JP5931513B2 - Press machine - Google Patents

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JP5931513B2
JP5931513B2 JP2012051266A JP2012051266A JP5931513B2 JP 5931513 B2 JP5931513 B2 JP 5931513B2 JP 2012051266 A JP2012051266 A JP 2012051266A JP 2012051266 A JP2012051266 A JP 2012051266A JP 5931513 B2 JP5931513 B2 JP 5931513B2
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hydraulic
knockout
hydraulic cylinder
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cylinders
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JP2013184195A (en
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雅信 美濃
雅信 美濃
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Kurimoto Ltd
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本発明は、油圧式ノックアウト装置を備えたプレス機械に関する。   The present invention relates to a press machine provided with a hydraulic knockout device.

鍛造プレスや板金プレス等のプレス機械は、成形された型内のワークをノックアウトピンで突き上げるノックアウト装置として、油圧シリンダを用いた油圧式ノックアウト装置を備えたものがある。この油圧式ノックアウト装置には、平行に配置した複数の油圧シリンダでノックアウトレバーを昇降させて、ノックアウトレバーに支持されたノックアウトピンで下型内のワークを突き上げるようにしたものがある（例えば、特許文献１参照）。   Some press machines such as forging presses and sheet metal presses include a hydraulic knockout device using a hydraulic cylinder as a knockout device that pushes a work in a molded die with a knockout pin. In this hydraulic knockout device, there is a device in which a knockout lever is lifted and lowered by a plurality of hydraulic cylinders arranged in parallel, and a workpiece in a lower mold is pushed up by a knockout pin supported by the knockout lever (for example, a patent) Reference 1).

特許文献１に記載されたものでは、油圧シリンダの昇降ストロークを検知する変位センサを設け、油圧サーボ制御手段によって、２つの油圧シリンダの作動ストロークを同期させて、トランスファプレスの複数の下型内に存在する各ワークを複数のノックアウトピンで突き上げ、トランスファビームの把持部で確実に把持するようにしている。   In the one described in Patent Document 1, a displacement sensor for detecting the lifting stroke of the hydraulic cylinder is provided, and the operating strokes of the two hydraulic cylinders are synchronized by the hydraulic servo control means, and are placed in a plurality of lower molds of the transfer press. Each existing workpiece is pushed up by a plurality of knockout pins and securely held by the transfer beam holding portion.

なお、油圧式ノックアウト装置には、ノックアウトピンを支持するノックアウトレバーを設けずに、複数の各油圧シリンダで直接ノックアウトピンを昇降させるようにしたものもある。   Some hydraulic knockout devices do not have a knockout lever for supporting the knockout pin, and the knockout pin is moved up and down directly by a plurality of hydraulic cylinders.

特許第２６９８０４０号公報Japanese Patent No. 2698040

特許文献１に記載された油圧式ノックアウト装置は、複数の油圧シリンダの作動ストロークを同期させるために、油圧シリンダの変位センサや油圧サーボ制御手段を必要とし、複雑な構成となって、メンテナンスに手間がかかるとともに、製造コストも高くなる問題がある。また、複数の油圧シリンダに個別に作動油を供給するので、作動油の量も多く必要とする。   In order to synchronize the operation strokes of a plurality of hydraulic cylinders, the hydraulic knockout device described in Patent Document 1 requires a displacement sensor and a hydraulic servo control means for the hydraulic cylinders. In addition, there is a problem that the manufacturing cost increases. Further, since the hydraulic oil is individually supplied to a plurality of hydraulic cylinders, a large amount of hydraulic oil is required.

そこで、本発明の課題は、簡単な構成で油圧式ノックアウト装置の複数の油圧シリンダの作動ストロークを同期させることである。   Accordingly, an object of the present invention is to synchronize the operation strokes of a plurality of hydraulic cylinders of a hydraulic knockout device with a simple configuration.

上記の課題を解決するために、本発明は、平行に配置した複数の油圧シリンダを作動させてノックアウトピンを昇降させ、下型内のワークを突き上げる油圧式ノックアウト装置を備えたプレス機械において、前記複数の油圧シリンダを同一断面積のものとし、この複数の油圧シリンダのうちの少なくとも２つの油圧シリンダについて、一方の油圧シリンダの２次油圧室と他方の油圧シリンダの１次油圧室とを連通する第１の油圧配管を設けた構成を採用した。   In order to solve the above problems, the present invention provides a press machine including a hydraulic knockout device that operates a plurality of hydraulic cylinders arranged in parallel to raise and lower a knockout pin and push up a workpiece in a lower mold. A plurality of hydraulic cylinders have the same cross-sectional area, and at least two of the plurality of hydraulic cylinders communicate with a secondary hydraulic chamber of one hydraulic cylinder and a primary hydraulic chamber of the other hydraulic cylinder. The configuration provided with the first hydraulic piping was adopted.

すなわち、複数の油圧シリンダを同一断面積のものとし、複数の油圧シリンダのうちの少なくとも２つの油圧シリンダについて、一方の油圧シリンダの２次油圧室と他方の油圧シリンダの１次油圧室とを連通する第１の油圧配管を設けることにより、一方の油圧シリンダを１次油圧室に作動油を供給して作動したときに、その２次油圧室から排出される作動油が他方の同一断面積の油圧シリンダの１次油圧室に供給され、油圧源からの作動油を一方の油圧シリンダの１次油圧室に供給するのみで、他方の油圧シリンダが自然に一方の油圧シリンダと同期したストロークで作動するようにし、簡単な構成で複数の油圧シリンダの作動ストロークを同期させることができるようにした。   That is, a plurality of hydraulic cylinders have the same cross-sectional area, and at least two of the plurality of hydraulic cylinders communicate with the secondary hydraulic chamber of one hydraulic cylinder and the primary hydraulic chamber of the other hydraulic cylinder. By providing the first hydraulic pipe, the hydraulic oil discharged from the secondary hydraulic chamber when one hydraulic cylinder is operated by supplying the hydraulic oil to the primary hydraulic chamber has the same cross-sectional area as the other. The hydraulic cylinder is supplied to the primary hydraulic chamber of the hydraulic cylinder, and only the hydraulic oil from the hydraulic source is supplied to the primary hydraulic chamber of one hydraulic cylinder, and the other hydraulic cylinder operates with a stroke that is naturally synchronized with one hydraulic cylinder. The operation strokes of a plurality of hydraulic cylinders can be synchronized with a simple configuration.

前記少なくとも２つの油圧シリンダの一方の油圧シリンダの１次油圧室と他方の油圧シリンダの２次油圧室とを連通する第２の油圧配管をさらに設け、前記第１と第２の油圧配管の連通を選択的に切り換える連通切り換え手段を設けることにより、第１の油圧配管のみでは閉回路となる一方の油圧シリンダの２次油圧室と他方の油圧シリンダの１次油圧室の間に存在する作動油を交換することができる。すなわち、油圧源からの作動油を他方の油圧シリンダの１次油圧室に供給して、一方の油圧シリンダを他方の油圧シリンダに同期させて作動することもできるようにし、前記閉回路となっていた一方の油圧シリンダの２次油圧室と他方の油圧シリンダの１次油圧室の間に存在した作動油をタンクに戻して交換することができる。   A second hydraulic pipe that communicates the primary hydraulic chamber of one of the at least two hydraulic cylinders with the secondary hydraulic chamber of the other hydraulic cylinder is further provided, and the first and second hydraulic pipes communicate with each other. Is provided between the secondary hydraulic chamber of one hydraulic cylinder and the primary hydraulic chamber of the other hydraulic cylinder, which is a closed circuit with only the first hydraulic piping. Can be exchanged. That is, hydraulic fluid from a hydraulic source is supplied to the primary hydraulic chamber of the other hydraulic cylinder so that one hydraulic cylinder can be operated in synchronization with the other hydraulic cylinder, and the closed circuit is formed. The hydraulic oil existing between the secondary hydraulic chamber of one hydraulic cylinder and the primary hydraulic chamber of the other hydraulic cylinder can be returned to the tank and replaced.

前記複数の油圧シリンダで昇降され、前記ノックアウトピンを支持するノックアウトバーを設け、このノックアウトバーを介して前記ノックアウトピンを昇降させることもできる。   A knockout bar that is raised and lowered by the plurality of hydraulic cylinders and supports the knockout pin may be provided, and the knockout pin may be raised and lowered via the knockout bar.

本発明に係るプレス機械は、油圧式ノックアウト装置の複数の油圧シリンダを同一断面積のものとし、複数の油圧シリンダのうちの少なくとも２つの油圧シリンダについて、一方の油圧シリンダの２次油圧室と他方の油圧シリンダの１次油圧室とを連通する第１の油圧配管を設けたので、簡単な構成で複数の油圧シリンダの作動ストロークを同期させることができる。   In the press machine according to the present invention, a plurality of hydraulic cylinders of a hydraulic knockout device have the same cross-sectional area, and at least two hydraulic cylinders of the plurality of hydraulic cylinders are connected to the secondary hydraulic chamber of one hydraulic cylinder and the other. Since the first hydraulic pipe communicating with the primary hydraulic chamber of the hydraulic cylinder is provided, the operation strokes of the plurality of hydraulic cylinders can be synchronized with a simple configuration.

プレス機械の実施形態を示す切欠き斜視図Cutaway perspective view showing an embodiment of a press machine 図１の油圧式ノックアウト装置の油圧シリンダの油圧回路図Hydraulic circuit diagram of the hydraulic cylinder of the hydraulic knockout device of FIG. （ａ）、（ｂ）は、図２の第１の油圧配管を用いてノックアウトバーを上昇、下降させる状態を示す油圧回路図(A), (b) is a hydraulic circuit diagram which shows the state which raises and lowers a knockout bar using the 1st hydraulic piping of FIG. （ａ）、（ｂ）は、図２の第２の油圧配管を用いてノックアウトバーを上昇、下降させる状態を示す油圧回路図(A), (b) is a hydraulic circuit diagram which shows the state which raises and lowers a knockout bar using the 2nd hydraulic piping of FIG.

以下、図面に基づき、本発明の実施形態を説明する。このプレス機械は、鍛造用のトランスファプレスであり、図１に示すように、複数の下金型（図示省略）が配列されるベッドフレーム１が左右のコラム２に差し渡して取り付けられ、ベッドフレーム１の下側に、各下金型内のワークを突き上げる油圧式ノックアウト装置１０を備えている。ベッドフレーム１の上方には、左右方向に延びる一対のトランスファバー３が設けられている。トランスファバー３は上下方向、前後方向および左右方向に３次元運動し、各下金型から突き上げられたワークを複数組のフィンガ３ａで把持して下流側の金型へ移送する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. This press machine is a transfer press for forging. As shown in FIG. 1, a bed frame 1 on which a plurality of lower dies (not shown) are arranged is attached to a left and right column 2 and attached. A hydraulic knockout device 10 that pushes up the workpiece in each lower mold is provided on the lower side. A pair of transfer bars 3 extending in the left-right direction is provided above the bed frame 1. The transfer bar 3 moves three-dimensionally in the up-down direction, the front-rear direction, and the left-right direction, grips the workpiece pushed up from each lower mold with a plurality of sets of fingers 3a, and transfers it to the downstream mold.

前記油圧式ノックアウト装置１０は、ベッドフレーム１の下側で左右方向に延びるノックアウトバー１１と、ノックアウトバー１１の上に支持された複数のノックアウトピン１２と、ノックアウトバー１１を介して各ノックアウトピン１２を昇降させる２つの同一断面積の油圧シリンダ１３、１４とからなる。各ノックアウトピン１２は、各下金型の下側でベッドフレーム１に設けられた貫通孔１ａに嵌挿され、各下金型内のワークを突き上げる。   The hydraulic knockout device 10 includes a knockout bar 11 extending in the left-right direction below the bed frame 1, a plurality of knockout pins 12 supported on the knockout bar 11, and each knockout pin 12 via the knockout bar 11. And two hydraulic cylinders 13 and 14 having the same cross-sectional area. Each knockout pin 12 is inserted into a through hole 1a provided in the bed frame 1 on the lower side of each lower mold, and pushes up a work in each lower mold.

図２は、前記油圧式ノックアウト装置１０の油圧シリンダ１３、１４の油圧回路図を示す。２つの油圧シリンダ１３、１４間には、油圧シリンダ１３の２次油圧室１３ｂと油圧シリンダ１４の１次油圧室１４ａとを連通する第１の油圧配管１５ａと、油圧シリンダ１３の１次油圧室１３ａと油圧シリンダ１４の２次油圧室１４ｂとを連通する第２の油圧配管１５ｂが設けられ、各油圧配管１５ａ、１５ｂには、これらの連通を選択的に切り換える連通切り換え手段としての遮断弁１６ａ、１６ｂが設けられている。また、各遮断弁１６ａ、１６ｂの両側は、それぞれ電磁弁１７ａ、１７ｂを介して、ポンプ１８とタンク１９に接続されている。   FIG. 2 is a hydraulic circuit diagram of the hydraulic cylinders 13 and 14 of the hydraulic knockout device 10. Between the two hydraulic cylinders 13 and 14, a first hydraulic pipe 15 a that communicates the secondary hydraulic chamber 13 b of the hydraulic cylinder 13 and the primary hydraulic chamber 14 a of the hydraulic cylinder 14, and the primary hydraulic chamber of the hydraulic cylinder 13. 13a and a secondary hydraulic chamber 14b of the hydraulic cylinder 14 are provided, and a second hydraulic pipe 15b is provided, and each hydraulic pipe 15a, 15b has a shut-off valve 16a as a communication switching means for selectively switching the communication. 16b are provided. Further, both sides of each shut-off valve 16a, 16b are connected to a pump 18 and a tank 19 via electromagnetic valves 17a, 17b, respectively.

図３（ａ）、（ｂ）は、前記遮断弁１６ｂで第２の油圧配管１５ｂを遮断し、第１の油圧配管１５ａを連通させた状態を示す。この状態でノックアウトバー１１を上昇させるときは、電磁弁１７ａを閉じて、ポンプ１８から電磁弁１７ｂを介して油圧シリンダ１３の１次油圧室１３ａに作動油を供給し、油圧シリンダ１３を上昇作動させる。このとき、油圧シリンダ１３の２次油圧室１３ｂから排出される作動油が、第１の油圧配管１５ａから同一断面積の油圧シリンダ１４の１次油圧室１４ａに供給され、油圧シリンダ１４が油圧シリンダ１３と同期したストロークで上昇作動する。油圧シリンダ１４の２次油圧室１４ｂから排出される作動油は、電磁弁１７ｂを介してタンク１９に戻される。   FIGS. 3A and 3B show a state in which the second hydraulic pipe 15b is shut off by the shutoff valve 16b and the first hydraulic pipe 15a is communicated. When the knockout bar 11 is raised in this state, the solenoid valve 17a is closed, the hydraulic oil is supplied from the pump 18 to the primary hydraulic chamber 13a of the hydraulic cylinder 13 via the solenoid valve 17b, and the hydraulic cylinder 13 is raised. Let At this time, the hydraulic oil discharged from the secondary hydraulic chamber 13b of the hydraulic cylinder 13 is supplied from the first hydraulic pipe 15a to the primary hydraulic chamber 14a of the hydraulic cylinder 14 having the same cross-sectional area, and the hydraulic cylinder 14 is hydraulic cylinder. Ascending operation with a stroke synchronized with 13. The hydraulic oil discharged from the secondary hydraulic chamber 14b of the hydraulic cylinder 14 is returned to the tank 19 via the electromagnetic valve 17b.

また、ノックアウトバー１１を下降させるときも電磁弁１７ａを閉じて、ポンプ１８から電磁弁１７ｂを介して油圧シリンダ１４の２次油圧室１４ｂに作動油を供給し、油圧シリンダ１４を下降作動させる。このとき、油圧シリンダ１４の１次油圧室１４ａから排出される作動油が第１の油圧配管１５ａから油圧シリンダ１３の２次油圧室１３ｂに供給され、油圧シリンダ１３が油圧シリンダ１４と同期したストロークで下降作動する。油圧シリンダ１３の１次油圧室１３ａから排出される作動油は、電磁弁１７ｂを介してタンク１９に戻される。   Also when the knockout bar 11 is lowered, the electromagnetic valve 17a is closed, and hydraulic oil is supplied from the pump 18 to the secondary hydraulic chamber 14b of the hydraulic cylinder 14 via the electromagnetic valve 17b, and the hydraulic cylinder 14 is lowered. At this time, hydraulic oil discharged from the primary hydraulic chamber 14 a of the hydraulic cylinder 14 is supplied from the first hydraulic pipe 15 a to the secondary hydraulic chamber 13 b of the hydraulic cylinder 13, and the stroke in which the hydraulic cylinder 13 is synchronized with the hydraulic cylinder 14. Moves down at. The hydraulic oil discharged from the primary hydraulic chamber 13a of the hydraulic cylinder 13 is returned to the tank 19 via the electromagnetic valve 17b.

図４（ａ）、（ｂ）は、前記遮断弁１６ａで第１の油圧配管１５ａを遮断し、第２の油圧配管１５ｂを連通させた状態を示す。この状態でノックアウトバー１１を上昇させるときは、電磁弁１７ｂを閉じて、ポンプ１８から電磁弁１７ａを介して油圧シリンダ１４の１次油圧室１４ａに作動油を供給し、油圧シリンダ１４を上昇作動させる。このとき、油圧シリンダ１４の２次油圧室１４ｂから排出される作動油が第２の油圧配管１５ｂから油圧シリンダ１３の１次油圧室１３ａに供給され、油圧シリンダ１３が油圧シリンダ１４と同期したストロークで上昇作動する。油圧シリンダ１３の２次油圧室１３ｂから排出される作動油は、電磁弁１７ａを介してタンク１９に戻される。 Figure 4 (a), (b) blocks the first hydraulic pipe 15 a in the shut-off valve 16 a, showing a state in which communicated the second hydraulic pipe 15 b. When the knockout bar 11 is raised in this state, the solenoid valve 17b is closed, the hydraulic oil is supplied from the pump 18 to the primary hydraulic chamber 14a of the hydraulic cylinder 14 via the solenoid valve 17a, and the hydraulic cylinder 14 is raised. Let me. At this time, hydraulic oil discharged from the secondary hydraulic chamber 14 b of the hydraulic cylinder 14 is supplied from the second hydraulic pipe 15 b to the primary hydraulic chamber 13 a of the hydraulic cylinder 13, and the stroke in which the hydraulic cylinder 13 is synchronized with the hydraulic cylinder 14. The ascending operation. The hydraulic oil discharged from the secondary hydraulic chamber 13b of the hydraulic cylinder 13 is returned to the tank 19 via the electromagnetic valve 17a.

また、ノックアウトバー１１を下降させるときも電磁弁１７ｂを閉じて、ポンプ１８から電磁弁１７ａを介して油圧シリンダ１３の２次油圧室１３ｂに作動油を供給し、油圧シリンダ１３を下降作動させる。このとき、油圧シリンダ１３の１次油圧室１３ａから排出される作動油が第２の油圧配管１５ｂから油圧シリンダ１４の２次油圧室１４ｂに供給され、油圧シリンダ１４が油圧シリンダ１３と同期したストロークで下降作動する。油圧シリンダ１４の１次油圧室１４ａから排出される作動油は、電磁弁１７ａを介してタンク１９に戻される。   Further, when the knockout bar 11 is lowered, the electromagnetic valve 17b is closed, the hydraulic oil is supplied from the pump 18 to the secondary hydraulic chamber 13b of the hydraulic cylinder 13 via the electromagnetic valve 17a, and the hydraulic cylinder 13 is lowered. At this time, hydraulic oil discharged from the primary hydraulic chamber 13 a of the hydraulic cylinder 13 is supplied from the second hydraulic pipe 15 b to the secondary hydraulic chamber 14 b of the hydraulic cylinder 14, and the stroke in which the hydraulic cylinder 14 is synchronized with the hydraulic cylinder 13. Moves down at. The hydraulic fluid discharged from the primary hydraulic chamber 14a of the hydraulic cylinder 14 is returned to the tank 19 via the electromagnetic valve 17a.

上述した図３の状態では、油圧シリンダ１３の２次油圧室１３ｂと油圧シリンダ１４の１次油圧室１４ａの間の第１の油圧配管１５ａが閉回路となり、図４の状態では、油圧シリンダ１３の１次油圧室１３ａと油圧シリンダ１４の２次油圧室１４ｂの間の第２の油圧配管１５ｂが閉回路となる。このため、これらの閉回路に存在する作動油はタンク１９に戻らないが、遮断弁１６ａ、１６ｂの遮断を切り換えて、図３と図４の状態を切り換えることにより、これらの閉回路に存在する作動油をタンク１９に戻して交換することができる。   In the state of FIG. 3 described above, the first hydraulic pipe 15a between the secondary hydraulic chamber 13b of the hydraulic cylinder 13 and the primary hydraulic chamber 14a of the hydraulic cylinder 14 is a closed circuit, and in the state of FIG. The second hydraulic pipe 15b between the primary hydraulic chamber 13a and the secondary hydraulic chamber 14b of the hydraulic cylinder 14 becomes a closed circuit. For this reason, the hydraulic oil existing in these closed circuits does not return to the tank 19, but exists in these closed circuits by switching the shut-off of the shut-off valves 16a and 16b and switching the states of FIGS. The hydraulic oil can be returned to the tank 19 for exchange.

上述したプレス機械は、２つの油圧シリンダを、１つの油圧シリンダを作動させるだけの油量で作動させることができるので、油圧配管のサイズを小さくできるとともに、ノックアウト動作を高速化することもできる。   The press machine described above can operate two hydraulic cylinders with an amount of oil sufficient to operate one hydraulic cylinder, so that the size of the hydraulic piping can be reduced and the knockout operation can be speeded up.

上述した実施形態では、油圧式ノックアウト装置の２つの油圧シリンダ間に第１と第２の油圧配管を設けたが、いずれか一方の油圧配管のみを設けることもできる。   In the embodiment described above, the first and second hydraulic pipes are provided between the two hydraulic cylinders of the hydraulic knockout device, but only one of the hydraulic pipes may be provided.

上述した実施形態では、油圧式ノックアウト装置に２つの油圧シリンダを設けたが、３つ以上の油圧シリンダを設けることもできる。例えば、３つの油圧シリンダを設けた場合は、第１と第２の油圧シリンダ間、第２と第３の油圧シリンダ間および第３と第１の油圧シリンダ間に、それぞれ第１と第２の油圧配管の少なくとも一方を設け、３つの油圧シリンダ間で順繰りに作動油を供給することもできる。また、４つの油圧シリンダを設けた場合は、第１と第２の油圧シリンダ間および第３と第４の油圧シリンダ間に、それぞれ第１と第２の油圧配管の少なくとも一方を設け、２つ１組とした油圧シリンダ間で作動油を供給することもできる。   In the embodiment described above, the two hydraulic cylinders are provided in the hydraulic knockout device, but three or more hydraulic cylinders may be provided. For example, when three hydraulic cylinders are provided, the first and second hydraulic cylinders are connected between the first and second hydraulic cylinders, between the second and third hydraulic cylinders, and between the third and first hydraulic cylinders, respectively. It is also possible to provide at least one of the hydraulic pipes and supply hydraulic oil in sequence between the three hydraulic cylinders. When four hydraulic cylinders are provided, at least one of the first and second hydraulic pipes is provided between the first and second hydraulic cylinders and between the third and fourth hydraulic cylinders. The hydraulic oil can be supplied between a set of hydraulic cylinders.

上述した実施形態では、プレス機械を鍛造用のトランスファプレスとし、ノックアウトバーに支持した複数のノックアウトピンを昇降させるようにしたが、プレス機械を１つの金型を有する単独プレスとし、１本のノックアウトピンを昇降させるようにすることもできる。また、ノックアウトバーをなくして、複数のノックアウトピンを直接個別に複数の油圧シリンダで昇降させることもできる。なお、プレス機械は板金プレスとすることもできる。   In the embodiment described above, the press machine is a transfer press for forging, and a plurality of knockout pins supported by the knockout bar are moved up and down. However, the press machine is a single press having one mold, and one knockout is performed. The pins can be raised and lowered. Further, the knockout bar can be eliminated, and the plurality of knockout pins can be lifted and lowered directly by a plurality of hydraulic cylinders. The press machine may be a sheet metal press.

１ ベッドフレーム
１ａ 貫通孔
２ コラム
３ トランスファバー
３ａ フィンガ
１０ 油圧式ノックアウト装置
１１ ノックアウトバー
１２ ノックアウトピン
１３、１４ 油圧シリンダ
１３ａ、１４ａ １次油圧室
１３ｂ、１４ｂ ２次油圧室
１５ａ、１５ｂ 油圧配管
１６ａ、１６ｂ 遮断弁
１７ａ、１７ｂ 電磁弁
１８ ポンプ
１９ タンク 1 Bed frame 1a Through hole 2 Column 3 Transfer bar 3a Finger 10 Hydraulic knockout device 11 Knockout bar 12 Knockout pins 13, 14 Hydraulic cylinders 13a, 14a Primary hydraulic chambers 13b, 14b Secondary hydraulic chambers 15a, 15b Hydraulic piping 16a, 16b Shut-off valve 17a, 17b Solenoid valve 18 Pump 19 Tank

Claims (2)

平行に配置した複数の油圧シリンダを作動させてノックアウトピンを昇降させ、下型内のワークを突き上げる油圧式ノックアウト装置を備えたプレス機械において、
前記複数の油圧シリンダを同一断面積のものとし、この複数の油圧シリンダのうちの少なくとも２つの油圧シリンダについて、一方の油圧シリンダの２次油圧室と他方の油圧シリンダの１次油圧室とを連通する第１の油圧配管を設け、且つ一方の油圧シリンダの１次油圧室と他方の油圧シリンダの２次油圧室とを連通する第２の油圧配管を設け、
前記第１の油圧配管の連通と、前記第２の油圧配管の連通とを選択的に切り換える連通切り換え手段を設けたことを特徴とするプレス機械。 In a press machine equipped with a hydraulic knockout device that operates a plurality of hydraulic cylinders arranged in parallel to raise and lower the knockout pin and push up the workpiece in the lower mold,
The plurality of hydraulic cylinders have the same cross-sectional area, and at least two hydraulic cylinders of the plurality of hydraulic cylinders communicate with the secondary hydraulic chamber of one hydraulic cylinder and the primary hydraulic chamber of the other hydraulic cylinder. And a second hydraulic pipe that communicates the primary hydraulic chamber of one hydraulic cylinder and the secondary hydraulic chamber of the other hydraulic cylinder,
A press machine comprising a communication switching means for selectively switching between communication of the first hydraulic piping and communication of the second hydraulic piping . 前記複数の油圧シリンダで昇降され、前記ノックアウトピンを支持するノックアウトバーを設け、このノックアウトバーを介して前記ノックアウトピンを昇降させるようにした請求項１に記載のプレス機械。 Wherein the lifting by a plurality of hydraulic cylinders, the knock-out bar is provided for supporting a knockout pin, a press machine according to claim 1 which is adapted to lift said knock-out pin through the knock-out bar.
JP2012051266A 2012-03-08 2012-03-08 Press machine Active JP5931513B2 (en)

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CN105855446B (en) * 2016-05-22 2017-10-24 上海大学 Material lifting mechanism of cold heading machine
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CN108708889B (en) * 2018-07-23 2020-01-14 武汉理工大学 Energy-saving type low-vibration fast-response hybrid control hydraulic press hydraulic system
CN112439859A (en) * 2020-10-28 2021-03-05 洛阳能惠自动化设备科技有限公司 A forging device that is used for damage prevention material of environmental protection material production

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