WO2004040153A1 - High strength propeller shaft with excellent durability, and method of manufacturing the propeller shaft - Google Patents

High strength propeller shaft with excellent durability, and method of manufacturing the propeller shaft Download PDF

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Publication number
WO2004040153A1
WO2004040153A1 PCT/JP2003/013876 JP0313876W WO2004040153A1 WO 2004040153 A1 WO2004040153 A1 WO 2004040153A1 JP 0313876 W JP0313876 W JP 0313876W WO 2004040153 A1 WO2004040153 A1 WO 2004040153A1
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strength
propeller shaft
power transmission
excellent durability
plastic deformation
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PCT/JP2003/013876
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French (fr)
Japanese (ja)
Inventor
Akihiro Miyasaka
Tomonori Tominaga
Itsurou Hiroshige
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Nippon Steel Corporation
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Priority to AU2003280612A priority Critical patent/AU2003280612A1/en
Publication of WO2004040153A1 publication Critical patent/WO2004040153A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/32—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels
    • F16F15/34—Fastening arrangements therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles

Definitions

  • the present invention is a propeller shaft for transmitting the propulsive force of an engine to each wheel in a car, a vehicle, such as a passenger car, a truck, and a tractor.
  • the present invention also relates to a high-strength propeller having excellent durability, especially torsional fatigue resistance, and a method for producing the same.
  • a balance piece 2 is attached to the periphery of the propeller shaft 1 by spot welding or projection welding to adjust the circumferential weight balance (for example, Vehicle Technology Handbook, 4th Volume, Production 'Quality' Maintenance Edition (published first edition on September 1, 1991, Japan Society of Automotive Engineers of Japan), p. 233
  • the strength of the steel pipe is reduced by heating, and a large heating facility is required for heating, so that the product cost must be increased.
  • a balance piece is bonded to the peripheral surface of the propeller shaft with an adhesive to eliminate a welded portion that becomes a starting point of fatigue cracks.
  • the high-strength especially tensile strength with 7 0 0 N Zmm 2 or more steel, but it is required to reduce the overall weight
  • the torsional fatigue resistance of the welded part of the paran speed governs the torsional fatigue resistance of the entire propeller shaft.
  • the present invention is to meet the above requirements, provide a tensile strength 7 0 0 N Zmm 2 high-strength propeller shafts preparative and a manufacturing method thereof with improved resistance to torsional fatigue characteristics of the welded portion of the para Nsupisu welded steel pipe on more than The purpose is to do.
  • the inventor of the present invention has found that by reducing the residual stress generated by rapid heating and quenching, by making the distribution uniform, and by eliminating the stress concentration portion due to the geometrical shape, the fatigue of the balance piece from the vicinity of the welded portion can be reduced.
  • the idea was that crack initiation could be significantly delayed, resulting in improved torsional fatigue resistance.
  • the present inventor has found that, for example, if a plastic deformation region is formed on the back surface of a welded portion of a balance piece by peening using ultrasonic vibration, the torsional fatigue resistance of the welded portion can be improved. I found it.
  • the present invention has been made based on the above findings, and the gist thereof is as follows. (1) In a high-strength propeller shaft in which a power transmission section is joined to both ends of a steel pipe having a tensile strength of 700 NZinm 2 or more and a balance piece is welded to the peripheral surface of the steel pipe, welding of the balance piece is performed.
  • a highly durable high-strength propeller shaft characterized by forming a plastic deformation region on the back of the part.
  • Figure 1 is a diagram showing a propeller shaft welded with a balance piece.
  • the present invention provides a high-strength propeller shafts bets tensile strength is by welding a balun Spies on the peripheral surface of 7 0 0 N Zmm 2 or more steel pipe to form a plastically deformed area on the back of the weld. Parts of Paran Spies It is characterized by
  • the tensile strength was targeted to improve resistance to torsional fatigue characteristics in the case of using the 7 0 0 N Zmm 2 or more steel.
  • any method that can apply deformation energy intensively for a short time is sufficient.
  • it can be formed by sheet peening process. Wear.
  • the frequency is 19 to 60 kHz
  • the amplitude is 20 to 50 / zm
  • the output is 0.2 to 3 kW.
  • the degree of plastic deformation in this plastic deformation region needs to be 1% or more, and the larger, the better.
  • the thickness is required to be 10% or more of the thickness of the pulse piece, and more preferably 15% or more.
  • the residual stress in the welded portion and / or the vicinity of the welded portion of the balance piece is significantly reduced, the distribution thereof is made uniform, and stress concentration due to the geometrical shape is caused. Parts can be eliminated. As a result, the generation of fatigue cracks near the welded portion of the balance piece can be significantly delayed.
  • the plastic deformation region may be formed on the back surface corresponding to the welded portion of the balance piece, or may be formed so as to surround the back surface.
  • the plastic deformation region may be formed along the boundary.
  • torsional stress also acts on the joint between the steel pipe end and the power transmission section.
  • a plastic deformation region similar to the plastic deformation region formed on the back surface of the welded portion of the balance piece may be formed in the welded portion by, for example, peunging treatment by ultrasonic vibration.
  • the torsional fatigue resistance of the welded portion between the steel pipe end and the power transmission portion is improved in the same manner as the torsional fatigue resistance of the welded portion of the balance piece.
  • the base material is 800 N / mm class 2 steel pipe (outer diameter 78.OmmX plate thickness 1.2mm), and a common metal-type ball (plate thickness 1.0mmmm width 50mm X length 50 mm) by spot welding (4 points).
  • the ultrasonic impact treatment was performed on the welded portion from above the balance piece under the conditions shown in Table 1.
  • the ultrasonic impact treatment was not performed, or the treatment was performed under the conditions shown in Table 1.
  • Table 1 also shows the results of subjecting the steel pipe to a torsional fatigue test. Generally, when the number of cycles until the fatigue fracture is greater than 1 0 7, under the conditions, the material than being considered insensitive to fatigue failure, the fatigue test, the number of cycles exceeds 1 0 7 Stopped at that point. From Table 1, it can be seen that in Examples 1 to 8 of the present invention, long-term fatigue durability was obtained, whereas in Comparative Examples 9 to 12 where welding was insufficient or in which the treatment was insufficient, the samples were broken in a short period of time. You can see that. It is clear that the effect of the present invention is remarkable.
  • the high-strength propeller shafts bets tensile strength was welded to Paran Spies to 7 0 0 NZ mm 2 or more steel, increase the resistance to torsional fatigue weld Paransupi over scan, the as a whole
  • the torsional fatigue resistance can be improved by a simple method while maintaining static strength.
  • the present invention can provide a high-strength, lightweight, and durable propeller shaft that contributes to environmental protection at low cost.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Motor Power Transmission Devices (AREA)

Abstract

A high strength propeller shaft, wherein power transmission parts are connected to both ends of a steel pipe with a tensile strength of 700 N/mm2 or higher, a balance piece is welded to the peripheral surface of the steel pipe and, to increase a proof torsional fatigue characteristic, a plastic deformation area is formed at the back of the welded part of the balance piece by, for example, a peening treatment with ultrasonic vibration.

Description

耐久性の優れた高強度プロペラシャフ ト及びその製造方法 High-strength propeller shaft with excellent durability and method for producing the same
〔技術分野〕 〔Technical field〕
本発明は、 乗用車、 トラック、 トラクタ一等の自動車、 車両等に おいてエンジンの推進力を各車輪に伝達するプロペラシャフ トであ 明  The present invention is a propeller shaft for transmitting the propulsive force of an engine to each wheel in a car, a vehicle, such as a passenger car, a truck, and a tractor.
つて、 耐久性、 特に、 耐ねじり疲労特性に優れる高強度プロペラシ ャフ ト とその製造方法に関する。 The present invention also relates to a high-strength propeller having excellent durability, especially torsional fatigue resistance, and a method for producing the same.
書  book
〔背景技術〕  (Background technology)
エンジンの推進力を各車輪に伝達するプロペラシャフ トにおいて は、 高速回転時に振動が少ないことが、 必須の特性と して要求され る。 この対策として、 図 1に示すように、 プロペラシャフ ト 1 の周 面に、 パランスピース 2 をスポッ ト溶接又はプロジェクシヨ ン溶接 で取り付けて、 周方向の重量バランスを調整している （例えば、 自 動車技術ハンドブック、 第 4分冊、 生産 ' 品質 ' 整備編 （ 1 9 9 1 年 9月 1 日初版発行、 社団法人自動車技術会） 、 2 3 3頁、 参照）  In propeller shafts that transmit the propulsion of the engine to each wheel, low vibration at high speed rotation is required as an essential characteristic. As a countermeasure, as shown in Fig. 1, a balance piece 2 is attached to the periphery of the propeller shaft 1 by spot welding or projection welding to adjust the circumferential weight balance (for example, Vehicle Technology Handbook, 4th Volume, Production 'Quality' Maintenance Edition (published first edition on September 1, 1991, Japan Society of Automotive Engineers of Japan), p. 233
しかし、 プロペラシャフ トに、 機動力を繰り返し伝達することに 対応する繰り返しねじり荷重を付加した時、 パランスピースの溶接 部から疲労亀裂が発生することがある。 However, when the propeller shaft is subjected to repeated torsional loads corresponding to the repeated transmission of mobility, fatigue cracks may occur from the welded parts of the balance pieces.
この疲労亀裂の発生によ り、 プロペラシャフ トの長期の耐久性は 損なわれるので、 プロペラシャフ トに用いる鋼管の強度を高めても 、 高強度化による効果 （軽量化等） を充分に得ることができない。 その対策として、 例えば、 特開平 6— 2 4 6 4 4 0号公報に示す よ うに、 プロペラシャフ トにパランスピースを溶接した後、 ノ ラン スピースの取り付け部を局所的に、 又は、 プロペラシャフ トの全体 を加熱して、 応力集中部分の組織を均一化したり、 残留応力を軽減 したりする方法が提案されている。 The long-term durability of the propeller shaft is impaired by the occurrence of the fatigue cracks. Therefore, even if the strength of the steel pipe used for the propeller shaft is increased, it is possible to sufficiently obtain the effect of the higher strength (eg, weight reduction). Can not. As a countermeasure, for example, as shown in JP-A-6-246440, after welding a balance piece to a propeller shaft, A method has been proposed in which the splice attachment area is heated locally or the entire propeller shaft is heated to homogenize the structure of the stress concentrated portion and reduce the residual stress.
しかし、 上記方法によれば、 加熱によ り鋼管の強度が低下するし 、 また、 加熱には大型の加熱設備を必要とするので、 製品コス トが 高くならざるを得ない。  However, according to the above method, the strength of the steel pipe is reduced by heating, and a large heating facility is required for heating, so that the product cost must be increased.
また、 パランスピースを溶接する際、 疲労亀裂の発生起点となる 溶接部を低減する方法が提案されているが、 この方法では、 溶接部 の数が少ないので、 鋼管との間で適正な接合強度を確保することが できず、 プロペラシャフ トの耐久性を高めることにならない。  In addition, a method has been proposed to reduce the number of welds, which are the starting points of fatigue cracks, when welding balance pieces.However, this method has a small number of welds, and therefore has an appropriate joint strength between steel pipes. Therefore, the durability of the propeller shaft cannot be improved.
さらに、 例えば、 特開平 6 - 2 4 9 2 9 1号公報に示すように、 プロペラシャフ トの周面にパランスピースを接着剤で接合し、 疲労 亀裂の発生起点となる溶接部をなく してしまう方法が提案されてい るが、 接着剤の強度は長期使用中に低下してしまうので、 この方法 では、 長期間、 適正な接合強度を確保するこ とができない。  Furthermore, for example, as shown in Japanese Patent Application Laid-Open No. 6-249921, a balance piece is bonded to the peripheral surface of the propeller shaft with an adhesive to eliminate a welded portion that becomes a starting point of fatigue cracks. Although a method has been proposed, the strength of the adhesive decreases during long-term use, and this method cannot ensure proper bonding strength for a long time.
このように、 従来、 プロペラシャフ トの長期の耐久性または寿命 を高める方法が各種提案されているが、 いずれも、 その耐久性又は 寿命は、 必ずしも満足できるものではない。  As described above, various methods have conventionally been proposed for increasing the long-term durability or life of a propeller shaft, but none of these methods is necessarily satisfactory in durability or life.
近年、 プロペラシャフ トにおいては、 環境保護の観点から、 高強 度の、 特に、 引張強度が 7 0 0 N Zmm2以上の鋼管を用いて、 全体 の重量を軽減することが求められているが、 この場合、 パランスピ ースの溶接部における耐ねじり疲労特性が、 プロペラシャフ ト全体 の耐ねじり疲労特性を支配することになる。 Recently, in the propeller shafts bets, from the viewpoint of environmental protection, the high-strength, especially tensile strength with 7 0 0 N Zmm 2 or more steel, but it is required to reduce the overall weight, In this case, the torsional fatigue resistance of the welded part of the paran speed governs the torsional fatigue resistance of the entire propeller shaft.
それ故、 高強度の鋼管を用いてプロペラシャフ トを製造する場合 、 パランスピースの溶接部における耐ねじり疲労特性を、 しかも、 低コス トで高めることが強く求められている。 〔発明の開示〕 Therefore, when manufacturing a propeller shaft using a high-strength steel pipe, it is strongly required to improve the torsional fatigue resistance at the welded portion of the balance piece and at a low cost. [Disclosure of the Invention]
本発明は、 上記要請に応えるべく、 引張強度が 7 0 0 N Zmm2以 上の鋼管に溶接したパラ ンスピースの溶接部の耐ねじり疲労特性を 高めた高強度プロペラシャフ トとその製造方法を提供することを目 的とする。 The present invention is to meet the above requirements, provide a tensile strength 7 0 0 N Zmm 2 high-strength propeller shafts preparative and a manufacturing method thereof with improved resistance to torsional fatigue characteristics of the welded portion of the para Nsupisu welded steel pipe on more than The purpose is to do.
パランスピースを、 スポッ ト溶接又はプロジェクション溶接で鋼 管に取り付けてプロペラシャフ トを製造し、 ねじり疲労試験を実施 すると、 パラ ンスピースの溶接部近傍から疲労亀裂が発生する場合 があるが、 これは、 パラ ンスピースの溶接部においては、 急熱 · 急 冷を受けて、 母材部と異なる金属微細組織が発現し残留応力が生じ ると ともに、 幾何学形状に由縁する応力集中部が形成されているこ とによる （例えば、 特開平 6— 2 4 6 4 4 ◦号公報、 及び、 特開平 6 - 2 4 9 2 9 1号公報、 参照） 。  When a balance piece is attached to a steel pipe by spot welding or projection welding to produce a propeller shaft and a torsional fatigue test is performed, fatigue cracks may be generated near the welded portion of the balance piece. In the welded part of the bracepiece, the metal microstructure different from that of the base metal part is developed due to rapid heating and quenching, residual stress is generated, and a stress concentration part due to the geometric shape is formed This is described (see, for example, Japanese Patent Application Laid-Open No. 6-244644 and Japanese Patent Application Laid-Open No. 6-249291).
本発明者は、 急熱 · 急冷で生じた残留応力を低減すると ともに、 その分布を均一化し、 かつ、 幾何学形状に由縁する応力集中部をな くせば、 パランスピースの溶接部近傍からの疲労亀裂の発生を著し く遅らせることができ、 結果と して、 耐ねじり疲労特性を高めるこ とができるのではないかと発想した。  The inventor of the present invention has found that by reducing the residual stress generated by rapid heating and quenching, by making the distribution uniform, and by eliminating the stress concentration portion due to the geometrical shape, the fatigue of the balance piece from the vicinity of the welded portion can be reduced. The idea was that crack initiation could be significantly delayed, resulting in improved torsional fatigue resistance.
そして、 引張強度が 7 0 0 N Z mm2以上の鋼管にパランスピース を溶接した場合において、 その溶接部の耐ねじり疲労特性を高める 具体的な方策について鋭意検討した。 Then, when the tensile strength was welded to Paransupisu to 7 0 0 NZ mm 2 or more steel was intensively studied concrete measures to improve the resistance to torsional fatigue characteristics of the weld.
その結果、 本発明者は、 パラ ンス ピースの溶接部の背面に、 例え ば、 超音波振動によるピーニング処理で塑性変形領域を形成すれば 、 その溶接部の耐ねじり疲労特性を高めることができることを見い だした。  As a result, the present inventor has found that, for example, if a plastic deformation region is formed on the back surface of a welded portion of a balance piece by peening using ultrasonic vibration, the torsional fatigue resistance of the welded portion can be improved. I found it.
本発明は、 上記知見に基づいてなされたもので、 その要旨とする ところは以下のとおりである。 ( 1 ) 引張強度が 7 0 0 NZinm2以上の鋼管の両端に動力伝達 部が接合され、 かつ、 該鋼管の周面にパランスピースが溶接されて なる高強度プロペラシャフ トにおいて、 パランスピースの溶接部の 背面に塑性変形領域が形成されていることを特徴とする耐久性の優 れた高強度プロペラシャフ ト。 The present invention has been made based on the above findings, and the gist thereof is as follows. (1) In a high-strength propeller shaft in which a power transmission section is joined to both ends of a steel pipe having a tensile strength of 700 NZinm 2 or more and a balance piece is welded to the peripheral surface of the steel pipe, welding of the balance piece is performed. A highly durable high-strength propeller shaft characterized by forming a plastic deformation region on the back of the part.
(2) 前記動力伝達部が溶接で接合されていることを特徴とす る前記 （ 1 ) に記載の耐久性の優れた高強度プロペラシャフ ト。  (2) The high-strength propeller shaft with excellent durability according to (1), wherein the power transmission portion is joined by welding.
( 3 ) 前記動力伝達部の溶接部に塑性変形領域が形成されてい ることを特徴とする前記 （2) に記載の耐久性の優れた高強度プロ ペラシャフ ト。  (3) The high-strength propeller shaft with excellent durability according to (2), wherein a plastic deformation region is formed in a welded portion of the power transmission portion.
( 4 ) 引張強度が 7 0 0 NZmm2以上の鋼管の両端に動力伝達 部が溶接されてなる高強度プロペラシャフ トにおいて、 該溶接部に 塑性変形領域が形成されていることを特徴とする耐久性の優れた高 強度プロペラシャフ ト。 (4) In the high strength and propeller shafts bets power transmission part at opposite ends of the tensile strength 7 0 0 NZmm 2 or more steel is being welded, characterized in that the plastic deformation region to the weld portion is formed durability High strength propeller shaft with excellent properties.
(5) 前記塑性変形領域が、 超音波振動によるピーニング処理 で形成されたものであることを特徴とする前記 （ 1 ) 〜 （4) のい ずれかに記載の耐久性の優れた高強度プロペラシャフ ト。  (5) The high-strength propeller according to any one of (1) to (4), wherein the plastic deformation region is formed by peening using ultrasonic vibration. Shaft.
( 6 ) 引張強度が 7 0 0 NZmm2以上の鋼管の両端に動力伝達 部を接合したプロペラシャフ トの周面にパランスピースを溶接し、 次いで、 溶接部の背面に塑性変形領域を形成することを特徴とする 耐久性の優れた高強度プロペラシャフ トの製造方法。 (6) tensile strength welded Paransupisu the peripheral surface of the propeller shafts bets bonding the power transmission part at opposite ends of the 7 0 0 NZmm 2 or more steel, then forming a plastic deformation area on the back of the weld A method for producing a high-strength propeller shaft having excellent durability.
(7) 前記プロペラシャフ トが、 動力伝達部を溶接で接合した ものであることを特徴とする前記 （6) に記載の耐久性の優れた高 強度プロペラシャフ 卜の製造方法。  (7) The method for producing a high-strength propeller shaft with excellent durability according to the above (6), wherein the propeller shaft is formed by welding a power transmission portion by welding.
( 8 ) 前記動力伝達部の溶接部に塑性変形領域を形成すること を特徴とする前記 （7) に記載の耐久性の優れた高強度プロペラシ ャフ トの製造方法。 ( 9 ) 引張強度が 7 0 0 N Zmm2以上の鋼管の両端に動力伝達 部を溶接し、. 次いで、 溶接部に塑性変形領域を形成することを特徴 とする耐久性の優れた高強度プロペラシャフ トの製造方法。 (8) The method for producing a high-strength propeller shaft having excellent durability according to (7), wherein a plastic deformation region is formed in a welded portion of the power transmission portion. (9) Tensile strength and weld 7 0 0 N Zmm power transmission part at opposite ends of the two or more steel. Then, high strength propellers excellent durability, which comprises forming a plastic deformation region in the weld Shaft manufacturing method.
( 1 0 ) 前記塑性変形領域を、 超音波振動によるピーニング処 理で形成することを特徴とする前記 （ 6 ) 〜 （ 9 ) のいずれかに記 載の耐久性の優れた高強度プロペラシャフ ト。  (10) The high-strength propeller shaft with excellent durability according to any one of the above (6) to (9), wherein the plastic deformation region is formed by a peening process using ultrasonic vibration. .
〔図面の簡単な説明〕 [Brief description of drawings]
図 1 は、 パランスピースを溶接したプロペラシャフ トを示す図で ある。  Figure 1 is a diagram showing a propeller shaft welded with a balance piece.
〔発明を実施するための最良の形態〕 [Best mode for carrying out the invention]
本発明は、 引張強度が 7 0 0 N Zmm2以上の鋼管の周面にバラン スピースを溶接してなる高強度プロペラシャフ トにおいて、 パラン スピースの溶接.部の背面に塑性変形領域を形成することを特徴とす る。 The present invention provides a high-strength propeller shafts bets tensile strength is by welding a balun Spies on the peripheral surface of 7 0 0 N Zmm 2 or more steel pipe to form a plastically deformed area on the back of the weld. Parts of Paran Spies It is characterized by
プロペラシャフ ト と して 、 引張強度が 7 0 0 N Zmm2以上の鋼管 を用いた場合、 パランスピ一スの溶接部からの疲労亀裂の発生が著 しい。 そこで、 本発明では 、 引張強度が 7 0 0 N Zmm2以上の鋼管 を用いた場合における耐ねじり疲労特性の改善を目標と した。 As the propeller shafts bets, if the tensile strength with 7 0 0 N Zmm 2 or more steel, the generation of fatigue cracks from the weld Paransupi Ichisu is remarkable arbitrariness. Therefore, in the present invention, the tensile strength was targeted to improve resistance to torsional fatigue characteristics in the case of using the 7 0 0 N Zmm 2 or more steel.
上記塑性変形領域は、 上記引張強度の鋼管の両端に動力伝達部を 接合したプロペラシャフ トの周面にパランスピースを溶接した後、 パランスピースの溶接部の d冃匕面に、 変形エネルギーを短時間集中的 に付加して形成する。  In the above-mentioned plastic deformation region, after welding a balance piece to the peripheral surface of a propeller shaft in which a power transmission portion is joined to both ends of the above-mentioned tensile strength steel pipe, the deformation energy is reduced to the d-side surface of the welded portion of the balance piece. It is formed by adding time intensively.
具体的には、 超音波振動によるピーユング処理によつ 形成する のが好ましいが、 変形エネルギ一を短時間集中的に付加できる手法 であればよく、 例えば、 シ 3 ッ ト ピーニング処理によっても形成で きる。 Specifically, it is preferable to form by peening process by ultrasonic vibration, but any method that can apply deformation energy intensively for a short time is sufficient. For example, it can be formed by sheet peening process. Wear.
超音波振動によるピーユング処理を用いる場合、 振動数 1 9〜 6 0 k H z、 振幅、 2 0〜 5 0 /z m、 出力 0 . 2〜 3 k Wとすること が好ましい。  In the case of using the Peyung process by ultrasonic vibration, it is preferable that the frequency is 19 to 60 kHz, the amplitude is 20 to 50 / zm, and the output is 0.2 to 3 kW.
この塑性変形領域における塑性変形の程度は、 1 %以上必要であ り、 大きいほど好ましい。 例えば、 パヲンスピースの厚さに対して 、 その 1 0 %以上とすることが必要であり、 1 5 %以上とすること が、 よ り好ましい。  The degree of plastic deformation in this plastic deformation region needs to be 1% or more, and the larger, the better. For example, the thickness is required to be 10% or more of the thickness of the pulse piece, and more preferably 15% or more.
そして、 この塑性変形領域の形成によ り、 パランスピースの溶接 部及び/又は溶接部近傍における残留応力を大幅に低減するととも に、 その分布を均一化し、 かつ、 幾何学形状に由縁する応力集中部 をなくすことができる。 そして、 この結果、 パランスピースの溶接 部近傍からの疲労亀裂の発生を著しく遅らせることができる。  By forming the plastic deformation region, the residual stress in the welded portion and / or the vicinity of the welded portion of the balance piece is significantly reduced, the distribution thereof is made uniform, and stress concentration due to the geometrical shape is caused. Parts can be eliminated. As a result, the generation of fatigue cracks near the welded portion of the balance piece can be significantly delayed.
この塑性変形領域は、 バランスピースの溶接部に対応する背面に 形成してもよいし、 該背面を包むよ うに形成してもよい。 また、 幾 何学形状に由縁する応力集中部は、 溶接部と鋼管母材の境界に沿つ て生成し易いので、 塑性変形領域を、 該境界に沿って形成してもよ い。  The plastic deformation region may be formed on the back surface corresponding to the welded portion of the balance piece, or may be formed so as to surround the back surface. In addition, since the stress concentration portion due to the geometrical shape is easily generated along the boundary between the welded portion and the steel pipe base material, the plastic deformation region may be formed along the boundary.
高強度プロペラシャフ トにおいては、 鋼管端部と動力伝達部の接 合部にもねじり応力が作用するが、 鋼管端部と動力伝達部が、 ァー ク溶接等で接合されている場合、 この溶接部に、 例えば、 超音波振 動によるピーユング処理によって、 パランスピースの溶接部の背面 に形成する塑性変形領域と同様の塑性変形領域を形成してもよい。  In high-strength propeller shafts, torsional stress also acts on the joint between the steel pipe end and the power transmission section.However, when the steel pipe end and the power transmission section are joined by arc welding or the like, this For example, a plastic deformation region similar to the plastic deformation region formed on the back surface of the welded portion of the balance piece may be formed in the welded portion by, for example, peunging treatment by ultrasonic vibration.
この塑性変形領域の形成によ り、 鋼管端部と動力伝達部の溶接部 の耐ねじり疲労特性が、 パランスピースの溶接部の耐ねじり疲労特 性と同様に向上する。  Due to the formation of the plastic deformation region, the torsional fatigue resistance of the welded portion between the steel pipe end and the power transmission portion is improved in the same manner as the torsional fatigue resistance of the welded portion of the balance piece.
次に、 実施例について説明するが、 本発明は、 実施例で採用した 条件に限定されるものではない。 Next, examples will be described, but the present invention is adopted in the examples. The conditions are not limited.
〔実施例〕  〔Example〕
(実施例 1 )  (Example 1)
引張強度 8 0 0 N/mm2級の鋼管 （外径 7 8. O mmX板厚 1 . 2m m) を母材とし、 共金系のパラ ンスピース （板厚 1 . OmmX幅 5 0m m X長さ 5 0 mm) をスポッ ト溶接 （ 4点） にて溶接 ' 固定した。 本 発明例では、 溶接部にパラ ンス ピースの上から、 表 1 に示す条件で 、 超音波衝撃処理を施した。 比較例では、 超音波衝撃処理を施さな いか、 あるいは、 表 1に示す条件で処理した。 The base material is 800 N / mm class 2 steel pipe (outer diameter 78.OmmX plate thickness 1.2mm), and a common metal-type ball (plate thickness 1.0mmmm width 50mm X length 50 mm) by spot welding (4 points). In the present invention example, the ultrasonic impact treatment was performed on the welded portion from above the balance piece under the conditions shown in Table 1. In the comparative example, the ultrasonic impact treatment was not performed, or the treatment was performed under the conditions shown in Table 1.
表 1 には、 上記鋼管をねじり疲労試験に供した結果を、 · 併せて示 す。 一般に、 疲労破断までのサイクル数が 1 07を超える場合には 、 その条件下で、 その材料は疲労破壊に対して不感と考えられるの で、 疲労試験は、 サイクル数が 1 07を超えた時点で中止した。 表 1から、 本発明例 1〜 8では、 長期の疲労耐久性が得られてい るのに対して、 溶接まま、 あるいは、 処理が不充分な比較例 9〜 1 2では、 短期間で破断していることが分かる。 本発明の効果が顕著 であることは明らかである。 Table 1 also shows the results of subjecting the steel pipe to a torsional fatigue test. Generally, when the number of cycles until the fatigue fracture is greater than 1 0 7, under the conditions, the material than being considered insensitive to fatigue failure, the fatigue test, the number of cycles exceeds 1 0 7 Stopped at that point. From Table 1, it can be seen that in Examples 1 to 8 of the present invention, long-term fatigue durability was obtained, whereas in Comparative Examples 9 to 12 where welding was insufficient or in which the treatment was insufficient, the samples were broken in a short period of time. You can see that. It is clear that the effect of the present invention is remarkable.
表 1 table 1
No. 振幅 周波数 ハンマーの先端 処理速度 疲労破断までの ( μ m) (kHz) 曲率半径（mm)
Figure imgf000008_0001
サイクル数No. Amplitude Frequency Hammer tip Processing speed Until fatigue fracture (μm) (kHz) Curvature radius (mm)
Figure imgf000008_0001
Number of cycles
1 50 20 1.3 0.4 >107 1 50 20 1.3 0.4> 10 7
2 60 25 1.7 0.5 >107 本 3 40 50 1.6 0.6 >107 2 60 25 1.7 0.5> 10 7 pieces 3 40 50 1.6 0.6> 10 7
4 50 35 1.6 0.7 >107 明 5 40 30 1.5 0.5 >107 例 6 30 40 1.7 0.8 >107 4 50 35 1.6 0.7> 10 7 Light 5 40 30 1.5 0.5> 10 7 Example 6 30 40 1.7 0.8> 10 7
7 40 40 1.5 0.5 >107 7 40 40 1.5 0.5> 10 7
8 60 45 1.3 0.4 >107 8 60 45 1.3 0.4> 10 7
9 3X105 比 9 3X10 5 ratio
10 8 20 2 0.7 7X105 10 8 20 2 0.7 7X10 5
11 10 22 2.3 0.5 5X105 例 11 10 22 2.3 0.5 5X10 5 examples
12 1X105 〔産業上の利用可能性〕 12 1X10 5 [Industrial applicability]
本発明によれば、 引張強度が 7 0 0 N Z mm2以上の鋼管にパラン スピースを溶接した高強度プロペラシャフ トにおいて、 パランスピ ースの溶接部の耐ねじり疲労特性を高め、 全体と しての耐ねじり疲 労特性を、 静的強度等を維持しつつ簡易な方法で高めることができ る。 According to the present invention, the high-strength propeller shafts bets tensile strength was welded to Paran Spies to 7 0 0 NZ mm 2 or more steel, increase the resistance to torsional fatigue weld Paransupi over scan, the as a whole The torsional fatigue resistance can be improved by a simple method while maintaining static strength.
したがって、 本発明は環境の保護に資する高強度で軽量、 かつ、 耐久性に優れたプロペラシャフ トを、 低コス トで提供することがで きる。  Therefore, the present invention can provide a high-strength, lightweight, and durable propeller shaft that contributes to environmental protection at low cost.

Claims

1 . 引張強度が 7 0 0 N Z mm2以上の鋼管の両端に動力伝達部が 接合され、 かつ、 該鋼管の周面にパランスピースが溶接されてなる 高強度プロペラシャフ トにおいて、 パランス ピースの溶接部の背面 に塑性変形領域が形成されていることを特徴とする耐久性の優れた 高強度プロペラシャフ ト胄。 1. Tensile strength power transmission unit is joined to both ends of the 7 0 0 NZ mm 2 or more steel, and, in the high strength and propeller shafts bets Paransupisu the peripheral surface of the steel tube is formed by welding, welding Palance piece Durable, high-strength propeller shaft with a plastically deformed area formed on the back of the part.
2 . 前記動力伝達部が溶接で接合されていることを特徴とする請 求の範囲 1 に記載の耐久性の優れのた高強度プロペラシャフ ト。  2. The high-strength propeller shaft having excellent durability according to claim 1, wherein the power transmission portion is joined by welding.
3 . 前記動力伝達部の溶接部に塑性変形領域が形成されているこ とを特徴とする請求の範囲 2に記載の耐久囲性の優れた高強度プロべ ラシャフ ト。  3. The high-strength roller shaft with excellent durable enclosure according to claim 2, wherein a plastic deformation region is formed in a welded portion of the power transmission portion.
4 . 引張強度が 7 0 0 N / mm2以上の鋼管の両端に動力伝達部が 溶接されてなる高強度プロペラシャフ トにおいて、 該溶接部に塑性 変形領域が形成されていることを特徴とする耐久性の優れた高強度 プロペラシャフ ト。 4 in. Tensile strength high strength propeller shafts bets power transmission part at opposite ends of the 7 0 0 N / mm 2 or more steel is being welded, characterized in that the plastic deformation region to the weld portion is formed High-strength propeller shaft with excellent durability.
5 . 前記塑性変形領域が、 超音波振動によるピーニング処理で形 成されたものであることを特徴とする請求の範囲 1 〜 4のいずれか 1項に記載の耐久性の優れた高強度プロペラシャフ ト。  5. The high-strength propeller shaft with excellent durability according to any one of claims 1 to 4, wherein the plastic deformation region is formed by peening using ultrasonic vibration. G.
6 . 引張強度が 7 0 0 N Z mm2以上の鋼管の両端に動力伝達部を 接合したプロペラシャフ 卜の周面にパランスピースを溶接し、 次い で、 溶接部の背面に塑性変形領域を形成するこ とを特徴とする耐久 性の優れた高強度プロペラシャフ トの製造方法。 6. Tensile strength welded Paransupisu the peripheral surface of the propeller shafts Bok bonding the power transmission part at opposite ends of the 7 0 0 NZ mm 2 or more steel, then in forming a plastic deformation area on the back of the weld A method for producing a high-strength propeller shaft with excellent durability.
7 . 前記プロペラシャフ トが、 動力伝達部を溶接で接合したもの であることを特徴とする請求の範囲 6に記載の耐久性の優れた高強 度プロペラシャフ トの製造方法。  7. The method for producing a high-strength propeller shaft with excellent durability according to claim 6, wherein the propeller shaft is formed by joining a power transmission portion by welding.
8 . 前記動力伝達部の溶接部に塑性変形領域を形成するこ とを特 徴とする請求の範囲 7に記載の耐久性の優れた高強度プロペラシャ フ トの製造方法。 8. It is characterized by forming a plastic deformation area in the welding part of the power transmission part. 8. The method for producing a high-strength propeller shaft having excellent durability according to claim 7.
9 . 引張強度が 7 0 0 N Zmin2以上の鋼管の両端に動力伝達部を 溶接し、 次いで、 溶接部に塑性変形領域を形成することを特徴とす る耐久性の優れた高強度プロペラシャフ トの製造方法。 9. Tensile strength is the power transmission portion is welded to both ends of the 7 0 0 N Zmin 2 or more steel, then high strength propeller shafts of forming a plastically deformed region and excellent durability you wherein the weld Manufacturing method.
1 0 . 前記塑性変形領域を、 超音波振動によるピーニング処理で 形成することを特徴とする請求の範囲 6 〜 9のいずれか 1項に記载 の耐久性の優れた高強度プロペラシャフ ト。  10. The high-strength propeller shaft having excellent durability according to any one of claims 6 to 9, wherein the plastic deformation region is formed by peening using ultrasonic vibration.
PCT/JP2003/013876 2002-10-30 2003-10-29 High strength propeller shaft with excellent durability, and method of manufacturing the propeller shaft WO2004040153A1 (en)

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CN110426461A (en) * 2019-08-02 2019-11-08 中广核检测技术有限公司 A kind of pipeline winding-preventing mechanism

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JP6860952B2 (en) 2017-06-30 2021-04-21 日立Astemo株式会社 Power transmission shaft and its manufacturing method

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JPH07266230A (en) * 1994-03-29 1995-10-17 Toshiba Corp Method and device for reforming structural material

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JPH0551692A (en) * 1991-03-25 1993-03-02 Sumitomo Metal Ind Ltd High strength electric resistance-welded tube for automobile use excellent in fatigue characteristic
JPH06246439A (en) * 1993-02-24 1994-09-06 Nippon Steel Corp High performance automobile driving shaft excellent in torsional fatigue characteristics
JPH07266230A (en) * 1994-03-29 1995-10-17 Toshiba Corp Method and device for reforming structural material

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WO2008043821A1 (en) * 2006-10-11 2008-04-17 Ablynx N. V. Amino acid sequences that bind to serum proteins in a manner that is essentially independent of the ph, compounds comprising the same, and use thereof
CN110426461A (en) * 2019-08-02 2019-11-08 中广核检测技术有限公司 A kind of pipeline winding-preventing mechanism
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