CN113579379B - Electrochemical machining method of ultrathin fingertip sheet and fingertip sheet rotating machining device - Google Patents
Electrochemical machining method of ultrathin fingertip sheet and fingertip sheet rotating machining device Download PDFInfo
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- CN113579379B CN113579379B CN202110909101.0A CN202110909101A CN113579379B CN 113579379 B CN113579379 B CN 113579379B CN 202110909101 A CN202110909101 A CN 202110909101A CN 113579379 B CN113579379 B CN 113579379B
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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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- 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
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
Abstract
The invention relates to an electrochemical machining method of an ultrathin fingertip sheet and a fingertip sheet rotating machining device, belonging to the technical field of electrochemical machining processes, wherein the electrochemical machining method comprises the following steps: dividing a fingertip groove area of a fingertip sheet bottom sheet into a plurality of annular areas concentric with the fingertip sheet, wherein the annular areas are from an inner ring to an outer ring, a fingertip groove obliquely spans all the annular areas, a transition area is reserved between every two adjacent rings, a fingertip groove curve in the transition area is smooth, and the influence of the inconsistency of the electrode processing speed on the fingertip groove width is counteracted through the partition compensation of the fingertip sheet bottom sheet; the width consistency of the fingertip sheet groove can be effectively improved, and the fingertip beam consistency ensures that the fingertip beam has good elasticity; the invention adopts a rotary scanning photographic electrolytic machining mode for the first time, controls the electrolyte to flow from the root part to the head part of the fingertip beam, greatly reduces the transverse scouring of the electrolyte to the fingertip elastic beam, controls the deformation of the fingertip elastic beam, ensures that the machined fingertip sheet inner ring and the fingertip beam side surface have no crack, recast layer and other tissue defects, and has good surface integrity.
Description
Technical Field
The invention relates to the technical field of electrochemical machining processes, in particular to an electrochemical machining method of an ultrathin finger tip piece and a finger tip piece rotating machining device.
Background
Fingertip sealing is a revolutionary sealing technology which is widely applied to the air passage sealing and the main shaft sealing of an aircraft engine and has gained attention at home and abroad in recent years. The basic structure of the fingertip seal is shown in fig. 1. As a contact seal, a finger seal is usually composed of a stack of precisely machined thin metal sheets and front and rear shutters, which are fixed by pins, riveted, welded, and screwed together. A plurality of fingertip flexible slender fingertip beams which are uniformly distributed in the circumferential direction are processed on each metal sheet, and the free ends of the fingertip beams are arranged on the surface of the rotor. During assembly, the multiple layers of metal sheets are arranged in a staggered mode, so that gaps between fingertip curved beams on one metal sheet are covered by fingertip curved beams on an adjacent sheet, and therefore fluid is sealed by the thin metal sheets which are arranged in a staggered mode and radial contact between the rotor and the fingertip shoes.
The contact type use environment of the fingertip pieces with high temperature and high pressure determines that the constituent materials of the fingertip pieces are difficult to process, the structure is complex, the requirement on the dimensional precision is high, and the requirement on the surface quality is high. The higher requirement of the fingertip sheet causes that the processing of the fingertip sheet is always a big difficulty in the field of aviation manufacturing. The current processing mode of the fingertip sheet mainly comprises a single laser cutting mode and a grouped linear cutting mode. In both modes, metal in a processing area is heated at a high temperature to remove materials, so that the foil reaches the size requirement, but a recast layer exists in the processing area, and the surface roughness does not meet the use requirement.
The photographic electrolytic processing technology is a special processing method formed by fusing a plurality of technologies such as laser photoplotting, screen printing, exposure, development, electrolytic processing and the like. The photo electrochemical machining comprises seven procedures of plate cutting/cleaning, photo drawing and film coating, exposure, development, electrochemical machining and film removing, and is shown in figure 2. The applicability of the photographic electrolytic processing to the processing material is strong, the processing material is not limited by the strength and the hardness of the material, and the photographic electrolytic processing can be used for processing almost all conductive materials; the method has the advantages of short production preparation period, high processing efficiency and high processing precision, and is suitable for various production scales of single piece and batch. Therefore, the inventor applies the photo electrochemical machining technology to the processing of the structure of the fingertip pieces, and provides an electrochemical machining method of the ultrathin fingertip piece and a fingertip piece rotating machining device.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides an electrochemical machining method of an ultrathin fingertip sheet and a fingertip sheet rotating machining device, and solves the technical problems that the ultrathin large-size fingertip sheet is difficult to machine and the machining quality is difficult to meet.
(2) Technical scheme
The embodiment of the invention provides an electrochemical machining method of an ultrathin finger tip sheet and a rotating machining device of a finger tip sheet, and in a first aspect, the electrochemical machining method of the ultrathin finger tip sheet at least comprises the following steps:
step S110: cutting a reserved clamping space of a strip-shaped foil for processing a finger tip sheet, and cleaning the surface of the cut strip-shaped foil;
step S120: drawing a pattern of a processed fingertip sheet in drawing software, printing the pattern on a film through a laser photoplotter to obtain a fingertip sheet bottom sheet for photographic electrolytic processing, dividing a fingertip groove area of the fingertip sheet bottom sheet into a plurality of annular areas concentric with the fingertip sheet, and dividing the annular areas into an inner ring 1, a ring 2 and a ring 8230from the inner ring to an outer ring, wherein a fingertip groove obliquely crosses N areas from the ring 1 to the ring N, a transition area is reserved between two adjacent rings, a fingertip groove curve in the transition area is smooth, and the division compensation of the fingertip sheet bottom sheet is used for offsetting the influence of the inconsistency of the electrode processing speed on the width of the fingertip groove;
step S130: coating a photosensitive protective film on the surface of the foil workpiece in the step S110, and drying in an oven;
step S140: uniformly adsorbing the fingertip sheet substrate subjected to the partition compensation in the step S120 on the surface of the foil workpiece coated with the photosensitive protective film, and then exposing the fingertip sheet substrate through ultraviolet light irradiation;
step S150: washing the unexposed part of the foil workpiece by a developing solution, and etching the pattern on the fingertip sheet film on the surface of the foil workpiece;
step S160: mounting the foil workpiece after the step S150 on a fingertip sheet rotating processing device, carrying out rotating photographic electrolytic processing on the part, which is not covered with the protective film, of the foil workpiece through a rotating electrode, and processing the patterns on the bottom sheet of the fingertip sheet to the surface of the foil workpiece;
step S170: and (4) putting the processed fingertip pieces into the film removing liquid to remove the protective film, so as to obtain the final fingertip piece processing pattern.
Further, in step S120, the fingertip groove area of the fingertip sheet bottom sheet is divided into three annular areas concentric with the fingertip sheet, from the inner ring to the outer ring, divided into three areas of ring 1, ring 2, and ring 3, and the fingertip groove obliquely crosses the three areas of ring 1 to ring 3.
Furthermore, the annular outer diameter phi 329mm, the inner diameter phi 298.5mm, the fingertip sheet thickness 0.3mm and the fingertip groove width 0.3mm of the fingertip sheet.
Further, in step S120, the area from phi 298.5mm to phi 318mm on the bottom sheet of the fingertip sheet is evenly divided into ring 1, ring 2 and ring 3, wherein the width of the fingertip groove of ring 1 is 0.15mm, the width of the fingertip groove of ring 2 is 0.20mm, the width of the fingertip groove of ring 3 is 0.25mm, a transition area of 0.5mm is left between ring 1 and ring 2, and a transition area of 0.05mm and a smooth transition area are left between ring 2 and ring 3. .
Further, in step S160, the foil workpiece is mounted on the fingertip piece rotating processing device, the foil workpiece with a complete pattern protection film is fixed on the surface of the workbench under the action of the pressing plate, the cathode is driven by the rotating shaft to rotate at a constant speed, the anode is connected to the positive electrode of the electric column power supply, the cathode is connected to the negative electrode of the electric column power supply, the electrolyte flows through the processing gap between the electrode and the workpiece through the infusion pipeline, the power switch is turned on, the electric processing loop is switched on, the rotating electrode processes the exposed metal area without the protection film, and finally, the pattern on the bottom sheet of the fingertip piece is processed to the surface of the workpiece.
A second aspect of an embodiment of the present invention provides a fingertip piece rotating processing apparatus, which is used for electrochemical processing of the ultrathin fingertip piece described in the first aspect, and the apparatus includes a pressing plate, a rotating electrode, an anode charging post and a cathode charging post, where the center of the pressing plate is a hollow area, the periphery of the pressing plate is a solid portion, a foil workpiece of the fingertip piece is placed concentrically with the hollow area, a reserved clamping space of the foil is pressed under the peripheral solid portion of the pressing plate, the rotating electrode is mounted with the center of the pressing plate as a rotating center so as to be capable of rotating in the hollow area, the anode charging post is disposed on the solid portion of the pressing plate, the cathode charging post is disposed perpendicular to and electrically connected to the rotating electrode, and the cathode charging post is provided with an electrolyte channel along a central axis and is communicated with the electrolyte channel in the rotating electrode along a fingertip radial direction.
(3) Advantageous effects
In conclusion, compared with the prior art, the electrochemical machining method of the ultrathin finger tip sheet has the following advantages:
(1) The electrolytic machining surface has the characteristics of high machining surface quality, no recast layer and the like. The invention adopts photographic electrolytic processing to the inner ring of the fingertip sheet and the side surface of the fingertip beam without crack, recast layer and other tissue defects, and has good surface integrity.
(2) The field adopts a rotary scanning photographic electrolytic machining mode for the first time, and the electrolyte is controlled to flow from the root part of the fingertip beam to the head part, so that the transverse scouring of the electrolyte on the fingertip elastic beam is greatly reduced, and the deformation of the fingertip elastic beam is controlled.
(3) The circular scanning photographic electrolytic machining is matched with a fingertip sheet sub-area compensation machining mode, the size change difference of the fingertip sheet is smoothly transited, and the width consistency of the fingertip sheet groove can be effectively improved. The consistency of the fingertip beams ensures that the fingertip beams have good elasticity; when the fingertip sheet sealing mechanism is used for sealing an air passage of an aircraft engine and a main shaft, the fingertip sheet sealing mechanism can be effectively attached to the side face of the main shaft under the action of pretightening force, and gas leakage is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a scene sealed with a fingertip sheet assembly.
FIG. 2 is a flowchart of a photographic electrolytic processing procedure.
Fig. 3 is a schematic diagram of a conventional linear scanning processing fingertip piece.
FIG. 4 is a schematic diagram of the fingertip ring scan and electrolyte flow pattern used in the present invention.
Fig. 5 is a schematic view of a tip and groove.
FIG. 6 is a schematic view of the present invention using a rotophotographic electrolytic process for finger tip plates.
Fig. 7 is a schematic illustration of a fingertip sheet backsheet partition of the present invention.
Fig. 8 is a schematic view of a fingertip piece rotating processing device according to the present invention.
Fig. 9 is a schematic cross-sectional view of a fingertip piece rotating processing device of fig. 8.
In the figure: 1, pressing a plate; 2-a rotating electrode; 3-a foil workpiece with a tip sheet; 4-charging the anode; 5-cathode upper electrode column.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations and improvements in the parts, components and connection means, without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention provides an annular scanning type electrochemical machining method, which aims at the characteristics that an ultrathin large-size fingertip material is difficult to machine, a fingertip is easy to deform under stress during machining, the requirement on the consistency of groove width is high and the like.
In the conventional linear scanning photographic electrolytic machining process of the finger tip plate in the prior art, electrolyte flows out to a machining gap between an electrode and a foil workpiece through an electrode hollow groove, and then the electrolyte is dissipated outside the workpiece. As shown in fig. 3, when the electrode moves from the left side of the fingertip sheet to the inner ring area of the fingertip, that is, the processing of the fingertip sheet on the left side of the fingertip ring is completed, the fingertip beam is in a suspended state. At this time, the fingertip beam is subjected to plastic deformation due to the scouring of the electrolyte flowing out from the machining gap, and cannot be corrected.
The principle of the processing mode of the rotary scanning surface provided by the invention is shown in figure 4, and the electrolyte finger tip piece is controlled to flow from the outer ring to the inner ring (V) of the annular electrode in the annular radial direction Electrolyte (application) Radial); at the same time, the electrode is driven by the main shaft of the machine tool to do circular motion (V) Electrode for electrochemical cell Circumferential); the two are compounded, the flowing speed V of the electrolyte Compounding The finger tip plate is arranged along the rotating direction of the finger tip plate, namely, the electrolyte flows from the root part to the top part of the finger tip beam, and the deformation caused by the transverse scouring of the electrolyte to the finger tip beam is avoided.
The fingertip beams of the fingertip pieces are uniformly arrayed in the inner ring, and the uniformity of the groove width between the two fingertip beams determines that the fingertip pieces have uniform load force on the main shaft of the engine and provide stable air flow blocking capacity. In the rotating photographic electrolytic machining process, the linear velocity of scanning machining is inconsistent, so that the width of the finger tip groove (shown in figure 5) is caused, the linear velocity is increased from the outer ring to the inner ring in sequence, the pressure of the finger tip beam on an engine is inconsistent, and finally gas leakage is caused.
The rotating photographic electrolytic machining causes the inconsistency of the groove width between the fingertip beams in the fingertip pieces, and the analysis of the main reasons is as follows: during annular scanning, the electrode rotates at a set angular speed; the linear velocities of the electrodes in the regions with different lengths are inconsistent, as shown in fig. 6, the outer ring of the fingertip sheet is also the outer end of the electrode, and the processing speed is higher V 1 The electrode retention time is short, the current density is low, and the width size of the processed finger tip groove is small; the inner ring of the finger tip sheet, which is also the near end of the electrode, has a slower processing speed V 2 The electrode has long retention time and higher current density, and the width size of the processed finger tip groove is large. Therefore, the invention realizes the uniform processing of the width of the fingertip groove by a method of pre-compensating the fingertip sheet.
In a first aspect, referring to fig. 4 to 7, the present invention provides a method for electrochemically processing an ultra-thin finger tip sheet, the method at least comprising the following steps S110 to S170:
step S110: cutting a reserved clamping space of a strip-shaped foil for processing finger tip sheets, and cleaning the surface of a cut foil workpiece without allowing dirt residues;
step S120: drawing a pattern of a processed fingertip sheet in drawing software, printing the pattern on a film through a laser drawing machine to obtain a fingertip sheet bottom sheet for photographic electrolytic processing, wherein in order to ensure the width consistency of a fingertip sheet groove, a fingertip groove area of the fingertip sheet bottom sheet is divided into a plurality of annular areas concentric with the fingertip sheet, from an inner ring to an outer ring, the annular areas are divided into a ring 1, a ring 2, an 8230a ring N, the fingertip groove obliquely crosses N areas from the ring 1 to the ring N, a transition area is reserved between two adjacent rings, and a fingertip groove curve in the transition area is smooth, so that a step fold line cannot appear. Fig. 7 shows that the fingertip sheet is divided into three areas from ring 1 to ring 3 from inside to outside, and the width of the fingertip groove obliquely spans the three areas from ring 1 to ring 3 and is divided into 3 parts by three concentric rings. The fingertips of the ring 2 and the ring 3 have a transition area in which the fingertip groove needs to be smooth. In the step, the subarea compensation of the finger tip film bottom plate is used for offsetting the influence of the inconsistent electrode processing speed on the width of the finger tip groove.
Step S130: coating a photosensitive protective film on the surface of the foil workpiece in the step S110, and drying in an oven;
step S140: uniformly adsorbing the fingertip sheet substrate subjected to the partition compensation in the step S120 on the surface of the foil workpiece coated with the photosensitive protective film, and then exposing the fingertip sheet substrate through ultraviolet light irradiation;
step S150: washing the unexposed part of the foil workpiece by a developing solution, and etching the pattern on the fingertip sheet on the surface of the foil workpiece;
step S160: mounting the foil workpiece obtained in the step S150 on a fingertip sheet rotating processing device, performing rotating photographic electrolytic processing on the part, which is not covered with the protective film, of the foil workpiece through a rotating electrode, and processing the pattern on the fingertip sheet to the surface of the foil workpiece;
step S170: and (4) putting the processed fingertip pieces into the film removing liquid to remove the protective film, so as to obtain the final fingertip piece processing pattern.
In step S120, the fingertip groove area of the fingertip sheet is divided into three annular areas concentric with the fingertip sheet, from the inner ring to the outer ring, and divided into ring 1, ring 2, and ring 3, and the fingertip groove obliquely crosses the three areas of ring 1 to ring 3.
As another embodiment, in step S160, the foil workpiece is mounted on the fingertip piece rotating processing device, as shown in fig. 8, the foil workpiece with a complete pattern protection film is fixed on the surface of the worktable under the action of the pressing plate, the cathode is driven by the rotating shaft to rotate at a constant speed, the anode is connected to the positive pole of the electric column power supply, the cathode is connected to the negative pole of the electric column power supply, the electrolyte flows through the processing gap between the electrode and the workpiece through the infusion pipeline, the power switch is turned on, the electric processing circuit is switched on, the rotating electrode processes the exposed metal area without the protection film, and finally, the pattern on the fingertip piece bottom sheet is processed to the surface of the workpiece.
In a second aspect, referring to fig. 9, the present invention further provides a fingertip piece rotating processing apparatus, which is used for electrochemical processing of the ultra-thin fingertip piece according to claim 1, and is characterized in that the apparatus includes a pressing plate, a rotating electrode, an anode charging post and a cathode charging post, the center of the pressing plate is a hollow area, the periphery of the pressing plate is a solid portion, a foil workpiece of the fingertip piece is concentrically placed with the hollow area, a reserved clamping space of the foil is pressed under the peripheral solid portion of the pressing plate, the rotating electrode is mounted with the center of the pressing plate as a rotating center so as to be capable of rotating in the hollow area, the anode charging post is disposed on the solid portion of the pressing plate, the cathode charging post is disposed perpendicular to and electrically connected to the rotating electrode, the cathode charging post is provided with an electrolyte channel along a central axis and is communicated with the electrolyte channel in the rotating electrode along a fingertip radial direction.
In conclusion, the electrolytic machining surface adopted by the invention has the characteristics of high machining surface quality, no recast layer and the like. The invention adopts the photographic electrolytic processing to the inner ring of the fingertip sheet and the side surface of the fingertip beam without cracks, recast layers and other tissue defects, and has good surface integrity. The method adopts a rotary scanning photographic electrolytic machining mode for the first time, controls the electrolyte to flow from the root part of the fingertip beam to the head part, greatly reduces the transverse scouring of the electrolyte to the fingertip elastic beam, and controls the deformation of the fingertip elastic beam. The invention combines the annular scanning photographic electrolytic machining with the fingertip sheet sub-area compensation machining mode, smoothly transitions the difference of the fingertip sheet size change, and can effectively improve the fingertip sheet groove width consistency. The consistency of the fingertip beams ensures that the fingertip beams have good elasticity; when the fingertip piece sealing mechanism is used for sealing an air passage of an aero-engine and a main shaft, the fingertip piece sealing mechanism can be effectively attached to the side face of the main shaft under the action of pretightening force, and gas leakage is reduced.
The present invention will be described in detail with reference to the following examples of finger tip sheets with an outer diameter of 329mm, wherein the finger tip sheets have a thickness of 0.3mm, an outer diameter of 329mm and an inner diameter of 298.5mm. Suspended fingertips are uniformly distributed, and the width of the fingertip groove is 0.3mm.
(1) Cutting/cleaning: cutting a 0.3mm thick strip foil into a square shape of 400mm multiplied by 400 mm; the surface of the workpiece is cleaned, and no dirt is allowed to remain.
(2) Preparing and processing a finger tip sheet bottom sheet: and printing the finger tip film on a film by a laser photoplotter by using drawing software according to the requirements of the finger tip film to obtain the finger tip film negative film for photographic electrolytic processing. The area phi 298.5mm to phi 318mm on the bottom plate is evenly divided into a ring 1, a ring 2 and a ring 3. Wherein, the groove width of the ring 1 is 0.15mm, the groove width of the ring 2 is 0.20mm, and the groove width of the ring 3 is 0.25mm. A transition area of 0.5mm is reserved between the ring 1 and the ring 2, a transition area of 0.05mm is reserved between the ring 2 and the ring 3, and the curve of the fingertip groove in the transition area is smooth.
(3) Coating a film: and coating a photosensitive protective film on the surface of the foil workpiece, and drying in an oven at the temperature of 80 ℃ for 50 minutes.
(4) Exposure: and uniformly adsorbing the fingertip sheet substrates subjected to partition compensation on the surface of the foil workpiece coated with the photosensitive material, and exposing through ultraviolet irradiation.
(5) And (3) developing: and (3) washing the unexposed part of the foil workpiece by using a developing solution, and etching the pattern on the fingertip sheet substrate on the surface of the foil workpiece.
(6) Rotating photographic electrolytic machining of the finger tip piece: a10% KBr solution is used as an electrolyte, the processing voltage is 16v, the initial processing gap of a fingertip groove is 0.3mm, and an electrode rotates and scans at the rotating speed of 1r/min to process a fingertip sheet.
(7) Removing the protective film: and (3) putting the processed fingertip pieces into 8% NaOH solution, and removing the protective film on the surface to obtain fingertip piece workpieces.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (3)
1. An electrochemical machining method for an ultrathin finger tip sheet is characterized by comprising the following steps:
step S110: cutting a reserved clamping space of a strip-shaped foil for processing a finger tip sheet, and cleaning the surface of the cut strip-shaped foil;
step S120: drawing a processed fingertip sheet pattern in drawing software, and printing the fingertip sheet pattern on a film through a laser photoplotter to obtain a fingertip sheet substrate for photographic electrolytic processing, wherein the annular outer diameter of the fingertip sheet is phi 329mm, the inner diameter of the fingertip sheet is phi 298.5mm, the thickness of the fingertip sheet is 0.3mm, and the width of a fingertip groove is 0.3mm; dividing a fingertip groove area of a fingertip sheet bottom sheet into a plurality of annular areas concentric with the fingertip sheet, from an inner ring to an outer ring, dividing an area from phi 298.5mm to phi 318mm on the fingertip sheet bottom sheet into 3 areas from ring 1, ring 2 and ring 3, wherein a fingertip groove obliquely crosses the ring 1 to the ring 3, and reserving a transition area between two adjacent rings, wherein the fingertip groove width of the ring 1 is 0.15mm, the fingertip groove width of the ring 2 is 0.20mm, the fingertip groove width of the ring 3 is 0.25mm, a 0.5mm transition area is reserved between the ring 1 and the ring 2, and a 0.05mm transition area is reserved between the ring 2 and the ring 3; the curve of the fingertip groove in the transition region is smooth, and the partitioned compensation of the fingertip sheet negative is used for offsetting the influence of the inconsistent electrode processing speed on the width of the fingertip groove;
step S130: coating a photosensitive protective film on the surface of the foil workpiece in the step S110, and drying in an oven;
step S140: uniformly adsorbing the fingertip sheet substrate subjected to the partition compensation in the step S120 on the surface of the foil workpiece coated with the photosensitive protective film, and then exposing the fingertip sheet substrate through ultraviolet light irradiation;
step S150: washing the unexposed part of the foil workpiece by a developing solution, and etching the pattern on the fingertip sheet film on the surface of the foil workpiece;
step S160: mounting the foil workpiece after the step S150 on a fingertip sheet rotating processing device, carrying out rotating photographic electrolytic processing on the part, which is not covered with the protective film, of the foil workpiece through a rotating electrode, and processing the patterns on the bottom sheet of the fingertip sheet to the surface of the foil workpiece;
step S170: and (4) putting the processed fingertip pieces into the film removing liquid to remove the protective film, so as to obtain the final fingertip piece processing pattern.
2. The electrochemical machining method of an ultra-thin fingertip piece according to claim 1, wherein in step S160, the foil workpiece is mounted on a fingertip piece rotating machining device, the foil workpiece with a complete pattern protection film is fixed on the surface of a workbench under the action of a pressing plate, a cathode is driven by a rotating shaft to rotate at a constant speed, an anode of an electric column power supply is connected to an anode of the anode, an electric column power supply is connected to a cathode of the cathode, an electrolyte flows through a machining gap between the electrode and the workpiece through a liquid conveying pipeline, a power switch is turned on, an electric machining loop is turned on, the rotating electrode machines a bare metal area without the protection film, and finally, the pattern on the fingertip piece bottom piece is machined to the surface of the workpiece.
3. A fingertip piece rotating processing device is used for the electrochemical processing method of the ultrathin fingertip piece, which is characterized by comprising a pressing plate, a rotating electrode, an anode charging post and a cathode charging post, wherein the center of the pressing plate is a hollow area, the periphery of the pressing plate is a solid part, a foil workpiece of the fingertip piece and the hollow area are concentrically placed, a reserved clamping space of the foil is pressed under the peripheral solid part of the pressing plate, the rotating electrode is installed by taking the center of the pressing plate as the rotating center, so that the rotating electrode can rotate in the hollow area, the anode charging post is arranged on the solid part of the pressing plate, the cathode charging post and the rotating electrode are vertically arranged and electrically connected, and the cathode charging post is provided with an electrolyte channel along a central shaft and is communicated with the electrolyte channel in the rotating electrode along the fingertip radial direction.
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