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US2017927A - Cam grinding machine - Google Patents

Cam grinding machine Download PDF

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Publication number
US2017927A
US2017927A US384068A US38406829A US2017927A US 2017927 A US2017927 A US 2017927A US 384068 A US384068 A US 384068A US 38406829 A US38406829 A US 38406829A US 2017927 A US2017927 A US 2017927A
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US
United States
Prior art keywords
cam
work
carriage
grinding
wheel
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US384068A
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English (en)
Inventor
Amos P Steiner
Edgar P Wine
Conrad L Ott
Harold E Balsiger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Landis Tool Co
Original Assignee
Landis Tool Co
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 Landis Tool Co filed Critical Landis Tool Co
Priority to US384068A priority Critical patent/US2017927A/en
Priority to GB22935/30A priority patent/GB355475A/en
Priority to DE1930613824D priority patent/DE613824C/de
Application granted granted Critical
Publication of US2017927A publication Critical patent/US2017927A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts

Definitions

  • GAM GRINDING MACHINE Filed Aug. 7, 1929 e sheets-sheet 1 Hnos P. srs-vsn EDGHR P. wir/l:y BY CoA/ann L. o'r-r Hav/101m s. Bumsen Oct. 22, 1935.
  • Our invention relates to machines for grinding cam shafts and the prime object of the invention is to provide a machine which will operate automatically to completely grind the cam shaft.
  • Figure 1 is a front elevation of the machine
  • Figure 2 is an end elevation looking from the left of Figure l
  • Figure 3 is a plan view of the head stock with parts shown in section
  • Figure 4 is an end elevation of the driving mechanism for shifting the master cam roller
  • Figure 5 is a front elevation of the parts shown in Figure 4,
  • FIG. 6 is a' front elevation of the timing cam and the control valve with the latter shown in section
  • Figure 7 is a plan view of the timing cam and the control lever
  • FIG 8 is a somewhat diagrammatic view of the wiring circuits and fluid conduits by means of which the various mechanisms are hydraulically driven.
  • reference character I0 indicates the bed of the grinding machine having a work carriage'll, a wheel base I2 in which is mounted a grinding wheel I3.
  • a wheel I4 provides means for manually moving the grinding Wheel toward and from the Work.
  • 'I'he Work carriage Il is provided with a head stock I5.
  • the head stock is driven by a motor I6 through a reduction unit I'I.
  • the head stock and tail stock are mounted upon a swinging cradle or rock bar I8 which is suitably'pivoted upon the work carkmeans o'f a sprocket chain 38.
  • the cradle I8 is pivoted at the right hand end thereof as viewed in Fig. 1 and in Fig. 2, the cradle is shown in 5 end view.
  • Mounted in the head stock I5 is a master cam I9 which is axially aligned with the work, not shown, which work is carried between the head and tail stocks in the usual way. 'Ihe necessary swinging motion of the work carrying 10 cradle or rock bar is provided by the master cam which is resiliently held against a follower roll 20.
  • the roll 20 is mounted so as to move axially along a shaft 2l, its movement being produced by y means of a screw 22 and a bifurcated member 23 l5 which engages the sides of the cam roller 20 so that rotation of the screw 22 will move the cam follower roll 20 to position it opposite the desired cam cn the master cam shaft.
  • This mechanism consists of a rack 24 slidably mounted in the bed of the machine and attached to a piston rod 25 by means of a bracket 26.
  • 'Ihe piston rod 25 is connected to a piston 2-'I in a cylinder 28 25 which piston and-cylinder form the motor for reciprocating the work carriage.
  • 'Ihe rack 24 engages a pinion 29 on a shaft 30 which is mounted in the bed of the machine.
  • 'I'he inner end of the shaft 30 carries a bevel gear 3I which 30 meshes with a corresponding bevel gear 32 on a shaft 33.
  • the bevel gear 32 is slidably mounted on the shaft 33 so that the rack 24 and shaft 33 may move with the work carriage I I.
  • the shaft 33 also carries a sprocket which drives alchain 35 .34- which forms the driving connection with a sprocket 35.
  • Another sprocket 36 mounted to. rotate with sprocket 35 drives a sprocket 31 by Sprocket 31 is means of which the cam follower roll 20 is moved along the shaft 2
  • a spring 38 is mounted in a projection i 39 of the head stock cover. 'I'his spring is held between two caps 40 and 4I on a pin 42 which is connected to a lug 43 on the swinging cradle I8. 'I'he purpose of the spring 38 is to hold the cam shaft
  • a cylinder 44 is also secured to the cover 45 of the head stock.
  • the cylinder 44 carries a piston bolt 50 passes is slotted to provide a little lost 10 motion lbetween the link 49 and piston rod l48.
  • the purpose of the slot is to provide lost motion to allow free oscillation of the cradle duri-ng grinding operations.
  • the inner end of the link 49 is secured to a lug 5
  • the chambers on the opposite sides of the piston 41 are connected by pressure uid lines 52 and 53. When pressure fluid is introduced into the cylinder 44 through line 52 the cradle will be withdrawn to separate the master cam from the cam follower roll and also separate the work from the grinding wheel so as to allow the work to be traversed past the grinding wheel. ,The4
  • pipe 52 is provided with a ball check valve 52 around which there is a by-pass passage 58 so that the fluid may freely flow into the cylinder 44 but will have its return ow checked so as to prevent too sudden a return of the master cam shaft against the cam follower roll. Thisprevents injury to the master cams and to the cam follower roller.
  • a limit switch 56 which switch is in circuit with the work driving motor.
  • the cam 54 is secured to cam 55 by screws 9 positioned through arcuate slots 8. These slots permit ad- 40 justment of cam 54 relative to cam 55 to change the time at which the work drive motor is slowed I down.
  • the operation of the limit switch is as follows: The switch 56 controlled by the cam 55 is normally closed. This closes a circuit through -lines 51, 58,' 59 and coil 69 to energize this coil and close switch at 6
  • cam 54 on a shaft 1
  • is driven by a motor 12 through reduction gearing 13.
  • the cam 54 operates a lever 14 on which lever is a cam follower 15 which is aml -engaged by a projection 16on cam 54.
  • the lever 14 is pivoted at 11 on the bed of the machine.
  • On the end of the lever opposite the cam is an index finger 18 which engages in notches in a spacing bar 19 secured to the work carriage of "gfthe machine. The notches 88 in the spacing bar during grinding operations.
  • is secured to the front of the base of the machine. This valve casing is bored to receive valves 82 and 83.
  • the valve 82 is a reversing 5 valve which distributes the pressure uid to the cradle retracting cylinder 44 and also to the wheel base cylinder 8,4.'
  • the valve consists of spaced disks which control valve ports 52 and 53, 81, 88, 89 and 98.
  • extends 10 up through the valve casing and is engaged by the'end of the lever 14 by which the valve is operated.
  • a spring 92 is positioned beneath the lower disk on the valve and rests at the lower end of the bore which forms the valve body.
  • This 15 spring tending normally to hold the valve disks in elevated position, as shown in Figs. 6 and 8.
  • Pressure fluid is supplied to the valves by means of a pump 93 delivering fluid through a line 90.
  • a pump 93 delivering fluid through a line 90.
  • pressure fluid is delivered through the line 98, line 88 to the cylinder 84 to move the wheel base to its forward or grinding position and hold it there.
  • valve 83 This 55' would occur but for the fact that the control valve 83 is opened sufficiently just before contact 15 reaches the top of cam 16 to allow the carriage to begin its traverse and so when the cam releases the lever the carriage has moved 60 far enough for the spacing bar 19 to hold the lever 14 down until a new notch comes into position above the nger 18.
  • will force-the finger 18 into a notch as soon as the work carriage has moved the correct distance to bring a cam opposite the grinding wheel.
  • 'I'he work indexing motor is controlled by means of the valve 83.
  • This valve consists of a bore in which a pair of spaced valve disks operate, the disks being connected to a stemv 95 which projects out of the casing and is pivotally connected at 96 to a.
  • lever 91 The lever 91 is pivoted at 98 to the base of the machine and has one end pivoted to the lower end of the valve stem 9
  • a clutch throw-out mechanism consisting of a bent lever
  • the opposite end of the lever acts through a pair of links
  • 5 has a bifurcation to engage a spool
  • 8 acts normally to hold the lever to keep the two parts of the clutch engaged.
  • the operation of the machine is as follows: Assuming that all parts ofthe machine are in a, position to start grinding, i. e.,the master cam
  • a machine for grinding cam shafts compris- 50 ing a base, a work carriage, a grinding wheel, a. cradle swingably mounted on the Work carriage, a master cam mounted on said cradle, a cam follower roll adapted to engage the master cam to swing the cradle, a motor for indexing the work 55 carriage past the grinding wheel, and means operated by said motor for shiftingthe camfollower shoe to position it adjacent a caml on the master cam shaft corresponding to cams on a work piece which is being operated on by the 60 grinding wheel and a motor operable independently of any moving parts on the machine for timing indexing of the work carriage, substantially as set forth.
  • an automatic cam grinding machine having a work carriage, a wheel support and a work cradle, a fluid motor for operating said work carriage and said wheel support, a timing and indexing mechanism comprising a timing cam, a motor operable independently of other mechanism on the machine for driving said cam, a lever operated by said cam, valves operable by said lever to operate the work carriage, Work cradle and wheel support, a notched spacing bar on the work carriage, a finger-on said lever adapted-to enter said notches, and means whereby said iinger may enter said notches without interference to stop the work carriage in grinding position, substantially as set forth.
  • an automatic cam grinding machine having a grinding wheel support and a grinding wheel mounted thereon, a work cradle and a work carriage, pressure iiuid means for operating the work'carriage, wheel support and the work 105 cradle, a valve in control of said pressure uid means, a timing cam for controlling the operation of said valve, means operable independently of other mechanism on the machine for driving said cam and automatic means to disconnect said cam and said driving means at a predetermined point in the operation of the machine, substantially as set forth.
  • a cam grinding machine a work carriage, a grinding wheel, a work cradle pivoted on said 29.@ carriage, a motor driven timing cam, a motor driven independently of other mechanism on the machine for operating said cam and ⁇ means operated by said timing cam to cause withdrawal of the wheel base and work cradle to inoperative po- 25., sition, substantially as set forth.
  • a cam grinding machine having a base, a work carriage, a grinding wheel, a work cradle pivoted on said carriage, a timing cam, a motor drivenindependently of the mechanism on the gggmachine for operating said cam, means operated by said timing cam to cause withdrawal of the wheel and work cradle to inoperative position the same means acting to cause a return of said wheel and said cradle to operative position, substantially las set forth.
  • An automatic cam grinding machine comprising a wheel base, a grinding wheel mounted thereon, a work carriage, a cradle pivotally mounted on said carriage, power means to operate v #said wheel base, carriage and cradle and a. timing and indexing mechanism for controlling the operation of said power means, carriage and cradle, and a motor operable independently of other mechanism on the machine for operating said -i-timing mechanism, substantially as set forth.
  • a bed a wheel base, a work carriage, a fluid motor for moving said work carriage transversely of said wheel base,
  • a work supporting cradle pivotally mounted on said carriage, a spacing bar mounted on said carriage, a rotatable timing cam, means for locking the spacing bar in one of several predetermined positions, a valve in control of the carriage traverse motor and a lever actuated by the said -cam for releasing the locking means and for operating the said valve tocontrol movement of the wheel base and the work carriage, a motor operable independently of other mechanism on the machine for operating said cam, said spacing bar operating to hold said lever in depressed position until said carriage has moved the work to another grinding position.
  • An automatic cam grinding machine comprising a traversable work carriage, an oscillating work cradle on said carriage, a grinding wheel, a wheel support, means to provide relative traverse and longitudinal movement between said carriage 10.; and said support, a spacing bar on said carriage having portions corresponding to several parts of a work piece, means engaging said spacing bar and adapted to cooperate with said portions, and means actuated on withdrawal of said engaging 15' means to actua-te said carriage and to withdraw said wheel support and rock said work cradle to inoperative position, substantially as set forth.
  • An automatic cam grinding machine having a work support, index mechanism for said sup- 29; port, a grinding wheel, a support for said wheel, mechanism to move one of said supports transversely of the other," mechanism to move the other support longitudinally of the first-named supportI and means whereby the movements of said sup- 25.'- ports are controlled by said indexing mechanism.
  • An automatic cam grinding machine having a Work support, a wheel support, power means to move said supports relative' to each other transversely, and power means to move said supports 30 relative to each other longitudinally, and means to effect said movements at predetermined intervals including a spacing bar mounted one one of said supports, and control mechanism cooperating with said spacing bar and controlling the 35 power means imparting longitudinal movement to said supports to stop said longitudinal movement, said control mechanism operating at the sametime to cause said transverse movement to bring the wheel and work into grinding contact.
  • An automatic cam grinding machine having a work carriage index and control mechanism comprising a spacing bar on said carriage, means engaging said spacing bar and adapted to locate ⁇ said carriage accurately in several grinding posi- 45 tions, means to withdraw said locating means from said bar at predetermined intervals, and means actuated on withdrawal of said locating means to actuate said carriage and means actuted on withdrawal of said locating, means to move 50 said wheel support to inoperative position, substantially as set forth.
  • An automatic cam grinding machine having a work support, a wheel support, power means to move said supports. means to provide relative transverse and longitudinal movement of said supports at predetermined intervals comprising a spacing' bar mounted on one of said supports, an element in control of said power means adapted to cooperate with said spacing bar to stop said 00"- longitudinal movement, said element acting also to permit movement of the said wheel support into grinding position, and means actuated on withdrawal of said element to move said wheel support to inoperative position, substantially as set forth.
  • An automatic grinding machine having a work support and a wheel support, power means to provide relativev tranverse and longitudinal",- movement between said supports, a spacing bar on one of said supports, notches on said spacing bar, a nger ladapted to engage said notches to locate .various portions of a work piece in grinding position, means operating with said nger to actuate said power means, and a timing mechanism to actuate said linger, substantially as set forth.
  • An automatic grinding machine having a work support and a wheel support, power means to provide relative transverse and longitudinal movement of said supports, a spacing bar on one of said supports, a finger adapted to engage said spacing bar, control means for said power means adapted to be actuated synchronously with said flnger, means to actuate said finger at predetermined intervals to permit movement of said work support, said means acting also to cause moment of said support, substantially as set for 17.
  • An automatic grinding machine having a power driven work support and wheel support, control mechanism for said supports comprising a spacing bar on one of said supports, means adapted to cooperate with said spacing bar to locate the support accurately in successive grinding positions, means to withdraw said locating means from said bar at predetermined intervals, means actuated on withdrawal of said locating means to actuate said support, and means to hold said locating means in withdrawn position until said support has moved to the next grinding position, substantially as set forth.
  • An automatic grinding machine having power driven work support and wheel support, indexing and control mechanism for said supports comprising a spacing bar on one of said supports, means adapted to cooperate with said spacing bar to locate the support accurately in successive grinding positions and to cause said other support to move toward and away from said rst support, means to withdraw said locating means from said bar at predetermined intervals, means actuated on withdrawal of said locating means to move one of said supports to inoperative position and the other to the next grinding position, means whereby said locating means may return to normal position relative to said spacing bar, and means actuated by said locating means in normal position to stop said part in grinding position and to return said other part to operative position, substantially as set forth.
  • a machine for grinding cam shafts comprising a bed, a work carriage and a wheel base mounted thereon, a grinding wheel rotatably mounted on the wheel base, a work support movably mounted upon the work carriage, a master cam mounted on said work support, a cam follower roll engageable by the master cam, a motor for moving the work carriage relative to the grinding wheel, means for indexing the work carriage to lock it in predetermined positions with respect to the grinding Wheel, means operated by movement of the said work carriage for shifting the cam follower roll axially of the master cam and a motor operated independently of the carriage drive motor for timing indexing of the said carriage, substantially as set forth.
  • a work carriage power means for driving said carriage, means automatically operable to start and stop said power means at intervals comprising means to time the movement of the carriage, means to positively lock the carriage in grinding position, and means actuated by said timing means to unlock said carriage and cause said power means to move'it to the next position, substantially as set forth.
  • a work carriage a wheel carriage, power means to drive said work carriage, means automatically operable to start and stop said power means at intervals comprising means to time the movement of the work carriage, means for locking the carriage in grinding position, means actuated by said timing 5 means for unlocking said carriage and permit it to be moved by said power means to the next position, and means controlled by movement of the work carriage for stopping said timing means, substantially as set forth.
  • a wheel base, work carriage and work cradle means to provide intermittent relative longitudinal and transverse movements of said parts, comprising a spacing bar, mechanism adapted to cooperate with said spacing bar to control the movement of the work carriage, wheel base and work cradle, means actuated by said mechanism in normal position to prevent movement of the work carriage, and to cause said wheel base and work cradle to move to operative position, and means on said spacing bar to hold said mechanism out of normal position after the last portion of the work piece has been ground, substantially as set forth.
  • avalve in control of said motor means for locking the work carriage in any one of several predetermined positions, a timing cam for releasing said locking means, a work drive motor, means for slowing down said work drive motor at a predetermined time, operative connection between said timing cam .and said speed change mechanism, and means for varying the point at which the change in speed of the work rotating motor occurs, substantially as set forth.
  • a work drive motor for timing the indexing of a work carriage, means operably connected to said timing means for changing from high speed to low speed work drive, and means for changing the relative duration of fast and slow speed operation of the work drive motor, substantially as set forth.
  • a hydraulically operated cam grinding machine comprising a rotatable grinding wheel
  • a traversable table a rock bar thereon rotatably supporting a camshaft in operative relation to the wheel, means including a set of master cams and a follower to rock the bar and determine the cam contour during the grinding operation, a fluid pressure operated mechansm t( traverse the table in either direction, a uid pressure operated mechanism to rock said bar and move the camshaft to an inoperative position, means including a iiuid pressure operated mechanism to move the wheel towards and from the work to grind the cams thereon, a uid pressure system including a valve mechanism connected 30 to each of said iiuid pressure operated mechanisms and operating to admit fluid successively thereto whereby to traverse the table and position the cam opposite the wheel, then to move the wheel and grind the cam, and thereafter g5 to lock the bar and move the cam away from the wheel, and a main control cam for actuating said valve mechanism to control the cycle of operations.
  • a hydraulically driven automatic cam grinding machine of the type covered by claim 25 comprising a drive shaft to rotate the main control cam and a clutch arranged to connect said cam with the drive shaft at the start of the grinding cycle and to disconnect it therefrom at the end of the cycle after the camshaft has been ground.
  • a hydraulically driven automatic camshaft grinding machine of the type covered by claim 25 comprising a clutch to rotate the main control cam, and means actuated by the traversing movement of the table to connect said clutch at the start of the cycle and to disconnect it at the end of the cycle of operation,
  • a hydraulically driven cam grinding machine comprising a rotatable grinding wheel, a traversely movable slide therefor, fluid pressure means to move said slide, a longitudinally movable Work supporting table, fluid pressure means to traverse said table, a rock bar pivotally mounted on said table and arranged to support a camshaft for movement toward and from the grinding wheel, fluid pressure mechanism tov rock said bar to an inoperative position so as to separate the grinding wheel and the camshaft during the traversing movement, a main control valve mechanism arranged to admit fluid successively to said fluid pressure mechanisms, a rotatable control carnwhich is arranged to actuate said valve mechanism to control the cycle of operation, and a clutchl arranged to automatically connect said cam with the drive shaft at the start of the grinding cycle and to disconnect it therefrom at the end of thc cycle after the camshaft has been ground.
  • a hydraulically driven z utomatic camshaft grinding machine of the type :overed by claim 25 comprising a clutch to rotat, the main control cam, and means including a iog mechanism on the table arranged to connect said clutch at the start of the cycle, to disconnect the clutch during the truing operation and at the end of the grinding cycle.
  • locking means engageable with said seats for stoping the table and holding it in fixed position, means controlled by the machine for releasing said locking means, a iiuid motor for operating said table, and means operable upon a release of said locking means for controlling pressure uid to said motor.
  • a. work support means to mount a work piece rotatably 10 thereon, a wheel support, mechanism to effect relative transverse movement of saidsupports, mechanism to effect relative longitudinal movement of said supports intermittently to bring the grinding wheel into grinding relation with different portions of the work piece, means for rotating said Work, and a control means therefor for rotating the work at a roughening speed and automatically changing the speed of rotation to a finishing speed during the grinding of each portion.
  • a work support means to mount a Work piece rotatably thereon, a wheel support, mechanism to effect relative transverse movement of said supports, mechanism to effect relative longitudinal movement of said supports, a timing mechanism for intermittently effecting longitudinal movement of said supports to bring said Wheel and a series of portions of the work piece into operative 3o grinding relation, means for rotating said work, and a control means operated by said timing mechanism for rotating the work at a roughening, speed and automatically changing the speed of rotation to a finishing speed during the grinding CONRAD L. OTI.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US384068A 1929-08-07 1929-08-07 Cam grinding machine Expired - Lifetime US2017927A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US384068A US2017927A (en) 1929-08-07 1929-08-07 Cam grinding machine
GB22935/30A GB355475A (en) 1929-08-07 1930-07-30 Improvements in or relating to cam grinding machines
DE1930613824D DE613824C (de) 1929-08-07 1930-08-07 Maschine zum Schleifen von Nockenwellen u. dgl. im Kopierverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US384068A US2017927A (en) 1929-08-07 1929-08-07 Cam grinding machine

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US2017927A true US2017927A (en) 1935-10-22

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US384068A Expired - Lifetime US2017927A (en) 1929-08-07 1929-08-07 Cam grinding machine

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US (1) US2017927A (de)
DE (1) DE613824C (de)
GB (1) GB355475A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473741A (en) * 1943-11-06 1949-06-21 Cincinnati Milling Machine Co Pattern controlled milling machine
US2786311A (en) * 1955-05-09 1957-03-26 Norton Co Cam grinding machine
US3247620A (en) * 1963-11-15 1966-04-26 Landis Tool Co Multiple position feed mechanism
US4215962A (en) * 1979-05-09 1980-08-05 The Wickes Corporation Internal milling machine for milling crank pins

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473741A (en) * 1943-11-06 1949-06-21 Cincinnati Milling Machine Co Pattern controlled milling machine
US2786311A (en) * 1955-05-09 1957-03-26 Norton Co Cam grinding machine
US3247620A (en) * 1963-11-15 1966-04-26 Landis Tool Co Multiple position feed mechanism
US4215962A (en) * 1979-05-09 1980-08-05 The Wickes Corporation Internal milling machine for milling crank pins

Also Published As

Publication number Publication date
GB355475A (en) 1931-08-27
DE613824C (de) 1935-05-31

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