JP2787171B2 - Spinning molding method for vehicle wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning method for a vehicle wheel in which a disk portion is continuously provided near a front rim flange portion.

[0002]

2. Description of the Related Art In a conventional spinning method of this type, both front and rear bead seat portions, a rear rim flange portion, and a well intermediate material portion of a rim portion are formed by first spinning a wheel material. After that, when performing the second spinning molding, an extra space is provided between the molding die and the well intermediate material portion and the front side bead seat portion of the wheel material after the first spinning molding, and in this state, the well intermediate portion is formed. By forming the well portion in the rim portion by subjecting the material portion to the second spinning molding along the mold (US Pat. No. 4,5,5).
No. 28,734), this type of vehicle wheel in which the back side of the front bead seat portion is curved without using nests has been manufactured.

[0003]

However, in such a conventional spinning method for a vehicle wheel, when the second spinning is performed, a well intermediate material portion of the wheel material (after the first spinning) is formed. Despite providing an extra space between the mandrel and the mandrel, the wheel material is merely fitted outside the mandrel, so when spinning the well intermediate material portion,
The disk portion is distorted in the direction of the rear rim flange portion, and a gap is formed between the tailstock and the disk portion, and as a result, it is difficult to manufacture an appropriate vehicle wheel.

An object of the present invention is to eliminate such inconvenience.

[0005]

In order to achieve the above object, a spinning method for a vehicle wheel according to the present invention comprises the steps of: spinning a wheel for a vehicle having a disk portion continuously provided near a front rim flange portion. In

A first spinning molding of the wheel material forms both front and rear bead seat portions, a rear rim flange portion, and a well intermediate material portion of the rim portion,
After that, when performing the second spinning molding, a spare space is provided between the molding die and the well intermediate material portion and the front side bead seat portion of the wheel material after the first spinning molding, and in this state, the well intermediate material portion is formed. A spinning method for a vehicle wheel in which a well portion in a rim portion is formed by spinning along the forming die, wherein the back side rim flange portion is locked to the forming die during the second spinning forming. It is.

[0007]

The spinning method for a vehicle wheel according to the present invention is configured as described above, that is, the back side of the wheel material (after the first spinning forming) is placed in the forming die when performing the second spinning forming. Since the rim flange is locked, the disc is less likely to be distorted in the direction of the rear rim flange when the well is formed in the second spinning molding.

[0008]

1 and 2 show a first spinning step.

In FIG. 1, reference numeral 1 denotes a first spinning molding mandrel (hereinafter, referred to as “first mandrel”);
Can rotate around the axis. Reference numeral 11 denotes a molding surface of the mandrel 1. The molding surface 111 of the front bead seat portion, the molding surface 112 of the well intermediate material portion, and the molding surface 11 of the back bead sheet portion.
3 is comprised.

Reference numeral 2 denotes a cast (or forged) wheel material, which comprises a disk portion 21 and a cylindrical rim material portion 22 integrally formed on the periphery of the disk portion 21. Reference numeral 211 denotes a front side rim flange portion integrally formed with the disk portion 21. The wheel material 2 is clamped and fixed to the end surface of the first mandrel 1 by the tailstock 3 in a state where the rim material portion 22 is fitted on the molding surface 11 of the first mandrel 1.

In this state (the state of FIG. 1), the first mandrel 1 is rotated around the axis, and as shown in FIG.
Rim material portion 2 of wheel material 2 by pressing roller 4
2 along the forming surface 11 of the first mandrel 1 (in the direction of the arrow), the front bead seat portion 511, the well intermediate material portion 5
12, a rear bead seat portion 513 and a rear rim flange portion 514 are formed. The wheel material on which the front bead seat portion 511, the well intermediate material portion 512, the back bead seat portion 513, and the back rim flange portion 514 are formed is hereinafter referred to as a wheel intermediate material 5 for convenience of explanation.

Next, FIGS. 3 and 4 show the second spinning step.

In FIG. 3, reference numeral 6 denotes a second spinning molding mandrel (hereinafter referred to as "second mandrel").
Can rotate around the axis. Reference numeral 611 denotes a rear rim flange locking step, and 612 denotes a rear bead seat portion support surface, which are formed on the second mandrel 6, respectively. next,
Reference numeral 613 denotes a well forming surface, which is connected to the back bead seat portion supporting surface 612 of the second mandrel 6. The rear rim flange locking step 611, the rear bead seat support surface 612, and the well forming surface 61
Function 3 will be described later. Reference numeral 614 denotes a continuous surface, which is continuous with the well forming surface 613 in the second mandrel 6. The connecting surface 614 is provided to enable the second mandrel 6 to be pulled out.

The wheel intermediate member 5 is clamped and fixed to the end face of the second mandrel 6 thus configured by the tail stock 7 (see FIG. 3). At this time, wheel intermediate material 5
The rear rim flange portion 514 of the second mandrel 6
And the rear bead seat portion 513 is supported by the back bead seat portion support surface 612. Further, the well intermediate material portion 512 of the wheel intermediate material 5 and the front side bead seat portion 51
An extra space S is interposed between the first mandrel 6 and the well forming surface 613 and the connecting surface 614 of the second mandrel 6.

In this state (the state shown in FIG. 3), the second mandrel 6 is rotated around the axis, and as shown in FIG.
When the wheel intermediate member 5 is handled along the well forming surface 613 of the second mandrel 6 by the pressing roller 8 (in the direction of the arrow), the well 52 and thus the wheel W are formed.
At this time, the connecting surface 614 and the front bead seat portion 5
The distance from the reference numeral 11 hardly changes.

[0016]

The spinning method for a vehicle wheel according to the present invention is a method for spinning a vehicle wheel having a disk portion connected to the vicinity of a front side rim flange portion, wherein the wheel material is first spinned. By forming the front and back bead seat portions, the back side rim flange portion, and the well intermediate material portion in the rim portion, and then performing the second spinning molding, the well intermediate material portion of the wheel material after the first spinning molding And an extra space is provided between the front bead seat portion and the molding die,
In this state, in the spinning method of a vehicle wheel for forming a well portion in a rim portion by spinning the well intermediate material portion along the forming die, the second spinning forming includes forming the well into the forming die. Because the rear rim flange was locked, that is, the rear rim flange of the wheel material (after the first spinning was formed) was locked to the forming die in performing the second spinning, the well was formed in the second spinning. When forming the disk, the disk portion is unlikely to be distorted in the direction of the rear rim flange.

Therefore, if this spinning molding method is used, the vehicle wheel having the disk portion continuously connected to the vicinity of the front side rim flange portion can be properly mounted without using a child by entering a state where the back surface of the front side bead seat portion is curved. Spinning can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first spinning step of the present invention.

FIG. 2 is a sectional view showing a first spinning step of the present invention.

FIG. 3 is a sectional view showing a second spinning step of the present invention.

FIG. 4 is a sectional view showing a second spinning step of the present invention.

[Explanation of symbols]

2 wheel material 21 disk part 211 front rim flange part 511 front bead seat part 512 well intermediate material part 513 back bead seat part 514 back rim flange part 52 well part 6 second mandrel (molding mold) ) S ... extra space W ... wheel for vehicle

Claims (1)

(57) [Claims] 1. A method for spinning a vehicle wheel having a disk portion adjacent to a front side rim flange portion, wherein both front and rear bead seat portions of the rim portion are formed by first spinning a wheel material. Forming the back side rim flange portion and the well intermediate material portion, and then performing the second spinning molding, between the well intermediate material portion and the front bead seat portion of the wheel material after the first spinning molding and the molding die. An extra space is provided, and in this state, in the spinning molding method of a vehicle wheel for forming a well portion in a rim portion by spinning the well intermediate material portion along the molding die, the second spinning molding is performed. The spinning of a vehicle wheel, wherein the back side rim flange portion is locked to the molding die. Molding method.