Forging mold manufacturing process of towing bar

(a) Field of the Invention

The present invention is related to a manufacturing process of a trailer towing bar, and more particularly, to one that operates a forging mold to manufacture the towing bar.

(b) Description of the Prior Art

As illustrated in FIG. 6 of the accompanying drawings of the present invention, a towing bar 1 of the prior art is comprised of a gooseneck 2 and bar 3. Whereas the rod 3 is related to a hollow piece, the gooseneck 2 and a shank 3 are separately manufactured before welding both into one piece. However, the manufacturing process of the towing bar 1 consumes lengthy time and the towing bar 1 is vulnerable to break up at where the welding takes place in the event of poor welding quality or an object of excessively heavy weight is towed. The strength of the towing bar 1 is highly demanded since it has to tow a heavy object. Therefore the towing bar 1 is usually made of high strength steel; however, the inherited weight of the towing bar 1 makes its use and installation comparatively inconvenient.

To reduce the weight of the towing bar, aluminum material is used instead. To prevent insufficient strength of the aluminum material when made into a towing bar, the aluminum material is first forged into an integrated part of a blank and then drilled to become a hollow towing bar. However, this process causes massive waste of aluminum material to fail economic benefits and the drilling operation also requires additional process and increase production cost.

The primary purpose of the present invention is to provide a process operating a forging mold for manufacturing a towing bar to effectively upgrade manufacturing process efficiency of the towing bar while meeting the requirements of a hollow shaft of the towing bar and effectively saving material and time required for post-process.

To achieve the purpose, the present invention is comprised of the following steps:

a. Have a preheated and softened aluminum material in a mold containing a molding cavity, one end of the cavity is made in a contour of a gooseneck of the towing bar; and another end, a middle section of a shank of the towing bar;

b. An extension mold is connected to the mold and provided with an extension hole for molding an extended section of the middle section of the shank of the towing bar;

c. A punch performs forging on the aluminum material in the cavity externally from the extension hole; and

d. As extruded by the punch, the aluminum material extends in the direction of the extension mold for a preset length to complete molding of the towing bar.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plane sectional view showing a mold of the present invention.

FIG. 2 is a schematic view showing a layout of the present invention before forging an aluminum material.

FIG. 3 is a schematic view showing the aluminum material is forged in the present invention.

FIG. 4 is a sectional view showing a local part of a towing bar manufactured using the present invention.

FIG. 5 is a perspective view showing the towing bar manufactured using the present invention.

FIG. 6 is an exploded view showing the towing bar manufactured using the present invention.

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