JP2005186713A - Method for manufacturing highly accurate full design wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a 2 piece welding type steel wheel of full design capable of highly accurately securing a relative position of a rim and a disc. <P>SOLUTION: This method for manufacturing the 2 piece steel wheel is a method for manufacturing a highly accurate full design wheel 10. In the method, a flange part 12 of the disc 11 is cut from a back face side, a radial stepped surface 20 extending from the back face cutting part to the shaft direction inside is formed with a hub hole reference by cutting at an inner diameter end of the back face cutting part 16, an inner peripheral surface of a bead sheet part end part 15 on a flangeless side of the one side flangeless rim 13 is fitted into the radial stepped surface 20 of the disc 11, and the bead sheet part end part 15 on the flangeless side of the one side flangeless rim 13 and the back face cutting part 16 of the flange part 12 of the disc 11 are welded and joined in the fitting state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a fully designed two-piece steel wheel with improved dimensional accuracy.

There is a full-design wheel as a wheel that has greatly improved its position as a high-design steel wheel in recent years (Japanese Patent Laid-Open No. 10-236102).
Here, the “full design wheel” refers to a wheel that is welded and joined by contacting the end of a bead seat of a rim that does not have a rim flange at one end in the axial direction on the back surface of a disk having a flange formed on the outer periphery. This means a high-design wheel in which the joint line between the rim and the disk is not visible when viewed from the outside in the axial direction.

Conventionally, when assembling a full design wheel, as shown in FIG. 7, the end portion 5 of the bead seat 4 on the flangeless side of the rim 3 is brought into contact with the back surface 6 of the flange portion 2 of the disk and positioned by a positioning jig 7. In addition, the contact portion was welded from the outside of the rim 3.
In this case, for positioning, the shaft 7a of the positioning jig 7 is passed through the hub hole 8 of the disk 1 so that the relative position between the jig 7 and the disk 1 can be accurately obtained. This is performed by pressing the R portion 9 of the drop portion to bring out the relative position between the jig 7 and the rim 3 and pressing the rim 3. As a result, the rim 3 and the disk 1 are positioned and fixed via the positioning jig 7.

However, when the rim 3 and the disk 1 are positioned and fixed by the positioning jig 7 of FIG. 7, the positioning of the rim 3 and the disk 1 is not necessarily highly accurate.
The reason for this is that the R portion 9 of the drop portion of the rim 3 that has been rim-formed by roll forming does not have high accuracy, so the R portion 9 of the drop portion of the rim 3 is removed by the taper cone 7b of the positioning jig 7. This is because the rim 3 cannot be positioned with high accuracy even if it is pressed. As a result, there has been a problem that the relative position between the bead seat portion of the rim and the hub hole center of the disc cannot be obtained with high accuracy.
JP-A-10-236102

  The problem to be solved by the present invention is that it is difficult to position the rim with high precision and weld the rim and the disk with the conventional full-design two-piece welded steel wheel. This is a problem that it is difficult to ensure the relative position of the disk with respect to the center of the hub hole with high accuracy.

  The object of the present invention is to secure the relative position between the rim and the disk with high accuracy when welding the rim and the disk, and as a result, ensure the relative position between the bead seat portion of the rim and the hub hole center of the disc with high accuracy. The aim is to provide a fully designed two-piece welded steel wheel.

The present invention for achieving the above object is as follows.
(1) A method of manufacturing a two-piece steel wheel,
Cutting the flange portion of the disk from the back side, and forming a radial step surface extending inward in the axial direction from the back cutting portion at the inner diameter end of the back cutting portion by cutting based on the hub hole,
Fitting the inner peripheral surface of the end portion of the bead seat on the flangeless side of the rim on one side flangeless to the radial step surface of the disk,
In this fitted state, the bead seat part end of the flangeless side of the one-side flangeless rim and the rear cut part of the flange part of the disk are welded and joined together.
Manufacturing method of high-precision full design wheel.
(2) Before welding the flangeless side bead sheet end of the one-side flangeless rim to the rear cut portion of the disk flange, with reference to the axially outer end surface of the flange on the flanged side The method for producing a high-precision full-design wheel according to (1), wherein cutting is performed in parallel with the axially outer end face of the flange of the rim.

According to the manufacturing method of the high-precision full design wheel of (1) above, a radial step surface is formed on the back surface of the flange portion of the disk by cutting based on the hub hole, and the bead seat portion on the flangeless side of the rim is formed there Since the end portions are fitted and the rim and the disk are welded, the rim and the disk can be positioned and fixed with high accuracy, and the dimensional accuracy of the full design wheel after welding becomes high.
According to the manufacturing method of the high-precision full-design wheel of (2) above, the bead sheet end of the rim flangeless side is cut in parallel with the axially outer end surface of the rim flange before welding with the disk. Therefore, when the end of the bead seat on the flangeless side of the rim is fitted to the radial step surface on the back of the flange of the disc, the end of the bead seat on the flangeless side of the rim is the flange of the disc. The end portion of the bead sheet on the flangeless side of the rim can be fitted to the radial step surface without detaching from the radial step surface of the back surface of the flange portion of the disk.

The manufacturing method of the high precision full design wheel of this invention is demonstrated with reference to FIGS. FIG. 6 shows a high-precision full-design wheel manufactured by the method of the present invention.
The manufacturing method of the high-precision full design wheel 10 of the present invention is a manufacturing method of a two-piece (two-piece rim 13 and disk 11) high-precision full-design steel wheel,
(A) The flange portion 12 of the disk 11 is cut from the back side, and the radial step surface 20 extending inward in the axial direction from the back cutting portion 16 is cut with respect to the hub hole 18 at the inner diameter end of the back cutting portion 16. Formed,
(B) The inner peripheral surface of the end portion 15 of the bead seat portion 14 on the flangeless side of the rim 13 on one side flangeless is fitted to the radial step surface 20 of the disk;
(C) In this fitted state, the flange-less bead sheet end 15 of the one-side flangeless rim 13 and the rear cut portion 16 of the flange 12 of the disk 11 are welded together.
It has a process.

  In the conventional full design steel wheel, the flange portion of the disk is not cut, but in the present invention, the flange portion 12 of the disk 11 is cut from the back side to form the back cut portion 16. A radial step surface 20 is formed at the inner diameter side end of the back cut portion 16. As shown in FIG. 3, the radial step surface 20 may be formed in a step shape on the back cut portion 16, or, as shown in FIG. 4, the back cut portion 16 has a groove 23 (the groove 23 is on the back surface). Forming a part of the cutting portion 16) and forming a stepped shape on the bottom surface of the groove 23.

  In the step (a), as shown in FIG. 1, a shaft 24 of a cutting machine or a jig is inserted into the hub hole 18 to position the disk 11 in the radial direction, and a surface orthogonal to the shaft rod 24. The disk 11 is positioned in the axial direction by abutting the hub mounting surface 26 of the disk to 25, and in this state, the axially rear surface of the flange portion 12 of the disk 11 is cut, and the rear cutting portion 16 and the radial step surface 20 are separated. Form. The back cutting portion 16 and the radial step surface 20 formed in this way are concentric with the hub hole 18.

As shown in FIG. 2, the flange-less bead sheet end 15 of the rim 13 of the one-side flangeless rim 13 is fitted into the rear cut portion 16 of the disk flange 12 and welded to the flange of the rim 13. Cutting is performed in parallel with the axially outer end surface 22 of the flange of the rim with reference to the axially outer end surface 22 of the flange 21 on the existing side.
In the rim 13, the roundness of the rim 13 is obtained by an expander of the bead sheet 14 after roll forming. Therefore, the rim 13 only needs to be accurate in the axial direction of the bead seat portion end portion 15 on the flangeless side. Therefore, the bead seat end portion 15 on the flangeless side of the rim 13 is fitted to the flange 21 on the flange-attached side of the rim 13 before the rim 13 is fitted and welded to the rear cut portion 16 of the disc flange portion 12. The distance from the axially outer end surface 22 is constant, that is, only the parallelism with the axially outer end surface 22 of the flange 21 on the flanged side of the rim 13 is obtained. FIG. 2 shows this parallelism. As shown in FIG. 2, the outer end face 22 in the axial direction of the flange 21 on the flanged side of the rim 13 is brought into contact with a surface 27 perpendicular to the wheel axis of the cutting machine or jig, and the bead sheet 14 on the flangeless side of the rim 13. A taper surface 28 of a cutting machine or a jig is applied to the inner peripheral surface of the steel sheet to cut the flange-sheet-side bead sheet portion end portion 15 so as to increase the axial accuracy of the flange-less-side bead sheet portion end portion 15. .

  Thus, the rear cut portion 16 and the radial step surface 20 of the flange 12 of the disk 11 and the end portion 15 of the bead seat 14 on the flangeless side of the rim 13, which have dimensional accuracy in the radial and axial directions of the disk 11, In the step (b), the fitting is performed. In this fitting, welding has not been performed yet, but the rim 13 and the disk 11 are fitted to such an extent that they do not come apart from each other during transportation. This fitting may be performed using a fitting machine or the like, although a jig as shown in FIG. 7 is not used.

  Next, in the step (c), as shown in FIG. 5, the bead seat end 15 on the flangeless side of the rim 13 on the one side flangeless is axially connected to the rear cut portion 16 of the flange 12 on the disk 11. By abutting, the bead sheet end 15 of the flangeless side of the rim 13 of the one-side flangeless and the rear cut portion 16 of the flange 12 of the disk 11 are welded. This welding is all-around welding. This welding is normally fillet welding, but may be penetration welding by providing a welding groove at the rim end.

  The high-precision full-design wheel 10 of the present invention manufactured by the above method includes a wheel in which a full-design disc 11 and a rim 13 are welded and joined, and has a back cutting portion 16 on the back surface of the flange portion 12 of the disc 11. The end portion of the bead sheet 14 on the flangeless side of the rim 13 has a radial step surface 20 concentric with the hub hole 18 extending inward in the axial direction from the back cutting portion 16 at the inner diameter end of the back cutting portion 16. 15 is abutted in the axial direction against the rear cut portion 16 of the flange portion 12 of the disk 11, and the end portion 15 of the bead sheet 14 on the flangeless side of the rim 13 is fitted to the radial step surface 20, thereby The end portion 15 on the flangeless side of the flange rim 13 of the loess rim 13 and the rear cut portion 16 of the flange portion 12 of the disk 11 are welded together.

  According to the manufacturing method of the high-precision full design wheel 10 of the present invention, the radial step surface 20 is formed on the back surface of the flange portion 12 of the disk 11 by cutting based on the hub hole 18, and the flangeless of the rim 13 is formed there. The rim 13 and the disk 11 are welded together by fitting the side bead sheet end 15 (this bead sheet part is rounded and centered by the expander) and being welded. Can be positioned and fixed with high accuracy, and the full design wheel 10 after welding has high dimensional accuracy.

  Further, since the bead sheet end 15 on the flangeless side of the rim is cut in parallel with the axially outer end surface of the rim flange before welding with the disk 11, the bead sheet on the flangeless side of the rim is cut. When the end portion 15 is fitted to the radial step surface 20 on the back surface of the flange portion 12 of the disk 11, the bead sheet end portion 15 on the flangeless side of the rim is pivoted to the back cutting portion 16 of the disk flange portion. The bead seat portion end 15 on the flangeless side of the rim can be fitted to the radial step surface 20 without detaching from the radial step surface 20 on the back surface of the disk flange portion.

It is sectional drawing of the formation process of the radial direction step surface of the back surface of the flange part of a disk in the manufacturing method of the high precision full design wheel of this invention. It is sectional drawing of the cutting process of the bead seat part edge part by the side of the flangeless side of a rim in the manufacturing method of the high precision full design wheel of the present invention. It is sectional drawing of the disk flange part of the stage which formed the radial step surface of the back surface of the flange part of the disk in the manufacturing method of the high precision full design wheel of this invention. It is sectional drawing of another example of the disk flange part of the step which formed the radial step surface of the back surface of the flange part of a disk in the manufacturing method of the high precision full design wheel of this invention. In the method of manufacturing a high-precision full-design wheel according to the present invention, the disk flange portion at the stage where the bead seat portion end on the flangeless side of the rim is welded to the back surface of the flange portion of the rim, and the bead seat end portion on the flangeless side of the rim FIG. It is sectional drawing of the high precision full design wheel manufactured with the manufacturing method of the high precision full design wheel of this invention. It is sectional drawing of the wheel and jig | tool in the step in the middle of the manufacturing method of the conventional full design wheel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 High precision full design wheel 11 Disc 12 Disc flange part 13 Rim 14 Rim bead sheet 15 Flange-less bead sheet end part 16 Flange part rear cut part 18 Hub hole 20 Radial step surface 21 Rim flange on flange side 22 Outer end surface 23 in the axial direction of the rim flange 23 Groove 24 Shaft rod 25 Surface 26 orthogonal to the shaft rod Hub mounting surface 27 Vertical surface 28 Tapered surface

Claims (2)

A method of manufacturing a two-piece steel wheel,
Cutting the flange portion of the disk from the back side, and forming a radial step surface extending inward in the axial direction from the back cutting portion at the inner diameter end of the back cutting portion by cutting based on the hub hole,
Fitting the inner peripheral surface of the end portion of the bead seat on the flangeless side of the rim on one side flangeless to the radial step surface of the disk,
In this fitted state, the bead seat part end of the flangeless side of the one-side flangeless rim and the rear cut part of the flange part of the disk are welded and joined together.
Manufacturing method of high-precision full design wheel.   Before welding the flangeless bead seat end of the one-side flangeless rim to the rear cut portion of the disk flange portion, the rim is on the basis of the axially outer end face of the flange on the flanged side. The method for manufacturing a high-precision full-design wheel according to claim 1, wherein the cutting is performed in parallel with the axially outer end face of the flange.

Images