Stainless steel pipe joint conical surface tumbling strengthening process parameter optimization method and application

Abstract

The invention discloses a stainless steel pipe joint conical surface tumbling strengthening process parameter optimization method and application. The method comprises the steps that key process parameters influencing the tumbling strengthening machining surface state are obtained; adopting a group of tumbling strengthening process parameters to carry out tumbling strengthening processing on the conical surfaces of a batch of stainless steel pipe joints; the tumbling strengthening process parameters are optimized according to the set fluctuation coefficient, the optimized tumbling strengthening process parameters are adopted to conduct tumbling strengthening machining on the conical surfaces of the other batch of stainless steel pipe joints, and the surface state and performance after tumbling strengthening are detected; and repeating the steps in sequence, carrying out iterative optimization on the tumbling strengthening process parameters by adopting the fluctuation coefficient, and determining the optimal process parameters by analyzing the correlation among the surface yellowing, the tumbling strengthening process parameters and the surface performance data. An iterative loop analysis method combining key process parameters and surface state / performance detection is adopted to iteratively optimize the tumbling strengthening process parameters, and optimization of the tumbling strengthening process parameters is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a method for optimizing process parameters of a conical surface rolling strengthening of a stainless steel pipe joint and its application. Background Art

[0002] Stainless steel, a metal material with high strength, high plasticity, and excellent corrosion resistance, is commonly used in connectors for various piping systems. Austenitic stainless steel, characterized by high toughness and low thermal conductivity, presents difficulties in machining, including significant plastic deformation, severe work hardening, and high cutting heat, placing stringent control on machining parameters.

[0003] Rolling and strengthening of pipe fittings is a process that can effectively reduce the surface roughness of parts and improve the sealing performance of pipe connectors. Rolling uses high-hardness smooth rollers to directly contact the conical surface of the pipe fitting, causing localized micro-plastic deformation of the processed surface, reducing the height difference between surface protrusions and depressions, and achieving ultra-finishing to reduce surface roughness. Due to the presence of contact pressure and friction, heat is inevitably generated during the processing. The passive oxide film formed on the surface of stainless steel plays a key protective role in improving the corrosion resistance of the alloy. High temperature environments can change the structure and thickness of the oxide film on the surface of stainless steel, resulting in changes in its density and affecting the corrosion resistance of the material.

[0004] At present, the roller burnishing strengthening process mainly adopts the process of combining ball-type roller burnishing tools with CNC equipment, focusing on the processing efficiency, cost, and surface strengthening effect of parts. During the roller burnishing strengthening process of the conical surface of stainless steel pipe joints, the product will have the problem of yellowing and discoloration of the conical surface of the pipe joints, affecting the surface quality of the product. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for optimizing process parameters of rolling-burnishing strengthening of the conical surface of a stainless steel pipe joint and its application, so as to solve the problem of yellowing and discoloration of the conical surface of the pipe joint.

[0006] The present invention is achieved through the following technical solutions: The optimization method of process parameters for the conical surface rolling strengthening of stainless steel pipe joints includes: Obtain key process parameters that affect the surface condition of roller burnishing; A set of roller burnishing process parameters were used to perform roller burnishing on the conical surfaces of a batch of stainless steel pipe joints, and the surface condition and performance after roller burnishing were tested. The tumbling process parameters were optimized according to the set fluctuation coefficient. Another batch of stainless steel pipe fittings were tumbling-processed with the optimized tumbling process parameters. The surface condition and performance after tumbling were tested. The tumbling process parameters were iteratively optimized using the fluctuation coefficient in a cycle until the yellowing problem was found during the surface condition test. The differences in performance test data of each batch of roller burnishing surfaces were compared, and the optimal process parameters were determined by analyzing the correlation between surface yellowing and roller burnishing process parameters and surface performance data.

[0007] In some embodiments of the present invention, the correlation between surface yellowing and roller burnishing process parameters and surface performance data is that the roller burnishing process parameters used are positively correlated with the cutting heat and surface performance data generated by the processing, and negatively correlated with the probability of surface yellowing.

[0008] In some embodiments of the present invention, among the iteratively optimized sets of roller burnishing process parameters, the previous set of roller burnishing process parameters corresponding to the surface yellowing problem is used as the optimal process parameters.

[0009] In some embodiments of the present invention, key process parameters affecting the surface state of the roller burnishing process are obtained based on the force model of the roller burnishing process of the conical surface of the pipe joint and the calculation formula of the cutting heat generated during the process.

[0010] In some embodiments of the present invention, the key process parameters obtained include cutting speed, feed speed, feed depth and rolling force.

[0011] In some embodiments of the present invention, the cutting speed, feed speed, and feed depth are set input parameters of the processing equipment, and the rolling force is obtained by measurement.

[0012] In some embodiments of the present invention, the fluctuation coefficient is determined according to the accuracy of processing equipment and detection equipment.

[0013] In some embodiments of the present invention, the detection of the surface state after roller burnishing includes detecting the surface appearance color, surface roughness, and surface damage.

[0014] In some embodiments of the present invention, testing the surface properties after roller burnishing includes testing the depth of the surface work-hardened layer, the surface oxygen content, and the hardness of the surface work-hardened layer and the substrate area.

[0015] On the other hand, the present invention also provides an application of the method for optimizing process parameters for rolling-burnishing strengthening of the conical surface of a stainless steel pipe joint, and the conical surface of the stainless steel pipe joint is subjected to rolling-burnishing strengthening processing using the obtained optimal process parameters.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention analyzes the mechanism that causes yellowing of the roller-burnished surface of the conical surface of the stainless steel pipe joint, extracts the key process parameters that cause the problem, and adopts an iterative cycle analysis method that combines the key process parameters with surface state / performance detection to iteratively optimize the roller-burnishing process parameters, thereby achieving optimization of the roller-burnishing process parameters and effectively solving the problem of yellowing of the roller-burnished surface of the conical surface of the stainless steel pipe joint.

[0017] The present invention is based on the iterative cycle optimization path of "quality inspection-failure analysis-parameter optimization", realizing the closed loop of "problem mechanism-optimization-verification" and ensuring the stability of the optimization effect.

[0018] The present invention comprehensively considers the influence of cutting heat on the quality of stainless steel pipe joint parts, eliminates the influence of the roller burnishing strengthening process on the surface quality of the pipe joint, and can take into account the surface strengthening effects such as surface roughness, thereby well ensuring the surface processing quality of the roller burnishing strengthening. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a logic diagram of the method for optimizing process parameters for rolling-burnishing strengthening of the conical surface of a stainless steel pipe joint according to an embodiment of the present invention.

[0021] Figure 2 This is a flow chart of a method for optimizing process parameters for rolling-burnishing strengthening of a conical surface of a stainless steel pipe joint according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0023] The present invention adopts an iterative cycle analysis method of "part surface state - surface performance - roller burnishing strengthening process parameters - part surface state". By analyzing the mechanism of yellowing of the conical surface, the roller burnishing strengthening process parameters are iteratively optimized to obtain a combination of process parameters that ensure the stability of the part state, so as to solve the problem of yellowing of the surface of stainless steel pipe joints after conical surface roller burnishing strengthening processing.

[0024] In some embodiments of the present invention, the method for optimizing the process parameters of the tapered surface rolling strengthening of the stainless steel pipe joint is as follows: Figure 1 and Figure 2 , including the following steps: 1) Obtain key process parameters for roller burnishing The roller burnishing strengthening process parameters that affect the roller burnishing strengthening processing performance of the conical surface of stainless steel pipe joints are analyzed, and the key process parameters that affect the roller burnishing strengthening processing performance of the conical surface of stainless steel pipe joints are determined.

[0025] After analysis, it was found that the direct factor affecting the yellowing and discoloration of the conical surface of stainless steel pipe joints in the rolling strengthening process is the cutting heat generated during the rolling process.

[0026] The interaction between the roller burnishing process of the pipe joint is mainly concentrated on the roller tool and the conical surface of the pipe joint. There is almost no cutting in the process, so it can be applied to the shear action model. Based on this model, the calculation formula for the cutting heat generated per unit area on the shear surface per unit time during the roller burnishing process is: ; Where: F S It is shear force, and its magnitude is mainly affected by the magnitude of rolling pressure; v S is the cutting speed, which is a process parameter that can be directly controlled by the processing equipment; A C is the contact area, the size of which is mainly affected by the tool size and feed depth; is the cutting angle, which is determined by the relative position of the roller tool and the conical surface of the pipe joint during the roller burnishing process and is a constant value.

[0027] According to the above calculation formula, in the tapered surface rolling strengthening process of stainless steel pipe joints, cutting speed, feed speed, feed depth and rolling force are the key process parameters that affect the generation of cutting heat during the processing and thus cause surface yellowing.

[0028] Among them, cutting speed, feed speed, and feed depth are parameters that can be directly set in the processing equipment, and rolling force is a parameter that can be directly measured during the processing.

[0029] 2) Roller burnishing process parameter setting According to the key process parameters obtained, the four basic parameters: cutting speed, feed speed, feed depth, and rolling force are recorded as v S 、 v f 、 H f 、F N , establish a four-dimensional vector group that can characterize the effect of cutting heat on roller burnishing ( v S , v f , H f , F N ),in, v S 、 v f 、 H f Initial input parameters for processing equipment, F N Directly measured parameters.

[0030] For a batch of stainless steel pipe joints of the same specifications, set a set of initial processing parameters ( v S 、 v f 、 H f ), a batch of stainless steel pipe joints were subjected to roller burnishing and strengthening processing using the initial processing parameters, and the corresponding rolling force during the roller burnishing and strengthening process was measured. F N A set of initial process parameter combinations is obtained based on the measured values.

[0031] 3) Surface condition and performance inspection of the conical surface of stainless steel pipe joints Test the surface condition of the conical surface of the stainless steel pipe joint to check whether the key indicators of the roller-burnished surface meet the standard requirements, including: Use visual inspection or a colorimeter to check whether the appearance color of the parts meets the requirements of brightness and no discoloration; Use a profilometer to check whether the surface roughness of parts meets the standard requirements; Use visual inspection or a magnifying glass to inspect the surface of the part for damage that exceeds the standard tolerance.

[0032] The surface properties of the conical surface of the stainless steel pipe joint are tested, and the material structure characterization and analysis of the roller burnished surface are performed, including: Use metallographic analysis method to detect the depth of work hardening layer on the surface of pipe joint after roller burnishing; Use EDS energy spectrum analysis or XPS to detect the oxygen content on the surface of the pipe joint after roller burnishing; Use a microhardness tester or nanoindenter to test the hardness of the surface work-hardening layer and the base area of the pipe joint after roller burnishing.

[0033] 4) Iterative optimization of key process parameters Combined with the accuracy of processing and testing equipment, the process parameter fluctuation coefficient is set based on the principle of controllable small step fluctuation. (usually 0.9-1.1), according to the set fluctuation parameters Iterative optimization of key process parameters.

[0034] When the color, roughness and surface condition of the roller burnished surface meet the technical requirements, the set fluctuation parameters are used. Iterative optimization of key process parameters, such as fluctuating parameters The maximum value Multiplying by the initial processing parameters, we get the iteratively optimized processing parameters, which are expressed as .

[0035] The processing parameters were used to perform roller burnishing on the conical surfaces of a batch of stainless steel pipe joints, and the corresponding rolling force during the roller burnishing process was measured. F N The measured values of , get another set of process parameter combinations after optimization iteration, expressed as , It is the measured value of rolling force in this set of process parameter combinations.

[0036] The process is repeated in sequence. When the color, roughness and surface state of the roller-burnished surface meet the technical requirements, the key process parameters are iteratively optimized with the set fluctuation coefficient based on the parameters optimized in the previous iteration until the color, roughness and surface state of the roller-burnished surface no longer meet the technical requirements.

[0037] For batches of pipe joint parts with abnormal yellowing on the surface, failure analysis methods are used to compare the differences in parameters such as the depth of the hardened layer, hardness, and oxygen content of their materials with those of qualified materials. The deep mechanism and process influence of the yellowing of the roll-hardened surface of the pipe joints are analyzed. Through the composition differences and combined with other theoretical studies, the influencing factors causing the yellowing of the roll-hardened surface are confirmed. The optimal process parameters are determined based on the analysis results and the roller burnishing strengthening process parameters used in each batch.

[0038] Through analysis, it was found that the depth, hardness and oxygen content of the hardened layer that turned yellow on the surface after roller burnishing were greater than those of the roller burnished surface of the batch without abnormalities. The cutting speed, feed speed, feed depth and rolling force of the process parameters corresponding to the abnormalities were all greater. At this time, the cutting heat generated during the roller burnishing process was also greater, indicating that the yellowing of the roller burnished surface of the pipe joint was caused by excessive cutting heat.

[0039] Based on the above analysis, the set of roller burnishing process parameters used in each batch that did not cause yellowing in local areas of the surface and had the largest parameter values was taken as the optimal process parameters.

[0040] For example, the roller burnishing process parameter combination used in the previous round ( v S0 , v f0 , H f0 , F N0 ) can process qualified stainless steel pipe joint conical surface, and the next round of roller burnishing strengthening process parameter combination , is the measured value of rolling force in this set of rolling strengthening process parameter combination. If the conical surface of the stainless steel pipe joint obtained by processing turns yellow, the previous round of process parameter combination ( v S0 , v f0 , H f0 , F N0 ) as the optimal process parameters for laser strengthening processing of stainless steel pipe joints of this specification. This optimal process parameter can not only avoid the influence of cutting heat on the surface state, but also ensure the processing effect of roller burnishing strengthening the surface.

[0041] The process of the method of the present invention is described in detail below with reference to specific embodiments.

[0042] (1) Rolling process parameter setting Targeting D N =12mm 1Cr18Ni9Ti stainless steel pipe joint, the process parameters that affect the cutting heat generated during the roller burnishing strengthening process of this specification pipe joint are cutting speed, feed speed, and feed depth. According to production experience, ( v S 、 v f 、 H f ) The initial input value is set to (400r / min, 0.01mm / r, 0.03mm), and the rolling force is measured using a dynamometer during the roller burnishing process. F N The measured value is 826N, and the initial process parameter combination is (400r / min, 0.01mm / r, 0.03mm, 800N).

[0043] (2) First round of surface condition inspection The conical surface of the stainless steel pipe joint processed according to the initial process parameters is bright and has no discoloration, the average surface roughness is Ra0.5, and there is no obvious damage on the processed surface, which meets the processing surface condition requirements.

[0044] (3) First round of surface performance testing Material characterization and analysis were carried out on the machined surface of the stainless steel pipe joint. The metallographic analysis method was used, and the depth of the work-hardened layer on the material surface was found to be approximately 20 μm. The oxygen content of the roller-burnished surface of the pipe joint was measured by EDS energy spectrum analysis, which was approximately 0.8%. The hardness of the work-hardened layer and the substrate area of the roller-burnished surface of the pipe joint was measured by a microhardness tester, which were approximately 216 HV0.1 and 194 HV0.1, respectively.

[0045] (4) The first round of iterative optimization of process parameters According to the accuracy of processing and testing equipment, the process parameter fluctuation coefficient is set based on the principle of controllable small step fluctuation. is 1.1.

[0046] according to Figure 2 The process is optimized and iterated according to the process parameters. The surface color, roughness and surface condition of the first round of parts processing all meet the technical requirements. =1.1 multiplied by the processing parameters of the first round as the processing parameters for the new round of roller burnishing, and the next batch of parts are processed. That is, the input parameters of the second round of roller burnishing process parameters are set to (440r / min, 0.011mm / r, 0.033mm). The dynamometer is used to measure the rolling force in the second round of processing. F N The measured value is 898N, that is, the process parameter combination of the second round of roller burnishing is (440r / min, 0.011mm / r, 0.033mm, 898N).

[0047] (5) Second round of surface condition inspection The surface of the stainless steel pipe joint parts processed according to the initial process parameters is bright and has no discoloration, the average surface roughness is Ra0.3, and there is no obvious damage on the processed surface, which meets the processing surface condition requirements.

[0048] (6) Second round of surface performance testing Material characterization and analysis were carried out on the processed surface of the stainless steel pipe joint. The metallographic analysis method was used, and the depth of the work-hardened layer on the material surface was obtained to be approximately 33 μm. The oxygen content of the roller-burnished surface of the pipe joint was measured by EDS energy spectrum analysis, which was approximately 1.1%. The hardness of the work-hardened layer and the matrix area of the roller-burnished surface of the pipe joint was measured by a microhardness tester, which were approximately 236 HV0.1 and 195 HV0.1, respectively.

[0049] (7) Second round of iterative optimization of process parameters according to Figure 2 The process parameters are optimized and iterated. The second round of parts processing surface color, roughness and surface state meet the technical requirements, and the third round of material characterization is carried out to determine the fluctuation coefficient. =1.1 multiplied by the second round of processing parameters as the processing parameters for the new round of roller burnishing strengthening processing, the next batch of parts processing, that is, the third round of roller burnishing process parameter equipment input parameters are set to (484r / min, 0.012mm / r, 0.036mm), the third round of processing uses a dynamometer to measure the rolling force F N The measured value is 959N, that is, the process parameter combination of the third round of roller burnishing is (484r / min, 0.012mm / r, 0.036mm, 959N).

[0050] (8) The third round of surface condition inspection The surface of the stainless steel pipe joint parts processed according to the initial process parameters showed yellowing in some areas, the average surface roughness was Ra0.2, and no obvious damage was found on the processed surface.

[0051] The surface condition of the parts does not meet the requirements of bright surface and no discoloration.

[0052] (9) The third round of surface performance testing Material characterization and analysis were carried out on the processed surface of the stainless steel pipe joint. The metallographic analysis method was used, and the depth of the work-hardened layer on the material surface was obtained to be approximately 86μm. The oxygen content of the roller-burnished surface of the pipe joint was measured by EDS energy spectrum analysis, which was approximately 2.3%. The hardness of the work-hardened layer and the matrix area of the roller-burnished surface of the pipe joint was measured by a microhardness tester, which were approximately 246HV0.1 and 195HV0.1, respectively.

[0053] For batches of pipe fittings exhibiting abnormal surface yellowing, failure analysis compared parameters such as the hardened layer depth, hardness, and oxygen content with those of qualified materials. This revealed that the hardened layer depth, hardness, and oxygen content of stainless steel pipe fittings with yellowed conical surfaces after roller burnishing were deeper, harder, and higher in oxygen. Furthermore, the corresponding process parameters, including cutting speed, feed rate, feed depth, and rolling force, were all higher, further demonstrating that the yellowing of the pipe fittings was caused by excessive cutting heat during the roller burnishing process. Compared to the next step of iterative optimization of process parameters, the second round of roller burnishing achieved optimal results while maintaining the surface condition of the parts.

[0054] (10) Determine the optimized process parameters Reference Figure 2 The output stable and optimized process parameters are the second round process parameters (440r / min, 0.011mm / r, 0.033mm, 898N). This set of process parameters is used to perform roller burnishing and strengthening processing on the conical surface of the stainless steel pipe joints of this batch of specifications.

[0055] According to the inspection of the surface condition of the processed parts, the surface condition of the processed parts is stable, there is no yellowing problem on the surface, and the surface performance can meet the requirements of the roller burnishing strengthening process.

[0056] On the other hand, in some embodiments of the present invention, a method for optimizing process parameters for rolling-hardening the conical surface of a stainless steel pipe joint is applied, and the conical surface of the stainless steel pipe joint is subjected to rolling-hardening processing using the optimal process parameters obtained in the above embodiments.

[0057] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0058] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of the present invention does not necessarily imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0059] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for optimizing process parameters for roller burnishing and strengthening the conical surface of a stainless steel pipe joint, characterized in that: include: Obtain key process parameters that affect the surface condition of roller burnishing; A set of roller burnishing process parameters were used to perform roller burnishing on the conical surfaces of a batch of stainless steel pipe joints, and the surface condition and performance after roller burnishing were tested. The tumbling process parameters were optimized according to the set fluctuation coefficient. Another batch of stainless steel pipe fittings were tumbling-processed with the optimized tumbling process parameters. The surface condition and performance after tumbling were tested. The tumbling process parameters were iteratively optimized using the fluctuation coefficient in a cycle until the yellowing problem was found during the surface condition test. The differences in performance test data of each batch of roller burnishing surfaces were compared, and the optimal process parameters were determined by analyzing the correlation between surface yellowing and roller burnishing process parameters and surface performance data.

2. The method for optimizing process parameters for rolling burnishing of a stainless steel pipe joint tapered surface according to claim 1, characterized in that: The correlation between surface yellowing and roller burnishing process parameters and surface performance data is that the roller burnishing process parameters used are positively correlated with the cutting heat generated by processing and surface performance data, and negatively correlated with the probability of surface yellowing.

3. The method for optimizing process parameters for rolling burnishing of a stainless steel pipe joint tapered surface according to claim 2, characterized in that: Among the iteratively optimized groups of roller burnishing process parameters, the previous group of roller burnishing process parameters corresponding to the surface yellowing problem is taken as the optimal process parameters.

4. The method for optimizing process parameters for rolling burnishing of a stainless steel pipe joint tapered surface according to claim 1, characterized in that: According to the force model of the roller burnishing process on the conical surface of the pipe joint and the calculation formula of the cutting heat generated during the processing, the key process parameters affecting the surface state of the roller burnishing process are obtained.

5. The method for optimizing process parameters for rolling burnishing strengthening of the conical surface of a stainless steel pipe joint according to claim 1 or 4, characterized in that: The key process parameters obtained include cutting speed, feed rate, feed depth and rolling force.

6. The method for optimizing process parameters for rolling burnishing strengthening of the conical surface of a stainless steel pipe joint according to claim 5, characterized in that: The cutting speed, feed speed, and feed depth are set processing equipment input parameters, and the rolling force is obtained through measurement.

7. The method for optimizing process parameters for rolling burnishing of a stainless steel pipe joint tapered surface according to claim 6, characterized in that: The fluctuation coefficient is determined according to the accuracy of the processing equipment and the detection equipment.

8. The method for optimizing process parameters for rolling burnishing strengthening of a stainless steel pipe joint tapered surface according to claim 1, characterized in that: The inspection of the surface condition after roller burnishing includes the inspection of surface appearance color, surface roughness and surface damage.

9. The method for optimizing process parameters for rolling burnishing strengthening of a stainless steel pipe joint tapered surface according to claim 1 or 2, characterized in that: The surface properties after roller burnishing are tested, including the depth of the surface work-hardened layer, the surface oxygen content, and the hardness of the surface work-hardened layer and the substrate area.

10. Application of the method for optimizing process parameters for tapered rolling strengthening of stainless steel pipe joints according to any one of claims 1 to 9, characterized in that: The obtained optimal process parameters are used to perform roller burnishing on the conical surface of the stainless steel pipe joint.

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