US2926651A

US2926651A - Abrasive wheel forming and dressing apparatus

Info

Publication number: US2926651A
Application number: US685295A
Authority: US
Inventors: Harold E Balsiger
Original assignee: Landis Tool Co
Current assignee: Landis Tool Co
Priority date: 1957-09-20
Filing date: 1957-09-20
Publication date: 1960-03-01
Anticipated expiration: 1977-03-01

Description

March 1, 1960 H. E. BALslGER ABRASIVE WHEEL FORMING AND DRESSING APPARATUS Filed sept. 20, 1957 5 Sheets-Sheet 1 INVENTOR HRULD E. BALS/GER BY 7L TTORNEY Marhwl, 1960 H. E. BALslGER 2,926,651

ABRASIVE WHEEL FORMING AND DRESSING APPARATUS Filed Sept. 20, 1957 s sheets-sheet 2 INVENTOR HAROLD '.BALS/'@ BY/ 27M ATTORNEY March l, 1960 H. E. BALSIGER 2,926,651

ABRASIVE WHEEL FORMING AND DRESSING APPARATUS Filed sept. 2o, 1957 5 sheetsheet :s

INVENTOR HROLD E .BALS/GEZ BY l L TQRNEY United States Patent O Applicaties september zo', 1951, Serin No; 685295 9 claims. (ci. 125;-11)

This invention relates lto dressing apparatus for abrasive wheels, particularly' wheels requiring rnded corn'ers, `(l-pending application Serial `No. 653,418, filed April 17, 1957, discloses apparatus for dressing the corners o'f the grinding wheel. It is therefore an object of this invention td provide meansfor dressing the corners lof grinding wheel, the fase of thc grinding wheel, and means for actuating the dressing devices in predetermined timed relation, Another object is to providemeans for effecting radial adjustment of the corner dressing mean s. ,l Another object isto provide a novel method of dress-y ing a grinding wheel.` i .t Figure 1 is an end elevation partly cut away tov show the relation between the corner dressing roller and the grinding wheel between the face dressing tool of the grinding wheel. Figre 2 is apartial ,sectional front elevation of the device for dressing the corners of the grinding wheel.` Figure 3 is an end elevation to show means for effeetingradialadjustmentand of theV corner dresser. Figure 4 is a hydraulic andelectric diagram.

Numeral indicates a rotatable grinding wheel.

is a fender and 12 isV a column for carrying the dressing devices. Within the'colurnn 12 is a member `13 slidably mounted for movement parallel to the axis ofthe grind-u ing wheel 10. A diamond holder lliis4 suitably attached to member 13, A diamond dressing tool' 1 5` isfrnounted in diamond holder 14. Conventional means (not shown) are provided for adjusting the diamond in a direction radially of thegrinding wheel axis. Means for traversing the diamond dressing tool 15 consists of a piston 31' in cylinderfl.

At the front oncolu'tnn 12, a b`racket20 is pivotally mounted at 2L The lower part of braeket'-` 20 has a deve tail slide 22 in which is slidably mounted a member 23. A shaft `Ziirlountcd in depending portions 2 5 of member 23 has rotatably mounted thereon a dressing roller 26 consisting of two corner dressing members 27 formed to dress a radius on the cornersof grinding wheel 1l) and an intermediate` member for engaging the grinding wheel 10 and limiting themovement of the cornerdressing members 27 re'lativet t'he'corners of grinding wheel 10. Said roller 26 is held on sleeve 29 by means of nuts 35 having notches 36 which serve to accommodate a wrench and also to act as impellers when a jet of air is directed against them for initiating the rotation of said roller.

Shaft 24, on which said roller is mounted, has a head 54 at one end. The other end of said shaft 24 is supported in sleeve 50. Said sleeve 50 and head 54 are supported for radial adjustment in a cylindrical bore 51 in each of said depending portions 25. Said bore 51 is larger than sleeve 50, head 54, and shaft 24 so that the sleeve may be adjusted radially by means of adjusting

screws

52 and 53 of which there are three for each end of shaft 24.

The function of the roller 26 might be performed 2,926,6si Paa'tented Mar. l, 196 0 Z equally well by oscillating segments and reciprocating blocks. Suchelements are mechanical equivalents of said roller. Wherever the term rollei is used in the claims, these equivalent elements are included.

The `composition of said roller may be varied to ing clude diamond or carbide impregnated surfaces. WhenV this type of roller is used, the roller and the grinding wheel rotate at different peripheral speeds inorder to effect the dressing operation. The roller may also be made of smooth o'rroughcarbides or equivalent materials. When a smooth carbide roller isused, the roller and the grinding wheel rotate at the saine peripheral speed", and

the dressing operation is performed by a crushing action.

Operation When the wheelbasev (not shown) is in the `baci( position; ,limit switch LS157 is closed. The purpose of this switch is to prevent operation of the dressing mechanism when the wheelbase is in the forward position. t LS157 connects the dressing circuit with a source of current to start the dressing operation.

The start switch is closed. This switch has two con'-4 tacts.

Contact 1 of the start switch completes a ci`r`cuiti-i through normally closed ISCR'lto energize 14Cl. 14CR3and 1 4CR4 close toenergize valve .solenoid` 1115 to direct fluid under pressure to the head` en d yof diamond traverse cylinder 30 to move piston 31 to the.

lento `mail: the first pass interesting tool l15 andante face` of the grinding wheel 10. 14CR1 by-passes contact 1 of the start switch through' normally closed 15CR1 to' hold ,14CR- f a e;

Contact 2V ofthe start switch completes a circui `ttiA energize lTR. 1TR1 completes a circuit from normally closed ZTRI to by-pass contact 2 of `the `start switch ltof, hold lTR. 1TR2 completes a'circuit through normally v closed 16CR4 to energize air valve solenoid 1 08 The valveis .shifted to direct air against the notched nuts` .35 at oneor both ends of the radius dressing roller. ,Forl a` diamond dressing operation, the surface speedvof the grinding wheel and Athe dressing tool should be different.` For aerush dressingoperatiom the surface speeds of` grinding wheel and the crushing` toolshould be the sain" f In acnish dressing operatiomthis initial .rotation avoidsV the grinding action on thecrusher which would o` c:ci i r i f the crusherhad to be started from standstill and brought up to crushing speedby contact of the grinding wheel rotating at grinding speed; l,

At the` end of therst pass of the dresser-LS'ISS is; closed` to complete a circuit to energize 15CR. I tjalso'` completes a circui'tto energize aco/unter which may,

1SCR2 completes a circuit` fion-i to`y MCR and 2TR. 16CR3 proyidesa helding circuit freni, lTRZ to 16CR and `ZTR"- Normally closed A16QR4` Opens; to. deenergize irvali/ e `solenoid 103 ,and `cnt olfuthe now Orndriving th radius" dresser; Ataris time, the pripheral speed of the roller is less than that of the grinding wheel if a diamond impregnated roller is used. If a crushing roller is used, its peripheral speed at this time is substantially the same as that of the grinding wheel. A crushing operation on a grinding Wheel, rotating at grinding speed, is performed in a few seconds and only light pressure is exerted on the crushing roller. Conventional crush dressing with the grindingl wheel rotating slowly and the crushing roller operating under high pressure, requires several minutes to complete the dressing operation.

16CR1 and 16CR2 energize radius dresser valve solenoid 107, shifting the valve to the left and directing uid under pressure to the head end of radius dresser cylinder 40. Piston 41 in said cylinder 40 moves the radius dresser roller into engagement with the grinding wheel to dress the corners ofA said wheel.

; 2TR1 opens after a predetermined interval to deenergize and reset 1TR1. 1TR2 opens and deenergizes 16CR and ZTR.

Deenergizing 16CR opens 16CR1 and 16CR2 to deenergize valve solenoid 107 which is shifted to retract the radius dressing roller from the grinding wheel 10. ZTR is reset. At the same time that the radius dressing roller was moved into engagement with grinding wheel 10, normally closed CR1 opened to 'deenergize 14CR.

14CR3 and 14CR4 open to deenergize valve solenoid said grinding wheel,4 a dressing tool for dressing the straight portion of said grinding wheel, means for travers ing said dressing toolacross said grinding wheel, control means for initiating said movement of said roller and saidv traverse movement of said dressing tool, and means including a timing device for withdrawing said roller before said dressing tool engages said grinding wheel.

2. Means for dressing a grinding wheel having a formed portion and a straight portion comprising a roller for dressing said'formedportion, means for moving said roller into and out of operative engagement with said grinding wheel, a dressing tool for dressing the straight portion of said grinding wheel, means for traversing said dressing tool across said grinding wheel, and control means for initiating said movement of said roller and said traverse movement of said dressing tool in predetermined timed relation.

3. Means for dressing a grinding wheel having a formed portion and a straight portion comprising a formed roller for dressing said former portion, means for moving said roller into and out of operative engagement with .said grinding wheel, a dressing tool for dressing the straight portion of said grinding wheel, means for traversing said dressing tool across said grinding wheel, and control means operable by said traverse means for initiating operation of said roller moving means.

Y; 4. Means for dressing a grinding wheel having a formed portion and a straight portion comprising a formed rollerl for dressing said formed portion, means for moving said roller into and out of operative engagement with said grinding wheel, a dressing tool for dressing the face of said lgrinding wheel, means for traversing said dressing tool across said grinding wheel, control means for initiating operation of said traversing means, and means operable in response to said traversing movement of said dressing tool to actuate said roller into and out of operative engagement with said grinding Wheel.

" 5. Means for dressing a grinding wheel having a formed portion while said grinding wheel is rotating at grinding speed and a straight portion comprising a formed roller for dressing said formed portion, a dressing tool for dressing the face of said grinding wheel, and means including control devices responsive to movement of said respective dressing means relative to said grinding wheel for subjecting said grinding wheel alternately to said roller and said dressing tool.

6. Means for dressing a grinding wheel having a formed portion and a straight portion comprising a formed dressing member for dressing said formed portion, means for moving said member into and out of operative engagement with said grinding wheel, a dressing tool for dressing the face of said grinding wheel, means for traversing said dressing tool across said grinding wheel, and means for actuating said forming means in response to the traversing of said dressing means.

7. In a grinding machine, a grinding wheel support, a grinding wheel rotatably mounted thereon, means for dressing the face and corners of said grinding wheel including a dressing tool and means for moving same across the face of said grinding wheel, a corner dressing tool and means for moving same into and out of engagement with said corners, and means responsive to movement of said corners, means operable when said grinding wheel is inin-operative position -for initiating movement of said dressing vtool across the `face of said grinding wheel, means operable at the end of said movement to initiate said movement in the opposite direction and also to effect movement of said corner forming tool to form said wheel corners,-and means operable after a predetermined intervalk to retract said corner forming tool.

9. Means for dressing a grinding wheel having a formed portion, comprising a roller for crush dressing said formed portion, means on said roller responsive to a stream of uid under pressure for effecting rotation of said roller at a surface speed substantially the same as that of said grinding wheel, means` operable thereafter for moving said roller into operative engagement with said grinding wheel, said means being effective also for cutting off the supply of uid under pressure so thatsaid roller is driven only by said grinding wheel, and means operable after a predetermined interval for separating said roller and said grinding wheel.

References Cited in the tile of this patent vUNITED STATES PATENTS