EP2035170A2 - Cast steel piston for internal combustion engines - Google Patents
Cast steel piston for internal combustion enginesInfo
- Publication number
- EP2035170A2 EP2035170A2 EP07725968A EP07725968A EP2035170A2 EP 2035170 A2 EP2035170 A2 EP 2035170A2 EP 07725968 A EP07725968 A EP 07725968A EP 07725968 A EP07725968 A EP 07725968A EP 2035170 A2 EP2035170 A2 EP 2035170A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- piston
- cast
- composition
- unavoidable
- 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.)
- Granted
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0072—Casting in, on, or around objects which form part of the product for making objects with integrated channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
- F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
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- 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
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
-
- 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
- the invention relates to a cast steel piston for internal combustion engines, from a density-reduced steel alloy or a stainless steel alloy with the features of claim 1 or a partially cast from ADI or GJV and partially formed from a density-reduced steel alloy or a stainless steel alloy steel piston having the features of claim 11, and a Process for producing a one-piece and material-integral steel piston having the features of claim 14.
- DE 102 44 513 A1 discloses a method for producing a multi-part cooled piston.
- the piston top is made of heat-resistant steel and the piston base is made of forged AFP steel.
- the subsequent joining or joining of the annular rib of the upper piston part with the support rib of the piston lower part takes place by means of a welding or soldering process.
- the preparation of the parts for joining and the joining process itself represent costly process steps.
- a steel piston for internal combustion engines comprising at least one piston upper part with combustion recess and an annular wall and a piston base with connecting rod bearing, which is cast from a density-reduced steel alloy or a stainless steel alloy, with the features of claim 1 and by a steel piston which is only partially cast from a reduced density steel alloy, a stainless steel alloy, vermicular graphite (GJV) or bainitic ductile iron (ADI), having the features of claim 11.
- Another solution of the invention is by a method of making a one-piece and material-integral steel piston Low-pressure casting with the features of claim 14 given.
- the steel piston is thus cast in one piece and of the same material.
- a substantial simplification of the manufacturing process is achieved.
- the first steel alloy used according to the invention is a density-reduced steel alloy of the following composition (following data in% by weight, unless otherwise stated) Mn: 12-35 Al: 6-16 Si: 0.3-3 C: 0.8-1, 1 Ti: up to 0.03 remainder Fe and unavoidable steel accompanying elements.
- This alloy is characterized by a good flowability.
- the density of the material is comparatively low at about 6.8 g / cc.
- Another advantage of this alloy is due to the high high temperature corrosion resistance.
- the high Al content contributes especially to this corrosion resistance.
- Such alloys are also able to cope with the high mechanical requirements.
- the content of Mn and Al is in the range of Mn 18-32% and Al 8-12%.
- the further steel alloy used according to the invention is a stainless steel alloy of very good flowability with the following composition in% by weight: Mn: 3-9
- the content of Mn and Cr is in the range of Mn 4-6% and Cr is 19-22%.
- Another advantage of this alloy is excellent corrosion resistance at the high temperatures prevailing in the combustion chamber of internal combustion engines. Due to the high strength and good flowability particularly thin or filigree structures of the piston are possible.
- Fig. 1 shows a piston (1) in cross section
- Fig. 2 shows a piston (1) in cross-section, with upper part (12) and lower part (13), annular wall (5), cooling channel (4), opening of the cooling channel (7), connecting rod bearing (8), connecting rod bearing wall (9) and combustion recess (11)
- FIG. 3 shows a piston (1) in section, with upper part (12) and lower part (13), annular wall (5), cooling channel (4), closure part (6), connecting rod bearing (8), connecting rod bearing wall (9) and combustion recess (11 )
- the piston in the piston upper part (12) on one or more cooling channels (4) can be continuous, or divided into several segments. In the latter case can also be spoken by several cooling channels.
- the at least one cooling channel has openings or openings (7, 1 ') to the piston interior and / or to the annular wall (5).
- the openings or openings to the piston interior (7) serve to exchange coolant or oil. Typically, these are round holes or holes. However, other geometries can be realized as required. This is easy to accomplish, in particular, by the casting method of manufacture selected according to the invention, for example by using suitably shaped casting cores or inserts. In this case, the drilling of openings can be saved.
- the cooling channel (4) can also be interrupted towards the annular wall, so that an opening (V) is created. So that the cooling channel (4) with openings to the annular wall (5) does not remain open to the outside, it is closed by at least one closure part (6) to the outside.
- the cooling pipe system is thus constructed in several parts.
- the closure part (6) is preferably formed by a sheet metal or closure plate or a steel ring. For clamping, the closure part can protrude into the cooling channel.
- the closure member is typically welded or soldered. Breakthrough or opening (7 ') and closure part (6) are preferably arranged in the region or within an annular groove (10).
- the at least one cooling channel (4) is formed by a cast-in steel tube (3).
- the steel pipe can still be identified in the cast steel piston due to the irregularities of the structure prevailing in the border area or gate area. If the steel pipe is coated before being poured for better joining, for example with Sn, then a mixed alloy boundary region forms around the cooling channel (4).
- cooling channels (4) are completely formed by cast-in steel tubes (3) and the cooling channels (4) have no opening (7 ') towards the ring wall. They are closed to the outside and do not require a closure part (6). Preferably, openings (7) are also present here inwards.
- the cooling pipe system is thus constructed in one piece. It is possible that the steel of the piston and the steel of the cast steel pipe (3) have a different composition. Likewise, an intermediate layer may be formed between the piston and the cast-in steel tube, which has a different composition from the steel of the piston.
- the steel tubes are preferably formed from refractory steels or high-temperature steels. The use of good castable steels is not required.
- the material of the cast-in steel tube can also be the proven steels from the group MoCr4, 42CrMo4, CrMo4 or 31CrMoV6.
- the connecting rod bearing wall (9) has a bearing shell, or the connecting rod bearing wall (9) is at least partially formed by a bearing shell, which consists of a cast-in part.
- the casting, or the bearing shell formed thereby preferably consists of a highly wear-resistant steel.
- a particularly suitable material for a bearing shell can be introduced in a simple manner by casting.
- a material of the bearing shell in particular a steel from the group MoCr4, 42CrMo4, CrMo4 or 31CrMoV6 is selected. If necessary, the bearing shell can also carry special sliding coatings.
- a piston for internal combustion engines which comprises at least one piston upper part (12) with combustion bowl (11) and annular wall (5) and a piston lower part (13) with connecting rod bearing (8), wherein the piston lower part (13) consists of a density-reduced steel alloy of composition Mn: 18-35, Al: 8-12, Si: 0.3-3, C: 0.8-1.1, Ti: to 0.03, remainder Fe and unavoidable steel accompanying elements, or from one Stainless steel alloy of composition Mn: 4-6, Si: 0.3-1, C: 0.01-0.03, Cr: 19-22, Ni: 1-3, Cu: 0.2-1, N: 0 05-0,17, remainder Fe and unavoidable steel elements, or austenitic cast iron (austempered ductile iron), cast iron with vermicular graphite (GJV) or austenitic or alloyed cast iron with spheroidal graph
- the piston upper part can be manufactured in a conventional manner.
- the piston upper part (13) is a forged part.
- the material of the upper piston part is not limited to the steels of the lower part. Rather, the already proven steels can be used. Suitable steels include MoCr4, 42CrMo4, CrMo4 or 31CrMoV6.
- upper piston part (12) and lower piston part (13) takes place according to the invention by welding. Friction welding is particularly preferred.
- the dividing line between upper and lower part can run at different heights of the piston.
- the dividing line is arranged approximately at the lower end of the annular wall (5) (see FIG. 3).
- the bainitic nodular cast iron of the piston base is also referred to as austempered ductile iron (ADI) or bainitic-ferritic spheroidal graphite cast iron.
- ADI austempered ductile iron
- bainitic-ferritic spheroidal graphite cast iron is also referred to as austempered ductile iron (ADI) or bainitic-ferritic spheroidal graphite cast iron.
- ADI austempered ductile iron
- bainitic-ferritic spheroidal graphite cast iron is a low distortion isothermal tempered Cast iron with nodular graphite. It is characterized by a very favorable combination of strength and elongation as well as high resistance to change and favorable wear behavior.
- the basic mass of ADI is a bainite-like structure consisting of needled carbide-free ferrite and carbon-enriched stabilized retained austenite without carbides.
- the graphite In the case of cast iron with vermicular graphite (also known as GJV or GGV), the graphite is neither in the form of a lamella nor in the form of a sphere, but as a particle.
- the mechanical properties of this material lie between the cast iron with lamellar graphite and those of the cast iron with nodular graphite. However, its production is more difficult and requires a close tolerance melt treatment.
- Both the ADI material and the GJV or GJS material are easier to control by casting technology than the steels listed above, but do not have their high mechanical strength. Therefore, these materials are used according to the invention only in the piston lower part, where the mechanical and thermal loads are not so high, such as in the combustion bowl (11) of the upper part (12).
- This composite construction has the advantage that the lower cost of the ADI or GJV or GJS materials compared to the steel can be used.
- Another aspect of the invention relates to a particularly suitable method for the production of a casting by casting a steel piston.
- the inventive method for producing a one-piece and material einheililtlichen steel piston of at least one piston upper part (12) with combustion bowl (11) and annular wall (5) and a piston base (13) with connecting rod bearing (8) provides that a low-pressure casting method is applied.
- the molten steel is controlled by means of a riser controlled from below into the mold cavity of the attached mold, with an overpressure of 0.3 to 5 bar, wherein the sprue of the piston takes place from below over the region of the piston recess (11).
- 1 shows schematically the inflow (2) of the melt from below into the area of the piston recess (11).
- a casting arrangement is selected in which the molten metal is pressed by means of a riser controlled from below, ie against gravity, into the mold cavity of the attached casting mold.
- a mold a mold or sand molds can be used.
- the pressure used in low-pressure casting is usually relatively low and varies between 0.02 and 0.1 MPa, depending on the necessary height of rise and the density of the cast material.
- the casting pressure according to the invention is at an overpressure of about 0.3 to 5 bar.
- a precise control of the casting pressure, and the pressure curve (pressure build-up, holding phase and holding pressure) is required for a uniform and void-free mold filling.
- Preferably 0.5 to 1.5 bar are used.
- the casting furnace and the mold form a Kokillenguss- unit, which are connected by the riser.
- the casting furnace is complete pressure-tight.
- the furnace is used in the preferred only to keep warm and not to melt the metal.
- the molten metal is poured over the pressurization of the holding furnace with controlled casting pressure and controlled casting speed low turbulence from below into the mold.
- an inert gas can also be used. Preference is given to working with nitrogen.
- the resulting piston is fed via the pending casting pressure until the end of its solidification. As a result, a denser structure than in chill casting or gravity casting is achieved.
- a feeder is almost completely dispensed with, since the feed is made through the riser.
- the process is designed in such a way that solidification from above takes place directly above the riser pipe up to a defined point and remains liquid in the riser pipe. This can for example be achieved by the riser is heated or receives a special heat insulation. Furthermore, it is possible alone or in addition to the heated riser to cool the mold at specific locations. This is particularly effective if it is a mold of metal or graphite.
- Another variant provides for the use of sand molds and to take advantage of the increasing mold filling, but to dispense with the feed through the riser. Before the cast piston is completely solidified, the gate of the mold is closed. Then the pressure in the low-pressure casting furnace is lowered and the melt returns from the riser pipe into the furnace. This can shorten the process time.
- the low-pressure casting process also has the advantage that the temperature of the melt can be accurately adjusted. As a result, the casting process, or the exact mold filling is well calculated.
- Another advantage of low pressure casting is that casting defects, such as gas inclusions by turbulent mold filling or cold running due to too slow mold filling, are prevented by a precisely controlled mold filling, in particular precisely controlled filling speed.
- a casting is formed, which is one piece and of uniform material. If the steel piston has further special components, such as, for example, cooling channels, there is the possibility that these are integral with the casting in the finished piston and are of the same material.
- one or more inserts are inserted into the mold to form special components of the piston.
- Inlay parts in contrast to the sand cores that can likewise be used for casting, are parts that remain in the cast piston.
- the inserts are expediently made of steel, since there is good material compatibility with the steel of the piston.
- the inserts particularly preferably at least one cooling channel (4) and / or a connecting rod bearing wall (9) are formed.
- steel tubes (3) or steel shells are inserted into the casting mold.
- the inserts are part of sand core packages.
- the steel pipe can also be a sand-filled pipe. Through the sand filling of the pipe is a even preforming of the pipe possible. When pouring the sand filling prevents accidental breakage of the melt by partial melting of the tube.
- the steel pipe is then filled with foundry sand, if it has an opening (7 ') to the annular wall (5) or large openings (7) to the piston interior.
- the openings (7) for the interior of the piston can be introduced by casting technology and / or by subsequent machining of the casting.
- the opening (7 ') to the annular wall (5) is advantageously formed during casting, since the large opening allows easy and complete removal of core sand contained in the steel pipe.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09014391A EP2184120B1 (en) | 2006-06-30 | 2007-06-12 | Moulded steel piston for combustion engines |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006030699.6A DE102006030699B4 (en) | 2006-06-30 | 2006-06-30 | Cast steel piston for internal combustion engines |
PCT/EP2007/005155 WO2008000347A2 (en) | 2006-06-30 | 2007-06-12 | Cast steel piston for internal combustion engines |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09014391.8 Division-Into | 2009-11-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2035170A2 true EP2035170A2 (en) | 2009-03-18 |
EP2035170B1 EP2035170B1 (en) | 2010-11-17 |
Family
ID=38537790
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07725968A Expired - Fee Related EP2035170B1 (en) | 2006-06-30 | 2007-06-12 | Cast steel piston for internal combustion engines |
EP09014391A Expired - Fee Related EP2184120B1 (en) | 2006-06-30 | 2007-06-12 | Moulded steel piston for combustion engines |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09014391A Expired - Fee Related EP2184120B1 (en) | 2006-06-30 | 2007-06-12 | Moulded steel piston for combustion engines |
Country Status (5)
Country | Link |
---|---|
US (1) | US8528513B2 (en) |
EP (2) | EP2035170B1 (en) |
JP (2) | JP2009541590A (en) |
DE (3) | DE102006030699B4 (en) |
WO (1) | WO2008000347A2 (en) |
Families Citing this family (22)
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FI125458B (en) * | 2008-05-16 | 2015-10-15 | Outokumpu Oy | Stainless steel product, use of product and process for its manufacture |
DE102009048124A1 (en) | 2009-10-02 | 2011-04-07 | Daimler Ag | Steel pistons for internal combustion engines |
USD737861S1 (en) * | 2009-10-30 | 2015-09-01 | Caterpillar Inc. | Engine piston |
DE102010045221B4 (en) | 2010-09-13 | 2017-10-05 | Daimler Ag | Steel pistons for internal combustion engines |
DE102010051681B4 (en) * | 2010-11-17 | 2019-09-12 | Daimler Ag | Method for producing a cooling channel piston |
DE102010052578A1 (en) | 2010-11-25 | 2012-05-31 | Daimler Ag | Piston for an internal combustion engine |
DE102010052579A1 (en) | 2010-11-25 | 2012-05-31 | Daimler Ag | Piston, useful for an internal combustion engine, comprises piston upper part and piston lower part, which are made of different materials |
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KR102068372B1 (en) | 2012-03-12 | 2020-01-20 | 테네코 인코퍼레이티드 | Engine piston |
US9216474B2 (en) | 2012-04-24 | 2015-12-22 | Industrial Parts Depot, Llc | Two-piece friction-welded piston |
DE102012215543A1 (en) * | 2012-08-31 | 2014-03-06 | Mahle International Gmbh | Casting mold of a piston |
DE102014008978A1 (en) * | 2014-06-17 | 2016-01-21 | Daimler Ag | Method for producing a steel piston and steel piston for an internal combustion engine |
DE102014219970A1 (en) * | 2014-10-01 | 2016-04-07 | Volkswagen Aktiengesellschaft | Piston, piston engine with such and motor vehicle with such a piston engine |
US20180230937A1 (en) * | 2015-08-11 | 2018-08-16 | Ks Kolbenschmidt Gmbh | Method for Producing a Monoblock Piston, and Monoblock Piston |
DE102016002791A1 (en) * | 2016-03-07 | 2017-09-07 | Aionacast Consulting Gmbh | A method of manufacturing a housing of an electric motor stator, a housing of an electric motor stator, an electric motor with such a stator housing, and use of a cooling passage made by roll welding |
EP3225702B1 (en) | 2016-03-29 | 2020-03-25 | Deutsche Edelstahlwerke Specialty Steel GmbH & Co. KG | Steel with reduced density and method for producing a steel flat or long product made from such steel |
DE102016215278A1 (en) * | 2016-08-16 | 2018-02-22 | Mahle International Gmbh | Method of machining a piston |
US10662892B2 (en) | 2016-09-09 | 2020-05-26 | Caterpillar Inc. | Piston for internal combustion engine having high temperature-capable crown piece |
CN106392515B (en) * | 2016-11-04 | 2018-07-06 | 广州市镭迪机电制造技术有限公司 | A kind of processing method of sprue bush cooling bath |
JP6242533B1 (en) * | 2017-08-22 | 2017-12-06 | 真辺工業株式会社 | Hollow part and manufacturing method thereof |
US11162454B2 (en) * | 2018-05-31 | 2021-11-02 | Nippon Steel Corporation | Steel piston |
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DE102006030699B4 (en) | 2014-10-02 |
US20090178640A1 (en) | 2009-07-16 |
EP2184120B1 (en) | 2011-01-12 |
WO2008000347A3 (en) | 2008-02-21 |
DE502007006278D1 (en) | 2011-02-24 |
DE102006030699A1 (en) | 2008-01-03 |
JP2013014845A (en) | 2013-01-24 |
JP2009541590A (en) | 2009-11-26 |
US8528513B2 (en) | 2013-09-10 |
WO2008000347A2 (en) | 2008-01-03 |
DE502007005685D1 (en) | 2010-12-30 |
EP2184120A1 (en) | 2010-05-12 |
EP2035170B1 (en) | 2010-11-17 |
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