JP3780327B2 - Silicon mold for vacuum casting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a silicon mold for vacuum casting suitable for molding vacuum casting parts used in various industrial products and the like.
[0002]
[Prior art]
As this type of silicon mold for vacuum casting, a silicon mold as shown in FIG. 6 is conventionally used. In the silicon mold 100 of this example, a pair of molds 101 and 102 that can be split are joined at the joint 103, and a cavity 104 is formed inside as shown in FIG. A molding material is injected from the material injection port 105 into the cavity 104.
[0003]
As shown in FIG. 8, an injection tube 106 is inserted into the material injection port 105, and a molding material is injected through the injection tube 106. When the mold is set, the molding dies 101 and 102 are joined at the joint portion 103. In this case, the mold is clamped using, for example, a rubber belt or a tape.
[0004]
[Problems to be solved by the invention]
When the mold is set, ideally, the pair of molding dies 101 and 102 should be closely joined without any positional deviation as shown in FIG. However, in the conventional silicon mold 100, since the two molds 101 and 102 are simply combined, it is difficult to ensure high sealing performance as it is.
[0005]
Further, as shown in FIG. 9B, when a deviation occurs between the molds 101 and 102, there is a possibility that air is mixed from a gap generated in the joint portion 103. Such mixed air significantly affects the quality of the product that is a vacuum casting. Furthermore, since a separate injection tube 106 is used at the material injection port 105, there is a possibility that air may enter from a gap generated at the joint portion with the molds 101 and 102 as shown in FIG. 10.
[0006]
Furthermore, since the mold is clamped each time using a rubber belt or the like when the mold is set, the tightening condition is not always stable, and the work takes considerable time.
[0007]
In the simple vacuum casting machine described in Japanese Utility Model Laid-Open No. 7-31324, the main mold portion and the sub mold portion are each provided with a mold matching protrusion and a concave portion to be fitted thereto. However, this vacuum casting machine has a fitting structure using a large number of small protrusions, and there is no guarantee that high sealing performance is ensured.
[0008]
An object of this invention is to provide the silicon mold | die for vacuum casting which can aim at the quality improvement of a vacuum casting component, etc. very effectively with a simple structure in view of the above point.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present invention is to join the split can be a pair of molds at the junction, in the vacuum casting silicon type which is adapted to inject molding material into the cavity, one of the mold A seal wall body projects from the joint portion, an engagement groove is formed in the joint portion of the other mold corresponding to the seal wall body, and a plurality of small holes are formed in the seal wall body. The engaging groove is formed with a boss that fits into the small hole.
[0010]
Also, in the vacuum casting silicon type according to the present invention, preferably, the is the material inlet is provided for injecting molding material into the cavity, the material inlet formed in the mold body and integrally This is preferable.
The material inlet is preferably formed integrally with each mold.
[0011]
According to the present invention, by having the seal guide having the concave and convex engagement structure at the joint portion of the pair of molds, it is possible to perform mold matching smoothly and accurately at the time of mold setting. Thus, a high sealing performance can be ensured by joining the two molds closely together without positional deviation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a silicon mold for vacuum casting according to the present invention will be described below with reference to FIGS.
FIG. 1 shows an example of a silicon mold for vacuum casting in this embodiment. The silicon mold 10 is formed by joining a pair of molds 11 and 12 that can be split at a joint 13 to form a cavity 14 as shown. A molding material is injected into the cavity 14 from the material injection port 15.
[0013]
In this embodiment, the joint portion 13 is provided with a seal guide having an uneven engagement structure. As shown in FIG. 2, the seal guide has a seal wall 16 projecting from the joint 13 of one mold 11 and a joint 13 of the other mold 12 corresponding to the seal wall 16. And an engagement groove 17 formed.
[0014]
As shown in FIG. 2, the seal wall body 16 is formed in a rectangular frame shape, and a corresponding portion of the material inlet 15 is cut out. Moreover, it has the retaining part 16a formed by appropriately bending the side embedded in the mold 11. The seal wall 16 can be integrated with the mold 11 by insert molding. The engagement groove 17 has a depth sufficient to receive the seal wall body 16 protruding from the joint portion 13 of the mold 11.
[0015]
Further, in the vacuum casting silicon mold 10 of the present invention, a plurality of small holes 16b are formed in the seal wall body 16, and the engaging grooves 17 are formed with bosses 18 that fit into the small holes 16b. . As shown in FIG. 3 or FIG. 4, the boss 18 is preferably provided on the outside (surface) of the engagement groove 17.
[0016]
The material inlet 15 is integrally formed with the silicon mold 10. That is, in this example, as shown in FIG. 2, the half portions 15a and 15b of the material injection port 15 are integrally formed by the forming dies 11 and 12, respectively.
[0017]
In the above configuration, when the mold is set, the pair of molds 11 and 12 are matched. In this case, the seal wall body 16 is inserted into the engagement groove 17. At this time, as shown in FIG. 4, the outer portion of the mold 12 may be expanded outward from the engagement groove 17. Then, after the seal wall body 16 is inserted, the expanded outer portion is returned to the original state, whereby each boss 18 is fitted into the small hole 16 b of the seal wall body 16. Moreover, the material injection port 15 is also formed by this mold matching.
[0018]
After mold setting, a vacuum casting component is molded by injecting a molding material into the cavity 14 from the material inlet 15. At the time of injection of the molding material, the material injection port 15 is integrally formed with the silicon mold 10, so that there is no fear of air entering from a gap or the like. After molding, the mold is split and the vacuum cast part is taken out from the cavity 14.
[0019]
By having the seal guide in this way, the two molds 11 and 12 can be joined tightly without misalignment, and high sealing performance can be ensured. Further, by positioning and guiding the molds 11 and 12 with the seal guide, no matter who performs the work, the mold alignment work can be performed very smoothly simultaneously with accurate positioning. By ensuring high mold alignment accuracy and sealing performance, the quality of the vacuum cast parts can be greatly improved, and the quality can be stably maintained.
[0020]
In addition, the number of the small holes 16b or the bosses 18 provided in the seal wall body 16 and the engagement groove 17 in the above embodiment can be appropriately changed as necessary.
[0021]
【The invention's effect】
As described above, according to the present invention, the quality of this type of vacuum casting component can be improved, and the molding operation can be stably and smoothly performed efficiently. Yes.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a silicon mold for vacuum casting in an embodiment of the present invention.
FIG. 2 is a perspective view showing a state when a silicon mold for vacuum casting is split in an embodiment of the present invention.
FIG. 3 is a perspective view showing a main configuration of a seal guide in the embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a cross-sectional view taken along the line BB in FIG.
FIG. 6 is a view showing an example of a conventional silicon mold for vacuum casting.
FIG. 7 is a diagram showing a configuration example of a conventional silicon mold for vacuum casting.
FIG. 8 is a perspective view showing a state in which a conventional silicon mold for vacuum casting is split.
9 is a cross-sectional view taken along the line CC of FIG.
10 is a cross-sectional view taken along the line DD of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Silicon mold | die 11,12 Mold 13 Joint part 14 Cavity 15 Material injection | pouring port 15a, 15b Half-divided part 16 Seal wall body 16a Retaining prevention part 16b Small hole 17 Engaging groove 18 Boss

Claims (3)

It is a silicon mold for vacuum casting in which a pair of molds that can be split are joined at the joint, and a molding material is injected into the cavity,
A seal wall projecting from the joint of one mold, and an engagement groove formed in the joint of the other mold corresponding to the seal wall,
The seal wall body with a plurality of small holes are drilled, the engagement vacuum casting silicon type characterized that you have been formed boss that fits into the small hole in the groove. 2. The silicon mold for vacuum casting according to claim 1, further comprising a material injection port for injecting a molding material into the cavity, wherein the material injection port is formed integrally with the mold body. 3. The silicon mold for vacuum casting according to claim 2 , wherein the material inlet is formed integrally with each mold.

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