US3676917A - Method of making a porous metal spinning ring - Google Patents

Method of making a porous metal spinning ring Download PDF

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Publication number
US3676917A
US3676917A US88262A US3676917DA US3676917A US 3676917 A US3676917 A US 3676917A US 88262 A US88262 A US 88262A US 3676917D A US3676917D A US 3676917DA US 3676917 A US3676917 A US 3676917A
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United States
Prior art keywords
ring
wall
die
mold
porosity
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Expired - Lifetime
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US88262A
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English (en)
Inventor
Andrew J Wayson
John T O'connell
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Merriman Inc
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Merriman Inc
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Assigned to LITTON INDUSTRIAL PRODUCTS, INC., A DE CORP reassignment LITTON INDUSTRIAL PRODUCTS, INC., A DE CORP SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: QUAMCO, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
    • D01H7/52—Ring-and-traveller arrangements
    • D01H7/60—Rings or travellers; Manufacture thereof not otherwise provided for ; Cleaning means for rings
    • D01H7/602—Rings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/031—Pressing powder with other step

Definitions

  • Spinning rings made of powdered metal in which the metal particles have been compressed in a die under very high pressure in the order of 30 tons psi have been in use for many years in the textile industry and their self-lubricating properties are well understood in the art.
  • the ring after its initial formation in the die, is sintered to cause agglomeration of the metal particles into a stronger structure. Then, the ring is machined on its inner and outer walls to give the proper configuration and dimensions. Following the machining operation, the ring is heat treated to improve the wearing characteristics of the surface without impairing the oil transmitting properties. Polishing is the final operation.
  • the present invention contemplates a process whereby an inner sloping wall like that of the Wayson patent can be produced without the necessity of machining the inner wall.
  • the absence of machining is advantageous because it has been found that when the surface of a product made of powdered metal is machined through the use of conventional cutting or grinding tools, the agglomerated particles are rearranged or reshaped in such manner as to render the surface less porous than it was before the machining operation.
  • the preferred method of carrying out the shaping process to produce the improved ring is through the use of a tapered female die into which the basic unmachined molded and sintered ring is forced to cause the inner and outer walls to be changed from their original shapes which ordinarily would be substantially cylindrical surfaces to short truncated conical surfaces.
  • the outer wall surface during the shaping process, is in sliding compressive engagement with the die.
  • the inner wall surface of the ring is shaped without engagement with any tool to assume the truncated conical form.
  • the ring body After the ring body has been shaped in the manner just described, it is removed from the die by an ejector. Then the exterior portion of the ring is subjected to conventional machining operations to produce the final required configuration. Final finishing and polishing operations are then performed along with the necessary drilling or cutting of oil passages in the body of the ring and if desired the cutting of a circular oil groove in the top of the ring.
  • the tapering of the ring may also be achieved by the use of other known mechanisms capable of causing reduction in circumference of cylindrical elements.
  • One such mechanism could be a set of tapered rolls appropriately spaced into which the ring could be forced while rotating to be deformed to the required shape. Again in this procedure, the inner wall of the ring would be untouched by any tools and hence its porosity would be unaffected.
  • FIG. I is a cross-sectional elevation of a horizontal type spinning ring in its original molded condition.
  • FIG. 2 illustrates the ring of FIG. I positioned above a die into which it is about to be forced.
  • FIG. 3 shows the ring of FIGS. 1 and 2 forced into the die thereby to assume a new configuration in which the inner and outer walls are tapered.
  • FIG. 4 is illustrative of the original ring modified according to the step shown in FIG. 3 with its exterior turned to give the ring the exact required final configuration.
  • FIGS. 5 and 6 illustrate an alternative mechanism for carrying out the method of tapering the inner and outer walls of the ring.
  • FIG. 1 there is illustrated in preliminary form in vertical cross-section a molded horizontal type spinning ring 2 made of highly compressed metal particles.
  • the method of making such ring is well understood in the industry.
  • the powdered metal is subjected to pressures in the order of 30 tons psi which is sufficient to create an initially stable article.
  • the ring after removal from the mold is subjected to a sintering operation in which the minute metal particles agglomerate to produce a much stronger unit but without destroying the basic porosity.
  • the total volume of a molded spinning ring made from highly com pressed powdered metal may consist of about of solid particles and the remaining 20 percent of the total volume is represented by continuous passages between the particles through which the lubricating oil may travel to spread itself ultimately on the ring surface thereby to provide the required lubricating film at those areas which are engaged by the rotating traveler.
  • the sintering process strengthens the ring to such degree that it then has characteristics that make subsequent machining and limited deforming operations possible without likelihood of fracture of the agglomerated material.
  • the inner wall 4 and the outer wall 6 are substantially short cylindrical sections.
  • one or the other or both walls must have some positive taper to permit the molded ring to be removed from the die. Any negative taper on either of the ring walls would make removal of the ring from the dies impossible, unless the dies were of the split type which is not only structurally undesirable, but also undesirable from the standpoint of creating vertical seams in the related walls.
  • the lower surface 8 of the ring has a slight downward inward slope as do the upper and lower surfaces 10 and 12, respectively, of the inner flange 14 of the ring.
  • the second step in the process is preferably carried out through the use of a circular die 16 having a tapered female aperture 18 whose upper dimension as at 20 is sufficient to allow the starting entry of ring 2 therein.
  • a pressing element 22 is moved downwardly to engage the top of the ring 2 to force the ring into the die 16 as illustrated in FIG. 3.
  • the outer wall 6 of the original ring is thus deformed to a truncated conical shape 24 as shown in FIG. 3 and the inner wall 4 of the ring which was originally substantially cylindrical as shown in FIG. 1 is correspondingly changed to an inverted truncated conical formation 26 substantially parallel to the outer conical surface 24.
  • the pressing element 22 acts quickly to force ring 2 from its position above die 16 into the die as illustrated in FIG. 3.
  • the pressing element 22 is then raised a sufficient distance above die 16 and an ejector 36 moves upwardly to force the ring 2 out of die 16.
  • the ring on removal from die 16 is then machined on its exterior to produce the finished ring shown in FIG. 4.
  • the body 34 is narrowed as at 38 to create the outer flange 40 which in cooperation with the existing inner flange 14 acts to carry a conventional traveler.
  • Oil groove 42 may be cut in the top of the ring and oil passages 44 and 46 may be drilled to provide means for transmitting oil to the oil groove.
  • the tapered inner wall 26 of the ring, as well as the underside 12 of inner flange 14 remains untouched by any tools during the change in configuration from that shown in FIG. 1 to that shown in FIGS. 3 and 4.
  • the novel method of creating the negative tapered conical formation of the inner wall produces a ring having characteristics not available when made to the required finished form according to previous practices.
  • the invention thus contemplates not only a new method of creating the ring, but also a new ring in which the critical porous surfaces retain a porosity undiminished because of the absence of subsequent machining operations.
  • FIGS. 2 and 3 While the preferred method of creating the short truncated conical inner and outer wall surfaces is through the use of a die such as illustrated in FIGS. 2 and 3, it will be appreciated that the method is not to be limited to any single mechanism capable of achieving the desired result. Accordingly, a second mechanism for carrying out the method is illustrated in FIGS. and 6. Under this procedure, the ring 2 is placed in engagement in engagement with three tapered rolling elements 48, 50 and 52 mounted for rotation on shafts 54, 56 and 58, respectively.
  • a rotating pressing element 60 whose axis 62 is aligned with the axis of ring 2 descends to force the rotating ring 2 downwardly between rolls 48, 50 and 52 thereby to gradually deform the cylindrical body of the ring into a conical body 64 similar to the configuration of the ring shown in FIG. 3.
  • the subsequent steps performed on ring 2 after it has been shaped by the mechanism of FIGS. 5 and 6 are the same as those heretofore described.
  • the angle of the inner wall of the ring body to the vertical v may be in the order of 6, but this may be any negative angle as pointed out in the patent to Wayson US. Pat. No. 3,41 I286 previously referred to herein.
  • tapered die when used in the method claims appended hereto, it is intended to include any means capable of deforming the body of the initially molded ring so that the inner wall is shaped to a negative taper without any machining or modification of the wall surface, thus to leave the inner wall porosity undiminished.
  • a method of making a porous metal spinning ring comprising the steps of compressing powdered metal in a mold to form a traveler supporting body having inner and outer walls and an inner circular flange adjacent the upper part of said inner wall, removing the ring from the mold, forcing the ring into a tapered die to shape the said walls into the form of short truncated cones without appreciably changing the porosity of that part of the inner wall adjacent said inner flange, removing the ring from said die, and machining the ring to the required final ring configuration without changing the under surface of said inner flange or the inner wall surface adjacent said inner flange 2.
  • said ring being sintered after being removed from the said mold and before being forced into said die.
  • a method of making a porous metal spinning ring comprising the steps of compressing powdered metal in a mold to form a traveler supporting body having inner and outer walls neither of which has negative draft and said inner wall is sub stantially cylindrical, removing the ring from the mold, sintering said ring, forcing the ring into a tapered die to deform the outer wall into the form of a short truncated cone and to cause the inner wall to assume an analogous shape without appreciably changing the porosity of that part of the inner wall adjacent said inner flange, removing the ring from said die, and machining the ring to the required final ring configuration without changing the under surface of said inner flange or the inner wall surface adjacent said inner flange.
  • a method of forming an inverted truncated conical inner wall in a molded sintered powdered metal spinning ring which ring initially has been formed with substantially cylindrical inner and outer walls comprising the steps of forcing said ring into a tapered die whose shape is analogous to the required final shape of the inner wall of the ring, the forcing of said ring into said die being accomplished by applying pressure to the top circular surface of said ring in a direction parallel to the die axis whereby the inner wall will be untouched during the shaping and the porosity of the inner wall at its upper part will remain substantially unchanged from its original molded condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US88262A 1970-11-10 1970-11-10 Method of making a porous metal spinning ring Expired - Lifetime US3676917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8826270A 1970-11-10 1970-11-10

Publications (1)

Publication Number Publication Date
US3676917A true US3676917A (en) 1972-07-18

Family

ID=22210344

Family Applications (1)

Application Number Title Priority Date Filing Date
US88262A Expired - Lifetime US3676917A (en) 1970-11-10 1970-11-10 Method of making a porous metal spinning ring

Country Status (10)

Country Link
US (1) US3676917A (OSRAM)
JP (1) JPS5136204B1 (OSRAM)
BE (1) BE775097A (OSRAM)
CA (1) CA933055A (OSRAM)
CH (1) CH529853A (OSRAM)
DE (2) DE2152937A1 (OSRAM)
ES (1) ES396822A1 (OSRAM)
FR (1) FR2113879B1 (OSRAM)
GB (1) GB1320823A (OSRAM)
IT (1) IT944800B (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805360A (en) * 1973-01-29 1974-04-23 Motor Wheel Corp Method and apparatus for sizing brake drum rings
US4164063A (en) * 1978-02-23 1979-08-14 General Motors Corporation Process for making bearing locking collar

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US275938A (en) * 1883-04-17 Die for forming spinning-ring holders
US325692A (en) * 1885-09-08 Hub-band
US3370947A (en) * 1964-02-03 1968-02-27 Talmage Charles Robert Method of securing a sintered metal brake track in a brake drum shell by expanding a green compact during sintering

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US275938A (en) * 1883-04-17 Die for forming spinning-ring holders
US325692A (en) * 1885-09-08 Hub-band
US3370947A (en) * 1964-02-03 1968-02-27 Talmage Charles Robert Method of securing a sintered metal brake track in a brake drum shell by expanding a green compact during sintering

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Moore, Abstract of Serial No. 599,363, filed June 14, 1945, published June 10, 1952 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805360A (en) * 1973-01-29 1974-04-23 Motor Wheel Corp Method and apparatus for sizing brake drum rings
US4164063A (en) * 1978-02-23 1979-08-14 General Motors Corporation Process for making bearing locking collar

Also Published As

Publication number Publication date
JPS5136204B1 (OSRAM) 1976-10-07
IT944800B (it) 1973-04-20
FR2113879A1 (OSRAM) 1972-06-30
DE2152937A1 (de) 1972-05-25
CH529853A (de) 1972-10-31
GB1320823A (en) 1973-06-20
CA933055A (en) 1973-09-04
BE775097A (fr) 1972-05-09
FR2113879B1 (OSRAM) 1974-09-27
DE7140256U (de) 1975-10-02
ES396822A1 (es) 1974-06-16

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Owner name: QUAMCO, INC., 100 CONSTITUTION PLAZA, SUTE 1560, H

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Effective date: 19841026

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Owner name: CONNECTICUT BANK & TRUST COMPANY, N.A., 100 CONSTI

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Owner name: HELLER FINANCIAL, INC.

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Effective date: 19891213