JP5076670B2 - Frameless mold making machine - Google Patents

Description

  The present invention relates to a frameless mold making machine. More specifically, the present invention relates to a frameless mold making machine using a match plate.

  Conventionally, a mold making machine using a match plate is known (see, for example, Patent Document 1). However, there is a problem that the foundry sand on the model surface side of the match plate is often not sufficiently compressed.

Japanese Patent Laid-Open No. 6-277800, FIG.

  The present invention has been made in view of the above problems, and an object thereof is to provide a frameless mold making machine that sufficiently compresses the foundry sand on the model surface side of the match plate.

In order to achieve the above object, a frameless mold making machine according to the present invention includes a match plate, a pair of cast frames provided on both sides of the match plate, and a pair of cast frames provided on both sides of the match plate. In the frameless mold making machine, the match plate includes a pair of squeeze plates that are provided and configured to be freely inserted into the casting frame, and a casting sand supply device that supplies the casting sand into the casting frame. It has a model board and squeeze means.
The match plate is arranged in the horizontal direction or the vertical direction.
Moreover, the said foundry sand supply apparatus is a foundry sand supply apparatus provided with one foundry sand tank.
Moreover, the said foundry sand supply apparatus is a foundry sand supply apparatus provided with two foundry sand tanks, Comprising: The supply of air to each foundry sand tank is comprised separately.
Moreover, it is preferable that the trunk wall of the main body in the said sand sand tank is divided by the partition plate comprised with the porous body which has air permeability, and is made into the double structure which has a hollow chamber.
It is preferable that the porous body is a non-hydrophilic resin or a porous body of metal that does not cause rust.
Further, the cast frame provided so as to freely enter and exit rotates in a horizontal direction or a vertical direction.

  According to the present invention, since the squeeze means is built in the match plate, it can be compressed from the model surface side as well as the back surface of the mold, and the foundry sand can be uniformly pressed.

  In addition, according to the present invention, it is easy to uniformly fill the foundry sand by arranging the match plate in the vertical direction. Here, for filling the foundry sand into the casting frame, aeration filling that combines low-pressure air, fluidization in the foundry sand tank, and control of air pressure in the foundry frame is more preferable. Thereby, since excellent filling can be achieved, the mold after compression is uniformly formed.

Conventionally, the match plate is usually configured as a single plate. However, in the present invention, two model plates and a squeeze means are provided between them. The match plate of the present invention has a box shape or a rectangular parallelepiped shape, and the model plate is configured to be movable by, for example, squeeze means, for example, an actuator built in the box.
Here, in the present invention, the actuator can be a hydraulic or electric cylinder.
Here, in the present invention, the squeeze plate can be an elastic body as well as a rigid flat plate. In the present invention, the squeeze board is a concept including a block-shaped segment squeeze.
Here, the foundry sand refers to foundry sand that constitutes a mold used for casting. Regardless of natural sand or artificial sand. In the present invention, the foundry sand means not only raw sand but also gas curable foundry sand and self-hardened foundry sand.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
Embodiment 1
FIG. 1 is a schematic front view of a mold making machine used in Embodiment 1 of the present invention. FIG. 2 is a schematic plan view of FIG. In the match plate 1 arranged in the horizontal direction in FIG. 1, a squeeze means 2 is built therein. The model plates 1a and 1b are configured to be movable by the squeeze means 2. In addition, the model plates 1a and 1b can be divided and manufactured when they have complicated model surfaces. The match plate 1 is housed in a frame component 3. The upper and lower opening ends of the frame constituting member 3 are fabricated to be the lower frames 3a and 3b on the model plates 1a and 1b side having the function of a filling frame. In addition, a casting frame 4a and a casting frame 4b are provided at the upper position of the lower filling frame 3a and the lower position of the lower filling frame 3b, respectively, so that they can enter and leave. Further, on the upper and lower sides of the casting frames 4a and 4b, movable holding means 7a having the function of a squeezing frame at the back of the mold and serving as the squeeze plates 6a and 6b on the upper framing frames 5a and 5b. 7b are provided. Further, squeeze plates 6a and 6b are stored in the holding means 7a and 7b so that they can be fitted into the casting frame. Furthermore, the holding means 7a and 7b are provided with actuators 8a and 8b for operating the squeeze plates 6a and 6b. On the other hand, a casting sand inlet (not shown) is provided on the left side wall of the casting frames 4a and 4b, and is further communicated with a foundry sand tank (not shown) constituting a foundry sand supply device (not shown). ing.
In FIG. 1, casting frames 4c and 4d show the casting frames waiting at the rotational position R1, and further, on the right side, a mold station N is provided, and a mold 10a formed by the plate 9 from above. 10b can be extracted from the casting frames 4e and 4f to the receiving plate 9a.
The casting frame can be repeatedly rotated and stopped at least between two positions of the molding station M and the molding station N. However, in the present embodiment, as shown in FIG. The rotation position R1, the molding station M, the rotation position R2, and the die cutting station N are sequentially rotated and stopped repeatedly.

Hereinafter, the movement when these configurations are used will be described. In the molding station M of FIG. 2, the casting frame is rotated by an actuator not shown in FIG. 1, and the lower frame 3a, the casting frame 4a, and the upper frame 5a are overlapped, and the squeeze plate 6a and the model plate 1a Define the mold molding space. On the other hand, similarly, the lower frame 3b, the casting frame 4b, and the upper frame 5b are overlapped to define a molding space for the lower mold by the squeeze plate 6b and the model plate 1b.
Next, the molding space is filled with foundry sand by applying compressed air to the foundry sand tank. Thereafter, the actuators 8a and 8b fixed to the holding means 7a and 7b are operated, and the foundry sand is compressed by the squeeze plates 6a and 6b. The model plates 1a and 1b are operated by the squeeze means 2 at least during compression of the squeeze plates 6a and 6b. Thereby, like the back of the mold, compression is possible from the model surface side, and the foundry sand can be uniformly pressurized.
In particular, by moving the model plates 1a and 1b simultaneously with the squeeze plates 6a and 6b, not only a uniform mold can be formed, but also the compression time can be reduced to half of the conventional time. That is, the mold molding cycle time can be extremely shortened.
Next, by actuating the actuators 8a and 8b, the squeeze plates 6a and 6b are retracted from the back of the mold and stored in the holding means 7a and 7b. Then, the squeeze means 2 is operated to separate the mold and the model plates 1a and 1b. Thereafter, the casting frames 4a and 4b containing the casting mold are rotated in the horizontal direction by an actuator (not shown) and rotated to the rotation position R2. At this time, the casting frames 4c and 4d that were at the rotational position R1 move to the molding station M. Further, the casting frame at the rotational position R2 is rotated, and in the punching station N, the molds 10a and 10b formed by the plate 9 from above are punched from the casting frame.

As is clear from the above description, the first embodiment of the present invention has the squeeze means built in the match plate, so that it can be compressed from the model surface side as well as the back of the mold, and the foundry sand can be made uniform. Can be pressurized.
Embodiment 2

FIG. 3 is a schematic front view of another mold making machine used in Embodiment 2 of the present invention. 4 is a schematic side view of FIG. In the match plate 21 arranged in the vertical direction in FIG. 3, squeeze means 22 is incorporated. The model plates 21 a and 21 b are configured to be movable by the squeeze means 22. In addition, the model plates 21a and 21b can be manufactured by dividing them when they have complicated model surfaces. The match plate 21 is housed in a frame constituent member 23. The open end of the frame component member 23 at the left and right positions is made to be the underlay frames 23a and 23b on the model plates 21a and 21b side having the function of a fill frame. Further, cast frames 24a and 24b are provided on the opening side of the lower overlay frames 23a and 23b so as to be freely inserted and removed. Furthermore, the right position of the casting frame 24a and the left position of the casting frame 24b are movable so as to serve as the upper framing frames 25a and 25b on the squeeze plates 26a and 26b side having the function of the squeezing frame at the back of the mold. Holding means 27a and 27b are provided. Further, squeeze plates 26a and 26b are stored in the holding means 27a and 27b so as to be fitted into the casting frame. Furthermore, the holding means 27a and 27b are provided with actuators 28a and 28b for operating the squeeze plates 26a and 26b. On the other hand, on the upper side walls of the casting frames 24a and 24b, a casting sand inlet (not shown) is provided, and is further communicated with casting sand tanks T and T constituting a casting sand supply device.
In FIG. 4, casting frames 24c and 24d show the rotating casting frames. Further, a die cutting station N is provided below the casting frames 24c and 24d, and casting molds 30a and 30b formed by the plate 29 from the right are cast. It is configured so that it can be removed from the frames 24e, 24f.

  The casting frame can be repeatedly rotated and stopped between at least two positions of the molding station M and the molding station N. However, in this embodiment, as shown in FIG. The rotation position R1, the molding station M, the rotation position R2, and the die cutting station N are sequentially rotated and stopped repeatedly.

Hereinafter, the movement when these configurations are used will be described. In the molding station M in FIG. 4, the casting frame is rotated by an actuator (not shown in FIG. 3), and the lower frame 23a, the casting frame 24a, and the upper frame 25a are overlapped with each other by the squeeze plate 26a and the model plate 21a. Define the mold molding space. On the other hand, similarly, the lower mold frame 23b, the casting frame 24b, and the upper frame 25b are overlapped to define a molding space for the lower mold by the squeeze plate 26b and the model plate 21b.
Next, by applying compressed air to the foundry sand tanks T and T, the molding space is filled with foundry sand. Thereafter, the actuators 28a and 28b fixed to the holding means 27a and 27b are operated, and the foundry sand is compressed by the squeeze plates 26a and 26b. The model plates 21a and 21b are operated by the squeeze means 22 at least during compression of the squeeze plates 26a and 26b. Thereby, like the back of the mold, compression is possible from the model surface side, and the foundry sand can be uniformly pressurized.
In particular, by moving the model plates 21a and 21b simultaneously with the squeeze plates 26a and 26b, not only a uniform mold can be formed, but also the compression time can be reduced to half of the conventional time. That is, the mold molding cycle time can be extremely shortened.
Next, by actuating the actuators 28a and 28b, the squeeze plates 26a and 26b are retracted from the back surface of the mold and stored in the holding means 27a and 27b. Then, the squeeze means 22 is operated to separate the mold and the model plates 1a and 1b. Thereafter, the casting frames 24a and 24b containing the mold are rotated in the vertical direction (vertical direction) by an actuator (not shown), and are rotated to the rotation position R2. At this time, the casting frames 24c and 24d at the rotational position R1 move to the molding station M. Further, the casting frame at the rotational position R2 is rotated, and at the cutting station N, the molds 30a and 30b formed by the plate 29 from the right are removed from the casting frame, and the molds 30a and 30b are horizontally placed by the mold upright device 31. It is rotated to become.

  As is apparent from the above description, in the second embodiment, since the squeeze means is built in the match plate, it can be compressed from the model surface side as well as the back of the mold, and uniformly presses the foundry sand. be able to.

Next, an embodiment of the foundry sand supply apparatus applied to the present invention will be described, but the present invention is not limited to such an embodiment. In order to make the explanation easy to understand, as shown in FIG. 5, the foundry sand supply apparatus 51 according to the present embodiment describes the foundry sand tank T on the left side of FIG. 3, and the foundry sand tank on the right side of the page. A description of T will be omitted.
The foundry sand supply device 51 has a double structure in which the entire body wall 51a of the main body is partitioned by two sets of upper and lower breathable partition plates 52 and 53, and two upper and lower hollow chambers 54 and 55 are formed by a partition portion Ta. In addition, two foundry sand tanks T, each of which has two lower left and lower hollow chambers at the bottom, an auxiliary frame 56 attached to the lower end of the outer periphery of the foundry sand tank T, and the two hollow chambers 54 and 55 are comprised of two on-off valves 57 and 58 for communicating a compressed air source (not shown). A sand supply hole 61 that is opened and closed by a slide gate 60 is provided in the upper part of the casting sand tank T, and two sand injection ports Tb are formed in the lower part. The partition plates 52 and 53 are attached with a seal member (not shown) interposed therebetween.
The auxiliary frame 56 is provided with exhaust control means 62 for controlling the discharge of compressed air from the auxiliary frame 56, and the exhaust control means 62 is attached to the outer periphery of the upper part of the auxiliary frame 56 to assist. A frame 64 having a U-shaped cross section forming an airtight hollow chamber 63 with the frame 56, a plurality of on-off valves (not shown) for opening and closing the hollow chamber 63 with respect to the atmosphere, and the auxiliary frame 56 A plurality of pores 65 are provided to allow the compressed air of the auxiliary frame 56 to be discharged into the hollow chamber 63.
The partition plates 52 and 53 are not particularly limited in the present invention, but are preferably a non-hydrophilic resin or a porous metal that does not generate rust. The non-hydrophilic resin is a resin that does not absorb water and has any strength and hardness that does not cause deformation or breakage during mounting. The metal may be anything as long as it does not rust due to moisture, and any material can be used as long as it has a required strength.
The partition plates 52 and 53 are preferably resin plates having an average pore diameter of 10 to 500 μm and a large number of through holes smaller than the particle diameter of the sand particles and a thickness of 5 to 20 mm. Has an average pore diameter of 10 to 50 μm. If the thickness is less than 5 mm, the air is deformed by compressed air, and if it exceeds 20 mm, the pressure loss of the compressed air increases and the foundry sand is difficult to fluidize. Further, the through hole preferably has a hole density of 25 to 50%, more preferably 30 to 45%. In addition, when the partition plates 52 and 53 are metals, the manufacturing method of a porous body is not ask | required, For example, a sintering method may be sufficient.

  Next, in the mold making machine of the second embodiment, a procedure for blowing and filling foundry sand into a predetermined mold making space from the state shown in FIG. 5 will be described. First, the casting frame and the upper building frame are overlaid on the lower building frame, and the auxiliary frame 56 is lowered toward the charging port provided in the casting frame and overlaid on the casting frame.

  Next, after the sand supply hole 61 of the foundry sand supply device 51 is closed by the slide gate 60, the on-off valves 57 and 58 are opened to supply compressed air to the hollow chambers 54 and 55, respectively, The low pressure compressed air is injected from 53 into the foundry sand tank T of the foundry sand supply device 51 to fluidize the foundry sand in the foundry sand tank T and pressurize the upper surface of the foundry sand. In particular, by fluidizing the lower hollow chamber of the foundry sand tank T, the resistance to the inner surface of the lower hollow chamber of the foundry sand can be reduced.

  Further, at the same time that the on-off valves 57 and 58 are opened, a plurality of on-off valves of the exhaust control means 62 are appropriately opened and closed to adjust the discharge of compressed air from the auxiliary frame 56, and the casting that is ejected from the sand injection port Tb. The speed of sand is increased or decreased, and the exhaust speed from a vent plug (not shown) embedded in the model board is controlled. Thereby, the air pressure in the casting frame is controlled, and the filling density of the foundry sand in the mold making space can be partially adjusted. As a result, the foundry sand is properly aerated and filled in a required state to every corner of the mold making space.

  The foundry sand supply apparatus 51 in the present embodiment includes two foundry sand tanks T for application to the second embodiment. However, in the present invention, the present invention is not limited to this. In order to apply to the first aspect of the present invention, it is possible to appropriately change the foundry sand supply device so as to include one foundry sand tank.

1 is a schematic front view of a mold making machine used in Embodiment 1 of the present invention. FIG. 2 is a schematic plan view of FIG. 1. It is the front schematic of the mold making machine used for Embodiment 2 of this invention. FIG. 4 is a schematic side view of FIG. 3. It is a schematic longitudinal cross-sectional view which shows the principal part of the foundry sand supply apparatus applied to this invention.

Explanation of symbols

1, 21 Match plate 1a, 1b, 21a, 21b Model plate 2, 22 Squeeze means 4a, 4b, 24a, 24b Cast frames 6a, 6b, 26a, 26b Squeeze plate

Claims (7)

Match plate,
A pair of cast frames provided on both sides of the match plate so as to freely enter and exit;
A squeeze plate that is provided outside the opening of each casting frame and is configured to be freely inserted into the casting frame;
A foundry sand supply device for supplying foundry sand into the casting frame;
In a frameless mold making machine comprising:
The match plate, as well as having a pair of pattern plate, Ri Na incorporates a squeeze means movable toward the pattern plate to said squeeze plate,
The match plate is arranged in a horizontal direction or a vertical direction,
The frameless mold making machine is characterized in that the foundry sand supply device includes one foundry sand tank . 2. The frameless mold making machine according to claim 1 , wherein the body wall of the main body of the foundry sand tank is partitioned by a partition plate made of a porous body having air permeability and has a double structure having a hollow chamber. The sand supply device is a sand supplying apparatus including two molding sand tank, to claim 1, characterized in that the supply of air to the molding sand tank is configured to be made separately The frameless mold making machine described. 4. The frameless mold making machine according to claim 3 , wherein a body wall of the main body of the foundry sand tank is partitioned by a partition plate made of a porous body having air permeability and has a double structure having a hollow chamber. The frameless mold making machine according to claim 2 or 4 , wherein the porous body is a non-hydrophilic resin or a porous body of a metal that does not generate rust. The frameless mold making machine according to claim 1 , wherein the cast frame provided so as to freely enter and exit rotates in a horizontal direction. The frameless mold making machine according to claim 1 , wherein the cast frame provided so as to freely enter and exit rotates in a vertical direction.