WO2016102643A1 - Procédé de réalisation d'une rainure - Google Patents

Procédé de réalisation d'une rainure Download PDF

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Publication number
WO2016102643A1
WO2016102643A1 PCT/EP2015/081117 EP2015081117W WO2016102643A1 WO 2016102643 A1 WO2016102643 A1 WO 2016102643A1 EP 2015081117 W EP2015081117 W EP 2015081117W WO 2016102643 A1 WO2016102643 A1 WO 2016102643A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
tooth
geometry
teeth
final
Prior art date
Application number
PCT/EP2015/081117
Other languages
German (de)
English (en)
Inventor
Eugen Maurer
Original Assignee
Jakob Lach Gmbh & Co. Kg
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 Jakob Lach Gmbh & Co. Kg filed Critical Jakob Lach Gmbh & Co. Kg
Priority to EP15823337.9A priority Critical patent/EP3237133A1/fr
Publication of WO2016102643A1 publication Critical patent/WO2016102643A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B41/12—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for forming working surfaces of cylinders, of bearings, e.g. in heads of driving rods, or of other engine parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2215/00—Details of workpieces
    • B23B2215/24—Components of internal combustion engines
    • B23B2215/242—Cylinder liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23B2222/04—Aluminium

Definitions

  • the invention relates to a method for producing a particular helical groove extending in a surface of a workpiece, in particular mecaniclauffiambae a cylinder of an internal combustion engine, by means of a cutting tool having a plurality of teeth with divergent cross-sections, edited over the successive groove cross-sections to a desired final dimensions are, wherein the cross section of the groove in their final groove geometry has a symmetrical trapezoidal geometry with undercut limiting side edges and groove bottom.
  • DE 10 2009 028 040 A1 discloses a combination tool for the structuring of surfaces.
  • the combination tool comprises a cutting structuring tool and a forming tool.
  • undercuts are successively introduced into the surface with two cutting tools.
  • a tool is used according to DE 10 2012 021 089 AI, which in addition to a precut includes a single cutting edge or two cutting, which dictate the final contour.
  • a method and a tool for producing a surface of predetermined roughness are known from WO 2010/015229 AI.
  • a groove structure is machined by means of a follower tool into the surface of the workpiece, such as the inner surface of a cylinder crankcase.
  • the tool has a plurality of teeth of different geometries, by means of which successively the final geometry of the groove is worked out.
  • the teeth may have a geometry such that, in order to form undercuts, these are produced one after the other.
  • material compression which takes place in the same operation as the generation of the groove, the undercuts desired geometry are produced. It is also possible to perform cutting teeth redundantly.
  • a disadvantage of correspondingly generated grooves is that the edges running on the surface side are made relatively thin, so that crack formation in the layer to be applied can occur at these points. Due to the geometry of the edges caused by the edges, there is also the risk that at least parts of the teeth break out.
  • the present invention has for its object to form a method of the type mentioned so that a groove structure in the surface of a workpiece can be produced, which have very fine undercut structures, so that a secure adhesion of the coating is made possible. Furthermore, cracks in the coating to be applied should be avoided in the region of the edges of the grooves.
  • a filigree groove structure is to be made available without the tools used being damaged due to the filigree structure caused by the geometry of the grooves during machining of the workpiece. To solve the problem, the invention essentially provides
  • a base groove is created with boundary surfaces inclined to normal from the surface to form a first symmetric preliminary groove geometry of a depth less than the depth of the groove in its final groove geometry
  • the base groove is processed in extension of the boundary surfaces up to or close to the groove bottom of the groove in its final groove geometry in order to produce a second preliminary groove geometry
  • regions for generating a third preliminary groove geometry are removed, each extending between groove bottom and from a straight line spanned by the groove bottom and the boundary surfaces each intersecting at a point , is determined by the desired length of the chamfer, and
  • the final geometry of the groove is produced successively by means of a follower tool, it being ensured by the formation of the chamfers that the edges of the groove are not pointed, with the result that crack formation in the layer to be applied is avoided.
  • the undercuts may have a desired depth, so that clawing or stapling of a surface-coating material occurs to the extent that the sheet material remains adhered.
  • coatings can be easily applied by thermal spraying, with flame spraying, plasma spraying, arc spraying are exemplary.
  • the inventive method for coating for inner surfaces of cylinder crankcases is determined from cast aluminum, so that due to the groove formation according to the invention and the subsequent thermal spraying an extremely wear-resistant stable tread is provided that withstands high loads.
  • the teaching of the invention requires no additional material compression in order to produce a desired groove geometry, since, as mentioned, the edges are sufficiently solid and thus dimensionally stable.
  • the at least one third tooth and the at least one fourth tooth are spaced apart from one another when machining the workpiece.
  • the invention is characterized by a follower tool having teeth in that only an extension of the cross section of the groove is produced by subsequent cuts without further processing of a cut processed by a tooth by a subsequent tooth.
  • a tool can be used with which a certain number of consecutive teeth successively generates the desired final geometry, so that each tooth is the same and symmetrical is charged.
  • a symmetrical load is a prerequisite for a stable tooth and a stable process.
  • the teeth are arranged such that their distance is equal to twice the pitch of a helical course having groove. This ensures that the teeth to the required extent and with high Precision are made, in particular, it is provided that these are cut out by means of laser from a hard material or PCD plate, which in turn z. B. on a support z. B. is attached from carbide. In this case, the teeth may extend in sections within the carrier.
  • the possibility of forming the teeth redundant wherein preferably at least the fourth tooth, but in particular the third and fourth tooth should be redundant, so that it is ensured that in the formation of the groove this even then the desired final geometry when one of the teeth should be damaged during machining.
  • the groove is cleared.
  • the invention will of course not be abandoned if not a first and a second tooth, but a single tooth is used to generate the boundary surfaces to the actual course of the groove bottom of the groove to be formed, which is possibly redundant.
  • the inventive successive formation of the groove to its final geometry material removal takes place to the extent that damage is avoided and thus a defined and reproducible groove geometry can be achieved with the result that after the coating, a contact surface is available that meets the highest standards.
  • the length of the chamfer in the cross-sectional plane of the groove should be in the range between 0.01 mm and 0.02 mm.
  • the groove bottom can be continuous, z. B. with a radius of 0.01 mm, pass into the side edges.
  • z. B. with a radius of 0.01 mm
  • the invention is characterized by a method for producing a particular helically extending groove in a surface of a workpiece, in particular inner raceway of a cylinder of an internal combustion engine, by means of a cutting tool having a plurality of teeth with divergent cross-sections, on the successive groove cross-sections to a desired End configured be edited, the cross-section of the groove in their final groove geometry has a symmetrical trapezoidal geometry with undercut limiting side edges and groove bottom, which is characterized in that are generated with a first tooth symmetrical to outgoing from the surface normals boundary surfaces of a base groove, of which outer sections are chamfers of the final groove, which remain unchanged during machining with further teeth.
  • the invention also relates to the use of a tool with teeth of previously explained geometries for carrying out a method with which a helical groove is produced in an inner surface of a cylinder of an internal combustion engine. Further details, advantages and features of the invention will become apparent not only from the claims, the features to be taken these features - alone and / or in combination - but also from the following description of a drawing to be taken preferred embodiment.
  • FIG. 2 shows the cutting insert of FIG. 1 in an enlarged view
  • Fig. 4 is a schematic representation of Zahn conciseismeen made with the
  • FIG. 5 is a schematic diagram corresponding to FIG. 4 with a final geometry deviating from FIG. 4 of a groove.
  • a tool is described below with which a cylindrical inner surface is structured in such a way that a coating to be applied adheres to the surface, in particular by means of thermal spraying, by a kind of toothing, wedging, clamping, in order to roughly describe the adhesion.
  • a follower tool is used according to the invention, which viewed in the longitudinal direction of the tool has a plurality of teeth, with which a machining takes place.
  • a clearing out of the fabricated structure or a supporting of the tool on the surface can take place without a material removal takes place.
  • a groove can be produced which, regardless of its filigree to the extent required undercuts, so a coating can be fixed.
  • the filigree results in the advantage that the volume of the groove can be kept relatively small and thus expensive coating material can be saved. Furthermore, crack formation is avoided in the region of their openings.
  • the invention relates to a process for the production of a substrate for coatings which does not have any connections to the substrate, i. H. go to the material, so that a mechanical wedging is required.
  • the groove is always formed symmetrically from the beginning to its final geometry, so that it is ensured that the teeth required for the machining are uniformly loaded.
  • the tool is spirally guided through the bore to achieve in this way a helical course of the groove.
  • the pitch distance may be 0.20 mm to 0.30 mm, in particular 0.25 mm.
  • an indexable insert 10 is used in the embodiment, the z. B. from a hard material such as PCD cutting insert 12 which is connected to a carrier 14.
  • PCD cutting insert 12 which is connected to a carrier 14.
  • the cutting insert 12 has teeth described in more detail below, which are preferably arranged along a straight line, which preferably runs parallel to the axis of rotation of the tool.
  • the equipped with the cutting insert 12 tool can be referred to as a follow-up tool, as successively successive teeth engage in a trainee groove to edit them to a desired final dimension.
  • a feature co-determining the invention is that the subsequent cuts produced by the successive teeth merely expand the groove geometry and that non-preceding cuts are processed or changed with a subsequent cut.
  • the cutting insert 12 in the exemplary embodiment on five different teeth, some of which are redundant, so at least twice available.
  • first of all a first groove 18 (tooth 1) of a base groove of a first preliminary symmetrical groove geometry is produced by machining.
  • the geometry of the base groove is shown in FIG. 4 or FIG. 5, wherein the region 1 with the tooth 1 is removed from the workpiece 62 designated in the exemplary embodiment as a cylinder crankcase.
  • the base groove in this case has boundary surfaces 20, 22 and a base 24 which extends at a distance from the groove bottom 26 in the final geometry 28 of the groove 16, as also by FIGS. 4 and 5 illustrate.
  • the boundary surface 20, 22 with the base 24 form a portion of an isosceles trapezium.
  • the boundary surfaces 20, 22 describe to an outgoing from the workpiece surface 30 normal 32 an angle which is between 30 ° and 60 ° and in the exemplary embodiment is 45 °, as well as Figs. 4 and 5 can be seen.
  • the drawn angle ⁇ in this case runs between the boundary surface 20 and a straight line 32 which is displaced parallel to the normal and intersects the end of a chamfer 34, which is a section of the boundary surface 20.
  • there is a chamfer 36 on the opposite side of the groove wherein the boundary surfaces 20, 22 and thus also the chamfers 34, 36 extend symmetrically to a plane that intersects the central region of the groove bottom 26. In the plane of symmetry, therefore, a groove extending from the central region of the groove bottom 26 extends in the case of groove bottom 26 extending parallel to the workpiece surface 30.
  • the tool and thus the cutting insert 12 is guided spirally through the bore, wherein the pitch distance A between 0.2 mm and 0.3 mm, in particular in the range of 0.25 mm, is located.
  • a second tooth 38 (tooth 2) is present, the side edges 40, 42 have the same course as that of the tooth 18, so that upon penetration into the base groove machining removal of the boundary surfaces 20, 22 is not carried out, but are increased in their length, as Fig. 4 illustrates, so that the area provided with the reference numeral 2 removed and thus the base groove is increased in depth.
  • a cutting away of the previously formed and the bevels 34, 36 having boundary surfaces 20, 22 does not take place. However, this does not rule out that a small amount of material could be removed.
  • a removal takes place until the region 41 of the groove base 26.
  • a third tooth 44 which is additionally marked in Fig. 2 with tooth 3.1.
  • the third tooth 44 is - like the first tooth 18 and the second tooth 38 - formed symmetrically, ie, the cutting edges are symmetrical to a plane which is penetrated perpendicularly from the axis of rotation of the tool.
  • areas 46, 48 are removed which have a triangular geometry in section. These regions 46, 48 extend between normals 50, 52 intersecting the boundary surfaces 20, 22 at a point 46, 48 and the bottom ends of the boundary surfaces 20, 22. The intersection 46, 48 defines the length of the boundary surfaces Bevel 34, 36 predetermined. A machining of the chamfer 34, 36 when removing the areas 46, 48 does not take place.
  • the third tooth 44 is redundant, d. H. At twice the pitch, another third tooth is present, which is marked "tooth 3.2" in Fig. 2.
  • the region 46, 48 is designated "3.1 / 3.2".
  • the geometry of the tooth 3.2 corresponds to that of the tooth 44, that is the "tooth 3.1”.
  • a fourth tooth 54 is present, by means of which the final geometry of the groove 16 is generated.
  • the side edges 56, 58 are generated, through which the undercuts of the groove 16 are formed.
  • the tooth 54 does not touch the chamfers 34, 36, as is also illustrated by FIG. 3.
  • the fourth tooth 54 has a trapezoidal geometry in section, wherein the cutting edges are symmetrical to each other, as in the teeth 18, 38, 44, 45 also applies.
  • the third tooth 44, 45 and the fourth tooth 54 is redundant (reference numeral 55 and tooth 4.2).
  • a fifth tooth 60 adjoins the fourth tooth 55 twice, which is to be referred to as a broaching tooth and an undersize in the order of magnitude of 1 to the fourth tooth 55 / 100 mm should have. This is illustrated in principle in FIG. 4 by the number "5" provided with arrows.
  • FIGS 3 shows that the flanks 56, 58 forming the undercut to the normal 32 or to a straight line parallel thereto, enclose an angle ⁇ which should be in the region of 20 °, as is the case with FIGS 3 indicates.
  • transition between the groove bottom 26 and the side edges 56, 58 is formed by an arc with, for example, a radius of 0.01 mm.
  • the transition between the side flanks 56, 58 and the groove bottom 26 takes place via a bevel, which is formed by a bevel present in the tooth.
  • the bevels are denoted by the reference numerals 70, 72, wherein the bevels 72, 74 via edges 76, 78 and 80, 82 in the side edges 56, 58 and the groove bottom 26 pass.
  • the bevels 72, 74 quasi a discontinuous transition to the side edges 56, 58 and the groove bottom 26.
  • the transition according to the left representation in Fig. 3 is continuous, said a radius of z.
  • FIG. 4 corresponds to the left-hand illustration of FIG 3 with respect to the groove geometry and FIG. 5 of the right-hand illustration in FIG. 3. Therefore, the same reference numerals are used also with the exception of the transition between the side edges 56, 58 and groove bottom 26.
  • the continuous transition between the side edges 56, 58 and the groove bottom 26 is characterized by the region R, which may have a radius of 0.01 mm.
  • the quasi discontinuous transition between the side edges 56, 58 and the groove bottom 26 of FIG. 5 is illustrated by the limited by the edges 76, 78 and 80, 82 slopes 72, 74.
  • the first tooth 18 is preceded by a plateau-like elevation 62, via which the tool, d. H. the cutting insert 12 is supported on the workpiece surface 30, that is to say on the inner surface of the cylinder running surface. Accordingly, there is a plateau-like region 64 behind the fifth tooth 60.
  • the width of the groove 16 between the points 46, 48, that is, the inner ends of the chamfers 34, 36 is in the range of 0.13 mm.
  • the depth of the groove 16 is 0.06 mm.
  • frontal clearance angle should be 5 ° and the lateral clearance angle 3 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Milling Processes (AREA)

Abstract

L'invention concerne un procédé de réalisation d'une rainure dans une surface (30) d'une pièce au moyen d'un outil d'usinage par enlèvement de copeaux qui comporte une pluralité de dents de sections transversales différentes qui permettent de réaliser successivement des sections transversales de rainures à une cote finale désirée. La section transversale de la rainure présente, quant à sa géométrie finale, une géométrie en forme de trapèze symétrique pourvue de flancs latéraux (56, 58) et d'un fond de rainure (26) qui délimitent des contre-dépouilles. Pour réaliser la rainure, on génère avec une première dent des faces de délimitation (20, 22) d'une rainure qui s'étendent symétriquement par rapport à la normale partant de la surface (30) et dont des parties extérieures sont des chanfreins (34, 36) de la rainure finale qui restent inchangés au cours de l'usinage avec les autres dents.
PCT/EP2015/081117 2014-12-23 2015-12-23 Procédé de réalisation d'une rainure WO2016102643A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15823337.9A EP3237133A1 (fr) 2014-12-23 2015-12-23 Procédé de réalisation d'une rainure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014119514.0A DE102014119514A1 (de) 2014-12-23 2014-12-23 Verfahren zum Erzeugen einer Rille
DE102014119514.0 2014-12-23

Publications (1)

Publication Number Publication Date
WO2016102643A1 true WO2016102643A1 (fr) 2016-06-30

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EP (1) EP3237133A1 (fr)
DE (1) DE102014119514A1 (fr)
WO (1) WO2016102643A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108817440A (zh) * 2018-06-29 2018-11-16 广西玉柴机器股份有限公司 一种复合式气缸盖缸孔加工工艺方法
CN114260509A (zh) * 2021-11-25 2022-04-01 东台立一工业技术有限公司 一种滑动轴承生产加工用工件外工面倒角装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016216926B4 (de) * 2016-09-07 2023-10-12 Gühring KG Schneidelement, Werkzeug und Verfahren zum Erzeugen einer wendelförmig verlaufenden, trapezförmig hinterschnittenen Rille in einer zylindrischen Oberfläche einer Bohrung

Citations (9)

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Publication number Priority date Publication date Assignee Title
US7220458B2 (en) 2003-09-19 2007-05-22 Los Alamos National Security, Llc Spray shadowing for stress relief and mechanical locking in thick protective coatings
DE102006045275B3 (de) 2006-09-22 2008-02-07 Technische Universität Braunschweig Verfahren zur Herstellung eines Produktes, Produkt sowie Werkzeug zur Durchführung des Verfahrens
WO2010015229A1 (fr) 2008-08-05 2010-02-11 Honsel Ag Procédé et outil pour produire une surface présentant une rugosité prédéfinie
DE102009028040A1 (de) 2009-07-27 2011-02-10 Walter Ag Kombinationswerkzeug für die Strukturierung von Oberflächen
DE102009027200B3 (de) 2009-06-25 2011-04-07 Ford Global Technologies, LLC, Dearborn Verfahren zum Aufrauhen von Metalloberflächen, Verwendung des Verfahrens und Werkstück
FR2957541A1 (fr) * 2010-03-18 2011-09-23 Peugeot Citroen Automobiles Sa Procede et dispositif d'usinage d'un fut cylindrique et procede de fabrication utilisant ce procede d'usinage
CN202877630U (zh) * 2012-09-26 2013-04-17 沈阳黎明航空发动机(集团)有限责任公司 一种高精度小尺寸榫槽拉削专用刀具
DE102011055516A1 (de) 2011-11-18 2013-05-23 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Profil für ein zylindrisches Bauteil
DE102012021089A1 (de) 2012-10-26 2014-06-12 Daimler Ag Bauteil mit einer aufgerauten Oberfläche

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7220458B2 (en) 2003-09-19 2007-05-22 Los Alamos National Security, Llc Spray shadowing for stress relief and mechanical locking in thick protective coatings
DE102006045275B3 (de) 2006-09-22 2008-02-07 Technische Universität Braunschweig Verfahren zur Herstellung eines Produktes, Produkt sowie Werkzeug zur Durchführung des Verfahrens
WO2010015229A1 (fr) 2008-08-05 2010-02-11 Honsel Ag Procédé et outil pour produire une surface présentant une rugosité prédéfinie
DE102009027200B3 (de) 2009-06-25 2011-04-07 Ford Global Technologies, LLC, Dearborn Verfahren zum Aufrauhen von Metalloberflächen, Verwendung des Verfahrens und Werkstück
DE102009028040A1 (de) 2009-07-27 2011-02-10 Walter Ag Kombinationswerkzeug für die Strukturierung von Oberflächen
FR2957541A1 (fr) * 2010-03-18 2011-09-23 Peugeot Citroen Automobiles Sa Procede et dispositif d'usinage d'un fut cylindrique et procede de fabrication utilisant ce procede d'usinage
DE102011055516A1 (de) 2011-11-18 2013-05-23 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Profil für ein zylindrisches Bauteil
CN202877630U (zh) * 2012-09-26 2013-04-17 沈阳黎明航空发动机(集团)有限责任公司 一种高精度小尺寸榫槽拉削专用刀具
DE102012021089A1 (de) 2012-10-26 2014-06-12 Daimler Ag Bauteil mit einer aufgerauten Oberfläche

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108817440A (zh) * 2018-06-29 2018-11-16 广西玉柴机器股份有限公司 一种复合式气缸盖缸孔加工工艺方法
CN114260509A (zh) * 2021-11-25 2022-04-01 东台立一工业技术有限公司 一种滑动轴承生产加工用工件外工面倒角装置

Also Published As

Publication number Publication date
EP3237133A1 (fr) 2017-11-01
DE102014119514A1 (de) 2016-06-23

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