Spring seat manufacturing method

Abstract

To provide a manufacturing method of a spring seat, more specifically, a manufacturing method of a spring seat to prevent problems such as cracks from being generated when forming high-tension steel for manufacturing the spring seat applicable to a high-load vehicle like an electric vehicle and to improve quality by reducing a material decrease rate.SOLUTION: A manufacturing method of a spring seat includes: a drawing step in which a working material is worked into a first shape which is upwardly bulged; and a reverse drawing step in which the first projected shape worked in the drawing step is pressed downward and worked into a second shape which is recessed with only material in the projected area.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a spring seat, and more particularly, to a method for manufacturing a spring seat for use in a high-load vehicle such as an electric vehicle, which prevents problems such as cracks that occur when forming high-tensile steel and reduces a material reduction rate to improve quality. [Background technology]

[0002] 2. Description of the Related Art In general, shock absorbers are used to improve the ride comfort by suppressing vibrations and shocks transmitted from the wheels to the vehicle body by using the elastic force of a coil spring and oil pressure within a piston.

[0003] At this time, in order to stably support the coil spring while minimizing the inflow of foreign objects such as stones, sand, and snow removal agent, the coil spring is provided with a spring seat at its end.

[0004] Such spring seats are manufactured by processing a steel sheet into a predetermined shape as disclosed in Korean Patent Publication No. 10-1998-0058866 entitled "Method of Processing a Spring Seat for a Shock Absorber for a Vehicle."

[0005] In recent years, as electric vehicles have become more popular, the load supported by shock absorbers has also increased significantly.

[0006] For this reason, spring seats are required to have higher rigidity, so high-tensile steel is used instead of ordinary steel plate, and their thickness has increased significantly, while their structural processing shape has become more complex.

[0007] On the other hand, high tensile steel has a problem in that it is less workable than conventional general steel sheets, and in particular, as the thickness increases, the difficulty in working increases.

[0008] In addition, the complexity of the shape means that the material loss rate is high during the processing, which causes a significant decrease in strength in the thinner areas.

[0009] Thus, there is a need for technological development to prevent defects such as cracks that occur during processing of high tensile steel and deterioration of processing quality due to a high material reduction rate. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-1998-0058866 Summary of the Invention [Problem to be solved by the invention]

[0011] The object of the present invention is to provide a method for manufacturing a spring seat that can reduce the material reduction rate while preventing cracks from occurring when forming high tensile steel. [Means for solving the problem]

[0012] In order to achieve the above object, the spring seat manufacturing method of the present invention is characterized by including a drawing process in which a workpiece material is processed into a first shape having an upwardly bulging form, and a reverse drawing process in which the convex portion of the first shape processed by the drawing process is pressed downward to process a second shape having a concave form using only the material of the bulging area.

[0013] The drawing step is characterized in that the edge of the material is pressed and deformed to form a bulged shape so that the material reduction rate at the center of the material is less than 30%.

[0014] The reverse draw process is characterized in that the convex portions are pressurized and deformed to form a concave shape so that the material reduction rate at each position of the second shape to be formed is less than 30%.

[0015] The reverse draw step is characterized in that the edge of the protrusion of the first shape is processed into a recess formed to be recessed downward while being placed in the center of the recess.

[0016] The reverse draw step is characterized in that a spiral sub-recess is further formed on the outside of the recess formed to be recessed downward. Effect of the Invention

[0017] As described above, according to the spring seat manufacturing method of the present invention, after forming a convex portion by the draw process, which performs the primary forming of the area to be processed by the draw process, the convex portion is processed so as to be concave downward while being centered by the reverse draw process, which performs the secondary forming into a concave shape, thereby preventing the occurrence of cracks when forming the high tensile steel and effectively reducing the material reduction rate. [Brief description of the drawings]

[0018] [Figure 1] 1 is a plan view showing a spring seat manufactured by a spring seat manufacturing method according to the present invention; [Diagram 2] 2 is a view showing the AA' line of the spring seat manufactured by the spring seat manufacturing method according to the present invention. FIG. [Diagram 3] 4 is a view showing the line BB' of the spring seat manufactured by the spring seat manufacturing method according to the present invention. FIG. [Figure 4] FIG. 2 is a diagram showing a first shape produced by a drawing step of the spring seat production method according to the present invention. [Diagram 5] FIG. 2 is a diagram showing a mode in which a manufactured first shape is processed by a reverse draw step of the manufacturing method of the spring seat according to the present invention. [Figure 6]FIG. 4 is a diagram showing a second shape produced by a reverse draw process of the spring seat production method according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Specific structural or functional descriptions of embodiments in accordance with the inventive concepts disclosed herein are merely exemplary for purposes of describing embodiments in accordance with the inventive concepts, which may be embodied in various forms and are not limited to the embodiments described herein.

[0020] Since the embodiments according to the concept of the present invention can be modified in various ways and can have various forms, the embodiments are illustrated in the drawings and will be described in detail herein, but it is not intended to limit the embodiments according to the concept of the present invention to the particular disclosed forms, and all modifications, equivalents, or alternatives falling within the spirit and technical scope of the present invention are included.

[0021] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] FIG. 1 is a plan view showing a spring seat manufactured by the spring seat manufacturing method of the present invention, FIG. 2 is a view showing line A-A' of the spring seat manufactured by the spring seat manufacturing method of the present invention, FIG. 3 is a view showing line B-B' of the spring seat manufactured by the spring seat manufacturing method of the present invention, FIG. 4 is a view showing a first shape manufactured by the draw process of the spring seat manufacturing method of the present invention, FIG. 5 is a view showing the form of processing the first shape manufactured by the reverse draw process of the spring seat manufacturing method of the present invention, and FIG. 6 is a view showing a second shape manufactured by the reverse draw process of the spring seat manufacturing method of the present invention.

[0023] The spring seat manufacturing method according to the present invention is for manufacturing a spring seat 100 as shown in FIG. 1 using a processed material such as high tensile steel.

[0024] More specifically, as shown in Figures 2 to 6, the process includes a draw process in which a flat-plate-shaped processed material 1 is pressed with a mold and processed into a first shape 2 having an upwardly bulging form, and a reverse draw process in which the first shape 2 processed by the draw process is pressed downwardly by a mold at the convex portion 11, and a second shape 3 having a concave form is processed using only the material of the bulging area.

[0025] At this time, it is preferable that the convex portion 11 formed in the drawing step is formed in consideration of the volume of material required for forming the concave portion 12 formed in the reverse drawing step.

[0026] That is, the protrusions 11 are formed so as to have a sufficient volume of material required when the recesses 12 are formed, in order to minimize the phenomenon in which the thickness of the material is reduced when the recesses 12 are formed.

[0027] In particular, the reverse draw process can be performed in one direction without the time required for turning over the processed first shape 2 or a separate process, thereby increasing productivity.

[0028] In addition, the drawing process forms the convex portion 11 in advance, taking into consideration the volume of material and the tensile strength of the material required for the concave portion 12 formed by the reverse drawing process. By forming the convex portion 11 in advance and then forming the concave portion 12 from the material corresponding to the convex portion 11, the material reduction rate of the concave portion 12 can be significantly reduced compared to when the concave portion 12 is processed all at once.

[0029] More specifically, in the drawing process, the edge of the blank 1 is pressed and deformed so that the material reduction rate at the center of the blank 1 is less than 30%, thereby forming a protrusion 11 having a bulged shape.

[0030] In the reverse draw process, the protrusions 11 of the first shape 2 are pressed and deformed to form a concave shape so that the material reduction rate at each position of the formed second shape 3 is less than 30%.

[0031] In particular, in the reverse draw process, the edge 11a of the protrusion 11 of the first shape 2 is processed while being placed in the center of the recess 12, which is formed so as to be recessed downward.

[0032] This effectively prevents the rate of material loss from increasing during the process of forming the recesses 12.

[0033] That is, by pressing in the material of the protrusions 11 when forming the recesses 12, the thickness of the material of the recesses 12 is effectively prevented from becoming thin.

[0034] In addition, a spiral sub-recess 13 may be further formed on the outside of the recess 12 formed to be recessed downward during the reverse draw process.

[0035] Although the present invention has been described above with reference to the accompanying drawings and focusing on the preferred embodiment, it will be apparent to those skilled in the art from such description that many variations are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should be interpreted by the claims written to include such many variations. [Explanation of symbols]

[0036] 1. Processing materials 2 1st shape 3 Second shape 11 Convex 12 Recess 13 Sub-recess

Claims

1. a drawing step of processing the workpiece into a first shape having an upwardly expanded form; A method for manufacturing a spring seat, comprising: a reverse drawing process in which a convex portion of the first shape processed by the drawing process is pressed downward to process a second shape having a concave shape using only the material of the expanded region, The reverse draw step includes: A method for manufacturing a spring seat, comprising: processing a recess formed so as to be recessed downward while fitting an edge portion of a first shape of protrusion into the center of the recess.

2. The drawing step includes:

2. The method for manufacturing a spring seat according to claim 1, wherein the edge of the processed material is pressurized and deformed into a bulged shape so that the material reduction rate at the center of the processed material is less than 30%.

3. The reverse draw step includes:

2. The method for manufacturing a spring seat according to claim 1, wherein the protrusions are pressurized and deformed to have a concave shape so that the material reduction rate at each position of the formed second shape is less than 30%.

4. The reverse draw step includes:

2. The method for manufacturing a spring seat according to claim 1, further comprising forming a spiral sub-recess on the outer side of the recess formed to be recessed downward.

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