EP0120652A2 - Procédé et dispositif de rectification d'alésages - Google Patents

Procédé et dispositif de rectification d'alésages Download PDF

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Publication number
EP0120652A2
EP0120652A2 EP84301746A EP84301746A EP0120652A2 EP 0120652 A2 EP0120652 A2 EP 0120652A2 EP 84301746 A EP84301746 A EP 84301746A EP 84301746 A EP84301746 A EP 84301746A EP 0120652 A2 EP0120652 A2 EP 0120652A2
Authority
EP
European Patent Office
Prior art keywords
bore
passage
honing
wall
tool
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.)
Ceased
Application number
EP84301746A
Other languages
German (de)
English (en)
Other versions
EP0120652A3 (fr
Inventor
Ronald E. Menig
William G. Corley
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.)
Ex-Cell-O Corp
Original Assignee
Ex-Cell-O Corp
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 Ex-Cell-O Corp filed Critical Ex-Cell-O Corp
Publication of EP0120652A2 publication Critical patent/EP0120652A2/fr
Publication of EP0120652A3 publication Critical patent/EP0120652A3/fr
Ceased 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
    • B24B33/10—Accessories
    • 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
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes

Definitions

  • the present invention relates to the machining of a bore in a workpiece and, in particular, to the machining with an expandable tool of a thin wall defining a bore in a workpiece and separating the bore from an adjacent passage.
  • the cylinder bores are subjected to a honing operation to provide bore dimensions within very close tolerances.
  • the maintenance of bore dimensions within the required tolerance range has sometimes been difficult especially when the cylinder block is designed and cast to have relatively thin walls separating the bores from adjacent coolant passages primarily for weight reduction purposes.
  • This difficulty has been compounded when the cross-section of the wall varies considerably from one location to another as a result of engine design considerations or core shift when casting the engine block.
  • the honing stones are expanded radially against the bore wall to exert an abrading action thereon, a honing pressure in the range of 100 to 400 psi, typically 200-250 psi, being used.
  • This tool expansion force has caused thin bore walls or thin portions thereof to be distorted during honing, resulting in finished bore geometry out of required tolerances.
  • U.S. Patent 3,542,354 issued Nov. 24, 1970 to P. Fitzpatrick and U.S. Patent 3,751,050 issued Aug. 7, 1973 to I. W. Wades et al. disclose so-called workpiece chucks or fixtures for holding a cylindrical cylinder liner during a machining operation such as honing without distorting the cylinder liner.
  • Each patent uses an expansible component to grip and hold the workpiece around its exterior in response to fluid pressure exerted on the expansible component.
  • These patents seek to minimize distortion of the cylinder liner workpiece caused by the clamping or fixturing means.
  • the present invention relates to a method and apparatus for machining a workpiece bore, in particular a thin bore wall separating a workpiece bore from another adjacent passage such as a coolant passage and the like, with a tool expandable against the thin wall wherein pressurizing means applies a fluid pressure to the adjacent passage in the workpiece during machining acting to exert a force or pressure on the thin wall counter to the distorting force of the expandable tool against the wall. Distortion of the thin wall is thereby substantially reduced during machining to provide a more accurate machined bore geometry.
  • the coolant jacket or passages of an engine block are fluid pressurized to a pressure level of for example 30 psi during honing of the cylinder bores to substantially reduce distortion of thin cylinder walls by the expansion force of the honing tool thereagainst. Considerable improvement in bore geometry has been achieved in this manner.
  • Fig. 1 illustrates a partial cross-section through a typical engine block 10 including cylinder bores 12 defined by walls 14 having relatively thick portions 14a at the top end and relatively thin portions 14b therebelow. It is apparent that the walls 14 may vary in cross-sectional shape or dimension along their lengths. The thin walls 14b terminate at their bottom ends in thicker support walls 15 which are not honed. As is apparent, the thin walls 14 separate the cylinder bores from adjacent coolant passages 16 formed in the engine block.
  • Figs. 2-4 show an apparatus for use in the invention comprising a simulated cylinder head 20 adapted to be bolted to the engine block.
  • the head includes a plurality of holes 22 for receiving standard bolts (not shown) and a bottom surface 24 to rest against the top surface 26 of the engine block and close off the coolant passages in known manner where the passages open to the top surface 26.
  • a resilient gasket 28 is interposed between head surface 24 and block surface 26 to provide a fluid pressure tight seal therebetween.
  • the head 20 also includes a plurality of bores 30 coaxially aligned with the cylinder bores 12, the head bores 30 being slightly greater in diameter than the cylinder bores to allow entry of the honing tools 34 to the cylinder bores for the honing operation.
  • Honing tools used in the method of the invention are commercially available and include a plurality of abrasive stones 35 or an abrasive sleeve expandable radially outward by various means such as tapered arbors, to engage and contact the bore wall at a selected honing pressure to effect honing, usually in the range of 100 psi to 400 psi, typically 200 psi to 250 psi.
  • the apparatus also includes a cover 36 bolted over the water pump opening 38 in the front side of the engine block.
  • a resilient gasket 40 is placed between the cover 36 and engine block to provide a fluid pressure tight seal therebetween.
  • all other side or lateral openings 44 in the engine block extending to the coolant jacket or passages are plugged fluid pressure tight by expandable plugs 46 or other means.
  • a conduit 50 is attached to the engine block at the engine temperature thermocouple opening 52.
  • the conduit is connected to a suitable source 54 of pressurized fluid such as pressurized liquid or gas.
  • Honing trials using the above-described apparatus were carried out using air pressure of 30 psi introduced into the coolant passages 16 from a conventional pressurized air source and using a pressure regulator 56 in the air supply conduit 50 to the block 10.
  • the coolant used in the honing operation could also be used as the pressurized fluid (from source 54).
  • Table I shows the roundness deviation of bores in a 4-cylinder automobile cast iron engine before honing by the invention and afterwards. Honing was carried out using an expandable honing tool with 9 abrasive stones of 230 grit with approximately 200 psi hone pressure during a 33-second honing stage followed by a hone pressure of approximately 80 psi during a 5-second run-out stage. Roundness measurements were taken with a commercially available "Talyrond" gage at the top, center and bottom of each cylinder bore in known fashion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP84301746A 1983-03-25 1984-03-14 Procédé et dispositif de rectification d'alésages Ceased EP0120652A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47905283A 1983-03-25 1983-03-25
US479052 1983-03-25

Publications (2)

Publication Number Publication Date
EP0120652A2 true EP0120652A2 (fr) 1984-10-03
EP0120652A3 EP0120652A3 (fr) 1986-01-15

Family

ID=23902473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301746A Ceased EP0120652A3 (fr) 1983-03-25 1984-03-14 Procédé et dispositif de rectification d'alésages

Country Status (3)

Country Link
EP (1) EP0120652A3 (fr)
JP (1) JPS59232765A (fr)
CA (1) CA1214057A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105290967A (zh) * 2015-11-25 2016-02-03 安徽理工大学 薄壁圆管内孔珩磨夹具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5863102B2 (ja) * 2011-10-31 2016-02-16 ダイハツ工業株式会社 シリンダブロックのボア加工方法及びこれに用いられるダミーヘッドユニット

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832653A (en) * 1954-09-03 1958-04-29 Wilson John Hart Cylinder assembly
BE666463A (fr) * 1965-07-06 1965-11-03
US3557492A (en) * 1969-06-25 1971-01-26 Barnes Drill Co Clamping fixture for a machine tool
FR2075482A5 (fr) * 1970-01-24 1971-10-08 Gehring Christoph
DE2810322C2 (de) * 1978-03-10 1982-11-25 Peter 7442 Neuffen Nagel Honmaschine
US4290236A (en) * 1979-05-14 1981-09-22 Caterpillar Tractor Co. Method and apparatus for manufacturing a contoured internal diameter bushing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105290967A (zh) * 2015-11-25 2016-02-03 安徽理工大学 薄壁圆管内孔珩磨夹具

Also Published As

Publication number Publication date
EP0120652A3 (fr) 1986-01-15
JPS59232765A (ja) 1984-12-27
CA1214057A (fr) 1986-11-18

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Effective date: 19880821

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MENIG, RONALD E.

Inventor name: CORLEY, WILLIAM G.