A method and device for detecting the constraint of a non-rigid ring

Abstract

The application discloses a kind of restraint detection method and detection device of non-rigid ring-shaped piece, belong to the field of aero-engine manufacturing.This method uses front inspection ring and rear inspection ring to exert constraint condition to part, can effectively simulate the assembly state of non-rigid ring-shaped piece on engine.Under constraint condition, the detection results of hole position degree, coaxiality, inner profile surface circle runout and rear end face to front end face parallelism can be obtained respectively, and the detection results can intuitively reflect the precision condition of non-rigid ring-shaped piece on engine;This method plays an important role in controlling the processing quality of parts by detecting the coaxiality between the two groups of precision hole pitch circles of front mounting edge and rear mounting edge;Using this method solves the problem that non-rigid ring-shaped piece deforms in free state, shape and position error is too large, exceeds the tolerance of design drawing, and cannot be inspected and accepted according to design drawing;The obtained detection result is stable and reliable, and can guarantee the assembly precision and use requirement of non-rigid ring-shaped piece.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine manufacturing, specifically relating to the field of engine parts inspection, and particularly to a constraint inspection method and device for non-rigid ring parts. Background Technology

[0002] Thrust-to-weight ratio is a crucial performance indicator for aero-engines, and achieving a high thrust-to-weight ratio requires extremely strict weight control. A key measure for weight reduction in aero-engines is ensuring overall engine rigidity through structural design. While the rigidity of individual engine components may be low, when multiple components are assembled together, their mutual constraints and supports ensure that the overall rigidity of the assembled engine meets operational requirements. This structural design approach allows for the extensive use of non-rigid components in aero-engines. However, non-rigid components are prone to deformation during manufacturing, resulting in discrepancies between the finished product and the theoretical shape required by the design drawings, making it impossible to inspect and accept the parts according to the original design specifications. To circumvent the obstacles encountered during the acceptance of non-rigid components, the industry commonly adopts a method of inspecting and recording the final dimensions during the manufacturing process, with final product inspection only checking the process records. The core of this approach is that during the manufacturing process, the parts are positioned and clamped in the fixture, not yet freed from the fixture's constraints, and the machined surfaces have not yet deformed, thus ensuring accurate and stable inspection results. However, this acceptance procedure has several quality loopholes: First, the positioning and clamping methods in the process are not comprehensive, resulting in significant deviations from the constraint methods of the parts on the engine; second, inadequate control of process details (such as exceeding the flatness standard of the fixture reference surface) can lead to potential quality problems; third, stress release during this process and subsequent processes, or other reasons, may compromise the processing results of this process. These quality loopholes can cause parts that are "qualified" in the process to become de facto non-conforming products upon reaching the finished product stage. Without finished product inspection, it is possible for substandard products to be delivered as qualified, a phenomenon that has occurred multiple times in actual work.

[0003] The compressor casing of a certain type of aero-engine has a large diameter and thin wall, making it a non-rigid component. Furthermore, for ease of assembly and maintenance, the casing is designed as two split rings, connected together by locating pins and bolts via mating flanges on both sides of the joint surface. This split casing exhibits greater deformation than a single-ring casing. The main deformation of the split casing is the non-circularity of the cylinder wall. Due to unequal cylinder wall diameters and thicknesses, the shape and roundness errors of the front and rear cylinder walls are inconsistent after deformation. Roundness errors lead to excessive deviations in the circular runout test results between the front and rear reference circles of the casing, and also cause excessive deviations in the positional accuracy test results of the holes on the mounting edge, creating difficulties for the inspection and acceptance of the casing. On the other hand, coaxiality is a crucial control indicator for engine assembly accuracy; exceeding this tolerance can cause increased engine vibration and a series of performance and safety issues. The design drawings control the coaxiality of the front and rear ends of the casing by the circular runout between the front and rear reference circles and the position of the connecting holes on the front and rear mounting edges. However, when the casing is deformed and not round, the circular runout of the reference circle and the position of the connecting holes cannot intuitively reflect the size of the coaxiality. Furthermore, when the test results are out of tolerance, it is even more difficult to assess the impact of the out-of-tolerance amount on the coaxiality, which creates obstacles for the inspection and acceptance of the casing.

[0004] It is evident that the inspection and acceptance of non-rigid ring-shaped components has always been a challenge in the field of engine parts inspection, and research in this area is needed to find reasonable solutions. Summary of the Invention

[0005] To overcome the above-mentioned technical defects, the present invention provides a constraint detection method and detection device for non-rigid ring parts, which can solve the technical problem of accurate evaluation of parts using existing detection methods due to the large difference between the part shape and the theoretical shape of the design drawing when the non-rigid ring parts are deformed in the free state.

[0006] To achieve the above objectives, the present invention employs the following technical content:

[0007] A constraint detection method for a non-rigid ring component includes:

[0008] The positional accuracy of the holes on the front and rear mounting edges of the part is checked, and the hole positional accuracy test results are obtained; the coaxiality between the two sets of precision hole pitch circles on the front and rear mounting edges is checked, and the coaxiality test results are obtained; the circular runout of the inner surface of the part and the parallelism between the rear end face and the front end face are checked in sequence, and the circular runout and parallelism test results are obtained.

[0009] All of the above steps are carried out under the constraints of the pre-inspection loop and the post-inspection loop, and the constraints are obtained based on the assembly state of the parts on the engine.

[0010] Furthermore, the steps for detecting the positional accuracy of the holes on the front mounting edge are as follows:

[0011] First, insert the part with the front mounting edge facing down into the positioning stop of the front inspection ring;

[0012] The second step is to rotate the part to adjust the angular orientation, align all the precision holes on the front mounting edge with the precision holes on the front inspection ring one by one, and use inspection pins to measure the position of the precision holes in sequence to obtain the position measurement results of the holes on the front mounting edge.

[0013] Furthermore, after obtaining the positional accuracy test results of the front mounting edge hole, bolts are used to connect the front inspection ring to the front mounting edge, so that the front end face of the part fits against the front inspection ring.

[0014] Furthermore, the steps for detecting the positional accuracy of the holes on the rear mounting edge are as follows:

[0015] First, insert the rear inspection ring with the locating stop facing down into the reference hole on the rear mounting edge of the part;

[0016] The second step is to rotate the rear inspection ring to adjust its angle, align all the precision holes on the rear inspection ring with the precision holes on the rear mounting edge one by one, and use inspection pins to measure the position of the precision holes in sequence to obtain the position detection results of the holes on the rear mounting edge.

[0017] Furthermore, after obtaining the position accuracy test results of the rear mounting edge hole, bolts are used to connect the rear inspection ring to the rear mounting edge, so that the rear end face of the part fits with the rear inspection ring.

[0018] Furthermore, the specific steps for coaxiality testing are as follows:

[0019] The first step is to hoist the part, along with the front and rear inspection rings, onto the inspection turntable.

[0020] The second step is to align the front inspection ring reference circle so that the front inspection ring is concentric with the inspection turntable and press the front inspection ring firmly onto the inspection turntable.

[0021] The third step is to check the circular runout of the reference circle of the inspection ring and use the corresponding test value as the coaxiality of the center of the precision hole pitch circle on the rear mounting side to the center of the precision hole pitch circle on the front mounting side.

[0022] Furthermore, the steps for detecting the circular runout of the inner surface of the part are as follows:

[0023] Under coaxiality testing conditions, circular runout is detected at the front, middle, and rear sections of the inner surface of the part to obtain the circular runout test results.

[0024] Furthermore, the steps for detecting the parallelism between the back-end face and the front-end face are as follows:

[0025] Under coaxiality testing conditions, the total runout of the rear end face of the test ring is measured after testing to obtain the parallelism test result.

[0026] Furthermore, coaxiality testing, circular runout testing, and parallelism testing are performed on a coordinate measuring machine.

[0027] A constraint detection device for a non-rigid ring component, comprising:

[0028] The first detection module is used to detect the position of the holes on the front and rear mounting edges of the part and obtain the hole position detection results.

[0029] The second detection module is used to detect the coaxiality between the two sets of precision hole pitch circles on the front mounting edge and the rear mounting edge, and obtain the coaxiality detection result.

[0030] The third detection module is used to sequentially detect the circular runout of the inner surface of the part and the parallelism between the rear end face and the front end face, and obtain the detection results of circular runout and parallelism.

[0031] All three inspection processes are carried out under the constraints of the pre-inspection loop and the post-inspection loop, and the constraints are based on the assembly state of the parts on the engine.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] This invention provides a constraint inspection method for non-rigid ring parts. This method applies constraints to the part using front and rear inspection rings, effectively simulating the assembly state of the non-rigid ring part on an engine. Under constraint conditions, the method can obtain inspection results for hole position accuracy, coaxiality, circular runout of the inner surface, and parallelism between the rear end face and the front end face. The inspection results can intuitively reflect the accuracy of the non-rigid ring part on the engine. This method plays a crucial role in controlling the machining quality of the part by detecting the coaxiality between the two sets of precision hole pitch circles on the front and rear mounting edges. This method solves the problem of non-rigid ring parts deforming in a free state, resulting in large shape and position errors exceeding the design drawing tolerances, making inspection and acceptance according to the design drawings impossible. The obtained inspection results are stable and reliable, ensuring the assembly accuracy and usage requirements of the non-rigid ring part.

[0034] Preferably, in this invention, a combination of inspection ring and inspection pin is used to measure the hole position of the front and rear mounting edges, avoiding the three-coordinate measurement error caused by deformation, making the detection method simple and the detection results reliable.

[0035] Preferably, in this invention, the coaxiality between the two sets of precision hole pitch circles on the front and rear mounting edges is detected by using the reference circles of the front and rear inspection rings, which makes the measurement method simple and the measurement accuracy high. Attached Figure Description

[0036] Figure 1This is a schematic diagram of the structure of a split compressor casing of a certain type of aero-engine provided in an embodiment of the present invention;

[0037] Figure 2 The front view of the compressor casing constraint detection method using a non-rigid ring component provided in the embodiment of the present invention;

[0038] Figure 3 for Figure 2 View A in the middle;

[0039] Figure 4 for Figure 2 View B in the middle;

[0040] Figure 5 This is a longitudinal cross-sectional view of the hole position detection process provided in an embodiment of the present invention.

[0041] Figure 6 A longitudinal cross-sectional view of the pre- and post-clamping installation process provided in an embodiment of the present invention;

[0042] Figure 7 This is an assembly diagram of the front inspection ring and the front inspection pin provided in an embodiment of the present invention;

[0043] Figure 8 This is an assembly diagram of the rear inspection ring and rear inspection pin provided in an embodiment of the present invention;

[0044] Figure 9 A flowchart of a constraint detection method for a non-rigid ring component provided in an embodiment of the present invention.

[0045] Figure label:

[0046] Front inspection ring-1; Front inspection pin-2; Compressor casing-3; Rear inspection ring-4; Rear inspection pin-5; Front clamping bolt-6; Front gasket-7; Front clamping nut-8; Rear clamping nut-9; Rear gasket-10; Rear clamping bolt-11; Front mounting edge-12; Rear mounting edge-13; Upper half ring-14; Lower half ring-15; Joint surface-16; Butt flange-17; Inner profile surface-18; Upper and lower split joint surfaces of the casing-19. Detailed Implementation

[0047] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" 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 the invention is in use, they are only for the convenience of describing the present 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 the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the description of the embodiments of the present 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 the present invention according to the specific circumstances.

[0054] The present invention will now be described in further detail with reference to the accompanying drawings:

[0055] Example

[0056] In this embodiment, the non-rigid annular component is a split compressor casing of a certain aero-engine, in conjunction with what is mentioned in the background art, such as Figure 1 As shown, for ease of assembly and maintenance, the casing is designed as two split rings, namely the upper ring 14 and the lower ring 15, connected by a mating flange 17, forming two mounting edges: the front mounting edge 12 and the rear mounting edge 13. The midpoint between the front mounting edge 12 and the rear mounting edge 13 is the mating surface 16. This split casing deforms more than a one-ring casing. The main deformation of the split casing is the non-circularity of the cylinder wall. Due to the unequal diameter and thickness of the cylinder wall, the shape and roundness errors of the front and rear cylinder walls are inconsistent after deformation. The roundness error causes the circular runout detection results between the front and rear reference circles of the casing to exceed the tolerance, and also causes the positional accuracy detection results of the holes on the mounting edges to exceed the tolerance, making it difficult to inspect and accept the casing. On the other hand, coaxiality is an important control indicator for engine assembly accuracy. Once it exceeds the tolerance, it will cause a series of performance and safety problems such as increased engine vibration. The design drawings control the coaxiality of the front and rear ends of the casing by the circular runout between the front and rear reference circles and the position of the connecting holes on the front and rear mounting edges. However, when the casing is deformed and not round, the circular runout of the reference circle and the position of the connecting holes cannot intuitively reflect the size of the coaxiality. Furthermore, when the test results are out of tolerance, it is even more difficult to assess the impact of the out-of-tolerance amount on the coaxiality, which creates obstacles for the inspection and acceptance of the casing.

[0057] To achieve the above objectives, this embodiment provides a constraint testing method and device for non-rigid ring parts. Using this method and device, the problems of deformation of the casing in a free state, large differences between the part shape and the theoretical shape in the design drawing, and inability to evaluate the conformity between the physical object and the drawing using the test results can be solved. The test results obtained by this method are stable and reliable, and can ensure the assembly accuracy and usage requirements of the casing.

[0058] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0059] Before designing this inspection method, constraints and inspection requirements under constrained conditions were proposed for the inspection of parts, as follows:

[0060] 1) The constraints during testing are as follows: Using the upper and lower split surfaces 19 of the casing as the reference, the front reference surface A of the front mounting edge 12 of the part is the first constraint surface, the reference hole B adjacent to the front reference surface is the second constraint surface, and the 18 precision holes H on the front mounting edge 12 are the third constraint surface. The back surface P of the front mounting edge 12 is pressed tightly (using 16×M8 bolts through the Φ8.5 bolt holes, tightening torque 14~18Nm); simultaneously, the rear reference surface C of the rear mounting edge 13 of the part is the fourth constraint surface, the reference hole D adjacent to the rear reference surface is the fifth constraint surface, and the 20 precision holes h on the rear mounting edge 13 are the sixth constraint surface. The back surface Q of the rear mounting edge 13 is pressed tightly (using 26×M8 bolts through the Φ8.5 bolt holes, tightening torque 14~18Nm). Figures 2-4 As shown.

[0061] 2) The inspection requirements under constraints include: the positional accuracy of the precision holes H on the front mounting edge 12, using the upper and lower split surfaces 19 of the casing as a reference; the positional accuracy of the precision holes h on the rear mounting edge 13; the coaxiality of the pitch circles DD of the 20 precision holes h on the rear mounting edge 13 with the pitch circles BB of the 18 precision holes H on the front mounting edge 12; the circular runout of the inner surface 18; the flatness of the end face datum A of the front mounting edge 12; the flatness of the end face datum C of the rear mounting edge 13; and the parallelism of the end face datum C of the rear mounting edge 13 with the end face datum A of the front mounting edge 12. Figures 2-4 As shown.

[0062] 3) such as Figure 5 As shown, the front mounting edge 12 of the compressor casing 3 is constrained by the front inspection ring 1, and the position accuracy of the 18 precision holes H on the front mounting edge 12 is checked by the front inspection pin 2.

[0063] 4) such as Figure 5 As shown, a rear inspection ring 4 is used to constrain the rear mounting edge 13 of the compressor casing 3, and a rear inspection pin 5 is used to check the position accuracy of 20 precision holes h on the rear mounting edge 13.

[0064] 5) such as Figure 5 , Figure 6 As shown, the front inspection ring 1 and the rear inspection ring 4 are used for simultaneous constraint. By measuring the coaxiality of the outer reference circle CD of the rear inspection ring 4 with the outer reference circle CB of the front inspection ring 1, the coaxiality of the pitch circle DD of the 20 precision holes h on the rear mounting edge 13 of the compressor casing 3 with the pitch circle BB of the 18 precision holes H on the front mounting edge 12 is indirectly measured.

[0065] 6) such as Figure 5 , Figure 6 As shown, the circular runout of the inner surface 18 of the compressor casing 3 is measured by simultaneously constraining the front inspection ring 1 and the rear inspection ring 4.

[0066] 7) such as Figure 5 , Figure 6As shown, the front inspection ring 1 and the rear inspection ring 4 are used for simultaneous constraint, and the flatness of the front reference surface A and the rear reference surface C of the compressor casing 3 are measured with a 0.02mm feeler gauge.

[0067] 8) such as Figure 5 , Figure 6 As shown, the front inspection ring 1 and the rear inspection ring 4 are constrained simultaneously. By measuring the parallelism between the rear reference surface C of the compressor casing 3 and the front reference surface A, the parallelism between the rear reference surface C and the front reference surface A of the front inspection ring is indirectly measured.

[0068] It should be noted that this testing method is based on "GB / T 16892-1997 Method for Marking Non-rigid Parts with Shape and Position Tolerances". This distinguishes the testing requirements for free and constrained states, and the test results are stable.

[0069] This method introduces constraints that simulate the assembly state of the casing on the engine. The test results can intuitively reflect the accuracy of the casing on the engine. Furthermore, based on the accuracy requirements of the casing on the engine, it proposes test requirements for the casing under constraints, which are consistent with the assembly requirements of the casing on the engine. In particular, it proposes the coaxiality requirements between the pitch circles of the two sets of precision holes on the front and rear mounting edges, which plays an important role in controlling the machining quality of the casing. Using this method helps to ensure the assembly accuracy of parts and improve production efficiency.

[0070] The specific implementation process of this method is described in further detail below:

[0071] I. Constraint Gauge Design

[0072] 1) Front inspection ring and front inspection pin

[0073] In this embodiment, as Figure 7 As shown, the specific structure of the front inspection ring 1 is as follows: In order to detect the coaxiality between the two sets of precision hole pitch circles on the front mounting edge 12 and the rear mounting edge 13, the front inspection ring 1 is designed as a bottom-mounted type, and sufficient operating space is designed in its lower part to ensure convenient insertion of the pin. On the front inspection ring 1, the diameter of the positioning circle of the reference hole B at the front end of the compressor casing 3 is designed according to the maximum material size of the reference hole B. Considering clearance fit and manufacturing tolerance, it is designed as Φ782. -0.01 -0.03 The diameter of the inspection section of the front inspection pin 2 is designed according to the maximum material size and positional accuracy requirements of the precision hole, taking into account manufacturing tolerances and wear limits, and is designed to be Φ8. -0.045 -0.048 The fit between the front inspection pin 2 and the precision hole 1 on the front inspection ring adopts a zero-clearance sliding fit design.

[0074] When checking the position of the precision hole on the front mounting edge 12 of the compressor casing, the front end of the compressor casing 3 is positioned downwards and aligned with the upper end of the front inspection ring 1. The front inspection pin 2 is inserted upwards from the lower part of the front inspection ring 1 into the precision hole on the front mounting edge 12 of the compressor casing 3.

[0075] 2) Rear inspection ring and rear inspection pin

[0076] In this embodiment, as Figure 8 As shown, the specific structure of the rear inspection ring 4 is as follows: the rear inspection ring 4 is an upper-mounted type. On the rear inspection ring 4, the diameter of the positioning circle for the rear end reference hole D of the compressor casing 3 is designed according to the maximum material size of the reference hole D. Considering clearance fit and manufacturing tolerances, it is designed to be Φ754. -0.01 -0.04 The diameter of the inspection section of the rear inspection pin 5 is designed according to the maximum material size and positional accuracy requirements of the precision hole, taking into account manufacturing tolerances and wear limits, and is designed to be Φ8. -0.015 -0.018 The fit between the rear inspection pin 5 and the precision hole on the rear inspection ring 4 adopts a zero-clearance sliding fit design.

[0077] When checking the position accuracy of the precision hole on the rear mounting edge 13 of the compressor casing 3, the rear end face of the compressor casing 3 faces upward, and the lower end of the rear inspection ring 4 is fitted and positioned against the rear end of the compressor casing 3. The rear inspection pin 5 is inserted downward from the upper part of the rear inspection ring 4 into the precision hole of the rear mounting edge 13.

[0078] II. Testing process, combined with Figure 9 As shown:

[0079] The first step is to check the position of the holes on the mounting edge before installation:

[0080] 1) Insert the part with the front mounting edge 12 facing down into the positioning stop of the front inspection ring 1.

[0081] 2) such as Figure 5 As shown, rotate the part (compressor casing 3) to adjust the angle so that the 18 precision holes on the front mounting edge 12 are aligned with the 18 precision holes on the front inspection ring 1. The position of the holes is measured sequentially using the 18 hole position inspection pins 2. If the front inspection pin 2 can be inserted, the hole position is qualified; otherwise, the hole position is unqualified. The front inspection pin 2 that can be inserted is kept on the front inspection ring 1 for subsequent testing.

[0082] Step 2: Press the front mounting edge firmly:

[0083] like Figure 6As shown, 16 M8×55 process bolts (front clamping bolts 6) are used to connect the front inspection ring 1 to the front mounting edge 12 through 16 Φ8.5 bolt holes that are basically evenly distributed on the front mounting edge. After tightening the front clamping bolts 6 through the front washer 7 and the front clamping nut 8, the fit gap between the front end face and the front inspection ring 1 is checked with a feeler gauge. If the feeler gauge cannot pass through 0.02mm, it indicates that the flatness is qualified.

[0084] The third step is to check the positional accuracy of the holes on the mounting side after installation.

[0085] 1) With the locating stop of the rear inspection ring 4 facing down, insert it into the reference hole of the rear mounting edge 13 of the part.

[0086] 2) such as Figure 5 As shown, rotate the rear inspection ring 4 to adjust its angle, aligning the 20 precision holes on the rear inspection ring 4 with the 20 precision holes on the rear mounting edge 13. Then, use the 20 hole position inspection pins 5 to measure the hole position accuracy sequentially. If the inspection pin 5 can be inserted, the hole position accuracy is acceptable; otherwise, it is unacceptable. Retain the insertable inspection pins 5 on the rear inspection ring 4 for subsequent testing.

[0087] Step 4: Install the edges after tightening:

[0088] like Figure 6 As shown, 26 M8×45 process bolts (rear clamping bolts 11) are used to connect the rear inspection ring 4 to the rear mounting edge 13 through 26 Φ8.5 bolt holes that are basically evenly distributed on the rear mounting edge 13. After tightening the rear clamping bolts 11 through the rear clamping nut 9 and the rear washer 10, the fit gap between the rear end face and the rear inspection ring 4 is checked with a feeler gauge. If the feeler gauge cannot pass through 0.02mm, it indicates that the flatness is qualified.

[0089] Fifth step, as Figures 5-6 As shown, the coaxiality between the two sets of precision hole pitch circles on the front and rear mounting edges is checked:

[0090] 1) Hoist the part together with the front inspection ring 1 and the rear inspection ring 4 onto the general inspection turntable.

[0091] 2) Use a dial indicator to align the reference circle of the front inspection ring 1, ensuring that the runout of one circumference is no greater than 0.005, so that it is concentric with the general inspection turntable. Then press the front inspection ring 1 tightly onto the general inspection turntable.

[0092] 3) Use a dial indicator to check the circular runout of the reference circle of the inspection ring 4. The measured value is the coaxiality between the center of the precision hole on the rear mounting edge 13 and the center of the precision hole on the front mounting edge 12.

[0093] Step 6, as follows Figures 5-6 As shown, the circular runout of the inner surface 18 is detected:

[0094] 1) Keep the state from step five unchanged.

[0095] 2) Use a dial indicator or micrometer to check the circular runout of the inner surface 18 of the part, and check it on the front, middle and rear sections respectively.

[0096] Step 7, as Figures 5-6 As shown, the parallelism of the back end face to the front end face is detected:

[0097] 1) Keep the state from step five unchanged.

[0098] 2) Use a dial indicator to test the total runout of the rear end face of the compressor casing 3. The test result is the parallelism between the rear end face of the compressor casing 3 and the front end face of the compressor casing 3.

[0099] The inspection is complete.

[0100] It should be noted that, under the condition of ensuring the above constraints, steps five, six and seven can also be performed on a coordinate measuring machine (CMM). That is, the general inspection turntable in steps five, six and seven can be replaced with a CMM. Using a CMM as the inspection platform can improve the accuracy and efficiency of the inspection.

[0101] The constraint detection method for non-rigid ring components provided in this embodiment has the following beneficial effects:

[0102] 1) The "GB / T 16892-1997 Method for Marking Non-rigid Parts with Shape and Position Tolerances" was adopted, which distinguishes the inspection requirements for free and constrained states, and the inspection results are stable.

[0103] 2) Constraints were proposed to simulate the assembly state of the casing on the engine. The test results can intuitively reflect the accuracy of the casing on the engine.

[0104] 3) Based on the precision requirements of the casing on the engine, inspection requirements for the casing under constrained conditions were proposed, which are consistent with the assembly requirements of the casing on the engine. In particular, the coaxiality requirements between the two sets of precision hole pitch circles on the front and rear mounting edges were proposed, which played an important role in controlling the machining quality of the casing.

[0105] 4) The position of the holes on the mounting side is checked by inspection pins, which avoids the three-coordinate measurement error caused by deformation. The detection method is simple and the detection results are reliable.

[0106] 5) Using the reference circles of the front and rear inspection rings, the coaxiality between the two sets of precision hole pitch circles on the front and rear mounting edges is detected. The measurement method is simple and the measurement accuracy is high.

[0107] In summary, this invention provides a constraint testing method and device for non-rigid ring parts. This testing method applies constraints to the part using front and rear inspection rings, effectively simulating the assembly state of the non-rigid ring part on an engine. Under constraint conditions, the detection results for hole position accuracy, coaxiality, circular runout of the inner surface, and parallelism between the rear end face and the front end face can be obtained. The detection results can intuitively reflect the accuracy of the non-rigid ring part on the engine. This method plays a crucial role in controlling the machining quality of the part by detecting the coaxiality between the two sets of precision hole pitch circles on the front and rear mounting edges. This method solves the problem of non-rigid ring parts deforming in a free state, resulting in excessive shape and position errors exceeding the design drawing tolerances, making inspection and acceptance according to the design drawings impossible. The obtained detection results are stable and reliable, ensuring the assembly accuracy and usage requirements of the non-rigid ring part.

[0108] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A constraint detection method for a non-rigid ring component, characterized in that, include: The position of the holes on the front mounting edge (12) and the rear mounting edge (13) of the part is tested to obtain the hole position test result; the coaxiality between the two sets of precision hole pitch circles on the front mounting edge (12) and the rear mounting edge (13) is tested to obtain the coaxiality test result; the circular runout of the inner surface (18) of the part and the parallelism between the rear end face and the front end face are tested in sequence to obtain the circular runout and parallelism test results; The above steps are all implemented under the constraints of the front inspection loop (1) and the rear inspection loop (4), and the constraints are obtained based on the assembly state of the parts on the engine. The steps for detecting the positional accuracy of the holes on the front mounting edge (12) are as follows: First, with the front mounting edge (12) of the part facing down, insert it into the positioning stop of the front inspection ring (1); The second step is to rotate the parts to adjust the angle, align all the precision holes on the front mounting edge (12) with the precision holes on the front inspection ring (1) one by one, and use inspection pins to measure the position of the precision holes in turn to obtain the position detection results of the front mounting edge holes. After obtaining the position measurement results of the front mounting edge hole, the front inspection ring is connected to the front mounting edge (12) with bolts so that the front end face of the part fits with the front inspection ring (1); The steps for detecting the position accuracy of the hole on the rear mounting edge (13) are as follows: First, with the positioning stop of the rear inspection ring (4) facing down, insert it into the reference hole of the rear mounting edge (13) of the part; The second step is to rotate the rear inspection ring (4) to adjust the angle, align all the precision holes on the rear inspection ring (4) with the precision holes on the rear mounting edge (13) one by one, and use inspection pins to measure the position of the precision holes in turn to obtain the position detection results of the rear mounting edge holes. After obtaining the position accuracy test results of the rear mounting edge hole, the rear inspection ring (4) and the rear mounting edge (13) are connected together with bolts so that the rear end face of the part fits with the rear inspection ring (4).

2. The constraint detection method for a non-rigid ring component according to claim 1, characterized in that, The specific steps for coaxiality testing are as follows: The first step is to hoist the part, along with the front inspection ring (1) and the rear inspection ring (4), onto the inspection turntable; The second step is to find the reference circle of the front inspection ring (1) so that the front inspection ring (1) is concentric with the inspection turntable and press the front inspection ring (1) tightly on the inspection turntable. The third step is to check the circular runout of the reference circle of the rear inspection ring (4) and take the corresponding detection value as the coaxiality of the center of the precision hole on the rear mounting edge (13) and the center of the precision hole on the front mounting edge (12).

3. The constraint detection method for a non-rigid ring component according to claim 1, characterized in that, The steps for detecting the circular runout of the inner surface (18) of the part are as follows: Under coaxiality testing conditions, circular runout is tested at the front, middle and rear sections of the inner surface (18) of the part to obtain the circular runout test results.

4. The constraint detection method for a non-rigid ring component according to claim 1, characterized in that, The steps for detecting the parallelism between the backend and the frontend are as follows: Under coaxiality testing conditions, the full runout of the rear end face of the inspection ring (4) is tested to obtain the parallelism test result.

5. The constraint detection method for a non-rigid ring component according to claim 1, characterized in that, Coaxiality, circular runout, and parallelism are all tested on a coordinate measuring machine.

6. A constraint detection device for a non-rigid ring component, used to implement the constraint detection method for the non-rigid ring component according to any one of claims 1-5, characterized in that, include: The first detection module is used to detect the position of the holes on the front mounting edge (12) and the rear mounting edge (13) of the part, and obtain the hole position detection result; The second detection module is used to detect the coaxiality between the two sets of precision hole pitch circles of the front mounting edge (12) and the rear mounting edge (13) to obtain the coaxiality detection result; The third detection module is used to sequentially detect the circular runout of the inner surface (18) of the part and the parallelism between the rear end surface and the front end surface, and obtain the circular runout and parallelism detection results.

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