EP2437917A1 - Verfahren und vorrichtung zum gleitspanen eines werkstücks - Google Patents
Verfahren und vorrichtung zum gleitspanen eines werkstücksInfo
- Publication number
- EP2437917A1 EP2437917A1 EP10722641A EP10722641A EP2437917A1 EP 2437917 A1 EP2437917 A1 EP 2437917A1 EP 10722641 A EP10722641 A EP 10722641A EP 10722641 A EP10722641 A EP 10722641A EP 2437917 A1 EP2437917 A1 EP 2437917A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpiece
- functional surface
- abrasive
- movement
- working container
- 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
Links
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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/003—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor whereby the workpieces are mounted on a holder and are immersed in the abrasive material
-
- 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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
- B24B31/0224—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels the workpieces being fitted on a support
Definitions
- the invention relates to a method and a device for sliding cutting a workpiece having at least one functional surface, in which the workpiece is guided in a working container containing abrasive particles or abrasives while exerting a relative movement to the grinding bodies or abrasives.
- the slip-pasting agents are selected, which are available in various shapes, sizes, materials, and compositions.
- abrasives and abrasive particles which can be present in the working container in an aqueous solution or suspension.
- Abrasive grains are present in a bonding system (ceramic, plastic-bonded, etc.) as a solid in abrasives abrasive abrasive grains and natural products.
- Tauchgleitspanen stands out by the fact that workpieces are not present as the bulk material together with the abrasives within the working container as in the above types of processes, but are machined without collision. This is done by a rotating carrier carousel with several, typically up to 12 rotating spindles is fitted to which individual workpieces are attached separately.
- the entire carrier carousel equipped with the workpieces attached thereto is immersed in the abrasive bath and set in rotation. Due to the kinematics, the method is also known as drag loops. Depending on the selected immersion depth of the carousel in the working container and depending on the selected
- Rotational speeds of all through the carousel and the attached spindles rotatable movements up to 40 times higher cutting performance is achieved on the workpieces as it is possible in the aforementioned vibratory finishing process.
- DE 10 2007 032 614 A1 discloses a method for drag-grinding objects whose edges and ridges are to be rounded with radii of 20 ⁇ m and smaller.
- the support carousel provided for this purpose allows the dynamic superposition of at least three circular movements, which are carried out in a certain ratio to one another.
- US 5,251,409 describes a method of finishing casings, particularly outboard motors, by drag dragging in an annular container containing abrasive.
- a central, rotatably and vertically slidably mounted ring are several workstations, each with a vertical arm on which the housing are fixed so that their axis of symmetry is substantially horizontal, ie in the towing plane.
- the housings are tilted at different angles during towing by means of a device mounted on the arm.
- EP 1 219 389 A1 relates to a method for smoothing the surface of a gas turbine blade by means of a drag-grinding process in a first and in a second medium.
- the turbine blade is smoothed under a multi-axis motion.
- the turbine blade is attached to a rotatable and vertically tiltable mount, which in turn is attached to a rotating disk.
- the turbine bucket describes a kind of planetary movement, ie during rotation around a center it still turns around itself. In addition, the holder is still tilted.
- US Pat. No. 7,048,613 B2 relates to a drag-grinding method for rotationally symmetrical workpieces, in particular car wheels, in which a particularly high-gloss surface is produced.
- the workpiece is also processed by an overlay of movements, in particular in the form of a planetary movement, in an abrasive.
- a vertical movement may be superimposed.
- the invention has for its object to provide a method and apparatus for Gleitspanen a working on at least one functional surface workpiece in which the workpiece is guided in a grinding or abrasive containing working container while exerting a relative movement to the grinding wheels or abrasives such that the In particular, at the at least one functional surface taking place Materialabtrennrind can be performed in a predefined manner, without having to operate the high cost of empirical preliminary tests.
- the aftertreatment of high-precision components in the context of a Gleitspanvorganges with improved efficiency and improved predictable accuracy with regard to the quantity of a material separation to be carried out on the workpiece surface.
- the solution of the problem underlying the invention is specified in claim 1.
- the subject of claim 9 is a device according to the solution.
- the solution according to the invention advantageously further-forming features are the subject of the dependent claims and the further description in particular with reference to the exemplary embodiments.
- the workpiece and in particular the functional surface of the workpiece to be machined with a fixed predetermined and adapted to the respective free-form surface of the functional surface trajectory by containing the grinding wheels or abrasive working container so as to ensure that the abrasive bodies or abrasives contained in the process vessel, which interact with the workpiece surface, perform a defined predetermined relative movement with respect to the direction and magnitude of the velocity vectors attributable to the abrasive bodies or abrasives.
- machining of the functional surfaces of a particular workpiece which contribute significantly to the intended use of the workpiece as well as its life and function.
- an example is a turbine blade of a flow-rotating machine whose intended function is, for example, to transmit a torque to a shaft by using a fluid flow.
- the fluid flow directly exposed pressure and suction side of the turbine blade which constitute the functional surfaces of the turbine blades in the sense described above.
- this means that the turbine bucket with its turbine bucket blade is to be moved along a predefined path of travel through the work vessel containing the abrasive article or abrasive article, such that the abrasive article or abrasive material will contact the suction and pressure surfaces of the turbine bucket in the same manner flow around as the deflected in the intended use of the turbine blade fluid flow.
- a kinematics system is required on which the workpiece to be machined is attached and which is used to execute a corresponding individual trajectory be able to.
- the kinematics system has to ensure that, by means of a corresponding synchronized kinematic coupling of different degrees of freedom of movement, the abrasive bodies or abrasives interacting with the respective functional surfaces within the working container during the entire process Postprocessing process with respect to their velocity vectors in magnitude and direction relative to the functional surface to be processed remain largely the same.
- the solution according to the invention fine machining of a workpiece having at least one functional surface, preferably by means of Gleitspanvorganges in which the workpiece is guided in a grinding or abrasive working container containing a relative movement to the abrasive particles, characterized by the solution by the following steps: First, there is a to provide the surface shape of the numerical data set describing at least one functional area. If the workpiece to be reworked has been produced in the context of a computer-controlled machine process, the 3D design data describing the surface shape of the entire workpiece are already available, which can be used as a basis for the method according to the invention.
- a trajectory curve or movement trajectory describing the relative movement of the workpiece relative to the abrasive particles in the work container taking into account a stress collective acting on the at least one functional surface in the intended use of the workpiece.
- this applies to the overflow process, in which the grinding bodies or abrasives flow over the at least one functional surface of the workpiece to be machined, at least with respect to the overflow direction to the real overflow process, in which the turbine blade is flowed around by a fluid flow, largely adapt.
- a kinematic system for example in the form of a robot or a machine tool system, which is capable of deflecting the workpiece by at least two rotational degrees of freedom of movement and by at least one translational degree of freedom of movement.
- the kinematics system has a manipulator end region, on which a fastening device is provided, on which the workpiece can be clamped.
- a control system provides for a precise control of the kinematics system for carrying out the movement trajectory adapted to the surface geometry of the at least one functional surface of the workpiece within the working container containing the grinding wheels or abrasives.
- the movement trajectory it is therefore necessary to take into account the geometric data of the workpiece to be machined, in particular the at least one functional surface with the technology data of the workpiece with respect to its intended use.
- the movement parameters ie the movement trajectory or the trajectories and the speeds with which the respective workpiece is moved along a trajectory through the working container holding the grinding bodies or abrasives.
- the solution-controlled web-controlled sliding cutting leads to a series of positive effects:
- direction-dependent processing textures can be generated on the functional surfaces of the respective workpiece without unduly changing the dimensional and dimensional accuracy of the workpiece.
- FIG. 3 illustration of a movement trajectory for a trained as a twist drill workpiece, as well
- FIG. 4 a, b, c Illustration of different angles of attack of a turbine blade. Ways to carry out the invention, industrial usability
- a knee endoprosthesis 1 is shown in two different views, which has a barrel-shaped knee joint surface 2 which performs bidirectional rolling movements within a corresponding counter-contoured socket when used as intended, see also the arrows indicated in FIG.
- the knee endoprosthesis is fixed over the shaft 3 in a corresponding joint bone area.
- the knee endoprosthesis 1 is fastened in the region of the shaft 3 to a manipulator arm of a robot (not shown), which preferably completely dips the knee endoprosthesis 1 into a working container containing the grinding wheels or abrasives and performs a bidirectional rolling movement characterized by the arrow representation.
- the abrasive particles or abrasive move along the functional surface 2 in the same manner in which the knee endoprosthesis 1 is exposed to the natural dynamic load pattern in the implanted state.
- FIG. 2 illustrates the already explained example of a turbine blade, which according to the left-hand illustration in FIG. 2 has an airfoil 4 which has a suction side 5 and a pressure side 6.
- the turbine blade 4 is immersed over the entire turbine blade length L in the grinding or abrasive containing working container and subsequently moved along the spirally formed movement trajectory 7 indicated by dashed lines in the right-hand image representation according to FIG.
- the inventive idea of the web-controlled sliding chip is based on exposing the turbine blade to be machined such that an abrasive flow of abrasive body or abrasive fluid that set fluidically constant conditions on the turbine blade surface.
- FIGS. 4a, b, c show different angles of incidence for a specific turbine blade profile.
- the basic rule is that each blade profile has a geometric angle at which it provides no buoyancy.
- the so-called zero buoyancy line is shown in Figure 4b.
- a negative angle of attack to the surrounding flow must be set, as shown in FIG. 4 a.
- this causes a negative buoyancy (output)
- an increase in pressure on the top of the profile but the dynamic pressure acting on the top can be relieved by radially dodging the turbine blade with an inward movement.
- the superposition of a circular path of the salaried profile with the radial movement results in a spiral path.
- the buoyancy or downforce on the profile cross-section represents a complex interplay of friction-laden body flow and boundary layer influences. Therefore, the calculation of velocity, streamline and pressure distribution is mainly done with simulation programs.
- the web speed, the angle of attack and the trajectory are dependent on the viscosity or abrasiveness of the grinding wheels.
- load collectives are formed in dependence of a trajectory by means of flow simulations in such a way that pressure and flow velocity are set constant along the functional surfaces.
- the integral of pressure and speed remains constant over time and place.
- the aim of a simulation is the determination of a trajectory for which the stated conditions are met. In the case of the turbine blade, the helical path is a possible solution.
- either a robot or a correspondingly designed machine tool system can be used, in which the rotation of the workpiece 4 is synchronized for rotation about a main axis of rotation M, so that the flow conditions of the grinding bodies or abrasives within the working container along the suction and pressure side of the turbine blade are largely the same.
- FIG. 3 shows the end piece of a spiral drill 8, the helically rotating flute 9 of which represents the functional surface characteristic of the twist drill 8.
- a movement trajectory for the twist drill 8 is thus a synchronized dipping movement with a workpiece rotation around the drill longitudinal axis so, so that the flute 9 undergoes a uniform flow and overflow of abrasive particles within the working container.
- an upward movement is performed with an opposite spindle rotation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009024313A DE102009024313A1 (de) | 2009-06-05 | 2009-06-05 | Verfahren und Vorrichtung zum Gleitspanen eines Werkstücks |
| PCT/EP2010/003352 WO2010139468A1 (de) | 2009-06-05 | 2010-06-02 | Verfahren und vorrichtung zum gleitspanen eines werkstücks |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP2437917A1 true EP2437917A1 (de) | 2012-04-11 |
| EP2437917B1 EP2437917B1 (de) | 2014-05-07 |
| EP2437917B8 EP2437917B8 (de) | 2014-07-23 |
Family
ID=42668822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10722641.7A Not-in-force EP2437917B8 (de) | 2009-06-05 | 2010-06-02 | Verfahren und vorrichtung zum gleitspanen eines werkstücks |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2437917B8 (de) |
| DE (1) | DE102009024313A1 (de) |
| WO (1) | WO2010139468A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011015750A1 (de) * | 2011-03-31 | 2012-10-04 | Otec Präzisionsfinish GmbH | Verfahren und Vorrichtung zur Oberflächenbearbeitung von Werkstücken |
| US10406651B2 (en) | 2016-04-01 | 2019-09-10 | Rolls-Royce Plc | Methods of vibro-treating and vibro-treating apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5251409A (en) * | 1992-06-15 | 1993-10-12 | Outboard Marine Corporation | Method of drag finishing a housing |
| DE20005361U1 (de) | 2000-03-23 | 2000-06-15 | OTEC Präzisionsfinish GmbH, 75334 Straubenhardt | Werkstückhalter für Schleppfinishmaschinen |
| EP1219389A1 (de) * | 2000-12-27 | 2002-07-03 | Siemens Aktiengesellschaft | Verfahren zur Glättung der Oberfläche einer Gasturbinenschaufel |
| DE10221842A1 (de) * | 2002-05-16 | 2003-11-27 | Roesler Oberflaechentechnik Gm | Polierverfahren |
| US7063594B1 (en) * | 2005-01-31 | 2006-06-20 | Pratt & Whitney Canada Corp. | Cutting edge honing process |
| DE102007032614A1 (de) | 2007-07-11 | 2009-01-15 | Otec Präzisionsfinish GmbH | Verfahren zum Schleifen von Gegenständen |
| DE202008014605U1 (de) * | 2008-11-04 | 2009-12-17 | Otec Präzisionsfinish GmbH | Spannvorrichtung für Werkstücke |
-
2009
- 2009-06-05 DE DE102009024313A patent/DE102009024313A1/de not_active Withdrawn
-
2010
- 2010-06-02 EP EP10722641.7A patent/EP2437917B8/de not_active Not-in-force
- 2010-06-02 WO PCT/EP2010/003352 patent/WO2010139468A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010139468A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009024313A1 (de) | 2011-01-05 |
| EP2437917B1 (de) | 2014-05-07 |
| WO2010139468A1 (de) | 2010-12-09 |
| EP2437917B8 (de) | 2014-07-23 |
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