JPS6397312A - Method and device for correcting wheel - Google Patents

Abstract

PURPOSE:To improve the concentricity and squareness of a hubdisk-fixing face by accurately locating the disk on the inner peripheral face of a rim after press fitting and welding the disk to the rim and performing corrective press working by upper and lower metal dies. CONSTITUTION:A work whose disk B is press fitted and welded to a rim A of the work is carried into, is positioned by a positioning pin 4, is put on a lower rim holder 13, and an upper rim holder 34 is brought into contact with the rim A by down movement of a ram 25. By further down movement of the ram 25, the disk B is pressed by a die 3 and a punch 27 and a hub fitting face b1 and a nut face b2 are pressed and corrected and the squareness of the desk B to the rim A is corrected. Although the both members A and B are fixed by welding after press fitting, a sufficient plastic deformation is given to only the disk B by forming an initial gap between the disk B and the die 3 so as to facilitate the correction. In addition,a punch 45 is pushed up by an actuating lever 47 to be press fitted into a die 48 of the punch 27 to perform the burring work of a hub hole b3, so that the concentricity of the disk B is also positively gotten.

Description

Detailed Description of the Invention (Industrial field for FLJ) The present invention provides a method and method for straightening an automobile wheel made by molding a rim and a disc separately and then welding the two parts together. Regarding equipment.

(Conventional technology) Automotive wheels made by welding a rim and a disc have to be carefully adjusted to ensure the roundness of the rim and to completely prevent vibration, vertical vibration, etc. during driving.
Is it necessary to do the same as above for the shape of the hub and the fR change of the hub and rim installation shop? As a means for this purpose, for example, the invention of Japanese Patent Publication No. 56-51847 is known,
This is done by applying even pressure from the outer periphery to the wheel after the rim and disc have been rolled to correct the roundness of the rim, and then pressing the disc with an upper and lower die to burr the knob holes. The hub mounting surface is machined, and the nut seat is then polished.

(Problems to be Solved by the Invention) In the above-mentioned conventional means, the ?VH for straightening and holding the rim is
A peripheral press is disposed on the outer periphery of the rim, and an upper mold having a cam surface is provided on the outer periphery of the press to surround the press.

Because of this configuration, the outer mold and the upper mold surrounding it are
It becomes a form that surrounds the entire wheel.

Not only does it have the disadvantage of being large and expensive, but the mechanism for loading and unloading the workpiece is pressed around the outer periphery of these molds.

If it is attempted to be installed so as not to interfere with the upper mold, etc., the insertion and removal mechanisms will become large and automation will also become difficult. Even if such a large-scale device is used, a large correction effect cannot be expected because shrink molding is more difficult to perform than expand molding and the rim is more rigid.

Furthermore, since the hub mounting surface is machined after the hub hole is burred, the upper and lower dies cannot prevent the large side pressure generated by the burring process when the pilot hole is eccentric, and the burring process may damage the entire disk or the hub. Because the hub mounting surface will be processed while the mounting surface is distorted,
After the mold is released, there is a risk that the hub hole will be eccentric and the hub mounting surface will be out of roundness.

Furthermore, since the disk is supported by the lower mold from the beginning and there is no gap, it is difficult to completely correct the inclination of the disk because it cannot be deformed by light.

(Means for solving the problem) By the way, as a result of repeated consideration of wheels,
A single rim can be manufactured with relatively high precision, and there is little deviation in roundness even when a disc is assembled, but it is difficult to achieve precision for a single disc, and the concentricity and angle when assembled to the rim are small. It turned out that the deviation was also large.

Therefore, after press-fitting the disc into the rim and welding it, the invention uses the inner rim of the rim as a reference surface for disc straightening and straightens the disc with high precision to improve the precision of the entire wheel. By not using a pressurizing mechanism, the θ mechanism can be made smaller and easier to handle as shown in Figure 9. The mechanism is simplified by applying pressure only in the axial direction, so the method is to press-fit and weld a molded disc into the inside of the molded rim. Hold both ends of the inner peripheral surface of the disk and position it with a gap between the disk and die.

A method characterized by pressurizing the disk toward die 1 with a punch to straighten the hub mounting surface and coining the nut seat, and burring the hub hole while maintaining pressure between the punch and die; A plurality of upper and lower rim holders having a rim holding surface on the outer periphery and a cam surface on the inner periphery are respectively attached to the upper and lower holder bases so as to be slidable in the radial direction, and a cam surface that cooperates with the cam surface is formed on the outer periphery. The cam and the upper and lower holder paces are supported by a ram and Zelsta with springs interposed between them, a punch and a die equipped with a disk straightening surface and a nut seat coining surface are fixed to the ram and Gelsta, and the center of one of the punch and die is fixed. The device is characterized in that a die for burring the hub hole is provided at the center of the hub hole, and a nozzle is provided at the center of the other end for cooperating with the die.

(Function) By the above means, the disc is correctly positioned on the inner peripheral surface of the rim and then pressed for correction by the upper and lower molds, so that the concentricity and roundness of the disc and its hub mounting surface are maintained. Similarly, since the burring process is performed while continuing to pressurize the mold, even if a large lateral pressure is generated due to the process, the disk is held by the mold and is not affected by the lateral pressure.

(Example) The method and implementation of the present invention will be explained below with reference to the drawings.

Figure 1 shows 1. + Shows the positional relationship of each part at the time when the wheel correction stroke is completed by the device of the invention 1
In the diagram, A is the wheel rim, B is the disc, and rim A is
It has a bead seat al+a2 into which a tire bead fits, and the disc B has a hub mounting surface bI+a nut seat J+a hub hole b3.

There is a guide holder (2) on the top of the press press bolster (1).
, a die (3) is fixed, and a plurality of position pins (4) that engage with the bolt holes of the disk B are installed inside the goo (3) together with a spring (5).

A stopper (6) is protruded from the upper part of the guide holder (2), and an annular lower operating cam (7) with a cam surface (3) is fitted to the lower part of the stopper (6), and the stopper (6) is held by a spring (9). 6
).

An annular lower holder base 0 is attached to the outer periphery of the lower operating cam (7).
0 is fitted and positioned using a headed guide pin @ pressed by a spring (11J), and four split rim holders (to) are attached to the lower holder base Oe so as to move forward and backward in the radial direction. The holder α3 has stepped portions CL4) projecting from both sides thereof, which are engaged with a pair of inverted guides αQ protruding from the holder base 01 to guide the forward and backward movements.

There are 7 rung heads on the rim holder (to), and on the outer periphery there is a rim person's bead sea) on the back side of the f8! A rim holding surface αη is provided to attach the rim, and a cam surface C rod is formed on the inner periphery to cooperate with the cam surface (8), and both cam surfaces (8) are held together by a spring α9.
, (goods) are under pressure. The rim holder a3 has an operating cam (
The maximum pushing position is between the operating cam (7) and the stepped portion (A) of the holder base 00.
Ql).

A punch holder (A) and a punch holder are fixed to the lower part of the ram (C) which is raised and lowered by a hydraulic device, a coining punch holder is embedded in the punch holder, a stocking holder is extended from the lower end of the punch holder (to), and the punch Fitting a hole-shaped upper operating cam (to) having a cam surface C (I) on the holder (1),
It is suppressed by the spring Q toward the stopper c21.

An annular upper holder base (
), and attach the four upper rim holders to the lower surface of the upper holder base (c) using the same means as the lower rim holder (3) so that they can move forward and backward at will. That is, the rim holding surface (2) has a length close to the length obtained by dividing the inner circumference of the rim into four, and the cam surface 93.
It has a cam surface ■ that cooperates with It is regulated by the stepped portions (7) and (6).

The upper holder base (C) receives downward force due to its own weight, the pressure of the spring (6), etc., and is suspended by a single-headed guide pin (G). The lowering is restricted by the balance pin (9), and each part of the upper holder base 00 and the rim holder (to) stops while remaining parallel to the lower holder base 00 and other tools.

Among the springs installed in the upper and lower movable parts, there is a spring (9).

Q is strong and other springs 0υ, (/4 force are weak).

An upper punch (T) is inserted through the center of the gouer (3), and is connected to the operating rod 0'7) of the hydraulic cylinder installed inside the bolster (1) and the gouer holder (2). A guide (
In cooperation with G), burring the no.1 hole b3.

The operation of this device will now be explained with reference to schematic diagrams in FIGS. 2 to 4. Place the rim on De α1, lower the ram (a), and bring the upper rim holder [present] into contact with the rim. At this stage, the diameter of the hub hole of disk B is smaller than the diameter after correction, and the shape around this hub hole may be flat, or it may be preformed to 1'Ei] in the range of 90Qf. You can leave it there. In this state, the operating cam (7
), <'A is pressed against the stopper (6) and the holder base (10, (to) by the pressure of the springs (9) and (2).
The springs aυ, (6) press against the heads of the guide pins (2), -, and the rim holders a'a, Ca11 are held in fixed positions at the positions of the respective members 9, resulting in the state shown in FIG.

Next, as shown in Fig. 3, when the ram @ is further lowered, the operating cam moves to the 1% work holder (b) and the rim A through the spring.
, the pressing force is transmitted to the work holder (13, operating cam (7), and spring (9), and the cam surface (8), CI+3), 6υ
, (to) causes the rim holder 03. ζ■ is pushed outward in the direction of the arrow, accumulates along the circumferential surface of the rim, and moves slightly up and down with the holder pace 0(], (to), and the rim holding surface αη, (To) is bead sheet al+a2
'M is attached to the inner peripheral surface of. At this time, the step portions Qυ, (A) 1st step portion) and (411) collide with each other, so the operating cam (
7), no further relative movement occurs between τ1 and the rim holder 0 (to). At this time, disk B and Gui (3
), the punch hand is not in contact with 1.

Next, as shown in Figure 4, if you push down the ram (c) further,
The lower actuating cam (7) is seated on the bolster (1) as shown in A by the pressing force from the spring (2) through the rim member to the spring (9), and the disc B is.

As shown by the opening, it is in close contact with the punch holder, but there is a slight gap between it and the gui (3), and there is also a gap between the upper operating cam (1) and the ram so, as shown by C.

When the ram C9 is further lowered, it becomes the state shown in Fig. 1, and is pressurized by the disc/B1d guide (2) and the bunch wing, presses and straightens the hub mounting surface bh nut seat b2, and also corrects the roundness with respect to the rim A. Correct.

Both parts A and B are fixed by welding after press-fitting, but by creating a gap between the disc and the lower die, it is possible to apply primary plastic deformation to only the disc part, and correction is easy. It will be held in

The gap shown by C above is also maintained, and only the pressing force of the spring (2) acts on the rim member, so no shaping action occurs.

Next, while continuing this press state, operate the hydraulic cylinder () and push up the 9-nozzle (g) using the operating rod 0η and push it into the bunch@ gouy to burr the hub hole b3. do. In burring processing, if there is eccentricity between the punch and the prepared hole, a large side pressure will be generated, which will shift the position of the workpiece, and the position of the hub hole and nut seat after burring will be inaccurate. Since the face bl, nut seat b2, etc. are securely held down with a guide (3), a coining punch, etc., even if the prepared hole is eccentric, side pressure is prevented, and the hub hole b3 and nut seat b2 are accurately pressed. molded.

(Effect of the invention) Uninvented, the rim and disc are press-fitted and then welded.

Although the inner circumferential surface of the rim is used as a reference, since only the disk is processed independently of the rim, the shape of the disk and the centrifugal deformity can be corrected without any adverse effects on each other between the five members. Since the center hub hole is burred in the 2-pass condition, the concentricity of the disc can also be reliably corrected.

Furthermore, in the present invention, since the inner circumferential surface of the rim is used as a reference for correction and is gripped, gripping devices such as a rim holder and an operating cam can be arranged inside and above and below the rim. Even if the shaft hide is small, it is possible to carry in and out the workpiece, and a small and simple device path can be used.

[Brief explanation of the drawing]

The drawing shows an apparatus for carrying out the method of the invention, the first
The figure is a longitudinal cross-sectional view of the press state, and Figures 2 to 4 are schematic diagrams showing the operating state. show. (3)...Gui (7), (1)...Operating cam GQ, C41...Holter base Q3, N...Rim halter @...Punch wire...
Coining punch (c)... 2 people other than Nozenchi

Claims (2)

[Claims] (1) Press-fit and weld the molded disc inside the molded rim, hold both ends of the inner peripheral surface of the rim, position with a gap between the disc and the die, and punch the disc. A wheel straightening method characterized by applying pressure toward a die to straighten the hub mounting surface and coining the nut seat, and burring the hub hole while maintaining pressure between the punch and die. (2) A plurality of upper and lower rim holders having a rim holding surface on the outer periphery and a cam surface on the inner periphery are respectively attached to the upper and lower holder bases so as to be slidable in the radial direction, and a cam surface cooperating with the cam surface is formed on the outer periphery. The upper and lower operating cams and the upper and lower holder bases are supported by a ram and a bolster with springs interposed between them, a punch and a die having a disc straightening surface and a coining surface for a nut seat are fixed to the ram and the bolster, and the punch and the die are fixed to the ram and the bolster. A wheel straightening device characterized in that a die for hub hole burring is provided at one center and a punch cooperating with the die is provided at the other center.