JP2006110567A - Partially thin-walled pipe manufacturing method - Google Patents
Partially thin-walled pipe manufacturing method Download PDFInfo
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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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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims description 103
- 238000003825 pressing Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 20
- 238000000605 extraction Methods 0.000 description 4
- 230000013011 mating Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
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).
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.
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.
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Cited By (4)
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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 |
CN112058937A (en) * | 2020-07-29 | 2020-12-11 | 宁波大学 | Long hollow tube inner wall thinning forming method |
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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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