JP6330375B2 - Aluminum alloy casting material production equipment - Google Patents

Description

  The present invention relates to an apparatus for producing an aluminum alloy casting material.

  Aluminum alloy to obtain a solidified material by pouring molten aluminum alloy into a straight barrel-shaped stainless steel container as a device for producing billets as casting materials by semi-molten casting (thixocasting or thixocasting) An apparatus for producing a casting material is known (see, for example, Patent Document 1).

JP 2010-155262 A

  In the above technique, the heat of the molten metal is transmitted to the stainless steel container at the time of pouring, but since this heat is hardly dissipated in the central part of the stainless steel container, the molten metal solidifies in a state where the central part is expanded more than the other parts. For this reason, there is a problem that it is difficult to remove the mold after the molten metal is solidified and the productivity of the aluminum alloy casting material is inferior.

  The problem to be solved by the present invention is to provide an apparatus for producing an aluminum alloy casting material excellent in productivity.

  The present invention solves the above-mentioned problem by the inner diameter of the cylindrical portion of the mold before pouring being larger toward the opening on the bottom side of the mold than the straight barrel portion of the cylindrical portion. To do.

  According to the present invention, since the inner diameter of the cylindrical portion of the mold is increased toward the opening on the bottom side of the mold, the expansion at the substantially central portion of the mold during the solidification process of the molten metal can be mitigated. . For this reason, it is easy to remove the mold even when the temperature is lowered, and the time from pouring to removing the mold can be shortened, so that the productivity of the aluminum alloy casting material is improved.

FIG. 1 is a sectional view showing an apparatus for producing an aluminum alloy casting material according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a modification of the mold provided in the aluminum alloy casting material manufacturing apparatus according to the embodiment of the present invention. FIG. 3A is a cross-sectional view showing the time of manufacturing an aluminum alloy casting material. FIG. 3B is a cross-sectional view showing the time of manufacturing the aluminum alloy casting material. 4 (A) and 4 (B) are diagrams showing the time of casting by the semi-molten casting method, and FIG. 4 (A) is a diagram in the case of using an aluminum alloy casting material manufactured by a conventional apparatus. FIG. 4B is a view when an aluminum alloy casting material manufactured by the manufacturing apparatus of the present invention is used. It is sectional drawing which shows the casting_mold | template which concerns on the comparative example of the casting_mold | template concerning embodiment of this invention shown in FIG. It is a graph which shows the external shape with respect to the height direction of the billet cast using the casting_mold | template which concerns on the comparative example shown to FIG. 5A.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an apparatus for producing an aluminum alloy casting material in the present embodiment, and FIG. 2 is a sectional view showing a modification of a mold provided in the apparatus for producing an aluminum alloy casting material in the present embodiment.

  An apparatus 1 for producing an aluminum alloy casting material in the present embodiment is an apparatus for producing an aluminum alloy casting material (hereinafter also referred to as billet) for a semi-molten casting method (so-called thixocasting method). The semi-molten casting method is a method in which a billet is heated to a predetermined temperature so that a solid phase and a liquid phase coexist (a semi-molten state), and in that state, the billet is extruded into a mold cavity and filled. This is a method of casting a product such as a part. In this semi-molten casting method, the fluidity of the semi-molten billet in the solid phase and the liquid phase is different from each other, so in order to properly fill the cavity, it is better to use a homogeneous billet. It is important in manufacturing products. As shown in FIG. 1, a manufacturing apparatus 1 for an aluminum alloy casting material in the present embodiment includes a mold 10 having a cylindrical cylindrical portion 2 and a bottom portion 3 provided below the cylindrical portion 2 in the drawing. I have.

Cylindrical portion 2 of the mold 10 is composed of a material such as stainless steel, as shown in FIG. 1, closed and straight body part 21 of cylindrical shape having a substantially constant inner diameter D _1, and the enlarged diameter portion 22, a These are integrally formed. In addition, after forming the straight body part 21 and the enlarged diameter part 22 each independently, you may comprise the cylinder part 2 by joining them.

The straight body portion 21 has a predetermined thickness W ₁ and has a cylindrical shape having an opening 211 having an inner diameter D ₁ . As shown in FIG. 1, the straight body portion 21 in the present embodiment has a substantially constant thickness along the height direction (vertical direction in the figure), but the inner wall of the straight body portion 21 is It may be a straight body shape and is not particularly limited thereto.

As shown in FIG. 1, the enlarged diameter portion 22 is formed below the straight body portion 21 and has a truncated cone shape in which the inner diameter gradually increases from the lower end of the straight body portion 21 toward the bottom portion 3. ing. Therefore, the lower end of the enlarged diameter portion 22 (i.e., the lower end of the cylindrical portion 2) the inner diameter _{D 2} of the opening 221 of is larger than the inner diameter _{D 1} of the cylindrical body portion 21 _{(D 2> D} 1). The diameter expansion amount E in the diameter-enlarged portion 22 is a diameter at a substantially central portion in the height direction of the cylindrical portion 2 due to heat when the molten aluminum alloy is poured into the mold 10 from the viewpoint of improving the moldability of the billet. It is preferable that the amount of expansion in the direction is larger.

  The enlarged diameter portion 22 in the present embodiment has a gradually increasing inner diameter by inclining linearly from the lower end of the straight body portion 21 toward the bottom portion 3, but is not particularly limited thereto. For example, although not particularly illustrated, a cylindrical shape (such as a trumpet shape) that curves outward or inward from the lower end of the straight body portion 21 toward the bottom portion 3 and expands toward the end may be used.

The thickness of the enlarged diameter portion 22 of the present embodiment has a thickness W ₁ is equal to the straight body section 21 is not particularly limited thereto. For example, as the cylindrical portion 2B shown in FIG. 2, the outer diameter of the enlarged diameter portion 22B is substantially constant diameter _{D 3,} the lower end of the enlarged diameter portion 22B (thickness _{W 1)} from the cylindrical body portion 21B ( The thickness may gradually increase toward the thickness W ₂ ).

  In the present embodiment, the inner wall of the enlarged diameter portion 22 and the inner wall of the straight barrel portion 21 have a smoothly continuous shape at the boundary 23 between the enlarged diameter portion 22 and the straight barrel portion 21. The position at which the boundary 23 is formed is not particularly limited, but it is preferable that the boundary 23 is located in an area of 20% to 60% in the overall height of the cylindrical portion 2 from the bottom 3 from the viewpoint of improving the moldability of the billet. .

  The bottom part 3 is a disk shape having a larger diameter or the same diameter as the lower end of the cylindrical part 2 (lower end of the inclined part), and is formed of the same material as the cylindrical part 2. The bottom 3 is provided below the cylinder 2 and closes the opening 221. The shape of the cavity 4 of the mold 10 formed by the cylindrical portion 2 and the bottom portion 3 corresponds to the size of the billet to be manufactured by the aluminum alloy casting material manufacturing apparatus 1, and as will be described later, the melting is not shown. The molten aluminum alloy 5 melted in a furnace or the like is poured into the cavity 4.

  When manufacturing a billet using the manufacturing apparatus 1 for an aluminum alloy casting material in the present embodiment, as shown in FIG. 3A, first, for example, AC4C (Al—Si—Mg system) melted in a melting furnace (not shown). The molten alloy 5 corresponding to the alloy) is poured into the cavity 4 of the mold 10 with a release material (not shown) applied to the inner wall by a predetermined amount using a casting ladle or the like. At this time, the liquid level of the poured molten metal is higher than the boundary 23, and the molten metal 5 is set to a predetermined amount that does not overflow from the upper opening 211 of the cylindrical portion 2.

  Next, the molten metal 5 is solidified by standing and cooling in a state where the mold 10 is held horizontally. Then, while the temperature of the molten metal 5 varies in the height direction of the mold 10, that is, before the molten metal 5 is sufficiently cooled, the cylinder portion 2 and the bottom portion 3 are relatively separated from each other to remove the mold ( The target billet 51 can be obtained. When removing the mold, the cylindrical portion 2 may be raised while the bottom portion 3 is fixed, or the bottom portion 3 may be lowered while the cylindrical portion 2 is fixed. Further, the bottom portion 3 may be lowered and the cylindrical portion 2 may be raised.

  Next, the effect of the aluminum alloy casting material manufacturing apparatus 1 according to this embodiment will be described. 4 (A) and 4 (B) are diagrams for explaining the effect of the aluminum alloy cast material manufacturing apparatus 1 according to the present embodiment.

  The mold 10 of the aluminum alloy casting material production apparatus 1 is usually made of a material (such as stainless steel) that is superior in thermal conductivity to the atmosphere (air). For this reason, the temperature of the molten aluminum alloy poured into the mold 10 is most unlikely to decrease at a substantially central portion in the height direction of the mold 10. For this reason, conventionally, when the molten metal poured into the aluminum alloy casting material manufacturing apparatus solidifies, the mold 10 has a shape that is expanded at a substantially central portion in the height direction. As a result, the solidified aluminum alloy casting material (billet) solidifies in a drum shape, so that it could not be easily removed. This becomes more noticeable when manufacturing a large billet.

  FIG. 5A is a cross-sectional view showing a mold 10 according to a comparative example in which the enlarged diameter portion 22 is omitted from the mold 10 of the present example shown in FIG. 1, and various dimensions other than that the enlarged diameter portion 22 is not provided. The material is the same as that of the mold 10 of this example shown in FIG. FIG. 5B is a graph obtained by measuring an outer diameter dimension (the number of billet samples = 3) of a billet cast using the mold 10 according to this comparative example. As shown in FIG. 5B, it is understood that the outer diameter dimension in the range of 20% to 60% from the bottom 3 is the largest.

In contrast, in the mold 10 provided in the aluminum alloy casting material manufacturing apparatus 1 according to the present embodiment, the diameter-enlarged portion 22 is formed on the bottom 3 side of the straight body portion 21. Thus, the diameter _{D 2} of the lower opening 221 of the cylindrical portion 2 is larger than the inner diameter _{D 1} at the boundary 23.

  For this reason, the expansion in the substantially central portion of the cylindrical portion 2 caused by the heat of the molten metal 5 poured into the cavity 4 is alleviated, and the mold can be easily removed even before the temperature of the molten metal 5 is equalized by heat radiation. . That is, since the time from pouring to mold removal can be shortened, the productivity of the billet 51 can be improved. Along with this, it is also possible to suppress the amount of the release material used at the time of manufacture. These effects are further improved when the boundary 23 is located in the region of 20% to 60% in the overall height of the cylindrical portion 2 from the bottom portion 3.

In the example shown in FIG. 2, the presence of the enlarged diameter portion 22B, it is possible to achieve the same effect as described above, the thickness W ₂ of the cylindrical body portion 21B is larger than the thickness of the enlarged diameter portion 22B As a result, the heat dissipation of the molten metal 5 is improved in the straight body portion 21. For this reason, the expansion in the substantially central portion of the cylindrical portion 2 due to the heat of the molten metal 5 is suppressed, and the die-cutting becomes easier, so that the productivity of the billet is further improved.

  Moreover, when a billet is manufactured using the casting_mold | template from which the cylinder part is comprised only from the enlarged diameter part, the shape of the whole billet becomes frustum shape. For this reason, when the billet 51B is set in the filling sleeve 6 of the casting apparatus when the cast is manufactured using the billet, as shown in FIG. 4A, the billet is formed in the vicinity of the plunger tip 7 of the extrusion cylinder. The gap 71 is increased, and accordingly, the amount of billet that can be extruded at one time in the casting manufacturing process is reduced. In addition, the arrow in FIG. 4 (A) and FIG. 4 (B) shows the extrusion direction of a billet.

  In this respect, the billet 51 manufactured by the aluminum alloy casting material manufacturing apparatus 1 in the present embodiment has a substantially constant diameter at a portion corresponding to the straight body portion 21 of the manufacturing apparatus 1. For this reason, as shown in FIG. 4 (B), the gap 71 formed in the vicinity of the plunger tip 7 of the extrusion cylinder is reduced to reduce the amount of billets that can be extruded at one time in the casting manufacturing process. It can be minimized and the productivity of the casting can be improved.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus of aluminum alloy casting material 10 ... Mold 2, 2B ... Tube part 21, 21B ... Straight trunk | drum 211 ... Opening 22, 22B ... Diameter-expanding part 221 ... Opening 23 ... boundary 3 ... bottom 4 ... cavity 5 ... molten metal 51 ... billet (aluminum alloy casting material)
6 ... Sleeve for filling 7 ... Plunger tip 71 ... Air gap

Claims (2)

An apparatus for producing an aluminum alloy casting material using a mold comprising: a cylindrical portion extending in the vertical direction; and a bottom portion that closes the lower opening of the cylindrical portion,
The cylindrical portion is
Formed on the upper side of the cylindrical portion, a straight body portion of a predetermined inner diameter;
An apparatus for producing an aluminum alloy casting material, comprising: an enlarged diameter portion formed on the lower side of the straight body portion and having an inner diameter increased from the straight body portion toward the lower opening. An apparatus for producing an aluminum alloy casting material according to claim 1,
An apparatus for producing an aluminum alloy casting material, wherein a boundary between the straight body part and the enlarged diameter part is located in a region of 20% or more and less than 60% in the total height of the cylindrical part from the bottom part.

Images