JP2017070979A - Method for manufacturing pipe material - Google Patents

Method for manufacturing pipe material Download PDF

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JP2017070979A
JP2017070979A JP2015199126A JP2015199126A JP2017070979A JP 2017070979 A JP2017070979 A JP 2017070979A JP 2015199126 A JP2015199126 A JP 2015199126A JP 2015199126 A JP2015199126 A JP 2015199126A JP 2017070979 A JP2017070979 A JP 2017070979A
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mold
pipe material
polygonal
concave inner
manufacturing
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JP6591252B2 (en
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弘毅 山口
Koki Yamaguchi
弘毅 山口
栄一 野崎
Eiichi Nozaki
栄一 野崎
仁哉 辻
Jinya Tsuji
仁哉 辻
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Otics Corp
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Otics Corp
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Priority to EP16001786.9A priority patent/EP3153247A1/en
Priority to US15/262,650 priority patent/US20170100766A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B21D53/845—Making camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/025—Stamping using rigid devices or tools for tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a pipe material which can realize relative convenience and cost reduction.SOLUTION: A method for manufacturing a pipe material including a drawing process in which a long cylindrical pre-pipe material 50 is located between a first mold 10 and a second mold 20, the first mold 10 and the second mold 20 are closed thereby pressurizing the pre-pipe material 50 from an outer periphery thereof, and drawing 55 is formed on an outer peripheral surface 50M thereof. The first mold 10 has a first recess 10A comprising a polygonal surface on a face 11 facing the second mold 20, and the second mold 20 has a second recess 20A comprising a polygonal surface on a face 21 facing the first mold 10. In the drawing process, the pre-pipe material 50 is pressurized while being restricted by a first polygonal concaved inner face 100 of the first recess 10A and a second polygonal concaved inner face 200 of the second recess 20A thereby forming polygonal drawing 55 equivalent to a sum of the number of inner faces of the first polygonal concaved inner face 100 and the number of inner faces of the first polygonal concaved inner face 200.SELECTED DRAWING: Figure 2

Description

本発明は、パイプ材の製造方法に関する。   The present invention relates to a method for manufacturing a pipe material.

従来、その管経路に例えばテーパ部が施されたり、管外周に六角形状が施されたパイプを製造する方法として、特許文献１に記載のものが知られている。具体的には、中空状のエキゾーストパイプ（パイプ材）の一部を絞り加工する際、スウェージング加工を用いてパイプの外径が次第に縮径するようなテーパ部を設ける方法を採用している。   Conventionally, for example, a method described in Patent Document 1 is known as a method of manufacturing a pipe in which a tapered portion is provided on the pipe path or a hexagonal shape is provided on the outer periphery of the pipe. Specifically, when drawing a part of a hollow exhaust pipe (pipe material), a method is employed in which a tapered portion is provided by using swaging so that the outer diameter of the pipe is gradually reduced. .

特開２０００−２４０４４９号公報JP 2000-240449 A

しかしながら、管経路を変更したり、管外周形状を変更したりする際にスウェージング加工を用いる場合、パイプ材の位相を変えながらその外周面に連続的に打撃を与えることが必要で、高額な専用機が必要となる。また、パイプ材の角度を変えながら一部ずつ加工していくため、その仕上がりにおけるパイプ材の要求精度によっては、スウェージング加工中にパイプ材が曲がってしまう事態を回避すべくパイプ材内部に芯金を挿入することが必要となるが、パイプ形状によってはその内部に芯金を挿入することができない場合もある。   However, when swaging is used when changing the pipe path or changing the pipe outer shape, it is necessary to continuously hit the outer peripheral surface while changing the phase of the pipe material, which is expensive. A special machine is required. Also, because the pipe material is processed part by part while changing the angle of the pipe material, depending on the required accuracy of the pipe material at the finish, the core inside the pipe material should be avoided to avoid bending the pipe material during swaging. Although it is necessary to insert gold | metal | money, depending on pipe shape, a metal core cannot be inserted in the inside.

本発明は上記のような事情に基づいて完成されたものであって、比較的簡便で、コスト削減を実現可能とするパイプ材の製造方法を提供することを目的とする。   The present invention has been completed based on the above-described circumstances, and an object of the present invention is to provide a pipe material manufacturing method that is relatively simple and can realize cost reduction.

上記課題を解決するために、本発明は、長尺円筒状をなすとともに、その端部を除いた少なくとも一部の外周に断面視多角形状の絞りを設けたパイプ材の製造方法であって、第１型と第２型との間に長尺円筒状のプレパイプ材を配し、前記第１型と前記第２型を型閉じすることで前記プレパイプ材をその外周から加圧し、その外周面に前記絞りを形成する絞り工程を含み、前記第１型は、前記第２型と対向する面に多角面からなる第１凹部を有し、前記第２型は、前記第１型と対向する面に多角面からなる第２凹部を有し、前記絞り工程では、前記第１凹部の第１多角凹内面と前記第２凹部の第２多角凹内面とにより前記プレパイプ材を拘束しつつ、前記第１多角凹内面と前記第２多角凹内面とにより前記プレパイプ材の外周を加圧することで、前記第１多角凹内面の内面数と前記第２多角凹内面の内面数との和に相当する多角形状の絞りを形成することを特徴とする。   In order to solve the above problems, the present invention is a method of manufacturing a pipe material that has a long cylindrical shape and is provided with a polygonal-shaped diaphragm in at least a part of its outer periphery excluding its end, A long cylindrical pre-pipe material is arranged between the first die and the second die, and the pre-pipe material is pressurized from the outer periphery by closing the first die and the second die, and the outer peripheral surface thereof. The first mold has a first concave portion having a polygonal surface on the surface facing the second mold, and the second mold faces the first mold. In the drawing step, the pre-pipe material is restrained by the first polygonal concave inner surface of the first concave portion and the second polygonal concave inner surface of the second concave portion, Pressurizing the outer periphery of the pre-pipe material with the first polygonal concave inner surface and the second polygonal concave inner surface , And forming the aperture of the polygonal shape corresponding to the sum of the inner surface speed of the inner surface number and the second polygonal concave inner surface of the first polygonal concave inner surface.

このようなパイプ材の製造方法によると、第１型と第２型とによってプレパイプ材の外周から加圧しつつ型閉じすることで、一度の絞り工程によってパイプ材の外周面に多角形状を施すことが可能となり、パイプ材の製造工程に要する時間を短縮できる。また、絞り加工を行うにあたり、例えばスウェージング加工のような高額な専用機を用いる方法に比べて、比較的安価な方法で実現できる。   According to such a pipe material manufacturing method, the outer periphery of the pipe material is subjected to a polygonal shape by a single drawing process by closing the mold while applying pressure from the outer periphery of the pre-pipe material using the first mold and the second mold. This makes it possible to shorten the time required for the pipe material manufacturing process. Further, the drawing process can be realized by a relatively inexpensive method compared to a method using an expensive dedicated machine such as a swaging process.

上記パイプ材の製造方法において、前記多角形状は、正六角形状であり、前記第１型は、正六角形状を構成する面のうち３面を有し、前記第２型は、正六角形状を構成する面のうち残り３面を有し、前記プレパイプ材の外径Ｘに対して、前記第１型と前記第２型とを型閉じした状態における前記第１多角凹内面と前記第２多角凹内面との互いに対向する面同士の距離Ｙを０．７７Ｘ〜０．９５Ｘとし、前記絞り工程において、前記第１型と前記第２型とを型閉じする際に、前記第１型が有する前記３面と前記第２型が有する前記３面とにより、前記プレパイプ材の外周に対して圧力をかけるものとすることができる。   In the pipe material manufacturing method, the polygonal shape is a regular hexagonal shape, the first mold has three surfaces constituting a regular hexagonal shape, and the second mold has a regular hexagonal shape. The first polygonal concave inner surface and the second polygonal shape in a state in which the remaining three surfaces among the surfaces to be configured and the first mold and the second mold are closed with respect to the outer diameter X of the pre-pipe material The distance Y between the opposing surfaces to the concave inner surface is set to 0.77X to 0.95X, and the first mold has the first mold and the second mold when the first mold and the second mold are closed in the drawing step. Pressure can be applied to the outer periphery of the pre-pipe material by the three surfaces and the three surfaces of the second mold.

このようなパイプ材の製造方法によると、各３面により簡便にプレパイプ材の外周面を拘束しつつ加圧することが可能となり、より確実に所望する正六角形状の絞り加工を施すことが可能となる。   According to such a pipe material manufacturing method, it is possible to pressurize while easily constraining the outer peripheral surface of the pre-pipe material by each of the three surfaces, and it is possible to more reliably perform a desired regular hexagonal drawing process. Become.

上記パイプ材の製造方法において、前記パイプ材は、エンジン構成部品であるカムシャフトの軸となるシャフトであるものとすることができる。このようなパイプ材の製造方法によると、カムシャフトの軸となるシャフトの中間部分に多角形状の絞りを設けることができ、カムの位置調整等の作業時において利便性に優れたものとなる。   In the pipe material manufacturing method, the pipe material may be a shaft that is a shaft of a camshaft that is an engine component. According to such a pipe material manufacturing method, a polygonal aperture can be provided in the intermediate portion of the shaft that becomes the shaft of the camshaft, which is excellent in convenience during operations such as cam position adjustment.

上記パイプ材の製造方法において、前記絞り工程において、前記プレパイプ材のうち前記第１型と前記第２型とで加圧される箇所の近傍を、その外周から保持部材で保持するものとすることができる。このようなパイプ材の製造方法によると、保持部材によりプレパイプ材の外周が拘束されるため、プレパイプ材に絞り加工を施す際、プレパイプ材が変形してしまう事態を軽減できる。また、その内部に芯金を挿入することができないような形状のプレパイプ材を用いる場合であっても、その外周から保持部材により拘束することにより、プレパイプ材の曲がりを防止できる。   In the pipe material manufacturing method, in the drawing step, the vicinity of the portion to be pressurized by the first mold and the second mold in the pre-pipe material is held from its outer periphery by a holding member. Can do. According to such a pipe material manufacturing method, since the outer periphery of the pre-pipe material is restrained by the holding member, it is possible to reduce a situation where the pre-pipe material is deformed when the pre-pipe material is drawn. Further, even when a pre-pipe material having a shape in which a core metal cannot be inserted therein is used, it is possible to prevent the pre-pipe material from being bent by restraining it from the outer periphery with a holding member.

本発明によれば、比較的簡便で、コスト削減を実現可能とするパイプ材の製造方法を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the pipe material which can implement | achieve comparatively simple and cost reduction can be provided.

本発明の製造方法を用いて製造されたシャフト（パイプ材）を有するカムシャフトの斜視図The perspective view of the cam shaft which has the shaft (pipe material) manufactured using the manufacturing method of this invention. 絞り工程の態様を示す斜視図A perspective view showing a mode of a drawing process 絞り工程の態様を示す断面図（第１多角凹内面と第２多角凹内面との間にプレパイプ材を配した状態）Sectional drawing which shows the aspect of a drawing process (The state which has arranged the pre-pipe material between the 1st polygonal concave inner surface and the 2nd polygonal concave inner surface) 絞り工程の態様を示す断面図（プレパイプ材の外周面に、第１多角凹内面及び第２多角凹内面が部分的に当接した状態）（図２のＶ−Ｖ線断面図）Sectional drawing which shows the aspect of a drawing process (The state where the 1st polygonal concave inner surface and the 2nd polygonal concave inner surface partially contact | abutted to the outer peripheral surface of the pre-pipe material) (VV sectional view taken on the line of FIG. 2) 絞り工程の態様を示す断面図（第１型と第２型を型閉じした状態）Sectional drawing which shows the aspect of a drawing process (The state which closed the 1st type | mold and the 2nd type | mold) 六角部が形成されたシャフトの斜視図Perspective view of shaft with hexagonal part formed 一端部が先細り形状をなすパイプ材の長手方向における断面図（図６のＶＩ−ＶＩ線断面図に相当）Sectional view in the longitudinal direction of a pipe material whose one end is tapered (corresponding to the sectional view taken along line VI-VI in FIG. 6)

本発明の実施形態を図１ないし図７によって説明する。なお、図３〜図５においては、保持部材７０を省略して図示するものとする。図１に示すカムシャフト３４０は、エンジンの構成部品の一つで、シャフト（パイプ材）３０一本に対してエンジンの吸排気バルブの開閉を行う複数のカム４０（４１〜４８）をまとめて備えている。これら複数のカム４０（４１〜４８）は、シャフト３０に対して一体回転可能に組み付けられており、紙面上左寄りの隣り合うカム４２とカム４３の間には、断面視正六角形状の六角部５５が設けられている。シャフト３０に対して各カム４０を取り付ける際、この六角部５５（六角形状をなす向かい合う平面）をレンチ等工具（図示せず）の先端で挟持しつつ、各カム４０の位置決めや位置合わせ等の調整作業を行う。なお、この六角部５５は、長尺円筒状をなすプレパイプ材５０の一端部寄りの一部の外周に断面視正六角形状の絞りを設けることにより形成されている（図６参照）。   An embodiment of the present invention will be described with reference to FIGS. 3 to 5, the holding member 70 is omitted from the illustration. The camshaft 340 shown in FIG. 1 is one of the components of the engine, and a plurality of cams 40 (41 to 48) for opening and closing the intake / exhaust valves of the engine with respect to one shaft (pipe material) 30 are gathered. I have. The plurality of cams 40 (41 to 48) are assembled so as to be integrally rotatable with respect to the shaft 30, and a hexagonal portion having a regular hexagonal shape in cross section is formed between the adjacent cam 42 and the cam 43 on the left side of the drawing. 55 is provided. When the cams 40 are attached to the shaft 30, the hexagonal portions 55 (facing hexagonal facing planes) are sandwiched between the tips of tools (not shown) such as a wrench, and the cams 40 are positioned and aligned. Perform adjustment work. The hexagonal portion 55 is formed by providing a regular hexagonal-shaped diaphragm in a cross section in the outer periphery of a part near one end of the pre-pipe material 50 having a long cylindrical shape (see FIG. 6).

（シャフト３０の製造方法）
図６に示すような六角部５５を設けたシャフト３０の製造方法としては、まず、長尺円筒状のプレパイプ材５０を製造する。プレパイプ材５０には、一般的なパイプ材の原料であるＳＴＫＭ１３Ｃを用いて、その外径が２５ｍｍ、厚みが３．５ｍｍとなるように製造する。その後、端部を除いた所望の位置にその断面視正六角形となるような絞り加工を施す。 (Manufacturing method of shaft 30)
As a manufacturing method of the shaft 30 provided with the hexagonal portion 55 as shown in FIG. 6, first, a long cylindrical pre-pipe material 50 is manufactured. The pre-pipe material 50 is manufactured using STKM13C, which is a general pipe material, so that the outer diameter is 25 mm and the thickness is 3.5 mm. Thereafter, drawing is performed at a desired position excluding the end so as to form a regular hexagon in cross-section.

絞り加工を施すための絞り工程では、図２〜図５に示すように、上方に配される第１型１０と下方に配される第２型２０を備えたプレス成形装置を用いる（第１型１０，第２型２０のみ図示）。第１型１０は、第２型２０と対向する面１１に多角面からなる第１凹部１０Ａを有しており、該第１凹部１０Ａは、正六角形状を構成する面のうち３面（第１多角凹内面１０１，１０２，１０３）を有する。一方、第２型２０も、第１型１０と対向する面２１に多角面からなる第２凹部２０Ａを有しており、該第２凹部２０Ａは、正六角形状を構成する面のうち残り３面（第２多角凹内面２０４，２０５，２０６）を有する。以後、第１多角凹内面１０１，１０２，１０３を総称するときは第１多角凹内面１００と言い、第２多角凹内面２０４，２０５，２０６を総称するときは第２多角凹内面２００と言う。   In the drawing process for drawing, as shown in FIGS. 2 to 5, a press forming apparatus including a first die 10 disposed above and a second die 20 disposed below is used. Only the mold 10 and the second mold 20 are shown). The first mold 10 has a first concave portion 10A formed of a polygonal surface on the surface 11 facing the second mold 20, and the first concave portion 10A has three surfaces (first surfaces) forming a regular hexagonal shape. 1 polygonal concave inner surface 101, 102, 103). On the other hand, the second mold 20 also has a second concave portion 20A formed of a polygonal surface on the surface 21 facing the first mold 10, and the second concave portion 20A is the remaining three of the surfaces constituting the regular hexagonal shape. It has a surface (second polygonal concave inner surface 204, 205, 206). Hereinafter, the first polygonal concave inner surface 101, 102, 103 is collectively referred to as the first polygonal concave inner surface 100, and the second polygonal concave inner surface 204, 205, 206 is generically referred to as the second polygonal concave inner surface 200.

このような第１型１０と第２型２０を型閉じすると、第１多角凹内面１００と第２多角凹内面２００とにより正六角形が形成されるような構成となっている（図５参照）。そして、このように型閉じした状態における第１多角凹内面１００と第２多角凹内面２００との互いに対向する面同士の距離が２２ｍｍとなるような構成となっている。具体的には、第１多角凹内面１０１と第２多角凹内面２０４，第１多角凹内面１０２と第２多角凹内面２０５，第１多角凹内面１０３と第２多角凹内面２０６の、それぞれの面幅Ｗ１が一律２２ｍｍとなっている。つまり、ここではプレパイプ材５０の外径に対して、第１型１０と第２型２０とを型閉じした状態における第１多角凹内面１００と第２多角凹内面２００との互いに対向する面同士の距離の比率が約０．８８となっている。なお、第１型１０と第２型２０とを型閉じした状態における第１多角凹内面１００と第２多角凹内面２００との互いに対向する面同士の距離Ｙは、プレパイプ材５０の外径Ｘに対して好ましくは０．７７Ｘ〜０．９５Ｘの範囲となることが望ましい。面同士の距離Ｙが０．７７Ｘ未満の場合は、プレパイプ材５０の一部が型凹部外に漏れる可能性があり、０．９５Ｘを超えると所望の六角形形状を形成できない場合がある。   When the first mold 10 and the second mold 20 are closed, a regular hexagon is formed by the first polygonal concave inner surface 100 and the second polygonal concave inner surface 200 (see FIG. 5). . And the distance between the mutually opposing surfaces of the first polygonal concave inner surface 100 and the second polygonal concave inner surface 200 in the mold closed state is 22 mm. Specifically, the first polygonal concave inner surface 101 and the second polygonal concave inner surface 204, the first polygonal concave inner surface 102 and the second polygonal concave inner surface 205, the first polygonal concave inner surface 103 and the second polygonal concave inner surface 206, respectively. The surface width W1 is uniformly 22 mm. That is, here, the mutually opposing surfaces of the first polygonal concave inner surface 100 and the second polygonal concave inner surface 200 in a state where the first die 10 and the second die 20 are closed with respect to the outer diameter of the pre-pipe material 50. The distance ratio is about 0.88. In addition, the distance Y between the mutually opposing surfaces of the first polygonal concave inner surface 100 and the second polygonal concave inner surface 200 in a state where the first mold 10 and the second mold 20 are closed is the outer diameter X of the pre-pipe material 50. On the other hand, it is desirable that the range is 0.77X to 0.95X. If the distance Y between the faces is less than 0.77X, a part of the pre-pipe material 50 may leak out of the mold recess, and if it exceeds 0.95X, a desired hexagonal shape may not be formed.

図３に示すように、このような第１型１０における第１凹部１０Ａの第１多角凹内面１００と、第２型２０における第２凹部２０Ａの第２多角凹内面２００との間にプレパイプ材５０を配した後、第１型１０と第２型２０を型閉じする。このとき、第１多角凹内面１０１，１０３と第２多角凹内面２０４，２０６とによりプレパイプ材５０を拘束しつつ型閉じすることとなり、その型閉じに基づき、第１多角凹内面１０１，１０３と第２多角凹内面２０４，２０６とにより、ひいては第１多角凹内面１０２と第２多角凹内面２０５とにより、プレパイプ材５０の外周は軸心に向かって加圧されることとなる。なお、この型閉じにおけるプレパイプ材５０への荷重はおよそ１００ｋＮである。   As shown in FIG. 3, the pre-pipe material between the first polygonal concave inner surface 100 of the first recess 10 </ b> A in the first mold 10 and the second polygonal concave inner surface 200 of the second recess 20 </ b> A in the second mold 20. After arranging 50, the first mold 10 and the second mold 20 are closed. At this time, the mold is closed while restraining the pre-pipe material 50 by the first polygonal concave inner surfaces 101, 103 and the second polygonal concave inner surfaces 204, 206, and based on the mold closing, the first polygonal concave inner surfaces 101, 103 and The outer circumference of the pre-pipe material 50 is pressurized toward the axis by the second polygonal concave inner surfaces 204 and 206, and by the first polygonal concave inner surface 102 and the second polygonal concave inner surface 205. In addition, the load to the pre-pipe material 50 in this mold closing is about 100 kN.

つまり、型閉じした状態における第１凹部１０Ａと第２凹部２０Ａ内の対向する面同士の距離２２ｍｍに対し、プレパイプ材５０の外径２５ｍｍの方が大きいため、第１型１０と第２型２０を型閉じしてゆくと、まず第１多角凹内面１０１，１０３及び第２多角凹内面２０４，２０６が、Ｙ１方向に加圧するようにプレパイプ材５０の外周面５０Ｍにそれぞれ当接して該箇所の塑性変形が始まる。そして第１型１０と第２型２０が完全に型閉じした状態となるべく更に加圧を進めると、塑性変形が進み上下に位置する第１多角凹内面１０２及び第２多角凹内面２０５もプレパイプ材５０の外周面５０Ｍに当接し、該箇所も塑性加工されることとなる。このように、第１型１０と第２型２０を型閉じする際、第１多角凹内面１００と第２多角凹内面２００とでプレパイプ材５０の外周面５０Ｍに対して圧力をかける。そして最終的に第１型１０と第２型２０が型閉じした状態で、プレパイプ材５０の外周に第１多角凹内面１００（１０１，１０２，１０３）の内面数３と第２多角凹内面２００（２０４，２０５，２０６）の内面数３との和に相当する正六角形となる多角形状の絞りが形成される。こうして、一部の外周に断面視正六角形状の六角部５５を設けたシャフト３０が製造される。   That is, since the outer diameter of 25 mm of the pre-pipe material 50 is larger than the distance of 22 mm between the opposing surfaces in the first recess 10A and the second recess 20A in the mold closed state, the first mold 10 and the second mold 20 When the mold is closed, first, the first polygonal concave inner surfaces 101 and 103 and the second polygonal concave inner surfaces 204 and 206 are respectively brought into contact with the outer peripheral surface 50M of the pre-pipe material 50 so as to pressurize in the Y1 direction. Plastic deformation begins. When further pressurization is performed as much as possible so that the first mold 10 and the second mold 20 are completely closed, the first polygonal concave inner surface 102 and the second polygonal concave inner surface 205 positioned on the upper and lower sides are also pre-pipe material. 50 abuts on the outer peripheral surface 50M, and this portion is also plastically processed. As described above, when the first mold 10 and the second mold 20 are closed, pressure is applied to the outer peripheral surface 50M of the pre-pipe material 50 by the first polygonal concave inner surface 100 and the second polygonal concave inner surface 200. Finally, with the first mold 10 and the second mold 20 closed, the inner surface number 3 of the first polygonal concave inner surface 100 (101, 102, 103) and the second polygonal concave inner surface 200 are formed on the outer periphery of the pre-pipe material 50. A polygonal aperture that is a regular hexagon corresponding to the sum of the inner surface number 3 of (204, 205, 206) is formed. In this way, the shaft 30 provided with the hexagonal portion 55 having a regular hexagonal cross-sectional view on a part of the outer periphery is manufactured.

なお、絞り工程の際、図２に示すようにプレパイプ材５０のうち第１型１０と第２型２０とで加圧される箇所（絞り加工される箇所）の近傍を、その外周から保持部材７０で保持する。この保持部材７０はプレパイプ材５０と同様に長尺円筒状をなしており、その内径はプレパイプ材５０の外径に倣うものとされている。このようにプレパイプ材５０の外周を保持部材７０で拘束することにより、第１型１０と第２型２０とにより荷重がかかる際、プレパイプ材５０が曲がってしまう事態を防止することができる。また、図７に示すような一端部２５０Ｔが先細り形状をなすようなプレパイプ材に六角部２５５を設けたシャフト２３０を製造する場合、その内部に芯金を挿入することができないため、このように六角部２５５となる箇所以外の箇所を保持部材７０で外周から保持することは有効である。   In the drawing process, as shown in FIG. 2, a holding member is provided from the outer periphery of the pre-pipe material 50 in the vicinity of the place where the first mold 10 and the second mold 20 are pressed (the place to be drawn). Hold at 70. The holding member 70 has a long cylindrical shape similar to the pre-pipe material 50, and the inner diameter thereof follows the outer diameter of the pre-pipe material 50. By constraining the outer periphery of the pre-pipe material 50 with the holding member 70 in this way, it is possible to prevent the pre-pipe material 50 from being bent when a load is applied by the first mold 10 and the second mold 20. In addition, when manufacturing the shaft 230 in which the hexagonal portion 255 is provided in the pre-pipe material in which the one end portion 250T has a tapered shape as shown in FIG. 7, the cored bar cannot be inserted into the shaft 230. It is effective to hold a portion other than the portion that becomes the hexagonal portion 255 from the outer periphery with the holding member 70.

続いて、本実施形態の作用・効果について説明する。
上記のようなパイプ材３０の製造方法によると、第１型１０と第２型２０とによってプレパイプ材５０の外周から加圧しつつ型閉じすることで、一度の絞り工程によってパイプ材３０の外周面５０Ｍに多角形状を施すことが可能となり、パイプ材３０の製造工程に要する時間を短縮できる。また、絞り加工を行うにあたり、例えばスウェージング加工のような高額な専用機を用いる方法に比べて、比較的安価な方法で実現できる。 Then, the effect | action and effect of this embodiment are demonstrated.
According to the manufacturing method of the pipe material 30 as described above, the outer peripheral surface of the pipe material 30 is closed by pressing once from the outer periphery of the pre-pipe material 50 by the first mold 10 and the second mold 20, thereby performing the drawing process once. It becomes possible to give polygonal shape to 50M, and the time which the manufacturing process of the pipe material 30 requires can be shortened. Further, the drawing process can be realized by a relatively inexpensive method compared to a method using an expensive dedicated machine such as a swaging process.

また上記のようなパイプ材３０の製造方法によると、第１型１０は、正六角形状を構成する面のうち３面を有し、第２型２０は、正六角形状を構成する面のうち残り３面を有し、プレパイプ材５０の外径Ｘに対して、第１型１０と第２型２０とを型閉じした状態における第１多角凹内面１００と第２多角凹内面２００との互いに対向する面同士の距離Ｙを０．７７Ｘ〜０．９５Ｘとし、絞り工程において、第１型１０と第２型２０とを型閉じする際に、第１型１０の３面と第２型２０の３面とによりプレパイプ材５０の外周に対して圧力をかけるものとしているため、簡便にプレパイプ材５０の外周面５０Ｍを拘束しつつ加圧することが可能となり、より確実に所望する正六角形状の絞り加工を施すことが可能となる。   Moreover, according to the manufacturing method of the pipe material 30 as described above, the first mold 10 has three faces among the faces constituting the regular hexagon shape, and the second mold 20 is among the faces constituting the regular hexagon shape. The first polygonal concave inner surface 100 and the second polygonal concave inner surface 200 in the state in which the first mold 10 and the second mold 20 are closed with respect to the outer diameter X of the pre-pipe material 50 having the remaining three surfaces. When the distance Y between the opposing surfaces is 0.77X to 0.95X and the first mold 10 and the second mold 20 are closed in the drawing process, the three surfaces of the first mold 10 and the second mold 20 are closed. Since the pressure is applied to the outer periphery of the pre-pipe material 50 by the three surfaces, it is possible to easily pressurize the outer surface 50M of the pre-pipe material 50 while constraining the outer surface 50M. Drawing can be performed.

また上記のようなパイプ材３０の製造方法によると、カムシャフト３４０の軸となるシャフト３０の中間部分に多角形状の絞り５５を設けることができ、カム４０の位置調整等の作業時において利便性に優れたものとなる。   Further, according to the manufacturing method of the pipe member 30 as described above, the polygonal aperture 55 can be provided in the intermediate portion of the shaft 30 that becomes the axis of the camshaft 340, and thus it is convenient when adjusting the position of the cam 40. It will be excellent.

また上記のようなパイプ材３０の製造方法によると、保持部材７０によりプレパイプ材５０の外周が拘束されるため、プレパイプ材５０に絞り加工を施す際、プレパイプ材５０が変形してしまう事態を軽減できる。また、その内部に芯金を挿入することができないような形状のプレパイプ材５０を用いる場合であっても、その外周から保持部材７０により拘束することで、プレパイプ材５０の曲がりを防止できる。   Moreover, according to the manufacturing method of the pipe material 30 as described above, since the outer periphery of the pre-pipe material 50 is constrained by the holding member 70, the situation where the pre-pipe material 50 is deformed when the pre-pipe material 50 is drawn is reduced. it can. Further, even when the pre-pipe material 50 having such a shape that the core metal cannot be inserted therein is used, the pre-pipe material 50 can be prevented from being bent by being restrained by the holding member 70 from the outer periphery.

１０…第１型、１０Ａ…第１凹部、１１…第１型１０において第２型２０と対向する面、２０…第２型、２０Ａ…第２凹部、２１…第２型２０において第１型１０と対向する面、３０…シャフト（パイプ材）、５０…プレパイプ材、５０Ｍ…プレパイプ材５０の外周面、５５…六角部（絞り）、１００（１０１，１０２，１０３）…第１多角凹内面、２００（２０４，２０５，２０６）…第２多角凹内面 DESCRIPTION OF SYMBOLS 10 ... 1st type | mold, 10A ... 1st recessed part, 11 ... The surface facing the 2nd type | mold 20 in the 1st type | mold 10, 20 ... 2nd type | mold, 20A ... 2nd recessed part, 21 ... 1st type | mold in the 2nd type | mold 20 10. Surface facing 10; 30 ... Shaft (pipe material); 50 ... Prepipe material; 50M ... Outer peripheral surface of prepipe material 50; 55 ... Hexagonal portion (diaphragm); 100 (101, 102, 103) ... First polygonal concave inner surface , 200 (204, 205, 206) ... second polygonal concave inner surface

Claims (4)

長尺円筒状をなすとともに、その端部を除いた少なくとも一部の外周に断面視多角形状の絞りを設けたパイプ材の製造方法であって、
第１型と第２型との間に長尺円筒状のプレパイプ材を配し、前記第１型と前記第２型を型閉じすることで前記プレパイプ材をその外周から加圧し、その外周面に前記絞りを形成する絞り工程を含み、
前記第１型は、前記第２型と対向する面に多角面からなる第１凹部を有し、
前記第２型は、前記第１型と対向する面に多角面からなる第２凹部を有し、
前記絞り工程では、前記第１凹部の第１多角凹内面と前記第２凹部の第２多角凹内面とにより前記プレパイプ材を拘束しつつ、前記第１多角凹内面と前記第２多角凹内面とにより前記プレパイプ材の外周を加圧することで、前記第１多角凹内面の内面数と前記第２多角凹内面の内面数との和に相当する多角形状の絞りを形成することを特徴とするパイプ材の製造方法。 A manufacturing method of a pipe material having a long cylindrical shape and provided with a polygonal-shaped diaphragm in at least a part of the outer periphery excluding its end,
A long cylindrical pre-pipe material is arranged between the first die and the second die, and the pre-pipe material is pressurized from the outer periphery by closing the first die and the second die, and the outer peripheral surface thereof. Including a drawing step for forming the drawing,
The first mold has a first recess formed of a polygonal surface on a surface facing the second mold,
The second mold has a second concave portion formed of a polygonal surface on a surface facing the first mold,
In the drawing step, the pre-pipe material is restrained by the first polygonal concave inner surface of the first concave part and the second polygonal concave inner surface of the second concave part, and the first polygonal concave inner surface and the second polygonal concave inner surface A pipe having a polygonal shape corresponding to the sum of the number of inner surfaces of the first polygonal concave inner surface and the number of inner surfaces of the second polygonal concave inner surface is formed by pressurizing the outer periphery of the pre-pipe material by A method of manufacturing the material. 前記多角形状は、正六角形状であり、
前記第１型は、正六角形状を構成する面のうち３面を有し、
前記第２型は、正六角形状を構成する面のうち残り３面を有し、
前記プレパイプ材の外径Ｘに対して、前記第１型と前記第２型とを型閉じした状態における前記第１多角凹内面と前記第２多角凹内面との互いに対向する面同士の距離Ｙを０．７７Ｘ〜０．９５Ｘとし、
前記絞り工程において、前記第１型と前記第２型とを型閉じする際に、前記第１型が有する前記３面と前記第２型が有する前記３面とにより、前記プレパイプ材の外周に対して圧力をかけることを特徴とする請求項１に記載のパイプ材の製造方法。 The polygonal shape is a regular hexagonal shape,
The first mold has three of the faces constituting a regular hexagon shape,
The second mold has the remaining three surfaces among the surfaces constituting a regular hexagonal shape,
The distance Y between the mutually opposing surfaces of the first polygonal concave inner surface and the second polygonal concave inner surface in a state where the first mold and the second mold are closed with respect to the outer diameter X of the pre-pipe material. Is 0.77X to 0.95X,
In the drawing step, when the first mold and the second mold are closed, the outer surface of the pre-pipe material is formed by the three surfaces of the first mold and the three surfaces of the second mold. 2. The method for producing a pipe material according to claim 1, wherein pressure is applied to the pipe material. 前記パイプ材は、エンジン構成部品であるカムシャフトの軸となるシャフトであることを特徴とする請求項１又は請求項２に記載のパイプ材の製造方法。   The pipe material manufacturing method according to claim 1, wherein the pipe material is a shaft that is a shaft of a camshaft that is an engine component. 前記絞り工程において、前記プレパイプ材のうち前記第１型と前記第２型とで加圧される箇所の近傍を、その外周から保持部材で保持することを特徴とする請求項１から請求項３のいずれか一項に記載のパイプ材の製造方法。   In the said drawing process, the vicinity of the location pressurized with the said 1st type | mold and the said 2nd type | mold among the said pre-pipe materials is hold | maintained with the holding member from the outer periphery. The manufacturing method of the pipe material as described in any one of these.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001009529A (en) * 1999-06-29 2001-01-16 Nissan Motor Co Ltd Method and device for fluid pressure molding, and member for vehicle
JP2004019494A (en) * 2002-06-13 2004-01-22 Nissan Motor Co Ltd Assembly type camshaft for engine, and its manufacturing method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000240449A (en) 1999-02-23 2000-09-05 Nojima Engineering:Kk Exhaust pipe
JP2007044761A (en) * 2005-08-12 2007-02-22 Yukiyoshi Murakami Method for manufacturing square pipe
DE102010025593A1 (en) * 2010-06-27 2011-12-29 Technische Universität Dortmund Method and apparatus for the incremental deformation of profile tubes, in particular of profile tubes with varying cross-sections over the longitudinal axis
US8631671B2 (en) * 2011-04-14 2014-01-21 GM Global Technology Operations LLC Internal mandrel and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001009529A (en) * 1999-06-29 2001-01-16 Nissan Motor Co Ltd Method and device for fluid pressure molding, and member for vehicle
JP2004019494A (en) * 2002-06-13 2004-01-22 Nissan Motor Co Ltd Assembly type camshaft for engine, and its manufacturing method

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