US3526161A - Combination of lathe and thread-cutting attachment - Google Patents

Combination of lathe and thread-cutting attachment Download PDF

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Publication number
US3526161A
US3526161A US736483A US3526161DA US3526161A US 3526161 A US3526161 A US 3526161A US 736483 A US736483 A US 736483A US 3526161D A US3526161D A US 3526161DA US 3526161 A US3526161 A US 3526161A
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Prior art keywords
attachment
slide
stop
slider
carriage
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Expired - Lifetime
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US736483A
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English (en)
Inventor
Josef Birgmayer
Karl Husarik
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Voestalpine AG
Voest AG
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Voestalpine AG
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    • 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
    • B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
    • B23Q16/006—Equipment for precise positioning of tool or work into particular locations not otherwise provided for positioning by bringing a stop into contact with one of two or more stops, fitted on a common carrier
    • 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
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/02—Thread cutting; Automatic machines specially designed therefor on an external or internal cylindrical or conical surface, e.g. on recesses
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/20—Lathe for screw cutting

Definitions

  • a carriage is mounted on a lathe bed and movable in a longitudinal direction relative to said bed.
  • a cross slide is mounted on said carriage and movable relative to said carriage transversely to said longitudinal direction.
  • Carriage drive means are mounted on said bed and operable to move said carriage relative to said bed in said longitudinal direction.
  • An attachment base is mounted on said cross slide.
  • An attachment slide is slidably mounted on said attachment base for advancing and withdrawing movements, which are transverse to said longitudinal direction.
  • a tool is carried by said attachment slide.
  • a huid-operable piston motor is carried by said attachment base and operable to impart an advancing movement to said attachment slide.
  • a stop roll is rotatably mounted on said attachment base and formed with a plurality of angularly spaced radial bores. A plurality of stop screws screws are axially adjustably mounted in respective ones of said bores.
  • a ratchet is coupled to said roll.
  • An actuating pawl is coupled to said attachment slide and adapted to impart an incremental angular movement to said ratchet in response to a withdrawing movement of said attachment slide.
  • Said roll is rotatable by said pawl and ratchet to successive angular positions, in which successive ones of said stop screws are in the path of the advancing attachment slide and limit the advancing movement thereof.
  • a plunger is carried by said attachment base and extends and is movable relative thereto in said longitudinal direction and arranged normally to move in unison with said attachment base.
  • a rod is carried by said ⁇ bed and extends in said longitudinal direction.
  • Two stops' are carried by said rod and adjustable along the same. Said stops extend into the path of said plunger and are arranged to move said plunger relative to said attachment base when said carriage is moving in said longitudinal direction while said plunger is in engagement with one of said stops on said rod.
  • Means comprising an admission control switch are provided for controlling the admission of lluid to said piston motor.
  • Said admission control switch is arranged to be actuated in response to said movement of said plunger relative to said attachment base.
  • a carriage drive'control switch is actuable by said attachment slide and arranged to initiate a forward movement of said carriage in response to an advancing movement of said attachment slide and a rearward movement of said carriage in response to a withdrawing movement of said attachment slide.
  • This invention relates to an automatic thread-cutting attachment to be mounted on the carriage of a lathe.
  • a known attachment of this kind is driven by a universal joint shaft connected at its input end to the tailstock end of the lead screw of a center lathe.
  • all movements which are required are controlled and performed by a ratchet wheel cooperating with camwheels.
  • diterent camwheeels of an appropriate size and shape 3,526,161 Patented Sept. 1, 1970 ice must be used for cutting threads having different lengths and that the maximum length of the threads which can be cut is restricted because camwheels exceeding a certain size cannot be accommodated.
  • the depth of cut is always the same in all successive cutting operations so that it is not possible to select a large depth for the iirst cut and progressively decreasing depths for the successive cuts although this would be desirable for a reduction of the machining time and for an improvement of the surface nish of the side faces of the threads.
  • 'Ihe known attachment has also the disadvantage that the tool cam be withdrawn when the thread-cutting operation has been; completed but does not automatically return to the initial position for the rst cut and that the attachment must be deenergized by hand.
  • the entire attachment is mounted on the carriage of the lathe in such a manner that the attachment would obstruct other operations to be performed on the lathe so that the attachment must be removed before the lathe is available for other turning operations.
  • VIt is an object of the invention to eliminate these disadvantages and provide an automatic thread-cutting attachment in which the number of cuts desired in cutting a screw thread and the depth of each cut can be selected as desired, the length and lead of the thread are not limited except by limits imposed by the lathe itself, the attachment automatically returns to the initial position for the first cut of the next thread and is then automatically stopped when a thread has been completed, and the attachment does not obstruct other turning operations when out of use.
  • an attachment base is adapted to be secured to the cross slide mounted on a carriage, which during thread cutting is moved in the usual manner by the' lead screw, said attachment base carries an attachmentv slide, which carries the tool and is adapted to be advanced toward the workpiece transversely to the axis thereof by a hydraulic or pneumatic piston motor and to be withdrawn to its initial position preferably by spring force,
  • the attachment base also carries a stop roll or the like member, which is provided with a plurality of angularly spaced radial bores for receiving adjustable stop screws, said roll is incrementally rotatable with the aid of a ratchet and an actuating pawl, which s actuated by the attachment slide as the latter returns, said stop screws are successively moved by said rotation to operative positions'in which they limit the advance of the carriage
  • the bed or headstockof the lathe carries a rod orvthe like member, which is parallel to the spindle and carries two stops, which are adjustable to the desired length of the thread
  • a plunger is associated with said stops and extends parallel to the rod or the like member and is adapted to be displaced when striking either ofthe two stops so as to actuate a switch for controlling the admission of pressure to the piston motor, and another switch is provided which acts on the means for driving the carriage and is movable by the carriage and arranged to initiate a forward movement of the carriage in response to an advance of the attachment slide
  • a movement parallel to the axis of the workpiece is imparted to the tool by the lead screw, which moves the carriage.
  • the attachment slide causes the tool to perform the advancing and withdrawingmovement otherwise imparted to the tool by the cross slide.
  • the advancing movement of the* attachment slide is limited by the stop screws of the stop roll. As the stop screws are adjustable in the radial bores, the advancing movement of the attachment slide and with it the advanced position of the tool and the depth of cut can be varied.
  • the stop roll is rotated by means of the actuating pawl and the ratchet to move the next stop screw into operative position. Dilerent depths can thus be selected for individual cuts.
  • the number of stop screws which are used in cutting one thread will depend on the number of cuts desired for the screw thread.
  • An automatic sequence of operations is enabled by the two switches. When the plunger strikes at the end of a cut the stop at the headstoek end of the rod which is parallel to the lead screw, the switch actuated by the plunger interrupts or reverses the admission of pressure to the piston motor to initiate the withdrawing movement of the attachment base and tool.
  • the attachment base During the withdrawing movement of the attachment base, the latter acuates the second switch, which initiates a rearward movement of the means for driving the carriage so that the tool returns to its initial position.
  • the irst switch is actuated to reverse the piston motor so as to advance the attachment slide, the latter then changes over the second switch to initiate a forward movement of the carriage, and the next cut begins.
  • the length of the advancing movement of the attachment slide has now been changed because the stop roll was rotated during the withdrawing movement of the attachment slide and the advancing movement of the attachment slide is now limited by another stop screw.
  • the length of the thread can be adjusted by means of the stops which are adjustably mounted on the rod which is parallel to the lead screw.
  • the entire attachment is relatively simple in structure and has the great advantage that special camwheels of other replaceable parts are not required for a cutting of threads differing in length and lead and for dilerent depths of cut.
  • a development of the invention resides in that the stop roll or the like member is biased by a return spring and is adapted to be held in its various angular positions against the tension of the return spring by balls or the like detent elements, which are resiliently urged into detent openings corresponding to said angular positions, the detent spring acting on the ball or the like detent element bears on a slider, which is adapted to be locked in either of two positions, said slider is articulatedly connected to the actuating pawl so as to provide for a freedom of movement of the latter and in response to the withdrawal of the attachment slide after the last is automatically movable with the aid of a trip pin, which is insertable into the stop roll or the like and causes the slider to assume a position in which the detent spring no longer holds the ball or the like detent member in the respective detent opening and the actuating paw
  • the stop roll When the slider is moved the second position from the position in which the *ball is urged into the detent opening and in which the actuating pawl engages the ratchet wheel, the stop roll will no longer be held against rotation and will be reversely rotated by the return spring to the initial position, in which the first stop stop screw is in operative position.
  • the slider actuates a switch which is included in the circuit in such a manner that the entire means for driving the attachment are deenergized as soon as the switchV which is actuated by the plunger is changed over at the end of the rearward movement of the carriage.
  • the attachment slide When the attachment is reenergized, the attachment slide will engage the iirst stop screw so that the tool is in position for the irst 4l cut and the iirst cut of a new thread is initiated. All returning operations are initiated with the aid of the release pin and the latter may be inserted at a selected point of the stop roll or the like to determine the time when deenergization will be effected.
  • means for moving the slider to the position for releasing the stop roll or the like member comprise a pusher arm, which is parallel to the slider and in response to the withdrawing movement of the attachment slide is moved against the force of a spring by a run-up cam, and a lever, which is pivoted to the pusher arm and articulatedly engages the slider and bears on the trip pin from time to time so as to form a fulcrum, whereas the means for returning the slider comprises another lever, which is pivotally, movable, also by a run-up cam, in response to the advancing movement of the attachment slide.
  • stop roll and the ratchet are coaxial and preferably integral and the detent openings extend axially and are disposed between the radial bores for the stop screws and the ratchet teeth and radial bores for selectively receiving the trip pin are provided on another peripheral circle.
  • the entire attachment is mounted according to the invention on the cross slide at that end thereof which is opposite to the crank handle for moving the cross slide. It will lthus be opposite to the normal station of the lathe operator and will not interfere with other turning operations.
  • the stops on the rod which is parallel to the lead screw may be pivotally movable to a position in which they do not limit lthe carriage movement.
  • FIG. 1 is a diagrammatic top plan view showing an automatic thread-cutting attach-ment and FIG. 2 is a vertical sectional view taken on line II-II in FIG. 1.
  • the attachment base 1 is mounted on the cross slide (not shown) of a center lathe at that end of said cross slide which is remote from the crank handle for moving said cross slide.
  • An attachment slide is movable transversely to the axis of the workpiece 4 and guided on the attachment base.
  • the attachment slide 5 carries a tool holder 2, which is provided with a tool 3.
  • the attachment slide is displaceable by a hydraulic piston motor, which consists of a cylinder 6 and a piston 7.
  • the cylinder 6 is mounted on the attachment base 1.
  • the piston 7 is biased by a compression spring 8 and has a piston rod 9, which is connected to the attachment slide 5.
  • a double poppet valve 10 serves to control the piston motor.
  • a stop roll 11 is ⁇ rotatably mounted on a vertical axis on the attachment base 1.
  • the stop roll 11 has a multi- -plicity of angularly spaced radial bores 12 for receiving adjustable stop screws 13 and at its lower end carries ratchet teeth 14.
  • detent openings 16 are provided on one peripheral circle and radial bores 17 for selectively receiving a headed trip pin 18 on a higher peripheral circle.
  • a return spring 19 acts by a pulling cable on the stop roll 11 and tends to reversely rotate the latter to an initial position, which is defined by stops 20.
  • a lever 21y ⁇ is connected to the base 1 by a pivot 22.
  • An actuating pawl 23 is pivoted to the lever 21 and engages the ratchet teeth 14.
  • a spring 24 urges the actuating pawl into the spaces Vbetween the ratchet teeth.
  • Another spring 25 biases the lever 21.
  • a run-up cam 26 swings the lever 21 in a counterclockwise sense so that the stop roll 11 is advanced one tooth in the clockwise sense. In each angular position, the stop is held against the tension of the return spring 19 because a spring 28 urges a ball 27 into the respective detent opening 16.
  • a detent device 30 can lock the slider 29 in either of two positions. When the slider 29 is displaced to the second position to the right from the position shown in FIG.
  • the force of the spring 28 will no longer be suicient to urge the ball 27 into the respective detent openings 16.
  • the actuating pawl 23 is lifted from the ratchet teeth 14 because a pin 31 carried by the pawl enters a window of the slider 29 so that the actuating pawl has sufcient freedom of movement when the slider is in its left-hand position whereas the slider in its right-hand position engages the pin to hold the pawl spaced from the ratchet teeth.
  • the stop roll 11 is reversely rotated by the return spring 19 into the initial position, which is defined by the stops 20.
  • the slider 29 is displaced by a pusher arm 32, which ',is parallel to the slider andduring the withdrawing movement of the attachment slide ⁇ 5 is displaced by a run-up cam 26a to the left, toward the stop roll, against the force of a spring 33.
  • a lever 34 is pivoted to the pusher arm-32 and slidably pivoted to the slider 29.
  • the lever 34 carries approximately at its center an upstanding pin 35. During a displacement of the pusher arm 32, the lever 34 is ⁇ swung -about its point of engagement on the slider 29, but the latter is not displaced thereby.
  • the slider-29 is returned by a, pivoted lever 35, which is swung in the clockwise sense by a run-up cam 26b duringthe advance of the attachment slide.Also during the advance of the attachment slide, the lever 21 is swung under the action of the spring 25 so that the actuating pawl 23 engages the next ofthe ratchet teeth 14.
  • the mode of operation of the attachment is as follows: It is assumed that the carriage and with it the attachment are in their initial position, in which the tool 3 is withdrawn from the workpiece 4 and is spaced in the direction of the workpiece laxis from the workpiece toward the tailstock.
  • a start key is depressed to initiate the automatic thread-cutting sequence.
  • the valve 10 now connects the pressure line to the cylinder 6, the piston 7 is displaced against the force of the spring 8 so that the attachment slide 5 is advanced until its stop part 44 engages the first stop screw 13 of lthe stop roll 11, which is also in its initial position.
  • the -switch 42 initiates the forward movement of the carriage so that the rst cut is taken. At the end of this cut, the plunger strikes the stop 38 and is displaced to actuate the switch 41 so that the valve 10 is moved to the position in which the cylinder 6 is connected to exhaust.
  • spring 8 is now effective to withdraw the entire attachment slide 5.
  • the run-up cam 26 swings the lever 21 and with it the actuating pawl 23 so that the stop roll 11 is advanced one tooth with the aid of the ratchet teeth y14, and the next stop sc'rew 13 assumes an operative position.
  • the run-up cam 26C operates the switch 42 to initiate the rearward movement of the carriage.
  • the pusher arm 32 is displaced by the run-up cam 26a but this displacement does not affect the slider 29.
  • the rearward movement of the carriage is limited in that the plunger 40 strikes the stop 39.
  • the resulting displacement of the plunger causes a shifting of the switch 41 and of the valve 10.
  • the latter now connects the cylinder 6 to the pressure line so that the attachment slide 5 is again advanced and the switch 42 initiates the forward movement of the carriage.
  • its stop 44 strikes the second stop screw, which is now in operative position.
  • the second screw is spaced by any desired angle from the first so that the tool is advanced further and a new c-ut having a selected thickness is taken.
  • the pusher arm 32 and the lever 34 return to their initial position.
  • the spring 25 urges the lever 21 to engage the actuating pawl 23 with the next ratchet tooth.
  • the plunger 40 strikes the stop 38 so that the switch 41 and valve 10 are shifted to initiate the withdrawing movement of the attachment slide, whereas. the switch y42 initiates the rearward movement of the A rod 37 extending parallel to the lead screw is mountedv onpthe bed or headstock of the lathe and carries two adjustable stops 38, 39. A plunger 415 ⁇ for actuating a switch 41 is associated with these stops.
  • the plunger 40 shifts the switch 41 so that ther-valve 10 exhausts pressure uid from the cylinder 6 and the spring 8 can withdraw the attachment slide 5 from the workpiece.
  • valve 10 is shifted to admit pressure to the piston 7 so that that attachment slide is advanced until its stop 44 engages the first stop screw 13.
  • the cross slide mounted on the carriage is now advanced until the tool 3 just contacts the periphery of the workpiece 4.
  • a dial gage 45 is secured to the attachment slide in such a manner that it gives a Zero reading when contacting the attachment base 1.
  • the carriage is now moved toward the tailstock until the tool is spaced to some extent from the workpiece.
  • the cross slide is then further'advanced toward the workpiece by an amount which corresponds to the depth desired for the iirst cut or the first stop screw, which is in operative position, is adjusted by such amount.
  • the plunger 40 is then manually reciprocated to rotate the stop roll as described hereinbefore to the next angular position, in which the second stop screw is in operative position.
  • This stop screw is now adjusted with the aid of the dial gage 45 to the depth desired for the second cut.
  • the procedure is repeated until stop screws in a number which corresponds to the desired number of cuts have been adjusted to the respective depths of such cuts.
  • the trip pin 18 is inserted into the radial bore 17 which is associated with the last stop screw. Now the attachment is ready for operation.
  • carriage drive means mounted on said bed and operable to move said carriage relative to said bed in said longitudinal direction
  • attachment slide slidably mounted on said attachment base for advancing and with drawing movements, which are transverse to said longitudinal direction
  • a Huid-operable piston motor carried by said attachment base and operable to impart an advancing movement to said attachment slide
  • a stop roll rotatably mounted on said attachment base and formed with a plurality of angularly spaced radial bores
  • an actuating pawl coupled to said attachment slide and adapted to impart an incremental angular movement to said ratchet in response to a withdrawing movement of said attachment slide
  • said roll being rotatable by said pawl and ratchet to successive angular positions, in which successive ones of said stop screws are in the path of the advancing attachment slide and limit the advancing movement thereof,
  • a plunger carried by said attachment base and eX- tending movable and relative thereto in said longitudinal direction and arranged normally to move in unison with said attachment base, a rod carried by said bed and extending in said longitudinal direction,
  • means comprising an admission control switch for controlling the admission of fluid to said piston motor
  • admission control switch being arranged to be actuated in response to said movement of said plunger relative to said attachment base
  • a carriage drive control switch which is actuable by said attachment slide and arranged to initiate a forward movement of said carriage in response to an initial advancing movement of said attachment slide and a rearward movement of said carriage in response to an initial withdrawing movement of said attachment slide.
  • said pawl is actuable to impart an incremental angular movement to said ratchet in a iirst sense
  • said roll is formed with a plurality of detent openings spaced by the angle of said incremental movement, and which comprises:
  • a roll return spring connected to said roll and tending to rotate said roll in a second sense, which is opposite to said iirst sense, to an initial angular position
  • a detent element which is engageable with successive ones of said detent openings to lock said roll in respective ones of said angular positions
  • a slider which is movable between predetermined first and second positions and articulated to said actuating pawl, said slider being arranged to be normally in said first position and to provide freedom of movement for said actuating pawl when the slider is in said rst position, and to lock said pawl clear of said ratchet when said slide is in said second position
  • a detent spring arranged to be engaged by said slider and to urge said detent element against said roll when said slider is in said first position, and to be relieved by said slider when the latter is in said second position
  • slider-actuating means for moving said slider from ,said iirst position to said second position in response to a withdrawing movement of said attachment slide from
  • said stop roll is provided with a plurality of angularly spaced pin-mounting means which are associated with respective ones of said radial bores and adapted to hold said trip pinto said roll, and
  • said trip pin is detachably held by one of said pinmounting means.
  • said radial bores are spaced from said ratchet in the axial direction of said roll, said detent openings are arranged on a peripheral circle of said roll between said radial bores and ratchet, and
  • said pin-mounting means consist of additional radial bores arranged on another peripheral circle of said stop roll between said radial bores for said stop screws and said ratchet.
  • a run-up cam arranged to displace said pusher arm in response to a withdrawing movement of said attachment slide
  • said pusher arm being arranged to move said slider from said rst position to said second position under the action of said run-up cam when said lever is fulcrumed on said trip pin
  • stop roll and ratchet are coaxial
  • said radial bores are spaced from said ratchet in the axial direction of said roll, and
  • said detent openings are arranged on a peripheral circle of said roll between said radial bores and ratchet.
  • crank handle is carried by said carriage adjacent to one end of said cross slide and operable to move said cross slide relative to said carriage transversely to said longitudinal direction
  • said attachment base is mounted on said cross slide at the other end thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Transmission Devices (AREA)
US736483A 1967-09-22 1968-06-12 Combination of lathe and thread-cutting attachment Expired - Lifetime US3526161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT862067A AT276900B (de) 1967-09-22 1967-09-22 Für Drehmaschinen bestimmte Zusatzvorrichtung zum automatischen Gewindeschneiden

Publications (1)

Publication Number Publication Date
US3526161A true US3526161A (en) 1970-09-01

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ID=3607096

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Application Number Title Priority Date Filing Date
US736483A Expired - Lifetime US3526161A (en) 1967-09-22 1968-06-12 Combination of lathe and thread-cutting attachment

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US (1) US3526161A (de)
AT (1) AT276900B (de)
CH (1) CH465997A (de)
NO (1) NO127796B (de)
SE (1) SE353251B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744352A (en) * 1971-03-23 1973-07-10 J Scholl Boring and facing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121357A (en) * 1961-03-27 1964-02-18 Dyna Mation Inc Lathe machine
US3363491A (en) * 1964-05-15 1968-01-16 Peter D. George Modular lathes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121357A (en) * 1961-03-27 1964-02-18 Dyna Mation Inc Lathe machine
US3363491A (en) * 1964-05-15 1968-01-16 Peter D. George Modular lathes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744352A (en) * 1971-03-23 1973-07-10 J Scholl Boring and facing apparatus

Also Published As

Publication number Publication date
AT276900B (de) 1969-12-10
NO127796B (de) 1973-08-20
DE1677176A1 (de) 1971-09-30
CH465997A (de) 1968-11-30
SE353251B (de) 1973-01-29
DE1677176B2 (de) 1973-01-18

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