EP0781627A1 - Machine de micro-finition - Google Patents

Machine de micro-finition Download PDF

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Publication number
EP0781627A1
EP0781627A1 EP95120683A EP95120683A EP0781627A1 EP 0781627 A1 EP0781627 A1 EP 0781627A1 EP 95120683 A EP95120683 A EP 95120683A EP 95120683 A EP95120683 A EP 95120683A EP 0781627 A1 EP0781627 A1 EP 0781627A1
Authority
EP
European Patent Office
Prior art keywords
shell
machine according
workpiece
microfinishing machine
microfinishing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95120683A
Other languages
German (de)
English (en)
Other versions
EP0781627B1 (fr
Inventor
Erfindernennung liegt noch nicht vor Die
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.)
Supfina Grieshaber GmbH and Co KG
Original Assignee
Supfina Grieshaber 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 Supfina Grieshaber GmbH and Co KG filed Critical Supfina Grieshaber GmbH and Co KG
Priority to EP19950120683 priority Critical patent/EP0781627B1/fr
Priority to DE59508072T priority patent/DE59508072D1/de
Publication of EP0781627A1 publication Critical patent/EP0781627A1/fr
Application granted granted Critical
Publication of EP0781627B1 publication Critical patent/EP0781627B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B5/36—Single-purpose machines or devices
    • B24B5/42—Single-purpose machines or devices for grinding crankshafts or crankpins
    • 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
    • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

Definitions

  • the invention relates to a microfinishing machine for machining cylindrical inner or outer surfaces of a workpiece, with at least one finishing element resting on the inner or outer surface of the workpiece, with a clamping means to press the finishing element against the surface to be machined, and with means for generating a Relative movement between the workpiece and the finishing element, the finishing element having at least one C-shaped shell which partially encompasses the surface to be machined.
  • a large number of such fine processing machines which are also referred to as honing machines or superfinishing machines, are known. With these machines, for example, the surfaces of crankshaft bearings or journals or the surfaces of camshaft bearings are machined. With machines of this type, the surface quality of the bearing points on the one hand and the desired roundness on the other hand are achieved.
  • a finishing stone is pressed onto the surface of the workpiece to be machined either directly or a bowl with the interposition of an abrasive belt, and the workpiece is generally set in rotation. At the same time, the workpiece can perform an axial oscillation movement, so that a so-called cross-cut is created. The oscillation movement can also be carried out by the tool.
  • the object of the invention is to provide a fine processing machine with which an optimal work result can be achieved in superfinishing.
  • the shell is so flexible that it can adapt radially to the surface to be machined in a circular geometry.
  • the flexible design of the shell now creates the possibility that it can be radially adjusted when the workpiece diameter changes, so that it can rest against the workpiece in a circular geometry over its entire length at any time.
  • This has the advantage that the local contact pressure remains constant and that the grinding belt is optimally used.
  • the shell adapts permanently to the changing diameter of the workpiece to be machined Workpiece surface. The peaks of ripples can thus be removed and a shape correction can be achieved.
  • Such shells are therefore adaptive.
  • the surface of the shell facing the workpiece to be machined has at least one open-edge recess running parallel to the axis of rotation, e.g. is provided with a slot.
  • the shell which is generally made of a rigid, unyielding material, is given a certain flexibility or elasticity.
  • the slots run radially or radially to the workpiece, so that the shell can be slightly deformed orthogonally to the rays and the loop diameter can thereby be changed. In this way, the curvature of the shell can be adapted to different machining diameters. The change is in the range of a few ⁇ m.
  • the surface of the shell facing away from the workpiece to be machined is provided with at least one open-ended recess running parallel to the axis of rotation, for example a slot.
  • both surfaces are provided with slots.
  • the shell is highly flexible when the material is very hard and brittle, such as with stone or ceramics.
  • the slots can gap be staggered.
  • the cross-section of the shell has an essentially lamellar shape, the lamella tips resting on the workpiece.
  • the slots can have any cross section, but advantageously have a substantially rectangular cross section.
  • the elasticity of the shell is determined by the depth of the slots, the depth of the slots advantageously being equal to or greater than half the thickness of the adaptive shell.
  • the slot depth corresponds to approximately 80% of the thickness of the shell.
  • the width of the slots and the spacing of the slots can be chosen so that there is still a sufficient contact area of the shell.
  • the slot width can be 5% to 40%, in particular 25% of the contact area, depending on the requirement.
  • the shell is preferably a pressure element for an abrasive belt coated with an abrasive. With such a bowl, it is ensured that the grinding belt lies against the surface to be machined with the same local contact pressure over the entire length of the bowl, this being independent of the current diameter of the workpiece.
  • the shell is a pressure element for an abrasive coated, especially thin abrasive belt. This fact is nevertheless taken into account by the adaptive shell.
  • the change in thickness of the tape can be restricted by using thin-film tapes or films. Such tapes, which, for example, have a thickness of 200 ⁇ m in the unused state, have a thickness of approximately 100 ⁇ m in the state of wear.
  • the shell is coated on its surface abutting the workpiece with abrasives, in particular with CBN (cubic boron nitride), diamond, etc.
  • the shell itself serves as a removal tool, as a result of which a higher dimensional accuracy is achieved.
  • the shell contains bound abrasive e.g. Corundum, SiCa and is designed like a grindstone.
  • bound abrasive e.g. Corundum, SiCa and is designed like a grindstone.
  • the shell is an expansion shoe.
  • the shoe has a cavity for a pressure medium that extends parallel or coaxially to the contact surface.
  • the wall between the cavity and the contact surface is so flexible that it is during the processing of everyone Diameter change can follow, but at the start of machining only the shaft tips of the surface are processed.
  • the expansion shoe is made of a flexible, fluid-tight material, e.g. Steel, rubber, plastic or the like
  • the expansion shoe can serve as a support for the lamellar pressure element. In this way, the pressure element is supported over the entire surface and each lamella is optimally adjusted in the radial direction.
  • the lamellar pressing element can also be supported at points.
  • the invention also relates to an adaptive finishing element for a precision machining machine, the element having one or more of the above features.
  • the shell can be in one or more parts, or two shells can be combined with one another.
  • FIG 1 this is a workpiece 1, e.g. a crankshaft bearing, facing the end of a processing pliers 2 is shown schematically, the two arms 3 and 4 of the pliers 2 are shown in Figure 1 in their closed position.
  • the processing arm 3 has at its free end a shoe 5 which is connected to the processing arm 3 via two fastening screws 6.
  • the shoe 5 is screwed onto the side of the arm 3 facing the workpiece 1.
  • the processing shoe 5 is provided on its side facing the workpiece 1 with an essentially part-circular recess 7, in which a flexible processing shell 8 is received via two fastening elements 9 and 10.
  • the other processing arm 4 carries, on its side facing the workpiece 1, a measuring device, generally designated 11, which is not identified in more detail and with which in-process measurements can be carried out.
  • a measuring device e.g. during machining the diameter of the workpiece 1 and surface ripples are measured.
  • the material removal from the workpiece 1 takes place via an abrasive belt 12, which is fed between the two processing arms 3 and 4 of the flexible processing shell 8 and is pressed onto the surface of the workpiece 1 by the flexible processing shell 8.
  • the grinding belt 12 lies along the entire length of the processing shell 8, ie over the entire length of the Machining shell 8 covered circumferential angle on the workpiece 1 and is continuously or gradually removed in the lower area.
  • the sanding belt 12 is deflected over two deflection rollers 13 and conveyed in the direction of arrow 14.
  • the abrasive belt 12 is stressed and tensioned with a tensioning device, denoted overall by 15.
  • the removal is usually 5 ⁇ m to 8 ⁇ m, but can also be 30 ⁇ m for in-process measurements. Out of roundness from 2 ⁇ m to 5 ⁇ m is corrected, ie removed.
  • FIG. 2 shows an enlarged illustration of the flexible processing shell 8 resting on the workpiece 1. It can be clearly seen that the shell 8 presses the abrasive belt 12 against the surface of the workpiece 1 over its entire length.
  • the processing tray 8 supports the grinding belt 12 with its first surface 16 facing the workpiece 1.
  • the processing shell 8 is given flexibility by open-edge slots 17 and 18, the slots 17 being open to the first surface 16 and the slots 18 being open to the opposite second surface 19.
  • the slots 17 and 18 extend radially over approximately 80% of the total thickness d of the processing shell 8.
  • the depth a of the slots 18 open to the outer surface can be equal to the depth b of the slots 17; the two slots 17 and 18 can also have different depths a and b.
  • the slots 17 and 18 are arranged on a gap, so that the processing shell 8 has a substantially meandering shape or a lamella shape.
  • the processing shell 8 is relatively stiff in the direction of the thickness d, ie in the radial direction of the workpiece 1, so that the grinding belt 12 can be pressed firmly onto the surface of the workpiece 1.
  • the slots 17 and 18 give the individual shell sections 20 of the processing shell 8 a high degree of flexibility or elasticity in the radial direction relative to one another, the shell sections 20 being inherently rigid in the radial direction.
  • the shell sections 20 form individual U-shaped section bodies, the adjacent free legs of which are connected to one another.
  • FIG. 2a shows four preferred embodiments of the adaptive shell 8.
  • 29 and 30 slots are referred to, which extend from the inner or outer surface of the shell to approximately the middle of the shell.
  • the slots 29 and 30 are arranged offset to one another, but they can also lie opposite one another.
  • Shell 8 is formed by two shell elements 8 'and 8''which are coaxially adjacent to one another. Corresponding slots 18 and 17 lie radially one above the other.
  • the illustrated embodiments are only to be understood as examples and are not intended to be conclusive.
  • two mutually opposite flexible processing trays 8 are shown, which, however, are not supported point-like, as in the exemplary embodiment in FIG. 1, but are supported over almost their entire second surface 19 by means of a supporting element 21.
  • This support element 21 is inserted into the recess 7 of the shoe 5 and transmits the pressing force acting in the direction of the arrow 22 evenly to the flexible processing shell 8.
  • the support element 21 can e.g. made of steel, plastic, rubber, felt, wood or the like. In any case, it is guaranteed that the contact pressure is transmitted evenly.
  • either two grinding belts 12 are used, or the same grinding belt is deflected after the first pass and brought back to the workpiece 1.
  • the flexible processing shell 8 is formed by an expansion clamping shoe 23 which lies in the recess 7 of the shoe 5.
  • This Expansion shoe 23 is provided with a cavity 24, which extends over the entire length of the expansion shoe 23 and is arranged immediately behind the first surface 16.
  • a relatively thin wall 25 bears against the workpiece 1.
  • the cavity 24 is filled with a pressure medium and sealed. If the two shoes 5 are pressed onto the workpiece 1 in the direction of the arrows 22, the contact pressure is distributed uniformly over the entire surface of the wall 25.
  • the pressure medium is, for example, hydraulic oil or detergent medium.
  • the grinding belt 12 lies directly against the wall 25 of the expansion shoe 23.
  • a flexible processing shell is arranged on the expansion shoe. The advantage is achieved that each individual shell section 20 is pressed onto the grinding belt with the same pressure.
  • FIGS. 5 and 6 Conventional hard shells 26 are shown in FIGS. 5 and 6.
  • 5 shows the position of the shoe 26 in a greatly exaggerated manner at the start of the machining process.
  • the free ends 27 of the hard shell 26 mainly press the grinding belt 12 onto the surface of the workpiece 1, whereas the central region 28 is hardly involved in the material removal. It is easy to see that the hard shell 26 has a ripple of the workpiece 1 follows, since it rests only on the free ends 27 on the workpiece surface. A shape correction cannot be achieved or can only be achieved slightly at this processing stage.
  • the central region 28 is mainly in contact with the sanding belt 12 and presses it onto the workpiece 1 with high force, the free ends 27 only slightly pressing the sanding belt 12 onto the workpiece 1 press on.
  • a shape correction can also be achieved with such hard shells 26, but this is not as effective as with the flexible processing shell 8 according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP19950120683 1995-12-28 1995-12-28 Machine de micro-finition Expired - Lifetime EP0781627B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19950120683 EP0781627B1 (fr) 1995-12-28 1995-12-28 Machine de micro-finition
DE59508072T DE59508072D1 (de) 1995-12-28 1995-12-28 Feinstbearbeitungsmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950120683 EP0781627B1 (fr) 1995-12-28 1995-12-28 Machine de micro-finition

Publications (2)

Publication Number Publication Date
EP0781627A1 true EP0781627A1 (fr) 1997-07-02
EP0781627B1 EP0781627B1 (fr) 2000-03-22

Family

ID=8219933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950120683 Expired - Lifetime EP0781627B1 (fr) 1995-12-28 1995-12-28 Machine de micro-finition

Country Status (2)

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EP (1) EP0781627B1 (fr)
DE (1) DE59508072D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1506839A1 (fr) * 2003-08-15 2005-02-16 Supfina Grieshaber GmbH & Co. KG Outil de finition
DE10332605A1 (de) * 2003-07-17 2005-02-17 Ibz Gmbh Anpressvorrichtung für eine Oberflächenbearbeitungsvorrichtung
EP2327510A1 (fr) 2009-11-25 2011-06-01 Supfina Grieshaber GmbH & Co. KG Dispositif de finition
US8517804B2 (en) 2007-10-16 2013-08-27 Nagel Maschinen- Und Werkzeugfabrik Gmbh Pressing device for cutting means and apparatus and method for finishing circumferential surfaces on cylindrical parts of a workpiece
CN116587148A (zh) * 2023-07-17 2023-08-15 智龙直线(瑞金)科技有限公司 一种用于滑座球沟的抛光装置及其抛光方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2079743A5 (fr) * 1970-02-11 1971-11-12 Spidem Ste Nle
EP0161748A2 (fr) * 1984-05-07 1985-11-21 Industrial Metal Products Corporation Appareil et procédé pour le microfinissage de surfaces
EP0338224A2 (fr) * 1988-04-21 1989-10-25 Ford-Werke Aktiengesellschaft Dispositif de finissage des manetons de vilbrequins

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2079743A5 (fr) * 1970-02-11 1971-11-12 Spidem Ste Nle
EP0161748A2 (fr) * 1984-05-07 1985-11-21 Industrial Metal Products Corporation Appareil et procédé pour le microfinissage de surfaces
EP0338224A2 (fr) * 1988-04-21 1989-10-25 Ford-Werke Aktiengesellschaft Dispositif de finissage des manetons de vilbrequins

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332605A1 (de) * 2003-07-17 2005-02-17 Ibz Gmbh Anpressvorrichtung für eine Oberflächenbearbeitungsvorrichtung
DE10332605B4 (de) * 2003-07-17 2005-09-15 Ibz Gmbh Anpressvorrichtung für eine Oberflächenbearbeitungsvorrichtung
EP1506839A1 (fr) * 2003-08-15 2005-02-16 Supfina Grieshaber GmbH & Co. KG Outil de finition
US8517804B2 (en) 2007-10-16 2013-08-27 Nagel Maschinen- Und Werkzeugfabrik Gmbh Pressing device for cutting means and apparatus and method for finishing circumferential surfaces on cylindrical parts of a workpiece
EP2327510A1 (fr) 2009-11-25 2011-06-01 Supfina Grieshaber GmbH & Co. KG Dispositif de finition
US8408973B2 (en) 2009-11-25 2013-04-02 Supfina Grieshaber Gmbh & Co. Kg Finishing apparatus with resiliently mountable finishing belt guide
CN116587148A (zh) * 2023-07-17 2023-08-15 智龙直线(瑞金)科技有限公司 一种用于滑座球沟的抛光装置及其抛光方法
CN116587148B (zh) * 2023-07-17 2023-10-03 智龙直线(瑞金)科技有限公司 一种用于滑座球沟的抛光装置及其抛光方法

Also Published As

Publication number Publication date
EP0781627B1 (fr) 2000-03-22
DE59508072D1 (de) 2000-04-27

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