GB2143458A - Method and device for removing a coating from a workpiece - Google Patents
Method and device for removing a coating from a workpiece Download PDFInfo
- Publication number
- GB2143458A GB2143458A GB08415942A GB8415942A GB2143458A GB 2143458 A GB2143458 A GB 2143458A GB 08415942 A GB08415942 A GB 08415942A GB 8415942 A GB8415942 A GB 8415942A GB 2143458 A GB2143458 A GB 2143458A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tool
- workpiece
- removal
- brush segments
- conductive
- 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
- 238000000034 method Methods 0.000 title claims description 22
- 238000000576 coating method Methods 0.000 title claims description 19
- 239000011248 coating agent Substances 0.000 title claims description 18
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052718 tin Inorganic materials 0.000 abstract description 10
- 239000011135 tin Substances 0.000 abstract description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004411 aluminium Substances 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 239000011651 chromium Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H5/00—Combined machining
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F5/00—Electrolytic stripping of metallic layers or coatings
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The aim of the invention is the clean removal of thin cover layers on metallic workpieces with high speed and accuracy of detachment with the simultaneous removal of the material detached. Electrically conductive and electrically insulated brush segments 12, 13 respectively are disposed alternately on the operative removal surface of the tool cathode and repeatedly act on the same surface unit of the workpiece surface to be continuously treated. Abraded material is removed via ducts 17 containing filters 21. The invention applies particularly to the clean removal of thin conductive and non-conducive organic and/or inorganic protective and/or cover layers directly located on the surfaces of conductive workpieces or a conductive intermediate layer (tin, chromium, aluminium layers). <IMAGE>
Description
SPECIFICATION
A method and device for removing a coating from a workpiece
The invention relates both to a method of and a device for removing a coating from a workpiece.
It is known that protective and/or cover layers, in particular layers of tin, aluminium, chromium, zinc, etc. and their oxides, on workpiece surfaces may be removed using mechanical, electrochemical and electrical techniques. A widely used method consists in the electrical removal of cover layers. For example, the scale on steels is removed by connecting the steel workpiece into a circuit with rotary steel cleaning brushes. A critical field intensity is reached by maintaining a predetermined working gap. Heat shocks are produced by means of high voltage current pulses having a steep angle of rise and a high current density, and these shocks lead to the separation of the layer as described in East
German Patent Specification 148 600.
Mechanical methods are also known. For example scale is detached by bending the workpiece and a chromium coating can be ground away. Blasting agents may also be used for the removal of protective and/or cover layers, in particular scale.
In addition, it is known to use copper bands or rolls for the removal of thin layers of tin.
The treatment consists in that a heated copper band, which runs at a high speed, contacts with the tin layer and detaches it from the support material as a result of the high degree of wettability of the band, and itself absorbs the tin (Swiss Patent Specification 370 175).
However, the removal of tin by means of copper is very expensive in terms of materials.
Electrochemical methods have a high power consumption and have, in the case of the removal of protective and/or cover layers of black sheet, the drawback that the surface of the iron tends to corrode more rapidly and the speed of detachment is comparatively slow.
A layer of tin cannot be detached from the support material, for example, by bending or heat shocks.
The electrical removal of tin layers and like layers in accordance with the heat shock method cannot be used as the heat conductivity of the tin and like layers is much higher with respect to protective and/or cover layers of different types such as, for example, scale, and consequently high temperature gradients are not produced.
The use of milling or grinding tools for the removal of tin or aluminium layers and other tough materials is disadvantageous on account of the low service life, the blunting of the milling tool or the clogging of the grinding tool, the complicated supply procedures and the high manufacturing tolerance.
All the known methods, whether mechanical, electrical or electrochemical, do not ensure the clean removal of thin protective and/or cover layers from metal workpieces. In addition, the removal of the working gap and the treated surfaces has not been adequately resolved.
An object of the invention is to provide an improved coating removal method.
According to the invention there is provided a method of removing a coating from a workpiece, comprising treating the workpiece by means of a tool which sequentially and repeatedly applies mechanical and electrical removal forces to the coating.
The invention also provides a device for removing a coating from a workpiece, comprising a tool having an electrical conductive tool portion and an electrically non-conductive tool portion for treating the workpiece, means for causing an electric current to flow between the conductive tool portion and the workpiece, and means for causing said tool portions to treat the workpiece repetitively and sequentially to apply mechanical and electrical removal forces to the coating.
The invention accordingly provides a method and a device for the surface treatment of coated workpieces, by means of which different, superposed protective and/or cover layers of conductive workpieces or conductive intermediate layers on workpieces, consisting of thin electrically conductive and electrically non-conductive organic and/or inorganic substances which have been applied, and the material of the workpiece is detached by removal of the working gap and the treated surface.
In accordance with the invention, predetermined mechanical and electrical-electrothermal-mechanical removal forces supplied simultaneously from a tool are supplied repeatedly and alternately to the same surface unit of the workpiece surface to be continuously treated and act on this surface until there is a metallically clean separation of the protective and/or cover layers and the material of the workpiece. The method of the invention and the associated device effect a mechanical and an electrical-electrothermal-mechanical separation on the workpiece. Method steps for purely mechanical and electrical-electrothermal-mechanical separation effects are provided.
The device of the invention may consist in that series of electrically conductive brush segments and electrically insulated brush segments are disposed on the active separating surface of the tool.
By means of the device a non-conductive protective coating layer is initially destroyed and the layer disposed therebelow is heated to evaporation by thermal action as a result of the direct contact of the conductive brush segments, and the material removed from the workpiece surface is brushed away and re moved by means of the electrically insulated brush segments and discharge ducts.
The processes may be repeated several times, in accordance with the construction of the device and the method parameters used in each case, on a surface unit of the surface of the workpiece. This ensures that even very thick protective and/or cover layers, for example metal coatings or scale, may be removed in a relatively simple manner and that the separated material is removed. The separation effect may be varied by an optimum arrangement of the electrically conductive and the electrically insulated brush segments. A variation of this type may include the sequence, the segment angle, the total surface proportion, the electrically conductive or electrically insulated brush segments, the type and pairing of the material of the bristles and their thickness in the brush segments, the peripheral and the feed speed of device and the working gap between the workpiece and the tool cathode.
The surface treatment of solid and unstable flat workpieces may be carried out by means of the invention at high speed and with low manufacturing tolerances. A particularly advantageous feature is that in the case of unstable, flat and angular workpieces there is no undesirable removal of corners. This is achieved in that the sequence and the segment angle of the electrically conductive and the electrically insulated brush segments, together with the electrical conditions required for the removal, determine the synchronized work cycle of roughing, finishing, brushing and removal whilst ensuring the surface effect. Known drawbacks which arise with other solutions, are countered by means of the invention.
If workpieces are to be machined on both sides, two tool cathodes may be used. In order to enable the setting of the respective critical size of the working gap, the tool cathodes must be adjustable about an axis or a separate axis.
In the case of workpieces, whose conductive coated intermediate layer is to be surface treated, the intermediate layer forms the anode.
Preferably, the basic body of the tool cathode surrounds the brush segments in the shape of a cup. In this way it is ensured that the material removed is conveyed over the shortest possible path to the inlet apertures of the removal ducts.
Preferably, the tool cathode contains removal ducts in which filters are disposed, whose inlet apertures commence in a tangential manner outside of the tool cathode and whose discharge apertures end close to the axis of rotation.
The advantage consists in that the bristles protect against overheating which would increase wear and the material removed and the metal condensate are automatically captured with the simultaneous removal of the working gap and the treated surface.
The material removed is supplied, in this respect, to the tangential inlet apertures via the brush segments.
Further preferred features of the invention consist in different bristle materials. different bristle thicknesses and strengths for the electrically conductive and the electrically insulated brush segments.
In order that the invention may be more fully understood an embodiment thereof will now be described by way of example with reference to the accompanying drawings, wherein
Fig. 1 is an elevational view in partial section of a device for the surface treatment of coated workpieces,
Fig. 2 is a partial plan view of the tool cathode with a cup-shaped support body, shown in Figure 1, and
Fig. 3 is a partial cross-sectional view of the tool cathode.
Fig. 1 shows the device of the invention with the tool cathode in a rotatable mounting 3 on a frame 4. The tool cathode comprises a conductive shaft 9 with a slip ring 10, and a support body 14 on which is mounted a system of electrically conductive brush segments 12 and a system of electrically insulated brush segments 13. The tool cathode is supplied with an electrical current from a d.c.
source 11 via the slip ring 10. A workpiece 6 is secured to a displaceable table 5, and a working gap 7 for the surface treatment is set between the workpiece 6 and the support body 14. The size of the gap is set in accordance with the type of treatment to be performed such that the brushes 1 2,1 3 suitably contact the workpiece. The working gap 7 is set by relative movement in the direction 8 of the mounting 3 on the frame 4. The d.c.
source 11 is also connected to the workpiece 6. In use, the tool is rotated in the direction 1, such that the brush segments 12,1 3 treat the workpiece, as will be explained hereinafter.
Referring now to Figure 2, this is a partial plan view of the tool cathode showing the cup-shaped support body 14 and the brush segments 12,13. The electrically conductive brush segments 12 and the electrically insulated brush segments 13 form a continuous annular brushing track around the axis of rotation of the tool. The brush segments 12,13 are characterised by a segment angle 19 which may be adjustable. A peripheral inlet aperture 16 is provided between the support body 14 and the brush segments 1 2,13 for removal of abraded material from the workpiece 6. A removal duct 17 with an integral filter 21, communicates with the inlet aperture 16. The removal duct 17 terminates close to the axis of rotation 18 of the tool.
During rotary movement 1 of the tool cath
ode when the electrical voltage has been
switched on, the conductive brush segments
12 act on the workpiece in combination with
the electric current to produce an electrical
electrothermal-mechanical removal of a work
piece coating. More particularly there is pro
duced a melting of the protective and/or
cover layers and a partial removal of the
coating material from the workpiece 6 by the
brush segments 12. Additionally, the non
conductive brush segments 12 produce a
purely mechanical removal of the coating ma
terial. The alternate arrangement of the brush
segments 12,13 results in these removal
forces being repeatedly and sequentially ap
plied. The work cycle, consisting of roughing, finishing, brushing and removal has a duration which is a function of the size of the segment angle 19.The rotary movement 1 and the feed movement 8 of the tool cathode as well as the directions of movement of the workpiece 6 are carried out by adjustable
drives. The workpiece 6 is poled as the anode.
Fig. 3 is a cross-sectional partial view show
ing the cup-shaped support body 14. The
material 15 removed from the coated workpiece 6 is suctioned via the inlet apertures 16 and the removal duct 17 through the filter 21 in the direction of the axis of rotation 18. As a result of this there is a simultaneous removal of the heat produced in the working gap 7 during the electrical-electrothermal-mechanical removal and a cooling of the surface of the workpiece 6 and the bristles of the brush segments 1 2,1 3. The discharge apertures terminate in the vicinity of the axis of rotation
18.
A further embodiment of the invention for carrying out the method of the invention consists in the arrangement of the system of electrically conductive and electrically insulated brush segments on the periphery of the support body. The bristles are in this case located on the upstanding peripheral edge of the cup-shaped body 14 so as to extend radially outwardly with respect to the axis of rotation of the support body.
Also, the bristles of the conductive brush segments 12 and the non-conducting segments 13 may be of different materials and may be of different thicknesses and strengths.
Claims (12)
1. A method of removing a coating from a workpiece, comprising treating the workpiece by means of a tool which sequentially and repeatedly applies mechanical and electrical removal forces to the coating.
2. A method according to claim 1, wherein the electrical removal forces include electrothermal and/ or electromechanical forces.
3. A device for removing a coating from a workpiece comprising a tool having an electrical conductive tool portion and an electrically
non-conductive tool portion for treating the workpiece, means for causing an electric cur
rent to flow between the conductive tool portion and the workpiece, and means for caus
ing said tool portions to treat the workpiece repetitively and sequentially to apply mechanical and electrical removal forces to the coat
ing.
4. A device according to claim 3, wherein the tool comprises a rotary brush including conductive brush segments and non-conductive brush segments for said tool portions.
5. A method for the surface treatment of coated workpieces, wherein predetermined
mechanical, and electrical-electrothermal-mechanical, removal forces supplied simultaneously from a tool, are supplied repeatedly and alternately to the same surface unit of the workpiece surface so as to continuously treat this surface until there is a metallically clean separation of the protective and/or cover layers from the material of the workpiece.
6. A method as claimed in claim 5, wherein the speed of removal and therefore also the synchronized work cycle for removal involving roughing, finishing, brushing and removal are variable and are increased by the linking of tools.
7. A device for carrying out the method as claimed in claim 5 or 6, comprising a rotary tool forued with brushes, whose bristles are located axially and/or radially on the periphery of a rotary support body, with a voltage potential between a tool and a workpiece and with a feed and a setting movement between the tool and the workpiece, wherein systems of electrically conductive brush segments and electrically insulated brush segments are disposed on the operative removal surfaces of the tool.
8. A device as claimed in claim 7, wherein the support body surrounds the system of electrically conductive brush segments and the electrically insulated brush segments and is cup shaped.
9. A device as claimed in claim 7 or 8, wherein the tool contains removal ducts in which filters are disposed and whose inlet apertures commence at the periphery of the tool and whose discharge apertures end close to the axis of rotation of the tool.
10. A device as claimed in any of claims 7 to 9, wherein the bristles of the electrically conductive brush segments and the electrically insulated brush segments are of different materials and/or of different bristle thickness and/or strength.
11. A method of removing a coating, according to claim 1 and substantially as hereinbefore described.
12. A device for removing a coating, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD83252234A DD230811A1 (en) | 1983-06-22 | 1983-06-22 | PROCESS AND DEVICE FOR SURFACE MACHINING COATED WORKSTUECKE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8415942D0 GB8415942D0 (en) | 1984-07-25 |
| GB2143458A true GB2143458A (en) | 1985-02-13 |
| GB2143458B GB2143458B (en) | 1987-02-11 |
Family
ID=5548375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08415942A Expired GB2143458B (en) | 1983-06-22 | 1984-06-22 | Method and device for removing a coating from a workpiece |
Country Status (4)
| Country | Link |
|---|---|
| DD (1) | DD230811A1 (en) |
| DE (1) | DE3420750A1 (en) |
| GB (1) | GB2143458B (en) |
| IT (1) | IT1177809B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0516757A1 (en) * | 1990-02-23 | 1992-12-09 | Roy Gerald Gordon | Electrolytic removal of tin oxide or titanium nitride from a coater. |
| WO2011030201A1 (en) * | 2009-09-09 | 2011-03-17 | Mtu Aero Engines Gmbh | Process and device for the local removal of at least one metallic layer from a component made of an alloy |
| CN104339105A (en) * | 2013-08-05 | 2015-02-11 | 珠海格力电器股份有限公司 | Inner container edge wiping device |
| CN109088075A (en) * | 2018-08-16 | 2018-12-25 | 常州翊迈新材料科技有限公司 | A kind of automatic strip equipment of fuel battery metal double polar plate coating |
| CN109420936A (en) * | 2017-08-31 | 2019-03-05 | 深圳市水佳鑫科技有限公司 | Hard metal electrochemical milling method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4690737A (en) * | 1986-06-10 | 1987-09-01 | Cation Corporation | Electrochemical rifling of gun barrels |
| DE102005033856A1 (en) * | 2005-07-12 | 2007-01-18 | Siemens Ag | An electrode assembly and method for removing a metal-comprising layer from a workpiece surface |
| CN109420935A (en) * | 2017-08-31 | 2019-03-05 | 深圳市水佳鑫科技有限公司 | Electrochemical process for treating for stainless steel surface |
| CN110576392B (en) * | 2018-06-14 | 2021-05-14 | 蓝思科技（长沙）有限公司 | Watch cover polishing clamping device and watch cover polishing process |
| CN114226882A (en) * | 2021-12-02 | 2022-03-25 | 浙江艾格森智能制造有限公司 | Spark erosion drilling machine convenient for cleaning table top and cleaning method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB926094A (en) * | 1960-06-27 | 1963-05-15 | Stocznia Gdanska | New or improved method of cleaning metal surfaces of scale and other impurities and apparatus therefor |
| GB967571A (en) * | 1960-12-28 | 1964-08-26 | Heinz Gerd Amrhein | Improvements relating to metal-bonded grinding wheels |
| GB1088013A (en) * | 1965-02-04 | 1967-10-18 | Sandvikens Jeruverks A B | Improvements in grinding wheels |
| GB1121369A (en) * | 1964-10-07 | 1968-07-24 | Nagel Peter | Improvements in electrolytic rotary honing tools |
| GB1242234A (en) * | 1967-12-21 | 1971-08-11 | Norton Abrasives Ltd | Improvements relating to abrasive articles, particularly grinding wheels |
| GB2006080A (en) * | 1977-10-14 | 1979-05-02 | Schumag Gmbh | Device for arc cutting |
| GB2106541A (en) * | 1981-06-24 | 1983-04-13 | Ohyo Jiki Lab Co Ltd | Electrolytic and electric discharge machining of electrically non-conductive workpieces |
-
1983
- 1983-06-22 DD DD83252234A patent/DD230811A1/en not_active IP Right Cessation
-
1984
- 1984-06-04 DE DE3420750A patent/DE3420750A1/en not_active Withdrawn
- 1984-06-20 IT IT48424/84A patent/IT1177809B/en active
- 1984-06-22 GB GB08415942A patent/GB2143458B/en not_active Expired
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB926094A (en) * | 1960-06-27 | 1963-05-15 | Stocznia Gdanska | New or improved method of cleaning metal surfaces of scale and other impurities and apparatus therefor |
| GB967571A (en) * | 1960-12-28 | 1964-08-26 | Heinz Gerd Amrhein | Improvements relating to metal-bonded grinding wheels |
| GB1121369A (en) * | 1964-10-07 | 1968-07-24 | Nagel Peter | Improvements in electrolytic rotary honing tools |
| GB1088013A (en) * | 1965-02-04 | 1967-10-18 | Sandvikens Jeruverks A B | Improvements in grinding wheels |
| GB1242234A (en) * | 1967-12-21 | 1971-08-11 | Norton Abrasives Ltd | Improvements relating to abrasive articles, particularly grinding wheels |
| GB2006080A (en) * | 1977-10-14 | 1979-05-02 | Schumag Gmbh | Device for arc cutting |
| GB2106541A (en) * | 1981-06-24 | 1983-04-13 | Ohyo Jiki Lab Co Ltd | Electrolytic and electric discharge machining of electrically non-conductive workpieces |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0516757A1 (en) * | 1990-02-23 | 1992-12-09 | Roy Gerald Gordon | Electrolytic removal of tin oxide or titanium nitride from a coater. |
| EP0516757A4 (en) * | 1990-02-23 | 1993-06-30 | Roy Gerald Gordon | Electrolytic removal of tin oxide or titanium nitride from a coater |
| WO2011030201A1 (en) * | 2009-09-09 | 2011-03-17 | Mtu Aero Engines Gmbh | Process and device for the local removal of at least one metallic layer from a component made of an alloy |
| CN104339105A (en) * | 2013-08-05 | 2015-02-11 | 珠海格力电器股份有限公司 | Inner container edge wiping device |
| CN104339105B (en) * | 2013-08-05 | 2016-03-23 | 珠海格力电器股份有限公司 | Inner bag is close to device |
| CN109420936A (en) * | 2017-08-31 | 2019-03-05 | 深圳市水佳鑫科技有限公司 | Hard metal electrochemical milling method |
| CN109088075A (en) * | 2018-08-16 | 2018-12-25 | 常州翊迈新材料科技有限公司 | A kind of automatic strip equipment of fuel battery metal double polar plate coating |
| CN109088075B (en) * | 2018-08-16 | 2024-01-30 | 常州翊迈新材料科技有限公司 | Automatic deplating equipment for fuel cell metal bipolar plate coating |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8448424A0 (en) | 1984-06-20 |
| GB8415942D0 (en) | 1984-07-25 |
| DE3420750A1 (en) | 1985-01-03 |
| IT1177809B (en) | 1987-08-26 |
| DD230811A1 (en) | 1985-12-11 |
| GB2143458B (en) | 1987-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |