KR101646363B1 - Manufacturing method of hollow shaft for vehicle having a small hollowness diameter - Google Patents

Manufacturing method of hollow shaft for vehicle having a small hollowness diameter Download PDF

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Publication number
KR101646363B1
KR101646363B1 KR1020140143256A KR20140143256A KR101646363B1 KR 101646363 B1 KR101646363 B1 KR 101646363B1 KR 1020140143256 A KR1020140143256 A KR 1020140143256A KR 20140143256 A KR20140143256 A KR 20140143256A KR 101646363 B1 KR101646363 B1 KR 101646363B1
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South Korea
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blank
mandrel
hollow
forging
forming step
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KR1020140143256A
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Korean (ko)
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KR20160047625A (en
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조재민
서정동
김봉진
이차환
이성철
조혜민
조봉래
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현대위아 주식회사
현대자동차주식회사
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Priority to KR1020140143256A priority Critical patent/KR101646363B1/en
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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a hollow shaft for a vehicle having a hollow having a small diameter for forming a hollow shaft having an inner diameter smaller than the diameter of the mandrel in manufacturing a hollow shaft using radial forging.
The method for manufacturing a hollow shaft for a vehicle having a hollow having a small diameter according to the present invention comprises the steps of: heating a hollow formed with a hollow; inserting a mandrel inside the blank to place the hollow between the plurality of forging tools; A first shaping step of clamping and rotating the tip end of the blank, continuously pressing the outer circumferential surface of the blank with the plurality of forging tools to form the blank, and moving the blank in a direction perpendicular to the pressing direction of the forging tool; A second forming step of moving the mandrel at a speed higher than the moving speed of the blank in a direction opposite to the moving direction of the blank before drawing the blank out of the blank before the blanking is completed; And forming a hollow portion having a diameter smaller than an outer diameter of the mandrel by press-molding the rear end portion of the blank completed with the second forming step with the forging tool so as to move the blank in a direction orthogonal to the pressing direction of the forging tool The first forming step and the third forming step are carried out while supporting the inner circumferential surface while clamping the outer circumferential surface of the front end of the blank.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hollow shaft for a vehicle having a hollow having a small diameter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hollow shaft for a vehicle having a hollow having a small diameter and, more particularly, to a hollow shaft having a diameter To a method of manufacturing a hollow shaft for a vehicle having such a small hollow.

Since the shaft is a part necessary for power transmission and requires high rigidity and high durability, it is general to manufacture the forged material after heat treatment and processing.

However, the shaft manufactured through forging has a disadvantage in that the weight is very heavy because it is a solid shaft filled with the inside, and vibration and noise are generated due to a resonance phenomenon according to a low natural frequency at high speed rotation, Quality problems.

In order to compensate for these drawbacks, if the inner diameter part is machined, the manufacturing cost becomes very high due to the addition of the machining step.

In addition, the solid shaft has a disadvantage in that the metal flow is uneven, and when the metal flow is nonuniform, it adversely affects the rigidity and durability of the shaft that transmits power.

In order to solve such a problem, a hollow shaft having an inner hollow is manufactured and applied to a vehicle. However, it is very difficult to manufacture a hollow shaft by general forging because of its shape.

The most effective method for manufacturing a hollow shaft is known as radial purging, and it has been popular recently.

As shown in FIG. 1, after the mandrel 20 is inserted into a blank (BLANK) 10 having a predetermined shape, the radial filling is performed by using a forging tool 30 located in the four directions, A hollow shaft having an inner hollow is manufactured by continuously blowing the hollow shaft. The inner shaft and the outer shaft are formed into a multi-stage structure. (In FIG. 1, Respectively.

As shown in FIG. 2, the radial punching fixes the position of the forging tool 30 and the mandrel 20 and clamps (not shown) the leading end 40 of the blank 10, The mandrel 20 located inside the blank 10 needs to be drawn out to the outside of the blank 10 so that the end of the mandrel 20 at which the mandrel 20 is pulled out The inner diameter of the blank 10 located at the center of the mandrel 20 is always larger than the diameter of the mandrel 20.

That is, since the inner diameter of the rear end of the produced hollow shaft is always larger than the diameter of the mandrel 20, the shape that can be manufactured is very limited.

As a conventional technique related to such radial positioning, there is a " method for manufacturing a hollow body having an inner surface with a circular cross section "(Patent Laid-Open No. 10-2012-0135835).

The conventional "hollow body manufacturing method having an inner surface with a circular cross section" includes a perforating step of perforating the round bar and a forging step of forging the hollow member perforated in the perforating step. In the forging step, The radial forging is characterized in that the hollow member is held on both sides by a forging chuck and the mandrel is inserted and supported by the inner diameter, and the outer diameter surface of the hollow member is struck from the radially outer side with a plurality of forging tools.

However, there is also a problem in that it is impossible to form the rear end portion 50 having an inner diameter smaller than the diameter of the mandrel, as shown in Fig. 3, also in the "Hollow body manufacturing method having an inner surface with a circular cross section ".

Korean Patent Laid-Open No. 10-2012-0135835 (December 17, 2012)

In order to solve such a conventional problem, the present invention provides a method of manufacturing a hollow shaft using a radial forging, wherein a hollow shaft having an inner diameter smaller than the diameter of the mandrel can be formed by selectively using a mandrel Which has a small diameter, and which has a small diameter.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method of manufacturing a hollow shaft for a vehicle having a hollow having a small diameter, the method comprising: heating a blank having a hollow therein; inserting a mandrel in the blank; step; A first shaping step of clamping and rotating the tip end of the blank to continuously press the outer circumferential surface of the blank with the plurality of forging tools and to move the blank in a direction perpendicular to the pressing direction of the forging tool; A second forming step of moving the mandrel at a speed higher than the moving speed of the blank in a direction opposite to the moving direction of the blank before drawing the blank out of the blank before the blanking is completed; And forming a hollow portion having a diameter smaller than an outer diameter of the mandrel by press-molding the rear end portion of the blank after the second forming step with the forging tool so as to move the blank in a direction orthogonal to the pressing direction of the forging tool The first forming step and the third forming step are carried out while supporting the inner circumferential surface while clamping the outer circumferential surface of the front end of the blank.

And in the first forming step, the mandrel is gradually moved in a direction opposite to the moving direction of the blank along with the movement of the blank.

And a post-processing step of drilling a rear end inner circumferential surface of the blank in which the third forming step is completed.

And the blanks in which the third forming step is completed have a shaking tolerance of less than 0.5 mm.

delete

The present invention has the following various effects.

First, the present invention can manufacture a hollow shaft having a very small inner diameter without damaging the mandrel.

Second, since the shaking tolerance of the formed hollow shaft is very small, it is possible to secure a uniform roundness and concentricity of the hollow shaft completed through the post-processing, and to manufacture a high-precision hollow shaft for power transmission replacing the solid shaft .

Third, the present invention can minimize the generation of vibration and noise due to the high natural frequency of the hollow shaft.

Fourth, the present invention can manufacture a hollow shaft having a uniform inner diameter and an outer diameter.

Fifth, the present invention can manufacture a hollow shaft having an inner peripheral surface of a complicated shape.

Sixth, the present invention can manufacture a hollow shaft having an inner diameter smaller than the diameter of the mandrel.

Seventh, since the inner diameter of the hollow shaft can be formed in multiple stages, the present invention is advantageous in cost reduction.

1 is a diagram showing an initial setting state of radial positioning;
2 is a view showing a state in which radial pausing is being performed,
3 is a view showing an outer shape and an inner shape of a hollow shaft having a narrowed rear end,
4 is a flowchart showing a method for manufacturing a hollow shaft for a vehicle having a hollow having a small diameter according to the present invention,
5 is a cross-sectional view illustrating a preparation step according to the present invention,
6 is a cross-sectional view showing a first forming step according to the present invention,
7 is a sectional view showing a second forming step according to the present invention,
8 is a cross-sectional view showing a third forming step according to the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, and the same reference numerals are given to the background art and the constituent elements of the constitution which have already been described.

The description of the method for manufacturing a hollow shaft for a vehicle having a hollow having a small diameter according to the present invention described below is a preferred embodiment of the present invention and is not limited to the embodiment but can be implemented in various forms.

In addition, the shape, size, and the like of each constitution described below are representative examples and are not fixed, and can be variously changed if the same effect can be realized.

4, a manufacturing method of a hollow shaft for a vehicle having a hollow having a small diameter according to an embodiment of the present invention includes a preparation step P100, a first molding step S100, a second molding step S200, And a third forming step S300.

5, the preparing step P100 is a step of heating the hollow blank 10 having the hollow therein, inserting the mandrel 20 inside the blank 10, and then pressing the plurality of forging tools 30 In general, the blank 10 is manufactured in advance.

The heating of the blank 10 is carried out in order to secure the easiness of forming the blank 10, and accordingly, to reduce the molding load and the life of the mold.

Four forging tools 30 are generally used, one for each of the upper, lower, left, and right sides. In some cases, however, two forging tools 30 for pressing the upper and lower left, upper left and lower right simultaneously It is also possible to use.

6, in the first forming step S100, the front end portion 40 of the blank 10 is clamped and rotated, and the outer diameter of the blank 10 is successively pressed by the plurality of forging tools 30 And gradually moving the blank 10 positioned at the center of the plurality of forging tools 30 in the direction perpendicular to the pressing direction of the forging tool 30. [

When the blank 10 is pressed by the forging tool 30 in the first forming step S100, the forging tool 30 (not shown) is rotated so that the direction in which the blank 10 extends is opposite to the moving direction of the blank 10 The mandrel 20 located inside the blank 10 supports the inner circumferential surface of the blank 10. In this case,

The first molding step S100 also stops the movement of the blank 10 when the blank 10 is brought into contact with the forging tool 30 so that the forming of the blank 10 can be finely performed, It is preferable to move the blank 10 in a noncontact manner between the blank 10 and the mandrel 20. When the blank 10 and the mandrel 20 are moved together, It is preferable to move the movable member 20.

The blank 10 is rotated in the first forming step S100 so that the outer circumferential surface of the blank 10 can be uniformly formed in the same shape along the rotating direction, thereby minimizing the swing tolerance of the subsequent hollow shaft.

When the outer diameter of the blank 10 is pressed by the forging tool 30, the length of the blank 10 is extended by the pressing force. At this time, the blank 10 is gradually moved in the direction orthogonal to the pressing direction of the forging tool 30 The pressing position of the blank 10 is changed.

That is, the elongated portion of the blank 10 becomes the next pressing point, and as the process is repeated, the length of the blank 10 is increased.

The outer peripheral surface shape of the blank 10 can be formed into a multistage shape having a desired shape by adjusting the moving distance of the forging tool 30 in the first forming step S100, and the inner peripheral surface of the blank 10 is formed into the mandrel 20 And is formed into one end or multi-end.

If the mandrel 20 is formed in a complicated multi-step shape, the mandrel 20 is gradually moved in the direction opposite to the moving direction of the blank 10 with the movement of the blank 10, Can be effectively molded.

7, the second forming step S200 is a step in which the mandrel 20 is moved in a direction opposite to the moving direction of the blank 10 before the formation of the blank 10 is completed in the first forming step S100 Thereby moving the mandrel 20 out of the blank 10.

That is, the mandrel 20 supporting the inner peripheral surface of the blank 10 before the forming of the blank 10 on the rear end 50 side is completed during the press forming of the blank 10 using the forging tool 30, So that the inner diameter of the rear end portion 50 of the blank 10 to be formed can have a smaller value than the diameter of the mandrel 20. [

In this second forming step S200, since the blank 10 is solid rather than liquid, and is formed by the forging tool and the mandrel, even if the mandrel 20 is drawn out to the outside of the blank 10 at a high speed, (10) The inside of the rear end portion 50 of the molding is not closed but a predetermined hollow is formed.

8, in the third forming step S300, the rear end portion 50 of the blank 10 after the second forming step S200 is completed is formed by pressing with the plurality of forging tools 30, The step of gradually moving the blank 10 in the direction orthogonal to the pressing direction of the forging tool may be such that the pressing force of the forging tool 30 is applied to the blank 10 because there is no mandrel 20 in the blank 10 The outer diameter and inner diameter of the blank 10 are easily reduced.

The inner diameter of the rear end portion 50 of the blank 10 may be smaller than the diameter of the mandrel 20 by selectively removing the mandrel 20 supporting the inner circumferential surface of the blank 10, It is.

The third forming step S300 stops the movement of the blank 10 when the blank 10 is brought into contact with the forging tool 30 so that the forming of the blank 10 can be finely performed, It is preferable to move the blank 10 in the non-contact state of the blank 10.

Therefore, by using the second molding step S200 and the third molding step S300, it is possible not only to form a hollow shaft having a diameter smaller than the diameter of the mandrel 20, It is also possible to form a hollow shaft having a very small diameter which could not be manufactured.

On the other hand, since the inner peripheral surface of the rear end portion 50 of the formed blank 10 through the second forming step S200 and the third forming step S300 can have an irregular inner diameter, The rigidity and durability of the product may be reduced.

Therefore, in order to prevent the rigidity and the durability from being reduced when the finished hollow shaft is applied to a vehicle, the inner peripheral surface of the rear end portion 50 of the blank 10 having completed the third forming step S300 is drilled to form a constant inner diameter It is preferable to further perform the post-processing step.

Generally, the blank 10 formed through the third forming step S300 is managed on the basis of the shake tolerance (mm), and it is judged that the shake is severe when it is 0.5 mm or more in the semi-finished product state (monotone is completed).

If there is a shaking tolerance of 0.5 mm or more, a thickness variation occurs even after the post-processing, which causes uneven rotation of the solid shaft receiving the dynamic load. If the rotation of the solid shaft is uneven, vibration and noise are generated, and the rigidity and durability may be adversely affected.

Therefore, it is preferable that the blank 10 manufactured through the third forming step has a shaking tolerance of less than 0.5 mm, and the clamping pressure of the blank 10, the moving speed of the forging tool 30, The moving distance of the tool 30, the moving speed of the blank 10, and the like.

Since the mandrel 20 supports the inner side of the blank 10 in the general radial filling, only the outer peripheral surface of the front end portion 40 of the blank 10 is clamped using the chuck head (not shown) In the present invention, the mandrel 20 is pulled out before the rear end 50 of the blank 10 is formed, so that the turning radius of the blank 10 can be increased when the blank 10 is rotated.

Therefore, in order to stably maintain the rotation of the blank 10 during the first forming step S100 and the third forming step S300, the outer peripheral surface of the front end portion 40 of the blank 10 is clamped and the inner peripheral surface is supported It would be desirable to move it.

The blank 10 having completed the first forming step S100, the second forming step S200 and the third forming step S300 may be further subjected to a post-treatment step such as a separate outer shape, inner mold processing, high frequency heat treatment, have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

10: Blank 20: mandrel
30: Forging tool 40:
50: rear end P100: preparation step
S100: First forming step S200: Second forming step
S300: Third forming step

Claims (5)

Heating the blank formed with the hollow and inserting the mandrel inside the blank to place it between the plurality of forging tools;
A first shaping step of clamping and rotating the tip end of the blank, continuously pressing the outer circumferential surface of the blank with the plurality of forging tools to form the blank, and moving the blank in a direction perpendicular to the pressing direction of the forging tool;
A second forming step of moving the mandrel at a speed higher than the moving speed of the blank in a direction opposite to the moving direction of the blank before drawing the blank out of the blank before the blanking is completed; And
And a third step of press-molding the rear end of the blank after the second forming step with the forging tool to form a hollow having a diameter smaller than the outer diameter of the mandrel while moving the blank in a direction orthogonal to the pressing direction of the forging tool, Molding step,
Wherein the first shaping step and the third shaping step are carried out while supporting the inner peripheral surface while clamping the outer peripheral surface of the tip end portion of the blank.
The method according to claim 1,
Wherein during the first forming step, the mandrel is gradually moved in a direction opposite to the moving direction of the blank along with the movement of the blank.
The method according to claim 1,
And a post-machining step of drilling a rear end inner circumferential surface of the blank after the third shaping step has been completed.
The method according to claim 1,
Wherein the blanks in which the third shaping step is completed have a swing tolerance of less than 0.5 mm.
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KR1020140143256A 2014-10-22 2014-10-22 Manufacturing method of hollow shaft for vehicle having a small hollowness diameter KR101646363B1 (en)

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CN106734839B (en) * 2017-01-04 2018-10-23 上海理工大学 A method of preventing defect occur in variable-section variable wall thickness jackshaft rotary swaging process
CN109108198B (en) * 2018-08-22 2020-10-09 重庆建设工业(集团)有限责任公司 Rotary radial forging method of large-diameter thin-walled tube

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008520440A (en) 2004-11-20 2008-06-19 ゲー カー エヌ ドライブライン インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング Method for shrinking a tube along a stepped mandrel to produce a tube shaft with an undercut in one process

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Publication number Priority date Publication date Assignee Title
DE102009028720A1 (en) 2009-08-20 2011-02-24 Zf Friedrichshafen Ag Multi-speed transmission

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008520440A (en) 2004-11-20 2008-06-19 ゲー カー エヌ ドライブライン インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング Method for shrinking a tube along a stepped mandrel to produce a tube shaft with an undercut in one process

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