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
  • B21D7/00—Bending rods, profiles, or tubes
  • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
  • B21D7/063—Pliers with forming dies
• • 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
  • B21D7/00—Bending rods, profiles, or tubes
  • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies

Definitions

• the present invention relates to a tool for bending a pipe, which tool includes an operating device, at least one guide and a moving slide therein, two opposing dies, installed on a different plane relative to the movement of the slide, one of which is installed on the said slide to be moved on the guide and driven by the operating device, and the second fixed immovably to the guide, and, when the straight pipe, placed between the dies set in the open position, is arranged to be bent into the shape determined by the dies by pressing them towards each other using the operating device.
• Publication WO 00/47345 discloses a pipe-bending tool according to the preamble, which is especially intended for making pipe offsets on site.
• a strong guide is needed to control the die, because large lateral forces arise during bending and the die that moves at different levels and the die, which moves on different planes, also creates bending in a plane at right angles, by means of a power arm between the planes of movement.
• This publication presented, for the first time, a die arrangement installed on a different level to the slide and the stroke of the operating device.
• the present invention is intended to create a pipe bending tool that is simpler and lighter than previously, which can be used versatilely in different kinds of pipe-bending work.
• the characteristic features of the pipe-bending tool according to the invention are stated in Claim 1.
• the tubular guide according to the invention which is preferably manufactured from aluminium profile, is structurally strong and torsionally rigid. This overcomes both the compression taking place in different planes relative to the pushing and the possible bending stresses created by the asymmetrical die construction.
• the number of components in the tool is small and their unit weight is light in all size classes.
• a battery-powered hydraulic-cylinder pump mechanism which is attached directly to one end of the tubular guide, is used as the operating device.
• the tool according to the invention can be applied quite diversely.
• other applications include cutting devices and compressing-ring installation devices (e.g., ERMETO® compressing-ring joint).
• Figure 1 shows an axonometric view of the pipe-bending tool according to the invention, without the operating device,
• Figure 2 shows a top view of the tool of Figure 1
• Figure 3 shows an end view of the tool of Figure 1 without the retainer
• Figures 4a and 4b show cross-sections of the tool, in the open and closed positions
• Figure 5 shows the guard-plate arrangement of the tool
• Figure 6 shows an axonometric view of one prototype of the tool.
• the main components of the tool according to Figures 1 - 3 are a tubular guide 14, in which there is a widened support surface 14.1 on the unified upper surface of a fin component 14.2, on top of which the first die 13 moves.
• the second die 12 is fitted permanently to the end of the guide 14.
• the dies can be changed and generally the tool in- eludes a die series for pipe of different sizes, as well as special dies for the said offset.
• the width of the widened support surface 14.1 is 2,5 times that of the tubular component while the fin component 14.2 thins towards the edges ( Figure 3) .
• a retainer 11 is drawn in Figure 1, but is not shown in the other figures.
• the retainer 11 allows the device to be secured in, for example, a vice (not shown) .
• the slide mechanism is entirely inside the guide 14. Its con-
• the fixed die 12 is attached, with the aid of a pin 12.1, to 25 the end of the guide 14, the pin also penetrating the end piece 25.
• the fixed die 12 there is an end flange 12.2, which prevents it from rotating relative to the pin 12.1.
• the moving die 13 is fixed to the slide 15 with the aid of the pin 13.1.
• the tubular construction of the guide 14 is weakened by the gap 20, but this weakening is entirely compensated by the wide fin component 14.2.
• the pins 12.1 and 13.1 can be manufactured according to stan- dards DIN 6325 or DIN 7979. They can be equipped with a quick-locking element, for example, a wing nut, or a spring-loaded ball, which can also be in the die itself. On the guide 14 side, an interference fit can be advantageously used in the attachment of the pin 12.1, 13.1.
• the gap 20 represents a safety and fault risk when it is open, it is covered by a guard-plate mechanism, which is shown in the exploded drawing in Figure 5.
• the pin 13.1 of the fixed die 13 moves the thin cover plate 22, in which there is a wide opening 22.1.
• the cover plate 22, for which there is a shallow groove 23 in the support surface 14.1 of the guide 14, is covered by a unified thin top plate 21, in which there is a gap 20.1 (corresponding fully to the gap 20) and an attachment lug 21.1.
• the top plate 21 is secured by attachment screws 29 and additionally by the threaded end 25 to the guide 14.
• the slight curve of the cover plate 23 and its path (groove 23) have been shown to be advantageous operationally.
• the aforementioned guard-plate mechanism is not used and thus the gap 20 is visible.
• the battery-operated operating device 16 e.g., Dubuis SA, France; model CG85 elect., or Gustav Klauke Gmbh, Germany; models ES85, ESG85PLUS, all without cable cutters
• the battery-operated operating device 16 is attached with the aid of the threaded collar 30 to the tool 10, which can rotate relative to it to a limited extent.
• the aforementioned battery-operated operating device creates a 55-kN force on a 32-mm diameter piston, which corresponds to a pressure of 680 bar. This is sufficient to bend quite thick pipes (diameter 30 mm) .
• the guide 14 is most preferably manufactured from aluminium profile, which as a unified structure is strong and torsionally rigid.
• the number of components is small, as is the unit weight.
• the operating device is only integrated in the tool to a small extent.
• the end of the slide forms directly the piston of the hydraulic cylinder, in which case the oil chamber moves to the present location of the piston rod 18, compared to the situation in Figures 4a and 4b.
• This intermediate part can be installed in its own groove.
• the tool can be substantially shortened by means of such a construction.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=36950718

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (6)

Family Cites Families (6)

• 2006
  • 2006-08-31 FI FI20065538A patent/FI20065538L/fi unknown
• 2007
  • 2007-08-31 WO PCT/FI2007/050467 patent/WO2008025884A1/en active Application Filing
  • 2007-08-31 EP EP07803730.6A patent/EP2056978A4/en not_active Withdrawn

Patent Citations (6)

Non-Patent Citations (1)

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