A method for processing ultra-long spray holes for use in large cylindrical compressors

Abstract

This invention relates to a method for machining extra-long spray holes on large cylindrical compressors, addressing the problem that existing spray hole machining methods are unsuitable for machining spray holes on large cylindrical compressors. The steps of this invention are as follows: Step 1, assemble the cylindrical compressor and mark the relative positions of the outer casing, inner casing, inlet end cover, and exhaust end cover during assembly; Step 2, place the outer casing on a boring machine table, and rotate the boring machine table circumferentially by the required angle of the spray hole according to the machining requirements; Step 3, machine the spray holes using a boring machine with a special punch, a special roughing milling cutter, and a special finishing milling cutter; After the spray holes are machined, assemble the outer casing, inner casing, inlet end cover, and exhaust end cover according to the relative positions marked in Step 1, thus completing the machining of the spray holes on the cylindrical compressor.

Description

Technical Field

[0001] This invention relates to a cylindrical compressor, and more specifically to a method for processing ultra-long spray holes applied to a large cylindrical compressor. Background Technology

[0002] The cylindrical compressor has external dimensions of 3400mm in length, 3000mm in width, and 3000mm in height. The working medium is coke oven gas. The compressor stator consists of an inner casing and an outer casing. To prevent condensation of the coke oven gas medium within the flow channel during operation, the cylindrical compressor is designed with eight spray devices. These spray devices extend from the outer casing through the inner casing to the airflow channel via spray holes, with a maximum length of approximately 530mm. The flushing pipes in the spray devices must be inserted from the outer casing into the inner casing and into the airflow channel. Technically, the nozzles in the spray devices must be aligned with the conical flushing holes installed in the inner cylinder flow channel. The minimum diameter of the flushing holes is Φ22mm, and the outer diameter of the flushing pipe is Φ21.3mm.

[0003] This type of spraying device is being used for the first time in a cylindrical compressor. The machining accuracy of the mounting holes for the corresponding spraying devices on the inner and outer cylinders is very high. If the machining accuracy of the mounting holes is poor, the spraying device will not be able to be installed and used normally.

[0004] In terms of manufacturing process, to ensure the alignment of the spray holes on the inner and outer casings, a simultaneous machining method is usually adopted. However, from a structural design perspective, there is a closed cavity between the inner and outer casings, and the spray holes are a segmented structure. Simultaneous machining would prevent the removal of shavings generated during processing. This could lead to scratches on the mating surfaces or jamming of the inner and outer casings during subsequent disassembly. Therefore, the simultaneous machining method for the spray holes on the inner and outer casings is not feasible. Consequently, a reliable machining method is currently lacking to avoid these problems. Summary of the Invention

[0005] This invention provides a method for processing ultra-long spray holes in large cylindrical compressors, which solves the problem that existing spray hole processing methods are not suitable for processing spray holes on large cylindrical compressors.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A method for processing ultra-long spray holes for large cylindrical compressors, characterized by the following steps:

[0008] Step 1: Assemble the cartridge compressor and mark the relative positions of the outer casing, inner casing, intake end cover, and exhaust end cover during assembly.

[0009] Step 2: Place the outer casing on the boring machine worktable after it has been aligned and leveled. Then, rotate the boring machine worktable circumferentially to the corresponding angle according to the machining requirements of the spray hole angle.

[0010] Step 3: The spray holes are machined using a boring machine with a special punch, a special roughing milling cutter, and a special finishing milling cutter.

[0011] After the spray holes are machined, they are assembled according to the relative positions of the outer casing, inner casing, air inlet cover, and exhaust cover marked in step 1, thus completing the machining of the spray holes of the cylindrical compressor.

[0012] Furthermore, step 1 is detailed as follows:

[0013] Step 1.1: Assemble the inner casing and the exhaust end cover, and mark the relative position lines of the inner casing and the exhaust end cover when they are assembled together;

[0014] Step 1.2: Install the inner casing and exhaust end cover together into the outer casing. The exhaust end cover and the outer casing are connected together by the connecting plate inside the outer casing to form the stator, ensuring that the inner casing does not move.

[0015] Mark the relative position lines when the exhaust end cap and the outer casing are assembled together;

[0016] Step 1.3: Assemble the air inlet end cover and the outer casing together to form a cylindrical compressor;

[0017] Mark the relative positions of the intake end cover and the outer housing, and record the axial clearance values ​​between the intake end cover, the outer housing, the inner housing, and the exhaust end cover for subsequent assembly alignment.

[0018] Step 1.4: Draw a cross center line on the outer casing and the air intake end cover for subsequent machining alignment of the outer casing.

[0019] Furthermore, step 2 is detailed as follows:

[0020] Place leveling pads on the boring machine worktable, and position the outer casing on the leveling pads with the air inlet end cap in place, ensuring that the outer casing is in a horizontal state;

[0021] The boring machine is aligned and the center of the circle is found by referring to the cross center line drawn in step 1.4, so that the center line of the worktable on the boring machine coincides with the center line of the outer casing, and the boring machine spindle is orthogonal to the outer circle of the cylindrical compressor to be machined on the worktable;

[0022] The worktable on the boring machine rotates circumferentially to process the angle corresponding to the spray hole according to the processing requirements of the spray hole angle. The circumferential position line of the spray hole is drawn on the outer circle of the outer casing near the end face and extends to the exhaust end cover.

[0023] Furthermore, step 3 is detailed below:

[0024] Step 3.1: Disassemble the cylindrical compressor formed in step 1.3;

[0025] Step 3.2: The outer casing is positioned on the worktable of the boring machine with the exhaust end cover in place, and the boring machine spindle is orthogonal to the outer circle of the outer casing to be machined on the worktable. The worktable is rotated by the angle of the spray hole to be machined, so that the boring machine spindle is aligned with the position of the spray hole. The boring machine uses the end face as a reference to determine the axial position of the spray hole by moving coordinates, and machines part of the spray hole on the outer casing.

[0026] Step 3.3: Use a special punch, a special roughing milling cutter, and a special finishing milling cutter to machine some of the spray holes on the inner housing, thus completing the machining of the spray holes.

[0027] Furthermore, step 3.1 is detailed as follows:

[0028] First, remove the intake end cover and extend the cross center line on the outer casing to the end face of the inner casing;

[0029] Next, remove the connecting plate between the exhaust end cover and the outer casing, and pull out the inner casing and exhaust end cover.

[0030] Furthermore, step 3.3 is detailed below:

[0031] Step 3.3.1: The inner housing is positioned on the boring machine table with the exhaust end cover in place, so that the center line of the inner housing coincides with the center line of the boring machine table, and the boring machine spindle is orthogonal to the worktable. The position of the spray hole opening on the upper part of the inner housing is determined according to the extension line of the spray hole on the exhaust end cover and the coordinates on the boring machine. A small flat surface is machined at the opening position to facilitate the determination of the center position of the spray hole on the upper part of the inner housing with a special punch.

[0032] Step 3.3.2: Based on the position marks drawn by the relative position lines of the outer casing, inner casing, air inlet end cover and exhaust end cover when they are assembled together in step 1, reassemble the inner casing, outer casing, air inlet end cover and exhaust end cover, and place them on the worktable of the boring machine with the exhaust end cover in position.

[0033] Based on the partially sprayed holes on the completed outer casing, use a special punch to mark a center point on the plane of the inner casing through the partially sprayed holes on the outer casing. This center point is the center point of the partially sprayed holes on the inner casing. Ensure that the center point is located at the center of the small plane on the inner casing, with an error of ≤1mm.

[0034] Step 3.3.3: Remove the inner casing and, according to the position of the center point, use a special roughing milling cutter and a special finishing milling cutter to process the other part of the spray holes on the inner casing in sequence;

[0035] After the processing is completed, the inner casing is reinstalled, and the processing of the spray holes is finally completed.

[0036] Furthermore, the roughing milling cutter includes a straight bar section and a cutter segment, the cutter segment including a straight cutter section and a slanted cutter section; the slanted cutter section is a truncated cone shape, and the taper of the slanted cutter section is consistent with the angle of the front end of the spray hole;

[0037] The finishing milling cutter includes a straight bar section and a cutter segment. The cutter segment includes a straight cutter section and a slanted cutter section. The slanted cutter section is a truncated cone shape, and the taper of the slanted cutter section is consistent with the angle of the spray hole.

[0038] The diameter and length of the straight section, the diameter of the straight cutter section, the large end diameter of the bevel section, the taper of the bevel, and the length of the bevel diameter in the roughing milling cutter are all equal to those in the finishing milling cutter. The small end diameter of the bevel section in the roughing milling cutter is smaller than that in the finishing milling cutter.

[0039] Furthermore, the diameter of the straight section of the roughing milling cutter is 30mm, the length is 75mm, and the length of the cutter segment is 75mm. The cutter segment includes a straight section and a bevel section. The diameter of the straight section is 30mm. The bevel section is a truncated cone shape with a diameter of 30mm at the large end and a diameter of 16mm at the small end. The angle between the bevel taper and the front end of the spray hole is 25°, and the bevel diameter is 15mm.

[0040] The straight section of the finishing milling cutter has a diameter of 30mm and a length of 75mm, and the cutter segment has a length of 75mm. The cutter segment includes a straight section and a bevel section. The diameter of the straight section is 30mm. The bevel section is a truncated cone shape with a diameter of 30mm at the large end and a diameter of 21mm at the small end. The bevel taper is consistent with the angle of the spray hole, which is 25°. The bevel diameter is 15mm.

[0041] Furthermore, the special gun includes a striking end, a straight rod section, and a conical section arranged sequentially from back to front.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] The application of this technology optimizes the machining process of ultra-long segmented spray holes for large cylindrical compressors based on existing technology. By designing special punches, rough milling cutters, and finish milling cutters, the machining accuracy of the spray holes is improved. The marking lines ensure that the spray device and spray holes are installed successfully on the first attempt. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the spray device structure in an embodiment of the present invention.

[0045] Figure 2 This is a schematic diagram of the structure in an embodiment of the present invention, showing the connection between the outer casing and the exhaust end cover via a connecting plate.

[0046] Figure 3 This is a schematic diagram of the spray hole structure on the outer casing in an embodiment of the present invention.

[0047] Figure 4 This is a schematic diagram of the structure of the inner casing in an embodiment of the present invention.

[0048] Figure 5 for Figure 4 A cross-sectional view of the MM section.

[0049] Figure 6 This is a schematic diagram of the structure of the special gun used to process the spray hole design in an embodiment of the present invention.

[0050] Figure 7 for Figure 6 A magnified view of a section at point I.

[0051] Figure 8 This is a schematic diagram of the structure of the special roughing milling cutter corresponding to the roughing spray hole in an embodiment of the present invention.

[0052] Figure 9 This is a schematic diagram of the special finishing milling cutter corresponding to the finishing spray hole in an embodiment of the present invention.

[0053] The reference numerals in the attached figures are as follows:

[0054] 1. Outer casing, 2. Inner casing, 3. Inlet end cover, 4. Exhaust end cover, 5. Spray device, 6. Spray hole, 7. Seamless steel pipe, 8. Flow channel, 9. Connecting plate. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0056] This invention provides a method for processing ultra-long spray holes applied to large cylindrical compressors, used for processing such as... Figures 1-5 The spray holes in the spray device shown.

[0057] The stator of a large cylindrical compressor includes an outer casing 1, an inner casing 2, an inlet end cover 3, and an outlet end cover 4. After assembling the outer casing 1, inner casing 2, inlet end cover 3, and outlet end cover 4, multiple spray holes 6 need to be machined from the outside of the outer casing 1 into the flow channel inside the inner casing 2, such as... Figure 3 As shown, some of the spray holes in the outer casing 1 are through holes, such as... Figure 5As shown, another part of the spray holes in the inner casing 2 includes through holes and tapered holes connected in sequence. The tapered holes must cooperate with the spray nozzles of the spray device 5 to ensure that gas in the flow channel does not leak through the spray holes. At the same time, the spray device 5 sprays liquid into the flow channel 8 through the spray holes 6 to flush away the fixed condensates in the flow channel 8. Seamless steel pipes 7 are used to transport the liquid in the spray device 5.

[0058] The spray nozzle processing requires the use of, for example Figure 6 The special punch shown is used to mark the location of another set of spray holes on the inner housing 2 after the inner housing 2 and outer housing 1 are installed, using the portion of spray holes machined on the outer housing 1 as a reference. The specific process is as follows: after the portion of the spray holes on the outer housing 1 is machined, the special punch is inserted into that portion of the spray holes on the outer housing 1, and the striking end of the special punch is struck with a hammer, leaving a mark on the surface of the inner housing 2 with its conical tip, facilitating the machining of the other portion of the spray holes on the inner housing 2; for example... Figure 7 The special roughing milling cutter shown is Figure 8 The special finishing milling cutter shown is used to machine the tapered hole part of the spray hole on the inner housing 2. The special roughing milling cutter and finishing milling cutter are designed according to the tapered hole structure. The two tools have the same structural outline but different dimensions.

[0059] The special gun consists of a striking end, a straight rod section, and a conical section arranged from back to front, with the tip of the conical section being polished.

[0060] The roughing milling cutter includes a straight section with a diameter of 30mm and a length of 75mm, and a cutting section with a length of 75mm. The cutting section includes a straight cutting section and a bevel cutting section. The diameter of the straight cutting section is 30mm. The bevel cutting section is a truncated cone shape with a diameter of 30mm at the large end and a diameter of 16mm at the small end. The bevel taper is consistent with the angle of the front end of the spray hole, which is 25°. The bevel diameter is 15mm.

[0061] The finishing milling cutter includes a straight section with a diameter of 30mm and a length of 75mm, and a cutting section with a length of 75mm. The cutting section includes a straight cutting section and a bevel cutting section. The diameter of the straight cutting section is 30mm. The bevel cutting section is a truncated cone shape with a diameter of 30mm at the large end and a diameter of 21mm at the small end. The bevel taper is consistent with the angle of the spray hole, which is 25°. The bevel diameter is 15mm.

[0062] The specific steps for processing the spray nozzles are as follows:

[0063] Step 1: Assemble and mark the relative positions of the inner casing 2, outer casing 1, intake end cover 3, and exhaust end cover 4.

[0064] Step 1.1: Assemble the inner casing 2 and the exhaust end cover 4, and mark the relative position lines of the inner casing 2 and the exhaust end cover 4 when they are assembled together.

[0065] Step 1.2: The inner casing 2 and the exhaust end cover 4, which are installed together, are inserted into the outer casing 1 as a whole. The exhaust end cover 4 and the outer casing 1 are connected together by the connecting plate 9 inside the outer casing 1 to form a stator component, ensuring that the inner casing 2 does not move.

[0066] At this point, mark the relative position lines when the exhaust end cover 4 and the outer casing 1 are assembled together.

[0067] The assembled stator is positioned on the worktable of the boring machine with the exhaust end cover 4 in place. Ensure that the air inlet and exhaust outlet on the inner casing 2 and the outer casing 1 are aligned and that the misalignment of the air inlet and exhaust outlet meets the requirements. Then, assemble the air inlet end cover 3 with the outer casing 1 to form a cylindrical compressor.

[0068] Mark the relative positions of the intake end cover 3 and the outer casing 1, and record the axial clearance values ​​between the intake end cover 3, the outer casing 1, the inner casing 2, and the exhaust end cover 4 for subsequent assembly alignment.

[0069] Step 1.3: Draw cross center lines on the outer casing 1 and the air inlet end cover 3 for alignment during machining of the outer casing 1.

[0070] Step 2, Pre-processing

[0071] A leveling shim is placed on the boring machine's worktable. The outer casing 1 is positioned on the leveling shim with the air inlet end cover 3 in place, ensuring that the outer casing 1 is horizontal. The boring machine is aligned with the center line of the crosshair, ensuring that the center line of the boring machine's worktable coincides with the center line of the outer casing 1, and that the boring machine spindle is orthogonal to the outer circle of the cylindrical compressor to be machined on the worktable. The worktable is rotated according to the machining requirements of the spray hole angle, and the circumferential position line of the spray hole is drawn on the outer circle of the outer casing 1 near the end face, extending to the exhaust end cover 4.

[0072] Step 3, begin processing

[0073] Step 3.1: Remove the intake end cover 3 and extend the cross center line on the outer casing 1 to the end face of the inner casing 2. Remove the exhaust end cover 4 from the connecting plate 9 on the outer casing 1, and pull out the inner casing 2 and the exhaust end cover 4.

[0074] Step 3.2: The outer casing 1 is positioned on the worktable of the boring machine with the exhaust end face as the positioning point. The outer casing 1 is aligned with the worktable of the boring machine to ensure that the spindle of the boring machine is orthogonal to the outer circle of the outer casing 1 to be machined on the worktable. The worktable is rotated to the angle of the spray hole to be machined so that the spindle of the boring machine is aligned with the position of the spray hole. The boring machine uses the end face as the reference to determine the axial position of the spray hole by moving the coordinates and machines part of the spray hole on the outer casing 1.

[0075] Step 3.3: The inner housing 2 is positioned on the worktable of the boring machine with the exhaust end cover in place, so that the center line of the inner housing 2 coincides with the center line of the boring machine worktable, ensuring that the boring machine spindle is orthogonal to the worktable. The position of the spray hole opening on the upper part of the inner housing 2 is determined according to the extension line of the spray hole on the exhaust end cover 4 and the coordinates on the boring machine. A plane is machined at the opening position to facilitate the use of a special punch to determine the center of the spray hole on the upper part of the inner housing 2.

[0076] Step 3.4: Based on the position marks drawn according to the relative contact lines of the outer casing 1, inner casing 2, air inlet end cover 3, and exhaust end cover 4 when they are assembled together in Step 1, reassemble the inner casing 2, outer casing 1, air inlet end cover 3, and exhaust end cover 4, with the exhaust end cover 4 placed on the worktable of the boring machine. Based on the partial spray holes on the already machined outer casing 1, mark a center point on the plane of the inner casing 2 by passing a special punch through the partial spray holes on the outer casing 1. This center point is the center point of the partial spray holes on the inner casing 2, and ensure that the center point is located at the center of the small plane on the inner casing 2, with an error ≤1mm.

[0077] Step 3.5: Remove the inner casing 2, and use a special roughing milling cutter and a special finishing milling cutter to machine some of the spray holes on the inner casing according to the center point position.

[0078] Specialized roughing and finishing milling cutters are mounted on a boring machine via tapered shanks. The boring machine drives the specialized roughing and finishing milling cutters to machine the spray holes.

[0079] After the processing is completed, the inner casing 2 is reinstalled, and the processing of the spray holes is finally completed.

Claims

1. A method for processing ultra-long spray holes applied to large cylindrical compressors, characterized in that, The steps are as follows: Step 1: Assemble the cartridge compressor and mark the relative positions of the outer casing (1), inner casing (2), inlet end cover (3), and exhaust end cover (4) during assembly; Step 2: Place the outer casing (1) on the boring machine worktable after it is aligned and leveled. Then, rotate the boring machine worktable in the circumferential direction of the spray hole processing position according to the processing requirements of the spray hole angle. Step 2 is as follows: Place a leveling pad on the boring machine worktable, and position the outer casing (1) on the leveling pad with the air inlet end cap (3) to ensure that the outer casing (1) is in a horizontal state; The boring machine is aligned by marking the center line of the cross, so that the center line of the worktable on the boring machine coincides with the center line of the outer casing (1), and the boring machine spindle is orthogonal to the outer circle of the cylindrical compressor to be machined on the worktable; The worktable on the boring machine rotates in the circumferential direction to process the angle corresponding to the spray hole according to the processing requirements of the spray hole angle. The circumferential position line of the spray hole is drawn on the outer circle of the outer casing (1) near the end face and extends to the exhaust end cover (4). Step 3: The spray holes (6) are machined using a boring machine with a special punch, a special roughing milling cutter and a special finishing milling cutter. After the spray hole (6) is processed, it is assembled according to the relative positions of the outer casing (1), inner casing (2), air inlet end cover (3) and exhaust end cover (4) marked in step 1, and the processing of the spray hole of the cylindrical compressor is finally completed. Step 3 is as follows: Step 3.1, disassemble the cartridge compressor; First, remove the air intake end cover (3) and extend the cross center line on the outer casing (1) to the end face of the inner casing (2); Remove the connecting plate (9) on the exhaust end cover (4) and the outer casing (1), and pull out the inner casing (2) and the exhaust end cover (4); Step 3.2, the outer casing (1) is positioned on the worktable of the boring machine with the exhaust end cover (4) in place, and the spindle of the boring machine is orthogonal to the outer circle of the outer casing (1) to be machined on the worktable. The worktable is rotated by the angle of the spray hole to be machined, so that the spindle of the boring machine is aligned with the position of the spray hole. The boring machine uses the end face as the reference to determine the axial position of the spray hole by moving coordinates, and machines part of the spray hole on the outer casing (1). Step 3.3: Use a special punch, a special roughing milling cutter, and a special finishing milling cutter to machine some of the spray holes on the inner housing, and finally complete the machining of the spray holes; Step 3.3 is as follows: Step 3.3.1: The inner housing (2) is positioned on the boring machine worktable with the exhaust end cover (4) so ​​that the center line of the inner housing (2) coincides with the center line of the boring machine worktable, ensuring that the boring machine spindle is orthogonal to the worktable. The position of the spray hole opening on the upper part of the inner housing (2) is determined according to the extension line of the spray hole on the exhaust end cover (4) and the coordinates on the boring machine. A small flat surface is machined at the opening position to facilitate the determination of the center position of the spray hole on the upper part of the inner housing (2) by a special gun. Step 3.3.2: According to the position marks drawn by the relative position lines of the outer casing (1), inner casing (2), air inlet end cover (3) and exhaust end cover (4) when they are assembled together in step 1, reassemble the inner casing (2), outer casing (1), air inlet end cover (3) and exhaust end cover (4), and place the exhaust end cover (4) on the worktable of the boring machine. Based on the partial spray holes on the outer casing (1) that has been processed, use a special gun to mark a center point on the plane of the inner casing (2) through the partial spray holes on the outer casing (1). This center point is the center point of the partial spray holes on the inner casing (2), and ensure that the center point is located at the center of the small plane on the inner casing (2), with an error of ≤1mm. Step 3.3.3: Remove the inner casing (2) and use a special roughing milling cutter and a special finishing milling cutter to process the other part of the spray holes on the inner casing (2) according to the position of the center point. After the processing is completed, the inner casing (2) is reinstalled, and the processing of the spray holes is finally completed.

2. The processing method for ultra-long spray holes applied to large cylindrical compressors according to claim 1, characterized in that, Step 1 is as follows: Step 1.1: Assemble the inner casing (2) and the exhaust end cover (4), and mark the relative position lines of the inner casing (2) and the exhaust end cover (4) when they are assembled together; Step 1.2: The inner casing (2) and the exhaust end cover (4) installed together are inserted into the outer casing (1). The exhaust end cover (4) and the outer casing (1) are connected together by the connecting plate (9) to form a stator component, ensuring that the inner casing (2) does not move. Mark the relative position lines of the exhaust end cap (4) and the outer casing (1) when they are assembled together; Step 1.3: Assemble the air inlet end cover (3) and the outer casing (1) together to form a cylindrical compressor; Mark the relative position lines of the intake end cover (3) and the outer housing (1) in contact with each other, and record the axial clearance values ​​between the intake end cover (3), the outer housing (1), the inner housing (2) and the exhaust end cover (4) for subsequent assembly alignment; Step 1.4: Draw a cross center line on the outer casing (1) and the air inlet end cover (3) for subsequent machining alignment of the outer casing (1).

3. The processing method for ultra-long spray holes applied to large cylindrical compressors according to claim 2, characterized in that: The roughing milling cutter includes a straight section and a cutting section. The cutting section includes a straight cutting section and a slanted cutting section. The slanted cutting section is a truncated cone shape, and the taper of the slanted cutting section is consistent with the angle of the front end of the spray hole. The finishing milling cutter includes a straight bar section and a cutter segment. The cutter segment includes a straight cutter section and a slanted cutter section. The slanted cutter section is a truncated cone shape, and the taper of the slanted cutter section is consistent with the angle of the spray hole. The diameter and length of the straight section, the diameter of the straight cutter section, the large end diameter of the bevel section, the taper of the bevel, and the length of the bevel diameter in the roughing milling cutter are all equal to those in the finishing milling cutter. The small end diameter of the bevel section in the roughing milling cutter is smaller than that in the finishing milling cutter.

4. The processing method for ultra-long spray holes applied to large cylindrical compressors according to claim 3, characterized in that: The roughing milling cutter has a straight section with a diameter of 30mm and a length of 75mm, and a cutter segment with a length of 75mm. The cutter segment includes a straight section and a bevel section. The straight section has a diameter of 30mm. The bevel section is a truncated cone shape with a large end diameter of 30mm and a small end diameter of 16mm. The bevel taper and the angle between the bevel and the front end of the spray hole are both 25°, and the bevel diameter is 15mm. The straight section of the finishing milling cutter has a diameter of 30mm and a length of 75mm, and the cutter segment has a length of 75mm. The cutter segment includes a straight section and a bevel section. The diameter of the straight section is 30mm. The bevel section is a truncated cone shape with a diameter of 30mm at the large end and a diameter of 21mm at the small end. The bevel taper is consistent with the angle of the spray hole, which is 25°. The bevel diameter is 15mm.

5. The processing method for ultra-long spray holes applied to large cylindrical compressors according to claim 4, characterized in that: The special gun includes a striking end, a straight rod section, and a conical section arranged sequentially from back to front.

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