KR101872249B1 - Manufacturing method of pipe joint of universal joint for vehicle - Google Patents

Manufacturing method of pipe joint of universal joint for vehicle Download PDF

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Publication number
KR101872249B1
KR101872249B1 KR1020170029472A KR20170029472A KR101872249B1 KR 101872249 B1 KR101872249 B1 KR 101872249B1 KR 1020170029472 A KR1020170029472 A KR 1020170029472A KR 20170029472 A KR20170029472 A KR 20170029472A KR 101872249 B1 KR101872249 B1 KR 101872249B1
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KR
South Korea
Prior art keywords
yoke
pipe joint
pipe
heat treatment
forming
Prior art date
Application number
KR1020170029472A
Other languages
Korean (ko)
Inventor
신태중
Original Assignee
주식회사 코우
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Priority to KR1020170029472A priority Critical patent/KR101872249B1/en
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    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/027—Trimming
    • 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
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/11—Joints, e.g. ball joints, universal joints

Abstract

The method for manufacturing a pipe joint of a universal joint for a vehicle according to the present invention comprises the steps of forming a pipe joint (P) composed of a pipe portion (100) and a yoke portion (200) by inserting a material into a die and press- (S10) of forming a spline 110 inside the yoke part (100), a solidifying step (S10) of forming a yoke part (200) A nitriding heat treatment step S30 for forming a nitrided layer by nitriding heat treatment of the yoke part 200 and the pipe part 100 on which the spin coating film 210 is formed; A trimming step S40 in which the nitrided layer formed on the upper end of the yoke portion 200 is removed by the nitriding heat treatment step S30 and the end portion 220 of the upper end of the yoke portion 200 is curved, And a piercing step (S60) of forming a through hole (230) penetrating the outer surface and the inner surface of the yoke (200) All.
The present invention is characterized in that a coating liquid is applied to a yoke portion of a pipe joint in which a pipe and a yoke are integrally formed and the upper end of the yoke portion is trimmed after nitriding heat treatment of the pipe joint to perfectly complete the nitrided layer produced by nitriding heat treatment It is possible to prevent the upper end of the yoke from being deformed or cracked when the bearing is assembled to the yoke portion and to improve the corrosion resistance on the surface of the pipe joint by forming an oxide coating layer on the surface of the pipe joint after trimming the upper end portion of the yoke .

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a pipe joint of a universal joint for a vehicle,

More particularly, the present invention relates to a method for manufacturing a pipe joint of a universal joint for an automobile, and more particularly, to a method of manufacturing a pipe joint of a universal joint for automobile by applying a coating liquid to a yoke portion, nitriding heat treatment of the pipe joint, trimming the end portion of the yoke upper end, The present invention relates to a method for manufacturing a pipe joint of a universal joint for automobiles, which can prevent deformation and cracks at the upper end of a yoke when assembling a bearing to a yoke.

Generally, the vehicle is provided with a steering device for the driver to adjust the traveling direction of the vehicle.

The steering apparatus of the vehicle includes a steering wheel installed at the front of the driver's seat for changing the traveling direction of the vehicle by a driver's operation, a steering column provided at a lower portion of the steering wheel, A gear box for changing the direction of the tire by increasing the steering force and a universal joint for transmitting the rotational force transmitted to the steering column to the gear box.

The universal joint consists of a shaft joint and a pipe joint that is slidably movable to the shaft joint and assembled to transmit rotational torque.

A spline corresponding to the spline is formed on the inner side of the pipe joint so that the pipe joint is connected to the shaft joint by a gear engagement so as to transmit the rotation torque and slip in the axial direction .

At each end of the pipe joint, a yoke portion is formed and connected to the gear box.

In recent years, such pipe joints have been molded into a structure in which the yoke portion is integrally formed by using cold forging.

Prior art of such a universal joint for automobiles is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0129773 entitled " Pipe joint of universal joint for automobile and method of manufacturing thereof ", published on November 29, 2013.

In the pipe joint of the universal joint for automobiles of Korean Patent Laid-Open Publication No. 10-2013-0129773 and a method of manufacturing the same, a pipe joint made of a pipe portion and a yoke portion is formed by inserting a material into a die and press- The burrs are removed, the splines are formed on the inner surface of the pipe section, the splines are subjected to nitriding heat treatment so that the strength and abrasion resistance of the splines can be placed, and the connection holes are formed in the yoke portions.

In the case where the nitriding layer remains in the vicinity of the yoke portion, particularly around the end portion of the upper end of the yoke portion by the nitriding heat treatment, the nitriding layer generates a hardened layer at the upper end of the yoke portion, Therefore, it is necessary to perform nitriding heat treatment only on the pipe portion without performing nitriding heat treatment on the yoke portion. However, since the conventional pipe joint manufacturing method Since the yoke portion is integrally formed, the nitriding heat treatment can not be performed only on the pipe portion, and there is a problem that deformation and cracks are generated at the upper end of the yoke portion.

In order to solve this problem, Korean Unexamined Patent Publication No. 10-2013-0129774 entitled " Universal joint for automobile and its manufacturing method "(Date of publication: 2011.11.29) discloses a method of forming a plating layer for blocking a nitriding heat treatment in a yoke part, There is disclosed a partial heat treatment method in which a nitriding heat treatment is performed so that a nitrided layer is not formed in the yoke portion and a nitrided layer is formed only in the pipe portion by nitriding heat treatment.

However, since the conventional partial heat treatment method requires plating after degreasing - washing - pickling - washing with water to form a plating layer, the work process is complicated and the thickness of the plating layer must be precisely controlled, .

In order to solve the above problem, Korean Patent Registration No. 10-1683180 entitled " Method for cutting off the heat treatment of the yoke part of a universal joint for a steering device "(registered on May 31, 2016) There is disclosed a yoke portion heat treatment interruption method in which a yoke portion is uniformly dispersed in a universal joint and then the joint is subjected to nitriding treatment so that the yoke portion is not nitrided.

Although the prior art can prevent the occurrence of a nitrided layer in the yoke portion by treating the yoke portion with a spinning solution before the nitriding treatment, the nitrided layer still remains at the top of the yoke portion, particularly the yoke portion, And the upper portion of the yoke is deformed or cracked due to the tensile force generated when the bearing is assembled by the nitride layer remaining on the upper end of the yoke portion.

Korean Unexamined Patent Application Publication No. 10-2013-0129773 entitled " Pipe Joint of Universal Joint for Automobile and Method of Manufacturing the Same "(Publication Date: November 29, 2013) Korean Unexamined Patent Application Publication No. 10-2013-0129774 entitled "Universal joint for automobile and method for manufacturing the same" (Publication date: November 29, 2013) Korean Registered Patent No. 10-1683180 entitled " Method for preventing heat treatment of yoke portion of universal joint for steering device "(Registered on Nov. 2016)

An object of the present invention is to provide a method of manufacturing a pipe joint by applying a coating liquid to a yoke portion of a pipe joint in which a pipe and a yoke are integrally formed and nitriding heat treatment of the pipe joint, And a method of manufacturing a pipe joint of a universal joint for a vehicle that can prevent deformation and cracks at the top of a yoke when assembling a bearing to a yoke by removing the layer.

It is still another object of the present invention to provide a method of manufacturing a pipe joint of a universal joint for a vehicle, which can improve the corrosion resistance of a pipe joint by trimming the upper end of the yoke and forming an oxide layer on the surface of the pipe joint.

In order to achieve the above object, a method of manufacturing a pipe joint of a universal joint for a vehicle according to the present invention comprises the steps of: forming a pipe joint comprising a pipe portion and a yoke portion by inserting a material into a die and press- A pipe joint forming step of forming a spline on the pipe joint; A surface treatment step of applying the yoke part with a coating liquid to form a permeable membrane only on the yoke part; A nitriding heat treatment step of nitriding the yoke portion and the pipe portion formed with the permeable membrane to form a nitrided layer; A trimming step of trimming the upper end of the yoke portion to remove the nitrided layer formed on the upper end of the yoke by the nitridation heat treatment step to form a curved upper end of the yoke portion; An oxidation treatment step of forming an oxide coating layer on the pipe joint surface after the trimming step; And a piercing step of forming a through hole passing through an outer surface and an inner surface of the yoke portion.

delete

The method for manufacturing a pipe joint of a universal joint for a vehicle according to the present invention is a method for manufacturing a pipe joint of an automobile by applying a coating liquid to a yoke portion of a pipe joint in which a pipe and a yoke are integrally formed and nitriding the pipe joint, It is possible to completely remove the nitrided layer produced by the nitriding heat treatment to prevent deformation and cracks on the upper end of the yoke when the bearing is assembled to the yoke and to form an oxide layer on the surface of the pipe joint after trimming the upper end of the yoke Thereby improving the corrosion resistance on the surface of the pipe joint.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a process for manufacturing a pipe joint of a universal joint for a vehicle according to the present invention;
2 is a perspective view of a pipe joint formed by the pipe joint forming step of the present invention,
Fig. 3 is a perspective view of a pipe joint after the preservation treatment step of the present invention. Fig.
Figure 4 is a perspective view of a pipe joint after the trimming step of the present invention,
FIG. 5 is an enlarged view of a portion of FIG. 4,
6 is a perspective view of a pipe joint in which a through hole is formed in a yoke portion.

Hereinafter, a method of manufacturing a pipe joint of a universal joint for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

1, a method for manufacturing a pipe joint of a universal joint for a vehicle according to the present invention comprises the steps of inserting a material into a dice and pressing and plastic-deforming the material with a punch to form a pipe joint P composed of the pipe portion 100 and the yoke portion 200 A pipe joint forming step S10 of forming a spline 110 inside the pipe section 100 after the molding of the yoke part 200 and the yoke part 200 are performed by applying a coating liquid to the yoke part 200, A nitriding heat treatment step S30 for forming a nitrided layer by nitriding heat treatment on the yoke part 200 and the pipe part 100 on which the spin coating film 210 is formed, The upper end 220 of the yoke 200 is trimmed so that the nitrided layer formed on the upper end of the yoke 200 is removed by the nitriding heat treatment step S30 and the upper end 220 of the yoke 200 is bent After the trimming step (S40) and the trimming step (S40), an oxide film layer is formed on the surface of the pipe joint (P) Which consists of a piercing step (S60) of forming a through-hole 230 penetrating the outer and inner surfaces of the oxidation treatment step (S50), and a yoke portion (200).

delete

The operation of the pipe joint manufacturing method of universal joint for automobile according to the present invention is as follows.

As shown in FIG. 2, the pipe joint forming step S10 is a step of forming a pipe joint by sequentially moving the dies sequentially installed with the single-piece material having the predetermined diameter and the length of which are closed and punching them in a direction corresponding to each of the dies. And a spline 110 is formed inside the pipe portion 100 of the formed pipe joint P by molding the pipe joint P in which the pipe portion 100 and the yoke portion 200 are integrally formed by press- do.

3, the surface treatment step S20 includes applying the spinning solution on the surface of the yoke portion 200 of the pipe joint P where the splines 110 are formed to form the spin coating film 210 only on the yoke portion 200 ).

In the method of applying the coating liquid on the surface of the yoke portion 200, the yoke portion 200 is immersed in the coating liquid by a general dipping method so that the coating liquid is uniformly deposited on the surface of the yoke portion 200.

The spinning solution is a liquid solution for preventing gas nitrification. The spinning film 210 formed by a spinning solution formed on the surface of the yoke 200 is subjected to a nitriding heat treatment step (S30) It is not possible to coat the entire surface of the yoke 200 with the spinning solution depending on the composition of the spinning solution and the dipping conditions in the spinning treatment step S20, S30), a nitride layer may be formed in the yoke portion 200. [ In particular, when the end portion 220 of the upper end of the yoke portion 200 has a nitrided layer, a hardened layer is formed at the upper end of the yoke portion 200 by the nitrided layer, Or cracks may occur.

In the nitriding heat treatment step S30, the yoke part 200 having the spin coating film 210 and the pipe part 100 are subjected to a nitriding heat treatment to form a nitrided layer.

 The nitriding heat treatment step (S30) is a technique of heat treating the metal surface to produce a nitrided layer having high hardness on the surface of the metal and high corrosion resistance and abrasion resistance.

4 and 5, the trimming step S40 includes trimming the upper end 220 of the upper end of the yoke 200 to form the upper end 220 of the yoke 200 to be curved The nitrided layer formed on the upper portion of the yoke 200 can be completely removed by the nitriding heat treatment step S30 by trimming the upper end 220 of the yoke portion 200. [

As described above, since there is no nitride layer at the top of the yoke portion 200, deformation and cracks at the upper end of the yoke portion due to the nitride layer are not generated.

The oxidation treatment step (S50) is to form an oxide coating layer on the surface of the pipe joint (P) after the trimming step (S40), and the corrosion resistance of the pipe joint (P) can be improved by the oxide coating layer.

In the oxidation treatment step S50, steam is injected into the completed pipe joint P after the trimming step S40, and an oxide film is formed by bonding with the oxygen of the pipe joint P and the water vapor.

That is, in the nitriding heat treatment step (S30), Porus is formed at the outermost periphery of the surface compound layer of the pipe joint P, oxygen enters into the porous hole and is present as iron oxide, (Fe 3 O 4) is formed on the surface of the metal of the substrate P.

6, the piercing step S60 forms a through hole 230 passing through the outer surface and the inner surface of the yoke 200 using a general cutting method.

A fixing groove 120 is formed in the lower part of the pipe part 100 by a general cutting process along the circumferential surface of the pipe part 100 so that foreign matter or the like flows into the fixing part 120 inside the pipe part 100 It is also possible to fix the dust cap for preventing the dust cap.

100: pipe section 110: spline
120: fixing groove 200: yoke portion
210: a barrier film 230: a through hole
P: pipe joint

Claims (2)

A pipe joint P formed of a pipe portion 100 and a yoke portion 200 is formed by inserting a material into a die and punching and deforming the material by a punch to form a spline 110 inside the pipe portion 100 Forming a pipe joint (S10);
(S20) of coating the yoke part (200) with a coating liquid to form a spin coating film (210) only on the yoke part (200);
A nitriding heat treatment step (S30) of forming a nitrided layer by nitriding heat treatment of the yoke part (200) and the pipe part (100) in which the spin coating film (210) is formed;
The end portion 220 of the upper end of the yoke portion 200 is trimmed and the nitrided layer formed on the upper end of the yoke portion 200 is removed by the nitridation heat treatment step S30, 220) in a curved shape;
An oxidation treatment step (S50) of forming an oxide coating layer on the surface of the pipe joint (P) after the trimming step (S40); And
And a piercing step (S60) of forming a through hole (230) passing through an outer surface and an inner surface of the yoke part (200). delete
KR1020170029472A 2017-03-08 2017-03-08 Manufacturing method of pipe joint of universal joint for vehicle KR101872249B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200080000A (en) 2018-12-26 2020-07-06 박준일 Manufacturing method of integral pipe joint of yoke part of automobile universal joint

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05172248A (en) * 1991-12-25 1993-07-09 Riken Corp Piston ring and manufacture thereof
KR20110138658A (en) * 2010-06-21 2011-12-28 주식회사 진양이엔지 Manufacturing method of ball head pin for vessel engine
KR20130129773A (en) 2012-05-21 2013-11-29 주식회사 드림텍 Pipe joint of universal joint for vehicle and manufacturing method thereof
KR20130129774A (en) 2012-05-21 2013-11-29 주식회사 드림텍 Universal joint for vehicle and manufacturing method thereof
KR20140024080A (en) * 2012-08-16 2014-02-28 주식회사 드림텍 Universal joint for vehicle and manufacturing method thereof
KR101683180B1 (en) 2016-05-30 2016-12-07 (주)태선 Method for preventing heat-treated yoke of the universal joint for steering devices

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05172248A (en) * 1991-12-25 1993-07-09 Riken Corp Piston ring and manufacture thereof
KR20110138658A (en) * 2010-06-21 2011-12-28 주식회사 진양이엔지 Manufacturing method of ball head pin for vessel engine
KR20130129773A (en) 2012-05-21 2013-11-29 주식회사 드림텍 Pipe joint of universal joint for vehicle and manufacturing method thereof
KR20130129774A (en) 2012-05-21 2013-11-29 주식회사 드림텍 Universal joint for vehicle and manufacturing method thereof
KR20140024080A (en) * 2012-08-16 2014-02-28 주식회사 드림텍 Universal joint for vehicle and manufacturing method thereof
KR101683180B1 (en) 2016-05-30 2016-12-07 (주)태선 Method for preventing heat-treated yoke of the universal joint for steering devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200080000A (en) 2018-12-26 2020-07-06 박준일 Manufacturing method of integral pipe joint of yoke part of automobile universal joint
KR102188802B1 (en) * 2018-12-26 2020-12-09 박준일 Manufacturing method of integral pipe joint of yoke part of automobile universal joint

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