KR20160006431A - Manufacturing method of pipe joint for automobile steering apparatus - Google Patents

Manufacturing method of pipe joint for automobile steering apparatus Download PDF

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Publication number
KR20160006431A
KR20160006431A KR1020140085983A KR20140085983A KR20160006431A KR 20160006431 A KR20160006431 A KR 20160006431A KR 1020140085983 A KR1020140085983 A KR 1020140085983A KR 20140085983 A KR20140085983 A KR 20140085983A KR 20160006431 A KR20160006431 A KR 20160006431A
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KR
South Korea
Prior art keywords
yoke
die
forming
inner diameter
pipe joint
Prior art date
Application number
KR1020140085983A
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Korean (ko)
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KR101632702B1 (en
Inventor
김정현
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(주)성진포머
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.)
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Application filed by (주)성진포머 filed Critical (주)성진포머
Priority to KR1020140085983A priority Critical patent/KR101632702B1/en
Priority to PCT/KR2015/003809 priority patent/WO2016006803A1/en
Publication of KR20160006431A publication Critical patent/KR20160006431A/en
Application granted granted Critical
Publication of KR101632702B1 publication Critical patent/KR101632702B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/20—Connecting steering column to steering gear

Abstract

The present invention relates to a method of manufacturing a pipe joint for an automotive steering apparatus, in particular, a method of manufacturing a pipe joint by extruding a pipe joint through a foaming process, wherein an inner diameter hole is first formed in a cut material, So that the productivity can be expected to be improved along with the shortening of the process.
As a means for solving the above-mentioned problems, the present invention provides a method for manufacturing a dicing machine, which comprises a center groove forming step for feeding a material cut to a predetermined length into a die of a former type to prevent occurrence of an inner diameter shake, A yoke forming step of forming a U-shaped yoke by lengthening an inner diameter hole in the material, and a step of forming a U- The pipe joint is subjected to extrusion molding through a concave-convex spline forming process on a tube body having an inner diameter hole formed therein.

Description

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

The present invention relates to a method of manufacturing a pipe joint for an automotive steering apparatus, in particular, a method of manufacturing a pipe joint by extruding a pipe joint through a foaming process, wherein an inner diameter hole is first formed in a cut material, So that the productivity can be expected to be improved along with the shortening of the process.

2. Description of the Related Art Generally, an automotive steering system includes a steering wheel for turning a direction by a driver's manipulation, a steering column disposed under the steering wheel, and a steering column for changing the direction of the tire, A gear box, and a universal joint for transmitting the rotational force transmitted to the steering column to the gear box.

The universal joint is composed of a shaft joint and a pipe joint that transmits a rotational force to the shaft joint. At this time, a spline constituted by a concavo-convex shape on the outer surface of the shaft joint is engaged with a spline formed as a concavo- And is configured to be movable in the axial direction.

The yoke constituting the shaft joint is connected to the steering column, the yoke constituted by the pipe joint is connected to the gear box, and the shaft joint and the pipe joint constituting the universal joint are subjected to a cold forging process .

Considering the prior art relating to a pipe joint formed through a cold forging process, Patent Application No. 10-2005-0038468 entitled " Automobile Universal Joint and Method of Manufacturing ", Patent Application No. 10- 0053881 "a method for manufacturing a pipe joint of a universal joint for automobiles (Patent Document 2), and the like.

The shaft joint molding process in which a material having a predetermined length and appearance is inserted into a die that performs a role of a metal mold and is subjected to pressure plastic transformation with a punch to integrally form a shaft portion and a yoke portion, A hole machining step of machining a connection hole to connect another joint such as a spider to the yoke part of the shaft joint, a step of forming a gear on the outer side surface of the shaft part, a step of forming a material having a predetermined length and outer appearance, And then press-plastic-deforms with a punch so as to integrally mold the pipe and the yoke portion into which the shaft portion is inserted, and a pipe joint forming step of connecting a yoke portion of the formed pipe joint with another joint such as a spider A hole machining step for machining a hole, a shaft part A step of forming a spline corresponding to the gear, and an assembling step of inserting the shaft portion of each of the manufactured shaft joints into a pipe portion of the pipe joint so as to have a completed universal joint shape .

[0006] Considering the technical contents of Patent Document 2, a first step of molding a pipe joint composed of a pipe portion and a yoke portion by inserting a material into a die and subjecting it to pressure plastic deformation, a method of removing a burr of a yoke generated in the first step A third step of fixing the pipe section to a die having a shape corresponding to the shape of the spline and pressing the pipe section with a punch having a shape of a spline to form a spline on the pipe; A pipe joint of a universal joint for automobiles is manufactured by a fourth step of machining a connecting hole.

Examining the molding process of the pipe joint provided in the Patent Documents 1 and 2, the process of forming the yoke portion first, then forming the inner diameter hole at one side of the yoke portion to have a pipe shape, and forming the spline in the pipe Pipe joints are manufactured.

However, when the tubular inner diameter hole is formed in the shaft after the yoke is first formed, it is difficult to accurately set the inner diameter hole forming the pipe, and the yoke portion may be deformed in the process of forming the inner diameter hole.

Patent Application No. 10-2005-0038468 "Automobile Universal Joint < Patent Application No. 10-2012-0053881 "Manufacturing Method of Pipe Joint of Universal Joint for Automobile"

A pipe joint for an automotive steering apparatus is extrusion-molded through a forming process. The inner hole and the yoke formed in the pipe joint can be precisely machined, and the tube outer-surface spline is formed As a result, process shortening and productivity improvement can be expected.

As a means for solving the above-mentioned problems, the present invention provides a method for manufacturing a dicing machine, which comprises a center groove forming step for feeding a material cut to a predetermined length into a die of a former type to prevent occurrence of an inner diameter shake, A yoke forming step of forming a U-shaped yoke by lengthening an inner diameter hole in the material, a step of forming a U- The pipe joint is subjected to extrusion molding through a concave-convex spline forming process on a tube body having an inner diameter hole formed therein.

The present invention relates to a method of manufacturing a dental casting machine, which comprises a center groove forming step for supplying a material cut to a predetermined length to a die of a former die to prevent occurrence of an inner diameter shake, a first and second die for extruding an inner diameter hole by step- A rear yoke molding step of forming a U-shaped yoke by extending an inner-diameter hole in the material; a step of forming a U- By forming the pipe joint by extrusion molding through the spline forming process, the inner hole and the yoke formed in the pipe joint can be precisely machined, and the tube outer surface spline is formed in the last forming step, It is possible to expect an improvement.

1: Block diagram of the foaming process of the present invention
Fig. 2: A state in which the central groove is formed on one side of the material for the present invention
Fig. 3: State in which the inner diameter hole is formed on the inner surface of the material in the state of Fig. 2
4: A state in which the inner diameter hole is extended and formed in the state of FIG. 3
Fig. 5 shows a state in which the spare yoke is formed on one side of the work piece in the state of Fig. 4
Fig. 6 shows a state in which the yoke is molded and the inner diameter hole is formed by extension in the state of Fig. 5
7: A state in which the spline is formed on the outer surface of the tube in the state of Fig. 6
8 is a cross-sectional view of a spline portion constituting a pipe joint of the present invention

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

The present invention relates to a method of manufacturing a pipe joint for an automotive steering system, in which a material supplied from one side of a forming machine is cut to a desired length to obtain a material, and the cut material is subjected to a center groove forming process (S1) And the spline forming step S6 in the first backward extrusion molding step S2, the second backward extrusion molding step S3, the yoke preliminary molding step S4, the yoke molding step S5, In a stepwise manner.

The manufacturing process of the pipe joint 10 to be provided in the present invention will be described step by step.

FIG. 1 is a block diagram of the manufacturing process of the present invention. FIG. 2 to FIG. 7 illustrate a process for manufacturing a pipe joint 10 for an automobile. The cold forging process is formed The inner diameter holes are first formed in the cut material, the yoke is formed, and the spline is formed in the final step. The manufacturing process of the spline will be described step by step.

The central groove forming step (S1) is as follows.

2 is a process for molding the center groove 21 on one side of the material 20 cut from the material supplied from one side of the forming machine (not shown) to a predetermined length by using a cutter.

The cutting length of the workpiece 20 is calculated by calculating the length and volume of the pipe joint 10 to be cut and cutting the workpiece 20 to an accurate length.

The cut material 20 is fed to a front side of a center groove forming die (not shown) for forming a center groove 21 through a conveying device constituted by a forming machine and then pressurized by a punch to form a center groove 21 ).

The center groove 21 is formed by using a die pin on the inner surface of the workpiece 20 in a subsequent process so that the inner diameter hole can be formed at an accurate position without shaking when the inner diameter hole is formed.

The first rear extrusion molding step (S2) will be described.

The material 20 press-molded with the center groove 21 on one side of the material 20 is placed in front of the first rear extrusion die (not shown) through the transfer device, and the die pin is moved forward by moving the die Diameter hole 31 having a predetermined depth is formed on the inner surface of one side of the pipe 20 so that the pipe 30 is relatively formed.

In the above process, when the die pin is advanced to press the inner diameter hole 31 on one side of the workpiece 20, the die pin is guided by the center groove 21 so that the inner diameter hole 31 is formed at the correct position without fluctuation of the inner diameter At this time, the length of the inner diameter hole 31 is formed to be shorter than the length of the completed inner diameter hole of the pipe shaft 10, so that the material and the die pin are not overloaded.

The secondary rear extrusion molding step (S3) will be described.

The material 20 in which the inner diameter hole 21 is formed at one side of the material 20 is placed in front of the secondary extrusion die (not shown) using a transfer device in the first backward extrusion molding step S2, The die pin is moved forward so that the length of the inner diameter hole 31 formed at one side of the blank 20 becomes longer.

The yoke preforming step (S4) will be described.

The secondary extruded material 20 is placed in front of the yoke preformed dies (not shown) using a transferring device and is pushed by the punch in the above-described state to the opposite side of the material 20 on which the inner diameter holes 31 are formed The guide groove 41 is formed at the center of the preliminary yoke 40 'so that the yoke 40 is formed with a precise shape when the yoke is formed by a yoke forming punch in a subsequent step To be formed.

In addition, the yoke 40 is formed in a subsequent step after the preliminary yoke 40 'is formed at one side of the blank 20 in the yoke preliminary forming step (S4), so that the material to be formed by cold forging Thereby reducing the fatigue and at the same time preventing the bunch from being transferred to the yoke forming punch.

The yoke forming step (S5) will be described.

After the yoke preforming step S4 has been completed, the workpiece 20 is placed in front of the yoke forming die (not shown) through a transfer device and is pressed by a yoke forming punch in the above-described state to form a U- 42 are formed, and at the same time, the inner diameter hole 31 is completely formed by the die pin.

In the yoke forming step S5, when a yoke forming punch is used which has a square shape when molding the yoke 40, the pressure applied to the punching die is reduced to increase the service life and smooth molding of the yoke 40 It is possible.

The molding of the inner diameter hole 31, the pipe 30 and the yoke 40 is completed in the work 20 when the yoke forming step S5 is completed.

The spline forming step (S6) will be described.

In this step, as a final step of forming, a concave-convex spline 50 is formed on the outer surface of the pipe 30 that has been formed in the yoke forming step (S5) so that the spline of the shaft joint is engaged when used in an automotive steering system, So that it can be moved in the axial direction.

That is, the material 20 after the yoke forming step S5 using the transfer device is inserted into the spline die, and the spline 50 is formed on the pipe 30 by pressing with the spline punch. Thus, The molding of the pipe joint 10 is completed.

Various types of splines are formed according to the shape of the spline forming punch used in the spline forming step (S6).

As described above, according to the present invention, the central groove 21 is formed on one side of the cut material 20, the material 20 is sequentially transferred to the first and second backward extrusion dies, The preformed yoke 40 'is molded on one side of the workpiece 20 and the molded workpiece 40' is molded into a spline die. Then, a spline molding punch is used to form a spline 50 The process of manufacturing the pipe joint 10 is completed through the single step of forming, so that the product production schedule can be shortened together with the process shortening.

In particular, according to the invention, the inner diameter hole 21 is formed first in the material 20, then the yoke 40 is molded, and the spline 50 is formed again so that the inner diameter hole 21 formed in the pipe joint 10, Not only the position of the yoke can be precisely set, but also the distortion of the yoke can be prevented by forming the yoke molding at the final stage.

(S1) - Center groove forming process (S2) - First rear extrusion molding process
(S3) - Second rear extrusion molding step (S4) - Yoke pre-forming step
(S5) - York forming step (S6) - Spline forming step
(10) - Pipe joint (20) - Material
(21) - center groove (30) - pipe
(31) - inner diameter hole (40) - yoke
(40 ') - spare yoke (41) - guide groove
(42) - connecting groove (50) - spline

Claims (1)

The cut material (20) is produced by cutting a material supplied from one side of the forming machine to obtain a material, and then the material is sequentially transferred through a transfer device of a forming machine to be molded. A center grooving step S1 for supplying a center groove forming die to a center groove forming die through a transferring device and then pressing the center groove forming die at one side of the material 20 by punching; A first backward extrusion molding step (S2) for positioning the inner diameter hole (31) and the pipe (30) at one side of the material (20) by moving the die pin forward after positioning it at the front side of the first rear extrusion die, (S3) for positioning the inner diameter hole (31) in the inner side of the die (31) by positioning the die (20) in front of the second rear extrusion die through a transfer device and moving the die pin forward; (20) through a transfer device A yoke preliminary molding step (S4) for forming a preliminary yoke (40 ') having a guide groove (41) formed at one side of the work (20) by positioning the work (20) in front of the yoke preforming die, Is placed in front of the yoke molding die through a transfer device and then pressurized by a yoke forming punch to mold the yoke 40 having the connecting groove 42 formed therein and to mold the inner diameter hole 31 with the die pin (50) is formed on the pipe (30) by pressing the material (20) into a spline die and pressing it with a spline-shaped punch A method of manufacturing a pipe joint.
KR1020140085983A 2014-07-09 2014-07-09 Manufacturing method of pipe joint for automobile steering apparatus KR101632702B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020140085983A KR101632702B1 (en) 2014-07-09 2014-07-09 Manufacturing method of pipe joint for automobile steering apparatus
PCT/KR2015/003809 WO2016006803A1 (en) 2014-07-09 2015-04-16 Method for manufacturing pipe joint for vehicle steering system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140085983A KR101632702B1 (en) 2014-07-09 2014-07-09 Manufacturing method of pipe joint for automobile steering apparatus

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KR20160006431A true KR20160006431A (en) 2016-01-19
KR101632702B1 KR101632702B1 (en) 2016-06-22

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WO (1) WO2016006803A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101685497B1 (en) * 2016-05-09 2016-12-13 (주)성진포머 Method for manufacturing tube yoke
KR101685496B1 (en) * 2016-05-09 2016-12-13 (주)성진포머 Apparatus for manufacturing tube yoke
KR20190036953A (en) * 2017-09-28 2019-04-05 남양넥스모 주식회사 Inner shaft of universal joint for vehicle and method for manufacturing the same, and universal joint for vehicle
EP3603845A4 (en) * 2017-03-27 2021-03-31 NSK Ltd. Shaft for steering device, method for producing shaft for steering device, and electric power steering device

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WO2018070758A1 (en) 2016-10-11 2018-04-19 이양화 Method for manufacturing universal joint using pipe
KR101930335B1 (en) * 2016-10-11 2018-12-19 이양화 Universal joint manufacturing method using the pipe
JP7215159B2 (en) * 2018-12-26 2023-01-31 株式会社ジェイテクト Method for manufacturing outer joint member
KR102436815B1 (en) * 2021-01-27 2022-08-29 주식회사 코우 Method of manufacturing hollow type yoke shaft

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KR20060116099A (en) * 2005-05-09 2006-11-14 주식회사 드림텍 Universal joint for vehicle and manufacturing method thereof
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Cited By (10)

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Publication number Priority date Publication date Assignee Title
KR101685497B1 (en) * 2016-05-09 2016-12-13 (주)성진포머 Method for manufacturing tube yoke
KR101685496B1 (en) * 2016-05-09 2016-12-13 (주)성진포머 Apparatus for manufacturing tube yoke
WO2017195950A1 (en) * 2016-05-09 2017-11-16 (주)성진포머 Apparatus for manufacturing tube yoke
WO2017195949A1 (en) * 2016-05-09 2017-11-16 (주)성진포머 Method for manufacturing tube yoke
CN107438466A (en) * 2016-05-09 2017-12-05 株式会社成进Fo-Ma Pipe yoke manufacture method
CN107708889A (en) * 2016-05-09 2018-02-16 株式会社成进Fo-Ma Pipe yoke manufacturing equipment
CN107708889B (en) * 2016-05-09 2019-11-26 株式会社成进Fo-Ma Pipe yoke manufacturing equipment
EP3603845A4 (en) * 2017-03-27 2021-03-31 NSK Ltd. Shaft for steering device, method for producing shaft for steering device, and electric power steering device
US11541450B2 (en) 2017-03-27 2023-01-03 Nsk Ltd. Shaft for steering device, method of manufacturing shaft for steering device, and electric power steering device
KR20190036953A (en) * 2017-09-28 2019-04-05 남양넥스모 주식회사 Inner shaft of universal joint for vehicle and method for manufacturing the same, and universal joint for vehicle

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