KR101779894B1

KR101779894B1 - Method for manufacturing pem nut

Info

Publication number: KR101779894B1
Application number: KR1020150065847A
Authority: KR
Inventors: 현종화; 원영희
Original assignee: (주)한일포밍; 원영희
Priority date: 2015-05-12
Filing date: 2015-05-12
Publication date: 2017-09-19
Also published as: KR20160133157A

Abstract

According to the present invention, there is provided a method of manufacturing a Pem nut, comprising: a first molding step of forming a first finished product having a predetermined shape by curving a bottom edge portion of a round bar-shaped object; A second shaping step of shaping a first hole having a predetermined depth to the upper side of the first workpiece and simultaneously forming a second workpiece having an outer diameter reduced portion formed by reducing the outer diameter downward; A third shaping step of pressing the second workpiece to extend the outer diameter reduction section downward to produce a third workpiece having the extension section formed between the first hole and the outer diameter reduction section; And a fourth molding step for molding a second hole having a predetermined depth below the first hole to produce a fourth processed product. In the third molding step, the expanding part is formed by machining the cross section of the outer peripheral surface into a polygonal shape To provide a method of manufacturing a Pam nut.
Therefore, there is an effect that it is possible to prevent excessive loss of raw materials in the manufacturing process.

Description

Method for Manufacturing Pem Nut}

More particularly, the present invention relates to a method for manufacturing a pom nut using a cold forging method capable of reducing loss of raw materials generated in a manufacturing process and increasing productivity .

Pam nuts are fasteners that allow parts to be easily joined to a thin plate or panel, such as a frame mounted inside a display device (eg, a computer, a notebook, or a TV), an inner plate or a back cover, and to withstand a strong impact or load.

But. In the case of the conventional turning method, there is a problem in that excessive raw materials are added to the final product because the raw materials in the manufacturing process are excessively lost.

Particularly, in the case of the turning method, the cutting tool is abraded due to repetitive use, which makes it difficult to process the raw material into a workpiece having a uniform size, thereby making it difficult to secure quality.

In addition, the turning method has a problem in that high-speed production is difficult because it takes a long processing time to process an object as a final product.

Also, in the case of hot forging or hot forging, there is also a problem in that productivity is greatly reduced due to complicated processes from input of raw materials to obtaining final output products.

Therefore, it is disadvantageous that the efficient production of the Pam nuts is not easy.

Korean Patent No. 10-1475600

An object of the present invention is to provide a manufacturing method of a pom nut which can prevent an excessive loss of raw materials in a manufacturing process.

Another object of the present invention is to provide a manufacturing method of a pom nut which can easily produce raw materials with uniform dimensions and obtain high quality products.

Another object of the present invention is to provide a manufacturing method of a pam nut having a simplified manufacturing process in comparison with a turning method, a hot forging and a hot forging method.

The present invention relates to a method for manufacturing a Pem nut, comprising: a first molding step of forming a first finished product having a predetermined shape by curving a bottom edge portion of a round bar-shaped object; A second shaping step of shaping a first hole having a predetermined depth to the upper side of the first workpiece and simultaneously forming a second workpiece having an outer diameter reduced portion formed by reducing the outer diameter downward; A third shaping step of pressing the second workpiece to extend the outer diameter reduction section downward to produce a third workpiece having the extension section formed between the first hole and the outer diameter reduction section; And a fourth molding step for molding a second hole having a predetermined depth below the first hole to produce a fourth processed product. In the third molding step, the expanding part is formed by machining the cross section of the outer peripheral surface into a polygonal shape To provide a method of manufacturing a Pam nut.

Further, in the third molding step, the enlarged portion may have a hexagonal cross-section of the outer peripheral surface.

Also, the third molding step may include a third molding step for molding the first guide hole below the first hole.

Further, in the fourth molding step, the second hole may be formed into the expanded portion through the first guide hole.

Further, in the fourth molding step, the outer diameter reduction portion can be extended downward together with the molding of the secondary hole.

The fourth forming step may further include a fourth forming step of forming a flange portion extending upward from the upper edge portion by setting up an upper edge portion of the third workpiece .

Further, the method may further include a cutting step of cutting the material to be cut into a predetermined length to prepare an object.

The method of manufacturing the Pam nuts according to the present invention has the following effects.

First, excessive loss of raw materials in the manufacturing process can be prevented.

Second, as a cold forging method, a raw material can be processed with a uniform size more easily than a cutting method, and a product having excellent quality can be obtained.

Third, the manufacturing process can be simplified in comparison with the conventional hot forging or hot forging method, and productivity can be improved.

1 is a flowchart sequentially illustrating a method of manufacturing a Pam nut according to an embodiment of the present invention.
2 is a schematic view showing a process corresponding to the cutting step of the manufacturing methods according to FIG.
FIG. 3 is a cross-sectional view showing a raw material cut according to FIG. 2. FIG.
FIG. 4 is a schematic view showing a process corresponding to the first molding step among the manufacturing methods according to FIG. 1. FIG.
5 is a cross-sectional view of the primary workpiece produced according to FIG.
FIG. 6 is a schematic view showing a process corresponding to the second molding step among the manufacturing methods according to FIG. 1;
Fig. 7 is a cross-sectional view of the secondary workpiece molded according to Fig. 6;
FIG. 8 is a schematic view showing a process corresponding to the third molding step among the manufacturing methods according to FIG. 1. FIG.
Fig. 9 is a cross-sectional view of a third processed product manufactured according to Fig. 8; Fig.
FIG. 10 is a schematic view showing a process corresponding to a third-order molding step of the manufacturing methods according to FIG.
11 is a cross-sectional view showing a third processed product manufactured according to Fig.
12 is a schematic view showing a process corresponding to a fourth molding step of the manufacturing methods according to FIG.
Fig. 13 is a cross-sectional view showing a fourth processed product molded according to Fig. 12. Fig.
14 is a schematic view showing a process corresponding to a fourth-order molding step of the manufacturing methods according to FIG.
Fig. 15 is a sectional view showing a fourth processed product manufactured according to Fig. 14; Fig.

It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. The scope of technical thought is not limited to the following examples. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the scope of the invention to those skilled in the art. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. The same reference numerals denote the same elements at all times. Further, various elements and regions in the drawings are schematically drawn. Accordingly, the technical spirit of the present invention is not limited by the relative size or spacing depicted in the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a flow chart showing a method of manufacturing a Pam nut (S100) according to an embodiment of the present invention, and FIGS. 2 to 15 are views showing processes and workpieces according to the respective steps of FIG.

First, the raw material (M) to be fed into the cutting mold (C) is cut at a predetermined length or a predetermined weight in the cutting step to prepare for molding. More specifically, the raw material M is cut using a cutting mold C including a hollow lower body C2 and a hollow upper body C1 positioned above the lower body C2. At this time, the raw material M to be cut may include a round bar shape. That is, after cutting the metal mold C, the lower body C2 and the upper body C1 are coaxially positioned, the upper body C1 is moved in the horizontal direction, So as to prepare a bar-shaped object. (See Figs. 2, 3, and S110)

Here, the raw material M is supplied by a separate feeding device. The cutting metal mold C feeds the raw material M to be fed through a combination of a dice, a knife, a stopper, a pusher, ) Can be performed to prepare an object.

Next, in the first molding step, the lower edge portion of the cut raw material M1 is curved and molded to manufacture the first finished product 110. [ Through this, the broken end of the cut raw material M1 generated in the cutting process can be broken through the first punch pin 11a. (See Figs. 4, 5 and S120)

Meanwhile, in order to process the object in the first molding step, the raw material M1, which is cut in the cutting step, is fed to a first forming machine by a predetermined feeding means (e.g., a gripper type carrier) To the first mold (13) of the first dice (120). The same method can be applied to the transfer of each workpiece corresponding to the object between the cutting step and the fourth molding step described later.

Next, in the second molding step, the first hole 121 is formed at a predetermined depth above and below the first processed product 110, and at the same time, the outer diameter is reduced downward, Thereby producing the second processed product 120. (See FIGS. 6, 7 and S130)

For this purpose, in the second molding step, the first finished product 110 transferred to the second mold 23 of the second die 22 is transferred to the second die spindle 22a of the second die 22, The second punch pin 21a of the second punch portion 21 is pressed. The second mold 23 is formed so that the inner lower portion has a smaller inner diameter than the upper portion, so that the outer diameter reduced portion 122 can be formed below the first processed product 110. A tapered portion may be formed between the upper portion and the lower portion of the second mold 23. (See FIGS. 6, 7 and S130)

Here, the second auxiliary punch pin 21b may be provided around the outer peripheral surface of the second punch pin 21a. The second auxiliary punch pin 21b can push the second finished workpiece 120 subjected to the second forming process from the second punch pin 21a to facilitate separation. (See Fig. 6)

Next, in the third molding step, the second workpiece 120 is pressed to extend downward the outer diameter reduction portion 122, and the extension portion 123 is formed between the first hole 121 and the outer diameter reduction portion 122, Thereby forming a molded third processed product 130. [ (See Figs. 8, 9 and S140)

The third workpiece 120 received in the third die 33 of the third die part 32 is moved to the third die spindle 32a and third die 32b of the third die part 32, And is pressed by the third punch pin 31a of the punching portion 31. [ That is, the expanding portion 122 can be formed in the process of pushing the inside of the first hole 121 to extend the downwardly extending portion 122 of the third punch pin 31a. (See Figs. 8 and 9)

The third metal mold 33 may have a polygonal shape corresponding to the expanded portion 122 and an outer peripheral surface corresponding to the extended portion 122. Among these polygonal shapes, it is preferable to form the hexagonal shape. (See Figs. 8 and 9)

A separate fixing pin 32b is provided between the outer diameter reduction portion 122 of the second processed product 120 accommodated in the third mold 33 and the third die spindle 32a in order to manufacture the third processed product 130. [ . The fixing pin 32b may be formed to correspond to the shape of the outer diameter reducing portion 122. The fixing pin 32b may be provided separately or may be formed integrally with the third die spindle 32a. 8 and Fig. 9)

Here, a third auxiliary punch pin 31b may be provided around the outer circumferential surface of the third punch pin 31a. The third auxiliary punch pin 31b can push the third finished product 130 subjected to the third forming process from the third punch pin 31a to facilitate separation. (See Fig. 8)

Meanwhile, the third molding step may include a third molding step for molding the first guide hole 121a below the first hole 121. The first guide hole 121a of the third-first molding step allows the second hole 141 to be accurately formed while maintaining the concentricity in a subsequent step. (See Figs. 10, 11 and S141)

To this end, the second processed product 120 housed in the 3-1 mold 43 of the 3-1 dice section 42 in the 3 < rd > -1 die spindle 42a and the 3-1 punch pin 41a of the 3-1 punching portion 41. [

Here, the 3-1 auxiliary punch pin 41b may be provided around the outer peripheral surface of the 3-1 punch pin 41a. The third-first auxiliary punch pin 41b can push out the third-first-order processed product 135 subjected to the third-order forming from the third-first punch pin 41a to facilitate separation. (See Fig. 10)

Next, in the fourth molding step, a second hole 141 having a predetermined depth is formed below the first hole 121 to manufacture a fourth processed product 140. [ The second hole 141 can be formed into the inside of the expansion part 123 accurately while maintaining the concentricity through the first guide hole 121a. (See Figs. 12, 13 and S150)

More specifically, the fourth punching pin 51a of the fourth punching portion 51 and the fourth punching pin 51a of the fourth punching portion 51, which are received in the fourth die 53 of the fourth die portion 52, 52 by the fourth die spindle 52a of the first through-hole 52, as shown in Fig. The outer diameter reduction portion 122 can be formed so as to extend downward together with the forming of the secondary hole 141. [ (See Figs. 12 and 13)

Here, a fourth auxiliary punch pin 51b may be provided around the outer peripheral surface of the fourth punch pin 51a. The fourth auxiliary punch pin 51b can push the fourth finished workpiece 140, which has undergone the fourth forming process, from the fourth punch pin 51a to facilitate separation. (See Fig. 12)

The fourth molding step is a fourth molding step for molding the flange portion 146 extending upward from the upper edge portion by setting up the upper edge portion of the fourth processed product 140 . &Lt; / RTI > (See Figs. 14, 15 and S151)

More specifically, the fourth-order punch pin (61) of the fourth-first punch portion (61) is inserted into the fourth-order workpiece (140) accommodated in the 4-1 mold (63) 61a of the fourth die 1 and the fourth -1 spindle 62a of the fourth die unit 62 to form the flange portion 146. (See Figs. 14 and 15)

Here, the 4-1 auxiliary punch pin 61b may be provided around the outer peripheral surface of the 4-1 punch pin 61a. This fourth 4-1 auxiliary punch pin 61b can form the flange portion 146 by pressing the upper edge portion of the fourth processed product 140 to the upper portion of the 4-1 mold 63. [ In addition, the 4-1 auxiliary punch pin 61b pushes out the 4 < rd > primary workpiece 140 on which the 4 < rd > primary molding has been performed from the 4-1 punch pin 61a, . (See Figs. 14 and 15)
1 to FIG. 15, the above-

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: first forming machine 11: first punching part
12: first dice unit 20: second forming unit
21: second punching portion 22: second dicing portion
30: third forming unit 31: third punching unit
32: third dice unit 40: third-type forming unit
41: 3-1 punch part 42: 3-1 dice part
50: fourth forming machine 51: fourth punching part
52: fourth dice section 60: 4-1 forming machine
61: 4-1 punch section 62: 4-1 dice section
110: first processed product 120: second processed product
121: first hole 122: outer diameter reduction portion
123: Third hole 130: Third processed product
140: Fourth workpiece 141: Second hole
146: flange portion 11a: first punch pin
21a: second punch pin 31a: third punch pin
C1: upper body C2: lower body

Claims

A continuous manufacturing method of a Pam nut for a display device,
The raw material M is cut using a cutting mold C including a hollow lower body C2 and a hollow upper body C1 positioned above the lower body C2, After the lower body C2 and the upper body C1 are positioned coaxially with each other, the upper body C1 flows in the horizontal direction to cut the raw material M Preparing a round bar shaped object;
Transferring the object cut by the upper body (C1) to a post-process by the transfer means;
The object is transferred to the first mold of the first forming machine 10 and the first punch pin 11a of the first forming machine 10 punches the object and curves and forms the lower edge of the object A first molding step of manufacturing a first finished product (110) having a fractured section;
Transferring the first finished product (110) to a post-process by a transfer means;
The first machined part 110 is transferred to the second mold of the second forming machine 20 and the second punch pin 21a of the second forming machine 20 is moved to the first machined part 110 The first processed product 110 is punched to form a first hole having a predetermined depth to the upper side of the first finished product 110 and at the same time the outer diameter is reduced downward to form a second reduced product 120, The machined product 120 is formed so as to be stepped downward from the upper part of the outer diameter reduction part, and the upper part of the second finished product 120 and the outer diameter reduction part are formed to be tapered, A secondary molding step formed so as to be confined on the inner peripheral surface of the upper side of the workpiece 110;
Transferring the second workpieces (120) to a post-process by the transfer means;
The second machined product 120 is transferred to the third mold of the third forming machine 30 and the third punch pin of the third forming machine 30 punches the second machined product 120, Wherein the third finished product (130) is produced by extending the outer diameter reduction portion downwardly, wherein the expansion portion is formed between the first hole and the outer diameter reduction portion, And the first hole is formed on the extension portion so as not to reach the outer diameter reduction portion, and the first hole is formed on the extension portion only on the extension portion, A third forming step of forming a depth;
Transferring the third processed product (130) to a post-process by the transfer means;
The transferred third processed product 130 is transferred to the fourth mold of the fourth forming machine 50 and the fourth punch pin 51a of the fourth forming machine 50 is transferred to the third processed product 130 And the second hole is formed by extending a downward length of the outer diameter reducing portion, and the second hole is formed in the second hole, And a fourth molding step communicating from the primary hole, the fourth molding step being formed so as to reach the outer diameter reducing section from the expansion section,
In the third forming step, the extending portion is processed into a polygonal cross-section of the outer peripheral surface, and the third die spindle 32a of the third forming machine 30 and the outer diameter reducing portion A fixing pin having a shape corresponding to that of the outer diameter reducing portion is formed separately from the third die spindle 32a,
The fourth forming step may include a fourth forming step of forming a flange extending outward from the upper edge of the third finished product 130 by setting up the upper edge of the third finished product 130 Wherein the method comprises the steps of:

The method according to claim 1,
In the third molding step,
Wherein the extending portion has a hexagonal cross-section in the outer peripheral surface.

The method according to claim 1,
Wherein the third forming step comprises:
And a third primary molding step of forming a first guide hole below the first hole.

The method of claim 3,
In the fourth molding step,
And the second hole is formed inside the extension portion through the first guide hole.

5. The method of claim 4,
In the fourth molding step,
Wherein the outer diameter reducing portion extends downward together with the molding of the second hole.

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