US3715790A - Method of reinforcing piston ring grooves - Google Patents

Method of reinforcing piston ring grooves Download PDF

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Publication number
US3715790A
US3715790A US00106279A US3715790DA US3715790A US 3715790 A US3715790 A US 3715790A US 00106279 A US00106279 A US 00106279A US 3715790D A US3715790D A US 3715790DA US 3715790 A US3715790 A US 3715790A
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United States
Prior art keywords
blank
groove
piston
temperature
metal
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
US00106279A
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English (en)
Inventor
W Reinberger
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.)
Northrop Grumman Space and Mission Systems Corp
Original Assignee
TRW Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/22—Rings for preventing wear of grooves or like seatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
    • B23K35/002—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of light metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel
    • F05C2201/046—Stainless steel or inox, e.g. 18-8
    • 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
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49263—Piston making with assembly or composite article making by coating or cladding
    • 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
    • Y10T29/49265—Ring groove forming or finishing
    • 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
    • Y10T29/49718—Repairing
    • Y10T29/49746—Repairing by applying fluent material, e.g., coating, casting

Definitions

  • Field of the Invention is in the field of reinforcing ring grooves in aluminum alloy pistons by a sequence of operations including preheating the piston blank, grit blasting the blank in the area of the grooves to remove any existing oxide film and to roughen the surface, after which the temperature of the blank is adjusted to a value between about 330 and 390 F., whereupon a bonding metal is sprayed into the grooves, followed substantially immediately by spraying a wear resistant metal such as stainless steel into the grooves.
  • the present invention is concerned with the second of the techniques mentioned above, that of spraying a wear resistant metal into a groove which has been preformed in the head of the piston.
  • an aluminum alloy piston is first provided with a peripheral groove of a stepped configuration.
  • the grooved piston is preheated at a temperature of about 400 F., but below the softening temperature of the metal of the piston alloy blank.
  • the groove is subjected to grit blasting to remove any oxides which would otherwise interfere with the bonding operation and to simultaneously roughen the surface.
  • the next step consists of spraying on a bonding metal over the surface of the groove while the blank is still at a temperature of about 300 to 390 F.
  • FIG. 1 is a fragmentary view of a portion of the head of the piston blank with a peripheral groove machined therein;
  • FIG. 2 is a somewhat schematic illustration of the manner in which the groove is grit blasted
  • FIG. 3 is another somewhat schematic view illustrating the manner in which the metal spraying operations can be used to provide both the bonding metal and the wear resistant metal in the groove;
  • FIG. 4 is a view similar to FIG. 1, but showing the head of the piston after the machining operation has been completed.
  • reference numeral 10 indicates generally a piston blank composed of an aluminum alloy.
  • the head of the piston is first provided with a peripheral groove 11 which in the form of the invention illustrated, has a stepped profile. While the configuration of the groove can take various forms, there are certain considerations which dictate the use of the stepped-type profile. For one,'the cost of the sprayed meta'l inlay should be kept as low as possible, so that the volume and the maximum thickness of the sprayed metal should be held to a minimum consistent with the required physical properties. By holding the thickness of the deposit to .a minimum, the residual stress level in the deposited metal is also minimized.
  • the minimum thickness of sprayed metal on each side of the ring groove must be great enough to support the loads imposed by the piston ring.
  • the sprayed metal must extend into the groove to a depth that will provide a wear resistant surface over the area where the'ring loading is most severe. From experience, it has been determined that pistons for heavy duty engines require a sprayed metal reinforcement with a minimum thickness of about 0.060 to 0.100 inch over the outer one-half to two-thirds of the ring groove depth.
  • the groove should be so shaped as to avoid tension loads on the bond between the sprayed metal and the piston alloy. Since the gas pressure loads and the friction loads on the piston ring are parallel to the axis of the piston, the groove should be designed with surfaces both parallel to and perpendicular to the center line of the piston. The resulting perpendicular surfaces of the groove should be joined by a small radius since sprayed metal particles tend to bridge across a sharp corner and leave an undesirable void.
  • the piston blank is washed to remove all oils and residue.
  • Various degreasing solvents such as trichlorethylene can be used for this purpose. The washing prevents contamination of the grit and grit blasting equipment used in the subsequent operation, and insures a clean surface for receiving the sprayed metal.
  • the next step in the process consists in preheating the workpiece to a temperature of about 400 F., but below the softening point of the metal to remove all residual moisture and to prevent the formation of a condensate in the subsequent operation.
  • this preheat temperature is preferably in the range from about 400 to 420F.
  • the next step of the process consists in grit blasting the surfaces of the groove.
  • the grit may be applied through a pair of nozzles 12 and 13 disposed on opposite sides of the blank.
  • the piston blank is mounted on a suitable turntable rotated at a relatively slow speed about 75 revolutions per minute.
  • the piston blank groove is blasted on both sides simultaneously at an angle of 45 from the normal to all surfaces of the stepped groove. The blast is continued until a satiny finish of maximum uniform roughness on all surfaces of the groove is achieved.
  • the bond coat is sprayed onto the groove by means of a metallizing gun 14 while the blank is oscillated to fill the groove completely, as illustrated by the dashed lines in FIG. 3.
  • a bond coat consisting of nickel aluminide since this material forms a non-porous coating which is resistant to gaseous atmospheres up to about 3,200 F.
  • the preferred coating thickness for the bonding layer is about 0.004 to 0.006 inch.
  • Nickel aluminide coatings can be produced from commercial materials which are formed of composite particles in the form of a wire.
  • the composite particles are formed by chemically depositing nickel onto aluminum particles. When fused and sprayed, there is an exothermic reaction with the formation of nickel aluminide.
  • the nickel aluminide is self-bonding to properly prepared surfaces, and no subsequent fusion treatment is required.
  • the next step consists in spraying the wear resistant metal to fill the groove 11 while the piston blank is still hot.
  • the workpiece should still be a temperature of about at least 330 to 390 F. to minimize the residual stress level in the sprayed metal inlay when thermal equilibrium is established.
  • the application of the wear resistant inlay can be made with the same type of apparatus as illustrated in FIG. 3m
  • a cooling air jet can be directed on the inner surfaces of the piston.
  • the piston is machined to remove excess reinforcement metal and to trim the piston to final dimensions.
  • the final step consists in machining a groove 16 in the reinforcement metal for receiving the piston ring.
  • EXAMPLE An aluminum alloy piston blank is provided with a groove of the type shown in FIG. 1 of the drawings. After washing to remove oils and residue, the piece was preheated to a temperature of 400 F. to remove all residual moisture and prevent the formation of condensate.
  • the piece was hot, it was grit blasted using a cast iron grit at a pressure of 80 pounds psi while the piece was rotated on a horizontal turntable at a speed of 75 revolutions per minute.
  • the piece was fixtured on the turntable so that both sides of the groove could be blasted simultaneously at an angle of 45 from the normal to all surfaces of the stepped groove.
  • the blasting was continued for 8 seconds at a spacing of 3 inches between the nozzles and the workpiece at point of contact.
  • a nickel aluminide bond coat was applied.
  • the workpiece was mounted in the fixture and rotated at 125 rpm.
  • a standard Metco" metallizing gun was used, using a one-eighth inch diameter wire. The gun was positioned 4 inches from the surface to be coated.
  • the acetylene pressure was set at 17 psi and the oxygen pressure was set at 50 psi.
  • Gun settings for the metallizing gun were adjusted to provide air at psi and 43 cubic feet per hour, oxygen at 40 to 42 psi and 42 cubic feet per hour, acetylene at 12 to 14 psi and 34 cubic feet per hour, using a wire speed of 3 feet per minute.
  • the workpiece was oscillated from side to side through an included angle of for 9 seconds at approximately I second intervals causing the sprayed metal to impinge on first one side of the groove and then on the other.
  • the groove was filled with a stainless steel spray coating using the same fixture and spray gun as used in providing the bond coat.
  • the workpiece at this stage should still have a temperature of at least 330 F., but not more than 390 F.
  • the gun was positioned 4 inches from the surface to be coated.
  • the gun settings were such that the air pressure was 55 pounds psi and 40 cubic feet per hour.
  • the oxygen setting- was such that the pressure was 30 to 34 psi with a volumetric rate of 37 cubic feet per hour.
  • the acetylene was introduced under a pressure of 15 pounds psi with a volume rate of 37.5 cubic feet per hour.
  • the wire speed was 4.5 feet per minute for a one-eighth inch wire diameter.
  • the workpiece was oscillated through an included angle of 60 starting with spraying the left side of the groove for 5 seconds followed by the right side of the groove for 5 seconds. This sequence was repeated for two additional 5 second intervals. Then the left side was sprayed for 30 seconds, followed by spraying the right side for the same interval of time. Then the spray was allowed to dwell on the center of the groove for a period of 100 seconds. Next, the left side was sprayed for seconds followed by an equal amount of spraying on the right side. The spraying was completed by training the gun on the center of the groove for 35 seconds or as long as required to completely fill the groove. During this spraying of the stainless steel, a cooling air jet was played on the inner surfaces of the piston to prevent the temperature of the piston from exceeding 390 F.
  • the piston was given a finished machining operation in the usual way, using a relatively light cutting tool pressure to machine the piston ring groove in the sprayed metal inlay.
  • the method of making an aluminum alloy piston with a ring groove reinforcement which comprises providing a piston blank having a peripheral groove formed therein, heating said blank to a temperature in the range from 330 to 390 F., spraying a bonding metal over the surface of said groove while the temperature of the blank is in said range, and thereafter spraying a wear resistant metal into said groove to fill the same while said blank is at a temperature within said range.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US00106279A 1971-01-13 1971-01-13 Method of reinforcing piston ring grooves Expired - Lifetime US3715790A (en)

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US10627971A 1971-01-13 1971-01-13

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FR (1) FR2122224A5 (enExample)
IT (1) IT946505B (enExample)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875634A (en) * 1971-02-08 1975-04-08 Nippon Piston Ring Co Ltd Process for producing an oil seal to be applied to the rotary piston engine
US3914574A (en) * 1973-10-01 1975-10-21 Wellworthy Ltd Fabricated piston with sprayed groove
US4045591A (en) * 1974-07-19 1977-08-30 Rodco, Inc. Method of treating sucker rod
US4172155A (en) * 1977-05-27 1979-10-23 British Steel Corporation Surfacing circular-section metal members
US4233490A (en) * 1979-06-20 1980-11-11 Shalai Alexandr N Method of reinforcing aluminium alloy piston ring groove
US5080056A (en) * 1991-05-17 1992-01-14 General Motors Corporation Thermally sprayed aluminum-bronze coatings on aluminum engine bores
USRE33876E (en) * 1975-09-11 1992-04-07 United Technologies Corporation Thermal barrier coating for nickel and cobalt base super alloys
US5141656A (en) * 1990-03-26 1992-08-25 Rountree Philip L Process for coating machine parts and coated machine parts produced thereby
US5230815A (en) * 1990-03-26 1993-07-27 Rountree Philip L Process for coating machine parts and coated machine parts produced thereby
US5624717A (en) * 1992-11-27 1997-04-29 Snmi-Societe Nouvelle De Metallisation Industrie Process for coating or hardfacing a part by means of a plasma transferred arc
EP0806549A1 (en) * 1996-05-03 1997-11-12 Fuji Oozx Inc. Tappet in an internal combustion engine and a method of manufacturing it
EP0828060A3 (en) * 1996-09-05 1998-06-10 Fuji Oozx Inc. Method of forming a tappet in an internal combustion engine
US20020143404A1 (en) * 1996-09-30 2002-10-03 Brainbase Corporation Implant with bioactive particles stuck and method of manufacturing the same
US6546626B2 (en) * 2000-09-13 2003-04-15 Federal-Mogul Nürnberg GmbH Method of producing a piston
WO2003062622A1 (de) * 2002-01-22 2003-07-31 Man B & W Diesel A/S Verfahren zum versehen eines grossmaschinenbauteils mit einem schutzbelag
US6671943B1 (en) * 1994-06-06 2004-01-06 Toyota Jidosha Kabushiki Kaisha Method of manufacturing a piston
US20050199196A1 (en) * 2004-03-15 2005-09-15 Miguel Azevedo High strength steel cylinder liner for diesel engine
US20110138596A1 (en) * 2008-03-19 2011-06-16 Katsumi Namba Method of repairing member
US20110186003A1 (en) * 2008-06-20 2011-08-04 Peter Konrad Method for producing a piston for an internal combustion engine and piston for an internal combustion engine
US20140342187A1 (en) * 2013-05-14 2014-11-20 Caterpillar Inc. Remanufactured cast iron component with steel outer layer
US20160245222A1 (en) * 2013-09-23 2016-08-25 Mahle International Gmbh Piston with a piston ring groove, in particular a compression groove

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1000189B (el) * 1990-01-18 1992-01-20 Nikolaos Roditis Ανανεωση δια της αναγομωσεως των κεφαλων εμβολων των αργοστροφων προωστηριων μηχανων πλοιων και δια της σκληρης επιχρωμιωσεως των πλευρων των αυλακων.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833668A (en) * 1954-06-10 1958-05-06 John Altorfer Method of bonding aluminum to a metal
US3031330A (en) * 1959-01-08 1962-04-24 Hornick Frank Method of bonding an outer coating of one metal to a base surface of aluminum or the like
US3033705A (en) * 1956-08-13 1962-05-08 Gen Motors Corp Method of applying an aluminum coating on ferrous metal article
US3041116A (en) * 1955-02-01 1962-06-26 Darlite Corp Piston construction
US3295198A (en) * 1964-03-13 1967-01-03 Robert L Coan Process of adhering stainless steel to aluminum and products produced thereby
US3405610A (en) * 1965-07-14 1968-10-15 Wellworthy Ltd Piston having spray coated inlay

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833668A (en) * 1954-06-10 1958-05-06 John Altorfer Method of bonding aluminum to a metal
US3041116A (en) * 1955-02-01 1962-06-26 Darlite Corp Piston construction
US3033705A (en) * 1956-08-13 1962-05-08 Gen Motors Corp Method of applying an aluminum coating on ferrous metal article
US3031330A (en) * 1959-01-08 1962-04-24 Hornick Frank Method of bonding an outer coating of one metal to a base surface of aluminum or the like
US3295198A (en) * 1964-03-13 1967-01-03 Robert L Coan Process of adhering stainless steel to aluminum and products produced thereby
US3405610A (en) * 1965-07-14 1968-10-15 Wellworthy Ltd Piston having spray coated inlay

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875634A (en) * 1971-02-08 1975-04-08 Nippon Piston Ring Co Ltd Process for producing an oil seal to be applied to the rotary piston engine
US3914574A (en) * 1973-10-01 1975-10-21 Wellworthy Ltd Fabricated piston with sprayed groove
US4045591A (en) * 1974-07-19 1977-08-30 Rodco, Inc. Method of treating sucker rod
USRE33876E (en) * 1975-09-11 1992-04-07 United Technologies Corporation Thermal barrier coating for nickel and cobalt base super alloys
US4172155A (en) * 1977-05-27 1979-10-23 British Steel Corporation Surfacing circular-section metal members
US4233490A (en) * 1979-06-20 1980-11-11 Shalai Alexandr N Method of reinforcing aluminium alloy piston ring groove
US5141656A (en) * 1990-03-26 1992-08-25 Rountree Philip L Process for coating machine parts and coated machine parts produced thereby
US5230815A (en) * 1990-03-26 1993-07-27 Rountree Philip L Process for coating machine parts and coated machine parts produced thereby
US5080056A (en) * 1991-05-17 1992-01-14 General Motors Corporation Thermally sprayed aluminum-bronze coatings on aluminum engine bores
US5624717A (en) * 1992-11-27 1997-04-29 Snmi-Societe Nouvelle De Metallisation Industrie Process for coating or hardfacing a part by means of a plasma transferred arc
US6671943B1 (en) * 1994-06-06 2004-01-06 Toyota Jidosha Kabushiki Kaisha Method of manufacturing a piston
EP1004753A1 (en) * 1996-05-03 2000-05-31 Fuji Oozx Inc. Tappet in an internal combustion engine and a method of manufacturing it
EP0806549A1 (en) * 1996-05-03 1997-11-12 Fuji Oozx Inc. Tappet in an internal combustion engine and a method of manufacturing it
EP0828060A3 (en) * 1996-09-05 1998-06-10 Fuji Oozx Inc. Method of forming a tappet in an internal combustion engine
US20020143404A1 (en) * 1996-09-30 2002-10-03 Brainbase Corporation Implant with bioactive particles stuck and method of manufacturing the same
US6546626B2 (en) * 2000-09-13 2003-04-15 Federal-Mogul Nürnberg GmbH Method of producing a piston
RU2300651C2 (ru) * 2002-01-22 2007-06-10 Ман Б Энд В Диесель А/С Способ нанесения защитного покрытия на деталь тяжелого машиностроения
WO2003062622A1 (de) * 2002-01-22 2003-07-31 Man B & W Diesel A/S Verfahren zum versehen eines grossmaschinenbauteils mit einem schutzbelag
CN1330872C (zh) * 2002-01-22 2007-08-08 曼B与W狄赛尔公司 用于给大型机器构件配置一个保护层的方法
US20050199196A1 (en) * 2004-03-15 2005-09-15 Miguel Azevedo High strength steel cylinder liner for diesel engine
US7726273B2 (en) 2004-03-15 2010-06-01 Federal-Mogul World Wide, Inc. High strength steel cylinder liner for diesel engine
US20110138596A1 (en) * 2008-03-19 2011-06-16 Katsumi Namba Method of repairing member
US20110186003A1 (en) * 2008-06-20 2011-08-04 Peter Konrad Method for producing a piston for an internal combustion engine and piston for an internal combustion engine
US8430077B2 (en) * 2008-06-20 2013-04-30 Federal-Mogul Nurnberg Gmbh Method for producing a piston for an internal combustion engine and piston for an internal combustion engine
US20140342187A1 (en) * 2013-05-14 2014-11-20 Caterpillar Inc. Remanufactured cast iron component with steel outer layer
US9067282B2 (en) * 2013-05-14 2015-06-30 Caterpillar Inc. Remanufacturing cast iron component with steel outer layer and remanufactured component
US20160245222A1 (en) * 2013-09-23 2016-08-25 Mahle International Gmbh Piston with a piston ring groove, in particular a compression groove

Also Published As

Publication number Publication date
IT946505B (it) 1973-05-21
FR2122224A5 (enExample) 1972-08-25

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