Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
  • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
  • B21D26/033—Deforming tubular bodies
• • 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

Definitions

• Hydraulic pressure intensifier unit in particular for a press working according to the hydroforming process
• the invention is based on a hydraulic pressure intensifier unit, which is used in particular on a press working according to the hydroforming process and which has the features from the preamble of claim 1.
• Such a hydraulic pressure intensifier unit is e.g. known from DE-GM 18 85 909 or from DE 43 12 589 AI.
• the docking cylinder has a docking piston to which a docking piston rod is fastened, which, viewed from the primary piston of the pressure booster, emerges through a housing head located beyond the docking piston.
• Docking piston and docking piston rod are provided with a central bore into which the secondary piston of the pressure booster is immersed.
• the docking piston also carries a piston rod on its side facing the primary piston of the pressure booster, which is likewise pierced in the longitudinal direction.
• this second piston rod of the docking piston emerges through a housing base.
• the second piston rod of the docking cylinder is only immersed in the housing base.
• the docking cylinder first has the task of keeping the blank, which is usually a piece of pipe, closed. In many forming operations, it also has the function of axially feeding material from the blank during forming.
• the aim of the invention is to provide a hydraulic pressure intensifier unit with the features from the preamble of To further develop claim 1 so that greater forces than previously can be exerted with the docking cylinder and that a shorter construction is possible.
• the docking piston has a piston rod only on one side, namely the docking piston rod which passes through the housing head to the outside.
• the inside diameter of the annular surface located on the side of the docking piston opposite the docking piston rod is reduced to the outside diameter of the secondary piston of the pressure booster.
• the annular surface is thus enlarged compared to the known hydraulic pressure booster units, so that a larger force can be exerted without increasing the outer diameter of the docking piston and without increasing the effective pressure.
• the unit is now also shorter, since the first cylinder space and the second cylinder space can be moved closer together.
• the subclaims contain advantageous configurations of a hydraulic pressure booster unit according to the invention, which relate to the sealing of different pressure chambers from one another and the removal of leakage fluid.
• FIG. 1 schematically shows the exemplary embodiment in its entirety
• FIG. 2 shows a detail of a section in the region of two case drain liquid passing through the docking piston rod.
• channels and Figure 3 shows a section along the line III-III of Figure 2.
• the hydraulic pressure intensifier unit shown comprises a docking cylinder 10, a pressure intensifier 11 and a rapid traverse cylinder 12 for the pressure intensifier 11.
• the parts named with regard to their function cannot be clearly separated from one another locally, but are integrated into one another to form a compact unit.
• the housing 13 of the unit includes a one-piece housing middle part 14 which is common to the docking cylinder 10 and the pressure intensifier 11 and which has a first cylinder space 15 and a second cylinder space 16.
• the two cylinder spaces 15 and 16 are open on opposite sides and separated from one another by a bottom 17 of the housing middle part 14, from which the cylinder jackets 18 and 19 of the two cylinder spaces extend in opposite directions.
• the first cylinder space 15 is closed with a housing head 20 and the second cylinder space 16 with a housing head 21.
• the first cylinder chamber 15 belongs to the docking cylinder 10.
• a docking piston 25 can be axially displaced, which has a piston rod attached to it only on one side. This emerges as a docking piston rod 26 through the housing head 20 to the outside.
• a flange 27 is screwed to its free end, with which a tubular blank 37 to be formed can be closed.
• a central bore 28 extends axially through the docking piston 25 and through the docking piston rod 26, this bore having a section 29 with a smaller diameter and a section 30 with a larger diameter. The latter extends from the end face of the docking piston rod 26 facing the flange 27 to a radial shoulder 31, which is still at an axial distance from the housing head 20 even when the docking piston rod 26 is retracted to the maximum.
• the stage 31 in the bore 28 is not run over by the free end of the docking piston rod 26 in any phase of a working cycle of the pressure intensifier unit.
• the free end of the secondary piston 41 is therefore always axially outside the housing head 20.
• a piston rod 42 which protrudes opposite the secondary piston 41, is fastened, which passes through a bore 43 of the housing head 21 into a cylinder space 44 formed in this housing head and there a rapid-motion piston 45 wearing.
• the cylinder space 44 is closed by a cover 46.
• the rapid-motion piston 45 divides the cylinder space 44 into two partial spaces 44a and 44b, which can each be supplied with a pressure fluid via a channel 47 or 48 in the housing head 21.
• a water-based hydraulic fluid is intended for this.
• a channel 49 passes through the piston rod 42, the primary piston 40 and the secondary piston 41 of the pressure intensifier 11, which is connected by a transverse bore 50 to the one partial space 44a of the cylinder space 44, which is supplied with pressure fluid via the channel 48, and at the mouth thereof the section 30 of the bore 28 is a check valve 51 which closes towards the channel 48.
• the primary piston 40 of the pressure booster 11 can be alternately pressurized on both sides via the channels 52 and 53 passing through the cylinder jacket 19. Hydraulic oil is used as the pressure medium.
• a number of seals are provided to separate the different pressure chambers and the different hydraulic fluids from one another.
• three axially spaced seals 60, 61 and 62 are arranged between the housing head 21 and the piston rod 42. Between the seals 60 and 61 there is a leakage line 63, in which water-based hydraulic fluid leaking from the partial space 44a of the cylinder space 44 is discharged via the seal 60. Between the seals 61 and 62 there is a leakage line 64, via which hydraulic oil leaking from the partial space 16a of the cylinder space 16 is discharged via the seal 62.
• two seals 65 and 66 are arranged at an axial distance from one another, between which a leak line 67 branches off, which, as is usual with a leak line, is connected to a tank and which prevents a mutual influencing of the pressures in the two partial spaces 15a and 16b of the cylinder spaces 15 and 16 separated from one another by the base 17.
• the seal 69 is composed of two axially spaced sealing rings 80 and 81 in accordance with the two possible directions of movement between the docking piston rod 26 and the secondary piston 41.
• the other seals that can be seen in FIG. 1 can also each be composed of a plurality of sealing rings.
• Both leak lines 71 and 72 are each formed by a bore which starts from a flat 82 of the docking piston rod 26.
• the mouth openings of the two bores in the flat 82 are located in the same radial plane 83 of the docking piston rod 26 and are at a distance from one another which is smaller than the diameter of the section 29 of the central bore 28 in the docking piston rod 26. From the mouth openings, the bores 71 and 72 run obliquely axially in opposite directions, but in a projection onto the radial plane 83 parallel to one another inwards and open into the bore 28 on opposite sides of the seal 69.
• a narrow plate 85 is attached to the flat 82 long screws 86 are screwed on, in which the bores 71 and 72 through bores 87 and 88 extend approximately to the outer circumference of the flange 84 and the housing 13. sets are. There, two pipes or hoses can easily be attached to the plate 85.
• the flange 27 first pushes the flange 27 close to the blank 37 to be deformed when the docking piston 25 is in operation.
• the channel 48 Via the channel 48, the partial space 44a of the cylinder space 44, the transverse bore 50, the longitudinal bore 49, the check valve 51, the section 30 of the bore 28 and a bore 75 in the flange 27 hydraulic water-based hydraulic fluid is pressed into the blank, the Air escapes from the blank through a gap between the flange and blank together with hydraulic fluid.
• the pressure in the blank increases. At a certain pressure, the blank is considered filled and is locked by the docking cylinder.
• the subspace 44a is relieved of pressure.
• the check valve 51 closes.
• the rapid traction piston 45 is pressurized via the channel 47 and the partial space 44b and pushes the secondary piston 41 of the pressure intensifier 11 deeper into the bore 28. Since a maximum pressure in the channel 47 cannot be exceeded, the rapid-motion piston 45 can be used to move the secondary piston 41 only up to a certain pressure level in the blank to be formed. From this pressure, in addition to the high-speed piston 45, the primary piston 40 of the pressure booster 11 is pressurized via the channel 52.
• the docking piston 25 can be moved further in order to axially push the material of the blank.
• the liquid in the molded part is first decompressed by partially withdrawing the primary piston 40 and the secondary piston 41 of the pressure intensifier 11. Then the pistons 40 and 41 of the pressure booster 11 and the docking piston 25 are brought back into the starting position shown in the drawing.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
• Actuator (AREA)
• Fluid-Pressure Circuits (AREA)
• Press Drives And Press Lines (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7764032

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (6)

• 1995
  • 1995-06-09 DE DE19521101A patent/DE19521101A1/de not_active Withdrawn
• 1996
  • 1996-06-07 CA CA002224208A patent/CA2224208A1/fr not_active Abandoned
  • 1996-06-07 CZ CZ973960A patent/CZ396097A3/cs unknown
  • 1996-06-07 AT AT96921949T patent/ATE176414T1/de not_active IP Right Cessation
  • 1996-06-07 WO PCT/EP1996/002489 patent/WO1996041692A1/fr not_active Application Discontinuation
  • 1996-06-07 JP JP9502605A patent/JPH11509479A/ja active Pending
  • 1996-06-07 DE DE59601271T patent/DE59601271D1/de not_active Expired - Fee Related
  • 1996-06-07 EP EP96921949A patent/EP0830221B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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