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

Definitions

• the invention relates to an expanding tool for pipes.
• Such an expanding tool is known from JP-A-02080884.
• Such expanding tools are mainly used in the sanitary sector to expand the ends of pipes in a cylindrical manner.
• a second pipe is inserted into the widened pipe end and connected to it by soldering.
• the expanding tools have several expanding sections which can be displaced radially outwards by means of a mandrel which can be axially displaced in the expanding tool.
• the expansion sections are sector-shaped and lie against one another in the starting position. To expand them, they are pushed radially outwards by the mandrel, being removed from one another. As a result, there are gaps on the outer circumference between the individual sector-shaped expansion sections. As a result, the widened pipe end is not round in these areas.
• the pipe end thus widened therefore has a polygonal inner contour.
• the expansion sections are diametrically opposite one another in pairs, the one pair of expansion sections being arranged axially slightly offset from the other pair of expansion sections.
• the expanding sections only touch the inner wall of the pipe to be expanded.
• Expanding tools are also known (JP-A-02080884), which are conical and have a thread-like outside. With it they engage in a correspondingly threaded tube end. For expansion, the expansion tool is rotated about its axis, the expansion tool being displaced into the tube as a result of the intermeshing threaded sections, thereby expanding the tube end.
• the widened pipe end widens conically and is profiled according to the thread.
• a tool is also known (FR-A-2 549 748) with which constrictions at the end of a pipe are removed again. With this tool, however, pipes are not expanded in diameter.
• the invention has for its object to design the generic expanding tool so that the tube ends can be expanded perfectly cylindrical with little stress on the tube.
• pipe ends can be expanded cylindrically. It is part of an expanding device that is designed as a portable device that the user can carry comfortably.
• the expanding device has two clamping jaws 2 and 3 as a holding device, which can be connected to one another by clamping screws 4.
• the pipes 5 to be expanded are clamped between the two clamping jaws 2 and 3.
• approximately semi-circular recesses 6, 7 are provided in cross-section, into which the pipe 5 to be expanded can be inserted.
• the clamping jaws 2, 3 can have depressions of different sizes, so that tubes 5 of different sizes can be processed with the expanding device.
• the expanding device can also have quick-release fasteners so that the clamping jaws 2, 3 can be quickly released from one another and connected to one another.
• One jaw in the exemplary embodiment the jaw 3, is provided with a plug-on part 8, preferably integrally formed with it, which is plugged onto a neck piece 9 of a drive unit 10.
• the plug-on part 8 is clamped on the neck piece 9.
• a clamping ring can be used for this.
• this clamping ring 11 is part of the plug-on part 8.
• a drive spindle 12 of the drive unit 10 is rotatably mounted in the neck piece 9 of the drive unit 10, which can be, for example, a conventional drilling machine.
• a driver 13 which has a polygonal outline, is screwed onto the drive spindle 12.
• a sleeve-shaped drive part 14 is axially displaceably mounted on it and engages with an external thread 15 in an internal thread 16 of the plug-on part 8.
• the drive part 14 has at its end facing the drive spindle 12 a radially outwardly directed flange 17, which serves as a stop to limit the displacement movement of the drive part 14 axially inwards.
• the flange 17 can cooperate with a counter-stop 18, which in the exemplary embodiment is designed as a ring and bears on the inner wall of the plug-on part 8 and on the end face on the neck piece 9.
• the counter-stop 18 can also be a snap ring, for example, which is inserted into a groove in the inner wall of the push-on part 8.
• This counter-stop 18 can also be formed by a radially inwardly projecting projection of the plug-on part 8.
• the counter-stop 18 has the advantage that it precisely defines the retracted position of the drive part 14.
• the counter-stop 18 is accommodated in a section 19 of the plug-on part 8 which has an inner diameter.
• a stop surface 21 is formed which is transverse to the axis of the plug-on part and lies in the path of movement of the flange 17 of the drive part 14. The stop surface 21 thus determines the outermost position of the expanding tool 1.
• the internal thread 16 is provided in the end section 20 of the plug-on part 8.
• the driver 13 is designed as a sleeve and is placed on a driver part 22 of the drive spindle 12 and releasably connected to it by a screw 23.
• the screw 23 is protected inside the driver 13.
• the drive part 14 is provided at its end projecting beyond the driver 13 with a blind hole 24 into which the expanding tool 1 with a shaft 25 is inserted.
• the expanding tool 1 is detachably connected in a suitable manner to the drive part 14, so that different expanding tools 1 can be used or damaged expanding tools can easily be replaced.
• the expanding tool 1 has a base body 26 which carries a thread-like web 27. With it, the tube 5 is expanded in a manner to be described at its end 28.
• the web 27 projects radially beyond the base body 26 and extends in the form of a thread. In the illustrated embodiment, this web 27 extends over the entire axial length of the base body 26. It is of course possible to provide the web only over part of the length of the base body 26.
• the shaft 25 connects axially to the base body 26 and is preferably formed in one piece with it. The web 27 extends on the base body 26 to the level of the connection to the shaft 25.
• the increase in the working diameter 29 takes place via at least one thread turn. In the illustrated embodiment, this increase in the working diameter 29 takes place over three threads. This makes the expansion process optimal, since the tube end 28 is gradually expanded to the final diameter. This also reduces the risk that the material of the tube 5 will break or tear during the expansion process.
• the increase in the working diameter 29 is advantageously carried out continuously, so that the tube 5 can be expanded properly.
• the final working diameter 29 of the expanding tool 1 extends over at least one thread, so that sufficient plastic deformation of the tube 5 is achieved and springing back of the expanded tube end 28 to a smaller diameter is avoided. If the expanding tool 1 has the final working diameter 29 over one or more threads of the web 27, the pipe end 28 can be expanded very precisely to the desired diameter.
• the end face 30 of the web 27 is rounded.
• a round thread is advantageously used.
• Such multilayer composite pipes consist, for example, of an inner polyethylene layer to which an aluminum layer is applied with the interposition of an adhesive layer. An outer layer of polyethylene is in turn applied to them via an adhesive layer. Because of the thread-shaped Web 27 such multilayer composite pipes are properly expanded without the risk that the individual layers of this tube will be detached from one another during the expansion process. This is particularly due to the fact that the expansion forces are kept low due to the thread-shaped web 27.
• the multilayer composite pipes can also have a different structure;
• the inner layer or layer can be made of plastic, to which, for example, an aluminum layer is applied as an outer layer with the interposition of an adhesive layer.
• other tubes 5 can also be expanded with the expanding tool 1.
• tubes 5 can be expanded which consist of only one layer of plastic. It is of course also possible to use the expanding tool 1 to expand metallic pipes.
• Fig. 1 the expanding tool 1 is shown in its most retracted position, in which it lies over more than half its length within the narrowed end section 20 of the plug-on part 8.
• the flange 17 abuts the counter stop 18.
• the pipe 5 to be expanded is clamped between the clamping jaws 2, 3.
• the pipe end 28 to be expanded projects beyond the clamping jaws 2, 3 and is directed against the expanding tool 1.
• the drive unit 10 is switched on, so that the drive spindle 12 is rotated about its axis. It takes the driver 13 with it. Since it has an angular outer contour, the drive part 14 is also taken in the direction of rotation.
• the drive part 14 is axially displaced on the driver 13 and the expanding tool 1 is pushed into the pipe end 28.
• the pipe end 28 is continuously expanded until the expanding tool 1 with its largest working diameter 29 is effective within the pipe end 28. Since the expanding tool 1 Has the largest working diameter over several threads of the web 27, the tube end 28 is reliably expanded cylindrically. Since the web 27 is thread-shaped, there is a linear contact between the web 27 and the inner wall of the pipe end 28 over its circumference, as seen in the direction of advance of the expanding tool 1. As a result, the tube end 28 is properly expanded cylindrically.
• the expansion device Since the expansion device is attached to the neck piece 9 of the drive unit 10, the reaction torque occurring when the tube 5 is expanded is absorbed by the drive unit 10, so that the user of the expansion device does not have to absorb the counter torque. As a result, the tube end 28 can be easily expanded with little effort using the expanding device.
• the drive parts of the expanding device namely the drive spindle 12 with the driver part 22, the sleeve-shaped driver 13 and the drive part 14, are accommodated in the plug-on part 8, so that these parts are reliably protected against damage and / or contamination.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Dowels (AREA)
• Earth Drilling (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
• Drilling Tools (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7909765

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Family Cites Families (5)

• 1999
  • 1999-06-01 DE DE19924898A patent/DE19924898A1/de not_active Withdrawn
• 2000
  • 2000-05-25 AT AT00111236T patent/ATE262991T1/de not_active IP Right Cessation
  • 2000-05-25 EP EP00111236A patent/EP1060809B1/de not_active Expired - Lifetime
  • 2000-05-25 ES ES00111236T patent/ES2214192T3/es not_active Expired - Lifetime
  • 2000-05-25 DE DE50005849T patent/DE50005849D1/de not_active Expired - Lifetime

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