Method for manufacturing a piston ring

Abstract

The present application relates to the technical field of piston ring processing, and particularly relates to a piston ring preparation method. The piston ring comprises a ring body with a notch in the circumferential direction, and the ring body has an upper surface in the axial direction of the ring body, and the upper side surfaces on both sides of the notch are provided with convex structures. According to the piston ring, the piston ring is provided with a notch in the circumferential direction, and the upper side surfaces on both sides of the notch are provided with convex structures, the convex structures enable the piston ring to form a small gap with the upper side of the piston ring groove when the piston ring runs to the upper side of the piston ring groove, gas enters the ring groove through the gap, the pressure at the high-pressure position is reduced, the internal and external pressure difference is reduced, and then the piston ring is not prone to collapse. Due to the arrangement of the convex structures, the rigidity of the notch is effectively enhanced, and the risk of radial contraction and collapse of the piston ring under high pressure difference is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of piston ring processing, and particularly relates to a piston ring preparation method. BACKGROUND

[0002] Piston ring is a key sealing element in internal combustion engine, and its main functions are sealing cylinder, controlling oil consumption and conducting heat. In the prior art, the axial height of the piston ring is usually designed to be uniform, and such design is relatively simple in manufacturing and installation, but has some significant defects. In particular, at the notch of the piston ring, the uniform design of the axial height leads to weak rigidity at the position, and collapse phenomenon is prone to occur. The main reason for the collapse is that when the piston ring moves to the upper side of the ring groove, the internal and external pressure difference is large, and the notch of the piston ring is radially contracted inward due to insufficient rigidity, so that it is separated from the cylinder wall. This condition not only increases the oil consumption and air leakage, but also can cause serious piston scuffing phenomenon, affecting the performance and service life of the engine. SUMMARY

[0003] The purpose of the present application is to at least solve the problem that the piston ring is prone to collapse at the notch under high internal and external pressure difference. The purpose is achieved by the following technical scheme:

[0004] The first aspect of the present application provides a piston ring, which is arranged in an engine, the engine comprising a piston body having a piston ring groove, the piston ring comprising a ring body having a notch, the ring body having an upper side arranged to face the upper side of the piston ring groove in the axial direction of the ring body, and the upper sides on both sides of the notch are provided with a protruding structure.

[0005] According to the piston ring of the present application, the ring body of the piston ring is provided with a notch, and the upper sides on both sides of the notch are provided with a protruding structure, so that the piston ring can abut against the piston ring groove and form a small gap when it runs to the upper side of the piston ring groove. The gas enters the piston ring groove through the gap, reduces the pressure at the high pressure position, reduces the internal and external pressure difference, and then the piston ring is not prone to collapse. In addition, due to the arrangement of the protruding structure, the rigidity of the notch is effectively enhanced, and the risk of radial contraction and collapse of the piston ring under high pressure difference is reduced.

[0006] In addition, the piston ring according to the present application can also have the following additional technical features:

[0007] In some embodiments of the present application, the center angle formed by the opposite sides of the protruding structure in the circumferential direction of the ring body is 30-60 degrees.

[0008] In some embodiments of the present application, the center angle is 45 degrees.

[0009] In some embodiments of the present application, the protruding structure has a first dimension in the axial direction of the ring body, and the first dimension decreases from the edge of the gap to the side away from the gap in the circumferential direction of the ring body;

[0010] And / or, the protruding structure is flush with the edge of the gap in the circumferential direction of the ring body;

[0011] And / or, the protruding structures on both sides of the gap are symmetrically arranged on opposite sides of the gap in the circumferential direction of the ring body.

[0012] The second aspect of the present application provides a piston assembly, comprising:

[0013] A piston body, the piston body is provided with a piston ring groove;

[0014] The piston ring described above is arranged in the piston ring groove.

[0015] The third aspect of the present application provides an engine, comprising:

[0016] A cylinder block, the cylinder block comprises a plurality of cylinders;

[0017] A cylinder head, the cylinder head is mounted on the top of the cylinder block;

[0018] A plurality of the above-mentioned piston assemblies, a plurality of the piston assemblies are arranged one by one in a plurality of the cylinders.

[0019] The fourth aspect of the present application provides a preparation method of a piston ring, for preparing the above-mentioned piston ring, comprising the following steps:

[0020] Providing a ring body, the middle position of the gap of the ring body is 0° in the circumferential direction of the ring body, and the stiffness value of the ring body at each angle position between 0° and 360° is calculated;

[0021] The average stiffness value is calculated according to the stiffness value between the first angle and the second angle away from the gap;

[0022] Constructing a fitting function;

[0023] According to the average stiffness value and the fitting function, the dimension of the protruding structure in the axial direction of the ring body at each angle position is calculated;

[0024] The protruding structure is arranged on the upper surface on both sides of the gap of the ring body.

[0025] In some embodiments of the present application, the step of calculating the stiffness value at each angle position comprises:

[0026] A finite element model of the piston ring is established, and the piston ring is evenly divided into 360 parts according to the angle, which are respectively corresponding to each angle between 0° and 360°;

[0027] A radial force F of 200 N is applied at each angle position, and the freedom perpendicular to the position plane is constrained;

[0028] After the radial force F is applied, the radial deformation amount of the corresponding angle position is extracted;

[0029] According to the formula The stiffness value of each angle position is calculated, wherein k is the stiffness value of each angle, and δ is the radial deformation amount.

[0030] In some embodiments of the present application, the first angle is 45°, and the second angle is 315°.

[0031] In some embodiments of the present application, the fitting function is , wherein k is the stiffness value at angle θ, h is the axial height of the convex structure at angle θ, a is the first fitting function, and b is the second fitting function. BRIEF DESCRIPTION OF DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not intended to be limiting thereof. The same reference numerals in different drawings identify the same components throughout the text. In the drawings:

[0033] Figure 1 A first perspective structural schematic diagram of a piston ring according to an embodiment of the present application is schematically shown;

[0034] Figure 2 A second perspective partial structural schematic diagram of a piston ring according to an embodiment of the present application is schematically shown;

[0035] Figure 3 A partial structural schematic diagram of a piston ring according to an embodiment of the present application is schematically shown, which is arranged in a piston ring groove and abuts against the upper side of the piston ring groove to be twisted;

[0036] Figure 4 A flowchart of a preparation method of the piston ring of the present embodiment is shown.

[0037] The reference numerals are as follows:

[0038] 10, ring body; 101, notch; 102, upper side; 11, convex structure; 200, piston ring groove; 201, gap; 202, upper side; 203, lower side. DETAILED DESCRIPTION

[0039] Example embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0040] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0041] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0042] Spatially relative terms, such as "internal", "external", "inner", "outer", "under", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be oriented in any direction in addition to the orientation depicted in the figures.

[0043] AsFigures 1 to 3 As shown, according to the embodiments of the present application, a piston ring is provided, which comprises a ring body 10 having a notch 101 in the circumferential direction, and the ring body 10 has an upper side 102 in the axial direction of the ring body 10, which is used to be arranged to face the upper side 202 of the piston ring groove, and the upper side 102 on both sides of the notch 101 is provided with a protruding structure 11.

[0044] According to the piston ring of the present application, the piston ring is provided with a notch 101 in the circumferential direction, and the upper side 102 on both sides of the notch 101 is provided with a protruding structure 11, which enables the piston ring to form a small gap 201 with the upper side 202 of the piston ring groove 200 when running to the upper side 202 of the piston ring groove 200, so that the gas enters the piston ring groove 200 through the gap 201, reduces the pressure at the high pressure, reduces the internal and external pressure difference, and further reduces the risk of collapse of the piston ring. In addition, due to the arrangement of the protruding structure 11, the rigidity of the notch 101 is effectively enhanced, and the risk of radial contraction and collapse of the piston ring under high pressure difference is reduced.

[0045] In some embodiments, the opposite sides of the protruding structure 11 form a central angle of 30°-60° at the center of the ring body in the circumferential direction of the ring body 10. The ring body 10 has a zero line, and the middle of the notch 101 to the center of the ring body 10 is the zero line, and the included angle formed by the zero line and the end of the protruding structure 11 away from the notch 101 is the central angle.

[0046] Specifically, the central angle is 45°, which means that the ring body 10 is provided with the protruding structure 11 between 0° and 45°, and the ring body 10 is provided with the protruding structure 11 between 315° and 360°. In the range of 0° to 45°, the height of the protruding structure 11 gradually decreases from the zero line until it reaches the lowest position at the 45° position, i.e. the same height as the ring body 10, and in the range of 315° to 360°, the height change of the protruding structure 11 is symmetrically distributed with the change in the range of 0° to 45°, which ensures the overall symmetry of the structure of the ring body 10.

[0047] It can be understood that the protruding structure 11 is flush with the edge of the notch 101.

[0048] It can be understood that the protruding structure 11 has a first size in the axial direction of the ring body 10, and the first size decreases from the edge of the notch 101 to the side away from the notch 101 in the circumferential direction of the ring body 10. The design that the height (i.e. the first size) of the protruding structure 11 gradually decreases in the direction away from the notch 101 makes the stress distribution of the piston ring more uniform during operation, avoids stress concentration, reduces the risk of structural fatigue and fracture, thereby prolonging the service life of the piston ring. At the same time, as the height of the protruding structure 11 gradually decreases, the piston ring can better fit the ring groove wall at different positions, forming a more tight seal, especially at the notch 101, reducing the amount of gas leakage, improving the sealing effect, and ensuring the compression efficiency of the engine. In addition, under high temperature environment, the piston ring and the ring groove will expand, and the gradually decreasing height of the protruding structure 11 can better adapt to the thermal expansion change, maintain good sealing performance and structural stability.

[0049] It can be understood that the two protruding structures 11 on both sides of the notch 101 are symmetrically arranged with the notch 101 as the center in the circumferential direction of the ring body 10. The two protruding structures 11 on both sides of the notch 101 are mirror-symmetrically arranged with the notch 101 as the center, that is, the protruding structures 11 extending from both sides of the notch 101 are symmetrically distributed in shape and height change. The mirror-symmetrical design ensures the uniform distribution of stress of the piston ring during operation, reduces the stress concentration phenomenon, and improves the durability and reliability of the structure.

[0050] It can be understood that the outer surfaces of the ring body 10 and the protruding structure 11 are chrome-plated or nitrided to enhance wear resistance and corrosion resistance.

[0051] The working principle of the present embodiment is that when the piston ring runs to the upper side 202 of the piston ring groove 200, the piston ring will be attached to the upper side 202 of the piston ring groove 200 under the action of inertial force and piston ring bottom pressure, and will be twisted to a certain extent. In the range of 0° to 45° of the ring body 10, a certain gap 201 channel is formed, and the gas enters the ring groove through the gap 201, so that the pressure difference between the ring groove and the ring bank is reduced, thereby reducing the risk of collapse of the piston ring. At the same time, the axial height of the notch 101 is increased, the stiffness is improved, and the risk of collapse of the piston ring is also reduced.

[0052] It can be understood that the piston ring groove 200 also has a lower side 203, but the lower side of the piston ring groove 200 is not considered in the present embodiment, so it is not described in detail.

[0053] The embodiment also provides a piston assembly, which comprises a piston body and the piston ring, the piston body is provided with a piston ring groove 200, and the piston ring is arranged in the piston ring groove 200. The piston body is provided with three piston ring grooves 200, which are two compression ring grooves and one oil ring groove, and the piston ring is arranged in the two compression ring grooves. The shape of the piston ring groove 200 matches the shape of the piston ring, so that the piston ring can move freely in the ring groove without excessive clearance, thereby avoiding air leakage and excessive oil consumption.

[0054] The embodiment also provides an engine, which comprises a cylinder block, a cylinder head and the piston assembly, the cylinder block comprises a plurality of cylinders, the cylinder head is arranged on the top of the cylinder block, and the plurality of piston assemblies are arranged in the plurality of cylinders in one-to-one correspondence.

[0055] In some embodiments, the cylinder block is provided with a cooling water channel for circulating cooling liquid to take away heat generated in the working process and maintain a suitable working temperature.

[0056] As shown in Figure 4 The embodiment also provides a preparation method of the piston ring, which comprises the following steps:

[0057] The ring body 10 is provided, the middle position of the notch 101 of the ring body 10 is 0° along the circumference of the ring body 10, and the stiffness values of the ring body at each angle position between 100° and 360° are calculated;

[0058] The average stiffness value is calculated according to the stiffness values between the first angle and the second angle away from the notch 101;

[0059] The fitting function is constructed;

[0060] The size of the convex structure 11 in the axial direction of the ring body 10 at each angle position is calculated according to the average stiffness value and the fitting function;

[0061] The convex structure 11 is arranged on the upper side 102 of the ring body 10 on both sides of the notch 101.

[0062] It can be understood that the notch 101 of the piston ring is usually the weakest part in structure and is prone to deformation or collapse. In order to improve the stiffness of the notch 101 and make the stiffness of the notch 101 closer to that of other areas, a reference stiffness value needs to be determined, which is the average stiffness value. In addition, by adjusting the axial height of the notch 101, the stiffness value of the notch 101 can reach the average stiffness value, so that the sealing performance of the piston ring can be improved. After the stiffness of the notch 101 is enhanced, the piston ring can closely fit the cylinder wall during operation, so that air leakage is reduced and the efficiency of the engine is improved.

[0063] AsFigure 1 As shown, specifically, the step of calculating the stiffness value of each angular position includes:

[0064] A finite element model of the piston ring is established, and the piston ring is evenly divided into 360 parts according to the angle, which are one-to-one corresponding to each angle between 0° and 360°;

[0065] A radial force F of 200N is applied at each angular position, and the freedom perpendicular to the plane of the position is constrained;

[0066] After applying the radial force F, the radial deformation amount corresponding to the angular position is extracted;

[0067] According to the formula The stiffness value of each angular position is calculated, where k is the stiffness value of each angle, and δ is the radial deformation amount.

[0068] It can be understood that, in order to establish the finite element model of the piston ring, first, a three-dimensional geometric model of the piston ring is created using finite element analysis software (such as ANSYS, ABAQUS or SolidWorks Simulation), and its cross section is drawn according to the actual size and shape, and then the complete model is generated by rotation. Next, the model is meshed, and appropriate mesh types (such as quadrilateral mesh, hexahedral mesh or tetrahedral mesh) are selected, and finer meshes are used at key positions (such as the notch 101 and the protruding structure 11) to improve calculation accuracy. Then, define the material properties of the piston ring, including elastic modulus, Poisson's ratio, density and thermal expansion coefficient, and assign these properties to the geometric model. When applying loads and defining boundary conditions, according to the actual working conditions, a radial force F of 200N is applied at a specific position of the piston ring (such as the 0° position), while the three degrees of freedom (radial, circumferential, axial) of the piston ring in the 90° direction plane are constrained. Select appropriate solver types (such as linear statics, nonlinear statics or dynamics analysis), set the solution accuracy and iteration number parameters, and run the solution. The software will perform finite element analysis according to the set load and boundary conditions to calculate the stress, strain and deformation of the piston ring. After solving, view and analyze the stress distribution, strain distribution and deformation, and pay special attention to the stress concentration at the notch 101 and the protruding structure 11 to verify the correctness of the model. If necessary, adjust the mesh density, load and boundary conditions, and re-solve, and generate stress, strain and deformation contour maps and animations through the post-processing function of the software to help understand and display the analysis results. Through these steps, an accurate finite element model of the piston ring can be established for stress analysis and structural optimization, providing reliable basis for the design and improvement of the piston ring.

[0069] It can be understood that the radial force F of 200N is applied in sequence at each angular position (such as 0°, 1°, 2°, …, 360°) of the piston ring. Ensure that the direction of the applied radial force is correct, corresponding to the radial direction of each angular position. In the plane perpendicular to the position of the applied radial force, constrain three degrees of freedom (radial, circumferential, axial) of the plane. In the finite element software, define these constraints to ensure that the model has stable boundary conditions during calculation.

[0070] It can be understood that the appropriate solver type is selected, the solving precision, the number of iterations, and other parameters are set to ensure the convergence of the calculation, and the solving process is started. The finite element analysis software will perform finite element analysis according to the set load and boundary conditions, and calculate the stress, strain and deformation.

[0071] Specifically, the extraction method of the radial deformation is as follows: first, after the solution is completed, enter the result viewing module, then select the corresponding node or node set at the position where the 200N radial force is applied (i.e. corresponding to the angular position), and finally view and extract the radial deformation (usually displacement value) of the selected corresponding angular position. In most finite element analysis software, the displacement in a specific direction can be extracted through the result browser or query function.

[0072] Further, taking ANSYS as an example. First, use ANSYS DesignModeler to create a geometric model of the piston ring, and use Mesh Tool to divide the model into meshes. Second, define material properties in ANSYS Engineering Data and assign them to the geometric model. Then, in ANSYS Mechanical, use Loads function to apply a radial force of 200N. Use Supports function to constrain three degrees of freedom in the vertical plane. Next, select an appropriate solver (such as Static Structural), set the solving parameters and run the solution. Finally, after the solution is completed, enter the result viewing module (Results). Use the Probe function to select the node at the force application position, and extract the radial deformation of the node.

[0073] Further, taking ABAQUS as an example, first, a geometric model of the piston ring is created using ABAQUS / CAE. The model is meshed using the Mesh module. Second, material properties are defined in the Property module and assigned to the geometric model. Then, in the Load module, a Step is created and a radial force of 200 N is applied. Boundary conditions are created, and three degrees of freedom are constrained on the vertical plane. Finally, a Job is created, submitted, and run for solving. In the Visualization module, the solution result file (.odb) is opened. The Query Tool is used to select the node where the force is applied, and the radial deformation of that node is extracted.

[0074] It can be understood that through the above steps, the radial deformation at the corresponding angle position can be extracted after the 200 N radial force is applied in the finite element analysis. These radial deformation data can be used for further analysis and design optimization.

[0075] Specifically, the specific steps for calculating the stiffness value at each angle position are as follows: for each angle position (such as 0°, 1°, 2°,..., 360°), the corresponding radial deformation δ is extracted, and the corresponding stiffness value k is calculated using the extracted radial deformation δ.

[0076] It can be understood that the steps of constructing the fitting function are as follows: first, collect the stiffness values and corresponding axial height data at each angle position within the range of 0° to 45° and 315° to 360°. Second, select an appropriate fitting model. Then, use the tools in the 'numpy' (a basic library for efficient processing of multi-dimensional arrays and matrices, providing powerful array operations and linear algebra functions) and'scipy' (an extension library based on NumPy, providing more advanced functions for scientific computing, such as optimization, integration, signal processing, and statistics) libraries to perform fitting. Verify the quality of the fitting function. Finally, through the fitting function, the height of the protruding structure 11 at any angle position within the range of 0° to 45° and 315° to 360° can be calculated.

[0077] Specifically, the first angle is 45°, and the second angle is 315°. During the operation of the piston ring, there is a certain gap 201 between the piston ring and the piston ring groove 200, especially near the notch 101 of the ring body 10. In order to further utilize this gap 201, the protruding structure 11 is arranged between 315° to 360° and 0° to 45°, which can allow gas to enter the gap 201 and maintain a lower pressure outside the ring groove, reducing the risk of radial contraction and collapse of the piston ring under high pressure difference.

[0078] Further, the protruding structure 11 can be arranged between 330° to 360° and 0° to 30°.

[0079] The following data table 1 is obtained by comparing the 45° included angle of Example 1 with the 30° included angle of Example 2:

[0080]

[0081] In addition, the raised structure 11 arranged between 315° and 360° and 0° and 45° has better sealing effect, because it covers a larger area, effectively reduces gas leakage, has fewer gap 201 channels, and reduces gas permeation. The raised structure 11 arranged between 330° and 360° and 0° and 30° has relatively weak sealing effect, covers a smaller area, has a slightly higher risk of gas leakage, has more gap 201 channels, and has more gas permeation. From the perspective of stiffness change, the raised structure 11 arranged between 315° and 360° and 0° and 45° has a more significant increase in stiffness, because it covers a larger gap 101 area, effectively enhancing the structural strength of the gap 101 area; the raised structure 11 arranged between 330° and 360° and 0° and 30° has a less increase in stiffness, because it covers a smaller gap 101 area, and the structural strength is enhanced to a limited extent. From the perspective of wear resistance, the raised structure 11 arranged between 315° and 360° and 0° and 45° reduces the friction and wear between the ring groove and the piston ring due to the increase in stiffness and improvement in sealing performance; the raised structure 11 arranged between 330° and 360° and 0° and 30° has a less increase in stiffness and improvement in sealing performance, and the friction and wear are reduced to a limited extent. In summary, the raised structure 11 arranged between 315° and 360° and 0° and 45° has a larger reduction in external pressure, better sealing effect, and a significant increase in stiffness and wear resistance, and is suitable for use in engines with high performance and high sealing requirements. The raised structure 11 arranged between 330° and 360° and 0° and 30° has a smaller reduction in external pressure, weaker sealing effect, and limited increase in stiffness and wear resistance, and is suitable for use in engines with general performance requirements. In summary, the selection of the position of the raised structure 11 needs to consider factors such as the reduction in external pressure, sealing effect, stiffness, and wear resistance. Arranging the raised structure 11 between 315° and 360° and 0° and 45° can provide better sealing and stiffness improvement effect, but in some cases, arranging the raised structure 11 between 330° and 360° and 0° and 30° can also meet the needs of specific applications.

[0082] Further, the following data table 2 is obtained by comparing Comparative Example 1 with Example 1:

[0083]

[0084] To prove the superiority of the protruding structure 11 arranged between 315° and 360° and 0° and 45° in the technical scheme of the present application, we can arrange the protruding structure 11 between 225° and 315° as a comparative example to compare the technical effects. In terms of sealing performance, the protruding structure 11 arranged between 315° and 360° and 0° and 45° has a significantly improved sealing effect, covering the gap 101 area and its vicinity, effectively reducing gas leakage. The gap 201 channel is reduced, and the gas permeation is reduced. The protruding structure 11 arranged between 225° and 315° has a relatively weak sealing effect, covering an area far from the gap 101, and has a high risk of gas leakage. The gap 201 channel is more, and the gas permeation is more. In terms of rigidity, the protruding structure 11 arranged between 315° and 360° and 0° and 45° has a significantly improved rigidity, enhancing the structural strength of the gap 101 area. The protruding structure 11 arranged between 225° and 315° has a limited rigidity improvement, because the covered area is far from the gap 101, and the structural strength enhancement effect is small. In terms of wear resistance, the protruding structure 11 arranged between 315° and 360° and 0° and 45° has increased rigidity and improved sealing performance, reducing the friction and wear between the ring groove and the piston ring. The protruding structure 11 arranged between 225° and 315° has less rigidity increase and sealing performance improvement, and the friction and wear reduction is limited. From the perspective of reducing the internal and external pressure difference, the protruding structure 11 arranged between 315° and 360° and 0° and 45° significantly reduces the external pressure and significantly improves the sealing effect. The protruding structure 11 arranged between 225° and 315° has a limited effect on reducing the external pressure and a poor sealing effect. In summary, the protruding structure 11 arranged between 315° and 360° and 0° and 45° can significantly reduce the external pressure, significantly improve the rigidity, and significantly improve the wear resistance. In comparison, the protruding structure 11 arranged between 225° and 315° has a poor effect, cannot significantly improve the sealing performance and rigidity, and has a limited wear resistance improvement. Therefore, the technical scheme of the present embodiment has a significant superiority in reducing the external pressure, improving the rigidity, and improving the wear resistance.

[0085] It can be understood that the height of the piston ring of the existing small engine is between 1 mm and 2 mm, the height of the piston ring of the automobile engine is between 1.2 mm and 2.5 mm, and the height of the heavy diesel engine is between 2.5 mm and 4.5 mm.

[0086] Specifically, the fitting function is wherein k is the stiffness value at angle θ, h is the axial height of the protrusion structure 11 at angle θ, a and b are fitting parameters obtained from experiments, a is the first fitting parameter, and b is the second fitting parameter. By experiments or simulations, the stiffness value k of the piston ring and the corresponding axial height of the protrusion structure 11 at different angles θ are measured, for example, the stiffness and height can be measured at several angular positions (such as every 5°) in the range of 0° to 45° or 315° to 360°, and linear regression is performed using these data to fit the linear model wherein a is the slope of the linear regression, indicating the influence of the change in axial height on the change in stiffness, and a larger a value means that the height has a greater influence on the stiffness. b is the intercept of the linear regression, indicating the theoretical stiffness value when the height is zero, and b generally reflects the basic contribution of other factors to the stiffness.

[0087] The specific embodiment provides a piston ring, and the following first experimental data is obtained:

[0088]

[0089] The following is the second experimental data:

[0090]

[0091] According to the above first experimental data and second experimental data, a and b can be calculated, wherein a can be 100, and b can be 100. It should be noted that a and b are not fixed, but are measured at different positions of different ring bodies 10, and further brought into the fitting function to simulate whether the experiment is correct. When the height of the protrusion structure 11 is 0, it means that the height of the piston ring is the height of the ring body 10,

[0092] In some embodiments, a storage medium is further included, and the storage medium is used to store the above preparation method. The storage medium can include a computer readable medium, a mobile storage device, and a cloud storage.

[0093] In some embodiments, a computer workstation is further included, which can retrieve the preparation method from the storage medium, and then drive the processing equipment according to the program.

[0094] The processing equipment can include a numerical control lathe for precision turning to form the basic shape and size of the piston ring. A numerical control milling machine for machining complex geometric structures and details. A grinding machine for precision grinding to ensure the surface finish and dimensional accuracy of the piston ring. A laser cutting machine for precision cutting and trimming.

[0095] The processing equipment can also be a metal printer for manufacturing complex-shaped piston rings. Or a laser melting 3D printer for high-precision metal additive manufacturing.

[0096] Further, the present embodiment also provides an automated and intelligent control device, including the above-mentioned computer workstation, which includes an automated production line integrating numerical control machining equipment, robots and conveying systems to realize the automated production of piston rings. A real-time monitoring system is used to monitor key parameters (such as temperature, pressure, size, etc.) during the production process to ensure product quality. An intelligent control system uses machine learning and artificial intelligence technology to optimize the production process and quality control.

[0097] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements easily thought of by those skilled in the art within the technical scope disclosed by the present application shall be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of manufacturing a piston ring, the piston ring including a ring body having a notch in a circumferential direction, the ring body having an upper side for disposition facing an upper side of a piston ring groove in an axial direction of the ring body, the upper side being provided with a protruding structure on both sides of the notch, characterized in that, The method for manufacturing the piston ring comprises the following steps: providing the ring body, setting the middle position of the notch of the ring body as 0° along the circumference of the ring body, and calculating the stiffness value of the ring body at each angle position between 0° and 360°; calculating the average stiffness value according to the stiffness value between the first angle and the second angle away from the notch; constructing a fitting function; calculating the size of the convex structure along the axial direction of the ring body at each angle position according to the average stiffness value and the fitting function; setting the convex structure on the upper side of the ring body at both sides of the notch.

2. The method of manufacturing a piston ring according to claim 1, characterized in that, The step of calculating the stiffness value at each angle position comprises: establishing a finite element model of the piston ring, and dividing the piston ring into 360 parts according to the angle, which are respectively corresponding to each angle between 0° and 360°; applying a radial force F=200N at each angle position, and restricting the freedom perpendicular to the plane of the position; extracting the radial deformation amount of the corresponding angle position after applying the radial force F=200N; The stiffness value at each angular position is calculated according to the formula k = — δ where k is the stiffness value at each angle and δ is the radial deformation.

3. The method of manufacturing a piston ring according to claim 1, wherein the first angle is 45°, and the second angle is 315°.

4. The method of manufacturing a piston ring according to claim 1, wherein The fit function is where k is the stiffness value at angle θ, h is the axial height of the protrusion structure at angle θ, a is a first fit parameter, and b is a second fit parameter.

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