KR101687531B1 - Yoke manufacturing method - Google Patents

Yoke manufacturing method Download PDF

Info

Publication number
KR101687531B1
KR101687531B1 KR1020150080307A KR20150080307A KR101687531B1 KR 101687531 B1 KR101687531 B1 KR 101687531B1 KR 1020150080307 A KR1020150080307 A KR 1020150080307A KR 20150080307 A KR20150080307 A KR 20150080307A KR 101687531 B1 KR101687531 B1 KR 101687531B1
Authority
KR
South Korea
Prior art keywords
knuckle
shaft portion
mold
pressing
hollow shaft
Prior art date
Application number
KR1020150080307A
Other languages
Korean (ko)
Other versions
KR20160144046A (en
Inventor
고진범
Original Assignee
고진범
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 고진범 filed Critical 고진범
Priority to KR1020150080307A priority Critical patent/KR101687531B1/en
Publication of KR20160144046A publication Critical patent/KR20160144046A/en
Application granted granted Critical
Publication of KR101687531B1 publication Critical patent/KR101687531B1/en

Links

Images

Classifications

    • 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
    • B21K1/14—Making machine elements fittings
    • 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
    • B21J5/022—Open die forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction

Abstract

A method of manufacturing a yoke is disclosed. According to an aspect of the present invention, there is provided a method of manufacturing a yoke according to an embodiment of the present invention, in which a yoke having a hollow shaft portion and a pair of knuckle portions extending to face each other at one end of the shaft portion, A first pressing step of forwardly extruding the material so as to form a pair of knuckles at one end of the material to form an intermediate mold; And a second pressing step of rearwardly extruding the intermediate mold so that the other end of the intermediate mold may form the shaft portion.

Description

{YOKE MANUFACTURING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a yoke manufacturing method for manufacturing a yoke by press-molding a pipe-shaped material.

A yoke is a part used for connecting between two axes with different angles, and is often employed to connect a drive shaft and a driven shaft to a steering apparatus of a vehicle.

The yoke has a shaft portion and a pair of knuckle portions extending to face each other from the body.

When two shafts are to be connected, any one of the shafts can be slidably engaged with the shafts, and the shafts can be splined so that the shafts can be moved forward and backward.

Another axis may be rotatably coupled between the pair of knuckle portions, and each knuckle portion may be provided with a coupling hole so that the shaft is rotatably coupled.

In this method of manufacturing a yoke, there is a method of press-molding a single pipe-shaped material cut to a predetermined length. In this case, a method of inserting a material into a molding space of a mold and pressing with a punch is mainly used.

Korean Patent Registration No. 10-0982725 discloses an example of a method of manufacturing a yoke by press-molding a yoke using a pipe-shaped material.

In the conventional yoke manufacturing method disclosed in the above publication, the shaft portion is first formed by pressing one end portion of the material so as to elongate. In this state, the cross-sectional area of the other end portion of the material is increased and then the other end portion of the material having increased cross- So that the knuckle portion is formed.

Korean Patent Publication No. 10-0982725

However, since the conventional yoke manufacturing method disclosed in the above publication adds a step of increasing the cross-sectional area of the end portion of the blank for forming the knuckle portion before forming the knuckle portion after forming the shaft portion, there is a limit to shorten the manufacturing process of the yoke there was.

Also, in the case of a pipe-shaped material having a small cross-sectional area, excessive stress can be concentrated in the course of increasing the cross-sectional area of the knuckle part, so that it is difficult to ensure sufficient knuckle stiffness.

Embodiments of the present invention provide a method of manufacturing a yoke that can effectively shorten a manufacturing process in manufacturing a yoke by press-forming a pipe-shaped material.

It is another object of the present invention to provide a yoke manufacturing method capable of sufficiently securing the rigidity of a knuckle portion in manufacturing a yoke by press-forming a pipe-shaped material, thereby further improving the reliability of the yoke.

According to an aspect of the present invention, there is provided a yoke having a hollow shaft portion and a pair of knuckle portions extending at opposite ends of the shaft portion, the pipe-shaped material being inserted into a molding space of a mold, A first pressing step of forwardly extruding the material so that one end of the material forms a pair of knuckles to form an intermediate molding; And a second pressurizing step of rearwardly extruding the intermediate mold so that the other end of the intermediate mold may form the shaft portion.

Wherein the other end of the intermediate mold is formed with a hollow shaft portion having an inner diameter and an outer diameter that are coincident with the material, the outer side of the knuckle portion coinciding with the outer diameter of the material, and the thickness between the inner side and the outer side, And the molding space is provided with a pair of knuckle-shaped portions provided on both sides of the mold for forming a pair of knuckle portions, and a pair of knuckle-shaped portions formed on both sides of the knuckle- Wherein the upper end of the material seated on the hollow shaft portion forming portion is pressed to the bottom portion by using a first punch whose cross-sectional shape coincides with the hollow shaft portion in the first pressing step, In the pressurizing step, the outer circumferential surface of the end of the hollow shaft portion of the intermediate molding is matched with the outer diameter of the hollow shaft portion and the inner diameter thereof coincides with the inner diameter of the shaft portion And can be pressed to the bottom portion by using the second punch.

The knuckle portion is provided with a convex curved surface in the extending direction of the knuckle portion, and the pair of knuckle forming portions in the first pressing process can communicate with the outside of the mold through the air hole.

Wherein a pair of eject pins are provided in the mold so as to be able to enter each of the knuckle forming portions along a direction opposite to a direction in which the punch is pressed, And a pair of second eject pins used in the second pressurizing process, and the air hole may be provided in the first eject pin so as to communicate the knuckle part forming part and the outside of the mold .

Wherein the mold has a pin guide hole vertically penetrating the bottom of the sleeve forming part to guide the advancing / retreating operation of the eject pin, wherein the eject pin has a diameter capable of blocking the pin guide hole, And the air hole is formed vertically along the longitudinal direction of the first eject pin on the inner side of the first eject pin so as to correspond to the center of the inner side surface of the knuckle portion so as to correspond to the curvature of the curvature surface And in the first pressing step, the first eject pin can maintain the inserted state in the pin guide hole so that the upper surface thereof covers the space between the knuckle forming portion and the pin guide hole.

The pressing surface of the end of the second punch for pressing the hollow shaft portion toward the bottom may be inclined downward from the inner periphery toward the outer periphery.

The inclination of the pressing surface may be set to 30 degrees.

The yoke may be made of aluminum.

In the method of manufacturing a yoke according to an embodiment of the present invention, in manufacturing a pipe-shaped material by a yoke, the shaft portion is press-formed through rear extrusion in a state where one end of the material is first press- .

Therefore, according to the present invention, the process of increasing the cross-sectional area of the material for knuckle formation is eliminated, thereby shortening the manufacturing process of the yoke.

In addition, in the yoke manufacturing step of extruding the shaft portion backwards in the state where the knuckle portion is first extruded forward, there is less concern that excessive stress concentrates on the pipe-shaped material having a small cross-sectional area, and therefore rigidity of the knuckle portion can be sufficiently secured.

FIG. 1 is a perspective view showing a structure of a pipe-shaped material used in a method of manufacturing a yoke according to an embodiment of the present invention, an intermediate molded body formed through a material, and a yoke. FIG.
Figure 2 shows the structure of Figure 1 in cross-sectional form.
3 is a cross-sectional view illustrating a structure of a first mold and a first punch used in a method of manufacturing a yoke according to an embodiment of the present invention.
4 is a perspective view illustrating a structure of a first eject pin used in a yoke manufacturing work according to an embodiment of the present invention.
5 is a view showing a state in which a workpiece is molded into an intermediate mold through a first pressing process using a first mold and a first punch in the method of manufacturing a yoke according to an embodiment of the present invention.
6 is a view illustrating a state in which an intermediate mold is formed into a yoke through a second pressurizing process by a second mold and a second punch in the method of manufacturing a yoke according to an embodiment of the present invention.
FIG. 7 shows a state in which the first pressurizing process is completed after FIG. 6. FIG.
8 shows the flow of the intermediate moldings around the pressing surface when the pressing surface of the second punch is at 0 degree.
FIG. 9 is a comparative diagram in which a tensile fracture is analyzed and compared when the inclination of the pressing surface of the second punch is 30 degrees and 0 degrees in the second pressing process of the yoke manufacturing method according to an embodiment of the present invention.
10 is a comparative chart comparing and analyzing temperatures due to friction during flow when the inclination of the pressing surface of the second punch is 30 degrees and 0 degrees in the second pressurizing process of the yoke manufacturing method according to the embodiment of the present invention to be.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 and 2, a yoke manufacturing method according to an embodiment of the present invention is a yoke manufacturing method for manufacturing a yoke 3 by press-molding a pipe-shaped workpiece 1 cut to a predetermined length .

The material (1) is made of aluminum and can be prepared by cutting a pipe having a certain length in the longitudinal direction of the inner diameter and outer diameter size machine so as to have an appropriate length.

The yoke 3 which is press-molded through the material 1 may be provided with a shaft portion 4 and a pair of knuckle portions 5 extending from the shaft portion 4 so as to face each other. In order to reduce the interference with the surroundings during the rotation operation, the end of the knuckle part 5 in the extending direction side may be provided to form a convex curved surface 5a formed along the rotational direction of the knuckle part 5.

In the yoke 3, a spline can be machined so that one shaft can be coupled to the shaft portion 4 so as to be movable forward and backward. In the knuckle portion 5, another shaft is disposed between the pair of knuckle portions 5 The engaging hole can be machined to be rotatably engaged. Splines or engagement holes can be formed through post-processing. In this embodiment, the yoke 3 indicates a state before the post-processing.

In the yoke manufacturing method according to the present embodiment, the work 1 is inserted into the molding space 20 of the molds 10 and 10A and the upper portion of the work 1 placed in the molding space 20 is pressed by the punches 100 and 200 So as to form the yoke 3 through the forging process.

Such a yoke forming process includes a first pressurizing process for forwardly extruding a material so that one end of the material forms a pair of knuckle portions 5 to form an intermediate mold 2, And a second pressing step of rearwardly extruding the intermediate molding 2 so as to form the intermediate molding 2.

As shown in Figs. 1 and 2, the other end of the intermediate molding 2 forms a hollow shaft portion 2a whose inner diameter and outer diameter coincide with the work 1. That is, the material (1) and the hollow shaft portion (2a) have the same thickness (t1, t2) between the inner surface and the outer surface.

The outer surface of the knuckle part 5 coincides with the outer diameter of the work 1 and the thickness t3 between the inner and outer surfaces is smaller than the thickness t1 between the inner diameter and the outer diameter of the work 1 .

3 to 7, the molding space 20 includes a pair of knuckle forging portions 30 provided on both sides of the bottom of the mold 10 for molding a pair of knuckle portions 5, And a hollow shaft portion forming portion 40 provided so as to communicate with the knuckle forming portion 30 above the knuckle invisible portion 30 for forming the shaft portion 2a.

The knuckle forging portion 30 is provided through a space that coincides with the size of the knuckle portion 5 and the hollow shaft portion forming portion 40 is formed to have a length greater than the length of the hollow shaft portion 2a It can be deeper.

3 to 5, in the first pressurizing process, the upper end of the work 1, which is seated on the hollow shaft forming portion 40 of the molding space 20 of the first mold 10, So as to form the intermediate molded product 2. [0035]

The first punch 100 may have a hollow section formed in a hollow shape from the upper portion of the first mold 10, And presses the upper end of the work 1 to the bottom via the bottom side pressing portion 110 shaped like the shaft portion 2a and the work 1. Therefore, the one end portion of the bottom portion of the blank 1 is pressed toward the knuckle forming portions 30 on both sides of the bottom portion by the forward extrusion method to form a pair of knuckle portions 5.

The intermediate mold 2 is pressed by the first eject pin 50 provided on the first mold 1 in a state where the blank 1 is molded into the intermediate mold 2 having the pair of knuckle portions 5, And then transferred to the second mold 10A, and then the second pressurizing process is carried out.

In the second pressurizing process, the second mold 10A may be provided with the same molding space 20 as the first mold 10. In the second pressurizing process, the second punch 200 may be provided with the intermediate mold 2 Is pressed. The second punch 200 has an outer diameter equal to the outer diameter of the hollow shaft portion 2a and an inner diameter equal to the inner diameter of the shaft portion 4 through the lower pressing portion 210, The outer peripheral surface of the end portion is pressed to the bottom portion.

Accordingly, the hollow shaft portion 2a is pressurized toward the inner diameter side by the backward extrusion method to be expanded to the upper portion while being axially guided, and the shaft portion 4 is formed.

According to the first and second pressing processes, the process of increasing the cross-sectional area of the blank 1 for forming the knuckle part 5 in manufacturing the yoke 3 with the pipe-shaped blank 1 is eliminated The manufacturing process of the yoke 3 can be shortened. In addition, in the yoke manufacturing step of extruding the shaft portion 4 in a state in which the knuckle portion 5 is first extruded forwardly, there is less fear that excessive stress is concentrated on the pipe-shaped workpiece 1 having a small cross- 5) side stiffness can be sufficiently secured.

In addition, in the first pressurizing step, the pair of knuckle forming portions 30 can communicate with the outside of the first mold 10 through the air holes 51.

The molds 10 and 10A are provided with a pair of eject pins 50 and 60 so as to be able to enter the respective knuckle forming portions 30 along the direction opposite to the pressing direction of the punches 100 and 200, The lower molds 10 and 10A of the knuckle forming unit 30 can be vertically penetrated through the pin guide holes 10a to guide the forward and backward movement of the knuckle forming unit 30. [ The eject pins 50 and 60 may be divided into a first eject pin 50 used in the first pressing process and a second eject pin 60 used in the second pressing process, The first and second eject pins 50 and 60 seal the pin guide hole 10a and the air hole 51 is formed in the first eject pin 50 so that the knuckle So that the molding portion 30 and the outside of the first mold 10 are communicated with each other.

The air that is compressed between the blank 1 and the knuckle-shaped portion 30 of the molding space 20 in the first pressing step in which the blank 1 is pressed by the first punch 100 is guided to the air hole 10a, So that it can be discharged to the outside of the mold 10.

Therefore, in the first pressurizing step, a high pressure is not formed between the work 1 and the knuckle forming portion 30 by the pressing operation of the first punch 100, so that the work 1 in the knuckle- It is possible to effectively flow the bottom portion of the material 1 to the corner of the knuckle-shaped portion 30 through a single pressurization process, and thus, even without the trimming process, the end portion of the knuckle portion 5 The curved surface 5a can be precisely molded in a high strength state. Further, in a state in which the fluidity of the material 1 is ensured smoothly, no excessive pressure is applied to the first mold 10 during the press forming process of the material 1, There is no fear that the life of the one mold 10 is shortened.

Each knuckle-shaped portion 30 may include an inner inner side portion 31 facing the other knuckle shaped portion 30 on the opposite side and an outer side portion 32 outside the inner side portion 31 The ejection pins 50 and 60 have a diameter capable of blocking the pin guide hole 10a and have a concave surface 52 concave on the upper surface so as to correspond to the curvature surface 5a of the knuckle part 5 So that the concave upper surface in the first and second pressing processes can be installed so as to be inserted into the pin hole 10a so as to block the gap between the knuckle forming portion 30 and the pin guide hole 10a.

Due to the structure of the knuckle forming portion 30, the material 1 flows toward both sides of the bottom portion so as to fill both knuckle forging portions 30 first as the upper portion is pressed by the first punch 100.

The material 1 flowing from the hollow shaft portion forming portion 40 to both the knuckle undercut portions 30 on the bottom portion in the structure in which the pair of knuckle auxiliary forming portions 30 are formed on both sides of the molding space 20 The knuckle invisible portion 30 starts to be filled in the state of being pressed by the outer side surface portion 32 from the side surface portion 31 and the edge of the knuckle invisible portion 30 between the concave surface 52 and the inner side surface portion 31 is finally The air hole 51 is formed in the knuckle support portion 30 to smoothly discharge the high pressure air formed in the knuckle invisible portion 30 to the outside of the first mold 10 during the molding of the intermediate molding 2. [ It is advantageous to arrange it at a position where it is not likely to be clogged by the material 1 without being disturbed to the flow of the material 1 flowing through the material 1 as much as possible.

Particularly, the aluminum material has a flow velocity twice as fast as that of ordinary steel. Therefore, in the process of molding the aluminum intermediate material 2, the flow of the material 1 proceeds to the air hole 51, 51) is more likely to be clogged. When the air hole 51 is clogged with the work 1, the space between the work 1 and the knuckle auxiliary mold 30 is closed again, and the air hole 51 must be punched again during the molding of the intermediate molding 2 It can be troublesome.

Therefore, considering the shape of the molding space 20 and the flow characteristics of the work 1 described above in accordance with the pressing action of the work 1 by the first punch 100, the air hole 51 has the final flow area It is preferable that the gap between the concave surface 52 and the inner side surface portion 31 is perpendicular to the outside of the first mold 10. The air hole 51 is provided in the form of a groove formed along the longitudinal direction of the first eject pin 50 on the inner side of the first eject pin 50 so as to correspond to the center of the inner side surface portion 31.

Therefore, in the positional structure of the air hole 51, the air pressure inside the knuckle supporting portion 30 is maintained until the molding of the knuckle portion 5 is completed by the material 1 filling the knuckle forming portion 30 And can be smoothly discharged to the outside of the mold 10 through the air hole 51.

6 to 7, the pressing portion 210 of the second punch 200, which presses the upper end of the hollow shaft portion 2a in the second pressing process, It is preferable that the pressing surface 211 is inclined downward along the flow direction of the hollow shaft portion 2a which is gathered toward the inner diameter side from the outer diameter side to form the shaft portion 4 so as to form the shaft portion 4, 4 in order to reduce the stress applied to the yoke 3 during the molding process and further prolong the service life of the second mold 10A.

The second eject pin 60 used in the second pressurizing process is provided in a completely filled state to prevent the knuckle part 5 from being deformed to maintain a state in which the pin guide hole 10a is closed, The eject pin 6 enters the inside of the knuckle forming portion 30 in a state where the second pressing process is completed and ejects the molded yoke from the second mold 10A.

In the second pressurizing step of forming the hollow shaft portion 2a into the shaft portion 4 through the inclined pressing surface 211, the flow of the hollow shaft portion 2a for forming the shaft portion 4 is continuously performed So that the possibility of crack formation of the yoke 3 produced by reducing the probability of tensile breakage can be reduced, so that the product reliability of the yoke 3 is further improved .

It is preferable that the inclination of the pressing surface 211 is set to 30 degrees in consideration of the material characteristic of aluminum which is twice as high as the flow velocity of the ordinary steel.

8 shows the flow direction of the hollow shaft portion 2a for forming the shaft portion 4 when the pressing surface 211 'is at 0 degree. 6, as compared with the case where the inclination of the pressing surface 211 is 30 degrees, the flow of the hollow shaft portion 2a in the case of FIG. An excessive flow friction is formed in the material around the pressing surface 211 'as the flow of the material flowing from the bottom side to the upper side of the pressing surface 211' is vertically bent, There is a high possibility that the flow velocity of the material and the flow velocity of the material directly pressurized by the pressurizing surface 211 'cause a break or crack in the molded yoke 3.

However, if the pressing surface 211 is inclined as in the present embodiment, the fluid body of the hollow shaft portion 2a for forming the shaft portion 4 is not vertically moved but is obliquely guided toward the upper side of the pressing surface 211 The flow of the material smoothes, friction and stress concentration are prevented, and the possibility of cracking or cracking of the molded yoke is remarkably reduced, so that the life of the molded yoke can be increased.

9 is a comparative diagram of a simulation analysis of temperature due to tensile failure and friction during flow when the inclination of the pressing surface 211 of the second punch 200 is 30 degrees and zero degrees.

As shown in FIG. 9, it can be confirmed that the tensile failure probability of about three times as high as that of the case where the inclination of the pressing surface 211 is flat by 30 degrees is measured to be high.

As shown in FIG. 10, it can be seen that the temperature due to the friction is higher by about 100 ° C than when the inclination of the pressing surface 211 is 30 ° in the case of 0 ° inclination. That is, when the pressing surface 211 is inclined at 30 degrees, the coefficient of friction is much lower, which is advantageous for reducing the stress applied to the yoke 3 and prolonging the life of the mold 10A.

1: material 2: intermediate moldings
2a: hollow shaft portion 3: yoke
4: shaft portion 5: knuckle portion
5a: curvature surface 10: first mold
10A: second mold 10a: pin guide hole
20: forming space 30: knuckle negative fitting
40: hollow shaft forming part 50: first eject pin
51: Air hole 60: Second eject pin
100: first punch 200: second punch
211: pressing face

Claims (8)

A yoke manufacturing method for inserting a pipe-shaped material into a molding space of a mold and press-molding the same with a punch to manufacture a yoke having a hollow shaft portion and a pair of knuckle portions extending to face each other at one end of the shaft portion,
A first pressing step of forming the intermediate molding by forward-extruding the material so that one end of the material forms a pair of knuckles; And
And a second pressing step of rearwardly extruding the intermediate mold so that the other end of the intermediate mold may form the shaft portion,
And the other end of the intermediate molding is formed with a hollow shaft portion having an inner diameter and an outer diameter which are coincident with the material,
Wherein the outer surface of the knuckle portion is coincident with the outer diameter of the workpiece and the thickness between the inner surface and the outer surface is smaller than the thickness between the inner diameter and the outer diameter of the workpiece,
Wherein the molding space includes a pair of knuckle-shaped mold portions provided on both sides of the bottom of the mold for forming a pair of knuckle portions, and a hollow shaft portion molding portion provided on the knuckle-shaped mold portion for molding the hollow shaft portion,
In the first pressing step, the upper end of the material seated on the hollow shaft portion forming portion is pressed to the bottom portion by using a first punch whose sectional shape coincides with the hollow shaft portion,
Wherein the outer circumferential surface of the end of the hollow shaft portion of the intermediate molding is pressed to the bottom by using a second punch whose outer diameter coincides with the outer diameter of the hollow shaft portion and whose inner diameter coincides with the inner diameter of the shaft in the second pressurizing step.

delete The method according to claim 1,
Wherein an end of the knuckle portion in the extending direction is provided with a convex curvature surface in the extending direction of the knuckle portion,
Wherein the pair of knuckle forming portions communicate with the outside of the mold through the air holes in the first pressing step. The method of claim 3,
A pair of eject pins are provided in the mold so as to be able to enter the respective knuckle forming portions along the direction opposite to the pressing direction of the punch,
Wherein the eject pin includes a pair of first eject pins used in the first pressing process and a pair of second eject pins used in the second pressing process,
And the air hole is provided in the first eject pin so as to communicate the knuckle part forming part and the outside of the mold. 5. The method of claim 4,
Wherein the mold is provided with a pin guide hole penetrating vertically through the bottom of the knuckle part forming part so as to guide the advancing / retreating operation of the eject pin,
Wherein the eject pin has a concave surface with an upper surface concave to correspond to a curvature of the curvature surface,
Wherein the air hole is formed on the inner side of the first eject pin so as to correspond to the center of the inner side surface of the knuckle portion and perpendicular to the longitudinal direction of the first eject pin,
Wherein in the first pressing step, the first eject pin is kept inserted into the pin guide hole so that the upper surface thereof covers the gap between the knuckle forming portion and the pin guide hole. The method according to claim 1,
And the pressing surface of the end of the second punch for pressing the hollow shaft portion toward the bottom is inclined downward from the inner periphery toward the outer periphery. The method according to claim 6,
Wherein the inclination of the pressing surface is 30 degrees. The method according to claim 1,
Wherein the yoke is made of an aluminum material.

KR1020150080307A 2015-06-08 2015-06-08 Yoke manufacturing method KR101687531B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150080307A KR101687531B1 (en) 2015-06-08 2015-06-08 Yoke manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150080307A KR101687531B1 (en) 2015-06-08 2015-06-08 Yoke manufacturing method

Publications (2)

Publication Number Publication Date
KR20160144046A KR20160144046A (en) 2016-12-16
KR101687531B1 true KR101687531B1 (en) 2016-12-19

Family

ID=57735417

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150080307A KR101687531B1 (en) 2015-06-08 2015-06-08 Yoke manufacturing method

Country Status (1)

Country Link
KR (1) KR101687531B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019107713B4 (en) * 2019-03-26 2022-08-18 Hirschvogel Umformtechnik Gmbh Chassis component and method for manufacturing a chassis component

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101247798B1 (en) * 2011-03-30 2013-03-26 (주)대림엠티아이 Apparatus for manufacturing yoke used steering shaft system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000058458A (en) * 2000-05-29 2000-10-05 김민응 Steering yoke manufacturing process for automobile's steering system
KR100982725B1 (en) 2007-01-26 2010-09-17 고진범 Yoke manufacturing method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101247798B1 (en) * 2011-03-30 2013-03-26 (주)대림엠티아이 Apparatus for manufacturing yoke used steering shaft system

Also Published As

Publication number Publication date
KR20160144046A (en) 2016-12-16

Similar Documents

Publication Publication Date Title
KR20060116099A (en) Universal joint for vehicle and manufacturing method thereof
CN102862020B (en) Input shaft of steering device for car and manufacturing method thereof
KR101632702B1 (en) Manufacturing method of pipe joint for automobile steering apparatus
JP2006266286A (en) Manufacturing method for outer ring member for constant velocity joint and its intermediate molded body
JP4869968B2 (en) Closed forging die and forging method
JP3787767B2 (en) Method for manufacturing hooked connecting shaft
KR101687531B1 (en) Yoke manufacturing method
CN109715313A (en) Utilize the method for pipe manufacture universal joint
CN108555200B (en) Cold heading process and cold heading die for oil pipe joint
JPS61201926A (en) Yoke member and its manufacture of iuniversal joint
KR20080098963A (en) Yoke manufacturing method
KR101580146B1 (en) Yoke forming method of shaft joint for automobile steering system
JP4713675B1 (en) Method for manufacturing hose fittings
JP3861072B2 (en) Manufacturing method of semi-finished product for piston
CN213224144U (en) Flash-free gear forging die
KR101046189B1 (en) Solid Shaft Manufacturing Method for Solid Shaft Universal Joint
CA1150670A (en) Closed chamber extrusion method and apparatus for shaping of metal rod into tulip-shaped part
JP5798965B2 (en) Hollow piston for disk brake and molding die
KR100502780B1 (en) Method and apparatus for manufacturing inner tube
KR20120036161A (en) Clamp joint and method for manufacturing clamp joint by closed-die forging
JP5583490B2 (en) Forging punch
KR101720035B1 (en) Dies for cold forging
KR101642043B1 (en) pipe end coupling and Manufacture method
CN111069414B (en) Part punching device and method
CN104289652A (en) Extrusion forming cold-upsetting die and application method thereof

Legal Events

Date Code Title Description
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20191202

Year of fee payment: 4