A casing inner sleeve assembly clamp tool and casing inner sleeve guide ring removal method

Abstract

The application discloses a machine case inner sleeve assembly clamp tool and a machine case inner sleeve flow guide ring removal method. The tool comprises a fixing disc, a connecting structure on the fixing disc is connected with a machining equipment workbench, a positioning piece is arranged in a hole on the lower end surface of the machine case inner sleeve to be machined, a pressing assembly comprises a support rod fixed at one end of the fixing disc and a pressing part detachably connected to the other end of the support rod, the pressing part comprises a connecting piece provided with a mounting hole and at least two pressing rods uniformly arranged around the mounting hole and connected to the connecting piece, the circumcenter of the circumference is arranged on the axis of the mounting hole, and one end of the pressing rod is provided with a step structure for pressing the upper end surface of the machine case inner sleeve to be machined and simultaneously abutting against the inner diameter of the upper end surface of the machine case inner sleeve to be machined. At least two shape adjusting assemblies are arranged on the fixing disc and used for applying an outward force to the inner diameter surface of the machining area of the machine case inner sleeve. The tool is easy to align the machine case inner sleeve and convenient for machining the flow guide ring.

Description

Technical Field

[0001] This invention belongs to the technical field of casing inner sleeve guide ring replacement, specifically relating to a casing inner sleeve clamping fixture and a method for removing the casing inner sleeve guide ring. Background Technology

[0002] After aero-engine casing inner sleeves enter service, cracks may develop in the guide rings, affecting engine performance. The guide rings need to be replaced to meet performance requirements. Currently, the process involves first mounting the casing inner sleeve on the machining equipment's worktable, followed by tool setting and machining.

[0003] The following prominent problems exist when machining the inner sleeve guide ring of the casing after service using existing methods:

[0004] (1) When the inner sleeve of the casing is placed on the processing equipment for processing, it is necessary to clamp and align the inner sleeve of the casing. This process is cumbersome, inefficient and requires a lot of labor for the operator.

[0005] (2) During the use of the inner sleeve of the casing, it is affected by high temperature and high pressure, which will cause irregular deformation of the parts themselves. It is impossible to process the guide ring according to the standard size during processing, and the processing difficulty is relatively large. Summary of the Invention

[0006] To address the problems of cumbersome alignment of the casing inner sleeve and inconvenience in machining the guide ring in existing methods, this invention provides a casing inner sleeve clamping fixture and a method for removing the guide ring from the casing inner sleeve, which facilitates casing inner sleeve alignment and machining of the guide ring.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] The first aspect of the present invention provides a housing-mounted clamping fixture, comprising:

[0009] A fixed plate, wherein the fixed plate is provided with a connection structure for connecting to the worktable of the processing equipment;

[0010] At least two positioning elements are provided, which are detachably connected to the holes in the lower end face of the inner sleeve of the casing to be processed, and all positioning elements are arranged on a circumference.

[0011] A crimping assembly includes a support rod fixed at one end to a fixed plate and a crimping part detachably connected to the other end of the support rod. The crimping part includes a connector with a mounting hole and at least two pressure rods evenly arranged around the mounting hole and connected to the connector. The center of the circumference is located on the axis of the mounting hole. One end of the pressure rod is provided with a stepped structure that crimps against the upper end face of the inner sleeve of the housing to be processed and simultaneously abuts against the inner diameter of the upper end face of the inner sleeve of the housing to be processed.

[0012] At least two shaping components are provided on the fixed plate to apply an outward force to the diameter surface within the machining area of ​​the inner sleeve of the housing to be machined.

[0013] A second aspect of the present invention provides a method for removing a guide ring from the inner sleeve of a casing, comprising the following steps:

[0014] The casing-in-clamping tool described in the first aspect is placed at the center of the worktable of the processing equipment;

[0015] The inner sleeve of the casing to be processed is placed on the clamping fixture of the inner sleeve of the casing to achieve positioning, alignment and shape correction;

[0016] Determine the maximum outer diameter of the inner sleeve of the casing to be processed and take the maximum outer diameter as the test starting point. While controlling the rotation of the fixed plate, measure the outer diameter data of the entire circumference of the inner sleeve of the casing to be processed.

[0017] Set a coordinate system for the inner sleeve of the casing to be processed, wherein the zero point in the X and Y directions of the coordinate system is the center of the mounting hole, and the zero point in the Z direction is the upper end face of the inner sleeve of the casing to be processed.

[0018] The outer diameter data of the entire circumference of the inner sleeve of the machine casing to be processed is segmented, the change in outer diameter of each segment is calculated, and the angle value of the tool is set according to the change in outer diameter.

[0019] After tool setting, the inner sleeve guide ring of the casing is machined until the machining is completed.

[0020] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0021] 1. The clamping fixture of the present invention achieves fast alignment of the inner casing by setting multiple positioning parts on the same circumference on the fixed plate and fixing them to the lower end hole of the inner casing to be processed.

[0022] 2. The present invention provides a shaping component on a fixed plate to apply an outward force to the inner diameter surface of the machine casing to be processed, thereby achieving straightening, reducing deformation, and facilitating the processing of the guide ring.

[0023] 3. This solution uses a segmented setting of tool angle values ​​to make the machining path conform to the actual changes of the guide ring inside the casing, thereby achieving precise machining of the guide ring. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the internal mounting fixture of the present invention.

[0026] Figure 2 Assembly drawing of the clamping fixture and the inner sleeve of the casing;

[0027] Figure 3 This is a structural schematic diagram of a compression member. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] This invention discloses a clamping fixture for an internal casing, which assists in the replacement of the guide ring. Specifically, as shown... Figure 1 As shown, the internal clamping fixture of the housing includes a fixed plate, at least two positioning elements, a crimping assembly, and at least two shaping assemblies.

[0035] The fixing plate is used to fix and support the positioning components, pressing components, and shaping components. The fixing plate is equipped with a connection structure for connecting to the worktable of the processing equipment. The positioning components are detachably connected to the holes in the lower end face of the inner sleeve 4 of the housing to be processed. All positioning components are arranged on a circumference and correspond to the positions of the holes in the lower end face of the inner sleeve 4 of the housing to be processed, so as to achieve accurate positioning of the inner sleeve of the housing.

[0036] The crimping assembly includes a support rod 31 and a crimping part 32. One end of the support rod 31 is fixed to the fixing plate 1, and the other end is detachably connected to the crimping part 32. The crimping part 32 includes a connector 321 with a mounting hole 324 and at least two pressure rods 322 evenly distributed around the mounting hole and connected to the connector 321. The connector 321 is detachably connected to the end of the support rod 31 through the mounting hole and bolts. To ensure structural stability, the connector 321 and the pressure rods 322 are preferably an integral structure. One end of the pressure rod 322 is provided with a stepped structure 323 that crimps against the upper end face of the inner sleeve of the housing to be processed and simultaneously abuts against the inner diameter of the upper end face of the inner sleeve of the housing to be processed. The center of the circumference of the positioning member is located on the axis of the mounting hole. The crimping assembly achieves crimping from the upper end face of the inner sleeve of the housing to be processed, applying a downward clamping force to the inner sleeve of the housing to be processed, so that the inner sleeve of the housing to be processed does not loosen during processing, thereby improving the processing quality.

[0037] The shaping component is mounted on the fixed plate 1 to apply an outward force to the radial surface of the inner sleeve of the machine casing to be processed, so as to shape the deformed area to reduce the deformation during processing, facilitate the processing of the guide ring in the processing area, and improve the processing quality.

[0038] Using the above-mentioned clamping fixture, the positioning component enables rapid positioning and alignment of the inner sleeve of the casing to be processed, the pressing component enables pressing of the inner sleeve of the casing to be processed, and the shaping component corrects the shape of the inner sleeve of the casing to be processed, thereby improving the processing quality of replacing the guide ring of the inner sleeve of the casing to be processed.

[0039] Based on the above principle, the pressure bar 322 can be 2, 3, 4, or even more. To improve the stability of the crimping of the inner sleeve of the casing to be processed, such as... Figure 3 As shown, there are four pressure bars 322, each placed on one of two perpendicular straight lines.

[0040] There are several ways to implement a positioning component, such as using two positioning rods of different diameters, with the upper rod having a smaller diameter than the lower rod. The upper positioning rod is placed inside the hole on the lower end face of the inner sleeve 4 of the housing to be processed. However, with this structure, the hole needs to be aligned with the upper positioning rod during installation, which is inconvenient. Therefore, a preferred positioning component includes a support column 21 and a bolt 22 for placement inside the hole and connection to the support column.

[0041] There are various ways to implement the structure of a fixed plate, such as using a circular structure. However, since the fixed plate is made of metal, it is relatively heavy. To reduce the weight of the fixed plate, facilitate operation, and reduce manufacturing costs, the fixed plate includes a fixed ring 11 and a connecting strip 12 connected to the fixed ring 11. The connecting structure is a connecting hole 13, which is provided on the connecting strip 12.

[0042] In order to improve the alignment of the axis of the inner sleeve of the machine casing to be processed with the center of the machine table after the fixed plate is installed on the worktable of the processing equipment, there are 4 connecting strips 12. The 4 connecting strips 12 are respectively placed on two straight lines, and the intersection of the two straight lines is on the same straight line as the axis of the mounting hole 324.

[0043] To facilitate fixing the fixed plate to the worktable of the processing equipment, the connecting hole 13 is a slotted hole.

[0044] To further reduce the weight of the fixed plate, the fixing ring 11 is provided with weight reduction holes 14. The number and location of the weight reduction holes 14 are determined to ensure the structural stability of the fixed plate.

[0045] The adjusting assembly includes a support 51 fixed on the fixed plate, an adjusting cylinder 52 fixed on the support 51, a slider 53 partially placed inside the adjusting cylinder 52, an adjusting screw threadedly connected to the slider 53 inside the adjusting cylinder, and an operating part 54 fixedly connected to the adjusting screw at one end of the adjusting cylinder 52.

[0046] The adjusting screw is threadedly connected to the slider. Under the limiting action of the adjusting cylinder, rotating the operating part drives the adjusting screw to rotate, thereby driving the slider to retract or extend relative to the adjusting cylinder, thus controlling the contact between the slider 53 and the inner diameter surface of the machine casing to be processed.

[0047] By adopting the above-mentioned adjustment component structure, the distance between the slider and the support can be adjusted by rotating the operating part, thereby adjusting the magnitude of the force applied to the radial surface of the inner sleeve of the machine casing to be processed. The structure is simple, easy to operate, and easy to adjust.

[0048] Furthermore, in order to improve the fit with the inner diameter surface of the machined casing, the angle between the end face of the slider 53 outside the adjusting cylinder 52 and the surface of the fixed disk is 56°.

[0049] The method for removing the inner casing guide ring based on the above-mentioned clamping fixture includes steps S01 to S06.

[0050] Step S01: Place the housing clamping fixture of any of the above structures at the center of the worktable of the processing equipment.

[0051] For example, first, such as Figure 1 The housing clamping fixture shown is placed on the worktable of the machining equipment. It can be fixed to the worktable of the machining equipment by bolts through the waist-shaped holes on the four connecting strips 12, so that the center of the worktable of the machining equipment is aligned with the center of the housing clamping fixture.

[0052] Step S02: Place the inner sleeve of the casing to be processed on the clamping fixture of the inner sleeve of the casing to achieve positioning, alignment and shape correction.

[0053] The operation process is as follows: First, place the inner sleeve of the casing to be processed on the clamping fixture, and use bolts to fix the hole on the lower end face of the inner sleeve 4 to the positioning component, thereby achieving accurate positioning of the inner sleeve. Then, place the pressing assembly on the upper end face of the inner sleeve, pressing the stepped structure 323 of each pressing rod 322 against the upper end face of the inner sleeve, as shown in the image. Figure 2 As shown. Next, the shaping component is adjusted to apply a force from the inside to the outside of the machining area of ​​the inner sleeve of the housing to be machined, so as to reduce the deformation of the machining area.

[0054] Step S03: Determine the maximum outer diameter of the inner sleeve of the casing to be processed and take the maximum outer diameter as the test starting point. While controlling the rotation of the fixed plate, measure the outer diameter data of the entire circumference of the inner sleeve of the casing to be processed.

[0055] In this step, a dial indicator can be used to find the maximum outer diameter of the inner casing profile.

[0056] When measuring the outer diameter, the outer diameter data of the entire circumference 360° is measured starting from the point of maximum outer diameter.

[0057] Step S04: Set the coordinate system of the inner sleeve of the machine casing to be processed. The zero point of the coordinate system in the X and Y directions is the center of the mounting hole 324, and the zero point in the Z direction is the upper end face of the inner sleeve of the machine casing to be processed.

[0058] The origin of the coordinate system is set at the center of the plane containing the upper end face of the inner sleeve of the machine casing to be processed.

[0059] Step S05: Divide the outer diameter data of the entire circumference of the inner sleeve of the machine casing to be processed into segments, calculate the outer diameter change of each segment, and set the angle value of the tool according to the outer diameter change.

[0060] This step uses a segmented setting of tool angle values ​​to ensure that the machining path conforms to the actual changes in the guide ring inside the casing, thereby achieving precise machining of the guide ring.

[0061] Step S06: After tool setting, machine the inner sleeve guide ring of the casing until the machining is completed.

[0062] In this step, existing ball end mills can be used for machining. However, since the guide ring material is a high-temperature alloy with high strength and good toughness, it is a difficult-to-machine material. Using existing ball end mills for machining removal presents some problems, such as easy wear, poor machining quality, and low efficiency. Therefore, this step can use coated carbide ball inserts, with the coating being TiAlN.

[0063] Thanks to the use of coated carbide ball inserts, the surface roughness of the machined casing inner sleeve is improved, the machining quality is enhanced, the tool change frequency is reduced, and the machining efficiency is increased.

[0064] The method described in this solution removes the inner sleeve guide ring of the casing. It obtains effective processing data based on the actual deformation of the part and fits the deformation of the part through a processing program to achieve a complete match between the processing path and the area to be processed, thus achieving precise processing of the deformed part.

[0065] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of removing an inner casing flow sleeve, comprising: The method comprises the following steps: A machine case inner sleeve clamping tool is placed in the center of a machining equipment workbench, the machine case inner sleeve clamping tool comprises: a fixed disc provided with a connecting structure connected with the machining equipment workbench; at least two positioning members for detachable connection in the holes in the lower end surface of a machine case inner sleeve (4) to be machined, all the positioning members are arranged on a circumference; a pressing assembly comprising a support rod (31) fixed at one end of the fixed disc (1) and a pressing part (32) detachably connected at the other end of the support rod (31), the pressing part (32) comprises a connecting member (321) provided with a mounting hole (324) and at least two pressing rods (322) uniformly arranged around the mounting hole and connected to the connecting member (321), the center of the circumference is located on the axis of the mounting hole, and one end of the pressing rod (322) is provided with a stepped structure (323) for pressing the upper end surface of the machine case inner sleeve to be machined and simultaneously abutting against the inner diameter of the upper end surface of the machine case inner sleeve to be machined; at least two shape adjusting assemblies arranged on the fixed disc (1) for applying an outward force to the inner diameter surface of the machining area of the machine case inner sleeve to be machined; The machine case inner sleeve to be machined is placed on the machine case inner sleeve clamping tool to realize positioning, alignment and shape correction; The maximum outer diameter of the machine case inner sleeve to be machined is determined, and the maximum outer diameter is taken as a test starting point, the outer diameter data of the entire circumference of the machine case inner sleeve to be machined is measured while the rotation of the fixed disc is controlled; A coordinate system of the machine case inner sleeve to be machined is set, the zero points of the X and Y directions of the coordinate system are the center of the mounting hole (324), and the zero point of the Z direction is the upper end surface of the machine case inner sleeve to be machined; The outer diameter data of the entire circumference of the machine case inner sleeve to be machined is segmented, the outer diameter change of each segment is calculated, and the angle value of the tool is set according to the outer diameter change. After tool setting, the machine case inner sleeve flow guide ring is machined until the machining is completed.

2. The method of claim 1, wherein: The machining of the machine case inner sleeve flow guide ring after tool setting until the machining is completed comprises: After the tool is installed, tool setting is performed, the tool is a coated hard alloy ball blade, and the coating is TiAlN; the tool is segmented and machined after the angle value of each segment of the tool is adjusted.

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