JP2639460B2 - Processing method of spoke hole of wheel hub - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming spoke holes of a wheel hub of a bicycle or a motorcycle, and more particularly, to a method of forming spoke holes on both side surfaces of a wheel hub using a single press working machine. The present invention relates to a method for processing a spoke hole of a wheel hub for performing opening and imposition.

2. Description of the Related Art As is well known, wheel hubs for bicycles, motorcycles, and the like have a well-known structure in which disk-shaped flanges are integrally formed on both sides of a hub body, and a predetermined number of spoke holes are formed in the flanges. So that the spokes can be attached radially.

Conventionally, the opening and imposition of the spoke holes of the wheel hub are performed by mounting the wheel hub material on a mold of one press working machine and simultaneously opening and imposing the flanges on both sides. In addition, the flanges on both sides deformed and the product could not be manufactured, and the opening and imposition on both sides of the wheel hub were divided into each process, and each was performed by four press machines.

Problems to be Solved by the Invention Therefore, the hub material for the wheel must be attached to and detached from each of the four press working machines, which is troublesome and labor-intensive. Was difficult, time consuming, and extremely productive.

Means for Solving the Problems The present invention has been made in view of the above points, and in order to solve the above problems, a hub material for a wheel such as a bicycle or a motorcycle is subjected to an upper die and a lower die of a press working machine. Between the upper die and the upper surface of the floating die table. It is another object of the present invention to provide a method of machining a spoke hole of a wheel hub, wherein the opening and imposition of a spoke hole on the other side of the wheel hub material are sequentially performed on a lower mold and a lower surface side of a floating die table. .

According to the present invention, a required wheel hub material is put into a press working machine and mounted on a floating die table, whereby the floating die table is moved up and down in parallel so that flanges on both sides of the wheel hub material can be moved. The opening and imposition of the spoke holes can be automatically performed by a single press machine without the need for centering and centering. In addition, the floating die table is moved up and down, and the upper die and the lower die are used to sequentially open and impose the spoke holes on both sides of the wheel hub material, thereby forming both sides of the wheel hub material. Processing can be performed with high productivity without distorting the flange or generating a defective shape.

Examples Hereinafter, the present invention will be described based on examples.

FIG. 1 et seq. Show one embodiment of the present invention. 1 and 2 show an embodiment of a bicycle wheel hub in which the aluminum material of the present invention is integrally formed by cold forging. Disc-shaped flanges 3 are provided on both sides of a cylindrical hub body 2. A predetermined number of spoke holes 4 are radially formed in the periphery of the flange 3 and an imposition 5 is made around the spoke holes 4 as shown in FIG. I have.

FIG. 3 et seq. Show an embodiment of a press working machine 6 for automatically working the spoke holes 4 and the imposition 5 of such a wheel hub 1 and a working method thereof.

As shown in FIG. 3, the press processing machine 6 sets the lower die 8 on the lower bed 7 and sets the upper die 10 on the upper slide 9 and sets the lower die 8 and the upper die 10 together. A floating die table 11 is disposed between the die and the hub material 12 for a cold forged wheel as described above is mounted on the floating die table 11, and the upper die 10 and the upper surface of the floating die table 11 are used for wheels. The spoke hole 4 of the flange on one side of the hub material 12 is opened and the imposition 5 is performed, and the lower die 8 and the lower surface side of the floating die table 11 are used to form the flange 3 on the other side of the wheel hub material 12. The opening of the spoke hole 4 and the imposition 5 can be performed.

The floating die table 11 is divided into a plurality of parts such as two parts in the circumferential direction with sufficient rigidity, and the divided floating die table 11 is slidable in a radial direction by a hydraulic cylinder (not shown) or the like so as to be slidable in a radial direction. The material 12 is exchangeably mounted, and the wheel hub material 12 is mounted so as to be slidable in the axial direction. Also, as shown in the figure, a floating die table support device 13 (having a hydraulic cylinder or the like, if necessary) having a required elastic force is provided on the bed 7 so that the floating die table 11 is always kept upward. Pressing and biasing is performed.

The upper and lower portions of the flange 3 on both sides of the wheel hub material 12 mounted on the floating die table 11 are provided with spoke hole forming dies 14, as shown in FIGS. The upper mold 10, the floating die table 11, and the lower mold 8 are arranged facing each other. As shown in FIG. 4, the spoke hole processing dies 14, 15, 16 and 17 are provided on the surface facing the wheel hub material 12 so as to face the spoke holes 4 for punching the projections 18 for imposition as shown in FIG. At the same time, punching holes 19 are provided around the floating die table 11 corresponding to the spoke holes 4, respectively.
Punching punches 20 and 21 are respectively provided on the slide side and the bed side in correspondence with the spoke holes 4, so that the spokes 4 of the upper and lower flanges 3 are sequentially punched as the slide 9 descends. And flange 3
When drilling holes on the upper side, the end face of the upper punch stopper 22 is brought into contact with the upper surface of the floating die table 11 so that the upper punch 20 does not overrun, and via the upper stopper 22 The floating die table 11 can be pushed downward. When drilling a hole on the lower side of the flange 3, the floating die table 11 is brought into contact with a lower punch stopper 23 provided on the bed 7, and a punch for punching on the lower side is formed.
21 allows the slide 9 to stop without overrun. Numeral 24 denotes a punched material discharging hole, which is capable of appropriately discharging the punched material by vacuum suction. In addition, the above-mentioned spoke hole processing dies 14, 17 on the slide side and the bed side are used.
Are mounted via holding members 25 and 26, and can be pressed and driven against the flange 3 surface by a holding member pushing device 27 and a holding material pushing device 28 such as a hydraulic cylinder having a predetermined output. And the floating die table support device 13
Of the spoke 3 of the upper flange 3 of the wheel hub material 12 with the push-up force of the sliding member and the holding member pressing device 27 on the slide side, and a predetermined output disposed opposite the floating die table support device 13. The floating die table pressing device 29 and the bed-side holding material lifting device 28 can imposing the spoke holes 4 of the flange 3 at the lower part of the wheel hub material 12. Reference numeral 30 denotes a guide pin for the upper die.

Then, as shown in FIG. 3, the hub material 12 for wheels is mounted on the floating die table 11 of the press machine 6, and
As shown in the figure, the slide 9 is lowered, and the spoke hole 4 of the flange 3 on the upper part of the wheel hub material 12 is punched by the punch 20 for punching on the upper side. When the punching is completed, the upper punch stopper 22 hits the floating die table 11, and the upper punch stopper 22
Is pushed down to lower the pinched wheel hub material 12.

Subsequently, the slide 9 is lowered, and the spoke holes 4 of the lower flange 3 of the wheel hub material 12 are punched by the lower punch 21 as shown in FIG. Spoke hole 4
, The floating die table 11 comes into contact with the lower punch stopper 23, and the slide 9 stops.

Subsequently, as shown in FIG. 7, the slide 9 slightly rises,
The floating die table 11 is pushed up by the floating die table support device 13 until it comes into contact with the floating die table positioning device 29.

Then, as shown in FIG.
Is operated to press the imposition projections 18 of the spoke hole machining dies 16 and 17 around both sides of the lower spoke hole 4 to perform imposition.

After that, the floating die table positioning device 29
Is released, and the floating die table 11 is raised by the repulsive force of the floating die table support device 13. Then, as shown in FIG.
Between the spoke hole forming die 14 on the slide side and the spoke hole forming die 15 on the floating die table 11, and the punch 9 for punching on the upper side
When the sliding member 20 is released from the spoke hole 4, the slide-side holding member pressing device 27 is operated, and the imposition projections 18 of the spoke hole processing dies 14 and 15 are pressed around the spoke hole 4 to perform imposition.

Thus, the opening of the spoke hole 4 of the wheel hub 12 and the imposition of both side surfaces thereof are performed, the slide 9 is lifted and stopped at the upper limit, and the floating die table 11 is also divided after stopping at the upper limit, and the processed wheel is divided. The hub 1 for the wheel is taken out, the hub material 12 for the next wheel is mounted, and the wheels are sequentially processed as described above.

Therefore, the spoke holes of the flanges at both ends of the wheel hub can be automatically opened and imposed by one press working machine, and the centering of the spoke holes on both sides and the necessity of alignment are eliminated. The productivity is several times greater than in the past.

In particular, in the above embodiment, the opening of the spoke hole of the flange of the upper part of the wheel hub, the opening of the lower part, the lower part is imposed according to the rise of the slide,
Since the upper surface is processed sequentially, the cycle time can be minimized and processing can be performed more efficiently.Flange distortion and imposition of the flange due to imposition also occur. It can be molded with high quality without using.

In the above embodiment, the operations of the slide, the floating die table, the spoke hole forming die, and the like are all performed by the hydraulic cylinder, but they can be performed by using an electric device or other known driving means.

In the embodiments described above, the wheel hubs for bicycles have been described. However, the present invention can be similarly applied to wheel hubs for motorcycles and other spokes.

Effect of the Invention As described above, according to the present invention, the spoke holes of the wheel hub can be automatically opened and imposed by one press working machine, and the spoke holes of the flanges on both sides can be automatically formed as in the related art. This eliminates the need for centering and centering of the wheel, allows the spoke holes to be accurately drilled and imposed, and significantly improves the productivity of the wheel hub.

[Brief description of the drawings]

1 and 2 are a perspective view of a wheel hub according to an embodiment of the present invention and an enlarged sectional side view of a spoke hole portion, and FIGS.
The drawing is a vertical half sectional view of a press machine for explaining the opening and imposition described above, and a partially enlarged sectional view of a floating die table part, and FIGS. FIG. 1 ... wheel hub, 3 ... flange, 4 ... spoke hole, 5 ... imposition, 6 ... press machine, 8 ... lower mold, 9 ... slide, 10 ... upper mold, 11… Floating die table, 12… Hub material for wheels.

Claims (1)

(57) [Claims] 1. A hub material for a wheel of a bicycle or a motorcycle is mounted on a floating die table which is vertically movable between an upper die and a lower die of a press machine. Opening and imposing the spoke holes on one side are performed on the upper die and the upper surface of the floating die table, and opening and imposing the spoke holes on the other side of the hub material for the wheel are performed on the lower die and the floating die. A method for processing a spoke hole of a wheel hub, wherein the method is sequentially performed on a lower surface side of a table.