Classifications

• • 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
  • B21D41/00—Application of procedures in order to alter the diameter of tube ends
  • B21D41/02—Enlarging
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining
  • Y10T29/49908—Joining by deforming
  • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
  • Y10T29/4994—Radially expanding internal tube

Definitions

• the invention initially relates to an expanding tool for expanding pipe ends, the expanding tool having an expanding mandrel and a counterholder, the expanding mandrel further comprising a pull rod and an elastic rubber mounting element surrounding it, and the counterholder supporting the expanding element on the foot side and radially surrounds by far.
• the expansion tool according to the invention can be attached in the simplest manner to conventional hydraulic devices, in particular pressing devices, which roll act on the eit tool, in particular on the push rod element.
• the expanding tool according to the invention is designed such that by applying pressure to the push rod elements, for example via the rollers of a pressing device, the counter-holder is displaced relative to the pull rod anchored in the bolt fastening element, which increases the expansion of the pull rod surrounding and against the foot side Bracing support expanding rubber element causes.
• the expanding tool is rigidly connected via the bolt fastening element to the device acting on the push rod element, but is preferably interchangeable.
• the bolt fastening element has a bolt receiving bore extending transversely to the axial direction of the drawbar.
• the expanding tool according to the invention can be connected in the simplest way via a bolt connection to the pressing device acting on the push rod element and holding the bolt fastening element by means of a bolt or the like.
• the push rod element is fastened in the counter holder.
• a screw connection can be provided here.
• a welded connection is also conceivable.
• the push rod element pass through the bolt fastening element. Accordingly, the pressurization of the push rod element takes place upstream in the actuating direction of the fastening area of the expanding tool, the push rod element being freely displaceable in the longitudinal direction in the fastening element.
• An embodiment is preferred in which the push rod element is designed like a plunger.
• the push rod element is not fastened to the counterholder, but merely interacts with it, whereby a pressurization of the push rod Geniatas is transferred to the counterholder via the press device to be arranged.
• the widening tool is reset automatically via the restoring properties of the elastic widening element, which, at one end, supports the counterholder on the anchored tie rod and, via this, simply rests the plunger back into the starting position.
• an embodiment has been found in which more than two push rod elements or plungers are provided.
• An embodiment is particularly preferred in which four push rod elements or plungers arranged in a cross section through the push rod elements in a rectangle pass through the bolt fastening element and act on the counter-holder.
• a step is formed on the inside of the pot bottom, which receives a foot region of the expanding element.
• the step on the upper side serves as a stop for a pipe to be expanded, which, in connection with the step formed on the inside, has the advantageous effect that a uniform expansion is achieved up to the end of the pipe to be expanded.
• Different expansion tools can be provided for pipes of different sizes, which can be connected into the respective bolt fastening element with the pressing device or the like.
• a screw-in adapter part is provided in the bolt fastening element for fastening the pull rod, in order to adapt to different pull rod diameters. ser.
• This embodiment proves to be advantageous in particular in connection with the arrangement of plungers which only abut the counter-holder.
• different pull rods and counterholders can be assigned to the same bolt fastening element.
• a pressure plate is arranged in front of the counter holder in the direction of action, on which the pressure rod elements act and that a force limiting device is arranged between the pressure plate and the counter holder.
• the force limiting device preferably consists of a plastic part, the plastic part having a higher rigidity than the expansion element.
• This expansion element can also be a flexible plastic, which has a very high hardness of, for example, 90 to 100 Shore, preferably about 95 Shore.
• This is preferably a polyurethane plastic, over which pressures up to about 200 bar can be generated.
• an expansion transition element is arranged downstream of the expansion element in the direction of action, but nevertheless also caught by the pull rod.
• the latter preferably consists of a plastic part that is limited by compression stops.
• the stop compression by means of a stop sleeve which can be moved against the stop disk which delimits the element there, the stop sleeve further has a sleeve bottom, which is acted upon by a tie rod head and merges into a tube section surrounding the tie rod. Accordingly, the expansion transition element is contained between two sleeve elements, which sleeve elements are moved together with a certain compression and thus do not permit further compression of the expansion transition element.
• a matrix element is accommodated within the counter holder.
• the latter forms a negative shape in the course of the expansion process, into which the tube end is pressed by means of the rubber expansion element. This also prevents the elastomer element from flowing into the gap between the collar and the pipe end in the course of the widening beyond the collar at the end of the pull rod, thereby causing an uncontrolled further expansion of the pipe end.
• the die element can be shaped in the form of half-shells to be screwed on manually, which support the end region of the pipe to be expanded.
• the die element divided in the longitudinal direction is composed of a plurality of sub-dies, for example from four quarter shells each forming a 90 ° circle segment in cross section.
• the die element received in the counterholder or the received partial dies can be displaced in the axial direction relative to the counterholder.
• the matrix element grips under the elastic rubber element, preferably further providing that the matrix element with radially oriented collars in the area of the pull rod between the rubber expansion element and one in the area of a counter shark. ter founded supporting compression spring is caught.
• a partial die can be displaced in the course of the pressing from a removal position for the pipe end to be expanded by axial displacement into a pressing position while reducing the radial distance from the pull rod.
• the partial matrices of the matrix element are displaced radially in the course of the expansion process in the direction of the pipe end to be expanded, after which partial axial sections of the partial matrices rest on the outer wall of the pipe to be expanded, supported by the counter-holder.
• the invention further relates to a pressing device with an expanding tool for expanding pipe ends, the expanding tool comprising an expanding mandrel that consists of a pull rod and an elastic rubber expanding element surrounding it, and a counter-holder that supports the expanding element on the foot side and radially surrounds at a distance.
• the pull rod be firmly connected to the pressing device, while the counter-holder is acted upon by a push rod element. The latter is displaced relative to the pull rod for actuation by the pressing device.
• the pull rod is anchored in a bolt fastening element, the latter serving to fasten the expanding tool to the pressing device.
• the tie rod is rigidly connected to the pressing device via the fastening element.
• the push rod element protrudes in the longitudinal direction of the pull rod beyond the bolt fastening element.
• the bolt fastening element has a bolt to receiving bore extending transversely to the axial direction of the pull rod, for bolt connection of the expanding tool to the pressing device, it being further preferred that the push rod element penetrates the bolt fastening element.
• the push rod element can be freely displaced in the bolt fastening element in the longitudinal direction of the pull rod. It proves to be further advantageous, in particular with regard to an improved power transmission, if more than two push rod elements are provided.
• push rod elements are preferably arranged which penetrate the bolt fastening element outside the bolt receiving bore and are further preferably arranged in a cross section through the push rod elements to be adapted to a rectangular shape.
• the push rod element can be further connected to the counter-holder, for example screw or welded.
• An embodiment is preferred in which the push rod element is provided as an only adjacent one the plunger is not connected to the plunger.
• the pressing device act on the tappets via rollers.
• FIG. 1 shows a view of a pressing device with an arranged expanding tool according to the invention in a basic position
• FIG. 4 shows the section along the line IV-IV in FIG. 2, relating to the basic position of the expanding tool
• FIG. 5 shows a sectional illustration according to FIG. 4, but relating to the working position
• Fig. 6 is a representation corresponding to Figure 2, but relating to a second embodiment of the eit tool.
• FIG. 9 is a sectional view corresponding to FIG. 8, but relating to the working position;
• FIG. 10 shows an enlargement of area XX in FIG. 9;
• FIG. 11 is an exploded perspective view of the expanding tool of the second embodiment
• the expanding tool can be arranged in perspective on a hydraulic pressing device
• FIG. 13 shows a further perspective illustration, after arrangement of the tool on a pressing device
• FIG. 14 shows a partially sectioned, perspective illustration of an expanding tool in a third embodiment, relating to an unloaded basic position
• FIG. 15 shows a longitudinal section through the tool according to FIG. 14;
• FIG. 17 shows a representation corresponding to FIG. 14, relating to the pressing position
• FIG. 19 shows a further illustration corresponding to FIG. 14 after expanding a pipe end
• FIG. 20 shows the longitudinal section to FIG. 19. Shown and described is first of all with reference to FIG. 1 an expanding tool 1 for connection to a hydraulic pressing device 2.
• the latter has a fixed bolt part 3 for fixing the expanding tool 1 and also has a hydraulic piston 4 relative to the fixed bolt part 3 displaceable moving part 5, which in the exemplary embodiment shown is essentially U-shaped in cross section and rotatably supports two moving rollers 6 arranged next to one another.
• the expanding tool 1 serves to expand pipe ends 7, for which purpose the expanding tool 1 has an expanding mandrel 8 and a counter-holder 9.
• the expanding mandrel 8 essentially consists of a pull rod 10 and an elastic expanding element 11 surrounding it, the latter preferably being a polyurethane plastic.
• the pull rod 11 has at one end a pull rod head 12 which supports the expansion element 11 and whose diameter corresponds to that of the expansion element 11 in the unloaded position according to FIG. 4.
• the counter-holder 9 surrounding the expanding mandrel 8 is pot-shaped, with a receiving opening 13 which is free in cross-section in the direction of the pull rod head end and which is delimited radially on the inside by the expanding element 11 and radially on the outside by the counter-holder wall 14 Bracket 9 is movable relative to the tie rod 11 in the longitudinal extension thereof.
• the pot base 15 of the counter-holder 9 facing away from the tie rod head 12 forms a step 16 on the inside, which receives a foot region 17 of the expansion element 11, the diameter of the step 16 being adapted to the diameter of the expansion element.
• the pot base 15 delimited by the counter-holder wall 14 serves as a stop for the pipe end 7 to be widened.
• the edge in the transition area between the pot base 15 and step 16 is provided with a phase 18.
• the pull rod 10 passes through the counter holder 9 in the region of a correspondingly adapted bore 19 in the pot base 15 and is anchored at the end, opposite the pull rod head 12, in a bolt fastening element 20.
• the latter is cuboid in the exemplary embodiment shown and has a threaded bore 21 for anchoring the tie rod 10, into which an end threaded portion 22 of the tie rod 10 engages.
• This bolt fastening element 20 serves to hold the expanding tool 1 on the pressing device 2, for which purpose the bolt fastening element has a bolt receiving bore 23 extending transversely to the axial direction of the pull rod 10. Through the latter, the fixed bolt part 3 of the pressing device 2.
• the bolt fastening element 20 has two guide bores 24 arranged one above the other and aligned in the axial direction of the pull rod 10, on both sides of the bolt receiving bore 23, for the passage of push rod elements 25 in the form of plungers 26.
• the latter protrude on both sides of the bolt fastening element 20 beyond this, the, each with A locking ring 27 provided one ends 28 in the area of the pot base 15, which abuts the counter-holder 9.
• the ends 29 facing away from these ends 28 are provided with radial thickenings 30 against which the traversing rollers 6 of the pressing device 2 bear for pressurizing.
• the pressing device 2 In order to widen a pipe end 7 inserted into the receiving opening 13, the pressing device 2 is actuated, which causes the travel rollers 6 to be advanced by the piston 4. The latter in this case act on the plunger 26, which results in the counter-holder 9 being displaced relative to the pull rod 10 in the direction of movement r.
• the expansion element 11 which is gripped between the pot base 15 or the step 16 and the anchored tie rod head 12, is compressed, which results in a radial expansion thereof and a radial expansion of the pipe end 7 according to FIG. 5 results. This radial expansion is limited by the counter-holder wall 14.
• the piston 4 of the pressing device 2 automatically returns to its starting position according to FIG. 1, as a result of which the rear support of the tappets 26 is released.
• the expanding tool 1 due to the elastic properties of the expanding element 11, automatically returns to the starting position, after which the expanded pipe end 7 can be removed from the receiving opening 13 of the counter-holder 9.
• FIG. 6 to 10 show a second exemplary embodiment of an expanding tool 1 which, as in the exemplary embodiment described above, can be acted upon by a pressing device 2.
• the bolt fastening is
• the supply element 20 is of the same design as the first exemplary embodiment, a screw-in adapter part 31 being screwed into the threaded bore 21 in order to arrange a pull rod 10 for pipe ends 7 of smaller diameter. This allows tie rods 10 with different diameters to be fastened to one and the same bolt fastening element 20. For this purpose, only the appropriate screw-in adapter part 31 must be screwed into the threaded bore 21.
• This screw-in adapter part 31 in turn has a threaded bore 32 for receiving the end threaded section 22 of the pull rod 10, the latter being secured via a lock nut 33.
• the counter-holder 9 of this second embodiment has a pressure plate 34 arranged in front of it in the direction of action r.
• a force-limiting device 35 consisting of a plastic part is arranged between this and the counter-holder 9. This plastic part has a higher rigidity than the on element 11.
• the push rod element 25 or plunger 26 passing through the bolt fastening element 20 act on the pressure plate 34 on the side facing away from the counter holder 9.
• an expansion transition element 36 is arranged downstream of the expansion element 11 in the direction of action r, but nevertheless trapped by the pull rod 10.
• the latter consists of a plastic part 37 which is limited in terms of stop compression and which is held between a stop disc 38 and one Stop sleeve 39, the pipe section 40 surrounding the pull rod 10 carries the plastic part 37, which is annular in cross section.
• the stop disk 38 delimits the expansion element 11 in the end region facing away from the pot bottom 15 of the counter-holder 9 and can be displaced relative to the pull rod 10.
• the stop sleeve 39 is supported against the tie rod head 12.
• the width of the plastic part 37 measured in the longitudinal extent of the pull rod 10 is chosen to be greater than the length of the pipe section 40 measured in the same direction, so that between the free pipe section end and the stop disk 38 there remains a free annular space extending between the plastic part 37 and the pull rod 10 ,
• the push rod elements 25 or tappets 26 are also acted upon in this exemplary embodiment by means of displacement rollers 6 in the direction of movement r, which results in a displacement of the counter-holder 9 together with the pressure plate 34 and the force limiting device 35 in the direction of movement r has against the anchored tie rod 10.
• the force introduced is limited here by the plastic part between the counter-holder 9 and the pressure plate 34.
• the expansion element 11 is also compressed here, with the radial expansion thereof.
• the pipe end 7 is expanded against the counter-holder wall 14 in a manner limited by a stop.
• the force introduced via the plunger 26 causes an axial displacement of the pressure stop disk 38, which limits the end element on the element 11, in the direction of the stop sleeve 39 until the stop disk 38 comes into contact with the pipe section 40 of the stop sleeve 39. This compresses the plastic part 37 caught between the stop disk 38 and the stop sleeve 39.
• the counter-holder 9 has a pressure plate arranged in front of it in the direction of action r
• a matrix element 43 is accommodated within the counter-holder 9, which, as shown, projects in the axial direction over the open end of the cup-shaped counter-holder 9.
• the die element 43 is divided in the longitudinal direction and is composed of four sub-dies 44 which are sector-like in cross section.
• each sub-die 44 has an expansion section 49 and a contact section 50, the transition between expansion section 49 and contact section 50 being at an acute angle of approximately 30 ° to the longitudinal axis.
• the counter-holder 9 On the inside of the wall, the counter-holder 9 is provided with two guide bevels 45, 46 which are spaced apart from one another in the axial direction and extend at an angle of approximately 45 ° to the longitudinal axis of the expanding tool 1.
• the guide bevel 45 facing the pot bottom 15 is arranged at a smaller radial distance from the pull rod 10 than the guide bevel 46 which is further away from the pot bottom 15.
• the matrix element 43 or the partial matrices 44 have guide projections 47, 48 which are formed and positioned in the region of the outer wall of the jacket corresponding to the guide bevels 45, 46 in the region encompassed by the counter-holder 9. In an unloaded basic position according to FIGS. 14 and 15, the guide projections 47, 48 of the partial matrices 44 bear against the guide bevels 45, 46 of the counter-holder 9.
• Each sub-die 44 also has, in the end region facing the pot bottom 15 of the counter-holder 9, a driving section 51 which projects radially inward in the direction of the pull rod 10 and which is interposed by on the pull rod 10, disks 52 which are freely displaceable in the axial direction are acted upon in the axial direction on the one hand by the expansion element 11 and on the other hand by a compression spring 53 which is supported on the pot base 15.
• the arrangement of the partial matrices 44 in the starting position according to FIGS. 14 and 15 is selected such that the side surfaces of the partial matrices 44 to be facing one another leave a gap lying at a distance from one another. Furthermore, the radially inner end edge of the driving sections 51 is also spaced apart from the pull rod 10.
• the push rod elements 25 or plunger 26 are also acted upon in the direction of movement r in this exemplary embodiment. Accordingly, the counter-holder 9 is displaced via the pressure plate 34 and the force limiting device 35 against the anchored tie rod 10.
• the expansion element 11 is compressed via the driving sections 51 of the partial matrices 44 carried along with the counter-holder 9, this carrying along of the partial matrices 44 taking place to a point at which the force of the expanding element 11 acting on the driving sections 51 is greater than that force of the compression spring 53 acting in the opposite direction on the driving sections 51.
• This displacement of the partial matrices 44 radially inward is limited by the abutment of the contact sections 50 on the outer wall of the pipe to be expanded and / or by the application of the side surfaces of the submatrices 44 facing one another.
• the partial matrices 44 are supported radially outward on the plane between the guide bevels
• the counter-holder 9 is moved back into the starting position via the driving sections 51 of the partial dies 44, due to the elastic restoring properties of the expanding element 11.
• the sub-matrices 44 are then initially still in their radially inward position, but without radial outer support by the pot wall of the counter-holder 9.
• the pipe end 7 can then be pulled out of the expanding tool 1 in the axial direction in the simplest manner, with displacement the sub-matrices 44 radially outwards, due to the intermediate see widening sections 49 and contact sections 50 formed bevels, which also occur with the widened pipe end 7.
• the starting position according to FIGS. 14 and 15 of the expanding tool 1 is then established.
• the expansion tool 1 described can be arranged on a conventional pressing device 2.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)
• Press Drives And Press Lines (AREA)
• Earth Drilling (AREA)

Applications Claiming Priority (5)

Publications (2)

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• 2002
  • 2002-02-05 US US10/470,515 patent/US7065995B2/en not_active Expired - Lifetime
  • 2002-02-05 EP EP02704680A patent/EP1360019B1/fr not_active Expired - Lifetime
  • 2002-02-05 AT AT02704680T patent/ATE294036T1/de active
  • 2002-02-05 WO PCT/EP2002/001149 patent/WO2002062504A1/fr not_active Ceased
  • 2002-02-05 ES ES02704680T patent/ES2237665T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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