A method and device for processing a high-pressure compressor support casing

Abstract

The present invention discloses a method and device for processing a high-pressure compressor support casing. The processing method includes sequentially performing a combination of precision drilling, inserting locating pins, drilling rivet holes, removing burrs, applying sealant, assembling, and riveting. The design of the precision holes ensures that the concentricity of subsequent riveting positions remains consistent. During the riveting process, a device with an expanded and contracted outer diameter is used as a riveting aid. A cold punching method using a sample punch combined with hammering is adopted to avoid interference and obstruction during the riveting of the high-pressure compressor support casing while providing support for the sample punch cold punching. The present invention solves the sealing problem during the riveting of the high-pressure compressor support casing, the sealing bushing, and the honeycomb bushing. It has high efficiency and good sealing performance, and opens up a new processing method for the combined riveting of multiple parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine manufacturing, and in particular relates to a processing method and device for riveting a narrow space of a high-pressure compressor support casing. Background Art

[0002] The high-pressure compressor support casing is a critical load-bearing component of the main module, preventing the high-temperature gases within the high-pressure compressor from entering the splitter casing. The temperature within the high-pressure compressor directly affects engine performance, so the design places strict requirements on the sealing of this component's assembly, requiring no leakage at atmospheric pressure. This component is assembled by riveting three matching parts. To ensure its sealing, it requires the development of appropriate processing techniques, the use of sealants, and effective riveting methods.

[0003] To ensure the sealing of parts, it is necessary to ensure that the rivet holes on the three parts are completely aligned. If they are not aligned, the rivets will be subjected to uneven radial extrusion force during the riveting process, which may easily cause leakage between the rivets and the rivet holes (such as Figure 2 As shown), the sealing of the rivet is difficult to ensure.

[0004] Due to the compact spatial structure of the parts, there are many obstructions when using a rivet gun, so conventional riveting methods cannot be used, and new riveting methods need to be explored. Summary of the Invention

[0005] The present invention aims to design a method and device for processing a high-pressure compressor support casing, so as to solve the problem of riveting interference during the manufacturing process and the processing problem of reduced sealing due to riveting interference.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for machining a high-pressure compressor support casing, comprising:

[0008] S1, combined precision drilling: coaxially assemble and clamp the high-pressure compressor support casing, sealing bushing and honeycomb bushing, and then drill multiple precision holes located on the same circumference in the riveted area on the assembly contact surface;

[0009] S2, inserting locating pins: select locating pins with an outer diameter smaller than the inner diameter of the precision hole in S1 and insert them into the precision hole. The insertion method is to insert one locating pin for each precision hole processed.

[0010] S3, drilling: After completing the insertion operation of the positioning pin in S2, drilling the rivet holes, wherein the rivet holes and the plurality of precision holes are distributed on the same circumference;

[0011] S4, deburring: Remove the locating pins, first disassemble the assembled high-pressure compressor support casing, sealing bushing and honeycomb bushing, and then deburr the precision holes machined in S1 and the rivet holes drilled in S3;

[0012] S5, applying sealant: applying sealant on the assembly contact surfaces between the high-pressure compressor support casing and the sealing bushing, and between the sealing bushing and the honeycomb bushing;

[0013] S6, assembly: re-coaxially assemble the high-pressure compressor support casing, sealing bushing, and honeycomb bushing to which the sealant coating has been completed in S5, and then reinsert the locating pins into the precision holes to restore the high-pressure compressor support casing, sealing bushing, and honeycomb bushing to the assembly position relationship of S2;

[0014] S7, riveting: After completing S6, place the flat-head hollow rivet into the rivet hole, set a support at one end of the flat-head hollow rivet, and use a hammer to hit the sample punch at the other end to complete the first step of riveting between the high-pressure compressor support casing, sealing bushing and honeycomb bushing. Then remove the locating pin from the precision hole, and then place the flat-head hollow rivet into the precision hole, and use a hammer to hit the sample punch to complete the second step of riveting between the high-pressure compressor support casing, sealing bushing and honeycomb bushing.

[0015] As a solution, in S1, when the high-pressure compressor support casing, sealing bushing and honeycomb bushing are coaxially assembled, a positioning surface is selected on the non-assembly contact surface of the high-pressure compressor support casing, sealing bushing and honeycomb bushing respectively, and the three positioning surfaces are parallel to the assembly axis of the high-pressure compressor support casing, sealing bushing and honeycomb bushing.

[0016] As a solution, in S1, the number of precision holes is four, and the angle between the centers of any two adjacent precision holes is 90°.

[0017] As a solution, the S5 includes:

[0018] S51, Surface Cleaning: Use organic solvent to clean the assembly contact surfaces of the high-pressure compressor support casing, sealing bushing and honeycomb bushing;

[0019] S52, primer: Apply primer on the surface cleaned in S51, wherein the primer is a material that increases the adhesion between the sealant and the surfaces of the high-pressure compressor support casing, the sealing liner, and the honeycomb liner;

[0020] S53, sealant preparation and coating: prepare the sealant and apply the prepared sealant to the surface with the primer in S52.

[0021] As a solution, in S52, when applying the primer, multiple coatings are adopted, and a period of time for the primer to be oxidized and air-dried is reserved between two adjacent coatings.

[0022] As a solution, the high-pressure compressor support casing processing method also includes S8: vulcanization treatment, which uses room temperature vulcanization or a combination of room temperature and high temperature vulcanization to vulcanize the sealant between the high-pressure compressor support casing, the sealing sleeve and the honeycomb sleeve riveted in S7.

[0023] As a solution, in S4, before removing the positioning pin, mark the position of the precision hole so that the same precision hole on the high-pressure compressor support casing, the sealing bushing, and the honeycomb bushing corresponds to the same mark;

[0024] In said S6, the high pressure compressor support casing, the sealing bushing and the honeycomb bushing are assembled with the aid of the markings in S4, and then the positioning pins are inserted into the precision holes.

[0025] As a solution, in S7, a device with a variable outer diameter is used to avoid the interference structure and extend into the riveting position area of ​​the high-pressure compressor support casing, the sealing bushing and the honeycomb bushing, thereby forming a support for one end of the flat-head hollow rivet.

[0026] A device for the above-mentioned high-pressure compressor support casing machining method, comprising:

[0027] base;

[0028] A central cylinder, the central cylinder passing through the base, the outer surface of the central cylinder on the side of the upper end surface of the base including a circle of outer cone surface, and the outer surface of the central cylinder on the side of the lower end surface of the base including a section of thread;

[0029] An adjusting nut, said adjusting nut being sleeved on the thread of the central cylinder;

[0030] A fixing sleeve, which is sleeved on the central cylinder and is located between the lower end surface of the base and the adjusting nut;

[0031] Sector-shaped discs, multiple sector-shaped discs with equal radius are slidably connected to the upper end surface of the base, and the sliding paths of the sector-shaped discs are different radial lines of the same circumference. The end of the multiple sector-shaped discs away from the sector-shaped outer arc includes an inner conical surface with the same taper as the outer conical surface on the central cylinder.

[0032] Furthermore, the sector-shaped disc is a 1 / 4 disc, and the inner conical surfaces of the four 1 / 4 discs are pressed tightly against the outer conical surface of the central cylinder by an annular spring. A through hole is opened on the 1 / 4 disc, and a rebound block slidably connected to the base is provided in the through hole. The rebound block includes a part located on one side of the upper end surface of the base, and a rebound block spring connecting rod located on one side of the lower end surface of the base. The rebound block spring connecting rod is connected to the fixed sleeve via a contraction spring.

[0033] Compared with the prior art, the high-pressure compressor support casing processing method and device of the present invention have the following advantages:

[0034] 1) The concept of the present invention can be used to solve the problem of poor riveting and sealing after the assembly and processing of multi-layer parts of different models. With the upgrading of engines, engine parts will become more and more complex, and sealing processes such as riveting and coating sealants will be used more and more. Research on tight riveting methods and the use of sealants is becoming increasingly important and has a very wide range of applications.

[0035] 2) The present invention cleverly utilizes structural design to produce a rivet support device with an expandable outer diameter. The outer diameter can be adjusted by adjusting the nut, providing stable and convenient auxiliary support for parts, greatly improving efficiency. This device solves the problem of special structures (where there is interference with the rivet gun) that cannot be riveted using the traditional riveting process. By combining a cleverly designed support fixture with a sample punch, rivet installation can be completed efficiently.

[0036] 3) The present invention effectively solves the problem of rivet hole non-concentricity by combining drilling and precision hole insertion to insert the positioning pin;

[0037] 4) Through repeated adjustments, the present invention has obtained the optimal method for using the sealant, including the configuration ratio, coating method, operation process, etc. This method and the configuration of the sealant have promotional significance for other parts with similar structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the riveting of the high-pressure compressor support casing, sealing liner and honeycomb liner;

[0039] Figure 2 This is a schematic diagram of rivet hole misalignment failure;

[0040] Figure 3 It is a schematic diagram of riveted obstruction;

[0041] Figure 4 This is a schematic diagram of the assembly and clamping of the high-pressure compressor support casing, sealing liner and honeycomb liner;

[0042] Figure 5 It is a schematic diagram of precision hole distribution;

[0043] Figure 6 It is a schematic diagram of riveting punch;

[0044] Figure 7 It is a schematic diagram of rivet holes and rivets;

[0045] Figure 8 This is a design drawing of a device used for riveting in the machining of a high-pressure compressor support casing;

[0046] Figure 9 yes Figure 8 Corresponding physical picture;

[0047] Figure 10 yes Figure 9 A picture of the object in a closed state;

[0048] Figure 11 yes Figure 9 A photo of the object in its expanded state;

[0049] In the figure; 1-center cylinder, 2-adjusting nut, 3-fixing sleeve, 4-pin, 5-fixing screw, 6-rebound block spring connecting rod, 7-disc base, 8-rebound block and disc fixing screw, 9-1 / 4 disc, 10-rebound block, 11-annular spring, 12-contraction spring, 13-base support rod, 14-adjusting nut rod. DETAILED DESCRIPTION

[0050] The present invention is further described below with reference to the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0051] In response to the processing and riveting problems of the high-pressure compressor support casing, sealing liner, and honeycomb liner, this embodiment provides the following solutions:

[0052] 1) Combined drilling of precision holes:

[0053] The three supporting parts of the high-pressure compressor support casing, sealing bushing and honeycomb bushing are assembled according to the Figure 4 Assemble and clamp in the manner shown, first press Figure 5 As shown, four precision holes are machined. The diameter of the precision hole is the diameter of the positioning pin plus a margin. In this embodiment, the diameter of the positioning pin is Φ10, and the diameter of the precision hole is Φ10+0.03mm. When assembled, it contains three positioning surfaces ( Figure 5 The three inner cylindrical surfaces in the middle are parallel to the assembly axis, and the three locating surfaces are respectively located on the inner walls of the high-pressure compressor support casing, sealing bushing and honeycomb bushing), thereby ensuring the concentricity of the three matching parts.

[0054] 2) Insert the positioning pin:

[0055] After each precision hole is machined, a precision cylindrical locating pin is inserted into the precision hole to ensure that there is no relative displacement between the three matching parts during the machining process.

[0056] 3) Matching diamonds:

[0057] A precision cylindrical pin is inserted into each precision hole to ensure that there is no relative displacement between the three supporting parts during the processing. Then the remaining 28 rivet holes are drilled and processed. The precision holes are essentially rivet holes, but they have a positioning function compared to the other rivet holes.

[0058] 4) Deburring:

[0059] After the matching drilling is completed, the four precision holes are first marked with matching marks. Then, the three parts are disassembled and the burrs of the rivet holes and precision holes are removed to avoid affecting the subsequent application of sealant.

[0060] 5) Apply sealant:

[0061] (1) Surface cleaning: The cleanliness of the part surface directly affects the sealant adhesion, so it is very important to clean the parts before applying the sealant. When cleaning, use a dry, clean cloth or cotton wool dipped in acetone or alcohol to wipe the contact surfaces of the three matching parts. After cleaning, let them sit for 10 to 15 minutes. Wait until the acetone or alcohol has completely evaporated before applying the sealant. Be careful to avoid secondary contamination of the parts during the placement process.

[0062] (2) Primer: The purpose of primer is to increase the adhesion between the sealant and the surface of the part. Select the appropriate primer according to the type of sealant. When primer is applied, use a brush, cotton wool or medical gauze to dip a little primer and evenly apply a thin layer on the clean surface. After leaving it for 30 minutes, apply another thin layer of adhesive primer on the surface using the same method. After coating, ensure 30 minutes of oxidation time and apply the sealant within 4 hours. Otherwise, the primer will not be able to dry completely and will not have the effect of primer. The environment must be kept clean during the placement process.

[0063] (3) Preparation of sealant (i.e. sealant): The sealant needs to be vulcanized. Vulcanization is the process of the sealant reacting with the catalyst, so the sealant needs to be mixed before application. When mixing, take the sealant base paste and add the catalyst in a ratio of 100:1 and stir evenly.

[0064] (4) Application of sealant: Apply a layer of mixed sealant on each contact surface of the matching parts with a scraper within 30 minutes to 4 hours after the primer is applied. Figure 1 There are four surfaces of coating position, namely one surface of high pressure compressor support casing, two surfaces of sealing liner and one surface of honeycomb liner.

[0065] (5) Vulcanization of the sealant: The sealant can be vulcanized at room temperature for 7 to 10 days, or it can be vulcanized at room temperature for 24 hours and then at 70°C for 1 day. For processing efficiency, room temperature vulcanization followed by heating to 70°C is usually adopted. In this embodiment, the sealant is vulcanized at room temperature for 7 days. The room temperature here refers to the ambient temperature, and no additional heating equipment is used to increase the temperature.

[0066] 6) Assembly:

[0067] Since the vulcanization process is the process of sealant solidification, in order to ensure the best adhesion between the sealant and the part surface, the three supporting parts should be assembled immediately after applying the sealant. First, the three supporting parts should be assembled according to the markings when riveting. Secondly, four precision cylindrical locating pins should be inserted into the four precision holes to ensure that the parts are restored to the state when the holes were drilled, and the rivet holes of the three supporting parts are completely aligned.

[0068] 7) Riveting:

[0069] Rivet immediately after assembly. After the parts are clamped, refer to Table 1 and place the sample punch vertically into the hollow pin hole of the rivet. Strike the sample punch with a hammer to complete the riveting. The rivet is squeezed and deformed, filling the rivet hole. The hollow pin hole expands and fits tightly against the part, achieving the desired fixation.

[0070] Table 1 Riveting classification

[0071]

[0072] Riveting can be done by cold punching. The sample punching diagram is as follows: Figure 6 shown.

[0073] When riveting, use Figure 8 and Figure 9 The device shown is used as a riveted support, which mainly consists of a center cylinder 1, an adjusting nut 2, a fixing sleeve 3, a pin 4, a fixing screw 5, a rebound block spring connecting rod 6, a disc base 7, a rebound block screw 8, a 1 / 4 disc 9, a rebound block 10, an annular spring 11, a contraction spring 12, a base support rod 13 and an adjusting nut rod 14. The structure of the riveted support device is similar to that of a soft claw, and the support surface is composed of four 1 / 4 discs 9 that can move radially. By rotating the adjusting nut 2, the center cylinder 1 can move up and down, and the contact portion between the center cylinder 1 and the 1 / 4 disc 9 is a conical surface fit. When the center cylinder 1 moves up and down, the 1 / 4 disc 9 is radially expanded, and the 1 / 4 disc 9 is closed by the contraction spring 12. The outer arc surface of the 1 / 4 disc 9 plays the function of radially tightening the surface of the parts in the riveted area, such as Figure 7The positions indicated by the left and right arrows are the tight positions of the 1 / 4 disc 9 against the sealing bushing and the honeycomb bushing after radial expansion.

[0074] like Figure 8 The disc base 7 serves as the main body and base of the device. A through hole is formed in its center. One end of the fixing sleeve 3 is inserted into the through hole to assemble with the disc base 7. The fixing sleeve 3 has a through hole along its own central axis, and a through groove perpendicular to the through hole is formed on the circumferential surface of the fixing sleeve 3. The central cylinder 1 includes three characteristic structures: an outer cone, a pin hole, and an external thread. After the central cylinder 1 passes through the through hole of the fixing sleeve 3, the aforementioned three characteristic structures are arranged as follows: the outer cone is located at the upper end of the disc base 7, the pin hole and external thread are located at the lower end of the disc base 7, and a pin 4 is inserted into the pin hole. The two ends of the pin 4 are respectively located in the through grooves on the circumferential surface of the fixing sleeve 3. Under the constraints of the pin 4 and the through grooves, the central cylinder 1 cannot rotate relative to the fixing sleeve 3 and can only move up and down. The adjusting nut 2 is connected to the external thread of the central cylinder 1 and is used to drive the central cylinder 1 to move up and down. The disc base 7 has a sliding hole through which the rebound spring connecting rod 6, connected to the lower end of the rebound block 10, passes. Its distal end is connected to the fixed sleeve 3 via a contraction spring 12. The contraction spring 12 provides the tension that drives the rebound block 10 toward the center cylinder 1. The quarter disc 9 has a notch in which the rebound block 10 rests. As the quarter disc 9 expands radially outward, it strikes the rebound block 10, driving it further radially outward, thereby stretching the contraction spring 12 and generating a radial contraction force. Each quarter disc 9 has an inner conical surface on its inner side (i.e., the side that mates with the center cylinder 1) that mates with the outer conical surface of the center cylinder 1. An annular spring 11 binds and presses the four quarter discs 9 against the outer conical surface of the center cylinder 1, ensuring that they tend to move synchronously. An adjusting nut rod 14 is mounted on the adjusting nut 2 to facilitate operator rotation of the adjusting nut 2. The lower end of the disc base 7 is also connected to four base support rods 13. The rebound block 10 consists of two parts: one located within the notch of the quarter disc 9 and the other located outside the notch. The part located outside the notch is wider than the part located inside the notch, forming a structure with a T-shaped cross-section. The two parts are connected together by rebound block screws 8. (Of course, the rebound block 10 can also be directly processed into a T-shaped cross-section. In this embodiment, to save processing costs, a combined splicing method is used.)

[0075] When riveting, on the one hand, first Figure 10 The device shown in the closed state is inserted into the part to be riveted, avoiding Figure 3 The obstruction position shown below the middle riveting position, and then adjust the device to be in the expanded state (such as Figure 11), the outer diameter of the device expands to achieve the supporting effect. This device cleverly solves the rivet support problem, making the riveting method of sample punching (rivet punching) cold punching reasonable and feasible. Figure 8 The end face of the upper end of the central cylinder 1 is the supporting surface. On the other hand, the sample punch (rivet punch) avoids the top of the part. Figure 3 The two obstructions shown above the middle riveting position enter above the flat head hollow rivet.

[0076] During the riveting process, some unsolidified sealant will flow into the riveted hole. At this time, the riveting will have the best sealing effect. The sealing test can only be carried out after the vulcanization time is reached.

[0077] Any matters not described in detail in the present specification are prior art known to those skilled in the art. Although the above description of the present invention is based on illustrative embodiments to facilitate understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the specific embodiments. As long as various modifications are within the spirit and scope of the present invention as defined and determined by the appended claims, such modifications will be obvious to those skilled in the art, and all inventions and creations utilizing the concepts of the present invention are protected.

Claims

1. A method for machining a high-pressure compressor support casing, characterized in that: include: S1, combined precision drilling: coaxially assemble and clamp the high-pressure compressor support casing, sealing bushing and honeycomb bushing, and then drill multiple precision holes located on the same circumference in the riveted area on the assembly contact surface; S2, inserting locating pins: select locating pins with an outer diameter smaller than the inner diameter of the precision hole in S1 and insert them into the precision hole. The insertion method is to insert one locating pin for each precision hole processed. S3, drilling: After completing the insertion operation of the positioning pin in S2, drilling the rivet holes, wherein the rivet holes and the plurality of precision holes are distributed on the same circumference; S4, deburring: Remove the locating pins, first disassemble the assembled high-pressure compressor support casing, sealing bushing and honeycomb bushing, and then deburr the precision holes machined in S1 and the rivet holes drilled in S3; S5, applying sealant: applying sealant on the assembly contact surfaces between the high-pressure compressor support casing and the sealing bushing, and between the sealing bushing and the honeycomb bushing; S6, assembly: re-coaxially assemble the high-pressure compressor support casing, sealing bushing, and honeycomb bushing to which the sealant coating has been completed in S5, and then reinsert the locating pins into the precision holes to restore the high-pressure compressor support casing, sealing bushing, and honeycomb bushing to the assembly position relationship of S2; S7, Riveting: After completing S6, place a flat-head hollow rivet into the rivet hole. Set a support at one end of the flat-head hollow rivet, and hammer the other end with a sample punch to complete the first step of riveting between the high-pressure compressor support casing, the sealing bushing, and the honeycomb bushing. Then remove the locating pin from the precision hole, and then place the flat-head hollow rivet into the precision hole. Hammer the sample punch to complete the second step of riveting between the high-pressure compressor support casing, the sealing bushing, and the honeycomb bushing. In said S4, before removing the positioning pin, mark the position of the precision hole so that the same precision hole on the high-pressure compressor support casing, the sealing bushing and the honeycomb bushing corresponds to the same mark; In said S6, the high pressure compressor support casing, the sealing bushing and the honeycomb bushing are assembled with the aid of the markings in S4, and then the positioning pins are inserted into the precision holes; In the above S7, a device with a variable outer diameter is used to avoid the interference structure and then extend into the riveting position area of ​​the high-pressure compressor support casing, the sealing bushing and the honeycomb bushing, thereby forming a support for one end of the flat head hollow rivet.

2. A method for machining a high-pressure compressor support casing according to claim 1, characterized in that: In said S1, when the high-pressure compressor support casing, the sealing liner and the honeycomb liner are coaxially assembled, a positioning surface is selected on the non-assembly contact surfaces of the high-pressure compressor support casing, the sealing liner and the honeycomb liner respectively, and the three positioning surfaces are parallel to the assembly axis of the high-pressure compressor support casing, the sealing liner and the honeycomb liner.

3. The method for machining a high-pressure compressor support casing according to claim 1, characterized in that: In S1, the number of precision holes is four, and the angle between the centers of any two adjacent precision holes is 90°.

4. The method for machining a high-pressure compressor support casing according to claim 1, wherein: The S5 includes: S51, Surface Cleaning: Use organic solvent to clean the assembly contact surfaces of the high-pressure compressor support casing, sealing bushing and honeycomb bushing; S52, primer: Apply primer on the surface cleaned in S51, wherein the primer is a material that increases the adhesion between the sealant and the surfaces of the high-pressure compressor support casing, the sealing liner, and the honeycomb liner; S53, sealant preparation and coating: prepare the sealant and apply the prepared sealant to the surface with the primer in S52.

5. A method for machining a high-pressure compressor support casing according to claim 4, characterized in that: In the above-mentioned S52, when applying the primer, multiple coatings are adopted, and a period of time for the primer to be oxidized and air-dried is reserved between two adjacent coatings.

6. The method for machining a high-pressure compressor support casing according to claim 1, characterized in that: It also includes S8: vulcanization treatment, which uses room temperature vulcanization or a combination of room temperature and high temperature vulcanization to vulcanize the sealant between the high-pressure compressor support casing, the sealing bushing and the honeycomb bushing riveted in S7.

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