CN102189698A - Press machine with pretightening frame - Google Patents
Press machine with pretightening frame Download PDFInfo
- Publication number
- CN102189698A CN102189698A CN2011100660582A CN201110066058A CN102189698A CN 102189698 A CN102189698 A CN 102189698A CN 2011100660582 A CN2011100660582 A CN 2011100660582A CN 201110066058 A CN201110066058 A CN 201110066058A CN 102189698 A CN102189698 A CN 102189698A
- Authority
- CN
- China
- Prior art keywords
- piston cylinder
- press
- hydraulic press
- frame
- cylinder unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
- B30B1/34—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure involving a plurality of plungers acting on the platen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
- B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members
Abstract
The present invention discloses a hydraulic press machine with a frame. An extension pad is supported on the frame for supporting a movable press machine beam which cooperates with the extension pad. The pressure machine frame can be operated through a hydraulic main driving device. The main driving device is provided with at least two (preferably two) piston cylinder units which are supported on the frame. The press machine beam is clamped among the piston cylinder units through a force which is generated by a pretightening force in a piston cylinder unit. Through the measure, in operating with a workpiece in a processing period and outside the processing period, a basically same force can be continuously applied for the workpiece.
Description
Technical field
The present invention relates to a kind of hydraulic press as described in the preamble according to claim 1, it has at least one and is supported on main drive on the frame, is used for operating pressure machine beam or compacting head.
Background technology
Hydraulic press particularly is used for connection, distortion and the cutting processing of preferable alloy workpiece when a large amount of production.Wherein, modern hydraulic press is with the pressure work of hundreds of bar, so that also can process workpiece big and/or heavy wall.
Usually hydraulic press has the compacting head, and it can be bearing on the frame with moving both vertically, and can operate by piston-cylinder apparatus.Described piston-cylinder apparatus or can directly provide pressure medium by hydraulic pump, perhaps the accumulator that connects by the centre indirectly provides pressure medium, and wherein, the latter's advantage is that hydraulic pump only must design according to the average power requirement of forcing press.In addition, the design of frame or support can be adopted different materials.Originally frame is mostly by casting pig or cast steel manufacturing.Yet not long ago increasing forcing press adopts welded-steel plate construction.
Casting pig is except having high vibration damping and good casting characteristics, and it also has the E modulus low, several big shortcoming that wearability is low.Opposite with it, steel casting has obviously high E modulus.Yet the processing of steel casting is more much higher than the expense of the processing of casting pig, and is therefore also uneconomical.Yet have the highest E modulus by the Welding Structure that steel plate constitutes, and therefore have the highest rigidity.Yet this Welding Structure only has little damping characteristic again, and needs reinforcement mostly, so that obtain maximum rigidity.In addition, steelframe owing to used steel the unfavorable characteristic of vibration damping sufficiently.
Frame will stand very big alternate load when the hydraulic press of modern structure form moves.This alternate load produces the press power that forms from the cycle.Described press power is delivered to the pull and stretch pad by the piston cylinder unit through the compacting head, yet is incorporated into frame.Consequently frame periodically loads press power, and unloading when the compacting head retracts.Particularly in the frame Welding Structure that is made of steel plate, this lasting alternate load causes occurring prematurely fatigue of materials, because frame will stand frequent amoeboid movement in reversible scope.This in order to reduce (inner) motion, described frame be reinforcement or adopt other modes to reinforce in a large number, however the whole weight of forcing press in such event, and desired Master Cost obviously increases.
Summary of the invention
Therefore task of the present invention provides a kind of like this hydraulic press, and this hydraulic press particularly has lower fatigue of materials trend in the scope of frame.
Described task is accomplished by the hydraulic press with claim 1 feature.Favourable improvement projects more of the present invention are themes of dependent claims.
Basic design of the present invention is, is not to address the above problem (taking stopgap measures) by some measures that relate to frame, the problems referred to above (effecting a permanent cure) do not occur but allow to the load type of frame by influence correspondingly.Therefore the present invention's regulation designs a kind of hydraulic press with frame, and workpiece support (preferred pull and stretch pad or foundry goods half module) is supported on the described frame, and forcing press beam coefficient with it is bearing on this frame movably.Described frame can be by the operation of hydraulic pressure main drive.Described main drive has at least two (preferably four) and is supported on frame (interactional) piston cylinder unit (preferably having a cylinder chamber respectively).By the forcing press beam being clamped between the described piston cylinder unit by the formed power of preload pressure in the piston cylinder unit.By this measure, no matter be when being in elaboration with workpiece, when still being in outside the elaboration, can both load essentially identical (pretension) power to frame constantly.The benefit of doing like this is that the machinery of having eliminated frame adds stress and destressing (alternate load).Therefore so just reduced the fatigue of materials in the frame, and need not be for adding stress and destressing process consumed energy in the frame.In addition, ground lingeringly (lags behind in the compacting campaign of forcing press beam and the less press power that retracts between the motion) and forms press power in the least.
Preferably the preload pressure in the piston cylinder unit that pressing direction works is equal to, or greater than adjusting or adjustable maximum press power of main drive at least, and described press power is applied in the workpiece process that is used to stipulate.The benefit of doing like this is, as long as by cancel reaction force on the piston cylinder unit that oppositely pressing direction works, just can form the press power of effect that workpiece is applied.The result who does like this is again only to decompress and to compress little volume (volume of the cylinder chamber in the piston cylinder unit that reverse pressing direction works) periodically.
When not operating main drive, in the position that does not act on workpiece of forcing press beam, preload pressure is identical in two piston cylinder unit, also is favourable.Like this with regard to the hydraulic circuit of the described piston cylinder of simplified operation unit.Preferably in this special situation, described interactional piston cylinder unit is by the hydraulic circuit short circuit.In addition, be connected in the described hydraulic circuit in the middle of the hydraulic press that preferably can oppositely carry, so that the back and forth movement of forcing press beam becomes possibility.
Another instead or additionally can be set for this reason regulate drive unit.Described adjusting drive unit is connected with the forcing press beam effect abreast with main drive, is used for the quick adjustment motion.Like this, when the unable operation of forcing press beam, capable of carrying out quick action.
Under the forcing press beam is in situation outside the workpiece active position, when main drive is not operated, regulates drive unit and apply confining force for the forcing press beam, described forcing press beam is remained in the described position, be favourable.So will not be adjusted between at least two piston cylinder unit in definite preload pressure ratio by main drive, but can realize the balance of pressure in described unit, this point can be accomplished simply.
Description of drawings
Below by preferred embodiment, and with reference to the accompanying drawings the present invention is described in more details.
Described accompanying drawing is:
Fig. 1: according to the principle assumption diagram of the hydraulic press with hydraulic control circuit of preferred embodiment of the present invention.
Fig. 2: according to the principle assumption diagram of the hydraulic press of the alternative adjusting drive unit of having of Fig. 1.
The Reference numeral table
1 frame/bed
2 pedestal sections
4 pull and stretch pads
6 columns
8 plates/supporting arm
10 forcing press beams
12 compacting head/cutting head/staking punch
14 lower piston cylinder units
16,24 cylinders
18,26 pistons
20, cylinder chambers 28
22 upper piston cylinder units
30 main drives
32 screw rods
34 thread bush
35 regulate drive unit
36 electrical servo drive units
38 hydraulic circuits
40 first connecting lines
42 hydraulic presses
44 relief valve devices
46 seat valves
48 seat valves
50 bypass lines
52 by-passing valves
54 other connecting lines
56 accumulators
58 servo drives
60 pretension modules
62 magnetic valves
64 storage tank pipelines
66 working media storage tanks
68 excess pressure valves
70 spools
72 pressure medium pump
74 motors
76 take out pipe
78 check-valves
80 guiding valves
82 excess pressure valves
84 control device
86 stroke sensors
88 electric hydaulic servo drives
90 regulate cylinder
92 pressure medium pump
94 adjustable motors.
The specific embodiment
Fig. 1 shows the hydraulic press according to preferred embodiment of the present invention, and it comprises theory structure machinery and hydraulic pressure.Therefore, described hydraulic press has the frame 1 that is preferably double C shape.Described frame has pedestal section 2.Be formed with containing seat in the centre on described pedestal section, be used for workpiece support, for example the pull and stretch pad 4.Two distolateral vertically extending columns of facing (perhaps wall) 6 that are formed with in pedestal section 2.Free end is formed with supporting arm or the plate 8 that extends in opposite directions on it.
Forcing press beam 10 vertically is bearing on the column 6 movably between upper support arm 8 and bottom base section 2.The containing seat that is used to suppress head or cutting head 12 in its interlude setting or be formed with.Both sides at compacting 12 and pull and stretch pad 4 are provided with a lower piston cylinder unit 14 respectively.Wherein, each piston cylinder unit 14 is made of the cylinder 16 on the pedestal section 2 that is supported on pressure frame 1, extend in the described cylinder 16 at the situation lower piston 18 that forms cylinder chamber 20.Wherein, each piston 18 is fixed on the bottom surface of forcing press beam 10 in the both sides of compacting 12.On upper support arm 8, also be respectively arranged with a piston cylinder unit 22, wherein, a cylinder 24 be installed on each supporting arm 8.Extend in the described cylinder 24 at the situation lower piston 26 that forms piston chamber 28 respectively.Wherein, the piston 26 of upper piston cylinder unit 22 is installed on the end face of forcing press beam 10 on the axially-extending line of lower piston cylinder unit 14.Lower and upper piston cylinder unit 14,22 forms the main drive 30 according to the hydraulic press of the first embodiment of the present invention together.
In addition, also rotatably mounted screw rod 32 on each supporting arm 8, it is engaged in the thread bush 34 that is shaped in forcing press beam 10 or insert.Therefore, can apply pulling force and/or pressure in vertical direction forcing press beam 10 by rotating two screw rods 32.At this, each electrical servo drive unit (motor) 36 is as the drive unit of two screw rods 32.The output shaft of described servo drive is connected with corresponding screw rod 32 un-rotatably.Wherein, according to Fig. 1, the rotary speed of electrical servo drive unit 36 and direction of rotation are transformable.Screw rod 32 and motor 36 form adjusting drive unit 35 and are used for quick acting.
In Fig. 1, illustrate to principle-operate main drive 30 according to hydraulic press of the present invention, just upper and lower piston cylinder unit 22 by hydraulic circuit 38-described hydraulic circuit.Therefore, hydraulic circuit 38 has formed the short circuit circuit basically, and described short circuit circuit couples together the cylinder chamber 20 of lower piston cylinder unit 14 and the cylinder chamber 28 of the direct upper piston cylinder unit 28 that is provided with over there.
Specifically, the cylinder chamber 20 of lower piston cylinder unit 14 by first connecting line 40 with preferably throughput direction can be reverse and in addition preferably transformable hydraulic press 42 fluids of discharge capacity be connected.The relief valve device 44 that is made of two seat valves 46,48 is set in first connecting line 40.Described seat valve is in series middle to be connected in first connecting line 40.Each seat valve 46,48 all has to the valve piston of closing direction pretension, but described valve piston electromagnetic ground moves to open position.Between relief valve device 44 and hydraulic press 42, divide and pick out bypass line 50.Described bypass line gets around hydraulic press 42, and is connected in the described bypass line 50 in the middle of the by-passing valve 52.By-passing valve 52 has the valve body of opening the direction pretension fully towards by-passing valve 52.But described valve body electromagnetic ground is transformed into the position of the switch.In the described position of the switch, only allowing from the cylinder chamber 20 of lower piston cylinder unit 14 up, cylinder chamber 28 directions of piston cylinder unit 22 flow.Wherein, bypass line 50 imports in second connecting line 54.Described connecting line 54 couples together cylinder chamber 28 fluids of hydraulic press 42 and upper piston cylinder unit 22.In addition, between described remittance position and hydraulic press 42, also connecting accumulator 56.
Be used to operate hydraulic press 42 according to Fig. 1 servo drive 58, and therefore in the power stroke position controllably regulate forcing press beam 10.Described in the present embodiment servo drive 58 is made of motor.Described motor mechanically is connected with hydraulic press 42 by driving shaft.Described motor is being adjustable aspect its rotary speed.
In addition, by first, second connecting line 40,54 and get around on the short circuit circuit that the bypass line 50 of hydraulic press 42 constitutes and be connected with pretension module 60.Described in the present embodiment pretension module 60 is made of magnetic valve 62, and it has valve piston.Described valve piston is tightened to open position in advance by spring, and can be adjusted to the closed position by electromagnet.Described magnetic valve 62 is connected with working media storage tank 66 by storage tank pipeline 64, is pressed onto the working media storage tank 66 in order that according to the position of the switch of the valve piston of magnetic valve 62 pressure medium is unloaded from short circuit circuit 38.With magnetic valve 62 abreast, excess pressure valve 68 is connected with short circuit circuit 38.Described excess pressure valve is opened towards working media storage tank 66 directions when surpassing the maximum pressure of regulation.In addition and excess pressure valve 68 abreast, but manual unlocking be connected with short circuit circuit 38 with the spool 70 of closing, in order that manually working media is discharged into the working media storage tank 66 from short circuit circuit 38.
In addition, pretension module 60 also has preferably adjustable pressure medium pump 72.Described pump drives or can drive by motor 74, and described pump is by taking out pipe 76 suction operation medium from working media storage tank 66.Check-valves 78 and the hand exercisable guiding valve 80 of described compression pump 72 by the spring pretension can be with short circuit circuit 38, particularly be connected with second connection line, 54 fluids.Excess pressure valve 82 is connected with the pump discharge of adjustable compression pump 72 preferably.Described excess pressure valve leads in the working media storage tank 66.
Briefly explain the function of the hydraulic press of preferred embodiment according to the present invention below.
According to present embodiment, in main drive 30, enduringly pressure medium is tightened in advance the pressure in the maximum press power of estimating about the same at any time.By following and top piston cylinder unit 14,22 also preloaded housing 1 constantly.Therefore, be not as defined in the prior art, will periodically unload and pretension in the present embodiment to frame 1.
During the quick acting process (quick acting downwards is up to pressing position and upwards quick acting) do not have fluid to flow through by-passing valve 52(so by-passing valve 52 is what to open), wherein, preload pressure is identical in the cylinder chamber 20,28 of upper and lower piston cylinder unit 14,22.In the described position of the switch of by-passing valve 52, forcing press beam 10 can be by regulating drive unit 35, just by screw rod 32 motion up and down easily.Wherein, the flow resistance that produces by the short circuit circuit 38 that forms is so little, and promptly when pressure frame 10 was not conditioned drive unit 35 maintenances, its can descend owing to its deadweight.Electromagnetic ground is transformed into open position when this it is pointed out that also promptly that preferably relief valve device 44 that the safety valve 46,48 by two series connection constitutes is in normal operation.
In the power stroke, just in the following motor segment of forcing press beam 10, from compacting 12 touch the workpiece that rests on the deep-draw pad 4 that constantly, by-passing valve 52 is cut off, and hydraulic press 42 is activated by servo drive 58.This in a flash hydraulic press 42 in the mode of closed loop/open loop control the cylinder chamber 20 of pressure medium from lower piston cylinder unit 14 is transported to the cylinder chamber 28 of upper piston cylinder unit 22, perhaps be transported in the accumulator 56 that connects previously.When forcing press beam 10 or position compacting 12 thereon reached stamping parts (workpiece) and go up, a part that only is delivered to the power in the frame 1 by lower piston cylinder unit 14 was directed in the frame 1 abreast by stamping parts and lower piston cylinder unit 14 now so far.Therefore, the overall balance in the power of the power of frame 1 upper support or introducing does not change.Therefore, the pressure in the cylinder chamber 20 of lower piston cylinder unit 14 is in a controlled manner owing to the pressure medium consumption of hydraulic press 42 descends.So for a long time the cylinder chamber 20 of pressure medium from lower piston cylinder unit 14 is transported to the cylinder chamber 28 of upper piston cylinder unit 22 in this case, promptly reached the terminal location of its regulation up to forcing press beam 10 or position compacting 12 thereon, described terminal location is determined by position sensor 86, perhaps up to reaching predetermined press power.Therefore, after reactive pressure was reduced to corresponding numerical value in the cylinder chamber 20 of lower piston cylinder unit 14, described press power produced the preload pressure in the cylinder chamber 28 that is not present in upper piston cylinder unit 22 substantially with changing.
At last,, change the direction of rotation of hydraulic press 42, like this, in the cylinder chamber 20 of lower piston cylinder unit 14, form, under the situation of this preload pressure, reappear pressure balance up to the pressure that reaches preload pressure in order to cancel press power.
Therefore stipulate in form of implementation according to the present invention that the deadweight of forcing press beam 10 comprises that compacting 12 grade that are installed on it all are that just screw rod 32 is born by adjusting drive unit 35.Reach pressure balance in the cylinder chamber 20,28 of superincumbent and following in this case piston cylinder unit 14,22.Just the pressure in the cylinder chamber 20 of lower piston cylinder unit 14 has reduced in pressing process, and the pressure in the cylinder chamber 28 of upper piston cylinder unit 22 remains unchanged on the contrary.Wherein, the press power that affacts on compacting 12 or the pull and stretch pad 4 is equivalent to the pressure reduction that preload pressure reduces to change in the cylinder chamber 20 of lower piston cylinder unit 14.
Can stipulate instead also that for this reason forcing press beam 10 is remained in a kind of like this position by lower piston cylinder unit 14, that is to say that it is unable regulating drive unit 35 when inactive state.For the machine beam 10 that keep-ups pressure, by-passing valve 52 keeps cutting out in the position of predesignating in such a case, just and just be transformed into open position by regulating drive unit 35 for quick acting.In this case, regulate drive unit 35 and be loaded by the pressure reduction between the following and top piston pump unit 14,22, described pressure reduction is equivalent to the power that deadweight produced by forcing press beam 10.The process of whole other is identical with the explanation of front.
Fig. 2 shows according to hydraulic press of the present invention.In described hydraulic press, used the adjusting drive unit 35 that designs among replacement Fig. 1.Disclosed main shaft driving device 36 is replaced by electro-hydraulic servo drive 88 in Fig. 1 in this case.Described servo drive has the cylinder 90 of adjusting.Described adjusting cylinder and upper piston cylinder unit 22 are installed on forcing press beam 10 and the upper support arm 8 abreast, and described adjusting cylinder 90 has two cylinder chambers that are used for 10 liftings of forcing press beam.In addition, pressure medium pump 92 also is set.Can pressure medium be provided for selectively two cylinder chambers regulating cylinder 90 respectively by described pressure medium pump.Described pressure medium pump 92 mechanically drives by adjustable motor 94.The hydraulic press of other technical construction of all of the hydraulic press of Fig. 2 and Fig. 1 is identical, therefore can be referring to the explanation of front at this.
It is pointed out that at last hydraulic press according to the present invention is equipped with four piston cylinder unit.Described piston cylinder unit is arranged on the both sides of compacting head or pull and stretch pad.Yet six or eight piston cylinder unit can be set also instead.Replace and the coefficient position sensor of forcing press beam, also can detect the position of piston of described piston cylinder unit.Also can the volume of the working media that squeezes out from the cylinder chamber be detected, and therefrom calculate the physical location of forcing press beam.Can only determine the position of some at last by limit switch, described limit switch is activated or deexcitation through out-of-date at the forcing press beam, to trigger corresponding transfer process.
As illustrating in the specification preface, accumulator is the preload pressure that is used for being stabilized in the short circuit circuit, and reduces the maximum required transmission power of hydraulic press.Yet also can cancel this accumulator according to the principle of direct drive unit.
Claims (10)
1. hydraulic press, has frame (1), forcing press beam (10) is bearing on the described frame movably, described forcing press beam can be by main drive (30) operation of hydraulic pressure, it is characterized in that, main drive (30) has at least two piston cylinder unit (14,22) that are supported on the frame (1), by the power that is produced in piston cylinder unit (14,22) by preload pressure forcing press beam (10) is clamped between the described piston cylinder unit.
2. according to the described hydraulic press of claim 1, it is characterized in that, preload pressure in the piston cylinder unit (22) that pressing direction works is equal to, or greater than adjusting or adjustable maximum press power of main drive (30), and described press power is applied in the workpiece process that is used to stipulate.
3. according to claim 1 or 2 described hydraulic press, it is characterized in that, under the situation of not operating main drive (30), when forcing press beam (10) is in outside the workpiece active position, on two piston cylinder unit (14,22), there is identical preload pressure.
4. according to each described hydraulic press of aforementioned claim, it is characterized in that, be provided with and regulate drive unit (31), in order to carry out adjustment movement fast, described adjusting drive unit (31) is connected with forcing press beam (10) effect abreast with main drive (30).
5. according to the described hydraulic press of claim 4, it is characterized in that, when forcing press beam (10) is in outside the workpiece active position, do not operating under the situation of main drive, regulate drive unit (35) and apply confining force for forcing press beam (10), this confining force remains on the forcing press beam in the described position.
6. according to claim 4 or 5 described hydraulic press, it is characterized in that, regulating drive unit (35) is the electrical servo drive unit (36) with driving shaft (32), or has the electric hydaulic servo drive (88) of adjusting cylinder (90).
7. according to each described hydraulic press of aforementioned claim, it is characterized in that, described interactional piston cylinder unit (14,22) passes through hydraulic circuit (38) short circuit, the middle hydraulic press (42) that can oppositely carry that is connected with in described hydraulic circuit (38).
8. according to the described hydraulic press of claim 7, it is characterized in that, hydraulic press (42) can pass through bypass line (50) and middle by-passing valve (52) bridge joint that is connected, described by-passing valve is closure when operation main drive (30), and opens when drive unit (35) is regulated in operation.
9. according to each described hydraulic press of aforementioned claim, it is characterized in that, be provided with and be used to provide the pretension module of predesignating or can predesignate size (60) of preload pressure.
10. according to each described hydraulic press of aforementioned claim, it is characterized in that, be provided with and the coefficient pull and stretch pad (4) that is supported on the frame (1) of forcing press beam (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201010012126 DE102010012126A1 (en) | 2010-03-20 | 2010-03-20 | Hydraulic press for joining, transforming and separating large and/or thick walled metallic workpieces, has pressing bar clamped between upper and lower piston cylinder units by force resulting from cylinder units |
| DE102010012126.6 | 2010-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102189698A true CN102189698A (en) | 2011-09-21 |
Family
ID=43977009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100660582A Pending CN102189698A (en) | 2010-03-20 | 2011-03-18 | Press machine with pretightening frame |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102189698A (en) |
| DE (1) | DE102010012126A1 (en) |
| IT (1) | ITMI20110338A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862455A (en) * | 2017-02-03 | 2017-06-20 | 清华大学 | Have the heavy difunctional press Moving beam balance control loop of backhaul and loading function concurrently |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012015118B3 (en) * | 2012-04-17 | 2013-10-10 | Hoerbiger Automatisierungstechnik Holding Gmbh | machine press |
| DE102014226236A1 (en) * | 2014-09-29 | 2016-03-31 | Robert Bosch Gmbh | Hydraulic circuit and machine with a hydraulic circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2557750A1 (en) * | 1975-12-20 | 1977-06-23 | Volkswagenwerk Ag | Press for two or more workpieces - has controlled transfer of fluid between two sets of press pistons |
| US4304540A (en) * | 1980-09-15 | 1981-12-08 | Hammon Carl K | Hydraulic press |
| DE2755495C2 (en) * | 1976-12-14 | 1987-12-10 | Redicon Corp., Canton, Ohio, Us | |
| CN2931088Y (en) * | 2006-04-28 | 2007-08-08 | 郑良才 | Overhead hydraulic cylinder type four-column pressing machine |
| CN200967285Y (en) * | 2006-10-25 | 2007-10-31 | 南京东部精密机械有限公司 | Head beam device for middle-small-sized crank block type full-automatic dry powder press |
| CN101125466A (en) * | 2007-09-13 | 2008-02-20 | 天津市天锻压力机有限公司 | Two-beam and four-post hydraulic machine pressing machine |
-
2010
- 2010-03-20 DE DE201010012126 patent/DE102010012126A1/en not_active Withdrawn
-
2011
- 2011-03-04 IT ITMI20110338 patent/ITMI20110338A1/en unknown
- 2011-03-18 CN CN2011100660582A patent/CN102189698A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2557750A1 (en) * | 1975-12-20 | 1977-06-23 | Volkswagenwerk Ag | Press for two or more workpieces - has controlled transfer of fluid between two sets of press pistons |
| DE2755495C2 (en) * | 1976-12-14 | 1987-12-10 | Redicon Corp., Canton, Ohio, Us | |
| US4304540A (en) * | 1980-09-15 | 1981-12-08 | Hammon Carl K | Hydraulic press |
| CN2931088Y (en) * | 2006-04-28 | 2007-08-08 | 郑良才 | Overhead hydraulic cylinder type four-column pressing machine |
| CN200967285Y (en) * | 2006-10-25 | 2007-10-31 | 南京东部精密机械有限公司 | Head beam device for middle-small-sized crank block type full-automatic dry powder press |
| CN101125466A (en) * | 2007-09-13 | 2008-02-20 | 天津市天锻压力机有限公司 | Two-beam and four-post hydraulic machine pressing machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862455A (en) * | 2017-02-03 | 2017-06-20 | 清华大学 | Have the heavy difunctional press Moving beam balance control loop of backhaul and loading function concurrently |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102010012126A1 (en) | 2011-09-22 |
| ITMI20110338A1 (en) | 2011-09-21 |
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Application publication date: 20110921 |