JPH09220659A - Casting metallic mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the boring work at a post stage and also, to attain efficient cool even in the case of being a complicate shape. SOLUTION: A metallic mold 10 is formed by integrally inserting a pipe 14 with a metallic mold material 16 as cast-in in the condition of facing a cooling part 14a of the pipe 14 bending-formed as U-shape to the inner part approaching the mold surface 12 in the metallic mold 10. This pipe 14 is integrally inserted as cast-in at the time of casting the metallic mold 10. Further, the opening end parts of an inlet part 14b and an outlet part 14c communicated with the cooling part 14a of the pipe 14 are extended to the back surface side of the metallic mold 10 at both parts and opened to the outer part of the metallic mold and the through-hole of the pipe 14 is constituted so as to function as the cooling hole for coolant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal mold manufactured by casting, and more specifically, a metal mold for casting and injection molding in which a cooling hole for a cooling medium is formed by surrounding a pipe. It is about the type.

[0002]

2. Description of the Related Art Conventionally, a die used for casting or injection molding is completed by preforming a die material by forging or casting, and then finishing the shape portion by machining or manual work as required. ing. In the die, when casting a casting by a low pressure casting method, a gravity casting method, a pressure die casting method, or the like, or when molding a plastic or the like by injection molding, it is necessary to control the cooling of the die, and therefore air is used. BACKGROUND ART Cooling holes for circulating a cooling medium such as water and water have been formed.

For example, as shown in FIG. 10 (a), first, the mold 1
The first hole 40
10B, the second hole 42 and the third hole 44, which are orthogonal to the first hole 40, are drilled from the rear surface side to form the first hole 40 in the first hole 40, as shown in FIG. 10B. Communicate. Then
As shown in FIG. 10C, a portion of the first hole 40 that opens on the side surface is filled with a hole filling material 46 to close it, thereby forming a U-shaped cooling hole 48 that opens to the back side.

[0004]

In the mold 10 described above, the cooling hole 48 can be formed only by a straight line and a combination thereof, and in many cases, a process of closing a part of the hole once drilled is required. From the above, it is pointed out that the number of processing man-hours increases and the complicated labor is required. Further, in the conventional method of forming the cooling hole 48 by a straight line and a combination thereof, no R is attached to the corner portion of the cooling hole 48 where the direction changes, and the flow of the cooling medium is disturbed to prevent efficient cooling. Sometimes.

Further, due to the restriction of the mold surface 12 of the mold 10, it is often impossible to form the cooling holes 48 at appropriate portions that require cooling, and accurate cooling control cannot be performed. Further, it is difficult to form the cooling hole 48 that is extremely thin and long.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the above-mentioned conventional technique, and is proposed in order to solve the problems suitably, and it is possible to omit the punching work in the subsequent steps. At the same time, it is an object to provide a mold capable of achieving efficient cooling even with a complicated shape.

[0007]

[Means for solving the problems] To overcome the above-mentioned problems,
The mold according to the present invention in order to preferably achieve the intended purpose,
In the mold for molding the mold, in a state where the pipe is positioned at a site that requires cooling when the mold is used, by supplying and solidifying the molten mold material to the mold to perform mold molding, It is characterized in that the opening integrally surrounds the pipe communicating with the outside of the mold.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, regarding a mold according to the present invention,
Preferred embodiments will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a mold 10 according to the embodiment.
Is inside the mold 10 in the vicinity of the mold surface 12,
The pipe 14 is formed by integrally surrounding the pipe 14 with a mold material 16 while facing the cooling portion 14a of the pipe 14 that is bent in a U shape. The open ends of the inlet part 14b and the outlet part 14c, which are connected to the cooling part 14a of the pipe 14, both extend to the back side of the mold 10 (opposite to the mold surface 12) and open to the outside of the mold. And the pipe 1
The four through holes are configured to function as cooling holes for the cooling medium. Various specifications such as the diameter and the length of the pipe 14 are arbitrarily set depending on the size of the mold 10 and the shape of the mold surface 12. As the material of the pipe 14, for example, ferritic stainless steel is preferably used, but other metals that can withstand the high temperature when the mold material 16 is cast can be appropriately adopted. Further, when casting or the like is performed using the mold 10, since heating and cooling are repeated, the pipe 1
It is recommended that the coefficient of thermal expansion of the material used for 4 be similar to that of the mold material 16.

The die 10 is formed by integrally surrounding a pipe 14 when casting the die 10. For example, as shown in FIG. 2, the cooling unit 14a of the pipe 14 is provided inside the mold 18 for molding the mold 10.
The pipe 14 is supported by, for example, a skirting board 20 or a kettle 22 in a state of being arranged so as to face a portion of the mold 10 that requires cooling. Then, as shown in FIG. 3, by casting a die material 16 such as hot work tool steel or cast iron into the interior of the die frame 18, the die 1 in which the pipe 14 is integrally cast
0 is obtained.

By integrally surrounding the pipe 14 when casting the die 10, it is possible to omit the drilling process in a later step and reduce the number of working steps. Further, since it is easy to give R to the bent portion (corner portion) of the pipe 14, efficient cooling can be achieved by smoothly circulating the cooling medium. Furthermore, the pipe 14
As shown in FIG. 4, since it can be easily bent and formed in advance corresponding to the complicated contour shape of the mold surface 12 of the mold 10, the cooling portion 14 is provided at a place where cooling is required.
It is possible to properly position a and it is possible to perform accurate cooling control. Thereby, when casting or the like (resin injection molding as another example) is performed using the mold 10, proper cooling of the mold is achieved, product quality is improved, and efficient cooling is achieved. The manufacturing cycle can be shortened to improve the manufacturing capacity, and the mold life can be extended.

Here, in casting the die 10,
Since the molten mold material 16 may cause the pipe 14 to be melted and damaged, it is recommended to preliminarily increase the wall thickness of the portion of the pipe 14 where there is a possibility of melt damage in order to prevent this. For example, as shown in FIG. 5, a weld overlay 24 is formed by overlay welding on the outer surface of the pipe 14 where there is a risk of melting damage (the outer surface corresponding to the thick portion of the die material 16).
By forming the above, melting damage of the pipe 14 is prevented. As shown in FIG. 6, the same material as the die material 16 of the die 10 is cast around the outer surface of the pipe 14 in a required thickness in advance, and the coating material 26 prevents melting damage of the pipe 14. You can The covering material 26 does not have to have a uniform thickness, and as shown in FIG. 7, a portion where melting loss is likely to occur may be thickened and a portion where melting loss is unlikely to occur may be thinned. Further, another pipe may be fitted on the outside of the portion of the pipe 14 where there is a risk of melting damage. Further, in the built-up portion 24 and the covering material 26, as shown in FIGS.
It is recommended to increase the thickness of the die material 16 on the larger thickness side (back side).

When the pipe 14 is cast by the mold material 16, as shown in FIG. 8, by filling the inside of the pipe 14 with powder 28 of ceramics, metal or the like, the pipe 14 is temporarily damaged by melting. Even if it occurs, it is possible to prevent the molten metal from entering the inside of the pipe. Therefore, after the pipe 14 is cast, the cooling hole is secured by removing the powder 28 from the inside of the pipe 14. In addition,
When the powder 28 is filled inside the pipe 14, the heat capacity of the entire pipe is increased, so that an effect that melting loss is less likely to occur can be expected.

Further, the pipe 14 is molded with a mold material 16 while a cooling medium such as water or cold air is circulated inside the pipe 14.
As a result, it is possible to prevent melting damage of the pipe 14 by integrally casting. Further, as shown in FIG. 9, the cooling metal 3 is provided on the outside of the portion of the pipe 14 where melting loss is likely to occur.
Melting damage can also be prevented by arranging 0 through the stay 32.

By subjecting the outer surface of the pipe 14 integrally cast by the mold material 16 to shot blasting or plating treatment in advance, fusion of the pipe 14 and the mold material 16 is promoted and a reliable cooling effect is obtained. can get. Further, it is preferable to apply a plating treatment to the inner surface of the pipe 14 because a rust prevention effect can be obtained.

[0016]

As described above, according to the mold of the present invention, it is possible to form the cooling hole without performing the drilling process after the molding of the mold, which can reduce the number of steps and is complicated. You can save time. In addition, even if the mold has a complicated shape, it is possible to efficiently cool the mold by bending the pipe in advance so that the pipe can be bent, so the manufacturing cycle using the mold can be shortened. In addition, the life of the die can be extended and the quality of the casting can be improved by the chill effect during casting. Furthermore, since the bent portion can be rounded, an efficient cooling effect can be achieved by achieving a smooth flow of the cooling medium in the bent portion.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view of a mold according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a process of molding a mold according to an embodiment.

FIG. 3 is an explanatory diagram showing a process of molding the mold according to the embodiment.

FIG. 4 is an explanatory cross-sectional view showing a mold according to another embodiment in which a pipe bent and formed corresponding to the mold surface of the mold is cast around.

FIG. 5 is an explanatory cross-sectional view showing a mold according to another embodiment in which a pipe having an overlay welded outer surface is cast around.

FIG. 6 is an explanatory cross-sectional view showing a mold according to another embodiment in which a pipe whose outer surface is cast with a covering material is further cast.

FIG. 7 is an explanatory cross-sectional view showing a mold according to another embodiment in which a pipe in which the thickness of the covering material is changed is cast.

FIG. 8 is an explanatory diagram showing a state in which powder is filled in the pipe when the die according to the embodiment is molded.

FIG. 9 is an explanatory view showing a state in which a cooling die is arranged on the outside of the pipe when the die according to the embodiment is molded.

FIG. 10 is an explanatory diagram showing a process of forming cooling holes in a mold according to a conventional technique.

[Explanation of symbols]

 10 Mold 14 Pipe 16 Mold Material 18 Form 26 Coating Material 28 Powder 30 Cold Mold

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location B22D 17/22 B22D 17/22 RD Q 19/00 19/00 AG B29C 33/04 B29C 33 / 04 33/38 33/38 45/73 45/73

Claims (11)

[Claims] 1. A mold (18) for molding a mold (10),
Pipes at the parts that require cooling when using the mold (10)
Mold material melted in the mold (18) with the (14) positioned
A mold characterized by integrally casting a pipe (14) whose opening communicates with the outside of the mold by supplying and solidifying (16) to mold. 2. The mold according to claim 1, wherein hot tool steel or cast iron is used as the mold material (16). 3. The mold according to claim 1, wherein the pipe (14) is made of a metal material. 4. The mold according to claim 3, wherein the metal material is a ferrite-based material. 5. The wall thickness of said pipe (14) is
The method according to claim 1, wherein the temperature is changed in accordance with the surrounding conditions of casting.
The mold according to any one of to 4. 6. The mold according to claim 5, wherein the thickness of the pipe (14) is changed by forming a weld overlay (24) on the outer surface of the pipe (14). 7. The mold according to claim 5, wherein the wall thickness is changed by casting the coating material (26) around the outer surface of the pipe (14) in advance with a required thickness. 8. The mold according to claim 1, wherein the pipe (14) is filled with powder (28) and is cast. 9. The mold according to any one of claims 1 to 7, wherein a cooling medium is circulated inside the pipe (14) so as to be cast. 10. The mold according to any one of claims 1 to 9, wherein the inner and outer surfaces of the pipe (14) are subjected to surface treatment in advance so as to be cast. 11. The mold according to any one of claims 1 to 10, wherein a cooling die (30) is positioned outside the pipe (14) to be cast.