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
  • 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
  • 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
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/065—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes starting from a specific blank, e.g. tailored blank
• • 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

Definitions

• the Drfincung applies to a process for reshaping a - initial prof. 3 or the like.
• Workpiece by means of an In ⁇ e- .och ⁇ ruckes generated in the sealed profile space by a currentable active medium to form an end profile, in particular for. iforren c_s for placing the end profile on the wall 10 of a wall.
• the invention captures a profile with at least one profile and a limited profile space as a standard profile for carrying out this method.
• an internal roll profile is expanded by internal pressure.
• the hollow profile can be pushed and widened, compressed, or compressed by means of at least one stamp acting on the workpiece. expanded.
• 20 DE 35 32 -99 Cl is an example of a device for - Apply a pipe section using a m aas?: n ⁇ insertable cone-like cylindrical probe, which m_ttels at least two spaced apart diameter with the pipe section to be widened-
• the Ausga ⁇ gsprofll m at a distance to its free ends and transverse to its longitudinal axis to a cross section with favorable bending properties, in particular a flat DZ ... approximately oval cross section.
• the starting profile is to be changed after the cross-sectional shaping this area be bent.
• An advantageous starting profile for the procedure according to the invention is of approximately H-shaped cross section with two approximately parallel and interconnected chambers. Their flank walls are supposed to be curved inwards in cross-section, whereas the inner boundaries of the chambers are formed by channel-like indentations.
• the inventor deliberately enforces folding or he flat prints the workpiece; if necessary, he designs extruded profiles already in the initial state as flat upright profiles in order to achieve a low flake moment of inertia in this way, so that correspondingly small plastic distortions result in the bending forging process. Only in the subsequent IHU process is the workpiece shaped to its final shape.
• the IHU process serves to shape the cross-section. This is less to simplify the technical effort involved in bending than to minimize the degree of deformation.
• the degree of deformation achieved is significantly reduced compared to a bending process according to a method taken from the Star.ce of technology. This means that with a classic bending technique, in which the bending process already strives to achieve a cross-sectional contour that is as close as possible to the desired end result, favorable results can only be obtained in exceptional cases m in relation to the accurately corrected plastic distortions at the end of the entire process sequence achieve.
• the lower degree of deformation in the subsequent hydroforming process means that a higher residual forming capacity is available.
• Fig. 1 an oblique view of a curved
• FIG. 11 an oblique view of a preliminary profile with the cross section of FIG. 10;
• Fig. 12 to 15 v ⁇ er sketches on the sequence of the Ausfor ⁇ formation of the square profile.
• the width b of 80 mm and the Queritessnohe h mm of 50 is during a gear with Biegevor ⁇ an attire ⁇ em hydroforming process, a - at right angles to one another extending tube sections llq. 11t-removing elbow 11 with an inner bending radius R_ of 200 mm.
• the 2 ois 5 illustrate the bending of a tubular profile 10 a round cross-section to an elbow ll a with a Krümungs ⁇ '_nkel q of 90 °; in the course of this method, that tube profile 10 a is inserted between two roller-like tools 12, 12 r in such a way that it is tangent to a tool 12 of this pair of tools somewhat outside its long center, after which the other tool _2 r acts as a counter-tool in the closing direction x translat-sch the pipe profile 10 a is brought up.
• the bewegcare tool 12 now begins a r rotaviruses tions ⁇ ch _ n gy its way to the stationary die 12 and receives daDe_ the top in Figures 2 to 4 tube section ll with q from ⁇ er longitudinal axis A of the tubular profile 10 a. -
• the Darste_lung of Fig. 5 reveals that the genes tube profile 10, during the bending process in the contact area has been dented to the standing tool 12.
• This deformed area G determines with the end edges 13 of the tubular profile 10 ⁇ or the elbow ll ⁇ distances e, ei. Its vertical line is marked with M.
• D profile section 14 in the initial state according to FIG. 5 has the local radius of curvature R ⁇ and is bent into the final state 14 a according to FIG. 3 such that the radius of curvature R mB is established in this final state; the two radii of curvature R ⁇ and R mB each refer to the bend-neutral fiber of the cross section.
• l zA , l B are the lengths before and after the bending process, wi the angle which the pipe or profiled section 14 includes before bending, and w 2 the angle included after bending by the profile section 12 a .
• W2RmB WlRmA
• Equations (1) to (3) can be used to estimate the expansions occurring in a tube or profile 14 - including the maximum expansions - in the case of bending deformation under the given conditions.
• a tubular profile 15, indicated cylindrically in cross section, of diameter d of 80 mm and a wall thickness t of 2 mm is to be bent before an IHU process in such a way that an inner bending radius R of 200 mm results.
• the maximum elongation at the outer radius can be estimated according to equation (3) above.
• the cross-section of the ring is deformed before the bending process in such a way that an elliptical cross-section of height I of 112 mm and width n of 48 mm approximates with the main axes indicated at Ii and Q. results.
• the cross-sectional area of the elliptical profile 15 a from here 251.30 mm remains the same as that of the circular tube or tubular profile 15.
• the posed or folded pre-profile 16 of the height i ⁇ of 50 mm and the width n x of 48 mm is - as I said - cross-sectionally H-shaped with two lw parallel vertical chambers 18, the outer flank walls 20 of which are curved inwards to the horizontal main axis Q.
• the inner chamber walls 22 are sections of bead-like deformations 24 of the bottom wall 26 and the ridge wall 28 of the preliminary profile 16.
• the distance s between the deepest of the two deformations 24 corresponds to approximately one sixth of the profile height i ⁇ .
• the pre-profile 16 produced by extrusion is inserted the tool 32 consisting of lower tool or base part 30 and upper tool or cover part 36. This only outlines the contours of the tool surface of the lower tool 32 with bottom wall 33 and side wall 34 and of the upper tool 36 which are relevant for the forming process.
• FIG. 13 shows the step of widening the preliminary profile 16 by means of a pressure medium flowing into its interior 19.
• the preliminary profile 16 of the bottom wall 33 and the side walls 34 of the lower tool 32 and the upper tool 36 which is stored in the tool space 38, lies against the inside.
• the expansion of the bottom wall 26 and ridge wall 28 is quite slight; the preliminary section 16 unfolds through pressure medium flowing into its interior 19 - almost corresponding to an accordion - and in this way fills the tool space 38.
• the walls 20, 26, 28 of the profile 16 are not stretched until the end of the unfolding process when the tool space 38 is formed.
• the square tube 10 or angle piece 11 produced in the tool 30 in the manner described is then removed from the tool space 38 (FIG. 15).

Applications Claiming Priority (3)

Publications (2)

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• 1999
  • 1999-11-18 DE DE19955694A patent/DE19955694A1/de not_active Withdrawn
• 2000
  • 2000-11-08 WO PCT/CH2000/000594 patent/WO2001036121A2/fr active IP Right Grant
  • 2000-11-08 ES ES00971201T patent/ES2203523T3/es not_active Expired - Lifetime
  • 2000-11-08 EP EP20000971201 patent/EP1233837B1/fr not_active Expired - Lifetime
  • 2000-11-08 CA CA002391444A patent/CA2391444A1/fr not_active Abandoned
  • 2000-11-08 US US10/130,730 patent/US6810705B1/en not_active Expired - Fee Related
  • 2000-11-08 DE DE50003146T patent/DE50003146D1/de not_active Expired - Fee Related
  • 2000-11-08 AT AT00971201T patent/ATE246059T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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