JP6515274B2 - Device and method for manufacturing end-thickened steel pipe - Google Patents
Device and method for manufacturing end-thickened steel pipe Download PDFInfo
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- JP6515274B2 JP6515274B2 JP2014205035A JP2014205035A JP6515274B2 JP 6515274 B2 JP6515274 B2 JP 6515274B2 JP 2014205035 A JP2014205035 A JP 2014205035A JP 2014205035 A JP2014205035 A JP 2014205035A JP 6515274 B2 JP6515274 B2 JP 6515274B2
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本発明は、素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管を製造する製造装置および製造方法に関する。 The present invention relates to a manufacturing apparatus and manufacturing method for manufacturing an end-thickened steel pipe in which the thickness of the axial end is increased more than the thickness of the material steel pipe.
例えばトーションビーム、排気マフラー、小径かつ厚肉のドライブシャフト、さらにはＢピラー等の自動車部品や建材の中には、肉厚が一定の鋼管を素材とし（以下、このような鋼管を「素材鋼管」という）、この素材鋼管に口拡げ加工（拡管加工）を行うことによって製造されるものがある。素材鋼管から製造される部品の口拡げ加工に伴って素材鋼管の肉厚は減少する。 For example, in automobile parts and construction materials such as torsion beams, exhaust mufflers, small diameter and thick drive shafts, and B-pillars, steel pipes having a constant thickness are used as materials (hereinafter such steel pipes are referred to as “material steel pipes” In some cases, the material steel pipe is manufactured by performing an opening process (expanding process) on the material steel pipe. The thickness of the material steel pipe decreases with the expansion processing of the parts manufactured from the material steel pipe.
減肉の程度によっては、部品、特に肉厚減少に関する制限が厳しい自動車部品の肉厚に関する設計要件を満足できないことがあるとともに、最悪の場合には拡管加工された部分で割れが発生し、所望の自動車部品を製造できないことがある。 Depending on the degree of thickness reduction, the design requirements for the wall thickness of parts, especially automotive parts with severe limitations on thickness reduction may not be satisfied, and in the worst case cracking occurs in the expanded section, which is desirable. May not be able to produce
自動車部品の成形時に問題となるこのような減肉を抑制する方法の一つとして、成形後の素材鋼管における減肉が予見される部位の肉厚を、口拡げ加工を行われる前に事前に増加させる増肉加工を行って増肉鋼管としておくことが知られる。素材鋼管よりも肉厚が増加した増肉鋼管を簡易に予成形することができれば、その後に例えば口拡げ加工等の、増肉鋼管の肉厚を減少させる二次加工により増肉鋼管に減肉が生じても、二次加工後の自動車部品の肉厚に関する設計要件を満足することが可能である。 As one of the methods for suppressing such a reduction in thickness when forming automobile parts, the thickness of the portion where the reduction in thickness in the material steel pipe after formation is foreseen is made in advance before being subjected to an opening process. It is known to carry out a process of increasing the thickness of the steel to increase the thickness as a steel pipe. If it is possible to easily pre-form a thick-walled steel pipe whose thickness is larger than that of a raw material steel pipe, then it is reduced to a thick-walled steel pipe by secondary processing such as opening expansion processing to reduce the thickness of the thickened steel pipe. Although it occurs, it is possible to satisfy the design requirements for the thickness of the automotive part after secondary processing.
特許文献１〜３には、冷間での口広げ加工に用いる工具の形状を工夫することにより素材鋼管を増肉させて増肉鋼管を製造する発明が開示されている。 Patent documents 1-3 disclose invention which manufactures a steel pipe of increased thickness by increasing the thickness of a material steel pipe by devising the shape of a tool used for open mouth processing in cold.
特許文献２により開示された発明によれば、確かに、口拡げ加工の前後における外径をＤ０，Ｄ１とした場合に{（Ｄ１−Ｄ０）／Ｄ０}×１００（％）として規定される拡管率５０％の口広げ加工において増肉鋼管の管端部が破断することがない。 According to the invention disclosed by Patent Document 2, it is true that when the outer diameter before and after mouth-opening processing is D 0 , D 1 {(D 1 −D 0 ) / D 0 } × 100 (%) The pipe end portion of the steel pipe with increased thickness does not break in the opening process of 50% expansion ratio defined as
しかし、特許文献２により開示された発明によっても、さらに大きい拡管率、例えば拡管率８０％で増肉鋼管を成形しようとすると、増肉鋼管の最管端部での減肉が過大になり、最後まで成形できずに最管端部で破断するおそれがある。 However, according to the invention disclosed in Patent Document 2, when attempting to form a steel pipe with an even greater pipe expansion rate, for example, a pipe expansion rate of 80%, the thickness reduction at the outermost end of the steel pipe increases excessively. There is a possibility that the tube can be broken at the end of the tube without being able to be molded to the end.
本発明者らは、上記課題を解決するために鋭意検討を重ねた結果、冷間で、金型の内部に配置された素材鋼管の端面を、軸押しパンチにより素材鋼管の軸方向へ押し込むことにより、素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管を製造する際に、
（Ａ）金型として、素材鋼管を内部に収容し、素材鋼管の外径と略同じ外径を有することにより素材鋼管を増肉させない非増肉部と、素材鋼管の外径よりも大きな内径を有することにより素材鋼管を増肉させる増肉部とを有する金型を用いるとともに、軸押しパンチとして、金型における増肉部の内径と略同じ外径を有する本体と、この本体に素材鋼管の軸方向へ向けて延びて設けられる芯金とを有するパンチを用いること、
（Ｂ）素材鋼管を素材鋼管の軸方向について金型に固定すること、
（Ｃ）素材鋼管の軸方向への芯金の長さを、この軸方向への増肉部の長さよりも長く設定すること、および
（Ｄ）芯金の外径を素材鋼管の内径よりも小さくすること
により、素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管を簡易に成形することができることを知見し、さらに検討を重ねて本発明を完成した。本発明は以下に列記の通りである。
As a result of intensive studies to solve the above-mentioned problems, the present inventors are pushing the end face of the material steel pipe disposed inside the mold in a cold state in the axial direction of the material steel pipe by means of an axial pressing punch. When manufacturing an end-thickened steel pipe in which the thickness of the axial end is increased more than the thickness of the material steel pipe,
(A) A material steel pipe is accommodated inside as a mold, and by having an outer diameter substantially the same as the outer diameter of the material steel pipe, a non-thickened portion which does not increase the thickness of the material steel pipe and an inner diameter larger than the outer diameter of the material steel pipe Using a die having an increased thickness portion for increasing the thickness of the material steel pipe by having the main body, and a main body having an outer diameter substantially the same as the inner diameter of the increased thickness portion in the die as an axial pressing punch; Using a punch having a cored bar extending in the axial direction of
(B) Fixing a material steel pipe to a mold in the axial direction of the material steel pipe,
(C) setting the length of the core metal in the axial direction of the material steel pipe to be longer than the length of the thickened portion in the axial direction, and (D) setting the outer diameter of the core metal to be larger than the inner diameter of the material steel pipe It was found that by making it smaller, it is possible to easily form an end-thickened steel pipe in which the thickness of the axial end is increased more than the thickness of the material steel pipe, and further studies were repeated to complete the present invention. The present invention is as listed below.
（１）内部に素材鋼管を配置する金型と、冷間で前記素材鋼管の端面を該素材鋼管の軸方向へ押し込むことにより前記素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管を製造する軸押しパンチとを備え、
前記金型は、前記素材鋼管の外径と略同じ外径を有することにより前記素材鋼管を増肉させない非増肉部と、前記素材鋼管の外径よりも大きな内径を有することにより前記素材鋼管を前記素材鋼管の外側へ増肉させる増肉部とを有すること、
前記軸押しパンチは、前記金型における前記増肉部の内径と略同じ外径を有する本体と、該本体に前記素材鋼管の軸方向へ向けて延びて設けられる芯金とを有する
パンチを用いること、
前記素材鋼管は、該素材鋼管の軸方向について前記金型に対して相対的に固定されること、
前記素材鋼管の軸方向への前記芯金の長さは、該軸方向への前記増肉部の長さよりも長いこと、および
前記軸押しパンチによる前記素材鋼管の軸押し動作開始時点には前記芯金と前記素材鋼管との間に全周に亘ってクリアランスを形成するために、且つ、前記軸押しパンチによる前記素材鋼管の軸押し動作の最中には前記素材鋼管を前記芯金とは反対側へ向かう方向としての前記増肉部側へ向けて増肉するために、前記芯金の外径が前記素材鋼管の内径よりも小さくされていること
を特徴とする端部増肉鋼管の製造装置。
(1) The thickness of the end portion in the axial direction is increased more than the thickness of the material steel pipe by pressing the end surface of the material steel pipe in the axial direction of the material steel pipe by pressing the end face of the material steel pipe cold And axial punches to produce hardened end-walled steel pipes,
The metal mold has a non-thickened portion that does not increase the thickness of the material steel pipe by having an outer diameter substantially the same as the outer diameter of the material steel pipe, and the material steel pipe by having an inner diameter larger than the outer diameter of the material steel pipe. And an increase in thickness of the material steel pipe .
The axial pressing punch uses a punch having a main body having an outer diameter substantially the same as the inner diameter of the thickened portion in the mold and a cored bar extending in the axial direction of the material steel pipe on the main body. about,
The material steel pipe is fixed relative to the mold in the axial direction of the material steel pipe,
The length of the core metal in the axial direction of the material steel pipe is longer than the length of the thickened portion in the axial direction, and the axial pressing operation of the material steel pipe by the axial pressing punch is started. In order to form a clearance over the entire circumference between the core metal and the material steel pipe, and in the middle of the axial pushing operation of the material steel pipe by the axial pushing punch, the material steel pipe is the core metal The outer diameter of the core is made smaller than the inner diameter of the material steel pipe in order to increase the thickness toward the thickness increasing portion as the direction toward the opposite side, manufacturing device.
（２）前記素材鋼管の内径と前記芯金の外径との差は、前記金型における前記増肉部の内径と前記素材鋼管の外径との差の２０〜４０％であることを特徴とする１項に記載された端部増肉鋼管の製造装置。 (2) The difference between the inside diameter of the material steel pipe and the outside diameter of the core metal is 20 to 40% of the difference between the inside diameter of the thickened portion of the mold and the outside diameter of the material steel pipe An apparatus for manufacturing an end-wall-thickened steel pipe as described in 1 above.
（３）前記金型における前記増肉部の内径と前記素材鋼管の外径との差は、前記素材鋼管の軸方向へ、一定であること、テーパ状に変化すること、または段差状に変化することを特徴とする１項または２項に記載された端部増肉鋼管の製造装置。 (3) The difference between the inner diameter of the thickened portion in the mold and the outer diameter of the material steel pipe is constant in the axial direction of the material steel pipe, changes in a tapered shape, or changes in a step shape An apparatus for producing an end-wall-thickened steel pipe as set forth in any one of the above items 1 or 2, characterized in that:
（４）前記芯金の先端角部は面取り部またはテーパ形状部であることを特徴とする１項から３項までのいずれか１項に記載された端部増肉鋼管の製造装置。 (4) The apparatus for manufacturing an end-wall-thickened steel pipe according to any one of the items 1 to 3, wherein the end corner of the cored bar is a chamfered part or a tapered part.
（５）１項から４項までのいずれか１項に記載された製造装置を用い、前記金型の内部に配置された素材鋼管の端面を、前記軸押しパンチにより前記素材鋼管の軸方向へ押し込むことにより、前記端面の近傍の前記素材鋼管を前記金型の前記増肉部へ向けて増肉させることによって、前記素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管を製造することを特徴とする端部増肉鋼管の製造方法。 (5) Using the manufacturing apparatus described in any one of the items 1 to 4, the end face of the material steel pipe disposed inside the mold is made in the axial direction of the material steel pipe by the axial pressing punch An end portion in which the thickness of the end portion in the axial direction is larger than the thickness of the material steel pipe by increasing the thickness of the material steel pipe in the vicinity of the end face toward the thickness increasing portion of the mold by pressing. A method for producing an end-wall-thickened steel pipe characterized by producing a wall-thickened steel pipe.
本発明により、大きい拡管率、例えば拡管率８０％であっても、素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管を簡易に製造することができる。 According to the present invention, even if the pipe expansion ratio is large, for example, 80%, it is possible to easily manufacture an end portion-thickened steel pipe in which the thickness of the axial end portion is larger than the thickness of the material steel pipe.
添付図面を説明しながら、本発明を説明する。
１．製造装置
図１は、本発明に係る製造方法及び製造装置１を説明するための断面図である。
The invention will now be described with reference to the accompanying drawings.
1. Manufacturing Apparatus FIG. 1 is a cross-sectional view for explaining a manufacturing method and a manufacturing apparatus 1 according to the present invention.
図１に示すように、製造装置１は、金型２と、軸押しパンチ３とを有するので、これらの構成要素を説明する。 As shown in FIG. 1, since the manufacturing apparatus 1 has a mold 2 and an axial pressing punch 3, these components will be described.
金型２は、その内部に素材鋼管４を配置する。素材鋼管４は、素材鋼管４の軸方向について金型２に対して相対的に固定される。素材鋼管４を金型２に相対的に固定するには、素材鋼管４の管端部４ａを適宜手段により固定すること、素材鋼管４の軸方向の途中４ｂを適宜手段により把持すること、素材鋼管４の管端部４ａも軸方向へ同時に押し込むこと、または素材鋼管４を軸方向へ屈曲させて金型２の内面と当接させること等が例示される。素材鋼管４を金型２に相対的に固定することにより、素材鋼管４が押し込まれて移動することを防止できる。 The mold 2 arranges the material steel pipe 4 inside thereof. The material steel pipe 4 is fixed relative to the mold 2 in the axial direction of the material steel pipe 4. In order to relatively fix the material steel pipe 4 to the mold 2, fix the pipe end 4 a of the material steel pipe 4 by an appropriate means, hold the middle 4 b of the material steel pipe 4 in the axial direction by an appropriate means, The pipe end 4a of the steel pipe 4 may also be pressed simultaneously in the axial direction, or the material steel pipe 4 may be bent in the axial direction and brought into contact with the inner surface of the mold 2. By relatively fixing the material steel pipe 4 to the mold 2, it is possible to prevent the material steel pipe 4 from being pushed in and moved.
本発明は、例えば、
（ａ）増肉加工前の素材鋼管４の肉厚をｔ０とし、外径をＤとした場合に、比（ｔ０／Ｄ）が２〜１０％の範囲、かつｔ０＝１．０〜５．０ｍｍ，Ｄ＝２１．７〜１２７ｍｍの範囲で、
（ｂ）増肉加工前の素材鋼管４の肉厚をｔ０とし、端部増肉鋼管の軸方向端部における増肉した部分の最大の肉厚をｔ１とした場合の増肉率{（ｔ１−ｔ０）／ｔ０}×１００（％）が５〜８０％の範囲で、
（ｃ）端部増肉鋼管の軸方向端部への増肉した部分の長さＬが５〜３００ｍｍの範囲で、
（ｄ）端部増肉鋼管の加工硬化係数（歪み硬化指数）ｎ値は０．０８〜０．３の範囲で、
（ｅ）端部増肉鋼管の深絞り性を表す特性値であるｒ値は０．６〜２．０の範囲で、
（ｆ）素材鋼管４の鋼種は、例えばＳＴＫＭ１３Ｂで
それぞれ、適用することができる。特に、ｎ値が小さすぎると座屈し易く、大き過ぎると加工硬化の程度が大きくなり押し力が過大になる。一方、ｒ値はしわ発生に影響し、高ければしわが発生し難い。
The present invention is, for example,
(A) Assuming that the thickness of the material steel pipe 4 before thickness increase processing is t 0 and the outer diameter is D, the ratio (t 0 / D) is in the range of 2 to 10% and t 0 = 1.0 In the range of ~ 5.0mm, D = 21.7 ~ 127mm,
(B) A thickness increase ratio in the case where the thickness of the material steel pipe 4 before the thickness increase processing is t 0 and the maximum thickness of the thickened portion at the axial end of the end thickness increase steel pipe is t 1 { (T 1 −t 0 ) / t 0 } × 100 (%) is in the range of 5 to 80%,
(C) End increased thickness The length L of the increased thickness to the axial end of the steel pipe is in the range of 5 to 300 mm,
(D) The work hardening coefficient (strain hardening index) n value of the end-thickened steel pipe is in the range of 0.08 to 0.3,
(E) The r value, which is a characteristic value representing the deep drawability of the end-wall-thickened steel pipe, is in the range of 0.6 to 2.0,
(F) The steel type of the material steel pipe 4 can be applied, for example, in STKM 13B. In particular, when the n value is too small, it tends to buckle, and when it is too large, the degree of work hardening becomes large and the pressing force becomes excessive. On the other hand, the r value affects the occurrence of wrinkles, and if it is high, wrinkles are less likely to occur.
金型２は、素材鋼管４の軸方向と平行な方向へ向けて非増肉部２ａおよび増肉部２ｂを並んで有する。非増肉部２ａは、素材鋼管４の外径Ｄと略同じ外径ｄ０を有することにより素材鋼管４を増肉させない。増肉部２ｂは、素材鋼管４の外径Ｄよりも大きな内径ｄ１（端部増肉鋼管の軸方向端部における増肉した部分の最大の外径Ｄ１と同じ値）を有することにより素材鋼管４を増肉させる。 The mold 2 has a non-thickened portion 2 a and a thickened portion 2 b side by side in a direction parallel to the axial direction of the material steel pipe 4. The non-thickened portion 2 a does not increase the thickness of the material steel pipe 4 by having an outer diameter d 0 substantially the same as the outer diameter D of the material steel pipe 4. The thickness-increasing portion 2 b has an inner diameter d 1 larger than the outer diameter D of the material steel pipe 4 (the same value as the maximum outer diameter D 1 of the portion of the end-thickened steel pipe in the axial direction). The material steel pipe 4 is increased.
すなわち、素材鋼管４のような管は、その軸方向へ圧縮されると膨らむ方向（外径が拡大する方向）へ変形するため、金型２は、管端部４ｃにおいて主に素材鋼管４の外側へ向けた膨出変形（増肉）を円滑に行うために、素材鋼管４の外部側に増肉部２ｂを有する。 That is, since a tube such as the material steel pipe 4 is deformed in the expanding direction (direction in which the outer diameter is expanded) when compressed in its axial direction, the mold 2 mainly forms the material steel pipe 4 at the pipe end 4c. In order to smoothly carry out an outward bulging deformation (thickening), a thickened portion 2 b is provided on the outer side of the material steel pipe 4.
金型２における増肉部２ｂの内径ｄ１と素材鋼管４の外径Ｄとの差は、素材鋼管４の軸方向へ、図１に示すように一定であってもあるいはテーパ状に変化してもよく、または段差状に変化してもよい。端部増肉鋼管の外形に応じて適宜設定すればよい。さらに、金型２が分割型である場合には増肉部２ｂに凹部や凸部が存在していてもよい。 Difference between the outer diameter D of the inner diameter d 1 and the material steel pipe 4 of thickened portion 2b of the die 2, the axial direction of the material steel pipe 4, also or changes in a tapered shape is constant as shown in FIG. 1 Or it may change in a step-like manner. It may be appropriately set in accordance with the outer shape of the end-portion-thickened steel pipe. Furthermore, when the mold 2 is a split mold, a concave portion or a convex portion may exist in the thickness increasing portion 2b.
軸押しパンチ３は、本体３ａおよび芯金３ｂを有する。本体３ａは、金型２における増肉部２ｂの内径ｄ１と略同じ外径ｄ２を有する。芯金３ｂは、本体３ａに素材鋼管４の軸方向へ向けて延びて設けられる。 The shaft pressing punch 3 has a main body 3a and a core 3b. The main body 3 a has an outer diameter d 2 substantially the same as the inner diameter d 1 of the thickness increasing portion 2 b of the mold 2. The core metal 3 b is provided on the main body 3 a so as to extend in the axial direction of the material steel pipe 4.
軸押しパンチ３は、冷間で素材鋼管４の端面４ｄを素材鋼管４の軸方向へ押し込むことにより、素材鋼管４の肉厚ｔ０よりも軸方向端部の肉厚が増加した端部増肉鋼管を製造する。 The axial pressing punch 3 is cold and pushes the end face 4 d of the material steel pipe 4 in the axial direction of the material steel pipe 4 to increase the thickness of the axial direction end more than the thickness t 0 of the material steel pipe 4. Manufactures meat and steel pipes.
素材鋼管４の軸方向への芯金３ｂの長さＬは、軸方向への増肉部２ｂの長さＬ１よりも長い。これにより、素材鋼管４にしわや座屈が発生することを防止できる。 The length L of the metal core 3b in the axial direction of the material steel pipe 4 is longer than the length L1 of the thickened portion 2b in the axial direction. Thereby, it is possible to prevent the occurrence of wrinkles and buckling in the material steel pipe 4.
芯金３ｂの外径ｄ４は、素材鋼管４の内径ｄ３よりも小さい。すなわち、芯金３ｂと素材鋼管４との間には長さ（ｄ３−ｄ４）のクリアランスがあり、これにより、素材鋼管４の内面側で芯金３を押してしまうことを防止できる。このクリアランス、すなわち、素材鋼管４の内径ｄ３と芯金３ｂの外径ｄ４との差は、金型２における増肉部２ｂの内径ｄ１と素材鋼管４の外径Ｄとの差の２０〜４０％であることが望ましい。これにより、素材鋼管４を座屈させないとともに、押し込まないようにすることができる。 The outer diameter d 4 of the core 3 b is smaller than the inner diameter d 3 of the material steel pipe 4. That is, there is a clearance (d 3 -d 4 ) of a length (d 3 -d 4 ) between the core metal 3 b and the material steel pipe 4, which can prevent the core metal 3 from being pushed on the inner surface side of the material steel pipe 4. This clearance, i.e., the difference between the outer diameter d 4 of the inner diameter d 3 and the core 3b of the material steel pipe 4, the difference between the inner diameter d 1 and an outer diameter D of the material steel pipe 4 of the thickened portion 2b of the die 2 It is desirable that it is 20 to 40%. As a result, it is possible to prevent the material steel pipe 4 from being buckled and not to be pressed.
芯金３ｂの先端角部３ｂ−１は面取り部またはテーパ形状部であることが望ましい。これにより、芯金３ｂの先端で素材鋼管４を押し込むことを防止できる。 It is desirable that the end corner 3b-1 of the core 3b be a chamfered portion or a tapered portion. As a result, it is possible to prevent the material steel pipe 4 from being pushed in with the end of the core 3b.
製造装置１は以上のように構成される。次に、製造装置１を用いる端部増肉鋼管の製造方法を説明する。 The manufacturing apparatus 1 is configured as described above. Next, a method of manufacturing an end portion-thickened steel pipe using the manufacturing apparatus 1 will be described.
２．製造方法
製造装置１を用い、金型２の内部に固定して配置された素材鋼管４の端面４ｄを、軸押しパンチ３により素材鋼管４の軸方向へ押し込む。
2. Manufacturing Method Using the manufacturing apparatus 1, the end face 4 d of the raw steel pipe 4 fixed and disposed inside the mold 2 is pushed in the axial direction of the raw steel pipe 4 by the axial pressing punch 3.
鋼管４のような管は、その軸方向へ圧縮されると膨らむ方向へ変形するため、素材鋼管４は、金型２の増肉部２ｂの側へ増肉する。 Since the pipe such as the steel pipe 4 is deformed in the expanding direction when compressed in the axial direction, the material steel pipe 4 is increased in thickness toward the thickened portion 2 b of the mold 2.
また、製造装置１では、素材鋼管４の軸方向への芯金３ｂの長さＬ１が軸方向への増肉部２ｂの長さＬ１よりも長く設定されているため、軸押し時の素材鋼管４にしわや座屈が発生することが防止される。 Further, in the manufacturing apparatus 1, since the length L1 of the core 3b in the axial direction of the material steel pipe 4 is set longer than the length L1 of the thickened portion 2b in the axial direction, the material steel pipe at the time of axial pressing Wrinkles and buckling on 4 are prevented.
芯金３ｂの外径ｄ４は素材鋼管４の内径ｄ３よりも小さく、芯金３ｂと素材鋼管４との間にはクリアランスが設けられているため、素材鋼管４の内面側で芯金３を押してしまうことが防止され、素材鋼管４を座屈させないとともに、押し込まないようにすることができる。 The outer diameter d 4 of the core 3 b is smaller than the inner diameter d 3 of the material steel pipe 4, and a clearance is provided between the metal core 3 b and the material steel pipe 4. Can be prevented, and the material steel pipe 4 can be prevented from being buckled and not pushed.
さらに、芯金３ｂの先端角部３ｂ−１が面取り部またはテーパ形状部である場合には、芯金３ｂの先端で素材鋼管４を押し込むことが防止される。 Furthermore, in the case where the front end corner 3b-1 of the core 3b is a chamfered portion or a tapered portion, it is possible to prevent the material steel pipe 4 from being pushed in by the tip of the core 3b.
このようにして、製造装置１を用いて、端面の近傍の素材鋼管４を金型２の増肉部２ｂへ向けて増肉させることによって、素材鋼管４の肉厚ｔ０よりも軸方向端部の肉厚が増加した端部増肉鋼管を簡易に製造することができる。 Thus, by using the manufacturing apparatus 1 to increase the thickness of the material steel pipe 4 in the vicinity of the end face toward the thickened portion 2 b of the mold 2, the axial direction end of the material steel pipe 4 is greater than the thickness t 0 of the material steel pipe 4 It is possible to easily manufacture an end-thickened steel pipe with an increased wall thickness of the part.
図２，３は、いずれも、実施例の解析条件を説明するための半断面図である。
図２，３に示す解析条件（ソルバー：ＡＢＡＱＵＳ、軸対象モデル、メッシュサイズ０．４ｍｍ、素材鋼管４と本体３ａとの摩擦係数μ＝０．０、これ以外の摩擦係数μ＝０．１５）で、素材鋼管（外径５０．８ｍｍ，肉厚１．６ｍｍ，引張強度４４０ＭＰａ相当）に管端増肉加工を行って、管端部の肉厚が２．０ｍｍである管端増肉鋼管５を製造する解析を行った。この解析では、管端増肉鋼管５の増肉部の軸方向への長さＬは、２０，１００，２００ｍｍの３水準とした。
2 and 3 are both half sectional views for explaining the analysis conditions of the embodiment.
Analysis conditions shown in FIGS. 2 and 3 (solver: ABAQUS, axis target model, mesh size 0.4 mm, coefficient of friction μ between the material steel pipe 4 and the main body 3 a = 0.0, other coefficients of friction μ = 0.15) Then, the end of the tube is processed to increase the thickness of the material end (50.8 mm outer diameter, 1.6 mm thickness, equivalent to 440 MPa tensile strength), and the thickness of the end of the tube is 2.0 mm. An analysis was performed to produce In this analysis, the axial length L of the thickness-increasing portion of the pipe end thickness-increasing steel pipe 5 is set to three levels of 20, 100, and 200 mm.
その結果、端部増肉鋼管５における増肉部の長さＬが２０ｍｍ，１００ｍｍ，２００ｍｍにおいて、本発明によれば、外径５０．８ｍｍ，肉厚１．６ｍｍの素材鋼管４に軸押し加工を行って、管端部の外径５１．６ｍｍ，肉厚３．２ｍｍの端部増肉鋼管５を製造できることが確認された。 As a result, according to the present invention, axial pressing of the material steel pipe 4 having an outer diameter of 50.8 mm and a thickness of 1.6 mm is carried out according to the present invention when the length L of the thickened portion in the end-thickened steel pipe 5 is 20 mm, 100 mm, It was confirmed that an end-thickened steel pipe 5 having an outer diameter of 51.6 mm and a wall thickness of 3.2 mm could be manufactured.
１ 製造装置
２ 金型
２ａ 非増肉部
２ｂ 増肉部
３ 軸押しパンチ
３ａ 本体
３ｂ 芯金
４ 素材鋼管
５ 端部増肉鋼管
Reference Signs List 1 manufacturing apparatus 2 mold 2a non-thickened portion 2b thickened portion 3 axial pushing punch 3a main body 3b cored bar 4 material steel pipe 5 end thickened steel pipe
Claims (5)
前記金型は、前記素材鋼管の外径と略同じ外径を有することにより前記素材鋼管を増肉させない非増肉部と、前記素材鋼管の外径よりも大きな内径を有することにより前記素材鋼管を前記素材鋼管の外側へ増肉させる増肉部とを有すること、
前記軸押しパンチは、前記金型における前記増肉部の内径と略同じ外径を有する本体と、該本体に前記素材鋼管の軸方向へ向けて延びて設けられる芯金とを有する
パンチを用いること、
前記素材鋼管は、該素材鋼管の軸方向について前記金型に対して相対的に固定されること、
前記素材鋼管の軸方向への前記芯金の長さは、該軸方向への前記増肉部の長さよりも長いこと、および
前記軸押しパンチによる前記素材鋼管の軸押し動作開始時点には前記芯金と前記素材鋼管との間に全周に亘ってクリアランスを形成するために、且つ、前記軸押しパンチによる前記素材鋼管の軸押し動作の最中には前記素材鋼管を前記芯金とは反対側へ向かう方向としての前記増肉部側へ向けて増肉するために、前記芯金の外径が前記素材鋼管の内径よりも小さくされていること
を特徴とする端部増肉鋼管の製造装置。 A mold for disposing a material steel pipe inside, and an end part in which the thickness of the axial end is increased more than the thickness of the material steel pipe by pressing the end face of the material steel pipe in the axial direction of the material steel pipe coldly. Equipped with a shaft-pushing punch that produces a thick-walled steel pipe,
The metal mold has a non-thickened portion that does not increase the thickness of the material steel pipe by having an outer diameter substantially the same as the outer diameter of the material steel pipe, and the material steel pipe by having an inner diameter larger than the outer diameter of the material steel pipe. And an increase in thickness of the material steel pipe .
The axial pressing punch uses a punch having a main body having an outer diameter substantially the same as the inner diameter of the thickened portion in the mold and a cored bar extending in the axial direction of the material steel pipe on the main body. about,
The material steel pipe is fixed relative to the mold in the axial direction of the material steel pipe,
The length of the core metal in the axial direction of the material steel pipe is longer than the length of the thickened portion in the axial direction, and the axial pressing operation of the material steel pipe by the axial pressing punch is started. In order to form a clearance over the entire circumference between the core metal and the material steel pipe, and in the middle of the axial pushing operation of the material steel pipe by the axial pushing punch, the material steel pipe is the core metal The outer diameter of the core is made smaller than the inner diameter of the material steel pipe in order to increase the thickness toward the thickness increasing portion as the direction toward the opposite side, manufacturing device.
前記素材鋼管の外径との差の２０〜４０％であることを特徴とする請求項１に記載された
端部増肉鋼管の製造装置。 The difference between the inside diameter of the material steel pipe and the outside diameter of the core metal is 20 to 40% of the difference between the inside diameter of the thickened portion of the mold and the outside diameter of the material steel pipe. An apparatus for manufacturing the end-thickened steel pipe described in Item 1.
方向へ、一定であること、テーパ状に変化すること、または段差状に変化することを特徴
とする請求項１または請求項２に記載された端部増肉鋼管の製造装置。 The difference between the inner diameter of the thickened portion in the mold and the outer diameter of the material steel pipe is constant in the axial direction of the material steel pipe, changes in a tapered shape, or changes in a step shape. The apparatus for producing an end-wall-thickened steel pipe according to claim 1 or 2, characterized in that:
ら請求項３までのいずれか１項に記載された端部増肉鋼管の製造装置。 The apparatus for manufacturing an end-wall-thickened steel pipe according to any one of claims 1 to 3, wherein a tip corner of the cored bar is a chamfered part or a tapered part.
部に配置された素材鋼管の端面を、前記軸押しパンチにより前記素材鋼管の軸方向へ押し
込むことにより、前記端面の近傍の前記素材鋼管を前記金型の前記増肉部へ向けて増肉さ
せることによって、前記素材鋼管の肉厚よりも軸方向端部の肉厚が増加した端部増肉鋼管
を製造することを特徴とする端部増肉鋼管の製造方法。 The end face of the material steel pipe disposed inside the mold is pushed in the axial direction of the material steel pipe by the axial pressing punch using the manufacturing apparatus according to any one of claims 1 to 4 Thus, by increasing the thickness of the material steel pipe in the vicinity of the end face toward the thickness-increasing part of the mold, the thickness of the end in the axial direction is increased more than the thickness of the material steel pipe. A method for producing an end-thickened steel pipe characterized by producing a steel pipe.
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| DE2812803C2 (en) * | 1978-03-23 | 1982-11-18 | Laeis-Werke Ag, 5500 Trier | Device for upsetting pipe ends, in particular for drill rod pipes with welding neck connectors |
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