JPS58168449A - Method for working outside frame of ornamental wheel ring of resin wheel cap for car - Google Patents

Abstract

PURPOSE:To entirely prevent breakdown of a material and to improve yield of the material, by welding both ends of a band plate of two product portions so as to be a cylinder, cutting and separating the width direction center part into two pieces, and performing curl-working and form-working to both of them, respectively. CONSTITUTION:A rectangular band plate 1 of width having two product portions is curled in he shape of a cylinder, plasma arc welding is executed by butting both end parts 2, and a cylindrical hollow frame body 10 is formed. In this regard, a starting part 5 and an ending part 5' of the butt welding part are left unwelded. Subsequently, said body 10 is cut and separated into two bodies 10a, 10b by roll-working along a drum part center 8 of the hollow frame body 10. To the separated cylindrical hollow frame bodies 10a, 10b, curl-working 3 is executed setting a cut side 1' to its outside circumferential side, and after that, form-working, etc. are executed, by which a product is obtained.

Description

Detailed Description of the Invention The present invention relates to a method for processing the outer frame of a decorative wheel ring of a resin hubcap for an automobile, in which both ends of a band plate for the product Yukitai are plasma arc welded, and after joining into a cylindrical shape 11, Roll processing the center part of the direction)! It is characterized by cutting and separating the sea bream, and then curling and shaping each piece (by pressing) into a predetermined shape.

Conventionally, as a method for processing the outer frame of a decorative wheel ring of a 1111 wheel cap for an automobile, curl processing has been adopted when the length of the seven flange on the outer and inner circumferential sides is relatively short compared to the width of the product. During curling, generally some compression occurs in the material on the inner shoulder side, and a large amount of elongation occurs in the material on the outer circumferential side, and if there is a part that is weak against elongation, it will break from that part.

In general, plasma arc welding has a problem in that the surface tension of the welding bead at the start and end of the welded part of the material always causes holes due to melt dripping. To prevent this interstitial layer, conventionally, as shown in FIG. 2, a small unwelded part (e) occurs at the ζ0 portion where welding is started from a point slightly intrusive from the end surface of the material.

Since the non-fII contact part @C is weak against elongation, a lug ■ is attached to the top of the hollow frame body as shown in the illustration of Plasma Arc III.
After cutting the material as shown in Figure a)
There was a problem with a bad IP. Alternatively, there is a method to eliminate the unwelded part on the outer periphery by not attaching the lug (■) and inserting a cut (■) into the product as shown in Figure 4, but the shape of the product is stagnant and the appearance is not good. There are layers.

Also, in plasma arc welding, there is a method of using a IIIF contact plate as a method of welding the strip to its fullest extent, but it is not a perfect measure to prevent the strip from falling, and concentrated stress occurs in this area. However, there was a Kan-etsu point from which the broken and defective products were released.

As shown in the IMs diagram, the present invention involves plasma arc welding of both ends of a rectangular strip (■) with a width of 2 minutes (product design), and after welding the thin cylindrical IK (HS) diagram of the HS diagram, the center of the width of the strip (■) is rolled. I) As shown in Figure 7! IIK cut and separate. After that, when curling by press working, the cut part α is on the outer circumferential side,
Furthermore, by positioning and curling the unwelded part 0@L on the inner circumferential side, curling can be performed with stable 911 degree silver. It is something.

An embodiment of the present invention based on the following 1i11iK! This will be explained in detail.

The rectangular strip ■ shown by M&WJK is the product O shown in Figure 910.
The developed length of the cross-section ms shape is as wide as the width of the product, and the length is the same as the tip length d when the inner circumferential side (2) of the product is developed, and is 111 (by shearing).

Next, this strip plate ■ is curled into a cylindrical shape 11 like JII6WJ, both ends all@@ are brought together, and a cylindrical hollow frame body [phase] is formed by plasma arc welding [F] from the - side end. . One end 0 of the butt weld is an unwelded part at the start part, and the other end V is an unwelded part at the final part, both of which are used to prevent melting caused by the surface force of the melting surface from falling.

Next, this hollow frame is cut and separated into 2 parts (1.a) and (1.b) by roll processing along the center 0 of the body as shown in FIG.

Thereafter, the cylindrical hollow frame body (1ea) was separated by a general press working method.
As shown in lJK, the curling process ■ is carried out in row 1, and then the molding process 01 is carried out to form the final m51m, and as shown in Figure 10, the decoration wheel A/% of the auto heavy duty resin hub cap is made.
The outer frame of the I-ring is processed, and during this curling process, the cut part α is on the outer periphery side, as shown in the two-point chain in the Ukihata figure.
By curling it so that it is rounded, it is possible to prevent excessive force from being applied to the unwelded part or the side of the hole C.

In addition, the non-S* part ■C that occurs in the inner part 111K of the product often gets wedged in the groove of the resin hubcap, and there is no gap in appearance. In the above example, roll processing is required)
Although the cylindrical hollow frame body is cut into three pieces, there is no problem in cutting it by another method using a press aK.

Invention #i! -minus strip ■ by shearing) lI9,
When the two parts of the material are brought together and plasma arc welded, an unwelded part V is formed to prevent the edges of the plasma arc welding from falling off, forming a circular O hollow frame [
After that, it is cut and separated into two parts by roll processing, and when curling by press processing, the unwelded part is on the inner circumference side, and the cut sway by roll processing is curled on the outer circumference side. It is characterized by eliminating parts that are vulnerable to elongation over time, completely preventing material breakage, and improving material yield by 100% without scraping.

[Brief explanation of the drawing]

JII#A is a large front view of a hollow frame body with nine ears attached, and Figure 2 is a perspective view of the same hollow frame body with plasma arc welding. ) Drop 9 Perspective - 1$14 Figure I is a perspective view of the product in the case where the unwelded part on the outer periphery is cut out, Figure 1ijS is a front view of the round rectangular band plate developed from the hollow frame of the present invention, No. @l! il is a perspective view of the hollow frame body after plasma arc welding according to the present invention, Figure 7 is a perspective view of the hollow frame body after two-saw cutting and separation by roll processing according to the present invention, and Figure 118 is a foreshadowing of curling by press working. The JIe figure is a perspective view of the decorative wheel ring of the automatic heavy duty 11 wheel cap, and Figure 10 is the J1!
9100-mu sectional view. ■ is a rectangular strip plate H is a cut section ■ is both ends ■ is a curling process ■ is a molding process ■ is an unmelted Il! Department [Co., Ltd.] is a &i plasma welding department for cylindrical hollow frames. Patent applicant Taiheiyo Kogyo Co., Ltd. Figure 2 L tears

Claims (1)

[Scope of Claims] Just as a decorative wheel ring for an automobile ll1i1 wheel cap is manufactured from a hollow body whose upper end and lower layer have the same diameter using a large forming method mainly by curling by pressing, the cross-sectional length of the product is A rectangular strip (2) with twice the width is curled into a cylindrical body, both ends (2) are brought together, and the joined parts are brought into plasma arc S contact. After that, the weld bead is polished, and then the center of the body of the cylinder is cut into two pieces by roll processing, and then the cylinder is curled with the cut side α facing the outer circumference in a curling process using a press. Accordingly, a method for processing the outer frame of a decorative wheel ring of an automobile resin hubcap, which is characterized by completely preventing material destruction;