JPH03128710A - Manufacture of car towing hook - Google Patents

Abstract

PURPOSE:To uniformalize the product quality through a simple processe by outputting a work from a material plate by means of punching, folding and putting one piece over another as specified to form a hook support, and welding the base to its one end. CONSTITUTION:By punching, a work is formed, in which parts (a) as shown in the attached illustration where one piece 1 is coupled with another piece 2 through junction 3 are joined symmetrically at a notch 7. Then a reinforcement edge 8 and reinforcement bead 9 are formed as illustrated respectively. One piece 1 of each work a, a is folded to the other piece 2 side at the junction 3 while the other piece 2 is folded at another notch 6, and the pieces 1, 2 are put one over another. The left and right works (a) are separated at the notch 7. A hook 11 is welded to each of them. This allows yielding the uniform product quality through the simple processe.

Description

DETAILED DESCRIPTION OF THE INVENTION A1.Object of the invention (industrial application field) The present invention relates to a method for manufacturing a tow hook for an automobile, specifically,
To provide a method for mass-producing uniform products at low cost by shaping a hook support from a single sheet of plate material through only three press processes and welding hooks thereto to obtain the product.

(Prior Art) A conventional automobile towing hook is made by separately forming a vertical piece 12 and an L-shaped piece 13, and spot-welding them so that their upper edges are aligned, as shown in Figure 7 of the drawing. After that, the vertical piece 12
A product as shown in FIG. 6 was manufactured by welding the base of the U-shaped hook 14 to the side.

(Problem to be Solved by the Invention) As in the conventional manufacturing method described above, the vertical piece 12 and the L-shaped piece 13
If you shape the bottom of the press separately and then join them together by welding, not only will the mold cost for the press, processing cost, management cost, and other costs be high, but the assembly cost will also be required, making the product expensive. Furthermore, when joining separate parts, even if precision is maintained using an assembly jig, there is a problem in that the products vary and complete uniformity cannot be expected.

The present invention was made in order to solve the above-mentioned conventional problems, and the hook support is completed by connecting one piece that holds the hook support and the other piece, and completing the hook support by pressing in only 3 steps. The object of the present invention is to provide a method of manufacturing a tow hook that can significantly reduce the manufacturing cost of the tow hook and completely uniformize the product by welding the hook to the tow hook.

1. Structure of the Invention (Means for Solving the Problems) The means of the present invention for achieving the above-mentioned object consists of a first step of punching out a material from a raw plate material, in which one piece and another piece are connected by a joint, and The second step is to form reinforcing bent edges and beads on one piece and the other, bend the one piece and the other piece from the joint and overlap them, and bend the other piece into an L shape from the middle part to support the hook. A method of manufacturing a tow hook for an automobile includes a third step of forming a body and a fourth step of welding a base of the hook to one side of the hook support.

(Function) In the method of the present invention described above, first, a pair of materials a and a, in which one piece 1 and another piece 2 are connected by a joint 3, are punched out of a raw material board as shown in FIG. , the side edges of one piece L and the other piece 2 in a are bent and raised as shown in Fig. 3 to form a reinforcing edge 8, and reinforcing beads 9 as shown in Fig. 3 are squeezed out on the board surface. to give sufficient mechanical strength to the materials a and a. The dog should be given the fourth material a, a.
As shown in the figure, bend from the joining part 3 and the middle part of the other piece 2, overlap a part of the other piece 2 with the piece 1 as shown in Fig. 5, and bend the other part horizontally at almost a right angle. Bend the other piece 2 into an L shape to form a pair of hook supports A and b. Then, when these hook supports S, b are separated from the middle boundary, a pair of hook supports S, B are completed. By welding the base of the hook 11 and allowing a tow rope to be hung on the upper part, a towing hook as shown in Fig. 1 can be manufactured efficiently, and the manufactured product will not cause any damage. There is no such thing.

Although the above-mentioned effect has been explained with reference to the two-cavity method for producing products with high processing efficiency, it is not necessarily limited to the two-cavity method, and it is also possible to adopt one or three or more molds. do not have.

(Example) Examples of the method related to the present invention will be described below based on the drawings.

In the drawing, a and a are a pair of materials, one piece 1 and the other piece 2 are connected by a joint part 3 as shown in Figure 2, and the two pieces are symmetrical so that they are connected at the terminal side of the other piece 2. It is formed by the first press step of punching out two pieces arranged in the same direction from the raw material plate. During this step, a hole 4 is made in the center of the joint 3 and notches 5 are made on both sides. A notch 6.6 is provided at the middle part of the side edge of the other pieces 2, 2, the depth of which matches the reinforcing edge to be described later. Make notches 7, 7, and make holes 4 and 5 as described above.
5 makes it easier to bend one piece 1 and the other piece 2 from the joint 3, the cut 6.6 makes it easier to bend the other piece 2 from the middle into an L shape, and the cut 7.7 makes it easier to bend the other piece 2 from the joint part 3. To enable accurate cutting when cutting pieces 2, 2 from a boundary part.

8 and 9 are reinforcing edges and reinforcing beads provided on one piece 1 and the other piece 2 of materials a and a, respectively, and the reinforcing edge 8 is on one piece 1.
In a second pressing process, the side edges of one piece 1 and the other piece 2 are bent and raised to the back side as shown in FIG. It is formed by
The purpose is to reinforce one piece 1 and the other piece 2, which lack mechanical strength because they are both made of plate material, to give both pieces sufficient mechanical strength.In this process, one piece 1 and the other piece 2 are Punch out bolt holes 10 for mounting to.

b and b are hook supports formed from the materials a and a described above, and are shown in FIG. Material a as shown in
, a begins to bend, and as shown in Fig. 5, part of the other piece 2 overlaps with the piece l, and the other piece 2 finishes bending from the middle to the side to form an L shape. It is formed by a process, and after this process is completed, the pair of supports S and B are cut at the position of the notch 7.7 provided at the connecting part of the other piece 2.2, and the pair of hook supports S and B are cut. , b is obtained.

11 is a hook, which is formed by bending a round steel bar into a U shape.
A piece 1 of the hook support plate with its base side shown in Figure 1.
A fourth welding step of welding to the upper side completes the towing hook which is connected to the support and on which the towing device is hung.

C1 Effects of the Invention As mentioned above, the method of the present invention allows formation of one piece of the hook support by connecting one piece to the other with only three press processes, resulting in excellent productivity and reduced mold cost for press. Processing costs, management costs, and other costs are about half that of conventional manufacturing methods, and there is no assembly cost, so product costs can be significantly reduced.

Since the hook support is completed by press working under uniform conditions and there is no cause for variation, it is possible to make all products completely uniform.

It has the following unique effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a tow hook manufactured by the method according to the present invention, Fig. 2 is a plan view showing the material obtained by the first step of the method according to the present invention, and Fig. 3 is a reinforced material obtained by the second step. A plan view of the material, FIGS. 4 and 5 are front views showing the formation process and completed state of the hook support in the third step, FIG. 6 is a perspective view of the towing hook manufactured by the conventional manufacturing method, and FIG. The figure is a perspective view showing the parts before assembly. a...Hook support 1...One piece 2, 3, 0 b, 11...Other pieces, joint, material, hook support, hook

Claims (1)

[Claims] The first step is to punch out a material from a raw board material where one piece and the other are connected at the joint, the second step is to form reinforcing bent edges and beads on one piece of this material and the other, and the joining of one piece and the other. While bending and polymerizing from the middle part, bend the other piece from the middle part to L.
A method for manufacturing a towing hook for an automobile, comprising a third step of forming a hook support by bending it into a shape, and a fourth step of welding a base of the hook to one side of the hook support.