JP4274439B2 - Molding equipment for closed forging - Google Patents

Molding equipment for closed forging Download PDF

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JP4274439B2
JP4274439B2 JP2005316708A JP2005316708A JP4274439B2 JP 4274439 B2 JP4274439 B2 JP 4274439B2 JP 2005316708 A JP2005316708 A JP 2005316708A JP 2005316708 A JP2005316708 A JP 2005316708A JP 4274439 B2 JP4274439 B2 JP 4274439B2
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piston
hydraulic chamber
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邦彦 田中
勇 松本
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Komatsu Ltd
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Description

この発明は分流閉塞鍛造に使用する鍛造用金型装置に関する。   The present invention relates to a forging die apparatus used for shunt blockage forging.

従来ギヤなどの機械部品を鍛造により製作する方法としては、例えば特許文献１や特許文献２に記載されたものが公知である。   Conventionally, as a method of manufacturing mechanical parts such as gears by forging, for example, those described in Patent Document 1 and Patent Document 2 are known.

上記特許文献１の平歯車の鍛造方法は、素材を得るべき平歯車の歯車形状の歯輪郭より小さく設定した歯車形状を有する一次加工歯車に据え込み成形する第１の加工工程、一次加工歯車に歯形以外の部分で材料を自由に流動させつつ二次加工歯車に圧縮成形する第２の加工工程、二次加工歯車を最終製品にしごき成形する第３の加工工程とからなり、これらの各工程を冷間鍛造加工で行うことを特徴とするもので、しごき成形時のしごき代が安定して形成されるため、低荷重により高精度の製品が得られる効果がある。
また上記特許文献２の押出し加工方法は、穴部を有するパンチにより押出し成形して、パンチの穴部より凸部を形成すると共に、この部分の凸部解放端を所定圧力で加圧した状態で押出加工し、加工終了前に圧力を低減または除去するようにした方法であり、下死点付近で金型に作用する最大荷重を大幅に低減できる効果を有する。 The spur gear forging method of Patent Document 1 described above is a first machining step in which a primary working gear is formed by upsetting into a primary gear having a gear shape set smaller than the gear-shaped tooth profile of the spur gear from which a material is to be obtained. Each of these steps comprises a second processing step in which a material is freely flowed in a portion other than the tooth profile and compression-molded into a secondary processing gear, and a third processing step in which the secondary processing gear is cast into a final product. Is performed by cold forging, and the ironing allowance at the time of ironing is formed stably, so that there is an effect that a highly accurate product can be obtained with a low load.
Moreover, the extrusion method of the above-mentioned patent document 2 is formed by extruding with a punch having a hole, forming a convex part from the hole part of the punch, and pressurizing the convex part release end of this part with a predetermined pressure. This is a method of extruding and reducing or removing the pressure before the end of processing, and has the effect of greatly reducing the maximum load acting on the mold near the bottom dead center.

特開平５−１５４５９８号公報JP-A-5-154598 特許第２５３４８９９号公報Japanese Patent No. 2534899

しかし特許文献１の鍛造方法では、予め得ようとする平歯車の歯車形状の歯輪郭より小さく素材を成形しているため、素材を歯車形状に成形するのに１〜２工程を必要とする上、素材の鍛造にも３工程を必要とするなど、工程数が多いため、鍛造に時間がかかり生産性が悪い不具合がある。   However, in the forging method of Patent Document 1, since the material is formed smaller than the gear-shaped tooth profile of the spur gear to be obtained in advance, one or two steps are required to form the material into a gear shape. Since the number of processes is large, for example, the forging of the material requires 3 processes, forging takes time and the productivity is poor.

また各工程毎にパンチを交換して鍛造を行うため、交換作業が煩雑となる上、予め複数種のパンチやマンドレルを用意する必要があるため、金型代も嵩むなどの不具合もある。   In addition, since the forging is performed by exchanging the punches for each process, the replacement work becomes complicated, and it is necessary to prepare a plurality of types of punches and mandrels in advance.

一方特許文献２の押出し加工方法では、上パンチに設けられた加圧部材により、素材の流動を一部拘束しながら後方押出しを行い、加工終了前に加圧部材の加圧力を低減または除去するようにしたことから、成形開始時から高い面圧が金型に作用し、これによって金型が焼付いたり、金型の寿命が早期に低下するなどの不具合がある。
また上記公報の押出し加工方法では、上パンチ側にのみ加圧部材を設けた構成のため、上パンチと下パンチの加圧力が不均一となって材料が一方向へのみ流動することから、得られた製品のファイバーフローが不均一となって、製品の強度が低下したり、製品中にクラックやヒケなどの欠陥が発生しやすいなどの不具合もある。 On the other hand, in the extrusion method of Patent Document 2, the pressing member provided on the upper punch performs backward extrusion while partially restricting the flow of the material, and reduces or eliminates the pressing force of the pressing member before the end of processing. As a result, a high surface pressure acts on the mold from the start of molding, thereby causing problems such as seizing the mold and shortening the life of the mold early.
In the extrusion method of the above publication, since the pressure member is provided only on the upper punch side, the pressurizing force of the upper punch and the lower punch is non-uniform and the material flows only in one direction. The product has a non-uniform fiber flow, resulting in a decrease in strength of the product and defects such as cracks and sink marks in the product.

この発明はかかる不具合を改善するためになされたもので、加圧手段により高い閉塞力が得られるようにした閉塞鍛造用金型装置を提供して、欠肉のない品質の良好な機械部品が容易に得られるようにすることを目的とする。   The present invention was made to remedy such problems, and provides a closed forging die device that can obtain a high closing force by means of a pressurizing means. The purpose is to make it easy to obtain.

上記目的を達成するため請求項１記載の発明は、スライド６側に取付けられた上型１のキャビティ１ａと、ボルスタ１７側に設置された下型２のキャビティ２ａを閉塞し、かつ上型１及び下型２に設けられた上カウンタパンチ８及び下カウンタパンチ２２でキャビティ１ａ，２ａ内のワーク７を加圧分流してワーク７を閉塞鍛造する閉塞鍛造用金型装置において、
上記スライド６下面に上部シリンダブロック５を介して上部支持部材４を取付け、この上部支持部材４内に収容した第１の昇降部材４ａの下面に、上記上型１を取付け、
上記上部シリンダブロック５に第１の外側シリンダ１１を設け、この第１の外側シリンダ１１内に第１のピストン１１ｂを上下摺動自在で、かつ第１の油圧室１１ｃ内の圧油で下方に移動するように収容し、この第１のピストン１１ｂの下面を第１の作動ピストン１０に当接すると共に、その第１の作動ピストン１０を上記第１の昇降部材４ａの上面に当接し、上記第１の油圧室１１ｃ内に圧油を供給する油圧発生装置２５を設けて上記上型１を上方より加圧する加圧手段とし、
上記第１の外側シリンダ１１の中心部に第１の内側シリンダ１２を設け、この第１の内側シリンダ１２内に、上記上カウンタパンチ８を下方に押す第２のピストン１２ａを上下摺動自在に収容し、この第２のピストン１２ａを下方に移動する第２の油圧室１２ｂへの圧油の充満、およびタンク（３５）へのドレーンを行う油圧発生装置２５を設けて、上記上カウンタパンチ８に背圧を付与する背圧付与手段とし、
上記ボルスタ１７上面に下部シリンダブロック１６を介して下部支持部材１４を取付け、この下部支持部材１４内に収容した第２の昇降部材１４ａの上面に、上記下型２を取付け、
上記下部シリンダブロック１６に第２の外側シリンダ１９を取付け、この第２の外側シリンダ１９内に第３のピストン１９ｂを上下摺動自在で、かつ第３の油圧室１９ｃ内の圧油で上方に移動するように収容し、この第３のピストン１９ｂの上面を第２の作動ピストン１８に当接すると共に、その第２の作動ピストン１８を上記第２の昇降部材１４ａの下面に当接し、上記第３の油圧室１９ｃ内に圧油を供給する油圧発生装置２５を設けて上記下型２を下方より加圧する加圧手段とし、
上記第２の外側シリンダ１９の中心部に第２の内側シリンダ２０を設け、この第２の内側シリンダ２０内に、上記下カウンタパンチ２２を上方に押す第４のピストン２０ａを上下摺動自在に収容し、この第４のピストン２０ａを上方に移動する第４の油圧室２０ｂへの圧油の充満、およびタンク（３５）へのドレーンを行う油圧発生装置２５を設けて、上記下カウンタパンチ２２に背圧を付与する背圧付与手段とし、
上記スライド６が下降するとき、上記第１の油圧室１１ｃに圧油を供給して第１のピストン１１ｂを下方に移動し、かつ上記第３の油圧室１９ｃに圧油を供給して第３のピストン１９ｂを上方に移動して加圧手段により上型１、下型２を上下方向より加圧してキャビティ１ａ，２ａを両側閉塞するとともに、上記第２の油圧室１２ｂに圧油を充満して上カウンタパンチ８に背圧を付与し、かつ上記第４の油圧室２０ｂに圧油を充満して下カウンタパンチ２２に背圧を付与してキャビティ１ａ，２ａ内のワーク７を加圧分流し、上記スライド６が上昇する前で、かつ上記キャビティ１ａ，２ａ内にワーク７が充満されたら上記第２の油圧室１２ｂ及び第４の油圧室２０ｂ内の圧油をタンク３５へドレーンさせ、背圧を除圧する構成としたことを特徴とする閉塞鍛造用金型装置である。 In order to achieve the above object, the invention according to claim 1 closes the cavity 1a of the upper mold 1 attached to the slide 6 side and the cavity 2a of the lower mold 2 installed on the bolster 17 side, and And a closed forging die apparatus for closing and forging the work 7 by pressurizing and diverting the work 7 in the cavities 1a and 2a with the upper counter punch 8 and the lower counter punch 22 provided in the lower mold 2,
The upper support member 4 is attached to the lower surface of the slide 6 via the upper cylinder block 5, and the upper mold 1 is attached to the lower surface of the first elevating member 4a accommodated in the upper support member 4.
The upper cylinder block 5 is provided with a first outer cylinder 11, and the first piston 11b can be slid up and down in the first outer cylinder 11 and is moved downward by the pressure oil in the first hydraulic chamber 11c. The first piston 11b is brought into contact with the lower surface of the first working piston 10, and the first working piston 10 is brought into contact with the upper surface of the first elevating member 4a. A hydraulic pressure generating device 25 for supplying pressure oil in the hydraulic chamber 11c of the first hydraulic chamber 11c, and pressurizing the upper mold 1 from above;
A first inner cylinder 12 is provided at the center of the first outer cylinder 11, and a second piston 12a that pushes the upper counter punch 8 downward is slidable up and down in the first inner cylinder 12. The upper counter punch 8 is provided with a hydraulic pressure generating device 25 that accommodates and fills the second hydraulic chamber 12b that moves the second piston 12a downward and fills the pressure oil and drains the tank (35). As a back pressure applying means for applying back pressure to
The lower support member 14 is attached to the upper surface of the bolster 17 via the lower cylinder block 16, and the lower mold 2 is attached to the upper surface of the second elevating member 14a accommodated in the lower support member 14.
A second outer cylinder 19 is attached to the lower cylinder block 16, and a third piston 19b can be slid up and down in the second outer cylinder 19 and is moved upward by pressure oil in the third hydraulic chamber 19c. The upper surface of the third piston 19b is in contact with the second operating piston 18, and the second operating piston 18 is in contact with the lower surface of the second elevating member 14a. 3 is provided with a hydraulic pressure generator 25 for supplying pressure oil in the hydraulic chamber 19c, and pressurizes the lower mold 2 from below.
A second inner cylinder 20 is provided at the center of the second outer cylinder 19, and a fourth piston 20 a that pushes the lower counter punch 22 upward is slidable in the second inner cylinder 20. The lower counter punch 22 is provided with a hydraulic pressure generating device 25 that accommodates and fills the fourth hydraulic chamber 20b that moves upward through the fourth piston 20a and performs drainage to the tank (35). As a back pressure applying means for applying back pressure to
When the slide 6 descends, pressure oil is supplied to the first hydraulic chamber 11c to move the first piston 11b downward, and pressure oil is supplied to the third hydraulic chamber 19c to provide third pressure. The piston 19b is moved upward, the upper die 1 and the lower die 2 are pressurized from above and below by the pressurizing means to close the cavities 1a and 2a on both sides, and the second hydraulic chamber 12b is filled with pressure oil. The back pressure is applied to the upper counter punch 8, and the fourth hydraulic chamber 20b is filled with pressure oil to apply the back pressure to the lower counter punch 22 to pressurize the work 7 in the cavities 1a and 2a. Before the slide 6 ascends and when the work 7 is filled in the cavities 1a and 2a, the pressure oil in the second hydraulic chamber 12b and the fourth hydraulic chamber 20b is drained to the tank 35, It was configured to remove back pressure. It is a closed forging die apparatus according to symptoms.

請求項１に係る発明は、上記構成により、スライド６とともに上型１を下降させて、上型１と下型２を密着させたら、加圧手段で上型１と下型２をそれぞれ加圧してキャビティ１ａ，２ａを両側閉塞し、同時に背圧付与手段で上カウンタパンチ８と下カウンタパンチ２２でキャビティ１ａ，２ａ内のワークを上下方向より加圧してワークを両側分流させてキャビティ１ａ，２ａ内に流動させ、キャビティ１ａ，２ａ内にワークが充満したら、上下カウンタパンチ８，２２の背圧を除圧してキャビティ１ａ，２ａ内に異常高圧が発生しないようにしたもので、加圧手段により高圧の閉塞力が容易に得られるため、大型の機械部品なども容易に鍛造することができると共に、キャビティ内にワークが充満されたら、背圧付与手段の背圧を除圧するようにしたことから、異常高圧が発生して金型が破損したり、金型寿命が早期に低下することもない。   According to the first aspect of the present invention, when the upper mold 1 is lowered together with the slide 6 and the upper mold 1 and the lower mold 2 are brought into close contact with each other, the upper mold 1 and the lower mold 2 are pressurized by the pressurizing means. Then, the cavities 1a and 2a are closed on both sides, and at the same time, the work in the cavities 1a and 2a is pressurized in the vertical direction by the upper counter punch 8 and the lower counter punch 22 by the back pressure applying means, so When the workpieces are filled in the cavities 1a and 2a, the back pressure of the upper and lower counter punches 8 and 22 is removed so that no abnormally high pressure is generated in the cavities 1a and 2a. Since high-pressure closing force can be easily obtained, large machine parts can be easily forged, and when the work is filled in the cavity, the back pressure of the back pressure applying means is removed. Since was Unishi, or mold damage abnormally high pressure occurs, die life is not reduced at an early stage.

またスライドが下死点に達するまで、大きな閉塞力を確保することができるため、キャビティ内での材料の充満性が向上して、欠肉のない品質の良好な成形品が得られると共に、バリが発生することもないので、成形後バリを取り除くなどの作業も必要ない。   In addition, since a large closing force can be secured until the slide reaches the bottom dead center, the filling of the material in the cavity is improved, and a molded product having a good quality with no lack of wall is obtained. Therefore, it is not necessary to remove burrs after molding.

さらに上下加圧手段に同時に油圧を供給して、上下型を閉塞することができるため、１基の油圧発生装置で圧油の供給が可能になり、これによって設備費の削減が図れると共に、閉塞鍛造中のみ油圧を発生させればよいことから、金型取付け部品などを小型化でき、これによって金型装置の価格低減も図れるようになる。   Furthermore, since the upper and lower molds can be closed simultaneously by supplying hydraulic pressure to the upper and lower pressurizing means, it is possible to supply pressure oil with a single hydraulic generator, which can reduce equipment costs and block Since the hydraulic pressure only needs to be generated during forging, it is possible to reduce the size of the mold mounting parts and the like, thereby reducing the cost of the mold apparatus.

この発明の実施の形態を図１及び図２に示す図面を参照して詳述する。
図１は両側閉塞、両側分流により等速ジョイントのインナレースや、ベベルギヤ、フランジ部品などの機械部品（以下ワークという）を鍛造するための閉塞鍛造用金型装置の断面図、図２は油圧発生装置の回路図を示す。 An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS.
Fig. 1 is a cross-sectional view of a mold device for closed forging for forging machine parts (hereinafter referred to as workpieces) such as inner races of constant velocity joints, bevel gears, flange parts, etc. The circuit diagram of an apparatus is shown.

これら図において１は上型、２は下型で、上記上型１は上型ホルダ３を介して上部支持部材４の下面に着脱自在に取付けられており、上部支持部材４は上部シリンダブロック５を介して鍛造プレスのスライド６下面に取付けられている。
上記上型１の下面中央には、ワーク７を成形するキャビティ１ａが形成されていて、このキャビティ１ａ内には、上型１の中心部に上下摺動自在に支承された上カウンタパンチ８のテーパ状先端部８ａが上方より出没自在に突出するようになっている。 In these drawings, 1 is an upper mold, 2 is a lower mold, and the upper mold 1 is detachably attached to the lower surface of the upper support member 4 via an upper mold holder 3. The upper support member 4 is an upper cylinder block 5. Is attached to the lower surface of the slide 6 of the forging press.
A cavity 1a for forming the workpiece 7 is formed at the center of the lower surface of the upper mold 1. Inside the cavity 1a, an upper counter punch 8 supported at the center of the upper mold 1 is slidable in the vertical direction. The tapered tip portion 8a protrudes from the upper side so as to be able to protrude and retract.

上記上部支持部材４内には、上型１を昇降する昇降部材４ａが上昇自在に収容されていて、この昇降部材４ａの下面にホルダ３により上型１が取付けられており、昇降部材４ａの外周面には段部４ｂが形成されていて、この段部４ｂが係止リング４ｃに係止されることにより、昇降部材４ａが上部支持部材４内より脱落しないようになっていると共に、昇降部材４ａの上面には、複数の作動ピン１０の下端が当接されている。   An elevating member 4a for elevating and lowering the upper mold 1 is accommodated in the upper support member 4, and the upper mold 1 is attached to the lower surface of the elevating member 4a by a holder 3, and the elevating member 4a A step portion 4b is formed on the outer peripheral surface, and the step portion 4b is locked to the locking ring 4c, so that the elevating member 4a is prevented from falling out of the upper support member 4 and is moved up and down. The lower ends of the plurality of operating pins 10 are in contact with the upper surface of the member 4a.

上記各作動ピン１０は、シリンダブロック５内に設けられた外側シリンダ１１の端板１１ａを上下方向に貫通するように設けられており、上端面は外側シリンダ１１内に上下摺動自在に収容されたピストン１１ｂの下面に当接されている。
上記ピストン１１ｂの上側は油圧室１１ｃとなっていてシリンダブロック５内に形成された油路５ａ及び管路２９を介して図２に示す油圧発生装置２５に接続されている。 Each operating pin 10 is provided so as to penetrate the end plate 11a of the outer cylinder 11 provided in the cylinder block 5 in the vertical direction, and the upper end surface is accommodated in the outer cylinder 11 so as to be slidable in the vertical direction. It is in contact with the lower surface of the piston 11b.
The upper side of the piston 11 b is a hydraulic chamber 11 c and is connected to a hydraulic pressure generator 25 shown in FIG. 2 through an oil passage 5 a and a pipe 29 formed in the cylinder block 5.

また外側シリンダ１１の中心部には、内側シリンダ１２が設けられていて、この内側シリンダ１２内に上下摺動自在に収容されたピストン１２ａの下面は、押圧子１３を介して上カウンタパンチ８の上面に当接されていると共に、ピストン１２ａの中心部には、スライド６内に設けられたスライドノックアウト（図示せず）のノックアウトピン１４が上下摺動自在に貫通されている。
そして上記ピストン１２ａの上側は油圧室１２ｂとなっていて、予め油が充満されていると共に、シリンダブロック５内に形成された油路５ｂ及び途中に第１電磁弁３２とリリーフ弁３３が並列接続された管路３４を介して図２に示す油圧発生装置２５の油タンク３５に接続されている。 An inner cylinder 12 is provided at the center of the outer cylinder 11, and the lower surface of the piston 12 a accommodated in the inner cylinder 12 so as to be slidable in the vertical direction is connected to the upper counter punch 8 via a presser 13. While being in contact with the upper surface, a knockout pin 14 of a slide knockout (not shown) provided in the slide 6 is penetrated through the central portion of the piston 12a so as to be slidable in the vertical direction.
The upper side of the piston 12a is a hydraulic chamber 12b, which is filled with oil in advance, and an oil passage 5b formed in the cylinder block 5 and the first electromagnetic valve 32 and the relief valve 33 are connected in parallel. 2 is connected to the oil tank 35 of the hydraulic pressure generator 25 shown in FIG.

一方上記下型２は、下部支持部材１４内に昇降自在に収容された昇降部材１４ａの上面に下型ホルダ１５を介して取付けられており、下部支持部材１４は下部シリンダブロック１６を介して鍛造プレスのボルスタ１７上面に取付けられている。
上記昇降部材１４ａの外周面には段部１４ｂが形成されていて、この段部１４ｂが係止リング１４ｃに係止されることにより、昇降部材１４ａが上方へ抜け出さないようになっていると共に、昇降部材１４ａの上面には、複数の作動ピン１８の下端が当接されている。 On the other hand, the lower mold 2 is attached to the upper surface of an elevating member 14a accommodated in the lower support member 14 via a lower mold holder 15, and the lower support member 14 is forged via a lower cylinder block 16. It is attached to the upper surface of the bolster 17 of the press.
A step portion 14b is formed on the outer peripheral surface of the elevating member 14a, and the step portion 14b is locked to the locking ring 14c. Lower ends of a plurality of operating pins 18 are in contact with the upper surface of the elevating member 14a.

上記各作動ピン１８は、シリンダブロック１６内に設けられた外側シリンダ１９の端板１９ａを上下方向に貫通するように設けられており、下端面は外側シリンダ１９内に上下摺動自在に収容されたピストン１９ｂの上面に当接されている。
上記ピストン１９ｂの下側は油圧室１９ｃとなっていて、シリンダブロック１６内に形成された油路１６ａ及び管路２９を介して油圧発生装置２５に接続されている。 Each operating pin 18 is provided so as to penetrate the end plate 19a of the outer cylinder 19 provided in the cylinder block 16 in the vertical direction, and the lower end surface is accommodated in the outer cylinder 19 so as to be slidable in the vertical direction. In contact with the upper surface of the piston 19b.
The lower side of the piston 19 b is a hydraulic chamber 19 c and is connected to the hydraulic pressure generator 25 through an oil passage 16 a and a pipe 29 formed in the cylinder block 16.

また外側シリンダ１９の中心部には内側シリンダ２０が設けられていて、この内側シリンダ２０内に上下摺動自在に収容されたピストン２０ａの上面は、押圧子２１を介して下カウンタパンチ２２の下面に当接されている。
上記下カウンタパンチ２２の上端に形成されたテーパ状先端部２２ａは、下型２の上面に形成されたキャビティ２ａ内に下方より出没自在に突出されていると共に、上記ピストン２０ａの中心部には、ベッドに設けられたベッドノックアウト（ともに図示せず）のノックアウトピン２３が上下摺動自在に貫通されている。 Further, an inner cylinder 20 is provided at the center of the outer cylinder 19, and the upper surface of the piston 20 a accommodated in the inner cylinder 20 so as to be slidable in the vertical direction is disposed on the lower surface of the lower counter punch 22 via a presser 21. It is in contact with.
A tapered tip portion 22a formed at the upper end of the lower counter punch 22 protrudes from a lower portion into a cavity 2a formed on the upper surface of the lower die 2, and protrudes from the center of the piston 20a. A knockout pin 23 of a bed knockout (both not shown) provided on the bed is slidably penetrated.

そして上記ピストン２０ａの下側は油圧室２０ｂとなっていて、予め油が充満されていると共に、シリンダブロック１６内に形成された油路１６ｂ及び途中に第２電磁弁３６とリリーフ弁３７が並列接続された管路３８を介して油圧発生装置２５の油タンク３５に接続されている。   The lower side of the piston 20a is a hydraulic chamber 20b, which is prefilled with oil, and an oil passage 16b formed in the cylinder block 16 and a second electromagnetic valve 36 and a relief valve 37 in parallel. It is connected to the oil tank 35 of the hydraulic pressure generator 25 through the connected pipe line 38.

上記油圧発生装置２５は、図２に示すように径の異なるシリンダ２６ａ，２６ｂを有する中圧発生手段２６と、径の異なるシリンダ２７ａ，２７ｂを有する高圧発生手段２７を有していて、油圧ポンプ２８より小径側のシリンダ２６ｂ，２７ｂへ圧油が供給されることにより、大径側のシリンダ２６ａ，２７ａに中圧または高圧油が発生されるようになっており、これら中高圧発生手段２６，２７で発生された圧油は、管路２９を介して上型１側に設けられた外側シリンダ１１の油圧室１１ｃ及び下型２側に設けられた外側シリンダ１９の油圧室１９ｃへそれぞれ供給されるようになっている。   As shown in FIG. 2, the hydraulic pressure generating device 25 includes intermediate pressure generating means 26 having cylinders 26a and 26b having different diameters, and high pressure generating means 27 having cylinders 27a and 27b having different diameters. By supplying the pressure oil to the cylinders 26b, 27b on the smaller diameter side than 28, medium pressure or high pressure oil is generated in the large diameter cylinders 26a, 27a. The pressure oil generated in 27 is supplied to the hydraulic chamber 11c of the outer cylinder 11 provided on the upper die 1 side and the hydraulic chamber 19c of the outer cylinder 19 provided on the lower die 2 side through the pipe 29. It has become so.

なお図２中４０は中高圧発生手段２６，２７内の残圧を油タンク３５へ抜くための残圧抜出弁である。   In FIG. 2, reference numeral 40 denotes a residual pressure extracting valve for extracting the residual pressure in the medium and high pressure generating means 26 and 27 to the oil tank 35.

次に上記構成された閉塞鍛造用金型装置の作用を説明する。
スライド６が上死点に停止されている状態で、図示しないワーク搬送手段により下型２のキャビティ２ａ内にワーク７を搬入したら、スライド６と共に上型１を下降させ、上型１の下面を下型２の上面に密着させたら、この状態で中圧発生手段２６または高圧発生手段２７より圧油を外側シリンダ１１，１９の各油圧室１１ｃ，１９ｃへ同時に供給して、上型１と下型２を上下方向より加圧し、キャビティ１ａ，２ａを閉塞する（これを両側閉塞という）。 Next, the operation of the above-configured closed forging die apparatus will be described.
When the work 7 is loaded into the cavity 2a of the lower mold 2 by a work conveying means (not shown) while the slide 6 is stopped at the top dead center, the upper mold 1 is lowered together with the slide 6 so that the lower surface of the upper mold 1 is moved. When the upper mold 1 and the lower mold 2 are brought into close contact with each other, pressure oil is supplied simultaneously from the intermediate pressure generating means 26 or the high pressure generating means 27 to the hydraulic chambers 11c and 19c of the outer cylinders 11 and 19, respectively. The mold 2 is pressurized from above and below to close the cavities 1a and 2a (this is called double-side closing).

同時にキャビティ１ａ，２ａ内に突出する上カウンタパンチ８及び下カウンタパンチ２２の先端部８ａ，２２ａでキャビティ１ａ，２ａ内のワーク７を上下方向より背圧を付与して、ワーク７をキャビティ１ａ，２ａ内へ分流（これを両側分流という）させて、閉塞されたキャビティ１ａ，２ａ内でワーク７を鍛造する。   At the same time, the work 7 in the cavities 1a and 2a is given back pressure in the vertical direction by the tip portions 8a and 22a of the upper counter punch 8 and the lower counter punch 22 projecting into the cavities 1a and 2a. The work 7 is forged in the closed cavities 1a and 2a by diverting into 2a (this is called bilateral diversion).

そして分流されたワーク７がキャビティ１ａ，２ａ内に充満されて、内圧が上昇する直前に第１、第２電磁弁３２，３６を開放して、内側シリンダ１２，２０の油圧室１２ｂ，２０ｂの圧油を油タンク３５へドレンさせる。
これによって上下カウンタパンチ８，２２に付与されていた背圧が除圧されて、ワーク７の加圧分流が停止されるため、キャビティ１ａ，２ａの内圧上昇が抑制され、内圧が異常に上昇することにより生じる金型の破損などが防止される。 Then, the divided work 7 is filled in the cavities 1a and 2a, and the first and second electromagnetic valves 32 and 36 are opened immediately before the internal pressure rises, and the hydraulic chambers 12b and 20b of the inner cylinders 12 and 20 are opened. The pressure oil is drained to the oil tank 35.
As a result, the back pressure applied to the upper and lower counter punches 8 and 22 is removed, and the pressure distribution of the workpiece 7 is stopped, so that the increase in the internal pressure of the cavities 1a and 2a is suppressed, and the internal pressure rises abnormally. This prevents the mold from being damaged.

以上のようにしてワーク７の成形が完了すると、スライド６が上型１とともに上昇を開始するのに伴い、まずスライドノックアウトによりノックピン１４が押し下げられて、上型１に付着したワーク７がノックアウトされ、その後さらにスライド６が上昇するのに伴い、ベッドノックアウトによりノックアウトピン２３が押し上げられて下型２よりワーク７がノックアウトされた後、ワーク搬送装置により成形の完了したワーク７が搬出される。   When the forming of the work 7 is completed as described above, as the slide 6 starts to rise together with the upper mold 1, the knock pin 14 is first pushed down by the slide knockout, and the work 7 attached to the upper mold 1 is knocked out. Then, as the slide 6 further rises, the knockout pin 23 is pushed up by bed knockout and the workpiece 7 is knocked out from the lower mold 2, and then the workpiece 7 that has been molded is carried out by the workpiece transfer device.

以下上記動作を繰返すことにより、ワーク７を閉塞鍛造するもので、上下型１，２を両側閉塞すると同時に、上下カウンタパンチ１４，２２によりワーク７を両側分流させて鍛造を行うため、欠肉のない良質な成形品が得られるようになる。   By repeating the above operation, the workpiece 7 is closed and forged, and the upper and lower molds 1 and 2 are closed on both sides, and at the same time, the workpiece 7 is forked by the upper and lower counter punches 14 and 22, and forging is performed. There will be no good quality molded products.

この発明の実施の形態になる閉塞鍛造用金型装置の断面図である。1 is a cross-sectional view of a closed forging die device according to an embodiment of the present invention. この発明の実施の形態になる閉塞鍛造用金型装置に使用する油圧発生装置の回路図である。1 is a circuit diagram of a hydraulic pressure generator used in a closed forging die device according to an embodiment of the present invention. FIG.

符号の説明Explanation of symbols

１…上型、１ａ…キャビティ、２…下型、２ａ…キャビティ、６…スライド、７…ワーク、８…上カウンタパンチ、１１…加圧手段（外側シリンダ）、１２…背圧付与手段（内側シリンダ）、１７…ボルスタ、１９…加圧手段（外側シリンダ）、２０…背圧付与手段（内側シリンダ）、２２…下カウンタパンチ   DESCRIPTION OF SYMBOLS 1 ... Upper mold | type, 1a ... Cavity, 2 ... Lower mold | type, 2a ... Cavity, 6 ... Slide, 7 ... Workpiece | work, 8 ... Upper counter punch, 11 ... Pressurization means (outer cylinder), 12 ... Back pressure provision means (inner side) Cylinder), 17 ... bolster, 19 ... pressure means (outer cylinder), 20 ... back pressure applying means (inner cylinder), 22 ... lower counter punch

Claims (1)

スライド（６）側に取付けられた上型（１）のキャビティ（１ａ）と、ボルスタ（１７）側に設置された下型（２）のキャビティ（２ａ）を閉塞し、かつ上型（１）及び下型（２）に設けられた上カウンタパンチ（８）及び下カウンタパンチ（２２）でキャビティ（１ａ），（２ａ）内のワーク（７）を加圧分流してワーク（７）を閉塞鍛造する閉塞鍛造用金型装置において、
上記スライド（６）下面に上部シリンダブロック（５）を介して上部支持部材（４）を取付け、この上部支持部材（４）内に収容した第１の昇降部材（４ａ）の下面に、上記上型（１）を取付け、
上記上部シリンダブロック（５）に第１の外側シリンダ（１１）を設け、この第１の外側シリンダ（１１）内に第１のピストン（１１ｂ）を上下摺動自在で、かつ第１の油圧室（１１ｃ）内の圧油で下方に移動するように収容し、この第１のピストン（１１ｂ）の下面を第１の作動ピストン（１０）に当接すると共に、その第１の作動ピストン（１０）を上記第１の昇降部材（４ａ）の上面に当接し、上記第１の油圧室（１１ｃ）内に圧油を供給する油圧発生装置（２５）を設けて上記上型（１）を上方より加圧する加圧手段とし、
上記第１の外側シリンダ（１１）の中心部に第１の内側シリンダ（１２）を設け、この第１の内側シリンダ（１２）内に、上記上カウンタパンチ（８）を下方に押す第２のピストン（１２ａ）を上下摺動自在に収容し、この第２のピストン（１２ａ）を下方に移動する第２の油圧室（１２ｂ）への圧油の充満、およびタンク（３５）へのドレーンを行う油圧発生装置（２５）を設けて、上記上カウンタパンチ（８）に背圧を付与する背圧付与手段とし、
上記ボルスタ（１７）上面に下部シリンダブロック（１６）を介して下部支持部材（１４）を取付け、この下部支持部材（１４）内に収容した第２の昇降部材（１４ａ）の上面に、上記下型（２）を取付け、
上記下部シリンダブロック（１６）に第２の外側シリンダ（１９）を取付け、この第２の外側シリンダ（１９）内に第３のピストン（１９ｂ）を上下摺動自在で、かつ第３の油圧室（１９ｃ）内の圧油で上方に移動するように収容し、この第３のピストン（１９ｂ）の上面を第２の作動ピストン（１８）に当接すると共に、その第２の作動ピストン（１８）を上記第２の昇降部材（１４ａ）の下面に当接し、上記第３の油圧室（１９ｃ）内に圧油を供給する油圧発生装置（２５）を設けて上記下型（２）を下方より加圧する加圧手段とし、
上記第２の外側シリンダ（１９）の中心部に第２の内側シリンダ（２０）を設け、この第２の内側シリンダ（２０）内に、上記下カウンタパンチ（２２）を上方に押す第４のピストン（２０ａ）を上下摺動自在に収容し、この第４のピストン（２０ａ）を上方に移動する第４の油圧室（２０ｂ）への圧油の充満、およびタンク（３５）へのドレーンを行う油圧発生装置（２５）を設けて、上記下カウンタパンチ（２２）に背圧を付与する背圧付与手段とし、
上記スライド（６）が下降するとき、上記第１の油圧室（１１ｃ）に圧油を供給して第１のピストン（１１ｂ）を下方に移動し、かつ上記第３の油圧室（１９ｃ）に圧油を供給して第３のピストン（１９ｂ）を上方に移動して加圧手段により上型（１）、下型（２）を上下方向より加圧してキャビティ（１ａ），（２ａ）を両側閉塞するとともに、上記第２の油圧室（１２ｂ）に圧油を充満して上カウンタパンチ（８）に背圧を付与し、かつ上記第４の油圧室（２０ｂ）に圧油を充満して下カウンタパンチ（２２）に背圧を付与してキャビティ（１ａ），（２ａ）内のワーク（７）を加圧分流し、上記スライド（６）が上昇する前で、かつ上記キャビティ（１ａ），（２ａ）内にワーク（７）が充満されたら上記第２の油圧室（１２ｂ）及び上記第４の油圧室（２０ｂ）内の圧油をタンク（３５）へドレーンさせ、背圧を除圧する構成としたことを特徴とする閉塞鍛造用金型装置。 The upper mold (1) cavity (1a) mounted on the slide (6) side and the lower mold (2) cavity (2a) installed on the bolster (17) side are closed, and the upper mold (1) And the upper counter punch (8) and the lower counter punch (22) provided in the lower die (2), the work (7) in the cavities (1a) and (2a) is divided by pressurizing and the work (7) is closed. In the mold equipment for closed forging to forge,
The upper support member (4) is attached to the lower surface of the slide (6) via the upper cylinder block (5), and the upper surface of the first elevating member (4a) accommodated in the upper support member (4) is Install the mold (1),
A first outer cylinder (11) is provided in the upper cylinder block (5), and a first piston (11b) can be slid up and down in the first outer cylinder (11), and a first hydraulic chamber. (11c) is accommodated so as to move downward with the pressurized oil, the lower surface of the first piston (11b) is brought into contact with the first working piston (10), and the first working piston (10). Is provided in contact with the upper surface of the first elevating member (4a), and a hydraulic pressure generator (25) for supplying pressure oil into the first hydraulic chamber (11c) is provided so that the upper mold (1) is disposed from above. Pressurizing means to pressurize,
A first inner cylinder (12) is provided at the center of the first outer cylinder (11), and a second inner cylinder (12) is pushed secondly to push the upper counter punch (8) downward. The piston (12a) is accommodated slidably up and down, the second hydraulic chamber (12b) moving downward in the second piston (12a) is filled with pressure oil, and a drain to the tank (35) is provided. Providing a hydraulic pressure generating device (25) for performing back pressure application means for applying a back pressure to the upper counter punch (8);
A lower support member (14) is attached to the upper surface of the bolster (17) via a lower cylinder block (16), and the lower surface of the second elevating member (14a) accommodated in the lower support member (14) is Install the mold (2),
A second outer cylinder (19) is attached to the lower cylinder block (16), and a third piston (19b) can slide up and down in the second outer cylinder (19), and a third hydraulic chamber. (19c) is accommodated so as to move upward with the pressurized oil, and the upper surface of the third piston (19b) is brought into contact with the second working piston (18) and the second working piston (18). Is provided in contact with the lower surface of the second elevating member (14a), and a hydraulic pressure generator (25) for supplying pressure oil is provided in the third hydraulic chamber (19c) so that the lower mold (2) is moved downward. Pressurizing means to pressurize,
A second inner cylinder (20) is provided at the center of the second outer cylinder (19), and the lower counter punch (22) is pushed upward into the second inner cylinder (20). The piston (20a) is slidably accommodated up and down, the fourth hydraulic chamber (20b) that moves up the fourth piston (20a) is filled with pressure oil, and the drain to the tank (35) Providing a hydraulic pressure generating device (25) for performing back pressure application means for applying back pressure to the lower counter punch (22);
When the slide (6) descends, pressure oil is supplied to the first hydraulic chamber (11c) to move the first piston (11b) downward, and to the third hydraulic chamber (19c). Pressure oil is supplied and the third piston (19b) is moved upward, and the upper die (1) and the lower die (2) are pressurized in the vertical direction by the pressurizing means to thereby open the cavities (1a) and (2a). Both sides are closed, the second hydraulic chamber (12b) is filled with pressure oil to apply back pressure to the upper counter punch (8), and the fourth hydraulic chamber (20b) is filled with pressure oil. Then, back pressure is applied to the lower counter punch (22) to distribute the work (7) in the cavities (1a) and (2a) under pressure, and before the slide (6) is lifted, and before the cavity (1a ), (2a) when the work (7) is filled, the second hydraulic chamber (12b) and Serial fourth hydraulic chamber pressure oil in (20b) is drained to the tank (35), closed forging die apparatus that is characterized in that a configuration in which depressurized back pressure.
JP2005316708A 2005-10-31 2005-10-31 Molding equipment for closed forging Expired - Fee Related JP4274439B2 (en)

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CN103182423A (en) * 2011-12-27 2013-07-03 山西天宝风电法兰有限公司 Shaping die core for forging door frame flanges

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CN103056264B (en) * 2012-12-06 2015-01-21 周卫星 Closed cold-temperature precision forging die for straight-tooth bevel gear
CN115415745B (en) * 2022-09-09 2024-01-26 江苏双环齿轮有限公司 Production process of multi-step precision die forging with hole shafting

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103182423A (en) * 2011-12-27 2013-07-03 山西天宝风电法兰有限公司 Shaping die core for forging door frame flanges

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