Cathode device for electrolytic machining of boss structure of cartridge receiver

Abstract

The invention discloses a cathode device for an electrolytic machining case boss structure. The cathode device comprises a cathode body, a flow baffle, a connecting rod, a liquid inlet base and a connecting base. Wherein the liquid inlet seat is arranged at the lower end of the connecting seat, the cathode body is arranged below the liquid inlet seat, the connecting rod is arranged between the liquid inlet seat and the cathode body, a liquid inlet cavity is formed in the liquid inlet seat, and an inner cavity with a downward opening is formed in the cathode body; the upper end of the connecting rod is communicated with the liquid inlet cavity, and the lower end of the connecting rod is communicated with the upper end of the inner cavity; the flow baffle is arranged in the inner cavity, and a gap is formed between the periphery of the flow baffle and the cavity wall of the inner cavity. According to the cathode device, the electrolyte can uniformly flow into the machining gap, so that the machining quality of the boss structure of the cartridge receiver is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic machining, and in particular to a cathode device used for electrolytic machining of a casing boss structure. Background Art

[0002] Among aircraft engine parts, the casing is the outer shell that protects the internal structure. It is an annular part with a large diameter and relatively thin wall thickness. There are boss structures of various sizes and shapes distributed on the surface of the casing. These boss structures provide mounting points for installing and fixing other components, such as pipe joints, sensors, etc., to ensure that the relevant components can be firmly and accurately combined on the casing, thereby ensuring the normal operation and performance of the engine.

[0003] Electrolytic machining is more efficient than mechanical machining and has less labor intensity. Receiver bosses are also often processed by electrolytic machining. Electrolytic machining not only shows the advantages of stress-free deformation, strong adaptability to complex surfaces, high surface quality, and wide material applicability in the manufacture of receiver bosses, but also has the advantages of one-time molding of the outer contour of the receiver boss, and smooth transition between the processed boss structure and the outer contour of the receiver. However, the existing cathode device still has the problem of uneven flow distribution of the electrolyte in the processing of the receiver boss structure, resulting in poor processing quality. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned problems and provide a cathode device for electrolytic machining of a casing boss structure, which can achieve uniform flow of electrolyte into the machining gap, thereby improving the machining quality of the casing boss structure.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A cathode device for an electrolytic machining casing boss structure comprises a cathode body, a baffle, a connecting rod, a liquid inlet seat and a connecting seat; wherein the liquid inlet seat is arranged at the lower end of the connecting seat, the cathode body is arranged below the liquid inlet seat, the connecting rod is arranged between the liquid inlet seat and the cathode body, the liquid inlet seat is provided with a liquid inlet cavity, and the cathode body is provided with an inner cavity opening downward; the upper end of the connecting rod is connected to the liquid inlet cavity, and the lower end of the connecting rod is connected to the upper end of the inner cavity; the baffle is arranged in the inner cavity, and a gap is provided between the surrounding of the baffle and the cavity wall of the inner cavity.

[0007] The working principle of the cathode device for electrolytic machining of the casing boss structure is as follows:

[0008] When processing the boss structure of the casing, the connecting seat is connected to the machine tool, and the electrolyte flows from the liquid inlet cavity into the connecting rod, and then flows into the inner cavity of the cathode body from the lower end of the connecting rod. At this time, the electrolyte will be blocked by the baffle plate, and then the electrolyte will diffuse evenly around, and then flow out from the gap between the baffle plate and the inner cavity. Under the guidance of the gap, the electrolyte enters the processing area, and finally flows out from the gap between the outer contour surface of the cathode body and the outer surface of the casing.

[0009] In a preferred embodiment of the present invention, the upper end of the baffle plate is connected to the upper end of the inner cavity via a plurality of mounting rods. By providing the mounting rods, the upper and lower position adjustment and fixation of the baffle plate can be achieved.

[0010] Preferably, the gaps around the baffle plate and the cavity wall of the inner cavity form an annular flow channel. The purpose is that the electrolyte will be blocked by the baffle plate and then flow out from the annular flow channel, and the annular flow channel guides the electrolyte so that the electrolyte flows evenly into the processing area, thereby improving the processing quality of the casing boss structure.

[0011] Preferably, a communication port is provided at the upper end of the cathode body, the upper end of the communication port is connected to the connecting rod, and the lower end of the communication port is connected to the inner cavity of the cathode body; the communication port, the inner cavity and the baffle are coaxially arranged, so as to further ensure that the electrolyte can flow into the processing area evenly.

[0012] Preferably, the cross-sectional area of ​​the baffle is larger than the cross-sectional area of ​​the communication port. With the above structure, when the electrolyte enters the inner cavity of the cathode body from the communication port, since the cross-sectional area of ​​the baffle is larger than the cross-sectional area of ​​the communication port, the baffle can better block the electrolyte coming out of the communication port and drain it to the surroundings, so that the electrolyte can flow into the processing area along the inner cavity wall of the cathode body, thereby improving the uniformity of the electrolyte.

[0013] Preferably, the cavity wall of the inner cavity includes a top surface at the top, a molding surface at the lower end for molding the casing boss structure, and an intermediate wall surface between the top surface and the molding surface; epoxy resin glue is evenly coated on the non-processing area of ​​the outer contour of the cathode body, the top surface of the cavity wall, and the intermediate wall surface of the cavity wall. By coating epoxy resin glue, an insulating effect can be achieved, thereby ensuring processing accuracy.

[0014] Preferably, the upper end of the connecting rod is connected to the lower end of the liquid inlet seat by a threaded connection; the lower end of the connecting rod is connected to the communication port by a threaded connection; the connecting rod and the liquid inlet seat and the connecting rod and the cathode body are locked by a locking nut. The threaded connection facilitates installation and disassembly; for different shapes of casing boss structures, different shapes of cathode bodies need to be set, that is, the inner and outer contours of the cathode body change according to the shape of the casing boss structure, and the threaded connection facilitates the replacement of cathode bodies of different shapes.

[0015] Preferably, the baffle is made of insulating material, and the cross-sectional shape of the baffle corresponds to the cross-sectional shape of the inner cavity. That is, the cross-sectional shape of the baffle is proportional to the cross-sectional shape of the inner cavity, and the shapes are consistent but the sizes are different, which ensures that the width of each position of the annular flow channel is consistent and the flow field is uniform.

[0016] Preferably, the outer side surface of the connecting rod is provided with a protrusion along the circumferential direction, and the protrusion is provided with two oppositely arranged planes. In the above structure, the two sides of the protrusion are milled into mutually parallel planes, the purpose of which is to facilitate the use of tools, such as wrenches, etc., to clamp the two planes with the wrench, and operate the tool to twist the connecting rod, which is helpful for assembly.

[0017] Preferably, the liquid inlet seat is provided with four through holes and one blind hole, the through hole is a liquid inlet hole, the liquid inlet hole is connected to the liquid inlet cavity, and the blind hole is a conductive jack. The electrolyte can be transported into the liquid inlet cavity through the liquid inlet hole, and the conductive jack is used to connect a conductive column, which is connected to the negative electrode of the electrolytic power supply.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the cathode device of the present invention, when the electrolyte enters the connecting rod from the liquid inlet cavity and then enters the inner cavity of the cathode body, the electrolyte will be blocked by the baffle plate and guided to diffuse evenly around, thereby enhancing the uniformity of the flow field. Then the electrolyte flows out from the gap between the baffle plate and the inner cavity. Under the guidance of the gap, the electrolyte enters the processing area and finally flows out from the gap between the outer contour surface of the cathode body and the outer contour surface of the casing, thereby improving the quality of the casing boss structure and also improving the processing efficiency.

[0020] 2. The cathode device in the present invention can match the corresponding cathode body and baffle plate according to the different shapes of the casing boss structure, thereby improving the processing flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a cathode device used for electrolytic machining of a casing boss structure in the present invention.

[0022] Figure 2 It is a cross-sectional view of the cathode device in the present invention.

[0023] Figure 3 1 is a top view of the cathode body in the present invention.

[0024] Figure 4 for Figure 3 Cross-sectional view along the AA direction.

[0025] Figure 5It is a top view of the baffle in the present invention.

[0026] Figure 6 for Figure 5 Cross-sectional view along direction BB.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the connecting rod in the present invention.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the liquid inlet seat in the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0030] See also Figure 1-Figure 8 The present embodiment discloses a cathode device for an electrolytic machining casing boss structure, comprising a cathode body 5, a baffle plate 2, a connecting rod 3, a liquid inlet seat 4 and a connecting seat 1; wherein the liquid inlet seat 4 is arranged at the lower end of the connecting seat 1, the cathode body 5 is arranged below the liquid inlet seat 4, the connecting rod 3 is arranged between the liquid inlet seat 4 and the cathode body 5, the liquid inlet seat 4 is provided with a liquid inlet cavity 41, and the cathode body 5 is provided with an inner cavity 51 opening downward; the upper end of the connecting rod 3 is communicated with the liquid inlet cavity 41, and the lower end of the connecting rod 3 is communicated with the upper end of the inner cavity 51; the baffle plate 2 is arranged in the inner cavity 51, and a gap 6 is provided between the surrounding of the baffle plate 2 and the cavity wall of the inner cavity 51.

[0031] See also Figure 1-Figure 8 The inner cavity 51 structure of the cathode body 5 in this embodiment is designed according to the profile of the casing boss structure. The edge of the inner cavity 51 of the cathode body 5 is rounded according to the transition arc between the casing boss structure and the casing outer surface. The inner cavity 51 of the cathode body 5 is rounded according to the arc between the casing boss structure and the casing outer surface. The outer end surface of the cathode body 5 is rounded to increase the outflow speed of the electrolyte, and the electrolysis product will not accumulate here, which can effectively avoid the short circuit phenomenon in the actual electrolytic processing process.

[0032] See also Figure 1-Figure 8 The upper end of the baffle plate 2 is connected to the upper end of the inner cavity 51 by a plurality of mounting rods 7. By providing the mounting rods 7, the upper and lower position adjustment and fixation of the baffle plate 2 can be achieved.

[0033] See also Figure 1-Figure 8The gap 6 between the periphery of the baffle plate 2 and the cavity wall of the inner cavity 51 forms an annular flow channel. If the cross section of the inner cavity 51 is rectangular, the cross section of the baffle plate 2 is also rectangular, and the annular flow channel is a rectangular annular flow channel. The purpose is that the electrolyte will be blocked by the baffle plate 2 and then flow out from the annular flow channel. The annular flow channel guides the electrolyte so that the electrolyte flows evenly into the processing area, thereby improving the processing quality of the casing boss structure.

[0034] See also Figure 1-Figure 8 The upper end of the cathode body 5 is provided with a communication port 52, the upper end of the communication port 52 is connected to the connecting rod 3, and the lower end of the communication port 52 is connected to the inner cavity 51 of the cathode body 5; the communication port 52, the inner cavity 51 and the baffle 2 are all coaxially arranged (coaxially), so as to further ensure that the electrolyte can flow into the processing area evenly.

[0035] See also Figure 1-Figure 8 , the cross-sectional area of ​​the baffle plate 2 is larger than the cross-sectional area of ​​the communication port 52. With the above structure, when the electrolyte enters the inner cavity 51 of the cathode body 5 from the communication port 52, since the cross-sectional area of ​​the baffle plate 2 is larger than the cross-sectional area of ​​the communication port 52, the baffle plate 2 can better block the electrolyte coming out of the communication port 52 and drain it to the surroundings, so that the electrolyte can flow into the processing area along the wall of the inner cavity 51 of the cathode body 5, thereby improving the uniformity of the electrolyte.

[0036] The cross section is the cross section in the horizontal direction, and the cross-sectional area is the cross-sectional area in the horizontal direction.

[0037] See also Figure 1-Figure 8 , the area of ​​the gap between the surrounding of the baffle plate 2 and the cavity wall of the inner cavity 51 is smaller than the area of ​​the connecting port 52. The purpose is to ensure that sufficient electrolyte flows into the area between the baffle plate 2 and the connecting port 52, and then ensure that the electrolyte can flow into the processing area evenly and sufficiently from the gap between the surrounding of the baffle plate 2 and the cavity wall of the inner cavity 51, thereby enhancing the uniformity of the flow field and quickly taking away the heat.

[0038] See also Figure 1-Figure 8 The cavity wall of the inner cavity 51 includes a top surface 511 at the top, a molding surface 512 at the lower end for molding the casing boss structure, and an intermediate wall surface 513 between the top surface 511 and the molding surface 512; in order to avoid stray corrosion, the cathode body 5 needs to be insulated; the outer contour non-processing area 514 of the cathode body 5, the top surface 511 of the cavity wall, and the intermediate wall surface 513 of the cavity wall are uniformly coated with epoxy resin glue 8; the epoxy resin glue 8 is transparent epoxy resin glue 8. By coating the epoxy resin glue 8, an insulating effect can be achieved, thereby ensuring the processing accuracy.

[0039] See also Figure 1-Figure 8The cathode body 5 is made of brass, and its shape is set according to the contour of the casing boss structure to be processed, and the inner cavity 51 is connected to the baffle 2 through the mounting rod 7. If the outer contour non-processing area 514 (i.e., the outer wall) of the cathode body 5 has no insulating layer, that is, the epoxy resin glue 8 is not coated, during the electrolytic processing, as the cathode body 51 is continuously fed, the side wall of the casing boss structure is always subjected to the stray dissolution of the cavity wall of the inner cavity 51 of the cathode body 5 opposite thereto, which will cause the side wall of the casing boss structure to dissolve seriously and deform greatly. Therefore, the outer contour non-processing area 514 of the cathode body 5 and the non-processing area of ​​the cavity wall are insulated with epoxy resin.

[0040] See also Figure 1-Figure 8 The outer contour non-processing area 514 of the cathode body 5, the top surface 511 of the cavity wall and the middle wall surface 513 of the cavity wall are provided with grooves, the depth of the grooves is the same as the height (thickness) of the epoxy resin glue 8, and the epoxy resin glue 8 is applied in the grooves. Ensure that the epoxy resin surface is flush with the molding surface 512, so as to ensure that the electrolyte flows more evenly.

[0041] See also Figure 1-Figure 8 The upper end of the baffle plate 2 is provided with a rounded corner so as to better introduce the electrolyte into the gap 6.

[0042] See also Figure 1-Figure 8 The upper end of the connecting rod 3 is connected to the lower end of the liquid inlet seat 4 by a threaded connection; the lower end of the connecting rod 3 is connected to the communication port 52 by a threaded connection; the connecting rod 3 and the liquid inlet seat 4 and the connecting rod 3 and the cathode body 5 are locked by a locking nut 9. The threaded connection facilitates installation and disassembly; for different shapes of the casing boss structure, it is necessary to set a cathode body 5 of different shapes, that is, the inner and outer contours of the cathode body 5 are changed according to the shape of the casing boss structure, and the threaded connection facilitates the replacement of cathode bodies 5 of different shapes.

[0043] See also Figure 1-Figure 8 The baffle plate 2 is made of insulating material, and the cross-sectional shape of the baffle plate 2 corresponds to the cross-sectional shape of the inner cavity 51. That is, the cross-sectional shape of the baffle plate 2 is proportional to the cross-sectional shape of the inner cavity 51, and the shapes are consistent but the sizes are different, which ensures that the width of each position of the annular flow channel is consistent and the flow field is uniform.

[0044] See also Figure 1-Figure 8 A baffle 2 is arranged in the inner cavity 51 of the cathode body 5. For casing boss structures of different shapes, cathode bodies 5 of different shapes need to be designed. According to the shape of the inner cavity 51 of the cathode body 5 and the requirement of uniform and stable flow field in the processing area, a suitable baffle 2 is arranged to guide the electrolyte to evenly enter the processing gap.

[0045] See also Figure 1-Figure 8, the mounting rod 7 is a countersunk screw, and the head of the countersunk screw is coated with epoxy resin glue for insulation. The baffle plate 2 is provided with a step hole, and one end of the four countersunk screws passes through the four step holes respectively and is connected to the four step holes (countersunk holes), and the other end is connected to the cathode body 5 through the threaded hole on the top of the inner cavity 51 of the cathode body 5. The structural dimensions and edge angles of the baffle plate 2 correspond to the dimensions of the inner cavity 51 of the cathode body 5 to ensure uniform electrolyte diversion. The position of the countersunk screw can be adjusted by the countersunk screw, and then the height position of the baffle plate 2 can be adjusted, thereby improving the processing flexibility.

[0046] See also Figure 1-Figure 8 The connecting rod 3 is made of stainless steel. The middle part of the connecting rod 3 is a hollow structure, which is a flow channel. The electrolyte flowing in from the liquid inlet cavity 41 flows into the inner cavity 51 of the cathode body 5 through the flow channel of the connecting rod 3. The outer side surface of the connecting rod 3 is provided with a protrusion 10 along the circumferential direction. The protrusion 10 is provided with two oppositely arranged planes. In the above structure, the two sides of the protrusion 10 are milled into mutually parallel planes, the purpose of which is to facilitate the use of tools, such as a wrench, etc., and the two planes are clamped with the wrench. The connecting rod 3 can be screwed by operating the tool, which is helpful for assembly.

[0047] See also Figure 1-Figure 8 The connection seat 1 and the liquid inlet seat 4 are sealed by a sealing rubber ring 11. The liquid inlet seat 4 is provided with four through holes and a blind hole. The through hole is a liquid inlet hole 42, and the liquid inlet hole 42 is connected to the liquid inlet cavity 41. The blind hole is a conductive plug 43. The electrolyte can be transported to the liquid inlet cavity 41 through the liquid inlet hole 42. The conductive plug 43 is used to connect a conductive column, and the conductive column is connected to the negative electrode of the electrolytic power supply.

[0048] See also Figure 1-Figure 8 The material of the liquid inlet seat 4 is brass. The upper end of the liquid inlet seat 4 is fixedly connected to the connecting seat 1 by screws, and a sealing rubber ring 11 is embedded to achieve sealing. The lower end of the liquid inlet seat 4 is a threaded hole connected to the connecting rod 3. The liquid inlet hole 42 is connected to the electrolyte inlet pipe through a quick-change plug, so that the electrolyte pressurized by the pressure pump flows into the liquid inlet cavity 41. The conductive jack 43 is a threaded hole, and the conductive column is a screw. The conductive column is connected to the wire to connect the negative electrode of the electrolytic power supply.

[0049] See also Figure 1-Figure 8 The working principle of the cathode device for electrolytic machining of the casing boss structure is as follows:

[0050] When the boss structure of the casing is processed, the connecting seat 1 is connected to the machine tool, and the electrolyte flows from the liquid inlet cavity 41 into the connecting rod 3, and then flows from the lower end of the connecting rod 3 into the inner cavity 51 of the cathode body 5. At this time, the electrolyte will be blocked by the baffle plate 2, and then the electrolyte will diffuse evenly around, and then flow out from the gap between the baffle plate 2 and the inner cavity 51. Under the guidance of the gap, the electrolyte enters the processing area (processing gap), and finally flows out from the gap between the outer contour surface of the cathode body 5 and the outer surface of the casing.

[0051] In this embodiment, the electrolyte is allowed to flow evenly into the processing gap by setting the cavity wall (molding surface 512) of the inner cavity 51 of the cathode body 5, adding a guide baffle, and adjusting the processing gap and the height of the insulating layer (epoxy resin glue 8).

[0052] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A cathode device for electrolytic machining of a casing boss structure, characterized in that: It includes a cathode body, a baffle, a connecting rod, a liquid inlet seat and a connecting seat; wherein the liquid inlet seat is arranged at the lower end of the connecting seat, the cathode body is arranged below the liquid inlet seat, the connecting rod is arranged between the liquid inlet seat and the cathode body, the liquid inlet seat is provided with a liquid inlet cavity, and the cathode body is provided with an inner cavity opening downward; the upper end of the connecting rod is connected to the liquid inlet cavity, and the lower end of the connecting rod is connected to the upper end of the inner cavity; the baffle is arranged in the inner cavity, and a gap is provided between the surrounding of the baffle and the cavity wall of the inner cavity.

2. The cathode device according to claim 1, characterized in that The upper end of the baffle plate is connected to the upper end of the inner cavity through a plurality of mounting rods.

3. The cathode device according to claim 1, characterized in that The gap between the periphery of the baffle plate and the cavity wall of the inner cavity forms an annular flow channel.

4. The cathode device according to claim 3, characterized in that A communication port is provided at the upper end of the cathode body, the upper end of the communication port is communicated with the connecting rod, and the lower end of the communication port is communicated with the inner cavity of the cathode body; the communication port, the inner cavity and the baffle are all coaxially arranged.

5. The cathode device according to claim 4, characterized in that The cross-sectional area of ​​the baffle plate is larger than the cross-sectional area of ​​the communication port.

6. The cathode device according to claim 1, characterized in that The cavity wall of the inner cavity includes a top surface at the top, a molding surface at the lower end for molding the casing boss structure, and an intermediate wall surface between the top surface and the molding surface; epoxy resin glue is evenly coated on the non-processing area of ​​the outer contour of the cathode body, the top surface of the cavity wall, and the intermediate wall surface of the cavity wall.

7. The cathode device according to claim 4, characterized in that The upper end of the connecting rod is connected to the lower end of the liquid inlet seat by a thread; the lower end of the connecting rod is connected to the communication port by a thread; the connecting rod and the liquid inlet seat and the connecting rod and the cathode body are locked by a locking nut.

8. The cathode device according to claim 3, characterized in that The baffle is made of insulating material, and the cross-sectional shape of the baffle corresponds to the cross-sectional shape of the inner cavity.

9. The cathode device according to claim 1, characterized in that The outer side surface of the connecting rod is provided with a protrusion along the circumferential direction, and the protrusion is provided with two oppositely arranged planes.

10. The cathode device according to claim 1, characterized in that The liquid inlet seat is provided with four through holes and a blind hole, wherein the through holes are liquid inlet holes, the liquid inlet holes are connected with the liquid inlet cavity, and the blind hole is a conductive jack.

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