WO1988007904A1 - Ensemble douille de serrage-adaptateur - Google Patents

Ensemble douille de serrage-adaptateur Download PDF

Info

Publication number
WO1988007904A1
WO1988007904A1 PCT/US1988/001191 US8801191W WO8807904A1 WO 1988007904 A1 WO1988007904 A1 WO 1988007904A1 US 8801191 W US8801191 W US 8801191W WO 8807904 A1 WO8807904 A1 WO 8807904A1
Authority
WO
WIPO (PCT)
Prior art keywords
collet
chuck
adapter
spindle nose
jaws
Prior art date
Application number
PCT/US1988/001191
Other languages
English (en)
Inventor
Ralph E. Ammendolia
Bruce A. Hartman
Original Assignee
Ammendolia Ralph E
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 Ammendolia Ralph E filed Critical Ammendolia Ralph E
Publication of WO1988007904A1 publication Critical patent/WO1988007904A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/201—Characterized by features relating primarily to remote control of the gripping means
    • B23B31/207—Characterized by features relating primarily to remote control of the gripping means using mechanical transmission through the spindle
    • B23B31/2073—Axially fixed cam, moving jaws

Definitions

  • the present invention relates to a novel, improved assembly for coupling a draw-in collet to the spindle of a lathe.
  • Workpieces are commonly supported for rotation with the spindle of a lathe by bolting the workpiece to the face.plate of the lathe or by mounting the workpiece in a chuck or in a draw-in collet.
  • the chuck be manually removed from the lathe on which it is mounted.
  • the collet is retracted into a cooperating adapter by the drawbar of the lathe on which the collet is installed to collapse the jaws of the collet and secure a tool or workpiece in it.
  • An important disadvantage of this conventional work-supporting system for lathes is that the collet jaws can be collapsed to the extent that the collet will be sucked into the lathe mechanism when the lathe drawbar is retracted unless a tool or workpiece is first installed in the collet. This can damage or destroy the collet and/or damage the lathe.
  • This novel assembly which allows the collet to be mounted without removing the lathe chuck, includes a - conventional draw-in collet, a spindle nose, and a collet adapter.
  • the collet is slidably mounted in a bore extending from end-to-end through the spindle nose, and the spindle nose is fastened to the mounted lathe chuck. Thus, it will rotate with the latter but cannot move longitudinally.
  • One end of the spindle nose through bore is tapered to match the external, tapered configuration of the jaw end of the collet. Consequently, by displacing the collet in the spindle nose, the collet jaws can be biased or squeezed together to secure a tool or a workpiece in the collet.
  • the opposite end of the collet is threaded into the collet adapter.
  • This adapter is in turn threaded into the rectilinearly displaceable slide provided in the lathe chuck to move the radially extending jaws of the chuck in and out. Rectilinear movement of the chuck jaw-operating slide is effected by a conventional, typically hydraulically operated drawbar. Consequently, by displacing the lathe drawbar, the collet of our novel collet/adapter assembly can be drawn into the spindle nose of the assembly to bias its jaws together and thereby secure the tool or workpiece in the collet.
  • Another feature of our novel collet/adapter assembly is a set of integral stops on the spindle nose. These stops lie in the paths of movement of the chuck jaws and limit the retraction of those jaws when the collet/adapter assembly is installed. The limiting of chuck jaw retraction in turn limits the travel of the chuck slide to which the collet adapter is connected. This keeps the collet from being drawn into the spindle nose far enough to be damaged when the drawbar of the lathe is retracted to draw the collet into the spindle nose.
  • the jaw end of the collet is bored out to make it capable of holding larger tools or workpieces than it otherwise ould. Thereafter, the collet may be removed and then reinstalled as circumstances warrant.
  • a further important feature of our invention is a novel collet/adapter design which positively and precisely locates the collet in the same position — both longitudinally and angularly about its longitudinal axis — each time the collet is reinstalled. This is important because it insures that there is the same, identical, concentric relationship between the longitudinal axis of the workpiece-receiving bore and the axis of rotation of the collet each time the collet is replaced.
  • the diameters of the two separately machined segments of the workpiece might not match within acceptable limits; and the axial centerlines of those segments might not be aligned with an acceptable degree of accuracy.
  • the novel spindle noses we have disclosed herein will also accept a chuck closer. ' his makes the collet/adapter assembly capable of accepting collets with jaw diameters (or face sizes) limited only by the capacity of the chuck closer.
  • the primary object of the present invention is the provision of novel, improved collet/adapter assemblies which make it possible to mount a draw-in collet on a lathe and to rotatably couple the collet to the lathe spindle without removing a previously mounted chuck from the lathe.
  • a related and also important object of our invention resides in the provision of novel collet/adapter assemblies which allow a collet to be mounted and coupled to a lathe spindle without the downtime or risk of injury involved in the changeover from chuck to collet heretofore required to mount a draw-in collet on a lathe.
  • Yet another important object of our invention resides in the provision of assemblies and systems as defined in the preceding objects which are capable of accepting collets of different types and sizes including collets with jaw diameters so large that the collet jaws cannot be closed by the collet supporting spindle nose.
  • collet/adapter assemblies which include: a collet, a collet supporting spindle nose which is adapted to be fixed to a lathe chuck for rotation therewith at a fixed longitudinal location and which is so constructed that displacement of the collet relative thereto will result in the collet jaws being biased toward each other to secure a tool or workpiece therebetween, and a collet adapter for so connecting the collet to the drawbar of the lathe that displacement of the drawbar will result in the collet being drawn into the spindle nose to bias the collet jaws toward each other and into gripping relationship with the tool or workpiece mounted therein.
  • FIG. 1 is a fragmentary view of a metal turning lathe equipped with a collet/adapter assembly in accord with the principles of the present invention
  • FIG. 2 is an exploded view of certain components of the lathe and the components of the collet/adapter assembly;
  • FIG. 3 is a longitudinal, vertical section through the collet/adapter assembly
  • FIG. 4 is an end view of the collet/adapter assembly
  • FIG. 5 is a view similar to FIG. 3 of a collet/adapter assembly which embodies the principles of the present invention and which is equipped with a chuck closer, thereby making the assembly capable of accepting collets with larger jaw diameters than it otherwise could.
  • FIGS. 1 and 2 depict a lathe 20 equipped with a collet/adapter assembly 22 constructed in accord with, and embodying, the principles of the present invention.
  • the collet/adapter assembly is employed to support bar stock workpieces or the like and tools such as drill bits, for example.
  • collet/adapter assembly 22 allows a collet to be employed without first removing chuck 24 from lathe 20 as would be necessary if a conventional changeover from a chuck-to-collet type of support were being made.
  • Chuck 24 is bolted to, and rotates with, the spindle mounted face plate 26 of lathe 20.
  • the chuck includes a circularly sectioned housing 28 in which a number (typically three) of radially displaceable jaws 30 are mounted. Jaws 30 are displaced inwardly to clamp a workpiece or tool 31 (see FIG. 1) therebetween and outwardly to release the workpiece or tool.
  • the radial displacement of chuck jaws 30 is effected by a slide 32. This slide is rectilinearly displaceable in a bore 34 through chuck housing 28 in the directions indicated by double-headed arrow 36 in FIG. 2.
  • the collet/adapter assembly 22 employed to equip lathe 20 with a tool or workpiece supporting collet includes a conventional draw-in collet 42, a collet supporting spindle nose 44, and a hollow, cylindrical, collet adapter 46.
  • Collet 42 is of conventional construction. It includes three, identical, equiangularly related spring jaws .48, 50, and 52 (see FIG. 4) which can be biased or squeezed toward each other to grip and secure the selected workpiece or tool 31 in the central opening 54 between the jaws.
  • the opposite end 58 of the collet is threaded as is shown in FIG. 2. As is best shown in the same Figure and in
  • collet 42 is slidably installed in a central bore 60 which extends from end-to-end through spindle nose 44.
  • Matching external and internal tapers 62 and 64 are formed at the cooperating, outer ends of collet 42 and spindle nose 44, respectively. Consequently, by displacing collet 42 relative to spindle nose 44 in the direction indicated by arrow 66 in FIG. 2 to draw the collet into spindle 44, collet jaws 48, 50, and 52 are squeezed or biased toward each other by spindle nose 44. This results in the collet jaws gripping the tool or workpiece 31 installed in central collet opening 54 to secure the tool or workpiece in the collet. Jaws. 8...52 may be bored out to increase the diameter of opening 54 and thereby make collet 42 capable of accepting workpieces (or tools) or larger diameter. As is best shown in FIGS.
  • the barrel 68 of the spindle nose 44 in which bore 60 is formed is surrounded by two, adjacent, integral, annular flanges 70 and 72.
  • Flange 70 is dimensioned to fit snugly in, and be seated against the bottom 74 of, a complementary, circular recess 76 which is formed in, and opens onto the exposed face 78 of, chuck housing 28.
  • the barrel 68 of spindle nose 44 is mounted in the recess 76 at the free or exposed end of lathe chuck 24.
  • the spindle nose is fixed to lathe chuck 24 by equiangularly spaced, threaded fasteners 80. These fasteners extend through apertures 82 in spindle nose flanges 70 and 72 into internally threaded apertures 84 which are formed in the casing 28 of lathe chuck 24.
  • collet adapter 46 This insures that the longitudinal axis of the workpiece receiving bore 54 drilled or otherwise machined in collet 42 and the axis of rotation of the collet will be concentric each time collet 42 is installed in collet adapter 46. As a consequence, a workpiece mounted in bore 54 will rotate about the same identical axis as the collet and can therefore be machined to closer tolerances than would otherwise be the case.
  • External threads 98 are formed on collet adapter 46. The adapter is threaded into an internally threaded aperture 99 in the rectilinearly translatable slide 32 of lathe chuck 24. This couples the collet adapter to the chuck slide for movement therewith as the slide is rectilinearly translated along the bore 34 in the chuck casing 28 in which the slide is housed.
  • Threads 99 are not present in the slide of a conventional lathe chuck and must therefore be formed to accommodate collet/adapter assembly 22. This, however, is a minor undertaking, especially in the relation to the problems that are solved by the utilization of the collet/adapter assembly.
  • Drawbar 40 is also coupled to slide 32 to effect this rectilinear translation of the slide. The connection is furnished by external threads 100 on the drawbar and cooperating, internal threads 102 in slide 32.
  • collet/adapter assembly 22 With the components of collet/adapter assembly 22 assembled as shown in FIG. 3 and the assembly coupled to chuck 24 as shown in FIG. 1, displacement of drawbar 40 to the left as shown by arrow 92 will displace slide 32 and collet adapter 46 in the same direction. This draws collet 42 into spindle nose 44 because the latter is maintained in a longitudinally fixed position by chuck 24.
  • collet jaws 48, 50, and 52 are squeezed toward each other by the sliding engagement between the tapered external surface 62 on the collet and the cooperating tapered internal surface 64 ' in the spindle nose. This securely retains the workpiece or tool 31 in the collet.
  • the flats or stops 86, 88, and 90 on the flange 72 of spindle nose 44 limit the retraction of chuck slide 32 and drawbar 40 as the latter is displaced in the direction of arrow" 92 to draw collet 42 into spindle nose 44 and thereby secure a workpiece or tool in the collet.
  • spindle nose 44 is constructed to accept chucks of various type — for example, round, square, and hexagonal collets. Further ore, as shown in FIG. 5, a conventional chuck closer 106 with internal threads 108 can be threaded on the external threads 110 formed on the barrel 68 of spindle nose 44. This allows collet type step chucks 114 with jaw diameters larger than that of the tapered, jaw closing bore section 64 in spindle nose 44 to be employed in collet/adapter assembly 22.
  • the assembly 116 illustrated in FIG. 5 is designed to accept collets with a face diameter D of approximately two inches.
  • Chuck closer 106 is a hollow, cylindrical component. When threaded onto spindle nose 44, it is located longitudinally relative to the latter for proper jaw closing cooperation with step chuck 114 by the radial shoulder 117 furnished by the flange 72 on spindle nose 44. The engagement of the inner end 107 of chuck closer 106 with shoulder 117 also rotationally locks the chuck closer and spindle nose together.
  • the bore 118 through the free or exposed end of chuck closer 106 is tapered as indicated by reference character 120 to match the tapered jaws 122 of step chuck 114. Consequently, as the chuck is drawn into the chuck closer by the above-discussed displacement of lathe drawbar 40 to the left as indicated by arrow 92 in FIG. 2, the collet jaws 122 are squeezed toward each other by the sliding engagement between the tapered external surfaces 124 of step chuck 114 and the cooperating internal tapered surface 120 in chuck closer 106. This securely retains the workpiece (or po ⁇ ibly tool) being mounted in the bore 126 surrounded by the jaws 122 of the chuck.
  • the taper of the surface 120 in chuck closer 106 is so related to the taper of the surface 64 in spindle nose 44 that surface 120 will be engaged by and squeeze together step chuck jaws 122 before the tapered surface 128 at the forward end of step chuck shank 130 seats against the tapered surface.64 in spindle nose 44. This insures that chuck closer 106 will operate properly. At the same time, this arrangement provides a sliding fit between step chuck 106 and spindle nose 44 that rigidly supports the step chuck without freedom to wobble in the forward end of the spindle nose.
  • the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

Ensemble douille de serrage-adaptateur (22) pouvant être moulé sur une broche (20) de tour pour tourner avec elle sans qu'il faille enlever le mandrin (24) du tour comme c'est le cas jusqu'ici. L'ensemble comprend une tête de broche (44) boulonnée sur la partie avant du mandrin (24) du tour, une douille (42) montée sur la tête de broche (44) par introduction dans celle-ci et pouvant être introduite dans cet élément pour coincer ensemble les mâchoires (48, 50, 52) de la douille de serrage et, de la sorte, maintenir fermement un outil ou une pièce à usiner dans la douille (42), enfin un adaptateur de douille (46) fixé sur la douille (42) et au coulisseau (32) du mandrin (24) actionné par la barre de traction (40), de manière que la douille (42) puisse être introduite dans la tête de la broche (44) pour coincer ensemble les mâchoires de la douille (48, 50, 52) comme indiqué ci-dessus en déplaçant la barre de traction (40) dans un sens rectiligne. On peut utiliser un bouchon (106) de mandrin monté sur la tête de broche pour solliciter les mâchoires (48, 50, 52) de la douille au lieu d'une tête de broche. Ce dispositif permet à l'ensemble douille/adaptateur (22) d'accepter des douilles dont les mâchoires ont un diamètre plus grand que cela ne serait possible autrement.
PCT/US1988/001191 1987-04-13 1988-04-13 Ensemble douille de serrage-adaptateur WO1988007904A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3769987A 1987-04-13 1987-04-13
US037,699 1987-04-13

Publications (1)

Publication Number Publication Date
WO1988007904A1 true WO1988007904A1 (fr) 1988-10-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/001191 WO1988007904A1 (fr) 1987-04-13 1988-04-13 Ensemble douille de serrage-adaptateur

Country Status (2)

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JP (1) JPH02503076A (fr)
WO (1) WO1988007904A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5071145A (en) * 1990-12-24 1991-12-10 Energy Dynamics, Inc. Master jaw assembly
US5340130A (en) * 1991-08-12 1994-08-23 Gerard Gorse Equipements De Machines-Outils S.A. Polyvalent clamp chuck for machine tools
US5431416A (en) * 1993-10-29 1995-07-11 Thornton; John R. Collet attachment/closer
US6554288B2 (en) * 2001-09-07 2003-04-29 Carmel Tomoni Collet adapter
US9511423B2 (en) 2013-11-22 2016-12-06 Masa Tool, Inc. Adapter enabling small draw-type collet to operate as stationary-type collet in large lathe spindle sleeve
US9999931B2 (en) 2013-05-30 2018-06-19 Schaublin Sa Locking mechanism for a collet assembly
EP3991893A1 (fr) * 2020-11-03 2022-05-04 Hainbuch GmbH Spannende Technik Système de serrage pourvu de broche et de porte-pièces ainsi que procédé de couplage du système de serrage
EP4088843A1 (fr) * 2021-05-14 2022-11-16 Hainbuch GmbH Spannende Technik Système de serrage pourvu de broche et de porte-pièce, ainsi que broche et porte-pièce associés

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449284A (en) * 1946-03-29 1948-09-14 Edward A Dorman Machine tool adapter
US2478195A (en) * 1945-01-23 1949-08-09 Hull Ernest Collet adapter
US2735688A (en) * 1956-02-21 Collet and chuck
US3746353A (en) * 1971-08-30 1973-07-17 Kalamazoo Ind Inc Collet chuck adapter
US4477095A (en) * 1981-07-07 1984-10-16 Hardinge Brothers, Inc. Collet adapter
US4602798A (en) * 1984-04-23 1986-07-29 James Wettstein Collet arbor for application to turning and milling procedures

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735688A (en) * 1956-02-21 Collet and chuck
US2478195A (en) * 1945-01-23 1949-08-09 Hull Ernest Collet adapter
US2449284A (en) * 1946-03-29 1948-09-14 Edward A Dorman Machine tool adapter
US3746353A (en) * 1971-08-30 1973-07-17 Kalamazoo Ind Inc Collet chuck adapter
US4477095A (en) * 1981-07-07 1984-10-16 Hardinge Brothers, Inc. Collet adapter
US4602798A (en) * 1984-04-23 1986-07-29 James Wettstein Collet arbor for application to turning and milling procedures

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5071145A (en) * 1990-12-24 1991-12-10 Energy Dynamics, Inc. Master jaw assembly
US5340130A (en) * 1991-08-12 1994-08-23 Gerard Gorse Equipements De Machines-Outils S.A. Polyvalent clamp chuck for machine tools
US5431416A (en) * 1993-10-29 1995-07-11 Thornton; John R. Collet attachment/closer
US6554288B2 (en) * 2001-09-07 2003-04-29 Carmel Tomoni Collet adapter
US9999931B2 (en) 2013-05-30 2018-06-19 Schaublin Sa Locking mechanism for a collet assembly
US9511423B2 (en) 2013-11-22 2016-12-06 Masa Tool, Inc. Adapter enabling small draw-type collet to operate as stationary-type collet in large lathe spindle sleeve
EP3991893A1 (fr) * 2020-11-03 2022-05-04 Hainbuch GmbH Spannende Technik Système de serrage pourvu de broche et de porte-pièces ainsi que procédé de couplage du système de serrage
WO2022096466A1 (fr) * 2020-11-03 2022-05-12 Hainbuch Gmbh Spannende Technik Système de serrage comprenant une broche et un porte-pièce et procédé d'accouplement de ce système de serrage
EP4088843A1 (fr) * 2021-05-14 2022-11-16 Hainbuch GmbH Spannende Technik Système de serrage pourvu de broche et de porte-pièce, ainsi que broche et porte-pièce associés

Also Published As

Publication number Publication date
JPH02503076A (ja) 1990-09-27

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