JPS61266141A - Forward extrusion forging method - Google Patents

Forward extrusion forging method

Info

Publication number
JPS61266141A
JPS61266141A JP10701485A JP10701485A JPS61266141A JP S61266141 A JPS61266141 A JP S61266141A JP 10701485 A JP10701485 A JP 10701485A JP 10701485 A JP10701485 A JP 10701485A JP S61266141 A JPS61266141 A JP S61266141A
Authority
JP
Japan
Prior art keywords
billet
outside diameter
cavity
angle
approximately equal
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.)
Pending
Application number
JP10701485A
Other languages
Japanese (ja)
Inventor
Toshio Maeda
真枝 俊雄
Takeshi Kodama
武 児玉
Kaoru Yamanoi
山之井 薫
Chiyoji Miura
三浦 千代志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP10701485A priority Critical patent/JPS61266141A/en
Publication of JPS61266141A publication Critical patent/JPS61266141A/en
Pending legal-status Critical Current

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  • Forging (AREA)

Abstract

PURPOSE:To position a billet to the center of an extrusion molding die and to prevent the generation of a longitudinal flash by subjecting the billet to hot forging without restraining the intermediate part to form the intermediate part to the same diameter as the outside diameter of extrusion molding and chamfering both ends to the diameter smaller than the outside diameter in a stage before the extrusion molding. CONSTITUTION:The billet 4 is heated and thereafter the top and bottom ends thereof are chamfered by upper and lower dies 7, 8 until the edges over the entire circumference are eliminated while the central part thereof is not restrained. The ends are chamfered to the angle approximately equal to the angle of the guide part 2 of a cavity 3 of a forward extrusion die; at the same time the outside diameter in the non-restrained part at the center is bulged to the size approximately equal to the outside diameter of the forming part 1 of the cavity 3. The billet 4 is thus smoothly inserted into the part 1 of the cavity 3. The extrusion angle thereof and the chamfering angle are approximately equal and the outside diameter in the central part is approximately equal to the outside diameter in the forming part 1. The billet 4 is thus positioned to the center of the part 1 and the uniform clearance is maintained. The generation of the longitudinal flash at the corner on the top end face after the molding is thereby obviated.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は金属ビレットの前方押出し鍛造方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for forward extrusion forging of metal billets.

(従来の技術) この種方法として例えば第3図aに示すように成形部(
1)と該成形部(1)に連続して傾斜する案内部(2)
とを有するキャビティ(3)内にビレツ1へ(4)を挿
入して同図すに示すようにパンチ(5)により押出し成
形して製品(6)を得るような場合にその@造を冷間か
又は熱間で行なっている。
(Prior art) As a method of this kind, for example, as shown in FIG.
1) and a guide part (2) that slopes continuously to the molded part (1).
When inserting (4) into the fillet 1 into a cavity (3) having a It is done in between or hot.

(発明が解決しようとする問題点) しかし冷間鍛造は、そのピレッ1〜の球状化燃焼鈍等の
前処理工程が煩雑であり、又その熱間鍛造はそのビレッ
トの前処理工程を不要とするが、ビレットは型と間隙を
存して挿入されるためビレットは型内で一方に傾き、且
つビレットの変形抵抗が低く流動性の良いことからパン
チとダイとのクリアランス部に縦パリを発生し、該バリ
は続く製品の据込工程等において、その上面に巻き込ま
れたり、或はこれがダイをかじってダイの摩耗が激しく
なる等の問題点を有していた。
(Problems to be Solved by the Invention) However, cold forging requires complicated pretreatment processes such as spheroidization and combustion dulling of the pillets 1 to 1, and hot forging does not require pretreatment processes for the billets. However, because the billet is inserted with a gap between the mold and the mold, the billet tilts to one side in the mold, and because the billet has low deformation resistance and good fluidity, vertical cracks occur in the clearance between the punch and die. However, the burr has problems such as being caught on the upper surface of the burr during the subsequent upsetting process of the product, or gnawing on the die, resulting in severe wear of the die.

(問題点を解決するための手段) 本発明は、か)る問題点を特に熱間鍛造における問題点
を解決することを目的としたもので、ビレットを成形部
と該成形部に連続して傾斜する案内部とを有するキャビ
ティ内に挿入してパンチにより押出し成形する前方押出
し鍛造方法において、該押出し成形の前工程として、該
ビレットに中間部非拘束の熱間鍛造で、その中間部を前
記成形部の外径と同径とし、且つその両端部を前記成形
部の外径より小径とした面付は加工を施すことを特徴と
する。
(Means for Solving the Problems) The present invention aims to solve the above problems, particularly in hot forging, and is aimed at solving the above problems, particularly in hot forging. In a forward extrusion forging method in which the billet is inserted into a cavity having an inclined guide portion and extruded with a punch, as a pre-process to the extrusion, the billet is hot forged with the intermediate portion not constrained, and the intermediate portion is formed as described above. It is characterized in that the facing is processed to have the same diameter as the outer diameter of the molded part, and both ends thereof have a smaller diameter than the outer diameter of the molded part.

(実施例) 以下上述した従来例と同様の第3図に示すキャビティ(
3)内で押圧形成する場合の本発明の一実施例について
第1図乃至第2図について説明するとビレット(4)は
約770〜880℃に加熱後直ちに第1図に示すように
中央部を非拘束にしてその上下端を上部ダイ(1)と下
部ダイ(8)とでその全周のエッチが無くなるまで面付
けをし、その面の角度は前方押出し型のキャビティ(3
)の傾斜する案内部(2)の角度と略同じくすると同時
にその中央の非拘束部の外径を前方押出し型キャビティ
(3)の成形部り1)の外径とはマ等しい寸法まで膨ら
ませる。この際ビレット(4)は中央部大半が型と接触
することはないので、面付は工程を入れたにも拘らずビ
レットの温度の低下は少ない。
(Example) Hereinafter, a cavity (
3) An embodiment of the present invention in which the billet (4) is press-formed in a chamber is explained with reference to FIGS. The upper and lower ends of the unrestrained surface are surfaced using the upper die (1) and the lower die (8) until there is no etching around the entire circumference, and the angle of the surface is set to the cavity (3) of the forward extrusion mold.
), and at the same time expand the outer diameter of the central unrestricted part to a dimension that is equal to the outer diameter of the molded part 1) of the forward extrusion mold cavity (3). . At this time, most of the center part of the billet (4) does not come into contact with the mold, so the temperature of the billet does not decrease much despite the imposition process.

次いでビレット(4)は第2図aに示すようにヒャピテ
ィ(3)内に挿入するときその端部の外径は成形部(1
)の外径より充分小さいので成形部(1)内への挿入は
スムーズに行なわれると共にその押出し角度と面付け角
度がは憧゛等しく且つその中央部の外径が形成部(1)
の外径と略等しいためビレット(4)は成形部〈1〉の
中心に位置決めされ倒れや片寄りがなく、全周に渡り成
形部<1)とビレツ1〜(4)のクリアランスは均一に
保たれるので、第2図示の如く成形完了後も上端面コー
ナーに縦パリがさすことはない。
Next, when the billet (4) is inserted into the capitivity (3) as shown in FIG.
) is sufficiently smaller than the outer diameter of the forming part (1), so that insertion into the forming part (1) is carried out smoothly, and the extrusion angle and imposition angle are ideally equal, and the outer diameter of the central part is smaller than that of the forming part (1).
Because the billet (4) is approximately equal to the outer diameter of the molded part <1>, it is positioned at the center of the molded part <1> without falling or shifting, and the clearance between the molded part <1) and the billets 1 to (4) is uniform over the entire circumference. Therefore, even after the molding is completed as shown in the second figure, there will be no vertical cracks at the corners of the upper end surface.

なお面付(ブ工程でビレット(4)に両端外径と中央部
外径とに寸法差を与えることににり押出しダイ内壁とビ
レット(4)の間には大ぎな非接触部分が形成されるた
め型への挿入から成形開始までの間のビレットの温度低
下を防ぎ成形完了後も成形部(1)の案内部(2)との
接続部に図示の如く型との非接触部分が残るので特に横
分割型ダイを使用する場合には上下ダイの寸法差を吸収
し分割面構パリの発生もな(型への負荷が少ないのと同
時に型とビレットとのフリクション等の押出し成形に要
する抵抗を少なくして縦パリ防止に貢献しまた成形開始
直前にはビレット下端面にはダイとはず等しい角度に面
が付けられていることからコーナーエッチが部分的に当
ることはなく面圧も低く潤滑切れによるダイのかじりや
摩耗が少ない。
In addition, by giving the billet (4) a dimensional difference between the outside diameter at both ends and the outside diameter at the center in the imposition process, a large non-contact area is formed between the inner wall of the extrusion die and the billet (4). In order to prevent the temperature of the billet from decreasing between insertion into the mold and the start of molding, a non-contact part with the mold remains at the connection part of the molding part (1) with the guide part (2) as shown in the figure even after molding is completed. Therefore, especially when using a horizontally split type die, it absorbs the dimensional difference between the upper and lower dies and eliminates the occurrence of cracks in the split surface structure. This reduces resistance and contributes to the prevention of vertical cracks.Also, just before the start of molding, the lower end of the billet has a surface at the same angle as the die, so the corner etch does not partially hit and the surface pressure is low. Less galling and wear of the die due to lack of lubrication.

(発明の効果) このように本発明によるときは、押出し成形の前工程と
して、ビレットに中間部非拘束の熱間鍛造でその中間部
をキャビティの成形部の外径と同径とし、旦つその両端
部を形成部の外径より小径とした面付は加工を施すもの
であるから、簡単な面付は加工によって製品の縦パリが
防止できる効果を有する。
(Effects of the Invention) As described above, according to the present invention, as a pre-process of extrusion molding, the billet is hot forged without constraining the middle part to make the middle part the same diameter as the outer diameter of the molded part of the cavity, and then Since the imposition in which both ends have a diameter smaller than the outer diameter of the forming part is performed, simple imposition has the effect of preventing vertical cracking of the product by machining.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は面付は加工を示す縦断面図、第2図は鍛造加工
を示す縦断面図でaはビレット挿入状態、bは加工後の
状態、第3図は従来の鍛造加工を示す縦断面図でaはビ
レット挿入状態すは加工後の状態を示す。 (1)・・・成形部     (2)・・・案内部(3
)・・・キャビティ   (4)・・・ビレット(5)
・・・パンチ
Fig. 1 is a longitudinal cross-sectional view showing the machining process, Fig. 2 is a longitudinal cross-sectional view showing the forging process, where a is the billet inserted state, b is the state after processing, and Fig. 3 is a longitudinal cross-sectional view showing the conventional forging process. In the top view, a shows the billet insertion state and the post-processing state. (1)...Molding part (2)...Guiding part (3
)...Cavity (4)...Billet (5)
···punch

Claims (1)

【特許請求の範囲】[Claims] ビレットを成形部と該成形部に連続して傾斜する案内部
とを有するキャビティ内に挿入してパンチにより押出し
成形する前方押出し鍛造方法において、該押出し成形の
前工程として、該ビレットに中間部非拘束の熱間鍛造で
、その中間部を前記成形部の外径と同径とし、且つその
両端部を前記成形部の外径より小径とした面付け加工を
施すことを特徴とする前方押出し鍛造方法。
In a forward extrusion forging method in which a billet is inserted into a cavity having a forming part and a guide part that is continuous with the forming part and extruded with a punch, the billet is Forward extrusion forging, characterized in that hot forging is carried out under restraint, and the middle part thereof is made to have the same diameter as the outer diameter of the forming part, and both ends thereof are subjected to surface processing with a diameter smaller than the outer diameter of the forming part. Method.
JP10701485A 1985-05-21 1985-05-21 Forward extrusion forging method Pending JPS61266141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10701485A JPS61266141A (en) 1985-05-21 1985-05-21 Forward extrusion forging method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10701485A JPS61266141A (en) 1985-05-21 1985-05-21 Forward extrusion forging method

Publications (1)

Publication Number Publication Date
JPS61266141A true JPS61266141A (en) 1986-11-25

Family

ID=14448315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10701485A Pending JPS61266141A (en) 1985-05-21 1985-05-21 Forward extrusion forging method

Country Status (1)

Country Link
JP (1) JPS61266141A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02307643A (en) * 1989-05-22 1990-12-20 Aida Eng Ltd Forward extrusion working method
JPH0377738A (en) * 1989-05-17 1991-04-03 Mitsuba Electric Mfg Co Ltd Method and apparatus for forward extrusion
US20110192210A1 (en) * 2004-09-08 2011-08-11 Nobuyoshi Yamashita Shaft member for fluid lubrication bearing apparatuses and a method for producing the same
CH705602A1 (en) * 2011-10-12 2013-04-15 Hatebur Umformmaschinen Ag Method for manufacturing mold, involves cutting a portion of metallic bar material and chamfering both ends of cut portion of metallic bar material before supplying cut portion to single-step transformation device
JP2014213364A (en) * 2013-04-26 2014-11-17 株式会社神戸製鋼所 Hot forging mold

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0377738A (en) * 1989-05-17 1991-04-03 Mitsuba Electric Mfg Co Ltd Method and apparatus for forward extrusion
JPH02307643A (en) * 1989-05-22 1990-12-20 Aida Eng Ltd Forward extrusion working method
US20110192210A1 (en) * 2004-09-08 2011-08-11 Nobuyoshi Yamashita Shaft member for fluid lubrication bearing apparatuses and a method for producing the same
US8387246B2 (en) * 2004-09-08 2013-03-05 Ntn Corporation Shaft member for fluid lubrication bearing apparatuses and a method for producing the same
CH705602A1 (en) * 2011-10-12 2013-04-15 Hatebur Umformmaschinen Ag Method for manufacturing mold, involves cutting a portion of metallic bar material and chamfering both ends of cut portion of metallic bar material before supplying cut portion to single-step transformation device
JP2014213364A (en) * 2013-04-26 2014-11-17 株式会社神戸製鋼所 Hot forging mold

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