JP5507312B2 - Wheel manufacturing method and wheel casting apparatus - Google Patents

Description

  The present invention relates to a technology for manufacturing a cast wheel.

The wheel includes a central hub portion, a plurality of spoke portions extending radially from the hub portion, and a rim portion that connects the tips of the spoke portions.
The cast wheel is a cast wheel manufactured by a casting mold. A casting mold in which a gate is provided near the hub portion is called a center gate type mold. In this center gate mold, the molten metal flows in the order of the hub part, the spoke part, and the rim part. Advanced technology is required to maintain a good hot water supply to the rim at the end.

Therefore, a rim gate type mold that prioritizes hot water around the rim has been proposed (see, for example, Patent Document 1 (FIGS. 1 and 10)).
In the rim gate method, the molten metal flows in the order of the rim portion, the spoke portion, and the hub portion. Since the molten metal flows to the rim portion at a high temperature, there is little fear that the hot rim will be defective in the rim portion, and the casting quality of the rim portion can be easily improved.

  As shown in FIG. 1 of Patent Document 1, a cavity (8) is provided between the fixed mold (9) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) and the movable mold (12). ) Is formed. A pouring passage (18) is provided so as to connect to the rim forming portion (8a) of the cavity (8), and the pouring is performed from the pouring passage (18) to the cavity (8).

  As shown in FIG. 10 of Patent Document 1, an injection port (51) is inevitably attached to the cast wheel material (20). The inlet (51) is as large as the width of the wheel blank (20). Since this large inlet (51) is an unnecessary part, it is excised in a later step. However, since an unnecessary part (injection port (51)) is large, it takes time for cutting, that is, grinding, and the cost of the grinding work increases.

  There is a need for a wheel material having a shape that allows an unnecessary portion to be easily excised.

JP 2009-136902 A

  This invention makes it a subject to provide the wheel raw material of a shape which can excise an unnecessary part easily.

The manufacturing method according to claim 1 is intended to manufacture a wheel including a hub portion, a plurality of spoke portions extending radially from the hub portion, and a rim portion that connects the tips of these spoke portions,
A cast mold comprising: a fixed mold that forms an outer surface of the hub section, the spoke section, and the rim section; a movable mold that matches the fixed mold; and a slide mold that forms a tire-side bottom wall surface of the rim section. A method of manufacturing a wheel for pouring water into a cavity to obtain the wheel,
A casting step of pouring into the cavity from the side end of the rim portion by providing a gate between at least one of the fixed die and the slide die or between the movable die and the slide die; ,
A trim step of cutting the cast wheel material so that the gate portion remains at the side end portion of the rim portion and other unnecessary portions are cut off,
A grinding process for grinding and removing the gate portion remaining on the side end portion of the rim portion when machining the bead seat and the rim flange of the trimmed wheel material.

  In the manufacturing method according to claim 2, the gate is provided between both the fixed mold and the slide mold, and between the movable mold and the slide mold, so that the hot water is poured from both end portions of the rim portion. It is characterized by that.

  The manufacturing method according to claim 3 is provided with a first overflow passage for overflowing the molten metal between at least one of the fixed mold and the slide mold or between the movable mold and the slide mold, The molten metal is allowed to overflow from the end.

  In the manufacturing method according to claim 4, a plurality of gates are provided so as to overlap a center line extending from the center of the wheel to a connection portion where the rim portion is connected to the spoke portion, and pouring from these gates into the cavity is performed. It is characterized by that.

In the manufacturing method according to claim 5, the hub portion, the spoke portion, and the rim portion are formed with a ridge portion by casting on a fixed part and a movable parting line,
The burrs remaining on the ridges of the cast wheel material are cut off by a press die that passes through a hole surrounded by the hub, the spoke, and the rim.

The casting apparatus according to claim 6 is a casting object including a hub portion, a plurality of spoke portions extending radially from the hub portion, and a rim portion connecting the tips of the spoke portions.
A wheel comprising: a fixed mold that forms the outer surface of the hub section, the spoke section, and the rim section; a movable mold that matches the fixed mold; and a pair of left and right slide molds that form the tire-side bottom wall surface of the rim section. A casting device of
Wherein between the fixed mold and the slide mold, or between the slide die and the movable die, at least one of, and pouring gate to the cavity is provided from the side end portion of the rim portion, left and right A branch runner that splits the molten metal to the fixed mold side and the movable mold side is provided on the slide mold mating surface,
The gate is provided between both the fixed type and the slide type, and between the movable type and the slide type .

The casting apparatus according to claim 7 is characterized in that a first overflow passage for overflowing the molten metal is provided in at least one of the fixed mold and the slide mold or between the movable mold and the slide mold. .

The casting apparatus according to claim 8 is characterized in that a plurality of gates are provided so as to overlap a center line extending from the center of the wheel to a connection portion where the rim portion is connected to the spoke portion.

In the manufacturing method according to the first aspect, the gate is provided on at least one of the fixed die and the slide die or between the movable die and the slide die. The gate provided between the fixed mold and the slide mold or between the movable mold and the slide mold is necessarily thin. Then, the gate part attached to the cast wheel material is thin and small. If it is small, the gate portion of the wheel material can be easily separated from the runner.
That is, according to the manufacturing method of the present invention, a wheel material having a shape in which unnecessary portions can be easily cut off is provided.

In the manufacturing method according to the second aspect, the gates are provided both between the fixed mold and the slide mold and between the movable mold and the slide mold.
Compared to the case where the gate is provided only between the fixed type and the slide type, or only provided between the movable type and the slide type, the gate is provided on both according to the present invention. The number of gates is doubled. The flow area of the gate can be easily secured.
In addition, since the molten metal is equally distributed between the fixed mold and the slide mold and between the movable mold and the slide mold, the hot water circulation property and the casting quality are improved.

In the manufacturing method according to the third aspect, the first overflow passage for overflowing the molten metal is provided between at least one of the fixed mold and the slide mold or between the movable mold and the slide mold.
The first overflow provided between the fixed mold and the slide mold or between the movable mold and the slide mold inevitably becomes thin. Then, the overflow part attached to the cast wheel material is thin and small. If it is small, the overflow portion of the wheel material can be easily separated from the wheel.

In the manufacturing method according to the fourth aspect, a plurality of gates are provided so as to overlap a center line extending from the center of the wheel to the connection portion where the rim portion is connected to the spoke portion.
The molten metal flows from the gate to the rim, spoke, and hub. Since a plurality of gates are provided so as to overlap the center line extending from the center of the wheel to the connection part where the rim part is connected to the spoke part, the molten metal flows linearly along the center line to the spoke part and the hub part. The hot water circulation is performed quickly and the casting quality can be improved.

In the manufacturing method according to the fifth aspect, the ridges are formed by casting on the fixed part and the movable parting line in the hub part, the spoke part, and the rim part, but the burrs remaining on the ridge part remain. Was cut with a press die passing through a hole surrounded by the hub, the spoke and the rim.
Since the burr projecting from the hub part, the burr projecting from the spoke part, and the burr projecting from the rim part are collectively cut with a press die, the operation cost for deburring can be reduced.

In the casting apparatus according to the sixth aspect, the gate is provided on at least one of the fixed die and the slide die or between the movable die and the slide die. The gate provided between the fixed mold and the slide mold or between the movable mold and the slide mold is necessarily thin. Then, the gate part attached to the cast wheel material is thin and small. If it is small, the gate portion of the wheel material can be easily separated from the runner.
That is, according to the casting apparatus of the present invention, it is possible to cast a wheel material having such a shape that unnecessary portions can be easily cut off.

In addition, in the casting apparatus according to claim 6 , a branch runner for diverting the molten metal to the fixed mold side and the slide mold side is provided on the mating surfaces of the pair of left and right slide molds. The branch runner has a relatively complex shape. With a pair of left and right slide-type mating surfaces, a T-shaped groove can be easily formed from the outside. That is, the branch runner can be easily formed.

The gates are provided both between the fixed mold and the slide mold and between the movable mold and the slide mold.
Compared to the case where the gate is provided only between the fixed type and the slide type, or only provided between the movable type and the slide type, the gate is provided on both according to the present invention. The number of gates is doubled. The flow area of the gate can be easily secured.
Further, since the molten metal is equally distributed between the fixed mold and the slide mold and between the movable mold and the slide mold, the hot water circulation property is improved.

In the casting apparatus according to the seventh aspect , the first overflow passage for overflowing the molten metal is provided between at least one of the fixed mold and the slide mold or between the movable mold and the slide mold.
The first overflow provided between the fixed mold and the slide mold or between the movable mold and the slide mold inevitably becomes thin. Then, the overflow part attached to the cast wheel material is thin and small. If it is small, the overflow portion of the wheel material can be easily separated from the wheel.

In the casting apparatus according to the eighth aspect , a plurality of gates are provided so as to overlap a center line extending from the center of the wheel to a connection portion where the rim portion is connected to the spoke portion.
The molten metal flows from the gate to the rim, spoke, and hub. Since a plurality of gates are provided so as to overlap the center line extending from the center of the wheel to the connection part where the rim part is connected to the spoke part, the molten metal flows linearly along the center line to the spoke part and the hub part. The hot water circulation is performed quickly and the casting quality can be improved.

It is a perspective view of the cast wheel material. It is a front view of the cast wheel material. It is explanatory drawing of a trim blade and a deburring press type | mold. It is a figure explaining the trimmed wheel material and a grinding process. It is a front view of the completed wheel. It is a perspective view of a casting mold. It is sectional drawing of a casting mold. It is a figure explaining the usage aspect of the completed wheel.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
The solidified metal remains on the cast wheel material at the “gate” portion of the casting apparatus. The residual metal in this case is called with a “part” added like a “gate part” of the wheel material. Similarly, the solidified metal at the portion of the “overflow passage” of the casting mold will be referred to as the “overflow portion” of the wheel material. That is, an element without “part” is an element in the casting apparatus, and an element with “part” is an element in the casting.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the cast aluminum alloy wheel material 10 includes upper and lower unnecessary portions 11 and 12 and a required portion 13 excluding the unnecessary portions 11 and 12.
The necessary portion 13 includes a central hub portion 15, a plurality of spoke portions 16 that extend radially from the hub portion 15, and a rim portion 17 that connects the tips of the spoke portions 16. The rim portion 17 includes a tire side bottom wall surface 18 that is a bottom surface on the tire side, and side wall portions 19 and 19 that extend radially outward so as to wrap the tire from both ends of the tire side bottom wall surface 18.

  The unnecessary portion 11 below includes a stamp portion 20, a single L-shaped runner 21 extending from the stamp portion 20, a branch runner portion 22 branching left and right from the L-shaped runner 21, and a branch runner portion 22. An arc-shaped runner portion 23 extending along the lower half of the rim portion 17, and a plurality of gate portions 24 (in this example, 6 locations on one side × 2 = a total of 8 locations on both sides) connected to the rim portion 17 from the arc-shaped runner portion Consists of.

  The upper unnecessary portion 12 includes a plurality of first overflow portions 26 extending upward from the rim portion 17 and arc-shaped first overflow portions extending along the upper half of the rim portion 17 so as to collect the first overflow portions 26. 2 overflow portion 27, third overflow portions 28 and 28 extending upward from the center of second overflow portion 27, and fourth overflow portion 29 for gathering left and right third overflow portions 28 and 28 together.

  As shown in FIG. 2, four gate portions 24 on one side are arranged so as to overlap a center line (line passing through the center) 33 extending from the center 32 of the wheel to the connection portion 31 where the rim portion 17 is connected to the spoke portion 16. Has been. With this arrangement, the molten metal flows almost linearly in the order of the gate portion 24, the spoke portion 16, and the hub portion 15, so that the molten metal flow can be improved.

  Further, the cast wheel material 10 passes along a trim line (circle indicated by an imaginary line) 34 that passes along the middle of the gate portion 24 in the longitudinal direction and passes through the boundary between the first overflow portion 26 and the second overflow portion 27. , Trimmed.

Furthermore, a space surrounded by the hub portion 15, the spoke portion 16, and the rim portion 17 is defined as a hole portion 35. The burrs 36, 37, and 38 protrude from the hub portion 15, the spoke portion 16, and the rim portion 17 toward the hole portion 35 because of a parting line of a casting mold that will be described later. The burrs 36, 37 and 38 need to be removed.
These burr removal and trim processing will be described in detail with reference to FIG.

  As shown in FIG. 3, first, the trim blade 39 is prepared. With this trim blade 39, the cast wheel material 10 is divided along the trim line 34. That is, the trim blade 39 divides the middle of the gate portion 24 in the longitudinal direction. At the same time, the trim blade 39 divides the boundary between the first overflow portion 26 and the second overflow portion 27. As a result, most of the unnecessary portions are removed.

  The hub portion 15 and the rim portion 17 are formed with ridge portions 41 and 42 by casting on fixed and movable parting lines described later. However, burrs 36 and 38 are inevitably left at the tips of the ridges 41 and 42. A ridge is also formed on the spoke (FIG. 2, reference numeral 16), and burrs remain on the ridge. It is recommended to remove these burrs 36 and 38 by the following procedure.

  A deburring press die 43 that passes through the hole 35 is prepared. With this press die 43, the burr 36 protruding from the hub portion 15 and the burr 38 protruding from the rim portion 17 are cut together. The same applies to the burr protruding from the spoke part (FIG. 2, reference numeral 37). In addition, it is recommended that the triangular hole 44 surrounded by the Y-shaped spoke portion 16 and the rim portion 17 shown in FIG.

  Next, as shown in FIG. 4, a grinding tool 45 such as a rotating grindstone is prepared, and the tire-side bottom wall surface 18 of the rim portion 17 is finished using the trimmed wheel material 46 as a processing target. At this time, the bead sheet 47 and the rim flange 49 indicated by an imaginary line are finished, and the gate portion 24 is also removed simultaneously with this finishing process.

  As a result, a wheel 48 as shown in FIG. 5 can be obtained. That is, the wheel 48 includes a hub portion 15, a plurality of spoke portions 16 that extend radially from the hub portion 15, and a rim portion 17 that connects the tips of these spoke portions 16.

The wheel 48 having such a configuration can be employed as a wheel of a motorcycle. An aluminum alloy wheel, magnesium alloy wheel, or titanium alloy wheel that can be reduced in weight is better, but a cast iron wheel can be used.
Next, the casting technique of the wheel material that is the starting material of the wheel 48 will be described.

  As shown in FIG. 6, the casting apparatus 50 includes a fixed mold 51, a movable mold 52 that moves toward the fixed mold 51, and a left slide mold 53 that is inserted and removed between the movable mold 52 and the fixed mold 51. The right slide mold 54 is a main element. The left slide mold 53 has a curved surface 58 that forms a tire side bottom wall surface (FIG. 1, reference numeral 18). Similarly, the right slide mold 54 has a curved surface 58.

A branch runner 56 for diverting the molten metal to the fixed mold 51 side and the movable mold 52 side is provided on the mating surfaces 55 and 55 of the pair of left and right slide molds 53 and 54.
If the mating surfaces 55 of the pair of left and right slide molds 53 and 54, the T-shaped groove 57 can be easily formed from the outside. That is, the branch runner 56 can be easily formed.
Next, a cross-sectional view in which the slide molds 53 and 54 are inserted between the fixed mold 51 and the movable mold 52 in the mold assembling step will be described.

As shown in FIG. 7, a cavity 59 is formed between the fixed mold 51, the movable mold 52, and the slide mold 54. The cavity 59 is a casting space for casting the hub portion 15 shown in FIG. 1, a plurality of spoke portions 16 extending radially from the hub portion 15, and a rim portion 17 that connects the tips of the spoke portions 16. .
Convex ridge cavities 62 and 63 are provided along a parting line 61 between the fixed mold 51 and the movable mold 52.

In addition, a gate 64 is provided between the lower portion 54 a of the slide die 54 and the fixed die 51, and a gate 64 is provided between the lower portion 54 a of the slide die 54 and the movable die 52.
As a result, the molten metal passes through the sprue 65, the branch runner 56, and the arc-shaped runners 66 and 66, and further reaches the cavity 59 through the gates 64 and 64.

Further, first overflow passages 67 and 67 are provided between the slide type upper part 54 b and the fixed mold 51 and between the slide type upper part 54 b and the movable mold 52.
After filling the cavity 59, the molten metal rises in the order of the first overflow passages 67 and 67, the second overflow passages 68 and 68, the third overflow passages 69 and 69, and the fourth overflow passage 70.

  That is, the casting apparatus 50 of the present invention has a structural feature that the left and right gates 64 and 64 are used to pour hot water into the left and right side wall cavities 71 and 71, respectively. The effect will be described later.

The casting apparatus 50 described above and the manufacturing method and operation performed using the casting apparatus 50 will be described below.
First, in the manufacturing method of the present invention, in FIG. 7, the rim portion is provided by providing a gate 64 at least one of the fixed mold 51 and the slide mold 54 (or between the movable mold 52 and the slide mold 54). (FIG. 1, reference numeral 17) A casting process of pouring from the side end portion (FIG. 1, reference numeral 19) into the cavity 59, and the wheel material 10 cast in FIG. A trim step for removing other unnecessary portions so as to remain on the side end portion 19 and a side end portion of the rim portion 17 when machining the tire side bottom wall surface 18 of the trimmed wheel material 46 in FIG. 19 and a grinding process for grinding and removing the gate portion 24 remaining in the gate 19.

That is, in the manufacturing method of the present invention, as shown in FIG. 7, the gate 64 is provided between at least one of the fixed mold 51 and the slide mold 54 or between the movable mold 52 and the slide mold 54.
The gate 64 provided between the fixed mold 51 and the slide mold 54 or between the movable mold 52 and the slide mold 54 is necessarily thin.

Then, as shown in FIG. 3, the gate portion 24 attached to the cast wheel material 10 is thin and small. If it is small, the gate part 24 of the wheel material 10 can be easily separated from the arc-shaped runner 23.
That is, according to the manufacturing method of the present invention, a wheel material 10 having a shape that can easily cut an unnecessary portion (FIG. 1, reference numerals 11 and 12) is provided.

The gate 64 may be provided between the fixed mold 51 and the slide mold 54 (or between the movable mold 52 and the slide mold 54). However, as shown in FIG. It is desirable to provide both between the movable mold 52 and the slide mold 54, and between the movable mold 52 and the slide mold 54.
Compared to the case where the gate 64 is provided only between the fixed die 51 and the slide die 54, or only provided between the movable die 52 and the slide die 54, the gates 64 are provided on both. Therefore, the number of gates 64 is doubled. The flow area of the gate 64 can be easily secured.
Moreover, since the molten metal is equally distributed between the fixed mold 51 and the slide mold 54 and between the movable mold 52 and the slide mold 54, the hot water circulation property is improved.

In addition, a first overflow passage 67 is provided in at least one of the fixed mold 51 and the slide mold 54 or between the movable mold 52 and the slide mold 54 to allow the molten metal to overflow.
The first overflow passage 67 provided between the fixed mold 51 and the slide mold 54 or between the movable mold 52 and the slide mold 54 inevitably becomes thin. Then, as shown in FIG. 1, the first overflow portion 26 attached to the cast wheel material 10 is thin and small. If small, the first overflow portion 26 can be easily separated from the wheel.

  As shown in FIG. 2, a plurality of gate portions 24 are provided so as to overlap a center line 33 extending from the wheel center 62 to the connection portion 31 where the rim portion 17 is connected to the spoke portion 16. The molten metal flows from the gate portion 24 to the rim portion 17, the spoke portion 16, and the hub portion 15 in this order. Since a plurality of gate portions 24 are provided so as to overlap the center line extending from the center of the wheel to the connection portion 31 where the rim portion 17 is connected to the spoke portion 16, the molten metal is substantially along the center line 33. And flows almost linearly to the hub portion 15. The hot water circulation is performed quickly and the casting quality can be improved.

Further, as shown in FIG. 3, the ridges 41 and 42 are cast on the hub part 15, the spoke part and the rim part 17 on the fixed and movable parting lines (reference numeral 61 in FIG. 7). However, the burrs 36 and 38 remaining on the ridges 41 and 42 are cut off by a deburring press die 43 that passes through the hole 35.
Since the burr 36 projecting from the hub part 15, the burr projecting from the spoke part, and the burr 38 projecting from the rim part 17 are cut together by the press die 43, the work cost for deburring can be reduced. it can.

  As mentioned above, although the effect | action and effect of the casting apparatus 50 and the effect | action and effect of the manufacturing method implemented using this casting apparatus 50 were demonstrated, the wheel (FIG. 5, code | symbol 48) manufactured with this manufacturing method is also the same effect | action, The effect is demonstrated.

Next, how to use the wheel (finished wheel) 48 shown in FIG. 5 will be described.
As shown in FIG. 8, the wheel 80 includes a wheel 48 provided with a through hole 81, a tire 82 attached to the outer periphery of the wheel 48, a collar member 83 inserted into the through hole 81, and the collar. The left and right bearings 84L and 84R inserted on both sides of the member 83, the third bearing 85 disposed on the outer side in the vehicle width direction of the left bearing 84L, and the outside of the third bearing 85 and the right bearing 84R. Seal members 86L and 86R to be inserted, a left recess 87 provided on the left side surface of the wheel 48, a bottom member 89 placed on the bottom 88 of the left recess 87, and a vehicle of the bottom member 89 and the left recess 87 A damper storage chamber 90 formed outward in the width direction, an elastic body 91 placed in the bottom member 89 in the damper storage chamber 90, and a claw 92 inserted into the elastic body 91. An inner driven flange 93, a driven sprocket 95 fastened to the final driven flange 93 by a first bolt 94, a right recess 96 provided on the right side surface of the wheel 48, and a second bolt outside the right recess 96. The pulsar ring 98 and the brake disk 99 fastened by 97 are the main components.

As described above, the wheel 48 includes the hub portion 15 provided with the through hole 81, the spoke portion 16 extending outward from the hub portion 15, and the tire 82 attached to the tip of the spoke portion 16. The rim portion 17 is formed.
Specifically, the bead seat 47 and the inner side surface of the rim flange 49 are formed at both ends of the tire-side bottom wall surface 18. The bead 101 of the tire 82 is in good contact with the bead sheet 47. That is, the bead sheet 47 becomes a contact surface of the bead 101 of the tire 82. Further, the outer surface of the bead 101 is in good contact with the inner surface of the rim flange 49.

  The present invention is suitable for a wheel mounted on a front wheel and / or a rear wheel of a motorcycle, but can also be applied to a tricycle or a four-wheel vehicle. The present invention is suitable for an aluminum alloy wheel, but can also be applied to a cast iron wheel, a magnesium alloy wheel, or a titanium alloy wheel.

  The present invention is suitable for an aluminum alloy wheel of a motorcycle.

  DESCRIPTION OF SYMBOLS 10 ... Cast wheel material 11, 12 ... Unnecessary part, 13 ... Necessary part, 15 ... Hub part, 16 ... Spoke part, 17 ... Rim part, 18 ... Tire side bottom wall part, 19 ... Side wall part, 24 ... Gate part, 26 ... first overflow part, 31 ... connection part, 32 ... center, 33 ... center line, 34 ... trim line, 35 ... hole part, 36, 38 ... burr, 39 ... trim blade, 41, 42 ... convex Strip, 43 ... Deburring press, 45 ... Grinding tool, 46 ... Trimmed wheel material, 47 ... Bead sheet (contact surface), 48 ... Wheel, 49 ... Rim flange, 50 ... Casting device, 51 ... Fixed 52, movable type, 53 ... slide type (right slide type), 54 ... slide type (left slide type), 55 ... sliding mating surface, 56 ... branch runner, 59 ... cavity, 61 ... parting line, 64 Gate, 67 ... first overflow passage 82 ... tire, 101 ... bead.

Claims (8)

A wheel (48) comprising a hub portion (15), a plurality of spoke portions (16) extending radially from the hub portion (15), and a rim portion (17) connecting the tips of these spoke portions (16). The production target
A fixed die (51) forming an outer surface of the hub portion (15), the spoke portion (16) and the rim portion (17), a movable die (52) adapted to the fixed die (51), and the rim portion A wheel manufacturing method for obtaining the wheel (48) by pouring into a cavity (59) of a casting mold comprising a slide mold (53, 54) forming a tire side bottom wall surface (18) of (17). There,
A gate (64) is provided on at least one of the fixed die (51) and the slide die (53, 54) or the movable die (52) and the slide die (53, 54). A casting step of pouring the rim portion (17) from the side end portion (19) into the cavity (59);
A trim step of cutting the cast wheel material (10) so that the gate portion (24) remains on the side end portion (19) of the rim portion (17) and other unnecessary portions (11, 12) are cut off;
The gate portion (24) remaining at the side end portion (19) of the rim portion (17) when the bead seat (47) and the rim flange (49) of the trimmed wheel blank (46) are machined. And a grinding process for grinding and removing the wheel.   The gate portion (24) is provided between the fixed die (51) and the slide die (53, 54) and between the movable die (52) and the slide die (53, 54). The wheel manufacturing method according to claim 1, wherein the wheel is poured from both end portions (19, 19) of the rim portion (17).   A first overflow that causes the molten metal to overflow into at least one of the fixed die (51) and the slide die (53, 54) or the movable die (52) and the slide die (53, 54). The wheel manufacturing method according to claim 1, wherein a passage (67) is provided, and the molten metal is allowed to overflow from a side end (19) of the rim portion (17).   A plurality of the gates (64) are provided so as to overlap a center line (33) extending from the center of the wheel (48) to a connection part (31) where the rim part (17) is connected to the spoke part (16). The method for manufacturing a wheel according to claim 1, wherein hot water is poured from the gate (64) into the cavity (59). On the hub part (15), the spoke part (16) and the rim part (17), a protruding line part is formed on the parting line (61) of the fixed mold (51) and the movable mold (52). (41, 42) is formed by casting,
The burrs (36, 38) remaining on the ridges (41, 42) of the cast wheel material (10) are the hub part (15), the spoke part (16), and the rim part (17). The wheel manufacturing method according to claim 1, wherein the wheel is cut with a deburring press die (43) that passes through a hole (35) surrounded by the wheel. A wheel (48) comprising a hub portion (15), a plurality of spoke portions (16) extending radially from the hub portion (15), and a rim portion (17) connecting the tips of these spoke portions (16). For casting,
A fixed die (51) forming an outer surface of the hub portion (15), the spoke portion (16) and the rim portion (17), a movable die (52) adapted to the fixed die (51), and the rim portion A wheel (48) casting apparatus comprising a pair of left and right slide molds (53, 54) forming a tire side bottom wall surface (18) of (17),
The rim portion (17) is provided between at least one of the fixed die (51) and the slide die (53, 54) or between the movable die (52) and the slide die (53, 54). A gate (64) for pouring from the side wall portion (19) to the cavity (59) is provided ,
A branch runner (56) for diverting the molten metal to the fixed mold (51) side and the movable mold (52) side is provided on the mating surface (55) of the pair of left and right slide molds (53, 54),
The gate (64) is provided both between the fixed mold (51) and the slide mold (53, 54) and between the movable mold (52) and the slide mold (53, 54). casting apparatus of the wheel, characterized by being.   A first overflow that causes the molten metal to overflow into at least one of the fixed die (51) and the slide die (53, 54) or the movable die (52) and the slide die (53, 54). 7. A wheel casting apparatus according to claim 6, wherein a passage (67) is provided.   The gate (64) is overlapped with a center line (33) extending from the center (32) of the wheel (48) to a connection part (31) where the rim part (17) is connected to the spoke part (16). The wheel casting apparatus according to claim 6, wherein a plurality of wheels are provided.

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