EP1525073B1 - Verfahren und vorrichtung zum schleifen eines rotationssymmetrischen maschinenbauteils - Google Patents

Verfahren und vorrichtung zum schleifen eines rotationssymmetrischen maschinenbauteils Download PDF

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Publication number
EP1525073B1
EP1525073B1 EP03766346A EP03766346A EP1525073B1 EP 1525073 B1 EP1525073 B1 EP 1525073B1 EP 03766346 A EP03766346 A EP 03766346A EP 03766346 A EP03766346 A EP 03766346A EP 1525073 B1 EP1525073 B1 EP 1525073B1
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EP
European Patent Office
Prior art keywords
grinding
machine part
spindle
clamping
disk
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.)
Expired - Fee Related
Application number
EP03766346A
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German (de)
English (en)
French (fr)
Other versions
EP1525073A1 (de
Inventor
Erwin Junker
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.)
Erwin Junker Maschinenfabrik GmbH
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Erwin Junker Maschinenfabrik GmbH
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Publication of EP1525073A1 publication Critical patent/EP1525073A1/de
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Classifications

    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/14—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding conical surfaces, e.g. of centres
    • 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
    • B24B27/00—Other grinding machines or devices
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0084—Other grinding machines or devices the grinding wheel support being angularly adjustable
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/02—Frames; Beds; Carriages
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs

Definitions

  • the invention relates to a method for grinding a rotationally symmetrical machine component with two axle parts and an intermediate therewith, enlarged in diameter central part, on which an active surface in the form of a particular flat truncated cone with a rectilinear or curved contour in cross section is formed.
  • Machine components of this type are, for example, in transmissions with continuously variable ratio, as required in motor vehicles.
  • two machine components face each other with facing active surfaces.
  • the active surfaces thus form a Ringraurn with approximately wedge-shaped cross-section, in which a tension member such as a chain or a belt depending on the distance of the active surfaces of each other back and forth between different radii. Since such a transmission must work very accurately and transmit large torques, high demands are placed on the dimensional accuracy and the surface quality of the machine components. This also applies to the associated grinding operations, especially when grinding the active surface.
  • the active surface is ground by means of corundum grinding wheels in Schräginstechmaschine.
  • the cylindrical outer surfaces of the associated axle parts are also ground, which are generally graduated in diameter.
  • a universal grinding station for tool grinding is known, which allows a variety of possible combinations in the mutual position assignment of grinding heads and tool carriers. Also known is a grinding head with two different grinding wheels (DE 37 24 698 A1), with the various grinding operations can be performed in a workpiece clamping. There is already a proposal (DE 199 21 785 A1) to grind relevant machine components in one clamping, with two separate grinding spindles are used.
  • the machine component to be ground thus remains in a single set-up in which all grinding operations are carried out.
  • the grinding spindle is pivoted about two mutually perpendicular pivot axes and in addition to the machine component parallel to its longitudinal axis and perpendicular to it (X-axis) is moved.
  • the grinding spindle can thus be brought into any desired position relative to the machine component, so that it is possible to grind both the active surface and further, located on the machine component cylindrical outer surfaces with grinding wheels of basically cylindrical contour.
  • the first grinding wheel of cylindrical basic shape will also have an outer contour that is rectilinear in cross-section in the case of an effective surface with a contour that is rectilinear in cross-section. If the effective surface is curved, the grinding wheel must have a slightly curved, adapted contour in cross-section in cylindrical basic shape. The bulges occurring in practice are very small.
  • the possibility of movement of the grinding spindle relative to the machine component parallel to its longitudinal axis opens up the possibility of grinding the active surface with the cylindrical peripheral surface of the grinding wheel in a perpendicular grinding process, said relative displacement effecting the feed. Since in the machine components of the type in question here the effective surface has the shape of a flat truncated cone, it is sufficient to make the feed during grinding of the active surface by the grinding spindle and the machine component parallel to its longitudinal axis and perpendicular thereto (X-axis ) is moved. Of this movement is attributable to the grinding point on the active surface only an obliquely directed component, but deviates only by a small amount from the direction of the longitudinal axis, so that there is almost a vertical grinding in the usual sense.
  • the advantage is a constant cutting speed over the entire width of the grinding wheel. This ensures an increased surface quality and surface structure.
  • optimized dressing parameters are obtained when dressing the grinding wheel, because during dressing the same parameters, namely a identical dressing speed as during grinding and the same speed ratios and feed values are achieved. Because the cutting speed of the grinding wheel remains the same over the effective surface, the achievable surface roughness is consistent. Due to the same cutting speed of the grinding wheel over the complete “conical surface", optimal values for the cutting volume per unit time can be achieved.
  • the outer diameter of the conical disk is assumed to have a diameter of, for example, 190 mm and a diameter of 40 mm adjoining the conical surface, the workpiece speed changes by a factor of 4.75 due to the rotation of the workpiece during grinding.
  • the height of the conical surface is thus about 75 mm.
  • the cutting speed at the outside diameter of the conical surface is then about 80% of the cutting speed of the grinding wheel at the small diameter of the conical surface. This is opposite to the cutting volume, since this is highest at the large diameter at the conical surface.
  • the cutting speed ratio to the cutting volume, which must be removed via the conical surface is substantially improved by the grinding wheel set perpendicular to the conical surface.
  • the grinding process according to the invention can therefore be carried out optimally with ceramic-bonded CBN grinding wheels. Overall, a significantly reduced number of cycles on modern processing machines at the same time considerably improved grinding result.
  • the active surface of the machine component is ground by a grinding wheel located on the first grinding wheel of cylindrical shape and rectilinear or adapted curved peripheral contour is made perpendicular to the active surface, wherein the axial extent of the grinding wheel covers the radial oblique stretch of the active surface and the delivery takes place by the grinding wheel and the machine component are moved in the direction of its longitudinal axis relative to each other.
  • the first grinding wheel has a greater axial extent, so that the entire active surface can be finished in a process of vertical grinding.
  • the effective surface of the machine component is a truncated cone shell with a contour which is rectilinear in cross-section
  • the first grinding wheel can have a cylindrical shape.
  • a curved cross-section contour of the active surface and a suitably curved peripheral contour of the first grinding wheel is required.
  • a second grinding wheel is used with which the said cylindrical outer surfaces are ground by longitudinal grinding;
  • the second grinding wheel is coaxially with the first grinding wheel on the grinding spindle and the second grinding wheel preferably has a significantly smaller width than the first grinding wheel, so that a longitudinal grinding of cylindrical outer contours can be made easily.
  • the longitudinal grinding of the cylindrical outer surfaces located on the machine component takes place by means of peeling grinding, in which grinding is carried out in a known manner in one pass down to the final dimension. Since all the prerequisites for a high-quality grinding process are present as a result of the constant clamping, it is possible here to work in the peeling method, whereby the cycle time is further reduced with high grinding quality.
  • the cylindrical outer surfaces to be ground can ggs. also be edited by plunge grinding.
  • the machine component is advantageously clamped between tips and driven from at least one of the tips for rotation.
  • the exact centering is least disturbed despite the rotary drive. This also results in a high quality of the grinding result.
  • the invention also relates to a device for grinding a rotationally symmetrical machine component of the type mentioned at the outset already mentioned in connection with the method. It consists in a device according to the features of claim 7.
  • the device according to the invention comprises a flying arrangement of both grinding wheels on one and the same side of the grinding spindle. This results in a structurally simple design of the grinding spindle, which is readily achievable by grading the diameter of both grinding wheels, that the two grinding wheels do not interfere with each other in the different processing operations.
  • the clamping and drive members are formed for clamping the machine component by attached to a workpiece headstock and tailstock quills centering with them at the tips engage in frontal bores of the machine component, and if at least located on the workpiece headstock with a coupling is provided, which communicates with the frontal bore of the machine component via radially acting from inside to outside tendons for the purpose of the rotary driving in operative connection.
  • the rotary drive of the machine component from the inside of a centering this machine component tip means that the centering is not disturbed by the rotary drive.
  • the radially outwardly acting tendons do not apply axial forces to the machine component and the tips.
  • stresses and deflections of the machine component remain despite a reliable rotational drive. It is thus a reliable rotary drive connected to a centering of high consistent accuracy.
  • such a coupling can be realized in that it is designed as Sp Dr Druskupplung whose outwardly to be spread tenders are designed as clamping jaws and are arranged in the region of the tip of a longitudinal bore of the workpiece headstock shaft, and that the actuation of the Tensioning members by a tie rod, which is passed through the longitudinal bore and provided in the clamping jaws with a Betäf Trentskonus.
  • the required mutual longitudinal displacement of the machine component and the grinding spindle slide can advantageously be realized in that the clamping and drive members for clamping and for rotary drive of the machine component are located on a grinding table which is movable relative to the grinding spindle slide in the longitudinal direction of the machine component.
  • a grinding headstock is arranged on the grinding spindle slide via a first pivot axis perpendicular to its displacement plane, on which the grinding spindle is pivotable about a second pivot axis, which is perpendicular to the first pivot axis runs.
  • the grinding spindle can be brought particularly advantageous in the various processing positions on the machine component, wherein the two grinding wheels do not interfere with each other.
  • the device according to the invention is to be equipped with ceramic-bonded CBN grinding wheels, because they have a particularly long service life and lead to a particularly good grinding result in the device according to the invention. This applies in particular to the first grinding wheel for grinding the effective surface.
  • FIG. 1 shows a device according to the invention for grinding, with which in particular the method according to the invention is to be carried out.
  • the device according to Figure 1 consists of a machine bed 1, on which a workpiece headstock 2 and a tailstock 3 are mounted.
  • Workpiece headstock 2 and tailstock 3 have the usual (not designated) sleeves with the shafts 4, 5 located at tips 6 and 7, between which the machine component 17 to be ground is clamped.
  • the workpiece headstock 2 and the tailstock 3 are arranged on a grinding table 8, which is movable in the longitudinal direction of the machine component 17. After clamping, the machine component 17, the workpiece headstock 2 and the tailstock 3 have a common longitudinal axis 23, which can be regarded as a reference line for the arrangement of the remaining parts.
  • a grinding spindle slide 9 is further shown schematically, which can be moved by means of an adjusting motor 10 in a direction perpendicular to the longitudinal axis 23.
  • a wheel spindle 11 is mounted, which can be pivoted about a first pivot axis 12.
  • the first pivot axis 12 is perpendicular to the displacement plane of the grinding spindle slide 9 and is thus usually aligned vertically.
  • a grinding spindle 14 is attached; it is connected via a second pivot axis 13 pivotally connected to the wheel spindle 11.
  • the position of the second pivot axis 13 can be imagined from FIG.
  • the second pivot axis 13 is perpendicular to the first pivot axis 12 and cuts at the usual occurring positions the common longitudinal axis 23 of the workpiece headstock 2, machine component 17 and tailstock 3rd
  • the machine component 17 to be ground consists of a first axle part 18, a second axle part 19 and a central part 20 located therebetween, whose outside diameter D is significantly greater than that of the axle parts located therefrom.
  • Essential for the central part 20 is an area in the basic shape of a truncated cone 21.
  • the truncated cone jacket can have a rectilinear, but also a convex or concave curved contour in cross section.
  • Such machine components form, for example in automatic transmissions, an active surface 22 on which a chain or a belt can travel along changing radii. In this case, two such active surfaces are then placed against each other, and the chain or belt is in between.
  • the machine component but also has cylindrical outer surfaces 24, which must also be ground; these surfaces are all designated in FIG. With the line 28 in Figure 4, the action or contact line between the first grinding wheel 15 and the active surface 22 is designated; in this contact line 28 is the Cutting speed of the grinding wheel, that is their speed on the outer circumference, of great importance.
  • bezels 26 and 27 which can support the tips 6 and 7 of the workpiece headstock and the tailstock.
  • an increased space requirement between the workpiece headstock 2 and the tailstock 3 arises, as shown in FIG. 4, by the temporary tilting of the grinding spindle 14.
  • the shanks 4 and 5 of the tips 6 and 7 must therefore be made relatively long; Therefore, with very high demands on the grinding accuracy, they are supported by the steady rests 26 and 27, so that they do not bend under the action of the grinding wheels.
  • the tip 6 is extended in a cylindrical extension 29 of small diameter.
  • the tip 6 and its shaft 4 are penetrated over their entire length by a longitudinal bore 30 in which a pull rod 31 is guided.
  • This has at its one end a threaded portion 32 which serves to move the pull rod back and forth via suitable actuating mechanisms.
  • an actuating cone 33 is formed, which in turn cooperates with tendons located on it.
  • the tendons are formed by clamping jaws 36.
  • a first clamping ring 34 and a second clamping ring 35 are present, which may for example consist of slotted metal rings or of a rubber-like material.
  • the clamping rings 34 and 35 hold the jaws 36 in place in the tip 6 and prevent horizontal displacement of the jaws; the clamping jaws are displaceable only in one direction perpendicular to the pull rod.
  • the axially directed force component coming through the first clamping ring 34 is small and can be neglected.
  • the said parts form within the cylindrical Fortwaldes 29 a Sp Schwarzkonus coupling.
  • three clamping jaws 36 may be present at intervals of 120 degrees. If the pull rod 31 is now pulled to the left in FIG. 7, the actuating cone 33 pushes the clamping jaws 36 outwards, as a result of which the first clamping ring 34 is compressed axially and the second clamping ring 35 is pressed radially outward.
  • the grinding spindle 14 In the first processing phase, in which the active surface 22 is ground, the grinding spindle 14 is located by pivoting about the first pivot axis 12 in the apparent from Figures 1 and 4 position. Corresponding to the cone angle of the active surface 22 and the grinding spindle 14 is slightly inclined, so that the first grinding wheel 15 is employed with its circumference substantially perpendicular to the effective surface to be ground 22 to be ground.
  • the outer contour of the first grinding wheel 15 will also be rectilinear.
  • the effective surface 22 is concavely or convexly curved, the first grinding wheel 15 must have an oppositely-adapted curvature. The occurring in practice curvatures on the active surfaces of such machine components are relatively low.
  • the advantage that the cutting speed of the grinding wheel over the entire axial extension of the grinding wheel 15 is substantially the same. This is a decisive advantage over the usual Schrägeinstechschleifen.
  • the grinding allowance 25 can be removed in a single vertical grinding process and the desired high-grade grinding state of the active surface 22 can be achieved.
  • the feed movement takes place by the grinding table 8 is moved in the direction of the longitudinal axis 23.
  • On the contact line 28 on the active surface 22 eliminates a corresponding oblique component.
  • the grinding table could also be fixed and the grinding spindle slide 9 moved.
  • the grinding spindle slide 9 is driven a short distance away from the machine component 17, and the grinding headstock 11 is rotated about the first pivot axis 12, which is perpendicular to the displacement plane of the grinding spindle slide.
  • the grinding spindle 14 is then moved to the position shown in FIGS. 2 and 5. In this position, a longitudinal grinding of all cylindrical outer surfaces 24, which are located on the central part 20 and the second axle 19, take place by means of the second grinding wheel 16.
  • peeling grinding is preferred in which grinding is performed immediately in an axial passage up to the finished diameter.
  • the longitudinal feed also takes place here by moving the grinding table 8.
  • the grinding spindle 14 is pivoted about the second, horizontally extending pivot axis 13 - as it were "overhead" - so that the two grinding wheels 15 and 16 now the apparent from Figures 3 and 6 position relative to the sanding Assume machine component 17.
  • the remaining outer surfaces 24 can be ground longitudinally in the area of the first axle part, for which purpose again the second grinding wheel 16 is used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP03766346A 2002-07-30 2003-07-29 Verfahren und vorrichtung zum schleifen eines rotationssymmetrischen maschinenbauteils Expired - Fee Related EP1525073B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10234707A DE10234707B4 (de) 2002-07-30 2002-07-30 Verfahren und Vorrichtung zum Schleifen eines rotationssymmetrischen Maschinenbauteils
DE10234707 2002-07-30
PCT/EP2003/008374 WO2004012903A1 (de) 2002-07-30 2003-07-29 Verfahren und vorrictung zum schleifen eines rotationssymmetrischen maschinenbauteils

Publications (2)

Publication Number Publication Date
EP1525073A1 EP1525073A1 (de) 2005-04-27
EP1525073B1 true EP1525073B1 (de) 2006-05-24

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ID=30774952

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Application Number Title Priority Date Filing Date
EP03766346A Expired - Fee Related EP1525073B1 (de) 2002-07-30 2003-07-29 Verfahren und vorrichtung zum schleifen eines rotationssymmetrischen maschinenbauteils

Country Status (12)

Country Link
US (1) US7147547B2 (ko)
EP (1) EP1525073B1 (ko)
JP (1) JP4169739B2 (ko)
KR (1) KR101002609B1 (ko)
CN (1) CN100333876C (ko)
AU (1) AU2003251663A1 (ko)
BR (1) BR0313061A (ko)
CA (1) CA2491686C (ko)
DE (2) DE10234707B4 (ko)
ES (1) ES2263030T3 (ko)
RU (1) RU2318648C2 (ko)
WO (1) WO2004012903A1 (ko)

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CN107363687B (zh) * 2017-09-01 2023-05-05 贵阳天龙摩擦材料有限公司 平面及内外弧磨床及其磨削方法
CN107584388A (zh) * 2017-10-24 2018-01-16 浙江晟禧精密机械科技有限公司 一种钢球展开轮磨床
CN108214112B (zh) * 2018-01-11 2019-12-20 浙江苏泊尔股份有限公司 一种炊具纹理制造方法及炊具
US10654144B2 (en) * 2018-01-17 2020-05-19 Dave Phelps Spindle reconditioning system
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CA2491686C (en) 2010-10-19
RU2318648C2 (ru) 2008-03-10
CN100333876C (zh) 2007-08-29
US7147547B2 (en) 2006-12-12
KR101002609B1 (ko) 2010-12-20
DE10234707A1 (de) 2004-02-26
WO2004012903A1 (de) 2004-02-12
BR0313061A (pt) 2005-06-28
KR20050023436A (ko) 2005-03-09
AU2003251663A1 (en) 2004-02-23
RU2005105317A (ru) 2005-07-27
EP1525073A1 (de) 2005-04-27
JP4169739B2 (ja) 2008-10-22
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ES2263030T3 (es) 2006-12-01
US20050255793A1 (en) 2005-11-17

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