JP3266734B2 - Casting method and casting device for vehicle wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for casting a vehicle wheel, and more particularly to a method and apparatus for continuously casting a vehicle wheel having a disk portion and a rim portion by gravity casting. It relates to improvement of a casting device.

[0002]

2. Description of the Related Art As is well known, a wheel made of a light alloy such as an aluminum alloy material, that is, a so-called light alloy wheel, is frequently used in current automobile wheels. Such light alloy wheels have various structures such as one-piece wheels, two-piece wheels, and three-piece wheels, and rims and disks forming the wheels have various methods of forming.

[0003] In particular, gravity casting is widely used as a casting method for a one-piece wheel for integrally molding a disk portion and a rim portion.
For example, as compared with a low pressure casting method, a die casting method, or the like, there is an advantage that a structure of a mold and a casting facility used for casting is simple, and a light alloy wheel can be cast at low cost.

However, in the conventional gravity casting method, when pouring the molten metal from the gate, the air in the mold cavity is easily entrained in the molten metal. If it does not flow into the casting, there is a problem that the cast light alloy wheel tends to cause casting defects such as blow holes. Therefore, in order to prevent the entrainment of air as described above, a runner is usually provided in the mold for pouring the molten metal into the mold cavity gently through a weir, but these runners are used for casting a casting material. The amount is increased and remains in the casting as a gate mark even after casting. For this reason, there is a problem that more casting material is necessary than necessary at the time of casting, and it takes time to remove and finish these gate marks.

The inventors of the present invention have conducted intensive studies to improve the problems of the gravity casting method. As a result, air entrapment when pouring the molten metal into the mold cavity was performed without providing a runner in the mold. A casting method for vehicle wheels that can be prevented has been developed. First, a casting apparatus 1 used in the above-described casting method for integrally molding a vehicle wheel will be described with reference to FIG. The casting apparatus 1 is supported by a drive shaft 2 extending in a horizontal direction (a direction perpendicular to the plane of the drawing), and swings between a horizontal state and a state in which the casting apparatus 1 swings clockwise in FIG. Swing base 3 that can be freely adjusted
The mold body 13 is mounted and fixed thereon.

The mold body 13 is slidable in a horizontal direction with a lower mold 4 fixed on the swing base 3, an upper mold 6 that can move up and down with respect to the lower mold 4. It is configured by combining a plurality of horizontal dies 5. The cavity 7 formed in the mold body 13 includes a disk forming space 7a forming a disk portion of the wheel and an outer rim forming space 7b forming an outer rim portion at a lower portion of the mold, and an inner rim portion. Is formed so as to extend toward the upper part of the mold, and a cavity is formed so that the design surface of the disk portion faces downward. That is, the lower die 4 corresponding to the disk forming space 7a forms the design surface of the wheel disk portion, and the upper die 6 forms the hub mounting surface of the wheel disk portion.

[0007] The inner rim forming space 7c
Above the rim flange forming space portion, which is the upper edge of the rim flange forming space portion, a plurality of feeder recesses 8 arranged at equal intervals along the periphery of the rim flange forming space portion are formed. A recess 12 for a feeder is formed in a portion corresponding to the center of the portion 7a. Further, when the mold body 13 is swung around the drive shaft 2 in the clockwise direction in the figure and tilted, a push formed so as to face the lowermost portion of the inner rim forming space 7c. Above the concave portion 8 for hot water, a ladle 10, which is a ladle-shaped basin portion, is attached, and a spout 9 that opens toward the upper side of the mold body 13 so as to communicate with the ladle 10 is formed.

The ladle 10 receives the molten metal in a state where the mold body 13 is tilted, and fills the molten metal through the spout 9 as the mold body 13 is gradually returned from the tilted state to a horizontal state. This is a hot water pool configured to be able to pour water inside. Next, a method of casting a vehicle wheel using the above-described casting apparatus 1 will be described with reference to FIGS.

First, as shown in FIG. 8, the drive shaft 2 is rotated to incline the mold body 13 in the clockwise direction in the figure to keep the ladle 10 substantially horizontal, and the molten metal from the ladle 11 is inserted into the ladle 10. 14 is supplied. Thereafter, as shown in FIG. 9, the mold body 13 is gradually rotated counterclockwise in the drawing from the tilted state to return to the horizontal state.
The molten metal 14 in the inside gradually flows into the cavity 7 through the gate 9. After the molten metal 14 has cooled and solidified, FIG.
By opening the mold body 13 as shown in FIG. 7, the casting 15 of the vehicle wheel is taken out to complete the casting process.

In the above-described method for casting a vehicle wheel, the injection speed of the molten metal 14 into the cavity 7 is appropriately controlled according to the rotation speed of the drive shaft 2 for returning the mold body 13 from the inclined state to the horizontal state. At the same time, the molten metal 14 is gradually poured from the ladle 10 to the lowermost portion of the cavity 7 at the inclination angle thereof, so that the molten metal 14 can gradually enter the lower side of the air existing inside the cavity 7. Therefore, the molten metal 14 poured into the cavity 7 is hardly entrained in air, and casting defects caused by entrained air are hardly generated in the cast vehicle wheel.
Therefore, in order to pour the molten metal into the mold cavity gently, there is no need to provide a runner in the mold as in the related art.

Further, by providing the sprue 9 above the recess 8 for the sprue, the sprue part 15a of the casting to be finally solidified can coincide with the sprue of the casting to be finally solidified. The sluice portion, which has been solidified and has the lowest strength, is not cut along with the feeder portion 15a and does not remain in the product portion. In addition, a fine gate mark 15 without a mark on the runner
Since b is also removed by cutting the riser portion 15a, there is no need to perform extra processing for cutting the gate mark 15b in the subsequent machining, and the time required for finishing can be shortened. Having.

[0012]

However, in the method of casting a wheel for a vehicle using the mold apparatus 1 described above, since the gate 9 is provided in one place, the temperature of the mold near the gate 9 increases. On the other hand, the temperature of the mold at the portion opposite to the gate 9 with respect to the center of the mold body 13 is likely to decrease, and the temperature distribution of the mold body 13 tends to be unbalanced.

Therefore, the temperature of the molten metal increases in a portion near the gate 9 and the cast structure of the cast wheel tends to be coarsened and the strength tends to decrease, but the temperature of the molten metal in the portion opposite to the gate 9 is increased. And it is easy to obtain sufficient strength, so that a high strength part and a low strength part are mixed in the rim part of one vehicle wheel, which is unfavorable in terms of its characteristics as a rotating vehicle wheel. Become.
In addition, casting defects such as shrinkage cavities due to shrinkage during solidification can occur in the casting part where the mold temperature is high and solidification lasts, and blowholes such as blow holes in which the gas in the molten metal remains inside the casting where the mold temperature is low and the periphery of the casting tends to solidify quickly. There is.

Further, since the temperature of the molten metal near the gate 9 becomes high, the time required for cooling and solidifying takes a long time, so that the cycle time required for one casting (one shot) becomes long, and the production efficiency decreases. I will. Accordingly, an object of the present invention is to solve the above-mentioned problems, and a method of casting a vehicle wheel capable of continuously producing a good vehicle wheel by suppressing the occurrence of casting defects and increasing production efficiency, and a good vehicle wheel. It is to provide a casting device.

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sprue communicating with a feeder disposed above a rim flange forming space of a mold cavity, and a ladle-shaped pool near the entrance of the sprue. After the mold is tilted to pour the molten metal into the puddle part, the molten metal is poured into the puddle part, and thereafter the molten metal is poured into the mold cavity by returning the mold to a horizontal position, and the disc part and the rim are poured. A method of casting a vehicle wheel, comprising integrally molding a vehicle wheel having a portion, wherein at least a pair of feeder portions including the gate and the basin portion face each other across a center axis of the wheel. A vehicle wheel, which is disposed above the rim flange forming space portion, and wherein the vehicle wheel is continuously and integrally formed by pouring a molten metal from each pool portion alternately for each shot. It is achieved by casting methods Eel.

The above object is also achieved by providing a mold body for integrally molding a vehicle wheel having a disk portion and a rim portion, the mold body being disposed at equal intervals along the peripheral edge of the rim flange molding space above the rim flange molding space of the mold cavity. , A plurality of taps disposed in the vicinity of each other, a plurality of taps respectively connected to at least a pair of the tapping sections facing each other across the center axis of the wheel, and provided near the entrance of each tap. And a mold tilting means for alternately tilting the mold body in both directions for each shot with the center axis of the wheel interposed therebetween so as to pour the molten metal into each of the pools. This is achieved by a featured vehicle wheel casting apparatus.

[0017]

According to the casting method and the casting apparatus for a vehicle wheel, the injection speed of the molten metal into the cavity can be appropriately controlled in accordance with the speed of returning the mold body from the tilted state to the horizontal state, and the molten metal can be controlled. The molten metal is gradually poured from the hot-water pool into the lowest portion of the cavity at the tilt angle, and can gradually enter the lower side of the air existing inside the cavity. The molten metal is hardly entrained in air, and there is no need to provide a runner in the mold.

Further, by providing the gate above the feeder portion, the feeder portion of the casting to be solidified last can be matched with the gate of the casting to be solidified last, and the solidification last and the highest strength can be achieved. The gate portion, which is liable to decrease, is not cut along with the feeder portion and does not remain in the product portion, and traces of the gate are removed by cutting the feeder portion. Furthermore, a pair of gates are disposed so as to face each other with the center of the mold body interposed therebetween, and each gate is located at a position where the temperature of the molten metal poured from the opposing gate is likely to decrease,
By pouring the molten metal alternately for each shot from these gates, the part having a low mold temperature alternates around the gate having a high mold temperature, and the temperature distribution of the mold body is leveled and the temperature of the entire mold body also decreases. The cooling rate of the casting increases.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a casting apparatus and a casting apparatus for a vehicle wheel according to the present invention. Here, FIG. 1 is a schematic cross-sectional view schematically showing a vehicle wheel casting apparatus according to the present embodiment, and FIGS. 2 to 6 are schematic cross-sectional views for explaining the flow of a casting method according to the present embodiment. .

The casting apparatus 20 is supported by a drive shaft 22 extending in a horizontal direction (a direction perpendicular to the plane of the drawing), and swings and tilts in a horizontal state and clockwise and counterclockwise directions in the drawing. A mold main body 33 is mounted and fixed on a swing base 23 which is a mold tilting means capable of swinging between the states. The mold main body 33 includes the swing base 23.
It is configured by combining a lower die 24 fixed on the upper side, an upper die 26 that can be raised and lowered with respect to the lower die 24, and a plurality of horizontal dies 25 that are slidable in the horizontal direction. The cavity 27 formed in the mold body 33 has a disk molding space 27a forming the disk portion of the wheel and an outer rim molding space 27b forming the outer rim portion at a lower portion of the mold, and an inner rim portion. Is formed so as to extend toward the upper part of the mold, and a cavity is formed so that the design surface of the disk portion faces downward. That is, the lower mold 24 corresponding to the disk forming space 27a forms the design surface of the wheel disk,
The upper die 26 forms a hub mounting surface of the wheel disk portion.

The inner rim forming space 27
Above the rim flange forming space, which is the upper edge of c, a plurality of feeder recesses 28 arranged at equal intervals along the periphery of the rim flange forming space are formed, and In the part that matches the center of the space 27a,
A recess 34 for a hot water is formed. Further, when the mold body 33 is tilted by swinging around the drive shaft 22 in the clockwise direction and the counterclockwise direction in the figure, the mold body 33 faces the lowermost portion of the inner rim forming space 27c. A pair of ladles 3, which are a pair of ladle-shaped pools facing each other across the central axis of the wheel, are provided above the pair of recesses 28 for hot water formed as described above.
First and second spouts 29 and 30 are formed on the upper side of the mold body 33 so that the first and second ladles 31 and 32 are connected thereto and communicate with the first and second ladles 31 and 32. That is, the first and second gates 29, 30 are respectively connected to a pair of recesses 28, 28 for the hot water which are opposed to each other with the center axis of the wheel interposed therebetween.

The first and second ladles 31, 32 are:
Each of the mold bodies 33 receives the molten metal in a state where the mold body 33 is tilted in each swinging direction, and the molten metal is gradually returned from the tilted state to the horizontal state by the first and second gates 29, 29. Cavity 2 through 30
7 is a hot-water pool configured to be able to be poured into the inside of the hot-water bath 7.

Next, a method of casting a vehicle wheel using the casting apparatus 20 will be described with reference to FIGS. First, as shown in FIG. 2, the drive shaft 22 is rotated to incline the mold body 33 in the clockwise direction in the figure, so that the first ladle 31 is kept substantially horizontal, and a ladle is placed in the first ladle 31. The molten metal 14 is supplied from 11. Thereafter, as shown in FIG. 3, when the mold body 33 is gradually rotated counterclockwise in the figure from the tilted state to return to the horizontal state, the molten metal 14 in the first ladle 31 passes through the first gate 29. And gradually flows into the cavity 27. Then, after the molten metal 14 is cooled and solidified, as shown in FIG.
By opening 3, the cast product 15 of the vehicle wheel is taken out to complete the first casting process.

Next, as shown in FIG.
5, the drive shaft 22 is rotated as shown in FIG. 5 to incline the mold body 33 in the counterclockwise direction in the figure, and the second ladle 32 is kept substantially horizontal. The molten metal 14 is supplied from the ladle 11 into the ladle 32. Thereafter, as shown in FIG. 6, when the mold main body 33 is gradually rotated clockwise in the figure from the tilted state to return to the horizontal state,
The molten metal 14 in the second ladle 32 gradually flows into the cavity 27 through the second gate 30. And molten metal 1
After the cooling and solidification of the mold body 4, the mold body 33 as shown in FIG.
, The casting 15 of the vehicle wheel is taken out to complete the second casting process.

Then, the molten metal 14 is poured from the first and second ladles 31 and 32 alternately for each shot in which the molten metal 14 is poured into the cavity 27 to continuously integrate the casting 15 of the vehicle wheel. In order to form, the first and second casting steps are alternately repeated. At this time, the injection speed of the molten metal 14 into the cavity 27 can be appropriately controlled according to the rotation speed of the drive shaft 22 that returns the mold body 33 from the inclined state to the horizontal state, and the first and second molten metals 14 can be respectively controlled. 2 is gradually poured into the lowermost portion of the cavity 27 at its tilt angle from the ladles 31, 32, and the molten metal 14 can gradually enter the lower side of the air existing inside the cavity 27. Cavity 2
The molten metal 14 poured into 7 becomes hard to entrain air,
Casting defects due to entrainment of air are less likely to occur in the cast vehicle wheel. That is, air can be prevented from being entrained when pouring the molten metal without providing a runner for pouring the molten metal into the mold cavity gently in the mold. There is no trouble or trouble in finishing.

Further, the pair of gates 29 and 30 are
3 are disposed so as to face each other with the center of the center 3 interposed therebetween, and the respective gates 29, 30 are located at positions where the temperature of the molten metal 14 poured from the respective opposite gates 30, 29 tends to decrease. By pouring the molten metal 14 alternately every shot from 29 and 30, the part with the low mold temperature alternately turns around the gate with the high mold temperature, and the mold body 33.
And the temperature of the entire mold is reduced, and the cooling rate of the casting is increased.

As a result, the strength of the rim portion of the vehicle wheel becomes uniform in the circumferential direction, and shrinkage cavities are likely to be formed in the casting portion where the mold temperature is high and finally solidified, and the outer periphery of the casting is easily solidified and the mold temperature is low. Casting defects such as blow holes generated inside the casting are less likely to occur. In addition, since the cooling speed of the cast wheel is increased and the casting structure is refined and its strength can be increased, not only can the wheel be made thinner and lighter, but also the casting weight can be reduced. The manufacturing cost can be reduced, and the time required for casting can be shortened to improve mass productivity.

Further, a pair of opposing recesses 2 for the hot water are provided.
By providing gates 29, 30 above 8, 28,
The feeder portion 15a of the casting to be finally solidified can be matched with the gate of the casting to be finally solidified, and the gate portion which is the last to solidify and has the lowest strength is the feeder portion 15
It is not cut along with a and remains on the product part. Furthermore,
Minor gate mark 15b with no trace of hot runner is also used as hot water part 15.
Since a is removed by cutting a, there is an advantage that extra processing for cutting the gate mark 15b is not required in machining in a subsequent process, and the time required for finishing processing can be shortened.

The casting apparatus for a vehicle wheel according to the present invention is not limited to the above embodiment, but includes a mold structure such as an upper mold, a lower mold, a horizontal mold, etc., which constitutes a mold body, as well as a basin and a feeder. The shape and number of the parts can be variously changed. In order to obtain a high quality casting, a chill, a gas vent, and the like are provided as needed. Also, in the casting apparatus 20 of the above embodiment, a pair of ladles 11 are arranged on the left and right in the figure to facilitate understanding of the casting method of the present invention.
The example in which the molten metal 14 is alternately supplied to the first and second ladles 31 and 32 has been described.
The mold body 33 can be rotated 180 degrees for each shot.
The first and second alternately from one ladle 11
May be configured to supply the molten metal 14 to the ladles 31 and 32.

[0030]

According to the method and apparatus for casting a vehicle wheel of the present invention, the injection speed of the molten metal into the cavity can be appropriately controlled according to the speed at which the mold body is returned from the tilted state to the horizontal state. At the same time, the molten metal is gradually poured from the pool to the lowermost portion of the cavity at the inclination angle thereof, and can gradually enter the lower side of the air existing inside the cavity. The molten metal is hardly entrained in air, and casting defects due to entrained air hardly occur in the cast vehicle wheel. That is, air can be prevented from being entrained when pouring the molten metal without providing a runner for pouring the molten metal into the mold cavity gently in the mold. There is no trouble or trouble in finishing.

Further, by providing a gate above the feeder portion, the feeder portion of the casting that is to be finally solidified can be matched with the gate of the casting that is to be solidified last, so that the solidification last and the highest strength can be achieved. The sprue portion, which tends to decrease, is not cut along with the feeder portion and does not remain in the product portion, and the minute spigot mark having no trace of the runner is also removed by cutting the feeder portion. Therefore, extra processing for cutting the gate mark is unnecessary in the mechanical processing in the subsequent step, and the time required for the finishing processing can be reduced.

Further, a pair of gates are disposed so as to face each other with the center of the mold body interposed therebetween, and each gate is located at a position where the temperature of the molten metal poured from the opposing gate is likely to decrease. By pouring the molten metal alternately every one shot from these gates, the part having a low mold temperature alternates around the gate having a high mold temperature, so that the temperature distribution of the mold body is leveled and the temperature of the entire mold body also decreases. As a result, the cooling rate of the casting is increased.

Therefore, the strength of the rim portion of the vehicle wheel becomes uniform in the circumferential direction, and a shrinkage cavity which is likely to be formed in a casting portion where the mold temperature is high and finally solidified, and a casting where the mold temperature is low and the outer periphery of the casting is easily solidified quickly Casting defects such as blowholes generated inside the steel. Also, since the cooling speed of the cast wheel is increased and the casting structure is refined and its strength can be increased, not only can the wheel be made thinner and lighter, but also the casting weight can be reduced and manufactured. The cost can be reduced, and the time required for casting (cycle time) can be shortened to improve mass productivity.

Therefore, it is possible to provide a casting method and a casting apparatus for a vehicle wheel capable of suppressing the occurrence of casting defects, increasing production efficiency, and continuously and integrally forming a good vehicle wheel.

[0035]

EXAMPLES The effects of the method and apparatus for casting a vehicle wheel of the present invention can be clarified by the following examples and comparative examples. (Example) Using a mold body having substantially the same structure as the casting apparatus 20 in the above embodiment, a test piece 40 having a shape schematically shown in FIG. 11 was produced by the casting method of the present invention. Note that first and second feeder portions 42 and 41 are provided at both ends in the longitudinal direction of the test piece 40, respectively, and the first and second ladles are provided above the first and second feeder portions 42 and 41. 44 and 43 were provided.

The material used for casting the test piece 40 is AC4C, the temperature of the molten metal is 740 ° C. ± 10 ° C., and the mold body is preheated by a heater until the mold temperature reaches 300 ° C., and the solidification time is 90 ° C. Second and the cycle time were 120 seconds. Then, the ladles 44 and 43 on both sides are
The test pieces 40 were continuously cast by using the shots alternately, and the test pieces 40 were cast by using the ladle 44 on the right side of FIG. .

A point A of the test piece 40 located farthest from the ladle 44 used for casting, an E point of the test piece 40 located closest to the ladle 44,
And C of the test piece 40 which is an intermediate point between the points A and E
In the portions corresponding to the three points, the mold temperature of the mold body when the test piece 40 was collected was measured. (Comparative Example) The mold body used in the above embodiment is used as it is, but it is always a one-sided casting in which the casting is continuously performed using the right ladle 44 shown in the drawing, and the other casting conditions are the same as those in the above embodiment. And the test piece 4 having the same shape as the embodiment
0 are collected, and the point A of the test piece 40 farthest from the ladle 44, the point E of the test piece 40 closest to the ladle 44, and points A and E
The mold temperature of the mold main body at a portion corresponding to three points at point C, which is an intermediate point between the points, was measured.

(Experimental Results) First, the average mold temperature at each of the above measurement points of the mold body measured in the above Examples and Comparative Examples was obtained, and the measurement results are shown in FIG. As is apparent from FIG. 12, in the comparative example in which casting was always performed using the right-side ladle 44 in the figure, the mold temperature at the point E closest to the ladle 44 was the highest, and A was the furthest from the pool.
The mold temperature at the spot is lowest.

On the other hand, in the embodiment in which the ladles 43, 44 on both sides are alternately used for each shot, casting is performed at 17 ° C. at the point E closest to the ladles 44 with respect to the comparative example. At point B, the 10 ° C. mold temperature has dropped. At the point A farthest from the ladle 44, the mold temperature of the embodiment is higher by 1 ° C. than that of the comparative example, and the mold temperature of each part of the mold body in the embodiment is leveled as a whole. You can see that.

Next, portions corresponding to five places between the points A and E of each of the six test pieces 40 obtained in the above Examples and Comparative Examples were cut out, and after polishing, were appropriately corroded. Observing the cross section with a microscope, the dendrite arm spacing of each test piece 40 was estimated in order to estimate the cooling rate in each part of the casting.
ng) is shown in FIG. Here, the dendrite arm spacing is an interval between secondary branches of dendritic crystals in a cast product, and is a center-to-center distance between adjacent secondary arms. That is, the dendrite 2 on the observation surface
Select a plurality of parts where the next arm is three or more aligned, measure the distance from the boundary of the arm group to the boundary, the number of intersections with the arm boundary when drawing a line from the boundary of the arm group to the boundary,
The average interval between the arms is obtained from these measured values. The number of branches of the dendrite to be measured was 30.

Further, the cooling rates at the five points from the point A to the point E of the test piece estimated from the measurement results of the dendrite arm spacing were obtained, and are shown in FIG. 13 and 14, the dendrite arm spacing in each part of the test piece is smaller and the cooling rate is higher in the test piece of the example than in the test piece of the comparative example. It is clear that the fineness of is achieved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view schematically showing a structure of an embodiment of a vehicle wheel casting apparatus according to the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing a state in which molten metal is supplied to one ladle of the casting apparatus shown in FIG.

FIG. 3 is a schematic cross-sectional view schematically showing a state in which a molten metal is poured from a ladle into a cavity by gradually tilting a mold body shown in FIG.

FIG. 4 is a schematic cross-sectional view schematically showing a mold opening state of the mold main body shown in FIG.

FIG. 5 is a schematic cross-sectional view schematically showing a state where molten metal is supplied to the other ladle of the casting apparatus shown in FIG.

6 is a schematic cross-sectional view schematically showing a state in which the molten metal is poured from a ladle into a cavity by gradually tilting the mold body shown in FIG.

FIG. 7 is a schematic cross-sectional view schematically showing a structure of a conventional vehicle wheel casting apparatus.

8 is a schematic cross-sectional view schematically showing a state in which a molten metal is supplied to a ladle of the casting apparatus shown in FIG.

9 is a schematic cross-sectional view schematically showing a state in which the molten metal is poured from the ladle into the cavity by gradually tilting the mold body shown in FIG.

FIG. 10 is a schematic cross-sectional view schematically showing a mold opening state of the mold main body shown in FIG.

FIG. 11 is a front view and a cross-sectional view showing the shape of a test piece in the example.

FIG. 12 is a graph showing the mold temperature of each part of the mold main body in the example.

FIG. 13 is a graph showing a measurement result of dendrite arm spacing in each part of the test piece in the example.

FIG. 14 is a graph showing a cooling rate in each part of the test piece in the example.

[Explanation of symbols]

 Reference Signs List 20 casting device 22 drive shaft 23 swing base 24 lower die 25 horizontal die 26 upper die 27 cavity 27a disk forming space 27b outer rim forming space 27c inner rim forming space 28 recess for hot water 29 first gate 30 Second gate 31 First ladle 32 Second ladle 33 Mold body

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B60B 3/02 B60B 3/02 3/06 3/06 (72) Inventor Hirohisa Abe 318 Aoicho, Hamamatsu-shi, Shizuoka Pref. In-company (72) Inventor Shiraku ▲ Yanagi ▼ Naomi 318 Aoi-cho, Hamamatsu-shi, Shizuoka Prefecture In-house Company (56) References JP-A-7-236965 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 25/02 B22C 9/08 B22C 9/28 B22D 23/00 B22D 27/08 B22D 33/02

Claims (2)

(57) [Claims] 1. A sprue is communicated with a feeder provided above a rim flange forming space of a mold cavity, and a ladle-shaped pool is provided near an entrance of the spout, and molten metal is poured into the pool. A vehicle in which a molten metal is poured into the basin after the mold is tilted, and then the molten metal is poured into the mold cavity by returning the mold horizontally, thereby integrally forming a vehicle wheel having a disk portion and a rim portion. A casting method of a wheel for use, wherein at least a pair of feeder portions provided with the gate and the basin portion are disposed above the rim flange forming space portion so as to face each other across a center axis of the wheel. ,
A casting method for a vehicle wheel, wherein the vehicle wheel is continuously and integrally formed by pouring a molten metal from each pool portion alternately for each shot. 2. A mold body for integrally molding a vehicle wheel having a disk portion and a rim portion is disposed at equal intervals along a peripheral edge of the rim flange molding space above a rim flange molding space of a mold cavity. And multiple hot water parts,
A plurality of spouts respectively communicated with at least a pair of the sprue portions opposing each other with the center axis of the wheel interposed therebetween, and a ladle-shaped poolhole provided near the entrance of each spout, and A casting apparatus for a vehicle wheel, comprising mold tilting means for alternately tilting the mold body in both directions for each shot with the center axis of the wheel interposed therebetween so as to pour molten metal into each of the pools.