JP4153880B2 - Method and apparatus for manufacturing stepped hollow member - Google Patents

Method and apparatus for manufacturing stepped hollow member Download PDF

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JP4153880B2
JP4153880B2 JP2004023966A JP2004023966A JP4153880B2 JP 4153880 B2 JP4153880 B2 JP 4153880B2 JP 2004023966 A JP2004023966 A JP 2004023966A JP 2004023966 A JP2004023966 A JP 2004023966A JP 4153880 B2 JP4153880 B2 JP 4153880B2
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stepped
hole
hollow material
core mold
hollow
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JP2005211966A (en
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典男 西川
典史 横田
広治 菅原
啓一 松永
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Aisin Corp
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Aisin Seiki Co Ltd
Aisin Corp
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    • 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
    • B21K23/00—Making other articles
    • B21K23/04—Making other articles flanged articles

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing a stepped hollow member with which the working defect in the case of forming a deformed hole projecting a large diameter step part between both cylindrical end parts and having different cross section to the circle, is reduced and working precision is improved. <P>SOLUTION: The method and the apparatus for producing the stepped hollow member, is performed through the following processes. In a preforming process, the tapered part 6 formed as the large diameter toward between both end parts in the outer periphery of a hollow blank is smoothly preformed and also, the preform member 8 is preformed so that the center hole size gradually is reduced toward both end parts of the hollow blank in the center hole 5. In a finish-forming process, the force toward the center direction of a second core die 24 with the tapered part 6 becoming the large diameter toward the large diameter step part 10 of the preformed member 8 is generated from the force in the vertical direction with a finish-forming dies 23a, 23b and the material fluidity so as to cling to a second core die 24, is smoothly generated because the center hole size is formed, so as to be smoothly reduced. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

本発明は、円筒状両端部の間に大径段部が突設され軸線上に断面が円と異なる異形穴が貫通された段付中空部材の製造方法及び装置に関する。   The present invention relates to a method and an apparatus for manufacturing a stepped hollow member in which a large-diameter stepped portion is provided between both cylindrical end portions and a deformed hole having a cross section different from a circle is penetrated on an axis.

従来、段付の中空部材の製造方法としては、段部となる部分を予め所定の温度に加熱し、さらに軸方向両端から押圧してすえ込み加工しているものがある（特許文献１参照）。   Conventionally, as a method for manufacturing a stepped hollow member, there is a method in which a step portion is heated to a predetermined temperature in advance and further pressed from both ends in the axial direction (see Patent Document 1). .

また、段付中空部材の他の製造方法としては、中空部材の両端部を絞り加工により、当該部材の中間部より小径の外径とし、さらに大径段部に形成した前記中間部と両端部を正規の形状寸法に成形加工しているものがある（特許文献２参照）。
特開２００２−２８２９９１号公報（第４頁、図３〜図６） 特開２００１−１２１２４１号公報（第３頁,第４頁、図１〜図３） Further, as another manufacturing method of the stepped hollow member, both the end portions of the hollow member are drawn to a smaller outer diameter than the intermediate portion of the member, and the intermediate portion and the both end portions formed in the large diameter step portion. Is formed into a regular shape (see Patent Document 2).
Japanese Patent Laid-Open No. 2002-282991 (page 4, FIGS. 3 to 6) JP 2001-121241 A (3rd page, 4th page, FIGS. 1 to 3)

上記、従来の特開２００２−２８２９９１号公報や特開２００１−１２１２４１号公報に示される技術では、外径が大きく成形されて段部となった部分において、その中空の内径は外径に応じて大きく変形してしまうため、一定の寸法の内径を得ることは難しい。特に、内径形状を外径形状である円形とは異なる異形状に成形することは困難であった。   In the above-described techniques disclosed in Japanese Patent Application Laid-Open Nos. 2002-2829191 and 2001-121241, the hollow inner diameter of the portion formed by forming a large outer diameter into a stepped portion depends on the outer diameter. Due to the large deformation, it is difficult to obtain an inner diameter with a certain size. In particular, it has been difficult to form the inner diameter shape into a different shape from the circular shape that is the outer diameter shape.

例えば、これらの製造方法を使った、中心穴を外径形状とは異なる形状とする段付中空部材の製造工程を図１２a〜図１２eに示す。   For example, FIGS. 12a to 12e show a manufacturing process of a stepped hollow member in which the center hole has a shape different from the outer diameter shape using these manufacturing methods.

まず、図１２aに示される円柱形状のブランク７１を、図１２bに示すように鍛造等により下部における所望の外径寸法に近似する細径部７２を成形する。   First, a cylindrical blank 71 shown in FIG. 12a is formed into a narrow-diameter portion 72 that approximates a desired outer diameter at the lower portion by forging or the like as shown in FIG. 12b.

次に、図１２cに示すように鍛造等によりほぼ矩形状の異形穴７３を成形するが、図１２ｄに示される段部７５を成形する工程においてくびれが生じさらには切欠環状溝７６となって、段付中空部材の強度を低下させてしまうおそれがあった。また、そのため、図１２eに示される最終工程において、底部が貫通されて、中心穴を矩形とする異形穴７４は得られるが、所定の寸法形状の異形穴７４とすることも困難であった。   Next, as shown in FIG. 12c, a substantially rectangular deformed hole 73 is formed by forging or the like, but constriction occurs in the step of forming the step 75 shown in FIG. There was a risk of reducing the strength of the stepped hollow member. For this reason, in the final step shown in FIG. 12e, a deformed hole 74 having a rectangular center hole is obtained by penetrating the bottom, but it is also difficult to form the deformed hole 74 having a predetermined size and shape.

本発明は、以上の従来技術の問題点に鑑みてなされたものであり、その目的は、中空素材の外周において該中空素材の両端部からその間に向かって大径となるテーパ部をなだらかに予備成形するとともに、中心穴においても中心穴寸法を中空素材の両端に向かってなだらかに小さくなるように予備成形部材を予備成形し、次に、予備成形部材を仕上げ成形することにより、仕上げ成形型による上下方向の力から、予備成形部材の大径段部に向かって大径となるテーパ部により第２芯型の中心方向に向かう力を発生させ、また、中心穴寸法もなだらかに縮小されるように成形されていることにより、第２芯型に抱きつくような材料流動をスムーズに生じさせ、段付中空部材の中心穴の内周にくびれが生じることがなく、切欠環状溝を発生させることもない段付中空部材の製造方法及び装置を提供することである。   The present invention has been made in view of the above-mentioned problems of the prior art, and the object thereof is to gently reserve a tapered portion having a large diameter from both ends of the hollow material toward the middle on the outer periphery of the hollow material. In addition to molding, the preforming member is pre-formed so that the center hole size gradually decreases toward both ends of the hollow material in the center hole, and then the preforming member is finish-molded. From the force in the vertical direction, a force toward the center direction of the second core mold is generated by the tapered portion having a large diameter toward the large-diameter step portion of the preformed member, and the size of the center hole is also reduced gradually. The material flow that hugs the second core mold is generated smoothly, and the inner periphery of the center hole of the stepped hollow member is not constricted, and a notched annular groove is generated. To provide a method and apparatus for producing a stepped hollow member without also.

上述した課題を解決するために、請求項１に係る発明の構成上の特徴は、円筒状両端部の間に大径段部が突設され軸線上に断面が円と異なる異形穴が貫通された段付中空部材の製造方法において、中空素材を前記異形穴に対応する断面形状を有する第１芯型に嵌挿し、各対向面のうち少なくとも一方の対向面に開口するテーパ穴が形成されている一対の予備成形型を前記第１芯型を包囲して互いに接近させることにより、前記中空素材の少なくとも一方の端部を前記テーパ穴内周面で押圧するステップを１あるいは複数回行って、中空素材の外周面に前記中空素材の両端部の間に向かって大径となるテーパ部を成形するとともに、中空素材の中心穴寸法が前記中空素材の両端に向かって漸減し、かつ前記第１芯型に向かって異形状に減少するように前記中空素材を予備仕上して予備成形部材とする予備成形工程と、前記予備成形部材を前記第１芯型から抜き取り、前記異形穴に対応する断面形状を有する第２芯型に嵌挿し、前記大径段部を両側から仕上げ成形する段部仕上げ面が夫々形成され、前記円筒状両端部の外径に夫々対応する内径の仕上穴が各段部仕上げ面に開口する一対の仕上げ成形型を、前記第２芯型を包囲して互いに接近させることにより、前記予備成形部材の前記テーパ部を前記各仕上穴及び段部仕上面で押圧して前記円筒状両端部及び大径段部を形成するとともに、前記第２芯型に押圧して前記中心穴を前記異形穴に形成する仕上げ成形工程とを有するとしたことである。   In order to solve the above-described problem, the structural feature of the invention according to claim 1 is that a large-diameter stepped portion is provided between the cylindrical end portions, and a deformed hole having a cross-section different from a circle is penetrated on the axis. In the manufacturing method of the stepped hollow member, a hollow material is inserted into a first core mold having a cross-sectional shape corresponding to the deformed hole, and a tapered hole is formed in at least one of the opposing surfaces. The step of pressing at least one end of the hollow material with the inner peripheral surface of the taper hole is performed one or more times by enclosing a pair of preforming dies surrounding the first core mold and approaching each other. A taper portion having a large diameter is formed on the outer peripheral surface of the material between both ends of the hollow material, and the center hole dimension of the hollow material is gradually reduced toward both ends of the hollow material, and the first core Reduces to a different shape toward the mold A preforming step in which the hollow material is preliminarily finished to form a preformed member, and the preformed member is extracted from the first core mold and is inserted into a second core mold having a cross-sectional shape corresponding to the deformed hole, A pair of finish forming dies each having a step finish surface for finishing and molding the large-diameter step portion from both sides, each having a finish hole having an inner diameter corresponding to the outer diameter of each of the cylindrical end portions. By encircling the second core mold and approaching each other, the tapered portions of the preformed member are pressed by the finishing holes and the stepped surface, so that the cylindrical both end portions and the large diameter stepped portion are pressed. And forming the center hole into the deformed hole by pressing against the second core mold.

なお、予備成形工程は、仕上げ成形工程前に中空素材の両端にテーパ部を成形する目的でなされるものである。そのため、両端のテーパ部を一回で予備成形することもできるし、一方の端部にテーパ部を成形したのち、他方の端部にテーパ部を成形するようにしてもよい。具体的には、各対向面に開口するテーパ穴が夫々形成された一対の予備成形型を、前記第１芯型を包囲して互いに接近させることにより一回で中空素材の両端部にテーパ部を成形することができる。また、各対向面のうち一方の対向面にテーパ穴が形成された一対の予備成形型を前記第１芯型を包囲して互いに接近させることにより前記中空素材の一方の端部にテーパ部を形成し、各対向面のうち他方の対向面にテーパ穴が形成された一対の予備成形型を前記第１芯型を包囲して互いに接近させることにより前記中空素材の他方の端部にテーパ部を成形するようにしてもよい。   Note that the preliminary molding step is performed for the purpose of forming tapered portions at both ends of the hollow material before the finish molding step. Therefore, the taper portions at both ends can be preformed once, or after the taper portion is formed at one end portion, the taper portion may be formed at the other end portion. Specifically, a pair of preforming dies each formed with a tapered hole that opens on each facing surface surrounds the first core die and approaches each other so that taper portions are formed at both ends of the hollow material at a time. Can be molded. Further, a taper portion is formed at one end of the hollow material by enclosing a pair of preforming dies having a tapered hole formed on one of the opposing surfaces so as to surround the first core die. A taper portion is formed at the other end of the hollow material by forming a pair of preforming dies having a tapered hole formed on the other facing surface among the facing surfaces so as to surround the first core die and approach each other. You may make it shape | mold.

請求項２に係る発明の特徴は、前記仕上げ成形工程後において、前記異形穴の角部に軸線方向に伸びる溝を形成するとともに内壁面を円柱形状に倣う円弧面に形成する工程を有する請求項１記載の段付中空部材の製造方法としたことである。   A feature of the invention according to claim 2 is the step of forming a groove extending in the axial direction at a corner portion of the deformed hole and forming an inner wall surface into an arc surface following a cylindrical shape after the finish forming step. It is that it was set as the manufacturing method of the stepped hollow member of 1 description.

請求項３に係る発明の特徴は、前記中空素材は、前記異形穴をほぼ相似形状に拡大した断面形状の中心穴を有する円筒形状とし、円柱状のブランクを鍛造加工して前記中空素材を成形することを特徴とする請求項１または請求項２記載の段付中空部材の製造方法としたことである。   A feature of the invention according to claim 3 is that the hollow material is formed into a cylindrical shape having a center hole having a cross-sectional shape obtained by enlarging the deformed hole into a substantially similar shape, and a cylindrical blank is forged to form the hollow material. The method for producing a stepped hollow member according to claim 1 or 2 is characterized in that:

請求項４に係る発明の特徴は、円筒状両端部の間に大径段部が突設され軸線上に断面が円と異なる異形穴が貫通された段付中空部材の製造装置において、前記異形穴に対応する断面形状を有し、中空素材が嵌挿される第１芯型と、各対向面のうち少なくとも一方の対向面に前記第１芯型を包囲するテーパ穴が開口する一対あるいは複数対の予備成形型であって、前記中空素材の端部を前記テーパ穴内周面で押圧して中空素材の外周面に前記中空素材の両端部から両端部の間に向かって大径となるテーパ部を成形するとともに、中空素材の中心穴寸法が前記中空素材の両端に向かって漸減し、かつ前記第１芯型に向かって異形状に減少するように前記中空素材を予備成形部材に成形する一対あるいは複数対の予備成形型と、両端部にテーパ部が成形された予備成形部材を前記第１芯型から抜き取る手段と、前記異形穴に対応する断面形状を有し、前記予備成形部材が嵌挿される第２芯型と、前記大径段部を両側から仕上げ成形する段部仕上げ面が夫々対向して形成され、かつ前記円筒状両端部の外径に夫々対応する内径の仕上穴が前記各段部仕上げ面に開口し、前記第２芯型を包囲して接離可能に装架された一対の仕上げ成形型であって、前記予備成形部材の前記テーパ部に前記各仕上穴及び段部仕上面を押圧させて前記円筒状両端部及び大径段部を成形するとともに、前記中心穴を前記第２芯型に押圧させて前記異形穴を形成する一対の仕上げ成形型とを有する段付中空部材の製造装置としたことである。   A feature of the invention according to claim 4 is that in the manufacturing apparatus of a stepped hollow member in which a large-diameter stepped portion is provided between both cylindrical end portions and a deformed hole having a cross-section different from a circle is penetrated on the axis, A pair or a plurality of pairs each having a first core mold having a cross-sectional shape corresponding to the hole and in which a hollow material is inserted, and at least one of the facing surfaces having a tapered hole surrounding the first core mold. A taper portion having a diameter that increases from the both ends of the hollow material toward the outer peripheral surface of the hollow material by pressing the end portion of the hollow material with the inner peripheral surface of the taper hole. And forming the hollow material into a preformed member so that the center hole dimension of the hollow material gradually decreases toward both ends of the hollow material and decreases to an irregular shape toward the first core mold. Alternatively, multiple pairs of pre-molding dies and tapered portions at both ends Means for extracting the shaped preform member from the first core mold, a second core mold having a cross-sectional shape corresponding to the deformed hole, and into which the preform member is inserted; The step finished surfaces to be finished from are respectively formed to face each other, and finish holes having inner diameters corresponding to the outer diameters of both cylindrical end portions open to the step finished surfaces, respectively, A pair of finishing molds that are enclosed and detachably mounted, and press each of the finishing holes and the stepped surface to the tapered portion of the preformed member, and the cylindrical ends and the large diameter While forming a step part, it is set as the manufacturing apparatus of the stepped hollow member which has a pair of finishing shaping | molding die which presses the said center hole to the said 2nd core type | mold, and forms the said deformed hole.

上記のように構成した請求項１に係る段付中空部材の製造方法は、予備成形部材を得る予備成形工程で、中空素材の外周においては、中空素材の両端から該中空素材の両端の間に向かって大径となるテーパ部がなだらかに予備成形され、中心穴においても中心穴寸法を中空素材の両端に向かってなだらかに小さくなるように第１芯型に向かって縮小されるよう予備成形されている。   The manufacturing method of the stepped hollow member according to claim 1 configured as described above is a preforming step for obtaining a preformed member, and on the outer periphery of the hollow material, between the both ends of the hollow material from the both ends of the hollow material. The taper portion having a larger diameter is gradually preformed, and the center hole is also preformed to be reduced toward the first core mold so that the center hole size is gradually reduced toward both ends of the hollow material. ing.

そのため、段付中空部材を得る仕上げ工程において、次のように成形される。   Therefore, in the finishing process for obtaining the stepped hollow member, the molding is performed as follows.

すなわち、仕上げ成形型により上下方向より加わる力は、前記テーパ部により第２芯型の中心方向に向かう力を発生させる。また、中心穴寸法も中空素材の両端部に向かってなだらかに縮小されるように成形されている。そのため、第２芯型に抱きつくような材料流動をスムーズに生じさせ、段付中空部材の中心穴の内周にくびれが生じることがなく、切欠環状溝を発生させることもない。   That is, the force applied from the vertical direction by the finish mold generates a force directed toward the center of the second core mold by the tapered portion. Also, the center hole is shaped so as to be gradually reduced toward both ends of the hollow material. Therefore, a material flow that hugs the second core mold is generated smoothly, the inner periphery of the center hole of the stepped hollow member is not constricted, and a notched annular groove is not generated.

また、中心穴の内径の形状が円の場合には、仕上げ成形工程で中心穴を縮径する際の加工度は円周方向で同じであるが、中心穴の内径の形状が円とは異なる異形状であると、中心穴を仕上げ工程で縮径する際の加工度が円周方向で均一とはならない。そのため、中心穴の形状が異形状の場合は、加工度の違いにより成形が困難である。しかし、本発明においては、予備成形工程により中心穴寸法を中空素材の両端部に向かってなだらかに縮小するようにし、仕上げ成形工程において第２芯型に抱きつくような材料流動をスムーズに生じさせることにより、加工度の違いによる成形の困難さが解消される。   Also, when the shape of the inner diameter of the center hole is a circle, the degree of processing when reducing the diameter of the center hole in the finish molding process is the same in the circumferential direction, but the shape of the inner diameter of the center hole is different from the circle. If the shape is irregular, the degree of processing when the center hole is reduced in the finishing process is not uniform in the circumferential direction. For this reason, when the shape of the center hole is irregular, it is difficult to mold due to the difference in the degree of processing. However, in the present invention, the center hole size is gradually reduced toward the both ends of the hollow material by the preforming process, and the material flow that hugs the second core mold in the finish molding process is smoothly generated. This eliminates the difficulty of molding due to the difference in the degree of processing.

上記のように構成した請求項２に係る段付中空部材の製造方法においては、異形穴の角部に軸線方向に伸びる溝と円柱形状に倣う円弧面とを成形し易い異形状に、中心穴が前記仕上げ成形工程で成形されているので、中心穴に前記溝や円弧面を形成するとき塑性加工しろが少なくて済み、かつ流動変形もスムーズに生じ、材料歩留りの良い安価かつ高精度の寸法形状の段付中空部材を成形することができる。   In the manufacturing method of the stepped hollow member according to claim 2 configured as described above, the center hole has an irregular shape that is easy to mold an axially extending groove and a circular arc surface following the cylindrical shape at the corner of the irregular hole. Is formed in the finish molding process, so when forming the groove or arc surface in the center hole, there is less plastic working margin, flow deformation also occurs smoothly, and the material yield is low-cost and high-precision. A stepped hollow member having a shape can be formed.

上記のように構成した請求項３に係る段付中空部材の製造方法においては、中空素材が円形の中心穴を有する円筒形状でなく、異形穴を形成する前段階にある概略的形状すなわち異形穴をほぼ相似形状に拡大した断面形状の中心穴を有する円筒形状であるため、中心穴を段階的に所望される異形の寸法形状に近づけることができ、鍛造加工における材料の流動変形に無理がなく、加工精度が高くかつ加工不良が少ない段付中空部材を提供することができる。   In the manufacturing method of the stepped hollow member according to claim 3 configured as described above, the hollow material is not a cylindrical shape having a circular center hole, but a rough shape, that is, a deformed hole in a stage before forming the deformed hole. Since it has a cylindrical shape with a center hole with a cross-sectional shape expanded to a similar shape, the center hole can be brought close to the desired irregular shape in a stepwise manner, and there is no difficulty in fluid deformation of the material in forging It is possible to provide a stepped hollow member with high processing accuracy and few processing defects.

上記のように構成した請求項４に係る段付部材の製造装置においては、中空素材の外周においては、中空素材の両端から該中空素材の両端の間に向かって大径となるテーパ部がなだらかに予備成形され、中心穴においても中心穴寸法を中空素材の両端に向かってなだらかに小さくなるように第１芯型に向かって縮小されるよう予備成形されている。   In the manufacturing apparatus of the stepped member according to claim 4 configured as described above, on the outer periphery of the hollow material, the tapered portion having a large diameter gradually extends from both ends of the hollow material to both ends of the hollow material. The center hole is also preliminarily molded so as to be reduced toward the first core mold so that the center hole size is gradually reduced toward both ends of the hollow material.

そのため、仕上げ成形工程において、仕上げ成形型により上下方向から加わる力は、前記テーパ部により第２芯型の中心方向に向かう力を発生させる。また、中心穴寸法もなだらかに縮小されるように成形されているので、加工度の違いによる成形の困難さが解消される。そのため、第２芯型に抱きつくような材料流動をスムーズに生じさせ、段付中空部材の中心穴の内周にくびれが生じることがなく、切欠環状溝を発生させることもない。   Therefore, in the finish molding step, the force applied from the up and down direction by the finish molding die generates a force toward the center direction of the second core mold by the tapered portion. In addition, since the center hole dimension is formed so as to be gradually reduced, the difficulty in forming due to the difference in processing degree is solved. Therefore, a material flow that hugs the second core mold is generated smoothly, the inner periphery of the center hole of the stepped hollow member is not constricted, and a notched annular groove is not generated.

本発明に係る段付中空部材の製造方法及び装置の実施形態を図面に基づいて以下に説明する。 Embodiments of a method and apparatus for manufacturing a stepped hollow member according to the present invention will be described below with reference to the drawings.

まず、図１乃至図３は、中空素材４の成形工程を示す図であり、上面図と断面図とにより表示されている。   First, FIG. 1 thru | or FIG. 3 is a figure which shows the shaping | molding process of the hollow raw material 4, and is displayed with the top view and sectional drawing.

図１は、円柱状のブランク１を示し、図２は、ブランク１を鍛造加工して中心穴２を穿設した工程を示している。図３は、さらにプレス加工により底部３を打ち抜き、中心穴２を貫通させて中空素材４を成形した工程を示している。この工程で成形された中空素材４は、完成した段付中空部材に形成される異形穴をほぼ相似形状に拡大した断面形状の中心穴２を有する円筒形状となっている。   FIG. 1 shows a cylindrical blank 1, and FIG. 2 shows a process in which the blank 1 is forged and a center hole 2 is formed. FIG. 3 shows a process in which the bottom 3 is further punched out by pressing and the hollow material 4 is formed through the center hole 2. The hollow material 4 formed in this step has a cylindrical shape having a center hole 2 having a cross-sectional shape obtained by enlarging a deformed hole formed in the completed stepped hollow member into a substantially similar shape.

次に、図４及び図５は、中空素材４を予備成形部材８に成形をする予備成形工程及び装置を示している。   Next, FIGS. 4 and 5 show a preforming process and apparatus for forming the hollow material 4 into the preforming member 8.

予備成形部材８を成形する予備成形装置３１は、基台１４の上に載置固定された下部予備成形型１５aと、該下部予備成形型１５aの上方に対向して配設され、対をなす上部予備成形型１５bとを備えている。上部予備成形型１５bは、基台１４に図略のガイドに摺動可能に装架されたラム１７に固着され、該ラム１７は駆動装置としてのナックルプレス機構１６の駆動に連動するように構成されている。   A preforming device 31 for forming the preforming member 8 is disposed so as to be paired with a lower preform 15a placed and fixed on the base 14, and opposed to the lower preform 15a. And an upper preforming die 15b. The upper preforming die 15b is fixed to a ram 17 slidably mounted on a guide (not shown) on the base 14, and the ram 17 is configured to be interlocked with the driving of a knuckle press mechanism 16 as a driving device. Has been.

下部予備成形型１５aには、上方の対向面１５cに向かって漸増的に広く開口するテーパ穴１５dが設けられ、該テーパ穴１５dには前記中空素材４がその下端において当接するとともに、第１芯型１８を嵌挿した状態で載置されている。   The lower preforming die 15a is provided with a tapered hole 15d that gradually and widely opens toward the upper facing surface 15c. The hollow material 4 abuts at the lower end of the tapered hole 15d, and a first core is formed. The mold 18 is placed in a state where it is inserted.

上部予備成形型１５bには、下方の対向面１５eに向かって漸増的に広く開口するテーパ穴１５fが設けられ、該テーパ穴１５fには上端部において当接するよう前記中空素材４が配置されている。また、上部予備成形型１５bは、その上端において前記ラム１７に固着され、前記ナックルプレス機構１６の駆動により垂直に上下動するように構成されている。   The upper preforming die 15b is provided with a tapered hole 15f that gradually and widely opens toward the lower facing surface 15e, and the hollow material 4 is disposed in the tapered hole 15f so as to come into contact with the upper end portion. . The upper preforming die 15b is fixed to the ram 17 at the upper end thereof, and is configured to move vertically up and down by driving the knuckle press mechanism 16.

なお、テーパ穴１５d,１５fは内径が直線的に漸増する円錐面とする必要はなく、段階的又は曲線的に漸増するものであってもよい。   The tapered holes 15d and 15f do not have to be conical surfaces whose inner diameters increase linearly, and may increase gradually or stepwise.

また、同予備成形装置３１は、該下部予備成形型１５aの中央に立設された第１芯型１８と、該第１芯型１８の周囲を上下に摺動可能に動く載置台１９を上部に設けた抜き取り手段としての抜取機構２０とを備えている。   Further, the preforming apparatus 31 includes a first core mold 18 erected at the center of the lower preform mold 15a, and a mounting table 19 that moves slidably up and down around the first core mold 18. And an extraction mechanism 20 as an extraction means provided in the apparatus.

抜取機構２０は、前記載置台１９とその下方に伸びる連結軸２１と、該連結軸２１を上下に摺動させるシリンダ機構２２とにより構成され、該載置台１９は第１芯型１８の下部より上方に向かって上下動するようになっている。   The extraction mechanism 20 includes the mounting table 19, a connecting shaft 21 extending below the mounting table 19, and a cylinder mechanism 22 that slides the connecting shaft 21 up and down. The mounting table 19 is formed from the lower portion of the first core mold 18. It moves up and down.

上記予備成形装置３１によると、図４及び図５に示すように、ナックルプレス機構１６を駆動させることにより、第１芯型１８を包囲するように上部・下部の予備成形型１５a,１５bが互いに接近し、中空素材４の上下の両端部をそれぞれのテーパ穴１５d,１５fの内周面で押圧成形する。   According to the preforming device 31, as shown in FIGS. 4 and 5, the knuckle press mechanism 16 is driven so that the upper and lower preforming dies 15a and 15b are surrounded with each other so as to surround the first core die 18. The upper and lower ends of the hollow material 4 are pressed and molded by the inner peripheral surfaces of the respective tapered holes 15d and 15f.

この場合、中空素材４が円形の中心穴を有する円筒形状でなく、異形穴を形成する前段階にある概略的形状すなわち異形穴をほぼ相似形状に拡大した断面形状の中心穴２を有する円筒形状であるため、中心穴を段階的に所望される異形の寸法形状に近づけることができ、鍛造加工における材料の流動変形に無理がなく、加工精度が高くかつ加工不良が少ない。   In this case, the hollow material 4 is not a cylindrical shape having a circular center hole, but a cylindrical shape having a central shape 2 having a cross-sectional shape obtained by enlarging the deformed hole into a substantially similar shape, that is, a pre-stage before forming the deformed hole. Therefore, the center hole can be brought close to the desired dimensional shape in a stepwise manner, there is no difficulty in the flow deformation of the material in the forging process, the processing accuracy is high, and the processing defects are few.

この予備成形工程によって、中空素材４の外周面に中間大径部７が成形され、該中間大径部７に向かって大径となるテーパ部６が予備成形される。また、中空素材４の中心穴２の中心穴寸法を、大径段部部分から両端に向かって漸次小さくなるように縮小してほぼ異形状の中心穴５に予備仕上げされる。   By this preforming step, the intermediate large diameter portion 7 is formed on the outer peripheral surface of the hollow material 4, and the tapered portion 6 having a large diameter toward the intermediate large diameter portion 7 is preformed. Further, the center hole size of the center hole 2 of the hollow material 4 is reduced so as to gradually become smaller from the large-diameter step portion toward both ends, and the center hole 5 is preliminarily finished to have a substantially irregular shape.

以上により、図６の予備成形部材８が得られる。   Thus, the preformed member 8 shown in FIG. 6 is obtained.

次に、図７に示すように、抜取機構２０のシリンダ機構２２を作動させることにより、載置台１９を上方へ移動させ、予備成形部材８を第１芯型１８より抜き取り、次工程に搬送する。   Next, as shown in FIG. 7, by operating the cylinder mechanism 22 of the extraction mechanism 20, the mounting table 19 is moved upward, the preforming member 8 is extracted from the first core mold 18 and conveyed to the next process. .

次に、予備成形部材８を前記段付中空部材１１に成形する仕上げ成形装置３２は、図８及び図９に示すように、基台１４の上に載置固定された下部仕上げ成形型２３aと、該下部仕上げ成形型２３aの上方に配設され、対をなす上部仕上げ成形型２３bとを備え、該上部仕上げ成形型２３bは、駆動装置であるナックルプレス機構１６の力を伝えるラム１７に固着されている。   Next, as shown in FIGS. 8 and 9, the finish molding device 32 for molding the preformed member 8 into the stepped hollow member 11 includes a lower finish molding die 23 a mounted and fixed on the base 14. The upper finishing mold 23b is disposed above the lower finishing mold 23a and is paired with the upper finishing mold 23b. The upper finishing mold 23b is fixed to the ram 17 for transmitting the force of the knuckle press mechanism 16 serving as a driving device. Has been.

下部仕上げ成形型２３aの上面には、大径段部１０を仕上げ成形する段部仕上げ面２３cが形成され、該段部仕上げ面２３cの中央部には段付中空部材１１の下方円筒状端部３０aの外径に対応する下部仕上穴２３dが開口している。   On the upper surface of the lower finish mold 23a, a stepped finish surface 23c for finish-molding the large-diameter stepped portion 10 is formed. At the center of the stepped finish surface 23c, the lower cylindrical end of the stepped hollow member 11 is formed. A lower finishing hole 23d corresponding to the outer diameter of 30a is opened.

上部仕上げ成形型２３bには、同様に大径段部１０を仕上げ成形する段部仕上げ面２３eが形成され、該段部仕上げ面２３eの中央部には段付中空部材１１の上方円筒状端部３０ｂの外径に対応する上部仕上穴２３fが開口している。また、上部仕上げ成形型２３bは、その上端において前記ラム１７に固着され、前記ナックルプレス機構１６の駆動により垂直に上下動して下部仕上げ成形型２３aに接離可能に構成されている。   Similarly, the upper finishing mold 23b is formed with a step finished surface 23e for finishing the large-diameter stepped portion 10, and the upper cylindrical end of the stepped hollow member 11 is formed at the center of the step finished surface 23e. An upper finishing hole 23f corresponding to the outer diameter of 30b is opened. The upper finishing mold 23b is fixed to the ram 17 at the upper end thereof, and is configured to move vertically up and down by driving the knuckle press mechanism 16 so as to contact and separate from the lower finishing mold 23a.

また、同仕上げ成形装置３２は、該下部仕上げ成形部材２３aの中央に立設された第２芯型２４と、該第２芯型２４の周囲を上下に摺動可能に動く載置台２５を上部に設けた抜き取り手段としての抜取機構２６とを備えている。   The finish molding apparatus 32 includes a second core mold 24 erected at the center of the lower finish molding member 23a, and a mounting table 25 that moves slidably up and down around the second core mold 24. And an extraction mechanism 26 as an extraction means provided in the apparatus.

第２芯型２４の円周方向の断面形状は、全体としてほぼ矩形状であって、四つの辺にあたる部分は夫々円弧状に凹んだように形成され、その四つの角部は極めて小さい矩形の凸部が形成されている。   The cross-sectional shape of the second core mold 24 in the circumferential direction is substantially rectangular as a whole, and the portions corresponding to the four sides are formed so as to be recessed in an arc shape, and the four corners are extremely small rectangular shapes. Protrusions are formed.

抜取機構２６は、前記載置台２５とその下方に伸びる連結軸２７と、該連結軸２７を上下に摺動させるシリンダ機構２８とにより構成され、該載置台２５は第２芯型２４の下部より上方に向かって上下動するようになっている。   The extraction mechanism 26 includes the mounting table 25, a connecting shaft 27 extending below the mounting table 25, and a cylinder mechanism 28 that slides the connecting shaft 27 up and down. The mounting table 25 is formed from the lower part of the second core mold 24. It moves up and down.

以上の仕上げ成形装置３２によると、図８に示すように、前記予備成形部材８が第２芯型２４に嵌挿され、該予備成形部材８は下端を下部仕上げ成形型２３aの段部仕上げ面２３cに当接して載置される。そして、図９に示すように、ナックルプレス機構１６を駆動させることにより第２芯型２４を包囲するように上部・下部の仕上げ成形型２３a,２３bが互いに接近し、予備成形部材８を夫々の仕上げ面２３ｃ,２３e及び仕上穴２３d,２３fの内周面で押圧成形する。このとき、同時に予備成形部材８の中心穴５は第２芯型２４に抱きつくように押圧される。これによって、段付中空部材１１の外周面に大径段部１０が仕上げ成形されるとともに、第２芯型に倣う矩形の異形穴９が仕上げ成形される。   According to the above finish molding apparatus 32, as shown in FIG. 8, the preforming member 8 is fitted into the second core mold 24, and the preforming member 8 has a lower end at the step finish surface of the lower finishing mold 23a. It is placed in contact with 23c. Then, as shown in FIG. 9, by driving the knuckle press mechanism 16, the upper and lower finish molds 23a and 23b approach each other so as to surround the second core mold 24, and the preforming member 8 is moved to the respective parts. Press molding is performed on the inner peripheral surfaces of the finished surfaces 23c and 23e and the finishing holes 23d and 23f. At the same time, the center hole 5 of the preforming member 8 is pressed so as to hug the second core mold 24. As a result, the large-diameter step portion 10 is finish-molded on the outer peripheral surface of the stepped hollow member 11 and the rectangular deformed hole 9 following the second core mold is finish-molded.

この仕上げ成形工程において、予備成形部材８は、外周には大径段部１０に向かって大径となるテーパ部６がなだらかに予備成形され、中心穴５においては中心穴寸法を大径段部部分から両端に向かってなだらかに小さくなるように第１芯型に向かって縮小されるよう成形されている。そのため、仕上げ成形型２３a,２３ｂにより上下方向より加わる力は、前記テーパ部６により第２芯型２４の中心方向に向かう力を発生させる。また、中心穴寸法もなだらかに縮小されるように成形されているので、加工度の違いによる部分的な硬度むらも生じにくい。そのため、第２芯型２４に抱きつくような材料流動をスムーズに生じさせ、段付中空部材１１の中心穴９の内周にくびれが生じることがなく、切欠環状溝を発生させることもない。なお、この仕上げ成形工程によって、図１０の段付中空部材１１が得られる。   In this finish forming step, the preforming member 8 is gently preliminarily formed with a tapered portion 6 having a large diameter toward the large-diameter step portion 10 on the outer periphery, and the center hole size is set to the large-diameter step portion in the center hole 5. It is formed so as to be reduced toward the first core mold so as to be gradually reduced from the portion toward both ends. Therefore, the force applied from the upper and lower directions by the finish molds 23 a and 23 b generates a force toward the center direction of the second core mold 24 by the tapered portion 6. In addition, since the center hole dimension is formed so as to be gradually reduced, partial hardness unevenness due to the difference in the degree of processing hardly occurs. Therefore, the material flow that hugs the second core mold 24 is generated smoothly, the inner periphery of the center hole 9 of the stepped hollow member 11 is not constricted, and the notched annular groove is not generated. In addition, the stepped hollow member 11 of FIG. 10 is obtained by this finish molding process.

次に、図示しないしごき加工による製造工程により、図１１に示すように、段付中空部材１１の中心穴９の四箇所の角に軸線方向に伸びる溝１２が形成されるとともに、中心穴９の内壁面が円柱形状に倣う円弧面１３に形成される。この場合、仕上げ成形工程で成形された段付中空部材１１の中心穴９は、円周方向の断面形状において、全体としてほぼ矩形状であって、四つの辺にあたる部分は材料が夫々円弧状に盛り上がるように形成され、その四つの角部には極めて小さい矩形の凹部が形成されている。そのため、該角部には溝１２を、辺にあたる部分には円弧面１３が成形されるとき、辺にあたる部分の余分な材料が、材料の不足する角部にスムーズに流動され、図１１に示すような所望の寸法形状の段付中空部材１１が成形される。したがって、塑性加工しろが少なくてすみ、材料歩留りの良い安価かつ高精度の寸法形状の段付中空部材を提供することができる。   Next, as shown in FIG. 11, grooves 12 extending in the axial direction are formed at four corners of the center hole 9 of the stepped hollow member 11 by a manufacturing process by ironing (not shown). The inner wall surface is formed on a circular arc surface 13 that follows a cylindrical shape. In this case, the center hole 9 of the stepped hollow member 11 formed in the finish forming step is substantially rectangular as a whole in the cross-sectional shape in the circumferential direction, and the portions corresponding to the four sides are each formed in an arc shape. The four corners are formed with extremely small rectangular recesses. Therefore, when the groove 12 is formed in the corner portion and the arc surface 13 is formed in the portion corresponding to the side, excess material in the portion corresponding to the side is smoothly flowed to the corner portion where the material is insufficient, as shown in FIG. The stepped hollow member 11 having such a desired size and shape is formed. Therefore, it is possible to provide a stepped hollow member having a small dimension and shape with low cost and high accuracy, which requires less plastic working margin and has a high material yield.

なお、上述した実施の形態においては、段付中空部材１１の中心穴９を矩形状の異形穴としたが、中心穴を三角形またはその他の多角形とする段付中空部材に本発明を適応できる。   In the above-described embodiment, the center hole 9 of the stepped hollow member 11 is a rectangular deformed hole. However, the present invention can be applied to a stepped hollow member having a triangular or other polygonal center hole. .

また、上述した実施の形態においては、溝１２を中心穴９の四箇所の角部に夫々形成するものとしたが、溝の数は限定するものではなく、必要に応じて何本でも良い。   In the embodiment described above, the grooves 12 are formed at the four corners of the center hole 9, respectively, but the number of grooves is not limited, and any number may be used as necessary.

ブランクの上面図及び断面図。The top view and sectional drawing of a blank. ブランクに中心穴を穿設した工程を示す上面図及び断面図。The top view and sectional drawing which show the process which drilled the center hole in the blank. 底部を打ち抜いて中空素材を成形した工程を示す上面図及び断面図。The top view and sectional drawing which show the process which punched the bottom part and shape | molded the hollow raw material. 予備成形装置を示す断面図。Sectional drawing which shows a preforming apparatus. 予備成形部材を成形した状態を示す図。The figure which shows the state which shape | molded the preforming member. 予備成形部材を示す上面図及び断面図。The top view and sectional drawing which show a preforming member. 予備成形部材を芯型から抜き取った状態を示す断面図。Sectional drawing which shows the state which extracted the preforming member from the core type | mold. 仕上げ成形装置を示す断面図。Sectional drawing which shows a finish molding apparatus. 段付中空部材を成形した状態を示す図。The figure which shows the state which shape | molded the stepped hollow member. 段付中空部材を示す上面図及び断面図。The top view and sectional drawing which show a stepped hollow member. 溝及び円弧面が成形された段付中空部材を示す上面図及び断面図。The top view and sectional drawing which show the stepped hollow member by which the groove | channel and the circular arc surface were shape | molded. 従来技術のブランクを示す断面図。Sectional drawing which shows the blank of a prior art. 従来技術の段付中空部材の下端細径部の成形工程を示す断面図。Sectional drawing which shows the formation process of the lower end small diameter part of the stepped hollow member of a prior art. 従来技術の段付中空部材の穿設工程を示す上面図及び断面図。The top view and sectional drawing which show the drilling process of the stepped hollow member of a prior art. 従来技術の段付中空部材の大径段部の成形工程を示す上面図及び断面図。The top view and sectional drawing which show the formation process of the large diameter step part of the stepped hollow member of a prior art. 従来技術の段付中空部材の中心穴の成形工程を示す上面図及び断面図。The top view and sectional drawing which show the formation process of the center hole of the stepped hollow member of a prior art.

符号の説明Explanation of symbols

１…ブランク、２…中心穴、４…中空素材、５…中心穴、６…テーパ部、７…中間大径部、８…予備成形部材、９…中心穴、１０…大径段部、１１…段付中空部材、１２…溝、１３…円弧面、１５a…下部予備成型、１５ｂ…上部予備成形型、１５c…対向面、１５d…テーパ穴、１５e…対向面、１５ｆ…テーパ穴、１６…ナックルプレス機構（駆動装置）、１８…第１芯型、２０…抜取機構（抜き取り手段）、２３a…下部仕上げ成形型、２３b…上部仕上げ成形型、２３c…段部仕上げ面、２３d…下部仕上穴、２３e…段部仕上面、２３f…上部仕上穴、２４…第２芯型、３０a…下方円筒状端部、３０b…上方円筒状端部。
DESCRIPTION OF SYMBOLS 1 ... Blank, 2 ... Center hole, 4 ... Hollow material, 5 ... Center hole, 6 ... Tapered part, 7 ... Intermediate | middle large diameter part, 8 ... Pre-forming member, 9 ... Center hole, 10 ... Large diameter step part, 11 ... Stepped hollow member, 12 ... Groove, 13 ... Arc surface, 15a ... Lower preform, 15b ... Upper preform, 15c ... Opposite surface, 15d ... Taper hole, 15e ... Opposite surface, 15f ... Taper hole, 16 ... Knuckle press mechanism (drive device), 18 ... first core mold, 20 ... drawing mechanism (drawing means), 23a ... lower finish mold, 23b ... upper finish mold, 23c ... stepped surface, 23d ... lower finish hole , 23e: Stepped surface, 23f: Upper finishing hole, 24: Second core type, 30a: Lower cylindrical end, 30b: Upper cylindrical end.

Claims (4)

円筒状両端部の間に大径段部が突設され軸線上に断面が円と異なる異形穴が貫通された段付中空部材の製造方法において、
中空素材を前記異形穴に対応する断面形状を有する第１芯型に嵌挿し、
各対向面のうち少なくとも一方の対向面に開口するテーパ穴が形成されている一対の予備成形型を前記第１芯型を包囲して互いに接近させることにより、前記中空素材の少なくとも一方の端部を前記テーパ穴内周面で押圧するステップを１あるいは複数回行って、中空素材の外周面に前記中空素材の両端部から該両端部の間に向かって大径となるテーパ部を成形するとともに、中空素材の中心穴寸法が前記中空素材の両端に向かって漸減し、かつ前記第１芯型に向かって異形状に減少するように前記中空素材を予備仕上して予備成形部材とする予備成形工程と、
前記予備成形部材を前記第１芯型から抜き取り、前記異形穴に対応する断面形状を有する第２芯型に嵌挿し、
前記大径段部を両側から仕上げ成形する段部仕上げ面が夫々形成され、前記円筒状両端部の外径に夫々対応する内径の仕上穴が各段部仕上げ面に開口する一対の仕上げ成形型を、前記第２芯型を包囲して互いに接近させることにより、前記予備成形部材の前記テーパ部を前記各仕上穴及び段部仕上面で押圧して前記円筒状両端部及び大径段部を形成するとともに、前記第２芯型に押圧して前記中心穴を前記異形穴に形成する仕上げ成形工程とを有する段付中空部材の製造方法。 In the method of manufacturing a stepped hollow member in which a large-diameter stepped portion protrudes between both cylindrical ends and a deformed hole having a cross-section different from a circle on the axis is penetrated,
A hollow material is inserted into a first core mold having a cross-sectional shape corresponding to the deformed hole,
At least one end of the hollow material is formed by enclosing a pair of preforming dies in which tapered holes are formed in at least one of the opposing surfaces so as to surround the first core die and approach each other. And pressing the taper hole inner peripheral surface one or more times to form a tapered portion having a large diameter from both ends of the hollow material to the space between the both ends on the outer peripheral surface of the hollow material, A preforming step in which the hollow material is preliminarily finished to form a preformed member so that the center hole size of the hollow material gradually decreases toward both ends of the hollow material and decreases to an irregular shape toward the first core mold. When,
The preformed member is extracted from the first core mold, and is inserted into a second core mold having a cross-sectional shape corresponding to the deformed hole,
A pair of finish forming dies each having a step finish surface for finishing and molding the large-diameter step portion from both sides, each having a finish hole having an inner diameter corresponding to the outer diameter of each of the cylindrical end portions. By encircling the second core mold and approaching each other, the tapered portions of the preformed member are pressed by the finishing holes and the stepped surface, so that the cylindrical both end portions and the large diameter stepped portion are pressed. A method of manufacturing a stepped hollow member including forming and forming the center hole into the deformed hole by pressing against the second core mold. 前記仕上げ成形工程後において、
前記異形穴の角部に軸線方向に伸びる溝を形成するとともに内壁面を円柱形状に倣う円弧面に形成する工程を有する請求項１記載の段付中空部材の製造方法。 After the finish molding process,
The manufacturing method of the stepped hollow member of Claim 1 which has the process of forming in the corner | angular part of the said odd-shaped hole the groove | channel extended in an axial direction, and forming the inner wall surface in the circular arc surface which follows a column shape. 前記中空素材は、前記異形穴をほぼ相似形状に拡大した断面形状の中心穴を有する円筒形状とし、円柱状のブランクを鍛造加工して前記中空素材を成形することを特徴とする請求項１または請求項２記載の段付中空部材の製造方法。 The hollow material is formed into a cylindrical shape having a center hole having a cross-sectional shape obtained by enlarging the deformed hole into a substantially similar shape, and the hollow material is formed by forging a columnar blank. The manufacturing method of the stepped hollow member of Claim 2. 円筒状両端部の間に大径段部が突設され軸線上に断面が円と異なる異形穴が貫通された段付中空部材の製造装置において、
前記異形穴に対応する断面形状を有し、中空素材が嵌挿される第１芯型と、
各対向面のうち少なくとも一方の対向面に前記第１芯型を包囲するテーパ穴が開口する一対あるいは複数対の予備成形型であって、前記中空素材の端部を前記テーパ穴内周面で押圧して中空素材の外周面に前記中空素材の両端部から該両端部の間に向かって大径となるテーパ部を成形するとともに、中空素材の中心穴寸法が前記中空素材の両端に向かって漸減し、かつ前記第１芯型に向かって異形状に減少するように前記中空素材を予備成形部材に成形する１対あるいは複数対の予備成形型と、
両端部にテーパ部が成形された予備成形部材を前記第１芯型から抜き取る手段と、
前記異形穴に対応する断面形状を有し、前記予備成形部材が嵌挿される第２芯型と、
前記大径段部を両側から仕上げ成形する段部仕上げ面が夫々対向して形成され、かつ前記円筒状両端部の外径に夫々対応する内径の仕上穴が前記各段部仕上げ面に開口し、前記第２芯型を包囲して接離可能に装架された一対の仕上げ成形型であって、前記予備成形部材の前記テーパ部に前記各仕上穴及び段部仕上面を押圧させて前記円筒状両端部及び大径段部を成形するとともに、前記中心穴を前記第２芯型に押圧させて前記異形穴を形成する一対の仕上げ成形型とを有する段付中空部材の製造装置。
In the manufacturing apparatus of a stepped hollow member in which a large-diameter stepped portion is projected between both cylindrical end portions and a deformed hole having a cross-section different from a circle is penetrated on the axis line,
A first core type having a cross-sectional shape corresponding to the deformed hole, into which a hollow material is inserted,
A pair or a plurality of pairs of preforming dies in which a tapered hole surrounding the first core mold is opened on at least one of the opposing surfaces, and the end of the hollow material is pressed by the inner peripheral surface of the tapered hole In addition, a taper portion having a large diameter is formed on the outer peripheral surface of the hollow material from both ends of the hollow material, and the center hole size of the hollow material gradually decreases toward both ends of the hollow material. And a pair or a plurality of pairs of preforming molds for forming the hollow material into a preformed member so as to decrease in an irregular shape toward the first core mold,
Means for extracting from the first core mold a preformed member having tapered portions formed at both ends;
A second core mold having a cross-sectional shape corresponding to the deformed hole, and into which the preformed member is inserted;
Stepped finish surfaces for finishing and molding the large-diameter stepped portion from both sides are formed opposite to each other, and finish holes having inner diameters corresponding to the outer diameters of the cylindrical end portions open to the respective stepped finished surfaces. A pair of finish molds surrounding the second core mold so as to be able to come into contact with and separating from the second core mold, wherein the finishing holes and the stepped surface are pressed against the tapered portion of the preformed member. An apparatus for manufacturing a stepped hollow member having a pair of finish forming dies that form both cylindrical end portions and a large-diameter stepped portion and press the center hole against the second core die to form the deformed hole.
JP2004023966A 2004-01-30 2004-01-30 Method and apparatus for manufacturing stepped hollow member Expired - Fee Related JP4153880B2 (en)

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