JPS611501A - Method of welding wheel-disc to wheel-rim in aluminum wheel - Google Patents

Abstract

PURPOSE:To easily enhance productivity and weld-strength by cooling the outer surface of a wheel-rim together with welding a wheel-rim and a wheel-disc from inside by means of a welding torch while both the rim and the disc and a combination of a torch and a cooling part are being relatively rotated. CONSTITUTION:A rim 3 is mounted on a disc 2, which is fixd on the rotary plate 1A of a rotation-driving-equipment 1, while a welding torch 4 is placed inside both the disc 2 and the rim 3 so that the torch 4 faces the welding part. While the rotary plate 1A is being rotated, water is spouted from a cooling water nozzle 6, and the welding part is welded in the peripheral direction by means of the torch 4, during which time the welding part is cooled off by the cooling water. With this constitution, both productivity and weld-strength can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of welding a wheel disk and a wheel rim in a wheel made of aluminum-based metal material.

Conventional aluminum wheels, in which the wheel disc and wheel rim are welded together, have a structure in which they are welded together at or near the center of the rim when viewed in the width direction of the rim, which receives less stress during running, i.e., at the well. It has become.

Recently, a wheel has been proposed in which the disc is biased near one side end of the wheel (the position that is on the outside when mounted). This shape of the wheel not only improves air resistance when running, but also has the effect of further increasing the fashionability of the disc itself.

When creating a wheel with this shape, the case where the wheel disc is welded and fixed to the bead seat part of the wheel rim is compared to the case where the wheel disc is welded to the well part of the wheel rim and the disc is further biased. do,
Although this is preferable because the weight of the wheel can be reduced, on the other hand, there is a problem in that the strength of the wheel rim at the welded portion is reduced and cracks occur in the wheel rim during a driving test. Therefore, when welding the wheel disc and wheel rim in such wheels, an important issue is how to avoid a decrease in strength near the welded area and how to ensure the strength of the weld without adversely affecting the wheel rim. Become.

SUMMARY OF THE INVENTION The object of the present invention is to provide a simple and highly productive welding method that can obtain sufficient welding strength without reducing the strength of the surrounding area of the weld in welding a wheel disc and a wheel rim as described above. An object of the present invention is to provide a welding method that is advantageous when fixing a wheel disk to a beat-seat portion of a wheel rim.

The welding method according to the present invention focuses on welding from the inside while cooling the outer surface, which is the back side of the welding part, and the welding torch is used to connect the wheel rim and wheel disc from the inside of the wheel rim. The outer surface of the wheel rim, which is opposite to the welding part and on the back side of the welding part, is cooled, and in this state, the wheel disc, the wheel rim, and the welding torch are cooled.

It is characterized by performing welding in the circumferential direction by rotating the cooling part relatively. The cooling of the outer surface of the wheel rim performed in the method of the present invention is performed in order not to reduce the rim strength imparted during the manufacturing process of the wheel rim.
The temperature should be kept below about 0°C to 100°C. This can be accomplished by spraying cooling water, immersing it in water, blowing cooling air, etc. The welding method of the present invention will be explained in more detail below with reference to the drawings.

FIG. 1 shows an example of an apparatus configuration for implementing the present invention.

Reference numeral 1 indicates a rotary drive device, and this rotary drive device 1 is equipped with a disk 2 and a rim 3, as shown in FIG. 2, for example, so that they can be integrally driven to rotate.

In FIG. 2, a bolt 1 is placed on the rotary plate IA of the rotary drive device 1.
The disc 2 is fixed at the position 0, and the rim 3 is placed on top of the disc 2 for installation. The disk 2 can be fixed. Here, the rim 3 is supported by a flexible sheet 11, made of rubber, for example, provided along the periphery of the rotating plate IA, so that the required engagement of the disk 2 and the rim 3 can be achieved. Reference numeral 4 indicates a welding torch, for example a conventional arc welding device such as a TIG welding device is used. Here, the welding torch 4 is fixedly held at the welded portion between the disk 2 and the rim 3 by adjusting its position so as to be opposed to it from the inside of the rim 3, and the rotation drive device 1 rotates the disk 2 and the rim 3 integrally. , thereby performing a circumferential weld. Therefore, although not shown, the welding torch 4 is held by a support member so that its position can be adjusted.

A cooling water nozzle 5 is arranged on the outside of the rim 3 to cool the surrounding area from the back side of the welded part. The cooling water nozzle 5 is not particularly limited as long as it allows water to flow along a required portion of the outer surface of the rim 3. Similarly to the welding torch 4, the cooling water nozzle 5 is also positioned and held fixed, and the rotary drive device 1 rotates the disk 2 and rim 3 integrally, thereby constantly cooling the back side of the area where the welding is performed. It is done like this. Reference numeral 6 indicates a cooling water tray, and although not shown, it is preferable to arrange piping so that the cooling water is circulated between the cooling water nozzle 5 and the cooling water tray 6.

Here, in order to prevent the cooling water from flowing directly to the welded portion between the disk 2 and the rim 3, it is preferable that the axis of rotation by the rotary drive device 1 be inclined as shown in FIG. Further, forced air cooling can be performed by blowing cooled shop air instead of cooling water, or a water tank type cooling method can be adopted.

Furthermore, the welding portion is not limited to being continuously welded along the entire circumference, but it is also possible to perform intermittent welding.

The results of actual welding tests conducted using the method according to the present invention are shown below.

Large carbon aluminum wheels of sizes 6JJX14 and 6JJx15 as partially shown in FIG. 2 were used to compare the durability test results with and without cooling.

The material of the test wheel was St: 0.15% by weight.
, Fe: 0.2%, Cu: 0.05%, Mn
: 0.80%, I'1g: 2.8%, Cr:
0.40%, ZnFO, 03%, Ti: 0.1
It was an aluminum alloy containing %.

Welding was carried out using an apparatus having the configuration shown in FIG. 1, and 10 wheels of each size were welded with and without cooling. A TIG welding device was used as the welding torch, and the welding speed was about 1.3 m/min. During cooling, tap water at about 4°C was used as cooling water. The flow rate of cooling water is about 3~71! / minute.

As for the welding type, half of the cases are full circumference welding, and the other half are 6-way welding.
Eight welded parts each having a length of 5 mm were arranged at equal intervals in the circumferential direction.

The durability test was conducted in accordance with the bending moment durability test stipulated in Section 12.1 of the JASO automobile standard for light alloy disc wheels (established on June 18, 1975). As test conditions, the load was 271. kg, the bending moment was 271 kgm, and the rotation speed was about 60 Orpm. Further, for the 6JJX15, the load was 283 kg, the bending moment was 283 kgm, and the rotation speed was approximately 60 Orpm.

As a result, no defects such as cranks were observed near the welded parts in any of the welded products cooled according to the present invention. On the other hand, in all of the welded products that were not cooled, significant cracks were observed on the outer surface of the wheel rim 3, and hair cranks were observed on the back side of the disk.

溌1Fυura chestnut ■ Welding strength can be further improved by simple means.

■ To facilitate the production of aluminum wheels of the type described above.

[Brief explanation of drawings]

FIG. 1 is an elevational sectional view showing the configuration of an apparatus as an example of implementing the method of the present invention. FIG. 2 is a partially cutaway sectional view showing the aluminum wheel on the rotary plate in FIG. 1. 1...Rotary drive device IA...Rotary plate 2...Disk 3...Rim 4...Welding torch 5...Cooling water nozzle 6...Socket plate 10 ...Bolt patent applicant Nippon Light Metal Co., Ltd. patent applicant
New t94 Nikkei Koei Co., Ltd. Figure 1 Figure 2

Claims (2)

[Claims] (1) In the method of welding a wheel disk and a wheel rim, a welding torch is placed from the inside of the wheel rim opposite the welded part between the wheel rim and the wheel disc, and the outer surface of the wheel rim, which is the back side of this welded part, is cooled. A wheel disk and wheel rim in an aluminum wheel that is cooled with water/cooling air, and in this state, the wheel disk and wheel rim are relatively rotated with a welding torch and a cooling part to perform circumferential welding. Welding method with. (2) A method for welding a wheel disk and a wheel rim in an aluminum wheel according to claim 1, wherein the cooling is performed using cooling water from a cooling water supply nozzle located outside the wheel rim.