CN115026233B - Ring-forging hydraulic press and control method thereof - Google Patents
Ring-forging hydraulic press and control method thereof Download PDFInfo
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- CN115026233B CN115026233B CN202210598780.9A CN202210598780A CN115026233B CN 115026233 B CN115026233 B CN 115026233B CN 202210598780 A CN202210598780 A CN 202210598780A CN 115026233 B CN115026233 B CN 115026233B
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- 238000005242 forging Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004080 punching Methods 0.000 claims abstract description 47
- 239000003921 oil Substances 0.000 claims description 429
- 238000011010 flushing procedure Methods 0.000 claims description 49
- 239000007788 liquid Substances 0.000 claims description 28
- 239000010727 cylinder oil Substances 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 2
- 230000003139 buffering effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/06—Swaging presses; Upsetting presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
Abstract
The invention relates to the technical field of metal processing, in particular to a ring-forging hydraulic press and a control method thereof, the ring-forging hydraulic press comprises a plunger cylinder, a piston rod and a return cylinder, wherein the plunger cylinder comprises a cylinder body and a plunger rod with one end inserted in the cylinder body, one end of the plunger rod, which is far away from the cylinder body, is fixedly provided with a upsetting plate, the telescopic end of the return cylinder is connected to the upsetting plate for resetting the plunger rod, a piston cavity is formed in the plunger rod, the upper end of the piston rod is inserted in the piston cavity and is divided into a rodless cavity and a rod cavity by a piston head, the lower end of the piston rod penetrates through the upsetting plate and is provided with a pre-punching head, the cylinder body and the plunger rod are penetrated by a pre-punching oil pipe, the pre-punching oil pipe is used for communicating the rodless cavity with the outside, and the surface of the plunger rod is provided with a piston oil port communicated with the rod cavity.
Description
[ Field of technology ]
The invention relates to the technical field of metal processing, in particular to a ring forging hydraulic press and a control method thereof.
[ Background Art ]
At present, when annular blanks are processed, the blanks are heated to high temperature so as to facilitate upsetting processing of the blanks by using a hydraulic press, the upsetted blanks are transferred to another press by using a pre-punch of the press after upsetting the blanks, and the blanks placed in the pressing center of the press are pre-punched with blind holes.
[ Invention ]
The invention aims to solve the technical problems that the prior art is overcome, the ring-forging hydraulic press is provided, and the problems that the prior ring-forging processing equipment is more in equipment and high in manual labor intensity are solved when the workpiece is processed.
In order to solve the technical problems, the invention adopts the following technical scheme: the ring-forging hydraulic press comprises a plunger cylinder, a piston rod and a return oil cylinder, wherein the plunger cylinder comprises a cylinder body and a plunger rod, one end of the plunger rod is inserted into the cylinder body, one end of the plunger rod, far away from the cylinder body, is fixedly provided with a upsetting plate, the telescopic end of the return oil cylinder is connected onto the upsetting plate for resetting the plunger rod, a piston cavity is formed in the plunger rod, the upper end of the piston rod is inserted into the piston cavity, the piston cavity is divided into a rodless cavity and a rod cavity through a piston head, the lower end of the piston rod penetrates through the upsetting plate and is provided with a pre-punching head, the cylinder body and the plunger rod are penetrated through by a pre-punching oil pipe, the pre-punching oil pipe is used for communicating the rodless cavity with the outside, and a piston return oil port communicated with the rod cavity is formed in the surface of the plunger rod.
In the above hydraulic ring forging press, the upsetting plate comprises a sliding block fixedly connected with the lower end of the plunger rod and an upsetting cutting board arranged on the bottom surface of the sliding block, and the telescopic end of the return cylinder is connected with the sliding block.
In the ring forging hydraulic press, the piston head is fixedly sleeved at the position, close to the upper end, of the piston rod, a piston guide sleeve is arranged between the lower end of the piston head and the inner wall of the piston cavity, and the rod cavity is formed between the piston head and the piston guide sleeve.
In the above hydraulic ring forging press, the upper end of the piston rod is provided with an oil groove communicated with the rodless cavity, the lower end of the pre-flushing oil pipe is inserted into the oil groove to be communicated with the rodless cavity, and when one end of the piston rod is inserted into the piston cavity and is in place, a buffer gap is reserved between the pre-flushing oil pipe and the bottom of the oil groove.
In the ring forging hydraulic press, a through hole for accommodating the pre-punching oil pipe to pass through is formed in the plunger rod, and the pre-punching oil pipe and the through hole are sealed through an oil separation guide sleeve.
In the ring forging hydraulic press, a main cavity for accommodating a plunger rod is arranged in the cylinder body, a main cylinder oil inlet communicated with the main cavity is arranged on the cylinder body, and a pre-punching groove is formed in the plunger rod and/or the top wall of the main cavity and is used for being communicated with the main cylinder oil inlet when the plunger rod returns in place in the main cavity so as to enlarge the contact surface between oil in the main cylinder oil inlet and the plunger rod.
In the above-mentioned ring-forging hydraulic press, the pre-punched groove is a first annular groove and/or a first annular groove formed on the circumferential edge of the upper end of the plunger rod; the central line of the plunger rod is provided with a through hole for accommodating the pre-punching oil pipe to pass through, the pre-punching oil pipe and the through hole are sealed through an oil separation guide sleeve, a gap is reserved between the oil separation guide sleeve and the upper end surface of the plunger rod, and the gap forms the pre-punching groove.
In the above-mentioned ring forging hydraulic press, the pre-punched groove is a second annular groove formed on the top wall of the main cavity.
In the above ring forging hydraulic press, a diversion channel communicated with the rodless cavity is formed in the pre-flushing oil pipe, a pre-flushing piston oil inlet is formed on the pre-flushing oil pipe at the upper end of the diversion channel, the pre-flushing piston oil inlet is communicated with the oil tank through a first oil path, the first oil path comprises a first oil outlet pipeline and a first oil inlet pipeline, a second liquid filling valve, a fourth valve and a fifth valve are sequentially arranged on the first oil outlet pipeline, and a seventh valve and a second valve are sequentially arranged on the first oil inlet pipeline;
The cylinder body is provided with a master cylinder oil inlet which is communicated with the oil tank through a second oil path, the second oil path comprises a second oil inlet pipeline and a second oil outlet pipeline, the second oil inlet pipeline is provided with a second valve and a sixth valve, and the second oil outlet pipeline is connected with a first liquid filling valve and a third valve and then is communicated with the oil tank through a fifth valve;
The main cylinder return oil cylinder is provided with a main cylinder return oil port, the main cylinder return oil port is connected with an oil tank through a third oil way, the third oil way comprises a third oil inlet pipeline and a third oil outlet pipeline, the third oil inlet pipeline is provided with a first check valve, a ninth valve and a first valve, the third oil outlet pipeline is communicated with the oil tank through a first overflow valve and a ninth valve, the first check valve is connected with the first overflow valve in parallel, and the first overflow valve is connected with a tenth valve;
The oil tank is characterized in that the return oil port of the piston is connected with the oil tank through a fourth oil way, the fourth oil way comprises a fourth oil inlet pipeline and a fourth oil outlet pipeline, the fourth oil inlet pipeline is connected with the first valve through a second one-way valve and an eighth valve, the fourth oil outlet pipeline is communicated with the oil tank through a second overflow valve and the eighth valve, the second one-way valve is connected with the second overflow valve in parallel, the first valve and the second valve are connected with a first oil pump motor, and the third valve, the fourth valve and a fifth valve are connected with a second oil pump motor.
The control method of the ring forging hydraulic press comprises the following steps:
The upsetting plate quick-descending stage: the tenth valve is powered on, the first overflow valve loses the supporting function, the dead weight of the upsetting plate descends, the cylinder body volume is increased, the first liquid filling valve is passively opened under the vacuum action, the return oil cylinder discharges oil through the ninth valve, at the moment, the piston rod descends along with the plunger rod, the volume of the rodless cavity is also increased, and the second liquid filling valve is passively opened under the vacuum action to absorb oil;
plunger cylinder pressing stage: the tenth valve is powered off, the first overflow valve is restored to support, the second valve and the sixth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the interior of the cylinder body to enable the plunger rod to descend, the return oil cylinder discharges oil through the first overflow valve and the ninth valve, at the moment, the volume of the rodless cavity is still increased, and the second liquid filling valve is still opened by vacuum effect to absorb oil;
A piston rod descending stage: at the moment, the plunger cylinder is stopped, the second valve and the sixth valve are powered off, the second liquid filling valve is closed, the first valve and the seventh valve are powered on, the first oil pump motor drives the oil pump to supply oil to the rodless cavity, the piston rod drives the pre-punch to move downwards, and the oil in the rod cavity is discharged through the second overflow valve;
And a piston rod return stage: the seventh valve is powered off, the first valve and the eighth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the rod cavity through the second one-way valve and the eighth valve, the piston rod is reset and moves upwards, the fourth valve and the fifth valve are powered on, the second oil pump motor drives the oil pump to actively open the second filling valve, and the rodless cavity discharges oil through the second filling valve;
Plunger cylinder return stage: at the moment, the piston rod returns to the proper position, the eighth valve is powered off, the first valve and the ninth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the return oil cylinder through the first one-way valve and the ninth valve, the third valve and the fifth valve are powered on, the second oil pump motor drives the oil pump to actively start the first liquid filling valve, the plunger cylinder discharges oil through the first liquid filling valve, meanwhile, the volume of the rodless cavity is simultaneously reduced during return of the piston rod, at the moment, the fourth valve needs to be powered on, the second liquid filling valve is maintained to be in an opening state, and the rodless cavity discharges oil through the second liquid filling valve simultaneously, so that the piston rod and the plunger rod are at a relative rest position.
The invention has the beneficial effects that:
Including plunger cylinder, piston rod and return cylinder, the plunger cylinder includes cylinder body and one end inserts the plunger rod of establishing in the cylinder body, the one end that the cylinder body was kept away from to the plunger rod is fixed with the upsetting plate, return cylinder's flexible end is connected be used for on the upsetting plate the reset of plunger rod, be formed with the piston chamber in the plunger rod, the upper end of piston rod is inserted and is located in the piston chamber, and will through the piston head the piston chamber is cut apart into rodless cavity and pole chamber, the lower extreme of piston rod runs through the upsetting plate is equipped with the pre-punch head, the cylinder body with the plunger rod is run through by pre-punching oil pipe, pre-punching oil pipe is used for with rodless cavity and external intercommunication, the plunger rod surface is equipped with the intercommunication there is the piston return oil port in pole chamber.
According to the invention, the piston cavity is arranged in the plunger rod of the plunger cylinder, and the piston rod is integrated in the plunger rod, so that the plunger rod is used for replacing the cylinder body of the piston rod, when upsetting a workpiece, the plunger rod is used for downwards moving to upsett the workpiece, after upsetting, the pre-punching oil pipe arranged in the cylinder body is used for supplying oil to the rodless cavity of the piston rod, so that the piston rod is driven to downwards move, and the pre-punching blind hole operation is carried out on the workpiece by the pre-punching head at the lower end of the piston rod, so that the equipment for upsetting the workpiece and pre-punching blind hole operation is integrated, the equipment integration level is high, the volume is smaller, and the workpiece is not required to be transferred into another press for pre-punching blind hole after upsetting the workpiece, thereby reducing the labor intensity.
In the invention, the descending of the piston rod utilizes the rodless cavity to feed oil through the pre-flushing oil pipe, the pre-flushing oil pipe is arranged in the cylinder body, and the oil is discharged through the return oil port of the piston arranged on the piston rod, so that the diameter of a moving pipeline of the piston rod is small, the sealing reliability is higher, and the running stability of equipment is higher.
According to the invention, the piston cylinder is integrated in the plunger rod, the downward movement of the plunger rod and the downward movement of the plunger rod can synchronously act, so that the upsetting plate and the pre-punch can be synchronously driven to descend in a one-time pressing process, and further the processing of two procedures of upsetting and pre-punching blind holes can be synchronously completed, and the processing efficiency of a workpiece is effectively improved.
Further, the upsetting plate comprises a sliding block fixedly connected with the lower end of the plunger rod and an upsetting cutting board arranged on the bottom surface of the sliding block, and the telescopic end of the return cylinder is connected with the sliding block. The setting of slider is convenient for connect the return cylinder, increases the self weight of upsetting plate simultaneously to the upset chopping block descends under self weight fast.
Further, the piston head is fixedly sleeved at a position, close to the upper end, of the piston rod, a piston guide sleeve is arranged between the lower end of the piston head and the inner wall of the piston cavity, and a rod cavity is formed between the piston head and the piston guide sleeve. The piston guide sleeve is convenient for improving the tightness when the piston rod slides in the piston cavity.
Further, an oil groove communicated with the rodless cavity is formed in the upper end of the piston rod, the lower end of the pre-flushing oil pipe is inserted into the oil groove to be communicated with the rodless cavity, and a buffer gap is reserved between the pre-flushing oil pipe and the bottom of the oil groove when one end of the piston rod is inserted into the piston cavity and is in place. The setting of oil groove is convenient for accomodate the oil pipe that dashes in advance, and then whole equipment height has been reduced, avoid solid plunger rod and the offset of pre-flushing hydro-cylinder to set up, make equipment whole height bigger condition, and the setting of oil groove bottom buffering clearance, then in order to increase the contact surface of oil in the pre-flushing oil pipe and oil groove, and then when making external oil pump input oil to the rodless intracavity through pre-flushing oil pipe, oil can flow into the rodless intracavity through buffering clearance fast, and drive the piston rod decline through extrusion piston head, in order to reach the purpose of piston rod under the oil pressure drive of oil pump fast action, simultaneously owing to the setting of buffering clearance, also avoid pre-flushing oil pipe lower extreme oil-outlet to be blocked by the plunger rod, and make the oil pump when driving the piston rod decline, need be through pre-flushing oil pipe top touching oil groove bottom earlier, make oil groove bottom and the oil outlet of pre-flushing oil pipe produce the clearance after, oil can enter into rodless intracavity through the clearance, at this moment oil top is touched the piston rod and is stretched out, need to be filled with the rodless chamber earlier and can extrude the piston head action and make the piston rod descend, this oil fills in the rodless intracavity through the clearance, can stop the setting up the piston rod in the process of piston rod fast action, the problem of stretching out takes place when the piston rod is stretched out, the piston rod takes place in order to stop the short time, the problem of the setting is solved.
According to a further scheme, a through hole for accommodating the pre-flushing oil pipe to pass through is formed in the plunger rod, and the pre-flushing oil pipe and the through hole are sealed through an oil separation guide sleeve. The oil separation guide sleeve is arranged to prevent oil in the plunger cylinder from flowing into the rodless cavity of the piston rod through the through hole.
According to a further scheme, a main cavity for accommodating a plunger rod is arranged in the cylinder body, a main cylinder oil inlet communicated with the main cavity is formed in the cylinder body, and a pre-punching groove is formed in the plunger rod and/or the top wall of the main cavity and used for communicating with the main cylinder oil inlet when the plunger rod returns in place in the main cavity so as to enlarge the contact surface between oil in the main cylinder oil inlet and the plunger rod. Through the contact surface between the pre-punching groove increase fluid and the plunger rod, and then the atress face in the increase plunger rod unit area, the fluid of being convenient for through the output in the master cylinder oil inlet extrudees the plunger rod fast and stretches out in the cylinder body, simultaneously because the setting of pre-punching groove, make the fluid in the master cylinder oil inlet also can remain in the pre-punching groove, the lubrication that the plunger rod stretches out of being convenient for reduces the removal frictional force of plunger rod at the cylinder body.
Further, the pre-punching groove is a first annular groove and/or a first annular groove formed on the circumferential edge of the upper end of the plunger rod; the central line of the plunger rod is provided with a through hole for accommodating the pre-punching oil pipe to pass through, the pre-punching oil pipe and the through hole are sealed through an oil separation guide sleeve, a gap is reserved between the oil separation guide sleeve and the upper end surface of the plunger rod, and the gap forms the pre-punching groove. The arrangement of the first annular groove is beneficial to increasing the contact stress surface of oil and the plunger rod, so that the plunger rod can be conveniently and rapidly stretched out, the first annular groove is arranged at the edge of the upper end of the plunger cylinder, so that the oil and the inner wall of the main cavity of the cylinder body can be conveniently contacted, the contact friction force of the plunger rod in the main cavity can be conveniently reduced, the pre-flushing groove can be formed by a gap between the oil separation sleeve and the upper end of the plunger rod, the effect of increasing the contact stress surface of the plunger rod in unit area with the oil can be achieved, meanwhile, the gap is communicated with the main cylinder oil inlet, so that the oil can lubricate the plunger rod and the pre-flushing oil pipe, when the first annular groove and the gap are synchronously arranged, the friction force of the plunger rod when moving in the cylinder body can be furthest reduced, and the action of the plunger rod can be more conveniently stretched out.
In a further aspect, the pre-flush groove is a second annular groove formed on the top wall of the main cavity. The pre-punching groove is arranged in the cylinder body, so that the contact stress surface between the plunger rod and oil in unit area can be increased.
According to a further scheme, a diversion channel communicated with the rodless cavity is formed in the pre-flushing oil pipe, a pre-flushing piston oil inlet is formed in the upper end of the diversion channel and located on the pre-flushing oil pipe, the pre-flushing piston oil inlet is communicated with an oil tank through a first oil way, the first oil way comprises a first oil outlet pipeline and a first oil inlet pipeline, a second filling valve, a fourth valve and a fifth valve are sequentially arranged on the first oil outlet pipeline, and a seventh valve and a second valve are sequentially arranged on the first oil inlet pipeline;
The cylinder body is provided with a master cylinder oil inlet which is communicated with the oil tank through a second oil path, the second oil path comprises a second oil inlet pipeline and a second oil outlet pipeline, the second oil inlet pipeline is provided with a second valve and a sixth valve, and the second oil outlet pipeline is connected with a first liquid filling valve and a third valve and then is communicated with the oil tank through a fifth valve;
The main cylinder return oil cylinder is provided with a main cylinder return oil port, the main cylinder return oil port is connected with an oil tank through a third oil way, the third oil way comprises a third oil inlet pipeline and a third oil outlet pipeline, the third oil inlet pipeline is provided with a first check valve, a ninth valve and a first valve, the third oil outlet pipeline is communicated with the oil tank through a first overflow valve and a ninth valve, the first check valve is connected with the first overflow valve in parallel, and the first overflow valve is connected with a tenth valve;
The oil tank is characterized in that the return oil port of the piston is connected with the oil tank through a fourth oil way, the fourth oil way comprises a fourth oil inlet pipeline and a fourth oil outlet pipeline, the fourth oil inlet pipeline is connected with the first valve through a second one-way valve and an eighth valve, the fourth oil outlet pipeline is communicated with the oil tank through a second overflow valve and the eighth valve, the second one-way valve is connected with the second overflow valve in parallel, the first valve and the second valve are connected with a first oil pump motor, and the third valve, the fourth valve and a fifth valve are connected with a second oil pump motor.
The control method of the ring forging hydraulic press comprises the following steps:
The upsetting plate quick-descending stage: the tenth valve is powered on, the first overflow valve loses the supporting function, the dead weight of the upsetting plate descends, the cylinder body volume is increased, the first liquid filling valve is passively opened under the vacuum action, the return oil cylinder discharges oil through the ninth valve, at the moment, the piston rod descends along with the plunger rod, the volume of the rodless cavity is also increased, and the second liquid filling valve is passively opened under the vacuum action to absorb oil;
plunger cylinder pressing stage: the tenth valve is powered off, the first overflow valve is restored to support, the second valve and the sixth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the interior of the cylinder body to enable the plunger rod to descend, the return oil cylinder discharges oil through the first overflow valve and the ninth valve, at the moment, the volume of the rodless cavity is still increased, and the second liquid filling valve is still opened by vacuum effect to absorb oil;
A piston rod descending stage: at the moment, the plunger cylinder is stopped, the second valve and the sixth valve are powered off, the second liquid filling valve is closed, the first valve and the seventh valve are powered on, the first oil pump motor drives the oil pump to supply oil to the rodless cavity, the piston rod drives the pre-punch to move downwards, and the oil in the rod cavity is discharged through the second overflow valve;
And a piston rod return stage: the seventh valve is powered off, the first valve and the eighth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the rod cavity through the second one-way valve and the eighth valve, the piston rod is reset and moves upwards, the fourth valve and the fifth valve are powered on, the second oil pump motor drives the oil pump to actively open the second filling valve, and the rodless cavity discharges oil through the second filling valve;
Plunger cylinder return stage: at the moment, the piston rod returns to the proper position, the eighth valve is powered off, the first valve and the ninth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the return oil cylinder through the first one-way valve and the ninth valve, the third valve and the fifth valve are powered on, the second oil pump motor drives the oil pump to actively start the first liquid filling valve, the plunger cylinder discharges oil through the first liquid filling valve, meanwhile, the volume of the rodless cavity is simultaneously reduced during return of the piston rod, at the moment, the fourth valve needs to be powered on, the second liquid filling valve is maintained to be in an opening state, and the rodless cavity discharges oil through the second liquid filling valve simultaneously, so that the piston rod and the plunger rod are at a relative rest position. In this stage, the piston rod and the plunger rod return synchronously, so that the piston rod and the plunger rod are relatively stationary, the return time of the equipment is greatly shortened, and the efficient operation of the equipment is facilitated.
These features and advantages of the present invention will be disclosed in detail in the following detailed description and the accompanying drawings.
[ Description of the drawings ]
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a cross-sectional view of a ring forging hydraulic press according to an embodiment of the present invention;
fig. 2 is a structural cross-sectional view of a ring forging hydraulic press according to an embodiment of the present invention.
Reference numerals:
100 cylinder bodies, 110 master cylinder oil inlets, 120 pre-punching grooves and 121 gaps;
200 plunger rods, 201 piston return oil ports, 210 piston cavities, 211 rodless cavities, 212 rod cavities, 220 piston heads, 230 piston guide sleeves, 240 upsetting plates, 241 sliding blocks and 242 upsetting chopping blocks;
300 pre-flushing oil pipes, 310 pre-flushing piston oil inlets;
400 piston rods, 410 pre-punch heads, 420 oil grooves and 421 buffer gaps;
500 oil-separating guide sleeve;
600 return cylinders, 601 return cylinders, 602 return plunger rods and 610 main cylinder return oil ports;
Y1 first, Y2 second, third, fourth, fifth, second, seventh, ninth, and tenth valves Y3, Y4, Y5, Y7, Y8, Y9, Y10;
The hydraulic pump comprises a first overflow valve 2, a second overflow valve 3, a first check valve 4, a second check valve 5, a first oil pump motor 6, a second oil pump motor 7, a first charge valve cf1 and a second charge valve cf 2.
[ Detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Referring to fig. 1, the hydraulic ring forging press provided by the embodiment of the invention comprises a plunger cylinder, a piston rod 400 and a return cylinder 600, wherein the plunger cylinder comprises a cylinder body 100, a main cavity is arranged in the cylinder body 100, the upper end of the plunger rod 200 is inserted into the main cavity, the lower end of the plunger rod 200 is fixedly connected with a slide block 241, an upsetting anvil 242 is arranged in the center of the bottom surface of the slide block 241, a main cylinder oil inlet 110 communicated with the main cavity is arranged at the upper end of the cylinder body 100, oil flows into the main cavity through the main cavity oil inlet to push the plunger rod 200 to extend out of the cylinder body 100, meanwhile, the plunger rod 200 drives the slide block 241 and the upsetting anvil 242 to descend when descending to upsett a workpiece, two return cylinders 600 are arranged at two sides of the upsetting anvil 242, the return cylinder 600 is a plunger cylinder, the return cylinder 600 comprises a return cylinder 601 and a return plunger rod 602 inserted at the upper end of the return cylinder body 601, and the upper end of the return cylinder 602 is connected with the slide block 241, the lower end of the return cylinder body 601 is provided with a main cylinder return oil port 610 for connecting with an external oil pump, the return oil cylinder 600 is used for propping against the sliding block 241 to move upwards so as to reset the plunger rod 200 of the plunger cylinder, a piston cavity 210 is formed between the lower end of the interior of the plunger rod 200 and the sliding block 241, the upper end of the piston rod 400 is correspondingly inserted in the piston cavity 210, a piston head 220 is fixedly sleeved at the upper end of the piston rod 400, the piston head 220 divides the piston cavity 210 into an upper space and a lower space, a rodless cavity 211 is arranged at the upper end, a rod cavity 212 is arranged at the lower end, the lower end of the plunger rod 200 is provided with a pre-punch 410 penetrating through the sliding block 241 and the upsetting anvil 242, the upper end of the piston rod 400 is provided with an oil groove 420, a pre-punch oil pipe 300 penetrates through the oil groove 420, the upper end of the pre-punch oil cylinder sequentially penetrates through the plunger rod 200 and the cylinder body 100 to form a pre-punch piston oil inlet 310 on the surface of the cylinder body 100, the oil can flow into the diversion channel in the pre-flushing oil pipe 300 through the pre-flushing piston oil inlet 310, then enters the rodless cavity 211 through the oil groove 420, and drives the piston rod 400 to descend through the extrusion piston head 220, and the piston return oil port 201 communicated with the rod cavity 212 is arranged on the surface of the corresponding piston rod 200, when the piston rod 400 descends, the volume of the rodless cavity 211 becomes larger, the volume of the rod cavity 212 becomes smaller, and oil is discharged through the piston return oil port 201.
In this embodiment, through holes are formed in both the slider 241 and the upsetting block 242, so that the pre-punch 410 is driven by the piston rod 400 to extend from the bottom surface of the upsetting block 242, thereby pre-punching blind holes in the blank.
In this embodiment, the lower end of the piston rod 200 and the inner wall of the main cavity are sealed by the main cylinder guide sleeve, the lower end of the piston head 220 is located on the inner wall of the piston rod 400 and the piston cavity 210, the piston guide sleeve 230 is used for sealing the piston cavity 210, and a rod cavity 212 is formed between the piston guide sleeve 230 and the piston head 220.
In this embodiment, referring to fig. 1, the arrangement of the oil groove 420 facilitates the storage of the pre-flushing oil pipe 300, so as to reduce the overall height of the device, avoid the situation that the overall height of the device is larger when the solid plunger rod 200 is propped against the pre-flushing oil cylinder, and keep a buffer gap 421 between the pre-flushing oil pipe 300 and the bottom of the oil groove 420 when one end of the piston rod 400 is inserted into the piston cavity 210 and is in place, and increase the contact surface between the oil in the pre-flushing oil pipe 300 and the oil groove 420 due to the arrangement of the buffer gap 421, so that when the external oil pump inputs the oil into the rodless cavity 211 through the pre-flushing oil pipe 300, the oil can quickly flow into the rodless cavity 211 through the buffer gap 421, and drive the piston rod 400 to descend through the extrusion piston head 220, so as to achieve the purpose that the piston rod 400 is quickly operated under the oil pressure driving of the oil pump.
Meanwhile, due to the arrangement of the buffer gap 421, the situation that the oil outlet at the lower end of the pre-flushing oil pipe 300 is blocked by the plunger rod 200, when the oil pump drives the piston rod 400 to descend, the bottom of the oil groove 420 is propped against the oil outlet at the lower end of the pre-flushing oil pipe 300 through the pre-flushing oil pipe 300, after the gap is formed between the bottom of the oil groove 420 and the oil outlet at the lower end of the pre-flushing oil pipe 300, oil can enter the rodless cavity 211 through the gap, at the moment, the oil is propped against the piston rod 400 to stretch out, the piston rod 400 can be descended through the action that the piston head 220 is extruded through the gap and then the rodless cavity 211 is filled with oil, the situation that the stretching action of the piston rod 400 stops temporarily is caused in the process that the gap is filled with oil, and the rapid stretching of the piston rod 400 is influenced, and therefore the problem that the piston rod 400 is stopped when the stretching action is solved through the arrangement of the buffer gap 421.
In this embodiment, referring to fig. 2, in order to facilitate the external oil pump to input oil into the cylinder body 100 through the master cylinder oil inlet 110 so as to enable the plunger rod 200 to rapidly extend out of the cylinder body 100, a pre-punching groove 120 is provided on the plunger rod 200, and when the pre-punching groove 120 is used for returning the plunger rod 200 in place, the pre-punching groove 120 is communicated with the master cylinder oil inlet 110, so that the oil can be filled in the pre-punching groove 120, and when the oil pump supplies oil to the main cavity through the master cylinder oil inlet 110, the pressure contact surface of the oil to the plunger cylinder is increased by using the pre-punching groove 120, so that the plunger rod 200 is conveniently and rapidly pushed to extend under the action of oil pressure.
Specifically, referring to fig. 2 (the hollow 121 in fig. 2 is not communicated with the master cylinder oil inlet 110, but only the first annular groove is communicated with the master cylinder oil inlet 110), the pre-flushing groove 120 is a first annular groove formed in the circumferential edge of the upper end of the plunger rod 200, so that the contact stress surface of the plunger rod 200 and oil can be increased, the plunger rod 200 can be conveniently and rapidly stretched out, and meanwhile, the first annular groove is formed in the edge of the upper end of the plunger rod 200, so that the oil can be in contact with the inner wall of the main cavity of the cylinder 100, and further the contact friction force of the plunger rod 200 in the main cavity is reduced.
In this embodiment, through holes are provided at the penetrating positions of the plunger rod 200 and the cylinder body 100 corresponding to the pre-flushing oil pipe 300, and the space between the plunger rod 200 and the through holes is sealed by the oil-separating guide sleeve 500, so as to prevent the oil in the plunger cylinder from flowing into the rodless cavity 211 of the piston rod 400 through the through holes.
Based on the above embodiment, in this embodiment, the pre-flushing groove 120 may also be formed by leaving a gap 121 between the oil separation guide sleeve 500 and the upper end surface of the plunger rod 200, where the gap 121 is communicated with the master cylinder oil inlet 110, and oil is distributed on the oil separation guide sleeve 500, so as to increase the contact force surface of the plunger rod 200 with the oil in a unit area, so that the high pressure output by the oil pump can push the plunger rod 400 to extend quickly, and meanwhile, due to the existence of the gap 121, the oil lubricates the plunger rod 200 and the pre-flushing oil pipe 300, so that the friction force between the plunger rod 200 and the pre-flushing oil pipe 300 is further reduced when the plunger rod 200 extends from the cylinder 100, and the friction force when the plunger rod 200 moves in the cylinder 100 is reduced when the plunger rod 200 extends.
In the above embodiment, when the gap 121 and the first annular groove are synchronously arranged, the pressure surface of the oil acting on the upper end of the plunger rod 200 is effectively increased, so that the plunger rod 200 can be rapidly extended, and meanwhile, the abrasion of the plunger cylinder is reduced to the greatest extent, and the plunger cylinder is effectively protected.
In this embodiment, the pre-punching groove 120 is an annular groove, which is favorable for regularly distributing oil at the upper end of the plunger cylinder, so that the pressures at each part of the upper end of the plunger rod 200 are uniformly distributed in an annular shape, and when the oil pump presses the plunger cylinder through the main cylinder oil inlet 110 to push the plunger cylinder to extend out of the cylinder body 100, the cylinder body 100 is kept to stably extend axially by utilizing the annular groove, so that the problem that radial offset force is generated when the plunger cylinder extends out to affect the stable extension of the plunger rod 200 due to uneven distribution of the pre-punching groove 120 on the plunger cylinder is avoided.
Based on the above embodiment, the pre-punching groove 120 may be a second annular groove provided in the top wall of the master cylinder, which may be used simultaneously with the first annular groove, or may be used instead of the first annular groove to achieve the above effect.
In this embodiment, referring to fig. 1, the pre-flushing piston oil inlet 310 is communicated with the oil tank through a first oil path, the first oil path includes a first oil outlet pipeline and a first oil inlet pipeline, the first oil outlet pipeline is sequentially provided with a second filling valve CF2, a fourth valve Y4 and a fifth valve Y5, and the first oil inlet pipeline is sequentially provided with a seventh valve Y7 and a second valve Y2.
The master cylinder oil inlet 110 is communicated with the oil tank through a second oil path, the second oil path comprises a second oil inlet pipeline and a second oil outlet pipeline, the second oil inlet pipeline is provided with a second valve Y2 and a sixth valve Y6, the second oil outlet pipeline is connected with a first filling valve CF1 and a third valve Y3 and then communicated with the oil tank through a fifth valve Y5, the master cylinder return oil port 610 is connected with the oil tank through a third oil path, the third oil path comprises a third oil inlet pipeline and a third oil outlet pipeline, the third oil inlet pipeline is provided with a first check valve 4, a ninth valve Y9 and a first valve Y1, the third oil outlet pipeline is communicated with the oil tank through a first overflow valve 2 and a ninth valve Y9, the first check valve 4 is connected with the first overflow valve 2 in parallel, and the first overflow valve 2 is connected with a tenth valve Y10.
The piston return oil port 201 is connected with an oil tank through a fourth oil way, the fourth oil way comprises a fourth oil inlet pipeline and a fourth oil outlet pipeline, the fourth oil inlet pipeline is connected with the first valve Y1 through a second one-way valve 5 and an eighth valve Y8, the fourth oil outlet pipeline is communicated with the oil tank through a second overflow valve 3 and an eighth valve Y8, the second one-way valve 5 is connected with the second overflow valve 3 in parallel, the first valve Y1 and the second valve Y2 are connected with the first oil pump motor 6, and the third valve Y3, the fourth valve Y4 and the fifth valve Y5 are connected with the second oil pump motor 7.
Specifically, the workpiece blank may be placed at the lower end of the upsetting anvil 242, and then sequentially subjected to the following processing stages:
The upsetting plate 240 rapid-descending stage: the tenth valve Y10 is powered on, the first overflow valve 2 loses the supporting function, the upsetting plate 240 moves down by its own weight, the volume of the main chamber in the cylinder body 100 increases, the first filling valve CF1 is opened passively by the vacuum action, the return cylinder 600 discharges oil through the ninth valve Y9, at this time, the piston rod 400 moves down along with the plunger rod 200, the volume of the rodless chamber 211 also increases, and the second filling valve CF2 opens passively by the vacuum action to suck oil.
Plunger cylinder pressing stage: the tenth valve Y10 is powered off, the first overflow valve 2 is restored to support, the second valve Y2 and the sixth valve Y6 are powered on, the first oil pump motor 6 drives the oil pump to supply oil to the cylinder body 100, the plunger rod 200 descends to drive the slide block 241 and the upsetting anvil 242 to punch and shape blanks, the return oil cylinder 600 discharges oil through the first overflow valve 2 and the ninth valve Y9, at the moment, the volume of the rodless cavity 211 is still increased, and the second filling valve CF2 is still opened passively by vacuum action to suck oil.
The piston rod 400 descending stage: at this time, the plunger cylinder is stopped, the second valve Y2 and the sixth valve Y6 are powered off, the second charging valve CF2 is closed, the first valve Y1 and the seventh valve Y7 are powered on, the first oil pump motor 6 drives the oil pump to supply oil to the rodless cavity 211, the piston rod 400 drives the pre-punch to move downwards and pre-punch the blind hole on the workpiece, and the rod cavity 212 discharges oil through the second overflow valve 3.
The return stage of the piston rod 400: the seventh valve Y7 is powered off, the first valve Y1 and the eighth valve Y8 are powered on, the first oil pump motor 6 drives the oil pump to supply oil to the rod cavity 212 through the second one-way valve 5 and the eighth valve Y8, the piston rod 400 is reset and moves upwards, the fourth valve Y4 and the fifth valve Y5 are powered on, the second oil pump motor 7 drives the oil pump to actively open the second filling valve CF2, and the rodless cavity 211 discharges oil through the second filling valve CF 2.
Plunger cylinder return stage: at this time, the piston rod 400 returns to the position, the eighth valve Y8 is de-energized, the first valve Y1 and the ninth valve Y9 are energized, the first oil pump motor 6 drives the oil pump to supply oil to the return oil cylinder 600 through the first check valve 4 and the ninth valve Y9, the third valve Y3 and the fifth valve Y5 are energized, the second oil pump motor 7 drives the oil pump to actively open the first filling valve CF1, the plunger cylinder discharges oil through the first filling valve CF1, meanwhile, the volume of the rodless cavity 211 is reduced during return of the plunger rod 200, at this time, the fourth valve Y4 needs to be energized, the second filling valve CF2 is maintained in an opened state, the rodless cavity 211 discharges oil through the second filling valve CF2 at the same time, so that the piston rod 400 and the plunger rod 200 are synchronously returned in this stage, and the two are relatively stationary, thus greatly reducing the return time of the device, and facilitating the efficient operation of the device.
The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that the present invention includes but is not limited to the accompanying drawings and the description of the above specific embodiment. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (8)
1. The control method of the ring-rolling hydraulic press is characterized by comprising a plunger cylinder, a piston rod and a return cylinder, wherein the plunger cylinder comprises a cylinder body and a plunger rod with one end inserted in the cylinder body, a upsetting plate is fixed at one end of the plunger rod, far away from the cylinder body, a telescopic end of the return cylinder is connected to the upsetting plate for resetting the plunger rod, a piston cavity is formed in the plunger rod, the upper end of the piston rod is inserted in the piston cavity and divides the piston cavity into a rodless cavity and a rod cavity through a piston head, a pre-punching head penetrates through the upsetting plate at the lower end of the piston rod, the cylinder body and the plunger rod are penetrated by a pre-punching oil pipe, the pre-punching oil pipe is used for communicating the rodless cavity with the outside, a piston return oil port communicated with the rod cavity is formed on the surface of the plunger rod,
A diversion channel communicated with the rodless cavity is formed in the pre-flushing oil pipe, a pre-flushing piston oil inlet is formed in the pre-flushing oil pipe at the upper end of the diversion channel, the pre-flushing piston oil inlet is communicated with the oil tank through a first oil way, the first oil way comprises a first oil outlet pipeline and a first oil inlet pipeline, a second filling valve, a fourth valve and a fifth valve are sequentially arranged on the first oil outlet pipeline, and a seventh valve and a second valve are sequentially arranged on the first oil inlet pipeline;
The cylinder body is provided with a master cylinder oil inlet which is communicated with the oil tank through a second oil path, the second oil path comprises a second oil inlet pipeline and a second oil outlet pipeline, the second oil inlet pipeline is provided with a second valve and a sixth valve, and the second oil outlet pipeline is connected with a first liquid filling valve and a third valve and then is communicated with the oil tank through a fifth valve;
The main cylinder return oil cylinder is provided with a main cylinder return oil port, the main cylinder return oil port is connected with an oil tank through a third oil way, the third oil way comprises a third oil inlet pipeline and a third oil outlet pipeline, the third oil inlet pipeline is provided with a first check valve, a ninth valve and a first valve, the third oil outlet pipeline is communicated with the oil tank through a first overflow valve and a ninth valve, the first check valve is connected with the first overflow valve in parallel, and the first overflow valve is connected with a tenth valve;
The return oil port of the piston is connected with the oil tank through a fourth oil way, the fourth oil way comprises a fourth oil inlet pipeline and a fourth oil outlet pipeline, the fourth oil inlet pipeline is connected with the first valve through a second one-way valve and an eighth valve, the fourth oil outlet pipeline is communicated with the oil tank through a second overflow valve and the eighth valve, the second one-way valve is connected with the second overflow valve in parallel, the first valve and the second valve are connected with a first oil pump motor, the third valve, the fourth valve and a fifth valve are connected with a second oil pump motor,
The control method of the ring forging hydraulic press comprises the following steps:
The upsetting plate quick-descending stage: the tenth valve is powered on, the first overflow valve loses the supporting function, the dead weight of the upsetting plate descends, the cylinder body volume is increased, the first liquid filling valve is passively opened under the vacuum action, the return oil cylinder discharges oil through the ninth valve, at the moment, the piston rod descends along with the plunger rod, the volume of the rodless cavity is also increased, and the second liquid filling valve is passively opened under the vacuum action to absorb oil;
plunger cylinder pressing stage: the tenth valve is powered off, the first overflow valve is restored to support, the second valve and the sixth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the interior of the cylinder body to enable the plunger rod to descend, the return oil cylinder discharges oil through the first overflow valve and the ninth valve, at the moment, the volume of the rodless cavity is still increased, and the second liquid filling valve is still opened by vacuum effect to absorb oil;
A piston rod descending stage: at the moment, the plunger cylinder is stopped, the second valve and the sixth valve are powered off, the second liquid filling valve is closed, the first valve and the seventh valve are powered on, the first oil pump motor drives the oil pump to supply oil to the rodless cavity, the piston rod drives the pre-punch to move downwards, and the oil in the rod cavity is discharged through the second overflow valve;
And a piston rod return stage: the seventh valve is powered off, the first valve and the eighth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the rod cavity through the second one-way valve and the eighth valve, the piston rod is reset and moves upwards, the fourth valve and the fifth valve are powered on, the second oil pump motor drives the oil pump to actively open the second filling valve, and the rodless cavity discharges oil through the second filling valve;
Plunger cylinder return stage: at the moment, the piston rod returns to the proper position, the eighth valve is powered off, the first valve and the ninth valve are powered on, the first oil pump motor drives the oil pump to supply oil to the return oil cylinder through the first one-way valve and the ninth valve, the third valve and the fifth valve are powered on, the second oil pump motor drives the oil pump to actively start the first liquid filling valve, the plunger cylinder discharges oil through the first liquid filling valve, meanwhile, the volume of the rodless cavity is simultaneously reduced during return of the piston rod, at the moment, the fourth valve needs to be powered on, the second liquid filling valve is maintained to be in an opening state, and the rodless cavity discharges oil through the second liquid filling valve simultaneously, so that the piston rod and the plunger rod are at a relative rest position.
2. The control method of a ring forging hydraulic press as recited in claim 1, wherein said upsetting plate comprises a slider fixedly connected with a lower end of said plunger rod and an upsetting block provided on a bottom surface of said slider, and a telescopic end of said return cylinder is connected with said slider.
3. The method of claim 1, wherein the piston head is fixedly sleeved on the piston rod near the upper end, a piston guide sleeve is arranged between the piston rod and the inner wall of the piston cavity at the lower end of the piston head, and the rod cavity is formed between the piston head and the piston guide sleeve.
4. The method of claim 1, wherein the upper end of the piston rod is provided with an oil groove communicated with the rodless cavity, the lower end of the pre-flushing oil pipe is inserted into the oil groove to be communicated with the rodless cavity, and a buffer gap is reserved between the pre-flushing oil pipe and the bottom of the oil groove when one end of the piston rod is inserted into the piston cavity and is in place.
5. The method of claim 1, wherein a through hole is provided in the plunger rod for receiving the pre-punched oil pipe therethrough, and the pre-punched oil pipe and the through hole are sealed by an oil-separating guide sleeve.
6. The method for controlling a ring forging hydraulic press as recited in claim 1, wherein a main cavity for accommodating a plunger rod is provided in the cylinder, a main cylinder oil inlet communicating with the main cavity is provided in the cylinder, and a pre-punching groove is formed in a top wall of the plunger rod and/or the main cavity, and the pre-punching groove is used for communicating with the main cylinder oil inlet when the plunger rod returns in place in the main cavity so as to enlarge a contact surface between oil in the main cylinder oil inlet and the plunger rod.
7. The method of controlling a hydraulic ring forging press as recited in claim 6, wherein said pre-punched groove is a first annular groove and/or a first annular groove formed at a peripheral edge of an upper end of said plunger rod; the central line of the plunger rod is provided with a through hole for accommodating the pre-punching oil pipe to pass through, the pre-punching oil pipe and the through hole are sealed through an oil separation guide sleeve, a gap is reserved between the oil separation guide sleeve and the upper end surface of the plunger rod, and the gap forms the pre-punching groove.
8. The method of controlling a ring forging hydraulic press as recited in claim 6, wherein said pre-punched groove is a second annular groove formed in a top wall of said main cavity.
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| KR20120047660A (en) * | 2010-11-04 | 2012-05-14 | 한국과학기술원 | Independently controlled multi-stage hydrolic cylinder and mooring system using the cylinder |
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