Aviation conduit flaring processing and defect detection device and detection method

Abstract

The invention provides an aviation conduit flaring processing and defect detection device and a detection method, and constructs a special conduit flaring detection system based on an eddy current detection technology, and the system comprises a special probe, a special instrument hardware module, a signal processing algorithm and a defect display interface. The special instrument hardware module comprises an excitation unit, the excitation unit comprises a digital frequency synthesizer and a power amplification unit, the digital frequency synthesizer generates a sinusoidal signal, and the sinusoidal signal is amplified by the power amplification unit to obtain an excitation signal. An excitation signal induces eddy current on the inner surface of the conduit flaring conical surface through a built-in coil of the special conical surface detection eddy current probe, and when cracks exist on the inner conical surface of the conduit flaring, the conductivity of a material in a nearby area is changed, so that the detection efficiency is relatively high. By establishing a conduit flaring production and quality inspection system consisting of an automatic flaring processing unit and a defect detection unit, high-quality processing and high-reliability detection of an aviation conduit flaring piece are realized.

Description

Technical Field

[0001] The invention relates to the technical field of expanding processing, performance testing and defect detection of aviation ducts, and in particular to an expanding processing and defect detection device and a detection method for aviation ducts. Background Art

[0002] Aviation conduits are used in aircraft hydraulic systems, air pressure systems, and fuel systems, and are carriers for transporting gases and liquids on aircraft. At present, there are various connection structures for aviation conduits, including: flared connection, non-flared connection, flexible connection, and flange connection. Among them, flared connection is the most widely used and mature connection form. Currently, the hydraulic pipeline systems of aircraft almost all use flared connection.

[0003] Generally, the structure of the expanded catheter includes: catheter expansion, joint, flat nozzle and outer nut. Through the outer nut and the joint, the flat nozzle contacts the outer cone of the catheter, and the joint fits the inner cone of the catheter to achieve pipeline sealing. During the production process, the expansion connection of the catheter will cause various faults due to improper material selection, non-standard production and assembly processes, and the influence of working temperature, catheter frequency and stress. Among them, leakage problems and even damage often occur at the expansion connection. Since the processing procedure of the expansion end of the catheter is a cold working plastic forming process. From a microscopic point of view, a large number of dislocations will be generated on the slip plane and grain boundary of the catheter material, causing the lattice to be distorted and producing a significant work hardening effect; at the same time, the brittle carbide in the material is broken during the expansion process and distributed along the rheological direction. If the expansion deformation process is not properly controlled, crack defects are easily generated at the expansion end of the catheter. Once there is a crack defect in the expansion of the catheter, it will affect its sealing performance, causing leakage problems or even damage. Damage to any catheter may cause a major accident. According to statistics, among the failures of my country's aviation engines, the external duct fracture failure accounts for about half of the total number of structural failures that lead to engine shutdown in the air, and ranks first among structural failures. Therefore, it is extremely important to control the quality of aviation duct expansion processing.

[0004] At present, the automation and intelligence level of the flaring processing equipment for aviation ducts is not high. At the same time, the flaring process and quality inspection are carried out separately, and the production efficiency is low. The flaring processing of aviation ducts is carried out by special equipment. This type of equipment is semi-automatic equipment, with low processing efficiency and general consistency; and the inspection process of flared parts adopts the method of manual visual inspection. The manual visual inspection method is not only inefficient and has a large impact on human factors, but more seriously, it is easy to miss the detection of small cracks that are not easy to detect. Summary of the invention

[0005] In order to address the deficiencies of current technology, the present invention provides a technology and an automated device that combines aviation duct flaring processing with microcrack defect eddy current detection to improve the processing efficiency of aviation duct flaring parts and further improve the production quality of aviation duct flaring parts.

[0006] The technical solution of the present invention is as follows:

[0007] An aviation duct flaring processing and defect detection device includes two systems: an automated flaring processing unit 1 and an intelligent detection unit 2. Figure 1 shown.

[0008] The components of the automated flaring processing unit 1 include: a power head assembly 3, a catheter clamping mechanism assembly 4, a positioning slide assembly 5, a controller assembly 6, an electrical box 7 and a bed assembly 8. Figure 2 shown.

[0009] The power head assembly 3 is characterized in that its structure includes a flaring die 9, a spindle 10, a spindle pulley 11, a toothed belt 12, a motor pulley 13 and a power motor 14. One end of the spindle 10 is connected to the flaring die 9, and the other end is connected to the spindle pulley 11. The motor pulley 13 is installed at the output end of the power motor 14, and is connected to the spindle pulley 11 through the toothed belt 12. The power motor 14 drives the motor pulley 13 to rotate, the motor pulley 13 drives the spindle pulley 11 to rotate, the spindle pulley 11 drives the spindle 10 to rotate, and the spindle 10 drives the flaring die 9 to rotate. The motor pulley 13, the spindle pulley 11 and the toothed belt constitute a belt drive kinematic pair with a certain reduction ratio, such as Figure 3 shown.

[0010] The characteristics of the catheter clamping mechanism assembly 4 are: its structure includes a clamp seat 15, a catheter clamp 25, a mold seat 16, an upper bracket 17, a guide rod 18, a copper sleeve 19, a clamping cylinder 20, a connecting flange 21, a guide rod cylinder 22, a fixing plate 23, a positioning baffle 24, and a catheter clamp 25, such as Figure 4 As shown. The guide rod 18 is mounted on the fixture seat 15, the copper sleeve 19 is mounted on the mold seat 16, and the guide rod 18 and the copper sleeve 19 form a sliding fit. The upper bracket 17 is mounted on the fixture seat 15, the clamping cylinder 20 is mounted on the upper bracket 17, the fixing plate 23 is mounted on the fixture seat 15, and the guide rod cylinder 22 is mounted on the fixing plate 23; the catheter fixture 25 is a two semicircular structure, one of which is mounted on the mold seat 16, and the other semicircle is mounted on the fixture seat 15. The top rod of the clamping cylinder 20 is connected to the mold seat 16 through the connecting flange 21. The system air pressure in the clamping cylinder 20 and the guide rod cylinder 22 is 0.3~0.6MPa; the positioning baffle 24 is mounted on the guide rod cylinder 22.

[0011] The positioning slide assembly 5 is characterized in that its structure includes a servo motor 26, a reducer 27, a ball screw 28, a ball nut 29, a guide rail 30, a slider 31, a slide 32, a dust cover 33, and a base plate 34. The lead of the ball screw 28 is 5 mm, and the reduction ratio of the reducer 27 is 1:10. Figure 5 Two guide rails 30 are installed on a bottom plate 34 , and four sliders 31 are installed on a slide table 32 .

[0012] The controller assembly 6 is characterized in that its structure includes a control box 35, a touch screen 36, a button 37, an indicator light 38, a knob switch 39, and a suspension bracket 40. The control box 35 is connected to the suspension bracket 40, and the suspension bracket 40 is connected to the bed assembly 8.

[0013] The electrical box 7 is characterized in that its components include: PLC, relay, air switch, wire, frequency converter, and solenoid valve.

[0014] The characteristics of the bed assembly 8 are: its main structure is welded by steel plate and steel, and sheet metal side plates are installed on the left, right and back sides. The bed bottom plate 34 has oil retaining edges around it. The bed bottom plate 34 has a bracket connected to the power head assembly 3. A movable protective cover is installed on the bed to prevent splashing of lubricating oil during the expansion process.

[0015] The main structure features of the automatic flaring processing unit are as follows: the positioning slide assembly 5 is installed on the bed bottom plate 34, the power head assembly 3 is installed on the bracket, and the catheter clamping mechanism assembly 4 is installed on the positioning slide assembly 5. The electrical box 7 is embedded in the bed, and the suspension bracket 40 of the controller assembly 6 is installed on the back side plate of the bed assembly 8.

[0016] The components of the intelligent detection unit 2 include: a special cone detection eddy current probe 41, a detection clamping mechanism assembly 42, a detection mechanism assembly 42, a movable slide assembly 44, an eddy current detection instrument 45, a detection electrical cabinet assembly 46, and a detection bed 47. Figure 6 shown.

[0017] The special cone detection eddy current probe 41 is characterized in that the cone angle of the probe is consistent with the angle of the conical surface of the expanded conical surface of the catheter, and a positioning column is designed at the front end of the probe, and the diameter of the positioning column is consistent with the diameter of the inner hole of the catheter. Such a probe structure can ensure that the probe remains coaxial, and the probe coil can fully fit with the expanded conical surface, and can maintain a consistent lifting distance when rotating, such as Figure 7 The probe frequency range is 100~300KHz.

[0018] The feature of the inspection clamping mechanism assembly 42 is that the inspection clamping mechanism assembly has the same structure as the expansion clamping mechanism assembly of the automatic expansion processing unit.

[0019] The feature of the movable slide assembly 44 is that the movable slide assembly 44 has the same structure as the positioning slide assembly 5 of the automatic expansion processing unit.

[0020] The characteristics of the eddy current testing instrument 45 are: the instrument hardware has an independent display, input keyboard and mouse. The instrument has independent selectable frequencies, three automatic frequency mixing units, fast analog digital / analog electronic balance, and adjustable eddy current signal amplitude and phase measurement. The instrument software has configuration analysis functions, non-amplitude phase / amplitude alarm domain, and can realize automatic alarm for crack 52 defects in flaring.

[0021] The characteristics of the detection electrical cabinet assembly 46 are that its components include: PLC, relay, air switch, wire, inverter, solenoid valve.

[0022] The characteristics of the detection bed 47 are: its main structure is welded by steel plate and profile steel, and sheet metal side plates are installed on the left and right sides and the back. A bracket connected to the detection mechanism assembly 42 is provided on the bed bottom plate 34.

[0023] The detection mechanism assembly 42 is characterized in that its structure includes a special cone detection eddy current probe 41, a rotation positioning clamping mechanism 50, and a stepping motor 51. Figure 8 The special cone surface detection eddy current probe 41 is installed on the rotating positioning clamping mechanism 50, and the rotating positioning clamping mechanism 50 is installed on the support. The stepping motor 51 is installed on the rotating positioning clamping mechanism 50 to drive the special cone surface detection eddy current probe 41 to rotate.

[0024] The main structure features of the intelligent detection unit 2 are as follows: the detection mechanism assembly 42 is installed on the bracket of the detection bed 47, the movable slide assembly 44 is installed on the bottom plate 34 of the detection bed 47, and the detection clamping mechanism assembly 42 is installed on the movable slide assembly 44. The detection electrical cabinet assembly 46 is embedded in the detection bed 47, and the fixed bracket of the eddy current detection instrument 45 is installed on the back side plate of the bed, such as Figure 6 shown.

[0025] The intelligent detection unit 2 is also characterized in that it constructs a specialized detection system based on eddy current detection technology, including a dedicated probe, a dedicated instrument hardware module, a signal processing algorithm and a defect display interface. The detection principle is as follows: the dedicated instrument hardware module includes an excitation unit including a digital frequency synthesizer and a power amplifier unit. The digital frequency synthesizer generates a sinusoidal signal, and the sinusoidal signal is amplified by the power amplifier unit to obtain an excitation signal. The excitation signal induces eddy currents on the inner surface of the conical surface of the catheter expansion through the built-in coil 49 of the dedicated conical detection eddy current probe 41. When there is a crack 52 on the inner conical surface of the catheter expansion, the conductivity of the material in the nearby area will change, such as Figure 7The conductivity change signal is then received by the dedicated cone detection eddy current probe 41, converted into a defect signal, and recorded by the instrument's display system, as shown in FIG. Fig. 9 shown.

[0026] An aviation duct expansion and detection method, including a duct expansion processing operation method and a duct expansion detection operation method;

[0027] Catheter expansion processing method:

[0028] According to the catheter expansion process card, the pipe to be expanded is placed on the catheter clamp 25 of the catheter clamping mechanism assembly 4 in the automatic expansion processing unit, so that the end face of the catheter is close to the positioning baffle 24, and the clamping button 37 is pressed. At this time, the clamping cylinder 20 is actuated to clamp the catheter, and the positioning baffle 24 is retracted at the same time;

[0029] Set fast-forward speed, fast-forward distance, working speed, and working distance parameters;

[0030] During the first expansion process, the catheter expansion equipment needs to be taught to correct the working distance so that the expansion size of the catheter meets the processing requirements;

[0031] Use a brush to dip a little lubricating paraffin or engine oil and apply it to the inner surface of the catheter to be expanded and the surface of the expansion mold 9;

[0032] Press the start button 37, the moving slide assembly 44 drives the detection clamping mechanism assembly 42 to move toward the expansion mold 9 of the assembly, and at the same time the power motor 14 of the power head assembly 3 starts, and the expansion mold 9 starts to rotate. When the catheter contacts the expansion mold 9, it is expanded to a certain size. Then, the positioning slide assembly 5 moves in the opposite direction to make the expansion surface of the catheter away from the expansion mold 9, and the expansion process ends;

[0033] After the positioning slide assembly 5 stops moving, the unloading button 37 is pressed, and the clamping cylinder 20 of the catheter clamping mechanism assembly 4 drives the catheter clamp 25 to separate, and the catheter expansion piece 48 is taken out, and the processing is completed.

[0034] Catheter expansion detection operation method:

[0035] The processed expanded part is transferred to the intelligent detection unit 2;

[0036] Place the catheter expansion piece 48 into the fixture of the detection clamping mechanism assembly 42, and press the clamping button 37, at which time the catheter expansion piece 48 is clamped;

[0037] A special conical surface detection eddy current probe 41 matching the size of the catheter is installed on the rotating positioning clamping mechanism 50, and the detection parameters of the eddy current detection instrument 45 are set, including the detection frequency, gain, and initial phase;

[0038] For the first test, the detection sensitivity of the eddy current testing instrument 45 needs to be calibrated. Use a catheter expansion comparison sample with artificial grooves to set the instrument's detection frequency, gain, initial phase and alarm threshold;

[0039] For the first inspection, the moving distance needs to be set. It is advisable to make the special cone surface detection eddy current probe 41 just contact with the conical surface of the catheter expansion, so that the coil protection layer of the special cone surface detection probe and the conical surface of the expanded conduit are kept at a certain lifting distance;

[0040] Press the start detection button 37, and the moving slide assembly 44 drives the detection clamping mechanism assembly 42 to move toward the special cone detection eddy current probe 41. After reaching the preset distance, the special cone detection probe rotates at a certain speed for 1 to 2 circles to complete the detection of the crack 52 on the expanded cone surface of the catheter. When there is a crack 52 defect, the detection instrument will automatically alarm and display the defect signal amplitude diagram, such as Fig. 9 As shown;

[0041] After the detection is completed, the movable slide assembly 44 moves in the reverse direction, so that the catheter expansion piece 48 and the special conical surface detection eddy current probe 41 are separated.

[0042] After the movable slide 32 stops moving, the unloading button 37 is pressed, the clamping cylinder 20 of the detection clamping mechanism assembly 42 drives the catheter clamp 25 to separate, the catheter expansion piece 48 is taken out, and the automatic detection is completed.

[0043] The present invention has the following advantages:

[0044] The present invention combines the automated processing technology of duct flaring with the nondestructive defect detection technology. By establishing an integrated duct flaring processing and quality inspection system consisting of an automated flaring processing unit and a defect detection unit, and formulating a processing operation method and a detection operation method, high-quality processing and automated detection of aviation duct flaring parts are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the automated expansion processing unit and the intelligent detection unit of the present invention;

[0046] Figure 2 It is a schematic diagram of the structure of the automated expansion processing unit of the present invention;

[0047] Figure 3 It is a schematic diagram of the power head assembly structure of the present invention;

[0048] Figure 4 It is a schematic diagram of the structure of the catheter clamping mechanism assembly of the present invention;

[0049] Figure 5 It is a schematic diagram of the structure of the positioning slide assembly of the present invention;

[0050] Figure 6 It is a schematic diagram of the intelligent detection unit of the present invention;

[0051] Figure 7 It is a schematic diagram of the catheter expansion detection principle of the present invention;

[0052] Figure 8 It is a schematic diagram of the assembly structure of the detection mechanism of the present invention;

[0053] Fig. 9 It is a schematic diagram of the expansion defect signal;

[0054] Fig.10 It is a schematic diagram of the expansion die;

[0055] Fig.11 It is a diagram of a flared conduit piece;

[0056] Figure numerals: automated flaring processing unit 1, intelligent detection unit 2, power head assembly 3, catheter clamping mechanism assembly 4, positioning slide assembly 5, controller assembly 6, electrical box 7 and bed assembly 8, flaring mold 9, spindle 10, spindle pulley 11, toothed belt 12, motor pulley 13, power motor 14, fixture seat 15, mold seat 16, upper bracket 17, guide rod 18, copper sleeve 19, clamping cylinder 20, connecting flange 21, guide rod cylinder 22, fixing plate 23, positioning baffle 24, catheter clamp 25, servo motor 26, reduction Machine 27, ball screw 28, ball nut 29, guide rail 30, slider 31, slide 32, dust cover 33, base plate 34, control box 35, touch screen 36, button 37, indicator light 38, knob switch 39, suspension bracket 40, special cone detection eddy current probe 41, detection clamping mechanism assembly 42, detection mechanism assembly 43, mobile slide assembly 44, eddy current detection instrument 45, detection electrical cabinet assembly 46, detection bed 47, catheter expansion piece 48, built-in coil 49, rotation positioning clamping machine 50, stepping motor 51, crack 52. DETAILED DESCRIPTION

[0057] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0058] Example 1

[0059] Take 5 conduits with the specification of φ6x0.6, and perform expansion processing and testing according to the following parameters:

[0060] The original outer diameter D of the tube is 6 mm, the tube wall thickness A is 0.6 mm, the top core angle β is 74°, and the maximum outer diameter Da after expansion is 9.5 mm.

[0061] The components of the automated flaring processing unit 1 include: a power head assembly 3, a catheter clamping mechanism assembly 4, a positioning slide assembly 5, a controller assembly 6, an electrical box 7 and a bed assembly 8. Figure 2 shown.

[0062] According to the process requirements, the expansion die 9 with a top core angle of 74° and a specification of φ6mm are selected to carry out the expansion process of the catheter.

[0063] The power head assembly 3 is characterized in that its structure includes a flaring die 9, a spindle 10, a spindle pulley 11, a toothed belt 12, a motor pulley 13 and a power motor 14. One end of the spindle 10 is connected to the flaring die 9, and the other end is connected to the spindle pulley 11. The motor pulley 13 is installed at the output end of the power motor 14, and is connected to the spindle pulley 11 through the toothed belt 12. The power motor 14 drives the motor pulley 13 to rotate, the motor pulley 13 drives the spindle pulley 11 to rotate, the spindle pulley 11 drives the spindle 10 to rotate, and the spindle 10 drives the flaring die 9 to rotate. The motor pulley 13, the spindle pulley 11 and the toothed belt 12 constitute a belt drive kinematic pair with a certain reduction ratio, such as Figure 3 shown.

[0064] The characteristics of the catheter clamping mechanism assembly 4 are: its structure includes a clamp seat 15, a mold seat 16, an upper bracket 17, a guide rod 18, a copper sleeve 19, a clamping cylinder 20, a connecting flange 21, a guide rod cylinder 22, a fixing plate 23, a positioning baffle 24, and a catheter clamp 25, such as Figure 4 As shown. The guide rod 18 is mounted on the fixture seat 15, the copper sleeve 19 is mounted on the mold seat 16, and the guide rod 18 and the copper sleeve 19 form a sliding fit. The upper bracket 17 is mounted on the fixture seat 15, the clamping cylinder 20 is mounted on the upper bracket 17, the fixing plate 23 is mounted on the fixture seat 15, and the guide rod cylinder 22 is mounted on the fixing plate 23. It is a two semicircular structure, one of which is mounted on the mold seat 16, and the other semicircle is mounted on the fixture seat 15. The top rod of the clamping cylinder 20 is connected to the mold seat 16 through the connecting flange 21. The system air pressure in the clamping cylinder 20 and the guide rod cylinder 22 is 0.3~0.6MPa. The positioning baffle 24 is mounted on the guide rod cylinder 22.

[0065] The positioning slide assembly 5 is characterized in that its structure includes a servo motor 26, a reducer 27, a ball screw 28, a ball nut 29, a guide rail 30, a slider 31, a slide 32, a dust cover 33, and a base plate 34. The lead of the ball screw 28 is 5 mm, and the reduction ratio of the reducer 27 is 1:10. Figure 5 Two guide rails 30 are installed on a bottom plate 34 , and four sliders 31 are installed on a slide table 32 .

[0066] The controller assembly 6 is characterized in that its structure includes a control box 35, a touch screen 36, a button 37, an indicator light 38, a knob switch 39, and a suspension bracket 40. The control box 35 is connected to the suspension bracket 40, and the suspension bracket 40 is connected to the bed assembly 8.

[0067] The electrical box 7 is characterized in that its components include: PLC, relay, air switch, wire, frequency converter, and solenoid valve.

[0068] The characteristics of the bed assembly 8 are: its main structure is welded by steel plate and steel, and sheet metal side plates are installed on the left, right and back sides. The bed bottom plate 34 has oil retaining edges around it. The bed bottom plate 34 has a bracket connected to the power head assembly 3. A movable protective cover is installed on the bed to prevent splashing of lubricating oil during the expansion process.

[0069] The main structure features of the automatic flaring processing unit 1 are as follows: the positioning slide assembly 5 is installed on the bed bottom plate 34, the power head assembly 3 is installed on the bracket, and the catheter clamping mechanism assembly 4 is installed on the positioning slide assembly 5. The electrical box 7 is embedded in the bed, and the suspension bracket 40 of the controller assembly 6 is installed on the back side plate of the bed assembly 8.

[0070] The five catheter parts to be expanded are sequentially placed in the catheter holding mechanism assembly 4. During the expansion process, after the catheter is clamped and positioned on the catheter clamping mechanism assembly 4, the power head rotation speed is set to 200r / min, the moving speed of the positioning slide 5 is set to 70mm / min, the power head assembly 3 drives the expansion die 9 to rotate, and at the same time, the catheter moves toward the expansion die 9 to achieve the effect of "rotation expansion processing". The processing process is shown in the figure. Fig.10 shown.

[0071] The dimensions of the 5 parts after expansion were measured. The maximum outer diameter deviation after expansion was ≤0.02mm, which met the expansion processing quality requirements. The measured dimensions are as follows:

[0072] 1#: Maximum outer diameter after expansion: 9.52mm

[0073] 2#: Maximum outer diameter after expansion: 9.51mm

[0074] 3#: Maximum outer diameter after expansion: 9.51mm

[0075] 4#: Maximum outer diameter after expansion: 9.50mm

[0076] 5#: Maximum outer diameter after expansion: 9.52mm

[0077] A special cone detection eddy current probe 41 matching the specification of the catheter is selected, and its parameters are as follows:

[0078] The cone angle is 74°, the positioning column diameter is 4.8mm, and the frequency is 200KHz.

[0079] The components of the intelligent detection unit 2 include: a special cone detection eddy current probe 41, a detection clamping mechanism assembly 42, a detection mechanism assembly 43, a movable slide assembly 44, an eddy current detection instrument 45, a detection electrical cabinet assembly 46, and a detection bed 47. Figure 6 shown.

[0080] The special cone detection eddy current probe 41 is characterized in that the cone angle of the probe is consistent with the angle of the inner cone of the catheter expansion 48, and a positioning column is designed at the front end of the probe, and the diameter of the positioning column is consistent with the diameter of the inner hole of the catheter. Such a probe structure can ensure that the probe remains coaxial, and at the same time, the probe coil 49 can fully fit with the expansion cone surface, and can maintain a consistent lifting distance when rotating, such as Figure 7 The feature of the inspection clamping mechanism assembly 42 is that the inspection clamping mechanism assembly 42 has the same structure as the expansion clamping mechanism assembly 4 of the automatic expansion processing unit.

[0081] The feature of the movable slide assembly 44 is that the movable slide assembly 44 has the same structure as the positioning slide assembly 5 of the automatic expansion processing unit 1 .

[0082] The characteristics of the eddy current testing instrument 45 are: the instrument hardware has an independent display, input keyboard and mouse. The instrument has 8 independent selectable frequencies, three automatic frequency mixing units, fast analog digital / analog electronic balance, and adjustable eddy current signal amplitude and phase measurement. The instrument software has configuration analysis functions, non-amplitude phase / amplitude alarm domain, and can realize automatic alarm for crack 52 defects in flaring.

[0083] The characteristics of the detection electrical cabinet assembly 46 are that its components include: PLC, relay, air switch, wire, inverter, solenoid valve.

[0084] The characteristics of the detection bed 47 are: its main structure is welded by steel plate and profile steel, and sheet metal side plates are installed on the left and right sides and the back. A bracket connected to the detection mechanism assembly 43 is provided on the bed bottom plate 34.

[0085] The main structural features of the intelligent detection unit 2 are as follows: the detection mechanism assembly 43 is installed on the bracket of the detection bed 47, the movable slide assembly 44 is installed on the bottom plate 34 of the detection bed 47, and the detection clamping mechanism assembly 42 is installed on the movable slide assembly 44. The detection electrical cabinet assembly 46 is embedded in the detection bed 47, and the fixed bracket of the eddy current detection instrument 45 is installed on the back side plate of the bed, such as Figure 6 shown.

[0086] The intelligent detection unit 2 is also characterized in that it constructs a specialized detection system based on eddy current detection technology, including a dedicated probe, a dedicated instrument hardware module, a dedicated signal processing algorithm and a dedicated defect display interface. The detection principle is as follows: the dedicated instrument hardware module includes an excitation unit including a digital frequency synthesizer and a power amplifier unit. The digital frequency synthesizer generates a sinusoidal signal, and the sinusoidal signal is amplified by the power amplifier unit to obtain an excitation signal. The excitation signal induces eddy currents on the inner surface of the conical surface of the catheter expansion through the built-in coil 4948 of the dedicated conical detection eddy current probe 41. When there is a crack 52 on the inner conical surface of the catheter expansion, the conductivity of the material in the nearby area will change, such as Figure 7 The conductivity change signal is then received by the dedicated cone detection eddy current probe 41, converted into a defect signal, and recorded by the instrument's display system, as shown in FIG. Fig. 9 shown.

[0087] Example 2

[0088] The difference from Example 1 is:

[0089] Catheter expansion processing method:

[0090] According to the catheter expansion process card in Table 1, first install the φ6 catheter clamp 25 into the catheter clamping mechanism assembly 4. Place the pipe to be expanded on the catheter clamping mechanism assembly 4 in the automatic expansion processing unit 1, so that the end face of the catheter is close to the positioning baffle 24, and press the clamping button 37. At this time, the clamping cylinder 20 is actuated to clamp the catheter, and the positioning baffle 24 is retracted at the same time;

[0091] Set the fast-forward speed to 300mm / min, fast-forward distance to 75mm, working-feed speed to 50mm / min, working-feed distance to 6mm and other parameters;

[0092] During the first expansion process, the catheter expansion equipment needs to be taught to correct the working distance so that the expansion size of the catheter meets the processing requirements;

[0093] Use a brush to dip a little lubricating paraffin or engine oil and apply it to the inner surface of the catheter to be expanded and the surface of the expansion mold 9;

[0094] Press the start button 37, the moving slide assembly 44 drives the detection clamping mechanism assembly 42 to move toward the expansion mold 9 of the assembly, and at the same time the power motor 14 of the power head assembly 3 starts, and the expansion mold 9 starts to rotate. When the catheter contacts the expansion mold 9, it is expanded to a certain size. Then, the positioning slide assembly 5 moves in the opposite direction to make the expansion surface of the catheter away from the expansion mold 9, and the expansion process ends;

[0095] After the positioning slide assembly 5 stops moving, the unloading button 37 is pressed, and the clamping cylinder 20 of the catheter clamping mechanism assembly 4 drives the separation, the catheter expansion piece 48 is taken out, and the processing is completed.

[0096] The expansion process of 5 catheters was completed in turn according to the above operation method. The dimensions were measured after the expansion. The maximum outer diameter deviation after expansion was ≤0.02mm, which met the expansion process quality requirements. The measured dimensions are shown in Table 1. The expanded catheters are as follows Fig.11 shown.

[0097] Catheter expansion detection operation method:

[0098] A special conical surface detection eddy current probe 41 with parameters as shown in Table 2 is installed on the rotation positioning holding mechanism 48.

[0099] The processed expanded part is transferred to the intelligent detection unit 2;

[0100] Place the catheter expansion piece 48 into the fixture of the detection clamping mechanism assembly 42, and press the clamping button 37, at which time the catheter expansion piece 48 is clamped;

[0101] A special conical surface detection eddy current probe 41 matching the size of the conduit is mounted on the rotation positioning clamping mechanism 48, and the detection parameters of the eddy current detection instrument 45 are set, including the detection frequency being 200KHz;

[0102] For the first test, the detection sensitivity of the eddy current testing instrument 45 needs to be calibrated. A catheter expansion comparison sample with artificial grooves is used. The comparison sample parameters are as follows: groove depth H0.05mm, groove width W<0.02mm, groove length L5 mm;

[0103] At the same time, set the instrument's detection frequency to 200KHz, gain to 28dB, initial phase to 100deg, and alarm threshold to complete the calibration of detection sensitivity;

[0104] For the first inspection, the moving distance needs to be set. It is best to make the special cone surface detection eddy current probe 41 just contact with the conical surface of the catheter expansion, so that the coil protection layer of the special cone surface detection probe 41 and the conical surface of the expanded conduit are kept at a certain distance. The moving distance of this batch of inspections is set to 80mm;

[0105] Press the start detection button 37, and the moving slide assembly 44 drives the detection clamping mechanism assembly 42 to move toward the special cone detection eddy current probe 41. After reaching the preset distance, the special cone detection probe 41 rotates at a certain speed for 1 to 2 circles to complete the detection of the crack 52 on the expanded cone surface of the catheter. When there is a crack 52 defect, the detection instrument will automatically alarm and display the defect signal amplitude diagram, such as Fig. 9 As shown;

[0106] After the detection is completed, the movable slide assembly 44 moves in the reverse direction, so that the catheter expansion piece 48 and the special conical surface detection eddy current probe 41 are separated.

[0107] After the movable slide 32 stops moving, the unloading button 37 is pressed, the clamping cylinder 20 of the detection clamping mechanism assembly 42 drives the separation, the catheter expansion piece 48 is taken out, and the automatic detection is completed.

Claims

1. An aviation duct expansion processing and defect detection device, characterized in that: The aviation duct flaring processing and defect detection device comprises two systems: an automated flaring processing unit (1) (1) and an intelligent detection unit (2); The components of the automated flaring processing unit (1) include: a power head assembly (3), a catheter clamping mechanism assembly (4), a positioning slide assembly (5), a controller assembly (6), an electrical box (7) and a bed assembly (8); The positioning slide assembly (5) is mounted on the bed bottom plate (34), the power head assembly (3) is mounted on the bracket, and the catheter clamping mechanism assembly (4) is mounted on the positioning slide assembly (5); the electrical box (7) is embedded in the bed, and the suspension bracket (40) of the controller assembly (6) is mounted on the back side plate of the bed assembly (8); The components of the intelligent detection unit (2) include: a special cone detection eddy current probe (41), a detection clamping mechanism assembly (42), a detection mechanism assembly (42), a movable slide assembly (44), an eddy current detection instrument (45), a detection electrical cabinet assembly (46), and a detection bed (47); The main structural features of the intelligent detection unit (2) are as follows: the detection mechanism assembly (42) is installed on the bracket of the detection bed (47), the movable slide assembly (44) is installed on the bottom plate (34) of the detection bed (47), and the detection clamping mechanism assembly (42) is installed on the movable slide assembly (44); the detection electrical cabinet assembly (46) is embedded in the detection bed (47), and the fixed bracket of the eddy current detection instrument (45) is installed on the back side plate of the bed.

2. The aviation duct expansion processing and defect detection device according to claim 1, characterized in that: The cone angle of the special cone detection eddy current probe (41) is consistent with the angle of the cone surface inside the expanded opening of the catheter, and a positioning column is designed at the front end of the special cone detection eddy current probe (41), and the diameter of the positioning column is consistent with the diameter of the inner hole of the catheter; The structure of the special cone detection eddy current probe (41) can ensure that the probe remains coaxial, and the probe coil and the expanded cone surface can fully fit together and maintain a consistent lifting distance during rotation. The probe frequency range is 100-300KHz.

3. The aviation duct expansion processing and defect detection device according to claim 1, characterized in that: The structure of the detection clamping mechanism assembly (42) is consistent with that of the expansion clamping mechanism assembly of the automated expansion processing unit (1).

4. The aviation duct expansion processing and defect detection device according to claim 1, characterized in that: The intelligent detection unit (2) constructs a specialized detection system based on eddy current detection technology, including a dedicated probe, a dedicated instrument hardware module, a signal processing algorithm and a defect display interface; The dedicated instrument hardware module comprises an excitation unit including a digital frequency synthesizer and a power amplifier unit. The digital frequency synthesizer generates a sinusoidal signal. The sinusoidal signal is amplified by the power amplifier unit to obtain an excitation signal. The excitation signal induces eddy currents on the inner surface of the conical surface of the expanded conical surface of the conduit through a built-in coil (49) of a dedicated conical surface detection eddy current probe (41). When a crack (52) exists on the conical surface of the expanded conical surface of the conduit, the conductivity of the material in the vicinity will change. The conductivity change signal is then received by the dedicated conical surface detection eddy current probe (41), converted into a defect signal, and recorded by the display system of the instrument.

5. A detection method for the aviation duct expansion processing and defect detection device according to claim 1, characterized in that: include: Catheter expansion processing operation method and catheter expansion detection operation method; Catheter expansion processing method: According to the catheter expansion process card, the pipe to be expanded is placed on the catheter clamp (25) of the catheter clamping mechanism assembly (4) in the automatic expansion processing unit, so that the end face of the catheter is close to the positioning baffle (24), and the clamping button (37) is pressed. At this time, the clamping cylinder (20) is actuated to clamp the catheter, and the positioning baffle (24) is retracted at the same time; Set fast-forward speed, fast-forward distance, working speed, and working distance parameters; During the first expansion process, the catheter expansion equipment needs to be taught to correct the working distance so that the expansion size of the catheter meets the processing requirements; Using a brush to dip lubricating paraffin or engine oil, apply it to the inner surface of the conduit to be expanded and the surface of the expansion mold (9); The start button (37) is pressed, and the moving slide assembly (44) drives the detection clamping mechanism assembly (42) to move toward the expanding mold (9) of the assembly, and at the same time, the power motor (14) of the power head assembly (3) is started, and the expanding mold (9) begins to rotate; when the catheter contacts the expanding mold (9), it is expanded to a certain size; then, the positioning slide assembly (5) moves in the opposite direction, so that the expanding surface of the catheter is away from the expanding mold (9), and the expanding process is completed; After the positioning slide assembly (5) stops moving, the unloading button (37) is pressed, and the clamping cylinder (20) of the catheter clamping mechanism assembly (4) drives the catheter clamp (25) to separate, and the catheter expansion piece (48) is taken out, and the processing is completed; Catheter expansion detection operation method: Transferring the processed expanded part to the intelligent detection unit (2); The catheter expansion piece (48) is placed in the fixture of the detection clamping mechanism assembly (42), and the clamping button (37) is pressed, and the catheter expansion piece (48) is clamped; A special conical surface detection eddy current probe (41) matching the size of the catheter is installed on a rotating positioning clamping mechanism (50), and detection parameters of the eddy current detection instrument (45) are set, including detection frequency, gain, and initial phase; For the first test, the detection sensitivity of the eddy current detection instrument (45) needs to be calibrated; a comparison sample of a catheter expansion with artificial grooves is used to set the detection frequency, gain, initial phase and alarm threshold of the instrument; For the first inspection, the moving distance needs to be set; it is preferable that the special conical surface inspection eddy current probe (41) is in just contact with the conical surface of the expanded conical surface of the conduit, so that the coil protection layer of the special conical surface inspection probe and the conical surface of the expanded conduit are kept at a certain lifting distance; The detection start button (37) is pressed, and the movable slide assembly (44) drives the detection clamping mechanism assembly (42) to move toward the special cone detection eddy current probe (41); after reaching the preset distance, the special cone detection probe rotates at a certain speed for 1 to 2 circles to complete the detection of the crack (52) on the expanded cone surface of the catheter; when the crack (52) defect is present, the detection instrument will automatically alarm and display the defect signal amplitude diagram; After the detection is completed, the movable slide assembly (44) moves in the reverse direction, so that the catheter expansion piece (48) and the special cone surface detection eddy current probe (41) are separated; After the movable slide (32) stops moving, the unloading button (37) is pressed, and the clamping cylinder (20) of the detection clamping mechanism assembly (42) drives the catheter clamp (25) to separate, and the catheter expansion piece (48) is taken out, and the automatic detection is completed.

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