US2495492A - Apparatus for crush dressing grinding wheels - Google Patents

Apparatus for crush dressing grinding wheels Download PDF

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US2495492A
US2495492A US646314A US64631446A US2495492A US 2495492 A US2495492 A US 2495492A US 646314 A US646314 A US 646314A US 64631446 A US64631446 A US 64631446A US 2495492 A US2495492 A US 2495492A
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wheel
roll
segments
shaft
grinding
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US646314A
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John C Wilson
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Thompson Grinder Co
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Thompson Grinder Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/06Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
    • B24B53/07Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels by means of forming tools having a shape complementary to that to be produced, e.g. blocks, profile rolls

Definitions

  • This invention relates to method and apparatus for. grinding, workpieces and is especially concerned. with a method, and. apparatus for. grind.-- ing, employing a. crushing. roll for. shaping, the. grinding. wheel.
  • a grinding wheel may be shaped to a very exact configuration by'employing a crushing roll as a dressing member.
  • a crushing: rolli consists; of a metallic roll; preferably hardenedv steel; which is forced" against; the wheel. while boththe roll; and. the wheel are operating, at reduced. surface speed.
  • The: effect of suchan. operation is to crush. the bonding which. holds. the particles of.” grinding. material in the. wheel. and. thus to. transfer to. the. wheel'the configuration ofthe crushing, rolll.
  • Still another object is, to provide an improved which different parts of; the roll may rotate at,
  • Another object of the present. invention to provide a crush dressing roll. which is. divided into segments. by means of which. the shape. of'the rollimay he modified.
  • Figure L is an elevational view of a grinding machine adapted for practicing the methods of this" invention.
  • Figure 3 is; a view: showing; one type: of.” over running? clutch; adapted. f 1rconnecting; the. slow SgEfifis motor with; the: spindle strait;
  • Eigureiri isiasectionali view takem substantially; along; the: line: ie-41 offli'igure 1-.;;;.
  • drawi gs I41 indicates the bedof;agrinder'onrwhichaisrnecipnocablyrmounteet a: table I12 te be driven; by. a; motor; IL carried; in the said bed.
  • eolumm tit Connectedv with the; bedi. or" fixedly-r mounted adjacent thereto is a: eolumm tit that; supportsa saddle 1-8 for vertical. reciprocation by meansz otthe nutv and screw arrangementsat 2.0,, the said; saddle int-urn, supporting; thewheelhead; stnuetune at..- 22. which isladaptedi for; reciprocation.
  • OII the. table, l'2..a.rol1e1r generall yr indicated; at 32. which pi'rotalIy mountedi in bracket.
  • To. dressntheuwheelr 25,..the motor- 28. is, deenergi'zed'. to. bring the wheel. to. a halt and the table L2 i'sthere'after: actuated; to. bring the roller; 32 directly. under thesaid wheel.
  • Aftem-thez wheel; and; roll have:heenfedltowardleachiother;atpred etermihed' amounii; the.- rotation of the; wheel halted the dressing operation is cprhplete; Ereferahl'y; the. feeding; together; of the: wlieel"v and". 110112 takes place intermittently and the; lial'ting'of the; wheel afterdressing; takes. place; while the; said: wheel and roll; are; still" together; andilunderpressure;
  • the overrunning clutch. at fll i's:v indicated. at Figure: 3" and.v will; be; seen tozcompfisee a sleeve memher- 42f a; member (Q1. rotatable: therein and; the: rollers; 41E whichzarez; adapted. to: drivingly' interconnect the memberse 4'2 and; H. in. one
  • the workpiece 30 comprises a pair of recesses 48 and 59 which necessitates the upstanding ribs 52 and 56 on the wheel 26.
  • the wheel 26 is shown in Figure as being dressed by the crushing roller 32 and it will be noted that the ribs 52 and 54 on the wheel lie in corresponding recesses in the roll 32.
  • the actual peripheral speed of. the surfaces of the ribs 52 and 54 is considerably greater than the speed of the surfaces indicated at 56 and 58. Accordingly, if the roll 32 were formed of one piece, as is usually done, there would be slipping between the wheel and the roll at either the surface of the ribs or the surfaces 56 and -38 or both, the result being considerable wear on the roll itself.
  • this invention proposes to construct the roll 32 from a plurality of segments indicated at 60, 62, M, and 66 and to individually journal the said segments on the supporting shaft 63 as by the bearings 10.
  • the shaft 63 includes the flange 12 at one side thereof and a threaded portion which receives anut 14 at the'other side thereof.
  • the nut 14 is adapted for being located in position by the set screw 76 so that the aforementioned plurality of segments may be closely held'together while being free to rotate relatively.
  • the shaft 68 is, in turn, journalled in the bracket 32' by the bearings 78 at either end thereof.
  • Figure 6 illustrates an arrangement wherein there is a wheel 8il havingthe activeportions B2 and 84 to be dressed.
  • a roll consisting of the segments or discs, 8 6 and 88 which are separated by a spacer 9i) and'which are individually journalled by the bearings 92 and 94 on the shaft 96.
  • the spacing collar as is of such a size that the segments 86 and 88 are spaced apart exactly the required distance. properly to form the active surfaces on the wheel 80. Should it be desired or necessary to adjust the spacing of the said segments, the collar 98 may be replaced by one of a different size, or the collar Gil may include shims, the number of which may be varied for adjusting the distance between the segments.
  • FIG. 7 there is a similar arrangement whereina wheel I03 has the edge portions I02 and H54 and a central portion I66 all of which are to bedressedto a predetermined configuration.
  • the dressing roll in Figure '7 consists of theend portions I es and i ii] and the centra'lpor tions H2 all of which are individuallyjorirnalled onthe shaft 1 i4 and-closely but loosely retained thereon between the collar I I6 and nut i 18.
  • This invention then provides for a method of crushin a wheel having relatively deep grooves therearound while insuring a relatively long life of the crushing roller.
  • the method of this invention also insures greater accuracy of work- 0 pieces when the same are ground by a grinding wheel having grooves or upstanding ridges thereon by insuring that the crushing roller employed for dressing the wheel will maintain its accuracy over a long period of time.
  • This invention further provides a method for dressing a wheel by a crushing roll wherein .the configuration of the wheel may be modified without replacing the entire roll.
  • a multipart crushing roll for crush forming a grinding wheel to a predetermined contour comprising: a plurality of individual annular segments arranged side by side and each adapted for dress ing a different annular part of the wheel to be formed, said segments taken as a unit having a contour complementary to that to be formed on the wheel; and means supporting the said segments in rigid axial alignment and for free rotation relative to each other.
  • a multipart crushing roll for crush forming a grinding wheel to a predetermined contour comprising: a plurality of individual annular segments arranged side by side and each adapted for dressing a different annular part of the wheel to be formed, said segments taken as a unit having a contour complementary to that to be formed on the wheel; means supporting the said segments in rigid axial alignment and for free rotation relative to each other, and means for bringing said wheel and roll together for the simultaneous application of all of said segments to said wheel.
  • a bracket journalled in said bracket and a multipart roll carried on said shaft in fixed axial position relative to said shaft, said roll comprising a plurality of annular, segments adjacently arranged, bearing means supporting each of said segments on said shaft for individually free rotation relative thereto, said segments taken as a group being of substantially the same axial length as the part of the wheel to be dressed thereby forming a compound roller by which the wheel to be dressed can be formed by the application of said segments to the grinding wheel by a single movement of said wheel and roll relatively.
  • a device for dressing a grinding wheel a stationary bracket; a shaft carried by said bracket having a shoulder; a roll of substantially the same axial length as the part of the wheel to be dressed mounted on said shaft against said shoulder and a nut adjustable on said shaft for retaining said roll against said. shoulder, said roll being subdivided into a plurality of parts along planes at right angles to the axis of said shaft; means supporting each of said parts-on said shaft for free rotation relative thereto, each of said parts being adapted for dressing an individual annular part of said wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Description

2 Shets-Sheet l INVENTOR JOH N 0. WILSON ATTORNEY Jan. 24, 1950 J. c. WILSON APPARATUS FOR CRUSH DRESSING GRINDING WHEELS Filed Feb. 8, 1946 FIG. I
Jan. 24, 1950 I J. c. w|| soN 2,495,492
APPARATUS FOR CRUSH DRESSING GRINDING WHEELS Filed Feb. 8, 1946 2 Sheets-Sheet 2 FIG.5 26
Q v o a fii 66 FIG. 7
INVENTOIR Y JOHN 0. WILSON Patented Jan. 24, 1950 UNITED APPARATUS FGR CRUSH DRESSING. G-HINDIN G WHEELS- Appli'cwtilmzFebruary 8, 1946 SeriaIiNcn. 6463ili4e 6' Claims. 1:
This invention relates to method and apparatus for. grinding, workpieces and is especially concerned. with a method, and. apparatus for. grind.-- ing, employing a. crushing. roll for. shaping, the. grinding. wheel.
In the present grinding of! workpieces. it. has been found that a grinding wheel". may be shaped to a very exact configuration by'employing a crushing roll as a dressing member. A crushing: rolli consists; of a metallic roll; preferably hardenedv steel; which is forced" against; the wheel. while boththe roll; and. the wheel are operating, at reduced. surface speed. The: effect of suchan. operation is to crush. the bonding which. holds. the particles of." grinding. material in the. wheel. and. thus to. transfer to. the. wheel'the configuration ofthe crushing, rolll.
Ina. dressing operation. of this type; it. is important that the peripheral speeds. of the wheel and roll be. identical in order to. produce the Best results.v Whilethisis automatically accomplished. when the. roll ofa simple. configuratibnit' is. not. true when. the roll has, relatively deep grooves therein.v In such. a roll; the. wheel and. rollwill. slip relatively, at some. poiht'along' their line oi? contact and. wearingofthe roll" will resul't'lwhich will reduce the. accuracyoi. the workpiece produced' on the machines The primary object of the. present. invention is to provide. animproved' method and" apparatus for crush forming a grinding. wheel? wherein the configuration includes portions at substantially different radial distances: from the wheel axis.v
Still another object is, to provide an improved which different parts of; the roll may rotate at,
different speeds in. order to" mai'ntainthe periph-, eral speedof the roll equal to the peripheral speed of the. wheel during. adressing cycle.
It is still; another object of the present. invention to provide a crush dressing roll. which is. divided into segments. by means of which. the shape. of'the rollimay he modified.
These. and. other. objects and. advantages. he come. more apparent upoIL reference. to the. folilowing. specificationtaken together with the accompanying drawings in which:
Figure L is an elevational view of a grinding machine adapted for practicing the methods of this" invention;
FigureZ aside View of the machine of'Figure I showing. the. grinding: wheel: drive motor and. the slow speed motor which drives the grinding wheel during. the dressing cycle;
Figure 3 is; a view: showing; one type: of." over running? clutch; adapted. f 1rconnecting; the. slow SgEfifis motor with; the: spindle strait;
Eigureiri isiasectionali view takem substantially; along; the: line: ie-41 offli'igure 1-.;;.
Figure 5,-
a: view talsem substantially alongthe line: 5.--5 of: Figure: and: shows the grinding wheel. being: dressed; and! Figures: 6 and 7% are. wiewa. shnwring; different types; oti crushing. constituted. according: to: this: invention.
Refierringq tosthe; drawi gs I41 indicates the bedof;agrinder'onrwhichaisrnecipnocablyrmounteet a: table I12 te be driven; by. a; motor; IL carried; in the said bed.
Connectedv with the; bedi. or" fixedly-r mounted adjacent thereto is a: eolumm tit that; supportsa saddle 1-8 for vertical. reciprocation by meansz otthe nutv and screw arrangementsat 2.0,, the said; saddle int-urn, supporting; thewheelhead; stnuetune at..- 22. which isladaptedi for; reciprocation.
transversely in; the? saidsaddle.
Rotatable; within. the. wdieelhead 22;. by means of the shaft 24, is av g-ninding wheel 25 Theshaft 24, connected to; be: drivem air-grinding, speeds by a motor 28'; during. which time; the,- workpiece till. may he. recipnocatedl relative.- to. the. wheel. and have. ground; thereon the; confige uration. of the-wheel..
In. order. toformthe; veheefto; the. desiredishape, there. is. mounted. OII: the. table, l'2..a.rol1e1r generall yr indicated; at 32. which pi'rotalIy mountedi in bracket. To. dressntheuwheelr 25,..the motor- 28. is, deenergi'zed'. to. bring the wheel. to. a halt and the table L2 i'sthere'after: actuated; to. bring the roller; 32 directly. under thesaid wheel. The wheel; androlt are then hnoughtl together under pressure by feedingthawheel; downwardly by the nut and; screw arrangement: at; ThewheeL is drivenata reduced; speedtwhile heing. ur ed v toward the roller. 31,. the. said". driving being ac.- compIi'shedr by. a. motor 36? which; drives; throughrediictibn. gearing, 311. amoizerrunning; clutch 4 L the shaft, it. Aftem-thez wheel; and; roll have:heenfedltowardleachiother;atpred etermihed' amounii; the.- rotation of the; wheel halted the dressing operation is cprhplete; Ereferahl'y; the. feeding; together; of the: wlieel"v and". 110112 takes place intermittently and the; lial'ting'of the; wheel afterdressing; takes. place; while the; said: wheel and roll; are; still" together; andilunderpressure;
The overrunning clutch. at fll i's:v indicated. at Figure: 3" and.v will; be; seen tozcompfisee a sleeve memher- 42f a; member (Q1. rotatable: therein and; the: rollers; 41E whichzarez; adapted. to: drivingly' interconnect the memberse 4'2 and; H. in. one
direction of relative rotation and to permit free movement therebetween in the other direction of relative rotation.
Referring to Figure 4, there is shown in section the workpiece 30 and the wheel 26. It will be noted that the workpiece comprises a pair of recesses 48 and 59 which necessitates the upstanding ribs 52 and 56 on the wheel 26. The wheel 26 is shown in Figure as being dressed by the crushing roller 32 and it will be noted that the ribs 52 and 54 on the wheel lie in corresponding recesses in the roll 32. The actual peripheral speed of. the surfaces of the ribs 52 and 54 is considerably greater than the speed of the surfaces indicated at 56 and 58. Accordingly, if the roll 32 were formed of one piece, as is usually done, there would be slipping between the wheel and the roll at either the surface of the ribs or the surfaces 56 and -38 or both, the result being considerable wear on the roll itself.
In order to overcome this difiiculty, this invention proposes to construct the roll 32 from a plurality of segments indicated at 60, 62, M, and 66 and to individually journal the said segments on the supporting shaft 63 as by the bearings 10. The shaft 63 includes the flange 12 at one side thereof and a threaded portion which receives anut 14 at the'other side thereof. The nut 14 is adapted for being located in position by the set screw 76 so that the aforementioned plurality of segments may be closely held'together while being free to rotate relatively. The shaft 68 is, in turn, journalled in the bracket 32' by the bearings 78 at either end thereof.
By dividing the roll 32 into a plurality of segments, or discs, and permitting the segments to rotate freely relatively, the peripheral speed of the roller is maintained very near to that of the grinding wheel and a minimum of slippage therebetween takes place. This substantially increases the life of the roller and maintains greateraccuracy in the workpieces produced in the grinding machine." v
Figure 6 illustrates an arrangement wherein there is a wheel 8il havingthe activeportions B2 and 84 to be dressed. For dressingthese portions, there is provided a roll consisting of the segments or discs, 8 6 and 88 which are separated by a spacer 9i) and'which are individually journalled by the bearings 92 and 94 on the shaft 96. The spacing collar as is of such a size that the segments 86 and 88 are spaced apart exactly the required distance. properly to form the active surfaces on the wheel 80. Should it be desired or necessary to adjust the spacing of the said segments, the collar 98 may be replaced by one of a different size, or the collar Gil may include shims, the number of which may be varied for adjusting the distance between the segments. Thus, in Figure 6 the segments are separately journalled for independent rotation in orderto maintain their peripheral speedequal, to that of the wheel while the collar 98 provides means for adjusting the exact transverse spacing of the saidsegments and, therefore, of the active. surfaces on the,,wheel which is being dressed.
In Figure 7, there is a similar arrangement whereina wheel I03 has the edge portions I02 and H54 and a central portion I66 all of which are to bedressedto a predetermined configuration. The dressing roll inFigure '7 consists of theend portions I es and i ii] and the centra'lpor tions H2 all of which are individuallyjorirnalled onthe shaft 1 i4 and-closely but loosely retained thereon between the collar I I6 and nut i 18. The
arrangement in Figure 7 is such that the exact configuration of the wheel I00 may be varied across its entire width by replacing the segments H2, or by removing the said segments from the shaft H4 and machining off a predetermined amount from the inside surface of one or both thereof.
This invention then provides for a method of crushin a wheel having relatively deep grooves therearound while insuring a relatively long life of the crushing roller. The method of this invention also insures greater accuracy of work- 0 pieces when the same are ground by a grinding wheel having grooves or upstanding ridges thereon by insuring that the crushing roller employed for dressing the wheel will maintain its accuracy over a long period of time. This invention further provides a method for dressing a wheel by a crushing roll wherein .the configuration of the wheel may be modified without replacing the entire roll.
It will be understood that this invention is susceptible to modification in order to adopt it to different usages and conditions and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.
I claim:
1. As a new article of manufacture, a multipart crushing roll for crush forming a grinding wheel to a predetermined contour comprising: a plurality of individual annular segments arranged side by side and each adapted for dress ing a different annular part of the wheel to be formed, said segments taken as a unit having a contour complementary to that to be formed on the wheel; and means supporting the said segments in rigid axial alignment and for free rotation relative to each other.
2. As a new article of. manufacture, a multipart crushing roll for crush forming a grinding wheel to a predetermined contour comprising: a plurality of individual annular segments arranged side by side and each adapted for dressing a different annular part of the wheel to be formed, said segments taken as a unit having a contour complementary to that to be formed on the wheel; means supporting the said segments in rigid axial alignment and for free rotation relative to each other, and means for bringing said wheel and roll together for the simultaneous application of all of said segments to said wheel.
3. In a crush dressing device, a bracket; a shaft journalled in said bracket and a multipart roll carried on said shaft in fixed axial position relative to said shaft, said roll comprising a plurality of annular, segments adjacently arranged, bearing means supporting each of said segments on said shaft for individually free rotation relative thereto, said segments taken as a group being of substantially the same axial length as the part of the wheel to be dressed thereby forming a compound roller by which the wheel to be dressed can be formed by the application of said segments to the grinding wheel by a single movement of said wheel and roll relatively.
4. In a device for dressing a grinding wheel; a stationary bracket; a shaft carried by said bracket having a shoulder; a roll of substantially the same axial length as the part of the wheel to be dressed mounted on said shaft against said shoulder and a nut adjustable on said shaft for retaining said roll against said. shoulder, said roll being subdivided into a plurality of parts along planes at right angles to the axis of said shaft; means supporting each of said parts-on said shaft for free rotation relative thereto, each of said parts being adapted for dressing an individual annular part of said wheel.
5. In an apparatus for dressing a grinding wheel; a plurality of axially aligned cylindrical members and each adapted for dressing a different axial part of the periphery of a grinding wheel when pressed thereagainst; a shaft supporting said members for free individual rotation; and means retaining said members on. said shaft in a predetermined spaced relationship comprising collar means between said members, a shoulder at one end of said shaft and adjustable abutment means at the other end of said shaft; the said spaced relationship of said members corresponding to the spacing on the wheel to be dressed of the parts of the wheel the members are to dress, whereby the wheel can be completely dressed by said members in a single operation. V
6. The combination in a grinding machine for grinding workpieces having alternate ribs and recesses; of a grinding wheel having alternate ribs and recesses extending annularly therearound and a dressing roll for shaping said wheel by pressure, said roll comprising a plurality of individual segments shaped to correspond to individual annular parts of said wheel and some thereof being adapted for forming the said recesses in said wheel and other thereof being adapted for forming the said ribs on said Wheel; a shaft supporting said segments for individual free rotation about a common axis; and means retaining said segments on said shaft in rigid axial alignment with each other so that the configuration which they form as a unit is complementary to the form of the wheel to be dressed, whereby the wheel can be fully dressed by said roll in a single operation.
JOHN C. WILSON.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS 519,080 Great Britain Mar. 15, 1940
US646314A 1946-02-08 1946-02-08 Apparatus for crush dressing grinding wheels Expired - Lifetime US2495492A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811961A (en) * 1953-11-09 1957-11-05 Teno Vincent Composite grind wheel forming tool
US3491740A (en) * 1966-02-16 1970-01-27 Wheel Trueing Tool Co Rotary diamond dressing tool
US4274231A (en) * 1978-12-20 1981-06-23 Boyar-Schultz Corporation Method and apparatus for dressing a grinding wheel
DE3221395A1 (en) * 1982-06-05 1983-12-08 Werner Gerhard 6113 Babenhausen Lang Double-spindle grinding machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1536398A (en) * 1921-04-21 1925-05-05 Jabez P Kemp Process of dressing or re-forming grinding surfaces
GB465869A (en) * 1936-05-23 1937-05-18 Herbert Linder Improvements relating to profiling and dressing grinding wheels more particularly for grinding screw threads
GB519080A (en) * 1938-09-21 1940-03-15 Coventry Gauge & Tool Co Ltd Improvements in crushing rollers for forming the operative surfaces of grinding or abrading wheels
US2360127A (en) * 1943-02-23 1944-10-10 Harley Stanley Jaffa Crush-forming operation on grinding wheels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1536398A (en) * 1921-04-21 1925-05-05 Jabez P Kemp Process of dressing or re-forming grinding surfaces
GB465869A (en) * 1936-05-23 1937-05-18 Herbert Linder Improvements relating to profiling and dressing grinding wheels more particularly for grinding screw threads
GB519080A (en) * 1938-09-21 1940-03-15 Coventry Gauge & Tool Co Ltd Improvements in crushing rollers for forming the operative surfaces of grinding or abrading wheels
US2360127A (en) * 1943-02-23 1944-10-10 Harley Stanley Jaffa Crush-forming operation on grinding wheels

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811961A (en) * 1953-11-09 1957-11-05 Teno Vincent Composite grind wheel forming tool
US3491740A (en) * 1966-02-16 1970-01-27 Wheel Trueing Tool Co Rotary diamond dressing tool
US4274231A (en) * 1978-12-20 1981-06-23 Boyar-Schultz Corporation Method and apparatus for dressing a grinding wheel
DE3221395A1 (en) * 1982-06-05 1983-12-08 Werner Gerhard 6113 Babenhausen Lang Double-spindle grinding machine

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