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EP0849012A1 - Procédé et dispositif pour produire des troux sur la périsphère des profilés creux - Google Patents

Procédé et dispositif pour produire des troux sur la périsphère des profilés creux Download PDF

Info

Publication number
EP0849012A1
EP0849012A1 EP97119523A EP97119523A EP0849012A1 EP 0849012 A1 EP0849012 A1 EP 0849012A1 EP 97119523 A EP97119523 A EP 97119523A EP 97119523 A EP97119523 A EP 97119523A EP 0849012 A1 EP0849012 A1 EP 0849012A1
Authority
EP
European Patent Office
Prior art keywords
hollow profile
stamp
wall
punch
hollow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97119523A
Other languages
German (de)
English (en)
Inventor
Ulrich Haag
Uwe Hardtke
Thomas Hülsberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
Daimler Benz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Publication of EP0849012A1 publication Critical patent/EP0849012A1/fr
Withdrawn legal-status Critical Current

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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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
    • 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
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • 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
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0596—Cutting wall of hollow work
    • 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
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/209—Including means to replace product in base material after cutting
    • 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
    • Y10T83/00—Cutting
    • Y10T83/384—By tool inside hollow work
    • Y10T83/395—One tool having only rectilinear motion[s]

Definitions

  • the invention relates to a method for producing holes on the circumference of a hydroforming tool located hollow profile according to the preamble of the claim 1 and a device for producing these holes according to the preamble of claim 10.
  • a generic method or a generic device is known from DE 195 06 067 C1.
  • the wall one inserted into a hydroforming tool Hollow profile from a stamp integrated in the forming tool from the outside against an internal pressure in the hollow profile, which is less than that for forming a hollow blank is customary forming pressure by means of hydroforming.
  • the plate-shaped flat stamp penetrates the wall of the hollow profile, the displaced flowable profile material essentially on the inside of the hollow profile piles up evenly.
  • the stamp thus becomes an indentation of the hollow profile, the edge of the embossed edge or, the circumference of the stamp is formed. This is done a work hardening of the hollow profile material, after which when withdrawn of the stamp from the now increasing internal pressure is pushed out again.
  • the one on the stamp page trained edge of the indentation forms a the shear edge of the hollow profile material for the one surrounded by it Bottom of the indentation. This will place the shear edge in place a circumferential predetermined breaking point for the hollow profile is formed, so that the separation process of the said floor or the later Punching holes before actually cutting them out the one on the edge of the guide hole of the punch on the die trained cutting edge begins. The cutting out will therefore by the preceding separation process on a defined one Spot relieved.
  • the hollow profile wall in the area of the future hole edge falls inwards due to the lower internal high pressure compared to a forming pressure due to the stamping.
  • the indentation is pressed out to a certain extent by the increasing internal pressure in the hollow profile, but after the hole has been created, there are still larger radii of incidence, which in various applications, for example due to the lower distribution possibility of the Hertz pressure and the smaller contact surface when attaching attachments to the hollow profile, are to a considerable extent undesirable.
  • recalibration of the hollow profile by means of a forming pressure would be necessary.
  • the cutting edge becomes dull after a certain operating time of the tool due to the multiple loading of hollow profiles in mass production, so that the cutting edge must be checked for maintenance on the one hand at maintenance intervals, and on the other hand must be reground if the blunting is not permitted.
  • the maintenance effort is considerable and expensive, and the forming tool, which is anyway costly to manufacture, becomes unusable after some time due to excessive wear due to several previous grinding operations.
  • the hole diameter inevitably becomes larger, which is undesirable in the case of tight tolerance specifications during manufacture and which significantly impairs the guidance of the pressurizing stamp. The latter leads to a production of the predetermined breaking point which is uneven from hollow profile to hollow profile, which has an adverse effect on the quality and the exact reproducibility of the hole production.
  • the invention has for its object a generic To further develop a method and a generic device, that within the hydroforming tool process reliability in a simple manner on the circumference of hollow profiles long service life of the device, holes can be generated, the shape of the outer circumference of the with a hole provided hollow profile remains.
  • the task is according to the invention by the features of the claim 1 regarding the procedure and the characteristics of claim 10 solved with respect to the device.
  • a predetermined breaking point in the form of a Thin point created, which is dimensioned such that when retracting the stamp the hollow profile material surrounded by the thin point, So the perforated slug in a simple way corresponding to the forming pressure in hydroforming High pressure driven is torn out.
  • the hydroforming tool carries the separation process of the perforated slug not and is therefore in front of a damage caused by the hollow profile on the edge the guide bore of the punch is spared, which reduces the service life the tool is not restricted.
  • Process reliability is increased because the guide bore of the Stamp with regard to wear on the transition into the engraving Edge edge remains unaffected and there are therefore no deviations in the formation of the predetermined breaking point.
  • the production the hole is almost tolerance-free and exactly true to size reproducible. Only the stamp is subject to wear, which, however, is low, since it is only in the hollow profile penetrate and do not have to cut through it. In addition, the Stamp easily exchangeable.
  • FIG. 1 shows a two-part internal high-pressure forming tool 1 shown, which consists of an upper tool 2 and a lower tool 3 consists of the two halves of the tool 1 form.
  • the dividing surface 21 of the upper and lower tools 2,3 is aligned horizontally.
  • trained engraving 4 is a tubular hollow profile 5 used with a circular cross section.
  • the hollow profile can also 5 be bent one or more times over its length.
  • a machined guide hole 6 incorporated, which is aligned radially to the engraving 4 and in this flows out.
  • a cutting punch 7 is in the guide bore 6 slidably guided.
  • the cutting punch 7 lies with little Play on the wall of the guide hole 6, wherein this and / or the circumference of the stamp to reduce wear and to reduce friction between the two friction partners Stamp 7 and guide bore wall with a wear protection layer can be provided, the sliding properties of the stamp 7 in the guide bore 6 increased.
  • the pilot hole 6 can also be located at other angles and does not have to forcibly aligned radially. The radial alignment is however for a simple design of the stamp 7 at one tubular hollow profile 5 cheap.
  • the stamp 7 is cylindrical with a circular cross section educated. On its face 8 facing the engraving 4 the stamp 7 has one with the outside 34 with the circumference of the stamp 7 aligned cutting edge 9, which in the 1 apparent non-use position of the stamp 7th abuts continuously on the outside 10 of the hollow profile 5 and ends flush with the engraving 4.
  • the ring cutter 9 delimits a trough 11, the bottom of which is from the end face 8 is formed. The trough 11 and at the same time the The shape of the end face 8 is such that the wall piece of the hollow profile later acted upon by the stamp 7 5 can be incorporated almost entirely.
  • the punch 7 has an axial bore 12 in which a plunger 13 is performed with little play.
  • the plunger 13 is through a retaining bolt 14 secured in a transverse bore 15 of the Stamp 7 is pressed.
  • the plunger 13 has an axially extending slot 16, whose ends 17, 18 form the stops on the retaining bolt 14.
  • Of the Tappet 13 is on the rear side 19 of a compression spring 20th supported or is driven by this towards the engraving.
  • the Support and the drive of the plunger 13 can, however, also hydraulically, pneumatically or mechanically by a slide member respectively.
  • the plunger 13 is also with its end face 35 in the non-use position of the stamp 7 on the hollow profile 5 on, the end 18 of the elongated hole 16 abutting the retaining bolt 14. At this stage there is pressure in the hollow section 5, which is less than a pressure that the hollow profile 5 to the outside would expand, e.g. atmospheric pressure.
  • the hollow profile 5 begins in the trough 11 of the still in Expand the non-use position of the stamp 7 (Fig. 2).
  • the plunger 13 becomes its other stop, thus against its slot end 17 against the retaining bolt 14 against shifted the force of the compression spring 20, which in a biased Condition passes.
  • the plunger 13 acts as it were as a counterhold, as he did from the formation of T-pieces is known by hydroforming. It forms a bump 22 on the hollow profile 5, while the flow of the hollow profile material into the depression 11 in the edge region 23 the guide hole 6 at the transition to the engraving 4 by pulling the Material is thinned over the guide hole edge.
  • the End face 35 of the plunger 13 then forms in its non-use position together with the face 8 of the stamp 7 the reason of the expansion trough 11.
  • the stamp 7 is engraved towards the 4 undiminished high internal high pressure by means of a high pressure generating hydraulics acting as drive means shifted until the Ring cutting edge 9 in the hollow profile wall 24 in the form of a piercing cuts.
  • the incision leaves a thin area 25 arise in the hollow profile wall 24, at the same time the Bump 22 of the future hole 26 by the stamp movement something in the direction of the interior 27 of the hollow section 5 is pushed back (Fig. 3).
  • the creation of the thin point 25 is due to the previous thinning of the hollow profile material supported in the edge area 23 by the expansion of the hollow profile 5, the incision then only with a lower penetration depth must be done as the incision without previous Thinning out.
  • the ring cutter 9 is also in terms of their wear and tear somewhat spared.
  • the stamp 7 is struck or suddenly pulled back into the non-use position, whereupon the thin area 25 tears all around.
  • the wall thickness of the Thin point 25 is dimensioned or so unstable that the slug 26 easily from the hollow profile wall 24 is torn out. Because of the clean cut through the Ring cutting edge 9 is the edge 28 of the hole 29 created to the outside 10 of the hollow profile 5 flat and sharp-edged.
  • the Outside 10 remains due to the constant pressure of the internal high pressure undeformed on the engraving 4 also in the area of the hole edge 28, so that the shape of the hollow profile 5 after the Perforation is preserved.
  • stamp 7 By jerkily reversing the Stamp 7 is advantageously the inertia of the Hole slug 26 still located in the hollow profile wall 24 and the short time between the outside 10 of the hollow section 5 and the resulting vacuum 7 used for tearing, so that the slug 26 also suddenly - without contact to own stamp 7 - just by applying the high pressure is ripped out.
  • the depth of penetration of the stamp 7 with its cutting edge 9 in the hollow profile wall 24 for each hole 29 to be created individually, so that for the generation after the penetration of the stamp 7 on the cross-sectional area of the hole 29 matched Forms thin point 25.
  • the wall 24 of the hollow profile 5 for Production of a hole 29 with a smaller cross-sectional area is weakened more than to make a hole 29 larger cross-sectional area.
  • the determination or the Voting is designed so that the holes 29 are practical arise simultaneously. With certain holes 29 is the separation the slug 26 did not happen completely, at the most, they are still attached to a thin wall thread 30 (Fig.
  • the stamp 7 can in the non-use position in such a way Guide hole 6 may be arranged that of the hollow profile wall 24 separate slugs 26 only partially the hollow profile 5 can leave.
  • the slug 26 is about 3/10 - 5/10 of the wall thickness of the hollow profile wall 24 still in Hole 29.
  • the process of separating the slug 26 from the hollow profile wall 24 is now complete. After that, the internal high pressure preferably within the hollow profile interior 27 lowered to atmospheric pressure, after which the plunger 13 on the Hole slug 26 is moved. This is entirely from the plunger 13 pressed back into the hole 29 so that a protrusion of the Punched hole 26 avoided on the outside 10 of the hollow profile 5 becomes. Due to the material springback of the perforated Hollow profile 5 at the hole edge 28 is always ensured that the slug 26 is clamped in the hole 29.
  • the forming tool 1 is then opened at atmospheric pressure, after which the hollow profile 5 can be removed.
  • the slug 26 can now be used a simple device conventional from the hollow profile 5 are pushed out without causing deformation of the hollow profile 5 comes in the area of the hole edge 28.
  • the pushing out can, for example, during the test process at Quality inspection are carried out, in which in the hollow section 5 insertable device slidable pins arranged are used to control the perforations with the perforated slugs 26 be pushed out through the holes 29.
  • a stamp 36 can be used be the 8 on its face instead of the ring cutter 9 has an annular wall 31 as penetrant, which is rectangular in cross section and with its outside 32 is flush with the circumference of the stamp, as shown in Fig. 5 can be seen.
  • the stamp 36 is already in Position of use, being driven by a high pressure generator Hydraulics - by means of the annular wall 31 in the hollow profile wall 24 has penetrated and through the embossing a forming the thin point 25, according to the shape of the Wall 32 creates circumferential wall weakening.
  • the holes 29 can be produced both in the case of hollow profiles 5, which were made in other tools as well take place with hollow sections 5, which first by hydroforming from a hollow inserted in the forming tool 1 Blank and then calibrated.
  • the Hollow section 5 can be made of assembled, preferably welded Half shells or extruded profiles exist.
  • the holes 29 can also be produced by that the hollow profile 5 after insertion into the forming tool 1 is expanded by internal high pressure and the expanding Hollow profile 5 a protruding into the engraving 4 of the forming tool 1 stamp 7 or 36 supported on the back, whereby the thin point 25 of the hollow profile wall 24 is trained. After the expansion is complete, the Stamp 7, or 36 withdrawn, after which the thin section 25 under Influence of the internal high pressure tears and the resulting one Punch 26 is torn outwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Punching Or Piercing (AREA)
  • Forging (AREA)
EP97119523A 1996-11-20 1997-11-07 Procédé et dispositif pour produire des troux sur la périsphère des profilés creux Withdrawn EP0849012A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19647963A DE19647963C2 (de) 1996-11-20 1996-11-20 Verfahren und Vorrichtung zur Herstellung von Löchern am Umfang von Hohlprofilen
DE19647963 1996-11-20

Publications (1)

Publication Number Publication Date
EP0849012A1 true EP0849012A1 (fr) 1998-06-24

Family

ID=7812203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97119523A Withdrawn EP0849012A1 (fr) 1996-11-20 1997-11-07 Procédé et dispositif pour produire des troux sur la périsphère des profilés creux

Country Status (3)

Country Link
US (2) US6484551B1 (fr)
EP (1) EP0849012A1 (fr)
DE (1) DE19647963C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067830A (en) * 1999-07-28 2000-05-30 Ti Corporate Services Limited Method and apparatus for forming opposing holes in a side wall of a tubular workpiece
EP1004381A3 (fr) * 1998-11-23 2001-04-18 General Motors Corporation Procédé et dispositif de formage et coupage par pression interne
WO2005068102A1 (fr) * 2004-01-16 2005-07-28 Daimlerchrysler Ag Dispositif et procede pour produire un profile en coque et un profile creux au moyen de moulage par haute pression interne
WO2021190967A1 (fr) * 2020-03-27 2021-09-30 Man Truck & Bus Se Structure de support pour véhicule automobile, en particulier pour porter des éléments de ressort et/ou d'amortissement

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19647963C2 (de) * 1996-11-20 1998-11-26 Daimler Benz Ag Verfahren und Vorrichtung zur Herstellung von Löchern am Umfang von Hohlprofilen
DE19909929C2 (de) * 1999-03-06 2003-03-27 Audi Ag Verfahren zum Innenhochdruck-Umformen eines Hohlprofiles mit angeformtem Steg sowie Vorrichtung zur Durchführung des Verfahrens
DE10344706B4 (de) * 2003-09-26 2005-10-13 Daimlerchrysler Ag Verfahren zum Trennen eines Hohlprofils
US6931901B2 (en) * 2003-10-21 2005-08-23 General Motors Corporation Method and apparatus for forming a threaded hole in a hydroformed part
DE10350151B4 (de) * 2003-10-28 2005-10-13 Daimlerchrysler Ag Werkzeug und Innenhochdruck-Umformen eines Hohlprofils sowie Verfahren zum Umformen eines Hohlprofils
DE10350156B3 (de) * 2003-10-28 2004-10-14 Daimlerchrysler Ag Werkzeug und Verfahren zum Schneiden eines Hohlprofils
US20050156004A1 (en) * 2003-12-22 2005-07-21 Edwards Mark S. Method and apparatus for fracturing seal rings
US6990879B2 (en) * 2003-12-29 2006-01-31 Rubino Daniel L Drain line re-perforator device
US6915672B1 (en) * 2004-03-12 2005-07-12 General Motors Corporation Hydrotapping power unit
US7249480B2 (en) * 2004-09-24 2007-07-31 General Motors Corporation In-die hydropiercing device for piercing holes in hydroformed parts
US7104099B1 (en) * 2005-08-16 2006-09-12 Gm Global Technology Operations, Inc. Center support punch assembly for hydroforming die
US7127924B1 (en) * 2005-09-09 2006-10-31 Gm Global Technology Operations, Inc. Double action punch assembly for hydroforming die
CN101326022B (zh) * 2005-10-20 2013-01-09 麦格纳国际公司 用于液压冲孔的组合冲头
DE102006007224A1 (de) * 2006-02-15 2007-08-16 Sitech Sitztechnik Gmbh Verfahren und Vorrichtung zum Herstellen eines Ausschnittes oder Durchbruchs in der Wandung eines nach dem Innenhochdruck-Umformverfahren ausgebildeten Bauteils
US7204113B1 (en) * 2006-09-29 2007-04-17 Gm Global Technology Operations, Inc. Punch for hydroforming die
TWI351325B (en) * 2008-12-09 2011-11-01 Metal Ind Res & Dev Ct Device for producing patterns and a method thereof
CN112605249A (zh) * 2020-12-30 2021-04-06 广西双英集团股份有限公司 高强度钢汽车座椅侧板冷冲压回弹和开裂控制方法

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DE4322063C1 (de) * 1993-07-02 1994-08-18 Schaefer Maschbau Wilhelm Verfahren und Vorrichtung zum Ausschneiden eines Ausschnittes aus einer Wandung eines nach dem Innhochdruck-Umformverfahren hergestellten Hohlkörpers
DE19506067C1 (de) * 1995-02-22 1996-06-20 Krupp Ag Hoesch Krupp Verfahren zum Ausschneiden eines Ausschnitts aus der Wandung eines als Hohlkörper ausgebildeten Bauteils und Vorrichtung zur Durchführung des Verfahrens

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JPS55144334A (en) * 1979-04-27 1980-11-11 Nippon Baruji Kogyo Kk Liquid pressure bulging method
DE4322063C1 (de) * 1993-07-02 1994-08-18 Schaefer Maschbau Wilhelm Verfahren und Vorrichtung zum Ausschneiden eines Ausschnittes aus einer Wandung eines nach dem Innhochdruck-Umformverfahren hergestellten Hohlkörpers
DE19506067C1 (de) * 1995-02-22 1996-06-20 Krupp Ag Hoesch Krupp Verfahren zum Ausschneiden eines Ausschnitts aus der Wandung eines als Hohlkörper ausgebildeten Bauteils und Vorrichtung zur Durchführung des Verfahrens

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1004381A3 (fr) * 1998-11-23 2001-04-18 General Motors Corporation Procédé et dispositif de formage et coupage par pression interne
US6067830A (en) * 1999-07-28 2000-05-30 Ti Corporate Services Limited Method and apparatus for forming opposing holes in a side wall of a tubular workpiece
WO2005068102A1 (fr) * 2004-01-16 2005-07-28 Daimlerchrysler Ag Dispositif et procede pour produire un profile en coque et un profile creux au moyen de moulage par haute pression interne
WO2021190967A1 (fr) * 2020-03-27 2021-09-30 Man Truck & Bus Se Structure de support pour véhicule automobile, en particulier pour porter des éléments de ressort et/ou d'amortissement

Also Published As

Publication number Publication date
DE19647963A1 (de) 1998-05-28
US20020174698A1 (en) 2002-11-28
DE19647963C2 (de) 1998-11-26
US6484551B1 (en) 2002-11-26
US6681611B2 (en) 2004-01-27

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