JPS5932215B2 - Processing method and device for vehicle disc wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for shaping and processing a disc wheel for a vehicle, and an apparatus used to carry out the method.
In particular, a processing method and dedicated machine for shaping a vehicle disc wheel with high accuracy by correcting ellipticity and local deformation by spinning the rim bead seat part of a disc wheel, and correcting eccentricity with the disc hub hole. It is related to.

A vehicle disc wheel is manufactured by press-fitting a disc 2 into a rim 1 and applying spot welding or CO2 welding 4 to a drop part 3 of the rim 1 to join the rim 1 and disc 2, as shown in Fig. 1. be done.

Regarding the functions of each part, please refer to the bead seat parts 5 and 6 of the rim 1.
holds the tire, and the disc 2 is fixed to the vehicle hub with a nut. At this time, the hub hole T in the center portion of the disc 2 serves as a reference for attachment.

The precision required for the wheel is that the eccentricity of each of the rim bead seat parts 5 and 6 is small with respect to the hub hole 7. That is, the smaller the amount of eccentricity of the rim bead seat portions 5, 6, the better the running performance, and as the amount of eccentricity increases, the unbalance of the wheels increases, vibrations occur during driving, and the riding comfort becomes significantly worse. Accuracy inspection of vehicle disc wheels is carried out as shown in FIG. i.e. disk 2
is set on the rotary table 8 with the hub hole 7 as a reference, and the rim bead seat parts 5 and 6 are each inspected with different dial indicators 9 to read the eccentricity of the entire circumference and the amount of local deformation. The radial deformation of a disc wheel, that is, the vertical runout, is regarded as a characteristic value of wheel accuracy, and in practice, an accuracy of 0.7mm to 0.4mm or less is increasingly required. In addition to managing vertical runout, the disc wheel for a car is also managed with a dial indicator on the flange portion 10 to manage lateral runout, but the improvement in runout accuracy required of the wheel is mainly for vertical runout. In order to meet the above requirements, vehicle disc wheels have conventionally been processed as follows. First, the rim 1 is formed by cutting a sheet material, flash-butt welding it, and processing it using a plurality of roll forming machines. After roll forming, molding with a split mold such as an expander or shrinker is performed in the final step in order to adjust the shape and dimensions. For this reason, local deformation occurs in the area between the split molds of the rim, and eccentricity and ellipse occur around the entire rim circumference.Moreover, the bead seat portions 5 and 6 sides of each rim are always molded on the same center. The problem was that it was impossible. Further, although the disk 2 is formed by a multi-step press process, it has been impossible to completely eliminate eccentricity of the rim connecting portion due to design considerations and other factors.

Conventionally, the accuracy of a disc wheel consisting of an assembly of a rim 1 and a disc 2 has been determined by the accuracy of the rim and the disc alone.

As mentioned above, the conventional disc wheels obtained by welding and joining the rim and disc, which already have errors at the individual stage, cannot ensure 100% of the required quality accuracy after welding and assembly. 1. It would have been uneconomical to invest in equipment to improve the accuracy of disk 2 parts. In order to solve the above-mentioned accuracy problem of the disc wheel, the present invention ensures the required quality after the disc wheel assembly is completed, and spins the rim bead seat part after the disc wheel assembly is completed. By correcting the eccentricity and correcting both bead seats so that they are concentric, the disk hub hole is drilled or reamed in the final process.
It is an object of the present invention to provide a method for manufacturing a vehicle disc wheel with high vertical and lateral runout accuracy, and an apparatus that can be used directly to carry out the method.

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an apparatus according to this embodiment.

In the figure, 11 and 12 are a pair of molds, and the lower mold 11 and the upper mold 12 have mandrels 13 and 14 at the reduced outer circumference position, and hub surface pressers 15 and 16 at the inner circumference position, respectively. have. Lower mold 11 and upper mold 12 are attached to lower rotary plate 17 and upper rotary plate 18, respectively. At least one of the upper and lower rotary plates 17 and 18, for example, the upper rotary plate 18, is movable in the axial direction to sandwich the disk wheel between the two molds 11 and 12, and to separate it. It is now possible to do so. Mold 11,1
2, hub surface pressers 15, 16 and rotary plate 1
A guide 19 is provided that extends through the hub surfaces 15 and 18, and the guide 19 and the central hole of the hub surface pressers 15 and 16 slide together.
By being rotatably fitted, the upper and lower rotary plates 17 and 18
The upper and lower molds 11 and 12 are aligned on a concentric axis 20. Therefore, the mandrels 13 and 14 attached to the upper and lower molds 11 and 12 are also aligned on the concentric axis 20. As shown in FIG. 3, the mandrels 13 and 14 are not pressed against the outer diameter end of the flange of the rim and the drop portion, but are pressed against the outer diameter end of the flange of the rim and the drop portion, but are attached to the rim bead seat portions 5 and 6. It is adapted to be pressed from the inner diameter side, and has an outer circumferential shape that follows the inner circumferential shape of the bead seat portions 5 and 6 of the rim 1 of the disc wheel. mandrel 13
, 14 are slightly larger than the inner diameters of the bead seat portions 5, 6 of the rim 1. Reference numerals 21 and 22 denote a lower cushion and an upper cushion, which are made of an elastic material such as urethane rubber, and are inserted between the hub surface pressers 15 and 16 to elastically hold the hub surface of the disk 2. .

At positions around the mandrels 13 and 14 of the molds 11 and 12, rolling pressure rollers 23 are provided which are movable in the radial direction, that is, in the direction perpendicular to the concentric axis 20,
The rim bead seat parts 5 and 6 are inserted into the mandrels 13 and 14 from the outer periphery without pressing the outer diameter end of the flange and the drop part.
It has become possible to impose pressure on

The compacting roller 23 includes a pair of spinning rolls 24 and 24 so that the bead sheet parts 5 and 6 can be pressed simultaneously.
have. Although it is sufficient that one compaction roller 23 is provided in the circumferential direction as shown in the figure, two or more compaction rollers 23 may be provided in the circumferential direction in order to achieve symmetry in shaping and balance of loads. A cutter 25 serving as a tool for machining the hub hole is provided on the outer periphery of a portion of the guide 19 in the longitudinal direction.

The tool may be a cutting tool such as the cutter 25, or a tool for grinding, rolling, reaming, etc. The guide 19 is movable in its axial direction so that the cutter 25 can be brought to the hub hole 7 position with the disc wheel being elastically supported via the cushions 21 and 22 during hub hole machining. It's getting old. The guide 19 may also be configured to be rotationally driven as necessary, and in cases where the relative rotation between the disc wheel and the cutter 25 due to the rotation of the rotary plates 17 and 18 is insufficient to rotate the hub hole. Alternatively, the guide 19 itself may be rotationally driven. The method of the present invention is carried out as follows using the apparatus configured as described above.

First, a disk wheel to be corrected is set in the lower mold 11 set on the lower rotary plate 17.

Next, the guide 19 at the center of the rotary plate 17 is placed on the imaginary line A.
The upper mold 12 fixed to the upper rotary plate 18 descends to elastically support the hub surface of the disk 2 via the cushions 21 and 22 of the disk wheel. In this case, the upper and lower rotary plates 17 and 18 are
9 and are centered on the same axis 20 by the upper hub surface holder 16 and the lower hub surface holder 15. Eccentricity of the bead seat portions 5 and 6 of the rim 1 is automatically corrected by inscribing the outer peripheral tapered portions of the upper mandrel 14 and the upper mandrel 13. Since the outer diameter of the mandrels 13 and 14 is formed to be slightly larger than the inner diameter of the bead seat portions 5 and 6 of the disc wheel, when the disc wheel is clamped between the pair of molds 11 and 12, the rim 1 is already The ellipses of the bead seat portions 5 and 6 are slightly modified. After the clamping is completed, the rotary plates 17 and 18 start rotating, and the rolling pressure roller 2
3 moves forward and strongly presses the bead seat portions 5, 6 by a pair of spin rolls 24, 24.

As a result, the bead seat portions 5 and 6 of the rim 1 are shaped on the concentric axis 20, with both local deformation and deformation around the entire circumference, to form a perfect circle with high precision. At this time, the rim bead seat parts 5 and 6 are pressed against each other and try to extend in the circumferential direction, but since the outer diameter end of the flange and the drop part are not pressed against each other, they do not extend, and the rim bead seat parts 5 and 6 do not extend in the circumferential direction. are restrained and can be brought into close contact with the mandrels 13 and 14 smoothly, allowing smooth and reliable shaping into a perfect circle.

Next, the guide 19 is at the uppermost position (the position indicated by the solid line in the figure).
The cutter 25 near the center of the guide 19 hits the inner surface of the hub hole and cuts the inner peripheral surface.

As a result, the inner circumferential surface of the hub hole is
, 6 are machined with high precision on the same axis. At this time, the disc wheel is elastically supported on the hub surface of disc 2, so the disc is not restrained, and when the hub hole is machined in this state, the spring is released when the disc wheel is removed from the mold after machining. There is no back deformation, and the concentricity between the hub hole and the rim bead seat portions 5 and 6 remains well maintained.

After the processing is completed, first, the compacting roller 23 retreats, and the upper and lower rotary plates 17, 18 stop rotating.

Next, the guide 19 is lowered and at the same time the upper mold 12 is raised to release the disk wheel clamp. On this occasion,
Cushions 21 and 22 provided between both molds 11 and 12
As a result, the engagement between the mandrels 13 and 14 and the disc wheel can be easily released. Since the method and apparatus for processing a vehicle disc wheel according to the present invention are as described above, the following effects can be obtained according to the present invention. First, since correction and shaping are performed at the final stage after the rim and disk are assembled, highly accurate shaping is possible regardless of the degree of deformation or precision at the unit stage or welding assembly stage.

In addition, the disc wheel is rotated while being sandwiched between a pair of molds that are centered on each other's concentric axes, and the mandrel having the concentric axes is not applied to the outer diameter end of the flange and the drop part, but is inserted into the bead seat part. Since they are brought into contact with each other and subjected to spinning processing, the pair of bead seat parts are restrained from extending in the circumferential direction, and are brought into close contact with the mandrel, and both are corrected and shaped into perfect circles centered on the concentric axis with high precision.

In addition, at this stage, the hub hole is machined using a tool that moves on the concentric axis while the disk is elastically supported via the cushion, so the concentricity of the hub hole, which serves as the reference hole, and the bead seat part is adjusted. Moreover, even when the disc wheel is removed from the mold, there is no spring back of the disc wheel, so the concentric state is maintained, and by combining the above effects, extremely high precision shaping is achieved.

Therefore, a vehicle using the disc wheel obtained by the present invention has no fear of vibration during running, and can improve running performance.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a general disc wheel, Figure 2 is a schematic cross-sectional view of a general disc wheel during accuracy measurement, and Figure 3 is a cross-sectional view of a general disc wheel.
The figure is a sectional view of an apparatus according to an embodiment of the present invention. 1...Rim, 2...Disc, 5,6
...Bead seat part, 7...Hub hole,
11, 12... A pair of molds, 13, 14...
... A pair of mandrels 15, 16 ... A pair of hub surface holders, 17, 18 ... A pair of rotary plates,
19... Guide, 20... Concentric axis line,
23... compaction roller, 25... cutter.

Claims (1)

[Claims] 1. Between a pair of molds having concentric axes, the mandrel of the mold is brought into pressure contact with the rim bead seat portion from the inside diameter without being brought into pressure contact with the outer diameter end of the flange or the drop portion, and the disk is brought into contact with its hub surface. The disc wheel is elastically supported through a cushion, and while the mold is rotated, a pressure roller is pressed against the outer periphery of the rim bead seat to shape the rim bead seat in cooperation with the mandrel. A method of machining a disc wheel for a vehicle, comprising machining a disc hub hole while the disc is elastically supported by a machining tool having an axis concentric with a mold. 2 A pair of molds having a mandrel inscribed in the rim bead seat portion without contacting the outer diameter end of the flange and the drop portion of the disc wheel, and a hub surface presser that elastically supports the disc hub surface via a cushion are placed on concentric axes. The opposing molds are respectively disposed on a pair of rotary plates whose axis of rotation is the concentric axis, and at least one of the rotary plates is movable in the axial direction; At least one rolling roller movable in the radial direction is provided on the circumference to press the rim bead seat portion without forcing the outer diameter end of the flange and the drop portion of the rim, and a disk is provided at the center of the rotary plate as a cushion. 1. A processing device for a disc wheel for a vehicle, characterized in that a tool for processing a disc hub hole is provided while being elastically supported through a disc wheel, and the tool is movable in the axial direction.