JPS5939297B2 - Wheel manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a wheel.

Conventionally, wheels of automobiles, motorcycles, bicycles, etc. have been made of metal.

Although metal wheels are strong, they are heavy and have the problem of corrosion due to rust. If these wheels could be made of a lightweight, corrosion-resistant material such as reinforced synthetic resin (hereinafter referred to as FRP), the problems of product weight reduction and corrosion resistance could be solved at once. However, wheels made of FRP and the like still have problems in terms of strength, and have not been put into practical use. Therefore, an object of the present invention is to provide a method for manufacturing a wheel made of FRP or the like having sufficient strength.

In the method of the present invention, molds of the same shape are connected in series, and a wire material such as glass fiber impregnated with synthetic resin is wound around the space defined between the molds to form the original shape of the wheel. After shaping and hardening this original shape, the wheel is manufactured by cutting and punching.

The wheels targeted by the present invention include automobiles, motorcycles,
A wheel used for a bicycle, etc., as shown in Figure 1.
The wheel 10 is made up of a bearing boss section 110, a web section 12, and a flange section 13.

The flange portion 13 may be flat as shown in FIG. 1, but may be provided with protrusions 131 on both edges or curved radially inward as required, as shown in FIG. It may also be curved outward in the radial direction or C. Although not shown, the web portion 13 may also be provided with other patterns such as holes, grooves, and stripes. A mold for molding such a wheel is shown in FIG.

All of the molds 20 of the present invention have the same shape, and two molds serve as a pair. Molding mold 2
0 is made up of a boss portion 210, a main body portion 22, and a back portion 23. The boss portion 21 of one mold 20 engages with the back portion 23 of the other mold 20 to define a molding space 24 of a predetermined shape between both molds 20 . When a pattern is to be formed on the web portion of the wheel 10, a complementary pattern may be formed in the molding space 24. The molding space 24 molds the bearing boss portion 11 and the web portion 12 of the wheel 10. The wheel 1 is formed by the outside of the molding space 24, that is, the outer peripheral portion of the mold 20, and the outer shape shaping press 10, which will be described later.
0 flange portion 13 is molded. The mold 20 is the third
As shown in the figure, the shapes are such that they can be easily attached to and detached from each other, and a communication hole 25 is provided in the center.

A support shaft 50 or 50a, which will be described later, is inserted into the communication hole 25 to attach and detach the mold 20. Next, the principle of the method of the present invention will be explained with reference to FIG. 4 and subsequent figures.

As shown in FIG. 4, the wheel manufacturing method of the present invention includes a mold holding step 31, a winding step 32, a mold joining step 33,
Winding process 34, mold joining process 35, external shaping process 36
, curing process 37, cutting process 38, mold separation process 39,
The process consists of a product removal process 40. The details of each of the above-mentioned steps will be explained using an automobile wheel as an example.

A perspective view of the automobile wheel is shown in FIG. 5, and a longitudinal sectional view thereof is shown in FIG. This wheel 10a has a mounting hole 121 in the web portion 12, and a flange portion 1
3 is provided with a protrusion 131. This wheel 1
An example of a mold 20a suitable for manufacturing 0a is shown in FIGS. 7 and 8.

The rear portion 23 is provided with a projection 231 for forming an attachment hole, and the opposite front portion 26 is provided with a hole 261 for receiving the projection 231 of another mold. The communication hole 25 is provided with an enlarged diameter portion 251'15Z and supports the support shaft 5, which will be described later.
The mold 10 is engaged with the mooring protrusion 511 of 0 or 50a.
Useful for attaching and detaching a. The mold 20a may be an integral mold as shown in FIG. 7, or may be a split mold as shown in FIGS. 9 and 10. The functional characteristics of this split mold 520b will be described later with reference to FIG. 21. Next, each process shown in FIG. 4 will be explained with reference to FIG. 11 and subsequent figures.

FIG. 11 shows the mold holding step 31. In this step, the mold 20a is held at a predetermined position. The support shaft 50 is placed on standby opposite the boss portion 21 of the mold 20a. The support shaft 50 has a small diameter portion 51, a medium diameter portion 52, and a large diameter portion 53.
made of.

The tip of the small diameter portion 51 is rounded to facilitate attachment and detachment from the mold 20a. Furthermore, a mooring protrusion 511 that can freely appear and retract is provided near its tip.
The mooring protrusion 511 has a mechanism in which its protrusion and retraction are controlled by operation from the large diameter portion 53. ' The support shaft 50 has a function of being able to move in the axial direction and in a direction perpendicular to this.

In the standby state of the support shaft 50, the small diameter portion 51 is positioned coaxially with the communication hole 25 of the mold 20a and facing the bearing boss portion. Next, as shown in FIG. 12, by relatively moving the support shaft 50 or the mold 20a, the small diameter portion 51 of the support shaft 50 is inserted into the communication hole 25 of the mold 20a, and the mooring protrusion 511 is made to protrude. , the mold 20a is firmly fixed to the support shaft 50.

FIG. 13 shows the winding process 32. This process is the initial stage of winding. A plurality of wire rods 60 are passed through a synthetic resin supply nozzle 61 and wound onto the boss portion 21 of the mold 20a. The reason why the starting end of the wire 60 is wound around the boss portion 21 will become clear later, but it is simply because it is convenient for fixing the starting end of the winding around the mold 20a.

Therefore, if other suitable fixing means are provided, the starting end of the wire 60 can be attached to the outer periphery of the main body portion 22 or to the back portion 23.
The wire rod 60 may be wound around a protrusion 231 provided in the wire rod 60. The wire rod 60 may be made of glass fiber, vegetable fiber, mineral fiber, metal fiber, or the like.

The synthetic resin may be either a thermosetting resin or a thermosoftening resin. In the following description, it is assumed that glass fiber and thermosetting resin are used as a typical example. boss part 2
After a predetermined amount of wire 60 is wound around the support shaft 50, the support shaft 50 is pulled out from the mold 20a.

Another mold 20a is placed on the pulled out support shaft 50.
Attach as described in connection with the figures. When attaching and detaching the mold 20a to the support shaft 50, the extension and retraction of the mooring protrusion 511 is controlled remotely. FIG. 14 shows the mold joining step 33. In this step, as shown in FIG. 13, a first mold 20a partially wrapped with the wire 60 is joined to another second mold 20a in which the wire 60 is not wrapped tightly. As shown in the figure, the protrusion 231 of the second mold 20a penetrates the winding layer 62 of the wire 60 and engages with the hole 261 of the first mold 20a. Furthermore, the wound layer 62 of the wire 60 is sandwiched between the back portion 23 of the second mold 20a and the front portion 26 of the first mold 20a. In this way,
After the wire is firmly fixed between the pair of molds, the full-scale winding process 34 begins.

FIG. 15 shows the winding process 34. In this step, a plurality of wire rods 60 are inserted into the second mold 2 so as to cross each other.
The winding layer 6 of the wire is wound around the outer periphery and boss portion of 0a.
Mold 2. By cross-winding the wire 60,
Improves wheel strength. After the winding is completed on the second mold 20a, the third mold 20a is transferred to the second mold 20a.
Binds to 0a.

Furthermore, the wire 60 is wound around the third mold 20a.
In this way, the mold joining process 35 and the winding process 34 are repeated in sequence. A series of molds 20a during this process
is shown in FIG. The mold joining step 35 of joining the third mold 20a to the second mold 20a is substantially the same as the mold joining step 33 described in connection with FIG. 14. However, in the step 35, the winding layer 6 of the wire rod
This step is different from step 33 in that the bearing boss portion 11 and web portion 12 of the wheel original shape are shaped by sandwiching the wheel 2 between molds 20a. Figure 16 further shows the external shaping process 3.
6 and curing step 37 are shown. In the external shaping step 36, the wire rod 60 formed on the outer periphery of the two molds 20a is
The rolled layer 62 is pressed by an external shaping press 70 to shape the flange portion 13 of the original wheel shape. Curing process 3
Step 7 is to harden the original wheel shape after the external shaping. The original wheel shape hardens naturally by leaving it in the air.
From the viewpoint of improving work efficiency, it is preferable to perform forced rapid curing. For this purpose, the portion where the original shape of the shaping wheel exists may be passed through a normal heating furnace, or the shape shaping press 70 may be provided with a heater 80 to have a heating function, as shown in FIG. Even while the external shaping process 36 and the curing process 37 are being executed, the above-described winding process 34 and mold joining process 35 are repeated in sequence.

FIG. 17 shows the cutting step 38.

In this process, cutting lines are drawn around the outer circumference of the shaped and hardened wheel prototype. A conventional cutter 90 is used to make the cutting line. The cutter 90 rotates and revolves to cut a cutting line along the outer periphery of the original wheel. In this cutting process, even before the original wheel shape is completely solidified,
Cutting may be performed when the original wheel shape has solidified to such an extent that there is no problem in cutting the original wheel shape. After the cutting step 38, a mold separation step 39 is performed.

The preparation step 39 is shown in FIG. This preparatory step is substantially the same as the operation described in connection with FIG. In this case, the small diameter portion 51 of another support shaft 50a is inserted into the communication hole 25 of the first mold 20a, and the mooring protrusion 51
1 is engaged with the enlarged diameter portion 251. FIG. 19 shows the mold separation step 39.

By retracting the support shaft 50a to the right in the drawing,
First mold 20 with winding layer clot 63 of wire 60
a is separated from the second mold 20a. Roll layer crop 6
3, the first mold 20a is reused. FIG. 20 shows the product removal step 40.

In this process, the wheel 10 as a product, which is half attached to the second mold 20a, is removed from the second mold 20a manually or by a conventional extractor (not shown). The removed products are accumulated in a product storage area. FIG. 21 shows a mold separation step 39 when the split mold 20b shown in FIG. 10 is used.

As can be seen from the figure, since the first and second mold halves 20b can be separated with the wheel 10 sandwiched between them, this assembly can be treated as one unit and subjected to appropriate processing. can. For example, after separating the original wheel shape, shaping and hardening can be performed on another line. As is clear from the above explanation, according to the method of the present invention,
High-strength, lightweight wheels can be manufactured continuously using relatively simple equipment and operations.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a wheel to which the present invention is directed. FIG. 2 is a longitudinal sectional view of a modification of the wheel shown in FIG. 1. FIG. 3 is a longitudinal sectional view showing the principle of the mold used in the method of the present invention. FIG. 4 is a process diagram showing the principle of the method of the present invention. FIG. 5 is a perspective view of an automobile wheel to which the present invention is applied.
FIG. 6 is a longitudinal sectional view taken along the line in FIG. 5. FIG. 7 is a longitudinal sectional view of a mold used for manufacturing automobile wheels. FIG. 8 is a rear view taken from the - line in FIG. 7. FIG. 9 is an exploded longitudinal sectional view of the split mold. FIG. 10 is an assembled vertical sectional view of FIG. 9. FIG. 11 is an explanatory diagram showing the mold holding process. FIG. 12 is an explanatory diagram showing the connection state between the support shaft and the mold. FIG. 13 is an explanatory diagram showing the initial winding process. FIG. 14 is an explanatory diagram showing the mold joining process. FIG. 15 is an explanatory diagram showing the winding process. 16th
The figure is an explanatory diagram showing an external shaping process and a curing process. 17th
The figure is an explanatory diagram showing the cutting process. FIG. 18 is an explanatory diagram showing the preparation stage of the mold separation process. FIG. 19 is an explanatory diagram showing the mold separation process. FIG. 20 is an explanatory diagram showing the product removal process. FIG. 21 is an explanatory diagram showing another mold separation process when a split mold is used. 10: Wheel, 11: Bearing boss portion, 12: Web portion, 13: Flange portion, 20: Molding mold, 21: Boss portion, 22: Main body portion, 23: Back portion, 24: Molding space, 25: Communication hole, 251: Enlarged diameter portion, 50: Support shaft, 51: Small diameter portion, 52: Medium diameter portion, 5
3: Large diameter portion, 511: Mooring protrusion, 60: Wire rod, 61:
Synthetic resin supply nozzle, 62: winding layer, 70: external shaping press 80: heater, 90: cutter.

Claims (1)

[Claims] 1. Preparing a plurality of molds with a predetermined shape, holding the first mold in a predetermined position, wrapping the starting end of the wire around the first mold, and connecting the second mold to the first mold. winding the wire on the second mold; combining a third mold with the second mold to shape the wound layer on the second mold; sequentially repeating the bonding process and the winding process of the wire rod onto the mold, shaping the outer shape of the wound layer of the wire rod wound on the outer periphery of the mold, hardening the shaped wheel original shape, and curing the hardened wheel shape. The process of making a wheel consists of cutting a cutting line around the outer periphery of the original wheel, separating the first mold, taking out the product from the second mold, and repeating the steps of separating the mold and taking out the product in sequence. Production method.