JP5616180B2 - Mold for casting and manufacturing method thereof - Google Patents

Description

  The present invention relates to a casting mold and a manufacturing method thereof, and more particularly, a casting mold including a nest that forms a substantially L-shaped cavity and a mold body that holds the nest, and a manufacturing method thereof. Regarding the method.

Conventionally, a casting mold is composed of a fixed mold attached to a fixed side of a die cast machine and a movable mold attached to a movable side.
The fixed mold includes a nest having a recess to form a cavity, and the movable mold has a convex portion facing the recess to form a cavity in cooperation with the fixed mold nest. However, depending on the shape of the product to be manufactured, the movable mold is provided with a nest in which a concave portion for forming a cavity is formed, and the fixed mold has a convex portion facing the concave portion. In some cases, a nest is formed that cooperates with the nest of the mold to form a cavity.
Further, when casting a product having a complicated shape, the movable mold has a divided structure, and includes a slide type such as a top side slide type, a ground type slide type, a right side slide type, and a left side slide type. In this case, for example, an insert in which a recess for forming a cavity is formed in the movable mold has a convex portion facing the recess in the slide mold, and the cavity is formed in cooperation with the insert of the movable mold. Nests may be placed.
The insert forming the cavity is subjected to heat treatment in order to impart hardness and toughness suitable for die casting.

  In recent years, the size of the products to be cast has increased, and in order to reduce the cost of products that have been separately cast in the past, it is possible to cast a large number of products with a single mold. In order to do so, the nesting has become larger. However, when the insert is enlarged, it becomes difficult to perform heat treatment uniformly. If the nest is not heat-treated uniformly, the hardness and toughness may become uneven and cracks may occur.

Patent Document 1 includes a first insert held by the mold body and a second insert fitted and held in the first insert as a countermeasure against these, A die-casting mold is described in which the nesting is formed to a minimum size surrounding the cavity recess.
According to this die-casting mold, the insert is composed of a first insert and a second insert, and the second insert is formed to a minimum size surrounding the cavity recess, Since each insert is downsized, the heat treatment of the insert can be performed uniformly.

WO2007 / 018063

  However, if the inserts are divided and the shape of each insert is reduced, heat treatment can be performed uniformly. However, if the inserts are divided too much, the assembly accuracy when assembled as a mold cannot be secured sufficiently. Due to the gaps created between the inserts, burrs are generated in the cast product, the joint between the divided inserts is displaced, and the assembled mold is deformed. There was a fear.

  An object of the present invention is to provide a casting mold that can uniformly perform heat treatment and can prevent the assembly accuracy of divided nests from being lowered.

(1) A nesting (for example, movable side nesting 12) that forms a substantially L-shaped cavity (for example, cavity 50), and a mold body (for example, movable side mold body 11) that holds the nesting. The mold body has a substantially L-shaped recess (for example, the recess 110) for holding the insert divided along the substantially L-shaped cavity. The first insert (e.g., first insert 121) disposed at a position (e.g., position 111) corresponding to the bottom surface of the substantially L-shaped recess, A second nesting (for example, second nesting 122) disposed at a position facing the first nesting (for example, position 112), the first nesting, and the second nesting; A third insert (for example, the third insert 123) disposed between the upper portion of the substantially L-shaped concave portion. Surface (e.g., top one side 114) a fourth insert disposed (e.g., the fourth insert 124) and a said first nesting, the second nesting, the third A casting mold (for example, casting mold 1) in which each of the insert and the fourth insert is formed to have a constant thickness .

  According to (1), the nest that forms the substantially L-shaped cavity includes the first nest disposed at a position corresponding to the bottom surface of the substantially L-shaped recess of the mold body, and the first nest. A second insert disposed at a position facing the insert of the first insert, a third insert disposed between the first insert and the second insert, and a substantially L-shape of the mold body And a fourth nest disposed on the upper side surface of the shaped recess.

As a result, the nests forming the substantially L-shaped cavities are divided according to the shape of the cavities, so that the size of each nest can be reduced and formed with a certain thickness. The child can be prevented from being distorted. Further, since the temperature is equalized during the heat treatment, a uniform heat treatment can be performed.
Furthermore, although the cavity is substantially L-shaped, since the insert is divided according to the substantially L-shape, a casting mold can be formed without lowering the assembly accuracy of the divided insert.
Therefore, it is possible to provide a casting mold that can uniformly perform the heat treatment and can prevent the assembly accuracy of the divided inserts from being lowered.

  (2) The second nest has a length that does not reach the upper one side surface of the substantially L-shaped cavity (for example, the upper one side surface 51 of the cavity), and is substantially L-shaped in the mold body. It has a protrusion (e.g., protrusion 122a) formed to a length that reaches one or more upper side surfaces of the recess, and the fourth nest is a notch (e.g., notch) that engages with the protrusion. The casting mold according to (1), further comprising a notch portion 124a), wherein the casting mold is fitted into the mold body and the second insert.

  According to (2), the second nest has a length that does not reach the upper side surface of the substantially L-shaped cavity and that reaches the upper side surface of the recess of the mold body. The fourth nest includes a notch (for example, a notch 124a) that engages with the protrusion, and the mold body and the second nest. Fitted with a seal.

As a result, the fourth insert has a notch that engages the protrusion of the second insert and is stamped into the mold body and the second insert, so that the insert that forms the cavity Assembling accuracy of the corner part can be improved.
Therefore, it is possible to provide a casting mold that can uniformly perform the heat treatment and can prevent the assembly accuracy of the divided inserts from being lowered.

  (3) In the method for manufacturing a casting mold according to (1) or (2), the first nesting and the position corresponding to the substantially L-shaped bottom surface of the recess and the position facing the position are A step of arranging the second inserts and fixing the second inserts to the mold body; and a third insert disposed between the first inserts and the second inserts to the mold body A method for manufacturing a casting mold, comprising: a fixing step; and a step of disposing the fourth insert on one upper side surface of the recess.

  According to (3), first, the first insert and the second insert are respectively arranged at a position corresponding to the substantially L-shaped bottom surface of the recess in the mold body and a position facing the position. Secure to the mold body. Next, a third insert is disposed between the first insert and the second insert, and is fixed to the mold body. And a 4th nest | insert is arrange | positioned to the upper one side surface of a recessed part.

As a result, the adjacent nestings such as the first nesting and the third nesting, the second nesting and the third nesting, and the second nesting and the fourth nesting, Since the other insert is fixed to the mold body after the insert is fixed to the mold body, it is possible to prevent the assembly accuracy of the divided inserts from being lowered.
Therefore, it is possible to provide a method for manufacturing a casting mold that can prevent the assembly accuracy of the inserts divided so that the heat treatment can be performed uniformly.

  According to this invention, it is possible to provide a casting mold that can uniformly perform heat treatment and can prevent the assembly accuracy of the divided inserts from being lowered.

It is a figure which shows the structure of the metal mold | die for casting which concerns on one embodiment of this invention. It is a perspective view of the movable side metal mold | die which concerns on the said embodiment. It is a figure explaining the manufacturing method of the movable side metal mold | die which concerns on the said embodiment. (A) is a figure explaining the process of fixing the 1st nest and the 2nd nest to a movable side metallic mold body. (B) is a figure explaining the process of fixing a 3rd nest to a movable side metallic mold body. (C) is a figure explaining the process of arrange | positioning a 4th nest | insert to a movable-side mold main body. It is a figure explaining the procedure which forms a cavity with the metal mold | die for casting which concerns on the said embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a casting mold 1 according to an embodiment of the present invention.
The casting mold 1 includes a movable mold 10 attached to the movable side of a die cast machine (not shown), a fixed mold 20 attached to the fixed side of the die cast machine, and a cylinder unit ( And a slide mold 30 inserted to a predetermined position in a cavity 115 formed between the movable mold 10 and the fixed mold 20.
In the casting mold 1, a substantially L-shaped cavity 50 is formed by a movable mold 10, a fixed mold 20 and a slide mold 30. When the molten metal flows into the cavity 50, a substantially L-shaped product is cast.

The movable-side mold 10 includes a movable-side insert 12 that forms part of a substantially L-shaped cavity 50, and a movable-side mold that holds the movable-side insert 12 and is attached to a die-cast machine (not shown). And a mold body 11.
The movable mold body 11 includes a substantially L-shaped recess 110 for holding the movable insert 12. The movable mold body 11 has a movable mold body joint surface 11a that joins to a fixed mold body joint surface 21a of a fixed mold body 21 of the fixed mold 20 described later.
The recess 110 has a position 111 corresponding to a substantially L-shaped bottom surface (arrow B side in FIG. 1), a position 112 facing the position 111, and one lower side surface formed between the position 111 and the position 112. 113 and an upper one side surface 114 formed on the arrow T side from the position 112.

  The movable side insert 12 includes a first insert 121 disposed at a position 111 corresponding to the bottom surface of the recess 110, a second insert 122 disposed at a position 112 of the recess 110, and a lower portion of the recess 110. A third insert 123 disposed on the side surface 113 and a fourth insert 124 disposed on the upper one side surface 114 of the recess 110 are provided.

The first insert 121 is fixed to the position 111 of the movable mold body 11 by a bolt (not shown). The tip of the first insert 121 protrudes from the movable mold body joint surface 11a and engages with a first insert engaging portion 21b of the fixed mold body 21 described later. Thereby, it is possible to prevent the molten metal flowing into the cavity 50 from flowing out from the joint portion between the movable mold body 11 and the fixed mold body 21.
The second insert 122 is fixed to the position 112 of the movable mold body 11 by a bolt (not shown). Further, the second insert 122 has a length that does not reach the cavity upper side surface 51 of the cavity 50 formed by the fourth insert 124, and the upper side surface of the concave portion 110 of the movable mold body 11. The protrusion part 122a formed in the length which reaches 114 or more is provided. The protrusion 122a is formed to have a length that is approximately half the thickness of the fourth nest 124.
The first nest 121 and the second nest 122 are formed of a quenching material. Thereby, the 1st insert 121 and the 2nd insert 122 become high hardness, and can suppress the deformation | transformation by the heat | fever etc. of molten metal.

  The third insert 123 is fixed to the lower one side surface 113 of the movable mold body 11 so as to be sandwiched between the first insert 121 and the second insert 122 by a bolt (not shown). Thereby, the 3rd insert 123 can prevent the deformation | transformation and the shift | offset | difference to the arrow T side or B side by the 1st insert 121 and the 2nd insert 122 with high hardness.

The fourth nesting 124 will be described with reference to FIG.
FIG. 2 is a perspective view of the movable mold 10 according to the embodiment.
FIG. 2 shows a state in which the first insert 121, the second insert 122, and the third insert 123 are fixed to the movable mold body 11, and the fourth insert 124 is not fixed. Yes.
The fourth insert 124 is disposed on the upper one side surface 114 of the movable mold body 11. The fourth insert 124 includes a cutout portion 124a that engages with the protruding portion 122a of the second insert 122, and is fixed to the movable mold body 11 and the second insert 122 by stamping fitting. . Thereby, the movement of the fourth nesting 124 on the arrow LR side is regulated by the movable mold body 11, and the movement of the arrow TB side is regulated by the movable mold body 11 and the second nesting 122. .

Returning to FIG. 1, the fixed-side mold 20 includes a fixed-side insert 22 that forms a part of the cavity 50, and a fixed-side that holds the fixed-side insert 22 and is attached to a die cast machine (not shown). A mold body 21.
The fixed-side mold body 21 includes a substantially U-shaped recess 210 for holding the fixed-side insert 22. The fixed-side mold body 21 has a fixed-side mold body joint surface 21 a that joins the movable-side mold body joint surface 11 a of the movable-side mold body 11 of the movable-side mold 10. The fixed-side mold main body 21 includes a first insert engaging portion 21b that engages with the tip of the first insert 121, a slide type engaging portion 21c that engages with the tip of the slide die 30, Is provided.
The fixed side insert 22 is fixed to the recess 210 by a bolt (not shown).

As shown in FIG. 2, two slide molds 30 are provided so as to face each other on the LR axis, and by a cylinder unit (not shown) of a die-cast machine (not shown), from the arrow L side to the arrow R side and Inserted from the arrow R side to the arrow L side, respectively. The slide mold 30 includes a core base 31 attached to a cylinder unit (not shown), and a core 32 formed from the core base 31 in a direction facing each other.
As shown in FIG. 1, when the slide mold 30 is inserted to a predetermined position in the cavity 115, the tip of the slide mold 30 projects from the movable mold body joint surface 11 a, and the slide mold engagement of the fixed mold body 21 is performed. Engages with part 21c. Thereby, it can prevent that a slide type | mold expands by the injection pressure and surge pressure when a molten metal flows in.

When the movable mold 10 and the fixed mold 20 are combined, the casting mold 1 includes the first insert 121, the second insert 122, the third insert 123, and the like of the movable mold 10. A cavity 115 surrounded by four sides is formed by the fourth insert 124 and the fixed side insert 22 of the fixed side mold 20.
In the casting mold 1, the slide molds 30 are inserted and arranged from both ends of the cavity 115 to predetermined positions to form the cavity 50.

Next, a method for manufacturing the movable mold 10 will be described.
FIG. 3 is a diagram illustrating a method for manufacturing the movable mold 10. (A) is a figure explaining the process of fixing the 1st insert 121 and the 2nd insert 122 to the movable mold main body 11. FIG.
(B) is a figure explaining the process of fixing the 3rd insert 123 to the movable mold main body 11. FIG.
(C) is a figure explaining the process of arrange | positioning the 4th nest | insert 124 to the movable mold main body 11. FIG.

First, as shown in FIG. 3A, the first insert 121 is arranged at the position 111 of the movable mold body 11 and fixed to the movable mold body 11 with a bolt (not shown). Thereby, the side surface 11b that forms the cavity 115 of the movable mold body 11 and the surface 121a that forms the cavity 115 of the first insert 121 become substantially flush.
Further, as shown in FIG. 3A, the second insert 122 is disposed at the position 112 of the movable mold body 11 and fixed to the movable mold body 11 with a bolt (not shown). Thereby, the side surface 11b that forms the cavity 115 of the movable mold body 11 and the surface 122b that forms the cavity 115 of the second insert 122 become substantially flush with each other.

  Next, as shown in FIG. 3B, the third insert 123 is arranged on the lower side surface 113 of the movable mold body 11 between the first insert 121 and the second insert 122. Then, it is fixed to the movable mold body 11 with bolts (not shown). Thereby, the bottom surface 11c that forms the cavity 115 of the movable mold body 11 and the surface 123a that forms the cavity 115 of the third insert 123 become substantially flush.

  Next, as shown in FIG. 3C, the fourth insert 124 is disposed on the upper one side surface 114 of the movable mold body 11. Specifically, the notch portion 124a of the fourth insert 124 is engaged with the protruding portion 122a of the second insert 122 and pushed into the upper side surface 114 of the movable mold body 11 so that the fourth insert The child 124 is fitted to the movable mold body 11 and the second insert 122 by stamping. Thereby, the surface 122b which forms the cavity 115 of the 2nd insert 122, and the surface 124b which forms the cavity 115 of the 4th insert 124 become substantially flush.

Next, a procedure for forming a cavity with the casting mold 1 will be described.
FIG. 4 is a diagram for explaining a procedure for forming a cavity by the casting mold 1. In FIG. 4, for convenience of understanding, the movable mold 10 and the fixed mold 20 are arranged on different axes, but the movable mold 10 and the fixed mold 20 are arranged on the same axis. Has been.
First, a die-cast machine (not shown) inserts the slide mold 30 from both ends of the cavity 115 to a predetermined position by a cylinder unit (not shown).
Next, the die-casting machine moves the movable mold 10 to the fixed mold 20, disposes the fourth insert 124 inside the fixed insert 22, and moves the tip of the first insert 121. Is engaged with the first insert engaging portion 21b, the tip of the slide mold 30 is engaged with the slide mold engaging portion 21c, and the movable mold body joint surface 11a of the movable mold body 11 is fixed to the fixed side. The fixed mold body joining surface 21a of the mold body 21 is joined, and the movable mold 10, the fixed mold 20 and the slide mold 30 are combined. Thereby, a cavity surrounded by the movable mold 10, the fixed mold 20 and the slide mold 30 is formed.

According to this embodiment, there exist the following effects.
According to the casting mold 1 of the present embodiment, the movable-side insert 12 that forms the substantially L-shaped cavity 50 is a position corresponding to the bottom surface of the substantially L-shaped recess 110 of the movable-side mold body 11. 111, a first nest 121 arranged at 111, a second nest 122 arranged at a position 112 facing the first nest 121, and the first nest 121 and the second nest The third insert 123 disposed between the first insert 122 and the fourth insert 124 disposed on the upper one side surface 114 of the substantially L-shaped recess 110 of the movable mold body 11 is provided.

Thereby, since the movable side insert 12 forming the substantially L-shaped cavity 50 is divided according to the shape of the cavity 50, the size of each of the first insert 121 to the fourth insert 124 is set. Since it can be formed in a small and constant thickness, it is possible to prevent the nest from being distorted during heat treatment. Further, since the temperature is equalized during the heat treatment, a uniform heat treatment can be performed.
Furthermore, although the cavity 50 is substantially L-shaped, since the movable-side insert 12 is divided in accordance with this substantially L-shape, the assembly of the divided first insert 121 to fourth insert 124 is performed. The casting mold 1 can be formed without reducing accuracy.
Therefore, it is possible to provide a casting mold that can uniformly perform the heat treatment and can prevent the assembly accuracy of the divided inserts from being lowered.

  Further, the second insert 122 has a length that does not reach the upper cavity side surface 51 of the substantially L-shaped cavity 50 and that reaches the upper upper side surface 114 or more of the recess 110 of the movable mold body 11. The fourth insert 124 includes a notch 124a that fits into the protrusion 122a, and is stamped into the movable mold body 11 and the second insert 122. Combined.

As a result, the fourth insert 124 is engaged with the projecting portion 122a of the second insert 122 by the notch portion 124a and is stamped into the movable mold body 11 and the second insert 122. Therefore, the assembly accuracy of the corner portion of the movable side insert 12 that forms the cavity 50 can be improved.
Therefore, it is possible to provide a casting mold that can uniformly perform the heat treatment and can prevent the assembly accuracy of the divided inserts from being lowered.

  Further, according to the method for manufacturing the casting mold 1 of the present embodiment, first, at the position 111 and the position 111 corresponding to the substantially L-shaped bottom surface of the approximately L-shaped recess 110 of the movable-side mold body 11. The first insert 121 and the second insert 122 are arranged at the facing position 112 and fixed to the movable mold body 11. Next, a third insert 123 is arranged between the first insert 121 and the second insert 122 and fixed to the movable mold body 11. Then, a fourth insert 124 is disposed on the upper side surface 114 of the substantially L-shaped recess 110 of the movable mold body 11.

As a result, the first insert 121 and the third insert 123, the second insert 122 and the third insert 123, and the second insert 122 and the fourth insert 124 are adjacent to each other. Since one insert is fixed to the movable mold body 11 after the other insert is fixed to the movable mold body 11, the assembly accuracy of the divided movable side insert 12 is improved. It can be prevented from decreasing.
Therefore, it is possible to provide a method for manufacturing a casting mold that can prevent the assembly accuracy of the inserts divided so that the heat treatment can be performed uniformly.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Casting die 11 Movable side die main body 110 Recessed part 111 Position 112 Position 114 Upper one side surface 12 Movable side insert 121 First insert 122 Second insert 123 123 Third insert 124 Fourth insert 50 cavities

Claims (3)

In a casting mold comprising a nest that forms a substantially L-shaped cavity, and a mold body that holds the nest,
The mold body includes a substantially L-shaped concave portion for holding the insert divided along the substantially L-shaped cavity,
The nesting is
A first nest disposed at a position corresponding to the bottom surface of the substantially L-shaped recess,
A second nest disposed at a position facing the first nest;
A third nesting disposed between the first nesting and the second nesting;
A fourth nesting disposed on the upper side surface of the substantially L-shaped recess ,
The first nesting, the second nesting, the third insert and the casting mold, each of said fourth insert is characterized Rukoto formed to a constant thickness. The second nesting has a length that does not reach the upper one side surface of the substantially L-shaped cavity and reaches a length that reaches or exceeds the upper one side surface of the substantially L-shaped concave portion of the mold body. With formed protrusions,
2. The casting according to claim 1, wherein the fourth nesting includes a notch portion that engages with the projecting portion, and the stamp is fitted to the mold body and the second nesting. Mold. In the manufacturing method of the casting die according to claim 1 or 2,
Placing the first insert and the second insert at positions corresponding to the substantially L-shaped bottom surface of the recess and facing the position, respectively, and fixing the mold to the mold body;
Arranging the third insert between the first insert and the second insert and fixing the third insert to the mold body;
And a step of disposing the fourth insert on the upper side surface of the concave portion.

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