Machining method for thin-wall hollow precipitation hardening type stainless steel structural part

Abstract

The invention discloses a thin-wall hollow precipitation hardening type stainless steel structural part machining method and belongs to the technical field of machining. According to the machining method, the thin-wall hollow precipitation hardening type stainless steel structural part is machined and formed at a time through the machining method for the thin-wall hollow precipitation hardening type stainless steel structural part, and a reserved process flange is machined on the top side of a top ring cylinder of the thin-wall hollow precipitation hardening type stainless steel structural part. The invention aims to solve the problems of large material removal amount, complex part structure and high size and position matching precision requirement in the existing stainless steel structural part processing method, and the problems of high possibility of deformation and inaccurate size of the stainless steel structural part in the processing process. The rapid clamping and positioning tool is used for clamping in the subsequent process, the allowance is continuously and evenly removed, deformation of the thin-wall hollow precipitation hardening type stainless steel structural part caused by final allowance removal is avoided, the machining efficiency can be greatly improved, and the machining quality and efficiency are improved through the rapid clamping and positioning tool.

Description

Technical Field

[0001] The invention relates to a method for processing a thin-wall hollow precipitation hardening stainless steel structural part, belonging to the technical field of mechanical processing. Background Art

[0002] Thin-walled hollow stainless steel structural parts are widely used in aerospace, automobile, shipbuilding and other fields. In the aerospace field, thin-walled complex structural parts have common characteristics such as weak rigidity and similar shape and structure. The rigidity of these parts changes during cutting as a large amount of blank material is removed.

[0003] The existing processing methods for thin-walled hollow precipitation-hardened stainless steel structural parts have many processing difficulties, such as large material removal, complex part structure, and high requirements for dimensional position accuracy. They are very easy to deform and the dimensions are not accurate enough during the processing, so that the processed stainless steel structural parts do not meet the design requirements, affect their use, and even become scrapped.

[0004] Therefore, it is urgent to propose a new thin-walled hollow precipitation hardened stainless steel structural parts processing method to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of large material removal, complex part structure, high precision of size and position matching in the existing stainless steel structural parts processing methods, as well as the problems of stainless steel structural parts being easily deformed and not being precise in size during processing. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention:

[0007] A method for processing a thin-walled hollow precipitation-hardened stainless steel structural part, the thin-walled hollow precipitation-hardened stainless steel structural part comprises a flange bottom ring, an outer hollow connecting wall, an inner hollow connecting wall, a top ring tube and an inner ring tube, the top of the outer hollow connecting wall is connected to the top ring tube, the bottom of the outer hollow connecting wall is connected to the flange bottom ring, the top of the inner hollow connecting wall is connected to the inner ring tube, and the bottom of the inner hollow connecting wall is connected to the flange bottom ring, the outer hollow connecting wall comprises a plurality of outer hollow connecting parts arranged in a uniform circumferential array, the inner hollow connecting wall comprises a plurality of inner hollow connecting parts arranged in a uniform circumferential array, the outer hollow connecting parts and the inner hollow connecting parts are alternately arranged on the same circumference, the flange bottom ring, the outer hollow connecting wall, the inner hollow connecting wall, the top ring tube and the inner ring tube are formed at one time by a method for processing a thin-walled hollow precipitation-hardened stainless steel structural part, the top side of the top ring tube is processed with a reserved process flange, and the method for processing a thin-walled hollow precipitation-hardened stainless steel structural part specifically comprises the following steps:

[0008] Step 1, prepare the raw materials for processing, rough turn the outer circle, inner hole and overall height, and then perform ultrasonic flaw detection;

[0009] Step 2, rough-machine the flange bottom ring, the outer circle of the outer hollow connecting wall and the top ring tube, the inner hole of the inner hollow connecting wall and the top ring tube, the bottom end face of the flange bottom ring and the reserved process flange according to the outline of the thin-walled hollow precipitation hardened stainless steel structural part;

[0010] Step 3, rough milling the large end deep groove, that is, the large end deep groove is the gap between the outer hollow connecting wall and the inner hollow connecting wall;

[0011] Step 4: Heat treatment to eliminate stress, with the bottom end of the flange bottom ring facing downward, in an environment of 410℃±10℃, keep warm for 135min±10min, and air cool;

[0012] Step 5, the top surface of the reserved process flange is processed as the reference surface, and the flatness of the reference surface is ensured to be 0.03;

[0013] Step 6, place the reference surface described in step 5 on the lathe chuck as the bottom surface, fix it with a small pressure plate, align the outer circle of the reference surface, semi-finish turning the bottom end surface of the flange bottom ring, the inner hollow connecting wall and the inner hole of the top ring tube, and the large end deep groove, ensuring that the flatness of the bottom end surface of the flange bottom ring is 0.03, the parallelism of the thickness surface is 0.05, and the single-side allowance is 0.5.

[0014] Step 7, semi-finishing milling of the large end deep groove;

[0015] Step 8, place the bottom end face of the flange bottom ring on the lathe chuck, fix it with a small pressing plate, find the outer circle of the bottom end face of the flange bottom ring, semi-finish turning the outer circle of the top surface of the reserved process flange, the inner hole of the inner hollow connecting wall and the top ring tube, and the large end deep groove, with a single-side allowance of 0.5mm;

[0016] Step 9: Use three equal-height washers to support the bottom end face of the flange bottom ring, use three pressure plates to evenly press on the top face of the reserved process flange, align the outer circle of the bottom end face of the flange bottom ring, and the circle runout range is within 0.005. Process the locating pin hole to ensure that the position accuracy of the locating pin hole is 0.025, and the single-side allowance of the locating pin hole is 0.5;

[0017] Step 10, five-axis precision milling of the hollow groove in the middle of the part, using a quick clamping positioning tool, with the bottom end of the flange bottom ring facing downward, using a positioning pin, and using the positioning pin hole to determine the angle, three-axis vertical milling of the outer hollow connection wall outer circular end face 18 large hollow grooves, the large hollow groove is the gap between two adjacent outer hollow connection parts;

[0018] Then, the five-axis swing angle precision milling is performed on the small hollow groove 36 at the outer circular side wall of the outer hollow connection wall, and the small hollow groove is the gap between two adjacent inner hollow connection parts;

[0019] Step 11, with the bottom end face of the flange bottom ring facing upward, align the outer circle of the bottom end face of the flange bottom ring, use a locating pin to determine the angle through the locating pin hole, and fine mill the large end deep groove;

[0020] Step 12, fine turning the bottom end face of the flange bottom ring, the outer hollow connecting wall and the outer circle of the top ring tube, turning around and taking the bottom end face of the flange bottom ring as the reference, machining to remove the reserved process flange, and fine turning the end face, outer circle and inner hole of the top ring tube;

[0021] Step 13, with the bottom end face of the flange bottom ring facing upward, align the outer circle of the bottom end face of the flange bottom ring, use a locating pin to determine the angle through the locating pin hole, and process the locating pin hole to ensure that the diameter Φ of the locating pin hole is 60~+0.015 and the position accuracy is 0.025, and complete the processing of the thin-walled hollow precipitation hardened stainless steel structural part.

[0022] Preferably: a plurality of positioning pin holes are processed on the flange bottom ring, and when using a quick clamping positioning tool, the positioning pins are used to determine the angle in the positioning pin holes, and the positioning pins are arranged in the positioning pin holes and fixedly connected with the quick clamping positioning tool.

[0023] The present invention has the following beneficial effects:

[0024] 1. The present invention can greatly improve the processing efficiency of thin-walled hollow precipitation hardened stainless steel structural parts, ensure product quality and processing stability, and use quick clamping and positioning tooling to further improve processing quality and efficiency;

[0025] 2. The present invention reserves a process flange for subsequent process clamping by design, and continuously and evenly removes the excess, thereby avoiding deformation of the thin-walled hollow precipitation hardened stainless steel structural parts caused by the final removal of the excess;

[0026] 3. The present invention performs heat treatment after rough machining to eliminate stress to the greatest extent, control the subsequent machining deformation of thin-walled hollow precipitation hardened stainless steel structural parts, and repeatedly remove the excess through rough and semi-finishing, and select suitable tools and processing parameters to cut parts, gradually release stress, reduce part clamping and machining deformation, and ensure that the final finishing size is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional diagram of the thin-walled hollow precipitation hardened stainless steel structural member of the present invention;

[0028] Figure 2 is a cross-sectional view of the thin-walled hollow precipitation hardened stainless steel structural member of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the thin-walled hollow precipitation hardened stainless steel structural member of the present invention;

[0030] Figure 4 This is a diagram of the coordinated installation of the thin-walled hollow precipitation hardened stainless steel structural member and the quick clamping and positioning tooling described in the present invention.

[0031] In the figure: 1-flange bottom ring, 2-external hollow connecting wall, 3-inner hollow connecting wall, 4-top ring tube, 5-inner ring tube, 6-quick clamping positioning tooling, 7-locating pin, 8-locating pin, 21-external hollow connecting part, 31-inner hollow connecting part, 41-reserved process flange. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0033] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: a fixed connection is selected as a welding connection, and a detachable connection is selected as a hinge connection.

[0034] Specific implementation method 1: Combination Figure 1-Figure 4 The present embodiment is described. The present embodiment is a method for processing a thin-walled hollow precipitation hardened stainless steel structural part. The thin-walled hollow precipitation hardened stainless steel structural part comprises a flange bottom ring 1, an outer hollow connecting wall 2, an inner hollow connecting wall 3, a top ring tube 4 and an inner ring tube 5. The top of the outer hollow connecting wall 2 is connected to the top ring tube 4, the bottom of the outer hollow connecting wall 2 is connected to the flange bottom ring 1, the top of the inner hollow connecting wall 3 is connected to the inner ring tube 5, and the bottom of the inner hollow connecting wall 3 is connected to the flange bottom ring 1. The outer hollow connecting wall 2 comprises a plurality of uniformly arranged circular arrays. The outer hollow connection part 21, the inner hollow connection wall 3 includes a plurality of inner hollow connection parts 31 arranged in a uniform circumferential array, the outer hollow connection part 21 and the inner hollow connection part 31 are arranged alternately on the same circumference, the flange bottom ring 1, the outer hollow connection wall 2, the inner hollow connection wall 3, the top ring tube 4 and the inner ring tube 5 are formed by a thin-walled hollow precipitation hardening stainless steel structural part processing method at one time, the top side of the top ring tube 4 is processed with a reserved process flange 41, and a thin-walled hollow precipitation hardening stainless steel structural part processing method specifically includes the following steps:

[0035] Step 1, prepare the raw materials for processing, rough turn the outer circle, inner hole and overall height, and then perform ultrasonic flaw detection;

[0036] The ultrasonic flaw detection is a non-destructive flaw detection in the prior art, which checks the surface and internal quality of parts. The AMS-STD-2154 standard is a standard widely used in the aerospace field for testing and verifying the eligibility of products. This example product is ultrasonically tested according to the AMS-STD-2154 standard and accepted at AA level.

[0037] Step 2, according to the outline of the thin-walled hollow precipitation hardened stainless steel structural part, the flange bottom ring 1, the outer circle of the outer hollow connecting wall 2 and the top ring tube 4, the inner hole of the inner hollow connecting wall 3 and the top ring tube 4, the bottom end face of the flange bottom ring 1 and the reserved process flange 41 are roughly turned. The reserved process flange 41 is used for clamping in subsequent processes, and the single-side margin is 5mm;

[0038] Step 3, rough milling the large end deep groove, that is, the large end deep groove is the gap between the outer hollow connecting wall 2 and the inner hollow connecting wall 3, the single side allowance is 3mm, using a domestic tungsten steel alloy milling cutter D8PR2, the spindle speed is 2600r / min, the feed rate is 500mm / min, and the cutting depth is 0.3mm;

[0039] Step 4: heat treatment to eliminate stress, with the bottom end of the flange bottom ring 1 facing downward, in an environment of 410°C ± 10°C, keep warm for 135min ± 10min, and air cool;

[0040] Step 5, the top surface of the reserved process flange 41 is processed as a reference surface, and the flatness of the reference surface is ensured to be 0.03;

[0041] Step 6, place the reference surface described in step 5 on the lathe chuck as the bottom surface, fix it with a small pressure plate, align the outer circle of the reference surface, semi-finish turning the bottom end surface of the flange bottom ring 1, the inner hole of the inner hollow connecting wall 3 and the top ring tube 4, and the large end deep groove, ensuring that the flatness of the bottom end surface of the flange bottom ring 1 is 0.03, the parallelism of the thickness surface is 0.05, and the single-side allowance is 0.5.

[0042] Step 7, semi-finishing milling of the large end deep groove, single-side allowance 0.5mm, using domestic tungsten steel alloy milling cutter D12PR5, spindle speed 2500r / min, feed rate 800mm / min, cutting depth 0.5mm;

[0043] Step 8, place the bottom end face of the flange bottom ring 1 on the lathe chuck, fix it with a small pressing plate, find the outer circle of the bottom end face of the flange bottom ring 1, semi-finish turning the outer circle of the top surface of the reserved process flange 41, the inner hole of the inner hollow connecting wall 3 and the top ring tube 4, and the large end deep groove, with a single-side allowance of 0.5mm;

[0044] Step 9, use 3 equal-height washers to support the bottom end face of the flange bottom ring 1, the flatness of the high washers is less than 0.01, and the flatness of the bottom end face of the flange bottom ring 1 is less than 0.05. Use three pressure plates to evenly press on the top surface of the reserved process flange 41, align the outer circle of the bottom end face of the flange bottom ring 1, and the circle jump range is within 0.005. Process the locating pin hole, use a tungsten steel tool to drill, lie, and ream the locating pin hole, and ensure that the position of the locating pin hole is 0.025, and the single-side allowance of the aperture of the locating pin hole is 0.5;

[0045] Step 10, five-axis precision milling of the hollow groove in the middle of the part, using the quick clamping positioning tool 6, the bottom end face of the flange bottom ring 1 is facing down, and the positioning pin 7 is used to determine the angle through the positioning pin hole. The three-axis vertical milling of the outer hollow connecting wall 2 outer circular end face 18 has a large hollow groove, and the large hollow groove is the gap between two adjacent outer hollow connecting parts 21, which is leveled with the CNC lathe, and the domestic tungsten steel alloy milling cutter D12PR5 is used. The spindle speed is 2500r / min, the feed rate is 800mm / min, and the cutting depth is 0.5mm;

[0046] Then, the five-axis swing angle precision milling is performed for the small hollow groove at the outer circular side wall 36 of the outer hollow connection wall 2, and the small hollow groove is the gap between two adjacent inner hollow connection parts 31. The domestic tungsten steel alloy milling cutter D8PR2 is used, the spindle speed is 2000r / min, the feed rate is 400mm / min, the cutting depth is 0.5mm, and the tool extends 40;

[0047] Step 11, with the bottom end face of the flange bottom ring 1 facing upward, align the outer circle of the bottom end face of the flange bottom ring 1, use the positioning pin 7, determine the angle through the positioning pin hole, and fine mill the large end deep groove, using a domestic tungsten steel alloy milling cutter D12PR5, with a spindle speed of 2500r / min, a feed rate of 1000mm / min, and a cutting depth of 0.5mm;

[0048] Step 12, fine turning the bottom end face of the flange bottom ring 1, the outer hollow connecting wall 2 and the outer circle of the top ring tube 4, turning around and taking the bottom end face of the flange bottom ring 1 as the reference, machining to remove the reserved process flange 41, and fine turning the end face, outer circle and inner hole of the top ring tube 4 to ensure the final size;

[0049] Step 13, with the bottom end face of the flange bottom ring 1 facing upward, align the outer circle of the bottom end face of the flange bottom ring 1, use the locating pin 7, determine the angle through the locating pin hole, and process the locating pin hole to ensure that the diameter Φ of the locating pin hole is 60~+0.015 and the position accuracy is 0.025, and complete the processing of the thin-walled hollow precipitation hardened stainless steel structural part.

[0050] The flange bottom ring 1 is processed with a plurality of positioning pin holes. When using the quick clamping positioning tool 6, the positioning pin 7 is used to determine the angle in the positioning pin hole, and the positioning pin 8 is arranged in the positioning pin hole to be fixedly connected with the quick clamping positioning tool 6.

[0051] Specific implementation method 2: Combination Figure 1-Figure 4 The present embodiment is described based on the specific embodiment 1. The present embodiment is a method for processing a thin-walled hollow precipitation hardened stainless steel structural part. The thin-walled hollow precipitation hardened stainless steel structural part comprises a flange bottom ring 1, an outer hollow connecting wall 2, an inner hollow connecting wall 3, a top ring tube 4 and an inner ring tube 5. The top of the outer hollow connecting wall 2 is connected to the top ring tube 4, the bottom of the outer hollow connecting wall 2 is connected to the flange bottom ring 1, the top of the inner hollow connecting wall 3 is connected to the inner ring tube 5, and the bottom of the inner hollow connecting wall 3 is connected to the flange bottom ring 1. The outer hollow connecting wall 2 comprises a plurality of outer hollow connecting portions 21 arranged in a uniform circumferential array, and the inner hollow connecting wall 3 comprises a plurality of uniform circumferential arrays. The inner hollow connection part 31 is arranged, the outer hollow connection part 21 and the inner hollow connection part 31 are arranged alternately on the same circumference, the flange bottom ring 1, the outer hollow connection wall 2, the inner hollow connection wall 3, the top ring tube 4 and the inner ring tube 5 are processed and formed at one time by a thin-walled hollow precipitation hardening stainless steel structural part processing method, the top ring tube 4 is processed with a reserved process flange 41 on the top side, the material of the thin-walled hollow precipitation hardening stainless steel structural part is 15-5PH, the hardness is HRC34-42, the total height is 122mm, the outer diameter of the outer hollow connection wall 2 is Φ309.6mm, the outer diameter of the top ring tube 4 is Φ186mm, and the typical wall thickness is 5.6mm;

[0052] The method for processing a thin-walled hollow precipitation hardened stainless steel structural part specifically comprises the following steps:

[0053] Step 1, prepare the raw materials for processing, rough turn the outer circle with a diameter of Φ320, the inner hole with a diameter of Φ155 and the total height, the total height is 135, and then perform ultrasonic flaw detection;

[0054] The ultrasonic flaw detection is a non-destructive flaw detection in the prior art, which checks the surface and internal quality of parts. The AMS-STD-2154 standard is a standard widely used in the aerospace field for testing and verifying the eligibility of products. This example product is ultrasonically tested according to the AMS-STD-2154 standard and accepted at AA level.

[0055] Step 2, according to the outline of the thin-walled hollow precipitation hardened stainless steel structural part, the flange bottom ring 1, the outer circle of the outer hollow connecting wall 2 and the top ring tube 4, the inner hole of the inner hollow connecting wall 3 and the top ring tube 4, the bottom end face of the flange bottom ring 1 and the reserved process flange 41 are roughly turned. The reserved process flange 41 is used for clamping in subsequent processes, and the single-side margin is 5mm;

[0056] Step 3, rough milling the large end deep groove, that is, the large end deep groove is the gap between the outer hollow connecting wall 2 and the inner hollow connecting wall 3. The depth of the large end deep groove is 56.9 mm, the width is 18.4 mm, the single-side allowance is 3 mm, and the domestic tungsten steel alloy milling cutter D8PR2 is used. The spindle speed is 2600 r / min, the feed rate is 500 mm / min, and the cutting depth is 0.3 mm;

[0057] Step 4: heat treatment to eliminate stress, with the bottom end of the flange bottom ring 1 facing downward, in an environment of 410°C ± 10°C, keep warm for 135min ± 10min, and air cool;

[0058] Step 5, the top surface of the reserved process flange 41 is processed as a reference surface, and the flatness of the reference surface is ensured to be 0.03;

[0059] Step 6, place the reference surface described in step 5 on the lathe chuck as the bottom surface, fix it with a small pressure plate, align the outer circle of the reference surface, semi-finish turning the bottom end surface of the flange bottom ring 1, the inner hole of the inner hollow connecting wall 3 and the top ring tube 4, and the large end deep groove, ensuring that the flatness of the bottom end surface of the flange bottom ring 1 is 0.03, the parallelism of the thickness surface is 0.05, and the single-side allowance is 0.5.

[0060] Step 7, semi-finishing milling of the large end deep groove, the depth of the large end deep groove is 56.9mm, the width is 26.4mm, the single-side allowance is 0.5mm, and the domestic tungsten steel alloy milling cutter D12PR5 is used. The spindle speed is 2500r / min, the feed rate is 800mm / min, and the cutting depth is 0.5mm;

[0061] Step 8, place the bottom end face of the flange bottom ring 1 on the lathe chuck, fix it with a small pressing plate, find the outer circle of the bottom end face of the flange bottom ring 1, semi-finish turning the outer circle of the top surface of the reserved process flange 41, the inner hole of the inner hollow connecting wall 3 and the top ring tube 4, and the large end deep groove, with a single-side allowance of 0.5mm;

[0062] Step 9, use 3 equal-height washers to support the bottom end face of the flange bottom ring 1, the flatness of the high washers is less than 0.01, and the flatness of the bottom end face of the flange bottom ring 1 is less than 0.05. Use three pressure plates to evenly press on the top surface of the reserved process flange 41, align the outer circle of the bottom end face of the flange bottom ring 1, and the circle jump range is within 0.005. Process the locating pin hole, use a tungsten steel tool to drill, lie, and ream the locating pin hole, and ensure that the position of the locating pin hole is 0.025, and the single-side allowance of the aperture of the locating pin hole is 0.5;

[0063] Step 10, five-axis precision milling of the hollow groove in the middle of the part, using the quick clamping positioning tool 6, the bottom end face of the flange bottom ring 1 is facing down, and the positioning pin 7 is used to determine the angle through the positioning pin hole. The three-axis vertical milling of the outer hollow connecting wall 2 outer circular end face 18 has a large hollow groove, and the large hollow groove is the gap between two adjacent outer hollow connecting parts 21, which is leveled with the CNC lathe, and the domestic tungsten steel alloy milling cutter D12PR5 is used. The spindle speed is 2500r / min, the feed rate is 800mm / min, and the cutting depth is 0.5mm;

[0064] Then, the five-axis swing angle precision milling is performed for the small hollow groove at the outer circular side wall 36 of the outer hollow connection wall 2, and the small hollow groove is the gap between two adjacent inner hollow connection parts 31. The domestic tungsten steel alloy milling cutter D8PR2 is used, the spindle speed is 2000r / min, the feed rate is 400mm / min, the cutting depth is 0.5mm, and the tool extends 40;

[0065] Step 11, with the bottom end face of the flange bottom ring 1 facing upward, align the outer circle of the bottom end face of the flange bottom ring 1, use the positioning pin 7, determine the angle through the positioning pin hole, and fine mill the large end deep groove, using a domestic tungsten steel alloy milling cutter D12PR5, with a spindle speed of 2500r / min, a feed rate of 1000mm / min, and a cutting depth of 0.5mm;

[0066] Step 12, fine turning the bottom end face of the flange bottom ring 1, the outer hollow connecting wall 2 and the outer circle of the top ring tube 4, turning around and taking the bottom end face of the flange bottom ring 1 as the reference, machining to remove the reserved process flange 41, and fine turning the end face, outer circle and inner hole of the top ring tube 4 to ensure the final size;

[0067] Step 13, with the bottom end face of the flange bottom ring 1 facing upward, align the outer circle of the bottom end face of the flange bottom ring 1, use the locating pin 7, determine the angle through the locating pin hole, and process the locating pin hole to ensure that the diameter Φ of the locating pin hole is 60~+0.015 and the position accuracy is 0.025, and complete the processing of the thin-walled hollow precipitation hardened stainless steel structural part.

[0068] The flange bottom ring 1 is processed with a plurality of positioning pin holes. When using the quick clamping positioning tool 6, the positioning pin 7 is used to determine the angle in the positioning pin hole, and the positioning pin 8 is arranged in the positioning pin hole to be fixedly connected with the quick clamping positioning tool 6.

[0069] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for processing a thin-walled hollow precipitation hardened stainless steel structural part, wherein the thin-walled hollow precipitation hardened stainless steel structural part comprises a flange bottom ring (1), an outer hollow connecting wall (2), an inner hollow connecting wall (3), a top ring tube (4) and an inner ring tube (5), wherein the outer hollow connecting wall (2) is connected to the top ring tube (4) at the top, the outer hollow connecting wall (2) is connected to the flange bottom ring (1) at the bottom, the inner hollow connecting wall (3) is connected to the inner ring tube (5) at the top, and the inner hollow connecting wall (3) is connected to the flange bottom ring (1) at the bottom, the outer hollow connecting wall (2) comprises a plurality of outer hollow connecting portions (21) arranged in a uniform circumferential array, the inner hollow connecting wall (3) comprises a plurality of inner hollow connecting portions (31) arranged in a uniform circumferential array, the outer hollow connecting portions (21) and the inner hollow connecting portions (31) are arranged alternately on the same circumference, and the method is characterized in that: The flange bottom ring (1), the outer hollow connecting wall (2), the inner hollow connecting wall (3), the top ring tube (4) and the inner ring tube (5) are formed by one-step processing through a thin-walled hollow precipitation hardening stainless steel structural component processing method. The top side of the top ring tube (4) is processed with a reserved process flange (41). The thin-walled hollow precipitation hardening stainless steel structural component processing method specifically comprises the following steps: Step 1, prepare the raw materials for processing, rough turn the outer circle, inner hole and overall height, and then perform ultrasonic flaw detection; Step 2, according to the outline of the thin-walled hollow precipitation hardened stainless steel structural part, the flange bottom ring (1), the outer circle of the outer hollow connecting wall (2) and the top ring tube (4), the inner hole of the inner hollow connecting wall (3) and the top ring tube (4), the bottom end surface of the flange bottom ring (1) and the reserved process flange (41) are roughly machined; Step 3, rough milling the large end deep groove, that is, the large end deep groove is the gap between the outer hollow connecting wall (2) and the inner hollow connecting wall (3); Step 4, heat treatment to eliminate stress, with the bottom end of the flange bottom ring (1) facing downward, in an environment of 410°C ± 10°C, keep warm for 135min ± 10min, and air cool; Step 5, the top surface of the reserved process flange (41) is processed as a reference surface, and the flatness of the reference surface is ensured to be 0.03; Step 6, place the reference surface described in step 5 as the bottom surface on the lathe chuck, fix it with a small pressure plate, align the outer circle of the reference surface, semi-finish turning the bottom end surface of the flange bottom ring (1), the inner hole of the inner hollow connecting wall (3) and the top ring tube (4), and the large end deep groove, ensuring that the flatness of the bottom end surface of the flange bottom ring (1) is 0.03, the parallelism of the thickness surface is 0.05, and the single-side allowance is 0.

5. Step 7, semi-finishing milling of the large end deep groove; Step 8, place the bottom end surface of the flange bottom ring (1) on the lathe chuck, fix it with a small pressure plate, find the outer circle of the bottom end surface of the flange bottom ring (1), semi-finish turning the outer circle of the top surface of the reserved process flange (41), the inner hole of the inner hollow connecting wall (3) and the top ring tube (4), and the large end deep groove, with a single-side allowance of 0.5mm; Step 9, use three equal-height washers to support the bottom end face of the flange bottom ring (1), use three pressure plates to evenly press on the top face of the reserved process flange (41), align the outer circle of the bottom end face of the flange bottom ring (1), and the circle runout range is within 0.

005. Process the positioning pin hole to ensure that the positioning pin hole position accuracy is 0.025, and the single-side allowance of the aperture of the positioning pin hole is 0.5; Step 10, five-axis precision milling of the hollow groove in the middle of the part, using a quick clamping and positioning tool (6), with the bottom end face of the flange bottom ring (1) facing downward, using a positioning pin (7), and using the positioning pin hole to determine the angle, three-axis vertical milling of the outer hollow connecting wall (2) at the outer circular end face 18 of the large hollow groove, the large hollow groove is the gap between two adjacent outer hollow connecting parts (21); Then, a small hollow groove is formed at the outer circular side wall 36 of the outer hollow connection wall (2) by five-axis swing angle precision milling, and the small hollow groove is the gap between two adjacent inner hollow connection parts (31); Step 11, with the bottom end face of the flange bottom ring (1) facing upward, align the outer circle of the bottom end face of the flange bottom ring (1), use the positioning pin (7), determine the angle through the positioning pin hole, and finely mill the large end deep groove; Step 12, precision turning the bottom end face of the flange bottom ring (1), the outer hollow connecting wall (2) and the outer circle of the top ring tube (4), turning around and taking the bottom end face of the flange bottom ring (1) as a reference, machining to remove the reserved process flange (41), and precision turning the end face, outer circle and inner hole of the top ring tube (4); Step 13, with the bottom end face of the flange bottom ring (1) facing upward, align the outer circle of the bottom end face of the flange bottom ring (1), use the locating pin (7), determine the angle through the locating pin hole, and process the locating pin hole to ensure that the diameter Φ of the locating pin hole is 6 (0~+0.015) and the position accuracy is 0.025, and complete the processing of the thin-walled hollow precipitation hardened stainless steel structural part.

2. A method for processing a thin-walled hollow precipitation hardened stainless steel structural part according to claim 1, characterized in that: The flange bottom ring (1) is processed with a plurality of positioning pin holes. When a quick clamping positioning tool (6) is used, the positioning pins (7) are used to determine the angle in the positioning pin holes. The positioning pins (8) are arranged in the positioning pin holes to be fixedly connected with the quick clamping positioning tool (6).

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