KR20180070307A - Magnesium rim for 2-piece road wheel, and method for manufacturing the same - Google Patents

Magnesium rim for 2-piece road wheel, and method for manufacturing the same Download PDF

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Publication number
KR20180070307A
KR20180070307A KR1020160172863A KR20160172863A KR20180070307A KR 20180070307 A KR20180070307 A KR 20180070307A KR 1020160172863 A KR1020160172863 A KR 1020160172863A KR 20160172863 A KR20160172863 A KR 20160172863A KR 20180070307 A KR20180070307 A KR 20180070307A
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KR
South Korea
Prior art keywords
magnesium
rim
magnesium plate
wheel
present
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Application number
KR1020160172863A
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Korean (ko)
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KR101899673B1 (en
Inventor
오윤석
박우진
박광수
Original Assignee
주식회사 포스코
재단법인 포항산업과학연구원
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Priority to KR1020160172863A priority Critical patent/KR101899673B1/en
Publication of KR20180070307A publication Critical patent/KR20180070307A/en
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    • 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
    • B21D22/14—Spinning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B21/00—Rims
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/15—Magnesium or alloys thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2310/00—Manufacturing methods
    • B60B2310/20—Shaping
    • B60B2310/231—Shaping by turning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2310/00—Manufacturing methods
    • B60B2310/30—Manufacturing methods joining
    • B60B2310/302—Manufacturing methods joining by welding
    • B60B2310/3025—Manufacturing methods joining by welding by thermal welding, e.g. friction, induction or ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2360/00—Materials; Physical forms thereof
    • B60B2360/10—Metallic materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

One aspect of the present invention relates to a method for manufacturing a magnesium rim for two-piece road wheel which is able to manufacture a high strength and lightweight wheel compared to a magnesium wheel manufactured by a conventional casting method, and is able to reduce production costs since a yield rate and productivity thereof are greater than those of the conventional method. The method of the present invention comprises: a step of preparing a magnesium plate material; a step of bending the magnesium plate material; a step of welding the magnesium plate material in a tube shape; and a step of spinning the magnesium plate material in a rim shape.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnesium rim for a two-piece road wheel, and a method of manufacturing the same. BACKGROUND ART [0002]

The present invention relates to a magnesium rim for a two-piece road wheel and a method of manufacturing the same.

In general, a road wheel for a vehicle may be classified into a steel wheel, an aluminum wheel, and a magnesium wheel depending on the material, and may be divided into a one-piece wheel, a two- piece wheel, a disc portion and a three-piece wheel divided into two rim portions.

The steel wheel is the most representative wheel used since the 1920s, and it is generally manufactured in the form of a two-piece consisting of a disk portion and a rim portion. Since it is inexpensive and has excellent rigidity, it has been applied to most commercial vehicles. However, Along with the decrease in weight and weight, the use ratio is decreasing, and the aluminum wheel replaces the place.

Aluminum has excellent castability and unlike steel wheels, aluminum wheels are mostly made in one piece by casting the whole wheel at once. They are applied to various mass-production vehicles because of their light weight effect and appearance compared to steel wheels. For example, Patent Document 1 discloses a vehicle wheel using an aluminum material and a manufacturing method thereof.

On the other hand, the light weight of the automobile is divided into the sprung mass which is the upper part around the suspension device and the light weight of the unsprung mass under the suspension device. Generally, when the weight of the sprung weight is reduced, Is 10 times more effective than lighter weight.

A variety of technologies have been applied to reduce the weight of the road wheel, which is a typical springs-less heavy component. Among them, the most efficient method is to use lightweight materials. Magnesium, which is the lowest weight among commercial non-ferrous metals, It is getting the spotlight as a material. When an aluminum material is used as in Patent Document 1, the lightening effect may be insufficient.

Therefore, there is a problem that mass production is difficult due to low strength compared with Al and deterioration of productivity due to defects in casting, although conventional aluminum wheel manufacturers are studying manufacturing of a one-piece magnesium wheel using a low pressure casting process.

Therefore, there is a demand for development of a magnesium wheel capable of mass production at a low cost using a magnesium material and securing high strength.

Korean Patent Publication No. 10-2010-0000829

One aspect of the present invention is to provide a magnesium rim for a two-piece road wheel and a method of manufacturing the same.

On the other hand, the object of the present invention is not limited to the above description. It will be understood by those of ordinary skill in the art that there is no difficulty in understanding the additional problems of the present invention.

According to an aspect of the present invention, there is provided a method of manufacturing a magnesium plate, comprising: preparing a magnesium plate having a thickness of 4 to 12 mm;

Bending the magnesium plate material;

Welding the bend-processed magnesium plate to a tube by friction stir welding under conditions of a tool rotating speed of 1000 to 1700 rpm and a welding speed of 80 to 220 mm / min; And

And spinning the magnesium plate welded in the form of a tube into a rim shape. The present invention also relates to a method of manufacturing a magnesium rim for a two-piece rodwheel.

Another aspect of the present invention relates to a magnesium rim for a two-piece rod wheel manufactured by the manufacturing method of the present invention.

In addition, the solution of the above-mentioned problems does not list all the features of the present invention. The various features of the present invention and the advantages and effects thereof can be understood in more detail with reference to the following specific embodiments.

According to the present invention, it is possible to provide a magnesium rim for a two-piece rod wheel capable of manufacturing a wheel having a higher strength and lighter weight than a magnesium wheel manufactured by an existing casting method and having a high yield and productivity, .

Fig. 1 is a photograph of rim surfaces of Comparative Examples 5 and 6. Fig.
2 is a photograph of a rim surface of Inventive Examples 3 and 4. Fig.
3 is a photograph of a welded portion of Comparative Example 1;

Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

The present inventors have found that the major defects and loss due to machining of the magnesium wheel produced by the low pressure casting are mostly generated in the rim portion and the load of the automobile rod wheel is concentrated on the edge of the rim portion And investigated in depth to solve this problem.

As a result, when a magnesium wheel is formed in a 2-piece form and the manufacturing conditions are appropriately controlled, there is almost no internal defect, and a rim portion can be manufactured using a magnesium plate having a low necessity of further processing, It was confirmed that it is easy to secure strength and stability as compared with the case where it is produced. Thus, the present invention has been accomplished.

Hereinafter, a method of manufacturing a magnesium rim for a two-piece rod wheel according to an embodiment of the present invention will be described in detail.

According to an aspect of the present invention, there is provided a method of manufacturing a magnesium rim for a two-piece road wheel, comprising: preparing a magnesium plate having a thickness of 4 to 12 mm;

Bending the magnesium plate material;

Welding the bend-processed magnesium plate to a tube by friction stir welding under conditions of a tool rotating speed of 1000 to 1700 rpm and a welding speed of 80 to 220 mm / min; And

And spinning the magnesium plate welded in the tube shape into a rim shape.

Magnesium sheet preparation step

Prepare a 4 to 12 mm thick magnesium plate.

If the thickness is less than 4 mm, the thickness of the final rim becomes thin and it becomes difficult to secure proper rigidity. When the thickness is more than 12 mm, bending for rim making is difficult and the effect of weight reduction is deteriorated. Therefore, the thickness of the magnesium plate is preferably 4 to 12 mm, and more preferably 4 to 10 mm.

At this time, the magnesium plate may be an AZ31 magnesium plate.

For example, it may be an AZ31 magnesium plate containing, by weight%, 2.5 to 3.5% of Al, 0.7 to 1.3% of Zn, and the balance of Mg and unavoidable impurities.

As a non-limiting example, a magnesium plate having a thickness of 6 mm manufactured by a twin roll thin plate casting process may be prepared by annealing or a magnesium plate having a thickness of 10 mm may be rolled to a thickness of 6 mm.

Bending  step

The magnesium plate material is bended.

At this time, the bending process can be performed at 300 DEG C or less. When bending is performed at a temperature higher than 300 DEG C, bending is easy but bending is preferably performed at a temperature as low as possible because of problems such as increase in manufacturing cost and surface oxidation.

More preferably, a plate material having an elongation of 2% or more can be used to bend at room temperature.

Friction stir welding  step

The bend-processed magnesium plate is welded in a tube shape by friction stir welding under conditions of a tool rotating speed of 1000 to 1700 rpm and a welding speed of 80 to 220 mm / min.

If the rotational speed of the tool is less than 1000 rpm or the welding speed is less than 80 mm / min, there is a shortage of heat input, the possibility of defects due to insufficient fluidity is high, internal defects may increase, and welding may be difficult to proceed normally.

On the other hand, when the rotational speed of the tool exceeds 1700 rpm or the welding speed exceeds 220 mm / min, the physical properties such as strength and elongation rate may decrease due to the temperature rise of the welded portion.

Spinning  Processing step

The magnesium plate welded in the tube shape is spin-processed into a rim shape.

At this time, the spinning process can be performed at a molding speed of 2 mm / cycle or less by heating the magnesium plate welded in the tube shape to 150 to 370 ° C.

If the heating temperature is less than 150 ° C or the molding speed is more than 2 mm / cycle, problems such as cracking and breakage may occur during the spinning process. If the heating temperature is higher than 370 ° C, .

Another aspect of the present invention is a magnesium rim for a two-piece road wheel manufactured by the manufacturing method described above. By combining the magnesium rim of the present invention with the disc portion, it is possible to manufacture a wheel having a higher strength and lighter weight than a 1-piece magnesium wheel manufactured by a conventional casting method, and the production cost can be reduced because of high yield and productivity.

At this time, the tensile strength of the magnesium rim may be 180 MPa or more and the elongation may be 6.5% or more. More preferably, the tensile strength is 185 MPa or more and the elongation can be 7.0% or more.

Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the invention in more detail and not to limit the scope of the invention. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred therefrom.

( Example )

AZ31 type magnesium plate of 6 mm in thickness (Al: 3.0%, Zn: 1.0% of residual Mg and unavoidable impurities in weight%) manufactured by the twin roll type thin plate casting process was bend at room temperature, Followed by friction stir welding and welding in the form of a tube.

The mechanical properties of the tube-shaped magnesium plate and the occurrence of weld defect were measured and are shown in Table 2 below.

The tube-shaped magnesium plate having good weld quality and mechanical properties was heated to the heating temperature shown in Table 1 below and spinning was performed at the molding speed shown in Table 1 below to produce a rim. The occurrence of surface defects in the rim was observed and is shown in Table 2 below.

division Tool rotation speed
(rpm) Welding speed
(mm / min) Heating temperature
(° C) Molding speed
(mm / cycle) Comparative Example 1 900 100 - - Comparative Example 2 900 200 - - Inventory 1 1200 100 220 One Inventory 2 1200 200 350 One Inventory 3 1500 100 350 One Honorable 4 1500 200 220 One Comparative Example 3 1800 100 - - Comparative Example 4 1800 200 - - Comparative Example 5 1500 100 100 3 Comparative Example 6 1500 100 220 3

division Yield strength
(MPa) The tensile strength
(MPa) Elongation
(%) Weld defect
Occurrence Surface defect
Occurrence AZ31 plate 95.2 183.0 6.7 - - Comparative Example 1 84.1 180.9 6.6 O - Comparative Example 2 83.7 183.3 6.6 O - Inventory 1 83.0 193.8 7.5 X X Inventory 2 82.6 188.0 7.0 X X Inventory 3 85.8 222.2 12.4 X X Honorable 4 87.8 219.3 12.2 X X Comparative Example 3 78.1 164.2 5.3 X - Comparative Example 4 80.3 158.2 4.9 X - Comparative Example 5 85.8 222.2 12.4 X O Comparative Example 6 85.8 222.2 12.4 X O

Inventive Examples 1 to 4 according to the present invention were able to secure a tensile strength of 180 MPa or more and an elongation of 6.5% or more, and it was confirmed that weld defects and surface defects did not occur.

In the case of Comparative Examples 1 and 2, it was possible to secure the mechanical properties, but the welding rotation speed was less than 1000 rpm during friction stir welding, resulting in welding defects due to lack of fluidity. FIG. 3 is a photograph of a welded portion of Comparative Example 1, which shows that a weld defect has occurred.

In the case of Comparative Examples 3 and 4, in the case of friction stir welding, the mechanical properties were deteriorated due to the increase in the temperature of the welded portion due to the tool rotation speed exceeding 1700 rpm.

In the case of Comparative Examples 5 and 6, when the heating temperature was less than 150 占 폚 during the spinning process or the forming speed exceeded 2 mm / cycle, the rim surface cracked or fractured as shown in Fig. On the other hand, FIG. 2, which is a photograph of the rim surface of Inventive Examples 3 and 4, shows that surface defects do not occur.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (6)

Preparing a magnesium plate having a thickness of 4 to 12 mm;
Bending the magnesium plate material;
Welding the bend-processed magnesium plate to a tube by friction stir welding under conditions of a tool rotating speed of 1000 to 1700 rpm and a welding speed of 80 to 220 mm / min; And
And spinning the magnesium plate welded in the tube shape into a rim shape.
The method according to claim 1,
Wherein the magnesium plate is an AZ31 magnesium plate. 2. The magnesium rim for a two-piece rod wheel according to claim 1, wherein the magnesium plate is an AZ31 magnesium plate.
The method according to claim 1,
Wherein the bending process is performed at 300 캜 or less.
The method according to claim 1,
Wherein the spinning is performed at a molding speed of 2 mm / cycle or less by heating the magnesium plate welded in the tube shape to 150 to 370 占 폚.
A magnesium rim for a two-piece road wheel produced by the method of any one of claims 1 to 4.
6. The method of claim 5,
Wherein the magnesium rim has a tensile strength of 180 MPa or more and an elongation of 6.5% or more.
KR1020160172863A 2016-12-16 2016-12-16 Magnesium rim for 2-piece road wheel, and method for manufacturing the same KR101899673B1 (en)

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KR101899673B1 KR101899673B1 (en) 2018-09-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111014936A (en) * 2019-11-16 2020-04-17 李冬林 Automobile wheel friction welding device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR980008955A (en) * 1996-07-10 1998-04-30 박병재 Manufacturing method of steering wheel
KR20010066997A (en) * 2000-11-09 2001-07-12 백정훈 Method for manufacturing of vehicle alloy wheel
KR20040096084A (en) * 2003-05-07 2004-11-16 현대자동차주식회사 Method for forming Al-Mg-Si aluminum alloy sheet
JP2007061877A (en) * 2005-09-01 2007-03-15 Sumitomo Light Metal Ind Ltd Method of manufacturing cylindrical article
KR20070053380A (en) * 2005-11-21 2007-05-25 현대자동차주식회사 Structure and method for joining of aluminum wheel
KR20100000829A (en) 2008-06-25 2010-01-06 현대자동차주식회사 Wheel for a vehicle and method for manufacturing the same
JP2010095011A (en) * 2008-10-14 2010-04-30 Topy Ind Ltd Disk for wheel, vehicular wheel, and method of manufacturing the disk for wheel and the vehicular wheel
JP4734578B2 (en) * 2005-05-30 2011-07-27 国立大学法人大阪大学 Magnesium alloy sheet processing method and magnesium alloy sheet
KR20160064296A (en) * 2014-11-27 2016-06-08 한국기계연구원 The method for manufacturing of heat-treatable alloy plate and heat-treatable alloy plate
KR101671779B1 (en) * 2015-12-07 2016-11-02 현대성우신소재 주식회사 Manufacturing Method of 2-Piece Joining Type Road Wheel and Manufacturing System for the Same

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR980008955A (en) * 1996-07-10 1998-04-30 박병재 Manufacturing method of steering wheel
KR20010066997A (en) * 2000-11-09 2001-07-12 백정훈 Method for manufacturing of vehicle alloy wheel
KR20040096084A (en) * 2003-05-07 2004-11-16 현대자동차주식회사 Method for forming Al-Mg-Si aluminum alloy sheet
JP4734578B2 (en) * 2005-05-30 2011-07-27 国立大学法人大阪大学 Magnesium alloy sheet processing method and magnesium alloy sheet
JP2007061877A (en) * 2005-09-01 2007-03-15 Sumitomo Light Metal Ind Ltd Method of manufacturing cylindrical article
KR20070053380A (en) * 2005-11-21 2007-05-25 현대자동차주식회사 Structure and method for joining of aluminum wheel
KR20100000829A (en) 2008-06-25 2010-01-06 현대자동차주식회사 Wheel for a vehicle and method for manufacturing the same
JP2010095011A (en) * 2008-10-14 2010-04-30 Topy Ind Ltd Disk for wheel, vehicular wheel, and method of manufacturing the disk for wheel and the vehicular wheel
KR20160064296A (en) * 2014-11-27 2016-06-08 한국기계연구원 The method for manufacturing of heat-treatable alloy plate and heat-treatable alloy plate
KR101671779B1 (en) * 2015-12-07 2016-11-02 현대성우신소재 주식회사 Manufacturing Method of 2-Piece Joining Type Road Wheel and Manufacturing System for the Same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111014936A (en) * 2019-11-16 2020-04-17 李冬林 Automobile wheel friction welding device

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