JP4067249B2 - Aluminum wheel forming method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method having a swing forging process for an aluminum wheel for automobiles, and a molding apparatus directly used for carrying out the method.
[0002]
[Prior art]
Conventionally, an aluminum wheel may be formed by swing forging the disk portion. In that molding, the aluminum wheel material is molded by casting, the disk equivalent part of the aluminum wheel material is rock-forged and formed into the disk part of the aluminum wheel, and then the rim equivalent part of the aluminum wheel material is spun to make the aluminum wheel The surface of the aluminum wheel to be cut is cut.
In the conventional swing forging of the disk equivalent portion of the aluminum wheel material, as shown in FIG. 5, the fixed die 11 and the swing die 12 swinging relative to the fixed die 11 are equivalent to the disk of the aluminum wheel material 1. Part 2 is rock-forged.
In oscillating forging, the axis of the oscillating mold 12 is tilted with respect to the axis of the fixed mold 11 and rotates around the axis of the fixed mold 11, and the oscillating mold 12 is rotated around the axis of the oscillating mold 12. Does not rotate. In the swing forging, a part of the work (the disk equivalent part 2 of the aluminum wheel blank 1) is forged in the circumferential direction, and the forged part is sequentially moved in the circumferential direction by the swing of the swing die 12, so that the entire circumference Forging is performed throughout. Therefore, there is an advantage that the forming force is smaller than that of press forging in which the entire circumference is simultaneously forged.
[0003]
[Problems to be solved by the invention]
However, the conventional molding of an aluminum wheel material by swing forging has the following problems.
In other words, the axially symmetric shape is not a big problem. However, in a three-dimensional shape workpiece such as the aluminum wheel material 1, as shown in FIG. 6, the portion 3 having a flesh (for example, the spoke portion) is extended in the radial direction. However, the portion 4 having no meat (for example, a decorative hole) is not stretched in the radial direction, resulting in an irregular shape. In the case of the spoke type or the like, an n-gonal deformation corresponding to the number of spokes is generated, and the rim portion is also deformed accordingly. Therefore, a correction process has been required to produce a product.
The objective of this invention is providing the shaping | molding method and apparatus of an aluminum wheel which can suppress the distorted shaping | molding in rocking forging.
[0004]
[Means for Solving the Problems]
The present invention for achieving the above object is as follows.
(1) In the forming method of an aluminum wheel having a step of the disk corresponding portion of the aluminum wheel material swing forging to shaping the disc portion of the aluminum wheel,
A horizontal type is provided radially outward of the disk equivalent part of the aluminum wheel material, and the horizontal type is closely attached to the flange part and the bead seat part from the disk equivalent part of the aluminum wheel material from the radially outer side, and is equivalent to the disk of the aluminum wheel material. The outer peripheral part of the disk equivalent part of the aluminum wheel material is constrained in the wheel radial direction and the wheel axial direction in a horizontal type by closely contacting the side wall part of the part in the axial direction ,
The rim equivalent part of the aluminum wheel material is rocked and forged between the horizontal mold and the rocking mold, and the disk equivalent part of the aluminum wheel material is rocked and forged between the fixed mold and the rocking mold. Aluminum wheel forming method.
(2) Fixed type ,
Provided radially outwardly of the disk corresponding portion of the A Rumi wheel material, the flange portion of the disc corresponding portion of the aluminum wheel material, while being in close contact from the outer peripheral side in the radial direction in the bead seat portion, the disc portion corresponding to the aluminum wheel material A horizontal type that is closely attached to the sidewall portion in the axial direction and restrains the outer peripheral portion of the disk equivalent portion of the aluminum wheel material in the wheel radial direction and the wheel axial direction ,
Swing that swings and oscillates between the fixed mold and the horizontal mold, and swings and forges the disk equivalent part of the aluminum wheel material between the fixed mold and the forging machine. Dynamic type,
An aluminum wheel forming apparatus having
[0005]
In the aluminum wheel molding method of (1) and the aluminum wheel molding apparatus of (2), the outer peripheral portion of the disk equivalent portion of the aluminum wheel material is restrained in the radial direction in the horizontal shape during swing forging. It is suppressed that a certain part (for example, spoke part) is extended in the radial direction. As a result, the distorted forming in the swing forging is suppressed, and the step of correcting the distorted deformation that has been necessary in the prior art becomes unnecessary.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an aluminum wheel forming apparatus according to an embodiment of the present invention used for carrying out an aluminum wheel forming method according to an embodiment of the present invention, and FIG. 2 shows an aluminum wheel manufactured by the method and apparatus of FIG. FIG. 3 shows the measured shape dimensions of each part of the aluminum wheel material after rocking forging formed by the method implemented using the aluminum wheel forming apparatus of the embodiment of the present invention. These show the cross-sectional shape of the workpiece at each stage of all the steps of the aluminum wheel forming method including the aluminum wheel forming method of the embodiment of the present invention in some steps.
[0007]
First, an aluminum wheel forming apparatus according to an embodiment of the present invention will be described with reference to FIG.
An aluminum wheel molding apparatus according to an embodiment of the present invention includes a fixed die 11, a swing die 12 that swings with respect to the fixed die 11, and an outer peripheral portion of a disk-corresponding portion 2 of the aluminum wheel material 1 in the wheel radial direction. And a horizontal mold 13. In the illustrated example, the fixed mold 11 is a lower mold and the swing mold 12 is an upper mold. However, the arrangement is not limited thereto, and the fixed mold and the swing mold may be disposed upside down. Or you may arrange | position in a horizontal direction. The axis of the oscillating die 12 is inclined with respect to the axis of the fixed die 11, and the axis of the oscillating die 12 rotates around the axis of the fixed die 11. However, the swing mold 12 does not rotate around the axis of the swing mold 12.
The horizontal mold 13 is a mold in which a mold divided into a plurality in the wheel circumferential direction is arranged so as to be continuous in the wheel circumferential direction. Desirably, the horizontal mold 13 restrains the outer peripheral portion of the disk equivalent portion 2 in the wheel radial direction and also restricts the outer peripheral portion of the disk equivalent portion 2 in the wheel axial direction.
In the case of the illustrated example, when the horizontal mold 13 restrains the outer peripheral part of the disk equivalent part 2, the horizontal mold 13 restrains the flange part 2 a and the bead sheet part 2 b of the disk equivalent part 2 from the outer peripheral side in the radial direction. The sidewall portion 2c is closely attached and restrained from the upper side in the axial direction.
[0008]
The horizontal mold 13 is disposed between the fixed mold 11 and the swing mold 12 and is restrained relatively to the fixed mold 11. In the illustrated example, the restraint is performed by disposing a backup ring 14 on the outer peripheral side of the horizontal mold 13 to constrain the horizontal mold 13 in the radial direction from the outer peripheral side, and fixing the backup ring 14 in the wheel radial direction and axial direction with bolts or the like. This is done by fixing to 11. However, the fixing to the fixing side 11 may not be performed.
The restraint of the horizontal mold 13 to the fixed mold 11 is not limited to the illustrated example, but the horizontal mold 13 may be constrained by a hydraulic cylinder, or the horizontal mold 13 is fixed at the heel portion by attaching a collar. 11 may be fixed in the radial direction and the vertical direction.
[0009]
Next, a method for forming an aluminum wheel according to the embodiment of the present invention will be described.
As shown in FIG. 4, the method for forming an aluminum wheel according to the embodiment of the present invention includes a step of casting an aluminum wheel material 1 (portion indicated by a thick solid line in FIG. 4) by casting, and a disk equivalent portion of the aluminum wheel material 1. 2 is formed by swinging and forging into a disk portion 2 ′ of an aluminum wheel 1 ′ (forming into a disk portion 2 ′ indicated by a two-dot chain line and a thick solid line in FIG. 4), and then a rim of the aluminum wheel material 1 Spinning the corresponding portion 5 to form the rim portion 5 ′ of the aluminum wheel 1 ′ (forming the rim portion indicated by the two-dot chain line in FIG. 4), and then cutting the surface of the aluminum wheel to be cut (Cutting into a disk portion 2 ″ and a rim portion 5 ″ shown by thin solid lines in FIG. 4).
[0010]
The method for forming an aluminum wheel according to the embodiment of the present invention is a method related to the step of forming the disk portion 2 ′ of the aluminum wheel 1 ′ by swing-forging the disk equivalent portion 2 of the aluminum wheel material 1 among the above steps. It is. In the method for forming an aluminum wheel according to the embodiment of the present invention, as shown in FIG. 1, swing forging is executed by constraining the outer peripheral portion of the disk-corresponding portion 2 of the aluminum wheel blank 1 in the radial direction of the wheel with a horizontal die 13. In the aluminum wheel forming method of the embodiment of the present invention, desirably, as shown in FIG. 1, the outer peripheral portion of the disk equivalent portion 2 of the aluminum wheel blank 1 is restrained in the wheel radial direction and the axial direction by the horizontal die 13 and shaken. Perform dynamic forging.
[0011]
Next, the operation of the aluminum wheel molding method and apparatus according to the embodiment of the present invention will be described with reference to FIGS.
Since the outer peripheral portion of the disk equivalent portion 2 of the aluminum wheel blank 1 is restrained in the radial direction of the wheel by the horizontal die 13, the swing forging is executed. Even if the spoke portion is extended in the radial direction, the deformation from the outside to the outer peripheral side is restrained by the horizontal mold 13, so that the meat portion 3 is suppressed from extending in the wheel radial direction. In addition, if the portion 3 with the meat extends in the radial direction, the portion 4 with no meat (for example, a decorative hole) is pulled in the circumferential direction to try to become a straight line and tries to shrink in the radial direction of the wheel. Since the portion 3 with meat does not extend in the radial direction, the shrinkage of the portion 4 without meat in the radial direction of the wheel is also suppressed. As a result, the outer peripheral portion of the disk-corresponding portion 2 of the aluminum wheel material 1 can maintain a relatively good circular shape during swing forging, and an n-square shape corresponding to the number of spokes as shown in FIG. There is no deformation. As a result, the correction process from the n-gonal shape to the circular shape, which has conventionally been necessary after the swing forging, becomes unnecessary, and the number of steps is reduced.
[0012]
Moreover, when the outer peripheral part of the disk equivalent part 2 of the aluminum wheel material 1 is also restrained in the wheel axis direction by the horizontal mold 13, it is possible to suppress the deformation of the outer peripheral part of the disk equivalent part 2 in the wheel axis direction during swing forging, The amount of cutting in the wheel axis direction in the cutting process can also be reduced.
[0013]
FIG. 3 shows the method of the embodiment of the present invention implemented using the apparatus of the embodiment of the present invention, which corresponds to the disc portion 2 of the aluminum wheel '1 and the rim portion of the aluminum wheel material 1 after the swing forging and before the spinning process. The shape dimension data of the integrated object with 5 is shown. A is the axial dimension of the outer peripheral part including both the disk part 2 ′ and the rim equivalent part 5, B is the radius of the inner peripheral surface of the rim equivalent part 5, C is the radius of the outer peripheral part of the sidewall part 2c, The distribution of dimensions A, B and C (distribution over 360 °) is shown and shown. In the distribution diagram, a broken line is a perfect circle design value, and a solid line is a measured value. For dimension A, the distribution is expanded in the range of 80 to 95 mm, and for dimensions B and C, the distribution is expanded in the range of 150 to 165 mm. These changes in distribution are about 1/10 of the conventional distribution change (when there is no constraint by the horizontal type), indicating that the horizontal type 13 suppresses deformation.
[0014]
【The invention's effect】
According to the method for forming an aluminum wheel of claim 1, since the outer peripheral portion of the disk equivalent portion of the aluminum wheel material is restrained in the radial direction in the horizontal direction during the swing forging, a portion with a flesh (for example, a spoke portion) is formed. Stretching in the radial direction is suppressed. As a result, the distorted forming in the swing forging can be suppressed, and the step of correcting the distorted deformation that has been conventionally required can be eliminated.
According to the aluminum wheel forming apparatus of the second aspect, the outer peripheral portion of the disk equivalent portion of the aluminum wheel material is restrained in the radial direction in the horizontal direction during the swing forging, so that a portion with a flesh (for example, a spoke portion) is formed. Stretching in the radial direction is suppressed. As a result, the distorted forming in the swing forging can be suppressed, and the step of correcting the distorted deformation that has been conventionally required can be eliminated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an aluminum wheel forming apparatus according to an embodiment of the present invention (an apparatus that is performing an aluminum wheel forming method according to an embodiment of the present invention).
FIG. 2 is a front view of an aluminum wheel that has been formed using the aluminum wheel forming apparatus of the embodiment of the present invention (formed by the method of forming an aluminum wheel of the embodiment of the present invention) and that has been subjected to swing forging.
FIG. 3 is a deformation distribution diagram of each part of an aluminum wheel that has been formed using the aluminum wheel forming apparatus of the embodiment of the present invention (formed by the method of forming an aluminum wheel of the embodiment of the present invention) and that has been subjected to swing forging. .
FIG. 4 is a cross-sectional view of an aluminum wheel material or an aluminum wheel at each step of the method for forming an aluminum wheel according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a conventional aluminum wheel swing forging device (a device that is performing conventional swing forging).
FIG. 6 is a front view of an aluminum wheel formed by using a conventional aluminum wheel swing forging device (formed by a conventional aluminum wheel swing forging method) after swing forging.
[Explanation of sign]
DESCRIPTION OF SYMBOLS 1 Aluminum wheel material 1 'Aluminum wheel 2 Aluminum wheel material disk equivalent part 2 Aluminum wheel disk part 2a Disk equivalent part or disk part flange part 2b Disk equivalent part or bead sheet part 2c of disk part Disk equivalent part or disk part Side wall part 3 Thick part 4 Thick part 5 Aluminum wheel material rim equivalent part 5 'Aluminum wheel rim part 11 Fixed type 12 Swing type 13 Horizontal type 14 Backup ring

Claims (2)

In an aluminum wheel molding method including a step of forming a disk part of an aluminum wheel by swinging and forging a disk equivalent part of the aluminum wheel material,
A horizontal type is provided radially outward of the disk equivalent part of the aluminum wheel material, and the horizontal type is closely attached to the flange part and the bead seat part from the disk equivalent part of the aluminum wheel material from the radially outer side, and is equivalent to the disk of the aluminum wheel material. The outer peripheral part of the disk equivalent part of the aluminum wheel material is constrained in the wheel radial direction and the wheel axial direction in a horizontal type by closely contacting the side wall part of the part in the axial direction ,
The rim equivalent part of the aluminum wheel material is rocked and forged between the horizontal mold and the rocking mold, and the disk equivalent part of the aluminum wheel material is rocked and forged between the fixed mold and the rocking mold. Aluminum wheel forming method. Fixed type,
It is provided on the outer side in the radial direction of the disk equivalent part of the aluminum wheel material, and is closely attached to the flange part and the bead seat part from the outer side in the radial direction of the disk equivalent part of the aluminum wheel material. Of these, the horizontal type that is closely attached to the sidewall portion in the axial direction and restrains the outer peripheral portion of the disk equivalent portion of the aluminum wheel material in the wheel radial direction and the wheel axial direction ,
Swing that swings and oscillates between the fixed mold and the horizontal mold, and swings and forges the disk equivalent part of the aluminum wheel material between the fixed mold and the forging machine. Dynamic type,
An aluminum wheel forming apparatus having

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