US2729924A - Hone - Google Patents

Hone Download PDF

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Publication number
US2729924A
US2729924A US410257A US41025754A US2729924A US 2729924 A US2729924 A US 2729924A US 410257 A US410257 A US 410257A US 41025754 A US41025754 A US 41025754A US 2729924 A US2729924 A US 2729924A
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US
United States
Prior art keywords
stone
hone
stones
slots
slot
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
US410257A
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English (en)
Inventor
James B Klein
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.)
Barnes Drill Co
Original Assignee
Barnes Drill 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
Priority to BE530055D priority Critical patent/BE530055A/xx
Application filed by Barnes Drill Co filed Critical Barnes Drill Co
Priority to US410257A priority patent/US2729924A/en
Priority to FR1107774D priority patent/FR1107774A/fr
Application granted granted Critical
Publication of US2729924A publication Critical patent/US2729924A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools

Definitions

  • This invention relates to honing tools in which elongated stones or sticks of abrasive are guided for radial movement in slots angularly spaced around the tool body, expansion and contraction of the stones being controlled by a conical cam shiftable axially of the tool body.
  • the invention has more particular reference to bones of the above character in which the radial positions of the stones are maintained by friction thus avoiding the use of so-called garter springs for holding the stones.
  • the general object is to overcome the recognized shortcomings of stone mountings of the above character including inaccuracies in duplicating work bores due to yielding of the stone backing, limitation as to the amount of permissible Wear on the stone, and the danger of shearing oif parts of the stone as it enters the rough bores of successive workpieces.
  • a more detailed object is to provide for some degree of radial tilting of each stone and backing oif of the leading end as the stone enters the bore of each new workpiece.
  • Another object is to provide a honing tool having a friction type stone holder and a rigid backing for trans: mitting motion of the expanding cam directly to bottoms of the stones.
  • the invention also resides in the novel manner of applying the friction holding forces to the stones.
  • Fig. 2 is a section taken along the line 2--2 of Fig. 1.
  • Fig. 3 is a perspective view of one of the honing elements.
  • Fig. 4 is a perspective view of the friction applying device.
  • Fig. 5 is an enlarged fragmentary view similar to Fig. 1 showing the positions of the parts as the hone enters a new work bore.
  • Fig. 6 is a fragmentary side view of a modified form of the hone with parts broken away and shown in section.
  • Fig. 7 is a perspective view of the friction producing device of the hone shown in Fig. 6.
  • Figs. 8 and 9 are views similar to Figs. 6 and 7 but showing another modification.
  • a honing tool comprising an annular series of honing elements 8 angularly spaced around a hollow rotatable body 10 and mounted thereon for bodilyradial movement into engagement with the wall 9 (Fig. 1) of the work bore to be honed.
  • the body is generally cylindrical and is integral with a tubular end hub 11 coupled through the usual universal joint 12 to the end of a hollow drive l l".
  • Projecting through the spindle is the usual axially shiftable expander rod 14 carrying twoaxially. spaced conical 1 2,729,924 Patented Jan. 10, 1956 cams 15 which are disposed within the body 10 and act on follower projections 16 extending inwardly from opposite ends of expander plates 17.
  • the latter are disposed in radially opening recesses or slots 18 angularly spaced around the body 10 and having parallel side and end walls 19 and 21 between which the plates 17 are received snugly and thus guided accurately for bodily edgewise movement in radial planes.
  • endwise shifting of the plates is prevented and their radial positions closely follow changes in the position of the adjusting rod 14.
  • the cams press the plates 17 outwardly and bodily along the slots 18. After retraction of the rods and cams, the plates may be shifted inwardly.
  • the individual honing elements 8 each comprise an elongated bar or so-called stick 22 of bonded abrasive and of uniform rectangular cross section throughout its length.
  • the side surfaces of the stick are covered over substantially their entire area by thin layers .23 of nonmetallic material which wears down with the Working face 24 of the stick during honing of the bore 9.
  • the layer 23 may comprise a strip, for example of an inch thick, of thermosetting phenolic resin such for example as that sold to the trade as Insurok T640.
  • each stick and its side pieces 23 is substantially equal to the width of the body slots 18 so that the stone assembly fits closely between the slot walls 19 but is readily slidable edgewise therein.
  • each stick 22 may be similarly covered by pieces of sheet plastic, it is preferred to cover the abrasive particles with a thin film 26 as by applying varnish or suitable plastic coating material.
  • each honing element The end surfaces 26 of each honing element are flat and disposed parallel to each other and perpendicular to the hone axis so that the abrasive edge faces 24 presented to the work will remain of equal lengths in all positions of adjustment of the expanding cams and throughout the surface life of the stone. As a result, all parts of a workpiece will be honed to the same degree in a given number of strokes of the hone irrespective of the extent of wear of the stones.
  • the back surfaces 22 of the stones which are preferably coated with a thin film of shellac or other plastic material, are adapted for full contact throughout their lengths with the rigid metal backing provided by the outer edge surfaces 17 of the expander plates 17.
  • these plates are of substantial width and very rigid so that, when the follower lugs 16 at opposite ends of the plates are in contact with the expanding cams 15, all ofthe stones are supported radially by a solid unyielding backing.
  • the side walls 19 of the body slots provide equally rigid lateral support for the stones throughout the lengths of the latter and to all except the short edge portions beyond the outer periphery of the body 10. With such a mounting, a substantially greater part of the stone may be Worn away in service use before replacement is necessary.
  • the honing elements 8 are held in their respective slots by friction Which may be exerted on any part of the stone but which is preferably applied to the ends 26 of the stones and in a novel manner such as not to interfere with the desired wide range of expansion of the stones.
  • the endwise forces for deriving the necessary friction are produced by springs 30 acting on gripping devices in the form of projections 31- which bear against one of theflat ends 26 of the stone and urge the latter endwise to hold the other fi a d. against t e o pos t end.
  • the ring 32 and the fingers 'thereon are composed of resilient material so that by virtue of he e ha e fin r s f e to.
  • each finger is integral with oneend of a thin plate 44 disposed in a radially opening slot 45; in the outer end of the home body 10 and clamped against the bottom of'the slot by a screw 46 extending through a longitudinal slot 47 in the bar.
  • the plate is thus adjustable longitudinally of the slot to vary the. bending ofthe radially disposed leg of the finger and therefore the force which the offset projection 31 exerts on' the end of' the stone. in the modified form shown in Figs.
  • the projections 31 for applying endwise clamping forces to. the stones are located at the lower'or outer end of the hone and formed by the later lly offset ends of plungers 37 slidable endwise in radially opening slots 38 milled in the hone body 10 parallel to the tool axis,
  • the plungers 37 are held in the slots by a cap 39. which. fits over the reduced end of the hone body and is held thereon by suitable means such as a pin 40 received .ina bayonet slot 41 in the cap.
  • the end; of the latter forms abutments for coiled compression springs 42 disposed in the slots 38 and bearing at their other ends against the ends of the plungers 37.
  • the narrow ended fingers 3.1 are. thus urged against the ends'26 of the stones 8 at points close to the outer periphery of the hone body.
  • each honing element 8 the foregoing difficulty is eliminated through a novel correlation in the size of each honing element 8; and, its mountslightly shorter, preferably about .010 to .020 of an inch than the lengthof the stone slot18, that is, the distance between the opposed end walls 21 of the slot.
  • a clearance 52 equal to the difference in the stone and slot lengths and shown on an exaggerated scale in Fig. 5 will be left between the end wall 21 and the opposed flat end 26 of the stone.
  • This clearance even though it is small, is nevertheless sufiicient, considering the substantial length of the stone, to permit the stone to.
  • each stone is tilted inwardly n. h ne oma lly upo e agemen of. h projecting corner 5 1 with the edge of the bore. That is to say h h s on n unt r h d 5 s h hone a to nte he b r f ne rk e n up ar directed but inwardly inclined force is exerted on the corner 51 of the stone.
  • the edge 50- ofthe work acts as a cam progressively alongthe active faces of the stones so as to tilt the stones reversely until the entire length of each stone has been ing to permit some tilting ofthe stone. in a radial plane 1 and a resultant retraction of the stone into its slot- 18 when the corner 51 (Fig. 5.) of its leading end; encounters the edge 50 atthe end of the borein each succeeding workpiece to be: honed. Usually, this edgel is beveled slightly in prior boringoperations-on the-workpiece. Such I radial tilting is achieved by the making of the overall length of each. stone between the parallel end-' faces 26 pressed inwardly andout of" the way.
  • the'plunger 14 remains retracted, the expansion plates 11 being out of contact with the cams'15.
  • the stones will shift endwise in their slots 18- when the friction exerted on the active faces 24 during the honing operation issufficient to overcome the force of the springs'30.
  • Such shifting is not however detrimental in view of its short length and because the stones are at the time backedrigidly by the expansionplates.
  • a bone having, in combination, a hollow rotary od .mean .1 a d qd d hi ss hh a ed Par l el Slots a i t la l spaced.
  • a hone having, in combination, a hollow rotary body, means on said body defining elongated parallel slots angularly spaced therearound and having parallel end walls, expansion plates one extending substantially the full length of each slot and fitting snugly between said end walls thereof, a cam reciprocable along the body to engage said plates for shifting the same outwardly in said slots and to permit inward retraction of the plates, elongated abrasive elements each having parallel side and end surfaces and one guided in each of said slots for bodily edgewise adjustment with the bottom of the element contacting and backed by one of said plates, a plurality of gripping devices mounted on said body and engaging one of said surfaces of the respective elements at points spaced inwardly from the active faces of the elements, and resilient means urging said devices toward the respective element surfaces engaged thereby and each element against the opposite slot wall and having suflicient strength to create between such opposite Wall and the element enough friction to retain the radial position of the element when said cam is retracted.
  • a hone having, in combination, a hollow rotary body, means on said body defining elongated parallel slots angularly spaced therearo-und and having parallel end walls, rigid expansion plates one extending substantially the full length of each slot and fitting snugly between said end walls thereof, a cam reciprocable along the body to engage said plates for shifting the same outwardly in said slots and to permit inward retraction of the plates, elongated abrasive elements each having flat parallel ends and one guided in each of said slots for bodily edgewise adjustment with the bottom of the element backed by the one of said plates in the slot, a plurality of gripping devices mounted on said body and engaging the respective elements at points spaced from the active faces of the elements, and resilient means urging said devices against the respective elements and having sufiicient strength to create between each element and the body enough friction to retain the radial position of the element when said cam is retracted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US410257A 1954-02-15 1954-02-15 Hone Expired - Lifetime US2729924A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE530055D BE530055A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1954-02-15
US410257A US2729924A (en) 1954-02-15 1954-02-15 Hone
FR1107774D FR1107774A (fr) 1954-02-15 1954-06-30 équipage à meulettes pour la rectification d'alésages cylindriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US410257A US2729924A (en) 1954-02-15 1954-02-15 Hone

Publications (1)

Publication Number Publication Date
US2729924A true US2729924A (en) 1956-01-10

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Application Number Title Priority Date Filing Date
US410257A Expired - Lifetime US2729924A (en) 1954-02-15 1954-02-15 Hone

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Country Link
US (1) US2729924A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE530055A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1107774A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394502A (en) * 1964-03-30 1968-07-30 Mid West Abrasive Co Solid abrasive article and method of making honing elements therefrom
US3998011A (en) * 1975-10-06 1976-12-21 Ex-Cell-O Corporation Honing tool
EP1201363A3 (en) * 2000-09-28 2003-12-17 Toyo Company Limited Honing tool

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1499556A (en) * 1923-01-28 1924-07-01 Frederick T Knight Cylinder grinder
US1601813A (en) * 1923-01-04 1926-10-05 William F Emerson Device for honing internal cylindrical surfaces
US2265377A (en) * 1939-05-22 1941-12-09 Micromatic Hone Corp Encased abrasive element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1601813A (en) * 1923-01-04 1926-10-05 William F Emerson Device for honing internal cylindrical surfaces
US1499556A (en) * 1923-01-28 1924-07-01 Frederick T Knight Cylinder grinder
US2265377A (en) * 1939-05-22 1941-12-09 Micromatic Hone Corp Encased abrasive element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394502A (en) * 1964-03-30 1968-07-30 Mid West Abrasive Co Solid abrasive article and method of making honing elements therefrom
US3998011A (en) * 1975-10-06 1976-12-21 Ex-Cell-O Corporation Honing tool
EP1201363A3 (en) * 2000-09-28 2003-12-17 Toyo Company Limited Honing tool

Also Published As

Publication number Publication date
FR1107774A (fr) 1956-01-05
BE530055A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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