EP0414332A1 - Verfahren zur Herstellung plattierter Blöcke und Profile - Google Patents

Verfahren zur Herstellung plattierter Blöcke und Profile Download PDF

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Publication number
EP0414332A1
EP0414332A1 EP90250212A EP90250212A EP0414332A1 EP 0414332 A1 EP0414332 A1 EP 0414332A1 EP 90250212 A EP90250212 A EP 90250212A EP 90250212 A EP90250212 A EP 90250212A EP 0414332 A1 EP0414332 A1 EP 0414332A1
Authority
EP
European Patent Office
Prior art keywords
compacts
profiles
metal capsule
production
extrusion
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Withdrawn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
EP90250212A
Other languages
German (de)
English (en)
French (fr)
Inventor
Norbert Dr.-Ing. Dautzenberg
Viktor Dipl.-Ing. Linnemann
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0414332A1 publication Critical patent/EP0414332A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools

Definitions

  • the invention relates to a method for producing blocks and profiles by extrusion in accordance with the preamble of claim 1.
  • a molten steel is atomized into tiny particles by water atomization, which solidify with a spattering shape.
  • This steel powder is subjected to a reducing annealing in a vacuum with solid carbon as a reducing agent in order to remove the oxide skin surrounding the individual grains.
  • the powder is then pressed into disc-shaped compacts with a density of at least 6 g / cm3.
  • the compacts are stacked in a sheet metal capsule to form a preform for extrusion.
  • the sheet metal capsule is then closed and evacuated before it is inserted into the extrusion press after heating and pressed to the desired block or profile.
  • the sheet metal jacket of the extruded sheet metal capsule which adheres firmly to the block or profile, can easily be removed if necessary by mechanical or chemical processing (eg turning, grinding or pickling).
  • This method has the advantage that preforms of practically any length can be produced without the need for complex isostatic pressing processes.
  • To produce the disc-shaped compacts all that is required is a conventional powder press with a corresponding press tool.
  • a composite hollow preform As the starting material, which consists of a cylindrical hollow block made of the carrier material and of a further surrounding (in the case of external plating) and / or enclosed by it (in the case of Inner plating) Hollow block consists of the plating material.
  • the individual hollow blocks are produced by drilling out solid blocks, that is, in a very complex manner. So that the surface between the hollow blocks does not oxidize and causes defects in the extruded tube, the gaps between the hollow blocks are welded on each end before the preforms for the extrusion are heated. Since the hollow blocks are basically made from feed material that was produced by casting, process-related material disadvantages (eg segregation, coarse-grained structure) can often not be avoided.
  • the object of the invention is to provide a method which enables the production of blocks and profiles made of steel which are clad on the inner surface (in the case of hollow profiles) and / or the outer surface or on parts of these surfaces with a different type of material.
  • the process is intended to ensure material properties that can often only be achieved by powder metallurgy, i.e. in particular, it should be ensured that there is no fine-grained structure in the extruded block or profile.
  • the invention is based on the fact that the blocks or profiles are produced by extruding a heated preform, which, in the manner known from DE 36 43 016 C1, consists of disc-shaped compacts stacked on top of one another, which were pressed from steel powder on a conventional powder press and preferably sintered afterwards , assembled and completely enclosed by a tin capsule.
  • a heated preform which, in the manner known from DE 36 43 016 C1, consists of disc-shaped compacts stacked on top of one another, which were pressed from steel powder on a conventional powder press and preferably sintered afterwards , assembled and completely enclosed by a tin capsule.
  • the preform is composed of cross-sectional areas perpendicular to the intended pressing direction from correspondingly different materials in some areas.
  • a preform is used to produce an externally clad steel tube, the disc-shaped compacts of which have a central perforation into which an inner mandrel or plug can engage to form the inner surface of the tube, and whose periphery is formed from the desired plating material, while the other areas of the compacts consist of the carrier material.
  • the sheet metal capsule into which the compacts are inserted, has an inner jacket which lies against the lateral surface of the central perforation.
  • the compacts There are several options for producing the compacts. In principle, it is possible to assemble the compacts from several loose parts, each of which fills an area of the cross-sectional area that is to be formed by a specific material. It is essential in any case that the individual parts are pre-compressed as evenly as possible and also to one another to the same extent (same relative compression), so that a product with a constant distribution of surface area of the different materials across the product cross-section and with complete freedom from pores is produced.
  • the disc-shaped compacts are produced in one piece, ie as a layered composite body.
  • a pressing technique can be used, as will be described in more detail below with reference to FIGS. 1 to 6, which show the different phases of the pressing cycle on a disk-shaped compact using sectional images of the pressing tool.
  • the compact produced is a hollow cylinder which consists predominantly of a base material which is to be regarded as a carrier material for the steel pipe to be produced therefrom.
  • the compact has an outer jacket layer made of a high-quality powder metal, which is to form the plating layer of the steel tube.
  • Figure 1 the filling position for filling the base material 5, which makes up the majority of the disc-shaped composite molded body, is shown. While the inner lower punch 4 is in its lower filling position, the outer lower punch 3 is just like the cylindrical core 2 with its upper end face flush with the upper edge of the die 1 of the pressing tool.
  • a filling system (not shown) can move in a known manner over the filling space formed between the core 2 and the outer lower punch 3 and fill the filling space flush with the base material 5.
  • the lower punch 4 is lowered a little in order to lower the inner upper punch 7 (FIG. 2) and to immerse it in the mold space at the top.
  • the punches 4 and 7 are pressed in opposite directions into the filled base material 5 in order to compress it to such an extent that a sufficiently dimensionally stable partial molded body 5 is produced which no longer breaks when the outer lower punch 3, as shown in FIG. 3, follows subtracted below to get to its filling position.
  • the molded part 5 is moved with its upper end face flush with the end face of the die 1. Between the die 1 and the outer circumferential surface of the molded part 5 and the inner lower punch 4, which is flush below it, a second filling space is created, which is filled with a high-quality powder material 8 for the intended cladding by means of a second filling system, also not shown.
  • the two lower punches 3 and 4 are jointly slightly lowered to allow the two upper punches 6 and 7 to dip into the opening of the die.
  • the outer lower punch 3 is then moved upwards until it is flush with the lower punch 4, so that the powder material 8 undergoes approximately the same pre-compression as the base material 5 (FIG. 4). Only then is the compacting of the compact carried out (FIG. 5) until the compact has reached the density which is desired for the final extrusion process.
  • the two upper punches 6 and 7 and the two lower punches 3 and 4 are moved against one another with the die at rest and the core 2 not moving until the final pressing position.
  • the die 1 and the core 2 are pulled down together with the lower punches 3 and 4 stationary, so that the disk-shaped compact 5, 8 formed is exposed. This can then be stacked as a composite molded body in the manner described with other compacts in a sheet metal capsule.
  • the two upper stamps 6 and 7 can also be combined into a single upper stamp.
  • the outer lower punch 3 with the upper punch 6, 7 striking it would have to be moved downward to produce the partial shaped body 5 during the pre-compression.
  • the upper stamp 7 together with the lower stamp 4 and possibly together with the core could first be used after the upper stamps 6 and 7 have been immersed in the die 1 2 are moved downwards until the molded body 5 which is inevitably taken along has reached a symmetrical height position with respect to the powder column 8. This ensures that the upper punch 6 is moved into the powder material 8 in the same way as the lower punch 3.
  • the method described above for the production of steel tubes with a circular cross-section can also be applied in a corresponding modification to the manufacture of angular tubes or other closed profiles as well as open profiles and also on blocks with a closed profile. It is readily possible to arrange the plating material in the compacts in such a way that, after extrusion of the preform made therefrom, the plating material only appears at certain points on the surface of the profile produced.
  • the blocks and profiles produced by the method according to the invention have a completely pore-free structure.
  • the transitions between the individual parts of the original compacts and the transitions between the compacts stacked one above the other are no longer recognizable as separation points in the extruded product, but instead show a completely homogeneous bond.
  • the method according to the invention makes it possible to produce preforms for the production of extruded products in the form of composite molded articles of almost any size from powdered starting material, without the need for expensive equipment.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)
EP90250212A 1989-08-24 1990-08-16 Verfahren zur Herstellung plattierter Blöcke und Profile Withdrawn EP0414332A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3928436 1989-08-24
DE19893928436 DE3928436C1 (enrdf_load_stackoverflow) 1989-08-24 1989-08-24

Publications (1)

Publication Number Publication Date
EP0414332A1 true EP0414332A1 (de) 1991-02-27

Family

ID=6388052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250212A Withdrawn EP0414332A1 (de) 1989-08-24 1990-08-16 Verfahren zur Herstellung plattierter Blöcke und Profile

Country Status (2)

Country Link
EP (1) EP0414332A1 (enrdf_load_stackoverflow)
DE (1) DE3928436C1 (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1758080A1 (de) * 1968-03-29 1972-04-06 John Haller Verfahren zum Herstellen zusammengesetzter Erzeugnisse aus gesinterten Metallen
DE3009882A1 (de) * 1980-03-14 1981-09-24 Nyby Uddeholm AB, 64480 Torshälla Verbundrohr und verfahren zu seiner herstellung
DE2462747C2 (de) * 1974-04-19 1984-02-23 Nyby Bruk AB, Nybybruk Strangpreßbolzen zur pulvermetallurgischen Herstellung von Rohren aus rostfreieem Stahl
US4578317A (en) * 1982-06-17 1986-03-25 Nippon Piston Ring Co., Ltd. Journal
DE3643016C1 (de) * 1986-12-12 1987-08-13 Mannesmann Ag Verfahren zur Herstellung von Bloecken oder Profilen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262400C3 (de) * 1972-12-15 1975-05-07 Mannesmann Ag, 4000 Duesseldorf Verfahren zum Herstellen von mehrschichtigen Formkörpern mit vollem oder hohlem Querschnitt
US4353155A (en) * 1980-06-25 1982-10-12 Hillebrand Arthur N Method for manufacturing composite powder metal parts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1758080A1 (de) * 1968-03-29 1972-04-06 John Haller Verfahren zum Herstellen zusammengesetzter Erzeugnisse aus gesinterten Metallen
DE2462747C2 (de) * 1974-04-19 1984-02-23 Nyby Bruk AB, Nybybruk Strangpreßbolzen zur pulvermetallurgischen Herstellung von Rohren aus rostfreieem Stahl
DE3009882A1 (de) * 1980-03-14 1981-09-24 Nyby Uddeholm AB, 64480 Torshälla Verbundrohr und verfahren zu seiner herstellung
US4578317A (en) * 1982-06-17 1986-03-25 Nippon Piston Ring Co., Ltd. Journal
DE3643016C1 (de) * 1986-12-12 1987-08-13 Mannesmann Ag Verfahren zur Herstellung von Bloecken oder Profilen

Also Published As

Publication number Publication date
DE3928436C1 (enrdf_load_stackoverflow) 1991-04-18

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