JPH0441047A - Mechanism for changing sprue position in molding machine - Google Patents

Abstract

PURPOSE:To quickly execute change of sprue forming position and to improve molding cycle by arranging a movable plate facing to a pattern plate as turnable in one side of compressed disks and further, driving means for turning the movable plate at the prescribed position and standing a sprue rod to the movable plate. CONSTITUTION:At the time of changing the sprue position in the molding time, switch mechanism 78 is operated, and by driving a motor 64 in the prescribed quantity, standing position of the sprue rod 35 in a squeezing head 19 can be suitably changed. Then, as it is unnecessary that the sprue rod 35 is taken out at each time and changed over to fitting, the change of position for forming the sprue is quickly executed under good workability.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a sprue position changing mechanism for changing the formation position of a sprue in a mold manufactured by a mold making machine.
In particular, the present invention relates to a new sprue position changing mechanism that allows the sprue formation position to be changed easily and quickly.

(Background technology) Conventionally, as a type of mold making machine that compacts foundry sand in a flask to form a casting mold, a pair of molding machines are placed on both sides of a pattern plate with an integrally formed pattern in between. By overlapping the frames (upper frame and lower frame) and fitting compression discs into the outer openings of each flask and covering them, a predetermined molding space is formed within the flasks, and the molding BACKGROUND ART It is known that a target mold (an upper mold and a lower mold) having a casting cavity having a shape corresponding to the model is obtained by compacting the molding sand filled in the space.

In such a mold making machine, a rod-shaped sprue rod that extends toward the pattern plate is normally installed on either side of the compression plate that is fitted into the outer opening of the flask. With the sprue rod in contact with the pattern plate, the above-described molding operation is performed, and then the sprue rod is pulled out of the mold, thereby forming a sprue that communicates with the casting cavity formed in the mold. A sprue for hot water is formed.

However, in the case of such a sprue, the formation position of the sprue is determined as appropriate depending on the size and shape of the casting cavity formed in the mold.
Each time the pattern plate (model) was changed when changing the mold, it was necessary to remove the sprue rod from the compression plate and place it in a different position. In addition to being troublesome, there was a problem in that there was a large time loss when changing the mold, and the molding cycle was reduced.

Therefore, conventionally, it has been proposed, for example, to place sprue rods upright on the pattern plate at positions corresponding to each model. However, even when the sprue rod is provided on the pattern plate side in this way, the sprue cup part (the receiving pan forming part) cannot be formed on the pattern plate side because the draft angle is reversed. However, in this case, a plurality of sprue cup portions must be formed at positions corresponding to the positions of the sprue rods on the various pattern plates. As a result, a plurality of unnecessary cup portions (water receivers) are formed in the resulting mold, and these unnecessary cup portions cause thinning of the casting cavity wall. As a result, there was a problem in that the moldability of the mold was adversely affected.

In addition, piston-type sprue rods that can be retracted/extended by a piston mechanism are installed at multiple positions on the compression plate, and the appropriate sprue rod can be used to protrude depending on the model of the pattern plate to be used. A new version has also been proposed. However, even with such a piston-type sprue rod, due to its structure, it is extremely difficult to completely store even the sprue cup part in the compression plate. Although the formation of unnecessary cup portions can be avoided, as in the case where a sprue rod is provided on the pattern plate side as described above, there is a problem in that the moldability of the mold is adversely affected.

(Problem to be solved) Here, the present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is:
An object of the present invention is to provide a sprue position changing mechanism in a mold making machine that allows the sprue position to be changed quickly and with excellent workability without adversely affecting the moldability etc. when changing the mold. .

(Solution Means) In order to solve this problem, in the present invention, a pair of molding flasks are stacked on both sides of a pattern plate in which a model is integrally formed, and each molding flask is stacked on both sides of the pattern plate. By fitting compression discs into the outer openings of the flasks and covering them, a predetermined molding space is formed within the flasks, and the filled molding sand is compacted within the molding space. In a mold making machine that makes a predetermined mold, a movable plate facing the pattern plate is provided on the one compression plate so as to be movable in a plane parallel to the pattern plate, and the movable plate is moved in a predetermined manner. A driving means is provided for moving the movable plate to the position of the pattern plate,
The present invention is characterized by a sprue position changing mechanism in a mold making machine, which comprises a sprue rod that is erected to form a sprue in the mold by being brought into contact with the pattern plate.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 schematically shows a specific example of a mold making machine equipped with a sprue rod constructed according to the present invention. In this figure, 10 and 12 are an upper frame and a lower frame as a casting flask, and are supported by a guide bar 14 so as to be movable toward and away from each other. Further, these upper frame 10 and lower frame 12 are supported by a support metalwork 6 via a guide bar 14, and together with the support base 16 by a reversing cylinder 18, the upper frame 10 and the lower frame 12 are rotated approximately 90 degrees in the direction of the arrow in the figure. It is designed so that it can be rotated as a unit. As shown by the imaginary lines in the figure, at the rotational position of the support base 16 where the upper frame 10 and the lower frame 12 are superimposed in the horizontal direction, the upper frame 10 and the lower frame 12 An upper squeeze device 20 and a lower squeeze device 22 each having a squeeze head 19 as a compression plate are disposed on both sides in the overlapping direction, and the upper frame 10 and the lower frame 12
A blowing device 32 is disposed above, and the upper frame 10 and lower frame 12 are vertically overlapped, as shown by solid lines in the figure. In the rotating position of the support base 16, a mold wave device 24 and a mold receiving device 26 are respectively disposed on both sides of the upper frame 10 and the lower frame 12 in the overlapping direction.

When molding a mold using a mold making machine having such a structure, first, the support base 16 is placed in the rotating position shown by the solid line in FIG.
As shown in FIG. 2, a model 28 molded into the required casting shape is integrally formed in the center between the opposing surfaces of the upper frame 10 and the lower frame 12 by a pattern transfer device (not shown). A pattern plate 30 consisting of 8 pieces is guided and positioned, and 8 pieces of pattern plates 30 are sandwiched between them.
The frame 10 and the lower frame 12 are overlapped.

After that, as shown in FIG. 2(b), the support stand 16
are rotated to the rotational positions as shown by imaginary lines in FIG. 1, and the upper squeeze device 20 and lower squeeze device 22 squeeze heads 19.19 are fitted and the openings are covered, thereby creating a predetermined molding space 34.3 inside the upper frame 10 and lower frame 12.
4 is formed. Further, a sprue rod 35 is provided upright on the squeeze head 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.

Under such conditions, the molding sand 3 is supplied from the blowing device 32 into the molding spaces 34, 34 of the upper frame 10 and the lower frame 12 through the inlet holes 36, 36 provided in the upper frame 10 and the lower frame 12.
After filling the molding space 34, 34 with the molding sand 38, the upper and lower squeeze devices are used.
Both squeeze heads 19.19 in 20.22 are displaced toward each other with a predetermined pressure,
By compressing the molding sand 38 into a mold, an upper mold 40 and a lower mold 42 as molds are respectively formed (see FIG. 2(C)).

As shown in FIG. 2(C), after forming the upper mold 40 and the lower mold 42, the upper and lower squeeze devices 2
The squeeze head 19.19 at 0.22 is released from the mold, and at the same time as the compression platen 19.19 is released, the sprue rod 35 is also removed from the mold, so that the squeeze head 19.19 is released into the upper mold 40. A sprue 43 having a shape corresponding to the sprue rod 35 is formed.

Furthermore, after the squeeze head 19, 19 is released from the mold, the support base 16 is rotated to the rotational position as shown in solid lines in FIG. 1, and as shown in FIG. 2(d). By separating the upper frame 10 and the lower frame 12 as shown, the pattern plate 30 having the model 28 is cut out from the upper mold 40 and the lower mold 42. As is well known, when performing such die cutting, the pattern plate 30 is usually ejected by a predetermined amount by an ejecting mechanism (not shown) provided on the upper frame 10 and the lower frame 12. pattern plate 30
The mold cutting from the upper mold 40 and the lower mold 42 will be performed simultaneously.

Then, after removing the pattern plate 30 and inserting the core as necessary, the upper frame 10 and the lower frame 12 are reattached as shown in FIGS. 2(e) and 2(f). The upper mold 40 and the lower mold 4 are superimposed by the mold wave device 24.
2 are overlapped, the upper frame 10 and the lower frame 1
2, a target frameless type is formed in which a casting cavity 44 of a predetermined shape and a sprue 43 communicating with the casting cavity 44 are formed inside by cutting a mold onto the mold receiving device 26. As a result, a mold of 100% is obtained.

By the way, as shown in FIGS. 3 and 4, the squeeze head 19 of the upper squeeze device 20 in the mold making machine having such a structure has a movable section on the surface on the pattern plate 30 side. Rotating plate 44 as a plate
is arranged, and for such rotating plate 44,
The sprue rod 35 is attached.

More specifically, the rotary plate 44 is formed in the shape of a disk, and integrally has a rotary shaft 46 projecting a predetermined length on one side in the axial direction. The rotating shaft 46 is connected to the squeeze head 19 and the pattern plate 3.
The squeeze head 19 extends in a direction opposite to the
The rotary plate 44 is fitted into the inside and rotatably supported, so that the rotating plate 44 is attached to the surface (front) 5 of the squeeze head 19 on the pattern plate 30 side.
On the other hand, it is arranged so as to be rotatable around an axis in a plane parallel to the pattern plate.

Further, a piston member 48 is fitted and identified in the axially intermediate portion of the rotating shaft 46 in the rotating plate 44, while a rotating shaft supporting member 50 is fitted on the squeeze head 19 side.
．． A cylinder chamber 56 is formed by 52 and 54, and the cylinder chamber 56 is formed by the piston member 48 and the cylinder chamber 56 based on the switching operation of the air valve 59.
An air piston mechanism is configured to displace the rotary shaft 46 by a predetermined dimension in the axial direction by supplying and discharging pressurized air into the rotary shaft 46 .

That is, based on the operation of such an air piston mechanism,
The rotating plate 44 is attached to the front surface 5 of the squeeze head 19.
In this abutting state, the rotary plate 44 is brought into close contact with the front surface 58 of the squeeze head 19 with the annular seal rubber 60 in between. While molding sand and the like are prevented from entering the gap and the rotational resistance force of the rotating plate 44 can be exerted, under the separated state, the rotational operation of the rotating plate 44 is performed under small sliding resistance. It has become acceptable.

By screwing the sprue rod 35 onto the rotary plate 44 mounted on the squeeze head 19 in this manner, the pattern plate 30 is positioned at a position deviated by a predetermined dimension from the center of rotation of the rotary plate 44. It is placed upright and protrudes to the side. Thereby, the protruding position of the sprue rod 35 on the squeeze head 19 is determined based on the rotation of the rotary plate 44, on one circumference (A) around the rotation center of the rotary plate 44.
It is considered movable.

Further, a gear 62 is non-rotatably mounted on the protruding end of the rotating shaft 46 of the rotating plate 44. A motor 64 serving as a driving means is connected to this gear 62.
A pinion 68 attached to the drive shaft 66 of the motor 64 is meshed with the drive shaft 66, and the rotational driving force of the motor 64 is transmitted through gear means to
The rotary shaft 46 of the rotary plate 44 is affected, and the rotational position of the rotary plate 44 can be changed as appropriate based on the rotational operation of the motor 64. be. In addition, in Figure 3, 7
0 is a protective sleeve that covers the drive shaft 66 of the motor 64. In addition, an expansion joint mechanism is provided at the axially intermediate portion of the drive shaft 66 and the protective sleeve 70 as required, so that the motor 64 can be placed in the mold as described above while the installation position of the motor 64 is fixed. This means that displacement of the squeeze head 19 during molding is allowed.

Furthermore, a pinion 72 is attached to the base side of the drive shaft 660 of the motor 64.
2, a gear 76 equipped with a detection plate 74 is meshed with the detection plate 74, so that the detection plate 74 is rotated in accordance with the rotation of the drive shaft 66 of the motor 64. Then, by detecting the signal set on the detection plate 74 with a switch mechanism 78 that is made to run on the outer peripheral surface of the detection plate 74, the drive shaft 66 of the motor 64 and, by extension, the rotation plate 44 are rotated. The rotational position is detected and can be controlled.

Therefore, in a mold making machine equipped with a sprue position changing mechanism structured as described above, even if the sprue formation position is required to be changed when changing the mold, the motor 64 can be turned on by operating the switch mechanism 78. By rotating the sprue rod 35 by a predetermined amount, the standing position of the sprue rod 35 in the squeeze head 19 can be changed as appropriate.
Since it is not necessary to remove or replace the sprue 5 one by one, the position where the sprue is formed can be changed quickly and with good workability, and the molding cycle can be advantageously improved. It will become.

In addition, since this sprue position changing mechanism changes the standing position of a single sprue rod 35, unlike conventional sprue rods, a plurality of unnecessary cup portions (receiving pans) are added to the mold. ) is formed, or such a cup portion does not impede the moldability of the mold.

Furthermore, in this embodiment, the rotating plate 44 is
By separating the rotary plate 44 from the squeeze head 19 from a top equipped with an air piston mechanism that displaces the front surface 58 of the squeeze head 19 by a predetermined dimension in the abutment/separation direction, the rotary plate 44 can be moved when changing the sprue position. It has the advantage that the driving force for rotating the mold can be reduced, and by bringing the rotary plate 44 into contact with the squeeze head 19, molding sand can be effectively prevented from entering the rotating part during molding. -ing

Furthermore, by such a piston mechanism, the rotating plate 4
4 abuts against the front surface 58 of the squeeze head 19, rotation of the rotary plate is prevented and the sprue rod 35 can be positioned advantageously.

Next, FIG. 5 shows another embodiment of a mold making machine equipped with a sprue position changing mechanism structured according to the present invention. In this embodiment, members having the same structure as those in the first embodiment are designated by the same reference numerals, and detailed explanation thereof will be omitted.

That is, in this embodiment, the squeeze head 19 in the upper squeeze device is formed with a hollow structure having a hollow cavity 80 inside. A circular arrangement hole 82 is provided on the side of the squeeze head 19 facing the pattern plate, and the head 19 is fitted into the arrangement hole 82 to cover the arrangement hole 82. A disc-shaped rotary plate 44 on which a sprue rod 35 is erected and fixed is disposed.

Further, the rotary plate 44 is rotatable around the central axis within the installation hole 82, and as in the first embodiment, the rotary shaft 46 is connected to the rotary drive means 84.
It is guided to a predetermined rotational position by being rotated by.

Further, the squeeze lent 19 is provided with an air supply hole 86 passing through its wall, and compressed air is supplied into the hollow cavity 80 through the air supply hole 86. There is. Thereby, the compressed air supplied into the hollow cavity 80 is discharged to the outside through the sliding surface between the installation hole 82 formed in the squeeze head 19 and the rotating plate 44. .

Therefore, even in a mold making machine equipped with a sprue position changing mechanism having such a structure, the standing position of the sprue rod 35 in the squeeze head 19 can be changed as appropriate by rotating the rotary plate 44. As in the first embodiment, the position of the sprue can be changed quickly and with good workability, and the molding cycle can be advantageously improved.

In addition, in this embodiment, the rotary plate 44 constitutes a part of the wall of the squeeze head 19, and the rotary plate 44 prevents the squeeze head 19 from protruding from the front surface 58. Therefore, there is no possibility that a recess is formed by the rotary plate 44 in the mold to be molded.

Furthermore, in this embodiment, since compressed air can be discharged through the sliding surface between the installation hole 82 formed in the squeeze head 19 and the rotating plate 44, such sliding The air layer formed between the surfaces can advantageously reduce the rotational resistance of the rotating plate 44, and also has the effect of effectively preventing molding sand etc. from entering between the sliding surfaces and cleaning them. That's what I'm doing.

Although the embodiments of the present invention have been described in detail above, these are literal illustrations, and the present invention is not to be construed as being limited only to these specific examples.

For example, in the embodiment described above, the motor 64 was used as a driving means for applying rotational driving force to the rotating plate 44, but it is also possible to employ various other known driving means such as a piston mechanism. .

Further, in order to more accurately control the operation of such a driving means, a servo motor or a limit switch or the like may be used as the driving means.

Furthermore, in the embodiment described above, the movable range of the sprue rod 35 was one circumference around the rotation center of the rotary plate 44, but the vertical position of the sprue rod 35 on the rotary plate 44 was It is also possible to easily expand the movable range by changing the direction.

Further, in the above embodiment, the rotary plate 44 that is allowed to rotate on the − axis is used as the movable plate, but the movement form of the movable plate is not limited to this, and other pattern plates may be used. It is also possible to use a movable plate that allows various forms of movement in parallel planes, such as rotation with an axis of rotation and an axis of revolution, or reciprocating movement (sliding movement) in a linear direction without rotation. It is possible.

In addition, the mold making machine to which the present invention is applied is not interpreted to be equally limited by the above embodiments, but is limited to various mold making machines, especially frameless mold making machines. Needless to say, any of the above can be applied to advantage.

In addition, although not listed, the present invention can be implemented in embodiments with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and the present invention can be implemented in embodiments with various changes, modifications, improvements, etc. Needless to say, all of these are included within the scope of the present invention as long as they do not depart from the gist of the present invention.

(Effects of the Invention) As is clear from the above description, the sprue position changing mechanism in the mold making machine configured according to the present invention has the following effects:
By activating the drive means and moving the movable plate by a predetermined amount, the standing position of the sprue rod on the compression plate can be changed, so it is also possible to change the sprue formation position when changing the mold. There is no need to remove or attach or replace the sprue rods one by one, and the sprue forming position can be changed quickly and with good workability, thereby advantageously improving the molding cycle. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a process explanatory diagram for explaining a mold making process in a mold making machine having a structure in accordance with the present invention in which the sprue position is closed. Furthermore, FIG. 3 is an enlarged sectional view of a main part showing a sprue position changing mechanism in the mold making machine shown in FIG. 1, and FIG. 4 is a left side view in FIG. 3. Further, FIG. 5 is a sectional view of a main part schematically showing another specific example of a sprue position changing mechanism structured according to the present invention. 10: Upper frame 19 Nice squeeze head 22: Lower squeeze device 30: Pattern plate 35: Sprue rod 40: Upper mold 44: Rotating plate 64: Motor 80: Hollow cavity 84: Rotation drive means 12: Lower frame 20: Upper squeeze device 28: Model 34: Molding space 38: Molding sand 42: Lower mold 46: Rotating shaft 66: Drive shaft 82: Installation hole 86: Air supply hole

Claims (1)

[Claims] A pattern plate with a model integrally formed therebetween,
By overlapping a pair of flasks on both sides, and fitting compression discs into the outer openings of each flask and covering them, a predetermined molding space is formed within the flasks, and the molding space is In a mold making machine that creates a predetermined mold by compacting filled molding sand, a movable plate facing the pattern plate is moved parallel to the pattern plate with respect to the one compression plate. The movable plate is provided so as to be movable in a plane, and further provided with a driving means for moving the movable plate to a predetermined position. . A sprue position changing mechanism in a mold making machine, characterized in that a sprue rod for forming a sprue is erected in the mold.