JP3573097B2 - Mold and method for producing mold - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold for casting metal and a method for manufacturing a mold, and more particularly to a mold and a method for manufacturing a mold that do not require a molding model.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a method of manufacturing a mold that can be manufactured without requiring a molding model when casting a casting having a large size and a complicated shape. There is one disclosed in Japanese Patent No. 150237.
[0003]
In this method, a sand block obtained by solidifying a granular material such as sand is directly processed by an automatic control processing machine or the like that operates a tool according to a previously input program, and this is used as a mold or a part of the mold. This is a method for producing a mold.
[0004]
By this, it is described that if data is input to the automatic control processing machine, the tool is operated based on the data, for example, according to a program called CAM, and the required shape of the mold inner surface can be processed accurately and quickly. ing.
[0005]
[Problems to be solved by the invention]
However, in the method for producing a mold, since a sand block in a state of being taken out of a wooden frame for block production is subjected to a cutting process to produce a mold, it is difficult to produce a large block, and a large press mold is used. However, there is a problem that a large mold for casting the mold cannot be manufactured.
[0006]
Further, since the mold is manufactured only by cutting from one side of the sand block, there is a problem that a mold having a portion (inverse) hidden from the machining direction cannot be manufactured.
[0007]
Then, this invention was made in view of the said problem, and an object of this invention is to provide the casting_mold | template and the manufacturing method of a casting_mold | template which can be applied also to a large casting_mold | template containing an inverse.
[0008]
[Means for Solving the Problems]
A first invention is a casting mold, which is provided with a holding frame having a plurality of transfer hooks which are engaged with a transfer means on an outer periphery, and is filled and solidified in a state where two surfaces are exposed in the holding frame. It is characterized in that a frame block is formed from a solidified kneaded material which is integrated with the holding frame and at least one surface is directly processed by the shape processing means, and the frame blocks are laminated.
[0009]
In the frame block, the solidified kneaded material and the frame are integrated, and the shape is processed in that state to form one constituent block of a mold.
[0010]
According to a second aspect, in the first aspect, at least three or more frame blocks are stacked, and at least one surface of the solidified kneaded material surface contacting between the frame blocks is
It is characterized in that each is shaped as a mold space.
[0011]
In a third aspect based on the second aspect, the frame block located in the middle of the plurality of frame blocks is turned over after one of the surfaces of the solidified kneaded material is processed by the shape processing means, and then solidified. The other surface of the kneaded material is processed by a shape processing means.
[0012]
A fourth invention is characterized in that, in any one of the first to third inventions, the holding frame body supports the solidified kneaded material by embedding a plurality of pins protruding inward into the solidified kneaded material. And
[0013]
A fifth invention is a method for manufacturing a mold, wherein a kneaded material of a powder and a solidifying agent is filled into a frame configured to be conveyable by a conveying means, solidified, and integrated with the frame. Forming a block, directly processing at least one of the solidified kneaded material surfaces of the frame block by a shape processing means, and then combining the processed frame block with another frame block to form a mold. And
[0014]
In a sixth aspect based on the fifth aspect, at least three or more of the frame blocks are laminated, and at least one surface of the solidified kneaded material contacting between the frame blocks has a shape as a mold space. It is characterized by being processed.
[0015]
In a seventh aspect based on the sixth aspect, the frame block located in the middle of the plurality of frame blocks has one of the surfaces of the solidified kneaded material processed by the shape processing means and then inverted by the transport means. And the other of the surfaces of the solidified kneaded material is processed by a shape processing means.
[0016]
An eighth invention is a method for manufacturing a mold, wherein the three-dimensional structure data of the mold is inverted between a part having data and a part not having data to form three-dimensional data of the mold, and then the three-dimensional data of the mold is optionally converted. A plurality of blocks are formed by dividing by a plane, and a part which cannot be processed from the upper and lower surface processing directions in each block is determined, and a solid constituting the part is separated from the corresponding block and united with an adjacent block. Each of the blocks thus obtained is stacked.
[0017]
【The invention's effect】
Therefore, in the first and fifth inventions, the solidified kneaded material is integrated with the holding frame to form a frame block. Can be manufactured.
[0018]
In addition, since the holding frame can be transported by the transporting means, even if the size is increased, there is no trouble in handling.
[0019]
Further, by stacking these frame blocks, an even larger mold can be formed.
[0020]
In the second and sixth inventions, in addition to the effects of the first and fifth inventions, at least one surface of the solidified kneaded material that comes into contact between the frame blocks is shaped as a mold space, respectively. A mold including an inverse can be easily formed, and a mold having a complicated shape can be manufactured.
[0021]
In the third and seventh inventions, in addition to the effects of the second and sixth inventions, the intermediate frame block is formed by processing one of the surfaces of the kneaded material by the shape processing means and then inverted by the transfer means. Since the other surface of the kneaded material is processed by the shape processing means, a mold having a more complicated shape can be manufactured.
[0022]
In the fourth invention, in addition to the effects of the first to third inventions, the kneaded material and the holding frame are integrated by a plurality of pins, so that the solidified kneaded material can be more firmly supported. , A larger frame block can be formed, which is useful for forming a large mold.
[0023]
According to the eighth aspect, the blocks of the mold can be divided into blocks corresponding to the shape of the mold in order to separate the solids constituting the unworkable part from the corresponding blocks and to combine them with the adjacent blocks. The number can be minimized.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0025]
FIG. 1 shows an example of a mold manufacturing apparatus to which the present invention is applied, a frame block forming step A, a block processing step B of shaping the formed frame block into a mold part block, and the mold part blocks are connected to each other. And a processing apparatus D for controlling the processing machine in the block processing step B.
[0026]
The processing device D stores data relating to the shape and dimensions of the three-dimensional mold, for example, data and CAD data read from drawings, and converts the mold data into a plurality of mold part block data based on the stored data. A mold division process E for conversion is performed, and the processing machine is drive-controlled based on the divided mold part block data (generally referred to as CAM (Computer Aided Manufacturing)).
[0027]
FIG. 2 shows an example of a frame block forming step A to which the present invention is applied, in which a frame block integrated with a frame provided with a transport hook is manufactured, and FIGS. 2 (A) to 2 (C) are used. It is manufactured through a process.
[0028]
In FIG. 2, as equipment used, a plate 2 serving as a base of a frame block 1, a holding frame 3 holding a solidified kneaded material 1A stacked on the plate 2, and a molding frame 1 A molding frame 4 used by being stacked on the holding frame 3 is used.
[0029]
The holding frame 3 is used for strengthening the integration of the frame 5 for reinforcing the solidified kneaded material 1A and the solidified kneaded material 1A at the time of processing after molding, at the time of transportation, at the time of assembly, at the time of completion of a mold, and the like. A plurality of pins 6 projecting inward from the frame 3 so as to be embedded in the solidified kneaded material 1A to be molded, and a frame used when the frame block 1 is transported or inverted by a transport device such as a crane. Transport hooks 7 arranged at a plurality of locations on the outer periphery of the body 3.
[0030]
Further, the molding frame 4 is used when the frame 8 is transported in the same manner as the holding frame 5 when the frame 8 is stacked on the holding frame 3 when the frame block 1 is molded. A plurality of transport hooks 9 are provided.
[0031]
Then, in the frame block forming step A, first, in FIG. 2A, the holding frame 3 and the forming frame 4 are overlapped on the plate 2 as a base (the order of stacking depends on the frame block to be formed). Different) and fixed so as not to be separated from each other to form a container for forming a frame block.
[0032]
Next, the kneaded material 1A of the foundry sand (silica sand) and the solidifying agent (phenol resin + hardening agent) is filled into the container, and the state shown in FIG.
[0033]
Then, when a sufficient compressive strength (about 3 MPa (Pascal)) is reached after the curing time has elapsed, the molded frame 4 is removed to obtain the frame block 1 of FIG. 2C.
[0034]
The solidified kneaded material 1A of the frame block 1 is firmly integrated with the holding frame 3 by a plurality of pins 6, and is protected from external impact by the plate 2 fixed to the holding frame 3. .
[0035]
The thickness of the frame block 1 can be adjusted by the amount of the kneaded material 1A of the molding sand (silica sand) and the solidifying agent (phenol resin + hardener) filled in the molding frame 4 stacked on the holding frame 3. The frame block 1 having an arbitrary thickness can be obtained.
[0036]
The frame block 1 is suspended and transported by a crane or the like using the transport hooks 7 of the holding frame 3, and is transported to the block processing step B.
[0037]
In the block processing step B, both surfaces of the frame block 1 are sequentially processed to obtain planar accuracy, and the other surface is cut with reference to one of the surfaces, and if necessary, the surface is inverted. One surface is cut with reference to the other surface.
[0038]
FIG. 3 shows an example of a mold formed by the method for manufacturing a mold according to the present invention. The first block 10 is held by a first holding frame 11 and is convex downward in the drawing. The second block 20 is held by the body 21 and processed from both sides, and the third block 30 serving as a base is held by the third holding frame 31 and the plate 32. The second block 20 is processed from both sides, and there is also a portion 20A where the inverse has been eliminated.
[0039]
Although the pins 6 are not shown in each of the blocks 10, 20, and 30 shown in the figure, they are installed as needed, and illustration and description thereof will be omitted below.
[0040]
The processing steps of the first block 10 of the mold shown in FIG. 3 will be sequentially described with reference to FIG. 4, the processing steps of the second block 20 with reference to FIG. 5, and the processing steps of the third block 30 with FIG. A method for manufacturing a mold will be described.
[0041]
The processing of the first to third blocks 10, 20, and 30 may be performed sequentially by one processing machine, or may be performed simultaneously and in parallel by a plurality of processing machines.
[0042]
The processing steps of the first block 10 will be described with reference to FIG. First, in FIG. 4 (A), the solidified kneaded material 1A held by the holding frame 11 and the plate 12 is placed on a base (not shown) of the processing machine with the surface opposite to the plate 12 as the upper surface. The upper surface of the solidified kneaded material 1A is planarized by the planar processing tool B1.
[0043]
Next, in FIG. 4 (B), the protection plate 13 is placed on the upper surface of the solidified kneaded material 1A which has been flattened, and the leg 13A of the protection plate 13 is fixed to the holding frame 11, thereby protecting the solidified kneaded material 1A. As shown in FIG. 4C, the transporting hook 11A of the holding frame 11 is turned upside down as a support point, and the protective plate 13 is placed on the base of the processing machine with the protective plate 13 facing down.
[0044]
Then, in FIG. 4D, the plate 12 is removed from the holding frame 11, the covered lower surface is exposed, and the lower surface of the solidified kneaded material 1A is planarized by the planar processing tool B1 of the processing machine in the same manner as the upper surface. I do.
[0045]
In this plane processing, since the edge portion of the plate 12 is fixed to the holding frame 11 in the form of a frame 12A, when the plate 12 is removed, the solidified kneaded material 1A is moved from the holding frame 11 to the frame portion 12A. And the plane processing tool B1 does not interfere with the holding frame 11 during the plane processing by the processing machine.
[0046]
Next, in FIG. 4 (E), the lower surface after the plane processing is processed into a predetermined shape with the shape processing tool B2 using the protection plate 13 as a reference surface.
[0047]
After processing into a predetermined shape, in FIG. 4 (F), the protection plate 14 is placed on the processed lower surface and fixed to the holding frame 11, and in FIG. 4 (G), it is inverted and installed on the base of the processing machine. Then, in FIG. 4 (H), the upper protective plate 13 is removed, and in FIG. 4 (J), the upper surface is processed into a predetermined shape by the shape processing tool B2 using the lower protective plate 14 as a reference surface. A first block 10 shown in (K) is obtained (upside down as compared to FIG. 3).
[0048]
The processing steps of the second block 20 will be described with reference to FIG. The processing steps of the second block 20 are almost the same as the processing steps of the first block 10 shown in FIG. 4, and the same portions will be described in brief, and the differences will be described in detail.
[0049]
First, the upper surface of the solidified kneaded material 1A is flattened by the flattening tool B1 of the processing machine (see FIG. 5A), and then the protection plate 23 is set on the flattened upper surface, and the leg of the protection plate 23 23A is fixed to the holding frame 21 (see FIG. 5B), the transporting hook 21A of the holding frame 21 is turned upside down, and the protection plate 23 is placed on the base of the processing machine with the protection plate 23 facing down ( 5 (C), the plate 22 is removed from the holding frame 21, the covered lower surface is exposed, and the lower surface of the solidified kneaded material 1A is planarized by the planar processing tool B1 of the processing machine in the same manner as the upper surface. (See FIG. 5D). In this processing step, only the thickness of the block differs from that of the first block 10.
[0050]
Next, in FIG. 5E, similarly to the first block 10, the lower surface of the solidified kneaded material 1A after the plane processing is processed into a predetermined shape with the protection plate 23 as a reference surface using the shape processing tool B2. In this step, unlike the first block 10, the portion 20A in which the inverse has been eliminated is processed.
[0051]
After processing into a predetermined shape, the protection plate 24 is placed on the processed lower surface, fixed to the holding frame 21 (see FIG. 5 (F)), inverted, and placed on the base of the processing machine (FIG. 5 (G)). 5), the upper protective plate 23 is removed (see FIG. 5 (H)), and the upper surface of the solidified kneaded material 1A is processed into a predetermined shape with the shape processing tool B2 using the lower protective plate 24 as a reference surface (FIG. 5). (J), and a second block (see FIG. 5 (K)) 20 is obtained.
[0052]
The third block 30 is a base of the mold shown in FIG. 3, and as shown in FIG. 6, only the plane processing of the upper surface of the solidified kneaded material 1A is performed by the plane processing tool B1 of the processing machine.
[0053]
The first to third blocks 10, 20, and 30 obtained by the above-described cutting are conveyed to an assembling process, and are completed as a mold through an assembling process C shown in FIG. Note that the shape of each block differs depending on the shape of the mold to be formed, and the third block 30 may also be shaped.
[0054]
In the assembling step C shown in FIG. 7, the first block 10 and the second block 20 are combined to form an assembly 35, and the assembly 35 of the first and second blocks 10 and 20 is combined into a third block 30. It is done by combining.
[0055]
First, since the first block 10 is turned upside down in the mold and combined with the second block 20, the upper surface is sandwiched by the protection plate 13 in which the leg 13A is fixed to the holding frame 11 (see FIG. 7A). After preparation for inversion, the hook 11A of the first block 10 is lifted by a crane and inverted (see FIG. 7 (B)), and the upper and lower protection plates 13 and 14 are removed while being suspended at this inversion position. (See FIG. 7C), the first block 10 in this state is aligned with the second block 20 placed on the protection plate 24 (see FIG. Then, an assembly 35 of the two blocks 10 and 20 is obtained (see FIG. 7E).
[0056]
Although not shown, the assembly 35 may be fixed so that the holding frames 11 and 21 are not displaced by fastening means.
[0057]
Next, the assembly 35 is lifted by a crane using the transport hooks 21A of the holding frame 21, the protective plate 24 on the lower side of the assembly 35 is detached (see FIG. 7F), and the assembly 35 is placed on the third block 30. A completed mold can be obtained by stacking while aligning.
[0058]
In addition, it is not necessary to provide a sealing means for preventing the molten metal from leaking out between the stacked first to third blocks 10, 20, and 30, and the blocks are sealed by their own weight. In this case, casting burrs are generated between the blocks. However, since the blocks 10, 20, and 30 are integrated with the holding frames 11, 21, and 31, deformation and the like hardly occur, and the occurrence of casting burrs is within an allowable range. Can be suppressed.
[0059]
In this embodiment, the solidified kneaded material 1A is formed in the frame blocks 1, 10, 20, 30 that are integrated with the holding frames 3, 11, 21, 31. , 11, 21, and 31 can be securely held, and a large mold can be manufactured.
[0060]
In addition, since the holding frames 1, 11, 21, and 31 can be transported by the transport means using the transport hooks 7, 11A, 21A, and 31A, even if the size is increased, there is no trouble in handling.
[0061]
In addition, by stacking these frame blocks 10, 20, and 30, a much larger mold can be formed.
[0062]
The frame blocks 10, 20, 30 are formed by stacking at least three or more, and at least one surface of the surface of the kneaded material 1A where the intermediate frame block 20 and the frame blocks 10, 30 at both ends are in contact with each other. Since the shape is processed as a mold space on both sides of the intermediate frame block 20, a mold including the inverse 20A can be easily formed, and a mold having a complicated shape can be manufactured.
[0063]
Then, the intermediate frame block 20 is processed by one of the surfaces of the kneaded material 1A by the shape processing means B2, and then inverted by the conveying means, and the other of the surface of the kneaded material 1A is processed by the shape processing means B2. More complex mold shapes can also be produced.
[0064]
Furthermore, since the kneaded material 1A and the holding frames 1, 11, 21, 31 are integrated by the plurality of pins 6, the kneaded material 1A can be firmly supported, and the larger frame block 10 , 20 and 30 to help form large molds.
[0065]
FIG. 8 shows a mold dividing process flow E of the processing apparatus D in the mold manufacturing method of the present invention, and FIG. 9 is a diagram in which the process performed by the mold dividing process flow E of FIG. is there.
[0066]
The mold division processing flow E is based on the three-dimensional structure data of the mold in step 1 and includes a portion having data, that is, a portion having a substance constituted as a mold and a portion having no data, that is, a space around the mold. The three-dimensional data of the mold is created by inverting the part or the space part in the mold.
[0067]
Next, in step 2, the three-dimensional data of the mold is divided into three parts, a first block (upper mold) 10, a second block (middle mold) 20, and a third block (lower mold) 30, using the two divided surfaces 40 and 41. . The following steps will be described in connection with the case where the step 2 divides the plane of FIG. 9A into three and each block becomes the state of FIG. 9B.
[0068]
The division in this step is a pre-stage processing necessary for the mold division processing described later, and is different from the division plane finally determined by the mold division processing described later. Therefore, the positions of the dividing surfaces 40 and 41 in this case may be any appropriate positions. For example, it is desirable to divide the portion of the cavity of the mold having a large horizontal volume by the dividing surfaces 40 and 41.
[0069]
In step 3, it is determined by the division in step 2 whether or not there is a solid body floating in the air in each of the blocks 10, 20, and 30. If there is a solid floating in the air in step 3 (NO), the process proceeds to step 4, where processing for combining the solid floating in the air with an adjacent block is performed.
[0070]
In this process, in FIG. 9C, the solids 42 and 43 floating in the block 1 are changed from the block 10 to the block 20 as indicated by arrows, and the solid 44 floating in the block 20 is Blocks 20 to 10 are combined as shown by arrows.
[0071]
If there are no solids floating in the air in step 3 (YES), and if the solids floating in the air combined with adjacent blocks have been processed in step 4, the process proceeds to step 5, where each block is It is determined whether or not 10, 20, and 30 can be machined from the upper and lower surfaces.
[0072]
This determination is for determining whether there is a space (inverse) hidden when viewed from above and below. As a specific example, as shown in FIGS. When there are two or more processing surfaces that intersect the Z axis (vertical axis) (W in FIG. 10), it is determined that processing cannot be performed from the upper and lower surfaces (NG). If there is no hidden space, it is determined that machining is possible from the upper and lower surfaces (YES), and the mold division processing flow E is completed.
[0073]
In the above judgment, if there is a hidden space, for example, if there are the inverses 45 and 46 corresponding to the hidden space of the block 10 in FIG. The solid in the range that interferes with the processing (the solid 47 and the solid 48 in FIG. 9C, the solids 53, 52, and 53 in FIG. 10 (the solid 53 shown in FIG. 10C is adjacent in step 4). )) Are separated into blocks.
[0074]
In this case, the separation is performed vertically by a surface extending to the outer peripheral edge of the mold, as in solids 47 and 48 in FIG. 9C.
[0075]
Next, in step 7, the separated solids are combined into adjacent blocks. In the case of FIG. 9 (C), this process is a process in which the solids 47 and 48 separated from the block 10 are combined into the block 20 as shown by an arrow. 20 and 30 have the shape of FIG. 9 (D).
[0076]
The blocks 10 and 20 shown in FIG. 9 (D) are slightly different from the blocks 10 and 20 shown in FIG. Is different in shape.
[0077]
When the processing in step 7 is completed, the process proceeds to step 8, and similarly to step 5, it is determined whether or not each block can be further processed from the upper and lower surfaces. , The mold division processing flow E is completed.
[0078]
However, if it is determined in step 8 that each block cannot be processed from the upper and lower surfaces (NO), the process proceeds to step 9. Thus, the determination that the block cannot be processed from the upper and lower surfaces in step 8 corresponds to a case where the shape of the mold cannot be handled by two divided surfaces.
[0079]
Therefore, in step 9, the block that cannot be processed is divided into upper and lower parts at an appropriate position, and the division processing flow from step 3 is executed. If each divided block can be processed from above and below, it is composed of four blocks. A mold is formed. Of course, there may be cases where further division is required.
[0080]
In the mold division processing of the above embodiment, the blocks 10, 20, and 30 of the mold are separated from the corresponding block and combined with the adjacent block by separating the solid forming the unworkable part from the corresponding block. The shape can be adapted to the shape, and the number of divided blocks can be minimized.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a mold manufacturing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic process diagram showing an example of a frame block forming process to which the present invention is applied, for each of the processes (A) to (C).
FIG. 3 is a cross-sectional view showing an example of a mold formed by the method for producing a mold of the present invention.
FIG. 4 is a process chart for explaining the processing steps of the first block in the order of (A) to (K).
FIG. 5 is a process chart for explaining a processing step of the second block in the order of (A) to (K).
FIG. 6 is a process diagram illustrating a processing step of a third block.
FIG. 7 is a process chart for explaining a mold assembling process in the order of (A) to (G).
FIG. 8 is a flowchart showing a mold division processing flow of the present invention.
FIG. 9 is an explanatory diagram visualizing the processing performed by the mold division processing flow of FIG. 8 in the order of (A) to (D).
FIGS. 10A to 10C are explanatory diagrams illustrating examples in which machining is not possible from any of upper and lower surfaces.
[Explanation of symbols]
A Frame block forming step B Block processing step B1 Plane processing tool B2 Shape processing tool C Assembly step D Processing device E Die splitting process 1 Frame block 1A Kneaded materials 2, 12, 22 Plates 3, 11, 21, 31 Holding frame 4 Molded frame 5, 8 Frame 6 Pin 7, 9, 11A, 21A, 31A Transport hook 10 First block 13, 14, 23, 24 Protective plate 20 Second block 30 Third block 35 Assembly 40, 41 Dividing surfaces 42, 43, 44, 47, 48, 51, 52, 53 Solid 45, 46 Inverse

Claims (8)

A holding frame body provided with a plurality of transfer hooks on its outer periphery to be engaged with the transfer means; Form a frame block from the solidified kneaded material that is directly processed by the shape processing means,
A mold characterized by stacking these frame blocks. The frame block is laminated at least three or more,
The mold according to claim 1, wherein at least one of the surfaces of the solidified kneaded material that comes into contact between the respective frame blocks is shaped as a mold space. The frame block located in the middle of the plurality of frame blocks is processed by the shape processing means on one of the surfaces of the solidified kneaded material, and then inverted, and the other of the surfaces of the solidified kneaded material is processed by the shape processing means. The mold according to claim 2, wherein: The mold according to any one of claims 1 to 3, wherein the holding frame body supports the solidified kneaded material by embedding a plurality of pins protruding inward into the solidified kneaded material. . Filling and solidifying the kneaded material of the granular material and the solidifying agent in the frame body configured to be able to be conveyed by the conveying means, and forming a frame block integrated with the frame body,
Directly processing at least one of the solidified kneaded material surface of the frame block by shape processing means,
Next, a mold is formed by combining the processed frame block with another frame block to form a mold. The frame block is laminated at least three or more,
The method for manufacturing a mold according to claim 5, wherein at least one surface of the solidified kneaded material that comes into contact between the respective frame blocks is shaped as a mold space. The frame block located in the middle of the plurality of frame blocks is formed by processing one of the surfaces of the solidified kneaded material by the shape processing means and then inverted by the conveying means, and the other of the surface of the solidified kneaded material is processed by the shape processing means. The method for producing a mold according to claim 6, wherein the mold is processed. Invert the three-dimensional structure data of the mold between the part with data and the part without data to form three-dimensional data of the mold,
Next, the template solid data is divided by an arbitrary plane to form a plurality of blocks,
In each block, determine the parts that cannot be machined from the top and bottom machining directions,
The solids that make up the part are separated from the block and merged with the adjacent block,
A method for producing a mold, comprising stacking the obtained blocks.

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