JPH0673711B2 - Piston forging die - Google Patents

Piston forging die

Info

Publication number
JPH0673711B2
JPH0673711B2 JP61267012A JP26701286A JPH0673711B2 JP H0673711 B2 JPH0673711 B2 JP H0673711B2 JP 61267012 A JP61267012 A JP 61267012A JP 26701286 A JP26701286 A JP 26701286A JP H0673711 B2 JPH0673711 B2 JP H0673711B2
Authority
JP
Japan
Prior art keywords
piston
punch
cup
members
die
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.)
Expired - Fee Related
Application number
JP61267012A
Other languages
Japanese (ja)
Other versions
JPS63119943A (en
Inventor
久之 桜井
秀一 山根
信明 北條
孝一 渡辺
努 高井
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 JP61267012A priority Critical patent/JPH0673711B2/en
Publication of JPS63119943A publication Critical patent/JPS63119943A/en
Publication of JPH0673711B2 publication Critical patent/JPH0673711B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は内燃機関用ピストンの鍛造に用いられる金型に
関するものである。
TECHNICAL FIELD The present invention relates to a die used for forging a piston for an internal combustion engine.

(従来の技術) 内燃機関のピストンは第12図及び第13図に示す如くで、
ピストン(50)は頭部(51)、スカート部(52)、スカ
ート部外周の対向する部位に設けられた内方に突出する
ピストンピン取付用ボス部(53)、該ボス部に設けられ
たピン孔(54)を備え、ボス部(53)のピン孔(54)上
方部は軽量化のためにアンダーカットされて径方向への
凹部(55)を形成する。
(Prior Art) The piston of the internal combustion engine is as shown in FIG. 12 and FIG.
The piston (50) is provided on the head portion (51), the skirt portion (52), the inwardly projecting piston pin mounting boss portion (53) provided at opposing portions on the outer circumference of the skirt portion, and the boss portion. The pin hole (54) is provided, and the upper portion of the pin hole (54) of the boss portion (53) is undercut for weight reduction to form a radial recess (55).

以上のピストンを鍛造により製造する場合、円盤状のビ
レット(素材)を後方押し出し成形によりピストン素材
を成形し、その後機械加工仕上を行ってピストンを得
る。
When the above piston is manufactured by forging, a disk-shaped billet (material) is extruded rearward to form a piston material, and then mechanical finishing is performed to obtain the piston.

(発明が解決しようとする問題点) 以上の従来技術は、ピストンの鍛造成形を後方押し出し
により行うので、ピストン頭部のバルブ逃げ等の成形が
困難であること、製品形状に近い形状迄成形することが
困難である。又既述の如くピストン内径部内に、アンダ
ーカット凹部を軽量化等のために設けるが、従来の鍛造
成形ではこの部分の成形が実際上は不可能で、この結果
厚肉部となり、前記形状が粗であることと併せ機械加工
部分が多くなり、生産効率が悪く、又厚肉部、機械加工
部が多いので材料歩留りが悪い。
(Problems to be Solved by the Invention) In the above conventional technology, since the piston is forged by backward extrusion, it is difficult to mold the valve escape of the piston head, and the shape close to the product shape is formed. Is difficult. Further, as described above, the undercut recess is provided in the piston inner diameter portion for the purpose of reducing the weight, etc., but it is practically impossible to form this portion by conventional forging, and as a result, a thick portion is formed and In addition to being rough, the number of machined parts is large, the production efficiency is poor, and the material yield is poor because there are many thick parts and machined parts.

本発明は以上の問題点を解決すべくなされるもので、そ
の目的とする処は、鍛造によりピストンを最終形状に近
い形状まで成形でき、且つ内径部にアンダーカット凹部
の成形も同時に行い得、外径、寸法精度を向上させ、機
械加工を最小限に抑えて生産効率を向上させ、更には材
料歩留りを向上させてコスト上有利でもあるピストン鍛
造用金型を提供するにある。
The present invention is made to solve the above problems, the object of the purpose, the piston can be molded to a shape close to the final shape by forging, and can also be formed at the same time the undercut recess in the inner diameter, An object of the present invention is to provide a die for piston forging which is improved in outer diameter and dimensional accuracy, minimizes machining, improves production efficiency, and further improves material yield, which is also advantageous in cost.

(問題点を解決するための手段) 以上の問題点を解決するため本発明は、逆カップ状のピ
ストン素材(B)のカップ内に挿入されてカップ内面を
拘束する下パンチ(9)と、ピストン素材(B)の上面
(B1)を拘束・加圧する昇降動自在な上パンチ(5)
と、ピストン素材(B)の外周側面にピストンボス部用
の凹部(C3)を成形する進退動自在な一対のサイドパン
チ(8)を備えたピストン鍛造用金型において、下パン
チ(9)を中間の部材(12)と、この中間の部材(12)
に対して相対的に昇降動し且つ上端に突部(10a),(1
1a)を備えた一対の外側部材(10),(11)に分割構成
した。
(Means for Solving Problems) In order to solve the above problems, the present invention includes a lower punch (9) which is inserted into a cup of an inverted cup-shaped piston material (B) and restrains the inner surface of the cup. Upper punch (5) that can move up and down to restrain and press the upper surface (B 1 ) of the piston material (B)
And a piston forging die including a pair of side punches (8) that can be moved forward and backward to form a recess (C 3 ) for a piston boss on the outer peripheral side surface of the piston material (B). The intermediate member (12) and this intermediate member (12)
It moves up and down relatively to and has protrusions (10a), (1
It is divided into a pair of outer members (10) and (11) provided with 1a).

そして、これら外側部材(10),(11)を別個に昇降動
可能にするとともに、各外側部材(10),(11)を内側
に向けて偏寄可能にし、これら外側部材(10),(11)
を下降させて中間の部材(12)と一体化して成形品
(C)を成形することで前記突部(10a),(11a)によ
ってカップ内面にアンダーカット凹部(C6)を形成し、
次いで各外側部材(10),(11)を上昇させて一方側の
外側部材(10)の突部(10a)をアンダーカット凹部(C
6)から離脱させ、更に他方側の外側部材(11)のみを
上昇させて前記一方側の外側部材(10)を成形品(C)
のカップ内から抜き出すようにしたした。
Then, the outer members (10), (11) can be moved up and down separately, and the outer members (10), (11) can be biased toward the inner side, and these outer members (10), ( 11)
To form an undercut recess (C 6 ) on the inner surface of the cup by the protrusions (10a) and (11a) by lowering and lowering the intermediate member (12) to form a molded product (C).
Then, the outer members (10) and (11) are raised to move the protrusion (10a) of the outer member (10) on one side to the undercut recess (C
6 ), and only the outer member (11) on the other side is raised to form the outer member (10) on the one side into a molded product (C).
I tried to pull it out of the cup.

(上記手段による作用) 上記手段によれば、中間の部材(12)と外側部材(1
0),(11)を一体化した下パンチ(9)を、ピストン
素材(B)のカップ内に挿入して成形して、外側部材
(10),(11)の突部(10a),(11a)によって素材
(B)内壁にアンダーカット凹部(C6)を形成すると下
パンチ(9)に抜き出しが問題になる。
(Operation of the Means) According to the above means, the intermediate member (12) and the outer member (1)
The lower punch (9) in which 0) and (11) are integrated is inserted into the cup of the piston material (B) and molded to form the protrusions (10a) and (of the outer members (10) and (11). When the undercut recess (C 6 ) is formed on the inner wall of the material (B) by 11a), the extraction to the lower punch (9) becomes a problem.

このため、外側部材(10),(11)を別個に昇降可能に
し、各外側部材(10),(11)を内側に向けて偏寄可能
な状態にする。
Therefore, the outer members (10) and (11) can be raised and lowered separately, and the outer members (10) and (11) can be biased toward the inner side.

そして、各外側部材(10),(11)を上昇させて一方側
の外側部材(10)が内側に偏寄出来るようにして突部
(10a)をアンダーカット凹部(C6)から離脱させ、更
に他方側の外側部材(11)のみを上昇させて前記一方側
の外側部材(10)を成形品(C)のカップ内から抜き出
すことで円滑に抜き出せる。
Then, each outer member (10), (11) is raised so that the outer member (10) on one side can be biased inward, and the protrusion (10a) is disengaged from the undercut recess (C 6 ). Further, only the outer member (11) on the other side is raised and the outer member (10) on the one side is pulled out from the inside of the cup of the molded product (C), so that it can be smoothly pulled out.

従って、残った他方側の外側部材(11)も容易に抜き出
すことが出来る。
Therefore, the remaining outer member (11) on the other side can be easily extracted.

(実施例) 次に本発明の好適する一実施例を添付図面を参照しつつ
詳述する。
(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

第1図は本発明に係るピストン鍛造用金型の縦断正面図
で、これを説明すると、金型(1)は上ダイ(2)、こ
の下の中間ダイ(3)、この下の下ダイ(4)からな
り、下ダイ(4)の下には基盤(16)が配設され、上ダ
イ(2)には後述するビレット(A)から予備成形され
たピストンの成形素材(B)を密に嵌合する孔(2a)を
備える。中間ダイ(3)には孔(2a)と同心の摺動孔
(3a)を備え、孔(3a)の中間部乃至下部は連続して末
広がりの凹部(3b)が形成され、凹部(3b)図中左側斜
面(3c)が浅く、右側斜面(3d)が深く、下ダイ(4)
には大径の空間部(4a)が上下に貫通するように設けら
れている。
FIG. 1 is a vertical cross-sectional front view of a piston forging die according to the present invention. Explaining this, the die (1) includes an upper die (2), a lower intermediate die (3), and a lower lower die. (4), the base (16) is disposed under the lower die (4), and the upper die (2) is provided with the piston forming material (B) preformed from the billet (A) described later. It has a hole (2a) which is closely fitted. The intermediate die (3) is provided with a sliding hole (3a) which is concentric with the hole (2a), and a concave portion (3b) is formed continuously in the middle or lower part of the hole (3a) to form a concave portion (3b). In the figure, the left slope (3c) is shallow, the right slope (3d) is deep, and the lower die (4)
Is provided with a large-diameter space (4a) so as to vertically pass therethrough.

上ダイ(2)上方にはこれの孔(2a)と摺動自在に嵌合
する上パンチ(5)が配設され、上パンチ(5)は上部
の基部(5a)を昇降枠(6)下面にホルダ(6a)を介し
て垂下保持され、昇降枠(6)の下面左右にはロッド状
のカム(7),(7)が垂下設置され、カム(7),
(7)の下面には各面側に対照的に斜面としたカム面
(7a),(7a)が形成されている。上ダイ(2)の下部
には孔(2a)の下部を挟むように180゜離間して横孔状
のガイド孔(2b),(2b)が形成され、これにサイドパ
ンチ(8),(8)が水平方向に摺動自在に嵌合され、
サイドパンチ(8),(8)の対向する先端部には小径
のピストンピンボス部成形用の成形部(8a),(8a)が
形成されている。又ガイド孔(2b),(2b)の各外方に
延出されたサイドパンチ(8),(8)の基部には前記
カム(7),(7)とカム面(7a),(7a)が係合する
斜面からなるカム部(8b),(8b)が設けられ、成形部
(8a),(8a)の基部は径方向外方にのびるフラットな
肩(8c),(8c)とする。
An upper punch (5) slidably fitted in the hole (2a) is arranged above the upper die (2), and the upper punch (5) moves an upper base (5a) to a lifting frame (6). It is suspended from the lower surface via a holder (6a), and rod-shaped cams (7), (7) are suspended from the lower surface of the elevating frame (6).
On the lower surface of (7), cam surfaces (7a) and (7a), which are inclined surfaces, are formed on the respective surface sides in contrast. The lower part of the upper die (2) is formed with lateral hole-shaped guide holes (2b), (2b) 180 ° apart so as to sandwich the lower part of the hole (2a), and side punches (8), ( 8) is horizontally slidably fitted,
Formed portions (8a) and (8a) for forming the piston pin boss portion having a small diameter are formed at the end portions of the side punches (8) and (8) facing each other. The side punches (8) and (8) extending outward from the guide holes (2b) and (2b) have bases of the cams (7) and (7) and cam surfaces (7a) and (7a). ) Is provided with a cam portion (8b), (8b) consisting of an inclined surface, and the bases of the molding portions (8a), (8a) are flat shoulders (8c), (8c) extending outward in the radial direction. To do.

下パンチ(9)は上パンチ(5)と対向する如く設けら
れ、鍛造セット位置で上部の成形部(9a)が上ダイ
(2)の孔(2a)中間部乃至下部に臨み、中間部(9b)
が中間ダイ(3)の孔(3b)に摺動自在に嵌合する如く
臨む。パンチ(9)は左右の側部材(10),(11)と、
中間部材(12)との分割された三部材からなる。側部材
(10),(11)の上部には各外側方に対称的に膨出する
突部(10a),(11a)、この下の首部(10b),(11
b)、首部(10b),(11b)下の各外側方に対称的に傾
斜した基部(10c),(11c)を備え、首部(10b),(1
1b)はサイドパンチ(8),(8)の成形部に対応し、
側部材(10),(11)の対向する内側面はフラットで、
この間に中間部材(12)の上部(12a)が挟み込まれ、
これの頂部(12b)は側部材(10),(11)の頂部(10
d),(11d)と連結面を構成する。
The lower punch (9) is provided so as to face the upper punch (5), and at the forging set position, the upper forming part (9a) faces the middle part or the lower part of the hole (2a) of the upper die (2), and the middle part ( 9b)
Faces so as to slidably fit in the hole (3b) of the intermediate die (3). The punch (9) has left and right side members (10), (11),
It is composed of three members divided from the intermediate member (12). Projections (10a), (11a) symmetrically bulging outwardly on the upper portions of the side members (10), (11), and necks (10b), (11) below them.
b), the necks (10b), (11b) are provided with symmetrically inclined bases (10c), (11c) on the outer sides, and the necks (10b), (1
1b) corresponds to the forming part of the side punches (8), (8),
The inner surfaces of the side members (10) and (11) facing each other are flat,
The upper part (12a) of the intermediate member (12) is sandwiched between them,
The top (12b) of this is the top (10) of the side members (10), (11).
It forms a connecting surface with d) and (11d).

側部材(10),(11)の基部(10c),(11c)基端には
各外方に延びて水平な成形素材下端受面(10e),(11
e)が形成され、これから孔(3a)内周に上部が接する
如くアーム部(10f),(11f)が垂下され、アーム部
(10f),(11f)の内側は中間部から下方にかけて凹部
(10g),(11g)を形成し、アーム部の下部(10h),
(11h)は対称的に各外方に拡開する如く屈曲せしめ
る。一方、中間部材(12)の中間部(12c)はアーム部
(10f),(11f)の中間部に両側が接する如くし、更に
下部(12d)は拡大して下部(10h),(11h)間に臨
み、中間部材(12)は固定で基盤(16)上に起設され
る。アーム部下部(10h),(11h)下端には凹部(10
i),(11i)を設け、これに基盤(16)内の左右に縦設
埋装せるシリンダ(13),(14)のロッド(13a),(1
4a)の上端(13c),(14c)を係合し、ロッド(13
a),(14a)の上端はピン(13b),(14d)で凹部(10
i),(11i)の縦壁に形成した長孔(10j),(11j)に
係合連結する。
The base parts (10c) and (11c) of the side members (10) and (11) extend horizontally outwardly at the base ends of the base parts (10e) and (11e).
e) is formed, and the arm portions (10f) and (11f) are drooped so that the upper portion is in contact with the inner circumference of the hole (3a), and the inner portions of the arm portions (10f) and (11f) are recessed from the middle portion to the lower portion ( 10g), (11g) and the lower part of the arm (10h),
(11h) should be bent symmetrically so that it expands outwards. On the other hand, the intermediate part (12c) of the intermediate member (12) is arranged so that both sides are in contact with the intermediate parts of the arm parts (10f) and (11f), and the lower part (12d) is enlarged to the lower parts (10h) and (11h). The intermediate member (12) is fixedly erected on the base (16) facing the space. The lower part of the arm (10h), (11h) has a recess (10
i), (11i), and rods (13a), (1) of cylinders (13), (14) which are vertically embedded in the base (16) on the bases (16).
4a) upper ends (13c) and (14c) are engaged, and rod (13c)
The upper ends of a) and (14a) are pin (13b) and (14d) at the recess (10
i) and (11i) are engaged and connected to the long holes (10j) and (11j) formed in the vertical walls.

以上により下パンチ(9)は図の如く、左右の部材(1
0),(11)が下限にあり、固定の中間部材(12)で頭
が左右に膨出した一体のパンチを形成し、一方、左右の
部材(10),(11)はシリンダ(13),(14)で中間部
材に対して左右個々に上昇動が可能で、第1図はワーク
のセット可能な状態を示す。
As a result, the lower punch (9) is
0) and (11) are at the lower limit, and a fixed intermediate member (12) forms an integral punch with the head bulging left and right, while the left and right members (10) and (11) are the cylinder (13). , (14) can be moved individually to the left and right with respect to the intermediate member, and FIG. 1 shows a state in which the work can be set.

次に以上の金型の作動を説明すると、予じめ第2図の如
くビレットと称される略円盤状の素材(A)を第3図の
如く予備成形してピストン成形素材(B)を得、成形素
材(B)は逆カップ状で頭部(B1)、軸方向に長いスカ
ート部(B2)、軸方向に短い厚肉部(B3)を90度位相を
ずらした位置に備える。
Next, the operation of the above-mentioned mold will be described. In advance, as shown in FIG. 2, a substantially disk-shaped material (A) called a billet is preformed as shown in FIG. 3 to form a piston molding material (B). As a result, the molding material (B) has an inverted cup shape with a head (B 1 ), an axially long skirt (B 2 ), and an axially short thick portion (B 3 ) at 90 ° phase-shifted positions. Prepare

尚、第3図の左半部と右半部は、位相を90度異ならせた
縦断面図である。
The left half part and the right half part of FIG. 3 are vertical cross-sectional views in which the phases are different by 90 degrees.

以上において、上ダイ(2)の孔(2a)上から成形素材
(B)を投入し、素材(B)は上限にある下パンチ
(9)の左右の側部材(10),(11)の受面(10e),
(11e)上にその下端が支持され、パンチ上部(9a)は
素材(B)の内径内に遊合されて頭部(B1)を下から支
持し、下パンチ(9)の成形部(9a)は一体化されかか
るセット状態を第4図で示した。
In the above, the forming material (B) is introduced from above the hole (2a) of the upper die (2), and the material (B) is at the upper limit of the left and right side members (10) and (11) of the lower punch (9). Receiving surface (10e),
The lower end of the punch (9e) is supported on (11e), and the upper part (9a) of the punch is loosely fitted in the inner diameter of the material (B) to support the head (B 1 ) from below. 9a) is integrated and the set state is shown in FIG.

次に上パンチ(5)を昇降枠(6)の下動で降下させ、
上パンチ(5)は上ダイ(2)の孔(2a)内に嵌合し、
成形素材(B)の頭部(B1)を上から押え、加圧する
が、一方、昇降枠(6)の下動でカム(7),(7)も
降下し、これの斜面(7a)がサイドパンチ(8),
(8)のカム部(8b)の斜面に係合し、この結果サイド
パンチ(8),(8)は対称的に内方に移動することと
なり、対向する先部の成形部(8a),(8a)が成形素材
(B)の外周から径方向内方に侵入し、厚肉部(B3)を
塑性変形させて内方に変形させ、厚肉部(B3)を下パン
チ(9)の側部材(10),(11)の首部(10b),(11
b)に押圧変形させ、一方、厚肉部(B3)に侵入した成
形部(8a)分の肉は上方にも流動しようとし、前進限の
成形部(8a)上方に内側の下パンチ(9)の側部材(1
0),(11)の突部(10a),(11a)が臨むのでこれの
下側に入り込み、突部(10a),(11a)を包み、他方、
サイドパンチ(8),(8)の成形部(8a)の基端の端
面(8c),(8c)が成形部(8a)が侵入成形限で素材
(B)の厚肉部(B3)の外周面に接してこれを加圧し、
肉の径方向外方への流動を規制する。これにより第11図
に示す如き成形品(C)のボス部(C4)凹部(C3)が成
形部により成形され、又突部(10a),(11a)でピンボ
ス部(C4)上方にアンダーカット凹部(C6)が形成さ
れ、又頭部(C1)はパンチ(5),(9)で加圧されて
成形され、凹部(C3)の壁(C5)は薄肉化される。これ
を第6図に示した。
Next, lower the upper punch (5) by lowering the elevating frame (6),
The upper punch (5) is fitted in the hole (2a) of the upper die (2),
The head (B 1 ) of the molding material (B) is pressed from above to apply pressure, but the cams (7) and (7) also descend due to the downward movement of the elevating frame (6), and the slope (7a) of this Side punch (8),
The side punches (8) and (8) are symmetrically moved inward as a result of being engaged with the sloped surface of the cam portion (8b) of (8). (8a) enters the radially inward from the outer periphery of the molding material (B), the thick portion (B 3) by plastically deforming to deform inward, thick portion (B 3) a lower punch (9 ) Side members (10), (11) neck (10b), (11
While pressing and deforming to b), the thickness of the forming part (8a) that has penetrated into the thick part (B 3 ) also tries to flow upward, and the inside lower punch (8a) above the forming part (8a) at the forward limit. 9) Side member (1
Since the protrusions (10a) and (11a) of 0) and (11) face, they enter underneath and wrap around the protrusions (10a) and (11a), while
Side punches (8), the end surface of the proximal end of the forming section of (8) (8a) (8c), the thick portion of the (8c) is molded portion (8a) is material intrusion molding limit (B) (B 3) Press this by contacting the outer peripheral surface of
Restricts the outward flow of meat in the radial direction. As a result, the recess (C 3 ) of the boss (C 4 ) of the molded product (C) as shown in FIG. 11 is molded by the molding, and the protrusions (10a), (11a) are located above the pin boss (C 4 ). An undercut recess (C 6 ) is formed in the underside, and the head (C 1 ) is pressed by the punches (5) and (9) to be molded, and the wall (C 5 ) of the recess (C 3 ) is thinned. To be done. This is shown in FIG.

成形後は上パンチ(5)を上昇させ、同時にサイドパン
チ(8),(8)を後退動させ、パンチ(5),
(8),(8)の拘束から成形品(C)を解放する。次
にシリンダ(13),(14)を駆動してロッド(13a),
(14a)を上昇させ、これに連なる下パンチ(9)の側
部材(10),(11)を上動させ、一方のアーム部(10
f)の下部(10h)が凹部(3b)のこの側の斜面(3c)に
当接し、一方、中間部材(12)は固定のためパンチの上
動で側部材(10),(11)の上部内側から摺動しながら
部材(10),(11)の凹部(10g),(11g)に臨み、こ
の状態で外れ、斜面(3c)の案内作用で側部材(10)は
反対側の側部材(11)方向に接近し、終には上部の内側
面(10k),(11k)が当接する。側部材(10)の図中右
方向への移動はロッド(13)のピン(13b)に対する係
合が長孔(10j)のため支障なくなされ、部材(10)の
部材(11)への当接で成形品(C)のアンダーカット凹
部(C6)の一方から突部(10a)が抜き出される。これ
を第8図で示した。
After the forming, the upper punch (5) is raised, and at the same time, the side punches (8), (8) are moved backward to move the punches (5),
The molded product (C) is released from the constraints of (8) and (8). Next, the cylinders (13) and (14) are driven to drive the rods (13a),
(14a) is lifted and the side members (10), (11) of the lower punch (9) connected to this are moved upward, and one arm portion (10)
The lower part (10h) of f) abuts the slope (3c) on this side of the recess (3b), while the intermediate member (12) is fixed by the upward movement of the punch for fixing the side members (10) and (11). While sliding from the inside of the upper part, it faces the recesses (10g) and (11g) of the members (10) and (11) and comes off in this state, and the side member (10) is on the opposite side due to the guiding action of the slope (3c). The members approach the direction of the member (11), and finally the inner surfaces (10k) and (11k) of the upper part abut. The movement of the side member (10) in the right direction in the figure is not hindered by the engagement of the rod (13) with the pin (13b) due to the long hole (10j), and the member (10) hits the member (11). while the projection (10a) is drawn of the undercut recess of the molded article (C) in contact (C 6). This is shown in FIG.

次に、図中左側の側部材(10)が斜面(3C)に当接して
上限位置に達すると、今度は当該側のシリンダ(13)を
降下作動させて側部材(10)を降下させるとともに、反
対側のシリンダ(14)を上昇作動させて図中右側の側部
材(11)を更に上昇させる。
Next, when the side member (10) on the left side of the drawing contacts the slope (3C) and reaches the upper limit position, this time, the cylinder (13) on the side is lowered and the side member (10) is lowered. , The cylinder (14) on the opposite side is moved up to further raise the side member (11) on the right side in the figure.

すると、左側の側部材(10)の突部(10a)はアンダー
カット凹部(C6)に干渉することなく、スムーズに成形
品(C)から抜き出される。
Then, projections of the left side member (10) (10a) without interfering with the undercut recess (C 6), is withdrawn from the smoothly molded article (C).

また、左側の側部材(10)の降下に伴って、当該側部材
(10)は外側に向けて偏寄可能となり、他方側の側部材
(11)の上昇に伴って該側部材(11)が内側に移動して
も、これに押された側部材(10)は外側に向けて逃げる
ことが出来、邪魔にならない。
Further, with the lowering of the left side member (10), the side member (10) can be biased outward, and as the other side member (11) rises, the side member (11). Even if is moved inward, the side member (10) pushed by this can escape toward the outside and is not an obstacle.

そして、この過程の途中を第9図に示す。And, the middle of this process is shown in FIG.

ところで、右側の側部材(11)によって成形品(C)が
持ち上げられると、その位置には次工程のハンドリング
を行うクランプ(15)が待機しており、成形品(C)は
このクランプ(15)によって把持される。
By the way, when the molded product (C) is lifted by the right side member (11), a clamp (15) for handling the next process stands by at that position, and the molded product (C) is held by this clamp (15). ).

そして、クランプ(15)は成形品(C)を把持すると、
成形品(C)を中央の位置に規制するようにしているた
め、内側に移動している側部材(11)の突部(11a)は
アンダーカット凹部(C6)から離れる。これを第10図に
示す。続いて部材(11)を下動させて成形位置にもど
し、成形品の払い出しを完了する。
When the clamp (15) holds the molded product (C),
Because it has to regulate molded article (C) to the center position, protrusion of the side members (11) which is moved inward (11a) is separated from the undercut recess (C 6). This is shown in FIG. Subsequently, the member (11) is moved down to the molding position and the delivery of the molded product is completed.

以上により第10図で示す如き成形品が得られ、成形品
(C)は薄肉部(C5)を穿孔してピストンピン孔を成形
し、又ピンボス部(C4)上方に既述のパンチ(9)の突
部(10a),(11a)でアンダーカット凹部(6)が形成
されることとなる。
As a result, a molded product as shown in FIG. 10 is obtained. The molded product (C) has a thin-walled portion (C 5 ) punched to form a piston pin hole, and the above-mentioned punch is provided above the pin boss portion (C 4 ). The undercut recess (6) is formed by the protrusions (10a) and (11a) of (9).

(発明の効果) 以上で明らかな如く本発明によれば、 ピストンの鍛造成形において、下パンチを中間の部材と
一対の外側部材によって分割構成するとともに、それぞ
れの外側部材を別個に昇降動自在且つ内側に向けて偏寄
可能にし、成形時はこれら中間の部材と外側部材を一体
化してピストン素材のカップ内に挿入して成形するとと
もに、成形後は各外側部材によって成形品を上方に持ち
上げることで、一方側の外側部材の突部をアンダーカッ
ト凹部から離脱させ、次いで他方側の外側部材のみを上
昇させて一方側の外側部材をカップ内から抜き出すよう
にしたため、アンダーカット部が大きくても、確実にこ
れを避けて抜き出すことが出来る。
(Effects of the Invention) As is apparent from the above, according to the present invention, in the forging of the piston, the lower punch is divided into the intermediate member and the pair of outer members, and each outer member is independently movable up and down. It can be biased toward the inside, and at the time of molding, these intermediate member and outer member are integrated and inserted into the cup of the piston material for molding, and after molding, the molded product is lifted up by each outer member. Therefore, the protrusion of the outer member on one side is separated from the undercut concave portion, and then only the outer member on the other side is lifted to pull out the outer member on one side from the inside of the cup. , You can definitely avoid this and extract it.

【図面の簡単な説明】[Brief description of drawings]

図面は本発明の一実施例を示すもので、第1図は金型の
縦断面図で、第2図は素材の図、第3図は予備成形素材
の断面図であって、左半部と右半部は位相を90度異なら
せたもの、第4図は成形装置の縦断面図で予備成形素材
セットの状態の図、第5図は下パンチの平面図、第6図
は成形状態の断面図、第7図は同下パンチとサイドパン
チの関係を示す横断平面図、第8図乃至第10図は成形品
払い出し工程を順を追って示した断面図、第11図は成形
品の断面図であって、左半部と右半部は位相を90度異な
らせたもの、第12図はピストンの断面図、第13図は同底
面図である。 尚図面中(B)はピストン素材、(C)は成形品、
(C3)はピンボス部用凹部、(C4)はボス部、(2)は
ダイ、(5)は上パンチ、(8)はサイドパンチ、
(9)は下パンチ、(10),(11),(12)は下パンチ
部材である。
The drawings show one embodiment of the present invention. Fig. 1 is a longitudinal sectional view of a mold, Fig. 2 is a drawing of a raw material, and Fig. 3 is a sectional view of a preforming material. And the right half part have different phases by 90 degrees. Fig. 4 is a vertical cross-sectional view of the forming device showing the state of the preforming material set. Fig. 5 is a plan view of the lower punch. Fig. 6 is the forming state. FIG. 7, a cross-sectional plan view showing the relationship between the lower punch and the side punch, FIGS. 8 to 10 are cross-sectional views showing the step of discharging the molded product in order, and FIG. 11 is a sectional view of the molded product. FIG. 12 is a cross-sectional view in which the left half part and the right half part have different phases by 90 degrees, FIG. 12 is a cross-sectional view of a piston, and FIG. 13 is a bottom view of the same. In the drawing, (B) is a piston material, (C) is a molded product,
(C 3 ) is a recess for the pin boss portion, (C 4 ) is a boss portion, (2) is a die, (5) is an upper punch, (8) is a side punch,
(9) is a lower punch, and (10), (11) and (12) are lower punch members.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 渡辺 孝一 埼玉県狭山市新狭山1丁目10番地1 ホン ダエンジニアリング株式会社内 (72)発明者 高井 努 埼玉県狭山市新狭山1丁目10番地1 ホン ダエンジニアリング株式会社内 (56)参考文献 特開 昭60−18247(JP,A) 特開 昭49−119849(JP,A) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koichi Watanabe 1-10-1 Shin-Sayama, Sayama-shi, Saitama Prefecture Within Honda Engineering Co., Ltd. (72) Tsutomu Takai 1-10-1 Shin-sayama, Sayama-shi, Saitama Prefecture Within Da Engineering Co., Ltd. (56) Reference JP-A-60-18247 (JP, A) JP-A-49-119849 (JP, A)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】逆カップ状のピストン素材(B)のカップ
内に挿入されてカップ内面を拘束する下パンチ(9)
と、ピストン素材(B)の上面(B1)を拘束・加圧する
昇降動自在な上パンチ(5)と、ピストン素材(B)の
外周側面にピストンボス部用の凹部(C3)を成形する進
退動自在な一対のサンドパンチ(8)を備えたピストン
鍛造用金型において、前記下パンチ(9)を中間の部材
(12)と、この中間の部材(12)に対して相対的に昇降
動し且つ上端に突部(10a),(11a)を備えた一対の外
側部材(10),(11)に分割構成して、これら外側部材
(10),(11)を別個に昇降動可能にするとともに、各
外側部材(10),(11)を内側に向けて偏寄可能にし、
これら外側部材(10),(11)を下降させて中間の部材
(12)と一体化して成形品(C)を成形することで前記
突部(10a),(11a)によってカップ内面にアンダーカ
ット凹部(C6)を形成し、次いで各外側部材(10),
(11)を上昇させて一方側の外側部材(10)の突部(10
a)をアンダーカット凹部(C6)から離脱させ、更に他
方側の外側部材(11)のみを上昇させて前記一方側の外
側部材(10)を成形品(C)のカップ内から抜き出すよ
うにしたことを特徴とするピストン鍛造用金型。
1. A lower punch (9) which is inserted into a cup of an inverted cup-shaped piston material (B) to restrain the inner surface of the cup.
And an upper punch (5) that can move up and down to restrain and press the upper surface (B 1 ) of the piston material (B), and a recess (C 3 ) for the piston boss on the outer peripheral side surface of the piston material (B). In a die for piston forging provided with a pair of sand punches (8) that can be moved back and forth, the lower punch (9) is relatively positioned with respect to an intermediate member (12) and the intermediate member (12). A pair of outer members (10) and (11) that move up and down and have protrusions (10a) and (11a) at the upper end are separately configured, and these outer members (10) and (11) are moved up and down separately. While making it possible, each outer member (10), (11) can be biased toward the inside,
These outer members (10), (11) are lowered and integrated with the intermediate member (12) to form a molded product (C), whereby the protrusions (10a), (11a) undercut the inner surface of the cup. Forming a recess (C 6 ) and then each outer member (10),
(11) is lifted and the protrusion (10) of the outer member (10) on one side is raised.
a) is removed from the undercut recess (C 6 ), and only the outer member (11) on the other side is raised so that the outer member (10) on the one side can be pulled out from the cup of the molded product (C). A die for piston forging characterized by doing
JP61267012A 1986-11-10 1986-11-10 Piston forging die Expired - Fee Related JPH0673711B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61267012A JPH0673711B2 (en) 1986-11-10 1986-11-10 Piston forging die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61267012A JPH0673711B2 (en) 1986-11-10 1986-11-10 Piston forging die

Publications (2)

Publication Number Publication Date
JPS63119943A JPS63119943A (en) 1988-05-24
JPH0673711B2 true JPH0673711B2 (en) 1994-09-21

Family

ID=17438832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61267012A Expired - Fee Related JPH0673711B2 (en) 1986-11-10 1986-11-10 Piston forging die

Country Status (1)

Country Link
JP (1) JPH0673711B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011115048A1 (en) * 2011-10-07 2013-04-11 Mahle International Gmbh A forging apparatus for producing a piston blank and a method for producing the piston blank using the forging apparatus
CN112222342B (en) * 2020-09-11 2022-07-01 郑州机械研究所有限公司 Hot extrusion forming device and process for steel diesel engine piston

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310983A1 (en) * 1973-03-06 1974-09-12 Rheinstahl Ag Forging profiled rolls - billet forged first to preform then to final shape
JPS6018247A (en) * 1983-07-12 1985-01-30 Toyota Motor Corp Working device for outer ring of synchronous universal joint

Also Published As

Publication number Publication date
JPS63119943A (en) 1988-05-24

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