EP1250199B1 - Verfahren und umformwerkzeug zur zylinderrohrherstellung mittels fliesspressen - Google Patents
Verfahren und umformwerkzeug zur zylinderrohrherstellung mittels fliesspressen Download PDFInfo
- Publication number
- EP1250199B1 EP1250199B1 EP01909499A EP01909499A EP1250199B1 EP 1250199 B1 EP1250199 B1 EP 1250199B1 EP 01909499 A EP01909499 A EP 01909499A EP 01909499 A EP01909499 A EP 01909499A EP 1250199 B1 EP1250199 B1 EP 1250199B1
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- EP
- European Patent Office
- Prior art keywords
- mandrel
- blank
- forming tool
- drawing die
- tool according
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
- B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
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- 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
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
Definitions
- the invention relates to a method for the production of cylindrical tube under plastic Forming a hollow cylindrical blank by extrusion, the Cylinder tube is created.
- the blank is made into a substantially cylindrical one Drawing die inserted up to a stop.
- a drawing mandrel with a larger outer diameter than that Inner diameter of the blank moved through the cavity of the blank. This occurs due to the flow of blank material pressed by the mandrel Length increase of the tubular blank instead, and the wall of the blank is reduced in cross section.
- the invention further relates to an implementation of the process suitable forming tool with the hollow cylindrical die for receiving the pipe blank and the mandrel, which is by means of a mandrel bar is insertable into the blank.
- the mandrel is conical Outer wall section for realizing a drawing angle between the Provide the inner wall of the blank and the mandrel.
- From DE-PS 466434 is a method for the precise internal drawing of hollow bodies known about the type mentioned.
- An already preformed piece of pipe is inserted into a die for post-processing and over its upper, flipped edge between an upper part and a lower part of the die pinched and held.
- a pull rod which is approximately conical or wedge-like protruding pull rings, is through the pipe section in the die pushed through, the material of the inner wall of the pipe piece so distributed that not only the desired exact clear diameter for the Pipe piece is reached, but also a concentricity of the interior and Outside diameter, so a compensation of different wall thicknesses.
- the invention is based, with such an object Extrusion process a time-saving production of pipes with tight To allow tolerance dimensions and increased reliability.
- the inner diameter of the Drawing die and the outer diameter of the blank can each be selected so that there is radial play between the drawing die and the blank, and when moving the mandrel, the wall of the blank in radial Direction is pressed against the drawing die, the blank (also) with its outer diameter is expanded.
- the invention includes the procedural teaching that for The following process steps are carried out: First, a tube is inserted into an essentially cylindrical drawing die Tool housing up to a stop (on the start or bottom side) and with radial. Inserted play against the inner wall of the drawing die. Then a mandrel with a larger outer diameter than that Inner diameter of the tube blank from the opening side of the drawing die retracted into the tube. While driving the mandrel through whose outer diameter is the diameter of the tube both inside and widened outside in such a way that the blank material radially adjoins the Creates inner wall of the drawing die and the cross-sectional thickness of the Pipe blanks are reduced. This results in a blank length increase either counter to or in the direction of the mandrel feed direction, depending on whether forward or backward extrusion is effected.
- the Process limits due to the flow limit of the blank on its face Edition or the stop determined.
- the maximum allowable reduction in Cross-sectional area of the blank must be chosen so that it is Passing through the mandrel does not cause the material to flow on bottom stop or the front bearing surface comes, in particular when reverse extrusion is realized.
- the advantage of a time-saving Cylinder tube production achieved in just one working stroke.
- the method also gradually using of several mandrels with different outside diameters and to carry out appropriately adapted drawing dies. Because of the The process according to the invention is expedient for process limits mainly for the production of cylinder tubes of relatively short length. On Cutting to length - as in the case of pulling pipes discussed above - is not necessary so that the manufacturing time can be reduced. tries have shown that the cylinder tubes manufactured in this way have an envelope tolerance high quality - better than H9.
- the Auswerforgan can advantageously at the same time axial support of the blank during extrusion and stripping use.
- This additional, functional utilization of the ejection organ for Support in the bottom end area of the die results in backward extrusion and - associated with it - a corresponding one Increase in length.
- the cross-sectional expansion on the Blank end are formed in the direction of movement in the drawing die seen lying behind. Then the cross-sectional expansion can be used as a holding element Use in the beginning or entrance area of the drawing die by the blank hung on the drawing die over the cross-sectional extension and is supported. In this configuration, the increase in length can be over Reach forward extrusion within the die.
- the drawing die To make it easy to remove the tube from the Ensuring the drawing die is an inventive step expediently parallel to the movement stroke of the drawing mandrel or the mandrel rod movable ejector for the (completely formed) cylinder tube into the Forming tool integrated.
- the ejector can be - just like others Components of the forming tool such. B. mandrel - conveniently by means of Drive the hydraulic cylinder linearly, thereby integrating into the Overall tool is well practicable.
- the ejection organ in coordination with the respective position of the scraper at the entrance to the To control or operate the drawing die.
- One is in particular Overall control so useful that only after pressing the Scraper the approach of the ejector to the (fully formed) Cylinder tube is done.
- the tube blank is provided primarily to reverse extrusion enable.
- the sling means are mounted such that they can move shortly before the drawing mandrel is completely passed through the blank Lifting equipment due to a knocking or other action of the drawing mandrel Have it pressed radially outwards. This will completely pass the Drawing mandrel allows, so that post-processing of the (Finished) cylinder tube is avoided. At the same time.
- a taper has been particularly beneficial from the opening to the bottom side by an amount of 0.01 to 0.05 mm each 100 mm in length. This slight taper affects the Wall thickness, but the pulling process creates a parallelism or cylindricity the inner wall ensures that only the outer wall in 100th Area is conical. Due to the slightly conical design Drawing die flows the material in the forming process against the easier Pin direction in the optimal way in length. In other words, the one at the Cutting plane generated outer diameter constantly migrates to cutting planes larger die size, so that there is a slight loose.
- the drawing die with a working or pressing length of 10 is advantageous designed up to 500 mm. With this length, the average diameter of the (slightly conical) drawing die in coordination with the outside diameter of the Drawing mandrel for forming pipes from 2 to 4 mm wall thickness as cheap Process parameters. Other process parameters can also be used Consideration of individual influencing factors or boundary conditions realized become.
- the drawing angle is expediently formed on the order of 6 to 8 °, in order not only to effect the material flow on the inner wall of the blank, but also in the presence of radially displaceable outwards An optimal radial transverse force over this support bracket to be able to generate.
- the supporting effect of the lifting gear must not be prevented if a flow of blank material in the front Area to be avoided. Has proven to be particularly cheap in practice Drawing angle of 7 ° proved.
- Cylinder tube After passing the mandrel through the Blank or the cylinder tube is the rear end area on the Opening side of the drawing die by a subsequent expanding mandrel in the Diameter expanded.
- the expanding mandrel is located axially spaced behind or after the mandrel that is at the end of the mandrel bar is attached.
- a complementary shape is expedient in the interior the opening side of the drawing die, with which the expanding mandrel can interact.
- the forming tool for cylinder tube production consists of a steel tool housing in which a substantially cylindrical Drawing die 1 is integrated. This takes a tubular blank 3 as workpiece to be formed. Before the forming process, the blank 3 in the cylindrical drawing die 1 inserted, the diameter or Blank diameter is selected so that between blank 3 and the inner wall the drawing die 1 remains a radial play RS.
- the Blank 3 brought into contact with several bottom-side stop body 4. This are on the one hand between the drawing die 1 or an assigned drawing mandrel 6 and a bottom-side ejector 8 (see also FIG. 2).
- the examples shown are four in one quadrant of the tool circumference placed stop body 4a to 4d provided. They are radial in recesses Slidable in the tool housing in the transverse direction and over (not Drawn) spring means in the radially inwardly extended basic position held.
- the mandrel 6 is attached to the end of a mandrel rod 5. He is with a rotationally symmetrical, also towards the bottom ejector 8 tapered shape.
- the conicity angle is the above-mentioned drawing angle ⁇ forms 7 ° with respect to the tool central axis 1a or the inner wall of the blank 3.
- the mandrel rod 5 is linear to it Drive, for example, via hydraulic cylinders in an upper part of one not here fully illustrated press clamped.
- the tool housing is open attached to a press table (not shown).
- the mandrel 6 has a larger outer diameter than that Inner diameter of the blank 3 and is from the opening side of the Drawing die 2 inserted into blank 3.
- the diameter of the Blank 3 expanded from the inside.
- the blank wall is in reduced their cross-sectional thickness. Due to the mandrel 6 it happens radial application of material of the blank wall to the inner wall 2 the drawing die 1.
- the above radial play is due to the pressing action of the mandrel overcome.
- the scraper 7 can for example by means of several concentric to the central axis 1a of the tool Blocking body can be realized, the same to each other as the stop body 4a-4d are grouped according to FIG. 2.
- the individual will be useful Blocking body of the scraper 7 by a linear drive based on Pressure media (not shown) shifted radially inwards for actuation, see above that the (finished) cylinder tube with its rear face to the Bumpers of the stripping element 7 can hit and get caught.
- a respective bevel which is in relation to the bottom Ejector 8 is arranged so that the latter upon actuation by closing the bottom-set die opening hits the bevel 4f. there creates a radial force component, by means of which the or Stop body 4a-4d against spring pressure from their radially inner Starting position can be moved radially outwards.
- the second embodiment differs from the first 1 and 2 by an expanding mandrel 9, which on the mandrel rod 5th is additionally arranged downstream of the mandrel 6 with an axial distance.
- the axial Distance corresponds approximately to the length of the blank or (finished) cylinder tube 3.
- the working stroke for the mandrel rod 5 is set so that the expanding mandrel 9 in the upper or first opening area of the drawing die 2 onto the blank 3 acts, the (rear) end of which is widened, but only after the Drawing process by means of the upstream drawing mandrel 6 is completed.
- FIG. 4 differs from that of Figures 1-3 essentially in that lifting means in the bottom Opening area of the drawing die are not arranged or are not necessary. This is due to a modified design of the blank 3 on its bottom opening area of the drawing die 2 opposite end back. This is "sculpted" in cross-section, that is, with a cross-section Extension or protuberance 11 provided. Through this the face of the Blank 3 is displaced radially outward beforehand, so that the ejection element 8 additionally the function of a counter holder against the feed direction of the Drawing mandrel 6 can exercise during the flow process. The "tulip" or Putting out the tube is advisable before insertion into the drawing die 2 carried out. This has the advantage that additional components such as the abutment bodies mentioned above are no longer necessary.
- the forming tool shown in Figure 5 is essentially the same according to Figure 4. However, within the scope of the invention Procedure from that according to Figures 1-4: According to Figure 5 is (compared to Figure 4) the protuberance 11 seen on the opposite, in the feed direction rear end of the blank 3 formed.
- the protuberance 11, which is also in a previous manufacturing step outside the forming tool can be generated, is also used as a hanging device for receiving the axial Forming force used by the mandrel 6 during its Working strokes is generated.
- the entrance edge the drawing die 2 comprises.
- the Auswerforgan 8 no longer needs how according to Figure 4, as a counter-holder or support to ensure a backward extrusion to act but it will be solely for the actual Ejection function used.
- the design of the forming tool according to FIG. 6 is also based on the use of a tube blank 3 with the protuberance 11 at the rear end "Hang up” in the opening or entrance area of the drawing die 2 for the purpose Absorption of the axial forces of the mandrel 6 turned off.
- a retaining ring 12 is provided, which in the in Figure 6 shown position abuts the inner edge on the top of the drawing die 2 and is connected radially outside to a head plate 13.
- the retaining ring 12 and Head plate 13 are rigidly connected to each other, and this composite is in Frame of the forming tool arranged stationary or fixed.
- the drawing die 2 released and after be moved below, in the sense of being carried along by the mandrel 6 the drawing die 2 comprises on its outer jacket by a clamping ring 14 which with a guide piston 15 firmly connected on its upper or rear side is.
- a pressure plate 16 rigidly attached, which has a radially inwardly projecting section has. With this, the pressure plate 16 lies on the end face of a pressure tappet 17, which performs the function of a pressure pad (see below).
- the tube blank 3 is "sculpted" in an external work step means, for example, provided with the protuberance 11 by binding.
- an external work step means for example, provided with the protuberance 11 by binding.
- the press ram 19 drives the mandrel rod 5 and the mandrel 6 on End of the mandrel rod into the cavity of the blank 3. Because of its larger size The mandrel 6 widens the blank 3 from the inside, so that prevailing radial play RS between the outer wall of the Blank 3 and the inner wall of the drawing die 2 is eliminated.
- the Wall thickness of the blank 3 is quenched as it were. This creates Axial forces are applied over the radially inwardly projecting section of the Pressure plate 16 taken up by the plunger 17.
- the plunger 17 is for Responded to a preset pressure threshold and entered like Pressure cushion if this pressure threshold is exceeded.
- By an in A signal generated by a controller is used in the further course of the working stroke finally causes the plunger 17 to completely retract. Because a counter support by the pressure ram 17 is progressing Working stroke no longer required.
- the plunger pin 18 is directly on Press ram 19 attached and this is linear and axially parallel moved according to the working stroke.
- the tappet pin 18 passes through the Head plate 13 and presses on the drawing die 2 to its linear Shift.
- the guide piston 15 is firmly connected to it Clamping ring 14 and the pressure plate 16 also moved on the underside.
- the clamping ring surrounds the mandrel rod 5 concentric and lies on the cross-sectional or conically expanded mandrel 6 in the axial direction.
- the clamping ring has one on its outer jacket Taper 23 with which a counter-taper 24 on the inner surface of the Retaining rings 13 correspond complementarily. This will make an oblique Tool center axis 1a extending receiving ring gap for the protuberance 11 of the blank 3 formed.
- the compression spring 22 winds around the mandrel rod 5 and is supported on the one hand against the underside of the press ram 19. At the opposite end, the spring 22 enters an end recess of the Clamping ring 21, whereby this is pressed axially parallel to the mandrel 6.
- a radially directed is created Force component on the protuberance 11 of the blank 3, whereby this with a stronger clamping force is held. With increasing working stroke (see right Half of Figure 7) this clamping force is stronger because the press ram 19 Compression spring 22 compresses and thus increases the spring tension.
- the clamping ring 21 is expediently designed to be, for example, 0.05 mm smaller than the mandrel 6, so that the clamping ring 21 by the compression spring 22 securely is pushed open.
- the drawing die 2 is taken along by the tappet pin 18 As already described above, the holding force increases due to increased pressure of the spring 22 on the clamping ring 21st
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Extrusion Of Metal (AREA)
Description
- Figur 1
- ein Ausführungsbeispiel eines erfindungsgemäßen Umformwerkzeugs im Teil-Längsschnitt, wobei der Ziehdorn auf den Rohling einwirkt,
- Figur 2
- eine Schnittdarstellung gemäß Linie A-A in Figur 1,
- Figur 3
- ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Umformwerkzeugs im Teil-Längsschnitt analog zur Figur 1, allerdings mit zusätzlichern Aufweitdorn,
- Figur 4 - Figur 7
- Jeweils im analogen Teil-Längsschnitt weitere Ausführungsbeispiele erfindungsgemäßer Umformwerkzeuge,
- Figur 8
- eine Schnittdarstellung gemäß Linie B-B in Figur 7.
- 1
- Ziehmatrize
- 1a
- Mittelachse
- 2
- Ziehmatrize-Innenwandung
- 3
- Rohling
- 4
- Anschlag
- RS
- radiales Spiel
- 4a, 4b, 4c, 4d
- Anschlagkörper
- 5
- Dornstange
- 6
- Ziehdorn
- 7
- Abstreiforgan
- 7a, 7b
- Blockierkörper
- 8
- Auswerfer
- α
- Ziehwinkel
- 9
- Aufweitdorn
- 11
- Ausstülpung
- 12
- Haltering
- 12a
- konischer Innenmantel
- 13
- Kopfplatte
- 14
- Spannring
- 15
- Führungskolben
- 16
- Druckplatte
- 17
- Druckstößel
- 18, 18a, 18b, 18c, 18d
- Stößelbolzen
- 19
- Pressenstößel
- 20
- Führungsbuchse
- 21
- Klemmring
- 22
- Druckfeder
- 23
- Konizität
- 24
- Gegen-Konizität
Claims (25)
- Verfahren zur Zylinderrohrherstellung, mit plastischer Umformung eines hohlzylindrischen Rohr-Rohlings (3) durch Fließpressen zum Zylinderrohr, wozu der Rohling (3) in eine im wesentlichen zylindrische Ziehmatrize (1) bis zu einem Anschlag (4) eingebracht wird, und nachfolgend in der Ziehmatrize (2) ein Ziehdorn (6) mit größerem Außendurchmesser als der Innendurchmesser des Rohlings (3) durch den Hohlraum des Rohlings (3) durchbewegt wird, wobei aufgrund Fließens von vom Ziehdorn (6) gepreßtem Rohlingsmaterial ein Längenzuwachs des Rohlings (3) stattfindet, und die Wandung des Rohlings (3) im Querschnitt reduziert wind, wobei der Innendurchmesser der Ziehmatrize (1) und der Außendurchmesser des Rohlings (3) jeweils so gewählt werden, dass sich radiales Spiel (RS) zwischen der Ziehmatrize (1) und dem Rohling (3) ergibt, und beim Durchbewegen des Ziehdorns (6) die Wandung des Rohlings (3) in radialer Richtung gegen die Ziehmatrize (1) gedrückt wird, wobei der Rohling (3) mit seinem Außendurchmesser aufgeweitet wird, dadurch gekennzeichnet, dass am Ende des Umformvorgangs der Ziehdorn (6) in zur Durchbewegung entgegengesetzter Richtung zurückbewegt wird, und das auf dem Ziehdorn (6) bei dessen Rückbewegung mitgenommene Zylinderrohr vom Ziehdorn (6) abgestriffen wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während oder nach dem Pressen mittels des Ziehdorns (6) das dem Ziehdorn (6) als Eingang zugeordnete Ende des Rohlings (3) mit einem zweiten, zusätzlichen Dorn (9) aufgeweitet wird.
- Verfahren nach einem der vorangehenden Ansprüche, gekennzeichnet durch ein mehrmaliges Wiederholen der genannten Reihenfolge der Verfahrensschritte jeweils mit im Durchmesser größeren Ziehmatrizen (1) und Ziehdornen (6).
- Verfahren nach einem der vorangehenden Ansprüche, mit Verwendung eines Rohlings (3) mit einem vorab im Querschnitt erweiterten Endabschnitt (11) zum Zusammenwirken mit beziehungsweise zur Halterung an dem Anschlag (4) oder einer Endkante der Ziehmatrize (2), wobei mittels dem erweiterten Endabschnitt (11) der Rohling (3) an dem Anschlag (4) oder der Endkante aufgehangen oder dagegen abgestützt wird, dadurch gekennzeichnet, dass die Querschnittserweiterung mittels Bördeln vor dem Einbringen in die Ziehmatrize (2) erzeugt wird.
- Verfahren nach Anspruch 4 dadurch gekennzeichnet, dass der querschnittlich erweiterte Endabschnitt (11) an dem Ende des Rohlings (3) vorgeformt wird, das in Durchbewegungsrichtung hinten liegt, und mittels dieser Querschnittserweiterung (11) der Rohling (3) im Anfangsbeziehungsweise Eingangsbereich der Ziehmatrize (1) entgegen der Durchbewegungsrichtung gehalten wird, und mittels des durchfahrenden Ziehdorns (6) ein Vorwärtsfließpressen für das Rohlingsmaterial erzeugt erzeugt wird.
- Verfahren nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass nach erfolgtem Herausbewegen des Ziehdorns (6) die Erweiterung (11) im Endabschnitt beseitigt wird.
- Umformwerkzeug zur Durchführung des Zylinderrohr-Herstellungsverfahrens nach einem der vorangehenden Ansprüche, mit einer im wesentlichen hohlzylindrischen Matrize (1) zur Aufnahme eines Rohr-Rohlings (3) und einem darin mittels einer Dornstange (5) einführbaren und herausbewegbaren Ziehdorns (6), der einen konischen Außenwandungsabschnitt zur Realisierung eines Ziehwinkels (α) zwischen der Innenwandung des Rohlings (3) und dem Ziehdorn (6) aufweist, dadurch gekennzeichnet, dass im oder vor dem Eingangsbereich der Ziehmatrize (1) ein Abstreiforgan (7) zum Lösen des fertig umgeformten Zylinderrohres vom Ziehdorn (6) bei dessen Herausbewegen aus der Ziehmatrize (1) angeordnet ist.
- Umformwerkzeug nach Anspruch 7, dadurch gekennzeichnet, dass das Abstreiforgan (7) mittels eines oder mehrerer Blockierkörper (7a,7b) realisiert ist , der oder die von einer Ausgangsposition radial oder quer zur Bewegungsrichtung des Ziehdorns (6) in oder über die Eingangsöffnung der Ziehmatrize (1) soweit verfahrbar sind, dass dabei ein mit der Wandungsdicke des Zylinderrohrs kongruenter Randbereich der Eingangsöffnung abdeckbar ist.
- Umformwerkzeug nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass in einem Bodenbereich der Ziehmatrize (1) ein parallel zum oder entsprechend dem Bewegungshub des Ziehdorns (6) oder der Dornstange bewegbares Auswerforgan (8) für das Zylinderrohr angeordnet ist, und das Auswerforgan (8) in Koordination mit dem oder abhängig vom Abstreiforgan (7) oder Blockierkörper (7a,7b) derart ansteuerbar ist, dass seine Betätigung erst nach Betätigung des Abstreiforgans (7) erfolgt.
- Umformwerkzeug nach Anspruch 9, gekennzeichnet durch einen oder mehrere Anschlagkörper (4a-4d), die radial oder quer zur Bewegungsrichtung des Ziehdorns (6) in zumindest den Rand des Bodenbereichs der Ziehmatrize (1) einragen, um den Rohling (3) stirnseitig gegen eine vom Ziehdorn (6) ausgeübte Axialkraft zur Herbeiführung eines Rückwärts-Fließpressens von Rohlingsmaterial abzustützen.
- Umformwerkzeug nach Anspruch 10, dadurch gekennzeichnet, dass der oder die Anschlagkörper (4a-4d) zwischen dem Ziehdorn (6) und dem Auswerforgan (8) angeordnet und aus ihrer ausgefahrenen Grundposition gegen Federdruck durch den Ziehdorn (6) oder das Auswerforgan (8) quer zu deren Bewegungsrichtungen oder radial nach außen verschiebbar gelagert sind.
- Umformwerkzeug nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass die radial innen liegende Stirnseite des oder der Anschlagkörper (4a-4d) eine Abschrägung oder Konizität aufweist, die dem Auswerforgan (8) zugewandt oder zugeordnet ist.
- Umformwerkzeug nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, dass der Hohlraum der Ziehmatrize (1) sich vom Eingangs- beziehungsweise Öffnungsbereich zum dem Auswerforgan (8) benachbarten Bodenbereich hin in seinem Durchmesser verjüngt.
- Umformwerkzeug nach Anspruch 13, gekennzeichnet durch eine konische Verjüngung insbesondere um 0,01 bis 0,05 mm pro 100 mm Längeneinheit.
- Umformwerkzeug nach einem der Ansprüche 9 bis 14, gekennzeichnet durch einen Zehwinkel (α) von 6° bis 8°, vorzugsweise 7°.
- Umformwerkzeug nach einem der vorangehenden Ansprüche, gekennzeichnet durch einen dem Ziehdorn (6) an der Dornstange (5) axial nachgeordneten Aufweitdorn (9), dessen Abstand (10) vom Ziehdorn (6) mindestens etwa der Länge des zu bearbeitenden Rohr-Rohlings (3) entspricht.
- Umformwerkzeug nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die für die Bearbeitung des Rohlings (3) wirksame Länge der Ziehmatrize (2) 10 mm bis 500 mm beträgt.
- Umformwerkzeug nach Anspruch 9, dadurch gekennzeichnet, dass das Auswerforgan (8) derart gestaltet und angeordnet ist, dass es zur axialen oder achsparallelen Abstützung des Rohlings (3) an dessen Stirnseite in die Ziehmatrize (2) oder in deren bodenseitigen Öffnungsbereich ragt.
- Umformwerkzeug nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Ziehmatrize (1) axial oder achsparallel hin- und herbewegbar geführt oder angetrieben und mit der axialen Bewegung oder dem Arbeitshub des Ziehdorns (6) gekoppelt oder antriebstechnisch synchronisiert ist.
- Umformwerkzeug nach Anspruch 19, dadurch gekennzeichnet, dass die Kopplung und/oder Synchronisation mittels eines axial oder achsparallel angetriebenen Triebstößels oder Pressenstößels (19) realisiert ist, mit dem gemeinsam der Ziehdorn (6) über die Dornstange (5) und die Ziehmatrize (1) über einen oder mehrere achsparallele Stößelbolzen (18,18a-18d) verbunden sind.
- Umformwerkzeug nach Anspruch 19 oder 20 und einem der Ansprüche 7, 8, 9 oder 10, gekennzeichnet durch die Anordnung einer dem eingangsseitigen Öffnungsbereich der Ziehmatrize (1) benachbarten Halteeinrichtung (12), die feststehend und komplementär zu einem Endabschnitt des Rohlings (3) zwecks kraft- und/oder formschlüssigen Eingriffs mit diesem ausgebildet ist.
- Umformwerkzeug nach Anspruch 21, dadurch gekennzeichnet, dass die Halteeinrichtung (12) als an eine Öffnungskante der Ziehmatrize (1) angrenzender Haltering mit einer Innenumfangswandung (12a,24) gestaltet ist, die schräg gegenüber der Matrizen-Mittelachse (1a) und komplementär zu einer vorgeformten Erweiterung oder Ausstülpung (11) eines hinteren Rohlingsendes verläuft.
- Umformwerkzeug nach Anspruch 21 oder 22, dadurch gekennzeichnet, dass die Dornstange (5) oder der daran befestigte Ziehdorn (6) von einem Klemmring (21) umgeben sind, der der Halteeinrichtung (12) oder gegebenenfalls dem Hattering gegenüberliegt und dabei mit diesen einen Ringspalt zur Aufnahme und Halterung des Rohlings (3) an seinem hinteren Ende bildet.
- Umformwerkzeug nach Anspruch 23, dadurch gekennzeichnet, dass die Außenumfangswandung (23) des Klemmrings (21) und die Innenumfangswandung (24) des Halterings (12) zueinander parallel liegen.
- Umformwerkzeug nach Anspruch 23 oder 24, dadurch gekennzeichnet, dass die Dornstange (5) an ihrem dem Ziehdorn (6) abgewandten Ende mit einem axial oder achsparallel antreibbaren Triebstößel oder Pressenstößel (19) verbunden ist, an dem ein Druckfederelement (22) mit einem Ende abgestützt ist und mit dem anderen gegen eine hintere Stirnseite des Klemmrings (21) mit einer Vorspannung anliegt, die abhängig vom Bewegungshub des Trieb- oder Pressenstößels (19) einstellbar ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE10004732 | 2000-01-28 | ||
DE10004732 | 2000-01-28 | ||
PCT/DE2001/000227 WO2001054839A1 (de) | 2000-01-28 | 2001-01-19 | Verfahren und umformwerkzeug zur zylinderrohrherstellung mittels fliesspressen |
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EP1250199A1 EP1250199A1 (de) | 2002-10-23 |
EP1250199B1 true EP1250199B1 (de) | 2003-07-23 |
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EP01909499A Expired - Lifetime EP1250199B1 (de) | 2000-01-28 | 2001-01-19 | Verfahren und umformwerkzeug zur zylinderrohrherstellung mittels fliesspressen |
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EP (1) | EP1250199B1 (de) |
AT (1) | ATE245499T1 (de) |
AU (1) | AU2001237229A1 (de) |
DE (2) | DE10190194D2 (de) |
WO (1) | WO2001054839A1 (de) |
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DE102019103926A1 (de) * | 2019-02-15 | 2020-08-20 | Walter Henrich GmbH | Verfahren und Vorrichtung zum axialen Umformen eines Rohres |
CN111069445B (zh) * | 2019-11-27 | 2021-03-02 | 江阴和宏精工科技有限公司 | 一种铜管扩径拉拔的壁厚控制方法 |
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DE466434C (de) * | 1928-10-16 | Siegener Eisenbahnbedarf Akt G | Verfahren zum genauen Innenziehen von Hohlkoerpern | |
GB922266A (en) * | 1962-01-08 | 1963-03-27 | Joseph Wilson Yowell | Improvements in or relating to the production of tubes |
FR1528079A (fr) * | 1967-04-28 | 1968-06-07 | Nippon Denso Co | Procédé pour le finissage des carcasses de moteurs électriques |
DE2401345A1 (de) * | 1974-01-09 | 1975-07-10 | Mannesmann Roehren Werke Ag | Zieh-streckverfahren zur herstellung langer rohre und vorrichtung zur durchfuehrung des verfahrens |
-
2001
- 2001-01-19 AT AT01909499T patent/ATE245499T1/de not_active IP Right Cessation
- 2001-01-19 WO PCT/DE2001/000227 patent/WO2001054839A1/de active IP Right Grant
- 2001-01-19 DE DE10190194T patent/DE10190194D2/de not_active Expired - Fee Related
- 2001-01-19 EP EP01909499A patent/EP1250199B1/de not_active Expired - Lifetime
- 2001-01-19 AU AU2001237229A patent/AU2001237229A1/en not_active Abandoned
- 2001-01-19 DE DE50100414T patent/DE50100414D1/de not_active Expired - Lifetime
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Publication number | Publication date |
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EP1250199A1 (de) | 2002-10-23 |
AU2001237229A1 (en) | 2001-08-07 |
DE10190194D2 (de) | 2003-02-20 |
WO2001054839A1 (de) | 2001-08-02 |
DE50100414D1 (de) | 2003-08-28 |
ATE245499T1 (de) | 2003-08-15 |
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