Slitting processing device and method for fiber composite material thin-walled cylinder part

Abstract

The invention discloses a slitting machining device and method for a fiber composite material thin-walled cylinder part. The device comprises a lathe three-jaw chuck, a lathe tailstock, a lathe slide carriage, a supporting and positioning sleeve, a cutting motor, a cutting saw blade, a frequency modulator, a dynamometer, a protective cover and the like. The cantilever state of the fiber composite material thin-walled cylinder part is eliminated, the deformation resistance of the fiber composite material thin-walled cylinder part is improved, vibration is greatly reduced, the situation of edge breakage of a notch of the fiber composite material thin-walled cylinder part is improved, meanwhile, the roughness of the surface of the notch is effectively reduced, and the part machining quality and stability are improved; at the moment that the segmented part is separated from the main body of the fiber composite material thin-walled cylinder part, disordered flying of the segmented part is avoided, and the machining safety is improved; due to the fact that limitation of the cantilever state is avoided, the initial length of the fiber composite material thin-walled cylinder part can be further increased, continuous multi-section slitting machining of segmented parts is achieved, repeated disassembly and repeated positioning are not needed, machining efficiency is improved, and meanwhile part machining quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber composite material mechanical processing, and in particular relates to a fiber composite material thin-walled tube slitting processing device and method. Background Art

[0002] Fiber composite materials have excellent properties such as light weight, high strength and strong corrosion resistance, and have been widely used in aerospace, automobile transportation, military and other fields.

[0003] Taking fiber composite thin-walled cylinder as an example, when it needs to be cut, it is usually clamped directly on the three-jaw chuck of the lathe to make the fiber composite thin-walled cylinder in a cantilever state, and then a saw blade cutting machine is used to directly cut the fiber composite thin-walled cylinder in the cantilever state.

[0004] However, when the fiber composite material thin-walled cylinder is processed by the above-mentioned traditional slitting method, since the fiber composite material thin-walled cylinder is in a cantilever state, the fiber composite material thin-walled cylinder is prone to deformation and vibrates more strongly, which can easily lead to chipping of the cut of the fiber composite material thin-walled cylinder, resulting in extremely poor roughness of the cut surface, thereby seriously affecting the processing quality and stability of the parts.

[0005] In addition, when the fiber composite material thin-walled tube is formed into segmented parts after the slitting process, under the cutting force, when the segmented parts are separated from the main body of the fiber composite material thin-walled tube, the segmented parts will fly around disorderly, which will have an adverse effect on processing safety.

[0006] Furthermore, due to the constraints of the cantilever state, the initial length of the fiber composite material thin-walled tube cannot be too long, and when performing multiple repeated cuttings, the fiber composite material thin-walled tube needs to be repeatedly disassembled. Not only is the processing efficiency low, but the positioning accuracy of repeated disassembly is difficult to guarantee, which will also have an adverse effect on the processing quality of the parts. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a fiber composite material thin-walled tube member slitting processing device and method, which eliminates the cantilever state of the fiber composite material thin-walled tube member, improves the deformation resistance of the fiber composite material thin-walled tube member, greatly reduces vibration, improves the edge collapse of the fiber composite material thin-walled tube member, and effectively reduces the roughness of the incision surface, thereby effectively improving the processing quality and stability of the parts; when the segmented parts are separated from the main body of the fiber composite material thin-walled tube member, the disorderly flying of the segmented parts is eliminated, and the processing safety is effectively improved; because it is no longer restricted by the cantilever state, the initial length of the fiber composite material thin-walled tube member can be further increased, and continuous multi-segment slitting processing of the segmented parts can be realized, and there is no need for repeated disassembly and repeated positioning, thereby improving the processing efficiency and further improving the processing quality of the parts.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fiber composite material thin-walled tube slitting processing device, including a lathe three-jaw chuck, a lathe tailstock, a lathe slide, a supporting and positioning sleeve, a cutting motor and a cutting saw blade; one end of the supporting and positioning sleeve is connected to the top of the lathe tailstock, the other end of the supporting and positioning sleeve is connected to one end of the fiber composite material thin-walled tube, and the other end of the fiber composite material thin-walled tube is connected to the lathe three-jaw chuck; the cutting motor is arranged above the lathe slide, and the cutting saw blade is coaxially fixed on the power output shaft of the cutting motor; the control end of the cutting motor is connected to a frequency regulator.

[0009] A lower transfer support plate is fixedly installed horizontally on the upper surface of the lathe slide, a dynamometer is fixedly installed on the upper surface of the lower transfer support plate, and an upper transfer support plate is fixedly installed horizontally on the upper surface of the dynamometer.

[0010] The cutting motor is horizontally fixedly installed on the upper surface of the upper transfer support plate, and the power output shaft of the cutting motor is distributed in parallel with the top of the lathe three-jaw chuck and the lathe tailstock.

[0011] The cutting saw blade is provided with a protective cover which is fixedly connected to the side of the upper transfer support plate.

[0012] The supporting and positioning sleeve adopts a two-stage stepped structure, which is divided into a small-diameter cylinder section and a large-diameter cylinder section; the small-diameter cylinder section and the large-diameter cylinder section are connected by an annular plate section; the inner diameter of the annular plate section is smaller than the inner diameter of the small-diameter cylinder section, and the outer diameter of the annular plate section is larger than the outer diameter of the large-diameter cylinder section.

[0013] The small-diameter barrel section of the supporting and positioning sleeve is coaxially sleeved on the outside of the top cylindrical section of the lathe tailstock, and there is a clearance fit between the small-diameter barrel section and the top cylindrical section; the annular plate section of the supporting and positioning sleeve is coaxially sleeved and pressed against the outer surface of the top conical section of the lathe tailstock; the fiber composite material thin-walled cylinder member is coaxially sleeved on the outside of the large-diameter barrel section of the supporting and positioning sleeve, and there is a clearance fit between the fiber composite material thin-walled cylinder member and the large-diameter barrel section; the barrel mouth of the fiber composite material thin-walled cylinder member is in pressing contact with the annular plate section of the supporting and positioning sleeve.

[0014] Sleeve fastening screws are evenly installed on the small-diameter cylinder section along the circumferential direction, and the sleeve fastening screws are tightly matched with the top cylindrical section of the tailstock of the lathe.

[0015] An annular cutter clearance groove is arranged on the outer surface of the large-diameter cylinder section of the supporting and positioning sleeve, and the width of the annular cutter clearance groove is 5 to 8 times the thickness of the cutting saw blade.

[0016] A fiber composite material thin-walled tube cutting processing method, using the fiber composite material thin-walled tube cutting processing device, comprises the following steps:

[0017] Step 1: Install the selected cutting saw blade onto the power output shaft of the cutting motor, and then install the protective cover to the set position to ensure that the distance of the cutting saw blade protruding from the protective cover meets the needs of subsequent slitting processing;

[0018] Step 2: Put the selected support and positioning sleeve onto the top of the lathe tailstock through the small-diameter cylinder section until the inner side of the annular plate section and the outer surface of the top cone section are pressed against each other, and then tighten the sleeve fastening screws to complete the installation and fixation of the support and positioning sleeve and the top;

[0019] Step 3: Clamp and fix the fiber composite material thin-walled cylinder to be processed onto the three-jaw chuck of the lathe;

[0020] Step 4: Move the lathe tailstock to insert the large diameter barrel section of the supporting and positioning sleeve into the fiber composite thin-walled barrel until the barrel mouth of the fiber composite thin-walled barrel is pressed against the outer side of the annular plate section, and then lock the lathe tailstock to complete the installation and fixation of the fiber composite thin-walled barrel;

[0021] Step 5: Move the lathe slide and adjust the cutting position of the cutting saw blade until the cutting saw blade is aligned with the center of the annular cutter groove;

[0022] Step 6: Start the lathe, adjust the speed of the lathe spindle to the set value, and the lathe spindle drives the lathe three-jaw chuck, fiber composite thin-wall cylinder, supporting and positioning sleeve and center to rotate synchronously at the set speed;

[0023] Step 7: Start the cutting motor, and adjust the speed of the cutting motor to the set value through the frequency regulator, so that the cutting saw blade rotates synchronously at the set speed;

[0024] Step 8: Move the lathe slide at the set cutting feed rate, and the lathe slide drives the cutting saw blade to move synchronously until the cutting saw blade completes the slitting process of the fiber composite material thin-walled tube, and the segmented parts separated from the fiber composite material thin-walled tube will remain on the supporting positioning sleeve;

[0025] Step 9: Move the cutting saw blade back until it is out of the fiber composite thin-walled cylinder, then turn off the lathe and the cutting motor, and then move the lathe tailstock backward to move the large-diameter cylinder section of the supporting positioning sleeve out of the fiber composite thin-walled cylinder, then remove the segmented part from the large-diameter cylinder section, and then inspect the processing quality of the segmented part separately;

[0026] Step 10: Repeat steps 4 to 9 until the slitting process of all the segmented pieces of the fiber composite material thin-walled tube is completed.

[0027] In the process of slitting the fiber composite thin-walled tube by the cutting saw blade, the dynamometer completes the measurement of the normal force and the tangential force at the set sampling frequency and the set sampling time, and the normal force and the tangential force are used as the evaluation indicators of the processing quality; wherein, when the average value of the normal force is ≤10N, when the average value of the tangential force is ≤5N, and when the fluctuation range of the average value of the normal force and the average value of the tangential force is ≤15%, the processing quality is judged to be qualified, otherwise it is unqualified; at the same time, the evaluation indicators of the processing quality also include the edge defect thickness of the parts after slitting and the surface roughness of the cut; wherein, the edge defect thickness of the parts is defined as: the maximum vertical distance from the tangent line of the circle at the undamaged part of the cut surface of the fiber composite thin-walled tube to the deepest part of the damage, when the edge defect thickness of the parts is ≤250μm, the processing quality is judged to be qualified, otherwise it is unqualified; when the cut surface roughness of the fiber composite thin-walled tube is ≤2.5μm, the processing quality is judged to be qualified, otherwise it is unqualified.

[0028] Beneficial effects of the present invention:

[0029] The fiber composite material thin-walled tube member slitting processing device and method of the present invention eliminate the cantilever state of the fiber composite material thin-walled tube member, improve the deformation resistance of the fiber composite material thin-walled tube member, greatly reduce vibration, improve the edge collapse of the fiber composite material thin-walled tube member, and effectively reduce the roughness of the incision surface, thereby effectively improving the processing quality and stability of the parts; when the segmented parts are separated from the main body of the fiber composite material thin-walled tube member, the disorderly flying of the segmented parts is eliminated, and the processing safety is effectively improved; because it is no longer restricted by the cantilever state, the initial length of the fiber composite material thin-walled tube member can be further increased, and continuous multi-segment slitting processing of the segmented parts can be realized, and there is no need for repeated disassembly and repeated positioning, thereby improving the processing efficiency and further improving the processing quality of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a fiber composite material thin-walled tube slitting processing device of the present invention;

[0031] Figure 2 It is a schematic structural diagram of the assembly of the lathe slide and the components thereon of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the combination of the upper transfer support plate and the protective cover of the present invention;

[0033] Figure 4 It is a schematic structural diagram of a combination of a lathe three-jaw chuck, a fiber composite material thin-walled cylinder, a supporting and positioning sleeve, and a lathe tailstock of the present invention;

[0034] Figure 5 for Figure 4 Enlarged view of middle part I;

[0035] Figure 6 Schematic diagram of the part edge defect thickness at the cut surface.

[0036] In the figure, 1 is a three-jaw chuck of a lathe, 2 is a tailstock of a lathe, 3 is a slide of a lathe, 4 is a supporting and positioning sleeve, 5 is a cutting motor, 6 is a cutting saw blade, 7 is a center, 8 is a thin-walled cylinder made of fiber composite material, 9 is a frequency regulator, 10 is a lower transfer support plate, 11 is a dynamometer, 12 is an upper transfer support plate, 13 is a protective cover, 41 is a small-diameter cylinder section, 42 is a large-diameter cylinder section, 43 is an annular plate section, 44 is a sleeve fastening screw, 45 is an annular cutter groove; H is a part edge defect thickness. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1 to 5As shown, a fiber composite material thin-walled tube slitting processing device includes a lathe three-jaw chuck 1, a lathe tailstock 2, a lathe slide 3, a supporting and positioning sleeve 4, a cutting motor 5 and a cutting saw blade 6; one end of the supporting and positioning sleeve 4 is connected to the top 7 of the lathe tailstock 2, and the other end of the supporting and positioning sleeve 4 is connected to one end of a fiber composite material thin-walled tube 8, and the other end of the fiber composite material thin-walled tube 8 is connected to the lathe three-jaw chuck 1; the cutting motor 5 is arranged above the lathe slide 3, and the cutting saw blade 6 is coaxially fixed on the power output shaft of the cutting motor 5; the control end of the cutting motor 5 is connected to a frequency regulator 9.

[0039] In this embodiment, the cutting saw blade 6 adopts an electroplated diamond saw blade, and the cutting saw blade 6 is fixedly connected to the power output shaft of the cutting motor 5 by screws, ER chucks, ER nuts and φ12.7mm saw blade connecting rods; the frequency modulation range of the frequency regulator 9 is 150Hz~250Hz; the cutting motor 5 and the frequency regulator 9 adopt independent power supply mode, and are connected to a 220V AC power supply when starting.

[0040] A lower transfer support plate 10 is fixedly installed horizontally on the upper surface of the lathe slide 3 , a dynamometer 11 is fixedly installed on the upper surface of the lower transfer support plate 10 , and an upper transfer support plate 12 is fixedly installed horizontally on the upper surface of the dynamometer 11 .

[0041] In this embodiment, the surface flatness error of the lower adapter support plate 10 and the upper adapter support plate 12 is ≤0.01mm / m, the dynamometer 11 adopts a three-axis dynamic piezoelectric dynamometer of model 9257B, and the parallelism error of the upper and lower surfaces of the dynamometer 11 is ≤0.02mm / m; the lower adapter support plate 10 and the lathe slide 3, the dynamometer 11 and the lower adapter support plate 10, and the upper adapter support plate 12 and the dynamometer 11 are all fixedly connected by screws.

[0042] The cutting motor 5 is horizontally fixedly installed on the upper surface of the upper adapter support plate 12, and the power output shaft of the cutting motor 5 is distributed parallel to the lathe three-jaw chuck 1 and the top 7 of the lathe tailstock 2.

[0043] In this embodiment, the cutting motor 5 and the upper adapter support plate 12 are fixedly connected by screws.

[0044] The cutting saw blade 6 is provided with a protective cover 13 , and the protective cover 13 is fixedly connected to the side of the upper transfer support plate 12 .

[0045] In this embodiment, the protective cover 13 is square as a whole, and the front end of the protective cover 13 is open for the protrusion of the cutting saw blade 6. The protective cover 13 is provided with a horizontal notch in the middle of the side facing the cutting motor 5 to avoid interference with the power output shaft of the cutting motor 5. An outer extension part that is integrated with the protective cover 13 is provided below the protective cover 13. The outer extension part of the protective cover 13 is fixedly connected to the side of the adapter support plate 12 through an in-line bolt group. The in-line bolt group contains a total of 5 single bolts. The specific installation position of the protective cover 13 can be adjusted according to the size of the cutting saw blade 6 by changing the matching fastening number of the single bolts in the in-line bolt group, so that the size of the cutting saw blade 6 protruding from the protective cover 13 meets the requirements of the slitting process.

[0046] The supporting and positioning sleeve 4 adopts a two-stage stepped structure, which is divided into a small-diameter cylinder section 41 and a large-diameter cylinder section 42; the small-diameter cylinder section 41 and the large-diameter cylinder section 42 are connected by an annular plate section 43; the inner diameter of the annular plate section 43 is smaller than the inner diameter of the small-diameter cylinder section 41, and the outer diameter of the annular plate section 43 is larger than the outer diameter of the large-diameter cylinder section 42.

[0047] In this embodiment, the inner surface of the small-diameter cylinder section 41 has the same diameter as the cylindrical section of the top 7 of the lathe tailstock 2, and a clearance fit is adopted between the two; the inner diameter of the annular plate section 43 is 6 mm smaller than the inner diameter of the small-diameter cylinder section 41, and the outer diameter of the annular plate section 43 is 3 mm larger than the outer diameter of the large-diameter cylinder section 42.

[0048] The small-diameter barrel section 41 of the supporting and positioning sleeve 4 is coaxially sleeved on the outside of the cylindrical section of the top 7 of the lathe tailstock 2, and there is a clearance fit between the small-diameter barrel section 41 and the cylindrical section of the top 7; the annular plate section 43 of the supporting and positioning sleeve 4 is coaxially sleeved and pressed against the outer surface of the conical section of the top 7 of the lathe tailstock 2; the fiber composite material thin-walled barrel member 8 is coaxially sleeved on the outside of the large-diameter barrel section 42 of the supporting and positioning sleeve 4, and there is a clearance fit between the fiber composite material thin-walled barrel member 8 and the large-diameter barrel section 42; the barrel mouth of the fiber composite material thin-walled barrel member 8 is in pressing contact with the annular plate section 43 of the supporting and positioning sleeve 4.

[0049] In this embodiment, the outer diameter of the fiber composite material thin-walled cylinder 8 is φ119mm, the wall thickness of the fiber composite material thin-walled cylinder 8 is 2.5mm, and the length of the fiber composite material thin-walled cylinder 8 is 700mm; the wall thickness of the small diameter cylinder section 41 is 12mm, and the wall thickness of the large diameter cylinder section 42 is 10mm.

[0050] Sleeve fastening screws 44 are evenly installed on the small-diameter cylinder section 41 along the circumferential direction, and the sleeve fastening screws 44 are tightly matched with the cylindrical section of the top 7 of the lathe tailstock 2.

[0051] In this embodiment, a sleeve fastening screw 44 with a diameter of 8 mm is provided every 120° along the circumferential direction, that is, a total of three sleeve fastening screws 44 are provided.

[0052] An annular cutter clearance groove 45 is provided on the outer surface of the large diameter cylinder section 42 of the supporting and positioning sleeve 4 , and the width of the annular cutter clearance groove 45 is 5 to 8 times the thickness of the cutting saw blade 6 .

[0053] In this embodiment, the depth of the annular cutter groove 45 is 5 mm, and the width of the annular cutter groove 45 is 8 mm.

[0054] A fiber composite material thin-walled tube cutting processing method, using the fiber composite material thin-walled tube cutting processing device, comprises the following steps:

[0055] Step 1: Install the selected cutting saw blade 6 onto the power output shaft of the cutting motor 5, and then install the protective cover 13 to the set position, ensuring that the distance of the cutting saw blade 6 protruding from the protective cover 13 meets the needs of subsequent slitting processing;

[0056] In this embodiment, the cutting saw blade 6 is specifically an electroplated diamond saw blade, the thickness of the cutting saw blade 6 is 1 mm, the diameter of the cutting saw blade 6 is 100 mm, and the mesh number of the diamond particles electroplated on the surface of the cutting saw blade 6 is 120 mesh to 150 mesh;

[0057] Step 2: The selected supporting and positioning sleeve 4 is mounted on the top 7 of the lathe tailstock 2 through the small-diameter cylinder section 41 until the inner side of the annular plate section 43 and the outer surface of the conical section of the top 7 are pressed against each other, and then the sleeve fastening screw 44 is tightened to complete the installation and fixation of the supporting and positioning sleeve 4 and the top 7;

[0058] Step 3: Clamp and fix the fiber composite material thin-walled cylinder 8 to be processed onto the three-jaw chuck 1 of the lathe;

[0059] In this embodiment, the clamping force of the lathe three-jaw chuck 1 on the fiber composite material thin-walled cylinder 8 is set to 250N / jaw;

[0060] Step 4: Move the lathe tailstock 2 to insert the large diameter barrel section 42 of the supporting and positioning sleeve 4 into the fiber composite material thin-walled barrel member 8 until the barrel mouth of the fiber composite material thin-walled barrel member 8 abuts against the outer side of the annular plate section 43, and then lock the lathe tailstock 2 to complete the installation and fixation of the fiber composite material thin-walled barrel member 8;

[0061] Step 5: Move the lathe slide 3 to adjust the cutting position of the cutting saw blade 6 until the cutting saw blade 6 is aligned with the center of the annular cutter groove 45;

[0062] Step 6: Start the lathe, adjust the speed of the lathe spindle to the set value, and the lathe spindle drives the lathe three-jaw chuck 1, the fiber composite material thin-walled cylinder 8, the supporting and positioning sleeve 4 and the center 7 to rotate synchronously at the set speed;

[0063] In this embodiment, the speed setting value of the lathe spindle is 40r / min to 80r / min;

[0064] Step 7: Start the cutting motor 5, and adjust the speed of the cutting motor 5 to a set value through the frequency regulator 9, so that the cutting saw blade 6 rotates synchronously at the set speed;

[0065] In this embodiment, the speed setting value of the cutting motor 5 is 3000r / min to 6000r / min;

[0066] Step 8: Move the lathe slide 3 at the set cutting feed rate, and the lathe slide 3 drives the cutting saw blade 6 to move synchronously until the cutting saw blade 6 completes the slitting process of the fiber composite material thin-walled tube 8, and the segmented parts separated from the fiber composite material thin-walled tube 8 will remain on the supporting and positioning sleeve 4;

[0067] Step nine: Move the cutting saw blade 6 backward until it is separated from the fiber composite material thin-walled cylinder 8, then turn off the lathe and the cutting motor 5, and then move the lathe tailstock 2 backward to move the large diameter cylinder section 42 of the supporting positioning sleeve 4 out of the fiber composite material thin-walled cylinder 8, then remove the segmented part from the large diameter cylinder section 42, and then inspect the processing quality of the segmented part separately;

[0068] Step 10: Repeat steps 4 to 9 until the slitting process of all the segmented pieces of the fiber composite material thin-walled tube piece 8 is completed.

[0069] During the slitting process of the fiber composite thin-walled tube 8 by the cutting saw blade 6, the dynamometer 11 completes the normal force F at the set sampling frequency and the set sampling time. y and the tangential force F Z The normal force F y and the tangential force F Z As an evaluation index of processing quality; among them, when the normal force F y When the mean value of ≤10N, when the tangential force F Z When the mean value of is ≤5N, and when the normal force F y The mean value and tangential force F ZWhen the fluctuation range of the mean value is ≤15%, the processing quality is judged to be qualified, otherwise it is unqualified; at the same time, the evaluation index of processing quality also includes the edge defect thickness H of the part after slitting and the surface roughness Ra of the cut; among which, the edge defect thickness H of the part is defined as: the maximum vertical distance from the tangent line of the undamaged part of the cut surface of the fiber composite material thin-walled cylinder 8 to the deepest damage, such as Figure 6 As shown, when the edge defect thickness H of the part is ≤250μm, the processing quality is judged to be qualified, otherwise it is unqualified; when the cut surface roughness Ra of the fiber composite material thin-walled tube 8 is ≤2.5μm, the processing quality is judged to be qualified, otherwise it is unqualified.

[0070] In this embodiment, the sampling frequency setting value of the dynamometer 11 is 1700 Hz, the sampling time setting value of the dynamometer 11 is 0.5 s, and the measured normal force F y The average value is 2.08N, and the measured tangential force F Z The average value is 1.23N; the part edge defect thickness H is obtained by photographing with a VHX-1000C ultra-depth three-dimensional microscope, and the measured maximum value of the part edge defect thickness H is 85.3μm; the incision surface roughness Ra is measured with a TIME3200 handheld surface roughness meter, and the measured incision surface roughness Ra is 1.431μm; after actual measurement and verification, all processing quality assessment indicators are shown to be qualified.

[0071] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. A fiber composite material thin-walled tube slitting processing device, characterized in that: It includes a lathe three-jaw chuck, a lathe tailstock, a lathe slide, a supporting and positioning sleeve, a cutting motor and a cutting saw blade; one end of the supporting and positioning sleeve is connected to the top of the lathe tailstock, the other end of the supporting and positioning sleeve is connected to one end of a fiber composite material thin-walled cylinder, and the other end of the fiber composite material thin-walled cylinder is connected to the lathe three-jaw chuck; the cutting motor is arranged above the lathe slide, and the cutting saw blade is coaxially fixed on the power output shaft of the cutting motor; the control end of the cutting motor is connected to a frequency regulator.

2. A fiber composite material thin-walled tube slitting processing device according to claim 1, characterized in that: A lower transfer support plate is fixedly installed horizontally on the upper surface of the lathe slide, a dynamometer is fixedly installed on the upper surface of the lower transfer support plate, and an upper transfer support plate is fixedly installed horizontally on the upper surface of the dynamometer.

3. A fiber composite material thin-walled tube slitting processing device according to claim 2, characterized in that: The cutting motor is horizontally fixedly installed on the upper surface of the upper transfer support plate, and the power output shaft of the cutting motor is distributed in parallel with the top of the lathe three-jaw chuck and the lathe tailstock.

4. A fiber composite material thin-walled tube slitting processing device according to claim 2, characterized in that: The cutting saw blade is provided with a protective cover which is fixedly connected to the side of the upper transfer support plate.

5. The fiber composite material thin-walled tube slitting processing device according to claim 1, characterized in that: The supporting and positioning sleeve adopts a two-stage stepped structure, which is divided into a small-diameter cylinder section and a large-diameter cylinder section; the small-diameter cylinder section and the large-diameter cylinder section are connected by an annular plate section; the inner diameter of the annular plate section is smaller than the inner diameter of the small-diameter cylinder section, and the outer diameter of the annular plate section is larger than the outer diameter of the large-diameter cylinder section.

6. A fiber composite material thin-walled tube slitting processing device according to claim 5, characterized in that: The small-diameter barrel section of the supporting and positioning sleeve is coaxially sleeved on the outside of the top cylindrical section of the lathe tailstock, and there is a clearance fit between the small-diameter barrel section and the top cylindrical section; the annular plate section of the supporting and positioning sleeve is coaxially sleeved and pressed against the outer surface of the top conical section of the lathe tailstock; the fiber composite material thin-walled cylinder member is coaxially sleeved on the outside of the large-diameter barrel section of the supporting and positioning sleeve, and there is a clearance fit between the fiber composite material thin-walled cylinder member and the large-diameter barrel section; the barrel mouth of the fiber composite material thin-walled cylinder member is in pressing contact with the annular plate section of the supporting and positioning sleeve.

7. The fiber composite material thin-walled tube slitting processing device according to claim 5, characterized in that: Sleeve fastening screws are evenly installed on the small-diameter cylinder section along the circumferential direction, and the sleeve fastening screws are tightly matched with the top cylindrical section of the tailstock of the lathe.

8. The fiber composite material thin-walled tube slitting processing device according to claim 5, characterized in that: An annular cutter clearance groove is arranged on the outer surface of the large-diameter cylinder section of the supporting and positioning sleeve, and the width of the annular cutter clearance groove is 5 to 8 times the thickness of the cutting saw blade.

9. A fiber composite material thin-walled tube cutting processing method, using the fiber composite material thin-walled tube cutting processing device according to claim 1, characterized in that: The steps include: Step 1: Install the selected cutting saw blade onto the power output shaft of the cutting motor, and then install the protective cover to the set position to ensure that the distance of the cutting saw blade protruding from the protective cover meets the needs of subsequent slitting processing; Step 2: Put the selected support and positioning sleeve onto the top of the lathe tailstock through the small-diameter cylinder section until the inner side of the annular plate section and the outer surface of the top cone section are pressed against each other, and then tighten the sleeve fastening screws to complete the installation and fixation of the support and positioning sleeve and the top; Step 3: Clamp and fix the fiber composite material thin-walled cylinder to be processed onto the three-jaw chuck of the lathe; Step 4: Move the lathe tailstock to insert the large diameter barrel section of the supporting and positioning sleeve into the fiber composite thin-walled barrel until the barrel mouth of the fiber composite thin-walled barrel is pressed against the outer side of the annular plate section, and then lock the lathe tailstock to complete the installation and fixation of the fiber composite thin-walled barrel; Step 5: Move the lathe slide and adjust the cutting position of the cutting saw blade until the cutting saw blade is aligned with the center of the annular cutter groove; Step 6: Start the lathe, adjust the speed of the lathe spindle to the set value, and the lathe spindle drives the lathe three-jaw chuck, fiber composite thin-wall cylinder, supporting and positioning sleeve and center to rotate synchronously at the set speed; Step 7: Start the cutting motor, and adjust the speed of the cutting motor to the set value through the frequency regulator, so that the cutting saw blade rotates synchronously at the set speed; Step 8: Move the lathe slide at the set cutting feed rate, and the lathe slide drives the cutting saw blade to move synchronously until the cutting saw blade completes the slitting process of the fiber composite material thin-walled tube, and the segmented parts separated from the fiber composite material thin-walled tube will remain on the supporting positioning sleeve; Step 9: Move the cutting saw blade back until it is out of the fiber composite thin-walled cylinder, then turn off the lathe and the cutting motor, and then move the lathe tailstock backward to move the large-diameter cylinder section of the supporting positioning sleeve out of the fiber composite thin-walled cylinder, then remove the segmented part from the large-diameter cylinder section, and then inspect the processing quality of the segmented part separately; Step 10: Repeat steps 4 to 9 until the slitting process of all the segmented pieces of the fiber composite material thin-walled tube is completed.

10. A fiber composite material thin-walled tube slitting processing method according to claim 9, characterized in that: In the process of slitting the fiber composite thin-walled tube by the cutting saw blade, the dynamometer completes the measurement of the normal force and the tangential force at the set sampling frequency and the set sampling time, and the normal force and the tangential force are used as the evaluation indicators of the processing quality; wherein, when the average value of the normal force is ≤10N, when the average value of the tangential force is ≤5N, and when the fluctuation range of the average value of the normal force and the average value of the tangential force is ≤15%, the processing quality is judged to be qualified, otherwise it is unqualified; at the same time, the evaluation indicators of the processing quality also include the edge defect thickness of the parts after slitting and the surface roughness of the cut; wherein, the edge defect thickness of the parts is defined as: the maximum vertical distance from the tangent line of the circle at the undamaged part of the cut surface of the fiber composite thin-walled tube to the deepest part of the damage, when the edge defect thickness of the parts is ≤250μm, the processing quality is judged to be qualified, otherwise it is unqualified; when the cut surface roughness of the fiber composite thin-walled tube is ≤2.5μm, the processing quality is judged to be qualified, otherwise it is unqualified.

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