KR20190010002A - Manufacturing method of bracket for linear vibration motor - Google Patents

Abstract

The present invention relates to a manufacturing method of a bracket for a linear vibration motor for strengthening durability of the bracket (B) by reducing an outer diameter of a central portion (21) and enlarging a length after a central expansion step (S30) enlarging the central portion of a bracket circle (20) forming a vibration axis (A) after notching an outer portion with inserting a plate material. The manufacturing method of the bracket for the linear vibration motor comprises the steps of: inserting and punching a material; punching the outer portion and forming an outline of the bracket circle; widely expanding the center of the bracket circle; reducing the outline of the central portion and the diameter; enlarging the length; notching to form a coupling unit at the outer portion of the bracket circle; and taking out the bracket by cutting an outer joint part.

Description

Technical Field [0001] The present invention relates to a manufacturing method of a linear vibration motor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bracket for a linear vibration motor, more particularly, to a method of manufacturing a bracket for a linear vibration motor, which is manufactured by drawing a vibration shaft attached to a lower surface of a linear vibration motor case, ≪ / RTI >

In general, linear vibration motors are used in various fields such as communication devices such as mobile phones, earphones using bone vibration. Such linear vibration motors are being developed in various forms in order to improve vibration intensity, fall reliability, reaction speed, and the like.

Since the linear vibration motor is mounted on a smart phone or the like, the size and size of the linear vibration motor are becoming smaller and smaller. In addition to this miniaturization, the shape of the linear vibration motor is also evolving to improve space utilization.

Korean Patent No. 10-1746007 (Jun. 12, 2017) discloses a linear type vertical vibration motor including a magnetic field closed-circuit forming case.

1, an F-PCB 20, a coil 30, and a spring 40 are coupled to an upward protruding portion 11 of a yoke bracket 10, and a yoke case 80).

The yoke bracket 10 is coupled to the yoke bracket 10 and is formed as a lid opening toward the lower side to form a housing when engaged with the yoke bracket 10, And a yoke case (80) including a downward protruding portion (81) formed therein,

The yoke bracket 10 and the yoke case 80 form a magnetic field closed circuit around the upward protruding portion 11 and the downward protruding portion 81 when the yoke bracket 10 and the yoke case 80 are coupled to each other,

'형 중 선택된 어느 하나의 형상을 갖는 도전성의 서브요크(90)가 결합되거나, 상기 상향돌출부(11)와 상기 하향돌출부(81)의 외주연 둘레 및 상기 코일(30)의 상부 평면에는, 링형의 서브요크(90)가 결합되는 것을 특징으로 한다.The yoke case 80 is formed such that the diameter of the outer circumference of the downward protrusion 81 is less than the diameter of the outer circumference of the coil and between the upward protrusion 11 and the downward protrusion 81, 30, a flat-plate-like,

And a conductive sub yoke 90 having a shape selected from a ring shape or a ring shape is connected to the outer circumferential periphery of the upward projecting portion 11 and the downward projecting portion 81 and the upper plane of the coil 30, The sub-yoke 90 of the first embodiment is coupled.

However, there is a technical problem in that the upward protrusion 11 of the yoke bracket 10 is long, and the downward protrusion 81 of the yoke case 80 must be separately formed .

In addition, although the above-described conventional technique uses a forging process for forming the upper protruding portion 11 using only a thin plate material, the durability of the upward protruding portion 11 becomes weak, There was a problem of breakage.

In addition, in the above-mentioned prior art, the parts are damaged by excessive force of the press in the forging process, resulting in deteriorated productivity, and holes formed on the back surface of the bracket are irregularly formed and defects are frequently generated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and an object of the present invention is to provide a linear vibration motor for a linear vibration motor, And a method for manufacturing a bracket for a linear vibration motor that can be formed more rigidly than a bracket manufacturing method by a conventional forging method by drawing with a thin plate material.

According to another aspect of the present invention, there is provided a method of manufacturing a bracket for a linear vibration motor, the method comprising the steps of: A material pouring and piercing step of piercing a transfer hole at both sides; An outer punching step of sequentially transferring the material inserted in the material input and punching steps by a predetermined distance through the transfer hole and forming an outer shape of a bracket circle by punching an outer periphery of the material; A central expanding step of compressing the central part of the circular bracket formed by the vibration axis into an upper mold and a lower mold of the press so as to bend downwardly and to expand it; A diameter reducing step of reducing an outer diameter of the central portion expanded in the central expanding step; A length extending step of extending the protruding length of the center portion reduced in the diameter reducing step several times; A joint end notching step of notching the joint end so as to be formed on one side of the bracket circular shape formed in the length expansion step; And a product taking-out step of bending an end of the joint end of the bracket circular shape completed in the step of notching the joint end, and cutting the outer joint to take out the bracket.

The product taking-out step may include a forging step of pressing the bracket circular shape of the joint end notching step to strengthen the durability of the product, and a bending step of bending the end of the joint end.

In the diameter reducing step, the outer diameter and depth of the lower mold are gradually reduced so that the outer diameter of the center portion is reduced, and the punch length of the upper mold is the same as the depth of the lower mold.

The method of manufacturing a bracket for a linear vibration motor according to the present invention has the following effects.

First, a central expansion step of expanding the central part of the bracket circular shape formed by the vibration axis when the vibration axis of the bracket is formed by the drawing process by using the upper mold and the lower mold of the press is provided, It is prevented from being broken,

Second, the step of reducing the diameter of the center portion and increasing the length is performed by a predetermined distance so that the central portion of the bracket circle extended in the central expansion step is formed as the vibration axis of the bracket, The durability of the mold and the lower mold is improved,

Third, since the bracket circular shape is further subjected to a plurality of pressing and forging processes before being taken out to the bracket, the self-durability of the bracket is improved and the assembling property of the vibration motor with the upper case is improved,

Fourth, since the drawing process is performed in various stages in the vibration shaft forming of the bracket, the forging process is not required for forming the vibration shafts, and the inner holes of the vibration shafts are stably formed to break the parts and improve the product shape It is effective.

1 is a view for explaining a linear type vertical vibration motor according to the prior art,
2 is a perspective view illustrating a bracket according to the present invention,
3 is a flowchart of a method of manufacturing a bracket for a linear vibration motor according to the present invention,
4 is a view for explaining a bracket manufacturing method of the present invention,
FIG. 5 is a view for explaining the length expansion step, the notch-notching step and the product take-out step of the present invention,
6 is a view for explaining an upper mold and a lower mold for forming a bracket according to the present invention.

Hereinafter, a method for manufacturing a bracket for a linear vibration motor according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 6, the method for manufacturing a bracket for a linear vibration motor according to the present invention is a method for manufacturing a bracket B mounted on a bottom surface of a case of a linear vibration motor, A step S10 of loading and punching a material into which the plate-like material molded with the bracket B is inserted and piercing the transfer hole 10 at both sides; An outer punching step (S10) of transferring the material into the outer periphery of the workpiece by a predetermined distance through the transfer hole 10 and forming an outer shape of the bracket circle 20 S20); A central expanding step (S30) of pressing the central portion (21) of the bracket round (20) formed with the oscillation axis (A) with the upper mold and the lower mold of the press to bend downwardly and extensively; A diameter reducing step (S40) of reducing the outer diameter of the central portion (21) expanded in the central expanding step (S30); A length extension step (S50) of extending the protruding length of the center part (21) reduced in the diameter reducing step (S40) several times; (S60) of notching the joint end (22) so as to form an engagement end (22) on one side of the bracket round (20) formed in the length extension step (S50); A product take-out step (step S60) of bending the end of the joint end 22 of the bracket round 20 completed in the step S60 of cutting the joint end and cutting the outer joint part 23 to take out the bracket B S70).

The product taking-out step S70 includes a forging step S71 for pressing the bracket round 20 of the coupling end notching step S60 to strengthen the durability of the product, A bending step S72 is provided.

The forging step S71 is performed by pressing the upper and lower molds surrounding the outer surface of the bracket round 20 several times to enhance durability. In addition, the bending step S72 bends the end of the coupling end 22 at 45 degrees and 90 degrees twice at a time.

The diameter reducing step S40 gradually reduces the outer diameter R and the depth D of the lower mold so that the outer diameter of the center portion 21 is reduced as shown in FIG. The punch length L of the upper mold is the same as the depth D of the lower mold.

Meanwhile, the outer diameter of the lower mold used in the central expansion step S30 to the length expansion step S50 is gradually reduced, and the punch length L formed in the upper mold is as follows.

step Outside diameter of lower mold (R) Lower mold
Die Depth (D) Upper mold
Punch length (L) In the central expansion step (S30) 6.98 2.25 2.25 The diameter reduction step (S40) 5.0 1.85 1.85 3.5 1.75 1.75 In step S50, 2.66 1.85 1.85 2.06 2.0 2.0 1.66 2.1 2.1 1.31 2.27 2.27

That is, in the present invention, the upper mold and the lower mold are compressed and sequentially transferred using the transfer hole 10 to perform the respective steps.

In the central expansion step S30, the outer diameter R of the lower mold is maximized to increase the mass of the plate material constituting the vibration axis A, and the outer diameter of the lower mold in the length expansion step S50 R are smallest to form the actual size of the bracket B. [

The lower mold die depth D in the diameter reducing step S40 is smaller than the die depth D of the central expanding step S30 during molding of the vibration axis A, The amount of plate material required in the expansion step (S50) is secured, and breakage of the vibration axis (A) is prevented at the time of extending the length.

The operation of the method for manufacturing a bracket for a linear vibration motor according to the present invention having the above structure is as follows.

2 to 6, when the vibration axis A of the bracket B is formed by a press forming operation, the method for manufacturing a bracket for a linear vibration motor according to the present invention is characterized in that, The central portion of the circular shape 20 is widely extended, and then the plate-like material is prevented from being broken and the vibration axis A is drawn.

Specifically, in the material input and punching step S10, when the plate-like material constituting the bracket B is drawn, the transfer hole 10 is punctured on both sides of the plate-like material. The transfer hole 10 is formed to sequentially supply the plate-shaped material through the transfer device of the press.

Then, in the outer punching step S20, the plate material in which the transfer hole 10 is punched is punched around the bracket circle 20 formed by the bracket B to form an outer shape.

The central portion 21 of the bracket mold 20 formed in the outer punching step S20 is first expanded in the central expansion step S30. The center portion 21 is formed into the vibration axis A.

In the diameter reduction step S40, the outer diameter of the central portion 21 is reduced. At this time, the diameter reduction step S40 is a step of increasing the mass of the material constituting the vibration axis A of the bracket B to be.

The central portion 21 of the bracket circle 20 after the diameter reduction step S40 is performed to extend the length of the vibration axis A to a predetermined dimension in a length expansion step S50. That is, as shown in FIG. 5 (a), the length expansion step S50 can be easily increased to the number of the oscillation axes A due to the amount of material stretched in the diameter reduction step S40 .

The bracket round 20, which has been subjected to the length extension step S50, performs a notching process so as to form the coupling end 22 on the outer periphery thereof in the coupling end notching step S60. At this time, the coupling end 22 is formed so that the external terminals can be easily coupled.

The end of the coupling end 22 is bent twice in the product take-out step S70 and the outer concave portion 23 is cut to form the bracket B).

In the step S70 of taking out the product, a forging step S71 is performed for pressing the bracket circle 20 to enhance the durability of the product. Thus, the bracket B and the vibration axis A The durability is enhanced, which improves the durability of the linear motor.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
10: Feeding hole 20: Bracket round
21: center portion 22: coupling end
23: Outer horn
S10: Material input and punching step S20: Outline punching step
S30: central expansion step S40: diameter reduction step
S50: Extension of length step S60:
S70: Product take-out step S71: Forging step
S72: Bending step
A: Vibration axis B: Bracket D: Depth
K: fastening end L: punch length R: outer diameter

Claims (3)

A manufacturing method of a bracket (B) mounted on a bottom surface of a linear vibration motor and having an oscillation axis (A) protruded in the center,
A step S10 of injecting and punching a material into which the plate-like material molded with the bracket B is poured and piercing the transfer hole 10 at both sides;
An outer punching step (S10) of transferring the material into the outer periphery of the workpiece by a predetermined distance through the transfer hole 10 and forming an outer shape of the bracket circle 20 S20);
A central expanding step (S30) of pressing the central portion (21) of the bracket round (20) formed with the oscillation axis (A) with the upper mold and the lower mold of the press to bend downwardly and extensively;
A diameter reducing step (S40) of reducing the outer diameter of the central portion (21) expanded in the central expanding step (S30);
A length extension step (S50) of extending the protruding length of the center part (21) reduced in the diameter reducing step (S40) several times;
(S60) of notching the joint end (22) so as to form an engagement end (22) on one side of the bracket round (20) formed in the length extension step (S50);
A product take-out step (step S60) of bending the end of the joint end 22 of the bracket round 20 completed in the step S60 of cutting the joint end and cutting the outer joint part 23 to take out the bracket B (S70). ≪ / RTI > The method according to claim 1,
The product taking-out step S70
A forging step S71 for strengthening the durability of the product by squeezing the bracket round 20 of the coupling end notching step S60 and a bending step S72 for bending the end of the coupling end 22 Wherein said method comprises the steps of: The method according to claim 1,
The diameter reduction step (S40)
The outer diameter of the center portion 21 is reduced
Wherein the outer diameter (R) and the depth (D) of the lower mold are gradually reduced and the punch length (L) of the upper mold is the same as the depth (D) of the lower mold. Bracket manufacturing method.

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