JP2012125815A - Mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that can form different sorts of products without causing a shortage of strength of a mold.SOLUTION: The mold can form different sorts of products. The mold includes: an insert die formed with a cavity surface; an inside main die disposed on the back side of the insert die; and an outside main die having a penetration area for storing the inside main die therein. The mold is configured such that the insert die and the inside main die are exchangeable according to the sort of a product to be formed.

Description

  The present invention relates to a mold.

  In recent production lines, so-called high-mix low-volume production has become common. Along with this, the cycle for exchanging the mold is shortened.

  Therefore, for example, a technique in which the fixed mold and the movable mold constituting the mold are divided into a dedicated part for forming a cavity and a general-purpose part that is shared, and only the dedicated part is replaced for each product, for example, is a patent. It is disclosed in Documents 1-5.

Japanese Patent Laid-Open No. 2003-191065 JP 2004-276447 A JP 2005-169487 A JP 2006-315058 A JP 2010-131926 A

  It is necessary to form some through holes in a portion of the main mold that is disposed on the back side of the insert. For example, an extrusion hole needs to be formed in order to penetrate an extrusion pin for extruding a molded product from a mold. Moreover, when forming a cast part in a molded product, it is necessary to form a cast hole for penetrating a cast pin. Further, it is necessary to form a tightening bolt hole for fixing the nest and the main mold with a tightening bolt, and a cooling water forward path and a cooling water return path for circulating cooling water through the nest.

  The positions of the various holes described above are determined according to the shape of the product. Therefore, the position of each hole is unique to the product, and when forming a different product, it is necessary to change the position of these holes.

  In order to be able to mold different types of products, if holes corresponding to each product are pre-formed in the part of the main mold that is arranged on the back side of the insert, it will be inserted according to the product to be molded. Only the child can be replaced, and the main mold can be used without replacement. However, if a large number of holes are formed in the main mold, the strength of the mold is reduced, and it becomes impossible to withstand the pressure during molding. In order to prevent insufficient strength of the mold, it is not desirable to form unnecessary holes in the main mold. A technique that enables different types of products to be molded without causing a lack of strength of the mold is expected.

  The invention according to the present application solves the above problems. In the present specification, a technique capable of forming different types of products without causing insufficient strength of the mold is disclosed.

  The mold disclosed in this specification is a mold capable of molding different types of products. The mold includes an insert having a cavity surface, an inner main mold disposed on the back side of the insert, and an outer main mold that has a through region and accommodates the inner main mold in the through region. ing. The mold is characterized in that the insert and the inner main mold can be exchanged according to the type of product to be molded.

  In the above-described mold, when different types of products are molded, not only the insert having the cavity surface formed but also the inner main mold disposed on the back side of the insert can be exchanged. Therefore, when molding products with different shapes, even if it is necessary to change the position of the extrusion pin or core pin, the position where the tightening bolt is fastened, or the arrangement of the cooling water return path or cooling water return path The inner main mold can be replaced with the inner main mold, and the outer main mold can be used without replacement. The outer main mold can be commonly used for molding various products. Moreover, since it is sufficient to form only the necessary minimum holes in the inner main mold, there is no insufficiency of the mold strength. According to the mold described above, different types of products can be molded without causing a lack of strength of the mold.

  In the above mold, various holes are formed in the inner main mold as necessary. For example, the inner main mold may be formed with an extrusion hole through which an extrusion pin penetrates, or the inner main mold may be formed with a casting hole through which a casting pin penetrates. The inner main mold may be formed with a tightening bolt hole through which a tightening bolt for fixing the insert and the inner main mold passes. Furthermore, a cooling water forward path and a cooling water return path for circulating cooling water through the nest may be formed in the inner main mold. These holes are formed in the inner main mold as needed.When changing the position of these holes when molding different types of products, the inner main mold is replaced with the inner main mold. It can be used as it is without changing the mold.

  According to the mold disclosed in the present specification, different types of products can be molded without causing the mold to have insufficient strength.

It is a figure which shows typically the structure of the molding machine 10 provided with the fixed metal mold | die 16 and the movable metal mold | die 18 of an Example. It is sectional drawing which shows typically the structure of the fixed metal mold | die 16 of an Example. It is sectional drawing which shows typically the structure of the movable mold 18 of an Example.

The metal mold | die of a present Example is demonstrated with reference to drawings.
FIG. 1 shows a molding machine 10 having a mold according to this embodiment. The molding machine 10 is an injection molding machine capable of molding a plurality of types of products. The molding machine 10 is used for die casting, for example.

  The molding machine 10 includes a fixed platen 12 and a movable platen 14. A fixed mold 16 having a cavity surface is attached to the fixed platen 12. A movable mold 18 having a cavity surface is attached to the movable platen 14. Hereinafter, for the fixed mold 16 and the movable mold 18, the side on which the cavity surface is formed is referred to as the front side, and the opposite side is referred to as the back side. The movable platen 14 advances and retreats with respect to the fixed platen 12 along the tie bar 22 by driving the mold clamping cylinder 20. As the movable platen 14 moves forward with respect to the fixed platen 12, the fixed die 16 and the movable die 18 are brought into close contact with each other, and a cavity for forming a product is formed.

  The fixed platen 12 is provided with a sleeve 24 for receiving molten metal. The molten metal is injected from the sleeve 24 into the cavity formed by the fixed mold 16 and the movable mold 18 so that the product is molded.

  The fixed platen 12 is provided with a casting mechanism 26 for casting a molded product. The casting mechanism 26 includes a casting pin 28 that penetrates the fixed mold 16 from the back side and protrudes into the cavity. The core pin 28 can be advanced and retracted, and when the molten metal is injected into the cavity, the core pin 28 penetrates the fixed mold 16 and protrudes into the cavity.

  When the molten metal in the cavity is solidified and a product is formed, the casting mechanism 26 moves the casting pin 28 backward. Thereafter, when the mold clamping cylinder 20 is driven, the movable platen 14 moves backward with respect to the fixed platen 12 so that the fixed mold 16 and the movable mold 18 are opened. The movable platen 14 is provided with an extrusion mechanism 30 for extruding a molded product from the movable mold 18. The extrusion mechanism 30 includes an extrusion pin 32 that penetrates the movable mold 18 from the back side. The extrusion pin 32 can be advanced and retracted, and the molded product is extruded from the movable die 18 by the advancement of the extrusion pin 32 with the fixed die 16 and the movable die 18 being opened.

  The fixed mold 16 is supplied with cooling water from the fixed mold cooling system 34. The movable mold 18 is supplied with cooling water from the movable mold cooling system 36.

  As shown in FIG. 2, the fixed mold 16 includes an insert 38, a back block 40 (corresponding to the inner main mold), and a frame main mold 42 (corresponding to the outer main mold). A cavity surface is formed on the front side (left side in FIG. 2) of the insert 38. On the back side (right side in FIG. 2) of the insert 38, the back block 40 is disposed in close contact with the insert 38. The insert 38 is fixed to the back block 40 by a fastening bolt 54 that penetrates the back block 40 from the back side. The frame-shaped main mold 42 includes a hollow penetrating region penetrating from the front side to the back side, and the back block 40 is fitted into the penetrating region of the frame-shaped main mold 42. The back-side block 40 is fixed to the frame-shaped main mold 42 by fastening bolts 56 that penetrate the back-side block 40 from the back side.

  A cooling water circulation path 44 is formed inside the insert 38. A cooling water forward path 46 and a cooling water return path 48 are formed in the back block 40, respectively. The cooling water forward path 46 communicates one end of the cooling water circulation path 44 of the insert 38 with the cooling water supply path 50 extending from the fixed mold cooling system 34. The cooling water return path 48 communicates with the other end of the cooling water circulation path 44 of the insert 38 and a cooling water discharge path 52 extending from the fixed mold cooling system 34.

  In addition to the above-described cooling water circulation path 44, the insert 38 is formed with holes such as a cast hole 58 through which the cast pin 28 of the cast mechanism 26 passes, and a tightening bolt hole 60 to which the tightening bolt 54 is fastened. ing. Corresponding to these holes, the back block 40 also has a cooling water forward path 46 and a cooling water return path 48, a cast hole 62 through which the core pin 28 passes, a tightening bolt hole 64 through which the tightening bolt 54 passes, and the like. Holes are formed.

  As shown in FIG. 3, the movable mold 18 includes a nest 66, a back block 68 (corresponding to the inner main mold), and a frame-shaped main mold 70 (corresponding to the outer main mold). A cavity surface is formed on the front side of the insert 66 (the right side in FIG. 3). On the back side (left side in FIG. 3) of the insert 66, the back block 68 is disposed in close contact with the insert 66. The insert 66 is fixed to the back block 68 by fastening bolts 72 that penetrate the back block 68 from the back side. The frame-shaped main mold 70 includes a hollow penetrating region that penetrates from the front side to the back side, and the back block 68 is fitted into the penetrating region of the frame-shaped main mold 70. The back block 68 is fixed to the frame-shaped main mold 70 by fastening bolts 74 that penetrate the back block 68 from the back side.

  A cooling water circulation path 76 is formed inside the insert 66. A cooling water forward path 78 and a cooling water return path 80 are formed in the back block 68, respectively. The cooling water forward path 78 communicates one end of the cooling water circulation path 76 of the nest 66 with a cooling water supply path 82 extending from the movable mold cooling system 36. The cooling water return path 80 communicates with the other end of the cooling water circulation path 76 of the insert 66 and a cooling water discharge path 84 extending from the movable mold cooling system 36.

  In addition to the cooling water circulation path 76 described above, holes such as an extrusion hole 86 through which the extrusion pin 32 of the extrusion mechanism 30 passes and a fastening bolt hole 88 to which the fastening bolt 72 is fastened are formed in the insert 66. Corresponding to these holes, the back block 68 also has holes such as a cooling water forward path 78 and a cooling water return path 80, an extrusion hole 90 through which the extrusion pin 32 penetrates, and a fastening bolt hole 92 through which the fastening bolt 72 penetrates. Is formed.

  In the molding machine 10 of the present embodiment, when products having slightly different shapes are molded, that is, the inserts 38 and 66 are exchanged in accordance with the change of the cavity surface, the positions of the extrusion pin 32 and the core pin 28 are changed. If there is no need to change the position where the tightening bolts 54, 72 are fastened or the arrangement of the cooling water forward paths 46, 78 and the cooling water return paths 48, 80, the holes formed in the back blocks 40, 68 are provided. It can be used as it is. Therefore, in this case, only the insert 38 of the fixed mold 16 and the insert 66 of the movable mold 18 are exchanged, and the back block 40, the frame main mold 42, and the movable mold 18 of the fixed mold 16 are exchanged. The back block 68 and the main frame 70 can be used as they are without being exchanged.

  However, when molding products having greatly different shapes, the positions of the extrusion pin 32 and the core pin 28 may be changed accordingly. Further, the position where the tightening bolts 54 and 72 are fastened may be changed in accordance with the large change in the shape of the cavity surface. Further, the layout of the cooling water circulation paths 44 and 76 of the inserts 38 and 66 is changed in accordance with the large change in the shape of the cavity surface, and the cooling water outward paths 46 and 78 of the back blocks 40 and 68 are accordingly changed. The arrangement of the water return paths 48 and 80 may be changed. In such a case, it is necessary to change the positions of the holes formed in the back blocks 40 and 68. Therefore, in this case, the insert 38 and the back block 40 of the fixed mold 16 and the insert 66 and the back block 68 of the movable mold 18 are exchanged, and the frame-shaped main mold 42 and the movable mold of the fixed mold 16 are exchanged. The frame-shaped main mold 70 of the mold 18 is used as it is without being exchanged.

  In the molding machine 10 of the present embodiment, the back-side blocks 40 and 68 disposed on the back side of the inserts 38 and 66 and the frame-shaped main molds 42 and 70 that hold the back-side blocks 40 and 68 from the surroundings are separate members. It is configured as. By adopting such a configuration, when products having greatly different shapes are formed, that is, the positions of the extrusion pins 32 and the casting pins 28, the positions where the tightening bolts 54 and 72 are fastened, and the cooling water paths 46 and 78. Even if it is necessary to change the arrangement of the cooling water return paths 48 and 80, the inserts 38 and 66 and the back blocks 40 and 68 are replaced, and the frame-shaped main molds 42 and 70 are not replaced. Can be used. The frame-shaped main molds 42 and 70 can be commonly used for molding various products. Further, since it is only necessary to form the minimum necessary holes in the back blocks 40 and 68, there is no insufficiency in strength. Different types of products can be suitably molded.

  In the above-described embodiment, the configuration in which the back side blocks 40 and 68, which are block-like members, are arranged on the back side of the inserts 38 and 66 as the inner main mold is different. , 66 may be configured such that a back side plate, which is a plate-like member, is disposed as an inner main mold on the back side.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

DESCRIPTION OF SYMBOLS 10 Molding machine 12 Fixed platen 14 Movable platen 16 Fixed die 18 Movable die 20 Clamping cylinder 22 Tie bar 24 Sleeve 26 Casting mechanism 28 Casting pin 30 Extrusion mechanism 32 Extrusion pin 34 Fixed die cooling system 36 Movable die cooling System 38 Insert 40 Back block 42 Frame-shaped main mold 44 Cooling water circulation path 46 Cooling water forward path 48 Cooling water return path 50 Cooling water supply path 52 Cooling water discharge path 54 Tightening bolt 56 Tightening bolt 58 Cast hole 60 Tightening bolt hole 62 Casting Drain hole 64 Clamping bolt hole 66 Insert 68 Back side block 70 Frame-shaped main mold 72 Clamping bolt 74 Clamping bolt 76 Cooling water circulation path 78 Cooling water return path 80 Cooling water return path 82 Cooling water supply path 84 Cooling water discharge path 86 Extrusion hole 88 Tightening Bolt hole 90 Extrusion hole 92 Tightening bolt hole

Claims (5)

A mold that can mold different types of products,
A nest with a cavity surface formed,
An inner main mold placed on the back side of the nesting,
It has a penetrating area, and has an outer main mold that accommodates the inner main mold in the penetrating area,
A mold characterized in that the insert and inner main mold can be exchanged according to the type of product to be molded.   2. The mold according to claim 1, wherein an extrusion hole through which the extrusion pin passes is formed in the inner main mold.   3. The mold according to claim 1, wherein a cast hole through which a cast pin penetrates is formed in the inner main mold.   The mold according to any one of claims 1 to 3, wherein a tightening bolt hole through which a tightening bolt for fixing the insert and the inner main mold passes is formed in the inner main mold.   The metal mold according to any one of claims 1 to 4, wherein a cooling water forward path and a cooling water return path for circulating cooling water through the nest are formed in the inner main mold.

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