JPH0751792A - Pattern for manufacturing casting mold and manufac ture of casting mold using the pattern - Google Patents

Abstract

PURPOSE:To improve the workability at the time of manufacturing by fixing each blade pattern part to each arc peripheral part and fitting a thin sheet for partition to each blade pattern part. CONSTITUTION:In a wooden pattern 5, the shaft part 1 is divided into the inner and the outer parts 1a, 1b and the blade patterns 19 as a part for element arranged around the shaft part 1 are integrally assembled in the wooden pattern 1b at the outside part. The blade patterns 19 are arranged at e.g. four pieces, and the wooden pattern part 1b at the outside is divided into four pieces according to the number of the blade patterns 19. The blade divided pattern is made to be block with the blade pattern 19 and the wooden pattern part 1b at the outside, and the wooden pattern 5 is positioned on a surface plate 11. The thin sheets 12 (e.g. tin plate) for partitioning are extended from the blade divided patterns 19 together with the blade divided pattern 19, between an outer frame for sand mold. This thin sheet 12 for partition are arranged along two places of the top part and the lower end side part of the blade divided wooden pattern 19. By this method, the thickness and the shape, etc., of the product can easily be confirmed with visual inspection at the time of manufacturing the mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die used for producing an airfoil casting having a central shaft portion, and a method for producing a die using this die.

[0002]

2. Description of the Related Art In the production of castings, materials such as wood, resin, and metal are processed alone or in combination to produce a cast model or prototype, which forms a mold. In this specification, this model or prototype is referred to as a “mold”.

In order to manufacture a mold required for casting an impeller, a shift type system has been conventionally favored and used for manufacturing a mold.

[0004] However, for example, in the case of casting a four-blade impeller, if a shift type method is adopted, in order to complete a mold corresponding to one impeller, a 1/4 sand mold for casting is oystered. It was necessary to carry out the work of scraping with a plate in four steps.

Also, in the case of each of the sand molds for casting, due to the three-dimensional shape, some of them may be assembled together unless the sand mold is divided into two parts using cardboard or the like. Since it is not possible to do so, the work process for constructing the mold is complicated and the productivity of the mold is low.

Further, when the mold is constructed by a sand mold taken by scraping with an oyster board, it is not possible to directly confirm the wall thickness of the impeller wing portion directly with the naked eye, and each sand mold is of course impossible. It was not easy to adjust the dimensions of each part of the mold, because it was recognized only as a gap existing in the gap of the sand mold even at the time of combining.

In addition, in the shifting core type, since it is usually impossible to manufacture a curved surface (also called R surface) formed at the base of the blade with a mold, after casting sand is self-hardened into a block, Carry out the work of cutting the corner to the specified R surface. this is,
I had to rely on the experience and intuition of the operator, and I had to be prepared for considerable difficulty in creating a mold with the shape specified in the drawing.

As a method for solving the above problems, in order to construct an airfoil element such as an impeller, it was conceived to manufacture it with a current mold in order to improve the reproducibility of the mold.

However, when the shape is complicated because it is three-dimensionally twisted and the width dimension of the airfoil element becomes large, the current die is pulled out from the foundry sand die produced using the foundry sand. It was very difficult to do so, and in some cases it was impossible to pull out the current die from the sand mold for casting that was made impossible due to the collision relationship with other parts.

Therefore, for example, when a wing-shaped casting mold is manufactured by a wooden mold, that is, a wooden mold, a partial wooden mold of the wing-shaped element is manufactured by the current mold, and at this time, it is convenient to make a sand mold. As good as possible, for example, while making a sand mold while placing a partition plate made of tin in the middle part of the wing type partial wood type, pull out the main mold from the sand mold and place it in the dent type machine. I tried the method of arranging each sand mold of the element, or the method of assembling the partial molds of the wing type element on the surface plate.

However, even in these cases,
The assembly was not stable, "hagumi" appeared in the middle of the airfoil part, variation in the wall thickness of the blade gap was recognized, and even balance and dimensional accuracy after casting It did not come out and work efficiency was never good.

[0012]

SUMMARY OF THE INVENTION The present invention can solve the above problems and produce a casting that is faithful to the shape and dimensions specified in the drawings, in other words, has high reproducibility from the mold to the product. It is an object of the present invention to disclose a mold and a method of manufacturing a mold using the mold, which is easy and can improve the workability in manufacturing the mold.

[0013]

A mold for producing a mold according to the present invention is a mold comprising a shaft portion and a plurality of airfoil portions extending from the shaft portion, wherein the shaft portion is the central shaft portion and a peripheral edge around the central shaft portion. Divided into parts, the peripheral part is divided into arcs corresponding to the number of the plurality of airfoil parts, each airfoil part is fixed to each arcuate peripheral part, and a partition thin plate is attached to each airfoil part. The structure comprising the arcuate peripheral portion, the airfoil portion, and the partitioning thin plate serves as a partition for dividing the mold when the mold is molded by the mold.

The central shaft portion may have a cylindrical shape, a truncated cone shape, or a polygonal prism shape, and the airfoil portion may have a pump impeller shape.

Further, in the mold for producing a mold of the present invention, the outer edge of the airfoil portion is spiral with respect to the shaft portion, and a partitioning thin plate is provided at at least one end in the axial direction of the spiral outer edge, The outer edge of the partitioning thin plate may be continuous with the outer edge of the airfoil portion.

Further, the mold for producing a mold of the present invention is a mold used for producing a mold for casting a casting having an element extending from the rotary bearing portion, and the rotary bearing portion is constructed. The partial mold is a split mold that is divided into two inside and outside with a concentric circle or a shape similar to this, and the outside partial mold is divided into multiple parts and the partial mold for the element is integrally incorporated. The inner part mold of the part is integrated with the surface plate when manufacturing the mold, and the flat plate or curved partitioning thin plate is fixed to at least part of the element part mold fixed to the outer part mold. It is also characterized in that the inner part mold, the element part mold, and the partition thin plate separate the mold into a plurality of blocks.

In the above case, the element may be in the form of a pump impeller, and the outer edge of the elemental part die is spiral with respect to the part of the rotary bearing part, and the spiral outer edge is A partitioning thin plate may be provided at at least one end in the axial direction, and the outer edge of the partitioning thin plate may be continuous with the outer edge of the elemental part die.

Next, according to the method for producing a mold of the present invention, the positioning rod member is set upright on the upper surface of the surface plate in the space formed by the sand-filled outer frame and the surface plate, and the positioning rod member is placed upright. In the form of wrapping around the positioning rod member, a split partial mold in which the element part is incorporated in the shaft piece part that fits the outer surface of the positioning rod member is arranged, and a partition plate in a flat or curved state is prepared, and the outer edge of the element part is separated. A partition plate is fixed to the element part so that either the outer edge of the plate will always contact the inner surface of the outer frame, and then self-hardening molding sand is supplied into the space, and the sand is solidified to build a sand mold. Then, the shaft piece portion, the element portion and the partition plate are partitions that penetrate and divide the inside of the mold frame, the sand mold that has been constructed is separated into multiple blocks, the outer frame is removed and the sand mold block is taken out from the inside. , After separating from the divided part mold, modify the sand mold block. Te assembling, fitting into the type outer which are separately formed in accordance with the outer shape of the sand mold, characterized in that assembling the whole in a state where we arranged appropriately core.

In the method for producing a mold, the elemental portion may be in the form of a pump impeller.

Further, the sanding outer frame may be formed so that its inner surface contacts the outer edge of the elemental part. In this case, the outer edge of the elemental part cannot contact the inner surface of the sanding outer frame. The partition plate may be attached to the element part so that the outer edge of the partition plate is in contact with the inner surface of the sand-filling outer frame.

Further, the airfoil partial mold of the present invention is divided into a number of airfoils around the positioning member in the sand blasting outer frame to make a mold for casting the airfoil member. An airfoil partial mold, wherein the mold is divided into blocks with the airfoil partial mold as a boundary, and the space surrounded by the sanding outer frame is arranged so that the block can be separated. It is characterized in that a partition plate for partitioning with the airfoil partial mold between the outer frame for sand and sand is extended from the airfoil partial mold.

[0022]

In the present invention, as a shaft portion, for example, a mold for constructing a rotary bearing portion of a pump impeller is drawn with a point intersecting the central axis in a plane orthogonal to a plane including the central axis. Is divided into two parts inward and outward in the radial direction of the circle with a concentric circle or a shape similar thereto, and, for example, depending on the number of blades of the pump impeller, a plurality of outer peripheral portions, for example, four or five. It is a split type current type divided into two. A blade type element fixed to the rotary bearing shaft, for example, a current type partial type of a pump impeller is attached to the partial type of the outer peripheral portion. Thereby, the shape of the casting can be visually predicted in advance, and the shape of the casting can be easily adjusted in detail. A sand mold is formed by inserting sand into the space formed between this mold and the sand-filling outer frame.

In this case, the created sand mold is divided by the partition formed by the peripheral portion of the shaft portion (rotary bearing portion partial mold), the blade type partial mold, and the partition thin plate. The central shaft part mold and the peripheral part mold of the shaft part are easily separated.

The mold is made of wood, resin, metal, other materials, or a combination thereof.

In order to form the partition, specifically, the outer edge of the partial die of the airfoil element is continuously in contact with the inner surface of the outer frame. Further, where this contact is not made, a flat or curved partition plate is fixed to the outer edge of the partial mold of the airfoil element so that the outer edge of this partition plate can continuously contact the inner surface of the outer frame. By preparing it, it is possible to easily divide the sand mold that has been embedded. This partition plate further extends the airfoil partial mold extending from the rotary bearing portion, and the outer partial mold of the shaft portion, the airfoil partial mold, and the partition plate constitute a partition extending in the radial direction and the circumferential direction.

When the outer frame is removed, the self-hardening sand type blocks of the same number as the number of blades are divided and produced, and this division is a substantially fan-shaped cross section, so that the sand type blocks can be easily separated and pulled out from each other. Is.

Further, the rotary bearing and the element are formed by integrally incorporating the elemental part die extending from the shaft part into the outer part die out of the split die current mold which is divided into the inner part and the outer part by the shaft part. The shape of the casting at the contact point with can be formed in a stable state. For this reason, it is not necessary to finish the sand mold block or the like by a skilled person, which has been conventionally required.

Further, by integrating the partial mold located inside from the central axis of the shaft portion with the surface plate, the position where the shaft portion is located on the surface plate in the mold is made constant, that is, positioned. obtain.

The inventors of the present invention call the mold making method of the present invention a KF method.

[0030]

Embodiments of the present invention will be described in more detail below with reference to the drawings. In this embodiment, a wooden mold, that is, a wooden mold will be described.

The present inventor actually carried out the present invention as follows when manufacturing an impeller for a four-blade pump part stainless steel.

That is, as an embodiment of the present invention, as shown in FIG. 1, it is used in manufacturing a mold 4 (FIG. 6) for an impeller, which is an element arranged around a rotary bearing portion. I made a wooden pattern 5. The mold 4 is, as described later,
8 is a partial mold forming a part of a mold (FIG. 7) for casting the impeller member.

In the wooden mold 5, the shaft portion 1 constructing the rotary bearing portion of the impeller is centered on a point intersecting the central axis in a plane orthogonal to the plane including the central axis of the shaft portion 1. Divide into two inside and outside in the radial direction of the drawn circle with a concentric circle or a shape similar to this (1a, 1b)
Has been done. Further, among the split partial wooden molds divided into two inside and outside by the shaft portion 1, a partial partial wooden mold 19 arranged around the shaft portion 1 is integrally incorporated in the outer partial wooden mold 1b. There is. In this embodiment, the partial wood pattern 19 is four wing shapes,
In response to this, the partial wooden pattern 1b is divided into four in the circumferential direction and the cross section has an arc shape, and the joint 1c is visible.

FIG. 2 shows the peripheral part wooden mold 1b separated from the central shaft partial wooden mold 1a.

The central shaft portion wooden mold 1a, which is inside when viewed from the central shaft of the shaft portion 1, is integrated with the surface plate 11 when the mold 4 is manufactured. As a result, the central shaft partial wooden pattern 1a can be used as a positioning means.

Further, in the illustrated case, the outer diameter of the shaft portion 1 becomes larger as it is closer to the surface plate 11 except for the upper end portion, that is, it is arranged in a conical shape. This is a space 10 (FIG. 7) in which the core 35 is placed in the mold as described later. In addition, in the illustrated case, the central shaft portion wooden mold 1a has a conical shape, but may have a cylindrical shape. Further, in some cases, a polygonal prism shape may be adopted. Although the upper end portion has a cylindrical shape in the illustrated case, this portion is provided to fix and integrate a partitioning thin plate 12 described later, and is not a casting mold. .

A flat or curved partitioning thin plate (for example, tin plate) 12 is fixed to a part of the blade-shaped partial wooden mold 19 fixed to the peripheral partial wooden mold 1b of the shaft portion 1. As shown in FIG. 13, the partitioning thin plate 12 is provided so as to extend the outer edge of the wing-shaped partial wooden pattern 19. In the illustrated case, the partitioning thin plate 12 is provided along two points on the top and the lower end side of the wing type partial wooden pattern 19. In the case of the structure shown, it is necessary to provide a partition plate at this location for dividing the sand block. The thickness of the partition thin plate 12 is actually
The shape is kept as thin as possible during handling.
This is for fitting the joint 12a exactly as described with reference to FIG.

Further, since the wing type partial wood pattern 19 is the current model, it goes without saying that the thickness of the casting is exactly the thickness of the casting.

Since the figures are schematic, the dimensional relationships between the parts are not always accurate.

When the mold 4 is manufactured, the sand-filling outer frame 14 in contact with the outer periphery of the surface plate 11 and the sand-filling outer frame 14 that can be stacked in several stages are prepared. The outer frame 14 of each step is formed in two cracks (a crack 14g is shown in FIG. 17) and is integrally fixed with a stopper. In the space 15 formed by the stacked outer frame 14 for sand and the surface plate 11,
Inner (central axis) partial wooden pattern 1a protruding on the upper surface of the surface plate 11
The wooden block 5 for the pump impeller, which has been positioned by, is arranged.

The peripheral edge wooden mold 1b of the shaft portion 1, the wing type partial wooden mold 19 and the partitioning thin plate 12 are formed when the sanding outer frame 14 in which the wooden mold 5 is arranged is filled with foundry sand. Note the partition that divides the mold into multiple blocks. For this reason, the partition thin plate 12 is, as described above,
It is attached also to places other than those shown in the drawing, and the outer edges of these partitioning thin plates 12 abut the outer frame 14, surface plate 11, and the like. Further, the outer edge of the wing type partial wooden pattern 19 also abuts the outer frame 14. If you do not do this, it will not be a partition that completely blocks the sand mold.

In order to facilitate the above-mentioned abutting, the inner surface of the stackable outer frame 14 has its inner diameter changed depending on the height. In the case of this embodiment, the outer frame 14 is composed of three stages,
The inner surface of the lower outer frame 14a is in contact with the radial outer edge 12b (FIG. 10) of the lower partition thin plate, and the inner surface of the middle outer frame 14b is the upper edge 12c of the partition thin plate 12 and the blade-shaped partial wood pattern 19
And the inner surface of the upper outer frame 14c is in contact with the outer edge of the upper partition thin plate (see FIGS. 3 and 10). Further, the shaft portion 1, the blade-shaped partial wood pattern 19, and the lower partition plate 12 are also in contact with the surface plate 11.

In the sand filling, first, when the outermost frame 14a is installed, self-hardening molding sand is supplied, and the sand is hardened, and the outer frames 14b and 14c are sequentially stacked, and the sand mold is placed inside the sanding outer frame 14. Build 4.

In the illustrated case, the sand mold 4 is composed of four blocks. This is as shown in FIG. 3, which is a cross-sectional view of a plane parallel to the surface plate 11, and includes the partition thin plate 12 and the outer frame 1.
4, the positional relationship among the casting sand 15, the blade-shaped partial wooden mold 19, the central axis (positioning) partial wooden mold 1a, and the arc-shaped peripheral partial wooden mold 1b is illustrated. For clarity, in FIG.
Illustration of many members is omitted, and the molding sand 15a is shown in only two of the four blocks. Foundry sand 15a
The block of is buried under the wing-shaped partial wooden pattern 19 of the adjacent block. The wing type wooden pattern 19 extends in a curved shape from the illustrated cross section.

When the casting sand is completely filled, the work of removing the outer frame 14 and the wooden mold 5 is started. First of all, removal work
With the sand block 17, the surface plate 11 and the outer frame 14 integrated, turn upside down, remove the surface plate 11, and then
The two split outer frames 14a, 14b, 14c are sequentially removed to both sides. Each sand mold block 17 is laterally moved outward in the radial direction, and a plurality of sand mold blocks 17 are obtained as the work progresses (see FIG. 4).

Since the sand block 17 is divided into substantially fan-shaped cross sections, it can be easily pulled out to the outside in the horizontal direction. In the structure of the present embodiment, the partitioning thin plate 12 fixedly integrated with the upper end of the shaft portion 1 is fixed from the surface plate 11 along the furthest or higher part of the wing type partial wood pattern 19. It is important to be able to withdraw.

When the sand mold block 17 is pulled out, the arc-shaped peripheral portion wooden mold 1b of the shaft portion (rotational bearing portion), the blade-shaped partial wooden mold 19, and the partitioning thin plate 12 are removed from the sand mold block 17.
It is brought out by sticking together. However, it is easy to remove even if it does not stick to the sand block.

After that, the sand block 17 in the divided state is reassembled. FIG. 5 shows a state where the three sand mold blocks 17 are assembled (remaining blocks are shown by imaginary lines), and FIG. 6 shows a state where the impeller partial mold 4 is completed. Gap 19 corresponding to partial wood pattern 19 for wing shape
a and the seam 12a of each block are visible. Although not visible in the figure, a gap 19a in the airfoil portion is opened on the surface of the block inside the assembly table 20. The shape of the gap 19a corresponds exactly to the impeller. Also, the partition thin plate 12
At the seam 12a of the part where there was the sand type block, the sand type blocks were fitted exactly.

The partial mold 4 shown in FIGS. 5 and 6 is used.
Has an inverse relationship with the tree pattern 5 in FIG.
In this posture, the partial mold 4 is unstable at the time of assembly, so that the partial mold 4 is mounted on the assembly table 20 and assembled. Of course, block 1
If the side surface of 7 is straight, it is stable even in this posture, and the gap 19a can be prevented from opening to the outside.
In this case, a partitioning thin plate is further required along the outer edge 19b of the wing type partial wood pattern 19 until reaching the side surface of the block 17, and the amount and weight of sand are excessively increased.

FIG. 7 shows a mold incorporating the partial mold 4 made by the wooden mold 5 of the present invention. This mold is composed of a partial mold 4, and an upper mold 30 and a lower mold 32 having an inner surface shape matching the outer shape thereof. That is, the core 35 is installed in the upper mold 30 arranged in the mold 40, the recess (space) 10 is aligned with the core 35, the partial mold 4 is placed, and the lower mold 32 is further installed. In this way, the partial sand mold 4
In a state where a core 35 as a part to be replaced with a separately manufactured rotary shaft is arranged in the recess 10 of the, the partial mold 4 is fastened together with the lower mold 32 and the upper mold 30 by a mold frame 40 to assemble the wing-shaped element. The pouring work into the space 19a corresponding to the above and the space corresponding to the rotary bearing portion was started. In FIG. 7, another core 34 is buried in the void corresponding to the shaft portion 1 of the wooden pattern 5.

In this case, not only is it possible to efficiently perform the sand-molding work with only one work, but also the wing-shaped partial wooden mold 1
Because the shape of the blades can be visually adjusted prior to the casting work due to the fact that the whole is manufactured in the current mold including 9, the thickness of each part of the blade-shaped partial wooden mold 19, the clearance of the skirting board, and variations in these It has become possible to reduce significantly.

Further, the partitioning thin plate 12 is used as the blade type partial wood pattern 1
Since it is possible to mold along the curved surface drawn by 9, the mold 4 can be manufactured in an extremely precise shape.

As a result, it was finally possible to manufacture a cast product having high dimensional accuracy and excellent aesthetics.

The partial mold 4 may be turned upside down from that shown in FIG. 7 to manufacture the mold.

8 to 15 show a four-divided partial tree pattern of the tree model 5 made in the same manner as in FIG. However, in FIG. 1, the partial tree shape of the central axis or the positioning portion is made into a conical shape, but in the case of this embodiment, since it is made into a cylindrical shape, the arc-shaped peripheral portion 16
The inner surface of is a cylindrical surface. The same parts are designated by the same reference numerals and the description thereof will be omitted. Also, FIGS.
In the surface mated to the outer frame, partial wooden and partitioning thin plate are denoted by underline reference numbers of each wooden mold corresponding part (1 2, 1 b, 1 9, 1 4a, 1 4b) .

FIG. 10 shows a contact relationship with the sand-filling outer frame 14. That is, the inner surfaces of the outer frames 14a and 14b are
The outer edge 12b of the partition thin plate 12 and the wing type partial wood pattern 19
It is in contact with 2c and 19b. This is the space 1 inside the outer frame 14.
This is because 5 is completely partitioned.

In FIG. 13, the partition plate 12 and the outer edges 12b, 12c, 19b and 12d of the wing type partial wood pattern 19 are shown, and these are in contact with the inner surface of the outer frame 14 (see FIG. 10). Incidentally, in response to this, the inner surface of the outer frame 14 is formed in an uneven shape or an inclined shape. In the illustrated case, the block portion 17a
The block portion 17b (most of which is hidden by the wing type partial wooden pattern 19) has a smaller diameter, and when the block 17 is assembled excluding the wooden pattern, the outer edge 1 of the wing partial wooden pattern 19
9b will be exposed.

FIG. 16 shows a state corresponding to the single block shown by the phantom line in FIG. 5, as viewed from the direction of the arrow in FIG. In Figure 16, the left side surface 1 2, 1 9, the surface of the left part wooden 12 and 19 are mated the back surface of the right portion wooden 12 and 19 on the right side surface 1 2, 1 9.

FIG. 17 shows the wooden mold 5 according to the embodiment of the present invention installed in the sand-filling outer frame 14. In the present invention, the root surface (R surface) 16 of the blade is accurately transferred to the mold for the current mold.

[0060]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the present invention provides a mold used when casting a casting that is produced around the central axis of the rotary bearing portion. Since the mold is the current model, the thickness and shape of the product can be easily confirmed with the naked eye when the mold is manufactured.

Therefore, the thickness of each part of the airfoil portion of the impeller,
It has made it possible to significantly reduce the pitch between each impeller blade, the clearance of the skirting board, and these variations.

Further, since the airfoil portion of the impeller, specifically, the front and back flow surfaces are not divided, there is no step difference at the inlet end of the blade suction portion, and the curved surface drawn by the airfoil portion of the impeller is not generated. Since it is possible to mold the mold in accordance with
We were able to manufacture a mold with an extremely precise shape.

As a result, it was finally possible to manufacture a cast product having high dimensional accuracy and excellent aesthetics.

As described above, according to the present invention, it is possible to manufacture the product to be manufactured faithfully according to the manufacturing drawings and efficiently, and to supply the casting product having high reproducibility from the mold to the product. It is also possible to do.

[Brief description of drawings]

FIG. 1 is an assembled state of a wooden mold according to an embodiment of the present invention.

FIG. 2 is a perspective view of the tree-shaped airfoil portion of FIG. 1 in a disassembled state.

FIG. 3 is a transverse cross-sectional view showing a state where the wooden mold of the embodiment of the present invention is installed in the sand-filling outer frame, and the molding sand is packed in two of the four partitioned spaces.

FIG. 4 is a perspective view showing a state in which the sand mold block solidified in the sand-filling outer frame of FIG. 3 is removed from the wooden mold and placed in pieces.

5 shows a state in which the sand block of FIG. 4 is assembled.

6 is a perspective view showing a partial mold for an airfoil in which the assembly of FIG. 5 is completed on an assembly table.

7 is a cross-sectional view showing the overall structure of a mold having the partial mold of FIG. 6 installed therein.

FIG. 8 is a plan view showing a 1/4 division partial tree pattern of the tree pattern formed in the same manner as in FIG.

9 is a bottom view of the partial tree pattern of FIG. 8. FIG.

10 is a perspective view of the partial wooden pattern of FIG. 8 viewed from the X direction,
Also shown is a partial cross-sectional view of the sandblasting outer frame.

11 is a side view of the partial tree pattern of FIG. 8 viewed from the XI direction.

FIG. 12 is a side view of the partial tree pattern of FIG. 8 viewed from the XII direction.

FIG. 13 is a perspective view of the partial wooden pattern of FIG. 8 as seen from the XIII direction, showing the partial wooden pattern being combined with a sand type block (imaginary line).

FIG. 14 is a perspective view of the partial wooden pattern of FIG. 8 as seen from the XIV direction, showing the combination with a sand type block (imaginary line).

FIG. 15 is a sand-shaped block (virtual line) of the partial wooden pattern of FIG.
It is a side view which shows the place which matched.

FIG. 16 is a perspective view of a sand block.

FIG. 17 is a plan view showing a state where the wooden mold according to the embodiment of the present invention is installed in the sand blasting outer frame.

[Explanation of symbols]

1 rotary bearing part (shaft part) 4 partial mold 5 wooden model 1a split type current shaft part inner part wooden pattern (center axis or positioning part) 1b split type current shaft part outer wooden part ( Arc-shaped peripheral part) 1c Joint 10 Recess 11 Surface plate 12 Partition thin plate 12a Seam 13 Blade inlet tip 14, 14a, 14b, 14c Sanding outer frame 14g Sanding outer frame 2 Dividing line 15 Space 15a Cast sand 16a Wing Outlet tip 16b Airfoil root root curved surface (R surface) 17 Sand block 19 Airfoil part (element part) 19a Gap in the mold for the airfoil part (wing space after removing the wood pattern) 20 Assembly stand 30 Upper mold Sand mold 32 Lower mold 34 Separate core 40 Casting frame

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[Procedure amendment]

[Submission date] December 8, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0059

[Correction method] Change

[Correction content]

FIG. 17 shows the wooden mold 5 according to the embodiment of the present invention installed in the sand-filling outer frame 14. In the present invention, the root surface (R surface) 16 of the blade is accurately transferred to the mold for the current mold. In the above-mentioned embodiment, the upper partition thin plates 12 are all provided on the top of the wing type partial wood pattern 19, but one of the partition thin plates 12 may be placed on the wing surface at a position shifted downward from the top. Is arranged, the extraction work can be facilitated, and the seam of the shaft portion 1, in other words, the cutting line 1c is close to and along the boundary between the conical surface of the shaft portion 1 and the airfoil portion 19. If it is provided, the extraction work can be facilitated.

Claims (12)

[Claims] 1. A mold comprising a shaft portion and a plurality of airfoil portions extending from the shaft portion, wherein the shaft portion is divided into a central shaft portion and a peripheral portion around the central shaft portion, and the peripheral portion is the plurality of airfoil shapes. It is divided into arcs according to the number of parts, each wing shape part is fixed to each arcuate peripheral part, and a partition thin plate is attached to each wing shape part, from the arcuate peripheral part, wing shape part and partition thin plate When the molded body is molded by the mold,
A mold for producing a mold, characterized in that it serves as a partition for dividing the mold. 2. The mold for producing a mold according to claim 1, wherein the central axis portion serves as a positioning means. 3. The mold for producing a mold according to claim 1, wherein the airfoil portion is in the form of a pump impeller. 4. The outer edge of the airfoil portion is spiral with respect to the shaft portion, and a partition thin plate is provided at at least one end in the axial direction of the spiral outer edge, and the outer edge of the partition thin plate is the blade edge portion. The mold according to claim 1, which is continuous with the outer edge. 5. A mold used for producing a casting mold for casting a casting having an element extending from a rotary bearing portion, wherein a partial mold for constructing the rotary bearing portion is a concentric circle or a shape similar thereto. It is a split mold that is divided into two inside and outside, the outside partial mold is divided into multiple parts and the partial mold for the element is integrated together, and the partial mold inside the rotary bearing part makes the mold. In the case of the above, the flat plate or curved partition thin plate is fixed to at least a part of the elemental part mold fixed to the outer part mold, and the inner part mold and the elemental part are fixed. Partial type and partition thin plate
A mold for producing a mold, wherein the mold is divided into a plurality of blocks. 6. The mold according to claim 5, wherein the element is in the form of a pump impeller. 7. An outer edge of a partial mold for a machine element is spiral with respect to a partial mold of a rotary bearing portion, and a partition thin plate is provided at at least one end in the axial direction of the spiral outer edge. The mold for producing a mold according to claim 5, wherein the outer edge is continuous with the outer edge of the elemental part mold. 8. A positioning rod member is erected on the upper surface of the surface plate in a space formed by the sanding outer frame and the surface plate, and the positioning rod member is wrapped in such a manner that the positioning rod member is wrapped around the positioning rod member. Dispose a split part mold that incorporates the element part in the shaft piece part that fits to the outer surface, prepare a partition plate in a flat or curved state, and make sure that either the outer edge of the element part or the outer edge of the partition plate is outside. The partition plate is fixed to the element part so as to contact the inner surface of the frame, and then self-hardening molding sand is supplied into the space, and the sand is hardened to construct a sand mold, and the shaft piece part and the element part. And the partition plate is a partition that cuts through the inside of the mold frame, the sand mold that has been constructed is separated into a plurality of blocks, remove the outer frame and take out the sand mold block from the inside, after separating from the divided partial mold, Reassemble the sand mold block and fit it to the outer shape of the sand mold. A mold manufacturing method, characterized in that the mold is fitted into a separately formed outer mold, and the whole is assembled with the core appropriately arranged. 9. The method of manufacturing a mold according to claim 8, wherein the elemental portion is in the form of a pump impeller. 10. The method for producing a mold according to claim 8, wherein the sanding outer frame is formed so that the inner surface thereof is in contact with the outer edge of the element part. 11. The partition plate is attached to the element part so that the outer edge of the element part cannot contact the inner surface of the sand-filling outer frame, and the outer edge of the partition plate contacts the inner surface of the sand-filling outer frame. The method for producing a mold according to claim 10, wherein. 12. An airfoil partial mold arranged in a sanding outer frame around the positioning member in a divided number of airfoils to form a mold for casting the airfoil member. , Dividing the mold into blocks with the blade-shaped partial mold as a boundary, and separating the blocks so that the space surrounded by the sand-filling outer frame is between the positioning member and the sand-filling outer frame. A wing type partial mold with a partition plate in which a partition plate for partitioning with the wing type partial mold is extended from the wing type partial mold.