KR20190072751A - Manufacturing method of bracket for vehicle seat - Google Patents

Abstract

The present invention relates to a method for manufacturing a bracket of a vehicle seat and, more specifically, disclosed is a technical field related to a method for manufacturing a bracket of a vehicle seat, which uses a progressive mold in a part of processes for manufacturing a bracket assembled to the rear side of a front bottom panel among parts of the vehicle seat to reduce work hours to reduce the manufacturing time and boost productivity. Moreover, since a wire hole is formed by using the progressive mold, only one set of molds is used in comparison with a tandem mold requiring a few of mold sets such that only one expensive press molding apparatus is installed. Accordingly, manufacturing cost and time can be reduced, the following forming steps are precisely performed, and a pilot hole is precisely formed, thereby providing an effect of increasing productivity. According to the present invention, the method comprises a hole forming step, first to fourth forming steps, and a curling step.

Description

Technical Field [0001] The present invention relates to a manufacturing method of bracket for vehicle seat,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a method of manufacturing a bracket for a vehicle seat, and more particularly, to a method of manufacturing a bracket for a vehicle seat by manufacturing a bracket to be assembled behind a front lower panel, , And a manufacturing method of a bracket for a vehicle seat that can reduce manufacturing time and productivity by reducing work flow.

BACKGROUND OF THE INVENTION [0002] Generally, a vehicle seat is assembled with many kinds of components, and a rear bracket is assembled at the rear of a front lower panel to form at least one electric wire hole through which electric wires are passed. And is formed by bending.

Such a rear bracket is generally manufactured by using a tandem mold. The tandem mold requires a plurality of presses and dies when a single component is manufactured by applying one process to one mold . A method of molding a product using such a tandem mold includes a method of placing a molded product on a mold of a next process using a robot, a method of using a hand directly by an operator, and a method of using a vacuum suction method.

However, in the case of molding a product using a tandem mold, the number of dies made of a punch and a die is large, and therefore the number of presses for operating the punch is also increased The number of molds and presses is increased and the number of workers is increased because the worker must be fixedly arranged for each press in order to operate the press.

In order to solve such a problem, as an example of a conventional technique of manufacturing an automobile part using a progressive mold, Korean Patent Registration No. 0794452 discloses "a method for forming a mounting bracket for a vehicle stabilizer bar ".

In the prior art, four holes are simultaneously drilled in the steel sheet when the steel sheet is inserted between the upper and lower molds in the piercing step, and the holes are arranged in the same line and continuously punctured at the same diameter.

Next, notching portions are formed on both sides of the center of the steel plate in a notching step. More specifically, notching portions are formed on one side of the steel plate to form the right bracket in the first notching step , A notching portion is formed on the other side of the steel plate o to form the left bracket in the second notching step.

Next, in the marking step, 'L' character marking is marked on the upper surface of the steel plate in a state of being fixed by the pilot pin installed on the bottom surface of the upper mold, and in this case, the pilot pins are inserted into the holes formed in the steel plate And the steel sheet is firmly fixed.

Next, bending portions are formed by bending protruding portions formed on both side portions of two steel plates continuously moving in a forming step, and then, in a restriking step, both side portions of the steel plate, that is, So as to assist the steel sheet to move to the next step.

Finally, in the cutting step, the side portion and the center portion of the two steel plates are cut, respectively. More specifically, in the first cutting step, each side portion of the steel plate is cut, and in the second cutting step, the center portion of the cut steel plate is cut, and after the second cutting step, The central cutting chip is detached. According to the manufacturing process of the prior art described above, the left and right brackets are simultaneously formed on the steel sheet material put into the press apparatus.

However, since the mounting bracket manufactured in the prior art has a small number of bent portions, it is easy to manufacture the same with a single progressive die. However, since the brackets according to the present invention, It is difficult to use the same progressive mold.

One example of a conventional technique for manufacturing an upper bracket of a seat back frame of a vehicle seat bracket with a bending portion as described above using a progressive metal is disclosed in Korean Patent Publication No. 2010-0073280 in "Progressive Mold, A method of manufacturing an upper bracket of a frame and an upper bracket manufactured by the method ".

The above-mentioned Japanese Patent Application Laid-Open No. 2010-0073280 has a portion which is not bent at the side portion, and the preform and the preforms of the subsequent stages are connected to each other by the bridge to produce the finished product as a progressive mold.

However, the present invention is a bracket to be assembled to the rear of a front lower panel among components of a vehicle seat which is difficult to form bridges. The bracket includes a bending step, which is a bending step, and a curling step, It is difficult to use a mold. Therefore, it is necessary to manufacture the steel plate by cutting the pre-grooves in the first steel plate and then to manufacture the steel plate through the tandem mold one by one.

Korean Patent No. 0794452 Korean Patent Publication No. 2010-0073280

The present invention has been made to solve the above-described problems in the prior art, and it is an object of the present invention to provide a bracket for a vehicle seat that includes a foaming step as a bending process and includes a curling step And it is a main object of the present invention to provide a manufacturing method of a bracket for a vehicle seat that can improve manufacturing time and productivity by manufacturing some processes using a progressive mold to reduce the number of workings.

In order to realize the above-described object, the present invention provides a method of manufacturing a molded product, comprising: a hole forming step of forming a wire hole in a metal plate to obtain a primary molded product; and a step of forming a bend in the primary molded product by moving the primary molded product after the hole forming step A second forming step of forming a first bending portion by bending the bent portion at a larger angle by moving the secondary molded product after the first forming step, A third forming step of moving the third molded product to finely bend the first bending portion to form a second bending portion, and a second piercing step of forming a plurality of pilot holes by moving the fourth molded product after the third forming step And a curling step of moving the fifth-order molded product after the second piercing step to bend the overall shape of the bracket. The deadline.

Further, the hole forming step of the present invention may include a first piercing step of forming a temporary hole in a metal sheet continuously fed to the progressive metal, and a second piercing step of expanding the temporary hole of the metal plate material after the first piercing step, A second burring step of bending the extension part of the temporary hole of the metal plate material after the first burring step to a larger angle and a second burring step of bending the extension part of the temporary hole of the metal plate material after the first burring step to a larger angle, And a bracketing step of obtaining a primary molded product by cutting the metal plate material after the step of lifting.

The first piercing step of the present invention is characterized in that at least one guide hole is formed on both sides of the metal plate.

As described above, in the method for manufacturing a bracket for a vehicle seat according to the present invention, by forming a wire hole by using a progressive metal, compared with a tandem mold requiring several sets of molds, By providing only one apparatus, not only the manufacturing cost and the manufacturing time can be reduced, but also the post forming step and the pilot hole can be formed more precisely, and the productivity can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a photograph showing an outer side of a bracket manufactured by a preferred embodiment of the present invention; FIG.
2 is a photograph showing the inside of a bracket manufactured according to a preferred embodiment of the present invention.
3 is a flowchart showing a procedure for manufacturing a conventional bracket;
4 is a flowchart showing a procedure for manufacturing a bracket manufactured according to a preferred embodiment of the present invention;
5 is a plan view illustrating a hole forming step of forming a wire hole according to a preferred embodiment of the present invention.
6 is a side sectional view showing a hole forming step of forming a wire hole according to a preferred embodiment of the present invention.
7 is a photograph showing a molded article after the brazing step according to a preferred embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bracket for a vehicle seat, and more particularly, to a method of manufacturing a bracket for a vehicle seat, in which a bracket (a lower panel FRT back bracket) (10) is first performed by using a progressive metal, so that a plurality of sets of tandem dies required for the process of forming the electric wire holes (10) can be reduced by using only one progressive die to reduce an expensive press device The manufacturing cost can be reduced and since the wire hole 10 is formed first, the error of the forming step before and after forming the wire hole according to the formation of the wire hole 10 can be reduced, And a method of manufacturing a bracket for a vehicle seat that can improve productivity by forming the piercing step more precisely.

In addition, the bracket to be assembled to the rear of the front lower panel among the components of the conventional vehicle seat has a bend shape as a whole as shown in the photograph of FIG. 1. Accordingly, the manufacturing method is a tandem mold, A primary molding step for primary bending, a primary step for forming a wire hole at the center, a piercing step for perforating the temporary hole, and a secondary step for forming a wire hole at the center A burring step of bending and expanding the extension part upwardly while expanding the provisional hole, and a third step of forming a wire hole in the center, the step of pushing the extension part to round the inner surface of the wire hole, A second forming step for the second bending of the preform, a third forming step for the third bending of the preform, Piercing step of drilling a hole in the preform and finally bend the whole shape is formed of a curling step.

That is, according to the present invention, it is possible to reduce the manufacturing cost and the manufacturing time by forming the wire hole 10 formed at the center first, but by performing the molding in one metal mold by using the progressive metal mold In addition, it is possible to obtain more accurate molding by reducing the error of the first bending occurring in the forming of the wire hole 10, which is performed after the first molding step for the first bending in the related art.

In order to accomplish the above-mentioned object, the present invention provides a method of manufacturing a semiconductor device, including: a hole forming step (S10) of forming a wire hole (10) in a metal plate to obtain a primary molded product; A first forming step (S20) of forming a bent portion in the primary molded product to form a bent portion; and a secondary forming step of moving the secondary molded product after the first forming step (S20) to bend the bent portion at a larger angle, (S30) of forming a second bending portion by moving the third molded product after the second forming step (S30) to finely bend the first bending portion to form a second bending portion (S30) A second piercing step (S50) of moving a fourth molded product after the third forming step (S40) to form a plurality of pilot holes (16); And a curling step (S60) of moving the fifth-order molded product after the second piercing step (S50) and bending the overall shape.

The hole forming step S10 of the present invention may include a first piercing step S11 of forming a temporary hole 12 in the metal sheet continuously fed to the progressive metal by piercing the temporary hole 12, A first burring step (S12) of expanding the provisional hole (12) of the metal plate material of the metal plate and bending the extension part (14) formed in accordance with the expansion in the upward direction; A second burring step S13 of bending the extension 14 of the provisional hole 12 of the metal plate to a greater angle and the extension of the provisional hole 12 of the metal plate after the second burring step S13, (14) forming a wire hole (10) by pressing and bending the portion (14); And a brazing step (S15) of cutting the metal plate material after the step of stripping (S14) to obtain a primary molded article.

The first piercing step S11 of the present invention is characterized in that at least one guide hole 20 is formed on both sides of the metal plate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown.

The present invention performs a hole forming step (S10) for forming a wire hole 10 without performing a brazing process for cutting a metal plate into a preform shape.

In addition, the hole forming step (S10) is a step of forming a wire hole (10) in a metal plate to obtain a primary molded product having the wire hole (10) In order to prevent the electric wire passing through the inner side of the electric wire hole 10, which has been cut and drilled, from flowing due to the movement of the seat or the movement of the vehicle and being damaged by the inner side surface of the electric wire hole 10, And burring and striping are performed so that the side faces are rounded.

In addition, the formation of the wire hole 10 was conventionally performed between the first and second forming steps, but in the present invention, the wire forming step was performed in the pre-forming step.

Therefore, in the hole forming step (S10) of the present invention, since the wire hole piercing and the first and second burring and the re-strike process are performed in the progressive mold in the pre-forming step, the work process is smooth and precise, Not only the realization of the effect that can be achieved but also the transferring process between the first forming step and the piercing step of the prior art, between the piercing step and the burring step, between the burring step and the re-strike step is omitted, Thereby realizing the effect of reducing the manufacturing time and improving the productivity.

Specifically, the hole forming step (S10) of the present invention first carries out a first piercing step (S11) of forming a temporary hole (12) in the metal sheet continuously fed to the progressive metal. The provisional hole 12 is smaller in size than the final formed wire hole 10 in order to form an extension portion 14 for burring and restriking.

At this time, in the first piercing step (S11), at least one guide hole (20) is punched together on both sides of the metal plate so that the metal plate is moved to the progressive metal so that the subsequent process steps can be precisely performed. When the process step is performed, the guide protrusion of the progressive metal passes through the guide hole 20 to fix the metal plate, thereby achieving the effect that each process step is precisely performed.

In the hole forming step S10 of the present invention, after the first piercing step S11, the metal plate is continuously moved in the progressive metal to expand the temporary hole 12 formed in the metal plate, A first burring step S12 for bending the extension part 14 in the upward direction is performed.

At this time, in the past, in the burring step corresponding to the first burring step (S12) of the present invention, the expanding part 14 is folded slightly outwardly. However, And further performs a second burring step (S13) to be described.

In addition, according to the present invention, a wire hole 10 can be formed more quickly by using a progressive metal as compared with a tandem mold when forming the wire hole 10.

That is, in the hole forming step S10 of the present invention, the extended portion 14 bent upward in the temporary hole 12 of the metal plate material after the first burring step S12 is formed in a larger angle, that is, And performs a second burring step (S13) for bending.

Thus, in the present invention, the size of the wire hole 10 is almost fixed, and the expanding portion 14 is brought into close contact with the upper portion of the metal plate in the step of re-strike S14, So that rounding is formed and damage to the electric wire can be prevented.

In addition, the second burring step S13 is characterized in realizing the effect that the expansion part 14 formed in the step of re-strike (S14) to be described later is smoothly pressed and pressed onto the metal sheet material .

The hole forming step S10 of the present invention is a step of forming the hole 14 of the temporary hole 12 of the metal plate material after the second burring step S13, that is, the outwardly bent extension part 14, And then pressing the metal sheet material on the upper surface of the metal sheet material, thereby performing the step of striping (S14) in which the electric wire hole 10 in which the inner side surface is rounded is formed.

In the hole forming step (S10) of the present invention, the metal sheet material after the step of stripping (S14) is cut into a conventional preform shape to obtain a primary molded article, thereby performing a brazing step (S15) To the formation of the wire hole 10 and the conventional brazing step.

That is, the electric wire hole 10 of the present invention is a passage for electric wires installed on the seat of the vehicle. When the size of the electric wire hole 10 is formed to be larger (more margin) than that of the pilot hole 16, The first piercing step S11, which is formed for the wire hole 10, has a second piercing step S11, which is formed for the pilot hole 16, The step of forming the wire hole 10 is performed in the previous stage of the first forming step S20 so that the first piercing step S11 and the first burring step S12 ), A deburring step (S13), a stepping step (S14), and a brazing step (S15) may be performed in a hole forming step (S10) performed with a progressive metal mold.

Thereafter, in the present invention, the primary molded product after the hole forming step (S10), that is, after the brazing step (S15), is moved to the tandem mold to form a bend in the primary molded product, A first forming step (S20) for obtaining a molded article of a car is performed.

Further, according to the present invention, the secondary molded product after the first forming step (S20) is moved to another tandem mold to bend the bent portion of the secondary molded product at a larger angle to form a first bent portion, A second forming step S30 is performed.

Further, according to the present invention, the third molded product after the second forming step (S30) is moved to another tandem mold to finely bend the first bending portion between the third molded products to form a second bent portion, A third forming step S40 is performed.

Thereafter, according to the present invention, the fourth molded product after the third forming step (S40) is moved to another tandem mold to form a plurality of pilot holes (16) in the fourth molded product, whereby the second piercing Step S50 is performed.

At this time, the pilot hole 16 must be formed at a precise position for the connection with the front lower panel, and the round hole is not required to be formed on the inner side like the wire hole 10, It is preferable to be performed at the last stage and be formed before the curling step S60, which will be described in detail later, so as to correct the bending error that can be caused by the formation of the pilot hole 16. [

That is, the present invention is characterized in that a curling step (S60) for finalizing the bracket is performed by moving the fifth-order molded product after the second piercing step (S50) to another tandem mold to bend the overall shape of the fifth- .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is possible to carry out various changes in the present invention.

10: Wire hole
12: Provisional Hall
14:
16: Pilot hole
20: Guide hole

Claims (3)

A hole forming step S10 of forming a wire hole 10 in a metal plate to obtain a primary molded product;
A first forming step S20 of forming a bent portion by bending the primary molded product by moving the primary molded product after the hole forming step S10;
A second forming step (S30) of moving the secondary molded product after the first forming step (S20) and bending the bent portion at a larger angle to form a first bending portion;
A third forming step (S40) of moving the third molded product after the first forming step (S30) to finely bend the primary bending portion to form a secondary bending portion;
A second piercing step (S50) of moving the fourth molded product after the third forming step (S40) to form a plurality of pilot holes (16); And
And a curling step (S60) of moving the fifth molded product after the second piercing step (S50) and bending the overall shape.
The method according to claim 1,
The hole forming step (S10)
A first piercing step (S11) of forming a temporary hole (12) by forming a metal plate continuously supplied to the progressive mold, and
A first burring step (S12) of expanding the provisional hole (12) of the metal sheet material after the first piercing step (S11) and bending the extension part (14) formed in accordance with the expansion in the upward direction;
A second burring step (S13) of bending the extension part (14) of the provisional hole (12) of the metal plate material after the first burring step (S12) at a larger angle;
A step S14 of forming a wire hole 10 by pressing and bending the extended portion 14 of the temporary hole 12 of the metal sheet material after the second burring step S13; And
And a bracketing step (S15) of cutting the metal plate after the step (S14) to obtain a primary molded product.
3. The method of claim 2,
The first piercing step (S11)
Wherein at least one guide hole (20) is formed on both sides of the metal plate.

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