JP2006110567A - Partially thin-walled pipe manufacturing method - Google Patents

Partially thin-walled pipe manufacturing method Download PDF

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JP2006110567A
JP2006110567A JP2004298064A JP2004298064A JP2006110567A JP 2006110567 A JP2006110567 A JP 2006110567A JP 2004298064 A JP2004298064 A JP 2004298064A JP 2004298064 A JP2004298064 A JP 2004298064A JP 2006110567 A JP2006110567 A JP 2006110567A
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pipe material
pipe
punch
die
thin
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JP4565960B2 (en
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Yutaka Tada
豊 多田
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Bestex Kyoei Co Ltd
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Bestex Kyoei Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a partially thin-walled pipe manufacturing method capable of partially reducing the wall thickness of a pipe and arbitrarily setting the wall thickness and the range of a thin-walled portion of the pipe. <P>SOLUTION: The pipe manufacturing method for manufacturing a partially thin-walled pipe of the same diameter by partially reducing the wall thickness of a pipe W comprises a die positioning step 1 of fitting a die 6 to one end of the pipe W and positioning it at an arbitrary position, a punch press-fitting step 2 of press-fitting a punch 7 from the other end of the pipe W and expanding the inside diameter of the pipe W to the press-fitting setting position, and a drawing step 3 of drawing the pipe W while fixing the positional relationship between the punch 7 and the die 6. The range of a thin-walled part Wa can be arbitrarily set by setting the press-fitting setting position (the position at an arbitrary distance L<SB>1</SB>from one end of the pipe W), and the wall thickness of the thin-walled part Wa can be arbitrarily set by setting the inside diameter D of the die 6 and the outside diameter D<SB>2</SB>of the punch 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、パイプ材の肉厚を部分的に薄肉化して同径又は異径の部分的薄肉パイプを製造する方法に関する。   The present invention relates to a method of manufacturing a partially thin pipe having the same or different diameter by partially reducing the thickness of a pipe material.

自動車部品のパイプ構造物において、強度が必要とされる部位のパイプ構造部品では、部分的に加わる最大荷重値によりパイプの材質、外径、肉厚が決定される。つまり必要以上に厚肉の部分も生じている。つまり、パイプ材を骨格材料とする自動車部品では、最大荷重入力点のみに、材質、外径、肉厚が要求され、その他の部位については一般的に強度、剛性を下げることが可能である。また、衝突エネルギー吸収部位に用いるパイプ構造部品では、一定断面のパイプ材だと変形開始エネルギー及び変形開始部位の安定化が図り難い。   In a pipe structure part of an automobile part where the strength is required, the material, outer diameter, and thickness of the pipe are determined by the maximum load value applied partially. In other words, an unnecessarily thick part is generated. That is, in an automobile part that uses a pipe material as a skeleton material, the material, the outer diameter, and the wall thickness are required only at the maximum load input point, and the strength and rigidity can generally be lowered for other parts. Moreover, in the pipe structure component used for the collision energy absorption site, it is difficult to stabilize the deformation start energy and the deformation start site if the pipe material has a constant cross section.

そこで、外周面にパイプ材に対する薄肉加工形状が形成された心棒をパイプ材に挿入し、次いでこの心棒を挿入したパイプ材をダイスに圧入通過させ、次いでパイプ材から心棒を引き抜くことにより、パイプ材の肉厚を部分的に薄肉化する方法が知られている（特許文献１）。   Therefore, a pipe material is inserted by inserting a mandrel having a thin-wall processed shape formed on the outer peripheral surface into the pipe material, then press-fitting the pipe material into which the mandrel is inserted into a die, and then withdrawing the mandrel from the pipe material. There is known a method of partially reducing the wall thickness of the film (Patent Document 1).

米国特許第４６１６５００号明細書US Pat. No. 4,616,500

しかし、特許文献１に記載されたパイプ材の薄肉化方法においては、パイプ材の薄肉位置や薄肉形状が心棒の外周面形状によって決定され、任意の部位を薄肉にしたり、肉厚を任意に設定したりすることができず、汎用性がないという問題がある。   However, in the pipe material thinning method described in Patent Literature 1, the thin wall position and the thin wall shape of the pipe material are determined by the outer peripheral surface shape of the mandrel, and an arbitrary part is thinned or the wall thickness is arbitrarily set There is a problem in that it cannot be used.

また、パイプ材の外周にダイスを外嵌し、パイプ材の内側にプラグを挿入し、ダイスとプラグの間でパイプ材をしごき加工して薄肉部を形成することも考えられるが、出発材料のパイプ材の外径が縮径されてしまうので、用途が限定されてしまう。   It is also conceivable to insert a die on the outer periphery of the pipe material, insert a plug inside the pipe material, and squeeze the pipe material between the die and the plug to form a thin wall portion. Since the outer diameter of the pipe material is reduced, the use is limited.

本発明は、従来の技術が有するこのような問題点に鑑みてなされたものであり、その目的とするところは、パイプ材の肉厚を部分的に薄肉化することができると共に、パイプ材の薄肉部の肉厚、薄肉部の範囲を任意に設定することができる部分的薄肉パイプの製造方法を提供しようとするものである。   The present invention has been made in view of such problems of the prior art, and the object of the present invention is to reduce the thickness of the pipe material partially and to reduce the thickness of the pipe material. It is an object of the present invention to provide a method for manufacturing a partially thin pipe, in which the thickness of the thin portion and the range of the thin portion can be arbitrarily set.

上記課題を解決すべく請求項１に係る発明は、外径が同径の部分的薄肉パイプを製造する方法であって、パイプ材の外径に略等しい内径のダイスを前記パイプ材の一端に外嵌してダイスをパイプ材に沿って所定位置まで相対的に移動して位置決めするダイス位置決め工程と、このダイス位置決め工程に引き続いてポンチを前記パイプ材の他端から所定位置まで前記パイプ材の外径を拡大しつつ圧入するポンチ圧入工程と、このポンチ圧入工程に引き続いて前記ポンチと前記ダイスの位置関係を固定した状態で前記パイプ材を引き抜く引抜工程とからなる。   In order to solve the above problem, the invention according to claim 1 is a method of manufacturing a partially thin pipe having the same outer diameter, and a die having an inner diameter substantially equal to the outer diameter of the pipe material is provided at one end of the pipe material. A die positioning step in which the die is relatively moved and positioned along a pipe material to a predetermined position, and a punch is moved from the other end of the pipe material to a predetermined position following the die positioning step. It comprises a punch press-in process for press-in while expanding the outer diameter, and a pull-out process for pulling out the pipe material in a state where the positional relationship between the punch and the die is fixed following the punch press-in process.

請求項２に係る発明は、外径が同径の部分的薄肉パイプを製造する方法であって、パイプ材の外径に略等しい内径のダイスを前記パイプ材の一端に外嵌してダイスをパイプ材に沿って所定位置まで相対的に移動して位置決めするダイス位置決め工程と、このダイス位置決め工程に引き続いてポンチを前記パイプ材の他端から所定位置まで前記パイプ材の外径を拡大しつつ圧入するポンチ圧入工程と、このポンチ圧入工程に引き続いて前記ポンチと前記ダイスの位置関係を固定した状態で前記パイプ材を引抜設定位置まで引き抜く第１引抜工程と、前記パイプ材と前記ダイスを固定した状態で前記ポンチを引き抜くポンチ引抜工程と、前記パイプ材又は前記ダイスを引き抜く第２引抜工程からなる。   The invention according to claim 2 is a method of manufacturing a partially thin pipe having the same outer diameter, and a die having an inner diameter substantially equal to the outer diameter of the pipe material is externally fitted to one end of the pipe material. A die positioning step of relatively moving to a predetermined position along the pipe material and positioning the punch from the other end of the pipe material to a predetermined position following the die positioning step while expanding the outer diameter of the pipe material A punch press-fitting step for press-fitting, a first pulling step for pulling the pipe material to a pull-out setting position in a state where the positional relationship between the punch and the die is fixed following the punch press-fitting step, and fixing the pipe material and the die The punching process of pulling out the punch in this state and the second drawing process of pulling out the pipe material or the die.

請求項３に係る発明は、外径が異径の部分的薄肉パイプを製造する方法であって、ポンチを前記パイプ材に縮径長さ以上まで前記パイプ材の一端から挿入するポンチ挿入工程と、前記パイプ材の一端に嵌合させたダイスを移動して前記パイプ材を前記縮径長さだけ縮径する縮径工程と、前記ポンチを移動して前記パイプ材を介して前記ダイスに押し当てるポンチ押当工程と、前記ポンチと前記ダイスの位置関係を固定した状態で前記パイプ材を引き抜く引抜工程からなる。   The invention according to claim 3 is a method for manufacturing a partially thin pipe having different outer diameters, wherein a punch is inserted into the pipe material from one end of the pipe material up to a reduced diameter length or more. A diameter reduction step of moving the die fitted to one end of the pipe material to reduce the pipe material by the reduced diameter length, and moving the punch to push the die through the pipe material. It comprises a punch pressing step for contact, and a drawing step for pulling out the pipe material in a state where the positional relationship between the punch and the die is fixed.

請求項４に係る発明は、請求項１又は３記載の部分的薄肉パイプの製造方法において、前記引抜工程を、前記パイプ材を固定した状態で、前記ポンチと前記ダイスを移動して前記パイプ材から離脱するようにした。   The invention according to claim 4 is the method of manufacturing a partially thin pipe according to claim 1 or 3, wherein in the drawing step, the pipe material is moved by moving the punch and the die while the pipe material is fixed. I was leaving.

本発明によれば、パイプ材の肉厚を部分的に薄肉化することができると共に、パイプ材の薄肉部の肉厚、薄肉部の範囲を任意に設定することができるので、汎用性が向上する。特に製品となるパイプの外径と出発材料のパイプの外径が等しいため、成形が無理なく効率よく行われる。   According to the present invention, the thickness of the pipe material can be partially reduced, and the thickness of the thin part of the pipe material and the range of the thin part can be arbitrarily set, so versatility is improved. To do. In particular, since the outer diameter of the product pipe is equal to the outer diameter of the starting material pipe, molding can be performed efficiently without difficulty.

また、外径が同径で片端が薄肉のパイプ、外径が同径で部分的に薄肉のパイプや外径が異径で薄肉のパイプなどを容易に製造することができ、強度剛性の不必要部分については、要求される最低強度まで部分的に薄肉化が可能になるため、パイプ構造物としての軽量化・コスト低減が図れる。   In addition, pipes with the same outer diameter and one end, thin pipes, pipes with the same outer diameter and partially thin walls, and pipes with different outer diameters and thin walls can be easily manufactured. Since the required portion can be partially thinned to the required minimum strength, the weight and cost of the pipe structure can be reduced.

以下に本発明の実施の形態を添付図面に基づいて説明する。ここで、図１は本発明に係る部分的薄肉パイプの製造方法の第１実施の形態の説明図、図２は同径片端薄肉パイプの断面図、図３は第２実施の形態の説明図、図４は同径部分的薄肉パイプの断面図、図５は第３実施の形態の説明図、図６は異径薄肉パイプの断面図である。   Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is an explanatory view of a first embodiment of a method for manufacturing a partially thin pipe according to the present invention, FIG. 2 is a cross-sectional view of the same-diameter one-end thin pipe, and FIG. 3 is an explanatory view of the second embodiment. 4 is a cross-sectional view of a partially thin pipe having the same diameter, FIG. 5 is an explanatory view of a third embodiment, and FIG. 6 is a cross-sectional view of a thin pipe having a different diameter.

本発明に係る部分的薄肉パイプの製造方法の第１実施の形態は、図１に示すように、ダイス位置決め工程１、ポンチ圧入工程２、ポンチ引抜工程３からなる。   The first embodiment of the method for manufacturing a partially thin pipe according to the present invention comprises a die positioning step 1, a punch press-in step 2, and a punch drawing step 3, as shown in FIG.

先ず、ダイス位置決め工程１において、図１（ａ）に示すように、外径がＤで内径がＤ１のパイプ材Ｗの一端から、内径がパイプ材Ｗの外径Ｄとほぼ同じダイス６を嵌合する。更に、全長がＬのパイプ材Ｗに対して、一端から任意の距離Ｌ１の位置でダイス６を位置決め固定する。なお、パイプ材Ｗの肉厚は、Ｔ（Ｄ−Ｄ１）である。 First, in the die positioning step 1, as shown in FIG. 1 (a), from one end of the pipe W having an inner diameter of the outer diameter at D is D 1, an inner diameter of the outer diameter D of the pipe W substantially the same die 6 Mating. Further, total length with respect to the pipe material W of L, positioning and fixing the die 6 at the position of an arbitrary distance L 1 from one end. The wall thickness of the pipe material W is T (D−D 1 ).

次いで、ポンチ圧入工程２において、図１（ｂ）に示すように、外径がＤ２のポンチ７をパイプ材Ｗの他端から圧入して、パイプ材Ｗの内径をダイス６に向かってＤ１からＤ２に拡げるとともにパイプ材Ｗの外径もＤ０まで拡げる。そして、ポンチ７をダイス６が位置決め固定されている任意の圧入設定位置（パイプ材Ｗの一端から任意の距離Ｌ１の位置）で停止させる。 Then, the punch press-fitting step 2, as shown in FIG. 1 (b), the outer diameter is press-fitted punch 7 of D 2 from the other end of the pipe W, toward the inner diameter of the pipe W to the die 6 D the outer diameter of the pipe material W with expanded from 1 to D 2 also expand to D 0. Then, the punch 7 is stopped at an arbitrary press-fit setting position (position of an arbitrary distance L 1 from one end of the pipe material W) where the die 6 is positioned and fixed.

次いで、引抜工程３において、図１（ｃ）に示すように、ポンチ７とダイス６の位置関係を固定した状態で、パイプ材Ｗをポンチ７の前進方向に引き抜く。また、引抜工程３において、パイプ材Ｗを固定した状態で、ポンチ７とダイス６をポンチ７の後退方向に移動させてパイプ材Ｗから離脱させてもよい。   Next, in the drawing step 3, as shown in FIG. 1C, the pipe material W is drawn in the forward direction of the punch 7 with the positional relationship between the punch 7 and the die 6 fixed. Further, in the drawing step 3, the punch 7 and the die 6 may be moved away from the pipe material W by moving the punch 7 and the die 6 in the retracting direction of the punch 7 while the pipe material W is fixed.

すると、図２に示すように、外径がＤ、薄肉部Ｗａの長さが（Ｌ−Ｌ１）、薄肉部Ｗａの肉厚がＴ１（Ｄ−Ｄ２）である外径が同径で片端が薄肉のパイプ８が形成される。 Then, as shown in FIG. 2, the outer diameter is D, the length of the thin portion Wa is (L-L 1 ), and the thickness of the thin portion Wa is T 1 (DD 2 ). Thus, a pipe 8 having a thin wall at one end is formed.

このように、薄肉部Ｗａの範囲（Ｌ−Ｌ１）は、圧入設定位置（パイプ材Ｗの一端から任意の距離Ｌ１の位置）を設定することにより任意に設定することができ、薄肉部Ｗａの肉厚Ｔ１（Ｄ−Ｄ２）は、ダイス６の内径Ｄとポンチ７の外径Ｄ２を設定することにより任意に設定することができる。なお、薄肉部Ｗａの肉厚Ｔ１はパイプ材Ｗの肉厚Ｔの半分位までにすることができる。 Thus, the scope of the thin portion Wa (L-L 1) can be set arbitrarily by setting the press-setting position (from one end of the arbitrary distance L 1 position of the pipe W), the thin portion Wa thickness T 1 (D-D 2 ) can be arbitrarily set by setting the inner diameter D of the die 6 and the outer diameter D 2 of the punch 7. Note that the thickness T 1 of the thin wall portion Wa can be up to about half the thickness T of the pipe material W.

次に、本発明に係る部分的薄肉パイプの製造方法の第２実施の形態は、図３に示すように、ダイス位置決め工程１１、ポンチ圧入工程１２、第１引抜工程１３、ポンチ引抜工程１４、第２引抜工程１５からなる。   Next, as shown in FIG. 3, the second embodiment of the method for manufacturing a partially thin pipe according to the present invention includes a die positioning step 11, a punch press-in step 12, a first drawing step 13, a punch drawing step 14, It consists of a second drawing step 15.

先ず、ダイス位置決め工程１１において、図３（ａ）に示すように、外径がＤで内径がＤ１のパイプ材Ｗの一端から、内径がパイプ材Ｗの外径とほぼ同じＤのダイス６を嵌合する。更に、全長がＬのパイプ材Ｗに対して、一端から任意の位置Ｌ１でダイス６を位置決め固定する。なお、パイプ材Ｗの肉厚は、Ｔ（Ｄ−Ｄ１）である。 First, in the die positioning step 11, as shown in FIG. 3A, a die 6 having an inner diameter D substantially the same as the outer diameter of the pipe material W from one end of the pipe material W having an outer diameter D and an inner diameter D 1. Mating. Further, total length with respect to the pipe material W of L, positioning and fixing the die 6 at an arbitrary position L 1 from one end. The wall thickness of the pipe material W is T (D−D 1 ).

次いで、ポンチ圧入工程１２において、図３（ｂ）に示すように、外径がＤ２のポンチ７をパイプ材Ｗの他端から圧入して、パイプ材Ｗの内径をダイス６に向かってＤ１からＤ２に拡げていく。そして、ポンチ７をダイス６が位置決め固定されている任意の圧入設定位置（パイプ材Ｗの一端から任意の距離Ｌ１の位置）で停止させる。 Next, in the punch press-fitting step 12, as shown in FIG. 3B, the punch 7 having an outer diameter D 2 is press-fitted from the other end of the pipe material W, and the inner diameter of the pipe material W is increased toward the die 6. It will spread to the D 2 from 1. Then, the punch 7 is stopped at an arbitrary press-fit setting position (position of an arbitrary distance L 1 from one end of the pipe material W) where the die 6 is positioned and fixed.

次いで、第１引抜工程１３において、図３（ｃ）に示すように、ポンチ７とダイス６の位置関係を固定した状態で、パイプ材Ｗを引抜設定位置（パイプ材Ｗの一端から任意の距離Ｌ２の位置）までポンチ７の前進方向に引き抜く。すると、長さが（Ｌ２−Ｌ１）の薄肉部Ｗａが形成される Next, in the first drawing step 13, as shown in FIG. 3C, the pipe material W is set at the drawing set position (an arbitrary distance from one end of the pipe material W while the positional relationship between the punch 7 and the die 6 is fixed. L 2 position) pulled out in the forward direction of the punch 7 to. As a result, a thin portion Wa having a length of (L 2 -L 1 ) is formed.

次いで、ポンチ引抜工程１４において、図３（ｄ）に示すように、パイプ材Ｗとダイス６を固定した状態で、ポンチ７を後退させてパイプ材Ｗから引き抜く。     Next, in the punch drawing process 14, as shown in FIG. 3D, the punch 7 is retracted and pulled out from the pipe material W while the pipe material W and the die 6 are fixed.

更に、第２引抜工程１５において、図３（ｅ）に示すように、ダイス６を固定した状態で、パイプ材Ｗをポンチ７の前進方向に引き抜く。すると、パイプ材Ｗのうち薄肉部Ｗａではないがポンチ７により内径がＤ１からＤ２に拡げられた部分は、ポンチ７とダイス６によるしごき加工がないため、ダイス６により内径が縮径され、外径がＤで内径がＤ１になる。 Further, in the second drawing step 15, as shown in FIG. 3E, the pipe material W is drawn in the forward direction of the punch 7 with the die 6 fixed. Then, the portion of the pipe material W that is not the thin-walled portion Wa but whose inner diameter is expanded from D 1 to D 2 by the punch 7 is not ironed by the punch 7 and the die 6, so the inner diameter is reduced by the die 6. an outer diameter of an inner diameter is D 1 with D.

すると、図４に示すように、外径がＤ、薄肉部Ｗａの長さが（Ｌ２−Ｌ１）、薄肉部Ｗａの肉厚がＴ１（Ｄ−Ｄ２）である同径部分的薄肉パイプ１８が形成される。なお、ポンチ引抜工程１４において、パイプ材Ｗを固定した状態で、ダイス６をポンチ７の後退方向に移動させてパイプ材Ｗから離脱させてもよい。 Then, as shown in FIG. 4, the outer diameter is D, the length of the thin portion Wa is (L 2 -L 1 ), and the thickness of the thin portion Wa is T 1 (DD 2 ). A thin pipe 18 is formed. In the punch drawing process 14, the die 6 may be moved away from the pipe material W by moving the die 6 in the retracting direction of the punch 7 while the pipe material W is fixed.

このように、薄肉部Ｗａの範囲（Ｌ２−Ｌ１）及びその位置は、圧入設定位置（パイプ材Ｗの一端から任意の距離Ｌ１の位置）と引抜設定位置（パイプ材Ｗの一端から任意の距離Ｌ２の位置）を設定することにより任意に設定することができ、薄肉部Ｗａの肉厚Ｔ１（Ｄ−Ｄ２）は、ダイス６の内径Ｄとポンチ７の外径Ｄ２を設定することにより任意に設定することができる。なお、薄肉部Ｗａの肉厚Ｔ１はパイプ材Ｗの肉厚Ｔの半分位までにすることができる。 Thus, the range (L 2 -L 1 ) and the position of the thin wall portion Wa are the press-fit setting position (position at an arbitrary distance L 1 from one end of the pipe material W) and the drawing setting position (from one end of the pipe material W). The position T of the thin portion Wa can be arbitrarily set by setting the position of the arbitrary distance L 2 ), and the thickness T 1 (D−D 2 ) of the thin portion Wa is equal to the inner diameter D of the die 6 and the outer diameter D 2 of the punch 7. It can be set arbitrarily by setting. Note that the thickness T 1 of the thin wall portion Wa can be up to about half the thickness T of the pipe material W.

次に、本発明に係る部分的薄肉パイプの製造方法の第３実施の形態は、図５に示すように、ポンチ挿入工程２１、縮径工程２２、ポンチ押当工程２３、引抜工程２４からなる。   Next, the third embodiment of the method for producing a partially thin pipe according to the present invention comprises a punch insertion step 21, a diameter reduction step 22, a punch pressing step 23, and a drawing step 24 as shown in FIG. .

先ず、ポンチ挿入工程２１において、図５（ａ）に示すように、外径がＤ３のポンチ２７を外径がＤで内径がＤ１のパイプ材Ｗに縮径長さ（パイプ材Ｗの一端から任意の距離）Ｌ３以上までパイプ材Ｗの一端から挿入する。
次いで、縮径工程２２において、図５（ｂ）に示すように、パイプ材Ｗの一端に嵌合させた内径がＤ４のダイス２６をポンチ２７の前進方向に移動させてパイプ材Ｗを縮径長さＬ３だけ縮径する。 First, in the punch inserting step 21, as shown in FIG. 5 (a), the outer diameter of the inner diameter of the punch 27 of D 3 outside diameter at D necked length in pipe W of D 1 (the pipe material W to any distance) L 3 or more from one end to insert from one end of the pipe material W.
Next, in the diameter reducing step 22, as shown in FIG. 5B, the pipe material W is reduced by moving the die 26 having an inner diameter D 4 fitted to one end of the pipe material W in the forward direction of the punch 27. only reducing the diameter diameter length of L 3.

次いで、ポンチ押当工程２３において、図５（ｃ）に示すように、ポンチ２７を後退方向に移動させてパイプ材Ｗを介してパイプ材Ｗの一端から任意の距離（縮径長さ）Ｌ３に位置するダイス２６に押し当てる。 Next, in the punch pressing step 23, as shown in FIG. 5C, the punch 27 is moved in the backward direction, and an arbitrary distance (reduced length) L from one end of the pipe material W through the pipe material W. Press against the die 26 located at 3 .

更に、引抜工程２４において、図５（ｄ）に示すように、ポンチ２７とダイス２６の位置関係を固定した状態で、パイプ材Ｗをポンチ２７の前進方向に引き抜く。また、引抜工程２４において、パイプ材Ｗを固定した状態で、ポンチ２７とダイス２６をポンチ２７の後退方向に移動させてパイプ材Ｗから離脱させてもよい。   Further, in the drawing step 24, as shown in FIG. 5D, the pipe material W is drawn in the forward direction of the punch 27 in a state where the positional relationship between the punch 27 and the die 26 is fixed. Further, in the drawing step 24, the punch 27 and the die 26 may be moved away from the pipe material W by moving the punch 27 and the die 26 in the retracting direction of the punch 27 while the pipe material W is fixed.

すると、図６に示すように、外径がＤで内径がＤ１である大径部と、長さがＬ３で肉厚がＴ２（Ｄ４−Ｄ３）である小径の薄肉部Ｗａからなる異径薄肉パイプ２８が形成される。 Then, as shown in FIG. 6, the small diameter wall thickness and a large diameter portion whose inner diameter outer diameter at D is a D 1, a length L 3 is T 2 (D 4 -D 3) thin portion Wa A thin pipe 28 having a different diameter is formed.

このように、薄肉部Ｗａの長さＬ３及びその位置は、縮径長さ（パイプ材Ｗの一端から任意の距離）Ｌ３を設定することにより任意に設定することができ、薄肉部Ｗａの肉厚Ｔ２（Ｄ４−Ｄ３）は、ダイス６の内径Ｄ４とポンチ７の外径Ｄ３を設定することにより任意に設定することができる。なお、薄肉部Ｗａの肉厚Ｔ２はパイプ材Ｗの肉厚Ｔの半分位までにすることができる。 Thus, the length L 3 of the thin portion Wa and the position thereof can be arbitrarily set by setting the reduced diameter length (arbitrary distance from one end of the pipe material W) L 3 , and the thin portion Wa The wall thickness T 2 (D 4 -D 3 ) can be arbitrarily set by setting the inner diameter D 4 of the die 6 and the outer diameter D 3 of the punch 7. Incidentally, the thickness T 2 of the thin portion Wa can be to the nearest half of a thickness T of the pipe material W.

本発明によれば、パイプ材の肉厚を部分的に薄肉化することができると共に、パイプ材の薄肉部の肉厚、薄肉部の範囲を任意に設定することができるので、汎用性のある部分的薄肉パイプの製造方法を構築することができる。また、出発材料のパイプ外径と成形後のパイプ外径が等しいので、設計が容易で使用しやすい。
したがって、本発明に係る方法で製造された外径が同径で片端が薄肉のパイプ、外径が同径で部分的に薄肉のパイプや外径が異径で薄肉のパイプなどを自動車部品に用いれば、軽量化に寄与することができる。 According to the present invention, the thickness of the pipe material can be partially reduced, and the thickness of the thin part of the pipe material and the range of the thin part can be arbitrarily set, so that it is versatile. A manufacturing method for partially thin pipes can be established. Moreover, since the pipe outer diameter of the starting material is equal to the pipe outer diameter after molding, the design is easy and easy to use.
Therefore, pipes with the same outer diameter and one end that are manufactured by the method according to the present invention, thin pipes with the same outer diameter and partially thin pipes, pipes with different outer diameters and thin walls, etc. are used as automobile parts. If used, it can contribute to weight reduction.

本発明に係る部分的薄肉パイプの製造方法の第１実施の形態の説明図Explanatory drawing of 1st Embodiment of the manufacturing method of the partial thin wall pipe which concerns on this invention 同径片端薄肉パイプの断面図Cross section of the same diameter one end thin pipe 本発明に係る部分的薄肉パイプの製造方法の第２実施の形態の説明図Explanatory drawing of 2nd Embodiment of the manufacturing method of the partial thin wall pipe which concerns on this invention 同径部分的薄肉パイプの断面図Cross section of the same diameter partially thin pipe 本発明に係る部分的薄肉パイプの製造方法の第３実施の形態の説明図Explanatory drawing of 3rd Embodiment of the manufacturing method of the partial thin wall pipe which concerns on this invention 異径薄肉パイプの断面図Cross section of thin pipe with different diameter

符号の説明Explanation of symbols

１，１１…ダイス位置決め工程、２，１２…ポンチ圧入工程、３，２４…引抜工程、６，２６…ダイス、７，２７…ポンチ、８…同径片端薄肉パイプ、１３…第１引抜工程、１４…ポンチ引抜工程、１５…第２引抜工程、１８…同径部分的薄肉パイプ、２１…ポンチ挿入工程、２２…縮径工程、２３…ポンチ押当工程、２８…異径薄肉パイプ、Ｗ…パイプ材、Ｗａ…薄肉部。   DESCRIPTION OF SYMBOLS 1,11 ... Die positioning process, 2,12 ... Punch press-fit process, 3,24 ... Extraction process, 6,26 ... Die, 7, 27 ... Punch, 8 ... Same diameter one end thin pipe, 13 ... 1st extraction process, DESCRIPTION OF SYMBOLS 14 ... Punch extraction process, 15 ... 2nd extraction process, 18 ... Partial diameter thin pipe of the same diameter, 21 ... Punch insertion process, 22 ... Reduction diameter process, 23 ... Punch pushing process, 28 ... Different diameter thin pipe, W ... Pipe material, Wa ... Thin part.

Claims (4)

外径が同径の部分的薄肉パイプを製造する方法であって、パイプ材の外径に略等しい内径のダイスを前記パイプ材の一端に外嵌してダイスをパイプ材に沿って所定位置まで相対的に移動して位置決めするダイス位置決め工程と、このダイス位置決め工程に引き続いてポンチを前記パイプ材の他端から所定位置まで前記パイプ材の外径を拡大しつつ圧入するポンチ圧入工程と、このポンチ圧入工程に引き続いて前記ポンチと前記ダイスの位置関係を固定した状態で前記パイプ材を引き抜く引抜工程とからなることを特徴とする部分的薄肉パイプの製造方法。 A method of manufacturing a partially thin pipe having the same outer diameter, and a die having an inner diameter substantially equal to the outer diameter of the pipe material is externally fitted to one end of the pipe material, and the die is moved to a predetermined position along the pipe material. A die positioning step for relatively moving and positioning, and a punch press-fitting step for press-fitting the punch while expanding the outer diameter of the pipe material from the other end of the pipe material to a predetermined position following the die positioning step, A method for producing a partially thin-walled pipe comprising a drawing step of drawing the pipe material in a state where the positional relationship between the punch and the die is fixed following the punch press-fitting step. 外径が同径の部分的薄肉パイプを製造する方法であって、パイプ材の外径に略等しい内径のダイスを前記パイプ材の一端に外嵌してダイスをパイプ材に沿って所定位置まで相対的に移動して位置決めするダイス位置決め工程と、このダイス位置決め工程に引き続いてポンチを前記パイプ材の他端から所定位置まで前記パイプ材の外径を拡大しつつ圧入するポンチ圧入工程と、このポンチ圧入工程に引き続いて前記ポンチと前記ダイスの位置関係を固定した状態で前記パイプ材を引抜設定位置まで引き抜く第１引抜工程と、前記パイプ材と前記ダイスを固定した状態で前記ポンチを引き抜くポンチ引抜工程と、前記パイプ材又は前記ダイスを引き抜く第２引抜工程からなることを特徴とする部分的薄肉パイプの製造方法。 A method of manufacturing a partially thin pipe having the same outer diameter, and a die having an inner diameter substantially equal to the outer diameter of the pipe material is externally fitted to one end of the pipe material, and the die is moved to a predetermined position along the pipe material. A die positioning step of relatively moving and positioning, a punch press-in step of pressing the punch while expanding the outer diameter of the pipe material from the other end of the pipe material to a predetermined position following the die positioning step, Following the punch press-fitting step, a first drawing step of drawing the pipe material to a drawing set position in a state where the positional relationship between the punch and the die is fixed, and a punch for pulling out the punch while fixing the pipe material and the die. A method for producing a partially thin pipe, comprising a drawing step and a second drawing step of drawing the pipe material or the die. 外径が異径の部分的薄肉パイプを製造する方法であって、ポンチを前記パイプ材に縮径予定長さ以上まで前記パイプ材の一端から挿入するポンチ挿入工程と、このポンチ挿入工程に引き続いて前記パイプ材の一端に嵌合させたダイスを移動して前記パイプ材を前記縮径長さだけ縮径する縮径工程と、前記ポンチを移動して前記パイプ材を介して前記ダイスに押し当てるポンチ押当工程と、前記ポンチと前記ダイスの位置関係を固定した状態で前記パイプ材を引き抜く引抜工程からなることを特徴とする部分的薄肉パイプの製造方法。 A method of manufacturing a partially thin pipe having different outer diameters, wherein a punch is inserted into the pipe material from one end of the pipe material to a length not less than the planned diameter reduction, and this punch insertion step is followed. A diameter reducing step of moving the die fitted to one end of the pipe material to reduce the diameter of the pipe material by the reduced diameter length, and moving the punch to push the die through the pipe material. A method of manufacturing a partially thin-walled pipe, comprising: a punch pressing step for hitting, and a drawing step for pulling out the pipe material in a state where the positional relationship between the punch and the die is fixed. 請求項１乃至請求項３の何れかに記載の部分的薄肉パイプの製造方法において、前記引抜工程が、前記パイプ材を固定した状態で、前記ポンチと前記ダイスを移動して前記パイプ材から離脱するようにしたことを特徴とする部分的薄肉パイプの製造方法。 4. The method of manufacturing a partially thin pipe according to claim 1, wherein in the drawing step, the punch and the die are moved and detached from the pipe material while the pipe material is fixed. 5. A method for producing a partially thin-walled pipe, characterized in that:
JP2004298064A 2004-10-12 2004-10-12 Method for manufacturing partially thin-walled pipe Expired - Lifetime JP4565960B2 (en)

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JPH07148516A (en) * 1993-08-20 1995-06-13 Schumag Gmbh Method of pretreating thick wall pipe blank for pulling out succeeding cascade

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CN102463271A (en) * 2010-11-08 2012-05-23 北京有色金属研究总院 Production method of zinc base alloy thin-wall pipe
WO2017154481A1 (en) * 2016-03-11 2017-09-14 新日鐵住金株式会社 Method for manufacturing different-thickness steel pipe, and different-thickness steel pipe
JP6256668B1 (en) * 2016-03-11 2018-01-10 新日鐵住金株式会社 Manufacturing method of differential thickness steel pipe and differential thickness steel pipe
KR20180110000A (en) * 2016-03-11 2018-10-08 신닛테츠스미킨 카부시키카이샤 A method of manufacturing a steel pipe having a different thickness and a steel pipe having a different thickness
CN108712935A (en) * 2016-03-11 2018-10-26 新日铁住金株式会社 The manufacturing method and the thick steel pipe of difference of poor thickness steel pipe
KR102062076B1 (en) * 2016-03-11 2020-01-03 닛폰세이테츠 가부시키가이샤 Manufacturing method of steel pipe with different thickness and steel pipe with different thickness
US11590547B2 (en) 2016-03-11 2023-02-28 Nippon Steel Corporation Method of manufacturing variable wall thickness steel pipe and variable wall thickness steel pipe
CN114340812A (en) * 2019-09-06 2022-04-12 株式会社三五 Extrusion molding method and extrusion molding device for unequal-thickness pipes
CN114340812B (en) * 2019-09-06 2024-02-06 株式会社三五 Extrusion molding method and extrusion molding device for non-uniform thickness pipes
CN112058937A (en) * 2020-07-29 2020-12-11 宁波大学 Long hollow tube inner wall thinning forming method

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