JP5677466B2 - Method for manufacturing elastic rail clip - Google Patents

Method for manufacturing elastic rail clip Download PDF

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JP5677466B2
JP5677466B2 JP2012550340A JP2012550340A JP5677466B2 JP 5677466 B2 JP5677466 B2 JP 5677466B2 JP 2012550340 A JP2012550340 A JP 2012550340A JP 2012550340 A JP2012550340 A JP 2012550340A JP 5677466 B2 JP5677466 B2 JP 5677466B2
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load
bent rod
deflection
amount
rod
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JP2013518196A (en
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スティーブン ジョン コックス
スティーブン ジョン コックス
ディヴィッド ローズ
ディヴィッド ローズ
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Pandrol Ltd
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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
    • B21D53/00—Making other particular articles
    • B21D53/36—Making other particular articles clips, clamps, or like fastening or attaching devices, e.g. for electric installation
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00—Fastening rails on sleepers, or the like
    • E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
    • E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
    • E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00—Fastening rails on sleepers, or the like
    • E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
    • E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
    • E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
    • E01B9/303—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped bar

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Clamps And Clips (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Railway Tracks (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)

Description

本発明は、弾性レールクリップの製造方法に関する。   The present invention relates to a method for manufacturing an elastic rail clip.

例えば英国特許GB1510224A号明細書及び欧州特許第EP0619852B号明細書に示され且つ説明されているように、様々な形態の弾性レールクリップが知られている。弾性レールクリップを製造する公知の方法は、金属ロッド（通常は鋼製）を所定の形状に曲げ、次いで、曲げたロッドをクリップの最終形態を達成するために冷間硬化工程にかけることを含む。   Various forms of elastic rail clips are known, for example as shown and described in British Patent GB1510224A and European Patent EP0619852B. A known method of manufacturing an elastic rail clip includes bending a metal rod (usually made of steel) into a predetermined shape and then subjecting the bent rod to a cold hardening process to achieve the final shape of the clip. .

そのようなロッドは、曲げたロッドを形成する金属の弾性限界まで共通の傾き（クリップ剛性）を持つ共通の荷重−たわみ特性を有する。冷間硬化は、曲げたロッドに弾性限界を越えさせるようになっており、それによって、その後負荷を取り除きもう一度荷重−たわみ特性を取ると、はるかに高い荷重まで、即ち新しい特性が当初のロッドの特性と交差する荷重まで、荷重−たわみ特性が線形になるように、得られたクリップに永久ひずみ（残留ひずみ）を引き起こす。冷間硬化で重要な問題の１つは、クリップが作られる金属ロッドが、典型的にはロックウェル硬度４４から４８の間で硬さが違うことである。より柔らかい金属で作られたロッドの弾性限界は、より硬い金属で作られたロッドの弾性限界よりも低いので、全てのロッドが一定のたわみにされる場合、それらは全て僅かに異なる平行線を辿って無荷重となり、異なる変動量の残留ひずみを獲得するであろう。より柔らかいロッドにより多くの残留ひずみを獲得し、より硬いロッドはより小さな残留ひずみを獲得するだろう。これを添付図面の図１Ａに示す。図１Ａは、柔らかいクリップと硬いクリップの荷重−たわみ特性、及び冷間硬化後のそれらの間の残留ひずみの差ΔSを示す。残留ひずみのこの違いにより、異なる形状（既に製造に固有の変動に加えて）を有するクリップをもたらし、この場合形状は硬さに依存する。かくして、これらの冷間硬化クリップは、硬さにかかわらず、全て同じ剛性を有するが、これらのクリップを、それらを全て同じ量だけたわませる固定組立体に打ち込むことにより、クリップは鉄道レールに当たるクリップの部分（「トー」）にわずかに異なる荷重を発生させる。冷間硬化されるべき各クリップの硬さを、冷間硬化工程の開始直前に測定することは実務的ではない。さらに、添付図面の図１Ｂ及び図１Ｃに示すように、単純に冷間硬化中に加えられる一定量のたわみを変えることによって（図１Ｂ）、あるいは、一定のたわみの代わりに一定の力を加えること（図１Ｃ）によっては、この問題を克服することができない。何故ならば、これは根本的な問題に取り組んでいないからである。 Such rods have a common load-deflection characteristic with a common slope (clip stiffness) up to the elastic limit of the metal forming the bent rod. Cold hardening causes the bent rod to exceed the elastic limit, so that if the load is subsequently removed and the load-deflection characteristic is taken again, up to a much higher load, i.e., the new characteristic is that of the original rod. Permanent strain (residual strain) is caused in the resulting clip so that the load-deflection characteristic is linear up to a load that intersects the characteristic. One important issue with cold hardening is that the metal rods from which the clips are made typically differ in hardness between Rockwell hardness 44-48. The elastic limit of rods made of softer metal is lower than the elastic limit of rods made of harder metal, so if all rods have a constant deflection, they all have slightly different parallel lines. Tracing will result in no load and different amounts of residual strain will be acquired. A softer rod will gain more residual strain and a harder rod will gain less residual strain. This is illustrated in FIG. 1A of the accompanying drawings. FIG. 1A shows the load-deflection characteristics of soft and hard clips and the residual strain difference Δ S between them after cold hardening. This difference in residual strain results in a clip with a different shape (in addition to variations inherent in manufacturing), where the shape depends on hardness. Thus, these cold-hardened clips all have the same stiffness, regardless of hardness, but by hitting these clips into a fixed assembly that deflects them all the same amount, the clips hit the rail A slightly different load is generated on the clip part ("toe"). It is not practical to measure the hardness of each clip to be cold cured immediately before the start of the cold curing process. In addition, as shown in FIGS. 1B and 1C of the accompanying drawings, a constant force is simply applied by changing the amount of deflection applied during cold curing (FIG. 1B), or instead of a constant deflection. (FIG. 1C) cannot overcome this problem. This is because it does not address the underlying problem.

過去に、この問題に取り組む試みでは、ロッドを何回も繰り返し冷間硬化させているが、これは完全に有効ではない。   In the past, attempts to tackle this problem have repeatedly cold-hardened the rod, but this is not completely effective.

本発明の第１の態様の一実施形態によれば、既知の硬さ値の範囲内の硬さ値を有する金属で製造されたロッドを所定の形状に曲げることと、次いで、曲げたロッドに所定量の永久ひずみを生じさせるために、曲げたロッドを冷間硬化工程にかけることと、を含む弾性レールクリップの製造方法において、冷間硬化工程が、曲げたロッドの部分の第１の量のたわみを生じさせるように、その曲げたロッドの部分に第１の荷重を加えることを含み、第１の荷重は、上記硬さ値の範囲の中で最高の硬さ値を有する金属の降伏点に達するのに必要な値と等しい又はそれよりも大きい値を有する所定の荷重であり、さらに、所定の第１の荷重を加えることで達成された曲げたロッドの上記部分の第１のたわみ量を測定することと、測定したたわみ量に基づき、（i）曲げたロッドの上記部分に加えられるときに、曲げたロッドに所定量の永久ひずみを獲得させる第２の荷重か、（ii）曲げたロッドに所定量の永久ひずみを生じさせるために必要な、曲げたロッドの上記部分の第２のたわみ量の何れかを決定することと、決定した第２の荷重を曲げたロッドの上記部分に加えること、又は曲げたロッドの上記部分を決定した第２のたわみ量だけたわませることと、を含む、弾性レールクリップの製造方法を提供する。   According to one embodiment of the first aspect of the present invention, a rod made of a metal having a hardness value within a range of known hardness values is bent into a predetermined shape, and then the bent rod is Subjecting the bent rod to a cold hardening step to produce a predetermined amount of permanent strain, wherein the cold hardening step is a first amount of the portion of the bent rod. Applying a first load to the bent rod portion so as to cause a deflection of the metal, the first load being a yield of the metal having the highest hardness value within the range of hardness values. A first load of said portion of the bent rod that is a predetermined load having a value equal to or greater than that required to reach the point, and further achieved by applying a predetermined first load; Based on the measured amount of deflection and (I) a second load that causes the bent rod to acquire a predetermined amount of permanent strain when applied to the portion of the bent rod, or (ii) causes a predetermined amount of permanent strain to the bent rod. Determining any of the second amount of deflection of the bent rod portion required to apply, and applying the determined second load to the bent rod portion, or the bent rod portion. A method of manufacturing an elastic rail clip, comprising: bending a determined second deflection amount.

本発明の第２の態様の一実施形態によれば、既知の硬さ値の範囲内の硬さ値を有する金属で製造されたロッドを所定の形状に曲げることと、次いで、曲げたロッドに所定量の永久ひずみを生じさせるために、曲げたロッドを冷間硬化工程にかけることと、を含む弾性レールクリップの製造方法において、冷間硬化工程が、上記硬さ値の範囲の中で最高の硬さ値を有する金属の降伏点に達するのに必要な値と等しい又はそれよりも大きい値を有する第１の荷重を加えることによって、曲げたロッドの部分を第１の所定量だけたわませることと、第１の所定たわみ量を達成するのに必要な第１の荷重の量を測定することと、測定した第１の荷重に基づき、（i）曲げたロッドに所定量の永久ひずみを生じさせるために必要な第２のたわみ量か、（ii）曲げたロッドの上記部分に加えられるときに、曲げたロッドに所定量の永久ひずみを獲得させる第２の荷重の何れかを決定することと、曲げたロッドの上記部分を決定した第２のたわみ量だけたわませること、又は決定した第２の荷重を曲げたロッドの上記部分に加えることと、を含む、弾性レールクリップの製造方法を提供する。   According to one embodiment of the second aspect of the present invention, a rod made of a metal having a hardness value within a range of known hardness values is bent into a predetermined shape, and then the bent rod is Subjecting the bent rod to a cold hardening step to produce a predetermined amount of permanent strain, wherein the cold hardening step is the highest in the range of hardness values. By applying a first load having a value equal to or greater than that required to reach the yield point of a metal having a hardness value of Measuring the amount of first load required to achieve the first predetermined deflection amount, and (i) a predetermined amount of permanent strain on the bent rod based on the measured first load. The second amount of deflection necessary to produce Determining any of a second load that, when applied to the portion of the bent rod, causes the bent rod to acquire a predetermined amount of permanent strain; and a second deflection determining the portion of the bent rod Deflection by an amount, or applying a determined second load to the portion of the bent rod.

今、例として、添付図面を参照する。   Reference will now be made, by way of example, to the accompanying drawings.

以前に提案された方法により冷間硬化された、異なる硬さの２つのレールクリップの荷重−たわみ特性を示す線図である。FIG. 4 is a diagram showing the load-deflection characteristics of two rail clips of different hardness, cold-cured by a previously proposed method. 以前に提案された方法により冷間硬化された、異なる硬さの２つのレールクリップの荷重−たわみ特性を示す線図である。FIG. 4 is a diagram showing the load-deflection characteristics of two rail clips of different hardness, cold-cured by a previously proposed method. 以前に提案された方法により冷間硬化された、異なる硬さの２つのレールクリップの荷重−たわみ特性を示す線図である。FIG. 4 is a diagram showing the load-deflection characteristics of two rail clips of different hardness, cold-cured by a previously proposed method. 本発明の実施形態で使用される２つの異なる冷間硬化工程を示す。Figure 2 illustrates two different cold curing processes used in embodiments of the present invention. 本発明の実施形態で使用される２つの異なる冷間硬化工程を示す。Figure 2 illustrates two different cold curing processes used in embodiments of the present invention. 本発明の実施形態で使用される冷間硬化工程の一部を受けているレールクリップを示す図である。It is a figure which shows the rail clip which has received a part of cold hardening process used by embodiment of this invention. 残留ひずみを冷間硬化処理によって生じさせた、冷間硬化後の同じレールクリップを示す図である。It is a figure which shows the same rail clip after the cold hardening which produced the residual distortion by the cold hardening process. それぞれ異なる硬さの２つのレールクリップの荷重−たわみ特性を示す線図であり、太線は、クリップが本発明を実施する方法により冷間硬化された後の特性を示し、細線は冷間硬化前のクリップの特性を示し、図４Ａは本発明の第１態様を実施する方法に対応する。It is a diagram which shows the load-deflection characteristic of two rail clips of different hardness each, A thick line shows the characteristic after a clip is cold-cured by the method of implementing this invention, and a thin line is before cold-curing FIG. 4A corresponds to the method of practicing the first aspect of the present invention. それぞれ異なる硬さの２つのレールクリップの荷重−たわみ特性を示す線図であり、太線は、クリップが本発明を実施する方法により冷間硬化された後の特性を示し、細線は冷間硬化前のクリップの特性を示し、図４Ｂは本発明の第２態様を実施する方法に対応する。It is a diagram which shows the load-deflection characteristic of two rail clips of different hardness each, A thick line shows the characteristic after a clip is cold-cured by the method of implementing this invention, and a thin line is before cold-curing FIG. 4B corresponds to the method of practicing the second aspect of the present invention.

本発明の実施形態によれば、図２Ａ又は図２Ｂのフロー図に示すように、既知の硬さ値の範囲内の硬さ値を有する金属ロッドを、所定のクリップ形状に曲げ（図３Ａを参照）、次いで金属ロッドは２段階冷間硬化工程を受ける。まず、ロッドに、硬さ値の範囲の最高の硬さ値を有するロッドの降伏点と等しい又はこれを超えるレベルまで荷重をかける（ステップ１）。次いで、使用される方法に応じて、加えられた一定の力Ｆ0からステップ１でどの程度のたわみｄXが生じたか（ステップ２、図２Ａ）、又は、一定のたわみｄ0に達するのにステップ１でどの程度の力ＦXが要求されたか（ステップ２、図２Ｂ）の、何れかの測定をする。本発明の第１態様を実施する図２Ａの方法では、次に、測定されたたわみｄXを、より大きい力又はたわみをロッドに加える、工程の第２段階で、曲げロッドに所定量の永久ひずみＳを引き起こすために必要な力Ｆ0＋ΔＦXの量、又は第２のたわみ量ｄX＋ΔｄXを決定するために使用する（ステップ３、図２Ａ）。同様に、本発明の第２態様を実施する図２Ｂの方法では、測定された力ＦXを、より大きいたわみ又は力をロッドに加える、工程の第２段階で、曲げロッドに所定量の永久ひずみＳを引き起こすために必要なたわみｄ0＋ΔｄXの量、又は第２の荷重ＦX＋ΔＦXを決定するために使用する（ステップ３、図２Ｂ）。各ケースで、測定値は、例えば所定のルックアップテーブルを参照することにより、又は計算により、必要な追加の力／たわみを見出すために機器によって（及び／又は人によって）使用される。第２の処理段階（ステップ４）で、図４Ａ及び図４Ｂに示すように、得られたクリップ（図３Ｂ参照）が常に、元のロッドの初期荷重−たわみ特性と平行な線に沿って位置する上の点まで硬化されるように、ロッドの硬さに応じて異なる量の、前段階のステップ３で決定された力又はたわみをロッドにかける。言い換えると、図４Ａ及び図４Ｂに示すように、無荷重時には、各クリップが常にこの線の延長線に沿って後退し、かくして、この方法を使用して製造された全てのクリップは、ロッドの硬さにかかわらず、互いに同じ量の残留ひずみを有し、したがって同じ仕上り形状を有する。かくして、本発明を実施する方法を採用することにより、冷間硬化工程後のクリップの形状を厳密に定めることができ、特に、冷間硬化工程前のクリップの形状よりももっと正確に定められ得る。 According to the embodiment of the present invention, as shown in the flow chart of FIG. 2A or 2B, a metal rod having a hardness value within a range of known hardness values is bent into a predetermined clip shape (see FIG. 3A). See), and then the metal rod is subjected to a two-step cold hardening process. First, the rod is loaded to a level equal to or exceeding the yield point of the rod having the highest hardness value in the range of hardness values (step 1). Then, depending on the method used, how much deflection d X occurred in step 1 from the applied constant force F 0 (step 2, FIG. 2A) or to reach a certain deflection d 0. Any measurement of how much force F X is required in step 1 (step 2, FIG. 2B) is made. In the method of FIG. 2A embodying the first aspect of the present invention, the measured deflection d X is then applied to the bending rod by a predetermined amount in the second stage of the process in which a greater force or deflection is applied to the rod. This is used to determine the amount of force F 0 + ΔF X required to cause the strain S, or the second deflection amount d X + Δd X (step 3, FIG. 2A). Similarly, in the method of FIG. 2B embodying the second aspect of the present invention, the measured force F X is applied to the bending rod by a predetermined amount in the second stage of the process where a greater deflection or force is applied to the rod. It is used to determine the amount of deflection d 0 + Δd X required to cause the strain S, or the second load F X + ΔF X (step 3, FIG. 2B). In each case, the measured value is used by the instrument (and / or by a person) to find out the additional force / deflection needed, for example by referring to a predetermined look-up table or by calculation. In the second processing stage (step 4), as shown in FIGS. 4A and 4B, the resulting clip (see FIG. 3B) is always positioned along a line parallel to the initial load-deflection characteristic of the original rod. Apply different amounts of the force or deflection determined in the previous step 3 to the rod, depending on the hardness of the rod, so that it is cured to the upper point. In other words, as shown in FIGS. 4A and 4B, when no load is applied, each clip always retracts along the extension of this line, and thus all clips manufactured using this method are Regardless of hardness, they have the same amount of residual strain and therefore have the same finished shape. Thus, by adopting the method of practicing the present invention, the shape of the clip after the cold curing step can be precisely defined, and in particular, it can be determined more accurately than the shape of the clip before the cold curing step. .

図４Ａは、本発明の第１態様を実施する方法による冷間硬化前（細線）と冷間硬化後（太線）の、それぞれ異なる硬さのクリップの荷重−たわみ特性を示し、加えられる一定の力Ｆ0をクリップに加えることによってどの程度のたわみｄH（硬いクリップ）又はｄS（柔らかいクリップ）が生じたかの測定が行われ、次いで、そのクリップについて測定されたたわみ（ｄH／ｄS）は、所定量の永久ひずみＳを達成するために必要な力の量Ｆ0＋ΔＦH（硬いクリップ）若しくはＦ0＋ΔＦS（柔らかいクリップ）、又はたわみ量ｄH＋ΔｄH（硬いクリップ）若しくはｄS＋ΔｄS（柔らかいクリップ）を決定するために使用される。この方法で冷間硬化された全てのクリップは、硬さ範囲の全体にわたって、同じ残留ひずみＳを有するであろう。同様に、図４Ｂは、本発明の第２態様を実施する方法による冷間硬化前（細線）と冷間硬化後（太線）の、それぞれ異なる硬さのクリップの荷重−たわみ特性を示し、クリップの一定のたわみｄ0を達成するためにどの程度の力ＦH（硬いクリップ）又はＦS（柔らかいクリップ）が要求されるかの測定が行われ、次いで、クリップについて測定された力（ＦH／ＦS）は、所定量の永久ひずみＳを達成するために必要なたわみ量ｄ0＋ΔｄH（硬いクリップ）若しくはｄ0＋ΔｄS（柔らかいクリップ）、又は力の量ＦH＋ΔＦH（硬いクリップ）若しくはＦS＋ΔＦS（柔らかいクリップ）を決定するために使用される。この方法で冷間硬化された全てのクリップは、硬さ範囲の全体にわたって、同じ残留ひずみＳを有するであろう。 FIG. 4A shows the load-deflection characteristics of clips of different hardness before cold hardening (thin line) and after cold hardening (thick line) according to the method of carrying out the first aspect of the present invention. A measurement is made of how much deflection d H (hard clip) or d S (soft clip) is produced by applying force F 0 to the clip, and then the deflection (d H / d S ) measured for that clip. Is the amount of force F 0 + ΔF H (hard clip) or F 0 + ΔF S (soft clip) or the amount of deflection d H + Δd H (hard clip) or d S required to achieve a given amount of permanent strain S. Used to determine + Δd S (soft clip). All clips cold-cured in this way will have the same residual strain S over the entire hardness range. Similarly, FIG. 4B shows the load-deflection characteristics of clips with different hardness before and after cold hardening (thin line) and after cold hardening (thick line) according to the method of carrying out the second aspect of the present invention. A measurement is made of how much force F H (hard clip) or F S (soft clip) is required to achieve a constant deflection d 0 , then the measured force (F H / F S ) is the amount of deflection d 0 + Δd H (hard clip) or d 0 + Δd S (soft clip) or the amount of force F H + ΔF H (hard clip) required to achieve a given amount of permanent strain S ) Or F S + ΔF S (soft clip). All clips cold-cured in this way will have the same residual strain S over the entire hardness range.

この方法は、瞬時に効果的に決定することができ、そのため、力及びたわみ制御を有するタイプの油圧機器を使用する場合に、特に有利である。なぜならば、これにより、冷間硬化工程にほとんど途切れがないからである。   This method can be determined effectively in an instant and is therefore particularly advantageous when using hydraulic equipment of the type with force and deflection control. This is because there is almost no interruption in the cold curing process.

Claims (2)

既知の硬さ値の範囲内の硬さ値を有する金属で製造されたロッドを所定の形状に曲げることと、次いで、曲げたロッドに所定量の永久ひずみを生じさせるために、曲げたロッドを冷間硬化工程にかけることと、を含む弾性レールクリップの製造方法において、冷間硬化工程が、
曲げたロッドの部分に第１のたわみ量を生じさせるように、その曲げたロッドの部分に第１の荷重を加えることを含み、第１の荷重は、上記硬さ値の範囲の中で最高の硬さ値を有する金属の降伏点に達するのに必要な値と等しい又はそれよりも大きい値を有する所定の荷重であり、
さらに、第１の所定荷重を加えることで達成された曲げたロッドの上記部分の第１のたわみ量を測定することと、
測定したたわみ量に基づき、（i）曲げたロッドの上記部分に加えられるときに、曲げたロッドに所定量の永久ひずみを獲得させる第２の荷重か、（ii）曲げたロッドに所定量の永久ひずみを生じさせるために必要な、曲げたロッドの上記部分の第２のたわみ量の何れかを決定することと、
決定した第２の荷重を曲げたロッドの上記部分に加えること、又は曲げたロッドの上記部分を決定した第２のたわみ量だけたわませることと、を含む、弾性レールクリップの製造方法。 In order to bend a rod made of a metal having a hardness value within a range of known hardness values into a predetermined shape, and then to generate a predetermined amount of permanent strain in the bent rod, Subjecting to a cold curing step, and a method for producing an elastic rail clip, comprising:
Including applying a first load to the bent rod portion so as to produce a first deflection in the bent rod portion, the first load being the highest in the range of hardness values. A predetermined load having a value equal to or greater than that required to reach the yield point of a metal having a hardness value of
Measuring the first deflection of the portion of the bent rod achieved by applying a first predetermined load;
Based on the measured deflection, either (i) a second load that causes the bent rod to acquire a predetermined amount of permanent strain when applied to the portion of the bent rod, or (ii) a predetermined amount of the bent rod Determining any of the second amount of deflection of the portion of the bent rod that is required to cause permanent set;
Applying the determined second load to the portion of the bent rod, or deflecting the portion of the bent rod by the determined second deflection amount. 既知の硬さ値の範囲内の硬さ値を有する金属で製造されたロッドを所定の形状に曲げることと、次いで、曲げたロッドに所定量の永久ひずみを生じさせるために、曲げたロッドを冷間硬化工程にかけることと、を含む弾性レールクリップの製造方法において、冷間硬化工程が、
上記硬さ値の範囲の中で最高の硬さ値を有する金属の降伏点に達するのに必要な値と等しい又はそれよりも大きい値を有する第１の荷重を加えることによって、所定の曲げたロッドの部分を第１のたわみ量だけたわませることと、
第１の所定たわみ量を達成するのに必要な第１の荷重の量を測定することと、
測定した第１の荷重に基づき、（i）曲げたロッドに所定量の永久ひずみを生じさせるために必要な第２のたわみ量か、（ii）曲げたロッドの上記部分に加えられるときに、曲げたロッドに所定量の永久ひずみを獲得させる第２の荷重の何れかを決定することと、
曲げたロッドの上記部分を決定した第２のたわみ量だけたわませること、又は決定した第２の荷重を曲げたロッドの上記部分に加えることと、を含む、弾性レールクリップの製造方法。 In order to bend a rod made of a metal having a hardness value within a range of known hardness values into a predetermined shape, and then to generate a predetermined amount of permanent strain in the bent rod, Subjecting to a cold curing step, and a method for producing an elastic rail clip, comprising:
By applying a first load having a value equal to or greater than that required to reach the yield point of the metal having the highest hardness value in the range of hardness values. Deflecting the rod portion by the first deflection amount;
Measuring a first load amount necessary to achieve a first predetermined deflection amount;
Based on the measured first load, (i) a second amount of deflection required to cause the bent rod to produce a predetermined amount of permanent strain, or (ii) when applied to the portion of the bent rod, Determining any of the second loads that cause the bent rod to acquire a predetermined amount of permanent strain;
A method of manufacturing an elastic rail clip, comprising: deflecting the portion of the bent rod by a determined second deflection amount, or applying a determined second load to the portion of the bent rod.
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