JPS5939432A - Production of rim for load wheel - Google Patents

Abstract

PURPOSE:To automate the positioning of a valve hole in a method for producing a rim with the valve hole in the prescribed position after coiling, welding and roll forming of a flat plate-like blank material, by punching a reference hole to the blank material before coiling. CONSTITUTION:A coil material W is cut with a cutter or the like to a short- sized blank material W1. A preparatory hole P1 is formed as a reference hole at the prescribed position of the material W1, then the material W1 is coiled and both ends are butted and welded. The welded material is roll-formed to a desired sectional shape. The hole P1 is then automatically detected and with the hole P1 as a reference, a valve hole P is punched in the position of the hole P1 or separately. The valve hole is thus punched automatically by avoiding the weld zone.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rim for a road wheel in an automobile.

This type of road wheel rim has conventionally been generally manufactured in the following manner. In other words, Figure 1 schematically represents the manufacturing process of the road wheel rim.
First, the coil material W is cut with a cutter in the cutting process A to obtain a short material W, and this material W1 is processed in the coiling process B.
Form into a cylindrical shape. Then, both ends of the roll-formed material W1 are butted together and welded, further roll-formed to obtain the desired cross-sectional shape, and finally, pulp holes P are drilled to attach the pulp to the road wheel rim. R is obtained. The thus obtained road wheel rim R is welded and integrated with a disc (not shown), and then undergoes a painting process to become the final product, a road wheel.

However, in the conventional road wheel rim manufacturing method, the pulp holes are punched in the final process, so the pulp holes P! 7! In order to meet the basic requirement that the drilling position must be avoided from the butt weld area for strength reasons, the position of the road wheel rim must be visually aligned. This has been a major obstacle to promoting labor savings and full automation of production lines.

This invention has been made in view of the above points. Prior to coiling, a reference hole is first formed in a predetermined position in the material in a child-like state, and after roll forming, pulp holes are formed using the reference hole as a reference. The object of the present invention is to provide a method for forming a , thereby solving the above-mentioned conventional problems.

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is an explanatory diagram schematically showing an embodiment of the present invention, in which the coil material W is cut using a cutting device such as a cutter or a blanking press to form a short material W. Similarly, in this example, the material W is processed before coiling.

A pilot hole is formed as a reference hole at a predetermined position, and after butt welding and roll forming are completed, the pilot hole is automatically detected again, and a pulp hole is formed at the pilot hole position using this pilot hole as a reference. It is designed to be drilled.

First, the outline of the apparatus used for carrying out the present invention will be explained. In FIGS. 3 and 4, I is a cutting device such as the above-mentioned cutter or blanking press; 2.
a, :Ib and 3 are belt conveyors arranged in series after the cutting device, and these belt conveyors 2a, 2b, 3 are formed narrower than the width of the coil material W. Further, as shown in FIG. 5, on both sides of the belt conveyors 2a and 2h, a pair of guide units 5 having a guide plate t and a guide roller unit 7 having a guide roller 6 are provided on the belt conveyor 2a.

They are arranged so as to face each other with 2b in between. These guide unit 5 and guide roller unit 7
Both are for regulating and positioning the widthwise position of the material W transferred onto the conveyors 2a and 2b, and the guide plate q is configured to move forward and backward by the operation of the cylinder 8. On the other hand, by rotating the screw 7 and the shaft 9, the guide roller 6 slides along with the holder 10 on the base 11 by a distance N, ? J and V adjustments are possible.

[2 is a stopper plate arranged between the belt conveyors 2b and 3, and this stopper plate 1-12 moves up and down by the operation of the cylinder 13, and the conveyors 2a, 2b
It controls the longitudinal positioning of the upper material W.

As shown in FIG. 6, a drilling device 14 is disposed between the guide units 5.

This drilling device 14 includes a C-shaped frame 15 and a slider attached to the C-shaped frame 15 so as to be able to be pulled down.

-16: A bcl frame 15 comprising a punch 17 attached to the slider 16, a ring 18 for unloading the slider 16, and a die 19.
The position can be adjusted by rotating the screw/wheel to slide it on the pace 2.

Therefore, as shown in FIGS. 3 and 4 in addition to FIG. 2, the coil material W supplied to the cutting device I is cut into a predetermined length, and this cut material W is guided by a rough guide. It is then conveyed to the conveyor 2a side, and stops when it reaches the stopper plate [2.

That is, the material W1 is first positioned in the longitudinal direction by hitting the stopper plate [2], and then the guide plate u moves forward due to the operation of the cylinder 8, and the material W is sandwiched between the guide plate q and the guide roller 6. positioning in the width direction. thus,
When the positioning of the element If) U'W+ is completed, the drilling device 14 is activated to drill a pilot hole P as a minute reference hole at the edge of the element W at the center in the longitudinal direction.

Here, it is desirable that the positional accuracy of the prepared hole P in the width direction of the material W is as high as possible. The reason is,
The pilot hole P is what will eventually become the pulp hole P,
As shown in Fig. 10, the cross-sectional shape of the part where the pulp holes P are formed is a curve, and the elongation during roll forming is very large, so it is necessary to form the pilot holes P1 with good precision in a flat plate state. This is because if not, highly accurate pulp holes P cannot be formed after roll forming. The positioning of the material W in the longitudinal direction is done by the aforementioned stopper plate [2], but in the longitudinal direction, it is only necessary that the lower hole p+ (pulp hole P) and the butt welded part described later do not coincide; Since it is sufficient that the hole position is a certain distance from both longitudinal ends of the material W1, great precision is not required.

When the machining of the pilot hole PI is completed as described above, the stopper plate 12 is lowered, and the material W is conveyed to the next welding process C by the belt conveyors 2b and 3, as shown in FIG. After butt welding is performed, roll forming is performed in a roll forming process.The pilot holes P do not disappear during the roll forming process, unlike markings such as paint.

Next, the material W1 that has undergone the roll forming process is transferred to a positioning device t23 shown in FIGS. 7 to 9 by a conveying device (not shown).
Here, the position of the prepared hole is determined and its position in the circumferential direction is determined.

As shown in FIGS. 7 to 9, the above-mentioned positioning device 23 mainly consists of a pair of guide rollers attached to the arm 5 on the frame 24 and a drive roller supported by the bracket 1. , the guide roller I is configured to move forward and backward by the operation of cylinder X. and,
A light emitter 33a and a light receiver 33b of a photoelectric switch Ω are disposed above and below the frame 24 so as to face each other. Incidentally, a window portion 24a is formed in a part of the frame M so as not to block the optical axis l connecting the light projector JJa and the light receiver 33b.

Therefore, the material W that has undergone the roll forming process as described above
, are transferred onto the frame M of the positioning device 23 by a transport device (not shown), the guide roller 5 and the drive roller 5 are moved to the cylinder, ?, respectively. 9. ．． : (By the operation of step 2, the material W is moved forward until it hits the material W, and by the activation of the pulse motor X, the material W is moved through the drive roller Z.

rotates. Then, when the light switch Ω detects the pilot hole P1 while the material W1 is rotating, the pulse motor X rotates by a certain amount from when the pilot hole P is detected and then stops. As a result, the material W1 is positioned in the circumferential direction with reference to the position of the prepared hole P.

When the positioning of the material W is completed in this way, the material W is transferred to the next step, the valve hole drilling process E, in the same posture by a transport device (not shown), and the valve hole P is drilled at the position of the pilot hole P3. By providing this, a road wheel rim R, which is a product, can be obtained.

Similarly, in the above embodiment, the pilot hole P was machined using the punch 1.
7 and die 19, but other methods such as a drill or laser may also be used.

However, once the positioning of the material W is completed using the pilot hole P1 as a reference, the valve hole P may be immediately formed at that position. However, for example, if the pilot hole P has only a so-called marking function, and the valve hole P is formed separately from this pilot hole in a certain arrangement relationship, it will not work. The purpose of the period is achieved. In this case, in order to use a road wheel to which a tubeless tire is mounted, the position of the pilot hole P1 must be set so that air from the tire does not leak.

As is clear from the above description, according to the present invention, a reference hole is formed at a predetermined position in the material prior to coiling,
By forming the valve hole using the reference hole as a reference after roll forming, there is no need for the manual work of visually detecting the butt weld as in the past, and the butt weld and the valve hole can be easily detected. Since it is possible to automatically position the materials so that they do not overlap, it has the effect of saving labor and making it possible to fully automate the manufacturing process of road wheel rims.

[Brief explanation of drawings]

Fig. 1 is a process explanatory diagram for explaining the conventional manufacturing process of a road wheel rim, Fig. 2 is a process explanatory diagram showing an embodiment of the manufacturing method according to the present invention, and Fig. 3 is a process explanatory diagram showing an embodiment of the manufacturing method according to the present invention. FIG. 4 is a front view of FIG. 3, FIG. 5 is a sectional view taken along the line v-V of FIG. 3, and FIG. 6 is a cross-sectional view taken along the line ■-■ of FIG. 3. The cross-sectional view, FIG. 7, is a plan explanatory view, FIGS. 8 and 9, of other devices used for carrying out the present invention.
The figure is a front explanatory view of FIG. 7, and FIG. 10 is a sectional view of the road wheel rim. W: Material, Pl: Pilot hole (reference hole), P: Valve hole.

Claims (1)

[Claims] (1) A process of coiling a flat material into a ring shape, a process of butt-welding both ends of the coiled material, a process of roll-forming the welded material, and a predetermined shape of the roll-formed material. A method for manufacturing a road wheel rim includes a step of forming a pulp hole for attaching pulp at a position, in which a reference hole is formed in advance at a predetermined position of the material in a step before the coiling step, and a step after the roll forming step. A method for manufacturing a rim for a road wheel, characterized in that pulp holes are formed using the reference hole as a reference.