US1818084A - Method of grinding - Google Patents

Method of grinding Download PDF

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Publication number
US1818084A
US1818084A US274716A US27471628A US1818084A US 1818084 A US1818084 A US 1818084A US 274716 A US274716 A US 274716A US 27471628 A US27471628 A US 27471628A US 1818084 A US1818084 A US 1818084A
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US
United States
Prior art keywords
diameter
piston
grinding
axis
skirt
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
US274716A
Inventor
Adolph L Nelson
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.)
Bohn Aluminum and Brass Corp
Original Assignee
Bohn Aluminum and Brass 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 Bohn Aluminum and Brass Corp filed Critical Bohn Aluminum and Brass Corp
Priority to US274716A priority Critical patent/US1818084A/en
Priority to US275317A priority patent/US1818085A/en
Priority to FR674489D priority patent/FR674489A/en
Application granted granted Critical
Publication of US1818084A publication Critical patent/US1818084A/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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/10—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding pistons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • This invention relates to a method of grinding hollow articles, such as pistons.
  • the object of the invention is to produce a piston in which the exterior diameter of the lower end of the piston will be slightly smaller on one diameter than on a diameter at right angles thereto.
  • the smaller diameter is preferably made to coincide with the axis of the piston pin bosses.
  • Fig. 1 is an elevation of apparatus adapted carry out the invention.
  • YFig. 3 is a section on line 3-3 of Fig. 1.
  • Fig. 4. is a view similar to Fig. 3 but illus- 930 trating a modification of the process.
  • the reference numeral 10 indicates the table of a grinding machine, the driving center 11 being journaled in a bracket 12 and rotated by any suitable means such as pulley 13.
  • the opposite center 14 is journaled in the upper end of bracket 15 and is pressed toward the center 11 by an internal spring, not shown.
  • a driving pin 16 projects from 'driving lcenter 11 and is adaptedl to engage and properly position the work.
  • the piston comprises a head 17, and a skirt 18, and is formed with piston pin bosses 19 on opposite sides of the skirt.
  • the driving 'center 11 is cut away for small sectors on opposite sides as indicated at 20 and 21 on Fig. 3, and the piston is placed on the center in such a position that the cut-outs 20 and 21 lie on an axis .A -A, which is at right angles to the axis of the pin bosses.
  • the driving ,pin 16 engages a part of thepiston to maintain the piston and driving center in this relation during grinding.
  • Fig. 4 illustrates a difierent method of pro-- ducing a similar result.
  • the driving center 22 is of completely circular shape, and the support of the piston skirt is provded by ribs 23 projecting inwardly at the lower end of the skirt. These ribs extend along the skirt on the sides below the pin bosses but are discontinued for a distance about each end of axis A--A.
  • I claim: I 1. The method of finishing a hollow, cylinvdrical article Which comprises supporting the interior of an open end in such a Way as to support the wall of the article more firmly along one diameter of the article than along a second diameter at right angles to the first diameter, and then grinding the exterior of the article.
  • the method of finisliing a hollow, cylindrical article having a closed end which comprises holding a true center on the closed end, supporting the interior of the open end in such a Way as to support the wall of the article inore firmly along one diameter of the article than along a second diameter at right angles to the first diameter, and then grinding the, exterior of the article.
  • K rlllm paul-11051 (x-F Rnicling a lanllnw nvlindrical article Which comprises supporting the interior of an open end in such a Way as to support the Wall of the article more firmly along one diameter of the article than along a second diameter at an angle to the first diameter, and then grinding the exterior of the article.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

Aug- 11, 1931- A. L. NELsoN 1,818,084
OOOOOOOOOOOOOO NG P'atentecl Aug. 11, 1.931
UNITED STATES PATENT OFFICE .ADOLPH I. NE LSON', F DETROIT, MICHIGAN, ASSIGNOR TO BOHN ALUMINU M &; :BRASSf CORPORATION, 0F DETROIT, MICHIG-AN ME'rHoD or GRINDING Application filed May 3, 1928. Serial No. 274,716.
This invention relates to a method of grinding hollow articles, such as pistons.
The object of the invention is to produce a piston in which the exterior diameter of the lower end of the piston will be slightly smaller on one diameter than on a diameter at right angles thereto. The smaller diameter is preferably made to coincide with the axis of the piston pin bosses.
This object is attained by providing during the grinding operation a less firm support 'for the skirt wall at the parts that are to lie on the major axis of the skirt, thereby permitting these parts to spring inwardly and therefore lose less material during grinding. v
While preferred methods of carrying out the process have been disclosed herein, it will be clear that the process may be modified without departing from the spirit and scope V`of the invention as hereinafter set forth and claimed.
In the drawings:
Fig. 1 is an elevation of apparatus adapted carry out the invention.
Fig. 2 is a fragmentary detail of the mechanism of Fig. 1.
YFig. 3 is a section on line 3-3 of Fig. 1.
Fig. 4. is a view similar to Fig. 3 but illus- 930 trating a modification of the process.
3/ In producing pistons for internal combusi tion engines it is at times advisable to give the exterior of the open end of the piston a slightly oval shape, so that the external diameter of the skirt on the axis of the piston pin bosses and lying below said bosses, is slightly smaller than the diameter at right angles thereto. The present invention provides a simple and efficient process for giving the piston this shape when it is desired.
Referring to the drawings more particularly, the reference numeral 10 indicates the table of a grinding machine, the driving center 11 being journaled in a bracket 12 and rotated by any suitable means such as pulley 13. The opposite center 14 is journaled in the upper end of bracket 15 and is pressed toward the center 11 by an internal spring, not shown. A driving pin 16 projects from 'driving lcenter 11 and is adaptedl to engage and properly position the work.
The piston comprises a head 17, and a skirt 18, and is formed with piston pin bosses 19 on opposite sides of the skirt. The driving 'center 11 is cut away for small sectors on opposite sides as indicated at 20 and 21 on Fig. 3, and the piston is placed on the center in such a position that the cut- outs 20 and 21 lie on an axis .A -A, which is at right angles to the axis of the pin bosses. The driving ,pin 16 engages a part of thepiston to maintain the piston and driving center in this relation during grinding.
The grinding operation is'now carried out with the usual grinding tool, and it will be evident that as the tool is pressed against 'the periphery of the skirt the parts of the skirt adjacent the ends of axis A-A will give ini wardly, vand hence less material will be removed from these parts than from the parts that are solidly supported by the center 11. After the exterior of the piston has been ground to the desired extent it is removed from the grinding machine, and it will be found that the lower end of the skirt has a greater diameter on axis A-A than on the axis parallel to the axis of the pin bosses.
Fig. 4 illustrates a difierent method of pro-- ducing a similar result. In this case the driving center 22 is of completely circular shape, and the support of the piston skirt is provded by ribs 23 projecting inwardly at the lower end of the skirt. These ribs extend along the skirt on the sides below the pin bosses but are discontinued for a distance about each end of axis A--A.
VVith this construction the parts of the skrt below the pin bosses are firmly supported. by the engagement of the ribs 23 with the drving center 22, while the parts of the skirt adjacent the ends* of axis A-A have no po'stive support. And in this way the grndmg' tool will remove more material from the walls below the pin bosses than from the parts lying at the ends of axis A A. producing a finished piston which is nav. rower on the diameter Yparallel to the pin bosses at the lower end of the skirt than on the diameter ofaxis A-A.
I claim: I 1. The method of finishing a hollow, cylinvdrical article Which comprises supporting the interior of an open end in such a Way as to support the wall of the article more firmly along one diameter of the article than along a second diameter at right angles to the first diameter, and then grinding the exterior of the article.
2. The method of finisliing a hollow, cylindrical article having a closed end, which comprises holding a true center on the closed end, supporting the interior of the open end in such a Way as to support the wall of the article inore firmly along one diameter of the article than along a second diameter at right angles to the first diameter, and then grinding the, exterior of the article.
3. rl`he method of finishing a piston having a closed head and pin bosses, Which comprises holding a true center on the closed end, supporting the interior of the open end in such a way asto support the wall of the piston more firmly along adiameter parallel to the axis of the pin hosses than along a diameter at right angles to the aXis of the pin besses, and then grinding the exterior of the article.
ll. The method of finishing a piston having a closed head and pin besses, Which comprises holding a true center on the closed end, supporting the opcn'cnd With a member Which eugages the piston at points below the pin besses but which does not engage the piston at points along` a diameter at right angles to the axis of the pin bosses, and then grinding the exterior of the piston.
K rlllm paul-11051 (x-F Rnicling a lanllnw nvlindrical article Which comprises supporting the interior of an open end in such a Way as to support the Wall of the article more firmly along one diameter of the article than along a second diameter at an angle to the first diameter, and then grinding the exterior of the article.
In testimony Whereof lt afix my signature.
ADLPH L. NELSN.
luau
US274716A 1928-05-03 1928-05-03 Method of grinding Expired - Lifetime US1818084A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US274716A US1818084A (en) 1928-05-03 1928-05-03 Method of grinding
US275317A US1818085A (en) 1928-05-03 1928-05-05 Oval grinding
FR674489D FR674489A (en) 1928-05-03 1929-05-02 Oval piston lapping process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US274716A US1818084A (en) 1928-05-03 1928-05-03 Method of grinding
US275317A US1818085A (en) 1928-05-03 1928-05-05 Oval grinding

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US1818084A true US1818084A (en) 1931-08-11

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US275317A Expired - Lifetime US1818085A (en) 1928-05-03 1928-05-05 Oval grinding

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US275317A Expired - Lifetime US1818085A (en) 1928-05-03 1928-05-05 Oval grinding

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960758A (en) * 1956-09-18 1960-11-22 Albert J Granberg Method of making a spherical piston assembly for pumps of the variable displacement type and resulting spherical piston assembly
US4300274A (en) * 1977-02-02 1981-11-17 Hermann Papst Method of manufacturing connecting rod for axial cylinder-type reciprocating piston engine
EP0559935A1 (en) * 1992-03-11 1993-09-15 E.T.M. Engineers' Tool Manufacturing Company Ltd. Auxiliary device for grinding machines

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559621A (en) * 1949-12-21 1951-07-10 Armstrong Cork Co Method of forming tubular bodies with peripheral projections
US2913859A (en) * 1956-03-30 1959-11-24 Gen Motors Corp Method of making bearings
US3131473A (en) * 1959-12-31 1964-05-05 Gen Dynamics Corp Method for producing tapered and compound tapered articles
US3403482A (en) * 1966-02-25 1968-10-01 Trw Inc Adapter apparatus for resizing pistons
JP3978974B2 (en) 2000-04-03 2007-09-19 株式会社豊田自動織機 Piston in compressor and piston manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2960758A (en) * 1956-09-18 1960-11-22 Albert J Granberg Method of making a spherical piston assembly for pumps of the variable displacement type and resulting spherical piston assembly
US4300274A (en) * 1977-02-02 1981-11-17 Hermann Papst Method of manufacturing connecting rod for axial cylinder-type reciprocating piston engine
EP0559935A1 (en) * 1992-03-11 1993-09-15 E.T.M. Engineers' Tool Manufacturing Company Ltd. Auxiliary device for grinding machines

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Publication number Publication date
US1818085A (en) 1931-08-11

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