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
  • B30B1/323—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 using low pressure long stroke opening and closing means, and high pressure short stroke cylinder means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C23/00—Extruding metal; Impact extrusion
  • B21C23/21—Presses specially adapted for extruding metal
  • B21C23/211—Press driving devices

Definitions

• the invention relates to a master or press cylinder of a pipe and extrusion press, which is arranged in a cylinder spar and has in its cylinder housing a plunger connected to a rod projecting from the cylinder housing.
• a pipe and extrusion press designed as a frameless metal extrusion press, in which the rods of the plunger are designed as piston rods, which take the place of the tie rods or columns in the usual frame design by being connected to the counter beam, with two such main or press cylinder has become known from DE 198 35 717 A1.
• the master cylinders are therefore designed with an approximately equal stroke volume on both sides of the master plunger and switchable connections of the two-sided cylinder subspaces.
• the plungers of the press cylinders held by the cylinder beam are acted upon, for which purpose the piston rods of the press pistons extend into the runner beam and are connected to the latter.
• the plungers with their piston rods are drilled hollow over part of their length to form cylinder bores into which plungers plunge, which are supported on the covers closing the cylinders.
• the plunger and with it the piston rod of the barrel can be returned to the starting position.
• Additional piston-cylinder units are also supported on the base frame of this press, in order to be able to move the running bar in idle stroke / rapid traverse.
• the invention is therefore based on the object to provide a master cylinder or a press cylinder of the type mentioned which, while maintaining a short-circuit line technique for rapid movement, enables a quick transition of the pressure oil from one room to another in a simpler manner, at the same time reducing the construction effort and
• a press design is permitted which offers sufficient free space in front of the counter spar in order to be able to produce strand products with radii or curvatures without hindrance.
• the rod is formed with an integrated feed and retraction cylinder and receives an epee tube in an axial hollow bore with the formation of a pressure chamber, which is concentrically formed by a jacket housing with the formation of an annular gap which is fluidically connected to the pressure chamber enclosed and with one end protruding from the rod is held stationary together with the jacket housing in a hydraulic connection block which has a line connection opening into the epee tube and into the annular gap.
• the pressure oil supply is controlled or reversed with the known hydraulic means in such a way that it reaches the space in front of it in the axial hollow bore of the rod for rapid advance via the epee tube or for rapid return via the pressure space and from there into the annular gap, whereby the respective loading of the plunger is supported accordingly by this additional amount of oil.
• a proposal of the invention therefore provides that the hollow bore with one in the pressure chamber immersed, piston-like, attached to the end of the rod end, on the casing housing when pressure is applied to the casing is sealed against the casing.
• the rod seal which delimits the pressure space to the rear, slides on the jacket housing, which is held stationary together with the epee tube, into its front end position. If the system then switches to return flow, the pressure oil that flows through the annular gap and flows into the pressure chamber acts on the rod seal.
• the end of the epee tube lying in the hollow bore is designed as a head thickening which seals the annular gap and by means of which the epee tube is fastened to the casing housing, which is formed at this end as a radial collar sealed against the inner wall of the hollow bore.
• the sealed radial collar of the jacket tube is advantageously used at the same time for the fluidic connection of the annular gap to the pressure space between the jacket housing and the inner wall of the axial hollow bore of the rod, according to the invention by providing the annular gap with bores adjacent to the pressure chamber.
• the cylinder space of the master cylinder housing can be formed with a guide for the plunger and the cylinder housing base with a guide for the rod.
• a cross-member which is otherwise required for the press ram can be dispensed with, since the ram can be attached to the plunger itself and protrudes toward the counter beam of the extrusion press.
• There is a certain two-point Guidance in front namely in the area of the front cylinder housing and on the other hand in the area of almost the entire thickness of the cylinder housing base for the rod.
• a construction of the tube and extrusion press or metal extrusion press can thus be realized in which, due to the formation of the forward and retracting cylinders in the position of the rod which extends backwards beyond the cylinder spar beyond the cylinder spar, in the working space between the cylinder and counter beam of the press are no longer unnecessarily affecting the work area components and side cylinders and a punch crossbar can even be omitted entirely.
• a further solution to the problem on which the invention is based proposes according to the invention for a generic tube and extrusion press that the freely projecting end of the rod is enclosed by an expansion tank attached to the master cylinder housing, in which, when the plunger is pressurized, a sealed against the inner wall of the container on which the Master cylinder housing removed rod end slide slides, the fluid between the rod and the expansion tank, which is closed at the end by the slide, is connected in terms of flow technology to the cylinder space of the master cylinder housing behind the plunger, into which a pressure oil line also opens.
• the filling chamber of the expansion tank is also connected to a tank line, and that switchable check valves are preferably also arranged in the connecting lines formed in the cylinder housing bottom and leading from the filling chamber to the cylinder chamber behind the plunger.
• This can be achieved that to advance the plunger in its working position this with open shut-off valves, four of which are present, designed as two-way cartridge valves, which are also known as logic or cartridge valves, from which the filling chamber of Expansion tank supplied oil is washed around.
• the oil then flows back into the compensating cylinder, ie the oil is pushed back and forth under pressure during operation of the pipe and extrusion press.
• the mode of operation with a compensating cylinder is particularly suitable in combination with a pull-in and pull-back cylinder of the type described above, because then no side cylinders are required for the forward and backward movement.
• an extrusion press 1 shown as a plan view in section, executed in a horizontal construction, only one cylinder spar 2 with master cylinder or press cylinder 4 attached to it via its cylinder housing 3 is shown in the figure. Seen from the left in the direction of the drawing, the cylinder beam 2 is opposite a counter beam - not shown - equipped with a tool (pressure plate, die holder and die).
• a plunger 5 is arranged, which is provided at its front end in the pressing direction 6 with a press ram 7 which, when the plunger 5 is acted on, presses a block previously loaded into a receiver by the tool of the counter spar (not shown).
• the rod 9 is formed with an integrated advance and retraction cylinder 12.
• an epee tube 15 and a jacket housing 17 concentrically enclosing this in an axial hollow bore 13 are fixed in a stationary hydraulic connection block 14, including an annular gap 16, the latter in turn defining a pressure chamber 18 with the inner wall of the hollow bore 13.
• the ends of the jacket housing 17 and the epee tube 15 which plunge into the axial hollow bore 13 of the rod 9 are designed as a radial collar 19 sealed against the inner wall of the hollow bore 13 or a head thickening 20 which seals the annular gap 16.
• a packing 21 which seals the pressure chamber 18 and slides on the jacket housing 17 when the plunger 5 moves, is screwed onto the rod 9.
• bores 22 are machined in the radial collar 19 of the casing.
• the hydraulic connection block 14 has a line connection 23 or 24 opening into the epee pipe 15 and into the annular gap 16, which are connected via lines 25 or 26 to an oil supply (not shown) and the usual hydraulic unit.
• oil flows from an oil supply into the cylinder chamber 28 behind the plunger 5 via a pressure oil line 27 and at the same time via the line 25 and the connection 23 into the epee tube 15, so that this additional oil quantity is in one in front of the radial collar 19 and the head thickening 20 lying pressure chamber 29 of the hollow bore 13 of the rod 9 and supports the forward stroke.
• the exemplary embodiment according to the drawing further shows that the rod 9 formed with the integrated forward and retracting cylinder 12 is further combined with an expansion tank 30 screwed onto the cylinder housing base 8. This is closed at its rear end by a slide 31 fixed to the rod 9, the outer surface of which slides in a sealed manner during lifting movements over the inner wall of the container.
• the hydraulic connection block 14 for the integrated feed and retraction cylinder 12 of the rod 9 is screwed here with a bell 32, which in turn is screwed onto the end face of the expansion tank 30.
• the filling space 33 enclosed between the expansion tank 30 and the rod 9 and the cylinder housing base 8 and the slide 13 stores oil, which from there either in the cylinder space 28 behind the plunger 5 via connecting lines 35 provided in the cylinder housing base 8 or via a tank line 34 into a tank or can flow in reverse in the event of opposing loading and is thus pushed back and forth.
• switchable shut-off valves 36 in a cartridge design are arranged in the connecting lines 35 in their open operating position, so that the oil from the slide 31 from the filling chamber 33 into the cylinder or Plunger space 28 pushed out.
• the check valves 36 In the pressing position, the check valves 36, of which there are a total of four, are closed via their control lines 37 connected to the hydraulic unit, and the pressure oil required for pressing the strand is only fed into the cylinder chamber 28 via the pressure oil line 27.
• the tank line 34 which is simultaneously opened during this operating phase, the slide 31, in its movement continuing with the pressing stroke in the pressing direction 6, presses the amount of residual oil remaining in the filling chamber 33 into one Tank.
• the end position assumed by the slide 31 during the press working stroke is shown in dash-dot lines (see FIG. 31 ').

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Actuator (AREA)
• Press Drives And Press Lines (AREA)
• Extrusion Of Metal (AREA)
• Electric Cable Installation (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=30469564

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (6)

Family Cites Families (10)

• 2002
  • 2002-08-08 DE DE10236297A patent/DE10236297A1/de not_active Withdrawn
• 2003
  • 2003-08-05 EP EP03778235A patent/EP1526930B1/fr not_active Expired - Lifetime
  • 2003-08-05 AT AT03778235T patent/ATE366152T1/de active
  • 2003-08-05 WO PCT/DE2003/002621 patent/WO2004018120A1/fr active IP Right Grant
  • 2003-08-05 JP JP2004529710A patent/JP4149995B2/ja not_active Expired - Lifetime
  • 2003-08-05 ES ES03778235T patent/ES2289343T3/es not_active Expired - Lifetime
  • 2003-08-05 DE DE50307620T patent/DE50307620D1/de not_active Expired - Lifetime
  • 2003-08-05 US US10/524,644 patent/US7421874B2/en not_active Expired - Lifetime

Non-Patent Citations (1)

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