JPS62250149A - Aluminum alloy for bicycle - Google Patents

Aluminum alloy for bicycle

Info

Publication number
JPS62250149A
JPS62250149A JP9562786A JP9562786A JPS62250149A JP S62250149 A JPS62250149 A JP S62250149A JP 9562786 A JP9562786 A JP 9562786A JP 9562786 A JP9562786 A JP 9562786A JP S62250149 A JPS62250149 A JP S62250149A
Authority
JP
Japan
Prior art keywords
aluminum alloy
grain size
strength
stress corrosion
corrosion cracking
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP9562786A
Other languages
Japanese (ja)
Inventor
Isamu Tanaka
勇 田中
Kenji Hayashi
憲二 林
Masakazu Hirano
正和 平野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP9562786A priority Critical patent/JPS62250149A/en
Publication of JPS62250149A publication Critical patent/JPS62250149A/en
Pending legal-status Critical Current

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  • Nonmetallic Welding Materials (AREA)

Abstract

PURPOSE:To obtain an Al alloy for bicycle having fine grain size, excellent in stress corrosion cracking resistance in a weld zone, and having high fatigue strength, by specifying a composition consisting of Zn, Mg, Ti, B, Cu, Mn, Ag, Ni, Si, Cr, Zr, and Al. CONSTITUTION:The Al alloy for bicycle has a composition consisting of, by weight, 3.0-8.0% Zn, 0.3-3.0% Mg, 0.005-0.20% Ti, 0.005-0.05% B, 0.03-0.5% Cu, 0.05-0.40% Mn, one kind among 0.03-0.5% Ag, 0.03-0.5% Ni, and 0.2-0.7% Si, further both of 0.05-0.40% Cr, and 0.05-0.25% Zr, and the balance Al with inevitable impurities, in which grain size in a cast structure is regulated to <=1,500mum. This alloy has fine grain size and also has superior stress corrosion cracking resistance in a weld zone and high fatigue strength of welding material and, moreover, it is excellent in vibration strength.

Description

【発明の詳細な説明】 r 産’B l−ノミf口11 /、> ’L!) 1
本発明は自転車用アルミニウム合金に関し、さらに詳し
くは、耐応力腐蝕割れ性が良好で、かつ、強度の優れた
自転車用アルミニウム合金に関する。
[Detailed description of the invention] r production'B l-flea f mouth 11 /, >'L! ) 1
The present invention relates to an aluminum alloy for bicycles, and more particularly to an aluminum alloy for bicycles that has good stress corrosion cracking resistance and excellent strength.

[従来技術] 近年における自転車は軽量化が要求されてきており、そ
のためアルミニウム合金製のフレームが製作されている
[Prior Art] Bicycles in recent years have been required to be lightweight, and therefore frames made of aluminum alloy have been manufactured.

このフレームには高荷重が負荷されるので、高強度であ
って、かつ、溶接構造であるため溶接性の良いアルミニ
ウム合金が要求されている。そのため、アルミニウム合
金を使用ずろ場合には、Al−7,n−Mg系合金が使
用されるが、この種の高力アルミニウム合金は、高強度
になるに従って応力腐蝕割れが発生し易くなるので、上
記Al−Zn−Mg系合金をフレームとして使用する際
に、t、?酷な使用条件では応力腐蝕割れが生じるとい
う問題がある。
Since this frame is subjected to a high load, it is required to be made of an aluminum alloy that has high strength and has good weldability because it has a welded structure. Therefore, if an aluminum alloy is not used, an Al-7, n-Mg alloy is used, but as this type of high-strength aluminum alloy becomes higher in strength, stress corrosion cracking becomes more likely to occur. When using the above Al-Zn-Mg alloy as a frame, t,? There is a problem that stress corrosion cracking occurs under severe usage conditions.

また、フレームには耐久性か要求されるので疲労強度の
高いアルミニウム合金が必要であり、Al−Zn−Mg
系合金は比較的高い疲労強度を有するが、溶接を行なっ
た場合に溶接部の疲労強度が低くなるという問題がある
In addition, since durability is required for the frame, an aluminum alloy with high fatigue strength is required, and Al-Zn-Mg
Although these alloys have relatively high fatigue strength, there is a problem in that when welding is performed, the fatigue strength of the welded part becomes low.

[発明が解決しようとずろ問題点] 本発明は上記に説明したように、従来における自転車用
アルミニウム合金の種々の問題点に鑑みなされた乙ので
あり、本発明者が鋭意研究を行ない、検討を重ねた結果
、結晶粒径が微細であり、溶接部の耐応力腐蝕割れ性が
良好であり、さらに、疲労強度の高い自転車用アルミニ
ウム合金を開発 。
[Problems to be Solved by the Invention] As explained above, the present invention was made in view of the various problems of conventional aluminum alloys for bicycles, and the present inventor has conducted extensive research and studies. As a result of repeated efforts, we developed an aluminum alloy for bicycles that has fine grain size, good resistance to stress corrosion cracking in welded parts, and high fatigue strength.

したのである。That's what I did.

[問題点を解決するための手段] 本発明に係る自転車用アルミニウム合金の特徴とすると
ころは、 Zn 3.0〜8.0wt%、Mg 0.3〜3.ht
%、’r i 0.005〜0.20wt%、B 0.
005〜0.05wt%、Cu 0.03〜0.5wt
%、Mn 0.05〜0.40wt%を含有し、および
、 Ag 0.03〜0.5wt%、N i 0.03〜0
.5wt%、S i Q、2〜0.7wt% のうちから選んだ1種 を含イfし、さらに、 Cr 0.05〜0.40wL%、Z r 0.05〜
0.25wL%の2種 を含有し、残部A1および不可避不純物からなり、かつ
、鋳造組織における結晶粒径を1500μm以下とした
ことことにある。
[Means for Solving the Problems] The aluminum alloy for bicycles according to the present invention is characterized by: Zn: 3.0 to 8.0 wt%, Mg: 0.3 to 3.0 wt%. ht
%, 'r i 0.005-0.20wt%, B 0.
005-0.05wt%, Cu 0.03-0.5wt
%, Mn 0.05-0.40 wt%, and Ag 0.03-0.5 wt%, Ni 0.03-0
.. 5 wt%, S i Q, 2 to 0.7 wt%, and further contains Cr 0.05 to 0.40 wL%, Z r 0.05 to
It contains 0.25wL% of two types, the remainder consists of A1 and unavoidable impurities, and the crystal grain size in the cast structure is 1500 μm or less.

本発明に係る自転車用アルミニウム合金について、以下
詳細に説明する。
The aluminum alloy for bicycles according to the present invention will be explained in detail below.

先ず、本発明に係る自転車用アルミニウム合金の含有成
分および成分割合について説明する。
First, the components and component ratios of the aluminum alloy for bicycles according to the present invention will be explained.

Znは強度を向上させるために最も重要な元素であり、
含有量が3.Ovt%未満では充分な強度を得ることが
できず、また、8.0w1%を越えて含有されると応力
腐蝕割れが発生し易くなる。よって、Zn含有量は3.
0〜8.0wt%とする。
Zn is the most important element for improving strength,
The content is 3. If the content is less than Ovt%, sufficient strength cannot be obtained, and if the content exceeds 8.0w1%, stress corrosion cracking is likely to occur. Therefore, the Zn content is 3.
0 to 8.0 wt%.

MgはZnと同様に強度向上に対して重要な元素であり
、含有量が0.3wt%未満では充分な強度が得られず
、また、3.0wt%を越えて含有されろと応力腐蝕割
れが発生し易くなる。
Like Zn, Mg is an important element for improving strength; if the content is less than 0.3 wt%, sufficient strength cannot be obtained, and if the content exceeds 3.0 wt%, stress corrosion cracking may occur. is more likely to occur.

TiおよびBは鋳塊の組織微細化のために重要な元素で
あり、Ti含有量が0.005wt%未満およびB含有
量が0.005wt%未満では結晶粒微細化に効果が少
なく、また、Ti 0.20wt%、B 0.05wL
%を夫々越えて含有されると巨大化合物が生成する可能
性がある。よって、Ti含有量は0.005〜0.2(
m%、B Q、QQ5〜0.05wt%とする。
Ti and B are important elements for refining the structure of an ingot, and if the Ti content is less than 0.005 wt% and the B content is less than 0.005 wt%, there is little effect on grain refining. Ti 0.20wt%, B 0.05wL
If the content exceeds 5% of each, there is a possibility that a giant compound will be formed. Therefore, the Ti content is 0.005 to 0.2 (
m%, BQ, QQ5 to 0.05wt%.

Cuは耐応力腐蝕割れ性を著しく向上させる元素であり
、含有量が0.03wt%未満ではこの効果は少な(、
また、0.5wt%を越えて含有されると溶接性が劣化
する。よって、Cu含有量は0.03〜0.5wt%と
する。
Cu is an element that significantly improves stress corrosion cracking resistance, and if the content is less than 0.03 wt%, this effect is small (,
Moreover, if the content exceeds 0.5 wt%, weldability deteriorates. Therefore, the Cu content is set to 0.03 to 0.5 wt%.

Mnは組織改善のために必要な元素であり、含有量が0
.05wt%未満ではこの効果は少なく、また、0.0
40w1%を越えて含有されると巨大化合物が生成する
ようになる。よって、Mn含有量は0.05〜0.4h
t%とする。
Mn is an element necessary for improving the structure, and the content is 0.
.. If it is less than 0.05 wt%, this effect is small, and if it is less than 0.0
If the content exceeds 40w1%, giant compounds will be generated. Therefore, the Mn content is 0.05-0.4h
It is assumed to be t%.

八g1Nts Ssはこのうちから選んだ1種を含有さ
せること(こより耐応力腐蝕割れ性を向上させることが
でき、含有ah<Ag 0.03wt%未満、N1O−
03vt%−r週−Si 0−2wt%央溝では耐応力
腐蝕割れ性を向上させる効果は少なく、また、Ag09
5wt%、Ni 0.5wL%、Si0.7wt%を夫
々越えて含有されると溶接性が劣化する。よって、Ag
0.03〜0.5wt%、N i 0.03〜0.5w
t%、Si0.3〜0.7wt%とする。
8g1Nts Ss should contain one selected from these (this can improve stress corrosion cracking resistance, content ah<Ag less than 0.03wt%, N1O-
03vt%-r week-Si 0-2wt% center groove has little effect on improving stress corrosion cracking resistance, and Ag09
If the content exceeds 5 wt%, Ni 0.5 wL%, and Si 0.7 wt%, weldability deteriorates. Therefore, Ag
0.03-0.5wt%, Ni 0.03-0.5w
t% and Si0.3 to 0.7wt%.

Cr5Zrは組織を改善するために必要な元素で、均質
化、熱間加工の組合せによって結晶粒を微細にするもの
であり、含有量がCr Q、05wt5未満、Zr 0
.05wt%未満ではこの効果は少なく、また、Cr 
0.40wt%、Zr 0.25wt%を夫々越えて含
有されると巨大化合物が生成する可能性がある。よって
、C「含有量は0.05〜0.4hL%、Zr含¥Tf
fiは0.05〜0.25wt%とする。
Cr5Zr is an element necessary to improve the structure, and is used to make crystal grains fine by a combination of homogenization and hot working.
.. This effect is small at less than 0.05 wt%, and Cr
If the content exceeds 0.40 wt% and 0.25 wt% of Zr, a giant compound may be formed. Therefore, the C content is 0.05 to 0.4 hL%, Zr-containing \Tf
fi is 0.05 to 0.25 wt%.

また、鋳造組織における結晶粒径が1500μmを越え
る大きさでは製品の粒径が肥大化して溶接性を劣化させ
る。よって、鋳造組織における結晶粒径は1500μm
以下とする。
Furthermore, if the crystal grain size in the cast structure exceeds 1500 μm, the grain size of the product becomes enlarged and weldability deteriorates. Therefore, the crystal grain size in the cast structure is 1500 μm.
The following shall apply.

[実 施 例] 次に、本発明に係る自転車用アルミニウム合金について
実施例を説明する。
[Example] Next, an example of the aluminum alloy for bicycles according to the present invention will be described.

実施例 第1表に示す食台成分、成分割合のAl−Zn−Mg系
合金を通常の方法により溶製し鋳造した鋳塊を、400
〜450℃の温度で押出し、直径35mm肉厚4mmの
管および直径15mmの棒を製作した。
EXAMPLE An ingot produced by melting and casting an Al-Zn-Mg alloy having the table components and component ratios shown in Table 1 in a conventional manner was
Extrusion was carried out at a temperature of ~450°C to produce tubes with a diameter of 35 mm and a wall thickness of 4 mm and rods with a diameter of 15 mm.

これらの押出し管を、冷間抽伸、およびテーパー加工を
行なって、ホークステムおよびホーク足等のフレーム部
品を製作した。
These extruded tubes were subjected to cold drawing and taper processing to produce frame parts such as a hawk stem and hawk legs.

また、これらの押出し棒を、冷間鍛造によりホーク爪を
製作した。
Furthermore, hawk claws were produced from these extruded rods by cold forging.

このようにして製作されたホークスヂム、ホーク足、ホ
ーク爪を、450℃の温度で30分間の溶体化処理を行
なった後、水冷し、120℃の温度において24時間の
時効を行なった。
The thus produced hawk limbs, hawk feet, and hawk claws were subjected to solution treatment at a temperature of 450°C for 30 minutes, then cooled with water, and aged at a temperature of 120°C for 24 hours.

これらの部品を溶接により前ホークを製作した。The front hawk was made by welding these parts together.

第2表に前ホークの性能を示しである。Table 2 shows the performance of the previous Hawk.

・結晶粒径は管材の長手方向に平行な断面を金属顕微鏡
により観察した。
・Crystal grain size was determined by observing a cross section parallel to the longitudinal direction of the tube material using a metallurgical microscope.

・耐応力腐蝕割れ性はC−Ring試験片を用いて長さ
方向に応力を負荷し、100℃の3g/lNaCl  
30f’!/l K、Cr:+Ot  3 (3g/I
 Crys混合水溶液に浸漬した。記号○tはt分浸漬
ににって乙割れか発生しないことを示す。
・Stress corrosion cracking resistance was measured by applying stress in the longitudinal direction using a C-Ring test piece and applying 3 g/l NaCl at 100°C.
30f'! /l K, Cr: +Ot 3 (3g/I
It was immersed in a Crys mixed aqueous solution. The symbol ○t indicates that no cracking occurs after immersion for t minutes.

・溶接部の耐応力腐蝕割れ性は第1図に示すように、ビ
ン5を有ずろ支持金具3に溶接ビード2がある板材lを
支持する3点指示法で、15Kg/mm2の応力を加え
た試験を100°Cの、3g/lNaCl  36g/
lCrO3aog/1K2cr30□の混合水溶液に浸
漬して割れを観察した。試料の厚さは2mmとし、溶加
材は5356を使用し、電流は120Aとした。4は割
れを示す。
・As shown in Figure 1, the stress corrosion cracking resistance of the welded part is determined by applying a stress of 15 kg/mm2 using the 3-point pointing method in which a plate 1 with a weld bead 2 is supported on a pin 5 with a dowel support 3. The test was carried out at 100°C with 3g/l NaCl 36g/l
It was immersed in a mixed aqueous solution of lCrO3aog/1K2cr30□ and cracks were observed. The thickness of the sample was 2 mm, 5356 was used as the filler metal, and the current was 120 A. 4 indicates cracking.

・溶接材の疲労強度は通常のシェンク式平面曲げ疲労試
験で107回の疲労強度を求めた。試験片の1!1さは
2mmとし、溶接部の余盛りは除去し、表面は#!00
耐水エメリーペーパーにより仕上げを行なった。
・The fatigue strength of the welded material was determined using a normal Schenk plane bending fatigue test 107 times. The 1:1 height of the test piece was 2 mm, the excess of the weld was removed, and the surface was #! 00
Finishing was done with water-resistant emery paper.

・振動強度は第2図に示すように、フロントフォーク1
1と鉄製フレーム体15とを組合せた自転車車体を固定
台17と振動台16とに取り付け、第3表に示す試験条
件により垂直な上下振動を与えた時の、アルミニウム合
金製フロントフォークの各部に破損、著しい変形、また
は、ゆがみの発生を目視により調査した。12.13.
14は荷重点、18は振幅、19は中点である。
・Vibration strength is as shown in Figure 2, front fork 1
1 and a steel frame body 15 was attached to a fixed table 17 and a vibration table 16, and vertical vibration was applied to each part of the aluminum alloy front fork under the test conditions shown in Table 3. The occurrence of damage, significant deformation, or distortion was visually inspected. 12.13.
14 is a load point, 18 is an amplitude, and 19 is a midpoint.

第2表に振動強度を示すが、OはlO万万態以上振動回
数でも破損、著しい変形または、ゆがみの発生がないこ
とを表わす。なお、フレームには鉄製ダイヤモンド形を
採用した。
Table 2 shows the vibration strength, and O indicates that no damage, significant deformation, or distortion occurs even when the number of vibrations is 10 or more. The frame is made of iron and has a diamond shape.

[発明の効果] 以上説明したように、本発明に係る自転車用アルミニウ
ム合金は上記の構成であるから、結晶粒径は微細であり
、溶接部の耐応力腐蝕割れ性に優れ、溶接材の疲労強度
が高く、さらに、振動強度に潰れているという効果を有
するものである。
[Effects of the Invention] As explained above, since the aluminum alloy for bicycles according to the present invention has the above-mentioned structure, the crystal grain size is fine, the stress corrosion cracking resistance of the welded part is excellent, and the fatigue of the welded material is reduced. It has the effect of being high in strength and being crushed by vibration strength.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は溶接部の応力腐蝕割れ性の試験機の断面図、第
2図は振動強度の試験方法の説明図である。 ■・・板材、2・・溶接ビード、3・・支持金具、4・
・割れ、5・・ピン、IIフロントフォーク(供試材)
、12.13.14・・荷重点、15・・鉄製フレーム
、16・・振動台、I7・・固定台、18・・振幅、I
9・・中点。 1m 第2閲
FIG. 1 is a sectional view of a tester for stress corrosion cracking of welded parts, and FIG. 2 is an explanatory diagram of a vibration strength test method. ■... Plate material, 2... Welding bead, 3... Support metal fittings, 4...
・Crack, 5...Pin, II front fork (sample material)
, 12.13.14... Load point, 15... Steel frame, 16... Vibration table, I7... Fixed table, 18... Amplitude, I
9...Middle point. 1m 2nd inspection

Claims (1)

【特許請求の範囲】 Zn3.0〜8.0wt%、Mg0.3〜3.0wt%
、Ti0.005〜0.20wt%、B0.005〜0
.05wt%、Cu0.03〜0.5wt%、Mn0.
05〜0.40wt%を含有し、および、 Ag0.03〜0.5wt%、Ni0.03〜0.5w
t%、Si0.2〜0.7wt% のうちから選んだ1種 を含有し、さらに、 Cr0.05〜0.40wt%、Zr0.05〜0.2
5wt%の2種 を含有し、残部Alおよび不可避不純物からなり、かつ
、鋳造組織における結晶粒径を1500μm以下とした
ことを特徴とする自転車用アルミニウム合金。
[Claims] Zn3.0-8.0wt%, Mg0.3-3.0wt%
, Ti0.005~0.20wt%, B0.005~0
.. 05wt%, Cu0.03-0.5wt%, Mn0.
0.05 to 0.40 wt%, and 0.03 to 0.5 wt% of Ag, 0.03 to 0.5 w of Ni.
t%, Si0.2-0.7wt%, and further contains Cr0.05-0.40wt%, Zr0.05-0.2
1. An aluminum alloy for bicycles, characterized in that it contains 5 wt% of two kinds of aluminum, the remainder being Al and unavoidable impurities, and having a crystal grain size of 1500 μm or less in a cast structure.
JP9562786A 1986-04-24 1986-04-24 Aluminum alloy for bicycle Pending JPS62250149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9562786A JPS62250149A (en) 1986-04-24 1986-04-24 Aluminum alloy for bicycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9562786A JPS62250149A (en) 1986-04-24 1986-04-24 Aluminum alloy for bicycle

Publications (1)

Publication Number Publication Date
JPS62250149A true JPS62250149A (en) 1987-10-31

Family

ID=14142759

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9562786A Pending JPS62250149A (en) 1986-04-24 1986-04-24 Aluminum alloy for bicycle

Country Status (1)

Country Link
JP (1) JPS62250149A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03122247A (en) * 1989-10-06 1991-05-24 Furukawa Alum Co Ltd High strength aluminum alloy for welding excellent in stress corrosion cracking resistance
WO2005106057A3 (en) * 2004-04-22 2006-01-26 Alcoa Inc Heat treatable al-zn-mg alloy for aerospace and automotive castings
WO2005106058A3 (en) * 2004-04-22 2006-09-14 Alcoa Inc Heat treatable al-zn-mg-cu alloy for aerospace and automotive castings
WO2006127811A3 (en) * 2005-05-25 2007-03-01 Howmet Corp An al-zn-mg-ag high-strength alloy for aerospace and automotive castings
CN102319884A (en) * 2011-10-10 2012-01-18 东北轻合金有限责任公司 Method for preparing solderable flat aluminum alloy ingots
US8157932B2 (en) 2005-05-25 2012-04-17 Alcoa Inc. Al-Zn-Mg-Cu-Sc high strength alloy for aerospace and automotive castings
US9353430B2 (en) 2005-10-28 2016-05-31 Shipston Aluminum Technologies (Michigan), Inc. Lightweight, crash-sensitive automotive component
CN109355538A (en) * 2018-12-05 2019-02-19 辽宁忠旺集团有限公司 A kind of high-strength 7 line aluminium alloy tubing production technology
EP3239313A3 (en) * 2016-04-04 2019-08-14 Korea Automotive Technology Institute Wrought aluminum alloy

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03122247A (en) * 1989-10-06 1991-05-24 Furukawa Alum Co Ltd High strength aluminum alloy for welding excellent in stress corrosion cracking resistance
WO2005106057A3 (en) * 2004-04-22 2006-01-26 Alcoa Inc Heat treatable al-zn-mg alloy for aerospace and automotive castings
WO2005106058A3 (en) * 2004-04-22 2006-09-14 Alcoa Inc Heat treatable al-zn-mg-cu alloy for aerospace and automotive castings
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