US3812624A - Grinding apparatus with infeed control - Google Patents

Grinding apparatus with infeed control Download PDF

Info

Publication number
US3812624A
US3812624A US00306309A US30630972A US3812624A US 3812624 A US3812624 A US 3812624A US 00306309 A US00306309 A US 00306309A US 30630972 A US30630972 A US 30630972A US 3812624 A US3812624 A US 3812624A
Authority
US
United States
Prior art keywords
abrasive disc
displacing
mounting
workpiece
abrasive
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
US00306309A
Other languages
English (en)
Inventor
E Dunn
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.)
Litton Industries Inc
Original Assignee
Litton Industries Inc
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 Litton Industries Inc filed Critical Litton Industries Inc
Priority to US00306309A priority Critical patent/US3812624A/en
Priority to GB5261973A priority patent/GB1415425A/en
Priority to JP12762773A priority patent/JPS571386B2/ja
Application granted granted Critical
Publication of US3812624A publication Critical patent/US3812624A/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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Definitions

  • a grinding apparatus comprising abrasive disc means [22] Filed; A i including at least one abrasive disc, means for mountmg the abraslve (1180 means for rotative displacement PP 306,309 about the axis of the abrasive disc means, means for rotationally displacing the abrasive disc means, means wwwvmw for axially displacing the abrasive disc means towards U-S- Cl- 5 a workpie e urface to be ground means for mounting [5 r a workpiece having at least one surface to be ground [58] Field of Search 51/1 11 R, H2, H5, 113, by the abrading action f the f f the disc, means 51/114, 215 CP, 234, 1659 for repetitively displacing the mounting means H through a first zone wherein only a portion of the V V v
  • SHEEI 2 0F 2 1 GRINDING APPARATUS WITH INFEED CONTROL This invention relates to horizontal double disc grinders for grinding opposed faces of a workpiece to within stringent tolerance limits for flatness and parallelism.
  • a feed mechanism axially advances either one or two abrasive discs continously and at a uniform infeed rate while a workpiece is repetitively displaced across the cutting face(s) of the abrasive disc(s).
  • a workpiece which is either linearly reciprocated across the abrasive discs by gun-type fixturing or rotatively oscillated along an arcuate path by an oscillating arm must be displaced at least partially into the central bore area of the abrasive disc (partially beyond the inner perimeter) where the abrasive discs include a central bore and at least partially beyond the outer perimeter of the abrasive discs to prevent .shoulderlike plateaus from being generated adjacent the inner and outer peripheries of the abrasive discs.
  • an object of the present invention to provide a grinding apparatus of the type described, wherein a substantially flat wear pattern will be achieved across the abrading faces of the abrasive discs.
  • FIG. 1 is a front perspective view of a horizontal double disc grinder constructed in accordance with the teachings of the present invention
  • FIG. 2 is a plan view illustrating the double disc grinder illustrated in FIG. 1;
  • FIG. 3 is an enlarged elevational view of a portion of the grinding apparatus of the present invention.
  • FIG. 4 is a schematic diagram showing the hydraulic controls of the present invention.
  • the double disc grinder includes left and right hand abrasive discs 12, 12, which preferably have central axially extending bores 14, 14' therein (FIG. 3) and which preferably have uniform abrasive characteristics across the parallel abrading faces thereof.
  • These discs are conventionally rotatably mounted on a pair of slides l6, 16' which are longitudinally displaceable for facecut infeed along a machine bed 18.
  • Conventional feed mechanisms 20, 20' such as are disclosed in U.S. Pat. Nos. 3,513,600, granted May 26, 1970 and US. Pat. No. 3,001,337, granted Sept.
  • the workpiece may either be a single unit wherein either a single or two opposing faces are to be ground or a pair of units wherein only a single surface of each unit will be ground.
  • the horizontal double disc grinder 10 has an arm 26, which is pivotably mounted on a rock shaft 28.
  • the rock shaft 28 is. journaled in bearings (not shown) which are housed by support brackets 30, 30' secured to the front of the bed 18.
  • a work holding paddle 32 including an opening 34 for receiving a retaining frame 36 for securely holding a workpiece W in a predetermined position, is secured to the arm 26.
  • the arm 26 is selectively displaceable from a fully retracted position P, whereat the workpiece can be conveniently secured within the workframe 36 to an intermediate partially advanced P, position wherat the surfaces of the workpiece W which are to be ground only partially overlap the abrading faces of the abrasive discs proximate the outer periphery 40 thereof and then to a fully advanced position P whereat the surfaces of the workpiece W which are to be ground only partially overlap the abrading faces of the abrasive discs at the inner periphery 42 thereof (FIG. 3).
  • th arm is rotatively displaced to the partially advanced (partially retracted) position P, and is then repetitively oscillated between positions P, and P until the workpiece-surfaces are completely ground. The arm will then be returned to the fully'retracted position P, to complete the cycle.
  • the workpiece and more particularly the surfaces of the workpiece which are to be ground are thereby repetitively and sequentially oscillated through a first zone wherein these workpiece surfaces only partially overlap the abrading faces of the grinding discs proximate the outer periphery thereof, through a second zone wherein the workpiece surfaces and the faces of the abrasive discs completely overlap and finally through a third zone wherein the workpiece surfaces only partially overlap the abrading faces of the grinding discs proximate the inner periphery thereof.
  • Facecut infeed of the abrasive discs is halted whenever the workpiece surfaces are located within the first which carries a cam 74 is mounted on the second switch plate 66.
  • This cam 74 includes sloping surfaces 76, 78 adjacent a central level portion 80.
  • a guard plate 82 is secured to the bridge plate 48 for directing the flow of coolant spray intoa drainage tank 84 and a portion 86 of the guard plate 82 forms a bracket on which first and second limit switches 88, 90'
  • Operating lever 92 of the second limit switch 90 is selectively positioned to engage camming surfaces 76, 78, 80 only when the surfaces of the workpiece which are to be ground fully overlap the abrading faces of the grinding discs whereby the infeed mechanisms 22, 22' (FIG. 3) will only be actuated while the workpiece surfaces are located within this second zone.
  • Operating lever 94 of the first limit switch 88 is selectively positioned to engage the first trip dog 68 when the arm 26 is partially retracted to position P, and is selectively positioned to engage the second trip dog 70 when the arm 26 is fully advanced to position P
  • the hydraulic system for controlling the oscillation of the arm 26 is disclosed in FIG. 4; This system includes a first two position valve 100 which is controlled by a solenoid 102.
  • valve 100 When the solenoid102 is in the unenergized state, spring 104 maintains the valve 100 in a first position, and when the solenoid is first energized through manual pushbutton control (not shown) the valve 100 is displaced against the action 'of the spring 104 to a second position which'causes paddle 32 toadvance to position P and reverse.
  • the system additionally includes a two position double channel valve 106 (shown in its first position), a plunger deceleration valve 108, and the fluid cylinder or motor 46.
  • the rotational velocity of the oscillating arm in order than the grinding surfaces which are passing past the workpiece surfaces will wear uniformly, the rotational velocity of the oscillating arm, when the work piece surfaces are being displaced through zone two, should vary with its angular position and the ratio of the rotational velocity of the arm 26 when the workpiece W is at P, to the velocity of the arm 26 when the workpiece W is at P should approximately be equal to (2R w/ (2R +w) where w is the width of workpiece W and the rotational velocity of the arm 26 should vary substantially linearly therebetween.
  • the plunger or deceleration valve 108 includes a plunger element 132 which is selectively displaceable from a retracted position to an advanced position. As this valving plunger 132 is advanced, the pressure drop through the valve is increased whereby the pressure acting on the cylinder will be reduced.
  • a cam support rail 140 is secured at one end to the oscilitable arm 26 and a pin element 142 which is secured to the housing is located within a slot 144 defined tion of paddle 32, strikes the first trip dog 68 at position P the solenoid 102 is actuated.
  • Fluid under, pressure is directed from a source 110 through fluid lines 112, 114 to the two position valve which has been shifted to its second position.
  • the pressurized fluid is passed through the valve to fluidline 116 to the second valve 106 for urging the displacement of this valve to its second position whereby a circuit will be defined therethrough by fluid lines 118, 120 into .the headend of cylinder 46.
  • This cam support rail 140 includes awedge-shaped element 148 having a substantially linear camming surface selectively inclined so that as the workpiece is displaced from P1 to P,,, the plunger element will be advanced from its retracted to its advanced position which are predetermined so as to produce piston velocity, of piston 124, at these two extreme'locations having the above defined ratio and to produce piston velocity, and hence arm 26 velocity which varies substantially linearly therebetween.
  • the arm 23 will be fully retracted when a predetermined number of oscillations are completed and the limit switch 152 will be closed to complete the grinding cycle for a single workpiece W.
  • the right hand and left hand abrasive discs 11 and 12 may be rapidly retracted by feed means 22, 22 either when the counters (not shown) time out, or when the limit switch 152 is closed.
  • the principles of the present invention are applicable to single as well as double disk grinders and is applica abrasive disc means including atleast one abrasive disc havinga central axially extending bore, means for, mounting said abrasive disc for rotative displacement about the axis of said abrasive disc,
  • a grinding apparatus according to claim 1, wherein said abrasive disc means comprises a pair of coaxial discs and said mounting means displacing means selectively displaces said mounting means intermediate said discs.
  • a grinding apparatus according to claim 1, wherein said mounting means includes an arm member and means for supporting said arm member for pivotal displacement.
  • said mounting means displacing means further comprises means for displacing said mounting means sequentially through said second and first zones precedent to displacing said mounting means sequentially through said first and second zones.
  • said mounting means displacing means further comprises means for displacing said mounting means sequentially through said third, second and first zones precedent to displacing said mounting means sequentially through said first, second and third zones.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US00306309A 1972-11-14 1972-11-14 Grinding apparatus with infeed control Expired - Lifetime US3812624A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US00306309A US3812624A (en) 1972-11-14 1972-11-14 Grinding apparatus with infeed control
GB5261973A GB1415425A (en) 1972-11-14 1973-11-13 Grinding apparatus
JP12762773A JPS571386B2 (enrdf_load_stackoverflow) 1972-11-14 1973-11-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00306309A US3812624A (en) 1972-11-14 1972-11-14 Grinding apparatus with infeed control

Publications (1)

Publication Number Publication Date
US3812624A true US3812624A (en) 1974-05-28

Family

ID=23184728

Family Applications (1)

Application Number Title Priority Date Filing Date
US00306309A Expired - Lifetime US3812624A (en) 1972-11-14 1972-11-14 Grinding apparatus with infeed control

Country Status (3)

Country Link
US (1) US3812624A (enrdf_load_stackoverflow)
JP (1) JPS571386B2 (enrdf_load_stackoverflow)
GB (1) GB1415425A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827672A (en) * 1987-04-27 1989-05-09 Buehler Ltd. Abrasive cutting wheel system
US4856232A (en) * 1987-05-07 1989-08-15 Daisyo Seiki Kabushiki Kaisha Workpiece carrier means for surface grinding machine
CN109623658A (zh) * 2018-12-26 2019-04-16 浙江杰奈尔新材料有限公司 一种研磨机用清洗装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52126492U (enrdf_load_stackoverflow) * 1976-03-24 1977-09-26

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966194A (en) * 1930-03-10 1934-07-10 Bunting Brass And Bronzc Compa Grinding machine
US2123705A (en) * 1934-10-04 1938-07-12 Carborundum Co Apparatus for cutting hard substances
US3382622A (en) * 1965-05-28 1968-05-14 Landis Tool Co Disc grinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966194A (en) * 1930-03-10 1934-07-10 Bunting Brass And Bronzc Compa Grinding machine
US2123705A (en) * 1934-10-04 1938-07-12 Carborundum Co Apparatus for cutting hard substances
US3382622A (en) * 1965-05-28 1968-05-14 Landis Tool Co Disc grinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827672A (en) * 1987-04-27 1989-05-09 Buehler Ltd. Abrasive cutting wheel system
US4856232A (en) * 1987-05-07 1989-08-15 Daisyo Seiki Kabushiki Kaisha Workpiece carrier means for surface grinding machine
CN109623658A (zh) * 2018-12-26 2019-04-16 浙江杰奈尔新材料有限公司 一种研磨机用清洗装置

Also Published As

Publication number Publication date
JPS571386B2 (enrdf_load_stackoverflow) 1982-01-11
GB1415425A (en) 1975-11-26
JPS49124695A (enrdf_load_stackoverflow) 1974-11-28

Similar Documents

Publication Publication Date Title
US3382622A (en) Disc grinder
US3581730A (en) Rotary conjugate dresser
US5551908A (en) Centerless grinder and wheel truing device therefor
US3812624A (en) Grinding apparatus with infeed control
GB1097404A (en) Automatic or semi-automatic multi-spindle grinder for diesel engine fuel nozzles and method of employing said machine
US3874122A (en) Grinding machine
US3634978A (en) Grinding machine
GB1247870A (en) Machine for simultaneously performing machining operations on the centre bore and at least one end face of a rotatable workpiece
US3593463A (en) Grinding machine
US4607607A (en) Apparatus for dressing grinding wheels
US3313285A (en) Impregnated indexing roller for grinding wheel dressers
US3000148A (en) Two-lap lapping machine
US3714741A (en) Grinding machine with size controlled dressing means
US2349786A (en) Grinding wheel feeding mechanism
US3269381A (en) Dressing assembly for grinding machine
US3688447A (en) Grinding machine
US2708816A (en) Tapered cam grinder
US2873557A (en) Grinding machine
US1684486A (en) Grinding machine
US2188675A (en) Grinding machine
US3488887A (en) Grinding machine
US3818639A (en) Apparatus for surface grinding
US3846940A (en) Double disc grinder
US3281994A (en) Surface grinder
US3411491A (en) Machining apparatus for dressing devices