JP4391666B2 - Molding device for vehicle wheel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle wheel mold apparatus and is used when casting a vehicle wheel having a thin portion. Here, the thin part includes not only the product but also a part (gate or the like) removed after casting.
[0002]
[Prior art]
A conventional mold apparatus includes a required number of molds, and these molds are integrally formed from an inner wall surface constituting a cavity to an outer wall surface in contact with the atmosphere, and poured into the cavity through a gate. He was producing castings.
[0003]
[Problems to be solved by the invention]
However, since the conventional mold apparatus is integrated from the inner wall surface constituting the cavity to the outer wall surface in contact with the atmosphere, the heat of the cavity is easily dissipated into the atmosphere. In order to maintain the fluidity of hot water, the thickness has to be increased, and as a result, the yield of the product has to be deteriorated.
[0004]
An object of the present invention is to eliminate these disadvantages.
[0005]
[Means for Solving the Problems]
In order to achieve this object, in the mold apparatus for a vehicle wheel according to the present invention, in the mold apparatus for a vehicle wheel having a thin rim portion forming space and a thin side gate opening to the rim portion forming space, the rim is provided. Since part of the inner wall surface in the part forming space and part of the inner wall surface of the side gate are configured by one insert, the heat of the thin rim forming space and the thin side gate is difficult to conduct to the mold and is radiated to the atmosphere. It is difficult.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 is a cross-sectional view of an embodiment of a mold apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 (with the upper mold removed), and FIG. FIG. 3 is a cross-sectional view of an embodiment of a mold apparatus of a vehicle wheel offset toward the front rim flange side.
[0007]
In FIGS. 1 to 3, M is a mold apparatus for a vehicle wheel by low-pressure casting, and has a lower mold 20 and a horizontal mold on the base 10 (corresponding to “a mold for casting the outer surface of the rim portion” of the present invention). 30 and a horizontal insert A in the horizontal mold 30, an upper mold 50, and a first insert 51 and a second insert 52 in the upper mold 50 are installed to form a vehicle wheel-shaped casting space S. The casting space S is composed of a disk portion forming space 91, a spoke portion forming space 92, and a rim portion forming space 93 (corresponding to the “thin cavity” of the present invention) 93. Further, the vehicle wheel cast by the casting space S has a shape in which the disk portion and the spoke portion are offset to the front rim flange side, and are connected to the front side from the front bead seat portion B of the rim portion. Yes. The vehicle wheel includes the lower mold 20 on the front side of the disk surface and the spoke surface of the vehicle wheel, the horizontal mold 30 on the outer side of the rim portion of the wheel, and the upper mold 50 on the disk portion and the spoke portion. And the inner side of the rim portion.
[0008]
Reference numeral 21 denotes a center gate formed in the lower mold 20, which opens into the disk molding space 91, and 31 is a side gate formed from the horizontal mold 30 to the horizontal insert A, and the rim part molding Open to space 93. The horizontal insert A will be described in detail later.
[0009]
62 is a stalk connected to the center gate 21, and 63 and 63 are stalks connected to the side gate 31. These stalks 62 and 63 extend downward through the base 10 and enter the molten metal in a molten metal holding furnace (not shown). Then, hot water is poured mainly into the disk portion forming space 91 and the spoke portion forming space 92 via the stalk 62, and pressurized hot water is poured mainly into the rim portion forming space 93 and the spoke portion forming space 92 via the stalk 63.
[0010]
Next, the horizontal insert A will be described in detail. In FIGS. 1 and 2, reference numeral 33 denotes an insertion recess, which is formed in a curved shape along the inner wall surface 34 of the horizontal mold 30 and the mold mating surfaces 35, 35. The horizontal insert A is inserted and fixed in the insertion recess 33 of the horizontal mold 30.
[0011]
Reference numeral 81 denotes an insert body of the horizontal insert A, which is formed in a curved shape. The inner wall surface of the nested body constitutes the inner wall surface of the rim portion forming space 93. Reference numerals 82 and 82 denote auxiliary pieces, which are connected to both end edges of the telescopic body 81 in a flat shape. These auxiliary pieces 82 and 82 are inserted into the insertion recesses 33 of the mold mating surfaces 35 and 35 in the horizontal mold 30. These auxiliary pieces 82, 82 are formed with tip portions of side gates 31. The side gate 31 also corresponds to the “thin cavity” in the present invention.
[0012]
Reference numeral 83 denotes an upper flange, which is connected to the upper end edge of the telescopic main body 81, and 84 is a lower flange, which is connected to the lower end edge of the telescopic main body 81. The upper flange 83 and the lower flange 84 are fastened and fixed to the horizontal mold 30 by bolts 85, 85,... While being inserted into the insertion recess 33 of the horizontal mold 30. 86, 86,... Are bolt holes in the upper flange, and 87, 87,... Are bolt holes in the lower flange.
[0013]
Reference numeral 22 denotes a cooling water channel provided in the lower mold 20 to cool the lower mold 20. Reference numeral 59 denotes a cooling water channel provided in the first insert 51 of the upper die 50, and the first insert 51 is cooled. In addition, 58 is a cooling air supply hole formed in the second insert 52, 57 is a cooling air supply pipe for that purpose, and is for cooling the second insert 52.
[0014]
Next, another embodiment will be described based on FIG.
In FIG. 3, 53 is a third insert of the upper die 50, and 54 is a fourth insert, and these inserts 53, 54 also partially constitute a wheel-shaped casting space S for a vehicle.
[0015]
Reference numeral 60 denotes a molten metal supply pipe, which is disposed below the mold apparatus M and is erected in a holding furnace (not shown). 61 is a molten metal storage chamber, which is installed at the upper end of the molten metal supply pipe 60. The molten metal storage chamber 61 is a place for temporarily storing the molten metal pressurized and supplied by the molten metal supply pipe 60. The stalks 62 and 63 are erected in the molten metal storage chamber 61. For this reason, the molten metal stored in the molten metal storage chamber 61 is poured into the casting space S through the center gate 21 and the side gate 31. The side gate 31 is formed at the boundary between the lower mold 20 and the horizontal mold 30.
[0016]
Next, reference numeral 70 denotes a rim front side forming member in the horizontal mold 30 and constitutes a main part of the horizontal mold 30. The cavity surface 71 of the rim front side forming member 70 is cast from the front bead seat portion B to the front flange portion of the vehicle wheel. Reference numeral 72 denotes an annular cutout portion of the rim front side forming member 70.
[0017]
Reference numeral 80 denotes a rim back side forming member in the horizontal mold 30. The rim back side forming member 80 is fitted into the annular cutout portion 72 of the rim front side forming member 70, and bolts 81, 81 are fixed to the rim front side forming member 70. The cavity surface 82 of the rim back side forming member 80 is connected to the cavity portion 72 of the rim front side forming member 70 in a flush state, and casts from the front bead sheet portion B to the back flange portion of the wheel.
[0018]
Since the volume of the rim front side forming member 70 is larger than the volume of the rim back side forming member 80, the portion cast by the rim front side forming member 70 is cooled more rapidly than the portion cast by the rim back side forming member 80. It is something that can be done. Further, even if the cavity surface (molten contact surface) of the rim front side forming member 70 is smaller than the cavity surface (molten contact surface) of the rim back side forming member 80, a portion cast by the rim front side forming member 70 is reduced. Since the heat absorption is larger than the portion cast by the rim back side forming member 80, it can be cooled rapidly.
[0019]
In any case, if the rim front side forming member 70 is made of a copper alloy having good thermal conductivity and the rim back side forming member 80 is made of iron, or the other side is made of iron, the rim front side forming member 70 is cooled by the cooling means. The above-mentioned effect can be more remarkably exhibited by providing the above.
[0020]
In addition, the space between the rim front side forming member 70 and the rim back side forming member 80 has the effect of enhancing the mutual heat insulating effect and the heat retaining effect of the rim back side forming member 80.
[0021]
【The invention's effect】
In the vehicle wheel mold apparatus according to the present invention, in the vehicle wheel mold apparatus having a thin rim portion forming space and a thin side gate opening to the rim portion forming space, one of the inner wall surfaces in the rim portion forming space is provided. Since the part and part of the inner wall surface of the side gate are configured by one insert, the heat of the thin rim forming space and the thin side gate is difficult to conduct to the mold and thus is not easily radiated to the atmosphere.
[0022]
Therefore, if this vehicle wheel mold device is used, the fluidity of the thin rim portion forming space and the thin side gate hot water can be easily maintained, so there is no need to make these portions thick. Compared with this, the product yield can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a mold apparatus for a vehicle wheel according to the present invention.
2 is a cross-sectional view taken along the line II-II in FIG. 1 (with the upper mold removed).
FIG. 3 is a cross-sectional view of another embodiment according to the present invention.
[Explanation of symbols]
A ... Horizontal type nesting (nesting)
B: Front bead seat M: Molding device for vehicle wheel
20… Mold for casting the outer surface of the rim (horizontal type)
31… Side gate (thin cavity)
80… Rim back side forming member
70… Rim front side forming member
93… Rim molding space (thin cavity)

Claims (1)

In a vehicle wheel casting mold apparatus having a thin rim portion forming space and a thin side gate opening into the rim portion forming space, a part of the inner wall surface and a part of the inner wall surface of the side gate in the rim portion forming space are combined. A mold apparatus for a vehicle wheel, characterized in that the apparatus is configured by inserting a hood.

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