2. Description of the Related Art Usually, wheels as high-speed moving means of cars rotates at a high speed while supporting tires and is exposed to various road circumstance and weather conditions having large changes. Thus, when the seismic center degree and the total precision are not good, they have disadvantages of increasing a continued ratio and generating vibration. The disadvantages reduce the lifetime of the moving means as well as, if anything should happen, if cracks occur at the wheel or the wheel is destroyed, large-sized safety accidents may be generated accordingly.

However, the wheel as the moving means has been make with the metal and through the welding, to the recent. After that, while 4 n an unitary wheel of the car or the motorcycle is produced by using aluminium dycasting processes, the production cost of the above wheel is expensive and thus, the purchase price thereof is also expensive. Therefore, the wheel is not universal. That is, to the now, the wheel made of the metal has been used widely and the wheel made of the metal has disadvantages as follows.

Most of all, processes for making the wheel with the metal will be described with reference to FIG. 2.

That is, an iron plate typed with a coil is cut to a proper length, the cut iron plate is passed through a roll bending equipment, and the passed iron plate is made with a pipe type.

Next, in the process of sticking both tips to each other with the welding, after an auxiliary plate 110 is sticked to both tips with the welding, the total welding processes are performed. Thereafter, after cutting the auxiliary plate 110 with a cutting torch, the welding unit and the cutting unit of the auxiliary plate 110 are applied with the grinding work by a grinder 120. Following that, first and second foaming works are applied to the plate through a foaming machine, thereby making final wheel.

By the way, the wheel made by conventional welding processes as stated hereinabove has following problems.

Namely, according to the prior art, after the plate rolls with a round shape and both tips are performed with the welding, the plate is firstly made with the pipe type. Secondly, the plate of the pipe type is made through the foaming process. Then, it takes a long time to produce the plate of achieving the first and second processes, it is difficult to work the plate, and finally, inferior goods may occur. Accordingly, it is hard to perform the large production by the unit time and especially, the defect phenomenon of the welding unit is a largest problem. For the reason of generating the defect phenomenon of the welding unit, the wheel has no even intensity and the possibility of generating the crack or the destruction at the wheel may be heightened in the case that the impact is applied to the wheel during driving. Also, since it is easy to generate crystallization variation of the material in the welding unit and the change in the centroid arises, the noise and the vibration may be generated, thereby having bad effect to various units of the moving means.

BRIEF DESCRIPTION OF THE DRAWINGS A more complete appreciation of this invention, many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which like reference symbols indicate the same or similar elements components, wherein, FIG. 1 is a view showing processes for making a wheel according to the present invention ; and, FIG. 2 is a view showing processes for making a wheel according to the prior art.

SUMMARY OF THE INVENTION It is-therefore an object of the present invention for solving the above problem to provide a method for making an unitary wheel without joint unit with the welding.

The above object can be achieved according to the present invention with a method for making a wheel as a moving means without welding, including : a first process of making a conventional iron plate with a mold, and forming a first expanding unit with a recess having a sunken interior and an edge ; a second process of punching the recess by using the mold, forming a hole, and eliminating a remainder, simultaneously ; a third process of penetrating the mold having the reverence equal to the diameter of the, recess into the hole of the recess, expanding the hole, and forming a second expanding unit made by simply varying bend of the first expanding unit ; a fourth process of forming a third expanding unit at an opposite portion of the second expanding unit by using upper and lower molds made of a couple, the molds having bends equal to those of the second expanding unit ; and, a fifth process of inserting a semiprocessed goods finished through the fourth process into a foaming machine and forming a desired bend.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be in. detail explained with reference to the accompanying drawings. Further, in the following description, the necessary description for understanding the present invention are set forth to provide a more thorough understanding of the present invention. It is noted that a detailed description of known functions and constructions unnecessarily obscuring the subject matter of the present invention has been omitted in the following description for clarity.

Firstly, a high tension iron plate is cut to a proper size and the cut plate is positioned between upper and lower molds formed with a couple. At this time, a groove is formed at the center of the upper mold and the bend equal to that of a first expanding unit is form at the edge thereof. Also, a protrusion is shaped at the center of the lower mold and the bend equal to that of the first expanding unit is formed at the edge thereof. Hereinafter, the molds used in the present invention are all formed with a couple.

A semiprocessed goods (i) performing the first process has a protrusion at the center thereof as shown in a first process of FIG.

1, the first expanding unit 11 is formed at the edge, and a remainder 13 exists at the outside of the first expanding unit 1.

Next, as depicted in a second process of FIG. 1, after the semiprocessed goods (i) is positioned between an upper mold which has a cutter protruded at the center thereof and the bend equal to that of the first expanding unit at the edge thereof, and a lower mold which has a hole at the center thereof and the bend equal to that of the first expanding unit at the edge thereof, the molds are operated so that a hole 12 can be formed at the center of a recess 10 as well as the remainder 13 can be cut, thereby producing a second semiprocessed goods (ii). Herein, it is regardless to call the upper and lower molds used in the above second process as the cutting mold.

Following that, as shown in a third process of FIG. 1, the second semiprocessed goods (ii) is placed at the lower mold and the upper mold falls down. At this point, since a circular protrusion A is formed with the reverence equal to the inside diameter of the recess 10 at the center of the lower mold, the protrusion A is penetrated through the hole 12 and expands the edge of the hole 12, in the case of matching the upper and the lower molds. Here, the bend equal to that of the second expanding unit 20 having simple bend in comparison with that of the first expanding unit 11 is shaped at the edge of the upper and lower molds, and the second expanding unit 20 is formed at the edge of a third semiprocessed goods (iii) of finishing the third process. Herein, the reason of simplifying the bends of the second expanding unit 20 is for making the foaming work to be easy in the final foam process.

Thereafter, as depicted in a fourth process of FIG. 1, after placing the third semiprocessed goods (iii) between upper and lower symmetric molds having at the edge thereof, the bend equal to that of-the second expanding unit, and matching the upper and lower molds, a fourth semiprocessed goods (iv) having symmetric second expanding unit is formed.

'Following that, as shown in a fifth process of FIG. 1, the processed good (v) having the second expanding unit varied as the desired bends is produced with being inserted into the foaming machine. Thus, the second expanding unit is a rim of the wheel.

Herein, the process according to the present invention is firstly finished, and because the process of finishing the rest of rims is equal to a conventional wheel process, the corresponding description is omitted hereinafter.

As may be apparent from the foregoing, the present invention corresponds to a process for making an unitary wheel without the welding as a moving means, by using the pressing process and the foaming process.

Therefore, the present invention has the effect on remarkably improving the productivity in term of the economy. Also, it nearly eliminates inferior generation element without the welding unit as well as provides the wheel having good intensity, the centroid, and the seismic center degree, thereby removing vibration and the noise of the tire during the driving. Accordingly, it can prolong the durability of the periphery elements of the wheel. Further, the wheel made in the present invention has good durability against the impact and removes the disadvantages of generating the crack at the wheel or of destroying the wheel under the impact, thereby improving safe driving.

While there have been illustrated and described what are considered to be preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for elements thereof without departing from the true scope of the present invention. In addition, many modifications may be made to adapt a particular situation to the teaching of the present invention without departing from the central scope thereof.

Therefore, it is intended that the present invention not be limited to the particular embodiments disclosed as the best mode contemplated for carrying out the present invention, but that the present invention includes all embodiments falling within the scope of the appended claims.