KR101892353B1 - Method for manufacturing shield for shielding electromagnetic wave - Google Patents

Abstract

According to the present invention, an inner wall is caulked to a shield can after a shield can and an inner wall are processed together in a single progressive mold, productivity can be improved and production cost can be reduced, A method of manufacturing a shield for electromagnetic wave shielding that can completely perform the original function of electromagnetic wave shielding without using a progressive metal, A strip supplying step of supplying the can forming strip and the inner wall forming strip together in two rows separately, and a step of supplying the shield can forming strip and the inner wall forming strip, A shield can processing step of processing the shield can including the shield wall of the inner panel, An inner wall processing step in which a wall forming strip is processed into an inner wall of an 'A' shape while passing through the progressive metal step by step, and the inner wall processed by the inner wall processing step is moved through a moving pusher, An inner wall moving step of placing the inner can surface of the shield can in an inner upper surface of the shield cover processed by the can finishing step and a caulking engaging step of caulking the inner cover moved on the inner upper surface of the shield cover to the shield cover by caulking .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a shield for shielding electromagnetic wave shielding,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a shield for electromagnetic wave shielding which is provided so as to cover an electronic component mounted on a printed circuit board (PCB) built in various electronic apparatuses and which manufactures a shield for shielding electromagnetic interference.

In recent years, due to the rapid development of electronics and communication technologies, it has become technically possible to use unit circuits having various functions in a narrow space. In addition, electromagnetic interference (EMI), which causes malfunction of the device due to mutual interference of electromagnetic waves (EMW) generated from the respective circuits, occurs between neighboring circuits.

In addition to the problem of electromagnetic interference, electromagnetic waves generated from electronic devices have been reported to increase the temperature of biotissue cells due to the action of heat to weaken the immune function or to exert a bad influence on the human body such as gene deformation Therefore, the need for electromagnetic shielding has been emphasized in recent years to prevent the influence of electromagnetic waves on the human body.

Generally, electromagnetic shielding means shielding the electromagnetic waves from being transmitted through the shielding material between an external electromagnetic wave generating source and an object to be protected in order to protect an apparatus susceptible to human or electromagnetic waves. Means the degree to which the electromagnetic wave incident from the outside is attenuated by reflection, absorption, internal reflection, or the like in the medium.

As a conventional electromagnetic wave shielding method, there are a method of sealing a circuit for generating an electromagnetic wave with a conductive can (shield can), a method of preventing electromagnetic wave from leaking through a joint and a connection portion of a circuit partition member formed inside the electronic device A method of applying conductive silicon along a joint and a connection portion so as to form a circuit, and a method of shielding each circuit block by using a conductive shielding tape made to have the same shape as that of a partition line in a circuit are generally applied.

Of the electromagnetic wave shielding methods described above, the most widely used method at present is a method of using shields of conductive cans. As shown in Fig. 1, a metal plate or a synthetic resin (Fe, Cu, Ni, etc.) Shielded can 10 formed in the form of a can or a box by using a conductive material such as aluminum or the like on the upper surface of the circuit element 2 so as to shield the electromagnetic wave generated from the circuit element 2 Method.

Such a shield can 10 is generally manufactured by press-working a thin plate in the form of a box having only a lower portion thereof opened so as to cover the circuit element 2, as shown in FIG. That is, the shield can 10 includes a shield upper surface 11 corresponding to an upper surface and a shield side wall 12 forming a side wall.

At this time, various methods have been applied to fix the shield can 10 on the circuit board 1, and there are three methods, one-piece shield can system, clip shield can system and two-piece shield can system have.

For example, the one-piece shield can method is a method of fixing the lower end of the shield side wall 12 of the shield can 10 by brazing onto the circuit board 1 as shown in Fig. 3, a plurality of clips 15 are arranged on the circuit board 1 so as to surround the shield side wall 12 of the shield can 10, And then the shield side wall 12 of the shield can 10 is inserted into the plurality of clips 15 and fixed. On the other hand, in the two-piece shield can system, as shown in Fig. 4, a shielding frame 20 having a rim shape is formed on the circuit board 1 so as to correspond to the shape of the shielding sidewall 12 of the shielding can 10, 2), and then the shield side wall 12 of the shield can 10 is inserted into the shield frame 20 or fitted together.

There are advantages and disadvantages of the shield can fixing method by the above-mentioned various methods. Recently, however, the one-piece shielded can soldering method has been used for the ultra-thin pursuit with the reduction of the production cost and the simplification of the process. Also in the case of soldering, a method is used in which solder is preliminarily soldered on the circuit board 1, the shield can 10 is placed on the upper surface of the solder tin, and solder is automatically inserted into the soldering furnace in a high temperature atmosphere.

In recent years, in the case of a smart mobile phone, the circuit element 2 on the circuit board 1 has been reduced in size due to high integration, but the number thereof has increased for various functions, The mounting space of the circuit element 2 is reduced.

However, in recent years, due to the reduction in the mounting space of the circuit element 2, the number of the shield cans 10 is reduced, So that the circuit elements 2 can be shielded together to maximize the space efficiency.

For this purpose, as shown in Fig. 5, an inner wall 30 having a diaphragm shape is formed inside the shield can 10 to shield the respective circuit elements 2 therefrom. Two methods are used in the method of forming the inner wall 30 in the shield can 10. First, as shown in FIG. 5, a part of the shield upper surface 11 of the shield can 10 is cut As shown in FIG. 6, and a welding method in which a separate 'a' -shaped inner wall 30 is manufactured and then spot-welded.

Before explaining the merits and demerits of the inner wall bending method and the welding method, a progressive mold having a multistage connection structure is usually used in order to shape a strip to be fed continuously and stepwise as a general manufacturing method of the shield can 10. Therefore, in the case of the inner wall bending method, the inner wall 30 can be formed in one progressive mold because the incision process and the bending process for forming the inner wall on the progressive mold can be performed. However, since the electromagnetic wave shielding function is lost through the opening of the incised upper shield surface 11 and a cutaway section in which both ends of the inner wall 30 are not completely structurally connected to the shield side wall 12 occurs, It is difficult to perfectly perform the original function of shielding.

In addition, in the case of the inner wall welding method, there is an advantage that the original function of electromagnetic wave shielding can be completely performed without an opening to the shield upper surface 11 and the shield side wall 12 of the shield can 10, It is necessary to manufacture the inner wall 30 separately from the inner wall 30 and to perform the spot welding after positioning the inner wall 30 on the shield can 10, .

As described above, there is a need for a new method of manufacturing a shield for electromagnetic wave shielding to complement the disadvantages of the inner wall bending method and the welding method and to merit only the advantages.

SUMMARY OF THE INVENTION It is an object of the present invention, which has been devised to solve the above-mentioned problems, to provide a method of manufacturing a shielded can and an inner wall in a single progressive metal mold together with an inner wall, And it is an object of the present invention to provide a method of manufacturing a shield for electromagnetic wave shielding which can completely perform the original function of electromagnetic wave shielding without having an opening up to the shield upper surface or shield side wall of the shield can.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to accomplish the above object, a method of manufacturing an electromagnetic wave shielding shield according to the present invention is a method of manufacturing a shield for electromagnetic wave shielding by manufacturing a shield for electromagnetic wave shielding by processing a strip supplied continuously and stepwise through a progressive metal A strip supplying step of supplying the shield can forming strip and the inner wall forming strip together with the progressive mold separately in two rows, and a shield can forming strip having a shape of a can opening upwardly while passing through the progressive metal step by step And a shield can including a shielding cover and a shielding wall on a side surface of the inner wall forming strip, the inner can forming strip being formed by passing through the progressive metal step by step, And an inner wall machined by the inner wall machining step, And an inner wall moving step of causing the inner wall moved through the pusher to be seated on the inner upper surface of the shield cover of the shield can that is processed by the shield can processing step; And a caulking joining step for joining the cullet to each other.

Further, in the shield can forming step, a caulking hole is vertically passed through a shield cover of the shield can which the inner wall is moved and seated, And the caulking forming part of the inner wall is press-formed through a caulking die to perform caulking.

The caulking die may include an upper caulking die having a diameter larger than the caulking hole diameter of the shield cover and press-molding the caulking forming part of the inner wall from above, And a lower caulking die for supporting the caulking part of the month.

Further, the lower surface of the upper caulking die is a flat plane, and the upper surface of the lower caulking die is a convex surface rounded upward.

The cross-sectional thickness of the shield cover is 0.1 mm, the diameter of the caulking hole of the shield cover is 1 mm, the thickness of the inner wall is 0.15 mm, and the diameter of the upper caulking die is 1.1 mm.

The pressing depth of the upper caulking die with respect to the caulking part of the inner wall is 0.13 mm, and the distance between the upper end of the convex surface of the lower caulking die and the lower surface of the shield cover is 0.03 mm.

The manufacturing method of the shield for electromagnetic wave shielding according to the present invention can improve the productivity and reduce the production cost by joining the inner wall to the shield can after the shield can and the inner wall are processed together in one progressive mold, There is an effect that the original function of electromagnetic wave shielding can be completely performed without having an opening from the upper surface of the shield can or the shield side wall of the shield can.

Particularly, when the inner wall is caulked to the shield can, the optimum diameter of the caulking die, the pressing depth and the separation distance are secured with respect to the optimum thickness of the shield cover and inner wall through the caulking die having a specific structure, It is possible to provide a combined shield for electromagnetic wave shielding.

1 is a perspective view showing a state of use of a general shield for electromagnetic wave shielding,
FIGS. 2 to 4 are side cross-sectional views showing a soldering method, a clip or a frame inserting method of a conventional one-piece shield can,
5 is a perspective view showing an electromagnetic wave shielding shield manufactured by the conventional inner wall bending method,
6 is a perspective view showing an electromagnetic wave shielding shield manufactured by the conventional inner wall spot welding method,
7 is a flowchart showing an embodiment of a method of manufacturing an electromagnetic wave shielding shield according to the present invention,
FIG. 8 is a plan view showing a progress of the embodiment of FIG. 7 through a strip processed by a progressive metal,
FIG. 9 is a perspective view showing the pusher used in the inner wall moving step in the embodiment of FIG. 7,
FIGS. 10 and 11 are plan views showing the procedure of the inner wall moving step of the embodiment of FIG. 7,
12 is a side cross-sectional view illustrating the process of performing the caulking engagement step in the embodiment of FIG. 7,
13 is a side sectional view showing, in an enlarged scale, a specific state in which the caulking die is caulked when press-formed in the embodiment of Fig. 12,
FIG. 14 is a perspective view showing a shield for electromagnetic wave shielding finally manufactured through the embodiment of FIG. 7; FIG.

Hereinafter, preferred embodiments of a method of manufacturing a shield for electromagnetic wave shielding will be described in detail with reference to the accompanying drawings.

8 and 9, a method for manufacturing an electromagnetic wave shielding shield according to the present invention includes the steps of: forming a shield for electromagnetic wave shielding by manufacturing a shield for electromagnetic wave shielding by processing a strip supplied continuously and stepwise through a progressive metal The method includes a strip feeding step S100, a shield can forming step S200, an inner wall machining step S300, an inner wall moving step S400, and a caulking engaging step S500.

In the strip feeding step S100, the shield can forming strip 100 and the inner wall forming strip 200 are supplied separately in two rows by the progressive mold, as shown in Figs. 7 and 8, respectively. That is, the shield can forming strip 100 is continuously and stepwise transferred to the shape of the next shield can 300, and the inner wall forming strip 200 is also transported together with the shield can forming strip 100, (400).

7 and 8, when the shield can forming strip 100 passes through the progressive metal step by step, the shield can 310 (see FIG. 7) And a shielding wall 320 on the side.

In the inner wall forming step S300, the inner wall forming strip 200 is processed into the inner wall 400 of 'A' shape through the progressive metal step by step as shown in FIGS. 7 and 8 .

The shield can 300 from the shield can forming strip 100 is separated from the inner wall forming strip 200 from the inner wall forming strip 200 only by dividing the steps of the shield can processing step S200 and the inner wall processing step S300 The inner walls 400 are simultaneously machined from the progressive metal molds.

As shown in FIGS. 7 to 11, in the inner wall moving step S400, the inner wall 400 processed by the inner wall processing step S300 is moved through the moving pusher 500, And is seated on the inner upper surface of the shield cover 310 of the shield can 300 processed by the step S200. The moving pusher 500 may be a pneumatic cylinder embedded in the progressive mold and installed to be movable back and forth as shown in FIG. That is, after the shield can 300 and the inner wall 400 are processed, the inner wall 400 is seated on the inner upper surface of the shield cover 310 of the shield can 300 by the operation of the movement pusher 500 will be.

Finally, in the caulking joining step S500, the inner wall 400 moved to the inner upper surface of the shield cover 310 is caulked to the shield cover 310. The caulking joint is a joint that fills the gap by banging the head or joint of the rivet, which is also commonly referred to as a rivet joint. However, it is possible to perform coupling between the shield cover 310 and the inner wall 400 by using separate rivets or protrusions. However, in the present invention, it is essential to provide caulking within the thickness of the inner wall 400 to be.

10 and 12, the shield can 310 of the shield can 300, on which the inner wall 400 is moved and seated, is provided with a caulking hole 311, As shown in Fig. The caulking hole 311 of the shield cover 310 is to be caulked while being pressed and filled in the caulking formed part 410 of the inner wall 400 which is seated on the upper part. That is, in the caulking step S500, the caulking part 410 of the inner wall 400, which is seated on the caulking hole 311 of the shield cover 310, is press-formed through the caulking die 600 Calking.

The caulking die 600 in the caulking coupling step S500 has a diameter larger than the diameter of the caulking hole 311 of the shield cover 310 as shown in Figs. 12 and 13, And an upper caulking die 610 for pressing the caulking forming part 410 from above and a caulking forming part 640 of the inner wall 400 below the shielding cover 310 so as to face the upper caulking die 610 410 of the lower caulking die 620.

At this time, the lower surface of the upper caulking die 610 is flat and the upper surface of the lower caulking die 620 is a rounded convex surface. When the lower surface of the upper caulking die 610 presses the caulking formed part 410 of the inner wall 400 from above, the caulking formed part 410 of the inner wall 400 is deformed and pushed, The caulking hole 311 of the inner wall 400 is filled with the caulking hole 311 and the caulking hole 311 of the caulking cavity 410 of the inner wall 400 is further pushed and deformed, The transformation process can be done naturally.

13, in order to firmly engage the caulked portion 410 of the inner wall 400 with the shield cover 310 under the above-described caulking process, the cross-sectional thickness of the shield cover 310 The diameter of the caulking hole 311 of the shield cover 310 is 1 mm, the thickness of the inner wall 400 is 0.15 mm, the diameter of the upper caulking die 610 is 1.1 mm . In this case, the pressing depth of the upper caulking die 610 to the caulking formed part 410 of the inner wall 400 is 0.13 mm, and the upper end of the convex surface of the lower caulking die 620 and the upper end of the shield cover 310 ) May be 0.03 mm.

The shield for electromagnetic wave shielding according to the present invention finally manufactured by the above process is as shown in FIG. The inner wall spot welding method of the prior art shown in FIG. 6 has an excellent shielding function without causing a deterioration phenomenon between the opening of the shield cover 310 and the shield side wall 12, The shield can 300 and the inner wall 400 are formed at the same time in one progressive mold without performing a separate welding process, and the completion of caulking is completed, thereby securing a reduction in the production process and an improvement in productivity You can.

As described above, in the method of manufacturing shield for electromagnetic wave shielding according to the present invention, the shield can 300 and the inner wall 400 are processed together in one progressive mold, and then the inner wall 400 is formed on the shield can 300, It is possible to improve the productivity and reduce the production cost and to have an effect of perfectly performing the original function of electromagnetic wave shielding without opening to the shield upper surface 310 or the shield side wall 320 of the shield can 300 have.

Particularly when the inner wall 400 is caulked to the shield can 300 through the caulking die 600 having a specific structure, the thickness of the caulking die 600 relative to the optimal thickness of the shield cover 310 and the inner wall 400 It is possible to provide an electromagnetic wave shielding shield in which a high-quality inner wall 400 is combined by securing an optimum diameter, a pressing depth and a separation distance.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: Shielded can forming strip
200: inner wall forming strip
300: Shielded can
310: shield cover 311: caulking hole
320: shield wall
400: Inner wall 410: caulking part
500: moving pusher
600: caulking die
610: upper caulking die 620: lower caulking die
S100: Strip supply step
S200: Shield can processing step
S300: Inner wall processing step
S400: Inner month moving step
S500: Coking coupling step

Claims (6)

A method of manufacturing an electromagnetic wave shielding shield for manufacturing a shield for electromagnetic wave shielding by processing a continuously supplied strip through a progressive metal,
A strip supplying step of supplying the shield can forming strip and the inner wall forming strip together in two rows with the progressive mold separately,
A shield can forming step in which the shield can forming strip is processed into a shield can including a shield cover on a lower surface and a shield wall on a side surface in a can shape opening upward while passing through the progressive metal;
An inner wall processing step in which the inner wall forming strip is processed into an inner wall of an 'A' shape while passing through the progressive metal;
An inner wall moving step of moving the inner wall machined by the inner wall machining step through a movable pusher and seating the inner wall on the inner upper surface of the shield cover of the shield can made by the shield can forming step;
And a caulking engaging step of caulking the inner wall moved to the inner upper surface of the shield cover to the shield cover,
In the shield can processing step,
A caulking hole is vertically formed in the shield cover of the shield can which the inner wall is moved and seated,
Wherein the caulking-
Wherein the caulking formed portion of the inner wall seated on the upper portion of the caulking hole of the shield cover is press-molded through a caulking die to cause caulking.
delete The method according to claim 1,
Wherein the caulking die comprises:
An upper caulking die having a diameter larger than the caulking hole diameter of the shield cover and press-molding the caulking forming portion of the inner wall from above,
And a lower caulking die for supporting the caulking formed part of the inner wall below the shield cover so as to face the upper caulking die.
The method of claim 3,
The lower surface of the upper caulking die is flat,
Wherein the upper surface of the lower caulking die is a convex surface rounded upward.
5. The method of claim 4,
Wherein a cross-sectional thickness of the shield cover is 0.1 mm, a diameter of a caulking hole of the shield cover is 1 mm, a thickness of a section of the inner wall is 0.15 mm, and a diameter of the upper caulking die is 1.1 mm. A method of manufacturing a shield.
6. The method of claim 5,
Wherein the pressing depth of the upper caulking die with respect to the caulking forming part of the inner wall is 0.13 mm,
Wherein the distance between the upper end of the convex surface of the lower caulking die and the lower surface of the shield cover is 0.03 mm.

Images