EP1901873A1 - Procede d'usinage de vilebrequins par enlevement de copeaux et dispositif permettant la mise en oeuvre dudit procede - Google Patents

Procede d'usinage de vilebrequins par enlevement de copeaux et dispositif permettant la mise en oeuvre dudit procede

Info

Publication number
EP1901873A1
EP1901873A1 EP06761774A EP06761774A EP1901873A1 EP 1901873 A1 EP1901873 A1 EP 1901873A1 EP 06761774 A EP06761774 A EP 06761774A EP 06761774 A EP06761774 A EP 06761774A EP 1901873 A1 EP1901873 A1 EP 1901873A1
Authority
EP
European Patent Office
Prior art keywords
cutting
angle
machining
laterally
inserts
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.)
Withdrawn
Application number
EP06761774A
Other languages
German (de)
English (en)
Inventor
Markus Heinloth
Jürgen ZASTROZYNSKI
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.)
Kennametal Widia Produktions GmbH and Co KG
Original Assignee
Kennametal Widia Produktions GmbH and 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 Kennametal Widia Produktions GmbH and Co KG filed Critical Kennametal Widia Produktions GmbH and Co KG
Publication of EP1901873A1 publication Critical patent/EP1901873A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/06—Milling crankshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • B23C5/24—Securing arrangements for bits or teeth or cutting inserts adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/36—Other features of the milling insert not covered by B23C2200/04 - B23C2200/32
    • B23C2200/367—Mounted tangentially, i.e. where the rake face is not the face with largest area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0407—Cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2260/00—Details of constructional elements
    • B23C2260/04—Adjustable elements
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y10T409/303808—Process including infeeding
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30784—Milling including means to adustably position cutter

Definitions

  • the invention relates to a method for cutting machining of crankshafts, in which the machining of the bearing width and the oil collar are to be made successively or simultaneously, including a disc-shaped external milling cutter is used with a plurality of cutting tools, of which a part for machining a bearing base of the crankshaft and the other Part for processing an adjacent the storage base oil bundle is used.
  • the invention further relates to a device for carrying out the method with a disc-shaped external milling cutter, on the periphery of which tangentially and laterally clamped cutting inserts are arranged.
  • crankshaft machining The machining of crankshafts is difficult because the crankshaft, due to its length is an unstable workpiece, that has eccentric rotationally symmetric surfaces which have to be machined as the lateral surfaces of the crank bearings and cheek surfaces, including the oil collar.
  • crankshaft machining several methods have been proposed in the prior art, such as turning, internal milling, turning, turning or external milling, of which external milling is often used.
  • EP 0 830 228 B1 proposes, for example, a milling method in which the machining is performed with an external milling cutter at cutting speeds of more than 160 m / min, with chip thicknesses in the range of 0 , 1 mm to 0.3 mm, and with a small cutting arc length of the cutting insert bearing external cutter. Tangentially clamped positive cutting inserts are used to machine the stroke bearings. This so-called high-speed milling of crankshafts has considerable cost advantages, since the machining time of the crankshafts could be considerably minimized.
  • the stroke-bearing jacket surfaces (bearing width) and the oil collar are machined by successive cutting tools, it being possible to implement only one chip thickness by the feed, depending on the oversize of the crankshaft.
  • the corner radius to be produced is smaller than the ⁇ lbundaufrich, which means that in certain cutting areas a higher maximum chip thickness is cut, resulting in a correspondingly high wear of the affected cutting inserts.
  • An overload of cutting (cutting edges) of individual cutting inserts makes this cutting insert unusable, so that regardless of the state of wear of cutting other cutting inserts a tool replacement is necessary, which significantly affects the cycle times and thus the processing costs per crankshaft.
  • an angle of attack K for the cutting tools for machining the oil collar is selected as a function of the current allowance of the crankshaft, in which the effective chip thickness h max is limited to a predefinable maximum value for each cutting insert.
  • the laterally clamped cutting inserts are arranged adjustable with respect to the angle of attack, z. B. in so-called tool cassettes.
  • the number of cutting tools for the oil increased bundling, preferably doubled, which leads to a halving of the effective maximum chip thickness as a result.
  • the advantages of this method and the device consist in an increase in the so-called stall quantity and a cost reduction in terms of minimizing the cost per piece manufactured.
  • the milling process can be set safely regardless of the measurement situation, in particular, the effective chip thicknesses, which are removed by the individual tools, align each other, so that the active cutting tools on the carrier, ie the disc-shaped outer cutter are evenly loaded.
  • the entire machining process is optimized with respect to the specifications given by the crankshaft to be machined.
  • the lateral cutting inserts serving for the formation of the oil jacket can be set or adjusted in the tool carrier at an angle of attack as a function of the actual allowance of the crankshaft in such a way that a predetermined value hmaxe ff is achieved during each cutting operation.
  • the effective chip width can be minimized in a corresponding manner. In the areas in which the laterally clamped cutting insert already achieves a low effective dimension h max due to the angle of attack, no additional cutting edges are required.
  • the tool costs consist of several components. These include, in particular, the tool costs, which are determined not only by the pure production costs but also by the service lives. Furthermore, the processing times and the costs for tool conversion are included. So-called indexable inserts have several usable cutting edges, but their number is structurally limited. Thus, the number of usable cutting edges at ' a cutting insert mentioned above is limited to four.
  • a laterally clampable cutting insert in which at least one pair of the cutting edges is step-shaped and the two having convex and an intermediate concave portion, wherein the outer convex portion extends over an angular extent of 180 °.
  • Such a cutting edge shape can be stepped contours such as an oil collar of a crankshaft cut, at the same time a cheek, the oil collar and the journal bearing corner or a undercut can be formed.
  • two pairs of the cutting edges are preferably formed in steps, so that the cutting insert is rotationally symmetrical about 180 ° about a transverse axis or mirror-symmetrical to a cross-sectional area. Overall, this results in four congruent cutting edges, which can be used successively.
  • a chamfer is provided along the cutting edge, which is preferably arranged at a (negative) chamfer angle of -15 ° and / or with a chamfer width of 0.1 to 0.2 mm.
  • the rake angle used in particular the rake angle adjoining the chamfer, is 0 ° to 20 °, preferably it is selected to be positive at 10 °.
  • the radius of curvature of the cutting edge can be chosen so that this cutting edge in an operation a step-shaped contour is cut in the desired final dimensions.
  • this is the radius of curvature in the concave portion of the cutting edge with 1.5 + 0.1 mm and in the convex portion of the cutting edge on one side with 1, 5 ⁇ 0.1 mm and on the other side with 1, 4 ⁇ 0.1 mm selected.
  • other cutting edge radii of curvature can be used.
  • a cutting insert configuration may be selected in which the common tangent to the convex portions forms an angle of 35 ° ⁇ 5 ° with the base.
  • the cutting edge region reaching over 180 ° passes over a linear cutting edge piece into the adjacent base surface, this cutting edge piece forming an angle of ⁇ 5 ° with the base surface.
  • the convex and the concave cutting edge portion inclined by an angle of up to 20 °, preferably of 10 ° to the longitudinal central axis of the cutting insert.
  • FIG. 1 is a schematic diagram of a partial cross-sectional view of a crankshaft with two processing tools
  • Fig. 2 is a cross-sectional view of a crankshaft section with the
  • Fig. 3 shows the dependence of the allowance or the chip thickness as a function of the angle of attack
  • FIG. 4 shows a further illustration of the optimized production profile according to the present invention.
  • 5 is a plan view of a laterally disposed cutting insert
  • FIG. 6 is a side view (with a plan view of the cutting edge contours) of the cutting insert according to FIG. 5, FIG.
  • Fig. 9 is a side view of another cutting insert.
  • disk-shaped external cutters which have tangentially and radially clamped cutting tools on their periphery, which can be used in each case for producing the Hublagermantel Structure, the so-called oil collar including the adjacent cheek or a undercut.
  • Fig. 1 shows a partial cross-sectional view of a crankshaft with three cutting inserts, of which the cutting inserts 9 and 10 with its active main cutting edge 11 the Contour of the corner radius 12 and the lateral surface 13 determined. Further, Fig. 1 shows a cutting insert 14, which is used for the manufacture of the cheek surface 15 and the corner radius 16 of the oil collar.
  • the cutting inserts 9, 10 and 14 are arranged in addition to further correspondingly formed cutting plates on an external milling cutter, which is arranged both axially in the direction of the double arrow 17 and radially in the direction of the double arrow 18 movable.
  • FIG. 2 shows three overlapping curves, namely a first curve with the corner radius 12, a second curve 19 with the corner radius R, which corresponds to the oil collar to be produced and a third curve 20, which represents a cross section through the crankshaft to be machined with allowance ,
  • a full formation of the maximum chip thickness for manufacturing is automatically required for certain cutting areas.
  • different points h ma ⁇ i, h ma ⁇ 2 and h maX 3 are shown, each of which is rms values.
  • a different ablation dimension H results in each case.
  • the object of the present invention is to adjust the angle of incidence of the cutting inserts with a known allowance so that the effective chip thickness is uniformed, ie that peaks in certain cutting areas are avoided.
  • h max different effective thicknesses
  • the predetermined chip thickness it is provided according to a preferred embodiment of the method according to the invention, that the number of cutting, ie the number of cutting inserts is doubled, so that at constant feed the chip thickness is halved. In the areas that are designated in Fig. 2 and 4 h max 3 or h ⁇ ma 3a, due to the low stock removal required a minimum number of cutting edges is sufficient.
  • the drawn in Fig. 2 radius R of the curve 19 which determines which value h max at one certain point is present, since this radius and the allowance is known before the beginning of the machining, can be achieved by much directed adjustment of the angle K, a substantially uniform chip thickness, which varies by a maximum of 30% by a predetermined value.
  • a cutting insert 10 which has been pre-pressed and sintered, but has not been reworked.
  • the plate 14 used for cutting the contour 19 leads the plate 10 both axially and radially ahead, so that this cutting insert should be contoured precisely contoured.
  • a cutting insert is shown, which replaces the laterally clamped cutting inserts 10 and 14, because he can cut the entire contour of the cheek and the oil collar to the corner radius 12 in a radial feed movement due to its stepped cutting edges. After turning the cutting insert by 180 ° and undercuts can be made.
  • the cutting insert shown in Figures 5 to 8 has two mutually parallel planar base surfaces 110, 111, which are penetrated by a through hole 112. This bore serves to receive a clamping screw, by means of which the cutting insert is attached radially or laterally to a side milling cutter.
  • the base surfaces 110, 111 go over their shorter edges in rounded end faces, each of which is bounded laterally by cutting edges.
  • the cutting edges are stepped and consist of two convex Cutting edge portions 113 and 114 and an intermediate concave cutting edge portion 15.
  • the radii Ri and R 3 for the convex cutting edge sections can be the same size, z. B. 1.5 mm or different. The same applies to the radius R 2 of the concave cutting edge section.
  • the cutting insert has a chamfer 116 extending along the cutting edge portions 113-115. This chamfer is inclined at a chamfer angle a of -15 °.
  • the rake angle b also resulting from FIG. 8 is + 10 °.
  • the chamfer width is for example 0.15 mm.
  • planar side surfaces 117, 118 are provided in the central region.
  • the common tangent 119 of the convex cutting edge portions 113 and 114 with the base 110 and 111 forms an angle of about 35 °. From Fig. 7 it can be seen also a tangent 20 which is placed on the outgoing portion of the cutting edge portion 113 at the transition to the respective base. This tangent 120 forms with the base an angle which is about 4 °.
  • the cutting edges 113 to 115 are inclined relative to the longitudinal center axis 121 of the cutting insert by an angle of inclination c, which is preferably up to 10 °.
  • the cutting insert has a total of four actively usable cutting edges, with which in particular stepped oil bundle contours can be processed, either the expiring sections 122 or 123 depending on Einsticiannnraum the cutting insert for the production of the cheek contour.
  • the cutting insert illustrated in FIG. 9 essentially differs from the cutting insert according to FIGS. 5 to 8 in that it is not rotationally symmetrical to an axis but to the cross-sectional plane 200. This results in a Furthermore, the convex radii R 3 'and Ri' with about 2.3 mm at a concave radius R 2 'below 0.5 mm another differently selected according to another Zerspanungs joint.
  • the prescribed cutting insert may have on the chip surface chip forming and clamping elements in the form of subsidence or elevations.
  • the cutting insert consists of a hard metal or a cermet material, which may optionally also be coated. Typical coating materials are carbides, nitrides, oxides of IVa to Via metals and alumina, but also diamond coatings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

L'invention concerne un procédé d'usinage de vilebrequins par enlèvement de copeaux, l'usinage de la largeur de palier et du collet de vilebrequin devant être exécuté simultanément et une fraise extérieure en forme de disque à plusieurs outils coupants (10, 14) étant utilisée à cet effet, une partie desdits outils servant à usiner une base de palier du vilebrequin et l'autre partie servant à usiner un collet de vilebrequin adjacent à la base de palier. Selon la présente invention, un angle d'attaque (λ) pour les outils coupants destinés à usiner le collet de vilebrequin est sélectionné en fonction de la surépaisseur effective, la profondeur de coupe effective hmax pour chaque plaquette de coupe étant limitée à une valeur maximale prescrite. Cette invention concerne également un dispositif permettant la mise en oeuvre dudit procédé.
EP06761774A 2005-07-11 2006-07-07 Procede d'usinage de vilebrequins par enlevement de copeaux et dispositif permettant la mise en oeuvre dudit procede Withdrawn EP1901873A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005032552 2005-07-11
DE102005038021.2A DE102005038021B4 (de) 2005-07-11 2005-08-09 Verfahren zur zerspanenden Bearbeitung von Kurbelwellen und Vorrichtung zur Durchführung dieses Verfahrens
PCT/DE2006/001172 WO2007006275A1 (fr) 2005-07-11 2006-07-07 Procede d'usinage de vilebrequins par enlevement de copeaux et dispositif permettant la mise en oeuvre dudit procede

Publications (1)

Publication Number Publication Date
EP1901873A1 true EP1901873A1 (fr) 2008-03-26

Family

ID=37199166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06761774A Withdrawn EP1901873A1 (fr) 2005-07-11 2006-07-07 Procede d'usinage de vilebrequins par enlevement de copeaux et dispositif permettant la mise en oeuvre dudit procede

Country Status (11)

Country Link
US (1) US8366359B2 (fr)
EP (1) EP1901873A1 (fr)
JP (1) JP5663136B2 (fr)
KR (1) KR20080025204A (fr)
CN (1) CN101218056B (fr)
BR (1) BRPI0613128A2 (fr)
CA (1) CA2614514A1 (fr)
DE (1) DE102005038021B4 (fr)
MX (1) MX2008000475A (fr)
RU (1) RU2412024C2 (fr)
WO (1) WO2007006275A1 (fr)

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JP5297103B2 (ja) * 2007-08-23 2013-09-25 コマツＮｔｃ株式会社 クランクシャフトミラーのミーリングカッタ
US8141464B2 (en) 2007-08-23 2012-03-27 Komatsu Ntc Ltd. Milling cutter of crank shaft miller, and cutter tip and cutter tip set for milling cutter of crank shaft miller
RU2446920C2 (ru) * 2010-05-31 2012-04-10 Частное научно-производственное предприятие "Промтехнус" (ЧНПП "Промтехнус") Способ финишной обработки поверхностей вращения деталей
CN102078985B (zh) * 2010-12-24 2012-10-24 沈阳飞机工业（集团）有限公司 数控加工转角处理方法
CN102319920B (zh) * 2011-06-10 2013-06-19 江西昌河航空工业有限公司 非完整圆柱面或非规则圆柱回转曲面的偏心铣削加工方法
US9901995B2 (en) * 2013-11-08 2018-02-27 Mitsubishi Hitachi Tool Engineering, Ltd. Radius end mill and cutting work method
DE102014106516B4 (de) * 2014-05-09 2016-03-03 Kennametal Inc. Werkzeug zum Dreh-Drehräumen von Werkstücken
USD778330S1 (en) 2015-07-16 2017-02-07 Kennametal Inc. Double-sided tangential cutting insert
USD777230S1 (en) 2015-07-16 2017-01-24 Kennametal Inc Double-sided tangential cutting insert
US9981323B2 (en) 2015-07-16 2018-05-29 Kennametal Inc. Double-sided tangential cutting insert and cutting tool system using the same
RU2658567C1 (ru) * 2017-03-03 2018-06-21 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В. Ломоносова" (МГУ) Твердосплавная микрофреза с алмазным износостойким покрытием
CN108380949B (zh) * 2018-01-29 2021-02-09 上汽通用五菱汽车股份有限公司 一种曲轴铣削工艺
CN113102812B (zh) * 2021-04-15 2022-12-13 西安法士特汽车传动有限公司 一种套料加工的铣镗倒复合刀具

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Also Published As

Publication number Publication date
RU2412024C2 (ru) 2011-02-20
CN101218056A (zh) 2008-07-09
DE102005038021B4 (de) 2016-07-21
US8366359B2 (en) 2013-02-05
KR20080025204A (ko) 2008-03-19
JP5663136B2 (ja) 2015-02-04
DE102005038021A1 (de) 2007-01-25
MX2008000475A (es) 2008-03-07
CN101218056B (zh) 2012-04-04
US20090232612A1 (en) 2009-09-17
WO2007006275A1 (fr) 2007-01-18
CA2614514A1 (fr) 2007-01-18
RU2008100101A (ru) 2009-08-20
JP2009500184A (ja) 2009-01-08
BRPI0613128A2 (pt) 2010-12-21

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