JPH08323449A - Flaskless molding method, pattern for flaskless mold and flaskless molding machine - Google Patents

Abstract

PURPOSE: To provide a flaskless molding method capable of favorably manufacturing various kinds of molds of different molding cavity by a same flask. CONSTITUTION: In filling the molding sand 38 in the molding cavity 34 formed in side by covering an opening part on each side in the axial direction of flasks 10,12 by a pattern plate 30 and a squeeze plate 19, the filling position of the molding sand 38 through molding sand feeding ports 36,37 relative to the molding cavity 34 is changed to the inserting direction of the squeeze plate 19 in the flasks 10,12 according to the pattern plate 30.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a molding technique of a frameless mold having no mold, and particularly to a frameless mold molding suitably applied in molding of various molds having different sizes of casting cavities. The present invention relates to a method, a mold for frameless mold making and a frameless mold making machine that can be preferably used in such a molding method.

[0002]

2. Description of the Related Art Conventionally, as a type of mold making machine, as described in Japanese Patent Publication No. 60-21810, Japanese Patent Publication No. 62-45016, and Japanese Utility Model Publication No. 62-4369, a model is integrated. A pair of cylindrical frame-shaped molds are superposed and held with the pattern plate formed in between, and the squeeze plates are fitted from the outer openings of each of the molds, thereby making A predetermined molding space is formed in the molding space, the molding sand is filled in the molding space through the sand supply port provided in the peripheral wall of each mold, and the molding space is compacted by a squeeze plate to form a pair of molds. There is known a frameless mold making machine in which a mold of (1) is molded and then the mold is extracted from the mold to obtain a frameless mold.

By the way, in such a frameless type mold making machine, it is possible to make a mold having casting cavities of various shapes by using the same mold by exchanging only the pattern plate. At that time, depending on the size of the model formed on the pattern plate, the size of the molding space is changed by adjusting the amount of the squeeze plate fitted into the form frame, so that the appropriate degree of compression of the molding sand and the mold thickness can be obtained. A method for obtaining the above is proposed in Japanese Examined Patent Publication No. 62-45016.

However, in the conventional mold, generally, the sand supply port is formed substantially in the central portion in the axial direction of the mold (the direction in which the squeeze plate is inserted), and the squeeze plate is located deeper than the sand supply port. Since it is impossible to fill the molding sand when it is inserted, there is a problem that the maximum insertion amount of the squeeze plate is limited by the position of the sand supply port, and when the model height is extremely low. It was difficult to set the mold thin to an appropriate thickness.

On the other hand, when the height of the model formed on the pattern plate is high, in order to obtain sufficient and stable filling of the molding sand with the molding sand, the shadow on the back side of the model with respect to the sand supply port. Since it is necessary to minimize the area that is not directly filled with the molding sand as the part of the above, there is a problem that the model height that can be adopted is limited by the position of the sand supply port. However, in reality, it was difficult to make the model height higher than the position of the sand supply port.

That is, if the sand supply port in the mold is formed closer to the opening where the squeeze plate is fitted, it becomes difficult to obtain an appropriate mold thickness when molding a mold having a shallow casting cavity. When the position of the sand supply port in the mold is formed close to the opening side where the pattern plates are overlapped, it is difficult to obtain sufficient filling properties of the molding sand when molding a mold having a deep casting cavity. . And in this way, with respect to the position of the sand supply port, the depth of the casting cavity,
In other words, there is a problem that the molds that can be molded are limited by the position of the sand supply port, because there are conflicting requirements depending on the size of the model.

When the height of the model formed on the pattern plate is high, a rectifying plate is provided at the sand supply port in order to reduce the area where the casting sand is not directly filled with the casting sand. It may be possible to discharge the squeeze plate toward the squeeze plate and bounce off the squeeze plate to guide it to the back side of the model. It was difficult to obtain the effect, and it was not always an effective method.

[0008]

Here, the present invention has been made in the background of the circumstances as described above, and the problem to be solved is to be able to advantageously cope with large and small models,
Setting of a suitable mold thickness when the model is low, and good filling of the molding sand when the model is high can both be effectively achieved, and is suitable for a novel frameless mold molding method and such a molding method. (EN) Provided is a frameless mold making mold and a frameless mold making machine which can be used.

[0009]

In order to solve such a problem, a feature of the method of the present invention resides in that a pattern plate is superposed on one opening side end of a mold having a tubular frame shape. While closing the opening of the, the squeeze plate is inserted into the other opening-side end of the mold to cover the other opening to form a molding space inside the mold,
When molding a frameless mold by filling the molding space with molding sand through the sand supply port provided in the peripheral wall of the mold, the position of the sand supply port for filling the molding space with the molding sand, the pattern plate According to the above, there is a frameless mold making method in which the insertion direction of the squeeze plate in the mold is changed.

Furthermore, the present invention has a tubular frame shape, and the pattern plate is superposed on one opening side end portion to close the one opening side portion and from the other opening side end portion. A squeeze plate is inserted to cover the other opening to form a molding space inside, while a sand supply port for filling the molding space with foundry sand is provided on the peripheral wall portion without a frame. The mold for mold for mold making is also characterized by a frame for mold making for mold making which is provided with a plurality of sand supply ports spaced from each other in the insertion direction of the squeeze plate.

In a preferred first aspect of the present invention relating to a frameless mold making mold, the plurality of sand supply ports are provided on the same side surface of the peripheral wall portion.

Further, according to the present invention, a pair of cylindrical frame-shaped molds are superposed and held with a pattern plate sandwiched therebetween, and a squeeze plate is fitted into each of the outer openings of the respective molds. While forming a predetermined molding space in both molds, a pair of frameless molds is formed by filling and molding the molding sand into the molding space through the sand supply port provided in the peripheral wall of each mold. In a frameless mold making machine for molding, the sand supply port in at least one of the molds is formed with a plurality separated from each other in the insertion direction of the squeeze plate, and the molding sand through the plurality of sand supply ports. It is also characterized by a frameless mold making machine provided with a supply port selection means for controlling the supply and switching the sand supply port for filling the molding space with the molding sand.

In a preferred first aspect of the present invention relating to a frameless mold making machine, the pair of molds are arranged so as to be superposed in a horizontal direction with a pattern plate interposed therebetween and held. The sand supply port is provided so as to open on the upper side surface of the peripheral wall portion of the mold.

Furthermore, in a second preferred embodiment of the present invention relating to a frameless mold making machine, a plurality of blow ports are provided which are respectively connected to a plurality of sand supply ports to introduce casting sand, and those blow ports are blown. The supply port selection means is configured by opening and closing at least one of the ports.

In a preferred third aspect of the present invention relating to a frameless mold making machine, a blow port connected to any of a plurality of sand supply ports for guiding foundry sand is provided with respect to the sand supply port. The supply port selecting means is configured by being connectable / separable and changing the sand supply port connecting the blow port.

In a fourth preferred aspect of the present invention relating to a frameless mold making machine, a plurality of blow ports are provided which are respectively connected to a plurality of sand supply ports to introduce casting sand, and the plurality of blow ports are provided. The blow port is integrally slidable along the outer surface of the mold in the arrangement direction of the sand supply port, and the slide port displaces the blow port from the sand supply port to the sand supply port of the blow port. While the connection of the blow port is blocked, the opening width of the blow port in the slide movement direction is set to be large in some of the plurality of blow ports or the sand supply ports, and the blow port is slid and moved. Even if the blow port and the sand supply port are maintained in communication with each other, the supply port selection means is configured.

[0017]

According to the method of the present invention, the sand supply port can be adjusted to an appropriate position according to the size of the model formed on the pattern plate. Therefore, for example,
When the height of the model is low, by setting the sand supply port only at a position close to the pattern plate, the squeeze plate can be inserted deeply and the mold thickness can be set small, while the height of the model is high. By setting the sand supply port at a position away from the pattern plate, it is possible to secure the filling property of the casting sand by reducing the area that does not directly fill the casting sand in the shadow of the model.
This makes it possible to advantageously deal with the same mold for molding a mold having casting cavities of various shapes.

In the frameless mold making machine and the frameless mold making machine having the structure according to the present invention, the pattern plate is formed with the sand supply port for filling the molding space with the molding sand. Depending on the height of the model and the like, it is possible to select and use an appropriate one from a plurality of things provided in the axial direction of the mold (the squeeze plate insertion direction).

Therefore, in the frameless mold making mold and the frameless mold making machine having the structure according to the present invention, the above-described method of the present invention can be advantageously carried out. When the height of the model is low, it is possible to fit the squeeze plate deeply and set the mold thickness sufficiently small by using only the sand supply port provided near the pattern plate. When the height is high, the sand supply port provided at a position away from the pattern plate is used to reduce the area where the casting sand is not directly filled, which is a shadow of the model. As a result, it becomes possible to favorably use the same mold frame for molding of molds having casting cavities of various shapes. That.

Further, in the first preferred embodiment of the present invention relating to the frameless mold making mold and the first preferred embodiment of the present invention relating to the frameless mold making machine, molding sand is used as a molding space. On the other hand, since it is possible to carry out blow filling in the vertical direction through the sand supply port, it is possible to exhibit a further excellent filling property of the foundry sand.

Further, in the second to fourth preferred embodiments of the present invention relating to the frameless mold making machine, in any of the plurality of sand supply ports formed in the mold, the sand is formed into the molding space. A feed port selection means for selectively switching the appropriate sand feed port for filling the foundry sand may be advantageously constructed.

[0022]

EXAMPLES Examples of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First of all, FIG. 1 shows a frameless mold making machine comprising an upper frame 10 and a lower frame 12 as a formwork having a structure according to the present invention, which can advantageously carry out the method of the present invention. Are shown schematically. In such a frameless mold making machine, the upper frame 10 and the lower frame 12 have a substantially rectangular frame shape, and the guide bar 1 provided on the support base 16 is provided.
4, they are supported so as to be movable toward and away from each other. In addition, these upper frame 10 and lower frame 12
The support base 16 for supporting the
It can be reciprocally rotated about 90 degrees in the direction of the arrow in the figure. Further, as shown by phantom lines in the figure, at the pivotal position of the support base 16 where the upper frame 10 and the lower frame 12 are superposed in the horizontal direction, the upper frame 10 and the lower frame 12 are moved. Located on both sides in the stacking direction,
An upper squeeze device 20 and a lower squeeze device 22 each having a squeeze plate 19 are provided, and a blow device 23 is provided above the upper frame 10 and the lower frame 12. . On the other hand,
As shown by the solid line in the figure, the upper frame 10 and the lower frame 12 are superposed on each other at the pivotal position of the support 16 where the upper frame 10 and the lower frame 12 are superposed in the vertical direction. A mold removing device 24 and a mold receiving device 26 are arranged on both sides in the direction.

When molding a mold by the frameless mold making machine having such a structure, first, as shown in a solid line in FIG. As shown in the figure, a model 28 molded into the required casting shape is integrally formed in the central portion between the facing surfaces of the upper frame 10 and the lower frame 12 by a pattern transfer device (not shown). The pattern plate 30 is guided and positioned, and the upper frame 10 and the lower frame 12 are overlapped with each other with the pattern plate 30 sandwiched therebetween.

After that, as shown in FIG. 3, the support base 16 is rotated to a rotation position as shown by an imaginary line in FIG. 1, and the upper frame 10 and the lower frame 12 are further rotated. The squeeze plates 19 and 19 of the upper squeeze device 20 and the lower squeeze device 22 are fitted into the outer openings, and the openings are covered, so that the upper frame 10 and the lower frame 12 have predetermined interiors. Molding space 3
4, 34 are formed. Further, there, a sprue bar 35 is erected on the squeeze plate 19 of the upper squeeze device 20, and its tip end surface is brought into contact with the pattern plate 30 in the molding space 34.

Then, under such a condition, the blower 2 is inserted into the molding spaces 34, 34 through the sand supply ports 36, 36 provided in the upper frame 10 and the lower frame 12, respectively.
From 3, the foundry sand 38 is supplied and filled. Further, after the filling of the molding sand 38, the squeeze plates 19, 19 in the upper and lower squeeze devices 20, 22 are displaced toward each other with a predetermined pressure so that the molding sand 38 is compressed and molded. The upper mold 40 and the lower mold 42 as a mold are respectively molded (FIG. 4).
reference).

After the upper mold 40 and the lower mold 42 are formed, the squeeze plates 19 and 19 in the upper and lower squeeze devices 20 and 22 are released. At the same time when the squeeze plates 19 and 19 are released from the mold, the sprue bar 35 is also demolded, so that the inside of the upper mold 40 is
A gate 43 having a shape corresponding to the gate bar 35 is formed (see FIG. 4).

Further, after the squeeze plates 19 and 19 are released from the mold, the support base 16 is rotated to a rotation position as shown by the solid line in FIG. 1, and as shown in FIG. By separating the upper 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 extracted onto the mold receiving device 26. As a result, as shown in FIG. 7, a desired frameless mold is obtained in which the casting cavity 44 having a predetermined shape and the gate 43 communicating with the casting cavity 44 are formed inside. Be done. In this embodiment, the upper and lower molds 40, 4 formed
In order to improve the mold releasability of No. 2, the inner peripheral surfaces of the upper and lower frames 10 and 12 are provided with a removal taper over a predetermined length of the opening-side end of the one that is superposed on the pattern plate 30. There is.

By the way, in the upper frame 10 and the lower frame 12 mounted on the mold making machine having such a structure,
As shown in the enlarged sectional view of FIG. 8, an inner sand supply port 36 and an outer sand supply port 37 are formed in each case. These two sand supply ports 36 and 37 are provided in the upper frame 10 and the lower frame 1.
In both cases, the sand supply ports 36 and 37 are formed with a predetermined distance from each other in the axial direction which is the insertion direction of the squeeze plate 19.
It is formed on the peripheral wall portion which is located above at the rotational position shown by the phantom line in FIG. 1 and has a rectangular window shape extending in the circumferential direction.

Further, in this embodiment, the inner sand supply port 36
Is formed closer to the opening end on the side where the pattern plates 30 are superposed on each other than the axial center portion of the molds 10 and 12, while the outer sand supply port 37 is formed on the molds 10 and 12. It is formed near the opening end on the side where the squeeze plate 19 is inserted.

Further, as shown in FIG. 8, in the blowing device 23 for filling the molding space 34, 34 formed by the upper and lower frames 10, 12 with the molding sand 38 as shown in FIG. A first sand storage tank 50 and a second sand storage tank, which are arranged so as to be located above the upper frame 10 and the lower frame 12, respectively, which are held at the rotational positions indicated by phantom lines in FIG. 52 is provided. And, at the lower end of each of the sand storage tanks 50, 52,
An inner blow port 54 connected to the inner sand supply port 36 in the upper and lower frames 10, 12 and an outer blow port 56 connected to the outer sand supply port 37 are provided, and the sand is blown through these blow ports 54, 56. The foundry sand 38 stored in the storage tanks 50, 52 is guided to the sand supply ports 36, 37 and blow-filled in the molding spaces 34, 34.

The first and second sand storage tanks 50,
In 52, the lower portion 58 having the inner and outer blow ports 54 and 56 has a hollow body portion 60,
They are connected via an expandable and contractible annular flexible joint 62, and by pulling the lower part 58 toward the main body part 60 side by a driving means (not shown) such as a hydraulic cylinder mechanism,
The inner and outer blow ports 54 and 56 can be separated from the molds 10 and 12. The inner and outer blow ports 54,
With the mold 56 separated from the molds 10 and 12, the mold 1
It is designed to rotate 0 and 12.

The first and second sand storage tanks 50,
In 52, the outer blow ports 56 connected to the outer sand supply ports 37 of the molds 10 and 12 are each provided with a partition plate 64 projecting into the outer blow port 56. 64 is a return cylinder mechanism 66
By being projected by the outer blow port 56
Is cut off and the supply of the foundry sand 38 to the outer sand supply port 37 is stopped.

Therefore, under the condition that the partition plate 64 is retracted from the outer blow port 56, the inner and outer blow ports 56 and 58 are made to communicate with each other, and the inner sand supply port 3
Molding space 34 is filled with foundry sand 38 through both 6 and the outer sand supply port 37, while the partition plate 64 is projected to the outer blow port 56 as shown in phantom in FIG. As a result, the outer blow port 56 is blocked, and only the inner sand supply port 36 is used to form the molding space 34.
It is possible to fill the casting sand 38 with. As is apparent from this, in this embodiment, the partition plate 64 and the return cylinder mechanism 66 are included to configure a supply port selection unit that switches the sand supply port to the molding space 34.

Therefore, in the mold making machine having the above-described structure, the partition plate 64 is projected / retracted with respect to the outer blow port 56 according to the size of the model 28 formed on the pattern plate 30 and the like. Thus, the sand supply port for filling the molding space 34 with the molding sand 38 can be appropriately switched. Therefore, for example, when the height of the model 28 is low, the partition plate 64 is projected. By blocking the outer blow port 56 and filling the molding space 34 with the molding sand 38 only through the inner blow port 54, the squeeze plate 19 is moved beyond the position where the outer blow port 56 is formed and the shafts of the molds 10, 12 are further extended. The insertion position can be set to the inner side of the mold, whereby the molds 40, 4
It is possible to sufficiently reduce the thickness dimension of 2 to set the volume and the compression rate of the foundry sand, and when the height of the model 28 is high, the partition plate 64 is retracted and the outside blow is performed. By allowing the mouth 56 to communicate with each other and filling the molding space 34 with the molding sand 38 also through the outer blow port 56, it is possible to reduce the shadowed area on the back side of the model 28 and obtain excellent molding sand filling properties. It becomes.

In particular, in this embodiment, the inner blow port 54 is always in communication with the outer blow port 5
Since only 6 is controlled to open and close, it is easy to control the opening and closing of the blow ports 54 and 56, and the size of the squeeze plate 19 is reduced due to the large size of the model, resulting in a large volume in the molding space 34. Even when is set, by filling the molding space 34 with the molding sand 38 through both the inner and outer blow ports 54 and 56, the molding sand filling time can be effectively shortened. .

Next, FIG. 9 shows a main part of a frameless mold making machine as a second embodiment of the present invention. In addition, in the present embodiment, illustration is omitted for a portion where the same structure as the first embodiment can be adopted, and only a mechanism portion for supplying the molding sand to the molding space formed in the upper frame is omitted. Along with the drawings, also in the drawings, for members and parts having the same structure as in the first embodiment, the same reference numerals as those in the first embodiment are used to give a detailed description thereof. Omit it.

That is, in this embodiment, a single blow port 70 is provided for the first sand storage tank 50, and the first sand storage tank 50 is shown in phantom in FIG. Upper frame 1 held in the rotational position indicated by the line
0 is movably supported by a guide rod 72 arranged in the axial direction, and a double-acting drive cylinder mechanism 74 arranged at the axial end portion of the guide rod 72 causes the first sand to move. The storage tank 50 is the guide rod 72.
Is reciprocally driven in the axial direction of the upper frame 10. In FIG. 9, 76 is the first storage tank 50.
It is a cylinder mechanism for pulling the lower portion 58, in which the blow port 70 is formed, toward the main body part 60 of the above and separating the blow port 70 from the upper frame 10.

Therefore, in this embodiment, as shown in FIGS. 9 and 10, by moving the first sand storage tank 50, the blow port 70 is moved to the inner sand provided on the upper frame 10. It can be selectively connected to either one of the supply port 36 and the outer sand supply port 37, whereby a sand supply port for filling the molding space with the foundry sand,
The inner sand supply port 36 and the outer sand supply port 37 can be arbitrarily selected and set. That is, in the present embodiment, the drive cylinder mechanism 74 that reciprocally drives the first sand storage tank 50 in the arrangement direction of the sand supply ports in the upper frame 10.
Including, the supply port selecting means for switching the sand supply ports 36 and 37 to the molding space is configured.

A seal plate 78 extending toward one side in the moving direction of the first sand storage tank 50 is fixed to the opening of the tip of the blow port 70, as shown in FIG. When the blow port 70 is connected to the outer sand supply port 37, the seal plate 78 allows the inner sand supply port 3
When 6 is closed, the molding sand is prevented from leaking out from the inner sand supply port 36. It is also possible to provide a seal plate that closes the outer sand supply port 37 when the blow port 70 is connected to the inner sand supply port 36. However, as shown in FIG. When the squeeze plate 19 is connected to the inner sand supply port 36, the height of the model is generally low, and the squeeze plate 19 is inserted to a position deeper than the outer sand supply port 37 (on the pattern plate side). By this, leakage of foundry sand from the outer sand supply port 37 can be prevented.

Therefore, also in the present embodiment having such a structure, the sand supply port can be changed according to the size of the model and the like in the same manner as in the above-mentioned embodiment, and various molds can be formed. The sand storage tank 5 can be advantageously dealt with, and particularly in the present embodiment.
Since it is not necessary to provide a plurality of blow ports 70 for 0, the structure of the sand storage tank 50 is simplified, and the partition plate is projected into the molding sand to blow the blow ports 7
Since it is not necessary to shut off 0, it is possible to advantageously avoid the occurrence of defective operation due to the biting of the foundry sand into the operating portion, and there is also the advantage that stable operability is ensured.

Further, FIG. 11 shows a main part of a frameless mold making machine as a third embodiment of the present invention. Also in this embodiment, as in the second embodiment, detailed description of members and the like having the same structure as the first embodiment will be omitted.

That is, in this embodiment, the upper frame 10
The opening width of the inner sand supply port 36 provided in the inner sand supply port 36 is larger than that of the inner blow port 54 of the first sand supply tank 50 connected to the inner sand supply port 36 in the axial direction of the upper frame 10. It is expanded to the mouth 37 side and set larger. Specifically, in this embodiment, the opening width B2 in the axial direction of the upper frame 10 at the inner sand supply port 36 is set to be approximately twice the opening width B1 of the inner blow port 54. The opening width of the outer sand supply port 37 is substantially the same as the opening width of the outer blow port 56.

Further, at the tip opening portions of the inner and outer blow ports 54, 56 in the first sand supply tank 50, there are low friction sliding members having through holes 79, 79 for opening the blow ports 54, 56. The moving plate 80 is attached,
The inner and outer blow ports 54, 56 are slidably abutted on the outer peripheral surface of the upper frame 10 via the sliding plate 80, and the first sand supply tank 50 is illustrated. It is reciprocally movable in the horizontal direction, which is the axial direction of the upper frame 10, by a cylinder mechanism or the like. The sliding plate 80 and the inner and outer blow ports 54, 56 are relatively displaced with respect to the inner and outer blow ports 54, 56 so that the inner and outer blow ports 54, 5 are not displaced.
A shutter plate 82 that can simultaneously open and close 6 is interposed.

Therefore, in this embodiment, the blow ports 54 and 56 inside and outside the first sand storage tank 50 are
Both are sand supply ports 36, 3 inside and outside the upper frame 10.
By moving the first sand storage tank 50 in the axial direction of the upper frame 10 from the state shown in FIG. 11 connected to the outer blow port 5, as shown in FIG.
6 and the outer sand supply port 37 can be blocked, and only the communication state between the inner blow port 54 and the inner sand supply port 36 can be maintained. That is, in this embodiment, a mechanism for reciprocating the first sand storage tank 50, and inner and outer blow ports 54, 56 and inner and outer sand supply ports 36, 37 formed with a predetermined relative opening width relationship are included. A supply port selection means for switching the sand supply port to the molding space is configured.

Therefore, also in this embodiment having such a structure, as in the first embodiment, the sand supply port can be changed according to the size of the model, and various molds can be used. It is possible to respond favorably to the manufacture of
Moreover, especially in the present embodiment, the sand supply port for filling the molding space with the molding sand can be switched by simply sliding the sand storage tank 50, which simplifies the structure of the device and There is an advantage that stabilization of operation and improvement of durability are achieved advantageously.

In the third embodiment, the opening width of the inner sand supply port 36 provided in the upper frame 10 is set larger than that of the inner blow port 54 of the first sand supply tank 50. Instead, as shown in FIGS. 13 and 14, the inner blow port 54 of the first sand supply tank 50.
It is also possible to set the opening width B1 'of the inner sand supply port 36 of the upper frame 10 to be larger than the opening width B2' of the inner sand supply port 36, whereby the same operation as the third embodiment can be achieved. -The effect can be exhibited.

Furthermore, as shown in FIGS. 15 and 16, the opening width B1 ″ of the inner sand supply port 36 provided in the upper frame 10 and the inner blow port of the first sand supply tank 50. The opening width: B2 ″ of 54 is set to be substantially the same, while the opening width: B3 of the through hole 79 of the sliding plate 80 connecting the inner sand supply port 36 and the inner blow port 54 is set to B1 ″.
It is also possible to set larger than B2 ″ and B2 ″ and to slide only the sliding plate 80 by the drive cylinder 81. If such a configuration is adopted, the same effect as the third embodiment can be obtained. In addition to being exhibited, there is no need to move the large sand storage tank 50, which has the advantage of further simplifying the device structure.

13 to 16, the same reference numerals as those in the third embodiment are used in the drawings for the members and parts having the same structures as those in the third embodiment. Therefore, detailed description will be omitted.

The embodiments of the present invention have been described in detail above, but these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, in the above-described embodiment, the two sand supply ports 36 and 37, which are located at a predetermined distance in the axial direction, are provided for the upper frame 10 and the lower frame 12, but
Forming three or more sand supply ports, one of them,
It is also possible to selectively use two or more sand supply ports.

Further, in the first embodiment, instead of the outer blow port 56 side, or in addition to the outer blow port 56 side, a partition plate is disposed on the inner blow port 54 side so as to project / retract. Thus, the filling of the foundry sand through the inner sand supply port 36 may be controlled.

Further, in the above-mentioned embodiment, the casting sand is made downward while utilizing gravity also under the condition that the pair of molds are superposed in the horizontal direction, 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 configured to blow-fill into a molding space, is shown. In a state, it is similarly applicable to a horizontal blow type molding machine or the like in which the molding sand is blow-filled with the molding sand through the sand supply port which is opened in the horizontal direction.

In such a horizontal blow molding machine or the like, it is not always necessary to form the sand supply port in the mold on the same side surface of the mold.

Further, in the mold making machine of the above-mentioned embodiment, a plurality of sand supply ports are provided in both upper and lower molds, but the height of the model used on only one mold side is greatly different. In such a case, a plurality of sand supply ports may be provided in only one of the molds so that the sand supply port can be selected.

In addition, the mold and the molding machine used in the method of the present invention are not limited to those of the above-mentioned embodiment. Specifically, in each of the above-described examples, a mold and a molding machine each having a structure for selecting a sand supply port to be used from a plurality of sand supply ports provided for position fixing were used. However, in addition to this, for example, the sand supply port for filling the molding space with the molding sand is slidable in the axial direction of the mold and can be set at an arbitrary position, or a molding machine. It is also possible to carry out the method of the present invention by employing

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing a frameless mold making machine having an upper frame and a lower frame as an embodiment of 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 view showing enlarged main parts of the frameless mold making machine shown in FIG.

FIG. 9 is an explanatory view showing a main part structure of a frameless mold making machine as a second embodiment of the present invention.

FIG. 10 is an explanatory view showing another operating state of the frameless mold making machine shown in FIG. 9.

FIG. 11 is an explanatory diagram showing a main part structure of a frameless mold making machine as a third embodiment of the present invention.

FIG. 12 is an explanatory diagram showing another operating state of the frameless mold making machine shown in FIG. 11.

FIG. 13 is an explanatory diagram showing a main part structure of a frameless mold making machine as a fourth embodiment of the present invention.

FIG. 14 is an explanatory view showing another operating state of the frameless mold making machine shown in FIG.

FIG. 15 is an explanatory diagram showing a main part structure of a frameless mold making machine as a fifth embodiment of the present invention.

16 is an explanatory view showing another operating state of the frameless mold making machine shown in FIG. 15. FIG.

[Explanation of symbols]

 10 Upper Frame 12 Lower Frame 28 Model 34 Molding Space 36 Inner Sand Supply Port 37 Outer Sand Supply Port 38 Cast Sand 40 Upper Mold 42 Lower Mold 50 First Sand Storage Tank 52 Second Sand Storage Tank 54 Inner Blow Port 56 Outside Blow port 64 Partition plate 66 Double-acting cylinder mechanism 70 Blow port 74 Drive cylinder mechanism 79 Through hole 80 Sliding plate

Claims (8)

[Claims] 1. A pattern plate is superposed on one opening side end of a mold having a tubular frame shape to close the one opening, and at the other opening side end of the mold. A squeeze plate is inserted to cover the other opening to form a molding space inside the mold, and the molding space is filled with molding sand through a sand supply port provided in the peripheral wall of the mold. When molding a frameless mold by doing, the position of the sand supply port for filling the molding space with casting sand, depending on the pattern plate, to change the insertion direction of the squeeze plate in the mold Characteristic frameless mold making method. 2. A tubular frame-shaped body, wherein a pattern plate is superposed on one opening side end to close the one opening and a squeeze plate is inserted from the other opening side end. To cover the other opening to form a molding space inside, and a sand mold supply port for filling the molding space with foundry sand is provided in the peripheral wall for frameless mold molding. In the mold, a plurality of sand supply ports are provided so as to be separated from each other in the insertion direction of the squeeze plate. 3. The frame for moldless mold making according to claim 2, wherein the plurality of sand supply ports are provided on the same side surface of the peripheral wall portion. 4. A pair of cylindrical frame-shaped molds sandwiching a pattern plate are overlapped and held, and a squeeze plate is fitted into each of the outer openings of the respective molds to form both molds. While forming a predetermined molding space inside, by molding sand into the molding space through a sand supply port provided in the peripheral wall of each mold and compacting, a pair of frameless molds is molded. In a frame-type mold making machine, a plurality of sand supply ports in at least one of the molds are formed apart from each other in the insertion direction of the squeeze plate, and the supply of casting sand through the plurality of sand supply ports is controlled. Then, a frameless mold making machine characterized in that a supply port selecting means for switching a sand supply port for filling the molding sand with the molding space is provided. 5. The pair of molds are configured to be horizontally stacked and held with the pattern plate interposed therebetween, and the sand supply port is provided on an upper surface of a peripheral wall portion of the molds. The frameless mold making machine according to claim 4, which is provided so as to open. 6. The supply port selecting means is provided by providing a plurality of blow ports respectively connected to the plurality of sand supply ports and guiding the foundry sand, and making at least one of the blow ports openable and closable. Claim 4 which is configured
Alternatively, the frameless mold making machine according to Item 5. 7. A blow port that is connected to any of the plurality of sand supply ports and guides the foundry sand is provided so as to be connectable / separable from the sand supply port, and the sand to which the blow port is connected. The frameless mold making machine according to claim 4 or 5, wherein the supply port selection means is configured by making the supply port changeable. 8. A plurality of blow ports that are respectively connected to the plurality of sand supply ports and guide the foundry sand are provided, and the plurality of blow ports are arranged along the outer surface of the mold to the arrangement direction of the sand supply ports. Slidable integrally with the sand supply port by the slide movement so that the connection of the blow port to the sand supply port is cut off, while the plurality of blow ports or In some of the sand supply ports, the opening width in the slide movement direction of the blow port is set to be large so that the blow port and the sand supply port are maintained in communication even if the blow port is slid and moved. The frameless mold making machine according to claim 4 or 5, wherein the supply port selection means is configured by the above.