US3864879A - Cam grinding - Google Patents

Cam grinding Download PDF

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Publication number
US3864879A
US3864879A US354745A US35474573A US3864879A US 3864879 A US3864879 A US 3864879A US 354745 A US354745 A US 354745A US 35474573 A US35474573 A US 35474573A US 3864879 A US3864879 A US 3864879A
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United States
Prior art keywords
cam
workpiece
shaft
holding means
headstock
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
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US354745A
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English (en)
Inventor
William Dixon Naismith
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Individual
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Individual
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Publication of US3864879A publication Critical patent/US3864879A/en
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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
    • 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
    • B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
    • B24B17/02—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only
    • B24B17/025—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only for grinding rotating workpieces (three dimensional)
    • B24B17/026—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only for grinding rotating workpieces (three dimensional) for the periphery of plane workpieces, e.g. cams, lenses
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs

Definitions

  • ABSTRACT Cam grinding apparatus comprising a frame adapted to be pivotally mounted between the headstock and tailstock of a grinding machine, workpiece holding means arranged on the frame to carry a cam workpiece to be ground with its axis parallel to but eccentric from the headstock-tailstock axis means to drive the workpiece holding means to rotate a workpiece carried therein, and master cam holding means associated with the workpiece holding means and arranged to carry a master cam in engagement with a guide surface whereby the frame pivots about its mounting to carry the workpiece towards or away from the grinding wheel of the machine in accordance with the master cam on rotation of the cam workpiece.
  • cam grinding apparatus comprising a frame adapted to be pivotally mounted between the headstock and tailstock of a grinding machine, workpiece holding means arranged on the frame to carry a cam workpiece to be ground with its axis parallel to but eccentric from the headstock-tailstock axis, means to drive the workpiece holding mea'ns from the headstock to rotate a workpiece carried therein, and master cam holding means associated with the workpiece holding means and arranged to carry a master cam in engagement with a guide surface whereby the frame pivots about its mounting between the headstock and tailstock towards or away from the guiding wheel of the machine in accordance with the master cam on rotation of the cam workpiece.
  • FIG. 1 shows a schematic side elevation of the embodiment of the invention
  • FIG. 2 shows a part cross-sectional view on the line IIII of FIG. 1, and
  • FIG. 3 shows a part cross-sectional view on the line Ill-III of FIG. 1.
  • FIG. 1 of the drawings there is shown in outline the headstock 5 and tailstock 6 of a conventional crankshaft grinding machine of known type per se in which the grinding wheel is carried on a pivotally mounted arm to achieve grinding wheel feed.
  • An embodiment of the invention is shown mounted between the work centres of the headstock and tailstock and on the bed 7 of that grinding machine.
  • the cam grinding apparatus of this embodiment comprises a frame indicated generally at 10 comprising a headstock end plate 11 and tailstock end plate 12 respectively provided with shafts l3 and l4 by which the frame 10 is pivotally carried between the driven headstock 5 and the running tailstock 6 of the grinding machine.
  • the shaft 13 is rotatably mounted and axially located by means of suitable precision taper roller bearings (not shown) in a support member 17 which is in turn adapted to locate on and be clamped on the bed 7 of thegrinding machine.
  • the end plate 11 is mounted by means of suitable precision taper 'roller bearings (not shown) on the shaft 13, and is connected to the end plate 10 by means of an adjustable length member 19.
  • a three jaw self-centring chuck 20 is carried on a shaft 21 which is mounted .in the end plate 11 by means of suitable precision taper roller bearings (not shown) and rotationally coupled to the shaft 13 by suitable drive means, preferably by a backlash free toothed belt or chain drive arrangement such as that indicated at 15.
  • the end plate 12 is provided with a running centre 22 which is axially aligned with the chuck 20 so that a motor vehicle engine cam shaft such as that indicated at 23 may be carried between them.
  • the cam shaft 23 carried between the chuck and centre will also be rotated. Further, it can be seen that as the frame assembly 10 pivots about the shaft 13 and the tailstock 6, the cam shaft will be carried towards and away from the grinding wheel (indicated in outline at 24) of the machine. In order to maintain engagement between the grinding wheel 24 and one of the cams on the cam shaft 23 the frame 10 is resiliently biassed to rotate about its supports in the appropriate direction by means of a spring device indicated generally at 25 arranged between a roller 16 on the headstock end plate 11 and a suitable portion of the support member 17.
  • the shaft 21 includes an extension behind the chuck 20 which is adapted to receive a master cam group 30 comprising master cams 30a, 30b, 30c, 30d.
  • a second support member 31 is-provided to be carried on the bed 7 of the grinding machine and a guide member 32 is adjustably mounted on that support member 31 in such position that it bears against a chosen one 30a of the master cam group 30.
  • the guide member 32 is adjustabl) mountedon the support 31 in order that it can be correctly aligned with its operative surface in register with the surface of the grinding wheel 24, whereby as the cam shaft 23 is rotated, the support frame 10 and the cam shaft 23 is rocked about the headstocktailstock axis towards and away from the grinding wheel 24 as dictated by the master cam 30a.
  • the master cam group 30 is formed on a stub shaft 35.
  • the stub shaft 35 is formed with a standard morse taper end to fit into a mating taper in the shaft 21 and a suitable angular locating key is provided in the stub shaft to fit into a corresponding slot in the shaft 21.
  • the chuck 20 is provided with suitable adaptors and a locating peg to pick up and locate the end flange or other drive arrangement which is provided on the cam shaft, to drive and angularly locate it in use in an engine.
  • the chuck 20 is angularly adjustable on the shaft 21, a calibrated angular scale and pointer arrangement shown generally at 36 being provided between them.
  • the master cam group 30 of which the cam 30a shown in use may for instance be an exhaust cam profile may be angularly aligned successively with each such exhaust cam on the cam shaft to be ground.
  • the whole assembly is carried axially on the bed 7 of the grinding machine by moving that bed in the conventional manner to bring each cam of the cam shaft to be ground into engagement with the grinding wheel 24.
  • the master cam group 30 comprises a group of master cams corresponding to and angularly related in accordance with the cams of at least two cylinders for a four cylinder engine and three cylinders for a six cylinder engine.
  • a master cam on a stub shaft can be inserted in the shaft 21 for each cam to be ground, the angular relationship of that master cam on its stub shaft being in accordance with the requirements of the cam to be ground.
  • a whole master cam shaft may be provided again eliminating the need for angular adjustment of the chuck 20.
  • a further support for the end of the master cam shaft remote from the shaft 21 is provided in the form of a suitable bracket and bearing.
  • the guide member 32 is pivotally mounted at the end of a slide member 39 which is slidably mounted in the support member 31 for movement in a direction transverse to the axis of the shaft 21.
  • This movement is provided to compensate the wear and re-dressing of the grinding machine, particularly in the case of a grinding machine of the type where the grinding wheel spindle is carried on a pivotally mounted arm to provide grinding feed as in the case of one widely used crankshaft grinding machine.
  • the slide member 39 is adjustable in the support 17 by means of a calibrated collar 43, which is screw threaded onthe slide member and axially trapped in the support 17.
  • the guide member 32 can be caused to pivot about its mounting on the slide member 39 by means of a push rod 44 passing through the slide member and a knurled knob 45 which is screw threaded in the end of the slide member.
  • a scale calibrated in degrees is provided on the slide member so that the angle made between the operative face 46 of the guide member that engages a master cam and the line of contact between the grinding wheel and the cam shaft being ground, may be established. It can be seen that this angle is directly related to the angular relationship of a master cam and the corresponding profile which is reproduced on a cam shaft being ground, and therefore the adjustment of the knob 45 to set a particular angle for the guide member 32 may achieve and advance or retardation of the cam profile ground on a cam shaft at will.
  • a catch mechanism 50 is provided to retain the frame 10 in an inoperative position with the cam shaft workpiece clear of the grinding wheel.
  • the catch mechanism which is showm in the released condition comprises a catch 51 pivotally mounted in the support member 17 and formed with a notch 52 arranged to receive and retain a peg 53 on the frame member 11 to hold it in the inoperative position.
  • the centre of the grinding wheel always lies on a line which usually passes through the axis between the headstock and tailstock.
  • the shaft 13 about which the frame 10 pivots is lowered to bring the axis of the cam work piece into nominal coincidence with the headstock-tailstock axis, with a suitable drive being provided to the lowered shaft 13 from a further shaft arranged to be coupled to the headstock.
  • a suitable arrangement for the lowering of the pivot axis at the tailstock end is also provided. Again if desired in either arrangement a separate drive may be provided on the frame 10 for the work piece holding means independent of the headstock of the grinding machine.
  • the second support member 31 may be positioned on the bed 7 of the grinding machine the other side of the support member 17.
  • the guide surface 32 may be brought to bear on a cam surface on the cam shaft work piece so that that surface may be reproduced elsewhere on the cam shaft. In this way also master cams or cam groups may be ground.
  • a cam grinding attachment comprising a frame having means for pivotal mounting between the headstock and tailstock of the grinding machine, workpiece holding means carried by the frame having means to carry a cam workhaving a guide surface for engagement with a master cam, adjustment means coupled with the guide member whereby the guide member may be pivotally adjusted so that the guide surface registers with the grinding wheel surface in a plane joining the axes of rotation of the grinding wheel and a cam workpiece whereby in use the frame pivots about its mounting means to carry the workpiece towards or away from the grinding wheel in accordance with the master cam on rotation of the cam workpiece.
  • Apparatus as claimed in claim 1 including a second support member for location on the bed of the grinding machine, a first shaft having one end rotatably mounted in the second support and another end having means for rotatable mounting in said headstock of the grinding apparatus, said first shaft being coupled to be driven from the headstock of the grinding machine, wherein said frame is pivotally mounted about said first shaft and said workpiece holding means is coupled to be driven from said first shaft.
  • said frame comprises a headstock end plate pivotally mounted about said first shaft, a tailstock end plate having means for rotatable mounting in the tailstock of the grinding machine, the two end plates being rigidly connected by means of an adjustable length member.
  • said workpiece holding means includes a chuck carried on one end of a second shaft which is rotatably mounted in said headstock end plate.
  • Apparatus as claimed in claim 1 including a plurality of master cams carried by said cam holding means.
  • first support member has mounting means for mounting it on the bed of the grinding machine.
  • Apparatus as claimed in claim 1 including lead screw means coupled with said first support member whereby said first support member may be moved along the bed of the grinding machine relative to said cam holding means to align the guide surface with a chosen one of a group of cams carried in said cam holding means.
  • said workpiece holding means includes calibrated means whereby the angular orientation between a workpiece held therein and said master cam may be adjusted.
  • catch means is provided to retain the frame in an inoperative position with a cam workpiece thereon clear of the grinding wheel of the grinding machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US354745A 1972-04-26 1973-04-26 Cam grinding Expired - Lifetime US3864879A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1936372A GB1361715A (en) 1972-04-26 1972-04-26 Cam grinding

Publications (1)

Publication Number Publication Date
US3864879A true US3864879A (en) 1975-02-11

Family

ID=10128100

Family Applications (1)

Application Number Title Priority Date Filing Date
US354745A Expired - Lifetime US3864879A (en) 1972-04-26 1973-04-26 Cam grinding

Country Status (9)

Country Link
US (1) US3864879A (US07655688-20100202-C00343.png)
AU (1) AU473564B2 (US07655688-20100202-C00343.png)
CA (1) CA985504A (US07655688-20100202-C00343.png)
DE (1) DE2321145C2 (US07655688-20100202-C00343.png)
ES (1) ES414077A1 (US07655688-20100202-C00343.png)
FR (1) FR2182533A5 (US07655688-20100202-C00343.png)
GB (1) GB1361715A (US07655688-20100202-C00343.png)
IT (1) IT1050369B (US07655688-20100202-C00343.png)
SE (1) SE416900B (US07655688-20100202-C00343.png)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005551A (en) * 1975-04-07 1977-02-01 Lines Roy C Cam operated stone grinding device
US4167837A (en) * 1978-02-06 1979-09-18 Cincinnati Milacron-Heald Corp. Method for controlling a grinding wheel-workpiece interface force for a workpiece with diverse grindability characteristics
US4346535A (en) * 1979-07-13 1982-08-31 Toyoda Koki Kabushiki Kaisha Cam grinding machine
US4527356A (en) * 1982-07-23 1985-07-09 Honda Giken Kogyo Kabushiki Kaisha Cam grinding machine
US4627772A (en) * 1984-08-23 1986-12-09 Newmark, Inc. Carving attachment for table saws
CN101659024B (zh) * 2009-07-07 2013-02-27 无锡动力工程股份有限公司 一种用于凸轮轴加工的孔盘式分度装置
US10343251B2 (en) * 2016-03-23 2019-07-09 Jtekt Corporation Cam grinding machine and cam grinding method
CN110695879A (zh) * 2019-10-30 2020-01-17 杭州富阳正成机械设备厂 一种便于五金件加工的工装夹具
CN112207651A (zh) * 2020-09-14 2021-01-12 绍兴兰卡智能科技有限公司 一种机械零件双面加工打磨设备

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1596635A (en) * 1977-07-26 1981-08-26 Newall Eng Cam machining
DE3328367C1 (de) * 1983-08-05 1985-03-07 Schaudt Maschinenbau Gmbh, 7000 Stuttgart Nockenwellenschleifmaschine
DE19813165A1 (de) * 1998-03-25 1999-10-07 Kopp Werkzeugmasch Gmbh Verfahren und Vorrichtung zur spanenden Bearbeitung unrunder Innen- und Außenkonturen
CN108098580A (zh) * 2017-12-20 2018-06-01 昆山万马五金有限公司 一种五金加工抛块用夹具
CN109623500B (zh) * 2019-02-16 2021-04-30 北京工业大学 一种加工复合凸轮的专用机床
CN111251109B (zh) * 2020-02-14 2021-03-12 重庆工业职业技术学院 一种毛刺去除定位装置及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1339746A (en) * 1918-07-15 1920-05-11 Norton Co Cam-grinding apparatus
US2179213A (en) * 1938-09-16 1939-11-07 Norton Co Piston grinding apparatus
US2460744A (en) * 1947-06-06 1949-02-01 Norton Co Camshaft grinding machine
US2733560A (en) * 1956-02-07 strnad

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT97881B (de) * 1923-02-06 1924-09-25 Willibald Gatter Kopiereinrichtung für Werkzeugmaschinen.
US2046261A (en) * 1936-02-06 1936-06-30 Norton Co Grinding apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733560A (en) * 1956-02-07 strnad
US1339746A (en) * 1918-07-15 1920-05-11 Norton Co Cam-grinding apparatus
US2179213A (en) * 1938-09-16 1939-11-07 Norton Co Piston grinding apparatus
US2460744A (en) * 1947-06-06 1949-02-01 Norton Co Camshaft grinding machine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005551A (en) * 1975-04-07 1977-02-01 Lines Roy C Cam operated stone grinding device
US4167837A (en) * 1978-02-06 1979-09-18 Cincinnati Milacron-Heald Corp. Method for controlling a grinding wheel-workpiece interface force for a workpiece with diverse grindability characteristics
US4346535A (en) * 1979-07-13 1982-08-31 Toyoda Koki Kabushiki Kaisha Cam grinding machine
US4527356A (en) * 1982-07-23 1985-07-09 Honda Giken Kogyo Kabushiki Kaisha Cam grinding machine
US4627772A (en) * 1984-08-23 1986-12-09 Newmark, Inc. Carving attachment for table saws
CN101659024B (zh) * 2009-07-07 2013-02-27 无锡动力工程股份有限公司 一种用于凸轮轴加工的孔盘式分度装置
US10343251B2 (en) * 2016-03-23 2019-07-09 Jtekt Corporation Cam grinding machine and cam grinding method
CN110695879A (zh) * 2019-10-30 2020-01-17 杭州富阳正成机械设备厂 一种便于五金件加工的工装夹具
CN110695879B (zh) * 2019-10-30 2023-11-10 苏可森(天门)模塑科技有限公司 一种便于五金件加工的工装夹具
CN112207651A (zh) * 2020-09-14 2021-01-12 绍兴兰卡智能科技有限公司 一种机械零件双面加工打磨设备

Also Published As

Publication number Publication date
DE2321145A1 (de) 1973-10-31
IT1050369B (it) 1981-03-10
ES414077A1 (es) 1976-02-01
AU5487973A (en) 1974-10-31
DE2321145C2 (de) 1982-12-30
SE416900B (sv) 1981-02-16
GB1361715A (en) 1974-07-30
FR2182533A5 (US07655688-20100202-C00343.png) 1973-12-07
CA985504A (en) 1976-03-16
AU473564B2 (en) 1976-06-24

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