JP2003103345A - Frameless mold forming machine and pattern plate used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frameless mold forming machine capable of easily manufacturing a frameless mold provided with a desired shape, adequate tightening strength, hardness, etc. SOLUTION: A pattern plate 30, whose surface is formed integrally with a mold 28, forming respectively a molding space 32 in each forms 10, 12 by being held and positioned between two forms 10, 12 held buttedly each other, is constituted by sticking a plurality of plate materials 46, 48, and an air discharge path 50 opening on the side face thereof is formed inside the pattern plate 30 by providing a groove extending to the peripheral part and opening in the side direction in the peripheral part on the sticking face to the other plate material 46 in at least one plate material 46 out of the plurality of the plate material 46,48, and a vent hole 54 communicating the air discharge path 50 and the molding space 32 each formed with an opening is formed on the pattern plate 30 and/or the mold 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frameless type mold making machine having no formwork and a pattern plate used therefor, and in particular, by blowing and filling molding sand into a molding space and compacting it. The present invention relates to an improved structure of a frameless type mold making machine for producing a frameless type mold making machine and a pattern plate suitably used for such a frameless type mold making machine.

[0002]

2. Description of the Related Art Conventionally, as a type of mold making machine, two molds having a cylindrical frame shape are sandwiched between pattern plates having a model integrally provided on the surface, and the respective molds are formed. One of the openings is abutted so as to be closed by the pattern plate, and the squeeze plate is fitted into the other opening of each of the molds in a state of being held, and the squeeze plate is predetermined in each of the molds While forming the molding space of, respectively, through each of the molding space, through the sand supply port provided in one of the facing portions of the peripheral wall of each mold,
While blow-filling the molding sand with compressed air, discharging the compressed air from a vent hole provided on the other side of the facing portion, and further compacting the molding sand filled in each molding space with a squeeze plate. There is known a frameless mold making machine configured to mold a pair of frameless molds.

By the way, in such a frameless mold making machine, the fluidity of the molding sand in the molding space is increased by the air pressure of the compressed air blown into the molding space from the sand supply port together with the molding sand. Although the molding sand is filled in the molding space, compressed air is simply put from the sand supply ports provided at the opposite portions of the peripheral wall of each mold toward the vent holes. For example, the casting sand is only allowed to flow in the direction parallel to the pattern plate positioned so as to close one opening of each mold, so that the molding sand in the direction parallel to the pattern plate. However, the fluidity of the molding sand in the direction toward the pattern plate could not be improved.

Therefore, in such a conventional frameless mold making machine, for example, in a peripheral portion of a model integrally formed with a pattern plate, a corner portion formed between the surface of the pattern plate and the surface of the model, When the corners of the mold or the surface of the model are provided with recesses, insufficient filling of the molding sand occurs at the corners of the recesses, etc. However, there are inherent problems such as difficulty in molding, and insufficient compaction strength and hardness of the molded mold.

Under such circumstances, in Japanese Patent Laid-Open No. 4-200956, etc., in addition to the vent holes provided in the peripheral wall of each mold, both sides in the thickness direction exposed in the molding space of the pattern plate are disclosed. And a side surface exposed to the outside of the molding space, a frameless mold molding machine in which a vent hole for opening the molding space to the atmosphere is provided in the pattern plate is disclosed. In this frameless mold making machine, the compressed air blown from the sand supply port is discharged to the outside through the vent holes provided in the peripheral wall portion of each mold and the pattern plate,
Such compressed air is caused to flow in both directions parallel to the pattern plate and toward the pattern plate, whereby the fluidity of the foundry sand in those directions can be advantageously enhanced. is there. Therefore, in the frameless mold making machine disclosed in such publication, the molding sand may be sufficiently filled in the peripheral corners of the model integrally formed on the pattern plate and the corners in the recesses formed in the model. Therefore, the target frameless mold is
It is possible to mold with a desired shape, sufficient compaction strength, hardness and the like.

However, in such a frameless mold making machine, the vent hole provided in the pattern plate is perforated so that it bends at a right angle inside the pattern plate made of one plate material. Therefore, it is not easy to form such a vent hole in the pattern plate, and the pattern plate is
The manufacturability is remarkably inferior, and therefore, it is difficult to say that a frameless mold having a desired shape, sufficient compaction strength, hardness, etc. can be easily manufactured. Of.

[0007]

The present invention has been made in view of the circumstances as described above, and the first problem to be solved is that the compressed air blown into the molding space is discharged to the outside. Since the pattern plate configured so that it can be manufactured has a structure capable of realizing excellent manufacturability, a frameless mold having a desired shape, sufficient compaction strength, hardness, etc. can be easily manufactured. An object of the present invention is to provide a frameless mold making machine which is designed to be obtained. Further, in the present invention, it is a second problem to be solved to provide a pattern plate that is advantageously used in such a frameless mold making machine.

[0008]

According to the present invention, in order to solve the first problem, a pattern plate having a model integrally provided on the surface of two molds having a tubular frame shape is provided. Sandwiching them between them, and abutting them so that one opening of each of the molds is closed by the pattern plate, and holding the squeeze plate in the other opening of each mold. Thus, a predetermined molding space is formed in each of the molds, and further, one of the facing portions of the peripheral wall of each mold is provided with a sand supply port for supplying foundry sand, and the other of the facing portions is vented. A hole is provided, and while each of the molding spaces is blown and filled with molding sand through the sand supply port together with compressed air, the compressed air is discharged from the vent hole while the molding sand filled in each molding space is filled. The above In a frameless mold making machine configured to mold a pair of frameless molds by compacting with an ised plate, the pattern plate is configured to have a structure in which a plurality of plate materials are bonded together, and In at least one plate member of the plate member, a bonding surface with a plate member different from that, by providing a groove that extends continuously toward the peripheral edge portion and opens laterally at the peripheral edge portion, An exhaust passage is formed inside the pattern plate, extending continuously toward the side surface of the pattern plate, and opening on the side surface to the outside of the molding space, and further penetrating the plate material, and opening portions at both ends thereof. In the above, the pattern plate and / or the model provided on the pattern plate are provided with ventilation holes respectively opening to the exhaust passage and the molding space. Form, the free frame type mold molding machine, characterized by being configured, it is an gist thereof.

In short, in the frameless mold making machine according to the present invention, an exhaust passage extending inside the pattern plate toward the side surface of the pattern plate and opening to the outside of the molding space is formed at the side surface. On the other hand, since at least one of the pattern plate and the model provided therein is provided with ventilation holes that open to the molding space and the exhaust passage, respectively, the exhaust passage and the ventilation hole are In the above, the compressed air blown into the molding space from the sand supply port is configured as a vent hole for discharging the compressed air to the outside, and the compressed air is formed by the vent hole provided in the peripheral wall portion of each mold and the pattern plate. The gas is discharged to the outside of the molding space through a vent hole provided in the and a vent hole formed of an exhaust passage. And thereby, the compressed air blown into the molding space is allowed to flow smoothly not only in the direction parallel to the pattern plate but also in the direction toward the pattern plate, and together with the compressed air from the sand supply port into the molding space. The flowability of the foundry sand supplied can also be advantageously increased both in the direction parallel to the pattern plate and in the direction toward the pattern plate, and as a result, the peripheral corners of the model integrally formed with the pattern plate. Thus, the molding sand can be sufficiently and uniformly filled in the molding space, including the corners of the concave portion formed in the model.

Further, in the frameless mold making machine according to the present invention, the pattern plate is formed by laminating a plurality of plate materials, and at least one of the plurality of plate materials is different from that. The exhaust passage is formed inside the pattern plate by providing a groove on the laminating surface of the pattern plate, the groove extending continuously toward the peripheral edge and opening laterally at the peripheral edge.
The vent hole so as to communicate with such an exhaust passage and the molding space, penetrates the plate material providing the pattern plate,
Since the vent hole formed by the exhaust passage and the vent hole is formed in the pattern plate by being provided, for example, a hole bent at a right angle in the inside of one plate material. By providing the portion, the arrangement structure of the vent holes in the pattern plate can be extremely advantageously simplified as compared with the case where the vent holes are provided.

Therefore, in the frameless mold making machine according to the present invention, as compared with the conventional frameless mold making machine having a pattern plate made of one plate material in which a bent vent hole is formed. Therefore, the manufacturability of the pattern plate can be effectively enhanced.

Therefore, in such a frameless mold making machine according to the present invention, the molding sand is blown into the molding space together with the molding sand so that the fluidity of the molding sand in the direction toward the pattern plate can be advantageously enhanced. The pattern plate, which is configured with vent holes that discharge compressed air to the outside, can have a structure that can achieve excellent manufacturability, which allows the desired shape, sufficient compaction strength, hardness, etc. It is possible to easily manufacture a frameless mold having

Further, in the frameless mold making machine according to the present invention, since the pattern plate has a structure in which a plurality of plate materials are bonded together, the strain resistance thereof can be advantageously enhanced and excellent use is achieved. The advantage that durability can be ensured is also obtained.

Further, in the frameless mold making machine according to the present invention, as described above, the exhaust passage open at the side surface is formed inside the pattern plate formed by bonding a plurality of plate materials. Since the vent hole communicating with such an exhaust passage is formed so as to penetrate through the plate member that gives the pattern plate, for example, a plurality of plate members may be provided with a plurality of exhaust passages between them. After bonding in the state of providing the vent plate, a predetermined plate member is provided with a vent hole penetrating the plate member and communicating with the exhaust passage at an arbitrary position. The vent hole including the exhaust passage can be arranged at an arbitrary position in the opening on the molding space side, so that the degree of freedom of the position of the vent hole can be advantageously increased. It's that.

According to one of the preferred embodiments of such a frameless mold making machine according to the present invention, the pattern plate has a plurality of outer plate members each having a smaller area than each of the outer plate members. While having a structure in which the intermediate plate materials are sandwiched between and bonded to each other, a plurality of these intermediate plate materials are provided on the bonding surface with the other of at least one of the two outer plate materials while leaving a gap therebetween. By being positioned, the groove is configured with such a gap.

If such a configuration is adopted, for example, a groove is formed by cutting or the like on the bonding surface of at least one plate member of the plurality of plate members providing the pattern plate with another plate member other than the plate member. Compared with the case, not only the processing for forming the groove can be performed very easily, but also the pressure resistance of the plate material on which the groove is formed, and by extension, the pattern plate is lowered by the formation of the groove. It can be advantageously prevented.

According to another advantageous aspect of the frameless mold making machine according to the present invention, the cross-sectional area of the exhaust passage is smaller than the cross-sectional area of the ventilation hole. If such a configuration is adopted, the flow velocity of the compressed air guided from the ventilation hole into the exhaust passage can be increased in the exhaust passage due to the throttling effect, which allows, for example, fine molding sand to pass through. Even if it is possible for the foundry sand to enter the exhaust passage through the pores, the invading foundry sand can be smoothly discharged through the opening to the outside of the exhaust passage, so that the exhaust passage enters the inside. The clogging with fine molding sand can be advantageously prevented.

Further, in the present invention, in order to solve the second technical problem, the outer sides of the two molds having a cylindrical frame shape that are butted against each other and held. By fitting the squeeze plate into the opening, the molding sand is formed in each of the molds, through the sand supply port provided at one of the facing parts of the peripheral wall of each mold, and the molding sand is formed. While blowing and filling with compressed air, while discharging the compressed air from the vent hole provided in the other of the facing portion, by compacting the molding sand filled in each molding space with the squeeze plate, In a frameless mold making machine configured to mold a pair of frameless molds, the two molds abutted against each other were sandwiched so that the inner openings of the respective molds were closed. In the pattern plate in which the model is integrally provided on the surface for forming the predetermined molding space in each mold by being used in a state, a plurality of plate materials are attached and At least one plate member of the plate member, a bonding surface with a plate member different from that, by continuously extending toward the peripheral portion, and by providing a groove that opens laterally at the peripheral portion, Extending continuously towards the side,
Further, an exhaust passage opening to the outside of the molding space is formed on the side surface, and further, ventilation holes penetrating the plate material and having openings at both ends thereof are provided to the exhaust passage and the molding space, respectively. A pattern plate for a frameless mold making machine, which is characterized in that it is also the subject of the present invention.

In such a pattern plate according to the present invention, between the plurality of plate materials bonded to each other,
An exhaust passage opening to the outside is formed on the side surface of the pattern plate, and the exhaust passage is provided on a surface of at least one plate member of the plurality of plate members, the groove being provided on a bonding surface of the plate member different from the plate member. On the other hand, since the vent holes communicating with the exhaust passage are provided in the plate members, the plate members are, for example, perpendicular to the inside of the plate member. By bending and forming a hole opening on the side surface, the arrangement structure of the vent hole and the exhaust passage is extremely advantageously simplified as compared with the case where the vent hole and the exhaust passage are formed. To get.

Therefore, in the pattern plate for the frameless mold making machine according to the present invention, the manufacturability of the pattern plate can be effectively enhanced. Therefore, it can be advantageously used while simplifying its structure.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to more specifically clarify the present invention, the structure of a frameless mold making machine according to the present invention and a pattern plate used therein will be described in detail with reference to the drawings. I will explain.

First, FIG. 1 schematically shows a frameless mold making machine having a structure according to the present invention. In FIG. 1, reference numerals 10 and 12 are an upper frame and a lower frame as molds, which have a substantially rectangular frame shape, and a support base 16
The guide bars 14 provided on the two sides support each other so as to be movable toward and away from each other. And the support stand 16 which supports such an upper frame 10 and a lower frame 12
Is reciprocally rotated by the reversing cylinder 18 in the direction of the arrow in the figure by approximately 90 degrees.

Further, here, as shown by the chain double-dashed line in FIG. 1, in the rotating position of the support base 16 where the upper frame 10 and the lower frame 12 are superposed in the horizontal direction,
An upper squeeze device 20 and a lower squeeze device 22 each provided with a squeeze plate 19 are provided on both sides of the upper frame 10 and the lower frame 12 in the overlapping direction, and the upper frame 10 and the lower frame 10 are provided. A blower device 23 is arranged above the frame 12. further,
As shown by the solid line in FIG. 1, the upper frame 10 and the lower frame 1
2 and the support stand 16 which will be piled up in the vertical direction.
At the turning position, the mold removing device 24 and the mold receiving device 26 are arranged at both sides in the overlapping direction of the upper frame 10 and the lower frame 12, respectively.

When the desired frameless mold is produced by the frameless mold making machine having the above structure,
First, at the rotational position of the support base 16 as shown by the solid line in FIG. 1, as shown in FIG.
A model 28, 28 molded into a required casting shape by a pattern transfer device (not shown) between the surfaces facing each other.
A pattern plate 30 integrally formed in a substantially central portion is guided and positioned so that the pattern plate 30 is sandwiched and one of the openings is closed by the pattern plate 30. 10 and the lower frame 12,
To be matched.

Next, as shown in FIG.
Is rotated to a rotation position as shown by an imaginary line in FIG. 1, and further, the outer openings of the upper frame 10 and the lower frame 12 (the side opposite to the side closed by the pattern plate 30). Squeeze plates 19 and 19 of the upper squeeze device 20 and the lower squeeze device 22, respectively, are fitted into the upper frame 10 and the lower frame 12 by covering the openings. A predetermined molding space 32,
32 is formed. Further, there, a sprue bar 34 is erected on the squeeze plate 19 of the upper squeeze device 20, and the tip end surface thereof is brought into contact with the pattern plate 30 in the molding space 32.

Thereafter, under such a condition, the upper frame 10
And sand supply ports 3 respectively provided on the peripheral wall of the lower frame 12
6 and 36, in those molding spaces 32 and 32,
Foundry sand 38 is blown and filled together with compressed air from the blowing device 23. At this time, the upper frame 10 and the lower frame 12
And the formation site of the sand supply ports 36, 36 in each peripheral wall part of
The compressed air blown into the molding spaces 32, 32 is discharged from the vent holes 39, which are respectively provided in a plurality at the facing portions.

After the casting sand 38 is filled, both squeeze plates 1 in the upper and lower squeeze devices 20, 22 are filled.
9, 19 are displaced in a direction approaching each other with a predetermined pressure, and the molding sand 38 is compressed into the upper mold 40 and the lower mold 42 as a mold,
It is molded (see FIG. 4).

Then, after the upper mold 40 and the lower mold 42 are formed,
The squeeze plates 19 and 19 of the upper and lower squeeze devices 20 and 22 are released. Further, at the same time when the squeeze plates 19 and 19 are released, the sprue bar 34
The die is also die-cut, so that a sprue 43 having a shape corresponding to the sprue bar 34 is formed inside the upper die 40 (FIG. 4).
reference).

Subsequently, after the squeeze plates 19 and 19 are released from the mold, the support base 16 is rotated to the rotation position as shown by the solid line in FIG. 1, and as shown in FIG. By separating the frame 10 and the lower frame 12 from each other, the pattern plate 30 having the model 28 is die-cut from the upper die 40 and the lower die 42.

Then, after removing the pattern plate 30 and further accommodating the core, if necessary, FIG. 5 and FIG.
As shown in FIG. 5, the upper frame 10 and the lower frame 12 are overlapped again, and the upper die 40 and the lower die 42 are superposed on each other by the mold removing device 24. From the frame 12, the molded molds 40 and 42 are transferred to the mold receiving device 2
Remove on top of 6. As a result, as shown in FIG.
The casting cavity 44 having a predetermined shape, and the casting cavity 4
Thus, the target frameless mold is obtained, in which the sprues 43 communicating with 4 are formed inside. In addition, in the present embodiment, in order to improve the mold releasability of the molded upper and lower dies 40 and 42, the opening side end portion of the inner peripheral surface of the upper and lower frames 10 and 12 which is overlapped with the pattern plate 30. Is tapered over a predetermined length.

By the way, as is apparent from FIG. 8 which is an enlarged cross-sectional view of a part of the mold making machine, the mold making machine of the present embodiment having such a structure is mounted there. A plurality of pattern plates 30 are provided between the two outer plates 46, 46 (here, eight as shown in FIG. 10).
The intermediate plate 48 is sandwiched and they are bonded together, and an exhaust passage 50 is provided between the two outer plates 46, 46.

More specifically, here, as shown in FIGS. 9 to 11 showing the front face form, the vertical cross-sectional form and the horizontal cross-sectional form of the pattern plate 30, here, the two outer plates 4 are provided.
A plurality of intermediate plates 48 sandwiched between 6, 46 are respectively
It has the same thickness, but has a thickness smaller than each outer plate 46 by a predetermined dimension, and has the same length as the outer plate 46 and a width sufficiently smaller than the outer plate 46. By doing so, the area of the contact surface with the outer plate 46 is made sufficiently smaller than the contact surface of the outer plate 46 with respect to each of the intermediate plates 48, that is, the area of the bonding surface of each outer plate 46.

Then, the plurality of intermediate plates 48 are provided on one surface of one of the two outer plates 46, 46 with a small gap between adjacent ones. In a state where they are positioned so as to be arranged side by side in the width direction of the outer plate 46, they are adhered using, for example, an appropriate adhesive or the like.
Thus, one outer plate 46 of such a plurality of intermediate plates 48 is formed.
On the one surface of the outer plate 46 by each of the gaps formed between the respective intermediate plates 48 under the adhesive state to
Grooves 52 that extend continuously in the length direction of the outer plate 46 with a relatively small width and that are open to the side at both end edges in the length direction of the outer plate 46 have a width direction of the outer plate 46. Further, they are formed in a state in which they are positioned so as to extend in parallel to each other, with a gap corresponding to the width of the intermediate plate 48 being provided.

Then, another outer plate 46 is provided on one surface side of the outer plate 46 where the plurality of grooves 52 are provided.
Are covered with the plurality of intermediate plates 50 while covering the upward openings of the plurality of grooves 52, and are bonded to the plurality of intermediate plates 50 with an appropriate adhesive or the like. In addition, under such a bonded state, the upper opening was covered with the outer plate 46 between the two outer plates 46, 46, but the side opening was secured. The exhaust passage 50 is formed by the plurality of grooves 52 (see FIG. 8).

Thus, here, the two outer plates 46, 4 are
6 are adhered to the plurality of intermediate plates 48 in a state of being overlapped with each other via the plurality of intermediate plates 50, so that they are attached to each other with the plurality of intermediate plates 48 sandwiched therebetween. Further, the pattern plate 30 is configured by a so-called sandwich structure, and the pattern plate 30 having such a sandwich structure has a relatively small width inside.
A plurality of exhaust passages 50 extending continuously in the length direction of the pattern plate 30 and opening to the outside on the side surface of the pattern plate 30 are formed at predetermined intervals in the width direction of the pattern plate 30.

Further, as shown in FIGS. 8 and 9, a pattern plate 30 having such a structure is provided 2
Each of the outer plates 46, 46 is provided with a plurality of circular ventilation holes 54 penetrating them in the plate thickness direction. The plurality of vent holes 54 are arranged so as to be scattered along the extending direction of the exhaust passages 50 provided inside the pattern plate 30, and the exhaust passages 50 are provided.
Are connected to each other. That is, each ventilation hole 54
Are pierced through the outer plates 46 and open outward on the front surface of the outer plates 46, while the exhaust passages 50 are formed on the rear surfaces (bonding surfaces of the outer plates 46).
It is opened inward.

Further, each of the vent holes 54 is configured to have a cross-sectional area larger than that of the exhaust passage 50, and air is allowed to pass through the opening. However, a vent plug 56 having a slit structure that does not allow the molding sand to easily pass through is fitted therein.

Further, here, the model 28 integrally formed with the pattern plate 30 is provided with the recess 58, but the model 2 is also provided at the bottom of the recess 58.
Vents 54 are provided through which each skin 4
6 are located at corresponding positions so as to communicate with the ventilation holes 54 formed in 6. A vent plug 56 similar to the vent plug 56 fitted inside the vent hole 54 of each outer plate 46 is also fitted inside the vent hole 54 of the model 28.

Then, as shown in FIG. 8, the pattern plate 30 having the above-described structure exposes each side surface to the outside of each molding space 32, while each outer plate 46 and each ventilation hole 54 of the model 28. In a state in which the surface portion where is formed is exposed in each molding space 32, it is sandwiched and arranged between the upper frame 10 and the lower frame 12. As a result, in the present embodiment, the ventilation holes 54 provided in the outer plates 46 and the model 28 have the molding space 32 and the exhaust passage 50 at both ends.
And are opened respectively, so that each molding space 32 is formed through the ventilation hole 54 and the exhaust passage 50.
It is in communication with the outside.

As described above, in the present embodiment, the vent hole 54 and the exhaust passage 5 provided in the pattern plate 30.
0 through the molding space 32 in the upper frame 10 and the lower frame 12,
When the casting sand 38 is blown and filled into the respective molding spaces 32 from the sand supply ports 36, 36 together with the compressed air, as described above, the compressed air is blown from above. In addition to being discharged from the vent holes 39 provided in the peripheral wall portions of the frame 10 and the lower frame 12, they are also discharged from the vent holes 54 of the pattern plate 30 and the exhaust passage 50 to the outside. Since the molding sand 38 supplied into each molding space 32 can be smoothly flowed together with the compressed air in both the direction parallel to the pattern plate 30 and the direction toward the pattern plate 30 with excellent fluidity. is there.

Further, in this embodiment, the vent hole 54 communicating with the exhaust passage 50 in the pattern plate 30 is also provided in the bottom of the recess 58 of the model 28 integrally provided in the pattern plate 30. , Such a model 28
The casting sand 38 can be smoothly made to flow with the compressed air also into the recess 58 with excellent compressed fluidity.

In addition, in the present embodiment, the pattern plate 30 has a sandwich structure in which a plurality of intermediate plates 48 are sandwiched between two outer plates 46, 46 and these are bonded together. The exhaust passage 50 formed inside the pattern plate 30 is constituted by a plurality of grooves 52 formed between a plurality of intermediate plates 48 sandwiched between two outer plates 46, 46, Further, a ventilation hole 54, which is communicated with such an exhaust passage 50, penetrates the outer plate 46 and the model 28, and each exhaust passage 5
0 and the molding space 32 are provided so as to open, so that, for example, a passage (vent hole) for discharging the compressed air blown into the molding space 32 to the outside,
Compared with the case where a hole is formed at a right angle inside a single plate member, the structure for providing such a passage can be simplified extremely advantageously.

Therefore, in the present embodiment, the casting sand 38 including the peripheral corners of the model 28 integrally formed on the pattern plate 30 and the corners in the recesses 58 formed in the model 28, etc. The molding space 32 can be sufficiently and uniformly filled, and the passage for discharging the compressed air to the outside is formed so as to be bent inside.
The manufacturability of the pattern plate 30, and by extension, the manufacturability of the entire frameless mold making machine, can be effectively enhanced as compared with the conventional frameless mold making machine having the pattern plate made of one plate material. Of.

Therefore, in this embodiment, the structure capable of discharging the compressed air blown into the molding space 32 to the outside is desired while using the pattern plate 30 which can be realized with excellent manufacturability. Thus, it is possible to easily manufacture a frameless mold having a shape, sufficient compaction strength, hardness and the like.

Further, in this embodiment, the pattern plate 30 has a sandwich structure in which two outer plates 46, 46 and a plurality of intermediate plates 48 sandwiched therebetween are integrally bonded. Therefore, the strain resistance of the pattern plate 30 can be advantageously increased, and the improvement of the use durability can be effectively realized.

Further, in the present embodiment, for example, two outer plates 46, 46 are attached to each other with a plurality of exhaust passages 50 provided between them, and then the outer plates 46 are attached to each of them. By providing the ventilation hole 54 that penetrates and communicates with the exhaust passage 50, compressed air composed of the ventilation hole 54 and the exhaust passage 50 is discharged from the molding space 32 according to the position where the ventilation hole 54 is formed. The advantage is that the passage for discharging to can be arranged at any position.

Further, in the present embodiment, the exhaust passage 50 provided inside the pattern plate 30 has two outer plates 4.
Since it is constituted by a plurality of grooves 52 formed by gaps formed between the plurality of intermediate plates 48 sandwiched by 6, 6, the groove 52, in other words, the exhaust passage 50 is formed. For this reason, for example, it is possible to eliminate the need for cutting or the like on the bonding surface of the outer plate 46, whereby the processing for forming the groove 52 and the exhaust passage 50 can be performed very easily. Instead, the strength of the outer plate 46 and thus the entire pattern plate 30 can be advantageously prevented from being lowered by the formation of the groove 52.

Further, in the present embodiment, of the vent hole 54 and the exhaust passage 50, which constitute the passage for discharging the compressed air blown together with the molding sand 38 into the molding space 32 to the outside.
Since the cross-sectional area of the exhaust passage 50 is made smaller than the cross-sectional area of the ventilation hole 54, the flow rate of the compressed air introduced from the ventilation hole 54 into the exhaust passage 50 is increased by the throttling effect, whereby For example, even if the fine foundry sand 38 is allowed to enter the exhaust passage 50 through the vent hole 54, the entered fine foundry sand 38 does not stay in the exhaust passage 50, and together with the compressed air, The exhaust passage 50 can be discharged more smoothly to the outside.
However, it can be advantageously prevented from being clogged with the fine foundry sand 38 that has penetrated into the inside.

Further, in the present embodiment, the vent plug 56, which allows compressed air to pass through but does not allow the molding sand 38 to pass through easily, is inserted into each of the vent holes 54. Intrusion of the foundry sand 38 is prevented as much as possible, and clogging of the exhaust passage 50 with the foundry sand 38 can be advantageously avoided.

The specific construction of the present invention has been described above in detail, but this is merely an example, and the present invention is not restricted by the above description.

For example, in the above embodiment, the ventilation hole 54
However, although the model 28 integrally formed with the pattern plate 30 is also provided, depending on the shape of the model 28, the formation of the vent hole 54 for the model 28 may be omitted.

Further, the shape, the number of the ventilation holes 54, and the positions of the ventilation holes 54 are not limited to those shown in the above-described embodiment, and the exhaust gas can be passed through the outer plate 46 and exhausted. It suffices to have a structure that opens to the passage 50 and the molding space 32.

Further, the shape and the number of exhaust passages 50,
Of course, the arrangement position and the arrangement position are not limited to those shown in the embodiment, and
The pattern plate 30 may be provided so as to extend from the inner peripheral portion of the pattern plate 30 toward one side surface in the length direction and the width direction thereof and to be laterally opened on only one such side surface. It is also possible to provide so as to draw a vortex from the portion toward the outer peripheral portion and to open laterally on any side surface.

Further, in the above embodiment, the exhaust passage 50
However, a plurality of intermediate plates 48 sandwiched between two outer plates 46, 46.
Although it was formed by the plurality of grooves 52 formed by the gaps formed between the plurality of grooves, for example, the plurality of grooves 5 are formed on the bonding surface of at least one of the two outer plates 46, 46.
It is also possible to provide 2 by cutting or the like, or to manufacture the outer plate 46 having the plurality of grooves 52 by casting or the like, and form the exhaust passage 50 in the grooves 52 thus formed. Thereby, the plurality of intermediate plates 48 can be omitted, and the reduction of the material cost at the time of manufacturing the pattern plate 30 and the weight reduction of the pattern plate 30 can both be advantageously achieved.

Further, in the above embodiment, one outer plate 4 is used.
6, a plurality of intermediate plates 48 are bonded (not limited to bonding), and another outer plate 46 is bonded to the outer plate 46 to which the plurality of intermediate plates 48 are bonded. , The pattern plate 30 was made,
Of course, the manufacturing process of the pattern plate 30 is not limited to this, and for example, 2
The outer plates 46, 46 may be attached to each other via a plurality of intermediate plates 48 by a method other than bonding, or the two outer plates 4 may be joined together.
It is also possible to bond the two outer plates 46, 46 to each other while the intermediate plate 48 is respectively bonded to the bonding surfaces of 6, 6 respectively.

Further, the number of plate materials constituting the pattern plate 30 is not particularly limited to that shown in the above-mentioned embodiment, and two or four or more plate materials are stuck together to form the pattern plate. Even if 30 is formed, there is no problem.

In addition, in the above-mentioned embodiment, in a state where a pair of molds are superposed in the horizontal direction, the casting is made downward while utilizing gravity also through the sand supply port which is positioned vertically upward. A specific example of applying the present invention to a vertical blow type molding machine, which is adapted to blow-fill sand with a molding space, shows a specific example of the present invention. It is also applicable to a horizontal blow molding machine or the like in which the molding sand is blow-filled in the molding space through the sand supply port that is opened in the horizontal direction.

Although not listed one by one, the present invention is
It can be carried out in an embodiment in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and such an embodiment does not depart from the gist of the present invention.
Both are included within the scope of the present invention,
Needless to say.

[0059]

As is apparent from the above description, in the frameless mold making machine according to the present invention, the casting sand can be advantageously improved in fluidity in the direction toward the pattern plate. Along with this, the pattern plate, which is configured with vent holes that discharge the compressed air blown into the molding space to the outside, can have a structure that can realize excellent manufacturability, which allows the desired shape and sufficient It is possible to easily manufacture a frameless mold having a high compaction strength, hardness, and the like.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing an example of a frameless mold making machine having a structure according to the present invention.

FIG. 2 is an explanatory view for explaining one step of molding by the frameless mold molding machine shown in FIG.

FIG. 3 is an explanatory diagram for explaining a molding process subsequent to the process shown in FIG.

FIG. 4 is an explanatory diagram for explaining a molding process subsequent to the process shown in FIG.

FIG. 5 is an explanatory diagram for explaining a molding process following the process shown in FIG.

FIG. 6 is an explanatory diagram for explaining a molding process that follows the process shown in FIG.

FIG. 7 is an explanatory diagram for explaining a molding process subsequent to the process shown in FIG.

FIG. 8 is a vertical cross-sectional explanatory view showing an enlarged main part of the frameless mold making machine shown in FIG.

FIG. 9 is a front explanatory view showing an example of a pattern plate equipped in the frameless mold making machine shown in FIG.

10 is a transverse cross-sectional view of the pattern plate shown in FIG. 9, which is a cross-sectional view corresponding to the XX cross section in FIG. 8;

11 is a cross-sectional view taken along the line XI-XI in FIG.

[Explanation of symbols]

10 Upper Frame 12 Lower Frame 19 Squeeze Plate 23 Blower Device 28 Model 30 Pattern Plate 32 Molding Space 36 Sand Supply Port 38 Sand Sand 40 Upper Mold 42 Lower Mold 46 Outer Plate 48 Middle Plate 50 Exhaust Passage 52 Groove 54 Vent Hole

Claims (4)

[Claims] 1. Two molds having a tubular frame shape,
A pattern plate having a model integrally provided on the surface is sandwiched between, and butted so that one opening of each of the molds is closed by the pattern plate,
By holding it and fitting a squeeze plate into the other opening of each mold, a predetermined molding space is formed in each mold, and further, in one of the facing parts of the peripheral wall of each mold. While providing a sand supply port for supplying the molding sand, a vent hole is provided at the other of the facing portions, and while the molding sand is blown and filled with compressed air through the sand supply port, the compression is performed. While discharging air from the vent hole, by compacting the molding sand filled in each molding space with the squeeze plate, in a frameless mold molding machine configured to mold a pair of frameless molds , The pattern plate having a structure in which a plurality of plate members are attached to each other, and at least one plate member of the plurality of plate members other than the plate member By providing a groove on the bonding surface with and extending continuously toward the peripheral edge thereof and opening to the side at the peripheral edge, the inside of the pattern plate is continuously extended toward the side surface of the pattern plate. Forming an exhaust passage that extends to the outside of the molding space on the side surface,
Further, ventilation holes are formed in the pattern plate and / or the model provided on the pattern plate, the ventilation holes penetrating the plate material and opening at both ends thereof to the exhaust passage and the molding space, respectively. A frameless mold making machine characterized by the above. 2. The pattern plate has a structure in which two outer plate members are bonded together with a plurality of intermediate plate members having a smaller area than each of the outer plate members sandwiched therebetween, and the plurality of outer plate members are bonded together. The groove is formed in such a gap by positioning the intermediate plate member on the bonding surface of at least one of the two outer plate members with the other while opening a gap therebetween.
The frameless mold making machine described in 1. 3. The frameless mold making machine according to claim 1, wherein a cross-sectional area of the exhaust passage is smaller than a cross-sectional area of the ventilation hole. 4. A squeeze plate is formed in each of the two molds, which are held in abutment with each other and have a cylindrical frame shape, by fitting squeeze plates into the respective outer openings. In a predetermined molding space, the mold is blown and filled with compressed air through a sand supply port provided at one of the facing portions of the peripheral wall portion of each mold, and a vent hole is provided at the other facing portion. While discharging the compressed air from, by compacting the molding sand filled in each molding space with the squeeze plate, in a frameless mold molding machine configured to mold a pair of frameless molds, The predetermined molding space is provided in each of the molds by being used in a state of being sandwiched between the two molds butted against each other so that the inner opening of each of the molds is closed. Pattern plates each having a model integrally formed on the surface, each of which is formed by laminating a plurality of plate materials, and at least one plate material of the plurality of plate materials, which is different from the plate material. By providing a groove that is continuously extended toward the peripheral edge of the bonding surface with and is opened laterally at the peripheral edge, the groove is continuously extended toward the side surface and the molding is performed on the side surface. An exhaust passage opening to the outside of the space is formed, and further, the plate material is configured to penetrate through the plate material, and at both end openings thereof, vent holes are provided to open to the exhaust passage and the molding space, respectively. Pattern plate for frameless mold making machine.