EP0638382A1 - Verfahren zur Herstellung eines Rotors aus Aluminium Pulver mit einer Stahlschaft - Google Patents

Verfahren zur Herstellung eines Rotors aus Aluminium Pulver mit einer Stahlschaft Download PDF

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Publication number
EP0638382A1
EP0638382A1 EP94111322A EP94111322A EP0638382A1 EP 0638382 A1 EP0638382 A1 EP 0638382A1 EP 94111322 A EP94111322 A EP 94111322A EP 94111322 A EP94111322 A EP 94111322A EP 0638382 A1 EP0638382 A1 EP 0638382A1
Authority
EP
European Patent Office
Prior art keywords
steel shaft
rotor
shaft
aluminum powder
alloy
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Withdrawn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
EP94111322A
Other languages
English (en)
French (fr)
Inventor
Shinichiro C/O Itami Works Of Sumitomo Shigezumi
Kiyoaki C/O Itami Works Of Sumitomo Akechi
Toshihiko C/O Itami Works Of Sumitomo Kaji
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0638382A1 publication Critical patent/EP0638382A1/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Withdrawn legal-status Critical Current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
    • 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
    • B22F7/08—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 with one or more parts not made from powder
    • 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
    • B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
    • 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
    • B22F7/062—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 involving the connection or repairing of preformed parts
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the present invention relates to a method of manufacturing a rotor made of aluminum powder alloy having a steel shaft used for an air compressor and the like.
  • a rotor made of aluminum powder alloy which is manufactured from aluminum alloy powder by means of powder metallurgy. That is, aluminum alloy powder made by the quenching solidification method is used, and solidified by means of sintering, forging or the like so as to manufacture a rotor made of aluminum powder alloy.
  • the thus manufactured rotor made of aluminum powder alloy is connected and fixed by various methods to a steel shaft which has been differently made.
  • Examples of commonly used connecting methods are: a hot upsetting method in which a rotor, the size of which is a little larger than a predetermined one, is disposed around a shaft in a metallic die, and then the rotor is compressed at a raised temperature so that the rotor can be connected and fixed to the shaft; a press-fitting method in which the inner circumferential surface of a rotor and the outer circumferential surface of a shaft are subjected to serration processing, and then the shaft is mechanically fitted onto the inner circumferential surface of the rotor so that the shaft is fixed to the rotor; and a shrinkage fitting method in which a heated rotor is fitted to a shaft and then cooled so that the rotor and shaft are connected and fixed to each other by using a difference between the thermal expansion coefficients.
  • the rotor made of aluminum powder alloy and the steel shaft are differently manufactured, and further not only the shaft but also the inner circumferential surface of the rotor must be machined so that the size and configuration can be appropriately adjusted. Accordingly, the conventional connecting methods are disadvantageous in that the number of manufacturing processes is increased and the cost is high. Especially, in the case of the press-fitting method, the complicated serration processing is required, and the serration processing is one of the main reasons of high cost.
  • the present invention has been made in view of the circumstances of the conventional methods. It is an object of the present invention to provide a method of manufacturing a rotor made of aluminum powder alloy having a steel shaft characterized in that: the steel shaft is connected and fixed to the rotor made of aluminum powder alloy simultaneously when the aluminum powder alloy rotor is manufactured, so that the number of manufacturing processes is reduced and accordingly the cost is reduced; the occurrence of cracks is avoided in the process of connection; and the connecting strength of the rotor and shaft can be enhanced.
  • the present invention provides a method of manufacturing a rotor made of aluminum powder alloy having a steel shaft comprising the steps of: disposing a steel shaft in a forging metallic die; charging aluminum alloy powder or a preliminarily formed body of aluminum alloy powder into the metallic die around the shaft; and forging the aluminum alloy powder or the preliminarily formed body so that a rotor of aluminum powder alloy is manufactured and at the same time the rotor and the shaft are connected and fixed to each other.
  • the rotor made of aluminum powder alloy is manufactured, and at the same time the rotor made of aluminum powder alloy is integrally connected with and strongly fixed to the steel shaft in the same process. Consequently, compared with the conventional methods, the rotor made of aluminum powder alloy having a steel shaft can be manufactured with the reduced number of the manufacturing processes and with the reduced cost.
  • the connecting strength can be greatly enhanced compared with that of the conventional method.
  • the connecting strength can be further enhanced by the effect of shrinkage fitting provided by the cooling after forging operation has been completed.
  • a reaction layer of aluminum and iron is formed on the connection interface between the outer circumferential surface of the shaft and the inner circumferential surface of the aluminum powder alloy rotor, so that a stronger connection can be accomplished.
  • an oxide film is formed on the outer circumferential surface of the steel shaft in a process of heat treatment or the like.
  • the connecting strength can be effectively enhanced.
  • a preliminarily formed body 6 of Al alloy powder was charged onto an upper portion of a lower punch 2 inside a forging metallic die 1 while the preliminarily formed body 6 was heated to a temperature immediately below the eutectic temperature of Al alloy.
  • a steel shaft 5 was inserted onto an upper portion of a core rod 3 inside the lower punch 2.
  • the following conditions were variously changed: the shaft temperature; the difference between the top and the bottom of roughness on the connecting portion of the shaft where the shaft is connected to the rotor; and the surface roughness R max of the connecting portion of the shaft.
  • some of the steel shafts were subjected to acid cleaning for removing the oxide films formed on the surfaces, and others were not subjected to acid cleaning.
  • the preliminarily formed body 5 was subjected to hot forging by an upper punch 4 and the lower punch 2 with a forging pressure of 7 to 10 ton/cm2 so that the preliminarily formed body 5 was solidified to a density of 100%.
  • a rotor 7 of Al powder alloy of which the composition is shown in Table 1 was made.
  • the lower punch 2 and the core rod 3 were raised and the rotor 7 made of Al powder alloy was recovered.
  • the outside diameter of each rotor 7 of Al powder alloy obtained in this way was 66 mm, and the length was 45 mm.
  • Each rotor was connected and fixed to the steel shaft 5.
  • slippage torque of the thus obtained rotor of Al powder alloy having a steel shaft was measured in the following manner: After the rotor 7 made of Al powder alloy had been fixed to a rotor mount 8, the steel shaft 5 was rotated with a torque wrench 9, and the slippage torque of the steel shaft 5 was measured when the steel shaft 5 was rotated.
  • the results of the measurement are shown in Table 2 together with the shaft temperature, the difference between the top and the bottom of roughness on the shaft surface, the surface roughness R max , and the existence of an oxide film.
  • the rotor made of aluminum powder alloy is manufactured by means of forging, it can be connected and fixed to the steel shaft without leaving any gaps. Accordingly, redundant manufacturing processes can be omitted and manufacturing cost can be reduced. At the same time, the rotor is not cracked in the process of connection, and the connecting strength of the rotor and shaft of the present invention can be greatly enhanced as compared with the conventional rotor and shaft.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
EP94111322A 1993-08-04 1994-07-20 Verfahren zur Herstellung eines Rotors aus Aluminium Pulver mit einer Stahlschaft Withdrawn EP0638382A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP212294/93 1993-08-04
JP5212294A JPH0748607A (ja) 1993-08-04 1993-08-04 鋼製シャフト付きアルミニウム粉末合金製ローターの製造方法

Publications (1)

Publication Number Publication Date
EP0638382A1 true EP0638382A1 (de) 1995-02-15

Family

ID=16620206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111322A Withdrawn EP0638382A1 (de) 1993-08-04 1994-07-20 Verfahren zur Herstellung eines Rotors aus Aluminium Pulver mit einer Stahlschaft

Country Status (3)

Country Link
EP (1) EP0638382A1 (de)
JP (1) JPH0748607A (de)
KR (1) KR950005417A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19815320A1 (de) * 1998-04-06 1999-10-07 Bayerische Motoren Werke Ag Verfahren zum Verbinden zumindest zweier Strukturteile
DE10331631B3 (de) * 2003-06-30 2005-01-05 Ehw Thale Sintermetall Gmbh Bauteil
DE19602589B4 (de) * 1995-02-03 2006-10-19 Htm Ag, Biel Verfahren zur Herstellung einer verschleißfesten bruchsicheren Schneckenspitze
GB2462275A (en) * 2008-07-31 2010-02-03 Cummins Turbo Tech Ltd A method of connection a turbine shaft to a rotor
WO2016115104A1 (en) * 2015-01-16 2016-07-21 Gkn Sinter Metals, Llc Method of producing composite components using sinter fit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962772A (en) * 1974-09-04 1976-06-15 Michigan Powdered Metal Products, Inc. Shaft-supported composite high-strength machine element and method of making the same
EP0034847A1 (de) * 1980-02-19 1981-09-02 Metallgesellschaft Ag Werkstücke mit gepanzerten Kanten und/oder Flächen
EP0151103A2 (de) * 1984-01-24 1985-08-07 BÖHLER Gesellschaft m.b.H. Verfahren zur Herstellung von kraftübertragenden, insbesondere drehmomentübertragenden Elementen
JPS63189608A (ja) * 1987-02-02 1988-08-05 Sumitomo Electric Ind Ltd 自動車エンジン用ロツカ−ア−ム及びその製造方法
JPS6411914A (en) * 1987-07-06 1989-01-17 Sumitomo Electric Industries Rotor made of steel compexing aluminum powder alloy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962772A (en) * 1974-09-04 1976-06-15 Michigan Powdered Metal Products, Inc. Shaft-supported composite high-strength machine element and method of making the same
EP0034847A1 (de) * 1980-02-19 1981-09-02 Metallgesellschaft Ag Werkstücke mit gepanzerten Kanten und/oder Flächen
EP0151103A2 (de) * 1984-01-24 1985-08-07 BÖHLER Gesellschaft m.b.H. Verfahren zur Herstellung von kraftübertragenden, insbesondere drehmomentübertragenden Elementen
JPS63189608A (ja) * 1987-02-02 1988-08-05 Sumitomo Electric Ind Ltd 自動車エンジン用ロツカ−ア−ム及びその製造方法
JPS6411914A (en) * 1987-07-06 1989-01-17 Sumitomo Electric Industries Rotor made of steel compexing aluminum powder alloy

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8837, Derwent World Patents Index; Class M22, AN 88-260899 *
DATABASE WPI Section Ch Week 8908, Derwent World Patents Index; Class M22, AN 89-058609 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19602589B4 (de) * 1995-02-03 2006-10-19 Htm Ag, Biel Verfahren zur Herstellung einer verschleißfesten bruchsicheren Schneckenspitze
DE19815320A1 (de) * 1998-04-06 1999-10-07 Bayerische Motoren Werke Ag Verfahren zum Verbinden zumindest zweier Strukturteile
DE10331631B3 (de) * 2003-06-30 2005-01-05 Ehw Thale Sintermetall Gmbh Bauteil
GB2462275A (en) * 2008-07-31 2010-02-03 Cummins Turbo Tech Ltd A method of connection a turbine shaft to a rotor
WO2016115104A1 (en) * 2015-01-16 2016-07-21 Gkn Sinter Metals, Llc Method of producing composite components using sinter fit
US10888928B2 (en) 2015-01-16 2021-01-12 Gkn Sinter Metals, Llc Method of producing composite components using sinter fit

Also Published As

Publication number Publication date
KR950005417A (ko) 1995-03-20
JPH0748607A (ja) 1995-02-21

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