KR20020082028A - method to form the first in spring - Google Patents

Abstract

PURPOSE: A method for forming coiling starting part of a spring is provided to increase durability of spring by bending a flat coiling starting part in a "U" shape when manufacturing the spring using a plurality of frames operated together and a coiling rod. CONSTITUTION: In manufacturing an automobile spring comprising a coiling starting part, a line part and a catching bended part, the method for forming a "U" shaped coiling starting part of the spring comprises first step of transferring spring steel(100) to which high temperature heat is applied to the upper part of a coiling rod(10) through rollers; second step of bending the spring steel(100) in a "( )" shape by pressing the spring steel(100) through a pressing means such as a hydraulic cylinder in a first frame(110) formed on the upper part of the coiling rod(10); third step of bending the bended part in a "( )" shape by repeatedly bending a bended part bended in a "( )" shape in the second step through a pressing means such as a hydraulic cylinder in a second frame(120); and fourth step of bending the bended part in a "( )" shape (called as a "U" shape for explanation) by repeatedly bending a bended part bended in a "( )" shape in the third step through a pressing means such as a hydraulic cylinder in a third frame(130).

Description

Method for forming coiling start of spring {method to form the first in spring}

The present invention relates to a fabrication process for forming a "U" shaped coiling start in a spring mounted on a chair of an automobile.

In particular, by using a frame made to be interlocked by a pressure means such as a cylinder appropriately, the coiling (Coiling) starting portion of the spring is bent into a "U" shape to increase durability, and the coiling of the spring which improves the fastening property to the chair. Formation of the beginning.

In general, the spring is configured in the chair for the car to fold the back of the chair up to 180 degrees, and considered to be possible to return (return) is made of a coiling start, the body (line), the bending bent portion.

In the case of this conventional spring 5 the coiling start 3 is shown in Fig. 8 " The spring 5 of the form as shown in FIG. 7 is manufactured through the coiling operation wound around the coiling rod 1 of the " shape.

That is, the planar shape of the coiling start part 3 becomes a half moon shape.

In this case, as shown in FIG. 7, the bent portion 3 ′ bent at about 120 ° to 150 ° is formed at the coiling start portion 3.

Since the bent portion 3 'is bent at about 120 to 150 °, the spring steel, which is the material of the spring, is bent, and the bent portion is often made of fine cracks.

When the cracked spring 5 is mounted on the chair for a long time, a problem occurs in the elastic force, and a crack part of the bent portion 3 'is broken and the spring needs to be replaced.

In addition, when one side of the half-moon ball 2 of the coiling rod (1: shown in Fig. 8) during the manufacturing process of the conventional spring has also occurred in unusual circumstances.

Therefore, summarizing the above-mentioned contents, it can be inferred that the conventional technology has the following special problems.

First, the problem of the spring itself produced by the prior art

When forming the bent portion cracks (crack) is seen a lot of problems in durability.

Second, problems in the manufacturing process

When the spring is produced, many of the loads are caught on the coiling rod during twisting of the spring line, and thus the coiling rod breaks frequently.

The present invention is to increase the durability of the spring by bending the planar shape of the coiling start to the "U" shape when manufacturing the spring using a plurality of interlocking frame and coiling rod.

1 is a view showing a first step of the manufacturing method of the present invention

2 is a view showing a second step of the manufacturing method of the present invention;

3 is a view showing a third step of the manufacturing method of the present invention;

4 is a view showing a fourth step in the manufacturing method of the present invention;

Figure 5 is a perspective view showing one embodiment of a spring forming the "U" shaped coiling start of the present invention

Figure 6 is a perspective view showing another embodiment of the spring forming the "U" shaped coiling start of the present invention

Figure 7 is a perspective view showing the appearance of a spring forming a conventional "half-moon" coiling start

8 illustrates a method of forming a conventional "half-moon" coiling start.

The present invention is to form a coiling start portion of the "U" shape during the manufacturing process of the spring for the vehicle consisting of the coiling start portion, the line portion, the locking bent portion is composed of the following steps.

First step: the spring steel 100 is applied to the upper end of the coiling rod 10 to the upper end of the coiling rod 10 is transferred to the top of the coiling rod 10

Second step: The first frame 110 formed on the upper portion of the coiling rod 10 presses the spring steel 100 through the pressing means (hydraulic cylinder, etc.) "Steps to bend into molds

Third Step: In the second step, the second mold 120 is pressed through the pressurizing means (hydraulic cylinder, etc.) "Bending over the bent portion in the shape repeatedly" "Steps to bend into molds

Fourth Step: In the third step, the third frame 130 is pressurized through a pressurizing means (hydraulic cylinder, etc.). "Bent over and over again the bent part in the shape" To bend into a "shape (referred to as a" U "shape for illustration)

The method outlined above will now be described in detail with the drawings shown.

The coiled spring steel 100 in a convenient form is cut to an appropriate size.

The first end of the spring steel 100 thus cut enters a preparatory step for forming a "U" shaped coiling start 11 by being heated and heated at a high temperature.

First step: the spring steel is heated to the top of the coiling rod is transferred to the top of the coiling rod at the first stage (Fig. 1)

The spring steel 100 is cut to an appropriate size and approaches the upper end of the coiling rod 10 by riding the roller 101 shown in FIG. 1.

The approaching spring steel 100 stops at a suitable position and waits for the next process.

Figures 1 to 4 (a), (b) shows the bending process for the formation of the coiling start, respectively, in particular, the drawing shown in (b) shows the shape of the bending formed through each step .

Second step: The first frame formed on the upper part of the coiling rod presses the spring steel through the pressing means (hydraulic cylinder, etc.) To bend to form " (FIG. 2)

The first frame 110 configured to press the spring steel 100 at the upper portion of the coiling rod 10 and stopped at an appropriate position through the first step.

The spring steel 100 is bent as shown in FIG. 2 by the pressing of the first mold 110 which maintains the same surface as the shape of the outer circumferential surface of the coiling rod 10.

That is, the pressing means pushes the first mold 110 at high pressure to bend the spring steel placed between the coiling rod and the first mold.

The pressurizing means may be a hydraulic cylinder or the like.

3rd step: The 2nd frame is pressurized by means of pressurizing means (hydraulic cylinder, etc.). "Bending over the bent portion in the shape repeatedly" "To bend into molds (FIG. 3)

Going through phase two, As shown in FIG. 3, the spring steel 100 bent in a “shape” is pressed by the second frame 120 formed on the left side of the coiling rod 10.

The pressurizing means of the second mold 120 is also generally used a hydraulic cylinder.

In other words, " "Pressing the bending portion bent in the form again with the coiling rod 10 between Bend to the mold.

4th step: In the 3rd step, press the 3rd frame through the pressurizing means (hydraulic cylinder, etc.). "Bent over and over again the bent part in the shape" To bend into "shape (referred to as" U "shape for illustration) (FIG. 4)

Going through the third step, The coiling start 11 of the present invention bent in the form of "is pressed using another separate frame (third frame: 130).

As a means of this pressurization, a hydraulic cylinder etc. are also used.

4 illustrates the pressurization in detail. The third frame 130 presses the spring steel 100 tightly tightened by the first and second frames 110 and 120 again through the pressing means. "Bending to the mold.

Of this coiling start 11 The "type bending part" is called "U 'shape for convenience.

The coiling start portion 11 of the "U" shape has a bending angle of more than 90 degrees as shown in FIGS. 5 and 6.

Therefore, it is possible to minimize the occurrence of gold often appear during the 120-160 degree bend manufacturing process of the conventional spring (shown in Figure 7).

Through the above steps, the spring steel 100 formed with the "U" shaped coiling start 11 is manufactured by the spring 20 by a known manufacturing method.

That is, the spring steel having the "U" shaped coiling start 11 is rotated about the coiling rod 10 and twisted as many times as necessary to produce one completed spring (shown in FIGS. 5 and 6).

Of course, the known locking bent portion 12 also includes a process of bending.

In the drawing, P denotes a pitch between a line and a line forming a line part (body) of a spring.

The coiling start of the "U" shaped formed by the manufacturing method of the present invention is an easy invention to increase the durability of the spring itself.

The spring produced by such a manufacturing method is easy to fasten to the chair, the defect rate is low, it can also bring down the production cost.

Claims (1)

Method of forming a "U" shaped coiling start portion consisting of the following steps in the manufacturing process of the spring for the vehicle consisting of the coiling start portion (11), the line portion (15), the locking bent portion (12). First step: the spring steel 100 is applied to the upper end of the coiling rod 10 to the upper end of the coiling rod 10 is transferred to the top of the coiling rod 10 Second step: The first frame 110 formed on the upper portion of the coiling rod 10 presses the spring steel 100 through the pressing means (hydraulic cylinder, etc.) "Steps to bend into molds Third step: In the second step, the second frame 120 is pressurized by a pressurizing means (hydraulic cylinder, etc.). "Bending over the bent portion in the shape repeatedly" "Steps to bend into molds Fourth Step: In the third step, the third frame 130 is pressurized through a pressurizing means (hydraulic cylinder, etc.). "Bent over and over again the bent part in the shape" To bend into a "shape (referred to as a" U "shape for illustration)