High-precision large-diameter fluoroplastic sealing thin-wall workpiece machining method

Abstract

The present application relates to the technical field of machining process, in particular to a high-precision large-diameter fluoroplastic sealing thin-wall workpiece machining method, aiming at machining fluoroplastic sealing thin-wall workpieces with a diameter of more than 200 mm and a wall thickness of 0.2-0.7 mm, comprising the following steps: 1, blanking into a fluoroplastic tubular blank; 2, customizing special tooling; 3, fixing the fluoroplastic tubular blank on the spindle of a numerical control lathe; 4, configuring a numerical control lathe machining tool and preparing a numerical control lathe machining program; 5, machining the inner hole or outer circle of the fluoroplastic sealing thin-wall workpiece, the mating surface with the O-shaped rubber ring and the sealing surface, and reserving a fine turning allowance according to the principle of "double wall thickness priority"; 6, fine turning the inner hole or outer circle of the fluoroplastic sealing thin-wall workpiece and the mating surface with the O-shaped rubber ring; 7, fine turning the sealing surface of the fluoroplastic sealing thin-wall workpiece to ensure the wall thickness; and 8, cutting off the workpiece by using a cutting tool and a surface constant speed and small feed amount turning method.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a high-precision machining method for large-diameter fluoroplastic sealing thin-walled workpieces. Background Technology

[0002] Currently, a crucial factor affecting the lifespan of aviation hydraulic and fuel systems is their sealing devices. The combination of fluoroplastic thin-walled protective rings / slip rings and O-rings is a widely used sealing structure. Fluoroplastic thin-walled protective rings / slip rings not only effectively prevent wear on O-rings, but also allow for automatic compensation of wear through the elasticity of the O-rings. However, if the thickness of the fluoroplastic thin-walled protective ring / slip ring is too large, the elasticity of the O-rings cannot guarantee a tight seal between the sealing surface of the fluoroplastic thin-walled protective ring / slip ring and the sealing shaft / sealing hole of the product. Therefore, wall thickness is a key element in product design.

[0003] High-precision, large-diameter fluoroplastic sealing thin-walled workpieces use materials with low mechanical strength. The selection of cutting parameters has a significant impact on the workpiece's resilience and non-uniformity. When the cutting speed is low and the cutting depth is large, the cut part tilts along the cutting direction and then straightens again after cutting, resulting in poor surface roughness and deviations in size and geometry. Compared with metals, the coefficient of linear expansion of fluoroplastics is (10~12)×10⁻⁶. -5 / K, while the coefficient of linear expansion of steel is (1~2)×10 -5 Fluoroplastics have a thermal conductivity approximately 8 to 10 times that of metals, and their thermal conductivity is also very low, only 1 / 75 to 1 / 450 that of steel. Therefore, the dimensional accuracy of fluoroplastics is highly sensitive to temperature. Conventional turning methods for fluoroplastics often employ large cutting depths. Because the workpiece walls are thin, coolant cannot be used, leading to increased heat in the machining area. Heat removal relies primarily on the cutting tool, which can overheat and stick, severely impacting the surface finish and machining accuracy. Workpiece cutting is also crucial; the quality of the cut surface directly determines the success or failure of the overall machining process. During the rotary cutting process, the thin walls cause the entire workpiece to twist and deform under normal cutting conditions, resulting in uneven thickness and dimensional deviations. Since the workpiece cannot be re-machined after cutting, often the remaining parts are machined to acceptable quality, but improper cutting methods render the workpiece unusable. Therefore, thin walls and cutting are the biggest challenges in machining high-precision, large-diameter fluoroplastic sealing thin-walled workpieces. Conventional processing methods in the industry either fail to produce finished products or produce finished products with uneven wall thickness, resulting in a very low product qualification rate. Summary of the Invention

[0004] The purpose of this invention is to propose a high-precision processing method for large-diameter fluoroplastic sealing thin-walled workpieces, which can ensure uniform wall thickness and achieve a 100% finished product qualification rate.

[0005] The technical solution is as follows:

[0006] A high-precision machining method for large-diameter fluoroplastic sealing thin-walled workpieces, targeting workpieces with diameters exceeding Ф200mm and wall thicknesses of 0.2~0.7mm, includes the following steps:

[0007] Step 1: Cut the fluoroplastic sealed thin-walled workpiece into a fluoroplastic tubular blank according to its dimensions;

[0008] Step 2: Customize special tooling based on the fluoroplastic tubular blank;

[0009] Step 3: Using specialized tooling, fix the fluoroplastic tubular blank onto the spindle of the CNC lathe;

[0010] Step 4: Configure CNC lathe cutting tools according to the shape and dimensional accuracy of the fluoroplastic-sealed thin-walled workpiece, and compile the CNC lathe machining program;

[0011] Step 5: Run the roughing and semi-finishing programs to machine the inner hole or outer circle of the fluoroplastic sealing thin-walled workpiece, the mating surface with the O-ring and the sealing surface, and reserve the finishing allowance according to the principle of "double wall thickness priority";

[0012] Step 6: Run the finishing program and use a diamond-shaped external turning tool or a diamond-shaped internal turning tool to finish the inner hole or outer circle of the fluoroplastic sealing thin-walled workpiece and the mating surface with the O-ring. The machining is done in multiple small feeds. After each turning, use compressed air to cool the diamond-shaped external turning tool or the diamond-shaped internal turning tool.

[0013] Step 7: Run the finishing program and use a diamond-shaped external turning tool or a diamond-shaped internal turning tool to finish the sealing surface of the thin-walled fluoroplastic sealing workpiece to ensure the wall thickness;

[0014] Step 8: Run the cutting-off program and use the cutting-off tool to cut off the workpiece using a constant speed and small feed rate turning method.

[0015] Preferably, the diameter of the sealing surface of the fluoroplastic-sealed thin-walled workpiece exceeds Ф200mm, and the dimensional accuracy tolerance reaches level 7.

[0016] Preferably, in steps 2 and 3, the special tooling is a mandrel fixture or a threaded fixture. When using a mandrel fixture, the inner hole of the fluoroplastic tubular blank is supported by the outer circle of the mandrel fixture, and the fluoroplastic tubular blank is clamped by a CNC lathe three-jaw chuck. When using a threaded fixture, the fluoroplastic tubular blank is tightened by the mating of the internal or external thread of the threaded fixture with the external or internal thread of the fluoroplastic tubular blank, and then the threaded fixture is clamped by a CNC lathe three-jaw chuck.

[0017] Preferably, in step 5, the "double wall thickness priority" principle means that the allowance for precision machining of the inner hole or outer circle of the workpiece, the mating surface with the O-ring, and the sealing surface are all twice the workpiece wall thickness.

[0018] Preferably, in step 6, when precision machining the mating surface of the fluoroplastic sealing thin-walled workpiece and the O-ring, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 35° or an 80° cutting angle is selected according to the space of the mating surface.

[0019] Preferably, when the mating surface space is L-shaped, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 80° is selected; when the mating surface space is U-shaped or inverted U-shaped, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 35° is selected.

[0020] Preferably, in step 7, a rhomboid external turning tool or a rhomboid internal turning tool with an 80° cutting angle is used to finish the sealing surface of the thin-walled fluoroplastic sealing workpiece.

[0021] Preferably, when using a mandrel fixture in step 7, the outer circle of the mandrel fixture supports the inner hole of the fluoroplastic tubular blank. Before precision machining the sealing surface of the thin-walled fluoroplastic sealing workpiece, a temporary process blocking groove is machined radially on the fluoroplastic tubular blank to effectively ensure uniform wall thickness.

[0022] Preferably, in step 8, when running the cutting program and using a cutting tool to cut the workpiece, the surface linear velocity is maintained at machining parameters of V = 150~300m / min and feed rate f = 0.02~0.05mm / r.

[0023] Preferably, the cutting is performed using a cutting tool made of high-speed steel, with a tool rake angle γ = 15° to 25°, a tool clearance angle α = 20° to 30°, and a chip groove R = 5mm to 10mm.

[0024] The beneficial effects of this invention are:

[0025] This invention discloses a high-precision machining method for large-diameter fluoroplastic sealing thin-walled workpieces. The method is designed for fluoroplastic sealing thin-walled workpieces with a diameter exceeding Ф200mm and a wall thickness of (0.2~0.7)mm. The main steps include: first, fixing a fluoroplastic tubular blank onto a CNC lathe spindle using customized tooling; second, rough turning and semi-finish turning of the inner hole or outer diameter, the surface mating with the O-ring, and the sealing surface of the fluoroplastic sealing thin-walled workpiece, reserving a finishing allowance based on the principle of "double wall thickness priority"; third, finish turning of the inner hole or outer diameter and the surface mating with the O-ring, employing a multi-stage, small-feed machining method, using compressed air to cool the cutting tool after each turn; fourth, finish turning of the sealing surface of the fluoroplastic sealing thin-walled workpiece to ensure the wall thickness; and finally, cutting off the workpiece using a surface constant speed, small-feed turning method.

[0026] This invention solves the problem that traditional processing methods cannot guarantee the wall thickness of such high-precision, large-diameter fluoroplastic sealing thin-walled workpieces and have a low finished product qualification rate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the method of the present invention.

[0028] Among them, 1. workpiece, 2-1. mandrel fixture, 3-1. precision turning face diamond turning tool, 3-2. precision turning sealing face diamond turning tool, 4. parting tool;

[0029] Figure 2 This is a schematic diagram of the machining process for an L-shaped fluoroplastic slip ring with a wall thickness of 0.7mm.

[0030] Among them, 1-workpiece, 2-2, thread fitting tool, 3-1, precision turning face diamond turning tool, 3-2, precision turning sealing face diamond turning tool, 4-cut-off tool;

[0031] Figure 3 This is a schematic diagram of the processing of a 0.2mm thick fluoroplastic protective ring in the shape of an inverted U-shape.

[0032] Among them, 1-workpiece, 2-1, mandrel fixture, 3-1, precision turning face diamond turning tool, 3-2, precision turning sealing face diamond turning tool, 4-cut-off tool. Detailed Implementation

[0033] The invention will now be further described with reference to the accompanying drawings:

[0034] The first embodiment of the present invention is described in [reference needed]. Figure 1 A high-precision machining method for large-diameter fluoroplastic sealing thin-walled workpieces, targeting the machining of fluoroplastic sealing thin-walled workpieces with a diameter exceeding Ф200mm and a wall thickness of 0.2~0.7mm, the method comprising:

[0035] Step 1: Cut the fluoroplastic sealing thin-walled workpiece 1 into a fluoroplastic tubular blank according to its dimensions; the diameter of the sealing surface of the fluoroplastic sealing thin-walled workpiece 1 exceeds Ф200mm, and the dimensional accuracy tolerance reaches level 7;

[0036] Step 2: Customize special tooling based on the fluoroplastic tubular blank;

[0037] Specialized tooling is prepared for workpieces of different shapes:

[0038] Among them, the special tooling can be a mandrel clamp 2-1, which supports the inner hole of the fluoroplastic tubular blank through the outer circle of the mandrel clamp 2-1, and clamps the fluoroplastic tubular blank with a CNC lathe three-jaw chuck.

[0039] Among them, the special tooling can be a threaded fixture 2-2. The internal thread of the threaded fixture 2-2 is engaged with the external thread of the fluoroplastic tubular blank to tighten the fluoroplastic tubular blank. Then, the threaded fixture 2-2 is clamped by a three-jaw chuck of a CNC lathe. When the special tooling is the threaded fixture 2-2, the external thread of the threaded fixture 2-2 can also be engaged with the internal thread of the fluoroplastic tubular blank to tighten the fluoroplastic tubular blank. Then, the threaded fixture 2-2 is clamped by a three-jaw chuck of a CNC lathe.

[0040] Step 3: Fix the fluoroplastic tubular blank onto the CNC lathe spindle using customized tooling;

[0041] Step 4: Configure CNC lathe cutting tools according to the shape and dimensional accuracy of the fluoroplastic sealed thin-walled workpiece 1, and compile the CNC lathe machining program, which includes a roughing program, a semi-finishing program, and a finishing program;

[0042] Step 5: Run the roughing and semi-finishing programs to machine the inner hole or outer circle of the fluoroplastic sealing thin-walled workpiece 1, the mating surface with the O-ring, and the sealing surface. Reserve a finishing allowance according to the principle of "double wall thickness priority".

[0043] When roughing and semi-finishing the inner hole and outer circle of a thin-walled fluoroplastic sealing workpiece, allowances for finishing are reserved according to the principle of "double wall thickness priority". The "double wall thickness priority" principle means that the allowances for the inner hole or outer circle, the mating surface with the O-ring, and the sealing surface are twice the workpiece wall thickness. The workpiece wall thickness refers to the thickness between the bottom diameter of the sealing surface and the mating surface of the O-ring.

[0044] Step 6: Run the finishing program and use a diamond-shaped external turning tool or a diamond-shaped internal turning tool to finish the inner hole or outer circle of the fluoroplastic sealing thin-walled workpiece 1 and the surface that mates with the O-ring. During the machining process, use a multi-stage, small-feed machining method. After each turning, use compressed air to cool the diamond-shaped external turning tool or diamond-shaped internal turning tool 3. The surface of the fluoroplastic sealing thin-walled workpiece 1 that mates with the O-ring can be L-shaped, concave, or inverted concave.

[0045] When precision machining the mating surface of the thin-walled fluoroplastic sealing workpiece 1 and the O-ring, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 35° or 80° can be selected based on the space of the mating surface. Figure 1 The precision machining face diamond-shaped turning tool 3-1.

[0046] When precision machining the mating surface of the thin-walled fluoroplastic sealing workpiece 1 and the O-ring, if the mating surface space is L-shaped, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 80° should be selected; if the mating surface space is U-shaped or inverted U-shaped, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 35° should be selected. Figure 1 The precision machining face diamond-shaped turning tool 3-1.

[0047] Step 7: Run the finishing program, using a rhombus-shaped external turning tool or a rhombus-shaped internal turning tool to finish the sealing surface of the thin-walled fluoroplastic seal workpiece, ensuring the wall thickness; use a rhombus-shaped external turning tool or a rhombus-shaped internal turning tool with an 80° cutting angle to finish the sealing surface of the thin-walled fluoroplastic seal workpiece 1, such as... Figure 1 The diamond-shaped lathe tool 3-2 shown is used for precision machining of the sealing surface;

[0048] During the precision machining process, when using the mandrel fixture 2-1, the outer circle of the mandrel fixture 2-1 supports the inner hole of the fluoroplastic tubular blank. Before precision machining the fluoroplastic sealing thin-walled workpiece 1, a temporary process blocking groove is processed radially on the fluoroplastic tubular blank to effectively ensure uniform wall thickness.

[0049] Step 8: Run the cutting program, use the cutting tool 4, and use the surface constant speed and small feed rate turning method to cut the workpiece. The cutting is carried out by the cutting tool (4). The material of the cutting tool (4) is high speed steel, the tool rake angle γ = 15°~25°, the tool clearance angle α = 20°~30°, and the chip groove R = 5mm~10mm.

[0050] The second embodiment of the present invention is:

[0051] This embodiment refers to Figure 2 A method for processing an L-shaped fluoroplastic slip ring with a wall thickness of 0.7mm, wherein the sealing surface diameter is... Inner diameter Processing methods include:

[0052] Step 1: Cut the fluoroplastic sealed thin-walled workpiece 1 into a fluoroplastic tubular blank Ф400×25 according to its dimensions;

[0053] Step 2: Machine the external thread according to the fluoroplastic tubular blank, and customize the thread matching fixture 2-2. Screw the blank into the internal thread of the customized thread matching fixture 2-2.

[0054] Step 3: Fix the custom threaded fixture 2-2 onto the CNC lathe spindle;

[0055] Step 4: Configure CNC lathe cutting tools according to the shape and dimensional accuracy of the fluoroplastic sealed thin-walled workpiece 1, and compile the CNC lathe machining program;

[0056] Step 5: Run the roughing and semi-finishing programs to machine the inner hole, the mating surface with the O-ring, and the sealing surface of the fluoroplastic sealing thin-walled workpiece 1. According to the principle of "double wall thickness priority", a finishing allowance of 1.4mm is reserved for the inner hole, the mating surface with the O-ring, and the sealing surface of the workpiece.

[0057] Step 6: Run the finishing program and use an 80° rhomboid insert internal turning tool to finish turn the inner hole of the fluoroplastic sealing thin-walled workpiece 1 and the mating surface with the O-ring. The turning is done in 4 passes, with feed rates of 0.5mm, 0.5mm, 0.3mm and 0.1mm for each pass. The program pauses after each turn to cool the 80° rhomboid insert internal turning tool with compressed air and clean up the chips.

[0058] Step 7: Run the finishing program and use an external turning tool with an 80° rhomboid insert to finish turn the sealing surface of the thin-walled fluoroplastic sealing workpiece 1. The turning is done in 4 passes, with feed rates of 0.5mm, 0.5mm, 0.3mm and 0.1mm for each pass. The program pauses after each pass to cool the external turning tool with the 80° rhomboid insert and clean up the chips, ensuring a wall thickness of 0.7mm.

[0059] Step 8: Run the cutting program and cut the workpiece using the cutting tool 4 with the surface linear velocity maintained at V = 200 m / min and the feed rate f = 0.03 mm / r.

[0060] The processing method in this embodiment can ensure a workpiece wall thickness of 0.7mm, uniform thickness, and a 100% finished product qualification rate.

[0061] The third embodiment of the present invention is:

[0062] This embodiment refers to Figure 3 A method for processing an inverted U-shaped fluoroplastic slip ring with a wall thickness of 0.2mm, wherein the sealing surface diameter is... Inner diameter Processing methods include:

[0063] Step 1: Cut the fluoroplastic sealed thin-walled workpiece 1 into a fluoroplastic tubular blank Ф240×30 according to its dimensions;

[0064] Step 2: Customize mandrel fixture 2-1 according to the inner diameter of the fluoroplastic tubular blank;

[0065] Step 3: Insert the customized mandrel clamp 2-1 into the inner hole of the fluoroplastic tubular blank, and clamp the fluoroplastic tubular blank with the three-jaw chuck of the CNC lathe;

[0066] Step 4: Configure CNC lathe cutting tools according to the shape and dimensional accuracy of the fluoroplastic sealed thin-walled workpiece 1, and compile the CNC lathe machining program;

[0067] Step 5: Run the roughing and semi-finishing programs to machine the inner hole, the mating surface with the O-ring, and the sealing surface of the fluoroplastic sealing thin-walled workpiece 1. According to the principle of "double wall thickness priority", a finishing allowance of 0.4mm is reserved for the inner hole, the mating surface with the O-ring, and the sealing surface of the workpiece.

[0068] Step 6: Run the finishing program and use an internal turning tool with a 35° rhomboid insert to finish turn the inner hole of the fluoroplastic sealing thin-walled workpiece 1 and the mating surface with the O-ring. The turning is done in two passes, with feed rates of 0.3mm and 0.1mm respectively. The program pauses after each turn to cool the internal turning tool with the 35° rhomboid insert and clean up the chips.

[0069] Step 7: Run the finishing program and use an external turning tool with an 80° rhomboid insert to finish turn the sealing surface of the thin-walled fluoroplastic sealing workpiece 1. The turning is done in two passes, with feed rates of 0.3mm and 0.1mm respectively. The program is paused after each turning pass. Compressed air is used to cool the external turning tool with the 80° rhomboid insert and clean up the chips to ensure a wall thickness of 0.2mm.

[0070] Step 8: Run the cutting program and cut the workpiece using the cutting tool 4 with the surface linear velocity maintained at V = 150 m / min and the feed rate f = 0.02 mm / r.

[0071] The processing method in this embodiment can ensure a workpiece wall thickness of 0.2mm, uniform thickness, and a 100% finished product qualification rate.

Claims

1. A high-precision machining method for large-diameter fluoroplastic sealing thin-walled workpieces, specifically for machining fluoroplastic sealing thin-walled workpieces with a diameter exceeding Ф200mm and a wall thickness of 0.2~0.7mm, characterized in that... Includes the following steps: Step 1: Cut the fluoroplastic sealed thin-walled workpiece into a fluoroplastic tubular blank according to its dimensions; Step 2: Customize special tooling according to the fluoroplastic tubular blank. The special tooling is a mandrel clamp. When using the mandrel clamp, the inner hole of the fluoroplastic tubular blank is supported by the outer circle of the mandrel clamp, and the fluoroplastic tubular blank is clamped by the three-jaw chuck of the CNC lathe. Step 3: Using specialized tooling, fix the fluoroplastic tubular blank onto the spindle of the CNC lathe; Step 4: Configure CNC lathe cutting tools according to the shape and dimensional accuracy of the fluoroplastic-sealed thin-walled workpiece, and compile the CNC lathe machining program; Step 5: Run the roughing and semi-finishing programs to machine the inner hole or outer circle of the fluoroplastic sealing thin-walled workpiece, the mating surface with the O-ring, and the sealing surface. Reserve a finishing allowance according to the "double wall thickness priority" principle. The "double wall thickness priority" principle means that the reserved finishing allowance for the inner hole or outer circle of the workpiece, the mating surface with the O-ring, and the sealing surface are twice the workpiece wall thickness. Step 6: Run the finishing program and use a diamond-shaped external turning tool or a diamond-shaped internal turning tool to finish the inner hole or outer circle of the fluoroplastic sealing thin-walled workpiece and the mating surface with the O-ring. The machining is done in multiple small feeds. After each turning, use compressed air to cool the diamond-shaped external turning tool or the diamond-shaped internal turning tool. Step 7: Run the finishing program and use a diamond-shaped external turning tool or a diamond-shaped internal turning tool to finish the sealing surface of the thin-walled fluoroplastic sealing workpiece to ensure the wall thickness. When using a mandrel fixture, the outer circle of the mandrel fixture supports the inner hole of the fluoroplastic tubular blank. Before finishing the sealing surface of the thin-walled fluoroplastic sealing workpiece, a temporary process blocking groove is machined radially on the fluoroplastic tubular blank to effectively ensure uniform wall thickness. Step 8: Run the cutting-off program and use the cutting-off tool to cut off the workpiece using a constant speed and small feed rate turning method.

2. The method for processing high-precision, large-diameter fluoroplastic sealing thin-walled workpieces according to claim 1, characterized in that, Fluoroplastic seals are used for thin-walled workpieces with sealing surfaces exceeding Ф200mm in diameter, and dimensional accuracy tolerances reach level 7.

3. The method for machining high-precision, large-diameter fluoroplastic sealing thin-walled workpieces according to claim 2, characterized in that, In steps 2 and 3, the special tooling is a threaded fixture. The internal or external thread of the threaded fixture is matched with the external or internal thread of the fluoroplastic tubular blank to tighten the fluoroplastic tubular blank. Then, the threaded fixture is clamped with a three-jaw chuck of a CNC lathe.

4. The method for machining high-precision, large-diameter fluoroplastic sealing thin-walled workpieces according to claim 3, characterized in that, In step 6, when precision machining the mating surface of the fluoroplastic sealing thin-walled workpiece and the O-ring, a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 35° or an 80° cutting angle is selected according to the space of the mating surface.

5. The method for machining a high-precision, large-diameter fluoroplastic sealing thin-walled workpiece according to claim 4, characterized in that, When the mating surface space is L-shaped, select a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 80°; when the mating surface space is U-shaped or inverted U-shaped, select a diamond-shaped external turning tool or a diamond-shaped internal turning tool with a cutting angle of 35°.

6. The method for machining a high-precision, large-diameter fluoroplastic sealing thin-walled workpiece according to claim 5, characterized in that, Step 7: Use a rhombus-shaped external turning tool or a rhombus-shaped internal turning tool with an 80° cutting angle to finish turn the sealing surface of the thin-walled fluoroplastic sealing workpiece.

7. The method for machining a high-precision, large-diameter fluoroplastic sealing thin-walled workpiece according to claim 6, characterized in that, In step 8, the cutting program is run. When cutting with a cutting tool, the surface linear velocity is maintained at V=150~300m / min and the feed rate f=0.02~0.05mm / r to cut the workpiece.

8. A method for machining high-precision, large-diameter fluoroplastic sealing thin-walled workpieces according to claim 7, characterized in that, Cutting is performed using a cutting tool made of high-speed steel with a rake angle γ = 15°~25°, a clearance angle α = 20°~30°, and a chip groove R = 5mm~10mm.

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