JPH01228627A - Method for correcting wheel rim and manufacture of wheel - Google Patents

Abstract

PURPOSE:To manufacture a rim and a wheel high in accuracy by combining a diameter expanding operation by an inner roll halved by a well part and having a specified receiving surface and a widening operation by an outer roll having a specified pressure surface. CONSTITUTION:The inner rolls 11L, 11R halved by the well 2 part into right and left are provided with receiving surfaces 16, 17 controlling the inner circumferential surfaces of the bead sheet 5 and the flange 6. The outer roll 20, on the other hand, is provided with the flange 6, the well side surface 3, the pressure surfaces 24, 22. When the rolls 11L, 11R are separated to supply the rim 1 and both rolls are approached, the receiving surface 16 is forced into the inner surface of the bead sheet 5 and an expanding force A is actuated to that surface. At the same time, when the roll 20 is rotated in the direction opposite to the roll 11, circumscribes and presses the roll 11, the pressure surfaces 24, 22 comes respectively into contact with the flange 6 and the well side surface 3 to actuate the widening force B, C. Then, the disk is fitted into this rim 1, they are welded to form a wheel assembly and to correct the disk in accordance with the rim.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wheel rim used in an automobile and a method for finishing a wheel using the rim with high precision.

(Prior technology) The conventional method for manufacturing wheel rims is to first cut steel strips to a predetermined length, butt them together, weld them together, flare them at both ends, and then roll them three times to form a well. , a hump/bead seat flange, a curled portion, etc. are formed, and sizing processing is performed using an expander and a shrinker during or after the roll processing (Japanese Patent Laid-Open No. 158236/1983).

The rim thus obtained has an error in the radial direction, that is, vertical runout, and an error in the width direction, that is, lateral runout, so it is necessary to correct the rim.
In No. 8, the rim is fitted onto the inner roll, the inner roll is rotated, and the outline of the suppressor is pressed and shaped from the outer periphery of the rim while being oscillated, thereby improving precision.

In addition, a method for straightening the rim and the disk after welding the disk to the rim is also used, and in Japanese Patent Publication No. 59-32215, a mandrel is pressed against the inner surface of the bead seat of the rim, and the disk is fixed by an elastic body. A pressure roller is pressed against the outer surface of the bead seat portion to straighten the bead seat portion, and a cutter is inserted into the hub hole of the disk to finish cutting the hub hole. Similarly, as a correction after disc welding,
In Japanese Patent Publication No. 56-51847, the disk is held by pressing it from above and below, then the bead seat surface is pressurized with an outer periphery die to correct the outer periphery dimension and distortion, and finally the knob hole and nut seat are punched. It is corrected by applying pressure.

(Problem to be solved by the invention) Recently, with the increasing luxury of vehicles, the slight size of wheels has become smaller.
Vertical and lateral vibrations due to differences have become a problem,
From the viewpoint of riding comfort, it is desired to eliminate the slight vibrations of the wheels caused by these vibrations.

In all of the above-mentioned conventional straightening methods, the bead seat portion of the rim is pressed inward from the circumferential surface using a presser or a roller, but the rim is a ring body with a plurality of curved cross-sectional shapes. Therefore, even if the bead seat portion was pressurized in this manner, it did not easily deform and a sufficient correction effect could not be obtained. In particular, since the rigidity of the foil increases after disk welding, straightening becomes even more difficult.

Therefore, the object of the present invention is to obtain a high-precision rim with no vertical runout or lateral runout, and to correct the disc welded to this rim using the rim as a reference to obtain a wheel with high precision overall. be.

(Means for Solving the Problems) As a means for solving the problems described above, the present invention provides an inner roll that is divided into two at the well portion and has a receiving surface that defines the bead seat of the rim and the inner peripheral surface of the flange. A means for press-fitting from both sides of the rim, pressing an outer roll having a pressure surface for the flange of the rim and a well side part against the outer periphery of the rim, and expanding the diameter of the rim with the inner roll while expanding the width with the outer roll, and the rim. A rolling process to form the shape, a shaping process to align the left and right diameters of the rim after the rolling process, and an inner roll divided into two parts is press-fitted into the inner surface of the bead seat part of the rim, and an outer roll is circumscribed and widened to form the rim. A correction process for improving vertical and horizontal runout of the rim;
Consisting of a wheel assembly process in which a disc is inserted into the rim after straightening and welded, and a disc straightening process in which the disc surface is straightened, the nut seat is coined, and the hub hole is bar-linked based on the rim of the wheel assembly. This method uses means characterized by the following.

(Function) When the above-mentioned means is used, the expansion force in the width direction by the outer roll acts during the expansion of the bead seat part due to the press-fitting of the inner roll, and when forces in two directions act in this way, the bead seat part , it is deformed relatively neatly and has an inner surface shape that matches the shape of the inner roll, and the flange portion also has a shape that matches the tapered surface of the outer roll, thereby correcting vertical and lateral runout.

Then, a highly accurate wheel can be obtained by fitting and welding a disk into this rim, and then correcting each part of the disk using the rim as a reference.

(Example) An example will be described below based on the drawings. FIG. 1(a) shows the rim 1 before correction, and FIG. 1(b) shows the rim 1 after correction.
The rim includes a bead seat 5, a flange 6, and a curl 7, and the rim before correction has a slightly smaller bead seat diameter and width than the rim after correction. The rim roll straightening device IO consists of inner rolls IIL and IIR and an outer roll 20, which are divided into left and right halves as shown in Fig. 2(a) and (C).
Consisting of both inner rolls IIL and IIR are protrusions 1
2 and the hole 13, and are disposed in a line and supported so that they can move forward and backward relative to each other. Both inner rolls IIL.

111? each includes a well receiving surface 14, a well side receiving surface 15, a bead seat receiving surface 16, and a flange receiving surface 17, and the outer roll 20 has a well pressurizing surface 21, a well side pressurizing surface 22, and a bead seat pressurizing surface. 23, a flange pressure surface 24, and a curl pressure surface 25. and,
As shown in FIG. 1, before correction, there is an expansion allowance A between the inner circumferential surface of the bead seat 5 and the receiving surface 16 of the inner roll ILL, and the flange 6, the well side surface 3, and the pressure surface 24 of the outer roll 20 .22, there is an expanded diameter, and there are gaps in other parts. The other inner roll III? The same relationship is established for .

Both inner rolls IIL, 111? Release the rim 1
When the rolls are brought close together, the bead seat receiving surface 16 is press-fitted into the inner surface of the bead seat 5 of the rim 1, as shown in FIG. to act. At the same time, when the outer roll 20 is rotated in the opposite direction to the inner roll and external pressure is applied, the flange pressure surface 24 contacts the flange 6 and applies a widening force B, and the well side pressure surface 22 also contacts the side surface 3 of the well to widen the width. Apply force C. When forces act in two directions on the bead sheet 5 in this way, the bead sheet portion 5 deforms into a relatively compact shape and comes into close contact with the entire surface of the bead sheet receiving surface 16 of the inner roll, and the flange 6 also forms a flange. Receiving surface 1
Close to 7.

At this time, the surface of the outer roll 20 should not come into pressure contact with the outer surface of the bead sheet 5 from the beginning, and the outer roll should be shaped so that a minute gap t remains or comes into contact with the outer surface of the bead sheet 5 at the end, as shown in FIG. 1 (1)). use

The amount of correction by the roll straightening device 10 must be large enough to cause plastic deformation in the rim material, and in the case of a passenger car wheel, the diameter expansion type using the inner roll has a radius of 11
The widening method using the outer roll is 1 to 2 on one side in the width direction.
(2) is preferable, and by press-fitting both rolls, the bead sheet 5
expands under tension in the circumferential and width directions.

As shown in FIG. 2(C), the vertical runout of the bead seat 5 of the rim 1 thus corrected was determined with a meter a, and the lateral runout of the flange 6 was measured with a meter. A high-precision rim with single unit precision of 0.15 mm in both longitudinal and lateral run-out was obtained.

This rim straightening process is carried out after the shaping process (2) in which the left and right diameters of the rim are made equal during the process shown in FIG. 3(a) or (b). The reason for this is that since the rim is asymmetrical, the left and right diameters will not be the same during roll forming, and if the inner roll IIL 5111 is press-fitted in this state, accurate correction will not be achieved. 3(a) are the steps disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 58-158236, in which the roll straightening of the present invention is performed in step 2 after the shaping step 2, and the disk is inserted in step 2. Perform spot welding, process■
Correct the disc using the rim as a base.

Figure 3 (b) shows the three steps ■a1■ in (a).
This method is shortened to two steps in step (a), and even with this method, the insufficient roll processing can be compensated for in the roll straightening step (2), and highly accurate straightening can be performed.

FIG. 4 shows the process of forming the disk to be assembled to the rim 1 and the process of assembling it to the rim 1. In step ``■'', the material 30 is deep drawn, and in step ``■'', the curved surface 30 other than the outer peripheral portion 31 is
2, punch out hub holes 33, bolt holes 34, and decorative holes 35 on the curved surface 32 in step 2', coin the decorative window and pressurize the entire surface again in step 2', and form the outer peripheral part 31 into a cylindrical shape in step 2'. A disc 37 is formed by bending the flange 36 of the disc 37, and the disc 37 is fitted and welded to the rim 1 to obtain a foil 38 shown in (2).

Next, the method for straightening the disk 37 of this foil 38 will be explained in the fifth example.
This will be explained using figures. This figure shows the disk straightening device 40 at the end of its stroke, in which the bolster 41
A die holder 42 and a die 43 are sequentially fixed on top of the die 4.
A positioning pin 44 that engages with a bolt hole of the disk 37 is provided inside the disk 3 along with a spring 45.

A stopper 42a is provided at the upper end of the die holder 42 and protrudes toward the outer periphery, and a lower operating cam 47 having a cam surface 47a is fitted to the die holder 42 below the stopper 42a, and the spring 4
A lower holder base 48 is fitted on the outer periphery of the lower operating cam 47, and three or more pairs of inverted-shaped guides 48 are fitted on the upper surface of the base 48.
a is erected, the center line of each pair is oriented toward the die center line, and a stopper 48b is fixed to the back surface. A spring 48c acts on the lower surface of the base 48, the vertical movement is guided by a guide pin 49 having a head 49a, and a stepped portion 48d
The amount of upward movement of the lower actuating cam 47 is regulated by this.

The L-shaped rim holder 5D is guided by each pair of the inverted-shaped guides 48a and the upper surface of the base 48 so as to be able to move forward and backward in the radial direction, and the cam surface 50a on the front surface circumscribes the cam surface 47a. A rim holding surface 50b is formed on the outer surface,
It is being fired from behind by a spring 50c.

A punch holder 52 and a punch 53 are fixed to the lower surface of the ram 51, and a coining punch 54 for correcting bolt holes is embedded in the punch 53 facing the positioning bin 44. A stopper 52a is protruding from the lower end of the punch holder 52, and an upper operating cam 5 having a cam surface 55a on the outer periphery.
5 is fitted and springed by a spring 55c.

The annular upper holder base 56 supports the upper operating cam 55 at its stepped portion 56a, is guided by a guide pin 57 having a head 57a, is biased downward by a spring 57a, and is guided by a guide pin 57 having a head 57a, and is biased downward by a spring 57a. When descending, the lower holder base 48 is brought into contact with the lower holder base 48 and kept parallel thereto. Further, on the lower surface of the upper holder base 56,
The same number of sets of L-shaped guides 56a having the same shape as the guide 48a are provided downward, each set slidably holding an L-shaped rim holder 60, and the front cam surface 60a is connected to the cam surface 55a.
The rim is held on the outer surface of the piece circumscribing and extending downward.
is formed and is pressurized from behind by a spring OOc.

Further, a cylinder 61 is fixed inside the lower die, and a lower haunch B2 for hub hole burring is attached to the rod 61a of the cylinder 61, and moves up and down within the center hole of the die 43 and punch 53.

Next, the operation of this device 40 will be explained. When the upper mold, that is, the bolster 51 and the parts connected thereto, are raised, the springs 47b and 48c of the lower mold extend and the lower operating cam 47 is locked to the stopper 42a, and the lower holder base 48 is moved to the head 49a of the bin 49. The stopper 48
d is separated from the stepped portion of the lower actuating cam 47 and the rim holding surface 50
b moves to a higher position.

Further, in the upper mold, the upper operating cam 55 is connected to the stopper 52.
a by the spring 55c, and the upper holder base 56 is locked to the head 57a of the guide pin 57.

The wheel 38 is supplied and its rim 1 is placed in the lower rim holder 5.
0 and lowers the ram 51, the upper rim holder 80 engages with the upper edge of the rim 1, and the upper and lower rim support surfaces 5
0b and 80b are in contact with the inner peripheral surface of the bead seat 5 of the rim 1. In this state, the rim holders 50 and 60 are spaced at a constant distance due to the presence of the rim 1, and as the ram 51 continues to descend, the upper and lower operating cams 47
．． 55 enters and pushes and holds the rim holder 50, 60 outward under the action of the cam surfaces 47a and 50a, 55a and 80a.

At this time, in the lower holder base 48, since the stopper 48d is seated on the lower operating cam 47, the radial position of each set of lower cam holders 50 is also constant, and the rim 1 is held concentrically with the lower die. In the upper mold, since the upper operating cam 55 is stopped by the stopper 52a, each set of upper cam holders 60 is also positioned at a fixed position and holds the upper edge of the rim 1 concentrically.

When the ram nail is further lowered from this state, the rim 1 is slightly elastically deformed and the plurality of balance pins 49 come into contact with the lower holder base 48, causing the upper and lower holder bases 5B, 4
The lower actuating cam 47 is lowered while maintaining a constant distance of g, and the lower operating cam 47 is seated on the bolster 1. In this state, disk 37
is in contact with the lower surface of the punch 53 and has a slight gap between it and the upper surface of the die 43. As the ram 5I continues to descend, the punch holder 52 and punch 53 descend, pressing the disc 37 against the die 43 to correct the disc shape and perpendicularity to the rim 1, and stamping the bolt hole with the coining punch 54 to form the hole. Correct the shape.

Next, the cylinder 61 is energized and the lower bunch 62 burrs the hub hole.

At this time, the whole surface of the disk 37 is covered by the bunch 53 and the die 43.
Since the coining bunch 54 is held in a depressed state, the disc 37 is securely held.
Even when burring is performed, which tends to generate large side pressure, the position of the disk 37 does not change, and the hub hole can be corrected accurately. Therefore, it is possible to manufacture a highly accurate wheel based on the highly accurately corrected rim 1.

(Effects of the Invention) As described above, the present invention uses both the diameter expansion action of the inner roll and the width expansion action of the outer roll, so that plastic deformation of the rim is relatively easily performed, and the inner surface shape of the rim is Since the shape matches the shape of the pressure receiving surface, the outer surface shape is also accurate.

A disk is then welded to this rim, and the disk is corrected using the rim as a reference, so the entire wheel is also accurately corrected.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are explanatory diagrams of the rim straightening process, and Figure 2 (
a) is a front view of the rim correction device, (b) is a side view, and (b) is a side view of the rim correction device.
C) is a partially enlarged view, (d) is an explanatory diagram of accuracy measurement, Figure 3 (a) (b) is an explanatory diagram of the foil manufacturing process, Figure 4 is a process explanatory diagram of the disc manufacturing process and assembly, FIG. 5 is a longitudinal sectional view of the disc straightening device. 1... Rim 2... Well 5... Bead seat 6... Flange 11L IIR...
Inner roll 20...Outer roll 37-...3 people outside the disc

Claims (1)

[Claims] 1. An inner roll that is divided into two parts at the well portion and has a receiving surface that defines the inner peripheral surfaces of the bead seat and flange of the rim is press-fitted from both sides of the rim, and the flange and well sides of the rim are press-fitted. A method for straightening a rim for a wheel, characterized in that an outer roll having a pressurizing surface is brought into pressure contact with the outer periphery of the rim, and the diameter of the rim is expanded by the inner roll while the width is expanded by the outer roll. 2. A rolling process to form the rim shape, a shaping process to align the left and right diameters of the rim after the rolling process, and press-fitting the inner roll divided into two into the inner surface of the bead seat part of the rim, and circumscribing the outer roll to widen the width. A straightening process involves forming the rim to improve vertical and lateral runout, a wheel assembly process in which a disc is inserted into the rim after straightening and welding, and a disc surface is straightened based on the rim of the wheel assembly, and the nut seat is fixed. A method for manufacturing a high-precision wheel, comprising a disc straightening process of coining and bar linking of a hub hole.