EP3027341A1 - Infiltrierbares einlegeteil - Google Patents
Infiltrierbares einlegeteilInfo
- Publication number
- EP3027341A1 EP3027341A1 EP14744340.2A EP14744340A EP3027341A1 EP 3027341 A1 EP3027341 A1 EP 3027341A1 EP 14744340 A EP14744340 A EP 14744340A EP 3027341 A1 EP3027341 A1 EP 3027341A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- particles
- insert
- vol
- powder
- diameter
- 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
-
- 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
- B22D19/0009—Cylinders, pistons
- B22D19/0027—Cylinders, pistons pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- 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
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/008—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/35—Iron
Definitions
- the present invention relates to an infiltratable insert for a cast light metal piston of an internal combustion engine.
- the invention also relates to a method for producing a light metal piston using such an insert.
- Light metal pistons have long been used in internal combustion engines due to their lower weight and lower inertial forces.
- reinforcements in the form of so-called ring carriers are used.
- As a material for such ring carriers are in particular iron alloys into consideration, which generally have a coefficient of expansion, which is as close as possible to the piston material.
- iron and aluminum alloys have very different thermal conductivities, thermal stresses at the interfaces can lead to high stresses, which are greater the more different the coefficients of thermal expansion of the two materials used for the piston on the one hand and the ring carrier on the other.
- a crack between the ring carrier and the piston usually leads to failure of the engine and must therefore be avoided at all costs.
- the bond between the ring carrier and the piston is usually metallurgically achieved by the known Alfinier perspectives in which the ring carrier is so long immersed in an aluminum melt until a diffusion layer has formed. Then this alfin Arthur ring carrier is poured around during the casting of the piston of the melt of the piston alloy, during which the alfene bond is formed during the subsequent solidification. Due to the high ignition pressures of modern diesel engines, almost all pistons used for this purpose in the first annular groove are reinforced with cast-iron ring carriers, mostly austenite.
- a composite Druckgit compiler for the production of aluminum pistons for internal combustion engines is known in which a ring carrier made of metal foam of the materials nickel, copper, iron or alloys thereof with a volume fraction of the piston of 3-50% at a casting pressure of be infiltrated at least 392 bar in the die casting to the composite with the piston alloy.
- a metallurgical bond can be produced by a subsequent multi-stage heat treatment, for example, solution annealing, aging, or the like.
- DE 196 35 326 A1 discloses a method for producing a light alloy composite element, in which initially a porous composite material is held in a cavity of a casting mold. Subsequently, a molten light alloy is poured into the cavity of the mold by applying a gas pressure, whereby the pores of the porous composite forming material are impregnated with the molten light alloy. This forms a composite section formed of a composite material of the light alloy and the composite forming material. From DE 26 39 294 C2 is for different highly porous sintered materials based on chromium-nickel and Cu, Ni, Fe, Ni-Fe foam materials by infiltration under solidification pressures between 2500 and 1000 bar for open porosities of 25-38% for use as Ring carrier described.
- the present invention is concerned with the problem of providing an insert for an improved embodiment, which in particular enables better infiltration.
- the present invention is based on the general idea of choosing a sintered material for an infiltratable insert powder with a completely novel grain composition in the manner of a new grading curve, whereby the open porosity and thus the infiltration of the insert made of this sintered material is significantly improved ,
- This is achieved, for example, in that the grading curve is narrower, that is to say the size distribution of the individual sintered particles is narrower and thus the sintering powder from which the sintered material is produced is more homogeneous than usual.
- the powder used according to the invention contains at least iron or its alloys, preferably also nickel, copper or their alloys, and in this case comprises particles of different particle sizes, with at most 4 percent by volume of the powder consisting of particles having a diameter of less than 75 ⁇ .
- the size distribution of the individual particles is made significantly narrower, the limitation of the grain sizes below the threshold, in particular the previously occurring filling of pores, which are then no longer available for infiltration limited.
- such a narrow restriction of the particle sizes downwards is not provided, as a result of which a significantly increased degree of filling of the pores remaining between larger sintered particles is achieved.
- the powder used for the sintered material of the insert has a proportion of 0-4.0% vol. Particles with a diameter of 0-75 ⁇ on. In one embodiment, at most 10% vol., Preferably at most 2% vol. of the powder on particles with a diameter of 75-1 ⁇ . In a particularly preferred embodiment further comprise at most 6% vol. of the powder particle diameter in the range of 106-150 ⁇ on. Accordingly, in this preferred embodiment at least 88% vol. of the powder particle diameter greater than 150 ⁇ on.
- the powder can be achieved that the remaining between the individual particles in the sintered material and infiltratable by a later light metal during the casting of the light metal piston pores are not completely filled, so that these pores for infiltration with the light metal available stand, whereby a significantly improved bond between the insert, which may be formed in a piston, for example, as a ring carrier, as a bowl edge or as a bolt eye, can be achieved.
- At least 50% vol. the powder particle diameter of 106-212 ⁇ on Due to the high proportion of powder within a relatively narrow particle size range, the formation of a high porosity and thus promoted an easily infiltrated sintered material. In another embodiment accounts for at least 50% Vol. on particles with diameters greater than 212 ⁇ . Due to the high proportion of larger particles, a coarse-pored structure is achieved, which also facilitates infiltration.
- a powder suitable for producing the sintered material according to the invention has a proportion of 0.5 to 6.0% by volume. Particles with a diameter of 106-150 ⁇ on.
- the mentioned lower limit makes it clear that with such a sieving line or particle size distribution ultrafine particles for complete filling of the pores required for the infiltration are not available or only to an insufficient extent.
- the sintered insert produced from the sintered material according to the invention has 50-80% pores, that is to say a 50-80% porosity which can optionally be filled at least in part by the light metal.
- a powder which is relatively homogeneous in terms of particle size not only is the porosity of the sintered material produced higher, but the individual pores are also substantially larger, which further improves flow through with a light metal melt.
- At least individual sintered particles of the sintered material are coated with a binder, for example with a resin, which increases the green state stability and burns during sintering.
- a resin which increases the green state stability and burns during sintering.
- the resin firmly holds the individual sintered particles together and thus improves the strength of the pressed green compact.
- the binder or the resin represents a porosity of the insert reducing coating of individual sintered particles, which during the subsequent casting of the light metal piston infiltration and thus deteriorates the connection between the light metal of the piston and the insert.
- the binder burns the resin and thus the previously reduced porosity of this again so that it can be used for the infiltration process.
- the binder may also be configured to degrade during sintering by a different chemical reaction than oxidation.
- the insert is fed during sintering instead of air another suitable gas, such as an endo gas.
- a density of the insert is about 2.5-4.7 g / cm 3 .
- the density of aluminum is, for example, about 2.7 g / cm 3 , so that with an infiltration of the insert with light metal, such as aluminum, always a density of less than 5g / cm 3 can be achieved. Due to its high porosity and its comparatively low density, the insert thus increases the weight of the light metal piston by a much smaller amount than a solid cast part made of an iron alloy.
- the invention also relates to a method for producing a light metal piston, for example a magnesium or aluminum piston, using an insert described above, in which the liquid light metal is poured under a casting pressure of about 0.5-15 bar in a mold and in infiltrated the insert arranged in the mold.
- hypoeutectic alloys of aluminum are used with silicon and / or copper. This avoids the formation of Si or Cu phases, which can arise in particular in a hypereutectic Al alloy. This is undesirable because, when infiltrated, the sintered material may act like a filter whose pores do not allow these phases to pass, so that they accumulate on its surface.
- the layer formed thereby separates the insert from the cast piston body and forms a Weak point, which can lead to rejects or later failure of the piston.
- the casting of the light metal piston can be done with or without back pressure, the casting pressure should be greater by at least 0.1 bar than the back pressure.
- the casting of the light metal piston is carried out under protective gas, in particular using nitrogen or argon.
- protective gas in particular using nitrogen or argon.
- the cast piston is solution annealed or overaged.
- so-called precipitation hardening can take place by solution heat treatment, as a result of which the strength of the light metal piston can be increased.
- the curing can be done in principle in three stages, namely the actual solution annealing, quenching and subsequent aging (hot or cold).
- the solution heat treatment is carried out at temperatures of about 480 ° to about 50 ° C, wherein a temperature is selected at which a sufficient amount of the alloying elements is dissolved in the solid solution, so that the hardening effect occurs after quenching and aging.
- the overaging of such an aluminum alloy can also take place.
- the casting molds are usually vented during the casting of the aluminum piston in order to achieve complete filling of the casting mold and an optimized infiltration process of the insert.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013215020.2A DE102013215020A1 (de) | 2013-07-31 | 2013-07-31 | Infiltrierbares Einlegeteil |
PCT/EP2014/066168 WO2015014787A1 (de) | 2013-07-31 | 2014-07-28 | Infiltrierbares einlegeteil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3027341A1 true EP3027341A1 (de) | 2016-06-08 |
EP3027341B1 EP3027341B1 (de) | 2019-09-04 |
Family
ID=51228446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14744340.2A Active EP3027341B1 (de) | 2013-07-31 | 2014-07-28 | Verfahren zur herstellung eines leichtmetallkolbens unter verwendung eines einlegeteils |
Country Status (7)
Country | Link |
---|---|
US (1) | US10207319B2 (de) |
EP (1) | EP3027341B1 (de) |
JP (1) | JP6461954B2 (de) |
CN (1) | CN105451910B (de) |
BR (1) | BR112016001689B1 (de) |
DE (1) | DE102013215020A1 (de) |
WO (1) | WO2015014787A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015216321A1 (de) * | 2015-08-26 | 2017-03-02 | Mahle International Gmbh | Verfahren zur Herstellung eines Kolbens |
DE102015224588A1 (de) | 2015-12-08 | 2017-06-08 | Mahle International Gmbh | Verfahren zum Herstellen eines porösen Formkörpers |
IT201600126019A1 (it) * | 2016-12-14 | 2018-06-14 | Asso Werke S R L | Pistone con anello alfin cofuso e processo per ottenerlo |
DE102018219691A1 (de) * | 2018-11-16 | 2020-05-20 | Mahle International Gmbh | Verfahren zum Herstellen eines Sintermaterials auf pulvermetallurgischem Wege |
CN111842852A (zh) * | 2020-07-30 | 2020-10-30 | 兰州理工大学 | 液模锻浸渗制备耐磨耐蚀高强度铜及铜合金结构件的方法 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2753859A (en) * | 1952-03-07 | 1956-07-10 | Thompson Prod Inc | Valve seat insert |
US3196501A (en) * | 1961-01-26 | 1965-07-27 | Balgarska Akademia Na Naukite | Apparatus and method for metal casting |
DE2639294C2 (de) * | 1976-09-01 | 1982-05-13 | Mahle Gmbh, 7000 Stuttgart | Gepreßter Aluminiumkolben für Verbrennungsmotoren mit Einlagen aus einem anderen Werkstoff |
DE3418405A1 (de) * | 1983-05-18 | 1984-11-29 | Mazda Motor Corp., Hiroshima | Verfahren zur herstellung von gussteilen aus aluminiumlegierung und aus einer aluminiumlegierung bestehender kolben |
JPS59218341A (ja) * | 1983-05-25 | 1984-12-08 | Mazda Motor Corp | アルミニウム合金製ピストン |
JPH02254132A (ja) * | 1989-03-27 | 1990-10-12 | Daihatsu Motor Co Ltd | アルミ等の加圧鋳造用金属製部品を強化するために使用する鉄多孔体の製造方法 |
JP3212245B2 (ja) | 1995-08-30 | 2001-09-25 | マツダ株式会社 | 鋳造方法及び鋳造装置並びに鋳造品 |
JPH09256903A (ja) * | 1996-03-26 | 1997-09-30 | Unisia Jecs Corp | 内燃機関のピストン及びその製造方法 |
DE19712624C2 (de) * | 1997-03-26 | 1999-11-04 | Vaw Motor Gmbh | Aluminiummatrix-Verbundwerkstoff und Verfahren zu seiner Herstellung |
JP2001276961A (ja) * | 2000-03-30 | 2001-10-09 | Mazda Motor Corp | 金属多孔予備成形体及び該成形体を用いた金属複合部材の製造方法 |
US6719948B2 (en) * | 2000-05-22 | 2004-04-13 | Massachusetts Institute Of Technology | Techniques for infiltration of a powder metal skeleton by a similar alloy with melting point depressed |
FR2863186B1 (fr) | 2003-12-04 | 2006-12-15 | Toyota Jidoshokki Kk | Element coule composite, substance poreuse a base de fer pour elements coules composites et carter sous pression procedes de fabrication de ce carter sous pression element constitutif de compresseurs |
US20080060723A1 (en) * | 2006-09-11 | 2008-03-13 | Gm Global Technology Operations, Inc. | Aluminum alloy for engine components |
JP5337142B2 (ja) * | 2010-12-28 | 2013-11-06 | 日立オートモティブシステムズ株式会社 | 内燃機関のピストンと該ピストンの製造法及び摺動部材 |
AT511300B1 (de) | 2011-02-09 | 2019-03-15 | Fill Gmbh | Giessverfahren sowie giessanlage zur herstellung von werkstücken |
DE102011013067A1 (de) * | 2011-03-04 | 2012-09-06 | Mahle International Gmbh | Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor |
-
2013
- 2013-07-31 DE DE102013215020.2A patent/DE102013215020A1/de not_active Withdrawn
-
2014
- 2014-07-28 BR BR112016001689-0A patent/BR112016001689B1/pt not_active IP Right Cessation
- 2014-07-28 EP EP14744340.2A patent/EP3027341B1/de active Active
- 2014-07-28 CN CN201480042299.5A patent/CN105451910B/zh not_active Expired - Fee Related
- 2014-07-28 JP JP2016530473A patent/JP6461954B2/ja not_active Expired - Fee Related
- 2014-07-28 WO PCT/EP2014/066168 patent/WO2015014787A1/de active Application Filing
- 2014-07-28 US US14/909,017 patent/US10207319B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2015014787A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102013215020A1 (de) | 2015-02-05 |
BR112016001689A2 (pt) | 2017-08-01 |
US10207319B2 (en) | 2019-02-19 |
CN105451910B (zh) | 2019-04-26 |
JP2016535195A (ja) | 2016-11-10 |
JP6461954B2 (ja) | 2019-01-30 |
WO2015014787A1 (de) | 2015-02-05 |
BR112016001689B1 (pt) | 2020-10-20 |
US20160175927A1 (en) | 2016-06-23 |
EP3027341B1 (de) | 2019-09-04 |
CN105451910A (zh) | 2016-03-30 |
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