Rocket engine injector ring turning tool and machining method

Abstract

The invention discloses a rocket engine injector ring turning tool and machining method.The tool comprises a base, a center shaft, a pressing ring, a pressing plate, a first nut, a second nut and a bolt; wherein one end of the central shaft is connected with the middle part of the base; one end of the base is connected with a machine tool fixture; the center shaft penetrates through the center of the thin-wall plate of the injector ring to be machined; the first nut is connected with the other end of the central shaft, and the first nut is pressed against the other side of the thin-wall plate of the injector ring to be machined; the center of the compression ring sleeves the other end of the central shaft; the second nut is connected with the other end of the central shaft, the second nut is pressed against the pressing ring, and the pressing ring presses the inner side of the thin-wall plate of the injector ring to be machined; the pressing plate is connected with the base through a bolt, and the pressing plate presses the outer side of the thin-wall plate of the injector ring to be machined. According to the method, the deformation of the injector ring can be controlled in the machining process, the tool is simple in structure and practical, and the batch quality of products is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing of rocket engine thin-walled rings, and in particular relates to a turning tool and a processing method for a rocket engine injector ring. Background Art

[0002] The rocket engine injector is an important part of the engine thrust chamber, mainly used to organize the distribution, atomization and mixing of the propellant, and to ensure the stable combustion of the propellant according to the required mixing ratio. The injector includes an injector disk and 15 injector rings in an annular structure. In order to ensure the brazing gap between the injector disk and the ring, the inner and outer diameters of each ring and the inner and outer diameters of the injector disk ring groove must be guaranteed to be within 0~0.1mm, and the cylindricity must be guaranteed to be within 0.1mm. The injector ring diameter is φ22.5mm~φ392.5mm, the injector ring thickness is 3.5mm, and two rows of injection holes are evenly distributed on the ring surface. The inner and outer diameters and cylindricity of the injector ring play a vital role in the assembly of the injector and the combustion of the engine thrust chamber, directly determining the welding quality of the engine injector and affecting the flight conditions of the engine.

[0003] The injector ring is made of a circular thin-walled plate and then the inner and outer diameters of the injector ring are matched according to the measured values ​​of the corresponding ring grooves of the injector disk to ensure that the clearance between the disk and the ring is no more than 0.1mm. The maximum outer diameter of the injector ring is close to φ400 and the thickness is 3.5mm. Conventional lathe processing generally uses four-claw clamping to clamp the outer diameter of the injector ring and cut it along the axial direction of the ring to ensure the wall thickness of the ring. After cutting, the inner and outer diameters and cylindricity of the injector ring will be deformed and out of tolerance due to the cutting force, affecting the product quality. In addition, only the injector rings of the same specification can be cut each time. Injector rings of different specifications need to be realigned on the lathe before cutting, which is not conducive to complete set processing. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a rocket engine injector ring turning tool and processing method, which can control the deformation of the injector ring during the processing, ensure the tolerance requirements such as diameter size and roundness, and meet the subsequent assembly and brazing requirements of the product. The tool structure is simple and practical, and the batch quality of the product is guaranteed.

[0005] The object of the present invention is achieved by the following technical solutions: A turning tooling for a rocket engine injector ring, comprising: a base, a central shaft, a pressing ring, a pressing plate, a first nut, a second nut and a bolt; wherein, one end of the central shaft is connected to the middle of the base; one end of the base is connected to a machine tool fixture; the center of the thin-walled plate of the injector ring to be processed passes through the central shaft so that one side plane of the thin-walled plate of the injector ring to be processed is attached to the other end of the base; the first nut is connected to the other end of the central shaft, and the first nut presses against the other side of the thin-walled plate of the injector ring to be processed; the center of the pressing ring is sleeved on the other end of the central shaft; the second nut is connected to the other end of the central shaft, the second nut presses against the pressing ring, and the pressing ring presses against the inner side of the thin-walled plate of the injector ring to be processed; wherein, the pressing ring is located between the first nut and the second nut; the pressing plate is connected to the base through the bolt, and the pressing plate presses against the outer side of the thin-walled plate of the injector ring to be processed.

[0006] In the above-mentioned turning tooling for a rocket engine injector ring, the number of the pressing plates is multiple, and the multiple pressing plates are evenly distributed along the circumferential direction of the base.

[0007] In the above-mentioned turning tooling for a rocket engine injector ring, the base is a disc, and multiple rings of annular grooves are formed on the disc surface for avoiding the turning tool when the product is turned into a ring.

[0008] In the above-mentioned turning tooling for a rocket engine injector ring, the central shaft is connected to the base by a thread.

[0009] In the above-mentioned turning tooling for a rocket engine injector ring, the pressing plate is a rectangular plate, and an opening groove is formed at the center of the plate body of the pressing plate for installing the bolt.

[0010] In the above-mentioned turning tooling for a rocket engine injector ring, the side of the pressing plate where the opening groove is formed is arc-shaped, and the arc diameter is larger than the maximum outer diameter of the injector ring obtained by processing the thin-walled plate of the injector ring to be processed.

[0011] In the above-mentioned turning tooling for a rocket engine injector ring, a convex platform is arranged at the bottom of the other side of the pressing plate, and the convex platform is in contact with the thin-walled plate of the injector ring to be processed.

[0012] In the above-mentioned turning tooling for a rocket engine injector ring, the thickness of the convex platform is the same as the thickness of the thin-walled plate of the injector ring to be processed.

[0013] In the above-mentioned turning tooling for a rocket engine injector ring, a through hole is formed at the center of the base, the through hole is an internal threaded hole with a taper, and one end of the central shaft is threadedly connected to the through hole.

[0014] A processing method for the injector ring using a turning tool for the injector ring of a rocket engine, comprising:

[0015] Install the central axis on the base, pass the center of the thin-walled plate of the injector ring to be processed through the central axis so that one side plane of the thin-walled plate of the injector ring to be processed fits against one side of the base, and fix the thin-walled plate of the injector ring to be processed through the first nut installed on the central axis;

[0016] Install the pressure ring on the central axis through the second nut so that the pressure ring presses against the inner side of the thin-walled plate of the injector ring to be processed;

[0017] Install the pressing plate at the position of the bolt hole reserved on the base through bolts, and by tightening the bolts, make the pressing plate press against the outer side of the part to be cut of the thin-walled plate of the injector ring to be processed;

[0018] Turn each injector ring in sequence from the largest to the smallest according to the size of each injector ring. Among them, when turning, first cut off the outer diameter of the largest injector ring along the axial direction and process the outer diameter dimension in place, then use the pressing plate to press the side of the largest injector ring surface close to the outer circle, and finally cut off the inner diameter of the largest injector ring and process the inner diameter dimension in place. After removing the largest injector ring, use the pressure ring to press the next injector ring, repeat the above operations, cut off the outer diameter and inner diameter of the next injector ring until each injector ring is cut off.

[0019] The present invention has the following beneficial effects compared with the prior art:

[0020] (1) The turning tool for the injector disk ring of the rocket engine of the present invention can realize the clamping and turning of the thin-walled parts of the injector ring; the turning tool has a simple and durable structure, convenient clamping, solves the problem of cutting deformation of large-diameter thin-walled rings, and ensures the product quality;

[0021] (2) The present invention adopts the processing method of the turning tool for the injector ring with matching turning, avoiding the problems of out-of-tolerance machining of diameter and cylindricity caused by the deformation of the entire injector ring; solves the problem of matching turning between the injector disk and the injector ring, and the tool clamping and alignment method is simple and convenient, and can accurately and efficiently complete the matching turning of the injector ring. Description of the Drawings

[0022] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the turning tool for the injector ring of the rocket engine provided by the embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the base provided by an embodiment of the present invention;

[0025] Figure 3 is Figure 2 a sectional view taken along line A-A in

[0026] Figure 4 It is a schematic structural diagram of the central shaft provided by an embodiment of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the compression ring provided by an embodiment of the present invention;

[0028] Figure 6 is Figure 5 a sectional view taken along line A-A in

[0029] Figure 7 It is a schematic structural diagram of the pressing plate provided by an embodiment of the present invention;

[0030] Figure 8 is Figure 7 a sectional view taken along line A-A in. Detailed implementation manners

[0031] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0032] Figure 1 It is a schematic structural diagram of a turning tool for a rocket engine injector ring provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of the base provided by an embodiment of the present invention; Figure 3 is Figure 2 a sectional view taken along line A-A in Figure 4 It is a schematic structural diagram of the central shaft provided by an embodiment of the present invention; Figure 5 It is a schematic structural diagram of the compression ring provided by an embodiment of the present invention; Figure 6 is Figure 5 a sectional view taken along line A-A in Figure 7 It is a schematic structural diagram of the pressing plate provided by an embodiment of the present invention; Figure 8 is Figure 7 a sectional view taken along line A-A in.

[0033] As Figure 1As shown in the figure, the turning tooling for the injector ring of a rocket engine includes: a base 1, a central shaft 2, a pressure ring 3, a pressing plate 4, a first nut 5, a second nut 52, and a bolt 6. One end of the central shaft 2 is connected to the middle of the base 1. One end of the base 1 is connected to the machine tool fixture. The center of the thin-walled plate of the injector ring to be machined passes through the central shaft 2, so that one side plane of the thin-walled plate of the injector ring to be machined fits against the other end of the base 1. The first nut 5 is connected to the other end of the central shaft 2, and the first nut 5 presses against the other side of the thin-walled plate of the injector ring to be machined. The center of the pressure ring 3 is sleeved on the other end of the central shaft 2. The second nut 52 is connected to the other end of the central shaft 2, the second nut 52 presses against the pressure ring 3, and the pressure ring 3 presses against the inner side of the thin-walled plate of the injector ring to be machined. Among them, the pressure ring 3 is located between the first nut 5 and the second nut 52. The pressing plate 4 is connected to the base 1 through the bolt 6, and the pressing plate 4 presses against the outer side of the thin-walled plate of the injector ring to be machined.

[0034] The base 1 is of a disc structure. One side of the disc is connected to the machine tool fixture, and the other side is used to support and position the workpiece. Several circles of annular grooves are distributed on the disc surface to avoid the turning tool when the product is turned into a ring. The central shaft 2 is connected to the base 1 through a threaded hole, which is used to determine the center position of the workpiece, so that the center of the product is at the center of the machine tool and the tooling, and cooperates with the nut to limit and press the product. The pressure ring 3 is used to press the workpiece to ensure that the central area part of the workpiece fits against the base 1. The pressing plate 4 fixes the workpiece on the base 1 through the bolt 6 and is used to limit and press the workpiece. The usage method of the turning tooling for the injector ring is to fix the tooling on the machine tool, pass the injector ring blank through the central shaft, and press it tightly on the base of the tooling with the nut. The pressure ring assists in pressing. By using the method of pressing with the central shaft and cutting the outer diameter of the ring, pressing the outer diameter with the pressing plate, and then cutting the inner diameter of the ring, the workpiece is successively cut from the blank into injector rings of different diameters. The superiority of the present invention lies in: realizing the axial turning of the thin-walled injector ring by using the above clamping tooling and usage method, being able to control the deformation amount of the injector ring during the machining process, ensuring the tolerance requirements such as diameter size and roundness, meeting the subsequent assembly and brazing requirements of the product. The tooling structure is simple and practical, ensuring the batch quality of the product.

[0035] As Figure 2 and Figure 3 shown, the base 1 is a disc, and multiple circles of annular grooves are provided on the disc surface to avoid the turning tool when the product is turned into a ring. There are 8 circles of annular grooves on one side plane of the base to prevent the turning tool from damaging the surface of the tooling during turning. The center of the base consists of an internal threaded hole and a tapered through hole, which is used to fix the central shaft. And eight bolt holes are evenly distributed on the different outer diameters of the plane of the annular groove for installing the pressing plate.

[0036] As Figure 4 shown, the central shaft 2 is connected to the base 1 through a threaded connection. The central shaft has three external threads, and the base, the pressure ring, and the injector ring are fixed together through the threaded connection.

[0037] As Figure 7 and Figure 8 shown, the number of pressing plates 4 is multiple, and the multiple pressing plates 4 are evenly distributed along the circumferential direction of the base 1. The pressing plate 4 is a rectangular plate, and an opening groove is provided at the center of the plate body of the pressing plate 4 for installing the bolt 6. One side of the pressing plate 4 where the opening groove is provided is arc-shaped, and the arc diameter is larger than the maximum outer diameter of the injector ring obtained by processing the thin-walled plate of the injector ring to be processed. A convex platform is provided at the bottom of the other side of the pressing plate 4, and the convex platform is in contact with the thin-walled plate of the injector ring to be processed, and the thickness of the convex platform is the same as the thickness of the thin-walled plate of the injector ring to be processed. The pressing plate structure is a rectangular plate, with an opening groove of φ10 at the center of the plate body for installing bolts. One side of the opening groove is arc-shaped, and the arc diameter should be larger than the maximum outer diameter of the injector ring to prevent interference with the tool during the processing. There is a 3.5mm convex platform at the bottom of the other side of the pressing plate, and the thickness of the convex platform is the same as that of the injector ring. The function of the convex platform is to make the injector ring contact the pressing plate surface.

[0038] A through hole is provided at the center of the base 1, and the through hole is an internal threaded hole with a taper. One end of the central shaft 2 is threadedly connected to the through hole.

[0039] As Figure 5 and Figure 6 shown, the pressing ring is in the shape of a hub, with a platform on the outermost side, a through hole at the center, and a fan-shaped hollow area on the circumferential side to reduce weight. A total of four different specifications and sizes of pressing rings are configured, and they are selected according to the diameter size of the injector ring to be processed to ensure that the injector ring is compacted on the base plane during turning.

[0040] The base 1 is a disc with a diameter of 400, and the thickness of the base is 55 mm. The center of the disc has an internal thread hole of M40×1.5 and a through hole with a certain taper. There are 8 rings of grooves on one plane of the base. The position of the ring grooves is consistent with the cutting position of the injector ring to be processed. The depth of the ring grooves is 0.5 mm. The size of the ring grooves ensures that the turning tool can cut into the ring grooves when turning axially and can avoid the base plane. The flatness accuracy grade of the plane of the base with the ring grooves is "2" level, which serves as the contact and support plane for the lathe clamping and the injector ring; the central shaft 2 is a stepped shaft, and there are three external threads of M40×1.5, M36×1.5, and M30×1.5 distributed on the shaft for connecting and fixing the base, the injector ring, and the pressure ring. There is a tapered plane near the M40×1.5 external thread. The main function of the tapered plane is to prevent the base from moving. The central shaft is made of CrMn material and undergoes a heat treatment process to ensure its wear resistance and non-deformation during use; the pressure ring 3 is in the shape of a hub, and the center of the pressure ring is a through hole. According to the outer diameter size of the injector ring to be processed, a total of four pressure rings with different outer diameters are equipped; the pressing plate 4 is made of 45 steel, and its structure is a rectangular plate. There is an opening groove of φ10 at the center of the plate body for installing bolts. One side of the opening groove is arc-shaped to prevent interference with the tool during processing. There is a 3.5 mm boss at the bottom of the other side of the plate. The thickness of the boss is the same as that of the injector ring, so that the pressing plate can contact the injector ring surface when pressed; the nut 5 is made of 45 steel. According to the matching requirements of the two external threads of the central shaft 2, the thread sizes of two specifications of M36×1.5 and M30×1.5 are used to fix the injector ring and the pressure ring for the subsequent turning work preparation; the bolt 6 is made of 45 steel. The bolt 6 passes through the pressing plate 4 and is matched with the internal thread in the base 1 to fix the outside of the injector ring with the pressing plate 4 for the subsequent turning work preparation.

[0041] This embodiment also provides a method for processing an injector ring using a turning tool for a rocket engine injector ring. The method includes:

[0042] Install the central shaft 2 on the base 1, pass the center of the thin-walled plate of the injector ring to be processed through the central shaft 2 so that one plane of the thin-walled plate of the injector ring to be processed is attached to one side of the base 1, and fix the thin-walled plate of the injector ring to be processed through the first nut 5 installed on the central shaft 2;

[0043] Install the pressure ring 3 on the central shaft 2 through the second nut 52 so that the pressure ring 3 presses against the inner side of the thin-walled plate of the injector ring to be processed;

[0044] Install the pressing plate 4 at the position of the bolt hole reserved on the base 1 through the bolt 6. By tightening the bolt 6, make the pressing plate 4 press against the outside of the cutting part of the thin-walled plate of the injector ring to be processed;

[0045] The injector rings are successively turned from the largest to the smallest according to their sizes. When turning, first cut off the outer diameter of the largest injector ring along the axial direction and machine the outer diameter dimension in place. Then, use the pressing plate 4 to press the outer side of the largest injector ring surface against the outer circle. Finally, cut off the inner diameter of the largest injector ring and machine the inner diameter dimension in place. After removing the largest injector ring, use the pressing ring 3 to press the next injector ring, repeat the above operations, cut off the outer diameter and inner diameter of the next injector ring until all the injector rings are cut off. The pressing ring can be replaced with different specifications according to the diameter size of the cut ring to ensure that the ring surface is firmly pressed on the tooling during turning.

[0046] Specifically, the steps are as follows:

[0047] 1. Clamp the outer circle of the base 1 of the lathe with four jaws, connect and fix the central shaft 2 to the base 1 through threads, pass the injector ring plate through the central shaft 2, and cooperate with the central shaft through the nut 5 so that one side of the injector ring is closely attached to and fixed with the side with the ring groove of the base 1. Select a pressing ring 3 with a suitable outer diameter size, pass the central through-hole of the pressing ring through the central shaft 2, and threadedly cooperate with the central shaft 2 through the second nut 52 to press it on the surface of the injector ring plate. Use eight pressing plates 4 to press the outermost side of the injector ring plate. Specifically, clamp the outer circle of the base 1 of the lathe, connect and fix the central shaft 2 to the base 1 by relying on the threaded connection of the tapered side of the M40×1.5 external thread of the central shaft 2. Pass the circular thin-wall injector ring plate to be cut through the central shaft 2, and cooperate with the central shaft through the M36×1.5 nut 5 so that one side of the injector ring is closely attached to and fixed with the side with the ring groove of the base 1. Select a pressing ring 3 with a suitable outer diameter size, pass the central through-hole of the pressing ring through the central shaft 2, and threadedly cooperate with the central shaft through the M30×1.5 second nut 52 to press the pressing ring 3 on the injector ring. Then, pass eight bolts 6 through the pressing plates 4 and install them in the threaded holes reserved on the base 1, adjust the positions of the eight pressing plates 4 and tighten the bolts to press the outermost side of the injector ring.

[0048] 2. Clamp the lathe with four jaws, align the outer circle and end face of the base within 0.05 mm, measure the actual value of the ring groove of the injector disc, and determine the processing dimensions of the inner and outer diameters of the injector ring according to the fitting clearance requirements.

[0049] 3. First, cut off the outer diameter of the injector ring with the largest diameter along the axial direction and machine the outer diameter dimension in place. Then, use the pressing plate to press the outer side of the injector ring surface, cut off the inner diameter of the largest ring and machine the inner diameter dimension in place. Finally, remove the cut-off injector ring.

[0050] 4. Use the pressing ring to press the surface of the next ring to be processed, repeat the content of step 3 to cut off the ring. Cut the complete set successively from the largest to the smallest according to the sizes of the injector rings. Select pressing rings of different specifications according to the diameter size of the injector ring during the turning process to ensure that the injector ring fits tightly with the tooling.

[0051] The turning tooling for the injector disk ring of the rocket engine in this embodiment can realize the clamping and turning of the thin-walled parts of the injector ring; the turning tooling has a simple and durable structure, is convenient for clamping, solves the problem of cutting deformation of the large-diameter thin-walled ring, and ensures the product quality; this embodiment adopts the processing method of turning the injector ring with a matching turning tooling, avoiding the problem of out-of-tolerance machining of diameter and cylindricity caused by the deformation of the whole injector ring; it solves the problem of turning the injector disk and the injector ring with matching, and the tooling clamping and alignment method is simple and convenient, and can accurately and efficiently complete the turning of the injector ring with matching.

[0052] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and decorations made to the above embodiments according to the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A turning tooling for the injector ring of a rocket engine, characterized in that Comprising: A base (1), a central shaft (2), a pressure ring (3), a pressing plate (4), a first nut (5), a second nut (52) and a bolt (6); wherein, One end of the central shaft (2) is connected to the middle of the base (1); One end of the base (1) is connected to a machine tool fixture; The center of the injector ring thin-walled plate to be machined passes through the central shaft (2) so that one side plane of the injector ring thin-walled plate to be machined fits against the other end of the base (1); The first nut (5) is connected to the other end of the central shaft (2), and the first nut (5) presses against the other side of the injector ring thin-walled plate to be machined; The center of the pressure ring (3) is sleeved on the other end of the central shaft (2); The second nut (52) is connected to the other end of the central shaft (2), the second nut (52) presses against the pressure ring (3), and the pressure ring (3) presses against the inner side of the injector ring thin-walled plate to be machined; wherein, the pressure ring (3) is located between the first nut (5) and the second nut (52); The pressing plate (4) is connected to the base (1) through the bolt (6), and the pressing plate (4) presses against the outer side of the injector ring thin-walled plate to be machined.

2. The turning tooling for the rocket engine injector ring according to claim 1, characterized in that: The number of the pressing plates (4) is multiple, and the multiple pressing plates (4) are evenly distributed along the circumferential direction of the base (1).

3. The turning tool for the rocket engine injector ring according to claim 1, characterized in that: The base (1) is a disc, and multiple rings of annular grooves are formed on the disc surface for avoiding the turning tool when the product is turned into a ring.

4. The turning tooling for the rocket engine injector ring according to claim 1, characterized in that: The central shaft (2) is threadedly connected to the base (1).

5. The turning tool for the rocket engine injector ring according to claim 1, characterized in that: The pressing plate (4) is a rectangular plate, and an opening groove is formed at the center of the plate body of the pressing plate (4) for installing the bolt (6).

6. The turning tool for the rocket engine injector ring according to claim 5, characterized in that: One side of the pressing plate (4) where the opening groove is formed is arc-shaped, and the arc diameter is larger than the maximum outer diameter of the injector ring obtained by machining the injector ring thin-walled plate to be machined.

7. The turning tooling for the rocket engine injector ring according to claim 5, characterized in that: A boss is arranged at the bottom of the other side of the pressing plate (4), and the boss contacts with the injector ring thin-walled plate to be machined.

8. The turning tool for the rocket engine injector ring according to claim 7, characterized in that: The thickness of the boss is the same as the thickness of the injector ring thin-walled plate to be machined.

9. The turning tool for the rocket engine injector ring according to claim 1 or 3, characterized in that: A through hole is formed at the center of the base (1), and the through hole is an internally threaded hole with a taper. One end of the central shaft (2) is threadedly connected to the through hole.

10. A processing method for a injector ring using the turning tool for the injector ring of any one of claims 1-9, characterized in that Comprising: Install the central shaft (2) on the base (1), pass the center of the injector ring thin-walled plate to be machined through the central shaft (2) so that one side plane of the injector ring thin-walled plate to be machined fits against one side of the base (1), and fix the injector ring thin-walled plate to be machined through the first nut (5) installed on the central shaft (2); Install the pressure ring (3) on the central shaft (2) through the second nut (52) so that the pressure ring (3) presses against the inner side of the injector ring thin-walled plate to be machined; Install the pressing plate (4) at the position of the bolt hole reserved on the base (1) through the bolt (6), and by tightening the bolt (6), make the pressing plate (4) press against the outer side of the part to be cut of the injector ring thin-walled plate to be machined; The injector rings are successively turned from the largest to the smallest according to the size of each injector ring. Among them, when turning, first cut off the outer diameter of the largest injector ring along the axial direction and machine the outer diameter dimension in place. Then, use a pressing plate (4) to press the outer side of the largest injector ring surface against the outer circle. Finally, cut off the inner diameter of the largest injector ring and machine the inner diameter dimension in place. After removing the largest injector ring, use a pressing ring (3) to press the next injector ring, repeat the above operations, cut off the outer diameter and inner diameter of the next injector ring until all the injector rings are cut off.

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