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EP1702695B1 - Méthode de production d'une partie de transition dans un profilé creux - Google Patents

Méthode de production d'une partie de transition dans un profilé creux Download PDF

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Publication number
EP1702695B1
EP1702695B1 EP06005275A EP06005275A EP1702695B1 EP 1702695 B1 EP1702695 B1 EP 1702695B1 EP 06005275 A EP06005275 A EP 06005275A EP 06005275 A EP06005275 A EP 06005275A EP 1702695 B1 EP1702695 B1 EP 1702695B1
Authority
EP
European Patent Office
Prior art keywords
wall thickness
section
transition
hollow form
diameter
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.)
Not-in-force
Application number
EP06005275A
Other languages
German (de)
English (en)
Other versions
EP1702695A3 (fr
EP1702695A2 (fr
Inventor
Eberhard Dr.-Ing. Rauschnabel
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.)
Ifutec Ingenieurbuero fur Umformtechnik GmbH
Original Assignee
Ifutec Ingenieurbuero fur Umformtechnik GmbH
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 Ifutec Ingenieurbuero fur Umformtechnik GmbH filed Critical Ifutec Ingenieurbuero fur Umformtechnik GmbH
Publication of EP1702695A2 publication Critical patent/EP1702695A2/fr
Publication of EP1702695A3 publication Critical patent/EP1702695A3/fr
Application granted granted Critical
Publication of EP1702695B1 publication Critical patent/EP1702695B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/02—Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded

Definitions

  • the present invention relates to a method for forming a hollow molded part, wherein in a forming area by means of a plastic material forming a transition is formed such that on the hollow mold part, a first portion with a larger transverse extent, in particular a larger diameter, and a second portion with a smaller Transverse extension, in particular a smaller diameter, are formed.
  • the object is to avoid a resulting after a plastic deformation of a hollow molded part wall thickness reduction in the range of a generated transition or eliminate it with the simplest possible means preventive.
  • a wall thickening is produced on the hollow shaped part in a forming area by means of a plastic material deformation, in particular by a warm and / or warm forging method.
  • a transition from a first section with a larger transverse extent to a second section with a smaller transverse extent is formed in the forming area by means of a plastic material deformation, wherein the forming area lies at least partially between the first section and the second section and the transition in particular completely includes.
  • the transition is positioned within the forming area, which includes the wall thickening, so that more material is available to the plastic material forming to produce the transition. This can ultimately be achieved in the finished part of greater wall thicknesses in the transition area and / or steeper transitions and / or higher (permanent) strength.
  • the forming area overlaps in the axial direction with the first section and / or with the second section.
  • larger wall thicknesses are made available to the first and / or the second section, in each case near the transition, which are available for subsequent, optionally material-converting, processing steps.
  • there is a further increased strength in the vicinity of the transition which also allows abrupt and / or erratic or discontinuous cross-sectional changes while still providing sufficient stability.
  • the second section is arranged in the axial direction on the end side on the hollow mold part, and the forming area comprises the second section completely.
  • the forming area includes both the second section and the transition area;
  • the forming area also overlaps with the first section, so that a lengthwise exact configuration of the forming area is less meaningful.
  • a section with a smaller wall thickness and a section with a greater wall thickness are formed in the first method step on the hollow molded part within the forming area.
  • the forming area has a continuous changing wall thickness, which may be adapted to the subsequent transition to be formed.
  • a wall thickness in the forming area after the first method step is greater than an initial wall thickness of the hollow molded part, wherein the wall thickness of the transition after the second method step is at least partially dimensioned approximately equal to the one output wall thickness of the hollow molded part.
  • the initial wall thickness of the hollow molded part preferably represents the smallest wall thickness of the finished part, so that in terms of sufficient (continuous) strength, the wall thickness of the transition should be sized accordingly. This is achieved by thickening in the first method step with subsequent wall thickness reduction in the second method step.
  • the wall thickness of the transition after the second method step is dimensioned in sections approximately equal to an initial wall thickness of the hollow molded part and partially larger than the one output wall thickness of the hollow molded part.
  • the hollow molded part is selected as a rotationally symmetrical tube with an approximately constant output wall thickness, wherein in the first process step in the forming area an outwardly extending and / or inwardly extending, circumferential wall thickening is generated.
  • the hollow molded part as a rotationally symmetrical tube with a chosen in the first process step in the forming area, a circumferential wall thickening with a diameter which is greater than the initial diameter.
  • the initial diameter can subsequently be restored.
  • the diameter of the transition after the second method step is dimensioned in sections larger than the starting diameter of the hollow molding. In this way, an annular bead can additionally be produced on the outside of the tube, which is available for subsequent method steps.
  • an inner diameter of the transition after the second method step is dimensioned smaller in sections than an initial inner diameter of the hollow molded part.
  • the present invention relates to a method for forming a hollow molded part 1.
  • the hollow molded part 1 is designed as a circular cylindrical tubular element preferably made of an aluminum or steel alloy having an outer diameter D1 and a wall thickness t1.
  • a wall thickening V is produced on the hollow shaped part 1 in a forming region U ( Fig. 1 ).
  • Three cooperative ones Matrices M1, M2 and M3 and two mandrels M4 and M5 are provided for the plastic deformation of the hollow molded part 1.
  • the hollow molded part is compressed in particular in the longitudinal direction, so that with the help of Querf thoroughlyvor saun the wall thickening V with a both outwardly and inwardly enlarged wall of the hollow molded part 1 results.
  • the matrices and mandrels are dimensioned and configured accordingly.
  • the matrix M2 provided for supporting the wall thickening V can be designed to be flexible and / or movable in the radial direction.
  • the matrix M2 can also be omitted.
  • a transition W is formed in the forming area U by means of a plastic material deformation such that a first section 1a with a larger diameter D1 and a second section 1b with a smaller diameter D2 are formed on the hollow shaped part 1.
  • the larger diameter D1 of the first section corresponds approximately to the starting diameter of the hollow molded part 1.
  • the wall thickness of the first section also corresponds to the output wall thickness t1.
  • the plastic deformation (drawing) is carried out in a conventional manner with the help of so-called drawing dies. Alternatively or additionally, methods such as rotary kneading, impact rolls, rolling, tumbling, etc. can be used.
  • the transition W is exemplified as a tapered portion between the first portion 1a and the second portion 1b, wherein a cone angle between 30 ° and 85 ° and a wall thickness t2, which is greater than the output wall thickness t1 provided.
  • This is achieved in that the transition W is arranged substantially within the previously formed forming region U, wherein the forming region thus also at least partially comes to rest between the first portion 1a and the second portion 1b.
  • the forming area U in the axial direction overlaps both the first portion 1a and the second portion 1b, as shown in FIG Fig. 2 is shown. Accordingly arise in the overlapping areas compared to the Wall thicknesses t1 and t2 significantly increased wall thicknesses, which in particular give a relation to the output diameter D1 enlarged overlap diameter D3.
  • a second embodiment of the method according to the invention is based on 3 and 4 represented and in principle carried out according to the first embodiment.
  • a hollow molded part 1 which is designed as a tubular element with an outer diameter D1 and a wall thickness t1, provided by transverse extrusion in a Umform Scheme U with an inwardly directed wall thickening V.
  • Correspondingly configured dies cause by upsetting a plastic deformation of the material of the starting molded part in such a way that a portion U1 with a smaller wall thickness and a portion U2 with a greater wall thickness are formed on the hollow shaped part 1 within the forming area U.
  • an inwardly directed circumferential bead having a continuously changing wall thickness is formed in the forming region U.
  • the cross-sectional profile has according to Fig. 3 a roughly triangular contour.
  • a transition W is formed in the forming area U by means of a plastic material deformation such that a first section 1a with a larger diameter D1 and a second section 1b with a smaller diameter D2 are formed on the hollow shaped part 1.
  • the larger diameter D1 of the first section corresponds approximately to the initial diameter of the hollow molded part 1.
  • the wall thickness of the first section corresponds to the output wall thickness t1 as well as the wall thickness t3 of the transition W.
  • the transition W is exemplified as a tapered section between the first section 1a and the second section 1b executed.
  • the transition W is positioned approximately in such a way that the section U2 having the greatest wall thickness present after the first method step lies approximately in the middle in the transition W.
  • a particularly steep transition W realize with a wall thickness, which is preferably slightly greater than or equal to the wall thicknesses of the first and the second section.
  • a third embodiment of the method according to the invention is based on FIGS. 5 and 6 illustrated and in principle perform according to the first embodiment.
  • a hollow molded part 1 which is designed as a tubular element with an outer diameter D1 and a wall thickness t1, provided by transverse extrusion in a Umform Scheme U with an inwardly and outwardly directed wall thickening V.
  • the wall thickening V is in this case formed with an approximately constant wall thickness at one end of the hollow molded part 1.
  • a transition W is formed in the forming area U by means of a plastic material deformation such that a first section 1a with a larger diameter D1 and a second, end section 1b with a smaller diameter D2 are formed on the hollow shaped part 1.
  • the second section 1b and the transition W are completely positioned within the deformation area U.
  • the wall thickness t2 is at least partially reduced in the region of the transition W, but the wall thickness t2 is even greater than the output wall thickness t1 executed.
  • the wall thickness t reached in the deformation area U after the second process step remains u. U. sections obtained in the second section 1b or is even increased.
  • the wall thickness in the second section 1b can be further reduced by stretching over a mandrel.
  • another shoulder can be produced in the second section analogous to the transition W in the same direction (by further retraction) or in opposite directions (by widening) another shoulder.
  • a fourth embodiment of the method according to the invention is based on FIGS. 7 and 8 illustrated and in principle perform according to the first embodiment.
  • a hollow mold part 1 which is designed as a tubular element with an outer diameter D1 and a wall thickness t1, provided by transverse extrusion in a Umform Scheme U with a substantially outwardly directed wall thickening V.
  • the wall thickening V is in this case carried out with approximately constant wall thickness t or with continuously changing wall thickness. It is preferred to produce a diameter D3 that is significantly larger than the initial diameter D1.
  • a transition W is formed in the forming area U by means of a plastic material deformation such that a first section 1a with a larger diameter D1 and a second, end section 1b with a smaller diameter D2 are formed on the hollow shaped part 1.
  • the enlarged diameter D3 and a wall thickness t2 increased in relation to the outlet wall thickness t1 remain approximately.
  • a wall thickness t3 is achieved which measures approximately equal to the initial wall thickness t1 and merges into the second section 1b in a sliding manner.
  • a fifth embodiment of the method according to the invention is based on FIGS. 9 and 10 illustrated and performed in principle according to the previous embodiments.
  • a hollow molded part 1 which is designed as a tubular element with an outer diameter D1 and a wall thickness t1
  • a correspondingly configured matrix M3 provided in cooperation with a mandrel M1, M2 causes said plastic deformation of the material of the starting molding in one step.
  • a first section U1 and a second section U2 are each formed with a larger wall thickness on the hollow molded part 1 within the forming area U, wherein the wall thickness increase in the sections U1, U2 is taken from a reduction in length of the same areas, but also the adjacent areas.
  • a plurality of conically extending transitions between the sections U1, U2 are formed in the forming area U.
  • the sections U1, U2 are formed in a plurality of separate cold, warm or semi-hot forming steps.
  • transitions W1, W2 are formed in the forming regions U1, U2 by means of one or more plastic material forming processes such that a first portion 1a with a larger diameter D2, a second portion 1b with a mean diameter D1 and a hollow portion 1 are formed on the hollow mold part 1 third section are formed with a smaller diameter D3.
  • the average diameter D1 of the second section 1b preferably corresponds approximately to the starting diameter of the hollow molded part 1.
  • the wall thickness of the second section 1b also corresponds to the starting wall thickness t1.
  • the wall thickness t2 of the second transition W2 is made larger than the output wall thickness t1.
  • the plastic deformation is carried out in a conventional manner, for example by means of known draw dies.
  • non-circular cross sections can also be provided in sections; in this case, corresponding maximum transverse extensions can be provided instead of the diameters D1, D2, D3.
  • the first transition W1 is exemplified as a tapered portion between the first portion 1a and the second portion 1b, wherein on the inside (and / or in a modified manner on the outside) on the hollow mold part, an annular thickening N can be provided.
  • the first transition W1 is positioned approximately in the same axial region in which the forming section U1 with the inwardly directed thickening V1 is provided in the first method step.
  • a particularly steep transition W1 can be realized with a wall thickness which is preferably greater by 30% to 100%, possibly even 200%, than the wall thickness t1 of the second section 1b.
  • the second transition W2 is in turn embodied, for example, as a conical section between the third section 1c and the second section 1b, wherein the second transition W2 is positioned approximately completely in the axial direction in the region of the second forming section U2 with its outwardly directed wall thickening V2 or the second Forming section U2 in the axial direction at least overlaps.
  • the quantity of material required for at least part of the wall thickness of the second transition W2 is provided by the thickening V2 formed in the first method step, so that a sufficient wall thickness t2 results in the range of the second transition W2, which ranges between 0% and 40%. can be greater than the output wall thickness t1 if at least 75% of the second transition W2 are arranged in the axial direction in the region of the second forming section U2.
  • highly stressed shafts such as gear and drive shafts can be produced inexpensively.
  • machine elements e.g., gears or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Artificial Filaments (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Claims (10)

  1. Procédé de formage d'une pièce moulée creuse, dans lequel
    - dans une première étape de procédé, un épaississement de paroi (V) est généré sur la pièce moulée creuse (1) dans une zone de formage (U) par un formage de matière plastique, en particulier par un procédé de formage à chaud et/ou de formage à basse température,
    - dans une étape de procédé suivante, une transition (W) est formée dans la zone de formage par un formage de matière plastique de manière à ce que
    - sur la pièce moulée creuse sont formés une première section (1a) avec une extension transversale plus grande, en particulier un diamètre (D1) plus grand, ainsi qu'une deuxième section (1b) avec une extension transversale plus petite, en particulier un diamètre (D2) plus petit, étant donné que
    - la zone de formage (U) est située au moins partiellement entre la première section (1a) et la deuxième section (1b) et comprend au moins section par section la transition (W),
    caractérisé en ce que
    - la pièce moulée creuse est comprimée en particulier dans le sens longitudinal dans la première étape de procédé de manière à ce que
    - il en résulte dans la zone de formage (U) un épaississement de paroi (V) avec une paroi, agrandie aussi bien vers l'extérieur que vers l'intérieur, de la pièce moulée creuse (1).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la zone de formage (U) se chevauche dans le sens axial avec la première section (1a) et/ou la deuxième section (1b).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    la deuxième section (1b) est disposée dans le sens axial au bout sur la pièce moulée creuse (1) et en ce que la zone de formage (U) entoure entièrement la deuxième section (1b).
  4. Procédé selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    dans la première étape de procédé sont formés sur la pièce moulée creuse (1) au sein de la zone de formage (U) une section (U1a) avec une épaisseur de paroi plus petite et une section (U2) avec une épaisseur de paroi plus grande.
  5. Procédé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    une épaisseur de paroi dans la zone de formage (U) est, après la première étape de procédé, plus grande qu'une épaisseur de paroi initiale (t1) de la pièce moulée creuse, étant donné que l'épaisseur de paroi (t3) de la transition (W) après la deuxième étape de procédé a, au moins par section, environ la même grandeur que l'épaisseur de paroi initiale (t1) de la pièce moulée creuse (1).
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    l'épaisseur de paroi de la transition (W) a, après la deuxième étape de procédé, par section environ la même grandeur que l'épaisseur de paroi initiale (t1) de la pièce moulée creuse (1) et est par section plus grande que ladite épaisseur de paroi initiale (t1) de la pièce moulée creuse (1).
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    la pièce moulée creuse (1) est choisie comme tube à symétrie de révolution avec une épaisseur de paroi initiale (t1) presque constante, étant donné qu'est généré dans la première étape de procédé, dans la zone de formage, un épaississement de paroi (V) s'étendant vers l'extérieur et/ou vers l'intérieur.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la pièce moulée creuse (1) est choisie comme tube à symétrie de révolution avec un diamètre initial (D1) presque constant, étant donné qu'est généré dans la première étape de procédé, dans la zone de formage (U), un épaississement de paroi sur tout le pourtour avec un diamètre (D3) plus grand que le diamètre initial (D1).
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    le diamètre de la transition après la deuxième étape de procédé est par section plus grand que le diamètre initial de la pièce moulée creuse.
  10. Procédé selon l'une quelconque des revendications 7 à 9,
    caractérisé en ce que
    un diamètre intérieur de la transition après la deuxième étape de procédé est par section plus petit qu'un diamètre intérieur initial de la pièce moulée creuse.
EP06005275A 2005-03-16 2006-03-15 Méthode de production d'une partie de transition dans un profilé creux Not-in-force EP1702695B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005012475A DE102005012475A1 (de) 2005-03-16 2005-03-16 Verfahren zur Herstellung eines Übergangs an einem Hohlformteil

Publications (3)

Publication Number Publication Date
EP1702695A2 EP1702695A2 (fr) 2006-09-20
EP1702695A3 EP1702695A3 (fr) 2007-09-05
EP1702695B1 true EP1702695B1 (fr) 2009-12-23

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EP06005275A Not-in-force EP1702695B1 (fr) 2005-03-16 2006-03-15 Méthode de production d'une partie de transition dans un profilé creux

Country Status (3)

Country Link
EP (1) EP1702695B1 (fr)
AT (1) ATE452716T1 (fr)
DE (2) DE102005012475A1 (fr)

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DE102012110792A1 (de) 2012-11-09 2014-05-15 GFU-Gesellschaft für Umformung und Maschinenbau GmbH Umformverfahren zur Herstellung einer stufenförmigen Querschnittsverjüngung an einem rohrförmigen Werkstück aus Metall
US9987674B2 (en) 2012-07-13 2018-06-05 Gkn Land Systems Limited Manufacture of wheels
DE102018123316A1 (de) * 2018-09-21 2020-03-26 Benteler Steel/Tube Gmbh Rohrelement für Gasdruckbehälter, Gasdruckbehälter und Verfahren zur Herstellung eines Rohrelementes
WO2021180608A1 (fr) * 2020-03-11 2021-09-16 Thyssenkrupp Presta Ag Procédé de fabrication d'une partie d'arbre de direction d'un arbre de direction destiné à un véhicule à moteur, procédé de fabrication d'un arbre de direction destiné à un véhicule à moteur, partie d'arbre de direction d'un arbre de direction destiné à un véhicule à moteur, arbre de direction de véhicule à moteur et colonne de direction de véhicule à moteur

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DE102006060372A1 (de) 2006-12-20 2008-06-26 Cosma Engineering Europe Ag Werkstück und Verfahren für das Explosionsumformen
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9987674B2 (en) 2012-07-13 2018-06-05 Gkn Land Systems Limited Manufacture of wheels
DE102012110792A1 (de) 2012-11-09 2014-05-15 GFU-Gesellschaft für Umformung und Maschinenbau GmbH Umformverfahren zur Herstellung einer stufenförmigen Querschnittsverjüngung an einem rohrförmigen Werkstück aus Metall
DE102012110792B4 (de) * 2012-11-09 2016-12-01 GFU-Gesellschaft für Umformung und Maschinenbau GmbH Umformverfahren zur Herstellung einer stufenförmigen Querschnittsverjüngung an einem rohrförmigen Werkstück aus Metall
DE102018123316A1 (de) * 2018-09-21 2020-03-26 Benteler Steel/Tube Gmbh Rohrelement für Gasdruckbehälter, Gasdruckbehälter und Verfahren zur Herstellung eines Rohrelementes
DE102018123316B4 (de) 2018-09-21 2022-07-07 Benteler Steel/Tube Gmbh Rohrelement für Gasdruckbehälter, Gasdruckbehälter und Verfahren zur Herstellung eines Rohrelementes
WO2021180608A1 (fr) * 2020-03-11 2021-09-16 Thyssenkrupp Presta Ag Procédé de fabrication d'une partie d'arbre de direction d'un arbre de direction destiné à un véhicule à moteur, procédé de fabrication d'un arbre de direction destiné à un véhicule à moteur, partie d'arbre de direction d'un arbre de direction destiné à un véhicule à moteur, arbre de direction de véhicule à moteur et colonne de direction de véhicule à moteur

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DE502006005707D1 (de) 2010-02-04
EP1702695A3 (fr) 2007-09-05
DE102005012475A1 (de) 2006-09-21
EP1702695A2 (fr) 2006-09-20
ATE452716T1 (de) 2010-01-15

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