CN115709369A - Method for processing high-precision thin-wall high-temperature alloy material pipe interface - Google Patents

Abstract

The invention discloses a processing method of a high-precision thin-wall high-temperature alloy material pipe interface, which comprises the following steps of clamping a pipe interface assembly, and welding the pipe interface assembly with the clamping plate by adopting a welding way, wherein the clamping plate comprises a base, a rib plate, a vertical plate and a pressing plate, a gap is formed between one side end surface of the vertical plate and the lower end surface of the mounting plate, then the welding is carried out at intervals along the circumferential outline of the mounting plate, the pressing plate is tightly pressed on the upper end surface of the mounting plate, and then the pressing plate is connected with a machine tool workbench through the base; milling and boring the pipe joint, wherein milling objects are an inner profile and an outer profile of the pipe joint, and a combination mode of rough milling, semi-finish milling and finish milling is adopted during milling; the boring object is an inner hole of the pipe joint, and a combination mode of rough boring, semi-fine boring and fine boring is adopted during boring. The invention effectively reduces the deformation of the thin-wall part in the machining process, achieves the effective control of machining size, improves the machining qualified rate and reduces the consumption of cutters.

Description

Method for processing high-precision thin-wall high-temperature alloy material pipe interface

Technical Field

The invention belongs to the technical field of aerospace machining, and particularly relates to a machining method of a high-precision thin-wall high-temperature alloy material pipe interface.

Background

As shown in figure 1, the high-precision thin-wall high-temperature alloy material pipe interface component for the aviation radiator system is characterized in that the shape is irregular, the size of a pipe nozzle is large, the distance between the pipe nozzle interface and a welding line is short, the component structurally belongs to a thin-wall part, stress exists in a welded assembly, deformation is easy to generate after stress release, size precision change is large, machining deformation and cutter vibration are easy to generate in the machining process of the thin-wall part, so that the ensuring difficulty of size and surface quality is increased, the final result is that the production yield is extremely low (the yield is less than 50%), and the consumption of a cutting cutter is large.

Specifically, the pipe joint component is made of GH3625, belongs to solid solution strengthening nickel-based high-temperature alloy, and has the following difficulties in milling the component made of the material:

1.GH3625 has good plasticity and high strength, and still has higher strength at high temperature.

2. The cutting force is large during cutting, the cutting hardening is serious, and the cutting work is consumed in the cutting process of the equipment.

3.gh3625, since the cutting temperature of the cutting portion (around the cutting edge of the tool) of the tool is high due to the difference in thermal conductivity, the cutting tool is more likely to suffer from adhesive wear and diffusion wear at high temperature, and the cutting edge is likely to be cracked finely, which eventually leads to chipping.

4.GH3625 has large bonding tendency in the cutting process of the cutter, is easy to generate accumulated cutting burls, has high cutting temperature and serious cutter sticking phenomenon, and the cutting edge of the cutter is easy to wear.

5.GH3625 the vibration of the cutter is remarkable in the processing process.

On the other hand, from the structural point of view of the components, the processing difficulty is expressed in the following aspects:

1. the component structure belongs to a hollow thin-wall series, the milling part of the pipe joint is far away from the fixable clamping position, and the workpiece is difficult to realize rigid support in positioning and clamping.

2. The requirements on the size and shape precision of the processing elements of the pipe joint of the component are high, and the wall of the part is thin and hollow, so that the cutting vibration is severe, and the quality of the processed surface is poor.

3. The component structure is a welded assembly, the distance between a pipe joint (a finish machining part) and a weld joint is short, the action stress of heat influence change exists, deformation is easy to generate after the stress is released, the size change is large, the cutting force is not stable due to heat influence, and the machining vibration cutter is remarkable.

For the reasons mentioned above, it is necessary to take a series of targeted measures during the machining process.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a method for processing a high-precision thin-wall high-temperature alloy material pipe joint, which effectively reduces the deformation of a thin-wall part in the processing process, achieves the effective control of machining size, improves the processing qualified rate and reduces the consumption of a cutter.

The invention is realized by the following technical scheme:

the processing method of the high-precision thin-wall high-temperature alloy material pipe interface comprises the steps that the pipe interface, an installation plate and an interface shell form a pipe interface assembly, the pipe interface, the installation plate and the interface shell are made of GH3625, the interface shell is of a variable cross section and hollow thin-wall structure, two ends of the interface shell are respectively connected with the installation plate and the pipe interface, the cross section of the interface shell is gradually reduced from one end of the installation plate until the interface shell is welded with the pipe interface, an inner molded surface, an outer molded surface and an inner hole of the pipe interface are positions to be processed, the processing method comprises the following steps,

step one, clamping a pipe joint assembly, and welding the pipe joint assembly with a clamping plate, wherein the clamping plate comprises a base, a rib plate, a vertical plate and a pressing plate, the vertical plate is vertically connected to the base, the rib plate is simultaneously connected with the base and the vertical plate, the cross section of the rib plate is gradually increased from one end close to the pipe joint to the other end far away from the pipe joint, a gap is formed between one side end face of the vertical plate and the lower end face of the mounting plate and then welded at intervals along the circumferential profile of the mounting plate, and the pressing plate is tightly pressed on the upper end face of the mounting plate and then connected with a machine tool workbench through the base;

step two, processing the pipe joint, including milling and boring, wherein,

milling objects are an inner profile and an outer profile of a pipe joint, and a combination mode of rough milling, semi-finish milling and finish milling is adopted during milling;

the boring object is an inner hole of the pipe joint, and a combination mode of rough boring, semi-fine boring and fine boring is adopted during boring.

Further, in the first step, the area of the side end face of the vertical plate is larger than the area of the lower end face of the mounting plate, the side end face of the vertical plate is connected with the lower end face of the mounting plate in a spot welding mode, and welding spots are arranged at equal intervals along the circumferential contour line of the mounting plate.

Further, in the first step, the side end face precision of the vertical plate is IT 5-IT 6, the roughness is 0.63-0.08 μm, the planeness is 0.55-0.03 mm, and the planeness error M is _{Worker's tool} And =0.55 to 0.03mm, and the thickness of the gap between the side end surface of the vertical plate and the lower end surface of the mounting plate is 5 to 10mm.

Further, before the second step, filling materials with a supporting function and a vibration absorbing function into a gap between the side end face of the vertical plate and the lower end face of the mounting plate, the interface shell and the pipe interface cavity.

Further, in the second step, the rough milling speed V _C = 15-35 m/min, fine milling speed V _C = 30-50 m/min, rough milling feed F _Coarse = 0.2-0.4 mm/Z, fine milling feed F _{Extract of Chinese medicinal materials} And the cutting depth of each layer is 0.3-1.5 mm during layered milling, and the circular arc track is tangentially cut during milling, wherein the cutting circular arc track is R = 8-20 mm.

Further, in the second step, the milling and boring tool material is a superfine particle hard alloy material bar, and the mass percentage of main elements in the bar is as follows: 87 percent of tungsten and 12 percent of cobalt, wherein the diameter of powder particles in the bar is less than or equal to 0.005mm, and the hardness HV is more than or equal to 1600.

Furthermore, in the second step, a coating is formed on the surface of the cutter subjected to milling and boring, the coating is titanium aluminum silicon nitride, and the thickness of the coating is 0.002 mm-0.005 mm.

Further, in the second step, the geometrical parameters of the milling and boring tool meet the following requirements: the front angle of the cutter is 3-10 degrees, the rear angle of the cutter is 3-15 degrees, the helix angle is 35-65 degrees, and the round angle of the cutter point is R _Coarse ＝5.5mm～0.5mm，R _{Extract of Chinese medicinal materials} And (5) =1mm to 0.1mm, and the cutting edge is Z =3 to 8.

Further, in the second step, the milling and boring tool is clamped so that the tool extension delta is less than 7 times of the minimum diameter D of the tool _{Knife with cutting edge} The circular runout eta of the cutter assembly is less than or equal to 0.01mm.

Further, in the second step, the design and manufacture of the milling and boring machine tool meet ISO international standards, the positioning precision of the X/Y/A/C axis of the repeated positioning precision is less than or equal to 1/3-1/5 of the dimensional precision of the element to be processed of the part, the checking and accepting standard of the position precision of the machine tool adopts VDI/3441, the geometric precision of the machine tool is executed according to JB2670-82 and ISO230-1-96 of the general rule of a metal cutting machine tool, the machine tool is pre-operated for 0.3-0.5 hour before starting up and processing, the rotating speed of the main shaft is S300-S2000 rpm, the feeding amount is F300-F2000 mm/min, the processing stroke is X/Y/Z = X max/Y max/Z100-300, the rotating precision L of the main shaft of the machine tool is less than or equal to 0.006mm, the processing standard is coincident with the programming standard, and the coincidence degree error epsilon of X, Y is less than or equal to 0.01mm.

The processing method solves the technical problem of poor quality stability of high-precision, thin-wall and special-shaped high-temperature alloy material pipe interface components in a radiator system product, reduces the deformation of thin-wall parts in the processing process by optimizing processing steps, reasonably designing tool positioning requirements, optimizing and selecting geometrical parameters of a cutter, optimizing processing cutting parameters and allowance and other measures, and achieves effective control of machining size.

The processing method of the invention has the following characteristics:

(1) Aiming at the material and structural characteristics of the pipe joint components, the machining steps are optimized by adopting the steps of roughly milling an outer profile, an inner profile → semi-finely milling the outer profile, the inner profile → finely milling the outer profile and the inner profile, and then roughly boring, semi-finely boring and finely boring an inner hole;

(2) The mounting plate of the pipe joint component is selected as a clamping plane for connection, and the clamping rigidity and strength of the pipe joint component are improved in a welding mode;

(3) According to the characteristics of acting force (tension and pressure are alternated) of the pipe joint on the mounting plate during milling and boring processing, a rib plate is designed on one side of a vertical plate of a clamping plate serving as a tool clamp, so that the mounting plate and the vertical plate serving as a reference plane always keep no deformation or small deformation;

(4) In order to reduce the deformation tendency of the pipe joint, the axis of the pipe joint is placed in the vertical direction to be the best processing position (in a vertical milling mode), but due to the structural characteristics of the pipe joint component, the gravity center position of the pipe joint component deviates to the pipe joint, the gravity center position of the pipe joint component is higher after the pipe joint component is connected with a machine tool workbench, and bending deformation caused by cutting action moment is easy to occur;

(5) A space is reserved between the vertical plate and the mounting plate, on one hand, a deformation and correction space is reserved for welding, and on the other hand, a part of vibration reduction material is filled in the space to reduce the transmission of vibration between the vertical plate and the mounting plate;

(6) Aiming at the material characteristics of GH3625, titanium aluminum silicon nitrogen (TiAlSiN) is selected as a coating material of the cutting tool, and the components, the particle diameter, the geometric parameters, the runout value after the cutting tool is combined and the like of the cutting tool are optimally selected;

(7) Aiming at the characteristics of a pipe joint component such as a hollow thin wall, a short distance from a welding seam, welding thermal stress and the like, the feeding amount, the feeding direction and the cutting track in the milling process are optimized, and meanwhile, a macro program and an ISO program combined application mode is adopted in the machining process.

Compared with the prior art, the method for processing the pipe interface component improves the quality stability of the high-precision thin-wall high-temperature alloy material pipe interface part of the aviation radiator system, ensures the product quality, the performance and the design requirement, and lays a foundation for the high-precision cutting processing method of the thin-wall structural system component of the difficult-to-process material and the improvement of the process parameters.

Drawings

FIG. 1 is a schematic view of the components of a high-precision thin-walled superalloy material pipe interface;

FIG. 2 is a schematic view of a state that a high-precision thin-wall high-temperature alloy material pipe interface is clamped on a clamp;

in the figure: 1-mounting a plate; 2-an interface housing; 3-pipe interface; 4, pressing a plate; 5, erecting a plate; 6-ribbed plate; 7- -base.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.

The difficulty of the part processing is analyzed:

1. according to the attached figure 1, the part structure belongs to a typical thin-wall part and is very easy to deform in the processes of clamping and machining.

1) The structural shape of the component is irregular, the size of the nozzle is large, and the distance between the nozzle interface and the welding line is short.

2) The assembly part welded by the thin-wall part with the component structure has stress, is easy to deform after the stress is released, and has large change of the size and the shape precision.

3) The component structure belongs to a hollow thin-wall series, the milling position of the pipe joint is far away from the position where the pipe joint can be fixed and clamped, and the part is difficult to realize rigid support in positioning and clamping.

4) The requirements on the size and shape precision of the processing elements of the pipe joint of the component are high, and the component is a thin-wall hollow mechanism, so that the vibration is severe in the cutting process, and the quality of the processed surface is difficult to guarantee.

2. Materials of the components:

the component material is GH3625, belongs to solid solution strengthening nickel-based high-temperature alloy, and has the difficulty in milling the component material, and the GH3625 material has the characteristics that:

1) The GH3625 material has good plasticity and high strength, and still has higher strength at high temperature. The resistance to plastic deformation is large during cutting, the cutting part of the cutter bears large cutting load, and the cutting temperature is extremely high.

2) The GH3625 material has large cutting force (the cutting force is 50% higher than that of 45# steel) during cutting, and has serious cutting hardening (the cutting surface hardening is 2-5 times of that of a parent material), the thickness of a surface hardening layer is about 0.08-0.14 mm, and the cutting work is consumed in the equipment cutting process.

3) The difference of the heat conductivity coefficient of the GH3625 material is 1/5-1/2 of that of 45# steel. Therefore, the cutting temperature of the cutting portion (around the cutting edge of the tool) of the tool is high, and the cutting tool is more likely to be subjected to adhesive wear and diffusion wear at high temperature, and the cutting edge is more likely to be cracked finely, and finally, chipping is caused.

4) The solid solution strengthened nickel-based high-temperature alloy material has large bonding tendency in the cutting process of the cutter, is easy to generate accumulated cutting edges, has high cutting temperature and serious cutter sticking phenomenon, and the cutting edge of the cutter is easy to wear. Thereby affecting the sharpness of the cutting tool and the quality of the surface being machined.

In order to achieve high-quality machining, the invention is improved and adapted from the following aspects:

1. selection and application of processing equipment:

1) Machining a central machine tool: the machine tool is designed and manufactured according to ISO international standards, the repeated positioning precision meets the requirement that the X/Y/A/C axis positioning precision is less than or equal to the size precision of a machined element of a part/3-5, (VDI/DGQ 3441-ISO 230-2 norm), and the machine tool position precision acceptance standard adopts VDI/3441. The geometric accuracy of the machine tool is implemented according to the JB2670-82 (ISO 230-1-96) of the general rule of metal cutting machine tools.

2) Before starting up the machine tool of the machining center, pre-running for 0.3-0.5 hours, rotating speed of a main shaft S300-S2000 rpm, feeding amount F300-F2000 mm/min, and stroke X/Y/Z = Xmax/Ymax/Z100-300 of the machine tool.

3) Correcting the precision of a machine tool spindle: and measuring the rotation precision L of the main shaft of the machine tool by using a dial indicator to be less than or equal to 0.006mm.

2. Processing reference and programming reference setting:

the processing standard is superposed with the programming standard, and the error epsilon of the superposition degree of X, Y is less than or equal to 0.01mm.

3. Reasonably clamping the cutter;

1) When clamping a tool, the tool extension (delta) should be less than 7 times the tool minimum diameter (D) _{Knife with cutting edge} ): delta is less than or equal to 7D _{Knife with cutting edge} 。

2) When clamping the cutter, the circular runout (eta) of the cutter assembly is controlled well, and the circular runout eta of the cutter assembly is less than or equal to 0.01mm.

4. Improve the structural rigidity in the course of working of the spare part:

the clamping plate comprises a base 7, a rib plate 6, a vertical plate 5 and a pressing plate 4, wherein the vertical plate 5 is vertically connected to the base 7, the rib plate 6 is simultaneously connected with the base 7 and the vertical plate 5, the section of the rib plate 6 is gradually increased from one end close to the pipe joint 3 to the other end far away from the pipe joint 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 then welded at intervals along the circumferential contour of the mounting plate 1, and the pressing plate 4 is tightly pressed on the upper end face of the mounting plate 1 and then connected with a machine tool workbench through the base 7.

1) The clamping plate is selected: the clamping plate is made of 45# steel material, the thickness delta is more than or equal to 8mm, the size of the clamping plate is increased by more than or equal to 350 multiplied by 230, and the flatness of a clamping plane is 0.55 mm-0.03 mm.

2) The clamping plate is connected with the components in a welding mode, the welding point issuing distance L = 20-100 mm, the welding point is firm, and the gap C = 5-10 mm between the components and the clamping plate.

5. Selecting a clamping plate positioning surface:

the positioning surface of the clamping plate is provided with a plane or a curved surface, and the plane (the vertical plate 5) is selected as the positioning surface in the invention, so that the cleanness of the positioning surface is ensured.

1) The precision of the positioning surface of the clamping plate is IT 5-IT 6, and the roughness is 0.63-0.08 um.

2) Flatness error (mu) of locating surface of clamping plate _{Worker's tool} )Μ _{Worker's tool} ＝0.55～0.03mm。

6. The cavity of the clamping plate and the component can be filled with proper amount of cavity filling supports or other shock-absorbing cavity fillers to reduce cutting vibration, and the filling position is as close to the cutting processing position as possible in the cavity of the clamping plate and the component.

7. The cutting performance of the cutter is improved:

designing and customizing a special cutter according to the cutting performance of the high-temperature alloy material, the structural characteristics of the components and the technical requirements of the process. The cutter is required to keep the cutting edge sharp, the shock resistance and the cutting stability under a better high-temperature environment in the machining and cutting process. In particular, rough machining has strong bearing impact resistance, high temperature resistance, good knife tip dispersibility, good heat insulation performance and high rigidity of a knife coating, and fine machining has good machinability, wear resistance and cutting size stability.

1) The requirements of the cutter material are as follows: adopting an ultrafine particle hard alloy material bar, wherein the content (mass percent) is as follows: 87 percent of tungsten and 12 percent of cobalt, the diameter of the powder particles is less than or equal to 0.005mm, and the hardness HV is more than or equal to 1600.

2) The requirements of the surface roughness layer of the cutter are as follows: the coating material is titanium aluminum silicon nitrogen (TiAlSiN), and the coating process comprises the following steps: physical plating, plating thickness: 0.002 mm-0.006 mm.

3) The geometrical parameter requirements of the cutter are as follows: the front angle of the cutter is 3-10 degrees, the rear angle of the cutter is 3-15 degrees, the helical angle is 35-65 degrees, and the round corner of the cutter point is R _Coarse 5.5mm～0.5mm、R _{Extract of Chinese medicinal materials} 1 mm-0.1 mm, and the cutting edge Z is 3-8.

4) The circle run-out A after the cutter combination is less than or equal to 0.02mm.

8. Optimizing cutting process and parameters:

1) Optimizing the milling process:

a. exterior and interior types: milling → semi-finish milling → finish milling is adopted.

b. Hole: by adopting the rough boring → the semi-fine boring → the fine boring, the cutting on the machining hardening layer is avoided during the cutting.

2) Cutting parameter selection:

a. since cutting speed directly affects tool life, too low or too high a cutting speed can cause the tool to wear faster. Therefore, the cutting speed is favorable, rough milling V _C Finish milling V of 15-35 m/min _C ＝30～50m/min。

b. For avoiding cutting in the work-hardened layer, the feed is advisable, rough milling F _Coarse Finish milling F = 0.2-0.4 mm/Z _{Extract of Chinese medicinal materials} And (h) = 0.08-0.18 mm/Z. Cutting each layer deeply: 0.3 mm-1.5 mm.

3) The way the tool cuts into the material: cutting into the workpiece by the tangent of the arc track, and taking out the cut arc track: r =8 mm-20 mm, and reduces the cutting vibration.

4) In order to reduce cutting hardening, reduce cutter abrasion, prolong the service life of the cutter, ensure the dimensional stability of a processed part and improve the quality of a processed surface, the forward milling is adopted.

5) The numerical control program combination (macro program and ISO program combination) with a composite structure is used for application and processing, the milling stability of size and thermal influence change brought in the front end manufacturing process of the component is controlled through reasonable application of variable parameters and convenience in adjustment, and the stability of product manufacturing quality is guaranteed.

The embodiment is used for processing the parts shown in figure 1, the parts are high-temperature alloy material pipe joint components with high position precision requirements of thin walls and ultrathin walls in the aerospace field, and the processing method can reduce the deformation of the series of thin-wall parts in the processing process and achieve the effective control of various precisions such as dimensional precision, surface quality and the like.

The above embodiments are not intended to limit the scope of the present invention, and any variations, modifications, or equivalent substitutions made on the technical solutions of the present invention should fall within the scope of the present invention.

Claims (10)

1. The processing method of the high-precision thin-wall high-temperature alloy material pipe interface comprises the following steps that a pipe interface assembly is formed by the pipe interface (3), the mounting plate (1) and the interface shell (2), the pipe interface (3), the mounting plate (1) and the interface shell (2) are made of GH3625, the interface shell (2) is of a variable cross section and hollow thin-wall structure, two ends of the interface shell (2) are respectively connected with the mounting plate (1) and the pipe interface (3), the cross section of the interface shell (2) is gradually reduced by one end of the mounting plate (1) until the interface is welded with the pipe interface (3), and an inner profile, an outer profile and an inner hole of the pipe interface (3) are positions to be processed, and the processing method is characterized in that: the processing method comprises the following steps of,

the method comprises the following steps that firstly, a pipe joint assembly is clamped and welded with the pipe joint assembly through a clamping plate, wherein the clamping plate comprises a base (7), a rib plate (6), a vertical plate (5) and a pressing plate (4), the vertical plate (5) is vertically connected onto the base (7), the rib plate (6) is simultaneously connected with the base (7) and the vertical plate (5), the section of the rib plate (6) is gradually increased from one end close to the pipe joint (3) to the other end far away from the pipe joint (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 then welded at intervals along the circumferential outline of the mounting plate (1), and the pressing plate (4) is tightly pressed on the upper end face of the mounting plate (1) and then connected with a machine tool workbench through the base (7);

step two, processing the pipe joint (3) comprising milling and boring, wherein,

the milling objects are an inner profile and an outer profile of the pipe joint (3), and a combination mode of rough milling, semi-finish milling and finish milling is adopted during milling;

the boring object is an inner hole of the pipe joint (3), and a combination mode of rough boring, semi-fine boring and fine boring is adopted during boring.

2. The method for processing the high-precision thin-wall high-temperature alloy material pipe interface as claimed in claim 1, wherein the method comprises the following steps: in the first step, the area of the side end face of the vertical plate (5) is larger than that of the lower end face of the mounting plate (1), the side end face of the vertical plate (5) is connected with the lower end face of the mounting plate (1) in a spot welding mode, and welding spots are arranged at equal intervals along the circumferential contour line of the mounting plate (1).

3. The method for processing the high-precision thin-wall high-temperature alloy material pipe joint according to claim 1, wherein the method comprises the following steps: in the first step, the side end face precision of the vertical plate (5) is IT 5-IT 6, the roughness is 0.63-0.08 mu m, the planeness is 0.55-0.03 mm, and the planeness error M is _{Worker's tool} And =0.55 to 0.03mm, and the thickness of the gap between the side end surface of the vertical plate (5) and the lower end surface of the mounting plate (1) is 5 to 10mm.

4. The method for processing the high-precision thin-wall high-temperature alloy material pipe joint according to claim 1, wherein the method comprises the following steps: before the second step, filling materials with a supporting function and a vibration absorbing function into a gap between the side end face of the vertical plate (5) and the lower end face of the mounting plate (1), the interface shell (2) and the cavity of the pipe interface (3).

5. The method for processing the high-precision thin-wall high-temperature alloy material pipe joint according to claim 1, wherein the method comprises the following steps: in the second step, the rough milling speed V _C = 15-35 m/min, fine milling speed V _C = 30-50 m/min, rough milling feed F _Coarse = 0.2-0.4 mm/Z, fine milling feed F _{Extract of Chinese medicinal materials} = 0.08-0.18 mm/Z, and cutting depth of each layer during layered milling0.3-1.5 mm, and cutting in by adopting a circular arc track tangent line during milling, wherein the cutting-in circular arc track is R = 8-20 mm.

6. The method for processing the high-precision thin-wall high-temperature alloy material pipe interface as claimed in claim 1, wherein the method comprises the following steps: in the second step, the milling and boring cutter material adopts an ultrafine particle hard alloy material bar, and the mass percentage of main elements in the bar is as follows: 87 percent of tungsten and 12 percent of cobalt, wherein the diameter of powder particles in the bar is less than or equal to 0.005mm, and the hardness HV is more than or equal to 1600.

7. The method for processing the high-precision thin-wall high-temperature alloy material pipe joint according to claim 1, wherein the method comprises the following steps: in the second step, a coating is arranged on the surface of the cutter subjected to milling and boring, the coating is titanium aluminum silicon nitride, and the thickness of the coating is 0.002-0.005 mm.

8. The method for processing the high-precision thin-wall high-temperature alloy material pipe interface as claimed in claim 1, wherein the method comprises the following steps: in the second step, the geometrical parameters of the milling and boring tool meet the following requirements: the front angle of the cutter is 3-10 degrees, the rear angle of the cutter is 3-15 degrees, the helix angle is 35-65 degrees, and the round angle of the cutter point is R _Coarse ＝5.5mm～0.5mm，R _{Extract (Chinese character of 'Jing')} =1mm to 0.1mm, and the cutting edge is set to Z =3 to 8.

9. The method for processing the high-precision thin-wall high-temperature alloy material pipe joint according to claim 1, wherein the method comprises the following steps: in the second step, the milling and boring cutter is clamped to ensure that the extension length delta of the cutter is less than 7 times of the minimum diameter D of the cutter _{Knife with cutting edge} The circular runout eta of the cutter assembly is less than or equal to 0.01mm.

10. The method for processing the high-precision thin-wall high-temperature alloy material pipe interface as claimed in claim 1, wherein the method comprises the following steps: in the second step, the design and manufacture of the milling and boring machine tool meet ISO international standards, the positioning precision of a repeated positioning precision X/Y/A/C shaft is less than or equal to 1/3-1/5 of the dimensional precision of a machined element of the part, the position precision acceptance standard of the machine tool adopts VDI/3441, the geometric precision of the machine tool is executed according to JB2670-82 and ISO230-1-96 of the conduction rule of a metal cutting machine tool, the machine tool is pre-operated for 0.3-0.5 hour before starting machining, the rotating speed of a main shaft is S300-S2000 rpm, the feeding amount is F300-F2000 mm/min, the machining stroke X/Y/Z = XMax/YMax/Z100-300, the rotating precision L of the main shaft of the machine tool is less than or equal to 0.006mm, the machining standard is coincident with the programming standard, and the coincidence degree error of X, Y is less than or equal to 0.01mm.

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