JPH07299556A - Method and device for casting of wheel for vehicle - Google Patents

Abstract

PURPOSE:To provide the method and device for casting a wheel for vehicle while suppressing generation of casting defect and improving production efficiency, capable of continuous forming a high quality integrated wheel for vehicle. CONSTITUTION:The mold main body 33 to form an integrated wheel for vehicle is provided with a recessed part 28 for plural risers placed in the upper part of rim flange forming space part of a cavity 27 at equal interval along the periphery of rim flange forming space part, a pair of sprues 29, 30 respectively communicating to the recessed part 28 for a pair of riser facing each other across the center axis of wheel and a first ladle, second ladle 31, 32. The mold main body 33 is placed on an oscillating base board 23 supported with a drive shaft 22, the first and second ladle 31, 32 are alternately both direction tilted at every shot across the center axis of wheel in order to alternately pour molten metal, a wheel for vehicle is continuously cast.

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 wheel for a vehicle, and more particularly to a method for casting a wheel for a vehicle which continuously and integrally forms a wheel for a vehicle having a disc portion and a rim portion by a gravity casting method. Regarding improvement of casting equipment.

[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 often used for a current automobile wheel. Such a light alloy wheel has various structures such as a one-piece wheel, a two-piece wheel, and a three-piece wheel, and there are various methods for forming rims and discs constituting the wheel.

In particular, a gravity casting method is widely used as a casting method for a one-piece wheel for integrally molding a disc portion and a rim portion, but this gravity casting method is another casting method.
For example, compared with the low-pressure casting method, the die casting method, etc., it has an advantage that the structure of the casting mold and casting equipment used for casting is simple and the light alloy wheel can be cast at a low cost.

However, in the conventional gravity casting method, when pouring the molten metal from the sprue, the air in the mold cavity is easily caught in the molten metal, so that the position and size of the sprue are selected incorrectly, and the molten metal is quiet. If it does not flow into the mold, there is a problem that the cast light alloy wheel is likely to cause casting defects such as blow holes. Therefore, in order to prevent the entrainment of air as described above, the runners are usually provided in the mold for gently pouring the molten metal into the mold cavity through the coughs. While increasing the amount, it remains in the casting as a sprue mark even after casting. Therefore, there is a problem that an excessive amount of casting material is required at the time of casting, and it takes time to remove and finish these sprue marks.

The inventors of the present invention have conducted extensive studies to improve the above-mentioned problems of the gravity casting method, and as a result, entrap air when pouring the molten metal into the mold cavity without providing a runner in the mold. We have developed a vehicle wheel casting method that can prevent this. First, the casting apparatus 1 used in the above casting method for integrally molding a vehicle wheel will be described with reference to FIG. 7. The casting apparatus 1 is rotatably supported by a drive shaft 2 that extends in a horizontal direction (a direction vertical to the plane of the drawing), and swings between a horizontal state and a state in which the swinging state swings clockwise in the drawing and is tilted. Free swing base 3
It has a mold body 13 placed and fixed on top.

The mold body 13 is slidable in a horizontal direction with a lower die 4 fixed on the swing base 3, an upper die 6 which can be raised and lowered with respect to the lower die 4. It is configured by combining a plurality of horizontal molds 5. The cavity 7 formed in the mold body 13 has a disk molding space 7a forming the disk part of the wheel and an outer rim molding space 7b forming the outer rim at the lower part of the mold, and the inner rim part. The inner rim molding space 7c that forms the space is arranged 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 4 corresponding to the disk molding space 7a molds the design surface of the wheel disk portion, and the upper mold 6 molds the hub mounting surface of the wheel disk portion.

The inner rim molding space 7c
Above the rim flange forming space which is the upper edge of the rim flange, there are formed a plurality of recesses 8 for the riser arranged at equal intervals along the periphery of the rim flange forming space. A recess 12 for the riser is formed in a portion that coincides with the center of the portion 7a. Further, when the mold body 13 is tilted by swinging around the drive shaft 2 in the clockwise direction in the drawing, a push formed to face the lowermost part of the inner rim molding space 7c. A ladle 10 which is a ladle-shaped pool of water is attached above the recess 8 for hot water, and a spout 9 is formed so as to communicate with the ladle 10 and open upward of the mold body 13.

The ladle 10 receives the molten metal when the mold body 13 is tilted, and as the mold body 13 is gradually returned from the tilted state to the horizontal state, the molten metal is passed through the spout 9 to the cavity 7 It is a hot water pool configured so that it can be poured inside the. Next, a method for casting a vehicle wheel using the above casting apparatus 1 will be described with reference to FIGS. 8 to 10.

First, as shown in FIG. 8, the drive shaft 2 is rotated to tilt 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 poured 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 therein gradually flows into the cavity 7 through the sprue 9. Then, after the molten metal 14 is cooled and solidified, FIG.
By opening the mold body 13 as shown in, the casting product 15 of the vehicle wheel is taken out to complete the casting process.

In the above-described method for casting a vehicle wheel, the pouring speed of the molten metal 14 into the cavity 7 can be appropriately controlled according to the rotational speed of the drive shaft 2 for returning the mold body 13 from the tilted 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 tilt angle in the cavity 7, and the molten metal 14 can gradually enter below the air existing inside the cavity 7. Therefore, the molten metal 14 poured into the cavity 7 is less likely to entrain air, and casting defects due to entraining air are less likely to occur in the cast vehicle wheel.
Therefore, since the molten metal is gently poured into the mold cavity, it is not necessary to provide a mold with a runner as in the conventional case.

Further, by providing the sprue 9 above the recess 8 for the riser, it is possible to make the riser portion 15a of the casting to be finally solidified coincide with the sprue of the casting to be finally solidified. The sprue part, which is most likely to be solidified and whose strength is lowered, is not cut along with the riser part 15a and remains in the product part. Furthermore, the trace of the sprue that does not have a runway trace 15
Since b is also removed by cutting the riser portion 15a, there is no need for extra processing for cutting the sprue mark 15b in the subsequent machining process, and the time required for finishing can be shortened. Have.

[0012]

However, in the method for casting a vehicle wheel using the casting mold apparatus 1 described above, since the sprue 9 is provided at one place, the mold temperature near the sprue 9 becomes high. On the other hand, the mold temperature of the portion located on the opposite side of the spout 9 across 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 in the portion close to the sprue 9 is high and the cast metal structure of the wheel to be cast tends to be coarse, and the strength tends to be lowered, while the temperature of the molten metal is in the portion opposite to the sprue 9. Since it is easy to obtain sufficient strength due to a decrease in the strength, a portion having high strength and a portion having low strength are mixed in the rim portion of one vehicle wheel, which is not preferable in terms of its characteristics as a vehicle wheel that is a rotating body. Become.
Also, casting defects such as shrinkage cavities due to shrinkage during solidification at the casting part where the mold temperature is high and solidification at the end, and blowholes where gas in the molten metal remains inside the casting where the mold temperature is low and the outer circumference of the casting is easy to solidify may occur. There is a nature.

Further, since the temperature of the molten metal in the vicinity of the sprue 9 becomes high, it takes a long time to cool and solidify, so that the cycle time required for one casting (one shot) becomes long and the production efficiency decreases. I will end up. Therefore, an object of the present invention is to solve the above problems, to suppress the occurrence of casting defects and increase the production efficiency, and a method for casting a vehicle wheel capable of continuously molding a good vehicle wheel integrally. It is to provide a casting device.

[0015]

The above object of the present invention is to make a sprue communicate with a riser portion disposed above a rim flange forming space of a mold cavity, and to provide a ladle-like pool in the vicinity of the entrance of the sprue. Is provided, the mold is tilted to pour the molten metal into the pool, the molten metal is poured into the pool, and then the mold is returned horizontally to pour the molten metal into the mold cavity, and the disc portion and the rim. A method of casting a vehicle wheel in which a vehicle wheel having a portion is integrally formed, wherein at least a pair of riser portions provided with the sprue and the basin are opposed to each other with a center axis of the wheel interposed therebetween. A vehicle wheel, which is disposed above the rim flange forming space, and in which molten metal is alternately poured from each of the pools for each shot to continuously integrally form a vehicle wheel. It is achieved by casting methods Eel.

[0016] Further, the above-mentioned object is that a mold body integrally molding a vehicle wheel having a disc portion and a rim portion is arranged at equal intervals along the peripheral edge of the rim flange molding space portion above the rim flange molding space portion of the mold cavity. Are provided in the vicinity of the entrances of the respective sprue parts, which are arranged in the And a mold tilting means for tilting the mold body alternately in both directions with the center axis of the wheel sandwiched therebetween in order to pour molten metal into each of the pools. Achieved by the featured vehicle wheel casting apparatus.

[0017]

According to the above method and apparatus for casting a wheel for a vehicle, the pouring 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, and Since the molten metal can be gradually poured from the pool into the lowermost part of the tilt angle in the cavity and gradually enter into the lower side of the air existing in the cavity, the molten metal is poured into the cavity. The molten metal becomes difficult to entrain air, and it is not necessary to provide a runner in the mold.

Further, by providing the gate above the feeder part, it is possible to make the cast metal part of the casting to be finally solidified and the gate of the cast metal to be solidified last, and to solidify the last and obtain the strongest strength. The sprue part that tends to decrease is not cut along with the riser part and remains in the product part, and the sprue mark is removed by cutting the riser part. Furthermore, a pair of sprues are arranged so as to face each other across the center of the mold body, each sprue is located at a position where the temperature of the molten metal poured from the facing spouts tends to decrease,
By pouring the molten metal alternately from these gates every shot, the parts with low mold temperature alternate around the gate with high mold temperature, leveling the temperature distribution of the mold body and lowering the temperature of the entire mold body. Faster cooling rate of castings.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle wheel casting method and casting apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. Here, FIG. 1 is a schematic cross-sectional view schematically showing the vehicle wheel casting apparatus of the present embodiment, and FIGS. 2 to 6 are schematic cross-sectional views for explaining the flow of the casting method according to the present embodiment. .

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

Then, the inner rim molding space 27 is formed.
Above the rim flange forming space, which is the upper end edge of c, there are formed a plurality of recesses 28 for the riser which are arranged at equal intervals along the periphery of the rim flange forming space. In the part that matches the center of the space 27a,
A recess 34 for the 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 drawing, it faces the lowermost part of the inner rim molding space 27c. The pair of ladle-shaped ladle 3 which is a pair of ladle-shaped basins facing each other across the center axis of the wheel is provided above the pair of recesses 28, 28 for hot water.
1, 32 are attached, and first and second sprues 29, 30 are formed so as to open upward of the mold body 33 so as to communicate with the first and second ladles 31, 32. That is, the first and second sprues 29, 30 are respectively communicated with a pair of the above-mentioned recesses 28, 28 for riser which face each other with the center axis of the wheel in between.

The first and second ladles 31, 32 are
The molten metal is received 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 as the mold body 33 is gradually returned to the horizontal state. Cavity 2 through 30
It is a pool of water that can be poured inside 7.

Next, a method of casting a vehicle wheel using the above casting apparatus 20 will be described with reference to FIGS. 2 to 6. 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 to keep the first ladle 31 substantially horizontal and to set the ladle inside the first ladle 31. The molten metal 14 is supplied from 11. Then, as shown in FIG. 3, when the mold body 33 is gradually rotated counterclockwise in the drawing 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 casting product 15 of the vehicle wheel is taken out to complete the first casting process.

Next, as shown in FIG. 1 again, the mold body 3
3, the drive shaft 22 is rotated to tilt the mold body 33 in the counterclockwise direction in the drawing to keep the second ladle 32 substantially horizontal, and to close the second ladle 32 as shown in FIG. The molten metal 14 is supplied from the ladle 11 into the ladle 32. Thereafter, as shown in FIG. 6, when the mold body 33 is gradually rotated clockwise from the tilted state to the horizontal state,
The molten metal 14 in the second ladle 32 gradually flows into the cavity 27 via the second gate 30. And molten metal 1
4 is cooled and solidified, the mold body 33
By opening, the casting product 15 of the vehicle wheel is taken out to complete the second casting process.

Then, the molten metal 14 is alternately poured from the first and second ladles 31 and 32 for each shot of pouring the molten metal 14 into the cavity 27 to continuously integrate the cast product 15 of the vehicle wheel. The first and second casting steps are alternately repeated for molding. At this time, the injection speed of the molten metal 14 into the cavity 27 can be appropriately controlled in accordance with the rotation speed of the drive shaft 22 that returns the mold body 33 from the tilted state to the horizontal state, and the molten metal 14 can be the first and the first, respectively. Since the molten metal 14 can be gradually poured from the two ladles 31 and 32 to the lowermost portion in the tilt angle in the cavity 27, and the molten metal 14 can gradually enter the lower side of the air existing in the cavity 27, Cavity 2
The molten metal 14 poured into 7 becomes difficult to entrap air,
A cast vehicle wheel is less likely to have a casting defect due to the inclusion of air. That is, it is possible to prevent entrapment of air when pouring the molten metal without providing the mold with a runway for gently pouring the molten metal into the mold cavity. There is no need to spend time and finishing.

Further, the pair of sprues 29, 30 are provided in the mold body 3
The gates 29 and 30 are arranged so as to face each other with the center of the gate 3 sandwiched therebetween, and since the temperature of the molten metal 14 poured from the gates 30 and 29 facing each other is easily lowered, these gates By alternately pouring the molten metal 14 every 29 shots from 29 and 30, the portion having the lower mold temperature is alternately turned around the gate having the higher mold temperature, and the mold body 33
The temperature distribution of the mold is leveled, the temperature of the entire mold is lowered, 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 that are likely to occur in the casting portion where the mold temperature is high and solidify at the end, and the mold temperature is low and the outer periphery of the casting is likely to solidify quickly. Casting defects such as blowholes that occur inside the casting are less likely to occur. In addition, the cooling speed of the wheel to be cast is increased, the cast structure is refined, and its strength can be increased. Therefore, not only can the wheel be made thinner and lighter, but 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 facing recesses 2 for the riser.
By providing the sprues 29, 30 above the 8, 28,
The molten metal part 15a of the casting to be finally solidified and the sprue metal of the casting to be solidified last can be made to coincide with each other, and the sprue part which is most likely to be solidified lastly and whose strength is lowered is the molten metal part 15
It is not cut along with a and remains on the product part. Furthermore,
A minute sprue mark 15b that does not have a runway trace also pushes the hot water part 15
Since it is removed by cutting a, there is an advantage that extra processing for cutting the sprue mark 15b is unnecessary in the machining in the subsequent step, and the time required for finishing can be shortened.

The casting apparatus for a vehicle wheel according to the present invention is not limited to the above-mentioned embodiment, but includes a mold structure such as an upper mold, a lower mold, a horizontal mold, etc. constituting the mold main body, and a pool of water and a riser. The shape and quantity of the parts can be variously changed. Further, in order to obtain a good quality casting, a chill, degassing, etc. are appropriately arranged as necessary. Further, in the casting apparatus 20 of the above-mentioned embodiment, a pair of ladles 11 are arranged on the left and right sides in the drawing in order to facilitate understanding of the casting method of the present invention.
Although an example in which the molten metal 14 is alternately supplied to the first and second ladles 31 and 32 has been shown, the swing base 23 is horizontally moved 180 degrees.
The mold body 33 can be rotated 180 degrees for each shot.
1 degree and 2nd alternately from one ladle 11
The molten metal 14 may be supplied to the ladles 31 and 32.

[0030]

According to the casting method and casting apparatus for a vehicle wheel of the present invention, the pouring 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 puddle portion to the lowermost part in the tilt angle in the cavity and can gradually enter the lower side of the air existing in the cavity, so that it is poured into the cavity. The molten metal to be heated becomes difficult to entrain air, and casting defects due to entrainment of air are unlikely to occur in the cast vehicle wheel. That is, it is possible to prevent entrapment of air when pouring the molten metal without providing the mold with a runway for gently pouring the molten metal into the mold cavity. There is no need to spend time and finishing.

Further, by providing the gate above the feeder part, the last part of the casting to be solidified can be made to coincide with the last gate of the casting to be solidified. The sprue part, which is apt to decrease, is not cut along with the riser part and remains in the product part, and the minute sprue mark having no runner mark is also removed by cutting the riser part. Therefore, it is possible to shorten the time required for the finishing process by eliminating the need for an extra process for cutting the sprue mark in the machining process in the subsequent process.

Further, a pair of gates are arranged so as to face each other with the center of the mold body sandwiched therebetween, and each gate is located at a position where the temperature of the molten metal poured from the facing gates tends to decrease. By alternately pouring the molten metal from these sprues for each shot, the parts with low mold temperature alternate around the sprue with high mold temperature, leveling the temperature distribution of the mold body and lowering the temperature of the entire mold body. And the cooling rate of the casting becomes faster.

Therefore, the strength of the rim portion of the vehicle wheel becomes uniform in the circumferential direction, and the shrinkage cavities that are likely to occur in the casting portion where the mold temperature is high and finally solidify, and the casting temperature is low and the outer periphery of the casting easily solidifies quickly. It becomes difficult for casting defects such as blow holes to occur inside the steel. In addition, since the cooling speed of the wheel to be cast is increased and the cast structure is refined and its strength can be increased, not only can the wheel be made thinner and lighter in weight, but also the weight of the cast metal can be reduced to produce it. 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 vehicle wheel casting method and casting apparatus capable of suppressing the occurrence of casting defects and improving the production efficiency, and continuously forming good vehicle wheels integrally.

[0035]

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

The material used for casting the test piece 40 is AC4C, the molten metal temperature is 740 ° C. ± 10 ° C., the mold body is preheated by a heater until the mold temperature reaches 300 ° C., and the solidification time is 90. Seconds, and the cycle time was 120 seconds. Then, set the ladle 44 and 43 on both sides to 1
Six test pieces 40 were cast by using the ladle 44 on the right side of the drawing after casting the test piece 40 continuously by alternately using each shot, and throwing it to a stable state. .

A point A of the test piece 40 which is the farthest position from the ladle 44 used for casting, an E point of the test piece 40 which is the closest position to the ladle 44,
And C of the test piece 40 which is an intermediate point between points A and E
The mold temperature of the mold body when the test piece 40 was sampled was measured at portions corresponding to three points. (Comparative Example) The mold body used in the above example is used as it is, but one-sided casting in which the ladle 44 on the right side in the drawing is always used for continuous casting, and the other casting conditions are the same as those in the above example And a test piece 4 having the same shape as the embodiment
6 pieces of 0 are collected, and the A point of the test piece 40 farthest from the ladle 44, the E point of the test piece 40 closest to the ladle 44, and the A point and the E point
The mold temperature of the mold main body at a portion corresponding to three points C, which is the midpoint of 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 determined, and the measurement results are shown in FIG. As is apparent from FIG. 12, in the comparative example in which casting is always performed using the ladle 44 on the right side of the drawing, the mold temperature at the point E closest to the ladle 44 is the highest, and A farthest from the pond is A.
The mold temperature of the spot is the lowest.

On the other hand, in the example in which the ladles 43 and 44 on both sides were alternately used for each shot, the casting was performed at 17 ° C. at the point E closest to the ladle 44, as compared with the comparative example. At the point B, the mold temperature has decreased by 10 ° C. At the point A farthest from the ladle 44, the mold temperature of the example is higher than that of the comparative example by 1 ° C., and as a whole, the mold temperatures of the respective parts of the mold body in the example are leveled. I understand.

Next, the six test pieces 40 obtained in each of the above-mentioned Examples and Comparative Examples were cut out at portions corresponding to five points between the points A and E, and after polishing, they were appropriately corroded. The cross section of each test piece 40 is observed with a microscope to estimate the cooling rate in each part of the cast product (dendrite arm spaci).
13 shows the result of measurement of ng). Here, the dendrite arm spacing is a secondary branch interval of dendrites in a cast product, and is a center-to-center distance between adjacent secondary arms. That is, 2 of dendrite on the observation surface
Select multiple parts where three or more next arms are aligned, measure the distance from the boundary of the arm group to the boundary, measure the number of intersections with the arm boundary when drawing a line from the boundary of the arm group to the boundary,
The average distance between the arms is calculated from these measured values. The number of dendrite branches measured was 30.

Further, the cooling rates of the five portions from the point A to the point E of the test piece estimated from the measurement result of the dendrite arm spacing described above were obtained and shown in FIG. Therefore, as is clear from FIGS. 13 and 14, in the test piece of the example, the dendrite arm spacing in each part of the test piece is narrower and the cooling rate is higher than that of the test piece of the comparative example. It is clear that the miniaturization of

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view schematically showing the structure of one embodiment of a vehicle wheel casting device according to the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing a state in which the 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 the mold body shown in FIG. 2 is gradually inclined and molten metal is poured into the cavity from the ladle.

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

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

FIG. 6 is a schematic cross-sectional view schematically showing a state in which the mold body shown in FIG. 5 is gradually tilted and molten metal is poured into the cavity from the ladle.

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

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

9 is a schematic cross-sectional view schematically showing a state in which the mold body shown in FIG. 8 is gradually tilted and molten metal is poured into the cavity from the ladle.

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

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

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

FIG. 13 is a graph showing the measurement results 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]

 20 Casting device 22 Drive shaft 23 Swing base 24 Lower mold 25 Horizontal mold 26 Upper mold 27 Cavity 27a Disk molding space 27b Outer rim molding space 27c Inner rim molding space 28 Recess for hot water 29 First gate 30 Second sprue 31 First ladle 32 Second ladle 33 Mold body

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B60B 3/02 3/06 (72) Inventor Hirohisa Abe 318 Aoi-cho, Hamamatsu-shi, Shizuoka Enkei Stock Company (72 ) Inventor Shiro yanagi ▼ Naomi Enkai Co., Ltd. 318 Aoicho, Hamamatsu City, Shizuoka Prefecture

Claims (2)

[Claims] 1. A pouring spout is provided in communication with a portion of a molten metal disposed above a rim flange forming space of a mold cavity, and a ladle-shaped pond is provided near an entrance of the spout, and molten metal is poured into the pond. A vehicle in which the molten metal is poured into the puddle portion, the molten metal is poured into the mold cavity by returning the mold horizontally, and a vehicle wheel having a disc portion and a rim portion is integrally formed. A method of casting a wheel for use, wherein at least a pair of riser parts provided with the sprue part and the pool part are arranged above the rim flange forming space part so as to face each other with the center axis of the wheel in between. ,
A method for casting a vehicle wheel, characterized in that the vehicle wheel is continuously integrally molded by pouring the molten metal alternately from each of the pools for each shot. 2. A mold main body for integrally molding a vehicle wheel having a disk portion and a rim portion is arranged at equal intervals above the rim flange molding space portion of the mold cavity along the periphery of the rim flange molding space portion. And multiple hot water parts,
A plurality of sprues that are respectively communicated with at least a pair of the riser parts that face each other across the center axis of the wheel, and a ladle-like hot water pool portion provided near the entrance of each sprue, and A casting device for a vehicle wheel, characterized by comprising mold tilting means for tilting the mold body alternately in both directions with the center axis of the wheel sandwiched therebetween in order to pour the molten metal into each of the pools.