JP2009085364A - Bend fitting for high pressure hose and its manufacturing method - Google Patents

Bend fitting for high pressure hose and its manufacturing method Download PDF

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JP2009085364A
JP2009085364A JP2007257349A JP2007257349A JP2009085364A JP 2009085364 A JP2009085364 A JP 2009085364A JP 2007257349 A JP2007257349 A JP 2007257349A JP 2007257349 A JP2007257349 A JP 2007257349A JP 2009085364 A JP2009085364 A JP 2009085364A
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seamless pipe
pressure hose
nipple
pipe
manufacturing
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JP5104173B2 (en
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Ken Yoneoka
賢 米丘
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a bend fitting for a high pressure hose and its manufacturing method capable of improving repeated pressurization performance even when a seamless pipe manufactured by a common manufacturing method is applied to a bend fitting for a high pressure hose, and capable of suppressing material costs by simplifying work for improving inner face properties of a pipe. <P>SOLUTION: In embodiment of the invention, an inner wall face corresponding to a bending portion X of the seamless pipe 1 is machined to a predetermined roughness by a cutting tool in a step before carrying out press contact of a head part 2 and a nipple 3 to both ends of the seamless pipe 1, and inner face wrinkles, thickness deviation, or the like is removed. After the cutting work, press contact of the head part 2 and the nipple 3 to both ends of the seamless pipe 1 is carried out, and then, the bending portion X of the seamless pipe 1 is bent to a predetermined angle using a bending device or the like. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、高圧ホース用ベンド金具及びその製造方法に係わり、更に詳しくは一般の製造方法で製造されたシームレスパイプを使用しても繰返し加圧性能を向上させることが出来ると共に、材料のコストの低減させることが出来る高圧ホース用ベンド金具及びその製造方法に関するものである。   The present invention relates to a high-pressure hose bend fitting and a method for manufacturing the same, and more specifically, it is possible to repeatedly improve the pressurizing performance even when a seamless pipe manufactured by a general manufacturing method is used, and to reduce the cost of the material. The present invention relates to a high-pressure hose bend fitting that can be reduced and a method for manufacturing the same.

従来、パイプ（ベンドパイプ）の両端にヘッド部とニップルとを設けた高圧ホース用ベンド金具を製造する方法としては、例えば、無垢の金属棒を全切削加工する方法、また安価な製造方法として、パイプ（ベンドパイプ），ヘッド部，ニップルの各部品をロウ付けや摩擦圧接等により接合する方法が知られている。   Conventionally, as a method of manufacturing a high-pressure hose bend fitting provided with a head portion and a nipple at both ends of a pipe (bend pipe), for example, as a method of completely cutting a solid metal rod, and as an inexpensive manufacturing method, There are known methods for joining pipe (bend pipe), head, and nipple parts by brazing or friction welding.

上記の接合による方法の場合、パイプ（ベンドパイプ：曲げパイプ）はシームレスパイプを使用する事が多いが、シームレスパイプはその製法上、造管時に発生する内面皺、偏肉は引き抜き工程後にも残り（軸方向に連続している）、高圧ホース用ベンド金具として使用する場合、ベンド部扁平化及び皺部における応力集中により、該皺部を起点としてベンド部軸方向に疲労破壊による割れが発生することがあり、また耐久寿命にバラツキが生じると言う問題があった。特に、扁平に起因する応力集中部に皺が合致した際には顕著となるものである。   In the case of the above-mentioned joining method, pipes (bend pipes: bent pipes) are often seamless pipes. However, seamless pipes are used in the manufacturing process, and internal flaws and uneven thickness that occur during pipe making remain after the drawing process. When used as a high-pressure hose bend fitting (continuous in the axial direction), cracking due to fatigue failure occurs in the axial direction of the bend section starting from the flange section due to flattening of the bend section and stress concentration in the flange section. In addition, there is a problem that the durability life varies. In particular, it becomes prominent when wrinkles coincide with stress concentration portions caused by flatness.

一般に高圧ホース用ベンド金具に用いるような汎用の鋼管（シームレスパイプ）では、上記のように製造工程において内面皺、偏肉は避けられず、従来では圧延率を調整することで内面皺、偏肉を小さく抑え、その上でショットブラストにより内面皺を取り除くと言うパイプの製造方法の出願が提案されているが（例えば、特許文献１参照）、このような製造方法の出願は、1,000MPa級の高強度材で、自動車のドライブシャフトやスタビライザー等の特殊用途に用いられるもので、高価であり、高圧ホース用ベンド金具に用いるような低炭素鋼管には使用されていないのが現状である。
特開平６−６３６１３号公報 Generally, in general-purpose steel pipes (seamless pipes) used for bend fittings for high-pressure hoses, inner surface defects and uneven thickness are unavoidable in the manufacturing process as described above. An application for a method of manufacturing a pipe is proposed in which the inner surface flaws are removed by shot blasting (see, for example, Patent Document 1). It is a high-strength material that is used for special applications such as drive shafts and stabilizers for automobiles, is expensive, and is not currently used in low-carbon steel pipes used for bend fittings for high-pressure hoses.
JP-A-6-63613

この発明はかかる従来の問題点に着目し、一般的な製法で製造されたシームレスパイプを高圧ホース用ベンド金具に適用しても、繰返し加圧性能の向上を図ることが出来、パイプの内面性状を良化するための作業を簡略化して材料コストを抑制することが出来る高圧ホース用ベンド金具及びその製造方法を提供することを目的とするものである。   The present invention pays attention to such conventional problems, and even when a seamless pipe manufactured by a general manufacturing method is applied to a bend fitting for a high pressure hose, it is possible to repeatedly improve the pressurizing performance, and the inner surface properties of the pipe. An object of the present invention is to provide a high-pressure hose bend fitting and a method for manufacturing the same, which can simplify the work for improving the pressure and suppress the material cost.

この発明は上記目的を達成するため、この発明の高圧ホース用ベンド金具は、シームレスパイプの両端にヘッド部とニップルとを圧接加工し、前記シームレスパイプを所定の角度に曲げ加工して成る高圧ホース用ベンド金具であって、前記シームレスパイプの曲げ加工部の内壁面を、所定の粗さに加工したことを要旨とするものである。   In order to achieve the above object, the high pressure hose bend fitting of the present invention is a high pressure hose formed by pressure-welding a head portion and a nipple at both ends of a seamless pipe and bending the seamless pipe to a predetermined angle. It is a bend metal fitting, and the gist is that the inner wall surface of the bent portion of the seamless pipe is processed to a predetermined roughness.

ここで、前記曲げ加工部の内壁面を、切削加工により所定の粗さに加工し、また曲げ加工部の内壁面の仕上げを、JIS BO601 に基づき、Ry6.3 〜Ry35の粗さに加工するものである。   Here, the inner wall surface of the bent portion is processed to a predetermined roughness by cutting, and the inner wall surface of the bent portion is processed to a roughness of Ry6.3 to Ry35 based on JIS BO601. Is.

また、この発明の高圧ホース用ベンド金具の製造方法は、所定の長さに形成されたシームレスパイプの両端にヘッド部とニップルとを圧接加工する前の段階で、前記シームレスパイプの曲げ加工部分の対応する内壁面を所定の粗さに加工し、この加工終了後、前記シームレスパイプの両端にヘッド部とニップルとを圧接加工し、シームレスパイプを所定の角度に曲げ加工することを要旨とするものである。   The method of manufacturing a high-pressure hose bend fitting according to the present invention includes a step of bending the seamless pipe at a stage before the head portion and the nipple are press-bonded to both ends of the seamless pipe formed to a predetermined length. The gist is that the corresponding inner wall surface is processed to a predetermined roughness, and after the completion of the processing, the head portion and the nipple are pressed to both ends of the seamless pipe, and the seamless pipe is bent to a predetermined angle. It is.

ここで、前記シームレスパイプの曲げ加工部分の対応する内壁面を所定の粗さに加工する際に、シームレスパイプの内壁面の皺を除去するものである。   Here, wrinkles on the inner wall surface of the seamless pipe are removed when the corresponding inner wall surface of the bent portion of the seamless pipe is processed to a predetermined roughness.

このように構成することで、一般的な製法で製造されたシームレスパイプを高圧ホース用ベンド金具に適用しても、繰返し加圧性能の向上を図ることが出来るものである。   With such a configuration, even when a seamless pipe manufactured by a general manufacturing method is applied to a bend fitting for a high-pressure hose, repeated pressurization performance can be improved.

この発明は上記のように構成したので、以下のような優れた効果を奏するものである。
(a).一般的な製法で製造されたシームレスパイプを高圧ホース用ベンド金具に適用しても、繰返し加圧性能の向上を図ることが出来る。例えば、耐久回数の向上、バラツキを小さくすることができ、素材購入コストの低減等を期待することが出来る。
(b).パイプの内面性状を良化させるための引き抜き回数の増加や、強度確保のための過度な肉厚増をしなくてすみ、作業を簡略化して材料コストを抑制することが出来る。 Since the present invention is configured as described above, the following excellent effects can be obtained.
(a) Even when a seamless pipe manufactured by a general manufacturing method is applied to a bend fitting for a high-pressure hose, repeated pressurization performance can be improved. For example, it is possible to expect an improvement in the number of endurance cycles, a small variation, and a reduction in material purchase cost.
(b) It is not necessary to increase the number of extractions to improve the inner surface properties of the pipe and to increase the thickness excessively to ensure the strength, simplifying the operation and suppressing the material cost.

以下、添付図面に基づき、この発明の実施形態を説明する。
図１〜図３は、この発明の高圧ホース用ベンド金具の製造工程の説明図を示し、図１はシームレスパイプ１の両端にヘッド部２とニップル３とを圧接加工する前の分解半断面図、図２はシームレスパイプ１の両端にヘッド部２とニップル３とを直線的に圧接加工した状態の半断面図、図３はシームレスパイプ１を所定の角度（この実施形態では９０°であるが角度については限定されない）に曲げ加工したベンド金具４の半断面図を示している。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 3 are explanatory views of a manufacturing process of a high-pressure hose bend fitting according to the present invention, and FIG. 1 is an exploded half sectional view before a head part 2 and a nipple 3 are pressed to both ends of a seamless pipe 1. 2 is a half sectional view showing a state in which the head portion 2 and the nipple 3 are linearly pressed at both ends of the seamless pipe 1. FIG. 3 shows the seamless pipe 1 at a predetermined angle (in this embodiment, 90 °). A half cross-sectional view of the bent metal fitting 4 that is bent to an angle is not limited) is shown.

この実施形態では、シームレスパイプ１として所定の長さの構造用炭素鋼管を使用し、このシームレスパイプ１にヘッド部２とニップル３とを圧接加工する前の工程で、シームレスパイプ１の曲げ加工部Ｘの領域の内壁面を、所定の粗さ(Ry)（例えば、最大高さ、JIS BO601;1994に基づき、Ry 6.3（μm)〜Ry35（μm)）に加工する。   In this embodiment, a structural carbon steel pipe having a predetermined length is used as the seamless pipe 1, and the bending portion of the seamless pipe 1 is processed before the head portion 2 and the nipple 3 are pressed into the seamless pipe 1. The inner wall surface in the region X is processed to a predetermined roughness (Ry) (for example, maximum height, Ry 6.3 (μm) to Ry35 (μm) based on JIS BO601; 1994).

前記粗さ(Ry)を 6.3（μm)とした理由は、一般に切削加工で出せる粗さの規定はRy 6.3（μm)であり、これ以下の粗さ要求になると研削加工等を追加する必要が出てくる為、簡便にと言う目的から外れることになる。また粗さ(Ry)を、35（μm)）に規定する理由は、後述の耐久回数の測定の結果、１００万回でワレの発生が確認され、繰返し加圧性能の向上効果が小さいからである。   The reason why the roughness (Ry) is set to 6.3 (μm) is that the regulation of roughness that can be produced by cutting is generally Ry 6.3 (μm). If the roughness requirement is less than this, it is necessary to add grinding processing etc. Because it comes out, it will deviate from the simple purpose. The reason for defining the roughness (Ry) to 35 (μm) is that cracking has been confirmed at 1 million times as a result of measuring the number of endurances described later, and the effect of improving repeated pressurization performance is small is there.

その測定方法は、JIS BO651 に規定された触針式表面粗さ測定機で粗さ曲線を測定して、測定範囲( 評価長さ) における最大山と最大谷の和を以て、最大高さとしている。   The measuring method is to measure the roughness curve with a stylus type surface roughness measuring instrument stipulated in JIS BO651, and the maximum height is the sum of the maximum peak and maximum valley in the measurement range (evaluation length). .

また、測定時の基準長さ(1r)は、JIS BO633 （表面清浄評価の方式及び手順）に規定されている値で行っている。   The reference length (1r) at the time of measurement is the value specified in JIS BO633 (method and procedure for surface cleaning evaluation).

具体的には、例えば、直径15ｍｍ〜60.5ｍｍのシームレスパイプ１の場合には、シームレスパイプ１の内面に形成されている内面皺や偏肉等をドリルやターニング等の切削工具により、切削代として、0.05〜0.3mm 程度切削する。切削範囲としては、ベンドに因り楕円変化が生じる範囲を切削加工するものである。   Specifically, for example, in the case of a seamless pipe 1 having a diameter of 15 mm to 60.5 mm, an inner surface wrinkle or uneven thickness formed on the inner surface of the seamless pipe 1 is used as a cutting allowance by a cutting tool such as a drill or turning. Cut about 0.05-0.3mm. As the cutting range, the range where the elliptical change occurs due to the bend is cut.

なお、内面皺の除去方法として、上記のようにドリルでも切削可能であるが、パイプ外面チャックによるターニングであれば、皺の除去に併せて素材偏肉の均一化も図ることが出来る。   As a method for removing the inner surface flaws, cutting can be performed with a drill as described above. However, if turning is performed with a pipe outer surface chuck, the uneven thickness of the material can be made uniform along with the removal of the wrinkles.

この発明の実施形態では、シームレスパイプ１の両端にヘッド部２とニップル３とを圧接加工する前の段階で、前記シームレスパイプ１の曲げ加工部分Ｘの対応する内壁面を切削工具により所定の粗さに加工し、内面皺や偏肉等を取り除く。そして、この切削加工終了後、前記シームレスパイプ１の両端にヘッド部２とニップル３とを圧接加工し、その後に曲げ加工装置等を用いてシームレスパイプ１の曲げ加工部分Ｘを所定の角度に曲げ加工するものである。   In the embodiment of the present invention, before the head portion 2 and the nipple 3 are pressed on both ends of the seamless pipe 1, the inner wall surface corresponding to the bent portion X of the seamless pipe 1 is cut into a predetermined rough surface by a cutting tool. Processed to remove internal flaws and uneven thickness. Then, after the cutting process is finished, the head part 2 and the nipple 3 are pressure-bonded to both ends of the seamless pipe 1, and then the bending part X of the seamless pipe 1 is bent to a predetermined angle using a bending apparatus or the like. To be processed.

この発明の実施形態のように一般のシームレスパイプ１を使用して高圧ホース用ベンド金具を製造する方法においては、シームレスパイプ１は一般に偏肉厚は肉厚の増加と共に大きくなり、また引き抜き回数を増やしても１／１００ｍｍ台の内面皺は残ってしまう。   In the method of manufacturing a high-pressure hose bend fitting using a general seamless pipe 1 as in the embodiment of the present invention, the uneven thickness of the seamless pipe 1 generally increases as the thickness increases, and the number of times of drawing is increased. Even if it increases, the inner surface flaw of 1 / 100mm level will remain.

この発明の実施例では、ヘッド部２とニップル３とを圧接加工する前の段階で、シームレスパイプ１の曲げ加工部分Ｘの対応する内壁面を切削工具により切削して内面皺等を除去し、その後に曲げ加工（ベンド加工）を行うことで、内面切削を行わないで曲げ加工（ベンド加工）を行った場合に較べて耐久回数（金具にホースを接続し、以下に示す繰返し流体圧力を加え、ベンド部に割れが発生した回数を耐久回数とした）を大幅に向上出来ることが判った。   In the embodiment of the present invention, the inner wall surface corresponding to the bent portion X of the seamless pipe 1 is cut with a cutting tool before the head portion 2 and the nipple 3 are pressure-welded to remove inner surface flaws, etc. After that, by bending (bending), the number of endurance (connecting a hose to the metal fitting and applying the repeated fluid pressure shown below) is compared to when bending (bending) without cutting the inner surface. It was found that the number of times the crack occurred in the bend portion was regarded as the durability number).

上記の耐久回数の測定方法としては、JIS K6349;1982に準拠して測定し、最高使用圧力 34.5 MPa ×150%の繰返し衝撃圧力を加え、その結果、Ry 6.3（μm)〜Ry35（μm)の金具は、耐久回数がいずれも３００万回で試験を打ち切り、その内壁面を切削加工しなかった金具は、耐久回数が１００万回であった。この時のパイプサイズは、φ36(mm)×φ24(t6)(mm)で実施した。   As a method of measuring the above-mentioned durability, the measurement was performed in accordance with JIS K6349; 1982, and a repeated impact pressure of maximum working pressure 34.5 MPa x 150% was applied. For the metal fittings, the test was aborted at the endurance of 3 million times, and the endurance of the metal fittings whose inner wall surface was not cut was 1 million times. The pipe size at this time was φ36 (mm) × φ24 (t6) (mm).

以上のように、この発明の実施例ではシームレスパイプ１の両端にヘッド部２とニップル３とを圧接加工する前の段階で、前記シームレスパイプ１の曲げ加工部分Ｘの対応する内壁面を切削工具により所定の粗さに加工し、内面皺や偏肉等を取り除き、切削加工終了後、前記シームレスパイプ１の両端にヘッド部２とニップル３とを圧接加工し、その後に曲げ加工装置等を用いてシームレスパイプ１の曲げ加工部分Ｘを所定の角度に曲げ加工するので、一般的な製法で製造されたシームレスパイプを高圧ホース用ベンド金具に適用しても、繰返し加圧性能の向上を図ることが出来る。例えば、耐久回数の向上、バラツキを小さくすることができ、素材購入コストの低減等を期待することが出来る。また、パイプの内面性状を良化するための引き抜き回数の増加や、強度確保のための過度な肉厚増をしなくてすみ、作業を簡略化して材料コストを抑制することが出来るものである。   As described above, according to the embodiment of the present invention, the inner wall surface corresponding to the bent portion X of the seamless pipe 1 is cut into the cutting tool before the head portion 2 and the nipple 3 are pressure-welded at both ends of the seamless pipe 1. Is processed to a predetermined roughness, inner surface flaws and uneven thickness are removed, and after finishing the cutting, the head portion 2 and the nipple 3 are pressure-bonded to both ends of the seamless pipe 1, and thereafter a bending apparatus or the like is used. Since the bent portion X of the seamless pipe 1 is bent at a predetermined angle, repeated pressurization performance can be improved even if the seamless pipe manufactured by a general manufacturing method is applied to a high-pressure hose bend fitting. I can do it. For example, it is possible to expect an improvement in the number of endurance cycles and variations, and a reduction in material purchase costs. In addition, it is possible to simplify the work and suppress the material cost by eliminating the increase in the number of times of drawing for improving the inner surface properties of the pipe and the excessive increase in the thickness for securing the strength. .

シームレスパイプの両端にヘッド部とニップルとを圧接加工する前の工程の分解半断面図である。It is an exploded half sectional view of a process before carrying out pressure welding processing of a head part and a nipple at both ends of a seamless pipe. シームレスパイプの両端にヘッド部とニップルとを直線的に圧接加工した状態の半断面図である。It is a half cross-sectional view of a state in which a head portion and a nipple are linearly pressed at both ends of a seamless pipe. シームレスパイプを所定の角度に曲げ加工したベンド金具の半断面図である。It is a half cross-sectional view of a bend fitting obtained by bending a seamless pipe at a predetermined angle.

符号の説明Explanation of symbols

１ シームレスパイプ
２ ヘッド部
３ ニップル
４ ベンド金具
Ｘ 曲げ加工部 1 Seamless pipe 2 Head 3 Nipple 4 Bend fitting X Bending part

Claims (5)

シームレスパイプの両端にヘッド部とニップルとを圧接加工し、前記シームレスパイプを所定の角度に曲げ加工して成る高圧ホース用ベンド金具であって、
前記シームレスパイプの曲げ加工部の内壁面を、所定の粗さに加工したことを特徴とする高圧ホース用ベンド金具。 A high pressure hose bend fitting formed by pressure-welding a head part and a nipple at both ends of a seamless pipe and bending the seamless pipe to a predetermined angle,
A bend fitting for a high-pressure hose, wherein an inner wall surface of a bent portion of the seamless pipe is processed to a predetermined roughness. 前記曲げ加工部の内壁面を、切削加工により所定の粗さに加工した請求項１に記載の高圧ホース用ベンド金具。   The bend fitting for high-pressure hoses according to claim 1, wherein an inner wall surface of the bent portion is machined to a predetermined roughness. 前記曲げ加工部の内壁面の仕上げを、JIS BO601 に基づき、Ry6.3 〜Ry35の粗さに加工した請求項１または２に記載の高圧ホース用ベンド金具。   The bend fitting for a high-pressure hose according to claim 1 or 2, wherein the inner wall surface of the bent portion is finished to a roughness of Ry6.3 to Ry35 based on JIS BO601. 所定の長さに形成されたシームレスパイプの両端にヘッド部とニップルとを圧接加工する前の段階で、前記シームレスパイプの曲げ加工部分の対応する内壁面を所定の粗さに加工し、この加工終了後、前記シームレスパイプの両端にヘッド部とニップルとを圧接加工し、シームレスパイプを所定の角度に曲げ加工することを特徴とする高圧ホース用ベンド金具の製造方法。   Before the head part and the nipple are pressed on both ends of the seamless pipe formed to a predetermined length, the corresponding inner wall surface of the bent part of the seamless pipe is processed to a predetermined roughness, and this processing is performed. A method of manufacturing a high-pressure hose bend fitting, comprising: pressing the head portion and the nipple at both ends of the seamless pipe after finishing, and bending the seamless pipe to a predetermined angle. 前記シームレスパイプの曲げ加工部分の対応する内壁面を所定の粗さに加工する際に、シームレスパイプの内壁面の皺を除去する請求項４に記載の高圧ホース用ベンド金具の製造方法。   The method for manufacturing a bend fitting for a high-pressure hose according to claim 4, wherein wrinkles on the inner wall surface of the seamless pipe are removed when the inner wall surface corresponding to the bent portion of the seamless pipe is processed to a predetermined roughness.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05154536A (en) * 1991-12-02 1993-06-22 Usui Internatl Ind Co Ltd Manufacture of pipe having thick thickness and small diameter
JP2002022079A (en) * 2000-06-30 2002-01-23 Tokai Rubber Ind Ltd Hose equipped with joint metal fitting and its manufacturing method
JP2003074341A (en) * 2001-08-31 2003-03-12 Futaba Industrial Co Ltd Exhaust tube manufacturing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05154536A (en) * 1991-12-02 1993-06-22 Usui Internatl Ind Co Ltd Manufacture of pipe having thick thickness and small diameter
JP2002022079A (en) * 2000-06-30 2002-01-23 Tokai Rubber Ind Ltd Hose equipped with joint metal fitting and its manufacturing method
JP2003074341A (en) * 2001-08-31 2003-03-12 Futaba Industrial Co Ltd Exhaust tube manufacturing method

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