foundry sand S when thrown into the casting frame 5. At the upper four corners of the upper frame 506, support ribs 506a are projected in the horizontal direction, and at the four corners of the squeeze head 502 facing the support ribs 506a, a pressing cylinder device 52 provided with pistons 52a that advance and retract in the vertical direction. Is provided.
The upper frame 506 has a plurality of inner wall surface slits (not shown) provided in parallel to each other along the horizontal direction of the inner wall surface. A first air hole that allows the wall surface slit to communicate with outside air is provided. Each inner wall surface slit has a groove width set to 0.3 mm, for example, so that particles of the molding sand S cannot pass therethrough and air can pass therethrough. The inner wall slit and the first vent hole form a first vent hole for discharging the compressed air blown by the blow filling device 507a to the outside air.
The lower end surface of the pressure head 2e1 of the squeeze foot 2a1 has a plurality of parallel slits (not shown) provided in parallel along one direction of the lower end surface, and each parallel slit has an upper portion of the pressure head 2e1. A second ventilation hole is provided to open and communicate the parallel slit with the outside air. Each parallel slit has, for example, a groove width of 0.3 mm, and particles of the molding sand S cannot pass therethrough and air can pass therethrough. The parallel slit and the second vent hole form a second vent hole for discharging the compressed air blown by the blow filling device 507a to the outside air together with the first vent hole.
The sand flow restricting member 509 is not provided with a partition 9f at a position corresponding to a foundry sand supply hole 510 described later. These points are different from the first embodiment.

The above differences will be described in detail below. The casting sand throwing device 507 includes a storage main body 507c formed in a cylindrical shape having a square cross section, a top 508a extending in the horizontal direction (the front-rear direction in FIG. 21) at the inner central portion of the storage main body 507c, and the top And a partition wall 508 having a pair of inclined surfaces 508b that spread and branch downward downward like a roof, and a hanging surface 508c that continues to the inclined surface 508b and hangs down to the lower end of the storage body 507c. .

The squeeze head 502 is assembled in the lower part of the storage main body 507c. As shown in FIG. 23, the squeeze head 502 is formed in a rectangular frame shape, and a bridge portion 502a extending at a predetermined width is provided between one opposing side. An opening 502b is provided between the bridge portion 502a and the other opposite side, and a base end portion of a foundry sand supply hole 510 constituted by a storage main body portion 507c and a suspended surface 508c is fitted into the opening portion 502b. Are assembled. The squeeze head 502 is assembled to the storage main body 507c and fixed to each other by welding, for example. A plurality of foot cylinders 2c of a squeeze foot 2a1 are formed in the bridge portion 502a. The configuration of the hydraulic circuit that supplies pressure oil to the foot cylinder 2c and the foot cylinder 2c is the same as that of the first embodiment.

A pressing cylinder device 52 having pistons 52a that move up and down in the vertical direction is provided at the four corners of the squeeze head 502. The tip of the piston 52 a is configured to abut on support ribs 506 a provided at the upper four corners of the upper frame 506. The pressing cylinder device 52 communicates with a hydraulic pump (not shown), and an electromagnetic switching valve for a pressing cylinder device (not shown) is provided between the pressing cylinder device 52 and the hydraulic pump. The operation of the electromagnetic switching valve for the pressing cylinder device is controlled by the control device C.

A partition wall 508 is disposed above the bridge portion 502a. The partition wall 508 partitions the space in which the foundry sand S is stored and the space in which the squeeze head 502 is disposed in the storage main body portion 507c. A casting sand supply hole 510 extending in a groove shape along the horizontal direction and opening downward is provided between the hanging surface 508c that forms a pair of the partition walls 508 and the inner wall of the storage main body 507c. It has been. An edge member 510a is provided at the opening of the foundry sand supply hole 510 over the periphery of the opening, and the edge member 510a contacts the inner wall of the upper frame 506 and the sand flow regulating member 509 during squeeze described later. And it is comprised so that it may slide relatively smoothly.

The upper part of the storage main body 507c is provided with an opening, and the opening is provided with a lid 507d capable of opening and closing the opening and sealing. A plurality of air supply pipes 507e that open to the inside are provided in the upper part of the inner wall of the storage main body 507c, and the air supply pipe 507e communicates with an air pump 511 that supplies compressed air. An electromagnetic switching valve 512 that opens and closes the air supply pipe 507e is provided between the air pump 511 and the opening. The electromagnetic switching valve 512 has an upper position 512U where the opening of the air supply pipe 507e communicates with the air pump 511, and a lower position 512D where the opening of the air supply pipe 507e is closed. The operation of the electromagnetic switching valve 512 is controlled by the control device C. The air supply pipe 507e, the air pump 511, and the electromagnetic switching valve 512 constitute a blowing and filling device 507a. A superposition frame 556 is formed by superposition of the upper frame 506 and the casting frame 5.

As shown in FIG. 22, the sand flow restricting member 509 has a partition 9f omitted in a portion into which a foundry sand supply hole 510 formed by the suspended surface 508c and the inner wall of the storage main body 507c is inserted during squeezing. Thus, a rectangular opening 509a is provided.
About another structure, it is the same as that of 1st Embodiment, the same code | symbol is provided and description is abbreviate | omitted.

Next, a casting sand charging process and a squeeze process using the mold making apparatus 501 configured as described above will be described below with reference to FIGS.
As shown in FIG. 21, in the casting sand charging step, as a premise, the casting frame 5 and the upper frame 506 are overlaid on the master plate 41 placed on the squeeze table 3. The squeeze table 3 is raised by the control device C, and a part of the lower end portion of the foundry sand throwing device 507 enters the upper end portion of the upper frame 506.

The control device C switches an electromagnetic switching valve for a pressing cylinder (not shown) to allow a hydraulic pump (not shown) to communicate with the upper part of the cylinder portion of the pressing cylinder device 52. As a result, the piston 52a of the pressing cylinder device 52 moves forward, and the lower end of the piston 52a is brought into contact with the upper surface of the support rib 506a of the upper frame 506. As a result, the rising of the upper frame 506 is prevented.
The control device C supplies the foundry sand S, which is conveyed by a conveyor device (not shown) and measured by a hopper (not shown), into the storage main body portion 507c from the opening portion where the lid body 507d is opened.
The control device C closes the lid 507d and switches the electromagnetic switching valve 512 to the upper position 512U (position where the air pump 511 and the air supply pipe 507e communicate with each other) in FIG. And the control apparatus C injects compressed air into the storage main-body part 507c from the air supply pipe 507e, thereby fluidizing the foundry sand S and increasing the air pressure in the storage main-body part 507c. As a result, the foundry sand S is uniformly filled in the space formed by the casting frame 5, the upper frame 506 and the model surface plate 4. The sand flow restricting member 509 is fixed to the upper opening of the upper frame 506. However, since the cast sand S to be introduced is fluidized, the sand flow restricting member 509 does not block the introduction and enters the space. The foundry sand S is filled evenly. The compressed air blown into the storage main body 507c from the air supply pipe 507e is released to the outside air through the first vent hole and the second vent hole.

In the squeeze step, as shown in FIG. 24, the squeeze table 3 and the squeeze head 502 are brought close to each other by raising the squeeze table 3 by the control device C, as in the first embodiment, and the back side squeeze is executed. To do. During the rear side squeeze, the control device C switches the pressing cylinder electromagnetic switching valve (not shown) to a position where the upper part of the cylinder portion of the pressing cylinder device 52 communicates with the drain, and the piston 52a of the pressing cylinder device 52 is switched. Retractable state.
In the fifth embodiment, the casting sand supply hole 510 (edge member 510a) disposed on the inner wall side of the upper frame 506 and the casting frame 5 also presses the molding sand S from the back side to squeeze the back side. Is made. Other operations are the same as those in the first embodiment, and a description thereof will be omitted.

As is apparent from the above description, in the mold making apparatus 501 according to the fifth embodiment, the foundry sand injection apparatus 507 is formed by compressed air with the upper frame 506 on which the sand flow regulating member 509 is disposed and the casting frame 5. The blow filling device 507a blows and fills the foundry sand S into the superposed frame 556.
According to this, since the foundry sand S is fluidized and filled by the blowing and filling device 507a, even if the sand flow regulating member 509 is provided in the polymerization frame 556, the foundry sand S can be reliably placed in the polymerization frame 556. It can be filled evenly.

(Sixth embodiment)
Next, a sixth embodiment of the mold making apparatus according to the present invention will be described below with reference to FIGS.
In the mold making apparatus 601 of the sixth embodiment, the sand flow restricting member 609 is not fixed to the upper frame 6, and the single squeeze foot 602 a and the sand flow restricting member 609 corresponding to the squeeze foot 602 a are integrally connected. ing. Then, after the foundry sand S is put into the superposition frame 56, the sand flow restricting member 609 is inserted into the difficult filling portion in the upper frame 6, and the auxiliary squeeze is executed by the squeeze foot 602a. These points are different from the first embodiment.

The above differences will be described in detail below.
In the sixth embodiment, the connected body of the sand flow restricting member 609 and the squeeze head 602 includes a carriage 602b movable in the plane direction with respect to the apparatus main body 601a, and a cylindrical sand flow restricting member provided below the carriage 602b. 609 and a squeeze foot 602a inserted inside the cylindrical shape of the sand flow restricting member 609.

The carriage 602b is assembled with, for example, a free wheel (not shown) that can move vertically and horizontally along a horizontal plane, and the free wheel is driven by, for example, a motor (not shown). The motor that drives the universal wheel is controlled by the control device C, and the control device C arbitrarily moves the carriage 602b and specifies the position of movement by a position sensor (not shown) for positioning.

The carriage 602b is provided with a pair of cylindrical guide members 602c that penetrate the carriage 602b in the vertical direction and are provided in parallel with each other. Guide rods 602d are slidably inserted in the guide member 602c. The upper ends of the paired guide rods 602d are connected and fixed to both ends of the horizontal member 602e. Connected to the lower surface of the central portion of the horizontal member 602e is a piston distal end portion of an elevating cylinder 602f whose base end portion is fixed to the upper surface of the carriage 602b. The lower end portion of the guide rod 602d is connected to both end portions of the horizontally mounted squeeze head 602. A cylindrical sand flow restricting member 609 projects downward from the center of the lower surface side of the squeeze head 602. The cylindrical inner side of the sand flow regulating member 609 constitutes the hollow hole 609a. A foot cylinder 602g is provided at the center of the upper surface side of the squeeze head 602, and a piston portion (squeeze foot 602a) that advances and retreats downward is provided through the squeeze head 602. The pressure head 2e of the squeeze foot 602a is configured to be inserted into the hollow hole 609a of the sand flow regulating member 609.

An auxiliary squeeze process using the sand flow restricting member 609 and the squeeze head 602 configured as described above will be described below with reference to FIGS.
The control device C moves the carriage 602b to position the sand flow regulating member 609 at the upper position of the difficult-to-fill location (see FIG. 25).
The control device C drives the elevating cylinder 602f to retract the piston, and moves the squeeze head 602 downward. As a result, the control device C inserts the sand flow regulating member 609 into the foundry sand S put into the upper frame 6 as shown in FIG.

Next, as shown in FIG. 27, the control device C drives the foot cylinder 602g to advance the squeeze foot 2a. The pressure head 2e moves in the hollow hole 609a and performs auxiliary squeeze from the back side.
The control device C drives the foot cylinder 602g to retract the squeeze foot 2a, drives the lift cylinder 602f to advance the piston, and moves the squeeze head 602 upward. As a result, a cavity H is formed in the upper part of the foundry sand S.
After the auxiliary squeeze from the rear side has been completed, the foundry sand S in the superposition frame 56 is replenished with the foundry sand S into the cavity H formed by the auxiliary squeeze by a not-shown cast sand replenishing device, and then a normal mold making apparatus. Squeeze the foundry sand S at the back side.
According to this, the auxiliary squeeze is performed in advance in a difficult filling portion where it is difficult to fill the foundry sand S and the foundry sand S is replenished, and then the main squeeze is performed, so that the mold ML uniformly squeezed as a whole is surely formed. can do.

The sand flow regulating member 9 of the first embodiment is provided with a hollow hole 9a corresponding to each squeeze foot 2a, and the sand flow regulating member 309 in the third embodiment is two of the squeeze foot 2a located on the outer peripheral side. Although the hollow holes 9a2 and 9a3 that can be inserted in groups of 3 or 3 are used, the present invention is not limited to these. For example, a hollow hole can be provided corresponding to a difficult-to-fill part of the foundry sand S, such as providing a hollow hole corresponding to the squeeze foot located on the outer peripheral side and a hollow hole corresponding to the squeeze foot located on the center side. .
Thus, the specific configuration described in the above-described embodiment is merely an example of the present invention, and the present invention is not limited to such a specific configuration. Various embodiments can be adopted without departing from the scope.

It can be used in fields that require a mold making device that uniformly squeezes the foundry sand filled in difficult-to-fill places at low cost.

DESCRIPTION OF SYMBOLS 1 ... Mold making apparatus, 2 ... Squeeze head, 2a ... Squeeze foot, 3 ... Squeeze table, 4 ... Model surface plate, 5 ... Casting frame, 56 ... Superposition frame, 6 ... Overlay frame, 7 ... Casting sand injection device, DESCRIPTION OF SYMBOLS 8 ... Drive apparatus, 9 ... Sand flow control member, 9a ... Hollow hole, 9a2, 9a3 ... Hollow hole, 209 ... Sand flow control member, 309 ... Sand flow control member, 401 ... Mold making apparatus, 501 ... Mold making apparatus, 506 ... Top Filling frame, 507 ... casting sand injection device, 507a ... injection filling device, 509 ... sand flow regulating member, 556 ... polymerization frame, 601 ... mold molding device, 609 ... sand flow regulating member, C ... control device (back side squeeze part), M ... model, ML ... mold, ML2 ... mold, S ... foundry sand.

Claims

A squeeze head for squeezing foundry sand;
A squeeze table that moves forward and backward relative to the squeeze head along the molding path;
A model surface plate on which the model is fixed to the upper surface and attached to the squeeze table;
A casting frame that forms a molding space filled with foundry sand together with the model surface plate;
An upper frame that is superposed on the upper end of the casting frame to form a polymerization frame together with the casting frame;
Foundry sand throwing device for throwing foundry sand into the polymerization frame;
A plurality of squeeze feet that are mounted on the squeeze head and are capable of moving forward and backward relative to the squeeze table along the molding path direction;
A driving device for squeezing the casting sand put in the superposition frame with the plurality of squeeze feet by relatively approaching the squeeze table and the squeeze head;
A mold making method for making a mold using a mold making apparatus comprising:
A hollow hole having an upper and lower opening is formed so that the squeeze foot can be inserted and removed, and when the foundry sand is squeezed by the squeeze foot, the lateral flow of the foundry sand squeezed is the inner wall of the hollow hole. A sand flow regulating member regulated by
Foundry sand charging step of casting sand into the polymerization frame by the foundry sand charging device,
A back side squeeze step in which the drive device is driven to insert the squeeze foot into the hollow hole of the sand flow restricting member disposed in the upper frame and squeeze the foundry sand from the back side of the model. And a mold making method.
A squeeze head for squeezing foundry sand;
A squeeze table that moves forward and backward relative to the squeeze head along the molding path;
A model surface plate on which the model is fixed to the upper surface and attached to the squeeze table;
A casting frame that forms a molding space filled with foundry sand together with the model surface plate;
An upper frame that is superposed on the upper end of the casting frame to form a polymerization frame together with the casting frame;
Foundry sand throwing device for throwing cast sand into the polymerization frame;
A plurality of squeeze feet that are mounted on the squeeze head and are movable forward and backward in the molding path direction with respect to the squeeze table;
A driving device for squeezing the casting sand put in the superposition frame with the plurality of squeeze feet by relatively approaching the squeeze table and the squeeze head;
A lateral direction of the foundry sand to be squeezed when the foundry sand is squeezed by the squeeze foot, which is disposed in the upper frame and is formed with a hollow hole whose top and bottom are opened so that the squeeze foot can be inserted and removed. A sand flow regulating member for regulating the flow to the inner wall of the hollow hole,
A back side squeeze portion that drives the driving device to insert the squeeze foot into the hollow hole of the sand flow restricting member arranged in the upper frame and squeezes the foundry sand from the back side of the model. And a mold making apparatus.
The mold making apparatus according to claim 2, wherein the sand flow restricting member is fixed to the overlay frame.
4. The mold making apparatus according to claim 2, wherein the sand flow restricting member has a rectangular lattice shape when viewed from the molding path direction.
The mold making apparatus according to any one of claims 2 to 4, wherein the sand flow regulating member is provided with the hollow hole corresponding to each squeeze foot.
The hollow hole of the sand flow restricting member is arranged corresponding to a squeeze foot arranged on the outer peripheral side among the plurality of squeeze feet, and each hollow hole has a plurality of squeeze feet in the outer squeeze foot. 5. The mold making apparatus according to claim 2, wherein the mold making apparatus is insertable.
The mold making apparatus according to any one of claims 2 to 6, wherein the hollow hole of the sand flow restricting member is provided in a tapered shape that widens downward.
4. The mold making apparatus according to claim 3, wherein the sand flow restricting member is formed by removing a part of a lower end portion of the sand flow restricting member corresponding to a place where the hot water receiving port is provided.
The mold molding apparatus according to any one of claims 2 to 8, wherein the foundry sand charging device is a blow filling device that blows and fills cast sand into the polymerization frame in which the sand flow regulating member is arranged by compressed air. apparatus.