EP2143529B1 - Procédé de meulage pour la production simultanée de deux surfaces fonctionnelles sur une pièce - Google Patents

Procédé de meulage pour la production simultanée de deux surfaces fonctionnelles sur une pièce Download PDF

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Publication number
EP2143529B1
EP2143529B1 EP20090161059 EP09161059A EP2143529B1 EP 2143529 B1 EP2143529 B1 EP 2143529B1 EP 20090161059 EP20090161059 EP 20090161059 EP 09161059 A EP09161059 A EP 09161059A EP 2143529 B1 EP2143529 B1 EP 2143529B1
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EP
European Patent Office
Prior art keywords
tool
workpiece
functional surface
rotation axis
grinding method
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.)
Not-in-force
Application number
EP20090161059
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German (de)
English (en)
Other versions
EP2143529A2 (fr
EP2143529A3 (fr
Inventor
Gero Johlen
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2143529A2 publication Critical patent/EP2143529A2/fr
Publication of EP2143529A3 publication Critical patent/EP2143529A3/fr
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Publication of EP2143529B1 publication Critical patent/EP2143529B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/18—Wheels of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
    • B24B15/04—Machines or devices designed for grinding seat surfaces; Accessories therefor on valve members

Definitions

  • the present invention relates to a grinding method for simultaneously producing two functional surfaces on a workpiece.
  • a typical application is an outer cone (seat), which merges into an end face, which also - for example, as a high-pressure sealing surface - must be convex or concave spherical.
  • the transition between cone and end face can be designed as a sealing edge.
  • the method according to the invention has the advantage that, for example, sealing surfaces having a preferred shape can be produced in conjunction with a sharp-edged, burr-free sealing edge. Thanks to this burr-free and sharp-edged sealing edge, a high component quality and functionality is guaranteed. At the same time, a low-cost and simple machine technology with a small installation space and optimized cycle time can be used.
  • the inventive simultaneous machining of two functional surfaces results in a high process reliability for the dimensional accuracy of the sealing edge diameter. Due to the fixed geometric setting of the tool, the dimensional stability is hardly influenced by the process. This results in a high process reliability for convex or concave preferred shapes. Consequently, therefore, a simple correction strategy for the process reliability or dimensional stability is given.
  • the tool comprises a main body with an annular tool end face, wherein the tool end face has a circular processing edge or cutting edge in order to produce the first functional surface.
  • the tool used comprises a conical projection which is arranged on the tool end face in order to produce the second functional surface, in particular bevel on the workpiece.
  • the geometry of the tool according to the invention can also be described by defining the base of the conical projection smaller than the tool end face.
  • the lateral surface of the conical projection has the largest circumference on a side facing the base body.
  • the process according to the invention serves e.g. for producing a component having a front surface with a concave or convex preferential shape (for example with a sealing function) in conjunction with burr-free and sharp-edged sealing edge at the transition to another functional surface by grinding with only one tool in one processing step.
  • this concept also reduces the number of machine components, in particular machine axes and grinding spindles. Since the grinding spindle according to the invention is pivoted only a small amount to the workpiece spindle, only little space is required.
  • the tool according to the invention can also be used in conventional grinding machines.
  • the tool end face is incident to a tool rotation axis by a clearance angle ⁇ and is thus funnel-shaped.
  • This clearance angle or this funnel-shaped collapse is particularly important if, in addition to the second functional surface, a convex first functional surface is machined.
  • the tool end face can not only have flat but also a concave or convex surface.
  • a convex first functional surface can be generated with an inner processing edge of the annular tool face.
  • a circular rounded machining edge To influence the roughness of the first functional surface, a radius of the machining edge on the tool according to the invention can be changed. The larger the radius is chosen, the larger the engagement width of the tool and the smaller the roughness on the workpiece. This rounding also improves the edge stability of the tool according to the invention. It is also advantageous to optimally adjust the roughness of the first and the second functional surfaces by the choice of grinding parameters and / or wheel specification of the tool and / or by the workpiece speed and / or the tool speed.
  • the editing edge does not necessarily have to be defined. So it is also advantageous to edit the first functional area with an undefined processing edge.
  • the conical extension is also advantageous to form the conical extension as a truncated cone.
  • the upper end of the conical extension is not needed for machining the second functional surface and thus it is sufficient to provide a frusto-conical extension.
  • a lateral surface of the conical projection is flat or concave or convex.
  • the invention describes a grinding method according to claim 1.
  • the simultaneous processing according to the invention of both surfaces in one clamping with only one tool the number of processing stations is reduced, moreover, can be with the inventive method due to the simple structure - compact grinding spindle with low tilt angle compared to Workpiece spindle - use a simple, conventional machine concept and leave room for additional processing stations. If, as in the prior art, grinding is performed with two tools, there is also the risk that the sealing edge diameter deviates if one of the tools deviates from the nominal dimension. When machining with only one tool, even with an axial offset of the workpiece or tool, there is no negative influence on the sealing edge diameter. Highly accurate sealing surfaces and sealing edges with very high functionality can be manufactured reliably and inexpensively.
  • the further advantages of the method according to the invention have already been discussed in detail in connection with the tool used.
  • the method according to the invention comprises the steps according to claim 1.
  • the term “movement of the workpiece and / or the tool” means “moving the workpiece and / or the tool” understand is. Furthermore, in the method according to the invention with a circular machining edge of an annular tool face of a base body of the tool, the first functional surface, in particular workpiece end face, of the workpiece is processed. Partly at the same time, the second functional surface, in particular a chamfer, of the workpiece is machined with a conical projection on the tool end face.
  • the workpiece and / or the tool is moved along the workpiece rotation axis or slightly obliquely thereto.
  • the angle of attack ⁇ is selected such that the workpiece rotational axis and the tool rotational axis intersect on a side of the first functional surface facing the tool.
  • the angle of attack ⁇ is selected such that the workpiece rotation axis and the tool rotation axis intersect on a side of the first functional surface facing away from the tool.
  • a burr-free edge in particular a sealing edge, is formed between the first functional surface and the second functional surface. Since in the method according to the invention, the two adjoining functional surfaces are produced in one processing step and thus at least partially simultaneously, it is possible to produce this burr-free or sharp edge.
  • a diameter of the edge, in particular sealing edge can be adjusted by a radial offset between the tool and the workpiece.
  • radial offset is meant here the displacement of, for example, the workpiece parallel to the workpiece rotation axis.
  • the tool according to the invention can also be offset in a corresponding manner.
  • the sealing edge diameter is not only due to the radial Set offset, but can be corrected by this radial offset also steadily.
  • the shape, in particular the concavity or convexity, of the first functional surface is formed or produced as a function of the angle of attack and / or a diameter of the machining edge and / or of the radial offset. If, for example, the diameter of the processing edge is once dressed, only the front surface needs to be dressed at regular intervals. Since the first functional surface, i.e., the preferred shape, is determined essentially by the diameter of the machining edge and the angle of attack or the change in the angle of attack, the quality of the first functional surface remains constant.
  • the clearance angle ⁇ is greater than the angle of attack ⁇ selected for generating a convex first functional surface, so that even at ⁇ ⁇ 90 ° a convex first functional surface can be generated with sharp transition to the second functional surface.
  • the method according to the invention is used particularly advantageously in that the first functional surface and the second functional surface are produced on a part of a fuel injection system, in particular a coupler sleeve.
  • the invention is thus used, for example, in the fine machining of various products from diesel injection technology, in which a plurality of functional surfaces on end faces have to be processed.
  • Particular advantages result from the method according to the invention, as soon as a convex or concave preferred shape on a component end face for sealing function in combination with a sealing edge is required in the field of diesel injection technology, which must have no burr formation and be formed almost without rounding (sharp) got to.
  • the concavity or convexity can be just a few microns here.
  • FIG. 1 a tool 1 for the method according to a first embodiment of the present invention described.
  • FIG. 1 shows the rotating grinding tool, consisting of a base body 2, a conical extension 3 and a shaft 24.
  • the main body 2 may also be referred to as a grinding wheel.
  • FIG. 1 an already machined workpiece 4.
  • the main body 2 is cylindrical and has on its side facing the workpiece 4 an annular end face 22 with a round processing edge 21, formed as an outer edge on.
  • the annular end face 22 is formed as a ring around the conical projection 3.
  • the base body 2 is in the likewise cylindrical, but narrower shaft 24 via. This shaft 24 is used for clamping the tool 1 in the machine tool.
  • a tool rotation axis 23 is located. To this tool rotation axis 23, the tool 1 rotates rotationally symmetrical. Further, a clearance angle ⁇ denotes a funnel-shaped collapse of the annular end surface 22.
  • the conical extension 3 has a lateral surface 31 and a frustoconical surface 32.
  • the conical projection 3 is located centrally and thus rotationally symmetrical on the base body 2 of the tool 1. Around this conical projection 3 around the annular end face 22 is formed.
  • the workpiece 4 has a first functional surface 41, also called the workpiece end face or preferred form. Laterally on this first functional surface 41, a second functional surface 42 in the form of a conical chamfer is formed on the workpiece 4. This second functional surface 42 thus forms the transition from the first functional surface 41 to the lateral surface of the rotationally symmetrical workpiece 4. Between the first functional surface 41 and the second functional surface 42, a sealing edge 43 is formed. This sealing edge 43 is sharp and burr-free.
  • the workpiece 4 rotates about a workpiece rotation axis 44.
  • FIG. 1 Also geometric sizes of the tool 1 and the workpiece 4.
  • the tool 1 has at its thickest point, the base body 2, the tool diameter D wz .
  • the annular tool end face 22 has the ring width b r .
  • the truncated cone diameter D f is located at the thinnest point of the conical projection 3.
  • the angle between the tool rotation axis 23 and the workpiece rotation axis 44 is referred to as the angle of attack ⁇ .
  • the lateral surface 31 of the conical projection 3 merges with the cone angle ⁇ .
  • the workpiece 4 rotates in a workpiece spindle, while the rotating tool 1 is set at the angle of attack ⁇ to the workpiece 4 and along the workpiece rotation axis 44 on the workpiece Workpiece 4 is moved.
  • the workpiece 4 can be moved or moved into the tool 1.
  • the machining edge 21 at the transition between tool diameter D wz and annular end face 22 of the tool 1 the convex or concave spherical first functional surface 41 is generated.
  • the workpiece rotation axis 44 intersects the tool rotation axis 23 on a tool-facing side z of the first functional surface 41 and results in a concave spherical first functional surface 41. If the tool 1 is employed with a negative angle ⁇ alternatively, the workpiece rotation axis 44 cuts the tool rotation axis 23 on one side facing away from the tool a of the first functional surface 41 and it is a spherically convex first functional surface 41 is generated. This will be addressed to the Figures 3 and 4 demonstrate.
  • the lateral surface 31 on the tool 1 or on the conical projection 3 generates the second functional surface 42 on the workpiece 4.
  • the lateral surface 31 may also be concave or convex to produce a second functional surface 42 with radius.
  • the clearance angle ⁇ is introduced at the annular end face 22 of the base body 2.
  • the degree of sharp-edged and free sealing edge 43 with the sealing edge diameter D ⁇ is formed on the workpiece 4 in addition to the first function spherical surface 41 at the transition between the first functional surface 41 and the second functional surface 42nd
  • the convexity or concavity of the spherical first functional surface 41 arises as a function of the pivoting of the setting angle ⁇ , the workpiece diameter D WZ and a radial offset e1, e2.
  • This radial offset e1, e2 is set between the machining edge 21 and the workpiece rotation axis 44.
  • FIG. 2 shows the workpiece 4 in plan view of its end face.
  • the workpiece 4 is in this case by the tool 1 according to the invention according to the first embodiment been edited.
  • Shown is the sealing edge 43 with a sealing edge diameter D ⁇ and a reliabilitysantanteneingriffsbahn 5 and a continuation engagement track 6.
  • the machining edge engaging track 5 is formed by the engagement of the machining edge 21 in the workpiece 4.
  • the continuation engagement track 6 results from the engagement of the lateral surface 31 of the conical projection 3 in the Workpiece 4.
  • FIG. 3 shows the tool 1 for the method according to a second embodiment and a machined workpiece 4.
  • the same or functionally identical parts are denoted by the same reference numerals as in the first embodiment.
  • the tool 1 in FIG. 3 has a significantly larger clearance angle ⁇ than the tool 1 according to the first embodiment. Furthermore, the first functional surface 41 is convex.
  • the angle of attack ⁇ is selected such that the workpiece rotation axis 44 intersects the tool rotation axis 23 on a side of the first functional surface 41 facing away from the tool. Further, the processing edge 21 is offset by a distance f from the workpiece rotation axis 44.
  • FIG. 4 shows the tool 1 for the method according to a third embodiment and a machined workpiece 4.
  • the same or functionally identical parts with the same reference numerals as in the first or second embodiment are designated.
  • the tool 1 in FIG. 4 has a clearance angle ⁇ of 90 °. Furthermore, the first functional surface 41 is convex. The angle of attack ⁇ corresponds to the angle of attack ⁇ from the second embodiment.
  • the end face 22 is divided into an annular first plane 22a and an annular second plane 22b closer to the shaft 24.
  • the processing edge 21 for processing the first functional surface 41 is seated on an inner side of the first plane 22a.
  • first functional surface 41 with a concavity of 5 microns (on a measuring section of 0.45 mm) and a sealing edge with a diameter D ⁇ of 5.8 mm produced in the components, which (at the transition of the concave surface first Function surface 41) to an outer chamfer (second functional surface 42) is formed at an angle of 20 °.
  • First scanning electronic investigations have already confirmed the sharp-edgedness and burr-freedom of the component, the process-reliable production of the concavity was verified by means of white-light interferometers.
  • the components are manufactured using this process for prototyping and also for series production, which means that cycle time and cost reduction can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (11)

  1. Procédé de meulage pour la production simultanée d'une face frontale d'une pièce en tant que première face fonctionnelle (41) et d'un biseau en tant que deuxième face fonctionnelle (42) adjacente à la première face fonctionnelle (41) sur une pièce (4), comprenant un outil de meulage (1) à symétrie de révolution, comprenant les étapes suivantes :
    - rotation de la pièce (4) autour d'un axe de rotation de pièce (44) et rotation de l'outil (1) autour d'un axe de rotation d'outil (23),
    - inclinaison de l'axe de rotation d'outil (23) et/ou de l'axe de rotation de pièce (44) l'un vers l'autre suivant un angle d'inclinaison (α), et
    - déplacement de la pièce (4) et/ou de l'outil (1) l'un par rapport à l'autre,
    - la première face fonctionnelle (41) de la pièce (4) étant usinée avec une arête d'usinage circulaire (21) ou avec une face frontale annulaire de l'outil (22) d'un corps de base (2) de l'outil (1), et
    - la deuxième face fonctionnelle (42) de la pièce (4) étant usinée avec une saillie conique (3) sur la face frontale de l'outil (22).
  2. Procédé de meulage selon la revendication 1, caractérisé en ce que pour une réalisation concave de la première face fonctionnelle (41), l'angle d'inclinaison (α) est choisi de telle sorte que l'axe de rotation de pièce (44) et l'axe de rotation d'outil (23) se coupent sur un côté de la première face fonctionnelle (41) tourné vers l'outil.
  3. Procédé de meulage selon la revendication 1, caractérisé en ce que pour une réalisation convexe de la première face fonctionnelle (41), l'angle d'inclinaison (α) est choisi de telle sorte que l'axe de rotation de pièce (44) et l'axe de rotation d'outil (23) se coupent sur un côté de la première face fonctionnelle (41) opposé à l'outil.
  4. Procédé de meulage selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'entre la première face fonctionnelle (41) et la deuxième face fonctionnelle (42) est réalisée une arête sans bavure (43), en particulier une arête d'étanchéité.
  5. Procédé de meulage selon la revendication 4, caractérisé en ce qu'un diamètre (Dκ) de l'arête (43) est ajusté par un décalage radial (e1, e2) entre l'outil (1) et la pièce (4).
  6. Procédé de meulage selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la forme de la première face fonctionnelle (41) est réalisée en fonction de l'angle d'inclinaison (α) et/ou d'un diamètre extérieur (DWZ) de l'arête d'usinage (21) et/ou du décalage radial (e1, e2).
  7. Procédé de meulage selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la première face fonctionnelle (41) et la deuxième face fonctionnelle (42) sont produites par le procédé sur une partie d'un système d'injection de carburant, en particulier d'un manchon de coupleur.
  8. Procédé de meulage selon l'une quelconque des revendications précédentes, caractérisé en ce que la face frontale d'outil (22) attaque par rapport à un axe de rotation d'outil (23) suivant un angle de dépouille (γ), ou la face frontale d'outil (22) est perpendiculaire à l'axe de rotation d'outil (23).
  9. Procédé de meulage selon l'une quelconque des revendications précédentes, caractérisé en ce que l'arête d'usinage circulaire (21) est arrondie.
  10. Procédé de meulage selon l'une quelconque des revendications précédentes, caractérisé en ce que la saillie conique (3) est réalisée sous forme de tronc de cône.
  11. Procédé de meulage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une face d'enveloppe (31) de la saillie conique (3) est réalisée sous forme plane ou concave ou convexe.
EP20090161059 2008-07-11 2009-05-26 Procédé de meulage pour la production simultanée de deux surfaces fonctionnelles sur une pièce Not-in-force EP2143529B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040347 2008-07-11
DE102008040699A DE102008040699A1 (de) 2008-07-11 2008-07-24 Werkzeug sowie zugehöriges Verfahren zur simultanen Erzeugung zweier Funktionsflächen an einem Werkstück

Publications (3)

Publication Number Publication Date
EP2143529A2 EP2143529A2 (fr) 2010-01-13
EP2143529A3 EP2143529A3 (fr) 2013-06-19
EP2143529B1 true EP2143529B1 (fr) 2015-01-07

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EP20090161059 Not-in-force EP2143529B1 (fr) 2008-07-11 2009-05-26 Procédé de meulage pour la production simultanée de deux surfaces fonctionnelles sur une pièce

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DE (1) DE102008040699A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103692340A (zh) * 2013-12-10 2014-04-02 北京航科发动机控制系统科技有限公司 一种用于滑靴零件内球面的研磨杆

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR921586A (fr) * 1943-03-09 1947-05-12 Pierre à affûter
US2836939A (en) * 1955-03-24 1958-06-03 White Arthur Howard Machine for producing spherical surfaces
US5537987A (en) * 1994-04-13 1996-07-23 Suruga Kogyo Ltd. Apparatus and method for processing and cutting structural concrete
JP2006021291A (ja) * 2004-07-09 2006-01-26 Tokyo Seimitsu Co Ltd 研削砥石、研削装置、及び研削方法

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EP2143529A2 (fr) 2010-01-13
DE102008040699A1 (de) 2010-01-14
EP2143529A3 (fr) 2013-06-19

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