US3677672A - Apparatus for the manufacture of powder metal helical gears - Google Patents

Apparatus for the manufacture of powder metal helical gears Download PDF

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Publication number
US3677672A
US3677672A US18948A US3677672DA US3677672A US 3677672 A US3677672 A US 3677672A US 18948 A US18948 A US 18948A US 3677672D A US3677672D A US 3677672DA US 3677672 A US3677672 A US 3677672A
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United States
Prior art keywords
die
tool
rotary
pressure plates
punch
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Expired - Lifetime
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US18948A
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English (en)
Inventor
Jerry E Harrington
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AMPLEX VAN WERT Corp A CORP OF DE
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Chrysler Corp
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Assigned to FIDELITY UNION TRUST COMPANY, TRUSTEE reassignment FIDELITY UNION TRUST COMPANY, TRUSTEE MORTGAGE (SEE DOCUMENT FOR DETAILS). Assignors: CHRYSLER CORPORATION
Assigned to CHRYSLER CORPORATION reassignment CHRYSLER CORPORATION ASSIGNORS HEREBY REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID INVENTIONS AND RELEASE THEIR SECURITY INTEREST. (SEE DOCUMENT FOR DETAILS). Assignors: ARNEBECK, WILLIAM, INDIVIDUAL TRUSTEE, FIDELITY UNION BANK
Assigned to CHRYSLER CORPORATION reassignment CHRYSLER CORPORATION PARTES REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID PATENTS ALSO RELEASE THEIR SECURITY INTEREST. (SEE RECORD FOR DETAIL) Assignors: MANUFACTURERS NATIONAL BANK OF DETROIL (CORPORATE TRUSTEE) AND BLACK DONALD E., (INDIVIDUAL TRUSTEE)
Assigned to AMPLEX VAN WERT CORPORATION, A CORP. OF DE. reassignment AMPLEX VAN WERT CORPORATION, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHRYSLER CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • B22F5/085—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs with helical contours
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • This invention relates specifically to the pressing of powder metal helical gears.
  • a lower tool punch is fastened rigidly to a lower ram of a press.
  • a die is clamped to a press table.
  • An upper tool punch is clamped rigidly to an upper ram of the press.
  • a center pin or core rod is usually fixed securely to a lower center ram of the press, i.e., a core rod ram if the pressed article is to include a central bore or the like.
  • any inner or outer configuration on the article to be formed such as keys, keyways, gear tooth forms, cam contours or any geometric form, must be on an axis with the vertical motion of the press rams to allow punch entrance into the die for pressing the powder metal and to allow ejection of the pressed article from the die.
  • the invention will be specifically described in connection with apparatus for manufacturing powder metal helical gears although it is not intended to be limited thereto and finds application elsewhere. For example, it is readily applicable to the pressing of plastic powder and may be used to fabricate a wide variety of off-axis configurations.
  • the tool punches In the case of helical gears, the tool punches have helical lands and the die has corresponding helical grooves into which the punches turn.
  • FIG. 1 is a detailed side view of a preferred apparatus according to the invention which is shown partly in section;
  • FIG. 2 is a fragmentary elevational view of the apparatus showing the upper punch and cam arrangement partly in sectron;
  • FIG. 3 is a fragmentary elevational view of the apparatus showing the lower cam arrangement partly in section;
  • FIG. 4 is a bottom plan view of the upper punch
  • FIG. 5 is a vertical section through the upper punch
  • FIG. 6 is a fragmentary view of the upper punch showing the land patterns thereof;
  • FIG. 7 is a top plan view of the lower punch
  • FIG. 8 is a vertical section through the lower punch
  • FIG. 9 is a fragmentary view of the lower punch showing the land pattern thereof.
  • FIG. 10 is a plan view of the die
  • FIG. 11 is a vertical section through the die showing the groove pattern therein.
  • the invention contemplates in its preferred embodiment the pressing of powder metal in a die by subjecting the powder to a compacting pressure from two substantially oppositely disposed punches while simultaneously twisting or rotating the punches.
  • a compacting pressure from two substantially oppositely disposed punches while simultaneously twisting or rotating the punches.
  • the novel apparatus shown therein includes upper and lower tool members, generally indicated at 10 and 12 respectively, disposed on opposite sides of a die table 14.
  • a die 16 having a powder receiving bore 17 is secured to the die table by a clamping ring 18 and bolt 20 as shown.
  • Upper and lower tool members 10 and 12 are respectively fastened to the upper and lower rams 22 and 24 of a conventional vertical press (not shown) by means of fixed pressure plates 26 and 28 as shown. These plates are fixed in the sense that they are not free to rotate but are only capable of reciprocating movement according to the movement of the rams of the press.
  • Rotary movement of the tool members with respect to plates 26 and 28 is provided by means of rotary pressure plates 30 and 32 which are positioned against pressure plates 26 and 28 respectively by clamping means such as clamping rings 36 and 38, which are shown bolted to plates 26 and 28 respectively.
  • the clamping rings are preferably positioned against the rotary plates in combination with sets of ball bearings 40 as shown.
  • bearing assemblies 34 which may consist of precision taper roller bearings as shown.
  • upper and lower tool members 42 and 44 Securely fastened to rotary plates 30 and 32 respectively are upper and lower tool members 42 and 44 which form, along with upper and lower cam follower means such as rollers 46 and 48, a cam arrangement associated with the apparatus punch means for imparting a pre-determined twisting or rotary motion to the upper and lower tool members when they are raised and lowered relative to the die for insertion therein.
  • the arrangement may consist of a pair of oppositely disposed assemblies as shown or only one assembly or more than two if necessary.
  • Tool members 42 and 44 each include sets of cam track means or channels, such as grooves 50 and 52 which are better seen in FIGS. 2 and 3 respectively.
  • the grooves are precision ground to the identical helix angle required on the part to be pressed and are peripherally disposed around the members.
  • the grooves and rollers may be of any shape such as cylindrical or tapered as is well known in the: cam art. Furthermore, sliding contact or rolling contact may be used although rolling contact is preferred.
  • Upper and lower tool members 10 and 12 are engaged by suitable cam follower means, such as rollers 46 and 48, which project into grooves 50 and 52 respectively.
  • the rollers project inwardly from and are rotatably secured to their respective cam follower support means such as column assemblies 54 and 56 which are in turn. secured to die table 14 as shown.
  • the support means positions the cam follower means for engagement with the cam tracks.
  • the columns are preferably in pairs and spaced on the center line of die 16 as shown, left and right, to permit entrance over the die for powder fill.
  • Upper and lower punch means such as punches S8 and 60, are secured to the upper and lower tool members by, for example, bolted clamp rings 62 and 64.
  • the punches have several peripheral helical lands 66 as best seen in FIGS. 4 through 6 for upper punch 58 and FIGS. 7 through 9 for lower punch 60. These lands have a predetermined warp or helix angle depending on the specifications desired in the helical gear to be pressed.
  • Die 16 is correspondingly helically grooved as indicated at 68 in FIGS. 10 and 11 to mate with the lands on punches 58 and 60.
  • the helix angle tooth form 68 may be machined into the bore wall of die 16 as can be best seen in those Figures.
  • Lower tool member 12 further includes a core rod assembly generally indicated at 70 comprising an elongated core rod 72 which is rotatably mounted by means of caged tapered bearing race assembly including tapered bearings 74 for free rotation within lower tool member 12 as shown in FIG. 1.
  • Assembly 70 may be covered by neoprene seal 76 or the like as shown.
  • An additional seal such as O-ring 78 may be included in the upper portion of lower tool member 12 also if desired. The purpose of the seals is to provide protection against the entrance of falling powder metal.
  • the lands or edges of the punches move in a helical path as the punches rotate and move into and out of the die.
  • the exact configuration and length of the cam tracks is of course dependent upon the particular shape of the tooth pattern or the like desired in the pressed article.
  • the lower tool member 12 undergoes a similar movement but to less extent as can be seen from the differences in position between the two tool members in the drawing.
  • Core rod 72 extending through the axial bore 80 of lower punch'60 also extends into axial bore 82 of upper punch 58 during pressing to form a center hole in the helical gear.
  • the die does not direct the punches through the twisting or rotary motion.
  • Such an approach has been tried unsuccessfully due to the fact that dies are usually made of materials such as tungsten carbide which can absorb extremely high pressures but which are brittle and have little or no resistance to shear. It is therefore an important feature of this invention that the cam arrangement generate the rotary movement during pressing without substantial aid or direction from the die.
  • upper punch 58 is raised and lower punch 60 turns upwardly into the die until the piece is ejected.
  • the pressed gear turns freely in the die to permit its ejection therefrom.
  • the punch is then returned to its initial position and the apparatus is ready to press another piece.
  • the gear may be subjected to a sintering heat treatment or the like to complete its manufacture.
  • the pressing operation of the apparatus disclosed herein has been described as involving the simultaneous downward movement of the upper punch and upward movement of the lower punch, it is contemplated that other modes of operation may be used
  • the lower punch may be inserted into the die and maintained in a fixed position during pressing by the upper punch. The lower punch would move only to eject the pressed piece.
  • any powder material may be pressed in this fashion such as plastic powders, ferrous and non-ferrous metal powders and the like.
  • the cam tracks could be formed in the column supports and the followers could be carried by the upper and lower tool members.
  • the apparatus provides punches adapted to be rotatably inserted into a die by the vertical motion of the rams of a conventional press.
  • a predetermined rotary motion is provided by a cam arrangement associated with the punches, the arrangement including cam track means and cam follower means which impart the predetemiined rotary motion to the punches during insertion into the die.
  • the helix angle generated by the punch rotation permits the punches to enter the die press the part and eject it.
  • a powder pressing apparatus comprising:
  • the tool member including peripherally disposed helically configured path cam track means and coacting cam follower means associated with the cam track means for imparting controlled rotary motion to the tool member during its reciprocation,
  • cam follower support means positioning the cam follower means in engagement with the cam track means
  • a powder receiving die member positioned to receive an end of the tool member
  • punch means disposed at the end of the tool member for insertion into the die when the tool member reciprocates
  • the punch means and die including mating lands and grooves which are so shaped relative to the configuration of the cam track means such that when the tool member reciprocates and controllably rotates the punch means into and out of the die member the rotation imparted to the punch means, by the cam track means and cam follower means alone, twists it into and out of the die member in mating fashion.
  • the apparatus of claim 1 including:
  • a rotary pressure plate connected to the tool member and oppositely disposed thereon with respect to the punch means
  • a clamping means positioning the rotary plate against the fixed plate but rotatable with respect thereto
  • a bearing assembly positioned between the rotary plate and fixed plate whereby the rotary plate may rotate freely with respect to the fixed plate.
  • the apparatus of claim 1 including:
  • the punch means comprises upper and lower punches fixed to the inner end of the upper and lower tool members respectively and disposed toward each other, and wherein the cam follower support means includes oppositely disposed upper supports for receiving the upper tool member therebetween and oppositely disposed lower supports for receiving the lower tool member therebetween, the supports being positioned on the upper and lower sides of a die table carrying the die member,
  • the cam follower means comprises a pair of spaced inwardly projecting bodies carried by the supports in a position of engagement with the cam track means of the tool members, and
  • the cam track means on each of the tool members comprises spaced grooves for accommodating the projecting bodies and imparting rotary movement to the tool members when they are moved toward and away from each other.
  • clamping means positioning the rotary pressure plates against the fixed pressure plates, and upper and lower bearing assemblies carried between the upper and lower pressure plates respectively to facilitate rotation of the rotary pressure plates with respect to the fixed pressure plates.
  • Apparatus for pressing helical gears or the like from powder comprising:
  • a die table a die having a powder receiving bore extending between opposite major surfaces thereof, the bore walls having a grooved female pattern
  • each member having a pair of equally spaced helical cam track grooves peripherally positioned thereon, the grooves extending over at least a portion of the length thereof,
  • each of said punches having a male pattern complementary to that of the female die pattem,.
  • cam track grooves being so shaped relative to the patterns of the punches and die such that the rotary motion imparted to the punches, by the cam track grooves and cam followers alone, twists them into and out of the die in mating fashion.
  • the apparatus of claim 5 including:
  • upper and lower fixed pressure plates overlaying the upper and lower rotary pressure plates: respectively, each being adapted for contact with the upper and lower rams of a press respectively,
  • clamping means positioning the rotary pressure plates against the fixed pressure plates
  • upper and lower bearing assemblies carried between the upper and lower pressure plates to facilitate rotation of the rotary pressure plates with respect to the fixed pressure plates.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Basic Packing Technique (AREA)
US18948A 1970-03-12 1970-03-12 Apparatus for the manufacture of powder metal helical gears Expired - Lifetime US3677672A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1894870A 1970-03-12 1970-03-12

Publications (1)

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US3677672A true US3677672A (en) 1972-07-18

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Country Status (6)

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US (1) US3677672A (es)
CA (1) CA937739A (es)
DE (1) DE2110294C3 (es)
ES (1) ES194166Y (es)
FR (1) FR2078131A5 (es)
GB (1) GB1323623A (es)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909167A (en) * 1972-12-29 1975-09-30 C Olivetti & C S P A Ufficio B Apparatus for moulding helical parts by compacting powdered materials
US4050283A (en) * 1974-06-20 1977-09-27 Bayerisches Leichtmetallwerk Graf Blucher Von Wahlstatt Kg Method and apparatus for forging bevel gears
DE4303588A1 (es) * 1992-02-08 1993-08-12 Hitachi Powdered Metals
US5366363A (en) * 1991-08-17 1994-11-22 Werkzeugbau Alvier Ag Modular apparatus for compression forming or calibrating of powder metal workpieces
FR2750065A1 (fr) * 1996-06-20 1997-12-26 Miba Sintermetall Ag Outil de moulage pour comprimer un corps faconne constitue d'une poudre de frittage
US5906837A (en) * 1994-08-02 1999-05-25 Mannesmann Aktiengesellschaft Device for producing pressed articles
WO1999029450A1 (de) * 1997-12-07 1999-06-17 Feintool International Holding Ag Verfahren zum bearbeiten eines werkstückes
EP1153735A3 (de) * 2000-05-11 2002-08-07 Wilhelm Fette GmbH Stempel für Rundlaufpresse
US20080105021A1 (en) * 2006-11-07 2008-05-08 Yahya Hodjat Method of forming a gear
CN110560684A (zh) * 2019-09-29 2019-12-13 合肥波林新材料股份有限公司 一种粉体材料的压制模具和制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10064640C2 (de) * 2000-12-22 2003-01-09 Henkel Kgaa Tablettenpreßstempel-Anordnung
EP3684528A1 (en) 2017-09-22 2020-07-29 Lamina Technologies SA Process and apparatus for manufacturing a cutting tool by pressing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2319479A (en) * 1939-10-18 1943-05-18 Grotelite Company Self-locking plastic injection mold
US2445742A (en) * 1944-12-07 1948-07-20 Victor Metal Products Corp Automatic molding machine and method
US2561735A (en) * 1949-07-21 1951-07-24 Haller John Machine for molding helical gears
US2767428A (en) * 1952-04-12 1956-10-23 Borg Warner Apparatus for making torquetransmitting elements
US3118183A (en) * 1961-05-05 1964-01-21 Procter & Gamble Rotary tablet press having means to rotate the plungers
US3465386A (en) * 1966-06-16 1969-09-09 Brown Machine Co Of Michigan Locking mechanism for differential pressure forming apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2319479A (en) * 1939-10-18 1943-05-18 Grotelite Company Self-locking plastic injection mold
US2445742A (en) * 1944-12-07 1948-07-20 Victor Metal Products Corp Automatic molding machine and method
US2561735A (en) * 1949-07-21 1951-07-24 Haller John Machine for molding helical gears
US2767428A (en) * 1952-04-12 1956-10-23 Borg Warner Apparatus for making torquetransmitting elements
US3118183A (en) * 1961-05-05 1964-01-21 Procter & Gamble Rotary tablet press having means to rotate the plungers
US3465386A (en) * 1966-06-16 1969-09-09 Brown Machine Co Of Michigan Locking mechanism for differential pressure forming apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909167A (en) * 1972-12-29 1975-09-30 C Olivetti & C S P A Ufficio B Apparatus for moulding helical parts by compacting powdered materials
US4050283A (en) * 1974-06-20 1977-09-27 Bayerisches Leichtmetallwerk Graf Blucher Von Wahlstatt Kg Method and apparatus for forging bevel gears
US5366363A (en) * 1991-08-17 1994-11-22 Werkzeugbau Alvier Ag Modular apparatus for compression forming or calibrating of powder metal workpieces
DE4303588A1 (es) * 1992-02-08 1993-08-12 Hitachi Powdered Metals
US5409662A (en) * 1992-02-08 1995-04-25 Hitachi Powdered Metals Co., Ltd. Method and apparatus for extruding powder material
US5906837A (en) * 1994-08-02 1999-05-25 Mannesmann Aktiengesellschaft Device for producing pressed articles
FR2750065A1 (fr) * 1996-06-20 1997-12-26 Miba Sintermetall Ag Outil de moulage pour comprimer un corps faconne constitue d'une poudre de frittage
WO1999029450A1 (de) * 1997-12-07 1999-06-17 Feintool International Holding Ag Verfahren zum bearbeiten eines werkstückes
US6327887B1 (en) 1997-12-07 2001-12-11 Feintool International Holding Ag Process for shaping a work piece
EP1153735A3 (de) * 2000-05-11 2002-08-07 Wilhelm Fette GmbH Stempel für Rundlaufpresse
US20080105021A1 (en) * 2006-11-07 2008-05-08 Yahya Hodjat Method of forming a gear
CN110560684A (zh) * 2019-09-29 2019-12-13 合肥波林新材料股份有限公司 一种粉体材料的压制模具和制备方法

Also Published As

Publication number Publication date
ES194166Y (es) 1975-03-16
FR2078131A5 (es) 1971-11-05
DE2110294B2 (de) 1974-03-21
DE2110294C3 (de) 1974-10-24
ES194166U (es) 1974-11-16
CA937739A (en) 1973-12-04
DE2110294A1 (de) 1971-09-30
GB1323623A (en) 1973-07-18

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Owner name: FIDELITY UNION TRUST COMPANY, TRUSTEE,NEW JERSEY

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