JP2013237099A - Method of manufacturing molded product, die for manufacturing the molded product and device for manufacturing the molded product - Google Patents

Method of manufacturing molded product, die for manufacturing the molded product and device for manufacturing the molded product Download PDF

Info

Publication number
JP2013237099A
JP2013237099A JP2013014689A JP2013014689A JP2013237099A JP 2013237099 A JP2013237099 A JP 2013237099A JP 2013014689 A JP2013014689 A JP 2013014689A JP 2013014689 A JP2013014689 A JP 2013014689A JP 2013237099 A JP2013237099 A JP 2013237099A
Authority
JP
Japan
Prior art keywords
diameter
mold
molded
mandrel
molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2013014689A
Other languages
Japanese (ja)
Other versions
JP6102286B2 (en
Inventor
Hiroki Narumiya
洋輝 成宮
Masahiro Toda
正弘 戸田
Osamu Kada
修 加田
Original Assignee
Nippon Steel & Sumitomo Metal Corp
新日鐵住金株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2012094528 priority Critical
Priority to JP2012094528 priority
Application filed by Nippon Steel & Sumitomo Metal Corp, 新日鐵住金株式会社 filed Critical Nippon Steel & Sumitomo Metal Corp
Priority to JP2013014689A priority patent/JP6102286B2/en
Publication of JP2013237099A publication Critical patent/JP2013237099A/en
Application granted granted Critical
Publication of JP6102286B2 publication Critical patent/JP6102286B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a molded product excellent in die filling properties.SOLUTION: A mandrel 20 in which a large diameter part 20L, an intermediate diameter part 20M and a small diameter part 20S are formed in this order at two steps is used. The large diameter part 20L of the mandrel 20 is fitted into a through hole of a material W, and the material W is pressurized by punches 10, 40 and pushed into a molding space. While a load of the pressurization reaches a predetermined load and the material W within the molding space is pressurized with the predetermined load, the mandrel 20 is moved to switch the large diameter part 20L to the intermediate diameter part 20M, and a material flowing space is formed on the inner diameter part side of the material W within the molding space to promote a plastic flow. Then, when the material W occupies part of or all of the material flowing space due to the plastic flow, the mandrel 20 is moved again to switch the intermediate diameter part 20M to the small diameter part 20L, and the material flowing space is expanded or formed again to further promote the plastic flow.

Description

本発明は、貫通孔を有する金属素材、特に、鋼素材の外周部を寸法精度よく鍛造する成形品の製造方法、それに用いる金型、及び、該金型を備える装置に関する。   The present invention relates to a method for producing a molded product for forging a metal material having a through-hole, particularly a steel material with high dimensional accuracy, a mold used therefor, and an apparatus including the mold.
従来、例えば、歯車を製造する場合、熱間鍛造でギヤブランクを成形し、その後、ホブなどによる切削で歯形を創成する方法が一般的に用いられている。しかし、近年、歯車製造コストを低減することや、メタルフローを連続させて歯車の疲労強度を向上させることを目的として、切削工程を経ず、鍛造加工だけで歯車を製造する技術が注目されている(例えば、特許文献1〜3、参照)。   Conventionally, for example, when manufacturing a gear, a method of forming a gear blank by hot forging and then creating a tooth profile by cutting with a hob or the like is generally used. However, in recent years, attention has been paid to the technology for manufacturing gears only by forging, without cutting processes, in order to reduce gear manufacturing costs and improve the fatigue strength of gears by continuing metal flow. (For example, refer to Patent Documents 1 to 3).
密閉鍛造や閉塞鍛造(以下単に「鍛造加工」という。)で歯車を製造する場合、素材を金型内に過不足なく押し込む必要があるが、素材が金型を満たす程度(以下「型充満度」ということがある。)を上げるため成形荷重を増大すると、金型への負荷が上昇して金型が破損するので、素材成形部の型充満度の向上には限界がある。   When manufacturing gears by closed forging or closed forging (hereinafter simply referred to as “forging”), it is necessary to push the material into the mold without excess or deficiency, but to the extent that the material satisfies the mold (hereinafter referred to as “die filling degree”). If the molding load is increased to increase the load, the load on the mold is increased and the mold is damaged, so there is a limit to the improvement of the mold filling degree of the material molding portion.
非特許文献1には、貫通孔のない素材の鍛造加工において、成形途中で素材を取り出して中心部に貫通孔を形成し、成形荷重の増加を伴うことなく成形を継続して、素材成形部の型充満度を高める画期的な成形方法が開示されている。しかし、この成形方法は、成形途中の素材を、一度、取り出して加工(中心部に貫通孔を形成)し、再度、成形を行うので、生産性が悪く実用的でない。   In Non-Patent Document 1, in the forging process of a material having no through-hole, the material is taken out during forming, a through-hole is formed in the center, and molding is continued without increasing the molding load. An epoch-making molding method for increasing the degree of mold filling is disclosed. However, this molding method is not practical because of poor productivity because the material in the middle of molding is once taken out and processed (a through hole is formed in the center) and then molded again.
特許文献4には、非特許文献1記載の成形方法を踏まえ、素材成形部の型充満度を維持しつつ、大径部と小径部を有するマンドレルを用いて、成形途中で、素材内径側に空間を設け、複雑形状の部品でもパンチの加圧力を過大にすることなく、高精度の部品を安定して成形する加工方法が開示されている。この加工方法は、生産性に優れているが、素材成形部に、素材が型を満たさない未充満部が依然として残るという課題を抱えている。   In Patent Document 4, based on the molding method described in Non-Patent Document 1, while maintaining the mold filling degree of the material molded part, using a mandrel having a large diameter part and a small diameter part, A processing method is disclosed in which a space is provided and a highly accurate part is stably formed without excessively applying a punch pressure even for a complicatedly shaped part. This processing method is excellent in productivity, but has a problem that an unfilled portion where the material does not satisfy the mold still remains in the material molding portion.
特開2011−121100号公報JP 2011-121100 A 特開2011−016162号公報JP 2011-016162 A 特開2006−181589号公報JP 2006-181589 A 特開平07−284875号公報JP 07-284875 A
素材を鍛造加工で成形する場合、成形荷重が低いと、金型の弾性変形量が減少して成形品の寸法精度が向上し、また、金型に対する負荷が減少して金型寿命が向上するので、成形荷重は低い方が好ましい。   When forming a material by forging, if the molding load is low, the amount of elastic deformation of the mold is reduced and the dimensional accuracy of the molded product is improved, and the load on the mold is reduced and the mold life is improved. Therefore, it is preferable that the molding load is low.
本発明は、素材、特に、鋼素材を鍛造加工で成形する方法において、成形荷重を増大することなく素材を金型に押し込んで、素材が金型を満たさない未充満部(以下「型未充満部」ということがある。)が生じないように成形すること、即ち、鍛造加工において型充満性を向上させることを課題とし、該課題を解決する成形品の製造方法、該方法に用いる成形品製造用金型、及び、該金型を備える成形品製造装置を提供することを目的とする。   The present invention relates to a method for forming a material, particularly a steel material by forging, by pushing the material into the mold without increasing the molding load, and the unfilled portion where the material does not fill the mold (hereinafter referred to as “mold unfilled”). Part ”.), That is, to improve mold filling in forging, and a method for producing a molded product that solves the problem, and a molded product used in the method An object of the present invention is to provide a manufacturing mold and a molded product manufacturing apparatus including the mold.
本発明者らは、特許文献4に開示の加工方法では、素材の塑性流動が不十分で、上下の金型を組み合せて形成する成形空間に型未充満部が生じ、素材の型充満性に劣る原因を鋭意調査した。その結果、その原因が、金型が形成する成形空間の形態、及び、成形に用いるマンドレルの形状・構造にあることを解明した。   In the processing method disclosed in Patent Document 4, the inventors have insufficient plastic flow of the material, and a mold unfilled portion is formed in a molding space formed by combining upper and lower molds. Investigated the cause of inferiority. As a result, it was clarified that the cause is the shape of the molding space formed by the mold and the shape and structure of the mandrel used for molding.
そして、本発明者らは、素材の塑性流動が充分に生じ、金型内に型未充満部が生じない成形空間の形態、及び、マンドレルの形状・構造について鋭意研究した。   The present inventors have intensively studied the form of the molding space where the plastic flow of the material is sufficiently generated and no unfilled part is formed in the mold, and the shape and structure of the mandrel.
その結果、素材の鍛造加工、特に、環状素材の鍛造加工において、二つの段差で、大径部、中径部、及び、小径部を、この順序で形成したマンドレルを用い、素材の変形の進行に伴いマンドレルを移動し、大径部、中径部、小径部で、順次、成形途中の素材を保持して鍛造加工すると、素材の型充満度が顕著に向上すること、さらに、成形品の内径部における折込み(疵)が顕著に減少することが判明した。   As a result, in the forging process of the material, in particular, the forging process of the annular material, the progress of the deformation of the material using a mandrel in which the large diameter part, the medium diameter part, and the small diameter part are formed in this order at two steps. As the mandrel is moved along with the large diameter part, medium diameter part, and small diameter part in order to hold the raw material in the middle of molding and forging, the mold filling degree of the material is remarkably improved. It was found that the folds (creases) in the inner diameter portion were significantly reduced.
本発明は、上記知見に基づいてなされたもので、その要旨は次の通りである。   The present invention has been made based on the above findings, and the gist thereof is as follows.
(1)貫通孔を有する素材を、貫通孔に嵌装したマンドレルと、該素材を加圧するパンチの協働で、金型の成形空間に押し込み、上記素材の外周部を部品形状に成形する成形品の製造方法において、
(x)二つの段差で、大径部、中径部、及び、小径部を、この順序で形成したマンドレルを用い、
(y)上記マンドレルの大径部を素材の貫通孔に嵌装し、該素材を、パンチで加圧して、金型の成形空間に押し込み、
(z)上記加圧荷重が所定の荷重に達し、金型の成形空間内の素材が所定の荷重で加圧されている状態で、
(z1)マンドレルを移動させて、素材を保持する大径部を中径部に替え、金型の成形空間内の素材の内径部側に素材流動空間を形成して、素材の塑性流動を促し、次いで、
(z2)上記素材の塑性流動により、素材が素材流動空間の一部又は全部を占有したとき、さらに、再度、マンドレルを移動させて、素材を保持する中径部を小径部に替え、上記素材流動空間を拡大又は再形成し、さらに、素材の塑性流動を促す
ことを特徴とする成形品の製造方法。
(1) Molding in which a material having a through hole is pressed into a molding space of a mold by the cooperation of a mandrel fitted in the through hole and a punch for pressurizing the material, and the outer periphery of the material is molded into a part shape. In the manufacturing method of goods,
(X) Using a mandrel formed with two steps, a large diameter portion, a medium diameter portion, and a small diameter portion in this order,
(Y) The large-diameter portion of the mandrel is fitted into the through-hole of the material, the material is pressed with a punch and pushed into the molding space of the mold,
(Z) In a state where the pressurization load reaches a predetermined load and the material in the molding space of the mold is pressed with the predetermined load,
(Z1) Move the mandrel to change the large diameter part holding the material to the medium diameter part and form the material flow space on the inner diameter part side of the material in the molding space of the mold to promote the plastic flow of the material Then
(Z2) When the material occupies part or all of the material flow space due to the plastic flow of the material, the mandrel is moved again to change the medium diameter part holding the material to the small diameter part, and the material A method for producing a molded article, characterized by enlarging or reshaping the fluid space and further promoting plastic flow of the material.
(2)前記素材が鋼素材であることを特徴とする前記(1)に記載の成形品の製造方法。   (2) The method for producing a molded article according to (1), wherein the material is a steel material.
(3)前記部品形状が歯車形状であることを特徴とする前記(1)又は(2)に記載の成形品の製造方法。   (3) The method for producing a molded article according to (1) or (2), wherein the part shape is a gear shape.
(4)貫通孔を有する素材を、貫通孔に嵌装したマンドレルと協働して、該素材を成形空間に押し込んで、上記素材の外周部を部品形状に成形する成形品製造用金型であって、該金型の中心部にて、
(x)二つの段差で、大径部、中径部、及び、小径部が、この順序で先端に向かい形成されているマンドレルを上下動可能に内包する
ことを特徴とする成形品製造用金型。
(4) A mold for manufacturing a molded product, in which a material having a through hole is pressed into a molding space in cooperation with a mandrel fitted in the through hole, and the outer periphery of the material is molded into a part shape. At the center of the mold,
(X) Molded article manufacturing gold characterized by including a mandrel formed with two steps so that the large diameter part, the medium diameter part, and the small diameter part are formed toward the tip in this order so as to be movable up and down. Type.
(5)貫通孔を有する素材を、貫通孔に嵌装したマンドレルと協働して、該素材を成形空間に押し込んで、上記素材の外周部を部品形状に成形する成形品製造用金型であって、該金型の中心部にて、
(x1)二つの段差で、大径部、中径部、及び、小径部が、この順序で先端に向かい形成されていて、かつ、(x2)上記大径部の直径d1、中径部の直径d2、及び、小径部の直径d3が、下記式(1)及び(2)を満たすマンドレルを上下動可能に内包する
ことを特徴とする成形品製造用金型。
0.01×d1≦d1−d2≦0.1×d1 ・・・(1)
0.01×d1≦d2−d3≦0.1×d1 ・・・(2)
(6)前記部品形状が歯車形状であることを特徴とする前記(4)又は(5)に記載の成形品製造用金型。
(5) A mold for manufacturing a molded product, in which a material having a through hole is pressed into a molding space in cooperation with a mandrel fitted in the through hole, and the outer periphery of the material is molded into a part shape. At the center of the mold,
(X1) The two steps are formed such that the large diameter portion, the medium diameter portion, and the small diameter portion are formed toward the tip in this order, and (x2) the diameter d1 of the large diameter portion, A mold for manufacturing a molded product, characterized in that a mandrel satisfying the following formulas (1) and (2) is included so that the diameter d2 and the diameter d3 of the small diameter portion can be moved up and down.
0.01 × d1 ≦ d1−d2 ≦ 0.1 × d1 (1)
0.01 × d1 ≦ d2−d3 ≦ 0.1 × d1 (2)
(6) The mold for manufacturing a molded article according to (4) or (5), wherein the part shape is a gear shape.
(7)前記(4)〜(6)のいずれかに記載の成形品製造用金型と、該金型に対向する位置に、貫通孔を有する素材を収容し、該素材の外周部を部品形状に成形する成形空間を有する成形品製造用金型を備えることを特徴とする成形品製造装置。   (7) The mold for manufacturing a molded article according to any one of (4) to (6) above, and a material having a through hole at a position facing the mold, and the outer peripheral portion of the material being a component A molded product manufacturing apparatus comprising a mold for manufacturing a molded product having a molding space for molding into a shape.
(8)前記部品形状が歯車形状であることを特徴とする前記(7)に記載の成形品製造装置。   (8) The molded product manufacturing apparatus according to (7), wherein the part shape is a gear shape.
本発明によれば、環状素材の鍛造加工において、パンチとマンドレルの協働で、成形荷重を増大することなく、成形途中の素材に塑性流動を2度生じさせるので、鍛造加工における型充満度が顕著に向上し、寸法精度の優れた成形品を製造することができる。   According to the present invention, in the forging process of the annular material, since the plastic flow is generated twice in the material during the molding without increasing the molding load by the cooperation of the punch and the mandrel, the mold filling degree in the forging process is increased. It is possible to manufacture a molded product that is remarkably improved and has excellent dimensional accuracy.
本発明の成形品製造装置の一態様を示す図である。(a)は、中心部に、直径d1の大径部、直径d2の中径部、及び、直径d3の小径部を有するマンドレルを上下動可能に内包し、油圧シリンダー(図示なし)で上下動するメインパンチ(上金型)を示し、(b)は、環状素材Wを支えるカウンターパンチ、環状素材Wを収容するコンテナ部、及び、環状素材Wの外周部を成形する成形部を有し、閉塞油圧ユニットによって荷重が負荷されるフローティングダイ(下金型)を示す。It is a figure which shows the one aspect | mode of the molded article manufacturing apparatus of this invention. (A) includes a mandrel having a large-diameter portion with a diameter d 1 , a medium-diameter portion with a diameter d 2 , and a small-diameter portion with a diameter d 3 in a central portion so as to be movable up and down, and a hydraulic cylinder (not shown) (B) shows a counter punch that supports the annular material W, a container part that accommodates the annular material W, and a molding part that molds the outer periphery of the annular material W. It shows a floating die (lower mold) that has a load by a closed hydraulic unit. 本発明の成形品製造装置において、上下の金型を閉じ、環状素材Wの成形を開始する直前の状態を示す図である。In the molded product manufacturing apparatus of this invention, it is a figure which shows the state immediately before starting the shaping | molding of the cyclic | annular raw material W, closing an upper and lower metal mold | die. 本発明の成形品製造装置における第二段階の成形(鍛造)態様を示す図である。(a)は、第一段階の成形(鍛造)が終了した状態を示し、(b)は、マンドレルの大径部を上昇させ、第二段階の成形(鍛造)を行なっている状態を示し、(c)は、第二段階の成形(鍛造)が終了しつつある状態を示す。It is a figure which shows the shaping | molding (forging) aspect of the 2nd step in the molded article manufacturing apparatus of this invention. (A) shows a state where the first stage of molding (forging) has been completed, (b) shows a state where the large-diameter portion of the mandrel is raised and the second stage of molding (forging) is performed, (C) shows a state where the second stage of molding (forging) is being completed. 本発明の成形品製造装置における第三段階の成形(鍛造)態様を示す図である。(a)は、マンドレルの中径部を上昇させ、第三段階の成形(鍛造)を行なっている状態を示し、(b)は、第三段階の成形(鍛造)が終了しつつある状態を示し、(c)は、第三段階の成形(鍛造)が終了した状態を示す。It is a figure which shows the shaping | molding (forging) aspect of the 3rd step in the molded article manufacturing apparatus of this invention. (A) shows the state where the middle diameter portion of the mandrel is raised and the third stage of molding (forging) is performed, and (b) shows the state where the third stage of molding (forging) is being completed. (C) shows the state in which the third stage of molding (forging) has been completed. メインパンチのストロークと成形荷重の関係を模式的に示す図である。It is a figure which shows typically the relationship between the stroke of a main punch, and a forming load. 成形品の一態様を示す図である。It is a figure which shows the one aspect | mode of a molded article. 実施例で用いたマンドレルの態様を示す図である。(a)は、従来装置が備えるマンドレルの態様を示し、(b)は、本発明の成形品製造装置が備えるマンドレルの態様を示す。It is a figure which shows the aspect of the mandrel used in the Example. (A) shows the mode of the mandrel with which a conventional apparatus is equipped, (b) shows the mode of the mandrel with which the molded article manufacturing apparatus of this invention is equipped. 歯先充満率の定義を示す図である。It is a figure which shows the definition of a tooth tip filling rate. マンドレルの直径変化量の総和d[mm]と歯先充満率bc/b[%]の関係を示す図である。Is a diagram showing the relationship of the sum of the diameter variation of mandrel d [mm] and addendum filling ratio b c / b [%]. 貫通孔を有する非軸対称の部品形状例を示す図である。It is a figure which shows the example of non-axisymmetric component shape which has a through-hole. 貫通孔を有する非回転対称の部品形状例を示す図である。It is a figure which shows the example of non-rotationally symmetrical component shape which has a through-hole.
本発明の成形品の製造方法(以下「本発明方法」ということがある。)は、貫通孔を有する素材を、貫通孔に嵌装したマンドレルと、該素材を加圧するパンチの協働で、金型の成形空間に押し込み、上記素材の外周部を部品形状に成形する成形品の製造方法において、(x)二つの段差で、大径部、中径部、及び、小径部を、この順序で形成したマンドレルを用い、
(y)上記マンドレルの大径部を素材の貫通孔に嵌装し、該素材を、パンチで加圧して、金型の成形空間に押し込み、
(z)上記加圧荷重が所定の荷重に達し、金型の成形空間内の素材が所定の荷重で加圧されている状態で、
(z1)マンドレルを移動させて、素材を保持する大径部を中径部に替え、金型の成形空間内の素材の内径部側に素材流動空間を形成して、素材の塑性流動を促し、次いで、
(z2)上記素材の塑性流動により、素材が素材流動空間の一部又は全部を占有したとき、さらに、再度、マンドレルを移動させて、素材を保持する中径部を小径部に替え、上記素材流動空間を拡大又は再形成して、さらに、素材の塑性流動を促す
ことを特徴とする。
The method for producing a molded article of the present invention (hereinafter sometimes referred to as “method of the present invention”) includes the cooperation of a mandrel fitted with a material having a through hole and a punch for pressurizing the material. In the manufacturing method of a molded product that is pressed into the molding space of the mold and the outer peripheral portion of the material is molded into a part shape, (x) the large diameter portion, the medium diameter portion, and the small diameter portion are arranged in this order at two steps. Using the mandrel formed in
(Y) The large-diameter portion of the mandrel is fitted into the through-hole of the material, the material is pressed with a punch and pushed into the molding space of the mold,
(Z) In a state where the pressurization load reaches a predetermined load and the material in the molding space of the mold is pressed with the predetermined load,
(Z1) Move the mandrel to change the large diameter part holding the material to the medium diameter part and form the material flow space on the inner diameter part side of the material in the molding space of the mold to promote the plastic flow of the material Then
(Z2) When the material occupies part or all of the material flow space due to the plastic flow of the material, the mandrel is moved again to change the medium diameter part holding the material to the small diameter part, and the material The flow space is enlarged or reformed, and further, plastic flow of the material is promoted.
本発明の成形品製造用金型(以下「本発明金型」ということがある。)は、貫通孔を有する素材を、貫通孔に嵌装したマンドレルと協働して、該素材を成形空間に押し込んで、上記素材の外周部を部品形状に成形する成形品製造用金型であって、該金型の中心部にて、(x)二つの段差で、大径部、中径部、及び、小径部が、この順序で先端に向かい形成されているマンドレルを上下動可能に内包する
ことを特徴とする。
The mold for manufacturing a molded article of the present invention (hereinafter sometimes referred to as “the mold of the present invention”) cooperates with a mandrel in which a material having a through hole is fitted into the through hole, and the material is formed into a molding space. A mold for manufacturing a molded product in which the outer peripheral portion of the material is molded into a part shape, and at the center of the mold, (x) two steps, a large diameter portion, a medium diameter portion, The small-diameter portion includes a mandrel formed in this order so as to face the tip so as to be movable up and down.
また、本発明金型は、貫通孔を有する素材を、貫通孔に嵌装したマンドレルと協働して、該素材を成形空間に押し込んで、上記素材の外周部を部品形状に成形する成形品製造用金型であって、該金型の中心部にて、(x1)二つの段差で、大径部、中径部、及び、小径部が、この順序で先端に向かい形成されていて、かつ、(x2)上記大径部の直径d1、中径部の直径d2、及び、小径部の直径d3が、下記式(1)及び(2)を満たすマンドレルを上下動可能に内包する
ことを特徴とする。
In addition, the mold of the present invention is a molded product in which a material having a through hole is pressed into a molding space in cooperation with a mandrel fitted in the through hole, and the outer peripheral portion of the material is molded into a part shape. A mold for manufacturing, and at the center of the mold, (x1) two steps, a large diameter portion, a medium diameter portion, and a small diameter portion are formed in this order toward the tip, And (x2) the diameter d1 of the large diameter part, the diameter d2 of the medium diameter part, and the diameter d3 of the small diameter part include a mandrel satisfying the following formulas (1) and (2) so as to be movable up and down. Features.
0.01×d1≦d1−d2≦0.1×d1 ・・・(1)
0.01×d1≦d2−d3≦0.1×d1 ・・・(2)
0.01 × d1 ≦ d1−d2 ≦ 0.1 × d1 (1)
0.01 × d1 ≦ d2−d3 ≦ 0.1 × d1 (2)
さらに、本発明の成形品製造装置(以下「本発明装置」ということがある。)は、本発明金型と、本発明金型に対向する位置に、貫通孔を有する素材を収容し、該素材の外周部を部品形状に成形する成形空間(コンテナ部)を有する金型を備えることを特徴とする。   Furthermore, the molded product manufacturing apparatus of the present invention (hereinafter sometimes referred to as “the present invention apparatus”) accommodates the mold of the present invention and a material having a through hole at a position facing the mold of the present invention. It comprises a mold having a molding space (container part) for molding the outer peripheral part of the material into a part shape.
本発明は、非特許文献1に記載の成形原理を実際の冷間鍛造加工に応用し、型充満度の高い冷間鍛造加工を実現するものである。   The present invention applies the forming principle described in Non-Patent Document 1 to actual cold forging and realizes cold forging with a high degree of die filling.
技術的には、貫通孔を有する素材の貫通孔に嵌装し、鍛造加工中、該素材を保持するマンドレルに、二つの段差で、大径部、中径部、及び、小径部を、この順序で先端に向かって形成し、マンドレルの移動で、金型内の素材の内径側に、順次、該素材の塑性流動を促す空間(以下「素材流動空間」ということがある。)を設けることで、成形途中で塑性流動を2回促し、素材の型充満度を顕著に高めることを基本思想とする。   Technically, a mandrel that is fitted into a through-hole of a material having a through-hole, and holds the material during forging, has two steps, a large-diameter portion, a medium-diameter portion, and a small-diameter portion. Formed in order toward the tip, and by moving the mandrel, a space (hereinafter also referred to as “material flow space”) that promotes plastic flow of the material in order is provided on the inner diameter side of the material in the mold. Therefore, the basic idea is to promote plastic flow twice in the middle of molding to remarkably increase the mold filling degree of the material.
素材流動空間は、素材と接触するマンドレルの外径が減少する(大径部から中径部に、中径部から小径部に替える。)ことによって形成される、素材が充満していない空間である。   The material flow space is a space where the material is not filled, which is formed when the outer diameter of the mandrel in contact with the material decreases (from the large diameter part to the medium diameter part, and from the medium diameter part to the small diameter part). is there.
本発明の成形対象素材は、鍛造可能な金属素材であればよく、特定の金属素材に限定されないが、本発明の効果は、他の金属材料に比較して強度が高く、冷間鍛造が難しい鋼素材の場合に顕著である。それ故、本発明の成形対象素材は、鋼素材が好ましい。本発明の成形対象素材を鍛造加工する際の素材温度は、所望の型充満度を確保できる限りで、特定の温度に限定されない。   The material to be molded of the present invention may be a metal material that can be forged, and is not limited to a specific metal material. However, the effects of the present invention are higher in strength than other metal materials, and cold forging is difficult. This is especially true for steel materials. Therefore, the material to be molded of the present invention is preferably a steel material. The material temperature at the time of forging the forming object material of the present invention is not limited to a specific temperature as long as a desired mold filling degree can be ensured.
素材を鍛造加工する本発明金型の温度は、所望の型充満度を確保できる限りで、特定の温度に限定されない。   The temperature of the mold of the present invention for forging the material is not limited to a specific temperature as long as a desired mold filling degree can be secured.
本発明方法、本発明金型、又は、本発明装置で製造する部品形状は、貫通孔を有し、鍛造加工で成形できる形状、又は、これに類似する部品形状であればよく、特定の部品形状に限定されない。特に、円環状の部品形状、軸対称又は回転対称の部品形状が好ましいが、例えば、図10に例示する“貫通孔を有する非軸対称の部品形状”でもよく、また、図11に例示する“貫通孔を有する非回転対称の部品形状”でもよい。   The part shape produced by the method of the present invention, the mold of the present invention, or the apparatus of the present invention may be any shape that has a through hole and can be formed by forging, or a similar part shape. The shape is not limited. In particular, an annular part shape, an axially symmetric or rotationally symmetric part shape is preferable, but, for example, the “non-axisymmetric part shape having a through hole” illustrated in FIG. 10 may be used. It may be a “non-rotationally symmetric part shape having a through hole”.
成形対象素材の形状は、製造する部品形状に倣った形状とする。部品形状が軸対称又は回転対称であれば、素材の中央部に貫通孔を形成する。部品形状が、例えば、非軸対称(図10、参照)や、非回転対称(図11、参照)の場合、貫通孔の位置は、所要の塑性流動を生起し、所望の型充満度を得る観点から、適宜設定する。   The shape of the material to be molded is a shape that follows the shape of the part to be manufactured. If the part shape is axially symmetric or rotationally symmetric, a through hole is formed in the center of the material. When the part shape is, for example, non-axisymmetric (see FIG. 10) or non-rotationally symmetric (see FIG. 11), the position of the through hole causes a required plastic flow and obtains a desired mold filling degree. Set appropriately from the viewpoint.
本発明方法、本発明金型、又は、本発明装置は、例えば、中央部に貫通孔を有する環状の鋼素材を、各種の歯車形状、例えば、プラネタリピニオンギヤ、プラネタリサンギヤ等の歯車形状に成形するのに好適である。   The method of the present invention, the mold of the present invention, or the device of the present invention, for example, forms an annular steel material having a through hole in the central portion into various gear shapes, for example, gear shapes such as planetary pinion gears and planetary sun gears. It is suitable for.
以下、図面に基づいて詳細に説明する。   Hereinafter, it demonstrates in detail based on drawing.
まず、図1に、本発明装置の一態様を示す。図1(a)に、マンドレル20を中心部に上下動可能に内包するメインパンチ10を示し、図1(b)に、カウンターパンチ40、素材Wを挿入するコンテナ部32、及び、環状素材Wの外周部を成形する高さhの成形部31を有するフローティングダイ30を示す。フローティングダイ30には、油圧ユニット33によって荷重が負荷され、メインパンチ10に押し付けられる。   First, FIG. 1 shows one embodiment of the device of the present invention. FIG. 1A shows a main punch 10 that encloses a mandrel 20 so as to be movable up and down, and FIG. 1B shows a counter punch 40, a container portion 32 into which a material W is inserted, and an annular material W. The floating die 30 which has the shaping part 31 of the height h which shape | molds the outer peripheral part of this is shown. A load is applied to the floating die 30 by the hydraulic unit 33 and is pressed against the main punch 10.
図1(a)に示すように、油圧シリンダー(図示なし)で上下動するメインパンチ10(上金型)は、直径d1の大径部20L、直径d2の中径部20M、及び、直径d3の小径部20Sを有するマンドレル20を上下動可能に内包する。図1(b)に示すように、フローティングダイ30は、環状素材Wを支えるカウンターパンチ40、環状素材Wを収容するコンテナ部32、及び、環状素材Wの外周部を成形する、高さhの成形部31を備えている。   As shown in FIG. 1 (a), a main punch 10 (upper mold) that moves up and down by a hydraulic cylinder (not shown) includes a large diameter portion 20L having a diameter d1, a middle diameter portion 20M having a diameter d2, and a diameter d3. A mandrel 20 having a small diameter portion 20S is included so as to be movable up and down. As shown in FIG. 1B, the floating die 30 has a height h for forming the counter punch 40 that supports the annular material W, the container portion 32 that accommodates the annular material W, and the outer periphery of the annular material W. A molding part 31 is provided.
マンドレル20には、第一段差21と第二段差22により、大径部20L、中径部20M、及び、小径部20Sが形成されている。この点が、本発明金型の特徴である。第一段差21と第二段差22は、マンドレル20の軸に垂直な面で形成してもよいし、該軸に斜めの斜面で形成してもよい。斜面の傾斜角は、所要の大きさの素材流動空間を確保できる角度であればよい。   The mandrel 20 is formed with a large diameter portion 20L, a medium diameter portion 20M, and a small diameter portion 20S by a first step 21 and a second step 22. This is a feature of the mold of the present invention. The first step 21 and the second step 22 may be formed with a plane perpendicular to the axis of the mandrel 20, or may be formed with an oblique slope on the axis. The inclination angle of the slope may be an angle that can secure a material flow space of a required size.
大径部20L、中径部20M、及び、小径部20Sの長さは、素材の寸法・形状、又は、成形品の寸法・形状を考慮して適宜設定する。特に、中径部20Mの長さLは、短いと成形品の厚さを受容できず、また、長いとマンドレル20の移動に時間を要する。中径部20Mの長さLは、これらの点を考慮して、適宜設定する。   The lengths of the large-diameter portion 20L, the medium-diameter portion 20M, and the small-diameter portion 20S are appropriately set in consideration of the size / shape of the material or the size / shape of the molded product. In particular, if the length L of the medium diameter portion 20M is short, the thickness of the molded product cannot be accepted, and if it is long, it takes time to move the mandrel 20. The length L of the medium diameter portion 20M is appropriately set in consideration of these points.
マンドレル20は、メインパンチ10及びフローティングダイ30と協働して行う鍛造加工において、環状素材の内径部側に、環状素材の塑性流動を促す空間(素材流動空間)を形成し、さらに、該空間を拡大又は再形成して、環状素材Wの塑性流動を促し、型充満性を高めるという重要な役割を担う。この点については後述する。   In the forging process performed in cooperation with the main punch 10 and the floating die 30, the mandrel 20 forms a space (material flow space) that promotes plastic flow of the annular material on the inner diameter side of the annular material. Is expanded or reformed to promote the plastic flow of the annular material W and to play an important role of enhancing the mold filling property. This point will be described later.
図1に示す本発明装置においては、環状素材Wが、フローティングダイ30のコンテナ部32において、カウンターパンチ40の上に載置されていて、環状素材Wの成形を開始しようとする状態にある(図1(b)、参照)。本発明方法によれば、環状素材Wは、以下に説明する第一段階、第二段階、及び、第三段階を経て、成形品に製造されることが特徴である。   In the apparatus of the present invention shown in FIG. 1, the annular material W is placed on the counter punch 40 in the container portion 32 of the floating die 30, and is ready to start forming the annular material W ( See FIG. 1 (b). According to the method of the present invention, the annular material W is characterized by being manufactured into a molded product through the first stage, the second stage, and the third stage described below.
図2に、本発明装置において、上下の金型を閉じ、環状素材Wの成形を開始する直前の状態を示す。環状素材Wを成形するため、メインパンチ10とマンドレル20を下降させ、さらに、マンドレル20を下降させ、マンドレル20の段差21をカウンターパンチ40の上面(即ち、環状素材Wの下端)に位置させる。   FIG. 2 shows a state immediately before the upper and lower molds are closed and molding of the annular material W is started in the apparatus of the present invention. In order to form the annular material W, the main punch 10 and the mandrel 20 are lowered, the mandrel 20 is further lowered, and the step 21 of the mandrel 20 is positioned on the upper surface of the counter punch 40 (that is, the lower end of the annular material W).
即ち、環状素材Wの貫通孔に、マンドレル20の大径部20Lを嵌装する。その後、メインパンチ10を下降させ、フローティングダイ30を押し下げながら、環状素材Wを塑性変形させる。   That is, the large diameter portion 20 </ b> L of the mandrel 20 is fitted into the through hole of the annular material W. Thereafter, the main punch 10 is lowered and the annular material W is plastically deformed while the floating die 30 is pushed down.
環状素材Wの塑性変形が進行し、環状素材Wが高さhの成形部31へ塑性流動し、成形部31の充満率が高まるのに伴い、メインパンチ10にかかる荷重が増加する。荷重が設定値に達すると、設定値を超える荷重は、メインパンチ10に負荷されなくなり、設定値に維持された状態で塑性変形(成形)の第一段階が終了する。この段階では、成形部31内に、環状素材Wで満たされていない未充満部が存在している。   As the plastic deformation of the annular material W proceeds, the annular material W plastically flows to the molding part 31 having the height h, and the filling rate of the molding part 31 increases, the load applied to the main punch 10 increases. When the load reaches the set value, the load exceeding the set value is no longer applied to the main punch 10, and the first stage of plastic deformation (molding) ends with the load maintained at the set value. At this stage, an unfilled portion that is not filled with the annular material W exists in the molding portion 31.
ここで、第一段階の成形に続く、第二段階の成形の態様、及び、第三段階の成形の態様を、それぞれ、図3、及び、図4に示す。   Here, the second-stage molding mode and the third-stage molding mode following the first-stage molding are shown in FIGS. 3 and 4, respectively.
図3に、本発明装置における第二段階の成形(鍛造)態様を示す。図3(a)に、第一段階の成形(鍛造)が終了した状態を示し、図3(b)に、マンドレルの大径部を上昇させ、第二段階の成形(鍛造)を行っている状態を示す。そして、図3(c)に、第二段階の成形(鍛造)が終了しつつある状態を示す。   FIG. 3 shows a second stage of forming (forging) in the apparatus of the present invention. FIG. 3A shows a state where the first stage of molding (forging) has been completed, and FIG. 3B shows that the large-diameter portion of the mandrel is raised to perform the second stage of molding (forging). Indicates the state. FIG. 3C shows a state where the second stage of molding (forging) is being completed.
図3(a)に示すように、上金型41と下金型42で形成する成形空間43には、成形素材W’が充満していない未充満部T1が存在する。   As shown in FIG. 3A, the molding space 43 formed by the upper mold 41 and the lower mold 42 has an unfilled portion T1 that is not filled with the molding material W '.
そこで、成形(鍛造)の第二段階では、図3(b)及び(c)に示すように、上金型41に一定荷重Pが負荷されている状態で、マンドレル20を上昇させて、成形素材W’を内径部側から保持する大径部20Lを中径部20Mに替えていく。   Therefore, in the second stage of molding (forging), as shown in FIGS. 3B and 3C, the mandrel 20 is raised while the constant load P is applied to the upper mold 41, and molding is performed. The large diameter portion 20L that holds the material W ′ from the inner diameter side is replaced with the middle diameter portion 20M.
大径部20Lを中径部20Mに替えることにより、成形素材W’の内径部側に、素材の塑性流動を促す素材流動空間S1、S2を形成する。素材流動空間S1、S2の形成により、成形素材W’の未充満部T1と素材流動空間S1への塑性流動が促進され(図3(b)中、成形素材W’内の矢印、参照)、さらに、成形素材W’の未充満部T2と素材流動空間S2への塑性流動が促進される(図3(c)中、成形素材W’内の矢印、参照)。   By replacing the large diameter portion 20L with the medium diameter portion 20M, material flow spaces S1 and S2 that promote plastic flow of the material are formed on the inner diameter side of the molding material W ′. The formation of the material flow spaces S1 and S2 promotes plastic flow to the unfilled portion T1 of the molding material W ′ and the material flow space S1 (see the arrow in the molding material W ′ in FIG. 3B). Furthermore, plastic flow to the unfilled portion T2 of the molding material W ′ and the material flow space S2 is promoted (see the arrow in the molding material W ′ in FIG. 3C).
素材流動空間S1、S2は、成形素材W’が充満していない空間であって、マンドレル20の上昇に伴って上方に移動し、鍛造の進行に伴って、メインパンチは下方に移動する。これが、成形素材W’に対する1回目の鍛造である。   The material flow spaces S1 and S2 are spaces that are not filled with the molding material W ', and move upward as the mandrel 20 rises, and the main punch moves downward as the forging progresses. This is the first forging of the molding material W ′.
図4に、本発明装置における第三段階の成形(鍛造)態様を示す。図4(a)に、マンドレルの中径部を上昇させ、第三段階の成形(鍛造)を行なっている状態を示し、図4(b)に、第三段階の成形(鍛造)が終了しつつある状態を示し、図4(c)に、第三段階の成形(鍛造)が終了した状態を示す。   FIG. 4 shows a third stage of forming (forging) in the apparatus of the present invention. FIG. 4 (a) shows a state where the middle diameter portion of the mandrel is raised and the third stage of molding (forging) is performed, and FIG. 4 (b) shows the completion of the third stage of molding (forging). FIG. 4C shows a state where the third stage of molding (forging) is completed.
第三段階の成形(鍛造)では、図4(a)及び(b)に示すように、金型41に一定の荷重Pが負荷されている状態で、マンドレル20を上昇させて、成形素材W’を内径部側から保持する中径部20Mを小径部20Sに替えていく。   In the third stage of molding (forging), as shown in FIGS. 4A and 4B, the mandrel 20 is raised in a state where a constant load P is applied to the mold 41, and the molding material W The medium diameter portion 20M that holds' from the inner diameter portion side is replaced with the small diameter portion 20S.
中径部20Mを小径部20Sに替えていくことにより、成形素材W’の内径部側に素材流動空間S3、S4を形成し、成形素材W’の未充満部T3と素材流動空間S3、S4への塑性流動を促す(図4(a)及び(b)中、成形素材W’内の矢印、参照)。   By changing the medium diameter portion 20M to the small diameter portion 20S, the material flow spaces S3 and S4 are formed on the inner diameter side of the molding material W ′, and the unfilled portion T3 and the material flow spaces S3 and S4 of the molding material W ′ are formed. The plastic flow is promoted (see arrows in the molding material W ′ in FIGS. 4A and 4B).
素材流動空間S3、S4も、同様に、マンドレル20の上昇に伴って上方に移動し、鍛造の進行に伴って、メインパンチは下方に移動する。これが、成形素材W’に対する2回目の鍛造である。そして、最終的に、図4(c)に示すように、上金型41と下金型42で形成する成形空間への充満度が高い成形品W”を得ることができる。   Similarly, the material flow spaces S3 and S4 move upward as the mandrel 20 rises, and the main punch moves downward as the forging progresses. This is the second forging of the molding material W ′. Finally, as shown in FIG. 4C, a molded product W ″ having a high degree of fullness in the molding space formed by the upper mold 41 and the lower mold 42 can be obtained.
ここで、図5に、メインパンチのストロークと成形荷重の関係を模式的に示す。図5に示すように、第一段階の成形(図3(a)、参照)が終了(図5中、A点、参照)するまで、成形荷重は増大する。そして、第一段階の成形(図3(a)、参照)の終了後も、そのまま、成形荷重を増大させると、成形空間への充満度は高まるが、金型が破損する。   Here, FIG. 5 schematically shows the relationship between the stroke of the main punch and the molding load. As shown in FIG. 5, the molding load increases until the first stage of molding (see FIG. 3A) is completed (see point A in FIG. 5). If the molding load is increased as it is even after the first stage molding (see FIG. 3A) is finished, the degree of fullness in the molding space increases, but the mold is damaged.
しかし、本発明方法においては、第一段階の成形が終了(図5中、A点)した後、図3に示す第二段階の成形(鍛造)、及び、図4に示す第三段階の成形(鍛造)において、金型を介して成形素材W’に負荷される荷重は一定である。   However, in the method of the present invention, after the first stage molding is completed (point A in FIG. 5), the second stage molding (forging) shown in FIG. 3 and the third stage molding shown in FIG. In (forging), the load applied to the forming material W ′ through the mold is constant.
即ち、マンドレルの大径部で環状素材Wを内径部側から保持して成形した後、環状素材Wを保持する大径部を、順次、中径部、小径部に替えることにより、一定の荷重のもとで、素材の未充満部と塑性流動空間に向かう塑性流動(素材の分流)を2回進行させ、素材の型充満度を高めて、形状精度のよい成形品を得ることができる。この点が、本発明の特徴である。   That is, after forming the annular material W from the inner diameter side with the large-diameter portion of the mandrel, the large-diameter portion holding the annular material W is sequentially changed to the medium-diameter portion and the small-diameter portion, thereby maintaining a constant load. Therefore, the plastic flow (material diversion) toward the unfilled portion of the raw material and the plastic flow space is advanced twice, and the mold filling degree of the raw material is increased to obtain a molded product with good shape accuracy. This is a feature of the present invention.
第二段階の成形(鍛造)と第三段階の成形(鍛造)において、成形素材の塑性流動を2回促す際、本発明金型のマンドレルにおける第一段差21での直径変化量“d1−d2”、及び、第二段差22での直径変化量“d2−d3”は、冷間鍛造加工における型充満性の向上、及び、成形品の内径部に発生する折込みの抑制の点で重要である(図1、参照)。   In the second stage molding (forging) and the third stage molding (forging), when the plastic flow of the molding material is urged twice, the diameter change amount “d1−d2” at the first step 21 in the mandrel of the mold of the present invention. "And the amount of change in diameter" d2-d3 "at the second step 22 are important in terms of improving die filling in cold forging and suppressing folding occurring in the inner diameter portion of the molded product. (See FIG. 1).
ここで、図6に、成形品の一態様を示す。図6に示す成形品の内径部には、折込み(疵)W1が形成され、端部には、バリW2が形成されている。   Here, FIG. 6 shows an embodiment of a molded product. A fold W1 is formed at the inner diameter portion of the molded product shown in FIG. 6, and a burr W2 is formed at the end.
本発明金型が中央部で内包する上下動可能なマンドレルの大径部の直径d1、中径部の直径d2、及び、小径部の直径d3は、それぞれ、環状素材又は成型品の形状、寸法に応じて適宜設定する。   The diameter d1 of the large diameter part, the diameter d2 of the medium diameter part, and the diameter d3 of the small diameter part of the mandrel capable of moving up and down included in the center of the mold of the present invention are the shape and dimensions of the annular material or the molded product, respectively. Set appropriately according to
しかし、直径変化量“d1−d2”及び/又は“d2−d3”が小さいと、塑性流動を促すのに十分な体積を有する空間を、素材の内径部側に確保することができず、鍛造加工における型充満性を向上させる効果が小さくなる場合がある。一方、上記直径変化量が一定値を超えると、図6に示す折込み(疵)W1が大きくなり、また、“d2−d3”が一定値を超えると、バリW2が厚くかつ長くなることがある。このことを踏まえ、マンドレルにおける直径変化量“d1−d2”及び“d2−d3”を設定する。   However, if the diameter change amount “d1−d2” and / or “d2−d3” is small, a space having a sufficient volume to promote plastic flow cannot be secured on the inner diameter side of the material, and forging In some cases, the effect of improving the mold filling property in processing is reduced. On the other hand, when the amount of diameter change exceeds a certain value, the fold W1 shown in FIG. 6 increases, and when “d2−d3” exceeds a certain value, the burr W2 may become thick and long. . Based on this, the diameter change amounts “d1-d2” and “d2-d3” in the mandrels are set.
本発明者らは、素材が鋼素材の場合において、直径変化量“d1−d2”及び“d2−d3”を変化させて、成形品の内径部に生じる折込み(疵)、及び、バリの発生状況を調査した。その結果、直径変化量“d1−d2”及び“d2−d3”は、下記式(1)及び(2)式を満たすことが、折込み(疵)や、バリの発生を抑制しつつ成型品の型充満性を高めるために有効であることが解った。   In the case where the material is a steel material, the inventors have changed the amount of change in diameter “d1−d2” and “d2−d3” to generate folds and burrs that occur in the inner diameter portion of the molded product. The situation was investigated. As a result, the diameter change amounts “d 1 -d 2” and “d 2 -d 3” satisfy the following formulas (1) and (2) to prevent the formation of folds and burrs while suppressing the occurrence of burrs. It has been found that it is effective for enhancing the mold filling property.
0.01×d1≦d1−d2≦0.1×d1 ・・・(1)
0.01×d1≦d2−d3≦0.1×d1 ・・・(2)
0.01 × d1 ≦ d1−d2 ≦ 0.1 × d1 (1)
0.01 × d1 ≦ d2−d3 ≦ 0.1 × d1 (2)
“d1−d2”及び/又は“d2−d3”が“0.01×d1”未満であると、前述したように、成形途中で、塑性流動を促すのに十分な体積を有する空間(素材流動空間)を、素材の内径部側に形成することができず、冷間鍛造加工における型充満性を向上させる効果が小さくなる場合がある。   When “d1−d2” and / or “d2−d3” is less than “0.01 × d1”, as described above, a space having a sufficient volume to promote plastic flow during molding (material flow) Space) cannot be formed on the inner diameter side of the material, and the effect of improving die filling in cold forging may be reduced.
一方、“d1−d2”及び/又は“d2−d3”が“0.1×d1”を超えると、前述したように、成形品の内径部における折込み(疵)が大きくなる。“d2−d3”が“0.1×d1”を超えると、バリが厚くかつ長くなることがある(図6、参照)。   On the other hand, when “d 1 -d 2” and / or “d 2 -d 3” exceeds “0.1 × d 1”, as described above, the folding (crease) at the inner diameter portion of the molded product increases. When “d2−d3” exceeds “0.1 × d1”, the burr may be thick and long (see FIG. 6).
マンドレルの段差の面は、マンドレルの軸心に対し、垂直でもよいし、傾斜していてもよい。本発明金型においては、マンドレルの外周に、上記式(1)及び(2)を満たす段差が存在することが、成型品の形状精度を高めるために重要なことである。   The step surface of the mandrel may be perpendicular or inclined with respect to the axis of the mandrel. In the mold of the present invention, it is important for the shape accuracy of the molded product to be increased that the step satisfying the above formulas (1) and (2) exists on the outer periphery of the mandrel.
次に、本発明の実施例について説明する。実施例において、鋼素材を用い、成形品を歯車としたのは、以下の理由による。歯車の成形においては、金型の歯底部で応力集中が起こり、金型が破損し易い。   Next, examples of the present invention will be described. In the examples, the steel material was used and the molded product was a gear for the following reason. In the formation of gears, stress concentration occurs at the bottom of the mold, and the mold is easily damaged.
さらに、鋼は、変形抵抗が高く、成形時の金型への負荷が高い材料なので、鋼素材で成形できれば、特殊な材質の素材を除き、金型の焼付きや凝着、素材割れ等の問題を考慮しなければ、殆どの他の金属素材においても成形が可能である。したがって、鋼素材を用いる歯車の成形は、本発明の実施可能性と効果の顕著性を示すうえで最適である。   In addition, steel is a material that has high deformation resistance and a high load on the mold during molding, so if it can be molded with steel material, it will not cause seizure or adhesion of the mold, material cracking, etc., except for special materials. If the problem is not taken into account, it is possible to form almost any other metal material. Therefore, the formation of a gear using a steel material is optimal in order to show the feasibility and saliency of the present invention.
そして、実施例での条件は、本発明の実施可能性及び効果を確認するために採用した一条件例であり、本発明は、この一条件例に限定されるものではない。本発明は、本発明の要旨を逸脱せず、本発明の目的を達成する限りにおいて、種々の条件を採用し得るものである。   And the conditions in an Example are one condition examples employ | adopted in order to confirm the feasibility and effect of this invention, and this invention is not limited to this one condition example. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
(実施例1)
素材として、SCr420−H(質量%で、C:0.19%、Si:0.24%、Mn:0.73%、P:0.014%、S:0.019%、Cr:1.09%)圧延材(60mmφ)を球状化焼鈍(740℃、3時間保持から徐冷)した後、外径41mmφ、内径30mmφの円環状に加工したテストピース素材を用いた。
Example 1
As materials, SCr420-H (in mass%, C: 0.19%, Si: 0.24%, Mn: 0.73%, P: 0.014%, S: 0.019%, Cr: 1. 09%) After rolling the rolled material (60 mmφ) into a spheroidizing anneal (from 740 ° C. for 3 hours, gradually cooling), a test piece material processed into an annular shape with an outer diameter of 41 mmφ and an inner diameter of 30 mmφ was used.
上記素材に、潤滑剤として、リン酸塩石けん皮膜処理を行った後、塑性加工油を塗布し、従来装置と本発明装置を用い、保持荷重1440kNで歯車に成形し、歯先充満率を測定した。   After the phosphate soap film treatment is applied to the above material as a lubricant, plastic working oil is applied, and the gear is formed into a gear with a holding load of 1440 kN using the conventional device and the present invention device, and the tooth tip filling rate is measured. did.
図7に、実施例で用いたマンドレルの態様を示す。図7(a)に、従来装置が備えるマンドレルの態様を示し、図7(b)に、本発明装置が備えるマンドレルの態様を示す。マンドレルの直径変化量の総和dは、いずれも、2.0mmである。   FIG. 7 shows the mode of the mandrel used in the example. FIG. 7A shows an aspect of the mandrel included in the conventional apparatus, and FIG. 7B shows an aspect of the mandrel included in the apparatus of the present invention. The total d of the mandrel diameter changes is 2.0 mm.
図8に、歯車の歯先充満率の定義を示す。図8に示すように、歯幅bと、歯先部分において素材が金型と接触した長さbcの比bc/bを百分率で表したものが歯先充満率である。歯先充満率は、型充満性を定量的に評価する指標である。歯先充満率は、従来装置では86%であったが、本発明装置では95%であった。 FIG. 8 shows the definition of the gear tip filling rate. As shown in FIG. 8, the tooth tip filling rate is expressed as a percentage of the ratio b c / b of the tooth width b and the length b c at which the material contacts the mold in the tooth tip portion. The tooth tip filling rate is an index for quantitatively evaluating the mold filling property. The tooth tip filling rate was 86% in the conventional device, but 95% in the device of the present invention.
(実施例2)
マンドレルの直径変化量の総和dを0.2mm、0.5mm、及び、1.0mmとして、従来装置用のマンドレルと本発明装置用のマンドレルを作製し、実施例1と同様に歯車を成形し、歯先充満率を測定した。
(Example 2)
The mandrel for the conventional device and the mandrel for the device of the present invention were prepared by setting the sum d of the diameter change amount of the mandrel to 0.2 mm, 0.5 mm, and 1.0 mm, and the gear was formed in the same manner as in Example 1. The tooth tip filling rate was measured.
図9に、マンドレルの直径変化量の総和d[mm]と歯先の充満率bc/b[%]の関係を、実施例1の結果と併せて示す。図9から、本発明装置においては、歯先の充満率が顕著に向上していることが解る。 FIG. 9 shows the relationship between the total amount d [mm] of the diameter change amount of the mandrel and the fullness rate b c / b [%] of the tooth tip together with the result of Example 1. From FIG. 9, it can be seen that in the device of the present invention, the filling rate of the tooth tip is remarkably improved.
(実施例3)
素材として、SCr420−H(質量%で、C:0.19%、Si:0.24%、Mn:0.73%、P:0.014%、S:0.019%、Cr:1.09%)圧延材(直径60mmφ)を球状化焼鈍(740℃3時間保持から徐冷)した後、外径41mmφ、内径30mmφの円環状に加工したテストピース素材を用い、潤滑剤として、リン酸塩石けん皮膜処理を行った後、塑性加工油を塗布した。
(Example 3)
As materials, SCr420-H (in mass%, C: 0.19%, Si: 0.24%, Mn: 0.73%, P: 0.014%, S: 0.019%, Cr: 1. 09%) After rolling the rolled material (diameter 60 mmφ) into a spheroidized anneal (slow cooling from holding at 740 ° C. for 3 hours), a test piece material processed into an annular shape with an outer diameter of 41 mmφ and an inner diameter of 30 mmφ was used, and phosphoric acid as a lubricant After the salt soap film treatment, plastic working oil was applied.
保持荷重1140kNにて、表2に示すマンドレルの直径変化量の条件で、上記素材を室温で成形し、表1に示す諸元の歯車を製造し、金型の成形部への充満率(歯先充満率)を測定し、内部径における折込み(疵)の有無を目視で観察した。結果を、表2に併せて示す。   With the holding load of 1140kN, the above materials are molded at room temperature under the conditions of the mandrel diameter variation shown in Table 2, and the gears shown in Table 1 are manufactured. The pre-filling rate) was measured, and the presence or absence of folds (creases) in the internal diameter was visually observed. The results are also shown in Table 2.
比較例1〜4は、従来形状のマンドレル(段差が一つ)を用いた例である。発明例1〜10は、本発明金型(マンドレルに段差が二つ)を用いた例である。発明例7及び9は、上記式(1)を満たさない例であり、発明例8及び10は、上記式(2)を満たさない例であるが、発明例7〜10の製造方法は、依然として本発明(請求項1の発明)の範囲である。   Comparative Examples 1 to 4 are examples using a conventional mandrel (one step). Invention Examples 1 to 10 are examples using the mold of the present invention (mandrel has two steps). Invention Examples 7 and 9 are examples that do not satisfy the above formula (1), and Invention Examples 8 and 10 are examples that do not satisfy the above formula (2), but the production methods of Invention Examples 7 to 10 are still This is within the scope of the present invention (the invention of claim 1).
ここで、表2における直径変化量の総和の欄は、鍛造過程におけるマンドレル直径変化量の総和を表す。比較例1〜4において用いたマンドレルは、従来型の一段段差であるから“d1−d2”に等しく、発明例において用いたマンドレルは、二段段差であるから“d1−d3”に等しい。   Here, the column of the total diameter change amount in Table 2 represents the total mandrel diameter change amount in the forging process. The mandrels used in Comparative Examples 1 to 4 are equal to “d1−d2” because they are conventional one-stage steps, and the mandrels used in the inventive examples are equal to “d1−d3” because they are two-step steps.
表2に実施例をまとめたが、折込み(疵)の評価は、目視により全く確認できないものを○、目視確認できるものの、浅くて、小さくて見え難く、実用上問題のないものを△、深くて、大きく、はっきりと折込み(疵)と確認でき、実用に供せないものを×とした。   Examples are summarized in Table 2, and the evaluation of the folds (疵) is ◯ for those that cannot be confirmed by visual observation, but can be visually confirmed, but those that are shallow, small, difficult to see, and have no practical problems are △, deep. In this case, it was marked as x if it was large and clearly confirmed as a fold (butterfly) and could not be put to practical use.
歯先充満率に影響を及ぼす因子としては、素材の変形抵抗、素材−金型間の摩擦係数、成形荷重、及び、マンドレルの直径変化量の総和がある。この直径変化量の総和は、マンドレルの最大直径と最小直径の差に等しい。即ち、従来技術のように、一段式のマンドレルの場合、マンドレルの直径変化量の総和は、(d1−d2)であり、本発明金型のように二段式のマンドレルの場合は、(d2−d3)である。   Factors affecting the tooth tip filling rate include the deformation resistance of the material, the coefficient of friction between the material and the mold, the molding load, and the total amount of change in the diameter of the mandrel. The sum of the diameter changes is equal to the difference between the maximum diameter and the minimum diameter of the mandrel. That is, in the case of a one-stage mandrel as in the prior art, the sum of the diameter changes of the mandrels is (d1-d2), and in the case of a two-stage mandrel as in the mold of the present invention, (d2 -D3).
以下の比較例及び発明例では、主に、マンドレルの直径と段差数を変え、主に、直径変化量の総和を変えている。   In the following comparative examples and invention examples, the diameter of the mandrel and the number of steps are mainly changed, and the total sum of the diameter changes is mainly changed.
比較例1〜4では、成形の第二段階で、荷重及びd1一定のもとでd2を変化させた。マンドレルの直径変化量(d1−d2)の増加に伴い、歯先充満率が向上したが、比較例3、4では、内径部に折込み(疵)が発生した。比較例1、2では、内径部に折込み(疵)は発生しなかったが、直径変化量の大きい比較例2においても、歯先充満率は55%と低い。   In Comparative Examples 1 to 4, d2 was changed under the constant load and d1 in the second stage of molding. As the mandrel diameter change amount (d1-d2) increased, the tooth tip filling rate improved, but in Comparative Examples 3 and 4, folding (wrinkles) occurred in the inner diameter portion. In Comparative Examples 1 and 2, no folds (creases) occurred in the inner diameter portion, but in Comparative Example 2 where the amount of change in diameter is large, the tooth tip filling rate is as low as 55%.
発明例1〜4では、成形の第二、第三段階の荷重及びd1を一定にして、d2及びd3を変化させた。なお、d2及びd3は、任意に設定できるが、発明例1〜4については、d1−d2=d2−d3とした。マンドレルの直径変化量((d1−d2)、(d2−d3))の増加に伴い、歯先充満率が向上している。   In Invention Examples 1 to 4, d2 and d3 were changed with the load and d1 in the second and third stages of molding being constant. Note that d2 and d3 can be set arbitrarily, but in Examples 1 to 4, d1−d2 = d2−d3. As the mandrel diameter change ((d1-d2), (d2-d3)) increases, the tooth tip filling rate is improved.
歯先充満率に影響を及ぼす因子である、素材の変形抵抗、素材−金型間の摩擦係数、成形荷重、直径変化量を同一条件とした、比較例1と発明例1、比較例2と発明例2、比較例3と発明例3、比較例4と発明例4を、それぞれ、比較する。   Comparative Example 1, Inventive Example 1, and Comparative Example 2 with the same conditions of deformation resistance of the material, coefficient of friction between the material and the mold, molding load, and diameter variation, which are factors affecting the tooth filling rate Invention Example 2, Comparative Example 3 and Invention Example 3, and Comparative Example 4 and Invention Example 4 are respectively compared.
マンドレルの直径変化量の総和が同じである場合、段差が一つである比較例に比べると、段差を二つ有するマンドレルを用いた発明例においては、いずれも歯先充満率が向上し、内径部の折込み(疵)の発生も抑制されていることが解る。   When the total amount of diameter change of the mandrel is the same, compared to the comparative example having one step, in the invention example using the mandrel having two steps, both the tooth tip filling rate is improved and the inner diameter It can be seen that the occurrence of folds (folds) in the part is also suppressed.
発明例7は、(d1−d2)/d1が上記式(1)の下限を下回る。発明例8は、(d2−d3)/d1が上記式(2)の下限を下回る。発明例7及び8は、マンドレルの直径変化量の総和が比較例1及び発明例1と同じである。これらの発明例は、比較例1より歯先充満率が高いが、上記式(1)又は上記式(2)の下限を下回っているため、発明例1よりは歯先充満率が低い。しかし、実用に供するには問題ない。   In Invention Example 7, (d1-d2) / d1 is less than the lower limit of the above formula (1). In invention example 8, (d2-d3) / d1 is less than the lower limit of the above formula (2). Inventive Examples 7 and 8 are the same as Comparative Example 1 and Inventive Example 1 in terms of the sum of the diameter changes of the mandrels. Although these invention examples have a tooth tip filling rate higher than that of Comparative Example 1, they are lower than the lower limit of the above formula (1) or the above formula (2), so that the tooth tip filling rate is lower than that of the invention example 1. However, there is no problem for practical use.
発明例9は、(d1−d2)/d1が上記式(1)の上限を上回る。発明例10は、(d2−d3)/d1が上記式(2)の上限を上回る。発明例9及び10は、マンドレルの直径変化量の総和が比較例4及び発明例4と同じである。   In invention example 9, (d1-d2) / d1 exceeds the upper limit of the above formula (1). In invention example 10, (d2-d3) / d1 exceeds the upper limit of the above formula (2). Inventive Examples 9 and 10 are the same as Comparative Example 4 and Inventive Example 4 in the total amount of mandrel diameter change.
これらの発明例は、比較例4より歯先充満率が高く、発明例4と同等の歯先充満率であるが、上記式(1)又は(2)の上限を上回っている。したがって、内径部に、かすかな折込み(疵)が確認されたが、浅く小さいため、実用に供するのに問題はなく、折込み評価は△である。   These invention examples have a tooth tip filling rate higher than that of Comparative Example 4, and the tooth tip filling rate is equal to that of Invention Example 4, but exceeds the upper limit of the above formula (1) or (2). Therefore, although a slight fold (crease) was confirmed in the inner diameter portion, since it was shallow and small, there was no problem for practical use, and the fold evaluation was Δ.
発明例1〜6は、上記式(1)及び(2)を満たすマンドレルを用いた例である。発明例1〜6では、歯先充満率が高く、折込み(疵)の発生が抑制されていて、良好な歯車を製造することができた。   Invention Examples 1 to 6 are examples using mandrels satisfying the above formulas (1) and (2). In Invention Examples 1 to 6, the tooth tip filling rate was high, the occurrence of folding (creases) was suppressed, and a good gear could be manufactured.
発明例3、5、及び、6では、成形の第二、第三段階の荷重及びd1、マンドレルの直径変化量の総和を一定にして、直径変化量(d1−d2)と直径変化量(d2−d3)の比を変化させた。直径変化量の比の大小にかかわらず、歯先充満率が大きく向上している。   In Invention Examples 3, 5, and 6, the load of the second and third stages of molding, d1, and the total amount of change in diameter of the mandrel are made constant, and the change in diameter (d1-d2) and change in diameter (d2) The ratio of -d3) was varied. Regardless of the ratio of the diameter change amount, the tooth tip filling rate is greatly improved.
即ち、段差を二つ有するマンドレルを用いることにより、型充満度を著しく高め、さらに、欠陥の発生を抑制できることが解る。以上の実施例は、貫通孔を有する平歯車の成形の実施例であるが、本発明方法、本発明金型、及び、本発明装置は、実施例に限定されるものではない。   That is, it can be seen that by using a mandrel having two steps, the mold filling degree can be remarkably increased and the occurrence of defects can be suppressed. The above embodiment is an embodiment of forming a spur gear having a through hole. However, the method of the present invention, the mold of the present invention, and the device of the present invention are not limited to the embodiments.
図8に示す歯車は、上述のように、金型が破損し易い部品であるが、本発明は、成形部の形状によらず、著しく型充満度を向上させる効果を奏するものである。したがって、本発明は貫通孔を有する円柱や六角柱、図10に示す非軸対称部品、図11に示す非回転対称部品、はすば歯車等を鍛造加工で製造する場合にも適用することができるものである。   The gear shown in FIG. 8 is a component that easily breaks the mold as described above, but the present invention has an effect of remarkably improving the mold filling degree regardless of the shape of the molded portion. Therefore, the present invention can be applied to the case where a cylinder or hexagonal column having a through hole, the non-axisymmetric part shown in FIG. 10, the non-rotationally symmetric part shown in FIG. It can be done.
即ち、本発明方法、本発明金型、及び、本発明装置は、金型内の素材に、塑性流動を2回生じさせるので、所望の型充満度を得ることが難しい部品形状を鍛造加工で製造する場合でも、従来技術に比べて、顕著に型充満度を高めることができる。   That is, the method of the present invention, the mold of the present invention, and the apparatus of the present invention cause plastic flow twice in the material in the mold, so that it is possible to forge a part shape in which it is difficult to obtain a desired mold filling degree. Even in the case of manufacturing, the mold filling degree can be remarkably increased as compared with the prior art.
前述したように、本発明によれば、素材、特に、鋼素材の冷間鍛造において、パンチとマンドレルの協働で、成形途中の素材に塑性流動を2度生じさせるので、成形荷重を増大することなく、型充満度を顕著に高め、寸法精度の優れた鍛造成形品を得ることができる。よって、本発明は、鋼材加工産業において利用可能性が高いものである。   As described above, according to the present invention, in cold forging of a material, in particular, a steel material, the plastic flow is generated twice in the material in the middle of forming by the cooperation of the punch and the mandrel, thereby increasing the forming load. Therefore, it is possible to remarkably increase the degree of mold filling and obtain a forged product having excellent dimensional accuracy. Therefore, the present invention has high applicability in the steel material processing industry.
10 メインパンチ
20 マンドレル
20L 大径部
20M 中径部
20S 小径部
21 第一段差
22 第二段差
30 フローティングダイ
31 成形部
32 コンテナ部
33 閉塞油圧ユニット
40 カウンターパンチ
41 上金型
42 下金型
43 成形空間
L 距離
P 荷重
S1、S2、S3、S4 空間
T1、T2、T3 未充満部
W 環状素材
W’ 成形素材
W” 成形品
W1 折込み
W2 バリ
h 成形部の高さ
d1 大径部の径
d2 中径部の径
d3 小径部の径
b 歯幅
c 歯先部分において素材が金型と接触した長さ
DESCRIPTION OF SYMBOLS 10 Main punch 20 Mandrel 20L Large diameter part 20M Medium diameter part 20S Small diameter part 21 1st level | step difference 22 2nd level | step difference 30 Floating die 31 Molding part 32 Container part 33 Blocking hydraulic unit 40 Counter punch 41 Upper mold 42 Lower mold 43 Molding Space L Distance P Load S1, S2, S3, S4 Space T1, T2, T3 Unfilled part W Annular material W 'Molding material W "Molded product W1 Fold W2 Burr h Molded part height d1 Large diameter part diameter d2 Medium Diameter of the diameter part d3 Diameter of the small diameter part b Teeth width b c Length at which the material contacts the mold at the tooth tip part

Claims (8)

  1. 貫通孔を有する素材を、貫通孔に嵌装したマンドレルと、該素材を加圧するパンチの協働で、金型の成形空間に押し込み、上記素材の外周部を部品形状に成形する成形品の製造方法において、
    (x)二つの段差で、大径部、中径部、及び、小径部を、この順序で形成したマンドレルを用い、
    (y)上記マンドレルの大径部を素材の貫通孔に嵌装し、該素材を、パンチで加圧して、金型の成形空間に押し込み、
    (z)上記加圧荷重が所定の荷重に達し、金型の成形空間内の素材が所定の荷重で加圧されている状態で、
    (z1)マンドレルを移動させて、素材を保持する大径部を中径部に替え、金型の成形空間内の素材の内径部側に素材流動空間を形成して、素材の塑性流動を促し、次いで、
    (z2)上記素材の塑性流動により、素材が素材流動空間の一部又は全部を占有したとき、さらに、再度、マンドレルを移動させて、素材を保持する中径部を小径部に替え、上記素材流動空間を拡大又は再形成して、さらに、素材の塑性流動を促す
    ことを特徴とする成形品の製造方法。
    Manufacture of a molded product in which a material having a through hole is pushed into a molding space of a mold by the cooperation of a mandrel fitted in the through hole and a punch for pressurizing the material, and the outer periphery of the material is molded into a part shape. In the method
    (X) Using a mandrel formed with two steps, a large diameter portion, a medium diameter portion, and a small diameter portion in this order,
    (Y) The large-diameter portion of the mandrel is fitted into the through-hole of the material, the material is pressed with a punch and pushed into the molding space of the mold,
    (Z) In a state where the pressurization load reaches a predetermined load and the material in the molding space of the mold is pressed with the predetermined load,
    (Z1) Move the mandrel to change the large diameter part holding the material to the medium diameter part and form the material flow space on the inner diameter part side of the material in the molding space of the mold to promote the plastic flow of the material Then
    (Z2) When the material occupies part or all of the material flow space due to the plastic flow of the material, the mandrel is moved again to change the medium diameter part holding the material to the small diameter part, and the material A method for producing a molded article, characterized by enlarging or reshaping the fluid space and further promoting plastic flow of the material.
  2. 前記素材が鋼素材であることを特徴とする請求項1に記載の成形品の製造方法。   The method of manufacturing a molded product according to claim 1, wherein the material is a steel material.
  3. 前記部品形状が歯車形状であることを特徴とする請求項1又は2に記載の成形品の製造方法。   The method of manufacturing a molded product according to claim 1, wherein the part shape is a gear shape.
  4. 貫通孔を有する素材を、貫通孔に嵌装したマンドレルと協働して、該素材を成形空間に押し込んで、上記素材の外周部を部品形状に成形する成形品製造用金型であって、該金型の中心部にて、
    (x)二つの段差で、大径部、中径部、及び、小径部が、この順序で先端に向かい形成されているマンドレルを上下動可能に内包する
    ことを特徴とする成形品製造用金型。
    A mold for manufacturing a molded product, in which a material having a through hole is pressed into a molding space in cooperation with a mandrel fitted in the through hole, and the outer periphery of the material is molded into a part shape, At the center of the mold,
    (X) Molded article manufacturing gold characterized by including a mandrel formed with two steps so that the large diameter part, the medium diameter part, and the small diameter part are formed toward the tip in this order so as to be movable up and down. Type.
  5. 貫通孔を有する素材を、貫通孔に嵌装したマンドレルと協働して、該素材を成形空間に押し込んで、上記素材の外周部を部品形状に成形する成形品製造用金型であって、該金型の中心部にて、
    (x1)二つの段差で、大径部、中径部、及び、小径部が、この順序で先端に向かい形成されていて、かつ、(x2)上記大径部の直径d1、中径部の直径d2、及び、小径部の直径d3が、下記式(1)及び(2)を満たすマンドレルを上下動可能に内包する
    ことを特徴とする型充満性に優れた成形品製造用金型。
    0.01×d1≦d1−d2≦0.1×d1 ・・・(1)
    0.01×d1≦d2−d3≦0.1×d1 ・・・(2)
    A mold for manufacturing a molded product, in which a material having a through hole is pressed into a molding space in cooperation with a mandrel fitted in the through hole, and the outer periphery of the material is molded into a part shape, At the center of the mold,
    (X1) The two steps are formed such that the large diameter portion, the medium diameter portion, and the small diameter portion are formed toward the tip in this order, and (x2) the diameter d1 of the large diameter portion, A mold for producing a molded article excellent in mold filling characteristics, characterized in that a mandrel satisfying the following formulas (1) and (2) is included so that the diameter d2 and the diameter d3 of the small diameter portion can be moved up and down.
    0.01 × d1 ≦ d1−d2 ≦ 0.1 × d1 (1)
    0.01 × d1 ≦ d2−d3 ≦ 0.1 × d1 (2)
  6. 前記部品形状が歯車形状であることを特徴とする請求項4又は5に記載の成形品製造用金型。   The mold for manufacturing a molded product according to claim 4 or 5, wherein the part shape is a gear shape.
  7. 請求項4〜6のいずれか1項に記載の成形品製造用金型と、該金型に対向する位置に、貫通孔を有する素材を収容し、該素材の外周部を部品形状に成形する成形空間を有する成形品製造用金型を備えることを特徴とする成形品製造装置。   A mold for manufacturing a molded product according to any one of claims 4 to 6 and a material having a through hole are accommodated at a position facing the mold, and an outer peripheral portion of the material is molded into a part shape. A molded product manufacturing apparatus comprising a mold for manufacturing a molded product having a molding space.
  8. 前記部品形状が歯車形状であることを特徴とする請求項7に記載の成形品製造装置。   The molded part manufacturing apparatus according to claim 7, wherein the part shape is a gear shape.
JP2013014689A 2012-04-18 2013-01-29 Molded product manufacturing method, molded product mold and molded product manufacturing apparatus Active JP6102286B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2012094528 2012-04-18
JP2012094528 2012-04-18
JP2013014689A JP6102286B2 (en) 2012-04-18 2013-01-29 Molded product manufacturing method, molded product mold and molded product manufacturing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013014689A JP6102286B2 (en) 2012-04-18 2013-01-29 Molded product manufacturing method, molded product mold and molded product manufacturing apparatus

Publications (2)

Publication Number Publication Date
JP2013237099A true JP2013237099A (en) 2013-11-28
JP6102286B2 JP6102286B2 (en) 2017-03-29

Family

ID=49762614

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013014689A Active JP6102286B2 (en) 2012-04-18 2013-01-29 Molded product manufacturing method, molded product mold and molded product manufacturing apparatus

Country Status (1)

Country Link
JP (1) JP6102286B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017195957A1 (en) * 2016-05-09 2017-11-16 (주)성진포머 Mold pin for manufacturing tube yoke

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05212470A (en) * 1992-02-06 1993-08-24 Mitsuboshi Seisakusho:Kk Input shaft and manufacture thereof
JPH05309434A (en) * 1992-03-12 1993-11-22 Aida Eng Ltd Method for plastic working of member with hole
JPH07214220A (en) * 1994-01-25 1995-08-15 Aida Eng Ltd Plastic working method
JPH07284875A (en) * 1994-04-14 1995-10-31 Aida Eng Ltd Plastic working method
JPH09141354A (en) * 1995-11-20 1997-06-03 Aisin Seiki Co Ltd Production of high tooth height spline of hollow shaft and hollow shaft having high tooth height spline
JP2001300681A (en) * 2000-04-17 2001-10-30 Nissan Motor Co Ltd Manufacturing method of transmission gear

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05212470A (en) * 1992-02-06 1993-08-24 Mitsuboshi Seisakusho:Kk Input shaft and manufacture thereof
JPH05309434A (en) * 1992-03-12 1993-11-22 Aida Eng Ltd Method for plastic working of member with hole
JPH07214220A (en) * 1994-01-25 1995-08-15 Aida Eng Ltd Plastic working method
JPH07284875A (en) * 1994-04-14 1995-10-31 Aida Eng Ltd Plastic working method
JPH09141354A (en) * 1995-11-20 1997-06-03 Aisin Seiki Co Ltd Production of high tooth height spline of hollow shaft and hollow shaft having high tooth height spline
JP2001300681A (en) * 2000-04-17 2001-10-30 Nissan Motor Co Ltd Manufacturing method of transmission gear

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017195957A1 (en) * 2016-05-09 2017-11-16 (주)성진포머 Mold pin for manufacturing tube yoke

Also Published As

Publication number Publication date
JP6102286B2 (en) 2017-03-29

Similar Documents

Publication Publication Date Title
Merklein et al. Bulk forming of sheet metal
Shinkin et al. E ngineering calculations for processes involved in the production of large-diameter pipes by the sms meer technology
JP4907846B2 (en) Gear, gear manufacturing method and apparatus
JP4798674B1 (en) Rack bar and manufacturing method thereof
WO2006040840A1 (en) Method for manufacturing toothed parts
CN102489978A (en) Hot and cold composite precision forging forming method of great-modulus high-thickness straight-tooth cylindrical gear
TW201041673A (en) Gear forming method
JP6102286B2 (en) Molded product manufacturing method, molded product mold and molded product manufacturing apparatus
Wang et al. A forming technology of spur gear by warm extrusion and the defects control
Li et al. Numerical analysis and experimental validation of conjunction gear via hot forging-upsetting finishing-radial extrusion
JP5246588B2 (en) Gear manufacturing apparatus and method
JP3906998B2 (en) Manufacturing method of tooth profile parts
JP2015136736A (en) Manufacturing method of two-stage gear by forging and two-stage cold extrusion processing
JP4383151B2 (en) Manufacturing method of helical gear
CN103302459A (en) Machining method of automobile clutch damping shaft sleeve
JP4145924B2 (en) Tooth profile forming method
JP4653141B2 (en) Tooth formation method
JP2006043770A (en) Method for producing formed product, die for forging formed product, formed product and forging production system
JP3674437B2 (en) Boss gear forming method
JP2014066336A (en) Gear with flange
Kiener et al. Researching of commonalities and differences in cold forging of spur and helical gears
RU2451573C2 (en) Method of producing hollow forgings
JP2016097430A (en) Helical gear and helical gear manufacturing method
JP2019141883A (en) Forging method
RU2502574C2 (en) Method of forging bellows form tube billets

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150903

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20160622

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160628

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160818

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20170131

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20170213

R151 Written notification of patent or utility model registration

Ref document number: 6102286

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350