CN113714576B - Electrode device for processing steam passage of steam turbine nozzle group - Google Patents
Electrode device for processing steam passage of steam turbine nozzle group Download PDFInfo
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- CN113714576B CN113714576B CN202111168868.9A CN202111168868A CN113714576B CN 113714576 B CN113714576 B CN 113714576B CN 202111168868 A CN202111168868 A CN 202111168868A CN 113714576 B CN113714576 B CN 113714576B
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- 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
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
- B23H3/04—Electrodes specially adapted therefor or their manufacture
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- 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
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
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Abstract
The invention relates to an electrode device for processing a steam passage of a steam turbine nozzle group, which comprises a steam inlet side electrode, a steam outlet side electrode, a clamping handle and an upright post, wherein the steam inlet side electrode is arranged on the steam outlet side of the steam inlet side electrode; the steam inlet side electrode comprises a first connecting plate and a plurality of steam inlet side processing parts, one side of the first connecting plate, which is far away from the stand column, is a flange surface, the flange surface of the first connecting plate extends in the direction far away from the stand column to form the plurality of steam inlet side processing parts, and the plurality of steam inlet side processing parts are arranged in an arc shape; the steam outlet side electrode comprises a second connecting plate and a plurality of steam outlet side processing parts, one side, far away from the stand column, of the second connecting plate is a flange face, the flange face of the second connecting plate extends towards the direction of the far away stand column to form the plurality of steam outlet side processing parts, and the plurality of steam outlet side processing parts are arranged in a circular arc shape. The electrode device for machining the steam passage of the nozzle group of the steam turbine can be used for electrolytically machining a plurality of cavities at one time, so that the machining efficiency is improved, the times of positioning and clamping the nozzle group workpiece in the electrolytic machining process are greatly reduced, and the accumulated error generated by clamping and positioning is reduced.
Description
Technical Field
The invention relates to the technical field of turbine processing, in particular to an electrode device for processing a steam passage of a turbine nozzle group.
Background
The nozzle of the steam turbine belongs to the static part of the steam turbine and is an important part of steam thermal power conversion. The nozzle steam passage is a plurality of specially designed curved cavities. After high-temperature and high-pressure steam is expanded and decompressed through a specific cavity channel, high-speed steam flow is formed and directionally sprayed onto the movable blade grids to do work, the heat energy of the primary steam is converted into kinetic energy, and efficient function conversion is achieved. The nozzle steam passage is composed of a plurality of curved surface cavities formed by a plurality of groups of blade grids radiating along the circumferential radial direction and inner and outer annular supporting bodies, and the nozzle is in a high-temperature and high-pressure extremely severe working condition environment, so that the load is complex and variable, and the nozzle steam passage is generally designed into a non-welding type integrated structure at present. For the processing of the steam passage cavity, the processing can not be realized by the conventional mechanical processing method at all, and the domestic electric spark processing is generally in a single electrode form.
Chinese patent publication No. CN205950038U discloses a novel electrode clamping tool for electric melting processing of a turbine nozzle group, which comprises a machine tool chuck, an electrode clamping handle, an electrode handle, a steam inlet side electrode and a steam outlet side electrode. The machine tool chuck is connected with the electrode clamping handle through a jackscrew, the electrode clamping handle is connected with the electrode handle through the jackscrew, and the end parts at the two sides of the electrode handle are respectively provided with a steam inlet side electrode and a steam outlet side electrode. The novel electrode clamping tool for the electric melting processing of the steam turbine nozzle group has the following problems: the steam inlet side electrode and the steam outlet side electrode are only processed with one cavity at a time, and the workpiece needs to be repositioned once when each cavity is processed, and the electrolyte medium is charged and discharged once. Because the size of the electrolytic corrosion electrode is reduced, the electrode needs to be replaced every time two cavities are machined, and one circle of nozzle has hundreds of cavities, so that the labor intensity is high, the machining efficiency is low, the accumulated error is large, the machining precision is not high, and the quality safety and the production efficiency of products are influenced to a certain degree.
Therefore, it is desirable to provide an electrode device for machining a steam passage of a nozzle assembly of a steam turbine, which can simultaneously machine a plurality of cavities.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides an electrode device for steam passage machining of a turbine nozzle set, which solves the technical problem of low efficiency of electric melting machining of the existing turbine nozzle set.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the embodiment of the invention provides an electrode device for processing a steam passage of a steam turbine nozzle group, which comprises a steam inlet side electrode, a steam outlet side electrode, a clamping handle and an upright post, wherein the upright post is fixedly connected with the middle part of the clamping handle;
the steam inlet side electrode comprises a first connecting plate and a plurality of steam inlet side processing parts, one side, close to the stand column, of the first connecting plate is installed on the clamping handle, one side, far away from the stand column, of the first connecting plate is a flange surface, the flange surface of the first connecting plate extends in the direction far away from the stand column to form the plurality of steam inlet side processing parts, and the plurality of steam inlet side processing parts are arranged in an arc shape;
go out vapour side electrode and include second connecting plate and a plurality of vapour side processing portion, the second connecting plate is close to one side of stand is installed on the centre gripping handle, the second connecting plate is kept away from one side of stand is the flange face, the flange face of second connecting plate toward keeping away from the direction of stand extends and forms a plurality of vapour side processing portions, just a plurality of vapour side processing portions are convex and arrange.
Optionally, when the steam inlet side electrode is used for machining the steam turbine nozzle group, the plurality of steam inlet side machining parts are just arrayed around the central arc of the steam turbine nozzle group;
when the steam outlet side electrode is used for processing the steam turbine nozzle group, the plurality of steam outlet side processing parts are just arranged around the center of the steam turbine nozzle group in a circular arc shape.
Optionally, the first side surface and the second side surface of the first connecting plate are cambered surfaces, two sides of the first connecting plate are reference surfaces, and the reference surfaces are perpendicular to the flange surface;
the first side face and the second side face of the second connecting plate are cambered surfaces, two sides of the second connecting plate are datum planes, and the datum planes are perpendicular to the flange planes.
Optionally, the number of the steam inlet side processed parts of the steam inlet side electrode is two, three, four or five, and the number of the steam outlet side processed parts of the steam outlet side electrode is two, three, four or five.
Optionally, the number of the steam inlet side processed parts of the steam inlet side electrode is two, and the steam inlet side processed parts comprise a first processed part and a second processed part, and the side surfaces of the first processed part and the second processed part are enveloped by a first surface arc profile, a first parting profile and a first back arc profile;
the number of the steam outlet side processing parts of the steam outlet side electrode is two, the steam outlet side processing parts comprise third processing parts and fourth processing parts, and the side surfaces of the third processing parts and the fourth processing parts are formed by enveloping second surface arc profiles, second parting surfaces and second back arc profiles;
the first back arc-shaped surface and the second back arc-shaped surface are used for processing one side surface of a cavity of the steam turbine nozzle group, and the first back arc-shaped surface and the second back arc-shaped surface are used for processing the other side surface of the cavity of the steam turbine nozzle group.
Optionally, the sum of the processing length L1 of the steam inlet side processing part and the processing length L2 of the steam outlet side processing part is greater than the width d of the blade cascade in the turbine nozzle group, and the steam inlet side processing part and the steam outlet side processing part are overlapped by 2-3mm in the turbine nozzle group.
Optionally, a processing length L1 of the steam inlet side processing part is greater than a processing length L2 of the steam outlet side processing part, so that a lap joint area of the steam inlet side processing part and the steam outlet side processing part is close to a steam outlet side of the turbine nozzle group.
Optionally, the flange surface of the first connecting plate is provided with a drain groove between the adjacent steam inlet side processing portions, and the flange surface of the second connecting plate is provided with a drain groove between the adjacent steam outlet side processing portions.
Optionally, a cylindrical electrode handle is arranged on one side, close to the column, of the first connecting plate of the steam inlet side electrode and one side, close to the column, of the second connecting plate of the steam outlet side electrode, a cylindrical surface of the electrode handle is formed into a positioning surface parallel to the reference surface through milling, and an electrode handle mounting groove is formed in the clamping handle in the axial direction and used for inserting the electrode handle.
Optionally, the electrode device further comprises a compression block and a compression screw;
an opening is formed in the side wall of the clamping handle corresponding to the positioning surface of the electrode handle, the pressing block is installed at the opening, a through hole is formed in the pressing block, a threaded hole is formed in the electrode handle corresponding to the through hole, and a pressing screw penetrates through the pressing block and the clamping handle in sequence and is screwed into the threaded hole in the electrode handle to fixedly connect the pressing block, the clamping handle and the electrode handle;
when the compression screw is not screwed down on the compression block and the electrode handle, a gap of 0.1-0.2mm is reserved between the positioning surface of the electrode handle and the compression block;
when the compression block and the electrode handle are screwed down by the compression screw, the electrode handle is tightly attached to the inner hole circular surface at the opening of the clamping handle under the action of bolt pre-tightening force.
(III) advantageous effects
The beneficial effects of the invention are: compared with the prior art, the electrode device for machining the steam passage of the steam turbine nozzle set can be used for electrolytically machining a plurality of cavities at one time, improves the machining efficiency, greatly reduces the times of positioning and clamping a nozzle set workpiece in the electrolytic machining process, reduces the accumulated error generated by clamping and positioning, and improves the size machining precision of a steam turbine nozzle set product. The method can greatly reduce the labor operation intensity of operators, solves the problems of high labor intensity and low processing efficiency in the processing process, avoids the frequency of frequently charging and discharging the electrolyte, improves the operation environment condition to a certain extent, and improves the safety and the reliability of the steam turbine nozzle group product manufacturing process.
Drawings
FIG. 1 is a perspective view of an embodiment 1 of the electrode assembly for steam path machining of a steam turbine nozzle block of the present invention;
FIG. 2 is a schematic front view of an embodiment 1 of the electrode assembly of the present invention for use in the steam path machining of a steam turbine nozzle block;
FIG. 3 is a schematic rear view of an embodiment 1 of the electrode assembly for steam path machining of a steam turbine nozzle block of the present invention;
FIG. 4 is a schematic perspective view of the steam inlet side electrode of FIG. 1;
FIG. 5 is a schematic perspective view of the vapor outlet side electrode of FIG. 1;
FIG. 6 is a perspective view of a turbine nozzle block having a plurality of cascades therein, the cascades being arranged in a circular pattern around the center of the turbine nozzle block and a cavity being formed between adjacent cascades for use as turbine nozzles;
FIG. 7 is a schematic structural view of the steam inlet side electrode, the steam outlet side electrode and the turbine nozzle block of the present invention, wherein the turbine nozzle block is not electrolytically machined;
FIG. 8 is a schematic view of the internal structure of the steam inlet side electrode machining turbine nozzle block of FIG. 1;
FIG. 9 is a schematic view of the internal structure of the steam outlet side electrode machining turbine nozzle block of FIG. 1;
FIG. 10 is a schematic view of the internal structure of a turbine nozzle block after machining; only a first blade row, a second blade row and a third blade row are shown, a first cavity is formed between the first blade row and the second blade row, and a second cavity is formed between the second blade row and the third blade row;
FIG. 11 is another schematic rear view of embodiment 1 of the electrode assembly for steam passage machining of a nozzle block of a steam turbine according to the present invention, in which the clamping shank, the pressing block and the pressing screw are shown, and the steam outlet side electrode and the electrode shank are not inserted into the electrode shank mounting groove of the clamping shank;
FIG. 12 is a schematic cross-sectional view of the electrode assembly of the present invention at the connection of the clamping shank and the electrode shank with the compression screw not tightened and with a 0.1-0.2mm gap between the locating surface of the electrode shank and the compression block;
FIG. 13 is another schematic sectional view of the electrode assembly of the present invention at the connection between the clamping handle and the electrode handle, wherein the clamping block and the electrode handle are tightened by the clamping screw, and the inner hole circular surfaces at the opening of the clamping handle and the electrode handle are tightly attached by the pre-tightening force of the screw.
[ instruction of reference ]
1: a vapor inlet side electrode; 2: a vapor outlet side electrode; 3: a clamping handle; 4: a compression block; 5: a compression screw; 6: a column; 7: a first processing section; 8: a second processing section; 9: a third processing section; 10: a fourth processing section; 11: a first connecting plate; 12: an electrode handle; 13: a reference plane; 14: a flange face; 15: a flood discharge groove; 16: a first face arc profile; 17: a first back arc profile; 18: a second back arc profile; 19: a second face arc profile; 20: a turbine nozzle group; 21: a first cascade; 22: a second cascade; 23: a third cascade; 24: a first cavity; 25: a second cavity; 26: a first parting surface; 27: a second parting plane; 28: a second connecting plate.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. As used herein, the directional designations "upper", "lower", "left", "right", "front", "back", etc. refer to the orientation of FIG. 1.
Example 1:
referring to fig. 1 and 6, the present embodiment provides an electrode assembly for steam passage processing of a steam turbine nozzle set, which includes a steam inlet side electrode 1, a steam outlet side electrode 2, a clamping handle 3 and an upright post 6. The upright column 6 is fixedly connected with the middle part of the clamping handle 3, the two ends of the clamping handle 3 are respectively provided with a steam inlet side electrode 1 and a steam outlet side electrode 2, and the steam inlet side electrode 1 and the steam outlet side electrode 2 are made of copper.
As shown in fig. 2 and 4, the steam intake side electrode 1 includes a first connection plate 11 and a plurality of steam intake side processed portions. One side of the first connecting plate 11 close to the upright post 6 is installed on the clamping handle 3, one side of the first connecting plate 11 far away from the upright post 6 is a flange surface 14, the flange surface 14 of the first connecting plate 11 extends towards the direction far away from the upright post 6 to form a plurality of steam inlet side processing parts, and the plurality of steam inlet side processing parts are arranged in a circular arc shape. It should be further noted that when the steam inlet side electrode 1 machines the turbine nozzle block 20, the plurality of steam inlet side machined portions are arranged exactly around the center circular arc of the turbine nozzle block 20.
Further, a first side surface (a side surface close to the center of the turbine nozzle group when the steam inlet side electrode is used for machining the steam passage of the turbine nozzle group, namely, an upper side surface of the first connecting plate 11 in fig. 2) and a second side surface (a side surface far away from the center of the turbine nozzle group, namely, a lower side surface of the first connecting plate 11 in fig. 2 when the steam inlet side electrode is used for machining the steam passage of the turbine nozzle group) of the first connecting plate 11 are cambered surfaces, two sides of the first connecting plate 11 are reference surfaces 13, the reference surfaces 13 and the flange surfaces 14 are planes, the reference surfaces 13 and the flange surfaces 14 are perpendicular to each other, and the reference surfaces 13 are parallel to the axis (namely, the axial direction of machine tool machining) of the stand column 6, so that the steam inlet side electrode 1 can be conveniently aligned. Further, the flange face 14 of the first connecting plate 11 is provided with a drain groove 15 between the adjacent steam inlet side processed portions for discharging gas and iron pieces generated in the electrolytic process.
As shown in fig. 2 and 4, the steam outlet side electrode 2 includes a second connection plate 28 and a plurality of steam outlet side processed portions. One side that second connecting plate 28 is close to stand 6 is installed on centre gripping handle 3, and one side that second connecting plate 28 kept away from stand 6 is flange face 14, and the flange face 14 of second connecting plate 28 is towards the direction of keeping away from stand 6 extension formation a plurality of steam outlet side processing portions, and a plurality of steam outlet side processing portions are arc-shaped and arrange. It should be further noted that, when the steam outlet side electrode 2 machines the nozzle group of the steam turbine, the plurality of steam outlet side machined portions are arranged exactly around the center circular arc of the nozzle group.
Further, a first side surface (when the steam outlet side electrode is used for machining a steam passage of the steam turbine nozzle block, a side surface close to the center of the steam turbine nozzle block, namely, an upper side surface of the second connecting plate 28 in fig. 3) and a second side surface (when the steam outlet side electrode is used for machining the steam turbine nozzle block, a side surface far away from the center of the steam turbine nozzle block, namely, a lower side surface of the second connecting plate 28 in fig. 3) of the second connecting plate 28 are cambered surfaces, two sides of the second connecting plate 28 are reference surfaces 13, the reference surfaces 13 and the flange surfaces 14 are planes, the reference surfaces 13 and the flange surfaces 14 are perpendicular to each other, and the reference surfaces 13 are parallel to an axis (namely, an axial direction of machine tool machining) of the stand column 6, so that the steam outlet side electrode 2 can be conveniently aligned. In addition, the flange face 14 of the second connecting plate 28 is provided with drain grooves 15 between the adjacent steam outlet side processed portions for discharging gas and iron pieces generated during the electrolysis.
In the present embodiment, the steam inlet side processed portion of the steam inlet side electrode 1 is two in number, and includes the first processed portion 7 and the second processed portion 8. The side surfaces of the first processed part 7 and the second processed part 8 are enveloped by the first face arc profile 16, the first parting profile 26 and the first back arc profile 17.
In the present embodiment, the number of the steam outlet side processed portions of the steam outlet side electrode 2 is two, including the third processed portion 9 and the fourth processed portion 10. The side surfaces of the third machined part 9 and the fourth machined part 10 are enveloped by the second face arc-shaped profile 19, the second parting surface 27 and the second back arc-shaped profile 18. Wherein the first surface arc profile 16 and the second back arc profile 18 form one side of the cavity and the first back arc profile 17 and the second surface arc profile 19 form the other side of the cavity.
As shown by referring to fig. 6, 7, 8, and 9, the first machining part 7 and the second machining part 8 of the inlet side electrode 1 machine the region to be machined of the turbine nozzle group 20 from the inlet side of the turbine nozzle group 20, and the third machining part 9 and the fourth machining part 10 of the outlet side electrode 2 machine the region to be machined of the turbine nozzle group 20 from the outlet side of the turbine nozzle group 20. And forming a cavity after the processing of the processing region is finished, forming a blade cascade in the unprocessed region, and separating adjacent cavities through the blade cascade. For example, the first cascade 21 and the second cascade 22 are separated by a first cavity 24, and the second cascade 22 and the third cascade 23 are separated by a second cavity 25.
Therefore, the electrode device for machining the steam passage of the steam turbine nozzle set in the embodiment can be used for once electrolytically machining two cavities, so that the machining efficiency is improved, the times of positioning and clamping a workpiece in the electrolytic machining process are greatly reduced, the accumulated error generated by clamping and positioning is reduced, and the size machining precision of a steam turbine nozzle set product is improved. Meanwhile, the labor operation intensity of operators can be greatly reduced, the problems of high labor intensity and low processing efficiency in the processing process are solved, the frequent electrolyte charging and discharging times are avoided, the operation environment condition is improved to a certain extent, and the safety and the reliability of the product manufacturing process are improved.
In the present embodiment, the sum of the machining length L1 of the steam inlet side machining part and the machining length L2 of the steam outlet side machining part is greater than the width d of the blade row in the turbine nozzle group 20, and the steam inlet side machining part and the steam outlet side machining part overlap 2 to 3mm in the turbine nozzle group 20, that is, 2mm < L1+ L2-d < 3mm. It should be further noted that the processing length L1 of the steam inlet side processing portion refers to a distance from one end of the first back arc-shaped surface 17 far away from the flange surface 14 to the flange surface 14; the processing length L2 of the steam outlet side processing portion refers to a distance from one end of the second back arc-shaped surface 18 far away from the flange surface 14 to the flange surface 14. By adopting the above dimensional parameters, the steam inlet side and the steam outlet side of the turbine nozzle group 20 can be communicated.
Further, the machining length L1 of the steam inlet side machining part is greater than the machining length L2 of the steam outlet side machining part, so that the overlapping area of the steam inlet side machining part and the steam outlet side machining part is close to the steam outlet side of the turbine nozzle group 20. Because the lap joint area is close to the steam outlet side of the steam turbine nozzle group 20, the lap joint area is easy to observe and throw and repair, and meanwhile, the safe advancing and retreating paths of the steam inlet side electrode 1 and the steam outlet side electrode 2 can be considered.
As shown in fig. 1, 4, 5, 11 and 12, the electrode assembly further includes a compression block 4 and a compression screw 5. One side of the second connecting plate 28 of the steam outlet side electrode 2 close to the upright post 6 is provided with a cylindrical electrode handle 12, the cylindrical surface of the electrode handle 12 is milled flat to form a positioning surface parallel to the reference surface 13, and an electrode handle mounting groove is formed in the clamping handle 3 along the axial direction and used for inserting the electrode handle 12.
The lateral wall of centre gripping handle 3 corresponds the locating surface department of electrode handle 12 and has seted up the opening, and compact heap 4 is installed to the opening part, has seted up the through-hole on the compact heap 4, and electrode handle 12 corresponds through-hole department and has seted up the screw hole, and housing screw 5 passes compact heap 4, centre gripping handle 3 in proper order and revolves into the threaded hole on the electrode handle 12, comes to compact heap 4, centre gripping handle 3 and electrode handle 12 fixed connection.
When the compression screw 5 is not screwed on the compression block 4 and the electrode handle 12, a gap of 0.1-0.2mm is reserved between the positioning surface of the electrode handle 12 and the compression block 4. When the compression block 4 and the electrode handle 12 are screwed down by the compression screw 5, the inner circular surfaces of the opening of the electrode handle 12 and the clamping handle 3 are tightly attached under the action of the pre-tightening force of the threads, so that the pressure of the electrode handle 12 and the clamping handle 3 at the screw compression contact surface is increased, the friction force is increased, and the electrode handle 12 is prevented from falling off from the electrode handle mounting groove of the clamping handle 3. In addition, because the electrode handle 12 is made of copper and the clamping handle 3 is made of iron, the electrode handle 12 is thermally expanded to compensate the gap between the electrode handle 12 and the clamping handle 3 due to the thermal expansion tendency of copper, which is larger than that of iron, during the electric machining process, so that the electrode handle 12 and the clamping handle 3 are more firmly fastened together.
It should be further noted that the first connecting plate 11 of the steam inlet side electrode 1 is also provided with an electrode handle 12 at a side close to the upright post 6, and the electrode handles 12 of the steam inlet side electrode 1 and the steam outlet side electrode 2 are connected with the clamping handle 3 in the same manner, which is not described herein again.
The electrode device of this embodiment owing to adopt above-mentioned connection structure, the clamping handle 3 can be more simple and convenient swift installation and dismantle steam inlet side electrode 1 and play steam side electrode 2 to steam inlet side electrode 1 and play steam side electrode 2 positioning accuracy are better, change in standardized processing in batches.
Example 2:
in this embodiment, an electrode device for machining a steam passage of a turbine nozzle group is different from embodiment 1 in that the number of machined portions of the steam inlet side electrode 1 is three and the number of machined portions of the steam outlet side electrode 2 is three.
Example 3:
in this embodiment, an electrode device for steam turbine nozzle block steam passage machining differs from embodiment 1 in that the number of machined portions of the steam inlet side electrode 1 is five and the number of machined portions of the steam outlet side electrode 2 is five.
In order to more quickly process the nozzle group of the steam turbine, the number of processing portions of the steam inlet side electrode 1 and the steam outlet side electrode 2 is not limited to two, three, four, or five, and may be more.
The invention also provides a processing method of the steam turbine nozzle steam passage, which mainly comprises the following steps:
s1, preliminarily determining the number of processing parts on a steam inlet side electrode 1 and a steam outlet side electrode 2 according to the shape and the size of a steam passage of a nozzle and by combining actual processing capacity and technical level; the number of the processing parts of the electrode is in direct proportion to the production efficiency, and the number of the processing parts is large, so that the manufacturing difficulty of the electrode is increased, and 2-5 electrodes are suitable generally;
s2, calculating and optimizing a moving path and a moving path of the steam inlet side electrode 1 and the steam outlet side electrode 2 in the machining process, verifying a safety gap between the steam inlet side electrode 1 and the steam outlet side electrode 2 and a steam passage cascade profile in the machining process, and determining the design sizes of the steam inlet side electrode 1 and the steam outlet side electrode 2;
s3, selecting or manufacturing the steam inlet side electrode 1 and the steam outlet side electrode 2 according to the number of the processing parts on the steam inlet side electrode 1 and the steam outlet side electrode 2 determined in the step S1 and the design sizes of the steam inlet side electrode 1 and the steam outlet side electrode 2 determined in the step S1, and installing the steam inlet side electrode 1 and the steam outlet side electrode 2 on the clamping handle 3;
and S4, the steam inlet side electrode 1 and the steam outlet side electrode 2 are sequentially and alternately processed into half-cavity processing on the steam inlet side and the steam outlet side of the steam turbine nozzle 20 according to the designed moving path.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (8)
1. The utility model provides an electrode assembly for steam turbine nozzle group steam passage processing which characterized in that: the device comprises a steam inlet side electrode (1), a steam outlet side electrode (2), a clamping handle (3) and an upright column (6), wherein the upright column (6) is fixedly connected with the middle part of the clamping handle (3), the steam inlet side electrode (1) and the steam outlet side electrode (2) are respectively installed at two ends of the clamping handle (3), and the steam inlet side electrode (1) and the steam outlet side electrode (2) are made of copper;
the steam inlet side electrode (1) comprises a first connecting plate (11) and a plurality of steam inlet side processing parts, one side, close to the upright post (6), of the first connecting plate (11) is installed on the clamping handle (3), one side, far away from the upright post (6), of the first connecting plate (11) is a flange surface (14), the flange surface (14) of the first connecting plate (11) extends in the direction far away from the upright post (6) to form the plurality of steam inlet side processing parts, and the plurality of steam inlet side processing parts are arranged in a circular arc shape;
the steam outlet side electrode (2) comprises a second connecting plate (28) and a plurality of steam outlet side processing parts, one side, close to the upright post (6), of the second connecting plate (28) is installed on the clamping handle (3), one side, far away from the upright post (6), of the second connecting plate (28) is a flange surface (14), the flange surface (14) of the second connecting plate (28) extends in the direction far away from the upright post (6) to form the plurality of steam outlet side processing parts, and the plurality of steam outlet side processing parts are arranged in an arc shape;
the first side face and the second side face of the first connecting plate (11) are cambered surfaces, the two sides of the first connecting plate (11) are reference surfaces (13), and the reference surfaces (13) are perpendicular to the flange surfaces (14);
the first side face and the second side face of the second connecting plate (28) are cambered surfaces, the two sides of the second connecting plate (28) are datum planes (13), and the datum planes (13) and the flange planes (14) are perpendicular to each other;
cylindrical electrode handles (12) are arranged on one sides, close to the upright columns (6), of the first connecting plate (11) of the steam inlet side electrode (1) and the second connecting plate (28) of the steam outlet side electrode (2), the cylindrical surfaces of the electrode handles (12) are milled flat to form positioning surfaces parallel to the reference surface (13), and electrode handle mounting grooves are formed in the clamping handles (3) along the axial direction and used for being inserted into the electrode handles (12);
the electrode device also comprises a compression block (4) and a compression screw (5);
the lateral wall of centre gripping handle (3) corresponds the locating surface department of electrode handle (12) has seted up the opening, the opening part is installed compact heap (4), the through-hole has been seted up on compact heap (4), electrode handle (12) correspond through-hole department set up threaded hole, housing screw (5) pass in proper order compact heap (4), centre gripping handle (3) are twisted soon and are advanced in threaded hole on electrode handle (12), will compact heap (4), centre gripping handle (3) and electrode handle (12) fixed connection get up.
2. The electrode assembly of claim 1, wherein: when the steam inlet side electrode (1) is used for processing a steam turbine nozzle group (20), the plurality of steam inlet side processing parts are just arrayed around the center of the steam turbine nozzle group (20) in a circular arc shape;
when the steam outlet side electrode (2) is used for processing the steam turbine nozzle group (20), the plurality of steam outlet side processing parts are just arranged around the center of the steam turbine nozzle group (20) in a circular arc shape.
3. The electrode device of any one of claims 1-2, wherein: the number of the steam inlet side processing parts of the steam inlet side electrode (1) is two, three, four or five, and the number of the steam outlet side processing parts of the steam outlet side electrode (2) is two, three, four or five.
4. The electrode assembly of claim 3, wherein: the number of the steam inlet side processing parts of the steam inlet side electrode (1) is two, the steam inlet side processing parts comprise a first processing part (7) and a second processing part (8), and the side surfaces of the first processing part (7) and the second processing part (8) are formed by enveloping a first surface arc profile (16), a first parting profile (26) and a first back arc profile (17);
the number of the steam outlet side processing parts of the steam outlet side electrode (2) is two, the steam outlet side processing parts comprise a third processing part (9) and a fourth processing part (10), and the side surfaces of the third processing part (9) and the fourth processing part (10) are formed by enveloping a second surface arc molding surface (19), a second parting surface (27) and a second back arc molding surface (18);
wherein the first face arc profile (16) and the second back arc profile (18) machine one side of a cavity of the turbine nozzle block (20), and the first back arc profile (17) and the second face arc profile (19) machine the other side of the cavity of the turbine nozzle block (20).
5. The electrode device of any one of claims 1-2, wherein: the sum of the processing length L1 of the steam inlet side processing part and the processing length L2 of the steam outlet side processing part is larger than the width d of the blade cascade in the steam turbine nozzle group (20), and the steam inlet side processing part and the steam outlet side processing part are overlapped by 2-3mm in the steam turbine nozzle group (20).
6. The electrode apparatus of claim 5, wherein: the processing length L1 of the steam inlet side processing part is greater than the processing length L2 of the steam outlet side processing part, so that the overlapping area of the steam inlet side processing part and the steam outlet side processing part is close to the steam outlet side of the steam turbine nozzle group (20).
7. The electrode device of any one of claims 1-2, wherein: the flange face (14) of the first connecting plate (11) is provided with a drain groove (15) between the adjacent steam inlet side processing parts, and the flange face (14) of the second connecting plate (28) is provided with a drain groove (15) between the adjacent steam outlet side processing parts.
8. The electrode assembly of claim 1, wherein:
when the compression screw (5) is not screwed down on the compression block (4) and the electrode handle (12), a gap of 0.1-0.2mm is reserved between the positioning surface of the electrode handle (12) and the compression block (4);
when the compression screw (5) is used for screwing the compression block (4) and the electrode handle (12), the electrode handle (12) is tightly attached to the inner circular surface of the opening of the clamping handle (3) under the action of a thread pre-tightening force.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111168868.9A CN113714576B (en) | 2021-09-30 | 2021-09-30 | Electrode device for processing steam passage of steam turbine nozzle group |
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| CN202111168868.9A CN113714576B (en) | 2021-09-30 | 2021-09-30 | Electrode device for processing steam passage of steam turbine nozzle group |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963894A (en) * | 1974-01-24 | 1976-06-15 | Chromalloy American Corporation | Turbine-nozzle manufacturing apparatus |
| US6964554B2 (en) * | 2003-03-31 | 2005-11-15 | Siemens Westinghouse Power Corporation | Drop-in nozzle block for steam turbine |
| CN103008806A (en) * | 2012-11-27 | 2013-04-03 | 哈尔滨汽轮机厂有限责任公司 | Graphite electrode for steam turbine triple blade steam passage electroprocessing and preparation method for graphite electrode |
| CN103990875B (en) * | 2014-05-09 | 2017-05-17 | 首都航天机械公司 | Compound electrode machining method for improving efficiency of electric spark machining of turbine disc with blade tip shroud |
| CN204511525U (en) * | 2015-03-30 | 2015-07-29 | 北京龙威发电技术有限公司 | A kind of novel 600MW level steam turbine nozzle sets |
| CN107283008A (en) * | 2016-03-30 | 2017-10-24 | 通用电气公司 | Electric discharge machining apparatus and the method being processed using electrode assemblie to workpiece |
| CN205950038U (en) * | 2016-06-15 | 2017-02-15 | 北京龙威发电技术有限公司 | Processing is separated with novel electrode clamping frock to electric smelting of steam turbine injector set |
| CN205718794U (en) * | 2016-07-04 | 2016-11-23 | 哈尔滨汽轮机厂有限责任公司 | A kind of Steam Turbine injector electrode test measuring device |
| CN108994407B (en) * | 2018-08-14 | 2020-05-15 | 中国航发南方工业有限公司 | Four-linkage guide blade interference air film hole positioning clamp, machining device and machining method |
| CN111730155B (en) * | 2020-05-19 | 2022-05-24 | 南京航空航天大学 | Multi-blade nesting electrolytic cathode fixture device and application thereof |
| CN112620844B (en) * | 2020-12-02 | 2021-11-16 | 哈尔滨工业大学 | Multi-channel parallel machining electrode for closed blisk rough machining |
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