JPS60131301A - Wheel rim and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To aim at the promotion of lightweightiness, by constituting the thickness of a flange part in a way of making it thicker as much as the specified volume than that of a blank, in case of an aluminum wheel made up of an expansible material. CONSTITUTION:A wheel rim 1 is locked to space between a rim locking upper member 10 and a rim locking lower member 11, and a backup roller 12 is forcibly pressed to an outer side of the wheel rim 1, rotating the rim locking lower member 11. Next, each of working rollers 13 and 14 is forcibly pressed to a flange part 2 and then the thickness of the flange part 2 is increased to be thicker as much as about 50-100% than that of a blank. With this constitution, the thickness of the flange part can be brought to be desired one, thus improvements in strength and lightweightiness both are promotable.

Description

[Detailed description of the invention] And distortion! The present invention relates to a wheel rim for an aluminum wheel used in automobiles, etc., and a method for manufacturing the same.

l Yoneta 5 aluminum wheels are available in one-piece, two-piece or three-piece type.
There are various types such as the piece type, but in order to simplify manufacturing, improve productivity, and reduce costs, the wheel rim and wheel disc are often manufactured as separate parts and then assembled together to complete the process. , .

When manufacturing a wheel rim as a single unit in this way, conventionally, a rolled sheet material is bent and joined at both ends to form a cylindrical material, or it is pressed and rolled out to form a complete cylindrical material without welding lines. An integrated cylindrical material is formed, and this cylindrical material is subjected to, for example, roll-form processing to complete a wheel rim having a desired shape.

By the way, a wheel rim has a shape in which parts with different diameters are continuous in the axial direction, so when a cylindrical material is processed into the desired shape, the wall thickness at the bent part or the enlarged diameter part tends to be smaller. In addition, it is not desirable to increase the overall wall thickness in advance for this reason. Therefore, when adopting the method of bending the plate material and welding both ends to form a cylindrical material, 1. It is known to increase the thickness of the required portions in advance at this stage. However, this is not possible when using a completely integrated cylindrical material with no weld line through extrusion processing, etc., and tedious processing such as cutting is required to forcibly change the wall thickness.

As a technology that solves the drawbacks of the technical idea of giving wall thickness changes to cylindrical materials in advance, we have developed a technology that uses the cooperation of a die and punch with selected factors such as the taper angle to produce parts where the wall thickness tends to decrease. We previously proposed a method that can conversely increase the wall thickness.

This makes it possible to increase the thickness of the required parts without increasing the overall thickness unnecessarily, making it possible to further reduce the overall weight.

However, in actual use, the flange portions on both edges of the wheel rim are exposed to the most severe conditions. For this reason, if a material thick enough to guarantee sufficient strength in this part is used, the thickness in other parts will be excessive, causing problems in terms of weight reduction, etc. Furthermore, if weight reduction is emphasized, the strength of this part may be insufficient, making it more likely to be damaged by contact with curbs or obstacles, or causing deformation when changing tires.

For this reason, it is desirable to increase the thickness of the flange portions on both edges of the wheel rim without affecting the thickness of other portions. However, there is no wheel rim that satisfies this requirement in the past, and in other words, it is still insufficient in terms of weight reduction, etc., and there is a strong demand for improvement.

The object of the present invention is to provide a wheel rim that can meet the above-mentioned demands and a method for manufacturing the same.

Hikari 3F11 The wheel rim of the present invention is characterized in that the flange portions on both edges are made thicker than the other portions, and as a method for this purpose, a cylindrical material is used to increase the wall thickness. The wheel rim is formed by roll processing after the wheel rim is formed, without forming a thick wall portion at the step of step 1.

Figure 1 shows a wheel rim according to the invention. As shown here, the feature of the wheel rim of the present invention is that the wheel rim l
is made of expanded material, and in particular, the wall thickness of the flange portions 2 at both edges of the wheel rim 1 is made much thicker than the other portions. The extent of this increase in wall thickness is, for example, approximately 7 to 9 Ill assuming the wall thickness of the material is 4.5 m + n.
The thickness is set to be approximately 50% to 100% greater than the thickness of the material. This increase in wall thickness is carried out on the flange part 2 independently of the forming process of the wheel rim l by the method according to the invention which will be explained below.

FIG. 2 shows a method for manufacturing the wheel rim l shown in FIG. The wall thickness increasing process is shown. - In FIG. 2, the illustrated wheel rim 1 has already been formed from a cylindrical material into a substantially perfect wheel rim shape by processing such as roll lamination. The illustrated implementation device for increasing the wall thickness of the flange portion 2 with respect to the wheel rim 1 includes an upper rim fixing member 10, a lower rim fixing member 11, a backup roller 12, and a processing roller 1.
3.14.

The upper rim fixing member 10 and the lower rim fixing member 11 are coaxially arranged opposite each other. Here, the lower rim fixing member 11 is rotatably driven at a fixed position via a shaft 15 by a suitable rotary drive device (not shown). On the other hand, the rim fixing upper member 10 is fixed to the shaft 16 and is movable and rotatable in the axial direction of the shaft 16, and is capable of rotationally driving the wheel rim 1 by sandwiching it between the rim fixing lower member 11 and the rim fixing lower member 11. It is now possible to do so. For this purpose, the rim fixing upper member 10 and the rim fixing lower member 11 each have a peripheral surface shape that is closely based on the wheel rim 1 at the stage of processing.

The backup roller 12 is located outside the wheel rim 1 which is fixedly held by the upper rim fixing member 10 and the lower rim fixing member 11, and is rotatable by a shaft 17 and can approach/leave the wheel rim 1. . This bank up roller 12 is the processing roller 1
3.14, and has a complementary peripheral surface shape to the vicinity of the flange portion 2 of the wheel rim 1, as shown in the figure.

Processing rollers 13 and 14 are arranged at appropriate intervals in the circumferential direction so as to be opposed to the tip surfaces of the flange portion 2, respectively, and are rotatable by shafts 1B and 19 and are rotated with respect to the tip surfaces of the flange portion 2. It is possible to approach/leave. Both machining rollers 13.14 also have a machining groove 20.2 for receiving the flange portion 2, as shown.
1, and by pressing the flange portion 2, the flange portion 2 is deformed into a shape regulated by the processed grooves 20, 21, thereby increasing the wall thickness of this portion.

According to the method of the present invention, as can be seen from the above, the wheel rim 1 in an appropriate processing stage (in the illustrated example, in a substantially completed shape)
is fixed between the rim fixing upper member 10 and the rim fixing lower member 11, and the backup roller 12 is pressed to the outside of the wheel rim l to rotationally drive the rim fixing lower member 11.

The corresponding post-processing rollers 13, 14 are each pressed with a suitable pressing force onto the flange part 2, thereby increasing its wall thickness. In this way, the flange part 2 of the wheel rim 1 alone can have its wall thickness arbitrarily increased.

School curse east study The effects of the present invention are as follows.

- The flange part, which is most likely to be damaged or deformed, can be made to have a desired thickness regardless of the thickness of other parts.

■ Therefore, a great effect can be obtained in increasing the strength of the wheel rim and reducing its weight.

■ It is extremely easy to increase the wall thickness of this flange.

■ The process of increasing the wall thickness of the flange part can be easily combined with the conventional process.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a flange portion which is a feature of the wheel rim according to the present invention. FIG. 2 is a sectional view showing an implementation device used in the step of increasing the wall thickness of a flange portion, which is a feature of the method of the present invention. l...Wheel rim 2...Flange portion 10...Rim fixing upper member 11...Rim fixing lower member 12...Backup roller 13.14/Processing roller 15.16.17 .18.19...Shaft 20.21
... Machining groove

Claims (2)

[Claims] (1) It is an aluminum wheel made of wrought material, and the wall thickness of the flange portion is approximately 50% or more than the material wall thickness.
4. A wheel rim characterized by an increase of about 10%. (2) A method for manufacturing a wheel rim, which comprises the step of processing a cylindrical material into a wheel rim, including the step of performing roll processing to increase the wall thickness of the flange portion of the wheel rim.