US20060234606A1 - Device and method for surface machining a workpiece - Google Patents
Device and method for surface machining a workpiece Download PDFInfo
- Publication number
- US20060234606A1 US20060234606A1 US10/547,829 US54782906A US2006234606A1 US 20060234606 A1 US20060234606 A1 US 20060234606A1 US 54782906 A US54782906 A US 54782906A US 2006234606 A1 US2006234606 A1 US 2006234606A1
- Authority
- US
- United States
- Prior art keywords
- abrasive
- workpiece
- machined
- pressure
- relative
- 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.)
- Abandoned
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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
- 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
- B24B31/10—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 other means for tumbling of work
- B24B31/116—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 other means for tumbling of work using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure
Definitions
- the present invention relates to an apparatus for surface machining a workpiece.
- the invention further relates to a method for surface machining a workpiece.
- Chip removal processes use the mechanical action of cutters on the workpiece and thereby cause material to be removed from the workpiece surface being machined.
- Nontraditional material removal processes use chemical or thermal processes for the surface treatment.
- the chip removal processes include so-called lapping.
- the cutter used in lapping is an abrasive that consists of abrasive grains and a carrier medium.
- lapping the surface of the workpiece to be machined is treated by means of the abrasive grains loosely distributed in the carrier medium, such that the abrasive grains are guided in random cutting paths relative to the workpiece to be machined.
- a special form of lapping is abrasive flow machining or AFM.
- abrasive flow machining the workpiece to be machined is usually clamped between two opposite, vertically disposed pressure pistons or pressure cylinders.
- the abrasive is pushed back and forth between the two pressure pistons or pressure cylinders by lifting and lowering the pressure pistons and is thereby guided past the workpiece surface to be machined.
- the removal of material from the surface being machined is determined by various process parameters, such as the pressure of the abrasive, temperature of the abrasive and viscosity or flow behavior of the abrasive. The greatest removal of material occurs in the region with the highest flow resistance.
- the present invention relates to abrasive flow machining.
- the prior art methods for surface machining a workpiece relating to abrasive flow machining has the drawback that the work results that can be achieved are inconsistent. This is due, in particular, to the large number and inconsistency of the process parameters responsible for the removal of material. Particularly if the workpiece to be machined has curved surfaces, there are substantial differences in the removal of material along the surfaces being machined, depending on whether the surface is facing toward or away from the flow direction or moving direction of the abrasive. Further irregularities in the removal of material according to the prior art result because the abrasive becomes hot with increasing machining time and the viscosity or flow rate of the abrasive changes as a result.
- the apparatus has at least two opposite pressure devices, such that the workpiece to be machined is arranged between the opposite pressure devices and an abrasive can be moved past the workpiece to be machined.
- the opposite pressure devices are pressurized with a defined pressure, such that a uniform pressure is established in the entire abrasive on every side of the workpiece to be machined.
- the movement of the abrasive relative to the workpiece to be machined can be adjusted by a movement of the opposite pressure devices in the same direction while maintaining the uniform pressure in the abrasive.
- the uniform pressure on all sides of the workpiece to be machined causes a uniform removal of material on all sides of the workpiece. The machining of the surface is thereby improved.
- the apparatus has two opposite pressure devices, between which the workpiece is clamped by means of a mechanism.
- the first, upper pressure device is mounted to a first horizontally extending cross member and another, lower pressure device to a second horizontally extending cross member.
- the two cross members are interconnected.
- the two pressure devices can be displaced relative to the mechanism by a vertical movement of the two cross members. This vertical movement of the two cross members can be used to adjust the movement of the abrasive relative to the workpiece to be machined.
- the or each cross member is a controllable drive unit for ensuring a uniform flow rate of the abrasive relative to the workpiece to be machined.
- a controllable drive unit for ensuring a uniform flow rate of the abrasive relative to the workpiece to be machined.
- a controllable cooling and/or heating device for the abrasive is provided to ensure a uniform temperature of the abrasive.
- the surface machining result can be further improved.
- FIG. 1 is a highly schematic representation of an apparatus for surface machining a workpiece according to the prior art
- FIG. 2 is a highly schematic representation of the apparatus for surface machining a workpiece according to the invention.
- FIG. 3 is an enlarged detail of the arrangement shown in FIG. 2 with additional guide elements.
- FIG. 1 shows a highly schematic representation of the apparatus 10 for abrasive flow machining according to the prior art.
- two pressure cylinders 11 , 12 are disposed vertically one above the other.
- a workpiece 13 to be machined is clamped between these two pressure cylinders 11 , 12 .
- the workpiece 13 has a borehole, the inner surface of which is to be machined.
- an abrasive 14 is pushed back and forth between the pressure cylinders 11 , 12 , which are arranged vertically one above the other. The movement of the abrasive 14 is effected by the pressure pistons 15 , 16 associated with the pressure cylinders 11 , 12 .
- FIG. 2 shows an apparatus 17 for abrasive flow machining according to the invention.
- the inventive apparatus 17 has two opposite pressure devices 18 , 19 , i.e., a first upper pressure device 18 and a second lower pressure device 19 .
- the two pressure devices 18 , 19 are designed as cylinder-piston systems.
- a workpiece to be machined 21 is positioned and clamped between the two pressure devices 18 , 19 by means of a mechanism 20 .
- the workpiece 21 is a gas turbine assembly.
- FIG. 2 shows three blades 22 of this gas turbine assembly.
- the first upper pressure device 18 is connected to a first horizontally extending cross member 23 .
- the second lower pressure device 19 is connected to a second, likewise horizontally extending cross member 24 .
- the two horizontally extending cross members 23 , 24 are interconnected at opposite ends by vertically extending supports 25 , 26 .
- the two pressure devices 18 , 19 can be pressurized with a defined pressure, such that a uniform pressure is established in the entire abrasive and thus on every side of the workpiece to be machined 21 or the blades to be machined 22 .
- the movement of the abrasive 27 in relation to the workpiece to be machined 21 , or the blades to be machined 22 can be adjusted while maintaining the uniform pressure of the abrasive. This makes it possible to achieve a uniform removal of material along the surfaces of the workpiece 21 , even if the surfaces of the workpiece to be machined 21 are curved.
- the cross members 23 , 24 and the supports 25 , 26 are associated with a controllable drive unit.
- the drive unit is used to realize the movement of the unit which consists of the cross members 23 and 24 , the supports 25 and 26 and the pressure devices 18 and 19 connected to the cross members 23 , 24 relative to the mechanism 20 .
- This controllable drive unit makes it possible to adjust a uniform flow rate of the abrasive 27 relative to the workpiece to be machined 21 .
- a further characteristic of the invention is that the apparatus 17 has a controllable cooling and/or heating device (not depicted) for the abrasive 27 .
- This cooling and/or heating device for the abrasive 27 is used to adjust a uniform temperature for the abrasive 27 .
- the apparatus according to the invention thus makes it possible to uniformly adjust or control the process parameters to a constant value, i.e., the pressure of the abrasive, the flow rate of the abrasive and the temperature of the abrasive. This in turn makes it possible for the first time to obtain reproducible surface machining results using the so-called abrasive flow machining technique.
- the uniform pressure of the abrasive ensures uniform machining of every point of the workpiece surface to be machined, even if the surfaces of the workpiece are curved.
- FIG. 3 shows a further refinement of the invention.
- guide elements 28 are disposed in the region of the workpiece to be machined 21 , or the blades to be machined 22 . These guide elements 28 are used to influence both the moving direction and the flow rate of the abrasive 27 . This makes it possible to locally influence the removal of material along the surface to be machined.
- the method according to the invention is carried out using the apparatus according to the invention as described with reference to FIG. 2 and 3 .
- the abrasive 27 is guided past the workpiece to be machined 21 , such that a uniform pressure is established in the entire abrasive 27 and thus relative to every side of the workpiece to be machined 21 .
- the abrasive 27 is moved in relation to the workpiece to be machined 21 while maintaining this uniform pressure.
- the flow rate and temperature of the abrasive can be controlled to constant values.
- the guide elements 28 are used to influence a moving direction and/or the flow rate of the abrasive.
- the apparatus and method according to the invention are particularly suitable to surface machine complex three-dimensional geometries, particularly to machine blisks of a gas turbine.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
- This application claims the priority of International Application No. PCT/DE2004/000106, filed Jan. 24, 2004, and German Patent Document No. 103 09 456.3, filed Mar. 5, 2003, the disclosures of which are expressly incorporated by reference herein.
- The present invention relates to an apparatus for surface machining a workpiece. The invention further relates to a method for surface machining a workpiece.
- In the surface treatment of workpieces a distinction is drawn between chip removal processes and nontraditional material removal processes. Chip removal processes use the mechanical action of cutters on the workpiece and thereby cause material to be removed from the workpiece surface being machined. Nontraditional material removal processes use chemical or thermal processes for the surface treatment.
- The chip removal processes include so-called lapping. The cutter used in lapping is an abrasive that consists of abrasive grains and a carrier medium. In lapping, the surface of the workpiece to be machined is treated by means of the abrasive grains loosely distributed in the carrier medium, such that the abrasive grains are guided in random cutting paths relative to the workpiece to be machined.
- A special form of lapping is abrasive flow machining or AFM. In abrasive flow machining the workpiece to be machined is usually clamped between two opposite, vertically disposed pressure pistons or pressure cylinders. The abrasive is pushed back and forth between the two pressure pistons or pressure cylinders by lifting and lowering the pressure pistons and is thereby guided past the workpiece surface to be machined. The removal of material from the surface being machined is determined by various process parameters, such as the pressure of the abrasive, temperature of the abrasive and viscosity or flow behavior of the abrasive. The greatest removal of material occurs in the region with the highest flow resistance. The present invention relates to abrasive flow machining.
- The prior art methods for surface machining a workpiece relating to abrasive flow machining has the drawback that the work results that can be achieved are inconsistent. This is due, in particular, to the large number and inconsistency of the process parameters responsible for the removal of material. Particularly if the workpiece to be machined has curved surfaces, there are substantial differences in the removal of material along the surfaces being machined, depending on whether the surface is facing toward or away from the flow direction or moving direction of the abrasive. Further irregularities in the removal of material according to the prior art result because the abrasive becomes hot with increasing machining time and the viscosity or flow rate of the abrasive changes as a result.
- Based thereon, it is an object of the present invention to provide a novel apparatus for surface machining a workpiece and a corresponding method.
- The apparatus has at least two opposite pressure devices, such that the workpiece to be machined is arranged between the opposite pressure devices and an abrasive can be moved past the workpiece to be machined. According to the invention, the opposite pressure devices are pressurized with a defined pressure, such that a uniform pressure is established in the entire abrasive on every side of the workpiece to be machined. The movement of the abrasive relative to the workpiece to be machined can be adjusted by a movement of the opposite pressure devices in the same direction while maintaining the uniform pressure in the abrasive. The uniform pressure on all sides of the workpiece to be machined causes a uniform removal of material on all sides of the workpiece. The machining of the surface is thereby improved.
- According to an advantageous further refinement of the invention, the apparatus has two opposite pressure devices, between which the workpiece is clamped by means of a mechanism. The first, upper pressure device is mounted to a first horizontally extending cross member and another, lower pressure device to a second horizontally extending cross member. The two cross members are interconnected. The two pressure devices can be displaced relative to the mechanism by a vertical movement of the two cross members. This vertical movement of the two cross members can be used to adjust the movement of the abrasive relative to the workpiece to be machined.
- Preferably, the or each cross member is a controllable drive unit for ensuring a uniform flow rate of the abrasive relative to the workpiece to be machined. By maintaining a constant flow rate of the abrasive, it is possible to improve the surface machining result.
- According to another advantageous further refinement of the invention, a controllable cooling and/or heating device for the abrasive is provided to ensure a uniform temperature of the abrasive. By maintaining a constant temperature of the abrasive, the surface machining result can be further improved.
- Exemplary embodiments of the invention, which shall not be construed as a limitation thereof, will now be described with reference to the drawings, in which:
-
FIG. 1 : is a highly schematic representation of an apparatus for surface machining a workpiece according to the prior art, -
FIG. 2 : is a highly schematic representation of the apparatus for surface machining a workpiece according to the invention, and -
FIG. 3 : is an enlarged detail of the arrangement shown inFIG. 2 with additional guide elements. -
FIG. 1 shows a highly schematic representation of theapparatus 10 for abrasive flow machining according to the prior art. In theprior art apparatus 10, twopressure cylinders 11, 12 are disposed vertically one above the other. Aworkpiece 13 to be machined is clamped between these twopressure cylinders 11, 12. In the arrangement depicted inFIG. 1 , theworkpiece 13 has a borehole, the inner surface of which is to be machined. To this end, an abrasive 14 is pushed back and forth between thepressure cylinders 11, 12, which are arranged vertically one above the other. The movement of theabrasive 14 is effected by thepressure pistons pressure cylinders 11, 12. -
FIG. 2 shows anapparatus 17 for abrasive flow machining according to the invention. Theinventive apparatus 17 has twoopposite pressure devices upper pressure device 18 and a secondlower pressure device 19. The twopressure devices - A workpiece to be machined 21 is positioned and clamped between the two
pressure devices mechanism 20. In the exemplary embodiment shown inFIG. 2 , theworkpiece 21 is a gas turbine assembly.FIG. 2 shows threeblades 22 of this gas turbine assembly. - According to
FIG. 2 , the firstupper pressure device 18 is connected to a first horizontally extendingcross member 23. The secondlower pressure device 19 is connected to a second, likewise horizontally extendingcross member 24. The two horizontally extendingcross members pressure devices cross members pressure devices cross members mechanism 20, the movement of the abrasive 27 in relation to the workpiece to be machined 21, or the blades to be machined 22, can be adjusted while maintaining the uniform pressure of the abrasive. This makes it possible to achieve a uniform removal of material along the surfaces of theworkpiece 21, even if the surfaces of the workpiece to be machined 21 are curved. - The
cross members cross members pressure devices cross members mechanism 20. This controllable drive unit makes it possible to adjust a uniform flow rate of the abrasive 27 relative to the workpiece to be machined 21. - A further characteristic of the invention is that the
apparatus 17 has a controllable cooling and/or heating device (not depicted) for the abrasive 27. This cooling and/or heating device for the abrasive 27 is used to adjust a uniform temperature for the abrasive 27. - The apparatus according to the invention thus makes it possible to uniformly adjust or control the process parameters to a constant value, i.e., the pressure of the abrasive, the flow rate of the abrasive and the temperature of the abrasive. This in turn makes it possible for the first time to obtain reproducible surface machining results using the so-called abrasive flow machining technique. The uniform pressure of the abrasive ensures uniform machining of every point of the workpiece surface to be machined, even if the surfaces of the workpiece are curved.
-
FIG. 3 shows a further refinement of the invention. In the arrangement illustrated inFIG. 3 , guideelements 28 are disposed in the region of the workpiece to be machined 21, or the blades to be machined 22. These guideelements 28 are used to influence both the moving direction and the flow rate of the abrasive 27. This makes it possible to locally influence the removal of material along the surface to be machined. - The method according to the invention is carried out using the apparatus according to the invention as described with reference to
FIG. 2 and 3. In the method according to the invention, the abrasive 27 is guided past the workpiece to be machined 21, such that a uniform pressure is established in the entire abrasive 27 and thus relative to every side of the workpiece to be machined 21. The abrasive 27 is moved in relation to the workpiece to be machined 21 while maintaining this uniform pressure. The flow rate and temperature of the abrasive can be controlled to constant values. Theguide elements 28 are used to influence a moving direction and/or the flow rate of the abrasive. - The apparatus and method according to the invention are particularly suitable to surface machine complex three-dimensional geometries, particularly to machine blisks of a gas turbine.
-
apparatus 10 pressure cylinder 11 pressure cylinder 12 workpiece 13 abrasive 14 pressure piston 15 pressure piston 16 apparatus 17 pressure device 18 pressure device 19 mechanism 20 workpiece 21 blade 22 cross member 23 cross member 24 support 25 support 26 abrasive 27 guide element 28
Claims (25)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10309456.3 | 2003-03-05 | ||
DE10309456A DE10309456A1 (en) | 2003-03-05 | 2003-03-05 | Device and method for surface machining a workpiece |
PCT/DE2004/000106 WO2004078416A1 (en) | 2003-03-05 | 2004-01-24 | Device and method for surface machining a workpiece |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060234606A1 true US20060234606A1 (en) | 2006-10-19 |
Family
ID=32864120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/547,829 Abandoned US20060234606A1 (en) | 2003-03-05 | 2004-01-24 | Device and method for surface machining a workpiece |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060234606A1 (en) |
EP (1) | EP1615748A1 (en) |
DE (1) | DE10309456A1 (en) |
WO (1) | WO2004078416A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090235526A1 (en) * | 2008-03-18 | 2009-09-24 | Arno Secherling | Method for the manufacture of a welded blisk drum |
US20160160669A1 (en) * | 2013-07-10 | 2016-06-09 | United Technologies Corporation | Abrasive flow media fixture with end contour |
CN106584259A (en) * | 2016-11-24 | 2017-04-26 | 京磁材料科技股份有限公司 | Die maintaining equipment and method |
CN107877350A (en) * | 2017-11-13 | 2018-04-06 | 郑州法图曼工具磨具有限公司 | A kind of clamping device of abrasive flow machining |
EP3556484A1 (en) * | 2018-04-19 | 2019-10-23 | United Technologies Corporation | Integrated tooling for abrasive flow machining |
CN111113251A (en) * | 2019-12-27 | 2020-05-08 | 国营第六一六厂 | Flexible clamp for abrasive flow |
CN112643527A (en) * | 2020-12-01 | 2021-04-13 | 四川航天长征装备制造有限公司 | Multi-channel abrasive particle flow machining tool for deburring of cross holes of three-way part |
CN113770907A (en) * | 2021-09-22 | 2021-12-10 | 山西柴油机工业有限责任公司 | High-efficient grinder |
US20220258298A1 (en) * | 2019-07-31 | 2022-08-18 | Extrude Hone Gmbh | Abrasive Flow Machine, Method for Ascertaining Material Removal on a Workpiece, and Method for Determining the Cutting Power of a Grinding Medium |
CN115284160A (en) * | 2022-06-30 | 2022-11-04 | 江苏大学 | Reciprocating abrasive flow polishing device and method based on cavitation effect |
CN115464544A (en) * | 2022-10-06 | 2022-12-13 | 航发优材(镇江)增材制造有限公司 | Abrasive flow process method for calibrating various structures and various base materials |
CN115673998A (en) * | 2022-12-30 | 2023-02-03 | 钜亚汽车零部件科技(太仓)有限公司 | Polishing device and polishing method for special-shaped porous part |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005026511A1 (en) * | 2005-06-09 | 2006-12-14 | Robert Bosch Gmbh | Valve, in particular for use as a suction valve on the suction side of fuel injection systems |
DE102008014725A1 (en) * | 2008-03-18 | 2009-09-24 | Rolls-Royce Deutschland Ltd & Co Kg | Method for producing a welded blisk drum |
DE102019131050A1 (en) | 2019-11-18 | 2021-05-20 | AM Metals GmbH | Flow lapping device for smoothing a surface of a workpiece |
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2003
- 2003-03-05 DE DE10309456A patent/DE10309456A1/en not_active Withdrawn
-
2004
- 2004-01-24 EP EP04704984A patent/EP1615748A1/en not_active Withdrawn
- 2004-01-24 US US10/547,829 patent/US20060234606A1/en not_active Abandoned
- 2004-01-24 WO PCT/DE2004/000106 patent/WO2004078416A1/en active Search and Examination
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090235526A1 (en) * | 2008-03-18 | 2009-09-24 | Arno Secherling | Method for the manufacture of a welded blisk drum |
US20160160669A1 (en) * | 2013-07-10 | 2016-06-09 | United Technologies Corporation | Abrasive flow media fixture with end contour |
US9840926B2 (en) * | 2013-07-10 | 2017-12-12 | United Technologies Corporation | Abrasive flow media fixture with end contour |
CN106584259A (en) * | 2016-11-24 | 2017-04-26 | 京磁材料科技股份有限公司 | Die maintaining equipment and method |
CN107877350A (en) * | 2017-11-13 | 2018-04-06 | 郑州法图曼工具磨具有限公司 | A kind of clamping device of abrasive flow machining |
EP3556484A1 (en) * | 2018-04-19 | 2019-10-23 | United Technologies Corporation | Integrated tooling for abrasive flow machining |
US20220258298A1 (en) * | 2019-07-31 | 2022-08-18 | Extrude Hone Gmbh | Abrasive Flow Machine, Method for Ascertaining Material Removal on a Workpiece, and Method for Determining the Cutting Power of a Grinding Medium |
CN111113251A (en) * | 2019-12-27 | 2020-05-08 | 国营第六一六厂 | Flexible clamp for abrasive flow |
CN112643527A (en) * | 2020-12-01 | 2021-04-13 | 四川航天长征装备制造有限公司 | Multi-channel abrasive particle flow machining tool for deburring of cross holes of three-way part |
CN113770907A (en) * | 2021-09-22 | 2021-12-10 | 山西柴油机工业有限责任公司 | High-efficient grinder |
CN115284160A (en) * | 2022-06-30 | 2022-11-04 | 江苏大学 | Reciprocating abrasive flow polishing device and method based on cavitation effect |
CN115464544A (en) * | 2022-10-06 | 2022-12-13 | 航发优材(镇江)增材制造有限公司 | Abrasive flow process method for calibrating various structures and various base materials |
CN115673998A (en) * | 2022-12-30 | 2023-02-03 | 钜亚汽车零部件科技(太仓)有限公司 | Polishing device and polishing method for special-shaped porous part |
Also Published As
Publication number | Publication date |
---|---|
WO2004078416A1 (en) | 2004-09-16 |
DE10309456A1 (en) | 2004-09-16 |
EP1615748A1 (en) | 2006-01-18 |
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