JPWO2013030957A1 - Multi-stage press apparatus and method of manufacturing intermediate mold included therein - Google Patents

Abstract

Provided are a small-sized multi-stage press apparatus having a reduced height and a method of manufacturing an intermediate mold included in the apparatus. It is a manufacturing step S1 of the intermediate mold 30 that is formed of a single member and has molding surfaces formed on the upper surface and the lower surface, respectively. The reinforcing member 50 that supports the portion on which the corresponding surface is formed is used to reinforce the disappearance model 40 and the disappearance model 40 in a direction corresponding to the two molding surfaces of the intermediate mold 30 along the vertical direction. As shown, the housing step S12 for housing the inside of the casting frame 60, the first sand filling step S13 for putting the foundry sand 70 into the casting frame 60, and the casting frame 60 are turned upside down to reinforce from the disappearance model 40. After removing the member 50, a second sand filling step S <b> 14 in which the foundry sand 70 is put into the casting frame 60 and a pouring step S <b> 15 for replacing the disappearance model 40 and the molten metal are provided. The multistage press apparatus 1 includes at least one intermediate die 30.

Description

  The present invention relates to a multi-stage press apparatus that simultaneously presses a plurality of workpieces, and a method for manufacturing an intermediate mold included in the multi-stage press apparatus.

  2. Description of the Related Art Conventionally, a multi-stage press apparatus in which a plurality of molds including an upper mold and a lower mold are provided in the vertical direction and simultaneously presses a plurality of workpieces is widely known (see, for example, Patent Document 1).

In the above multi-stage press apparatus, the upper die and the lower die arranged between the upper die located at the upper end and the lower die located at the lower end are respectively fixed to the upper and lower surfaces of the plate-like die plate. .
Hereinafter, a member constituted by a die plate and an upper die and a lower die fixed to the die plate is referred to as an “intermediate die”.
For example, a multi-stage press apparatus provided with two pairs of molds is provided with one intermediate mold, and a multi-stage press apparatus provided with three pairs of molds is provided with two intermediate dies. It becomes.

Thus, in the multistage press apparatus, the upper mold and the lower mold and at least one intermediate mold are arranged along the vertical direction. For this reason, the height (length in the vertical direction) of the multistage press apparatus is increased due to the structure, resulting in an increase in equipment costs.
In particular, as described above, the intermediate mold is configured by fixing the upper mold and the lower mold to the upper and lower surfaces of the die plate, respectively, and the configuration of such an intermediate mold greatly affects the increase in size of the multistage press apparatus. doing. In addition, since there are cases where two or more intermediate dies are provided in the multistage press apparatus, this also greatly affects the enlargement of the multistage press apparatus.

JP 2000-015496 A

  It is an object of the present invention to provide a small multi-stage press apparatus with a suppressed height and a method for manufacturing an intermediate mold included therein.

  The multi-stage press apparatus of the present invention is a multi-stage press apparatus that simultaneously presses a plurality of workpieces, an upper mold having a molding surface formed on the lower surface, a lower mold having a molding surface formed on the upper surface, At least one intermediate mold disposed between the upper mold and the lower mold, wherein the intermediate mold is formed with molding surfaces on the upper surface and the lower surface, respectively, and the two molding surfaces of the intermediate mold are The part to be formed is constituted by one member.

  The intermediate mold manufacturing method of the present invention is an intermediate mold manufacturing method included in the multistage press apparatus, and corresponds to two molding surfaces of the intermediate mold in a model formed in the same shape as the intermediate mold. Reinforcing step for reinforcing the model by a reinforcing member that supports the portion on which the surface is formed, and a model reinforced in the reinforcing step, the surface corresponding to the two molding surfaces of the intermediate mold in the model A casting process functioning as a mold is placed in a housing process in which the model is stored in the housing process and a housing process in which the model is housed in the housing process so as to be positioned along the vertical direction. A first sand filling step, and the casting frame into which the foundry sand is put in the first sand filling step is turned upside down, and the reinforcing member is removed from the model, and then the casting is placed inside the inverted casting frame. A second sand-filling step of throwing sand; The foundry sand in the sand-filling process is anda pouring step of supplying molten metal against model frame cast that are submitted.

  In the intermediate mold manufacturing method of the present invention, the reinforcing member includes a surface corresponding to one molding surface of the intermediate mold and a mounting surface in the model housed in the casting frame in the housing step. It is preferable to be configured to fill a gap formed between the two.

  In the intermediate mold manufacturing method of the present invention, the reinforcing member includes a surface corresponding to one molding surface of the intermediate mold and a mounting surface in the model housed in the casting frame in the housing step. It is preferable to have a plurality of flat surfaces that are arranged in a gap formed between and abut on a flat portion of the surface that forms the gap in the model.

  According to the present invention, it is possible to reduce the size of the multistage press apparatus.

The figure which shows the multistage press apparatus which concerns on this invention. The flowchart which shows the manufacturing method of the intermediate type | mold contained in the multistage press apparatus which concerns on this invention. The figure which shows a reinforcement process. The figure which shows a storage process. The figure which shows a 1st sand filling process. The figure which shows a 2nd sand filling process. The figure which shows another form of a reinforcement member.

Below, with reference to FIG. 1, the multistage press apparatus 1 which is one Embodiment of the multistage press apparatus which concerns on this invention is demonstrated.
The multistage press apparatus 1 is a press machine in which a plurality of processing parts (two in the present embodiment) for processing a workpiece such as a steel plate are provided in the vertical direction. Press work at the same time.
For convenience of explanation, the vertical direction in FIG. 1 is defined as the vertical direction of the multistage press apparatus 1. The vertical direction of the multistage press device 1 coincides with the vertical direction.
Moreover, the left-right direction in FIG. 1 is defined as the left-right direction of the multistage press apparatus 1.

  As shown in FIG. 1, the multistage press device 1 includes a structure having an upper fixing portion 2, a lower fixing portion 3, guide posts 4, 4, 4, 4, a die plate 5, and die holders 6, 6. And an upper mold 10, a lower mold 20, and an intermediate mold 30 attached to the structure.

  First, a structure having the upper fixing portion 2, the lower fixing portion 3, the guide posts 4, 4, 4, 4, the die plate 5, and the die holders 6 and 6 will be described.

  The upper fixing portion 2 and the lower fixing portion 3 are substantially rectangular parallelepiped members. The upper fixing part 2 and the lower fixing part 3 are spaced apart from each other in the vertical direction, and are fixed via guide posts 4, 4, 4, 4 so as to face each other.

  The guide posts 4, 4, 4, 4 are substantially columnar members extending in the vertical direction. The guide posts 4, 4, 4, 4 are configured to connect the four corners of the lower surface of the upper fixing portion 2 and the four corners of the upper surface of the lower fixing portion 3. That is, the upper ends of the guide posts 4, 4, 4, 4 are fixed to the four corners of the lower surface of the upper fixing portion 2, and the lower ends of the guide posts 4, 4, 4, 4 are the four corners of the upper surface of the lower fixing portion 3. And are fixed.

The die plate 5 is a rectangular plate material, and is disposed with its plate surface directed in the vertical direction. The die plate 5 slides on the guide posts 4, 4, 4, 4 and is configured to be movable in the vertical direction on the upper mold 10 attached to the lower surface of the die plate 5.
Specifically, four through holes for inserting the guide posts 4, 4, 4, 4 are formed along the vertical direction at the four corners of the plate surface of the die plate 5. The sliding parts 5a, 5a, 5a, 5a formed so as to cover the outer peripheral surfaces of the guide posts 4, 4, 4, 4 are fixed.
The sliding portion 5a is a cylindrical member, and is configured to be slidable on the guide post 4.

The die plate 5 is connected to the upper fixing portion 2 via the connecting portion 5b.
The connecting portion 5 b is a toggle mechanism that connects the upper fixing portion 2 and the die plate 5. The connecting portion 5b is configured to expand and contract in the vertical direction by an actuator such as a hydraulic cylinder so that the die plate 5 can be moved in the vertical direction.
In addition, it is also possible not to provide the connection part 5b in the multistage press apparatus 1, but to comprise the die plate 5 so that it can move to an up-down direction directly with actuators, such as a hydraulic cylinder.

The die holders 6 and 6 are rectangular plate materials, and the plate surfaces thereof are arranged in the vertical direction. The die holders 6 and 6 are disposed between the lower fixing portion 3 and the die plate 5. The die holders 6 and 6 are fixed to the intermediate mold 30 with the intermediate mold 30 sandwiched from the left and right.
The left die holder 6 is configured to be slidable on the left guide post 4, 4, and the right die holder 6 is configured to be slidable on the right guide post 4, 4. The intermediate die 30 attached to the can be moved in the vertical direction.
Specifically, the left die holder 6 is formed with two through-holes through which the left guide posts 4 and 4 are inserted, and the right die holder 6 has the right guide posts 4 and 4. Two through holes for inserting the guide posts 4, 4, 4, 4 are formed in the four through holes so as to cover the outer peripheral surfaces of the guide posts 4, 4, 4, 4. The parts 6a, 6a, 6a and 6a are fixed.
The sliding portion 6a is a cylindrical member configured in substantially the same manner as the sliding portion 5a, and is configured to be slidable on the guide post 4.

Next, the upper mold 10, the lower mold 20, and the intermediate mold 30 will be described.
The upper mold 10, the lower mold 20, and the intermediate mold 30 are arranged along the vertical direction from the upper mold 10, the intermediate mold 30, and the lower mold 20 in this order, and constitute two processing parts for processing the workpiece. doing.
In the processing part composed of the lower mold 20 and the intermediate mold 30, the work is drawn, and at the same time, the work is bent in the processing part composed of the upper mold 10 and the intermediate mold 30. The workpiece that is bent by the upper die 10 and the intermediate die 30 is a workpiece that has been drawn by the lower die 20 and the intermediate die 30.
Thus, the upper mold | type 10, the lower mold | type 20, and the intermediate mold | type 30 are comprised so that a press work may be simultaneously performed with respect to two types of workpiece | work.

The upper mold 10 is a mold having a molding surface formed on the lower surface, and is fixed to the lower surface of the die plate 5.
The upper mold 10 includes an upper mold body 11 and a pad 12, and a molding surface 11 a of the upper mold body 11 and a molding surface 12 a of the pad 12 constitute a molding surface of the upper mold 10.
The upper mold body 11 is a main component of the upper mold 10. A concave portion that is recessed upward is formed in a central portion in the left-right direction of the upper mold main body 11, and a pad 12 is provided in the concave portion.
The pad 12 is provided in a recess formed in the upper mold main body 11 so as to be movable in the vertical direction. The pad 12 is urged downward by a predetermined urging means, and when the workpiece is bent by the upper die 10 and the intermediate die 30, the central portion in the left-right direction of the workpiece is combined with the intermediate die 30. Hold and restrain.

The lower mold 20 is a mold having a molding surface formed on the upper surface, and is fixed to the upper surface of the lower fixing portion 3.
The lower mold 20 includes a lower mold body 21 and a cushion ring 22, and a molding surface 21 a of the lower mold body 21 and a molding surface 22 a of the cushion ring 22 constitute a molding surface of the lower mold 20.
The lower mold body 21 is a main component of the lower mold 20, and a molding surface 21a is formed at a central portion in the left-right direction. The lower mold main body 21 is formed with a recess recessed downward so as to surround the molding surface 21a, and a cushion ring 22 is provided in the recess.
The cushion ring 22 is provided in a recess formed in the lower mold main body 21 so as to be movable in the vertical direction. The cushion ring 22 is biased upward by a predetermined biasing means, and when the workpiece is drawn by the lower die 20 and the intermediate die 30, the outer edge portion of the workpiece is sandwiched with the intermediate die 30. to bound.

The intermediate mold 30 is a mold manufactured as one member by a full mold casting method or the like. An upper molding surface 31 and a lower molding surface 32 are formed on the upper surface and the lower surface of the intermediate mold 30, respectively.
The upper molding surface 31 of the intermediate mold 30 is formed according to the shape of the molding surface of the upper mold 10 (the molding surface 11a of the upper mold body 11 and the molding surface 12a of the pad 12). 32 is formed according to the shape of the molding surface of the lower mold 20 (the molding surface 21a of the lower mold body 21 and the molding surface 22a of the cushion ring 22).
As described above, the intermediate mold 30 is constituted by one member, and the upper molding surface 31 and the lower molding surface 32 are formed on the upper surface and the lower surface, respectively.
Further, the intermediate die 30 is configured to be sandwiched from the side (in the present embodiment, left and right) by the die holders 6 and 6 without using a die plate. That is, the intermediate mold 30 is movable in the vertical direction via the die holders 6 and 6.
Accordingly, the height (vertical length) of the intermediate mold 30 can be reduced as compared with the conventional intermediate mold configured by fixing the upper mold and the lower mold to the upper and lower surfaces of the die plate. it can. Therefore, it is possible to reduce the size of the multistage press device 1.
A portion of the intermediate mold 30 where the upper molding surface 31 and the lower molding surface 32 are not formed is formed so as to project upward from the upper molding surface 31 and project downward from the lower molding surface 32. ing.

In the present embodiment, the entire intermediate mold 30 is configured as one member, but at least a portion where the upper molding surface 31 and the lower molding surface 32 are formed may be configured as one member.
In the present embodiment, one intermediate mold is provided. However, the number of intermediate molds is not limited, and it is sufficient that at least one intermediate mold is provided.

Below, with reference to FIGS. 2-7, the manufacturing process S1 of the intermediate mold | type 30 which is one Embodiment of the manufacturing method of the intermediate mold | type contained in the multistage press apparatus which concerns on this invention is demonstrated.
The manufacturing process S1 is a process for manufacturing the intermediate mold 30 by a full mold casting method.
Here, the full mold casting method is a casting method for producing a casting having the same shape as the model by embedding a model that disappears by the heat of the molten metal in sand and replacing the model with the molten metal.

  As shown in FIG. 2, the production process S1 includes a reinforcement process S11, a storage process S12, a first sand filling process S13, a second sand filling process S14, and a pouring process S15. Repeat in order.

As shown in FIG. 3, the reinforcing step S <b> 11 is a step of reinforcing the disappearance model 40 with the reinforcing member 50.
The vanishing model 40 is a polystyrene model generally used in a full mold casting method, and is formed in a shape substantially the same as that of the intermediate mold 30. In the vanishing model 40, a surface corresponding to the upper molding surface 31 of the intermediate mold 30 is a first surface 41, and a surface corresponding to the lower molding surface 32 of the intermediate mold 30 is a second surface 42.
The reinforcing member 50 is a foamed polystyrene member that reinforces the disappearance model 40 by supporting a portion of the disappearance model 40 where the first surface 41 and the second surface 42 are formed. When the vanishing model 40 is placed at a predetermined location such that the first surface 41 is located on the lower side and the second surface 42 is located on the upper side, the reinforcing member 50 The vanishing model 40 is reinforced by completely filling the gap formed between the surface 41 (see FIG. 4). That is, the reinforcing member 50 is formed in the same shape as the gap. The reinforcing member 50 can be manufactured based on CAD data of the intermediate mold 30 or the like.
The material of the reinforcing member 50 is not limited as long as the disappearance model 40 can be reinforced.

  In the reinforcing step S11, a reinforcing member 50 is attached to the vanishing model 40 so as to fill the gap, and the vanishing model 40 is reinforced.

As shown in FIG. 4, the storing step S <b> 12 is a step of storing the disappearance model 40 reinforced by the reinforcing member 50 in the reinforcing step S <b> 11 in the casting frame 60.
The casting frame 60 is a box-shaped casting frame generally used in a full mold casting method. The cast frame 60 includes a substantially rectangular parallelepiped main body portion 61 whose upper and lower surfaces are open, and a lid portion 62 that closes one open portion of the main body portion 61.
A plurality of main body portions 61 can be stacked in the vertical direction, and when the storing step S12 is performed, the two main body portions 61 and 61 are stacked.
The lid part 62 is disposed so as to close the lower open part of the two stacked main body parts 61 and 61. The lid 62 is not fixed to the lower main body 61 and can be easily switched between opening and closing of the lower surface of the main body 61.

In the storing step S12, the disappearance model 40 is stored in the casting frame 60 so that the first surface 41 and the second surface 42 are positioned along the vertical direction.
Specifically, the vanishing model 40 reinforced by the reinforcing member 50 is arranged such that the upper surface of the lid portion 62 of the casting frame 60 such that the first surface 41 is located on the lower side and the second surface 42 is located on the upper side. Placed on.
At this time, a gap formed between the upper surface of the lid portion 62 of the casting frame 60 and the first surface 41 is filled with the reinforcing member 50.
Further, the upper end surfaces of the two stacked main body portions 61 and 61 are positioned above the upper end surface of the vanishing model 40.

As shown in FIG. 5, the first sand filling step S <b> 13 is a step of putting the foundry sand 70 into the inside of the casting frame 60 in which the lost model 40 is accommodated in the accommodating step S <b> 12.
The foundry sand 70 is foundry sand generally used in the full mold casting method, and functions as a mold. The foundry sand 70 is obtained by adding a resin or the like to sand such as silica sand, and is hardened when a predetermined time elapses after being put into the casting frame 60.

In the first sand filling step S <b> 13, the foundry sand 70 is put into the casting frame 60 so that the disappeared model 40 reinforced by the reinforcing member 50 is buried in the foundry sand 70.
More specifically, the foundry sand 70 is put into the casting frame 60 until the foundry sand 70 reaches the height (position in the vertical direction) of the upper end surfaces of the two stacked main body portions 61 and 61 as a whole.
At this time, since the vanishing model 40 is reinforced by the reinforcing member 50, the portion of the vanishing model 40 where the first surface 41 and the second surface 42 are formed is bent or damaged by the weight of the foundry sand 70. This can be prevented.
Thereby, the thickness (distance from the 1st surface 41 to the 2nd surface 42) of the part in which the 1st surface 41 and the 2nd surface 42 in the vanishing model 40 were formed can be made small, and the vanishing model 40 is extended. The height (vertical length) can be reduced.
Therefore, the height of the intermediate mold 30 produced based on the disappearance model 40 can be reduced.

In the first sand filling step S <b> 13, the foundry sand 70 is poured into the casting frame 60 so that a pouring port 71 for pouring the molten metal is formed.
The pouring port 71 can be formed by, for example, throwing the foundry sand 70 into the casting frame 60 with a cylindrical member inserted into the disappearance model 40.

As shown in FIG. 6, in the second sand filling step S <b> 14, the casting frame 60 into which the casting sand 70 has been put in the first sand filling step S <b> 13 is turned upside down, and the casting sand 70 is newly put into the casting frame 60. It is a process to do.
In the second sand filling step S14, first, the casting frame 60 is turned upside down in a state where the foundry sand 70 put into the casting frame 60 in the first sand filling step S13 is cured.
Next, after removing the lid 62 of the casting frame 60, the reinforcing member 50 is removed from the disappearance model 40.
Finally, after one body portion 61 is further stacked on the two stacked body portions 61 and 61, the foundry sand 70 is newly placed in the casting frame 60 so that the disappeared model 40 is completely buried in the foundry sand 70 ( Specifically, it is put into the newly added main body 61).
In this way, the disappearance model 40 is completely buried in the foundry sand 70 put in the casting frame 60 (specifically, the three main body portions 61, 61, 61 stacked). The foundry sand 70 introduced into the inside of the casting frame 60 in the second sand filling step S <b> 14 is cured when a predetermined time elapses after being introduced into the casting frame 60.

The pouring step S15 is a step of supplying molten metal to the disappeared model 40 in the casting frame 60 into which the foundry sand 70 has been introduced in the second sand filling step S14.
In the pouring step S <b> 15, the molten sand reaches the disappearance model 40 by injecting a high-temperature molten metal into the pouring port 71 after the foundry sand 70 put in the casting frame 60 is hardened. And the disappearance model 40 lose | disappears with the heat | fever of a molten metal, and the space where the disappearance model 40 existed will be filled with a molten metal. That is, the disappearance model 40 is replaced with molten metal.
Thereafter, the solidified molten metal is taken out from the foundry sand 70 and subjected to predetermined processing, whereby the intermediate mold 30 is completed.

  The reinforcing member in the present invention is not limited to the reinforcing member 50 configured to fill the gap, and the following reinforcing member 150 can be applied.

  As shown in FIG. 7, the reinforcing member 150 is disposed in the gap, like the reinforcing member 50, and disappears by supporting the portion where the first surface 41 and the second surface 42 of the disappearance model 40 are formed. It is a member that reinforces the model 40. The reinforcing member 150 includes a plurality of upper contact portions 151, 151... And a plurality of side contact portions 152, 152.

The upper contact portion 151 protrudes upward, and a protruding end surface (see the hatched pattern portion in FIG. 7) is formed as a flat surface. A plurality of upper abutting portions 151 are formed in accordance with the position of the flat portion so that the protruding end surface abuts on the flat portion of the first surface 41 of the disappearance model 40.
Here, the flat portion of the first surface 41 in the disappearance model 40 is, for example, a surface for processing a portion of the upper molding surface 31 of the intermediate die 30 that will not eventually become a product (a portion to be removed later). It is a part corresponding to. In the intermediate mold 30, the molding surface for processing a part that finally becomes a product of the workpiece is mainly formed as a curved surface, but the molding surface for processing a part that does not finally become a product of the workpiece is , Mainly formed as a flat surface.
Therefore, using the flat portion of the first surface 41 of the disappearance model 40 corresponding to the flat portion of the upper molding surface 31 of the intermediate mold 30 instead of the curved surface portion of a complicated shape, a flat surface that contacts the flat portion is used. The upper abutting portion 151 having the reinforcing member 150 is formed.
In this way, by providing the reinforcing member 150 with a plurality of upper contact portions 151, 151,... Having a relatively simple structure, the shape of the portion where the first surface 41 and the second surface 42 of the disappearance model 40 are formed. The disappeared model 40 can be reinforced.
Even if the flat portion of the first surface 41 of the disappearance model 40 and the flat surface (projecting end surface) of the upper contact portion 151 of the reinforcing member 150 are not in good contact, the upper contact portion 151 is not Since the shape of the protruding end surface of the upper contact portion 151 is also flat according to the shape of the simple structure, that is, the shape of the flat portion of the first surface 41 in the disappearance model 40, the upper contact portion 151 is easily corrected. It is possible.

Note that a plurality of upper contact portions 151 are preferably provided in the reinforcing member 150 so as to be arranged to some extent evenly. However, in places where it is difficult to provide the upper contact portions 151, What is necessary is just to provide the upper contact part 151a contact | abutted to the curved surface part of the one surface 41. FIG.
The upper contact portion 151a is formed along the shape of the curved surface portion of the first surface 41 of the disappearance model 40 (see the black portion in FIG. 7). Since the curved surface portion of the first surface 41 in the vanishing model 40 has a complicated shape, it is desirable that the upper contact portion 151a is not provided on the reinforcing member 150 as much as possible.

The side contact portion 152 protrudes toward the side (direction perpendicular to the vertical direction), and the protruding end surface is formed as a flat surface. The side abutment portion 152 has a plurality of projection end faces in contact with the flat portion of the surface along the vertical direction of the surface forming the gap in the disappearance model 40 according to the position of the flat portion. Is formed.
Thus, even in the direction perpendicular to the vertical direction, the shape of the disappearance model 40 is maintained by using the flat portion of the disappearance model 40 and forming the side contact portion 152 that contacts the flat portion on the reinforcing member 150. The vanishing model 40 can be further reinforced.

As described above, the upper contact portion 151 and the side contact portion 152 are configured such that a flat surface is formed so as to contact the flat portion of the surface forming the gap in the disappearance model 40.
Thereby, the reinforcing member 150 can have a relatively simple configuration, and the disappearance model 40 can be easily reinforced.

  The reinforcing member 150 can be divided into a plurality of parts. By dividing the reinforcing member 150, it is possible to easily confirm whether the upper contact portion 151 and the side contact portion 152 and the disappearance model 40 are in proper contact for each divided piece.

  INDUSTRIAL APPLICABILITY The present invention can be used for a multistage press apparatus that performs press processing simultaneously on a plurality of workpieces, and an intermediate mold manufacturing method included therein.

DESCRIPTION OF SYMBOLS 1 Multistage press apparatus 10 Upper mold | type 20 Lower mold | type 30 Intermediate mold 31 Upper molding surface 32 Lower molding surface 40 Vanishing model 41 1st surface 42 2nd surface 50 Reinforcement member 60 Cast frame 61 Main body part 62 Lid part 70 Foundry sand 71 Notes Pouring gate 150 Reinforcing member 151 Upper contact portion 152 Side contact portion

Claims (4)

A multi-stage press device that performs press processing simultaneously on a plurality of workpieces,
An upper mold having a molding surface formed on the lower surface, a lower mold having a molding surface formed on the upper surface, and at least one intermediate mold disposed between the upper mold and the lower mold,
The intermediate mold is formed with molding surfaces on the upper surface and the lower surface, respectively.
The portion where the two molding surfaces in the intermediate mold are formed is constituted by one member.
A multi-stage press device characterized by that. A method for producing an intermediate mold included in the multistage press device according to claim 1,
In the model formed in the same shape as the intermediate mold, a reinforcing step for reinforcing the model by a reinforcing member that supports a portion in which a surface corresponding to two molding surfaces of the intermediate mold is formed;
A storing step of storing the model reinforced in the reinforcing step inside the box-shaped casting frame so that surfaces corresponding to the two molding surfaces of the intermediate mold in the model are positioned along the vertical direction. When,
A first sanding step of putting casting sand that functions as a mold into the inside of the casting frame in which the model is stored in the storing step;
The second sand in which the casting sand into which the casting sand has been thrown in the first sand filling step is turned upside down and the reinforcing member is removed from the model, and then the casting sand is put into the inverted casting frame. Filling process,
A pouring step of supplying molten metal to the model in the casting frame into which the foundry sand has been charged in the second sand filling step,
An intermediate mold manufacturing method characterized by the above. The reinforcing member fills a gap formed between a surface corresponding to one molding surface of the intermediate mold and a mounting surface in the model housed in the casting frame in the housing step. Configured as
The method for producing an intermediate mold according to claim 2. The reinforcing member is disposed in a gap formed between a surface corresponding to one molding surface of the intermediate mold and a mounting surface in the model housed in the casting frame in the housing step. And having a plurality of flat surfaces in contact with the flat portion of the surface forming the gap in the model,
The method for producing an intermediate mold according to claim 2.

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