US3857204A - Centerless grinding apparatus - Google Patents

Centerless grinding apparatus Download PDF

Info

Publication number
US3857204A
US3857204A US00309706A US30970672A US3857204A US 3857204 A US3857204 A US 3857204A US 00309706 A US00309706 A US 00309706A US 30970672 A US30970672 A US 30970672A US 3857204 A US3857204 A US 3857204A
Authority
US
United States
Prior art keywords
work piece
driving wheel
arm
work
centerless grinding
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
US00309706A
Other languages
English (en)
Inventor
A Richard
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.)
RICHARDS MICRO TOOL CO
RICHARDS MICRO TOOL CO INC US
Original Assignee
RICHARDS MICRO 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 RICHARDS MICRO TOOL CO filed Critical RICHARDS MICRO TOOL CO
Priority to US00309706A priority Critical patent/US3857204A/en
Priority to IL43101A priority patent/IL43101A/en
Priority to AU60089/73A priority patent/AU475946B2/en
Priority to CS6370A priority patent/CS175462B2/cs
Priority to FR7334186A priority patent/FR2208322A5/fr
Priority to CA183,948A priority patent/CA988720A/en
Priority to SE7314311A priority patent/SE404665B/xx
Priority to GB4938973A priority patent/GB1423882A/en
Priority to CH1492973A priority patent/CH555726A/de
Priority to IT30414/73A priority patent/IT998844B/it
Priority to JP48119792A priority patent/JPS4983092A/ja
Priority to DD174296A priority patent/DD109821A5/xx
Priority to SU1966002A priority patent/SU550964A3/ru
Priority to ES420155A priority patent/ES420155A1/es
Priority to BE137905A priority patent/BE807499A/xx
Priority to BR9152/73A priority patent/BR7309152D0/pt
Priority to NL7315977A priority patent/NL7315977A/xx
Priority to DE2359024A priority patent/DE2359024C3/de
Priority to AR251198A priority patent/AR196813A1/es
Application granted granted Critical
Publication of US3857204A publication Critical patent/US3857204A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/35—Accessories

Definitions

  • ABSTRACT A center less grinding machine of the type in which a work piece rests in a pair of yokes and is rotated by a 52 US. Cl. 51/103 wn, 51/236 driving wheel, in hi the driving wheel is mounted [51] Int.
  • the driving wheel is mounted on the forward end of a support arm which is pivoted at a rear portion so that the driving wheel can be moved into and out of engagement with the work piece.
  • the force urging the driving wheel into engagement with the work piece is the weight of the support arm, the driving wheel, and the driving motor, which is mounted on the support arm.
  • the arm is lifted out of engagement with the workpiece by a hydraulic cylinder connected between the arm and the base of the machine.
  • an adjustable stop is provided, so that the position of the wheel in relation to the resilient surface of the driving wheel may be controlled.
  • stop means must be re-adjusted for each new diameter of work piece placed in the machine, which further reduces the production rate.
  • the centerless grinding machine disclosed herein utilizes a novel form of work driving mechanism, in which a support arm which is freely pivoted at a medial portion is provided with a driving wheel and motor at one end and means for adjusting the force with which the driving wheel presses against the work piece.
  • said means comprises a counterweight slidably mounted on the arm on the side of the pivot opposite to the side on which the driving wheel is mounted. The counter-weight may be moved toward and away from the pivot to decrease and increase, respectively, the pressure of the driving wheel against the work piece.
  • a stop is provided to limit the movement of the driving wheel in the direction of the arm, said stop is not normally utilized during a grinding operation, but instead, the driving wheel and support arm is supported only by the work-piece.
  • the driving force therefore does not vary during the rotation of the driving wheel, and any lack of concentricity of the driving wheel does not affect either the driving force or the pressure of the wheel against the work piece, since the arm can move freely up and down during rotation of the driving wheel.
  • FIG. 1 is a view in front elevation of a centerless grinding machine embodying the features of the invention, with the driving wheel in the operating position against the work piece.
  • FIG. 2 is a view of a portion of the machine of FIG. 1, with the drivingwheel in the non-operating position.
  • FIG. 3 is a top plan view of the machine as illustrated in FIG. 1.
  • FIG. 4 is an enlarged view in side elevation of the work-holding portion and work stop adjusting means.
  • FIG. 5 is a top plan view of the machine shown in FIG. 4.
  • FIG. 6 is a view of the portion of the machine shown in FIG. 4 as seen from the left end of FIG. 4.
  • FIG. 7 is a view of the portion of the machine shown in FIG. 4 as seen from the right end.
  • the illustrated embodiment of the machine utilizes certain basic components which are common to centerless grinders now in commercial use.
  • the machine comprises a base 10 having a bed 12 on the upper surface and carrying a mount 14 for a grinding wheel 16 and a grinding wheel motor 18.
  • the bed is longitudinally and transversely adjustable relative to the grinding wheel by conventional mechanisms operated by hand wheels 20 and 22.
  • a support 24 for the work supporting and rotating mechanism is disposed on the bed and is so mounted thereon as to enable the mechanism to be moved longitudinally on the bed and rotated thereon in relation to the horizontal axis thereof.
  • the top of the support 24 has a horizontal way 26 onto which is slidably mounted a block 28 carrying a vertically extending work holder 30 having a V- shaped recess 32 for receiving a work piece, and the end of the support 24 is provided with a vertical way 34 onto which is slidably mounted a block 36 carrying a second vertically extending work holder 38 having a V-shaped recess 40 for receiving the work piece.
  • the block 28 is slidable horizontally to accomodate which comprises a stop bar 42 clamped in a holder 44 mounted on a longitudinally adjustable block 46.
  • the holder 44 is secured to the block 46 by a bolt 48 extending through an arcuate slot 50 in the holder 44.
  • the holder is therefore adjustable by being rotatable about the bolt 48 as a center and rotatable about the center of the arc of the arcuate slot, to enable the stop bar 42 to be positioned on the centerline of work pieces of various sizes.
  • the workpiece rests in the V- shaped recesses 32 and 40 with an end or other portion thereof to be ground in contact with the rotating grinding wheel 16.
  • the work piece W is rotated in said recesses in the same direction as the grinding wheel so that the'contacting surfaces thereof are moving in opposite directions.
  • a fixed support arm 52 is mounted on the support 24 and is inclined upwardly therefrom in a direction away from the grinding wheel.
  • a movable arm 54 is mounted at its media] portion to the end of the fixed arm 52 at pivot 56.
  • the movable arm 54 carries at one end a driving wheel 58 and driving motor 60, and
  • a weight adjusting block 62 carries on its upper surface a weight adjusting block 62, slidably mounted in a longitudinal slot 64.
  • the arm 54 is movable about the pivot between an upper or non-operating position as shown in FIG. 2 and a lower or operating position as shown in FIG. 1, and is so positioned that when the arm is in the operating position, the driving wheel contacts the work piece between the work holders 30 and 38.
  • the axis of the driving wheel is inclined in relation to the axis of the work piece in the usual manner so that the rotation of the driving wheel not only rotates the work piece, but also imparts an end thrust thereto so that the work piece is held firmly against the end of the stop bar 42 during the grinding operation. 7
  • the pressure with which the driving wheel bears against the work piece may be readily adjusted by moving the block 62 along the arm 54. On work pieces of small diameter the block may be a considerable distance to the left (as seen in FIG. 1) of the pivot 56 so that an appreciable portion of the weight of the motor 60 and driving wheel 58 is counterbalanced by the weight, and the wheel 58 bears against the work piece with only a slight pressure.
  • the weight 46 When larger work pieces are being ground, the weight 46 will be nearer the pivot, so that less of the weight of the motor and driving wheel is counterbalanced, and the driving wheel bears against the work piece with greater pressure.
  • the block 62 In the case of extremely large work pieces, it may be desired to move the block 62 to the right of the pivot so that a portion of the weight of the block is added to the weight of the motor and driving wheel, to increase the pressure against the work piece.
  • the position of the block 62 for any particular desired pressure of the driving wheel against the work piece will, of course, depend on the relative weights of the components.
  • the pressure of the driving wheel against the work piece remains constant throughout the revolution of the driving wheel, even though the wheel may not be perfectly circular, since the arm 54 is supported only by the work piece and is free to move up and down during the rotation of the driving wheel as necessary to accomodate any lack of concentricity of the wheel periphery.
  • the balance of the arm 54 also makes it easy for the machine operator to lift the arm to replace the work piece, without any power assistance being necessary.
  • the arm 54 When it is desired to temporarily stop the operation of the machine the arm 54 may be lifted and retained in the upper position by placing a stop pin 66 in an aperture inthe support arm.
  • work holders are spaced elements with V-shaped recesses, it will be understood that other forms of work holders may be used.
  • a centerless grinding apparatus especially adapted for a thin, flexible work piece comprising a base, a pair of spaced-apart work supports on the base for receiving a cylindrical portion of the work piece, a grinding wheel adapted to operate upon a portion of the work piece extending beyond the work supports, a balanced arm medially pivoted on the base, a driven driving wheel rotatably supported on one end of the arm and adapted drivingly to engage the portion of the work piece between the supports, means on the other end of the arm for counterbalancing the arm and means for adjusting the position of the counterbalancing means to vary the force with which the driving wheel engages the work piece in full floating engagement, whereby the bearing force of the driving wheel is sufficient to drive without distorting the work piece.
  • a centerless grinding apparatus according to claim 1 further characterized in that the counterbalancing means includes a counter weight on the arm movable to adjust its spacing from the pivot.
  • a centerless grinding apparatus according to claim 1 further characterized in that the pivoted arm is movable to withdraw the driving wheel into widely separated relationship with the work piece.
  • a centerless grinding apparatus according to claim 1 further comprising driving means on the arm connected to the driving wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US00309706A 1972-11-27 1972-11-27 Centerless grinding apparatus Expired - Lifetime US3857204A (en)

Priority Applications (19)

Application Number Priority Date Filing Date Title
US00309706A US3857204A (en) 1972-11-27 1972-11-27 Centerless grinding apparatus
IL43101A IL43101A (en) 1972-11-27 1973-08-29 A work supporting and rotating device
AU60089/73A AU475946B2 (en) 1972-11-27 1973-09-06 Centerless grinding apparatus
CS6370A CS175462B2 (de) 1972-11-27 1973-09-14
FR7334186A FR2208322A5 (de) 1972-11-27 1973-09-24
CA183,948A CA988720A (en) 1972-11-27 1973-10-22 Centerless grinding apparatus
SE7314311A SE404665B (sv) 1972-11-27 1973-10-22 Anordning for att vid en slipmaskin for centerlesslipning uppbera och rotera ett arbetsstycke
CH1492973A CH555726A (de) 1972-11-27 1973-10-23 Werkstueck-abstuetzungs- und -drehmechanismus in einer spitzenlosen schleifmaschine.
IT30414/73A IT998844B (it) 1972-11-27 1973-10-23 Macchina rettificatrice senza centri
GB4938973A GB1423882A (en) 1972-11-27 1973-10-23 Centreless grinding machines
JP48119792A JPS4983092A (de) 1972-11-27 1973-10-24
DD174296A DD109821A5 (de) 1972-11-27 1973-10-25
SU1966002A SU550964A3 (ru) 1972-11-27 1973-10-30 Устройство дл бесцентрового шлифовани
ES420155A ES420155A1 (es) 1972-11-27 1973-10-31 Maquina rectificadora sin centro con la rueda motriz inde- pendiente de la pieza de trabajo.
BE137905A BE807499A (fr) 1972-11-27 1973-11-19 Appareil a rectifier centerless
BR9152/73A BR7309152D0 (pt) 1972-11-27 1973-11-22 Mecanismo de rotacao e fixacao e maquina abrasiva
NL7315977A NL7315977A (de) 1972-11-27 1973-11-22
DE2359024A DE2359024C3 (de) 1972-11-27 1973-11-27 Werkstücksupport einer Maschine zum spitzenlosen Rundschleifen
AR251198A AR196813A1 (es) 1972-11-27 1973-11-27 Maquina esmeriladora sin centro

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00309706A US3857204A (en) 1972-11-27 1972-11-27 Centerless grinding apparatus

Publications (1)

Publication Number Publication Date
US3857204A true US3857204A (en) 1974-12-31

Family

ID=23199325

Family Applications (1)

Application Number Title Priority Date Filing Date
US00309706A Expired - Lifetime US3857204A (en) 1972-11-27 1972-11-27 Centerless grinding apparatus

Country Status (19)

Country Link
US (1) US3857204A (de)
JP (1) JPS4983092A (de)
AR (1) AR196813A1 (de)
AU (1) AU475946B2 (de)
BE (1) BE807499A (de)
BR (1) BR7309152D0 (de)
CA (1) CA988720A (de)
CH (1) CH555726A (de)
CS (1) CS175462B2 (de)
DD (1) DD109821A5 (de)
DE (1) DE2359024C3 (de)
ES (1) ES420155A1 (de)
FR (1) FR2208322A5 (de)
GB (1) GB1423882A (de)
IL (1) IL43101A (de)
IT (1) IT998844B (de)
NL (1) NL7315977A (de)
SE (1) SE404665B (de)
SU (1) SU550964A3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070653A (en) * 1989-06-16 1991-12-10 Ran Can Corp. Centerless valve regrinder
CN105382638A (zh) * 2015-11-30 2016-03-09 新乡学院 全自动微型研磨机及使用该研磨机加工工件的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60161544U (ja) * 1984-04-04 1985-10-26 前野　博文 センタレススルフイ−ド型ラツプ盤

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1452508A (en) * 1921-08-20 1923-04-24 American Car & Foundry Co Machine for grinding valves
US1864376A (en) * 1931-05-18 1932-06-21 D D Amis Disk grinder and polisher
US2195049A (en) * 1936-11-16 1940-03-26 Chrysler Corp Lapping apparatus
US2939253A (en) * 1958-04-28 1960-06-07 Woodruff & Stokes Company Centerless grinding and boring apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1452508A (en) * 1921-08-20 1923-04-24 American Car & Foundry Co Machine for grinding valves
US1864376A (en) * 1931-05-18 1932-06-21 D D Amis Disk grinder and polisher
US2195049A (en) * 1936-11-16 1940-03-26 Chrysler Corp Lapping apparatus
US2939253A (en) * 1958-04-28 1960-06-07 Woodruff & Stokes Company Centerless grinding and boring apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070653A (en) * 1989-06-16 1991-12-10 Ran Can Corp. Centerless valve regrinder
CN105382638A (zh) * 2015-11-30 2016-03-09 新乡学院 全自动微型研磨机及使用该研磨机加工工件的方法

Also Published As

Publication number Publication date
CH555726A (de) 1974-11-15
DD109821A5 (de) 1974-11-20
SU550964A3 (ru) 1977-03-15
GB1423882A (en) 1976-02-04
IL43101A0 (en) 1973-11-28
BR7309152D0 (pt) 1974-08-29
JPS4983092A (de) 1974-08-09
FR2208322A5 (de) 1974-06-21
SE404665B (sv) 1978-10-23
CA988720A (en) 1976-05-11
DE2359024C3 (de) 1978-10-12
CS175462B2 (de) 1977-05-31
BE807499A (fr) 1974-03-15
NL7315977A (de) 1974-05-29
AR196813A1 (es) 1974-02-19
DE2359024A1 (de) 1974-05-30
DE2359024B2 (de) 1978-01-26
IL43101A (en) 1977-02-28
IT998844B (it) 1976-02-20
AU475946B2 (en) 1976-09-09
AU6008973A (en) 1975-03-06
ES420155A1 (es) 1976-04-01

Similar Documents

Publication Publication Date Title
GB1450710A (en) Machine for producing aspherical surfaces
GB1361715A (en) Cam grinding
US3857204A (en) Centerless grinding apparatus
US3834085A (en) Method and apparatus for forming a cabochon
US2436527A (en) Machine tool
US2855729A (en) Grinding machine
US3392494A (en) Grinding devices
GB973642A (en) Improvements in or relating to the shaping of the edges of spectacle glasses
US2039223A (en) Cutting or surfacing machine
US3673742A (en) Lapidary machine
US4463524A (en) Indexable insert grinding machine
US1326462A (en) Automatic die-grinder.
US1791713A (en) Centerless grinder
ES364144A1 (es) Perfeccionamientos introducidos en las maquinas de pulir bordes.
JPH01257556A (ja) バリ取り装置
US2056149A (en) Truing apparatus
US2511449A (en) Engraver's tool sharpening machine
US2159336A (en) Lapping machine
US2637145A (en) Machine for forming arcuate contours
US4263754A (en) Shaping an arcuate surface on a wheel blank
US2701433A (en) Machine tool
US2300481A (en) Machine tool
US2858649A (en) Radius-grinding apparatus
GB840647A (en) Improvements in or relating to grinding machines
US3763727A (en) Spring loaded eccentric turning tool