JP2005081377A - Casting method and cast parts - Google Patents

Abstract

An object of the present invention is to provide a casting method capable of improving the adhesion between a part of a primary molded part molded by press working or the like when casting a secondary molded part by casting.
A square member as a secondary molded product is cast by a caster that pours molten metal into a cavity 22 of a molding die 20 into which one end of a molded cylindrical member 10 is inserted as a primary molded part. When the square member is integrated with one end of the cylindrical member 10, a part of the cylindrical member 10 is placed at a location where the molten metal poured into the cavity 22 of the mold 20 is solidified most slowly. It is characterized by being inserted in the vicinity.
[Selection] Figure 1

Description

  The present invention relates to a casting method and a cast part, and more specifically, a secondary molded product is cast by a caster that pours molten metal into a cavity of a molding die into which a part of the molded primary molded part is inserted. The present invention relates to a casting method and a cast part in which a secondary molded product is integrated with a part of the primary molded part.

The rectangular part shown in FIG. 4 is integrated with a corner member 12 as a secondary molded part in which each end portion of the cylindrical member 10 as four primary molded parts forms a corner of the rectangular part. It has become.
Conventionally, the integration of one end of the cylindrical member 10 and the corner member 12 is performed by, for example, driving the end portion of the cylindrical member 10 into a hole formed by drilling the previously formed corner member 12 with a drill or the like. I was going. However, operations such as drilling are cumbersome and work efficiency is poor.
For this reason, there is a case where the cylindrical member 10 is inserted into a cavity of a molding die for casting the square member 12 into which one end portion of the tubular member 10 is inserted, and the molten metal is poured into the casting mold (for casting casting, the following patent is used). Reference 1).
JP-A-11-222152 ([0007] to [0012], FIGS. 1 to 3)

By casting the square member 12 as the secondary molded part by casting at each end of the cylindrical member 10 as the four primary molded parts formed by press working or the like, four cylindrical shapes are formed. Each end portion of the member 10 and the corner member 12 can be easily integrated, and a rectangular part shown in FIG. 4 can be obtained.
However, the end of the cylindrical member 10 formed by press working or the like and the square member 12 obtained by casting are liable to deteriorate in adhesion, and the finally obtained rectangular part has a mechanical strength such as strength. It has been found that characteristics are likely to be problematic.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a casting method and a casting part that can improve the adhesion between the parts of the primary molded part molded by press working or the like when casting the secondary molded part by casting. Is to provide.

As a result of studying the above problems, the present inventors have improved the flowability of the molten metal with respect to a part of the surface of the primary molded part inserted into the cavity of the primary mold, thereby performing the primary molding. It has been found that the adhesion between a part of the part and the secondary molded part can be improved, and the present invention has been achieved.
That is, according to the present invention, a secondary molded product is cast by a caster that pours molten metal into a cavity of a molding die into which a part of the molded primary molded component is inserted. When the secondary molded product is integrated with the part, a part of the primary molded part is inserted in the vicinity of the place where the molten metal poured into the mold cavity is solidified most slowly. The casting method is characterized by the following.
The present invention also provides a method for casting a secondary molded product by a caster that pours molten metal into a cavity of a molding die into which a part of the molded primary molded component is inserted. A cast part obtained by integrating a secondary molded product into a part, wherein the cast part is the slowest part of the primary molded part, and the molten metal poured into the mold cavity is the latest. The cast part is formed by being inserted and integrated in the vicinity of a portion to be solidified.

In the present invention, a gravity casting mold in which a gate to which molten metal is poured is opened at the ceiling of the cavity is used as the mold, and a part of the primary molded part is inserted in the vicinity of the gate. Thus, a part of the primary molded part can be positioned in the vicinity of the place where the molten metal poured into the cavity solidifies most slowly.
In particular, the use of a mold provided with a heater in the vicinity of the inner wall surface of the cavity in the vicinity of which a part of the primary molded part has been inserted as the mold makes it possible to solidify the molten metal at any location of the cavity. A place to be delayed can be formed.

Further, by forming a hook-like portion at the tip of the first molded part inserted into the cavity of the mold, the adhesion between a part of the primary molded part and the secondary molded part can be further improved.
Forming a thin cylindrical part thinner than the thickness of the bowl-shaped part on the cavity inner side end face of the bowl-shaped part, so that the thin cylindrical part is in contact with the molten metal immediately after pouring into the cavity, By adjusting the position of the tip of the first molded part, the thin cylindrical part is partially melted by the molten metal poured into the cavity, and the adhesion between a part of the primary molded part and the secondary molded part Can be further improved.
In addition, the molten metal is poured by pouring the molten metal in the cavity of the mold into which a part of the primary molded part is inserted in the presence of a reducing compound that reduces the oxide film formed on the surface of the molten metal. The revolving property can be remarkably improved, and the flowability of the molten metal to the surface of a part of the primary molded part inserted into the mold cavity can be improved.

By using a primary molded part made of aluminum or an alloy thereof as the primary molded part, using a molten metal made of aluminum or an alloy thereof as a molten metal, and using Mg ₃ N ₂ as a reducing compound The flowability of the molten metal to the surface of a part of the primary molded part inserted into the mold cavity can be significantly improved. The oxide film formed on the surface of a part of the primary molded part inserted into the cavity of the mold and the oxide film formed on the surface of the molten metal can be removed. This is because the wettability of the molten metal with respect to a part of the surface can be improved.
It should be noted that a tubular member is used as the primary molded part, and the opening end is formed so that the molten metal can be prevented from entering the inside of the tubular member from the opening in the cavity of the tubular member through the inner hole. By closing the inner hole in the vicinity with the closing member, it is possible to reduce the weight of the final product composed of the primary molded part and the secondary molded part.

  In the present invention, a part of the primary molded part is inserted in the vicinity of the location where the molten metal poured into the mold cavity is solidified most slowly. For this reason, a part of the primary molded part inserted into the cavity of the mold has a long surface and a molten metal part in which the liquid phase state is maintained for a long time among the molten metal filled in the cavity. It can contact and can fully contact | adhere with the secondary molded part formed with the molten metal with which the cavity was filled. As a result, it is possible to obtain a final product composed of a primary molded part and a secondary molded product having excellent mechanical properties such as strength.

In the present invention, for example, one end of a cylindrical member 10 made of aluminum or an alloy thereof as a primary molded part constituting the rectangular part shown in FIG. 4 and a secondary part forming a corner part of the rectangular part. A mold for casting the square member 12 at one end of the cylindrical member 10 formed by cutting, extruding, pressing or the like when integrating the square member 12 made of aluminum or an alloy thereof as a molded part. It inserts in the cavity of this, and it carries out by the cast fill which pours the molten metal which consists of aluminum or its alloy in this cavity.
In such cast-in, the one end of the cylindrical member 10 is inserted in the vicinity of the location where the molten metal poured into the cavity of the mold for casting the square member 12 is solidified most slowly. In this way, by inserting one end of the cylindrical member 10 in the vicinity of the location where the molten metal poured into the cavity is solidified most slowly, the surface of the one end of the cylindrical member 10 and the cavity are inserted. Among the filled molten metal, the molten metal part in which the liquid phase state is maintained for the longest can be brought into contact with each other for a long time, and the one end portion of the tubular member 10 and the corner member 12 can be brought into close contact with each other.

Here, as the location where the molten metal poured into the cavity of the mold for casting the corner member 12 is solidified latest, the gate 24 into which the molten metal is poured is the ceiling of the cavity 22 as shown in FIG. In the case of using the gravity casting mold 20 opened in the part, it is in the vicinity of the gate 24. This is because since the molten metal is poured into the cavity 22 from the gate 24, the molten metal in the vicinity of the gate 24 solidifies latest among the molten metal filled in the cavity 22.
Therefore, by inserting one end of the cylindrical member 10 in the vicinity of the gate 24 as shown in FIG. 1, the end of the cylindrical member 10 inserted into the cavity 22 has a cavity surface. Among the molten metal filled in 22, it can be in contact with the molten metal part that has been kept in the liquid phase for the longest time, and can be in close contact with the corner member 12 formed by the molten metal filled in the cavity 22.

In addition, as shown in FIG. 1, one end portion of the cylindrical member 10 and the square member 12 are concavo-convexly fitted by forming a collar portion 26 at one end portion of the cylindrical member 10 inserted into the cavity 22. In addition, the adhesion between the two can be further improved.
Furthermore, when molten metal is poured into the cavity 22 shown in FIG. 1, the opening from one end of the cylindrical member 10 inserted into the cavity 22 passes through the inner hole 10 a to the inside of the cylindrical member 10. In order to prevent the molten metal from entering, the inner hole 10 a in the vicinity of the opening end is closed by the closing member 28. It is possible to prevent the tubular member 10 from being blocked by the molten metal, and to reduce the weight of the final product including the tubular member 10 and the corner member 12.

As shown in FIG. 1, even if one end of the cylindrical member 10 is inserted in the vicinity of the gate 24 as shown in FIG. 1, the surface of the one end of the cylindrical member 10 and the molten metal portion in the liquid phase state. 2, the heaters 30, 30 are provided near the inner wall surface of the cavity 22 located in the vicinity of the gate 24 as shown in FIG. The cooling of the molten metal can be further delayed.
Further, when it is difficult to insert one end of the cylindrical member 10 in the vicinity of the gate 24, by providing the heaters 30 and 30 near the inner wall surface of the cavity where the one end of the cylindrical member 10 is easily inserted, Cooling of the molten metal filled in the vicinity of the place where one end of the cylindrical member 10 is inserted can be sufficiently delayed.
Thus, by providing the heaters 30 and 30 in the vicinity of the inner wall surface of the arbitrary portion of the cavity, the portion where the solidification of the molten metal filled in the arbitrary portion of the cavity 22 becomes the slowest can be formed.

  1 and 2 is provided at a position where it does not directly contact the molten metal poured from the gate 24. The flange 26 is formed at one end of the cylindrical member 10 shown in FIGS. As shown in FIG. 3, a thin cylindrical portion 32 that is thinner than the thickness of the flange-shaped portion 26 is formed on the end surface on the cavity inner side of the flange-shaped portion 26. The thin cylindrical portion 32 is positioned below the gate 24 so that at least a part of the thin cylindrical portion 32 comes into contact with the molten metal immediately after pouring from the gate 24 into the cavity 22. Therefore, the thin cylindrical portion 32 comes into contact with the high-temperature molten metal immediately after being poured into the cavity 22, a part of the thin cylindrical portion 32 is melted, and the one end portion of the cylindrical member 10 and the corner member 12 are Adhesion can be further improved.

Moreover, the reducing compound which reduces the oxide film formed in the surface of a molten metal exists in the cavity 22 of the shaping | molding die 20 which inserted the one end part of the cylindrical member 10 shown in FIGS. By pouring, the meltability of the molten metal can be remarkably improved, and the flowability of the molten metal to the surface of one end of the cylindrical member 10 inserted into the cavity 22 of the mold 20 can also be improved.
As such a reducing compound, Mg ₃ N ₂ can be suitably used. One end of the cylindrical member 10 made of aluminum or an alloy thereof is poured by pouring the reducing compound Mg ₃ N ₂ in the cavity 22 of the mold 20 into which one end of the cylindrical member 10 is inserted. The oxide film formed on the surface of the part and the surface of the molten metal made of aluminum or an alloy thereof can be removed, and the meltability of the molten metal and the wettability of the molten metal to the surface of one end of the cylindrical member 10 can be improved. For this reason, the flowability of the molten metal with respect to the surface of the one end part of the cylindrical member 10 inserted in the cavity 22 of the shaping | molding die 20 can be improved significantly, and the one end part of the cylindrical member 10 and the square member 12 can fully contact | adhere. .
In order to make Mg ₃ N ₂ which is a reducing compound exist in the cavity 22 of the mold 20 into which one end of the cylindrical member 10 is inserted, for example, a method described in Japanese Patent Application Laid-Open No. 2001-333567. Can be adopted.

  The rectangular part shown in FIG. 4 is obtained by inserting one end of each of the four cylindrical members 10 into the cavity 22 of the mold 20 for casting the square member 12 and filling the cavity 22 with molten metal. be able to. The corner members 12 that form the four corners of the rectangular part may be cast simultaneously or separately.

It is sectional drawing explaining an example of the casting method which concerns on this invention. It is sectional drawing explaining the other example of the casting method which concerns on this invention. It is sectional drawing explaining the other example of the casting method which concerns on this invention. FIG. 5 is a partial cross-sectional plan view of a rectangular component in which each end portion of a cylindrical member as a primary molded component is integrated with a square member as a secondary molded component that forms a corner of the rectangular component. .

Explanation of symbols

10 Cylindrical member (first molded part)
10a Inner hole 12 Square member (second molded part)
DESCRIPTION OF SYMBOLS 20 Mold 22 Cavity 24 Gate 26 Gutter-shaped part 28 Filling member 30 Heater 32 Thin cylindrical part

Claims (9)

A secondary molded product is cast by a caster that pours molten metal into a cavity of a molding die into which a part of the molded primary molded part is inserted, and secondary molding is performed on a part of the primary molded part. When integrating products,
A casting method, wherein a part of the primary molded part is inserted in the vicinity of a portion where the molten metal poured into the cavity of the mold is solidified most slowly.   The molding die for gravity casting in which a gate into which molten metal is poured is opened in a ceiling portion of a cavity is used, and a part of a primary molded part is inserted in the vicinity of the gate. Casting method.   The casting method according to claim 1 or 2, wherein a molding die provided with a heater in the vicinity of the inner wall surface of the cavity in the vicinity of which a part of the primary molded part is inserted is used as the molding die.   The casting method according to any one of claims 1 to 3, wherein a bowl-shaped portion is formed at a tip portion of the first molded part inserted into the cavity of the molding die.   A thin cylindrical part thinner than the thickness of the hook-shaped part is formed on the cavity inner side end surface of the hook-shaped part formed at the tip of the first molded part inserted into the cavity of the molding die, and the thin cylindrical shape The casting method according to any one of claims 1 to 3, wherein the position of the tip of the first molded part is adjusted so that the portion comes into contact with the molten metal immediately after pouring into the cavity.   The molten metal is poured in the presence of a reducing compound that reduces the oxide film formed on the surface of the molten metal in the cavity of the mold in which a part of the primary molded part is inserted. The casting method according to one item. The primary molded part made of aluminum or an alloy thereof is used as the primary molded part, the molten metal made of aluminum or an alloy thereof is used as the molten metal, and Mg ₃ N ₂ is used as the reducing compound. The casting method described.   As the primary molded part, a cylindrical member is used, so that the molten metal can be prevented from entering the inside of the cylindrical member through the inner hole from the opening in the cavity of the cylindrical member. The casting method according to claim 1, wherein the inner hole is closed by a closing member. A secondary molded product is cast by a caster that pours molten metal into a cavity of a molding die into which a part of the molded primary molded part is inserted, and secondary molding is performed on a part of the primary molded part. Cast parts obtained by integrating products,
The cast part is integrally formed by inserting a part of the primary molded part in the vicinity of a portion where the molten metal poured into the cavity of the mold is solidified most slowly. Casting parts to do.

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