Special-shaped sealing groove combined machining device and machining method

Abstract

The invention discloses a special-shaped sealing groove combined machining device and method, and belongs to the technical field of aero-engine part machining, the special-shaped sealing groove combined machining device comprises a high-speed electric spark electrode and a forming electric spark mechanism, and a clamping mechanism comprises a base, a supporting piece, a supporting piece, a rotary pressing plate and a limiting pressing strip; a plurality of second limiting grooves are formed in the two opposite sides of the supporting piece in the transverse direction at intervals, the rotary pressing plate is used for rotating to the limiting pressing strip and pressing and limiting the limiting pressing strip, and the supporting piece is used for covering the tops of the second limiting grooves and limiting the end, facing the top of the supporting piece, of the limiting pressing strip; the supporting piece is further used for guiding and limiting the displacement of the high-speed electric spark electrode through the side edge of the supporting piece. According to the machining device, the multiple fan-shaped section products are synchronously clamped through the clamping mechanism, combined machining is conducted through high-speed electric sparks and forming electric sparks, the advantage that the high-speed electric sparks are high in material removal rate is utilized, the characteristic that the forming electric sparks are high in machining precision is combined, and the machining problem of deep narrow grooves can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of aero-engine part processing, and in particular, to a special-shaped seal groove composite processing device. In addition, the present application also relates to a processing method including the above special-shaped seal groove composite processing device. Background Art

[0002] The information provided in this part is for the purpose of generally presenting the background of the present application. To the extent described in this part, the work of the currently named inventors and aspects that may not constitute the prior art described at the time of filing are neither expressly nor implicitly considered to be the prior art of the present application.

[0003] To avoid the impact and performance loss caused by the reverse flow of cold and hot gases and gas leakage in an aero-engine, the sealing structure of the outer ring of the engine turbine and the guide vane mostly adopts a seal groove sealing structure. Please refer to the attached Figure 2 figure, which is an annular sealing structure member with a seal groove. The seal groove structure generally has the following characteristics: the seal groove structure presents a certain special shape along with the outer ring structure, rather than the common hole or groove type; the seal groove structure is generally a deep and narrow groove structure, with a width generally below 1 mm and a depth-width ratio generally above 5 times, making the processing very difficult.

[0004] Currently, most of the seal groove processing methods use thin tungsten-copper electrodes (please refer to the attached Figure 4 ) for processing. The traditional processing method has the following two problems:

[0005] 1. The processing time is long. For example, a single turbine outer ring consists of 10 sector segments, and 2 seal grooves are processed at the cross-section of each sector segment. A total of 20 clamping and processing operations are required. In this working condition, the processing time of one turbine outer ring requires 40 hours, which has become a bottleneck process for this product.

[0006] 2. The tungsten-copper electrode has large losses and is prone to deformation. It is difficult to align and tool the electrode during the processing. The electrode profile belongs to a special-shaped profile, and it is not easy to find the deformation of the electrode after deformation, resulting in dimensional tolerance. When tooling, only visual trial cutting can be used for tooling, with a high risk of tolerance. Moreover, the copper electrode has large losses. Due to the inconsistent discharge environment at each deep and narrow groove, the loss difference is large, resulting in over-tolerance of the processing depth. The combined factors make it difficult to further improve the qualification rate of this process.

[0007] It should be noted that the information disclosed in the above background art part is only used to enhance the understanding of the background of the present application. Therefore, it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0008] In view of at least one of the above technical problems, the present application provides a special-shaped seal groove composite machining device and a machining method, which can synchronously clamp multi-segment fan-shaped products through a clamping mechanism, and utilize the composite machining of high-speed electric discharge machining and profiling electric discharge machining. By taking advantage of the high material removal rate of high-speed electric discharge machining and combining the characteristics of high-precision machining of profiling electric discharge machining, the machining problem of deep and narrow grooves can be solved.

[0009] Meanwhile, the present application also provides a machining method using the above special-shaped seal groove composite machining device.

[0010] According to one aspect of the present application, there is provided a special-shaped seal groove composite machining device, including a profiling electric discharge machining mechanism for machining a seal groove on an annular seal member. The annular seal member includes multiple fan-shaped segments. The special-shaped seal groove composite machining device further includes a clamping mechanism for clamping the fan-shaped segments. The clamping mechanism includes a base, a support member, a supporting member, a rotating pressing plate, and a limiting pressing strip:

[0011] The support member is supported on the base. Multiple second limiting grooves are spaced apart horizontally on both opposite sides of the support member. The rotating pressing plate is rotatably arranged beside the second limiting grooves. At least one rotating pressing plate is correspondingly provided for a single second limiting groove. The limiting pressing strip is used to press the fan-shaped segment tightly in the second limiting groove. The rotating pressing plate is used to rotate onto the limiting pressing strip and press the limiting pressing strip tightly for limitation. The supporting member is arranged on the top of the support member. The supporting member is used to cover the top of the second limiting groove and limit one end of the limiting pressing strip facing the top of the support member. The supporting member is further used to guide and limit the displacement of the high-speed electric discharge machining electrode through its side.

[0012] In some embodiments of the present application, multiple layers of limiting bosses are spaced vertically on both opposite sides of the support member. Multiple second limiting grooves are arranged in a row on each layer of limiting bosses, and multiple rotating pressing plates are arranged in a row on the limiting bosses.

[0013] In some embodiments of the present application, the rotating pressing plate includes a body, and a protruding portion is arranged on the body. The clamping mechanism further includes a second locking member. The second locking member passes through a preset through hole on the body and is connected to a preset screw hole on the limiting boss. The body is used to drive the protruding portion to rotate onto the limiting pressing strip and press the limiting pressing strip tightly in the second limiting groove through the protruding portion.

[0014] In some embodiments of the present application, the profiling electric discharge machining mechanism includes a reference sheet interface, a graphite electrode, and a positioning block. The reference sheet interface is arranged on the top of the positioning block. The reference sheet interface is used to externally connect to a machine tool processing device. Two clamping grooves are spaced apart at the bottom of the positioning block. Two graphite electrodes are correspondingly arranged in the two clamping grooves. A reference point is arranged on the top of the support member. The positioning block is used to align the reference point through the reference sheet interface and drive the graphite electrode to machine a seal groove on the end face of the fan-shaped segment under the drive of the machine tool processing device.

[0015] In some embodiments of the present application, the profiling EDM mechanism further includes a locking member. The locking member passes through the locking screw hole on the side wall of the positioning groove, presses against the graphite electrode and limits it within the positioning groove.

[0016] In some embodiments of the present application, the graphite electrode includes an electrode body and electrode pieces arranged on the electrode body. The electrode pieces are used for machining a sealing groove on the end face of the sector segment.

[0017] In some embodiments of the present application, the electrode pieces are arranged in one-to-one correspondence with the second limiting grooves. The distance between the electrode pieces in the positioning grooves on both sides is the same as the width of the supporting member. The electrode pieces are used to abut against the side wall of the supporting member for positioning and calibration.

[0018] According to another aspect of the present application, there is also provided a method for compound machining of a special-shaped sealing groove, which uses the above-mentioned special-shaped sealing groove compound machining device. The method for compound machining of a special-shaped sealing groove includes the following steps:

[0019] S100: Press the sector segment of the annular sealing member tightly in the second limiting groove through the limiting strip, and rotate the rotating pressing plate to press and limit the limiting strip and the sector segment in the second limiting groove;

[0020] S200: Use a high-speed EDM electrode to first machine a pre-hole at the sealing groove on the end face of the sector segment;

[0021] S300: Use the profiling EDM mechanism to finish machining the pre-hole in the sector segment into a sealing groove.

[0022] In some embodiments of the present application, in step S200, the preset width of the sealing groove is K mm, the depth is H mm, the diameter of the high-speed EDM electrode is Φ(K - 0.2) mm, the preset step distance of the high-speed EDM electrode is (K - 0.2) mm, the hole diameter is Φ(K - 0.1) ± 0.05 mm, and the depth of the hole is H mm. The pre-holes are machined in sequence.

[0023] In some embodiments of the present application, in step S300, the profiling EDM mechanism uses a graphite electrode to machine a sealing groove for the pre-hole with a width of K mm and a depth of H mm.

[0024] The present application has the following beneficial effects:

[0025] The special-shaped seal groove composite machining device of the present application can quickly and synchronously clamp multiple sector segments through the clamping mechanism, enabling the machining of multiple sector segments together and greatly improving the machining efficiency. The relative two sides of the support member of the clamping mechanism are both arranged with multiple second limiting grooves, which can limit multiple sector segments simultaneously, and the sector segments are clamped by the limiting pressing strip. Subsequently, the limiting pressing strip and the sector segments are clamped and limited in the second limiting groove by rotating the rotating pressing plate, realizing the stable clamping of the sector segments, avoiding the deformation of the sector segments caused by directly abutting and pressing them, affecting the machining quality, and facilitating the subsequent stable machining of the seal groove. And the composite machining of the seal groove is carried out by the high-speed electric discharge electrode and the forming electric discharge mechanism. Utilizing the advantage of high material removal rate of the high-speed electric discharge electrode, the machining allowance is quickly removed; combined with the characteristics of high-precision machining of the precision forming electric discharge, the machining accuracy of the special-shaped seal groove is guaranteed, realizing high-efficiency and high-quality machining.

[0026] The special-shaped seal groove composite machining method of the present application also has the above beneficial effects. It also includes being able to quickly clamp the sector segments through the rotating pressing plate, first machining the pre-hole through the high-speed electric discharge electrode, and then finely machining and forming the seal groove through the forming electric discharge mechanism. Through the composite machining method, effectively avoid phenomena such as deformation of the parts during machining, synchronously carry out high-precision seal groove machining on multiple sector segments, and effectively improve the machining quality and efficiency.

[0027] Of course, it is not necessary for any product implementing the present application to achieve all the above-mentioned advantages simultaneously. In addition to the purposes, features, and advantages described above, the present application has other purposes, features, and advantages. The following will refer to the drawings to further elaborate on the present application in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0029] Figure 1 is a schematic diagram of the overall structure of the clamping mechanism of the preferred embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the annular seal structure member of the existing engine turbine outer ring and guide vane;

[0031] Figure 3 is a schematic diagram of the seal groove of the existing seal structure member;

[0032] Figure 4 is a schematic diagram of the existing thin tungsten-copper electrode;

[0033] Figure 5Schematic diagram of clamping the sector segment of the preferred embodiment of the present application onto the clamping mechanism;

[0034] Figure 6 Schematic diagram of the structure of the support member of the preferred embodiment of the present application;

[0035] Figure 7 Schematic diagram of machining the pre - hole of the preferred embodiment of the present application;

[0036] Figure 8 Schematic diagram of the shape of the pre - hole of the preferred embodiment of the present application;

[0037] Figure 9 Schematic diagram after machining the pre - hole on the sector segment of the preferred embodiment of the present application;

[0038] Figure 10 Enlarged schematic diagram at position A of the preferred embodiment of the present application;

[0039] Figure 11 Schematic diagram of the installation of the graphite electrode of the preferred embodiment of the present application;

[0040] Figure 12 Schematic diagram of the arrangement of the electrode plates of the preferred embodiment of the present application;

[0041] Figure 13 Schematic diagram of the structure of the positioning plate of the preferred embodiment of the present application;

[0042] Figure 14 Schematic diagram of the sealing groove formed by machining on the sector segment of the preferred embodiment of the present application.

[0043] Legend: 100, annular sealing member; 101, sector segment; 200, high - speed electric - discharge electrode; 300, electric - discharge forming mechanism; 301, reference piece interface; 302, graphite electrode; 3021, electrode plate; 303, positioning block; 3031, clamping groove; 304, locking member; 305, positioning plate; 3051, first limiting groove; 306, rotating pressing block; 307, first locking member; 308, bottom plate; 1, base; 2, support member; 21, limiting boss; 22, second limiting groove; 3, supporting member; 4, rotating pressing plate; 5, limiting bar; 6, positioning pin; 7, second locking member. Detailed implementation manners

[0044] The following will describe the embodiments of the present application in detail with reference to the accompanying drawings. However, the present application can be implemented in many different ways defined and covered by the following.

[0045] Figure 1 Schematic diagram of the overall structure of the clamping mechanism of the preferred embodiment of the present application; Figure 2 Schematic diagram of the existing annular sealing structure of the engine turbine outer ring and guide vanes;Figure 3 It is a schematic diagram of the sealing groove of an existing sealing structure member; Figure 4 It is a schematic diagram of an existing thin tungsten-copper electrode; Figure 5 It is a schematic diagram of clamping a sector segment of a preferred embodiment of the present application onto a clamping mechanism; Figure 6 It is a schematic diagram of the structure of a support member of a preferred embodiment of the present application; Figure 7 It is a schematic diagram of machining a pre-hole in a preferred embodiment of the present application; Figure 8 It is a schematic diagram of the shape of the pre-hole in a preferred embodiment of the present application; Figure 9 It is a schematic diagram after machining the pre-hole on the sector segment of a preferred embodiment of the present application; Figure 10 It is an enlarged schematic diagram at position A of a preferred embodiment of the present application; Figure 11 It is a schematic diagram of the installation of a graphite electrode in a preferred embodiment of the present application; Figure 12 It is a schematic diagram of the arrangement of electrode plates in a preferred embodiment of the present application; Figure 13 It is a schematic diagram of the structure of a positioning plate in a preferred embodiment of the present application; Figure 14 It is a schematic diagram of the machined sealing groove on the sector segment of a preferred embodiment of the present application.

[0046] A special-shaped sealing groove composite machining device includes a forming electric discharge machining mechanism 300 for machining a sealing groove on an annular sealing member 100. The annular sealing member 100 includes multiple sector segments 101. The special-shaped sealing groove composite machining device further includes a clamping mechanism for clamping the sector segment 101. The clamping mechanism includes a base 1, a support member 2, a supporting member 3, a rotating pressing plate 4, and a limiting pressing strip 5:

[0047] The support member 2 is supported on the base 1. Multiple second limiting grooves 22 are arranged at intervals along the transverse direction on both opposite sides of the support member 2. The rotating pressing plate 4 is rotatably arranged beside the second limiting groove 22. At least one rotating pressing plate 4 is correspondingly arranged for a single second limiting groove 22. The limiting pressing strip 5 is used to press the sector segment 101 tightly in the second limiting groove 22. The rotating pressing plate 4 is used to rotate onto the limiting pressing strip 5 and press and limit the limiting pressing strip 5. The supporting member 3 is arranged on the top of the support member 2. The supporting member 3 is used to cover the top of the second limiting groove 22 and limit one end of the limiting pressing strip 5 facing the top of the support member 2. The supporting member 3 is further used to guide and limit the displacement of the high-speed electric discharge electrode 200 through its side.

[0048] Here, the meaning of "supporting member 2" refers to a structure that is supported on the base 1 and used to limit and fix the segment 101. In some embodiments, the supporting member 2 is a plate-like structure, and multi-layered limiting bosses 21 are provided on opposite sides of the supporting member 2. Second limiting grooves 22 are arranged in an array on the limiting bosses 21. The second limiting grooves 22 are arc-shaped structures to stably limit the segment 101, and the second limiting grooves 22 of each layer of limiting bosses 21 correspond to each other to perform multi-segment clamping on the segment 101. A positioning pin 6 is provided on the supporting member 2 to play a role in accurate positioning or facilitating external connection to machine tools.

[0049] The special-shaped seal groove composite machining device of the present application quickly synchronously clamps multiple segments of the segment 101 through a clamping mechanism, realizes the machining of multiple segments of the segment 101 together, and greatly improves the machining efficiency. Among them, multiple second limiting grooves 22 are arranged in an array on opposite sides of the supporting member 2 of the clamping mechanism, which can simultaneously limit multiple segments of the segment 101, and the segment 101 is pressed by a limiting pressing strip 5. Subsequently, the limiting pressing strip 5 and the segment 101 are pressed and limited in the second limiting grooves 22 by rotating the rotating pressing plate 4, realizing the stable clamping of the segment 101, avoiding the deformation of the segment 101 caused by directly abutting and pressing the segment 101, affecting the machining quality, and facilitating subsequent stable machining of the seal groove. And the composite machining of the seal groove is carried out by a high-speed electric discharge electrode 200 and a profiling electric discharge mechanism 300. Utilizing the advantage of the high material removal rate of the high-speed electric discharge electrode 200, the machining allowance is quickly removed; combined with the characteristics of high-precision machining of precision profiling electric discharge, the machining accuracy of the special-shaped seal groove is guaranteed, and high-efficiency and high-quality machining is realized.

[0050] Preferably, please refer to Figure 1 、 5 As shown in 6, multi-layered limiting bosses 21 are arranged at intervals in the vertical direction on opposite sides of the supporting member 2. Multiple second limiting grooves 22 are arranged in an array on each layer of limiting bosses 21, and multiple rotating pressing plates 4 are arranged on the limiting bosses 21.

[0051] It can be understood that multi-segment clamping of the segment 101 can be realized through the second limiting grooves 22 on the multi-layered limiting bosses 21, and the gap between each layer of limiting bosses 21 facilitates the operator to manually hold the segment 101 for disassembly and assembly, and facilitates the manual sliding of the segment 101 to adjust the position, so as to quickly adjust the segment 101 to fit the supporting member 2 and coincide with the positioning center of the arc-shaped second limiting grooves 22, facilitating subsequent pressing and limiting of the segment 101 by the rotating pressing plate 4.

[0052] Preferably, please refer to Figure 1 、 5, as shown in FIGS. 6, the rotating pressing plate 4 includes a body, and a convex portion is provided on the body. The clamping mechanism further includes a second locking member 7. The second locking member 7 passes through a preset through hole on the body and is connected to a preset screw hole on the limiting boss 21. The body is used to drive the convex portion to rotate onto the limiting pressing strip 5 and press the limiting pressing strip 5 tightly in the second limiting groove 22 through the convex portion.

[0053] It can be understood that by tightening the second locking member 7, the rotating pressing plate 4 can be locked and fixed on the limiting boss 21, and after loosening the second locking member 7, the rotating pressing plate 4 can be rotated, so that the rotating pressing plate 4 can be quickly adjusted, and by changing the convex portion of the rotating pressing plate 4, the limiting pressing strip 5 can be pressed or released.

[0054] Optionally, the second locking member 7 is a bolt or an internal hexagonal screw, which is convenient for adjusting the position of the second locking member 7 and is also convenient for the procurement, maintenance and replacement of the second locking member 7.

[0055] It should be noted that the limiting pressing strip 5 is an arc-shaped plate structure, and the fan-shaped section 101 has an arc-shaped groove structure. By clamping the limiting pressing strip 5 into the arc-shaped groove, the fan-shaped section 101 can be stably and evenly pressed and limited, reducing stress concentration. And by pressing the limiting pressing strip 5 with the rotating pressing plate 4, it is avoided to directly abut against the fan-shaped section 101, causing collision damage and pressing deformation, which is beneficial to ensuring the stability of the parts and smoothly machining the sealing groove, and improving the machining accuracy and quality.

[0056] Preferably, please refer to Figures 11 - 13 , as shown, the forming EDM mechanism 300 includes a reference plate interface 301, a graphite electrode 302 and a positioning block 303. The reference plate interface 301 is arranged on the top of the positioning block 303. The reference plate interface 301 is used to externally connect the machine tool processing equipment. Two clamping grooves 3031 are spaced apart at the bottom of the positioning block 303. Two graphite electrodes 302 are respectively arranged in the two clamping grooves 3031. A reference point is arranged on the top of the support member 2. The positioning block 303 is used to align the reference point through the reference plate interface 301 and drive the graphite electrode 302 to machine the sealing groove on the end face of the fan-shaped section 101 under the drive of the machine tool processing equipment.

[0057] It can be understood that the positioning block 303 functions as an electrode positioning chuck. By providing two clamping grooves 3031 at the bottom of the positioning block 303, the spaced arrangement of the graphite electrodes 302 is realized. Cooperating with the fact that both opposite sides of the support member 2 can clamp the fan-shaped section 101, the graphite electrodes 302 on both sides can synchronously machine the fan-shaped sections 101 on both sides, achieving the effect of batch processing.

[0058] It should be noted that the reference plate interface 301 here is a 3R reference plate. As a fast positioning structure, it can realize the fast positioning and replacement of the electrode between different processing equipment, reduce the manual alignment time, and is beneficial to improving the production efficiency.

[0059] Preferably, please refer to Figures 11 - 13 As shown, the molding EDM mechanism 300 further includes a locking member 304. The locking member 304 passes through the locking screw hole on the side wall of the clamping groove 3031 and then presses against the graphite electrode 302 to limit it within the clamping groove 3031.

[0060] It can be understood that the installation position of the graphite electrode 302 can be conveniently adjusted through the locking member 304, and the disassembly and assembly of the graphite electrode 302 are facilitated to adapt to different processing conditions.

[0061] Optionally, the locking member 304 is a bolt or an internal hexagonal screw, which is convenient to adjust the position of the locking member 304 through common tools and then adjust the graphite electrode 302.

[0062] Preferably, please refer to Figure 12 As shown, the graphite electrode 302 includes an electrode body and electrode plates 3021 arranged on the electrode body. The electrode plates 3021 are used to machine sealing grooves on the end face of the segment 101.

[0063] In this preferred embodiment, the electrode plates 3021 are arranged in one-to-one correspondence with the second limiting grooves 22. The distance between the electrode plates 3021 in the clamping grooves 3031 on both sides is the same as the width of the supporting member 3. The electrode plates 3021 are used to abut against the side walls of the supporting member 3 for limiting and calibration.

[0064] It can be understood that the arranged electrode plates 3021 can synchronously machine multiple arranged segments 101. By arranging the electrode plates 3021 in one-to-one correspondence with the second limiting grooves 22, the accuracy of the machining position of the electrode plates 3021 is ensured. At the same time, the supporting member 3 can play a role in limiting and calibrating the electrode plates 3021 on both sides. The opposite sides of the electrode plates 3021 on both sides of the positioning block 303 can abut against the side walls of the supporting member 3 for calibration to improve the position accuracy of the electrode plates 3021, thereby ensuring the quality of the machining of the sealing grooves.

[0065] In some embodiments, the profiling EDM mechanism 300 further includes a positioning plate 305, a rotating pressing block 306, and a bottom plate 308. The positioning plate 305 is supported on the bottom plate 308. The positioning plate 305 has a flat plate structure, which can reduce the manufacturing difficulty of the positioning plate 305. First limiting grooves 3051 are arranged in opposite sides of the positioning plate 305 in an array, and the first limiting grooves 3051 are used for limiting the sector segment 101. A rotatable rotating pressing block 306 is connected beside the first limiting groove 3051 through a first locking member 307. The rotating pressing block 306 has the same structure as the rotating pressing plate 4. The first locking member 307 uses a bolt or an internal hexagonal screw. By setting a reference point at the top of the positioning plate 305 for the positioning block 303 to perform positioning, the use of the supporting member 3 can be cancelled, and then through multiple replacements, the overall structure of the profiling EDM mechanism 300 can be simplified, and the manufacturing and maintenance costs can be reduced.

[0066] According to another aspect of the present application, there is also provided a method for compound machining of a special-shaped seal groove, which uses the above-mentioned special-shaped seal groove compound machining device. The method for compound machining of a special-shaped seal groove includes the following steps:

[0067] S100. Press the sector segment 101 of the annular seal member 100 against the second limiting groove 22 through the limiting pressing strip 5, and rotate the rotating pressing plate 4 to press and limit the limiting pressing strip 5 and the sector segment 101 in the second limiting groove 22;

[0068] S200. Use the high-speed EDM electrode 200 to first machine a pre-hole at the end face seal groove of the sector segment 101;

[0069] S300. Use the profiling EDM mechanism 300 to finish machining the pre-hole of the sector segment 101 into a seal groove.

[0070] Preferably, in step S200, the preset width of the seal groove is K mm, the depth is H mm, the diameter of the high-speed EDM electrode 200 is ΦK - 0.2 mm, the high-speed EDM electrode 200 has a preset step distance of (K - 0.2) mm, the hole diameter is Φ(K - 0.1) ± 0.05 mm, and the depth of the hole is H mm, and the pre-holes are machined in sequence.

[0071] It can be understood that if the step distance is too large, there will be too much residual allowance of the part, and the subsequent profiling EDM machining time will be long; while if the step distance is too small, there will be too many machining points, and the high-speed drilling time will be too long. Therefore, finally, the machining points are obtained according to the step distance of (K - 0.2) mm to ensure the machining effect of the pre-hole and meet the requirements of machining efficiency.

[0072] It should be noted that the actual size of the pre-hole machining is not detected to reduce the detection process and improve the overall machining efficiency. Since the diameter of the high-speed electric discharge electrode 200 for drilling plus the discharge gap is smaller than the final size of the seal groove width, and at the same time the drilling depth plus the discharge gap is smaller than the final size of the groove depth, there is sufficient margin after the pre-hole machining, and there is no need to detect the actual size of the pre-hole again.

[0073] Preferably, in step S300, the forming electric discharge mechanism 300 uses the graphite electrode 302 to machine the seal groove in the pre-hole with a width of K mm and a depth of H mm. Since the graphite electrode 302 is not easily deformed, based on the pre-hole, the high-precision characteristics of precision forming electric discharge machining can be used to effectively ensure the machining quality of the seal groove.

[0074] The composite machining method for the special-shaped seal groove of the present application also has the above beneficial effects. It also includes being able to quickly clamp the sector segment 101 through the rotating pressing plate 4, first machining the pre-hole through the high-speed electric discharge electrode 200, and then finely machining and forming the seal groove through the forming electric discharge mechanism 300. By means of composite machining, taking advantage of the high material removal rate of high-speed electric discharge machining, the machining allowance can be quickly removed; combined with the characteristics of high-precision machining of forming electric discharge, the machining accuracy of the special-shaped seal groove is ensured, and phenomena such as deformation of the part during machining can be effectively avoided. The clamping mechanism can clamp multiple sector segment 101 products at the same time and synchronously machine the high-precision seal grooves of multiple sector segments 101, effectively improving both the machining quality and efficiency.

[0075] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0076] Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above examples is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limitation of literal expression and objectively existing infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements, refinements or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. A composite processing device for special-shaped sealing grooves, comprising a forming electric spark mechanism (300) for processing sealing grooves on an annular sealing member (100), wherein the annular sealing member (100) comprises a plurality of fan-shaped segments (101), characterized in that: The composite processing device for special-shaped sealing grooves also includes a clamping mechanism for clamping the fan-shaped segment (101), the clamping mechanism including a base (1), a support member (2), a support member (3), a rotating pressure plate (4) and a limiting pressure strip (5): The support member (2) is supported on the base (1), and a plurality of second limiting grooves (22) are provided at intervals along the horizontal direction on opposite sides of the support member (2). The rotary pressing plate (4) is rotatably arranged beside the second limiting groove (22), and at least one rotary pressing plate (4) is correspondingly arranged for each second limiting groove (22). The limiting pressure strip (5) is used to press the fan-shaped segment (101) into the second limiting groove (22), and the rotary pressing plate (4) is used to rotate onto the limiting pressure strip (5) and press the limiting pressure strip (5) to limit the position. The supporting member (3) is arranged on the top of the support member (2), and the supporting member (3) is used to cover the top of the second limiting groove (22) and limit one end of the limiting pressure strip (5) toward the top of the support member (2). The supporting member (3) is also used to guide and limit the displacement of the high-speed electric spark electrode (200) through its side.

2. The composite processing device for special-shaped sealing grooves according to claim 1, characterized in that: Multiple layers of limiting bosses (21) are arranged at intervals along the vertical direction on opposite sides of the support member (2), and multiple second limiting grooves (22) are arranged on each layer of the limiting bosses (21). Multiple rotating pressure plates (4) are arranged on the limiting bosses (21).

3. The composite processing device for special-shaped sealing grooves according to claim 2, characterized in that: The rotating pressure plate (4) comprises a main body, on which a protrusion is arranged, and the clamping mechanism further comprises a second locking member (7), which passes through a preset through hole on the main body and is connected to a preset screw hole on the limiting boss (21), and the main body is used to drive the protrusion to rotate onto the limiting pressure strip (5) and to press the limiting pressure strip (5) into the second limiting groove (22) through the protrusion.

4. The composite processing device for special-shaped sealing grooves according to claim 1, characterized in that: The forming electric spark mechanism (300) comprises a reference piece interface (301), a graphite electrode (302) and a positioning block (303). The reference piece interface (301) is arranged at the top of the positioning block (303). The reference piece interface (301) is used for connecting to an external machine tool processing device. Two positioning grooves (3031) are arranged at intervals at the bottom of the positioning block (303). Two graphite electrodes (302) are arranged in the two positioning grooves (3031) in a one-to-one correspondence. A reference point is arranged at the top of the support member (2). The positioning block (303) is used for aligning the reference point through the reference piece interface (301) and driving the graphite electrode (302) to process a sealing groove on the end surface of the sector segment (101) under the drive of the machine tool processing device.

5. The composite processing device for special-shaped sealing grooves according to claim 4, characterized in that: The forming electric spark mechanism (300) also includes a locking member (304), which passes through a locking screw hole on the side wall of the locking groove (3031) to tighten the graphite electrode (302) and limit it in the locking groove (3031).

6. The device for composite processing of special-shaped sealing grooves according to claim 4, characterized in that: The graphite electrode (302) comprises an electrode body and an electrode sheet (3021) arranged on the electrode body. The electrode sheet (3021) is used for machining a sealing groove on the end face of the sector segment (101).

7. The device for composite processing of special-shaped sealing grooves according to claim 6, characterized in that: The electrode sheets (3021) are arranged in one-to-one correspondence with the second limiting grooves (22); the distance between the electrode sheets (3021) in the locking grooves (3031) on both sides is consistent with the width of the supporting member (3); the electrode sheets (3021) are used to abut against the side wall of the supporting member (3) for limiting and calibration.

8. A composite processing method for special-shaped sealing grooves, characterized in that: Using the composite processing device for special-shaped sealing grooves according to any one of claims 1 to 8, the composite processing method for special-shaped sealing grooves comprises the following steps: S100, pressing the sector (101) of the annular sealing member (100) into the second limiting groove (22) by means of the limiting pressure strip (5), and rotating the rotary pressing plate (4) to press the limiting pressure strip (5) and the sector (101) into the second limiting groove (22); S200, using a high-speed electric spark electrode (200) to firstly process a pre-hole at the end face sealing groove of the sector segment (101); S300, using a forming electric spark mechanism (300) to finely process the pre-hole of the sector (101) into a sealing groove.

9. A composite processing method for special-shaped sealing grooves according to claim 8, characterized in that: In step S200, the width of the sealing groove is preset to be Kmm and the depth is preset to be Hmm, the diameter of the high-speed electric spark electrode (200) is Φ(K-0.2)mm, the high-speed electric spark electrode (200) is preset to have a step distance of (K-0.2)mm, a hole diameter of Φ(K-0.1)±0.05mm, and a hole depth of Hmm, and pre-hole processing is performed in sequence.

10. The composite processing method of special-shaped sealing groove according to claim 8, characterized in that: In step S300, the forming electric spark mechanism (300) uses a graphite electrode (302) to process a sealing groove with a width of Kmm and a depth of Hmm on the pre-hole.

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