WO1999024201A1 - Procede et dispositif d'usinage d'un trou traversant - Google Patents

Procede et dispositif d'usinage d'un trou traversant Download PDF

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Publication number
WO1999024201A1
WO1999024201A1 PCT/IL1998/000533 IL9800533W WO9924201A1 WO 1999024201 A1 WO1999024201 A1 WO 1999024201A1 IL 9800533 W IL9800533 W IL 9800533W WO 9924201 A1 WO9924201 A1 WO 9924201A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
bore
duct
imparting
machining
Prior art date
Application number
PCT/IL1998/000533
Other languages
English (en)
Inventor
Miron Kaganovich
Original Assignee
Flying Tools 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 Flying Tools Ltd. filed Critical Flying Tools Ltd.
Priority to EP98951656A priority Critical patent/EP1045738A1/fr
Priority to AU97592/98A priority patent/AU9759298A/en
Publication of WO1999024201A1 publication Critical patent/WO1999024201A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/06—Driving main working members rotary shafts, e.g. working-spindles driven essentially by fluid pressure or pneumatic power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G9/00—Working screws, bolt heads, or nuts in conjunction with thread cutting, e.g. slotting screw heads or shanks, removing burrs from screw heads or shanks; Finishing, e.g. polishing, any screw-thread
    • B23G9/001—Working screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/26—Fluid-pressure drives
    • B23Q5/261—Fluid-pressure drives for spindles

Definitions

  • the present invention relates to the field of machining through-going bores within a workpiece by means of a cutting tool. More particularly, the present invention refers to serm-fmisr-ing and/or finishing machining operations in which a cutting tool performs an operative linear motion associated with the advancing thereof through the workpiece with simultaneous rotation of the tool about the bore axis.
  • An example of such an operation is the threading of internal threads by virtue of a tap. It should be understood, however, that the present invention is not limited to the internal threading operation and can be also implemented in other machining operations such as drilling, counter-boring, reaming, internal roll burnishing, and piercing, etc.
  • Such a machine usually comprises an elongated tap with a tap shank and a threaded screw cutting portion, a tap driving means for imparting rotary movement to the tap and a means for imparting relative reciprocating linear motion to the tap along the bore axis within the machined blank.
  • the reverse motion of the tap is eliminated by virtue of imparting auxiliary motion to the tap after completing each stroke outside the bore.
  • the tap resides within a first rotating hollow spindle provided with internal thread for initiating linear motion of the tap by virtue of self winding.
  • a second rotating hollow spindle residing opposite to the first one and receiving the tap's forward end after it has passed the bore.
  • the second spindle is also provided with internal thread to further advance the tap through the bore, also by virtue of self-winding.
  • Both hollow spindles are in communication with a closed hydraulic system comprising a duct connecting between the bore's exit and entrance.
  • a pressurized hydraulic medium is supplied to the duct under pulsating pressure and propels the tap after completing the stroke to its initial position, ready for the next cycle.
  • the other disadvantage of the prior art device employing self winding for advancing the tap is associated with the fact that the pitch of tapped thread depends on the pitch of the spindle's thread. Therefore, if the variation of the pitch of tapped thread is required, the machining operation should be terminated so as to replace both hollow spindles. It can be readily appreciated that periodical termination of the machining operation makes the automation of such a process difficult and requires additional labor.
  • An additional shortcoming of the prior art device is associated with the employing of a pulsating pressurized fluid for propelling the tap. In order to propel the tap through the duct, the hydraulic system supplying such a fluid should be capable of developing sufficient pressure. Therefore, it makes difficult, if not impossible, the implementation of such a device as a compact manual tool.
  • the object of the present invention is to provide for a new and improved method of machining through-going bores and a device for its implementation which will sufficiently reduce or overcome the above mentioned drawbacks of the prior art methods and devices.
  • the main object of the present invention is to provide for a new and improved method for machining of through-going bores which is not limited by the pushing force advancing the tool along the bore and thus enabling reliable macl ⁇ iing of a wide range of workpiece materials.
  • a further object of the present invention is to provide for a new and improved method of machining through-going bores which can be easily automated, does not require powerful hydraulic systems and can be easily implemented in a compact and simple device suitable both for manual and machine operation.
  • Still a further object of the present invention is to provide for a new and improved method machining of through-going bores and a device for its implementation which operates continuously by virtue of easy evacuation of the cutting chip without its accumulation on the tool during machining.
  • the above and other objects and advantages of the present invention can be achieved in accordance with the following combination of its essential features, referring to different embodiments thereof. These embodiments can be attributed to two independent groups, one of which refers to a method of machining, the other to disparate devices implementing this method.
  • One of the embodiments refers to a method of machining a through-going bore within a workpiece by means of a cutting tool. The method comprises the following steps: 4
  • said force is applied to said tool by a pushing means capable of periodical advancing towards the tool so as to impart thereto said operative linear motion or retracting from said tool, so as to enable propelling said tool to said first position.
  • said fluid supplied to said duct is a mixture of compressed air and a coolant.
  • said mixture is supplied to said duct through said pushing means.
  • the pressure of said fluid capable of propelling said tool is not equal to the pressure of said fluid capable of advancing and retracting said pushing means.
  • said machining is a threading operation and said cutting tool is a tap suitable for cutting of the internal thread in said bore.
  • Said means for imparting the auxiliary motion comprises a source of pressurized fluid, said source being capable of supplying said fluid into said duct under constant, non-oscillating pressure.
  • said means for imparting the operative linear motion comprises a pushing means and a source of pressurized fluid capable of periodically advancing said pushing means towards said tool or to retract thereof from said tool.
  • said pressurized fluid supplied into said duct is a mixture of compressed air and a coolant, said mixture being supplied under constant non-oscillating pressure of 1-2 atmospheres.
  • said pushing means comprises a pushing rod residing within a hydraulic cylinder connected to the source of pressurized fluid.
  • said pushing rod is formed as a tubular element connected to the source of said mixture.
  • said source of pressurized fluid is capable of supplying to said hydraulic cylinder compressed air under pressure of at least 3 atmospheres.
  • said means for rotation of the tool about the bore axis comprises a motor and a hollow spindle member driven by said motor, the interior of said spindle member conforming the shape of said tool so as to enable imparting thereto rotation and operating linear motion.
  • the device is mounted on a machine tool and said means for rotation of the tool about the bore axis is driven by a spindle of said machine tool.
  • said cutting tool is a tap suitable for cutting the internal thread into said through-going bore.
  • the additional preferred embodiment of a device for machining a through-going bore within a workpiece comprises:
  • the additional preferred embodiment of a device for machining a through-going bore within a workpiece comprises:
  • a table provided with at least one work station equipped with a hollow spindle carrying a cutting tool suitable for machining said bore, - a rotation means capable of rotating said spindle so as to impart to said tool rotation motion about the axis of the bore,
  • Said means for imparting the auxiliary motion comprises a source of pressurized fluid, said source being capable of supplying said fluid into said duct under constant, non-oscillating pressure.
  • said table is equipped with work stations which carry cutting tools suitable for a variety of machining operations.
  • Fig.1 shows a side view of a device in accordance with the present invention.
  • Fig.2 shows a top view of a device in accordance with the present invention.
  • Fig.3a,b show, respectively, the pushing means in the forward-most and rear-most positions.
  • Fig.4 presents a cross-section A-A of fig.1.
  • Fig.5 presents an alternative embodiment of a device in accordance with the present invention including a revolving table equipped with several work stations.
  • Figs.6,7 show two side views of a device in accordance with the present invention when it is coupled with a drilling machine.
  • a device 10 in accordance with the present invention, which comprises a housing 1 with a hollow spindle 2 residing therein, mounted with the possibility of rotation by virtue of bearings 3.
  • the interior of the spindle conforms to the exterior of a cutting tool, so as to enable their joint rotation when the tool resides therein.
  • the tool can pass the interior of the spindle so as to advance towards a workpiece W provided with a through-going bore 5 to be machined.
  • the workpiece can be fed automatically from a chute (not shown) or by any other suitable feeding means.
  • a cutting tool 4 which is a tap is used.
  • the tap comprises a threaded screw portion provided with interposing flutes for the evacuation of chips generated during machining.
  • the present invention is not limited by internal threading and can be equally employed for performing any other machining operation which employs the similar linear operative motion of a cutting tool.
  • a machining operation one can mention the increasing of the bore's diameter by a drill, reaming by a reamer, etc.
  • an electric motor 6 used for rotating the hollow spindle.
  • the rotation moment is transferred from the motor by a driving wheel 7, a belt 8 and a driven wheel 9, rigidly coupled with the spindle by virtue of a screw 11.
  • the tap moves through the bore only during the operative linear motion.
  • the tap is reversed to the initial position by virtue of a dedicated auxiliary motion taking place outside the threaded bore.
  • the housing is provided with an elongated entrance portion 12 having a through-going opening 13 which communicates with the interior of the hollow spindle.
  • a hollow duct 14 connecting between the entrance portion and the exit of the threaded bore .
  • the inner diameter of the duct and of the entrance portion slightly exceeds the outside diameter of the tap so as to enable its free passage through the duct and through the housing.
  • the duct is connected with a source of pressurized fluid capable of propelling the tap through the duct.
  • the tap when the tap is about to leave the bore in the end of a stroke it enters the duct and from this point the tap is propelled through the duct by the pressurized fluid until it reaches the entrance portion of the housing, passes through it and returns to the initial position within the hollow spindle ready to begin a new stroke.
  • the advancing of the tap through the bore in the course of the operative linear motion is carried out by virtue of an external force applied to the rear portion of the tap.
  • a pushing rod 15 is provided. It is aligned and coaxial with the through-going opening 13 made in the housing
  • the pushing rod is provided with a piston 16 and resides within a hydraulic cylinder 17 communicating with the source of pressurized fluid 18.
  • the pressurized fluid for example, compressed air
  • the pressurized fluid is supplied to the cylinder via a regulating valve 19 enabling changes in air pressure, and thus to control the force applied by the pushing rod to the tap.
  • the pressure of compressed air supplied to the cylinder is about 3 atmospheres.
  • a control means 20 for example a double acting piston is provided, which enables connection of the source of pressurized fluid either to the forward or rear extremity of the cylinder, and co ⁇ espondingly, to retract the rod from the tap or to push it towards the tap.
  • the pushing rod is formed as a tubular element, whose interior 21 is in communication with a source of pressurized fluid 22 capable of supplying thereof under constant non oscillating pressure.
  • the pressurized fluid passes the entrance portion of the housing, reaches the hollow spindle and is capable of propelling the tap via duct 14.
  • a suitable pressurized fluid one can use compressed air mixed with a coolant.
  • a source of coolant 23 can be installed within a line connecting the source of pressurized fluid 22 and the rod.
  • the source 22 should be capable of supplying the fluid to the duct during the machining cycle under constant non-oscillating pressure of 1-2 atmospheres. It should be understood, however, that if the machining cycle is paused, for example, for maintenance or for replacement of the workpiece, the source of pressure can be cut off and supply of the fluid to the pushing rod can be temporarily terminated.
  • the entrance portion of the housing is formed with a port 24 for evacuation of chips generated during the machining operation.
  • the mixture of coolant and compressed air which is supplied to the pushing rod passes through the rod's interior, proceeds to the hollow spindle and exits therefrom outside. At the exit from the spindle the stream of pressurized mixture pushes forward the cutting chips which could have accumulated during the threading stroke. It is not shown specifically, but should be appreciated that the chip is followed by the tap and they are propelled together via the duct. When the chip reaches the entrance portion of the housing it can be evacuated therefrom via port 24 .
  • control means 20 By virtue of control means 20 the supply of compressed air from source 18 is now switched to the frontal extremity of the cylinder. This causes retracting of the pushing rod from the forward position to the rear position as shown in fig.3b.
  • the new workpiece W is fed into the work position and is ready for threading.
  • the pushing rod no longer blocks the through-going opening of the entrance portion 12 and therefore communicates with the duct.
  • the stream of pressurized fluid circulating within the duct can now bring the tap into its initial position within the spindle so as to begin the operative linear motion associated with the new threading cycle.
  • fig.3 b one can see the tap pushed into the spindle by the mixture of compressed air and coolant supplied to the duct via interior 21 of the pushing rod from source 22. When the tap resides within the spindle it is brought into rotating motion and is ready for advancement towards the bore of the workpiece.
  • gap G between the spindle interior and the tap the stream of pressurized fluid flowing through the spindle's interior enables self-centering of the tap thus ensuring coaxial disposition of the tap with respect to the bore's axis. It can be readily appreciated that due to the self- centering of the cutting tool the accuracy of machining operation is improved.
  • Example 1 The internal thread M8 with 7 mm depth was cut in nuts made of Aluminum- 12%Si alloy. The thread was cut by a tap made from high speed steel.. The constant non-oscillating pressure of 1.2 atmospheres was employed for propelling the tap through the duct. 11
  • the pressure of compressed air supplied to the hydraulic cylinder was 3 atmospheres.
  • the rotational velocity of the spindle was 2000 rpm.
  • the tap's tool life from re-sharpening to re-sharpening was 140000 nuts. The same operation was carried out in the traditional tapping machine employing reverse of the tap through the bore.
  • the rotational velocity of the spindle was 680 rpm and the tap's tool life was 1400- 1500 nuts.
  • Fig.5 shows an embodiment of a device in accordance with the present invention provided with a worktable 25 formed as a turret carrying work stations 26,27,28,29 each of which is equipped with a hollow spindle 36,37,38,39 coupled with a pulley 46,47,48,49 similar to that described above in connection with a device provided with a sole work station.
  • the worktable is provided with a revolving means (not shown) capable of revolving the table about its axis and to bring the selected work station to a position in which its hollow spindle can be operatively coupled with a hollow duct and with a means for imparting to the tool operative linear motion accompanied by simultaneous rotation (now shown).
  • Fig. 5 shows the work station 28 brought to a position where its hollow spindle 38 receives rotation moment from pulley 48 driven by a belt 8.
  • Each of the work stations can be provided with a disparate cutting tool so as to perform a variety of machining operations in a workpiece.
  • Fig. 5 also shows a work station 26 equipped with a tap 56, work station 27 with a drill 57, work station 28 with a coarse drill 58 and work station 29 with a reamer 59.
  • rotation of the hollow spindle imparting rotation motion to the cutting tool was effected by a dedicated autonomous rotation means, for

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Drilling And Boring (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un trou traversant (5) dans une pièce à usiner (W), et un dispositif (10) de mise en oeuvre dudit procédé. Ce procédé est approprié à des opérations d'usinage de semi-finition ou de finition de trous traversant ou d'alésages, notamment le taraudage de filets internes, le perçage, la formation d'avant-trous, l'alésage, le polissage par rouleau et le poinçonnage, etc. Ce procédé consiste à conférer à l'outil de coupe (4) un déplacement linéaire fonctionnel, accompagné d'une rotation dudit outil autour de l'axe du trou (5), et à conférer audit outil un déplacement auxiliaire associé à la propulsion de celui-ci vers la position initiale, après exécution de chaque course. La propulsion de l'outil est effectuée à l'extérieur du trou (5), à travers un conduit (14) placé entre l'entrée et la sortie du trou (5). Etant donné qu'on évite la friction associée au déplacement linéaire arrière de l'outil (4) à travers le trou (5), il est possible de réduire l'usure de l'outil de coupe (4), d'améliorer sa durée de vie et d'augmenter la productivité de la machine.
PCT/IL1998/000533 1997-11-11 1998-11-04 Procede et dispositif d'usinage d'un trou traversant WO1999024201A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98951656A EP1045738A1 (fr) 1997-11-11 1998-11-04 Procede et dispositif d'usinage d'un trou traversant
AU97592/98A AU9759298A (en) 1997-11-11 1998-11-04 A method and device for machining a through bore

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL12216997A IL122169A0 (en) 1997-11-11 1997-11-11 A method for machining a through-going bore and a device for the implementation of said method
IL122169 1997-11-11

Publications (1)

Publication Number Publication Date
WO1999024201A1 true WO1999024201A1 (fr) 1999-05-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1998/000533 WO1999024201A1 (fr) 1997-11-11 1998-11-04 Procede et dispositif d'usinage d'un trou traversant

Country Status (4)

Country Link
EP (1) EP1045738A1 (fr)
AU (1) AU9759298A (fr)
IL (1) IL122169A0 (fr)
WO (1) WO1999024201A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104175061A (zh) * 2013-05-24 2014-12-03 中国核工业第五建设有限公司 反应堆压力容器支撑用高精度沉头盲孔制作工艺
CN113385715A (zh) * 2021-07-30 2021-09-14 重庆市玉叶厨具有限公司 液压共享式锅具打孔系统及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668726A (en) * 1969-01-20 1972-06-13 Katsumi Shinjo Automatic nut-tapping apparatus
US4338694A (en) * 1980-05-20 1982-07-13 Multifastener Corporation Fastener orienting, tapping and collection system
US4861201A (en) * 1985-09-19 1989-08-29 Societe Francaise D'etudes Et De Realisation D'outillage Quick change adapter with a torque limiter for a tapping chuck
US5086532A (en) * 1985-05-28 1992-02-11 Mark Hattan Methods and apparatus for forming fasteners and threaded connections
US5199927A (en) * 1992-01-15 1993-04-06 Rubin Shlomo Z Bent shank nut tapping method and apparatus
US5507694A (en) * 1993-02-16 1996-04-16 Nutap Schuhl & Co. Gmbh Pass-over tapping apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668726A (en) * 1969-01-20 1972-06-13 Katsumi Shinjo Automatic nut-tapping apparatus
US4338694A (en) * 1980-05-20 1982-07-13 Multifastener Corporation Fastener orienting, tapping and collection system
US5086532A (en) * 1985-05-28 1992-02-11 Mark Hattan Methods and apparatus for forming fasteners and threaded connections
US4861201A (en) * 1985-09-19 1989-08-29 Societe Francaise D'etudes Et De Realisation D'outillage Quick change adapter with a torque limiter for a tapping chuck
US5199927A (en) * 1992-01-15 1993-04-06 Rubin Shlomo Z Bent shank nut tapping method and apparatus
US5507694A (en) * 1993-02-16 1996-04-16 Nutap Schuhl & Co. Gmbh Pass-over tapping apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104175061A (zh) * 2013-05-24 2014-12-03 中国核工业第五建设有限公司 反应堆压力容器支撑用高精度沉头盲孔制作工艺
CN113385715A (zh) * 2021-07-30 2021-09-14 重庆市玉叶厨具有限公司 液压共享式锅具打孔系统及方法

Also Published As

Publication number Publication date
IL122169A0 (en) 1998-04-05
EP1045738A1 (fr) 2000-10-25
AU9759298A (en) 1999-05-31

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