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WO1986001758A1 - Tool collet spindle locking system - Google Patents

Tool collet spindle locking system Download PDF

Info

Publication number
WO1986001758A1
WO1986001758A1 PCT/EP1985/000480 EP8500480W WO8601758A1 WO 1986001758 A1 WO1986001758 A1 WO 1986001758A1 EP 8500480 W EP8500480 W EP 8500480W WO 8601758 A1 WO8601758 A1 WO 8601758A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking system
fact
spindle
collet
tool
Prior art date
Application number
PCT/EP1985/000480
Other languages
French (fr)
Inventor
Cornelio Molteni
Original Assignee
Cornelio Molteni
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 Cornelio Molteni filed Critical Cornelio Molteni
Publication of WO1986001758A1 publication Critical patent/WO1986001758A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • B23B31/10Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/201Characterized by features relating primarily to remote control of the gripping means
    • B23B31/204Characterized by features relating primarily to remote control of the gripping means using fluid-pressure means to actuate the gripping means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • B23B31/10Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/208Longitudinally-split sleeves, e.g. collet chucks with a tool positioning stop

Definitions

  • the present invention relates to a locking system for the spindle supporting the
  • the system according to the present invention is based on the innovative principle
  • the system according to the present iivention comprises also a device for
  • 5 figure is a sectional elevational view of a spindle provided with the locking system of
  • the system of the present invention may be of any conventional type, and therefore its
  • housing 1 may comprise at its upper end an adaptor 2 of any size and shape, such as an
  • the housing 1 comprises at its
  • collet (not shown) which may also be of any size and shape,
  • the plenum chamber 8 is
  • Such a medium is generally an
  • incompressible fluid such as oil
  • incompressible fluid such as oil
  • the pressure of such a medium may be regulated through a little piston 11, inserted in the bushing 12 screwed inside the housing 1, said piston 11 being actuated by the screw
  • connection between piston 11 and plenum chamber 8 is effected through a
  • this locking system might also be arranged 0 in other positions inside the spindle housing and therefore said system could be
  • the system of the present invention may also provide for a positioning device for

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)

Abstract

A locking system for the spindle supporting the tool collet of machine tools, comprising a chamber (8) filled with a medium adapted to apply a compressive force on the spindle (1-3) so as to lock it around the collet, through a mechanical control member (11-13) which can be manually actuated without physical effort, the system comprising also a device (17-20) for positioning the collet or the tool inside said collet.

Description

"TOOL COLLET SPINDLE LOCKING SYSTEM"
The present invention relates to a locking system for the spindle supporting the
tool collet of machine tools, allowing to apply considerable locking forces with a
minimal effort by operator and therefore is a considerable technical development in
comparison with the presently used systems.
It is known that the tool locking collets must be introduced in the corresponding
spindle seat and are blocked therein by mechanical systems requiring a great effort by
operator and subject to great mechanical strains, so that they undergo wear and all the
mechanical drawbacks normally occurring to severely strained parts.
The system according to the present invention is based on the innovative principle
of providing in the spindle housing a chamber filled with a medium adapted to apply a
compressive force on the spindle, the inner body of which has the form of a double or
single splined cone, so as to lock it around the collet, the compressive force of the
medium being regulated through a mechanical control member which can be manually
actuated by the operator without physical effort.
The system according to the present iivention comprises also a device for
positioning the collet or the tool inside the collet, which can also be actuated by the
operator without physical effort and acting on the spindle positioning piston. The characteristics, objects and advantages of the system according to the present
invention will be also apparent from the following detailed description of a preferred
embodiment, which is given as a non limiting example of the scope of the invention,
reference being had to the accompanying sheet of illustrative drawing, whose single
5 figure is a sectional elevational view of a spindle provided with the locking system of
the present invention.
With reference now to the accompanying drawing, the spindle to be provided with
the system of the present invention may be of any conventional type, and therefore its
housing 1 may comprise at its upper end an adaptor 2 of any size and shape, such as an
0 ISO, Morse taper cone, cylindrical adaptor and so forth. The housing 1 comprises at its
lower end a wide cavity in which there is the inner body 3 of the spindle, so as to lock
in the central seat 4 the collet (not shown) which may also be of any size and shape,
such as round, square, polygonal, said collet supporting in its turn the tool, which may
also be of any conventional size and type.
*-* The inner body 3 of the spindle is being shown in the annexed drawing in the form
of a double convex cone, but it could also be a double concave cone or even a single
concave or conve cone, and is provided with alternate slots for its compression. The
inner body 3 is being held at the lower end by a fixing ring nut 5 and at the upper end
by a closure thrust bearing block 6.
® Above this group there is the thrust bearing ring 7 enclosing the plenum chamber 8
with inner and outer sealing O-Rings 9 and 10, respectively. The plenum chamber 8 is
filled with a medium adapted to apply a compressive force on the inner body 3 of the
spindle through the thrust bearing members 7 and 6. Such a medium is generally an
incompressible fluid such as oil, but it could be any other material, e.g. micropellets. t
^ The pressure of such a medium may be regulated through a little piston 11, inserted in the bushing 12 screwed inside the housing 1, said piston 11 being actuated by the screw
13 on which one can operate from outside with a suitable tool, without any particular
effort of the operator. It is therefore clear that by tightening the screw 13 one
increases the pressure on the spindle body 3 which consequently locks the collet, while
by loosening the screw 13 the collet is unlocked.
The connection between piston 11 and plenum chamber 8 is effected through a
communication hole 14 which may be arranged in any suitable position, as well as the
bleed valve 15 normally provided in any pressurized system.
It is to be particularly pointed out that this locking system might also be arranged 0 in other positions inside the spindle housing and therefore said system could be
arranged aside the spindle inner body or under it, instead above it as shown in the
illustrative drawing for the preferred embodiment of the invention. Such a system may
apply a substantial locking force, e.g. of 6-10 tons or even more.
The system of the present invention may also provide for a positioning device for
5 the collet or preferably for the tool arranged inside the collet. This occurs by moving
downwardly the piston 16 for positioning the spindle (which has a central projection
not visible in the figure, pushing just on the tool bottom) through a recessed central
screw 17, which can also be operated without physical effort by a suitable tool,
actuating a wedge 18, in turn pushing downwardly the inclined plane 19 and therefore
" the piston 16, which is urged back upwardly by the return spring 20. It is clear that this
mechanism with inclined plane might be replaced by other equivalent devices, such as
a worm gear and level gears, clearly without departing from the scope of the
invention, or it could be an oil hydraulic control of the same kind of that devised for
locking the collet.
5 From the foregoing description it can be easily understood that the system of the present invention completely fulfils the stated objects and gives considerable advan¬
tages in locking a tool in the corresponding collet of the spindle, but it has to be understood that several modifications, variations, additions and/or substitutions of elements and details may be resorted to the system of the present invention, without
departing however from its spirit and object, and without falling outside its scope of protection, as it is also defined in the appended claims.

Claims

6 .
1) Locking system for the spindle supporting the tool collet characterized by the
fact of comprising in the spindle housing (1) a chamber (8) filled with a medium
adapted to apply a compressive force on the spindle (1), the inner body (3) of which has
the form of a double or single splined cone, so as to lock it around the collet, the
compressive force of the medium being regulated through a mechanical control
member which can be manually actuated by the operator without any physical effort.
2) Locking system according to Claim 1, characterized by the fact that the
pressure medium is an incompressible fluid such as oil.
3) Locking system according to Claim 1, characterized by the fact that the
pressure medium is a loose material such as micropellets.
4) Loocking system according to Claim 1, characterized by the fact that the
plenum chamber (8) acts on the spindle inner body (3) through a thrust bearing ring nut
(5) and a closure thrust block member (6).
5) Locking system according to Claim 1, characterized by the fact that the plenum
chamber (8) is provided with a bleed valve (15).
6) Locking system according to Claim 1, characterized by the fact that the
pressure regulation in the plenum chamber (8) is effected through a little piston (11)
connected with said chamber (8), the piston being (11) actuated by a screw (13) which
can be manually operated from outside the housing (1) without any physical effort of
the operator, by means of a simple suitable tool.
7) Locking system according to Claim 1, characterized by the fact that the plenum
chamber (8) may be arranged above, aside or under the spindle inner body (3).
8) Locking system according to one or more of the preceding claims, characterized
by the fact of further comprising a device for controlling the tool position inside the collet or the position of said collet, said device acting on the spindle positioning piston
(16).
9) Locking system according to Claim 8, characterized by the fact that said
position controlling device comprises a screw (17) which can be manually operated
5 from outside without operator's effort, acting on a system of inclined plane, wedges
(18) or other mechanical equivalent members, in order to move downwardly the spindle
positioning piston (16), which is urged upwardly by a return spring (20).
10) Locking system according to Claim 8, characterized by the fact that said
position controlling device comprises a worm gear and a pair of bevel gears, which can
° . be actuated by the operator.
11) Locking system according to Claim 8, characterized by the fact that said
position controlling device is an oil hydraulic device having structure and function
similar to those of the main device for locking the collet.
12) Locking system for the spindle supporting the tool collet; substantially as
hereinbefore described and as illustrated in the accompanying drawing, for the above
mentioned objects.
PCT/EP1985/000480 1984-09-21 1985-09-04 Tool collet spindle locking system WO1986001758A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT22769/84A IT1176760B (en) 1984-09-21 1984-09-21 CLAMP HOLDER SPINDLE FOR TOOLS
IT22769A/84 1984-09-21

Publications (1)

Publication Number Publication Date
WO1986001758A1 true WO1986001758A1 (en) 1986-03-27

Family

ID=11200257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1985/000480 WO1986001758A1 (en) 1984-09-21 1985-09-04 Tool collet spindle locking system

Country Status (5)

Country Link
EP (1) EP0194294A1 (en)
DD (1) DD237806A5 (en)
IT (1) IT1176760B (en)
PL (1) PL147436B1 (en)
WO (1) WO1986001758A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272730A1 (en) * 1986-12-05 1988-06-29 KOWAL TOOLS di MOLTENI Cornelio System for locking the collet spindle for tools
US6224067B1 (en) * 1997-01-28 2001-05-01 Etp Transmission Ab Hydromechanical chuck
WO2013026444A3 (en) * 2011-08-24 2013-04-18 Gühring Ohg Chuck

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890056A (en) * 1957-06-27 1959-06-09 John J Parker Ball actuated expansible arbor
CH382517A (en) * 1961-02-28 1964-09-30 Fraisa Ag Jig
GB1035395A (en) * 1964-06-23 1966-07-06 Herbert Ltd A Holder for supporting a tool in a machine tool
DE1552269A1 (en) * 1966-11-15 1969-12-18 Eggli Weibel S A Jig
CH495804A (en) * 1969-01-30 1970-09-15 Stieber & Nebelmeier Fa Chuck for end mills with a cylindrical shank
DE2305768A1 (en) * 1973-02-07 1974-08-15 Franken Fabrik Fuer Praezision SELF-CLAMPING TOOL CHUCK WITH STOP BODY AXIALLY ADJUSTABLE THROUGH SCREWS

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890056A (en) * 1957-06-27 1959-06-09 John J Parker Ball actuated expansible arbor
CH382517A (en) * 1961-02-28 1964-09-30 Fraisa Ag Jig
GB1035395A (en) * 1964-06-23 1966-07-06 Herbert Ltd A Holder for supporting a tool in a machine tool
DE1552269A1 (en) * 1966-11-15 1969-12-18 Eggli Weibel S A Jig
CH495804A (en) * 1969-01-30 1970-09-15 Stieber & Nebelmeier Fa Chuck for end mills with a cylindrical shank
DE2305768A1 (en) * 1973-02-07 1974-08-15 Franken Fabrik Fuer Praezision SELF-CLAMPING TOOL CHUCK WITH STOP BODY AXIALLY ADJUSTABLE THROUGH SCREWS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272730A1 (en) * 1986-12-05 1988-06-29 KOWAL TOOLS di MOLTENI Cornelio System for locking the collet spindle for tools
US6224067B1 (en) * 1997-01-28 2001-05-01 Etp Transmission Ab Hydromechanical chuck
WO2013026444A3 (en) * 2011-08-24 2013-04-18 Gühring Ohg Chuck

Also Published As

Publication number Publication date
IT8422769A0 (en) 1984-09-21
PL147436B1 (en) 1989-06-30
IT8422769A1 (en) 1986-03-21
EP0194294A1 (en) 1986-09-17
PL255439A1 (en) 1986-07-15
DD237806A5 (en) 1986-07-30
IT1176760B (en) 1987-08-18

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