EP3571010A1 - Schleifroboter zum schleifen elektrisch leitfähiger werkstücke und verfahren zum betrieb eines solchen - Google Patents
Schleifroboter zum schleifen elektrisch leitfähiger werkstücke und verfahren zum betrieb eines solchenInfo
- Publication number
- EP3571010A1 EP3571010A1 EP17822173.5A EP17822173A EP3571010A1 EP 3571010 A1 EP3571010 A1 EP 3571010A1 EP 17822173 A EP17822173 A EP 17822173A EP 3571010 A1 EP3571010 A1 EP 3571010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- measuring
- transmission unit
- workpiece
- robot according
- 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
- B24B27/00—Other grinding machines or devices
- B24B27/0038—Other grinding machines or devices with the grinding tool mounted at the end of a set of bars
-
- 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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
-
- 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
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/002—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using electric current
-
- 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
- B24B41/002—Grinding heads
-
- 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
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings 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
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/14—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding turbine blades, propeller blades or the like
-
- 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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
- B24B49/183—Wear compensation without the presence of dressing tools
Definitions
- the present invention relates to a grinding robot for grinding electrically conductive workpieces and a method for operating such a grinding robot.
- the measurement of the sizes mentioned turns out to be difficult in practice.
- the abrasive body wears off during operation. In the known grinding robots this is ignored, which reduces the accuracy of the grinding result.
- the inventors have set themselves the task of specifying a grinding robot for grinding electrically conductive workpieces, in which the control of the grinding process can be carried out in normal operation solely by the measurement of electrical variables. In addition, the accuracy of the grinding result should be increased.
- a grinding robot uses a grinding wheel to apply material to the surface of a workpiece For example, in order to mold the hydraulic contour of the blades on cast blades of an impeller for a hydraulic machine. In order to avoid a time-consuming approach procedure, it is necessary for the grinding robot to know when the abrasive body is in contact with the workpiece. In addition, since a grinding wheel wears during operation, reducing the diameter of the head, a grinding robot would always need to know the current head diameter so that it can produce the desired contour of the workpiece within tolerances. In conventional grinding wheels, the current head diameter during operation can only be estimated, for example, over the respective operating time. However, such an estimate is too inaccurate for the close tolerances of the above-mentioned hydraulic contours.
- FIG. 1 grinding robot according to the invention
- Figure 2 abrasive article for use in a invention
- FIG. 3 Abrasive bodies for use in a device according to the invention
- Figure 4 abrasive article for use in a invention
- FIG. 1 shows a grinding robot according to the invention in a very highly schematic form.
- the grinding robot according to the invention is suitable for automated grinding of a conductive workpiece, which is denoted by 6.
- the grinding robot has an abrasive body, which is denoted by 5.
- the grinding body 5 comprises a rotationally symmetrical head, which is denoted by 1, a tool holder, which is denoted by 3, and a measuring and transmission unit, which is denoted by 2.
- the grinding robot further comprises a unit for actuating the grinding wheel 5, which are designated by 7.
- the operation of the grinding wheel 5 comprises on the one hand the holder and rotation of the grinding wheel 5 by means of the tool holder 3.
- the unit 7 for actuating the grinding wheel 5 may comprise, for example, a robot arm.
- the grinding robot 8 further comprises a controller, which is designated by 8.
- the controller 8 is connected to the unit 7 for operating the abrasive body 5 and controls the same, using data generated by the measuring and transmission unit 2 and transmitted to the controller.
- FIG. 2 shows an abrasive body 5 for use in a grinding robot according to the invention in a first embodiment along the axis of rotation.
- the rotationally symmetric head with 1 and the tool holder are designated 3.
- the grinding wheel rotates about the tool holder 3.
- the grinding wheel 5 further comprises a measuring and transmission unit, which is designated by 2.
- the measuring and transmission unit 2 is equipped with an independent power supply, which, for example, a battery or a Supercapacitor includes (not shown).
- an independent power supply which, for example, a battery or a Supercapacitor includes (not shown).
- the rotationally symmetrical head 1 at least 2 conductor strands are embedded, two of which are exemplified by 10 and 11.
- the conductor strands extend from the outer surface of the rotationally symmetrical head 1, which is in contact with the workpiece 6 during operation, into the interior of the head 1, where they are electrically connected to the measuring and transmission unit 2.
- the conductor strands are electrically isolated from each other, which can be achieved either by a spacing of the conductor strands with each other or by an electrical insulation thereof.
- FIG. 3 shows the same embodiment of the grinding wheel 5 as in FIG. 1 in a section transverse to the axis of rotation with the same designations. It can be seen that the conductor strands 10 and 11 in this representation are behind one another and extend radially from the cylindrical outer surface of the head 1 into the interior thereof.
- the grinding body 5 from FIGS. 2 and 3 is designed so that the cylindrical outer surface of the head 1 is in contact with the electrically conductive workpiece 6 during operation.
- an electrical connection between the strands of a conductor strand pair 10 and 11 is produced during operation by the contact of the conductive workpiece 6, so that a circuit is formed, which of the measuring and transmission unit 2 via the conductor strand 10, the Workpiece 6 and the conductor strand 11 back to the measuring and transmission unit 2 runs (or vice versa).
- This circuit is used by the measuring and transmission unit 2 for a resistance measurement.
- the conductor strands are designed so that the measured resistance is dominated by the resistance of the conductor strands.
- the measured resistance is a reciprocal proportional measure of the degree of wear of the grinding wheel 5.
- the measuring and transmission unit 2 is designed to transmit the measured resistance values and thus the degree of wear to the controller 8.
- the transmission can be done for example via Bluetooth.
- the signals received by the controller 8 are used to control the grinding process to produce the desired contour of the workpiece.
- the measuring and transmission unit 2 transmits no resistance value to the controller 8. Instead, the measuring and transmission unit can transmit a different signal to the controller 8. This signal or the absence of a resistance signal is used by the controller 8 for the procedure to approach the abrasive body 5 to the workpiece 6.
- the arrangement of the conductor strands 10, 11 shown in FIGS. 2 and 3 is only one of many possible arrangements.
- the radial profile is particularly simple and thus advantageous for the production of an abrasive article 5 for use in a grinding robot according to the invention.
- the conductor strands in Figure 3 could also extend spirally inward or not perpendicular to the cylindrical surface in Figure 2, but extend obliquely or curved.
- the conductor strand length is continuously shortened with the expected wear of the head 1, so that the decrease in the conductor strand length represents a continuous measure of the degree of wear and thus the measured resistance is inversely proportional to the degree of wear.
- FIG. 3 shows a plurality of conductor strand pairs 10, 11.
- the grinding wheel rotates very fast during operation, much less such pairs are sufficient for periodic resistance measurement, as each pair always again passes the electrically conductive workpiece.
- the use of too many pairs of conductor strands 10, 11 on the contrary may be unfavorable, since then may be more than one pair of conductors in contact with the workpiece at a time (if, for example the surface of the workpiece 6 is correspondingly curved), which has the consequence that several circuits are closed simultaneously.
- a suitably designed measuring and transmission device 2 can take this problem into account by recognizing and correspondingly taking into account such states, or most simply by using a smaller number of conductor strand pairs 10, 11.
- FIG. 4 shows an abrasive body 5 for use in a grinding robot according to the invention in a second embodiment in a section along the axis of rotation with the same designations as in FIGS. 1, 2 and 3.
- the grinding body 5 shown in FIG. 4 has a rotationally symmetrical head 1, which has a spherical shape has. Since such a head 1 is rather selectively in contact with the workpiece during operation, the conductor strand pairs 10, 11 must open much closer to the surface of the head 1 and extend in the expected wear region of the head 1 close to one another. Therefore, in Figure 4, the conductor strand pairs 10, 11 are each represented by a single line. It is clear that this arrangement usually makes it necessary that the conductor strands 10 are performed by the conductor strands 11 electrically isolated.
- One way to achieve this is to use mutually insulated coaxial conductor strands, ie one of the conductor strands 10 or 11 surrounds the other tubular, with a suitable insulating material between the inner and outer conductor.
- the two strands 10 and 11 can also run parallel with there being between the same insulation material.
- conductor strand pairs 10, 11 are provided, which open in different wear areas of the surface of the head 1, and that the measuring and transmission unit 2 can distinguish between these pairs 10, 11.
- the controller 8 can also be informed of such anisotropic wear.
- the embodiment according to the invention from FIG. 4 also comprises an optional device for measuring any bending of the tool holder 3 that may occur.
- a device may be advantageous if a disturbance in the electrical contact between the workpiece and the conductor strands 10, 11 should occur during operation.
- the controller 8 permanently receives the feedback from the measuring and transmission unit 2 that there is no closed circuit and therefore no resistance measurement can take place. Since a present resistance signal, the controller 8 also informs about the present contact of the abrasive body with the workpiece, the controller 8 would assume that there is no contact and would therefore try to approximate the grinding wheel 5 to the workpiece 6. As a result, the pressure on the grinding wheel 5 would be increased, which already rests on the workpiece. This would lead to excessive bending of the tool holder 3.
- the device for measuring the bending of the tool holder 3 from FIG. 4 additionally comprises a disk which is located on the tool holder 3 and is denoted by 4. Between disc 4 and the measuring and Transmission unit 2 is a suitable distance, and the measuring and transmission unit 2 has suitable sensors that can measure this distance distributed at several points over the circumference of the disc. The measuring and transmission unit 2 also transmits these measured values to the controller 8. If the tool holder 3 bends only slightly, this leads to one or more of the measured distances changing.
- the measurement of the distance between the disk 4 and the measuring and transmission unit 2 can be done for example by means of optical, mechanical, capacitive or inductive sensors.
- the arrangement of the conductor strand pairs 10, 11 and their evaluation in the measuring and transmission unit 2 must be adapted to the geometry of the rotationally symmetric head 1 and the expected wear of the same.
- the geometries for the rotationally symmetric head 1 are all common geometries (for example, cones, half-rounded cylinders, etc.).
- FIG. 5 shows a method for operating a grinding robot according to the invention.
- the method comprises two process steps, designated VI and V2.
- step VI the abrasive body 5 is brought closer to the workpiece 6 until the abrasive body 5 is in contact with the workpiece.
- the measuring and transmission unit 2 supplies while a signal to the controller 8, which states that no circuit is closed via a conductor strand pair, as long as there is no contact between the grinding wheel 5 and 6 workpiece. As soon as there is contact, at least one circuit is closed via a pair of conductor strands, thereby enabling a resistance measurement.
- the measuring and transmission unit 2 transmits the measured resistance values to the controller 8, whereupon it terminates the approaching step VI.
- the measuring and transmission unit 2 can also transmit no signal as long as there is no contact.
- the approaching step VI is terminated by the controller 8 as soon as the measuring and transmission unit 2 has transmitted a measured resistance value to the controller 8.
- the measuring and transmission unit 2 permanently transmits the measured resistance values to the controller 8, which takes into account these values in the decision whether the desired surface contour is reached or not. This is made possible by the fact that, as described above, the measured resistance values contain the information about the current degree of wear of the grinding head 1.
- the permanent transmission of the measured resistance values can also take place periodically, ie the measuring and transmission unit 2 transmits a resistance value whenever a predefined constant time interval has elapsed.
- the period is determined in advance according to the expected wear per unit time and the required surface accuracy. The tighter the surface tolerance, the shorter the period must be selected.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (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 |
---|---|---|---|
DE102017101175 | 2017-01-23 | ||
PCT/EP2017/081302 WO2018133984A1 (de) | 2017-01-23 | 2017-12-04 | Schleifroboter zum schleifen elektrisch leitfähiger werkstücke und verfahren zum betrieb eines solchen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3571010A1 true EP3571010A1 (de) | 2019-11-27 |
EP3571010B1 EP3571010B1 (de) | 2020-07-01 |
Family
ID=60857021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17822173.5A Active EP3571010B1 (de) | 2017-01-23 | 2017-12-04 | Schleifroboter zum schleifen elektrisch leitfähiger werkstücke und verfahren zum betrieb eines solchen |
Country Status (4)
Country | Link |
---|---|
US (1) | US11772233B2 (de) |
EP (1) | EP3571010B1 (de) |
CN (1) | CN110177648B (de) |
WO (1) | WO2018133984A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114473806B (zh) * | 2022-01-19 | 2023-11-17 | 庚显表面处理(江门)有限公司 | 一种带有补偿功能的抛光设备 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2947121A (en) * | 1959-03-25 | 1960-08-02 | Norton Co | Grinding wheel and wheel diameter measuring apparatus |
US4137516A (en) | 1977-10-31 | 1979-01-30 | Carnegie-Mellon University | Grinding wheel crack detector |
JPS5929391B2 (ja) | 1979-09-18 | 1984-07-20 | 株式会社井上ジャパックス研究所 | 砥石車 |
US5126645A (en) | 1989-09-30 | 1992-06-30 | Kabushiki Kaisha Toshiba | Grinder robot |
JP2765166B2 (ja) * | 1990-03-12 | 1998-06-11 | 三菱マテリアル株式会社 | 磨耗検出機構付き砥石および砥石の磨耗検出方法 |
JPH1034541A (ja) * | 1996-07-19 | 1998-02-10 | Toshiba Corp | 砥石およびこれを用いた研削盤、工作用ロボット |
DE19910758A1 (de) * | 1999-03-11 | 2000-09-14 | Deere & Co | Schleifvorrichtung |
JP5080933B2 (ja) * | 2007-10-18 | 2012-11-21 | 株式会社荏原製作所 | 研磨監視方法および研磨装置 |
CN103056759B (zh) * | 2012-12-24 | 2015-01-28 | 中国科学院自动化研究所 | 一种基于传感器反馈的机器人磨削系统 |
DE102013113202B4 (de) | 2013-11-28 | 2016-12-08 | Rhodius Schleifwerkzeuge Gmbh & Co. Kg | Anordnung mit einer handgeführten Werkzeugmaschine und einer Schleifscheibe; Verfahren zum Steuern der Drehzahl einer handgeführten Werkzeugmaschine sowie Verwendung dieses Verfahrens und dieser Anordnung |
CN203901108U (zh) * | 2014-05-28 | 2014-10-29 | 成都飞机工业(集团)有限责任公司 | 普通磨床砂轮恒线速运转自动控制装置 |
EP3482876A1 (de) * | 2017-11-10 | 2019-05-15 | HILTI Aktiengesellschaft | Abrasive scheibe, handwerkzeugmaschine und steuerungsverfahren |
CA3108094C (en) * | 2018-08-02 | 2023-11-07 | Saint-Gobain Abrasives, Inc. | Abrasive article including a wear detection sensor |
-
2017
- 2017-12-04 EP EP17822173.5A patent/EP3571010B1/de active Active
- 2017-12-04 CN CN201780083471.5A patent/CN110177648B/zh active Active
- 2017-12-04 WO PCT/EP2017/081302 patent/WO2018133984A1/de active Application Filing
-
2019
- 2019-07-23 US US16/519,992 patent/US11772233B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2018133984A1 (de) | 2018-07-26 |
CN110177648B (zh) | 2021-05-28 |
US11772233B2 (en) | 2023-10-03 |
BR112019010965A2 (pt) | 2019-10-01 |
US20190344400A1 (en) | 2019-11-14 |
CN110177648A (zh) | 2019-08-27 |
EP3571010B1 (de) | 2020-07-01 |
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