EP3169757A1 - Procédé anti-grippage pour le traitement de matériaux - Google Patents

Procédé anti-grippage pour le traitement de matériaux

Info

Publication number
EP3169757A1
EP3169757A1 EP14781678.9A EP14781678A EP3169757A1 EP 3169757 A1 EP3169757 A1 EP 3169757A1 EP 14781678 A EP14781678 A EP 14781678A EP 3169757 A1 EP3169757 A1 EP 3169757A1
Authority
EP
European Patent Office
Prior art keywords
component
subjected
galling
washing
shot peening
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
Application number
EP14781678.9A
Other languages
German (de)
English (en)
Other versions
EP3169757B1 (fr
Inventor
Eustachio Calia
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.)
Italtractor ITM SpA
Original Assignee
Italtractor ITM SpA
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 Italtractor ITM SpA filed Critical Italtractor ITM SpA
Publication of EP3169757A1 publication Critical patent/EP3169757A1/fr
Application granted granted Critical
Publication of EP3169757B1 publication Critical patent/EP3169757B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/06—Metal compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
    • C10M2201/0663—Molybdenum sulfide used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/08—Solids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2080/00—Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal

Definitions

  • the present invention relates to an anti-galling method for treating materials.
  • galling can be due to various reasons, which lead to a single consequence: excessive overheating of the propulsion unit.
  • galling can be caused by lack of lubrication, by excessive stress at full power and prolonged over time (caused for example by an operating rate that is higher than the actual capability of the machine) or by incorrect play between the parts (an excessively small play between the bushing and the respective pivot, for example, can cause an interruption of the lubricating film; an excessive play does not allow correct segregation of the lubricant, if any, and can generate impacts between the components).
  • lubricant grey, oil or specific emulsions
  • numerous mechanical couplings in which no lubricant is used are provided.
  • the present invention relates preferably to any pivot- bushing assembly the components of which are made of a metallic material (for example steel, aluminum and alloys of another type) with a reciprocal rotary motion.
  • a metallic material for example steel, aluminum and alloys of another type
  • lubricants are often interposed between the pivot and the bushing (within the play between them) and segregated therein by means of specific sealing elements.
  • the lubricant may not be sufficient to avoid galling, especially after many hours of operation.
  • assemblies of the known type are particularly subject to galling and in order to avoid its onset periodic maintenance is provided which is aimed at checking the state of the lubricant arranged in the play between the pivot and the bushing and at restoring its ideal conditions.
  • assemblies of the known type are subject to galling phenomena and, if one wishes to avoid the occurrence of this phenomenon, which would cause machine downtime, frequent and expensive periodic maintenance of the assemblies is necessary.
  • the aim of the present invention is to solve the problems described above, proposing an anti-gal ling method for treating materials that allows minimizing the onset of galling to the point of making it even negligible.
  • an object of the invention is to propose an anti-galling method for treating materials that makes it possible to minimize the risk of galling of a pivot intended to be turned with respect to a bushing that is mated with it.
  • Another object of the invention is to propose an anti-galling method for treating materials that ensures a reduction of the periodic maintenance of the mechanical couplings that comprise components subjected to said method.
  • Another object of the present invention is to provide an anti-galling method for treating materials that has low costs, is relatively simple to provide in practice and is safe in application.
  • an anti-galling method for treating materials which provides for subjecting at least one of the at least two components mutually coupled with at least one degree of freedom, made of metallic material, to a first preliminary step of thermal treatments to increase surface hardness and to a second preliminary step of surface grinding, which consists in
  • the numeral 1 generally designates a possible rotary mechanical coupling provided by applying the anti-galling method for treating materials according to the invention.
  • the method according to the invention can be applied to mechanical couplings between which there is at least one degree of freedom.
  • Said components are preferably made of metallic material: by way of example, mention is made of metallic alloys, such as steel, or metals substantially in the pure state, such as aluminum. If reference is made to components made of steel, quenched and tempered steel will generally be used.
  • the anti-galling method according to the invention entails subjecting at least one of the at least two components to a first preliminary step of thermal treatments to increase surface hardness and to a second preliminary step of surface grinding.
  • the two preliminary steps are the ones normally applied in the background art.
  • the method according to the invention provides for the execution of additional consecutive steps on the at least one component.
  • the process requires the execution of a third step of application of a layer of molybdenum disulfide on the at least one portion of the at least one component previously subjected to shot peening.
  • the first washing step also comprises a surface degreasing of the at least one portion of the surface of the at least one component previously subjected to the preliminary steps.
  • Degreasing consists in removing any trace of grease or dirt from the surface of the component (generally made of steel) before subjecting it to subsequent treatments (mechanical, thermal, etcetera) or to surface finishing. It is important to remove traces of grease and dirt, because the presence of organic molecules, being constituted essentially by carbon, can be dangerous: the carbon may in fact enter the matrix of the material during a thermal treatment, if performed (some mechanical treatments that generate heat also can cause the migration of the carbon contained in the grease that is present on the external surface of the part being machined), causing an aesthetic damage to the part and most of all a local degradation of its characteristics. Carbon enrichment can affect negatively the mechanical properties of the part by hardening and embrittlement, even reducing its corrosion resistance.
  • Degreasing can be performed with organic solvents by utilizing the chemical principle according to which "like dissolves like” or with alkaline or acid solvents in an aqueous base. In this second case, one acts on the hydrophilic part of the compound.
  • the second step of shot peening the at least one portion of the surface of the at least one component previously subjected to washing is extended to obtain, in said at least one portion, a state of residual compression with a value comprised between 200 MPa and 10000 MPa: the ideal value of residual compression that can be obtained for correct execution of the method according to the invention is approximately 1 100 MPa.
  • Shot peening is an operation that consists in surface cold hammering by means of a violent jet of spherical shot, or of cylindrical shot obtained by cutting a wire (known as cut-wire shot).
  • the machines that perform this treatment i.e., peening machines, propel the jet of rounded or cylindrical shot toward the parts to be machined by means of one or more rapidly rotating impellers, generally centrifugal ones, or by means of compressed air; in any case, the materials used for the grit can be cast iron, steel, glass and, more rarely, ceramics.
  • shot peening improves the distribution of the surface tensions that has been perturbed by mechanical treatments and/or thermal treatments and attenuates the concentrations of efforts produced by notches, threads, decarburization, etcetera.
  • Shot peening as regards the manners of execution, resembles sanding, while for its intended purpose it is more similar to rolling, since it acts more on plasticity than on abrasion.
  • This effect is due to the residual compressive tensions that it causes in the surface of the material and in the underlying layers, which are able to reduce the internal tensions when the part is subjected to stresses.
  • the material is thus rendered more resistant to fatigue stresses.
  • shot peening intensity measured in Almen degrees
  • the curvature undergone, in the direction of incidence of the stream by one of the two faces of a laminar test piece (76 x 19 mm) obtained from C 70 UNI 7845 killed steel hardened and tempered at 44 ⁇ 45 HRC, the thickness "s" of which can assume three different values that correspond to shot peenings of weak intensity N, medium intensity A, and strong intensity C.
  • the curvature, produced by the stream of shot is measured with a quadrant comparator.
  • Coverage is determined by subjecting a polished test piece to a stream of shot for a time that corresponds to the associated intensity and by measuring, with a 50X magnification, the areas of all the impinged regions located within a circumference having a conventionally set diameter; coverage is defined as the ratio between the sum of the areas of the impinged regions and the area of the circle.
  • This second step of shot peening of the at least one portion of the surface of the at least one component subjected previously to washing is performed with S I 10 steel balls with a diameter comprised between 0.01 mm and 1.5 mm: preferably, balls are adopted which have a diameter equal to approximately 0.3 mm, a value for which an optimum result of the treatment in the method according to the invention has been observed.
  • the second step of shot peening of the at least one portion of the surface of the at least one component subjected previously to washing is performed with an intensity between 4 and 40 Almen degrees referred to a type A test piece (i.e., peening of medium intensity identified by the letter A).
  • peening intensity expressed in Almen degrees and referred to peening of medium intensity identified by the letter A, is approximately 6 or 8.
  • said second step of shot peening is performed by providing a coverage of more than 60%, although optimum results are achieved with 100% coverage of said at least one portion.
  • the third step of the method according to the invention which corresponds to the application of a layer of molybdenum disulfide on the at least one portion of the at least one component, entails the provision of a layer with a thickness comprised between 1 and 50 ⁇ .
  • the third step of application of a layer of molybdenum disulfide on the at least one portion of the at least one component provides for the aspersion, on said portion, of an aerosol comprising molybdenum disulfide in a percentage by weight of more than 10%, inorganic resins, solvents and propellants.
  • the molybdenum disulfide percentage is higher than 20% in order to obtain better results and a more efficient and stable layer on the treated portion of the component.
  • the shot peening step generates on the outer surface of the component a plurality of contiguous micro-concavities.
  • This surface irregularity facilitates the adhesion of the molybdenum disulfide, ensuring that deposits of even higher thickness are produced locally which increase its structural strength.
  • the surface affected by a plurality of contiguous concavities without discontinuity has a larger area, thus extending the regions of contact between the molybdenum disulfide and the surface itself: the toughness of the adhesion of the molybdenum disulfide is directly proportional to the area of the surface that is coated and therefore an irregular surface produces a higher stability of the stratification.
  • the residual tension produced by the shot peening step ensures higher rigidity of the surface of the component.
  • a component that is less subject to deformations is certainly more suitable to be subjected subsequently to the deposition of a layer of rigid material, since deformations might cause layer separations.
  • the combination of the steps entails therefore an overlap of the indicated effects and also a synergistic combination thereof which ensures a strength of the layer of molybdenum disulfide and also an effectiveness of the mechanical coupling that is surprising in terms of durability and mechanical performance.
  • the method according to the invention also provides for the optional execution of an additional auxiliary step of removing material in the other of the two mutually coupled components, in order to increase play between them.
  • the removal of material occurs at at least one region of the other component that does not face and is proximate to the at least one portion subjected to the first to third steps.
  • the increase in plays makes it possible to contain a larger quantity of lubricant (oil or grease) within said plays.
  • lubricant oil or grease
  • the lubricant is segregated within the free space (play) that is present between the components by means of respective sealing elements of the traditional type, for which the provision of any specific description is not deemed necessary
  • a first component is constituted by a pivot 2 and a second component is constituted by a bushing
  • the pivot 2 in the configuration for use, is inserted rotatably within the bushing 3 and defines a sliding of its at least one portion 4, subjected to the first to third steps, on corresponding areas of the internal surface of the bushing 3.
  • the bushing 3 is machined with removal of material on a part of its internal surface in order to define a region 5 of the cavity formed by it that has a larger diameter.
  • a predefined quantity of lubricant can be segregated which facilitates the mutual rotations of the pivot 2 and the bushing 3.
  • the accompanying figure in particular, refers to a possible coupling of links of a chain that are mutually articulated.
  • the links 7 and 8 of the chain in this case are keyed on the bushing 3 with a predefined interference.
  • the assembly of the pivot 2 and of the links 9 and 10 constitutes a first joint part and the assembly of the bushing 3 and of the links 7 and 8 constitutes a second joint part.
  • the two joint parts constitute the mechanical coupling, which can be particularly efficient if the portions 4 of the pivot 2 that are intended to slide on the internal surface of the bushing 3 have been subjected to the method according to the invention.
  • sealing elements 1 1 and 12 are used between the pivot 2 and the bushing 3.
  • Chains of the type shown in the accompanying figure are used universally in earth-moving machines and in many other industrial processes.
  • the method according to the invention can be applied in any case to a considerable number of other mechanical couplings and joints which, due to the mechanical tensions applied and/or to the speed and frequency of the mutual movements, are normally subject to galling.
  • the present invention solves the problems described earlier, proposing an anti-galling method for treating materials that allows minimizing the onset of galling to the point of even rendering it negligible.
  • the anti-galling method according to the invention allows minimizing the risk of galling of a pivot 2 intended to be turned with respect to a bushing 3 that is mated therewith, thus being particularly effective in the case of rotary couplings.
  • the anti-galling method according to the invention ensures a reduction in periodic maintenance of the mechanical couplings comprising components subjected to said method.
  • the anti-galling method according to the invention can be performed with substantially low costs, is relatively simple to provide in practice and is safe in application.
  • the materials used, as well as the dimensions, may be any according to the requirements and the state of the art.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Lubricants (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning In General (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

L'invention concerne un procédé anti-grippage, pour le traitement de matériaux, qui consiste à soumettre au moins l'un des deux ou plus de deux composants couplés l'un à l'autre avec au moins un degré de liberté et constitués d'un matériau métallique, à une première étape préliminaire de traitements thermiques pour augmenter la dureté de surface et à une seconde étape préliminaire de surfaçage à la meule, qui consiste à effectuer une première étape de lavage d'au moins une partie de la surface dudit ou desdits composants auparavant soumis aux étapes préliminaires ; à effectuer une deuxième étape de grenaillage d'écrouissage de ladite ou desdites parties de la surface dudit ou desdits composants auparavant soumises au lavage ; à effectuer une troisième étape d'application d'une couche de disulfure de molybdène sur ladite ou lesdites parties dudit ou desdits composants auparavant soumises au grenaillage.
EP14781678.9A 2014-07-14 2014-07-14 Procédé anti-grippage pour le traitement de matériaux Active EP3169757B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2014/000189 WO2016009453A1 (fr) 2014-07-14 2014-07-14 Procédé anti-grippage pour le traitement de matériaux

Publications (2)

Publication Number Publication Date
EP3169757A1 true EP3169757A1 (fr) 2017-05-24
EP3169757B1 EP3169757B1 (fr) 2022-01-05

Family

ID=51663408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14781678.9A Active EP3169757B1 (fr) 2014-07-14 2014-07-14 Procédé anti-grippage pour le traitement de matériaux

Country Status (8)

Country Link
US (1) US20170175213A1 (fr)
EP (1) EP3169757B1 (fr)
JP (1) JP2017528659A (fr)
KR (1) KR102219744B1 (fr)
CN (1) CN106536692B (fr)
AU (1) AU2014401013B2 (fr)
BR (1) BR112017000335A2 (fr)
WO (1) WO2016009453A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900022563A1 (it) * 2019-11-29 2021-05-29 Italtractor Componente di macchina operatrice
US20240200159A1 (en) * 2022-12-14 2024-06-20 Guangxi University Method for compound strengthening treatment of gear surface
CN116604474B (zh) * 2023-06-13 2024-07-26 上海海隆石油管材研究所 一种钻杆接头螺纹表面处理工艺

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0756043B2 (ja) 1988-09-27 1995-06-14 マツダ株式会社 鋼部材の製造方法
JPH03256672A (ja) * 1990-03-05 1991-11-15 Daido Steel Co Ltd 機械構造部品の製造方法およびショットピーニング装置
JPH11106779A (ja) * 1997-10-03 1999-04-20 Taiho Kogyo Co Ltd 固体潤滑被膜組成物及びそれを用いた滑り軸受材料
JP4790135B2 (ja) * 2001-02-28 2011-10-12 日本ピストンリング株式会社 耐摩耗性摺動部材
JP2003222199A (ja) * 2002-01-29 2003-08-08 Sugiyama Chain Seisakusho:Kk スチールチェーン
JP2006037933A (ja) 2003-08-04 2006-02-09 Hitachi Metals Ltd 高Ｃｒ鋼製ピストン
JP2005307903A (ja) 2004-04-23 2005-11-04 Matsushita Electric Ind Co Ltd スクロール圧縮機
JP2008106901A (ja) * 2006-10-27 2008-05-08 Hitachi Metals Techno Ltd チェーン
JP4297939B2 (ja) * 2006-12-27 2009-07-15 株式会社椿本チエイン 無給油チェーン
JP2014020402A (ja) * 2012-07-13 2014-02-03 Nsk Ltd 転動装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016009453A1 *

Also Published As

Publication number Publication date
AU2014401013B2 (en) 2018-12-06
BR112017000335A2 (pt) 2017-11-07
EP3169757B1 (fr) 2022-01-05
CN106536692A (zh) 2017-03-22
CN106536692B (zh) 2020-03-10
WO2016009453A1 (fr) 2016-01-21
KR102219744B1 (ko) 2021-02-24
KR20170068429A (ko) 2017-06-19
AU2014401013A1 (en) 2017-01-12
JP2017528659A (ja) 2017-09-28
US20170175213A1 (en) 2017-06-22

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