Method for processing high-precision thin-walled high-temperature alloy material pipe joint

Abstract

The application discloses a kind of high-precision thin-walled high-temperature alloy material pipe interface processing method, comprising, step one, clamping pipe interface assembly, clamping plate is welded with pipe interface assembly, wherein the clamping plate includes base, rib plate, stand and pressing plate, one side end surface and the lower end surface of mounting plate between stand form a gap, and then along the circumferential profile of mounting plate interval welding, pressing plate is tightly pressed on the upper end surface of mounting plate, then through base and machine tool worktable connection;Step two, milling and boring pipe interface, milling object is the inner surface of pipe interface, outer surface, when milling, adopt the combination mode of rough milling, semi-finish milling and finish milling;Boring object is the inner hole of pipe interface, when boring, adopt the combination mode of rough boring, semi-finish boring and finish boring.The application effectively reduces the deformation amount in the process of thin-walled part machining, effectively controls the machining size, improves the processing qualified rate, and reduces the consumption of tool.

Description

Technical Field

[0001] This invention belongs to the field of aerospace mechanical processing technology, and in particular, it is a processing method for high-precision thin-walled high-temperature alloy material pipe interfaces. Background Technology

[0002] like Figure 1 As shown, this is a high-precision thin-walled high-temperature alloy pipe interface component for an aviation radiator system. The component is characterized by its irregular shape, large nozzle size, and close distance between the nozzle interface and the weld. Structurally, the component is a thin-walled part. After welding, the assembly is under stress, which easily leads to deformation after stress release, resulting in large changes in dimensional accuracy. Furthermore, the machining process of thin-walled parts is prone to machining deformation and vibration, which increases the difficulty of ensuring dimensional and surface quality. The final result is not only an extremely low production qualification rate (less than 50%), but also a large consumption of cutting tools.

[0003] Specifically, the material used for this pipe interface component is GH3625, which is a solid solution strengthened nickel-based high-temperature alloy. The difficulties in milling components made of this material lie in the following aspects:

[0004] 1. GH3625 has good plasticity and high strength, and still has high strength at high temperatures.

[0005] 2. The cutting force is large during cutting, the cut hardening is severe, and the cutting process of the equipment consumes a lot of cutting energy.

[0006] 3. GH3625 has poor thermal conductivity, resulting in high cutting temperatures at the cutting edge (around the cutting edge). Under high temperatures, adhesive wear and diffusion wear of the cutting tool are aggravated, which can easily cause micro-cracks in the cutting edge and eventually lead to chipping.

[0007] 4. GH3625 has a high tendency to stick during the cutting process, which easily produces built-up edge. The cutting temperature is high, the sticking phenomenon is serious, and the cutting edge of the tool is easily worn.

[0008] 5. GH3625 exhibits significant vibration during machining.

[0009] On the other hand, from the perspective of the structure of the components, the difficulties in their processing are manifested in the following aspects:

[0010] 1. The component structure belongs to the hollow thin-walled series, and the milling part of the pipe interface is far from the fixed clamping position, making it difficult to achieve rigid support for the workpiece during positioning and clamping.

[0011] 2. The dimensions and shape accuracy requirements of the component pipe interface processing elements are high. The thin walls and hollow parts result in severe cutting vibration and poor surface quality.

[0012] 3. The component structure is a welded assembly. The pipe interface (finished part) is close to the weld, and there is stress due to heat-affected zone changes. After the stress is released, it is easy to deform, resulting in large dimensional changes. The heat-affected zone causes unstable cutting force and significant machining vibration.

[0013] For the reasons mentioned above, it is necessary to adopt a series of targeted measures during the processing. Summary of the Invention

[0014] To address the aforementioned problems, this invention aims to provide a high-precision machining method for thin-walled high-temperature alloy pipe interfaces, effectively reducing deformation during the machining process of thin-walled parts, achieving effective control of machining dimensions, improving machining pass rate, and reducing tool consumption.

[0015] This invention is achieved through the following technical solution:

[0016] A processing method for high-precision thin-walled high-temperature alloy pipe interfaces, wherein the pipe interface, mounting plate, and interface housing constitute a pipe interface assembly. The pipe interface, mounting plate, and interface housing are made of GH3625 stainless steel. The interface housing is a variable cross-section, hollow thin-walled structure. Both ends of the interface housing are connected to the mounting plate and the pipe interface, respectively. The cross-section of the interface housing gradually decreases from one end of the mounting plate until it is welded to the pipe interface. The inner surface, outer surface, and inner hole of the pipe interface are the locations to be processed. The processing method includes...

[0017] Step 1: Install the pipe interface assembly. The mounting plate is welded to the pipe interface assembly. The mounting plate includes a base, ribs, vertical plates, and pressure plates. The vertical plates are vertically connected to the base. The ribs are connected to both the base and the vertical plates. The cross-section of the ribs gradually increases from the end closest to the pipe interface to the end furthest from the pipe interface. A gap is formed between one side end face of the vertical plate and the lower end face of the mounting plate. The ribs are then welded along the circumferential contour of the mounting plate at intervals. The pressure plates are pressed against the upper end face of the mounting plate. Finally, the mounting plate is connected to the machine tool worktable through the base.

[0018] Step two, machining the pipe interface, including milling and boring, wherein,

[0019] The milling objects are the inner and outer surfaces of the pipe interface. During milling, a combination of rough milling, semi-finish milling, and finish milling is used.

[0020] The object being bored is the inner hole of the pipe interface. During boring, a combination of rough boring, semi-finish boring, and finish boring is used.

[0021] Furthermore, in step one, the side end face area of ​​the upright plate is larger than the lower end face area of ​​the mounting plate, and the side end face of the upright plate and the lower end face of the mounting plate are connected by spot welding, with the weld points arranged at equal intervals along the circumferential outline of the mounting plate.

[0022] Furthermore, in step one, the side end face accuracy of the upright plate is IT5 to IT6, the roughness is 0.63 to 0.08 μm, the flatness is 0.55 to 0.03 mm, and the flatness error is M. 工 =0.55~0.03mm, and the gap thickness C between the side end face of the upright plate and the bottom end face of the mounting plate is 5~10mm.

[0023] Furthermore, prior to step two, the material with supporting and vibration-absorbing functions is filled into the gap between the side end face of the upright plate and the lower end face of the mounting plate, the interface housing, and the pipe interface cavity.

[0024] Furthermore, in step two, the rough milling speed V C =15~35m / min, finish milling speed V C =30~50m / min, rough milling feed rate F 粗 =0.2~0.4mm / Z, finish milling feed rate F 精 =0.08~0.18mm / Z, when milling in layers, the depth of cut for each layer is 0.3~1.5mm, and the tangential entry of the arc trajectory is used during milling, with the arc trajectory R=8~20mm.

[0025] Furthermore, in step two, the cutting tool material for milling and boring is an ultrafine particle cemented carbide bar. The mass percentage of the main elements in the bar is: tungsten 87%, cobalt 12%, and the diameter of the powder particles in the bar is ≤0.005mm, and the hardness HV≥1600.

[0026] Furthermore, in step two, the surfaces of the milling and boring tools are coated with a titanium aluminum nitride silicon coating, and the coating thickness is 0.002 mm to 0.005 mm.

[0027] Furthermore, in step two, the tool geometry parameters for milling and boring satisfy the following: the tool rake angle is 3°–10°, the tool clearance angle is 3°–15°, the helix angle is 35°–65°, and the tool tip radius is R. 粗 =5.5mm~0.5mm, R 精 =1mm~0.1mm, cutting edge Z=3~8.

[0028] Furthermore, in step two, the tool clamping for milling and boring satisfies the condition that the tool extension length δ is less than 7 times the minimum tool diameter D. 刀 The circular runout η of the tool assembly is ≤0.01mm.

[0029] Furthermore, in step two, the design and manufacture of the milling and boring machine tools conform to ISO international standards. The repeatability of the X / Y / A / C axis positioning accuracy is ≤ 1 / 3 to 1 / 5 of the dimensional accuracy of the machined elements of the part. The machine tool position accuracy acceptance standard adopts VDI / 3441. The machine tool geometric accuracy is performed in accordance with the general rules for metal cutting machine tools JB2670-82 and ISO230-1-96. Before the machine tool is started for machining, it is pre-run for 0.3 to 0.5 hours. The spindle speed is S300 to S2000 rpm, the feed rate is F300 to F2000 mm / min, the machining stroke X / Y / Z = Xmax / Ymax / Z100 to 300, the machine tool spindle rotation accuracy L ≤ 0.006 mm, the machining datum coincides with the programming datum, and the X and Y coincidence error ε ≤ 0.01 mm.

[0030] The processing method of this invention solves the technical problem of poor quality stability of high-precision, thin-walled, irregularly shaped high-temperature alloy material pipe interface components in radiator system products. By optimizing processing steps, rationally designing tooling positioning requirements, optimizing the selection of tool geometry parameters, optimizing processing cutting parameters and allowances, the deformation of thin-walled parts during processing is reduced, and the machining dimensions are effectively controlled.

[0031] The processing method of the present invention has the following characteristics:

[0032] (1) Based on the material and structural characteristics of the pipe interface components, the machining steps are optimized by adopting the steps of rough milling of the outer and inner surfaces → semi-finish milling of the outer and inner surfaces → finish milling of the outer and inner surfaces, followed by rough boring, semi-finish boring and finish boring of the inner hole;

[0033] (2) Select the mounting plate of the pipe interface assembly as the clamping plane connection, and improve the clamping rigidity and strength of the pipe interface assembly by welding;

[0034] (3) Based on the force characteristics of the pipe interface on the mounting plate during milling and boring (alternating tension and pressure), a rib plate was designed on one side of the mounting plate upright plate, which serves as a tooling fixture, so that the mounting plate and upright plate, which serve as the reference plane, always remain unchanged or have small deformation.

[0035] (4) In order to reduce the deformation tendency of the pipe interface, the best machining position is to place the axis of the pipe interface vertically (vertical milling). However, due to the structural characteristics of the pipe interface assembly, its center of gravity is biased towards the pipe interface. After being connected to the machine tool table, its center of gravity is too high, which makes it easy to bend due to cutting torque. This invention reduces the center of gravity of the tooling fixture after being connected to the pipe interface assembly by designing ribs, vertical plates and base, thus reducing the possibility of bending deformation.

[0036] (5) Leave a gap between the upright plate and the mounting plate. On the one hand, this is to allow space for deformation and correction during welding. On the other hand, it is to fill the gap with some vibration damping material to reduce the transmission of vibration between the two.

[0037] (6) Based on the material properties of GH3625, titanium aluminum silicon nitrogen (TiAlSiN) was selected as the coating material for the cutting tool, and the composition, particle diameter, geometric parameters, and runout value of the tool assembly were optimized.

[0038] (7) In view of the characteristics of the pipe interface component, such as hollow thin wall, close to the weld and welding thermal stress, the feed rate, feed direction and cutting trajectory in the milling process were optimized. At the same time, the combination of macro program and ISO program was used in the machining process.

[0039] Compared with existing technologies, the method of this invention for processing pipe interface components not only improves the quality stability of high-precision thin-walled high-temperature alloy pipe interface parts for aerospace radiator systems, ensuring product quality, performance, and design requirements, but also lays the foundation for improving high-precision cutting methods and process parameters for thin-walled structural components made of difficult-to-machine materials. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a high-precision thin-walled high-temperature alloy pipe interface component;

[0041] Figure 2 This is a schematic diagram showing the state of a high-precision thin-walled high-temperature alloy material pipe interface clamped on a fixture;

[0042] In the diagram: 1-Mounting plate; 2-Interface housing; 3-Pipe interface; 4-Pressure plate; 5-Upright plate; 6-Rib plate; 7-Base. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0044] Analysis of the difficulties in machining the parts in this invention:

[0045] 1. According to the appendix Figure 1 The structure of this part is typical of thin-walled parts, which are extremely prone to deformation during clamping and machining.

[0046] 1) The components have irregular shapes, large nozzle sizes, and short distances between nozzle interfaces and welds.

[0047] 2) The assembled components of thin-walled structural parts are under stress after welding. After the stress is released, they are prone to deformation, resulting in large changes in size and shape accuracy.

[0048] 3) The component structure belongs to the hollow thin-walled series, and the milling part of the pipe interface is far from the fixed clamping position, making it difficult to achieve rigid support for the part during positioning and clamping.

[0049] 4) The dimensions and shape of the components and pipe interfaces have high precision requirements. The parts are thin-walled hollow structures, which cause severe vibration during the cutting process and make it difficult to guarantee the surface quality of the machined parts.

[0050] 2. Materials of components:

[0051] The component is made of GH3625, a solid solution strengthened nickel-based superalloy. The difficulty in milling this component lies in the characteristics of GH3625 material:

[0052] 1) GH3625 material has good plasticity and high strength, and still maintains high strength at high temperatures. During cutting, it has high resistance to plastic deformation, the cutting part of the tool bears a large cutting load, and the cutting temperature is extremely high.

[0053] 2) GH3625 material has a large cutting force when cutting (50% higher than 45# steel), severe cut hardening (the surface hardening is 2 to 5 times that of the base material), and the surface hardened layer thickness is about 0.08mm to 0.14mm. The cutting process consumes a lot of cutting energy.

[0054] 3) GH3625 material has poor thermal conductivity, which is only 1 / 5 to 1 / 2 that of 45# steel. Therefore, the cutting temperature of the cutting part of the tool (around the cutting edge) is high. Under high temperature, the adhesive wear and diffusion wear of the cutting tool are aggravated, which can easily cause micro-cracks in the cutting edge and eventually lead to chipping.

[0055] 4) Solid solution strengthened nickel-based superalloys have a high tendency to stick during tool cutting, easily producing built-up edge, resulting in high cutting temperatures, severe tool sticking, and rapid wear of the cutting edge. This affects the sharpness of the cutting tool and the surface quality of the machined surface.

[0056] To achieve high-quality processing, the present invention has been improved and adjusted in the following aspects:

[0057] 1. Selection and application of processing equipment:

[0058] 1) Machining center machine tools: The design and manufacture of the machine tool shall conform to ISO international standards. The repeatability of the positioning accuracy shall meet the requirement that the positioning accuracy of the X / Y / A / C axes ≤ the dimensional accuracy of the machined elements of the part / 3~5 (VDI / DGQ 3441~ISO230~2 norms). The machine tool position accuracy acceptance standard adopts VDI / 3441. The geometric accuracy of the machine tool shall comply with the general rules for metal cutting machine tools JB2670-82 (ISO230-1-96).

[0059] 2) Before starting machining, the machining center should be pre-run for 0.3 to 0.5 hours, with spindle speed S300 to S2000 rpm, feed rate F300 to F2000 mm / min, and machine travel X / Y / Z = X maximum / Y maximum / Z 100 to 300.

[0060] 3) Machine tool spindle accuracy calibration: Use a dial indicator to measure the rotational accuracy of the machine tool spindle L≤0.006mm.

[0061] 2. Machining reference and programming reference settings:

[0062] The machining datum coincides with the programming datum, and the X and Y overlap error ε ≤ 0.01mm.

[0063] 3. Proper clamping of the cutting tool;

[0064] 1) When clamping the tool, the tool extension length (δ) should be less than 7 times the minimum tool diameter (D). 刀 Then δ≤7D 刀 .

[0065] 2) When clamping the tool, the circular runout (η) of the tool assembly should be controlled. The circular runout η of the tool assembly should be ≤0.01mm.

[0066] 4. Improve the structural rigidity during component manufacturing:

[0067] The clamping plate includes a base 7, a rib 6, a vertical plate 5, and a pressure plate 4. The vertical plate 5 is vertically connected to the base 7. The rib 6 is connected to both the base 7 and the vertical plate 5. The cross-section of the rib 6 gradually increases from the end closest to the pipe interface 3 to the end furthest from the pipe interface 3. A gap is formed between one side end face of the vertical plate 5 and the lower end face of the mounting plate 1, and the rib 6 is welded along the circumferential contour of the mounting plate 1 at intervals. The pressure plate 4 is pressed against the upper end face of the mounting plate 1 and then connected to the machine tool worktable through the base 7.

[0068] 1) Selection of clamping plate: The clamping plate should be made of 45# steel with a thickness δ≥8mm. The clamping plate size should be increased by S≥350×230, and the flatness of the clamping surface should be 0.55mm~0.03mm.

[0069] 2) The mounting plate and the components are connected by welding. The distance between the welding points is L = 20~100mm. The welding points are firm. The gap between the components and the mounting plate is C = 5~10mm.

[0070] 5. Selection of positioning surfaces for the clamping plate:

[0071] The positioning surface of the clamping plate can be flat or curved. In this invention, a flat surface (vertical plate 5) is selected as the positioning surface to ensure the cleanliness of the positioning surface.

[0072] 1) The positioning surface accuracy of the clamping plate is IT5~IT6, and the roughness is 0.63~0.08um.

[0073] 2) Flatness error of the positioning surface of the clamping plate (M) 工 )M 工 =0.55~0.03mm.

[0074] 6. Appropriate amounts of cavity support or other shock-absorbing materials may be filled into the cavity of the clamping plate and components to reduce cutting vibration. The filling position should be as close as possible to the cutting part in the cavity of the clamping plate and components.

[0075] 7. Improve tool cutting performance:

[0076] Specialized cutting tools are designed and customized based on the machinability of high-temperature alloy materials, the structural characteristics of components, and technological requirements. These tools must maintain a sharp cutting edge, exhibit impact resistance, and provide good cutting stability under high-temperature conditions. In particular, roughing operations require strong load-bearing capacity and impact resistance, high-temperature resistance, good tool tip dispersion, and a coating with good thermal insulation and high rigidity. Meanwhile, finishing operations require excellent machinability, wear resistance, and dimensional stability.

[0077] 1) Tool material requirements: Use ultra-fine particle cemented carbide rods with the following content (mass percentage): tungsten 87%, cobalt 12%, powder particle diameter ≤0.005mm, hardness HV≥1600.

[0078] 2) Requirements for the surface coating of the cutting tool: Coating material: titanium aluminum silicon nitride (TiAlSiN), coating process: physical coating, coating thickness: 0.002mm~0.006mm.

[0079] 3) Tool geometry requirements: Rake angle 3°~10°, clearance angle 3°~15°, helix angle 35°~65°, and tip radius R. 粗 5.5mm~0.5mm, R 精 1mm~0.1mm, cutting edge Z is 3~8.

[0080] 4) The circular runout A after the tool assembly is ≤0.02mm.

[0081] 8. Optimize cutting process and parameters:

[0082] 1) Optimization of milling process:

[0083] a. External and internal shapes: Milling → semi-finish milling → finish milling.

[0084] b. Hole: Use rough boring → semi-finish boring → finish boring, and avoid cutting on the work-hardened layer during cutting.

[0085] 2) Selection of cutting parameters:

[0086] a. Since cutting speed directly affects tool life, both excessively low and excessively high cutting speeds will lead to faster tool wear. Therefore, a suitable cutting speed is V for rough milling. C =15~35m / min, fine milling V C =30~50m / min.

[0087] b. To avoid cutting on the work-hardened layer, the feed rate can be set to F for rough milling. 粗 =0.2~0.4mm / Z, finish milling F 精 =0.08~0.18mm / Z. Cutting depth per layer: 0.3mm~1.5mm.

[0088] 3) Tool cutting method: The tool cuts into the workpiece using a circular arc trajectory tangent. The circular arc trajectory is R = 8mm to 20mm to reduce cutting vibration.

[0089] 4) To reduce cutting hardening, reduce tool wear, extend tool life, ensure the dimensional stability of machined parts, and improve the surface quality of machined parts, climb milling is adopted.

[0090] 5) The application of a composite CNC program combination (macro program and ISO program combination) in machining, through the reasonable application and convenient adjustment of variable parameters, controls the milling stability of dimensional and thermal effects caused by the front-end manufacturing process of components, and plays a role in ensuring the stability of product manufacturing quality.

[0091] This embodiment describes the processing as follows: Figure 1 The part shown is a high-temperature alloy pipe interface component for the aerospace field, requiring thin-walled and ultra-thin-walled materials with high positional accuracy. The processing method of this invention can reduce the deformation during the processing of this series of thin-walled parts, and achieve effective control of various accuracies such as dimensional accuracy and surface quality.

[0092] The above embodiments are not intended to limit the scope of protection of the present invention. Any modifications, alterations or equivalent substitutions made based on the technical solutions of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A processing method for a high-precision thin-walled high-temperature alloy pipe interface, wherein the pipe interface (3), mounting plate (1), and interface housing (2) form a pipe interface assembly, the material of the pipe interface (3), mounting plate (1), and interface housing (2) is GH3625, the interface housing (2) is a variable cross-section, hollow thin-walled structure, the two ends of the interface housing (2) are respectively connected to the mounting plate (1) and the pipe interface (3), and the cross-section of the interface housing (2) gradually decreases from one end of the mounting plate (1) until it is welded to the pipe interface (3), the inner surface, outer surface, and inner hole of the pipe interface (3) are the processing positions, characterized in that: Processing methods include, Step 1: Install the pipe interface assembly. The clamping plate is welded to the pipe interface assembly. The clamping plate includes a base (7), a rib (6), a vertical plate (5), and a pressure plate (4). The vertical plate (5) is vertically connected to the base (7). The rib (6) is connected to both the base (7) and the vertical plate (5). The cross section of the rib (6) gradually increases from the end near the pipe interface (3) to the other end away from the pipe interface (3). A gap is formed between one side end face of the vertical plate (5) and the lower end face of the mounting plate (1). The rib (6) is welded along the circumferential contour of the mounting plate (1). The pressure plate (4) is pressed against the upper end face of the mounting plate (1). Then, it is connected to the machine tool table through the base (7). Step two, machining the pipe interface (3), including milling and boring, wherein, The milling objects are the inner and outer surfaces of the pipe interface (3). During milling, a combination of rough milling, semi-finish milling and finish milling is used. The boring object is the inner hole of the pipe interface (3). When boring, a combination of rough boring, semi-finish boring and finish boring is used.

2. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step one, the side end face area of ​​the upright plate (5) is larger than the lower end face area of ​​the mounting plate (1), and the side end face of the upright plate (5) and the lower end face of the mounting plate (1) are connected by spot welding, with the weld points arranged at equal intervals along the circumferential outline of the mounting plate (1).

3. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step one, the side end face accuracy of the vertical plate (5) is IT5~IT6, the roughness is 0.63~0.08μm, the flatness is 0.55~0.03mm, and the flatness error is M. 工 =0.55~0.03mm, the gap thickness C between the side end face of the upright plate (5) and the lower end face of the mounting plate (1) is 5~10mm.

4. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: Before step two, the gap between the side end face of the upright plate (5) and the lower end face of the mounting plate (1), the interface housing (2) and the cavity of the pipe interface (3) are filled with materials that have supporting and vibration-absorbing functions.

5. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step two, the rough milling speed V C =15~35m / min, finish milling speed V C =30~50m / min, rough milling feed rate F 粗 =0.2~0.4mm / Z, finish milling feed rate F 精 =0.08~0.18mm / Z, and the depth of cut for each layer during layer milling is 0.3~1.5mm. During milling, the tangential entry of the circular arc trajectory is adopted, and the circular arc trajectory of the entry is R=8~20mm.

6. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step two, the milling and boring tools are made of ultrafine particle cemented carbide rods. The main elements in the rods are 87% tungsten and 12% cobalt by mass, and the diameter of the powder particles in the rods is ≤0.005mm, and the hardness is HV≥1600.

7. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step two, the surfaces of the milling and boring tools are coated with a titanium aluminum nitride silicon coating, and the coating thickness is 0.002 mm to 0.005 mm.

8. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step two, the tool clamping for milling and boring operations satisfies the condition that the tool extension length δ is less than 7 times the minimum tool diameter D. 刀 The circular runout η of the tool assembly is ≤0.01 mm.

9. The processing method for high-precision thin-walled high-temperature alloy material pipe interfaces according to claim 1, characterized in that: In step two, the design and manufacture of milling and boring machine tools conform to ISO international standards. The repeatability of the X / Y / A / C axis positioning accuracy is ≤ 1 / 3 to 1 / 5 of the dimensional accuracy of the machined elements of the part. The machine tool position accuracy acceptance standard adopts VDI / 3441. The machine tool geometric accuracy is performed in accordance with the general rules for metal cutting machine tools JB2670-82 and ISO230-1-96. Before starting the machine tool for machining, it is pre-run for 0.3 to 0.5 hours. The spindle speed is S300 to S2000 rpm, the feed rate is F300 to F2000 mm / min, the machining stroke X / Y / Z = Xmax / Ymax / Z100 to 300, the machine tool spindle rotation accuracy L ≤ 0.006 mm, the machining datum coincides with the programming datum, and the X and Y coincidence error ε ≤ 0.01 mm.

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