KR101704932B1 - Manufacturing method of cotter pin shaft - Google Patents

Manufacturing method of cotter pin shaft Download PDF

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Publication number
KR101704932B1
KR101704932B1 KR1020150157131A KR20150157131A KR101704932B1 KR 101704932 B1 KR101704932 B1 KR 101704932B1 KR 1020150157131 A KR1020150157131 A KR 1020150157131A KR 20150157131 A KR20150157131 A KR 20150157131A KR 101704932 B1 KR101704932 B1 KR 101704932B1
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South Korea
Prior art keywords
processed product
forming
pair
side grooves
cold forging
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KR1020150157131A
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Korean (ko)
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장희복
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장희복
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/10—Piercing billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The present invention relates to a method of manufacturing a cotter pin shaft. The method comprises: a cutting step of cutting a round bar at a predetermined length to obtain a material; a step of forming a lower groove with a predetermined depth to be recessed at a center of the lower end portion of the cut material through cold forging, to form a primary processed product; a step of forming a pair of side grooves with a predetermined length to be recessed to communicate and be symmetrical with the lower groove on an outer surface of the lower end portion of the primary processed product through cold forging, to form a secondary processed product; a step of forming a head protruding in a radial direction of the material on the upper end portion of the secondary processed product through cold forging in a state where a support mold is inserted to each of the pair of side grooves of the secondary processed product, to form a tertiary processed product; and a step of drilling the tertiary processed product to form a through-hole, to communicate with the pairs of side grooves at a position separated from the lower groove.

Description

TECHNICAL FIELD [0001] The present invention relates to a manufacturing method of a cotter pin shaft,

The present invention relates to a method of manufacturing a cotter pin shaft, and more particularly, to a method of manufacturing a cotter pin shaft by cold forging.

When assembling a cotter pin for assembling an electric insulator in a high-voltage transmission tower, it is very difficult to assemble the cotter pin because the safety gloves must be removed.

Particularly, since such a cotter pin assembly operation is performed in the energized state, the cotter pin assembly operation is not only very difficult but also poses a risk. In some cases, an electric shock accident often occurs during the operation of assembling the cotter pin.

In order to solve such a problem, in recent years, a wire-shaped fixing pin is rotatably assembled on the ground in advance on the cotter pin shaft so that the wire-shaped fixing pin is rotated even in the high position of the transmission tower, .

1, the crotch pin shaft 10 to which the wire-shaped fixing pin 20 having such a non-circular loop shape is fastened is provided with a center rod 11, one end of the center rod 11, And a head 13 protruding in the outer radial direction of the center rod 11 in the radial direction.

A pair of side grooves 15 for aligning the wire-shaped fixing pins 20 having a non-circular loop shape are formed symmetrically on the free end of the center rod 11.

A bottom groove 17 communicating with the pair of side grooves 15 is formed on the bottom surface of the free end of the center rod 11.

A through hole 19 is formed in the center rod 11 at a position spaced apart from the lower groove 17 and through which the fixing pin 20 in the form of a wire having a non-circular loop shape is inserted.

The process of fixing the coater pin 1 to the electric insulator assembly pipe 100 with this structure will be briefly described with reference to FIG.

4 (a), in a state where the fixing pin 20 is assembled to the cotter pin 1 so that the wire-shaped fixing pin 20 is aligned by the side groove 15 of the cotter pin shaft 10, Is inserted into the electric insulator assembly pipe 100 as shown in Fig.

Next, as shown in FIG. 4 (b), the coater pin 1 is inserted into the electric insulator assembly pipe 100 so that the fixing pin 20 protrudes from the electric insulator assembly pipe 100.

4 (c), by rotating the fixing pin 20 so that the fixing pin 20 is disposed laterally with respect to the cotter pin 11, (Not shown).

Therefore, the wire-shaped fixing pin 20 is rotatably assembled to the cotter pin shaft 10 on the ground so that the wire-shaped fixing pin 20 is rotated even in the high position of the transmission tower, So that it can be easily fixed to the electric insulator assembly pipe 100 or the like.

However, such a conventional cotter pin shaft is manufactured by cutting a round bar into a predetermined size and then performing a cutting process such as roughing, turning, and grinding, a first milling process for forming a pair of side grooves, a second milling process for forming a bottom groove Milling, and drilling to form pin through holes.

Therefore, since the conventional cotter pin shaft is manufactured through a series of machining processes, a considerable amount of material loss occurs when the cotter pin shaft is machined, which is an uneconomical problem.

In addition, the processing cost is increased by the processing amount of the material, so that the manufacturing cost is increased and the processing time is increased, resulting in a decrease in productivity.

In addition, since the entire process of manufacturing the product is performed by machining, burrs are generated in the product, resulting in a problem of poor surface roughness.

Korean Patent Registration No. 10-0781504 (Title of the Invention: Manufacturing Method of Roll Coater, Notification Date: December 5, 2007)

The present invention provides a method of manufacturing a cotter pin shaft that can reduce manufacturing cost by reducing loss of material and can reduce manufacturing cost, improve productivity, and reduce defects in surface roughness .

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting method and a cutting method, Forming a lower-end groove having a predetermined depth in a center of a lower end of the cut material through cold forging to form a primary workpiece; Forming a pair of side grooves having a certain length symmetric with the lower groove on the outer surface of the lower end of the primary work through cold forging to form a secondary work piece; Forming a head protruding in a radial direction of the work from an upper end portion of the secondary work through a cold forging in a state in which a support metal mold is inserted into a pair of side grooves of the secondary work, Wow; And forming a through hole by drilling the third work piece so as to communicate with the pair of side grooves at a position spaced apart from the lower groove to form a through hole. have.

Here, in the step of molding the third processed product, the supporting mold may have a sectional shape corresponding to a pair of side grooves of the secondary processed product.

In the step of forming the through-hole, the through-hole may be formed in parallel with the bottom groove.

According to the present invention, by manufacturing the cotter pin shaft through cold forging without manufacturing it by a conventional method, it is possible to reduce the manufacturing cost of the material, thereby reducing the manufacturing cost, improving the productivity, It is possible to reduce the badness of illumination.

1 is a perspective view of a cotter pin,
FIG. 2 is a view showing a stepwise manufacturing process of a cotter pin shaft according to the present invention,
FIG. 3 is a sectional view showing a forming state of the cotter pin shaft according to the present invention,
Fig. 4 is a view showing the step of assembling the cotter pin step by step.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, the cotter pin 1 includes a cotter pin shaft 10 having a rod shape having a predetermined length formed with a step on the outer circumference, a non-circular-loop shape (not shown) rotatably coupled to the cotter pin shaft 10, Shaped fixing pin 20 having a wire-like shape.

The crotch pin shaft 10 includes a bar-shaped center rod 11 having a predetermined length and a head 13 protruding in an outer radial direction of the center rod 11 at one end of the center rod 11.

At the free end of the center rod 11, a pair of side grooves 15 for aligning a wire-shaped fixing pin 20 having a non-circular loop shape are formed. The pair of side grooves 15 are formed symmetrically with a predetermined length and depth along the longitudinal direction of the center rod 11.

A bottom groove 17 communicating with the pair of side grooves 15 is formed on the bottom surface of the free end of the center rod 11.

The center rod 11 is formed with a through hole 19 communicating with a pair of side grooves 15 at a position spaced apart from the bottom groove 17 and passing through the center groove 11 in parallel with the bottom groove 17. A through-hole 19 is formed with a wire-shaped fixing pin 20 having a non-circular loop shape.

Hereinafter, a manufacturing process of the cotter pin shaft 10 according to the present invention will be described with reference to FIGS. 2 and 3. FIG.

The manufacturing method of the cotter pin shaft 10 according to the present invention includes a material cutting step, a primary workpiece shaping step, a secondary workpiece shaping step, a third workpiece shaping step, and a through hole forming step.

Hereinafter, each step will be described in detail.

In the material cutting step, as shown in Figs. 2A and 3A, the round bar is cut to a predetermined length to obtain the blank 30. [0050] As shown in Fig.

In the primary processed product forming step, the material 30 is supplied into the cold forging dies 140a and 140b and then the material 30 is pressed using the punch pins 145a and 145b to form 3 (b), the bottom groove 17 having a certain depth is formed in the center of the bottom of the lower end portion of the cut material 30 to obtain the primary workpiece 40. As shown in Fig. Here, the punching surface of the upper punch pin 145a has a flat surface, and the punching surface of the lower punch pin 145b has a protrusion 147 protruding in a semicircular sectional shape.

Due to the formation of the bottom groove 17, the length of the primary processed product 40 is reduced relative to the cut material 30, while the thickness of the primary processed product 40 is increased.

The flowability of the metal material 30 between the inner circumference and the outer circumference of the lower groove 17 formed in the material 30 is increased during the cold forging of the material 30, (The flow of the metal structure), and the lower groove 17 is formed according to the shape of the cold forging dies 140a and 140b.

In the present embodiment, the bottom groove 17 has a semicircular cross-sectional shape, but the present invention is not limited thereto. The bottom groove 17 may have a cross-sectional shape of 'V' in which the sectional area gradually decreases from the lower end to the upper end of the cut material 30 Quot; cross-sectional shape.

The primary processed product 40 is supplied into the cold forging dies 150a and 150b and then the primary processed product 40 is pressed by using the punch pins 155a and 155b, a pair of side grooves 15 communicating with the bottom groove 17 and having a predetermined length are inserted into the outer surface of the lower end of the primary processed product 40 as shown in Figs. 3C and 3C, So as to obtain a secondary processed product 50. Here, the punching surface of the upper punch pin 155a has a flat surface, and the lower punch pin 155b has a pair of protrusions 157 protruding mutually opposite. The surface of each protrusion 157 of the lower punch pin 155b has a semicircular cross-sectional shape.

Due to the formation of the pair of side grooves 15, the length of the secondary workpiece 50 is reduced compared to the primary workpiece 40, while the thickness of the secondary workpiece 50 is increased.

In the third processed product molding step, the secondary finished product 50 is supplied into the cold forging dies 160a and 160b and then the secondary finished product 50 is pressed using the punch pin 165 to obtain A head 13 protruding in the radial direction of the workpiece is formed at the upper end of the secondary processed product 50 to form a tertiary finished product 60 having the head 13 as shown in Fig. . Here, the punching surface of the punch pin 165 has a cross-sectional shape corresponding to the cross-sectional shape of the head 13.

On the other hand, the pair of side grooves 15 of the secondary processed product 50 are formed so as not to deform the pair of side grooves 15 formed at the time of forming the secondary processed product 50 when the molded product 60 is molded. And a pair of support dies 160c having a cross-sectional shape corresponding to the cross-sectional shape of the support die 160 are inserted.

The length of the tertiary finished product 60 is reduced relative to the secondary finished product 50 due to the formation of the head 13, while the thickness is increased.

Here, the head 13 has an arc-shaped cross section.

When the third processed product 60 is produced through the cold forging process, the third processed product 60 is moved to the drilling machine and a pair of side grooves 15 and a pair of side grooves 15 are formed at a position spaced apart from the bottom groove 17 The through holes 19 are formed by drilling the third processed product 60 so as to communicate with each other. Here, the through holes 19 are formed so as to pass through in parallel with the lower groove 17.

The third processed product 60 is drilled to form the through hole 19. This makes it possible to obtain the cotter pin shaft 10 manufactured according to the manufacturing method of the present invention.

That is, the center rod 11 and the head 13 are integrally formed, and the lower groove 17, the pair of side grooves 15, and the through hole 19 are formed to obtain the cotter pin shaft 10 .

Thus, the method of manufacturing the cotter pin shaft 10 of the present invention is manufactured by cold forging rather than machining. It is possible to obtain the cotter pin shaft 10 having excellent surface roughness.

As described above, according to the present invention, by manufacturing the cotter pin shaft through cold forging without manufacturing it by conventional machining, it is possible to manufacture the cutter with reduced loss of material, thereby reducing manufacturing cost and improving productivity And it is possible to reduce defects in surface roughness.

Further, since the coater pin shaft manufactured according to the present invention is manufactured through cold forging, it is possible to maintain the uninterrupted flow of the sheathed line (the flow of the metal structure) unlike the coater pin shaft manufactured by machining, Increase.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

1: cotter pin 10: cotter pin shaft
11: center rod 13: head
15: side groove 17: bottom groove
19: Through hole 20: Fixing pin
30: Material 40: Primary processed product
50: Secondary product 60: Third product

Claims (3)

A material cutting step of cutting the round bar into a predetermined length to obtain a material;
Forming a lower-end groove having a predetermined depth in a center of a lower end of the cut material through cold forging to form a primary workpiece;
Forming a pair of side grooves having a certain length symmetric with the lower groove on the outer surface of the lower end of the primary work through cold forging to form a secondary workpiece;
Forming a head protruding in a radial direction of the work from an upper end portion of the secondary work through a cold forging in a state in which a support metal mold is inserted into a pair of side grooves of the secondary work, Wow;
And forming a through hole by drilling the third processed product so as to communicate with the pair of side grooves at a position spaced apart from the bottom groove. The method according to claim 1,
Wherein in the step of forming the third processed product, the supporting mold has a sectional shape corresponding to a pair of side grooves of the secondary processed product. The method according to claim 1,
Wherein in the step of forming the through holes, the through holes are formed in parallel with the lower groove.
KR1020150157131A 2015-11-10 2015-11-10 Manufacturing method of cotter pin shaft KR101704932B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101791385B1 (en) * 2017-04-18 2017-10-27 지종혁 Integral Type Cotter Pin Manufacturing Method
KR101791387B1 (en) * 2017-04-26 2017-11-20 지종혁 Integral Type Cotter Pin Manufacturing Method
KR101809546B1 (en) 2017-08-11 2017-12-15 박종수 Manufacturing method of cotter pin bolt using integrated mold
KR20190036041A (en) 2017-09-27 2019-04-04 대진볼트공업(주) Method for manufacturing cotter pin shaft
KR20210153279A (en) 2020-06-10 2021-12-17 주식회사 에이치엠 Manufacturing method for cotter pins combined with anti-separation pins

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100781504B1 (en) 2006-12-20 2007-12-05 배한성 The manufacturing method of roll coater
CN102011778A (en) * 2009-09-04 2011-04-13 上海第一机床厂有限公司 Manufacture process of cotter pin
KR20140141946A (en) * 2013-06-03 2014-12-11 박회동 Cotter Pin of Dead End Clamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100781504B1 (en) 2006-12-20 2007-12-05 배한성 The manufacturing method of roll coater
CN102011778A (en) * 2009-09-04 2011-04-13 上海第一机床厂有限公司 Manufacture process of cotter pin
KR20140141946A (en) * 2013-06-03 2014-12-11 박회동 Cotter Pin of Dead End Clamp

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101791385B1 (en) * 2017-04-18 2017-10-27 지종혁 Integral Type Cotter Pin Manufacturing Method
KR101791387B1 (en) * 2017-04-26 2017-11-20 지종혁 Integral Type Cotter Pin Manufacturing Method
KR101809546B1 (en) 2017-08-11 2017-12-15 박종수 Manufacturing method of cotter pin bolt using integrated mold
KR20190036041A (en) 2017-09-27 2019-04-04 대진볼트공업(주) Method for manufacturing cotter pin shaft
KR102017665B1 (en) * 2017-09-27 2019-10-21 대진볼트공업(주) Method for manufacturing cotter pin shaft
KR20210153279A (en) 2020-06-10 2021-12-17 주식회사 에이치엠 Manufacturing method for cotter pins combined with anti-separation pins

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