Hypoid gear error evaluation method, system, terminal and medium

Abstract

The present invention relates to the field of hypoid gear manufacturing, and specifically discloses a hypoid gear error evaluation method, system, terminal, and medium. First, the normal deviation of each grid point on the gear tooth surface is obtained, and then the theoretical coordinates and normal vectors are calculated. Based on the normal deviation, the theoretical coordinates, and the normal vectors, the real coordinates are obtained. Then, a real hypoid gear model containing tooth profile error can be constructed. The contact mark of the real hypoid gear model is extracted and compared with the contact mark of the theoretical hypoid gear model to obtain the influence of the tooth profile error on the contact mark. Then, it can be judged whether the tooth profile error is qualified. If it is unqualified, it affects the adjustment accuracy, and the tooth profile should be processed to avoid long adjustment time. The present invention can quickly and conveniently obtain the influence of tooth profile error on gears to assist debugging and shorten adjustment time.

Description

Technical Field

[0001] The present invention relates to the field of hypoid gear manufacturing, and in particular to a hypoid gear error evaluation method, system, terminal and medium. Background Art

[0002] Hypoid gears, a key component for power transmission between intersecting shafts, are widely used in automobiles, ships, electric power, the petroleum and metallurgical industries, lifting machinery, and industrial reducers. They boast high load capacity, long fatigue life, and high reliability, thus playing a crucial role in the modern machinery manufacturing industry. However, the geometric topology and manufacturing process of hypoid gears are extremely complex, and their meshing performance is highly sensitive to systematic and random errors in machining, making it extremely difficult to maintain consistency between the tooth surface and physical properties during design and manufacturing.

[0003] Currently, in the production process of hypoid gears, fitters verify the tolerance of gear design and manufacturing accuracy by testing the deviation of the shape and position of the designed contact mark. However, due to the inability to accurately analyze the source of the error, they can only qualitatively optimize the contact performance by adding or removing shims. The fitting process is long and the accuracy is low. In particular, it is impossible to quantitatively evaluate the gear tooth profile error. When there is a large continuous error, it is difficult to compensate for the error by simply adding shims, which brings great inconvenience to the fitting process. Summary of the Invention

[0004] To solve the above problems, the present invention provides a hypoid gear error evaluation method, system, terminal and medium, which can quickly and conveniently obtain the impact of tooth profile error on gears to assist debugging and shorten installation time.

[0005] In a first aspect, the technical solution of the present invention provides a hypoid gear error evaluation method, comprising the following steps:

[0006] Use a three-dimensional coordinate measuring machine to measure the gear tooth surface grid points point by point to obtain the normal deviation corresponding to each point;

[0007] Calculate the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system;

[0008] Calculate the coordinates of the actual tooth surface grid points based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector;

[0009] Construct a real hypoid gear model based on the real tooth surface grid point coordinates;

[0010] Extract the tooth surface contact mark of the real hypoid gear model and record it as the first contact mark;

[0011] Construct a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates;

[0012] Extract the surface contact mark of the theoretical hypoid gear model and record it as the second contact mark;

[0013] Compare the first contact imprint and the second contact imprint to obtain the tooth profile error influence result;

[0014] Determine whether the tooth profile error influence result is within the preset range. If so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

[0015] In an optional embodiment, the actual tooth surface grid point coordinates are calculated based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector, specifically including:

[0016] The normal deviation of the tooth surface grid points is expressed in matrix form:

[0017]

[0018] in, E cave is the gear concave surface normal deviation matrix, E vex is the gear convex surface normal deviation matrix;

[0019] The theoretical tooth surface grid point coordinates include the theoretical concave surface grid point coordinate matrix of the gear R ot and the theoretical convex grid point coordinate matrix R tt ;

[0020] Theoretical tooth surface grid point normal vector includes the theoretical concave surface grid point normal vector matrix of the gear N ot and the theoretical convex grid point normal matrix N tt ;

[0021] The real tooth surface grid point coordinates are calculated using the following formula:

[0022]

[0023]

[0024] in, R or is the real concave mesh point coordinate matrix of the gear, R tr is the coordinate matrix of the real convex mesh points of the gear.

[0025] In an optional embodiment, after constructing the real hypoid gear model according to the real tooth surface grid point coordinates and constructing the theoretical hypoid gear model according to the theoretical tooth surface grid point coordinates, the following steps are further included:

[0026] Perform hexahedral meshing on the large and small wheels;

[0027] Define the elastic modulus and Poisson's ratio of the large and small wheels;

[0028] Couple the tooth bottoms of the large and small wheels, and constrain the load and displacement through control points;

[0029] Perform interference processing on the tooth surfaces of the large wheel and the small wheel to ensure normal meshing between the large wheel and the small wheel;

[0030] The stiffness matrices of the large and small wheels are calculated and assembled, and the stress and strain balance are solved through partial differential equations.

[0031] In an optional embodiment, comparing the first contact mark and the second contact mark to obtain the tooth profile error influence result specifically includes:

[0032] Calculate the distance between the first contact mark and the edge of the tooth surface, which is recorded as the first distance;

[0033] Calculate the distance between the second contact mark and the edge of the tooth surface, and record it as the second distance;

[0034] The difference between the first distance and the second distance is calculated and recorded as the contact mark deviation, that is, the tooth profile error affects the result.

[0035] In an optional embodiment, the distance between the contact mark and the edge of the tooth surface includes the minimum spatial distance between the concave contact mark and the large end. L o1 , Minimum space distance from tooth top L o2 , minimum space distance from the little end L o3 , Minimum space distance from tooth root L o4 , and the minimum spatial distance between the convex contact mark and the large end L t1 , Minimum space distance from tooth top L t2 , minimum space distance from the little end L t3 , Minimum space distance from tooth root L t4 ;

[0036] The contact mark deviation includes the sum of the contact mark big end deviation, tooth top deviation, small end deviation and tooth root deviation of the concave surface, and the sum of the contact mark big end deviation, tooth top deviation, small end deviation and tooth root deviation of the convex surface.

[0037] In an optional embodiment, each deviation is the absolute value of the difference between the corresponding two distances.

[0038] In a second aspect, the technical solution of the present invention provides a hypoid gear error evaluation system, comprising:

[0039] Grid point normal deviation acquisition module: obtains the normal deviation corresponding to each point by measuring the gear tooth surface grid points point by point using a three-dimensional coordinate measuring machine;

[0040] Theoretical coordinate calculation module: calculates the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system;

[0041] Real coordinate calculation module: calculates the real tooth surface grid point coordinates based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector;

[0042] Real model construction module: Constructs a real hypoid gear model based on the real tooth surface grid point coordinates;

[0043] First contact mark extraction module: extracts the tooth surface contact mark of the real hypoid gear model, which is recorded as the first contact mark;

[0044] Theoretical model construction module: Constructs a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates;

[0045] Second contact mark extraction module: extracts the surface contact mark of the theoretical hypoid gear model, which is recorded as the second contact mark;

[0046] Contact mark deviation acquisition module: compares the first contact mark and the second contact mark to obtain the tooth profile error impact result;

[0047] Tooth profile error evaluation module: determines whether the tooth profile error impact result is within the preset range. If so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

[0048] In a third aspect, the technical solution of the present invention provides a terminal, including:

[0049] a memory for storing a hypoid gear error evaluation program;

[0050] A processor is configured to implement the steps of any of the above-mentioned hypoid gear error evaluation methods when executing the hypoid gear error evaluation program.

[0051] In a fourth aspect, the technical solution of the present invention provides a computer-readable storage medium, on which a quasi-hypoid gear error evaluation program is stored. When the quasi-hypoid gear error evaluation program is executed by a processor, the steps of the quasi-hypoid gear error evaluation method as described in any one of the above items are implemented.

[0052] The present invention provides a hypoid gear error evaluation method, system, terminal, and storage medium, which have the following advantages over existing technologies: first, the normal deviation of each grid point on the gear tooth surface is obtained, and then the theoretical coordinates and normal vectors are calculated. Based on the normal deviation, theoretical coordinates, and normal vectors, the real coordinates are obtained. Then, a real hypoid gear model containing tooth profile error can be constructed. The contact print of the real hypoid gear model is extracted and compared with the contact print of the theoretical hypoid gear model to obtain the impact of the tooth profile error on the contact print. Then, it can be determined whether the tooth profile error is qualified. If it is unqualified, it will affect the adjustment accuracy, and the tooth profile should be processed to avoid long adjustment time. The present invention can quickly and conveniently obtain the impact of tooth profile error on gears, thereby assisting in debugging and shortening adjustment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 The figure is a flow chart of a hypoid gear error evaluation method provided by an embodiment of the present invention.

[0055] Figure 2 It is a schematic diagram of the normal deviation between the real tooth surface and the theoretical tooth surface.

[0056] Figure 3 Schematic diagram of the distance between the contact mark and the edge of the tooth surface.

[0057] Figure 4 The present invention provides a schematic block diagram of a hypoid gear error evaluation system.

[0058] Figure 5 It is a structural diagram of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0061] Figure 1 This is a flowchart of a hypoid gear error evaluation method provided in an embodiment of the present invention. According to different requirements, the order of the steps in the flowchart can be changed, and some can be omitted.

[0062] like Figure 1 Said method comprises the following steps.

[0063] S1, use a three-dimensional coordinate measuring machine to measure the tooth surface grid points of the gear point by point to obtain the normal deviation corresponding to each point.

[0064] The purpose of this step is to obtain the normal deviation of the tooth surface mesh points.

[0065] In specific implementation, after the tooth surface measurement is accurately positioned, the tooth surface grid points are measured point by point using the CMM's built-in measurement program to obtain the tooth surface detection file. In the detection file, the normal deviation corresponding to each point is expressed in the form of a difference surface, thereby obtaining the normal deviation between the actual tooth surface and the theoretical tooth surface, such as Figure 2 shown.

[0066] In the design of spiral bevel gear tooth surfaces, the normal deviation is generally defined as the tooth surface error. To build a digital model of the actual tooth surface, the tooth surface error at each point can be stored in the form of a matrix.

[0067] Specifically, the normal deviation of the tooth surface grid points is expressed in matrix form:

[0068]

[0069] in, E cave is the gear concave surface normal deviation matrix, E vex is the gear convex surface normal deviation matrix.

[0070] It should be noted that the hypoid gear includes a large wheel and a small wheel, and the concave and convex normal deviations of the large wheel and the small wheel are obtained respectively.

[0071]

[0072] in, E Pcave is the small wheel concave tooth profile error matrix, E Pvex is the small wheel convex tooth profile error matrix; E Gcave is the large wheel concave tooth profile error matrix, E Gvex is the tooth profile error matrix of the large wheel crown.

[0073] S2, calculate the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system.

[0074] The purpose of this step is to obtain theoretical coordinate data. An optional implementation method is to obtain the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors based on the gear blank parameters, machine tool processing parameters and tool parameters according to the meshing equation and discrete equation.

[0075] Among them, the theoretical tooth surface grid point coordinates include the theoretical concave surface grid point coordinate matrix of the gear R ot and the theoretical convex grid point coordinate matrix R tt ; Theoretical tooth surface grid point normal vector includes the theoretical concave surface grid point normal vector matrix of the gear N ot and the theoretical convex grid point normal matrix N tt .

[0076] S3, calculate the real tooth surface grid point coordinates based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector.

[0077] Based on the normal deviation of each grid point obtained in step S1, the coordinates of the actual tooth surface are calculated using the theoretical coordinate data corresponding to each grid point in step S2:

[0078]

[0079]

[0080] in, R or is the real concave mesh point coordinate matrix of the gear, R tr is the coordinate matrix of the real convex mesh points of the gear.

[0081] S4, construct the real hypoid gear model according to the real tooth surface grid point coordinates.

[0082] In specific implementation, the CAD model of the hypoid gear is established through the real tooth surface point coordinates, and the assembly model of the hypoid gear pair is completed based on the mutual positional relationships such as the axis intersection angle, offset distance, and the distance from the pitch cone point to the intersection point.

[0083] It should be noted that after the model is built, it needs to be processed to extract the contact marks. Specifically, it includes:

[0084] Step 1, perform hexahedral mesh division on the large wheel and the small wheel;

[0085] Step 2, define the elastic modulus and Poisson's ratio of the large wheel and the small wheel;

[0086] Step 3: Couple the tooth bottoms of the large and small wheels and constrain the load and displacement through control points;

[0087] Step 4: Perform interference processing on the tooth surfaces of the large wheel and the small wheel so that the large wheel and the small wheel mesh normally;

[0088] Step 5, calculate and assemble the stiffness matrix of the large wheel and the small wheel, and balance and solve the stress and strain through partial differential equations.

[0089] S5, extracting the tooth surface contact mark of the real hypoid gear model, recorded as the first contact mark.

[0090] The purpose of this step is to extract the contact print based on stress and strain so as to compare the contact print deviation later.

[0091] S6, construct a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates.

[0092] S7, extract the surface contact mark of the theoretical hypoid gear model and record it as the second contact mark.

[0093] The construction of the model and the extraction of contact marks are similar to those of the real hypoid gear model and will not be repeated here.

[0094] S8, comparing the first contact mark and the second contact mark to obtain a tooth profile error influence result.

[0095] In this embodiment, the tooth profile error influences the result by comparing the distance between the contact mark and the tooth surface edge.

[0096] Specifically, the distance from the first contact mark to the edge of the tooth surface is calculated and recorded as the first distance; the distance from the second contact mark to the edge of the tooth surface is calculated and recorded as the second distance; the difference between the first distance and the second distance is calculated and recorded as the contact mark deviation, that is, the tooth profile error affects the result.

[0097] like Figure 3 As shown, in this embodiment, the distance between the contact mark and the edge of the tooth surface includes the minimum spatial distance between the concave contact mark and the large end. L o1 , Minimum space distance from tooth top L o2 , minimum space distance from the little end L o3 , Minimum space distance from tooth root L o4 , and the minimum spatial distance between the convex contact mark and the large end L t1 , Minimum space distance from tooth top L t2 , minimum space distance from the little end L t3 , Minimum space distance from tooth root L t4 .

[0098] The contact mark deviation includes the sum of the contact mark big end deviation, tooth top deviation, small end deviation and tooth root deviation of the concave surface, and the sum of the contact mark big end deviation, tooth top deviation, small end deviation and tooth root deviation of the convex surface.

[0099] Here, each deviation is the absolute value of the difference between the corresponding two distances.

[0100] Specifically, the contact print deviation is ,

[0101] in , is the large end deviation of the concave contact mark in the contact mark deviation, is the tooth top deviation of the concave contact mark in the contact mark deviation, is the small end deviation of the concave contact print in the contact print deviation, It is the tooth root deviation of the concave contact mark in the contact mark deviation.

[0102] , is the deviation of the convex contact mark at the large end of the contact mark deviation, is the contact mark deviation of the convex surface contact mark tooth top, is the small end deviation of the convex contact mark in the contact mark deviation, It is the tooth root deviation of the convex contact mark in the contact mark deviation.

[0103] S9, judging whether the tooth profile error influence result is within a preset range, if so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

[0104] It should be noted that, in order to determine whether the tooth profile error influence result is within the preset range, that is, to determine whether the contact mark deviation is within the preset range, in this embodiment, if the sum of the large end deviation, tooth top deviation, small end deviation and tooth root deviation of the concave contact mark is , the sum of the contact mark deviation of the convex surface, the deviation of the tooth top, the deviation of the small end, and the deviation of the tooth root , are all less than a certain value, indicating that the hypoid gear tooth profile error is qualified. The preset range can be determined according to the specific design.

[0105] It should be noted that when the tooth profile error is unqualified, it has a greater impact on the contact mark profile. In this case, it is necessary to adjust the tooth cutting or heat treatment process parameters, such as using thermal deformation error pre-compensation or heat treatment parameter optimization to achieve high-quality processing of the tooth surface.

[0106] During the specific implementation process, the error of the hypoid gear includes not only the tooth profile error but also the assembly error. Currently, the contact performance is optimized only by qualitatively adding or removing gaskets. In order to improve the debugging efficiency, this embodiment also analyzes the assembly error when the tooth profile error of the hypoid gear is qualified, which specifically includes the following steps.

[0107] SS1, obtain the contact mark of the actual gear assembly, recorded as the third contact mark.

[0108] It should be noted that the contact marks of actual assembly can be obtained by utilizing existing rolling inspection tests, etc., which will not be described in detail here.

[0109] SS2, calculate the distance from the third contact mark to the edge of the tooth surface, recorded as the third distance.

[0110] As mentioned above, the distance between the contact mark and the edge of the tooth surface includes the minimum spatial distance between the contact mark and the corresponding end surface.

[0111] SS3, calculate the difference between the first distance and the third distance, which is recorded as the second contact print deviation, that is, the assembly error affects the result.

[0112] The first distance is the corresponding distance of the contact mark extracted from the real hypoid gear model constructed with the tooth profile error considered. It should be noted that when extracting the first contact mark of the real hypoid gear model, the real hypoid gear model has no axial error.

[0113] SS4, determining whether the second contact mark deviation is within a preset deviation range.

[0114] SS5, if yes, the assembly error is qualified, otherwise the assembly error is unqualified.

[0115] Whether the assembly error is qualified is determined by comparing the contact mark of the actual assembly with the contact mark of the real hypoid gear model without axial error. If the two contact marks are basically consistent, it means that the assembly error of the actual assembly is qualified.

[0116] When the assembly error is unqualified, it is necessary to adjust the axial installation error of the large wheel and the small wheel, which is achieved by adding a gasket. In order to improve the debugging efficiency and match the gasket of appropriate thickness as soon as possible, this embodiment verifies the influence of gasket thickness on the contact mark by adjusting the axial error of the real quasi-hypoid gear model, and then matches the gasket of appropriate thickness, which specifically includes the following steps.

[0117] SS6, configure the small wheel axial installation error and the large wheel axial installation error according to the assembly error influence results.

[0118] SS7: Adjust the positions of the small and large wheels in the real hypoid gear model according to the configured axial installation error, and calculate the distance between the contact mark of the real hypoid gear model and the edge of the tooth surface in the current state, which is recorded as the fourth distance.

[0119] SS8, calculate the difference between the third distance and the fourth distance, and record it as the third contact print deviation.

[0120] SS9, determining whether the third contact mark deviation is within a preset deviation range.

[0121] SS10, if yes, the gasket is selected based on the currently configured axial installation error.

[0122] SS11, otherwise, reconfigure the small wheel axial installation error and the large wheel axial installation error, and continue to perform the steps after configuring the axial installation error.

[0123] First, configure the axial installation error based on the contact print deviation obtained in step SS3. This axial installation error can include the small wheel axial installation error and / or the large wheel axial installation error, determined based on the actual contact print deviation. The actual hypoid gear model is adjusted based on the axial installation error, and the contact print is extracted. If the resulting contact print is substantially consistent with the actual assembly contact print, the currently configured axial installation error can produce the actual assembly contact print. Shims selected based on this configured axial installation error can optimize gear assembly. If the two contact prints are inconsistent, reconfigure the axial installation error of the actual hypoid gear model and continue verification.

[0124] An embodiment of a hypoid gear error evaluation method is described in detail above. Based on the hypoid gear error evaluation method described in the above embodiment, an embodiment of the present invention further provides a hypoid gear error evaluation system corresponding to the method.

[0125] Figure 4 This is a schematic block diagram of the structure of a hypoid gear error evaluation system provided by an embodiment of the present invention. In this embodiment, the hypoid gear error evaluation system 400 can be divided into multiple functional modules according to the functions they perform. The module referred to in the present invention refers to a series of computer program segments that can be executed by at least one processor and can perform fixed functions, which are stored in the memory.

[0126] The grid point normal deviation acquisition module 401 is used to obtain the normal deviation corresponding to each point by measuring the grid points of the gear tooth surface point by point using a three-dimensional coordinate measuring machine.

[0127] Theoretical coordinate calculation module 402 calculates the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system.

[0128] The real coordinate calculation module 403 calculates the real tooth surface grid point coordinates based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector.

[0129] Real model building module 404: building a real hypoid gear model according to the real tooth surface grid point coordinates.

[0130] The first contact mark extraction module 405 extracts the tooth surface contact mark of the real hypoid gear model, which is recorded as the first contact mark.

[0131] Theoretical model construction module 406: constructs a theoretical hypoid gear model according to the theoretical tooth surface grid point coordinates.

[0132] The second contact mark extraction module 407 extracts the surface contact mark of the theoretical hypoid gear model, which is recorded as the second contact mark.

[0133] The contact mark deviation acquisition module 408 compares the first contact mark and the second contact mark to obtain the tooth profile error influence result.

[0134] The tooth profile error evaluation module 409 determines whether the tooth profile error influence result is within a preset range. If so, the hypoid gear tooth profile error is qualified; otherwise, it is unqualified.

[0135] In an optional embodiment, comparing the first contact mark and the second contact mark to obtain the tooth profile error influence result specifically includes:

[0136] Calculate the distance between the first contact mark and the edge of the tooth surface, which is recorded as the first distance;

[0137] Calculate the distance between the second contact mark and the edge of the tooth surface, and record it as the second distance;

[0138] The difference between the first distance and the second distance is calculated and recorded as the first contact mark deviation, that is, the tooth profile error affects the result.

[0139] Accordingly, it is determined whether the tooth profile error influence result is within the preset range, specifically:

[0140] It is determined whether the first contact mark deviation is within a preset deviation range.

[0141] In an optional embodiment, the system 400 further includes an assembly error acquisition module 410 , an assembly error evaluation module 411 , and an assembly error adjustment module 412 .

[0142] Assembly error acquisition module 410: obtains the contact mark of the actual gear assembly, recorded as the third contact mark; calculates the distance between the third contact mark and the edge of the tooth surface, recorded as the third distance; calculates the difference between the first distance and the third distance, recorded as the second contact mark deviation, that is, the assembly error impact result.

[0143] The assembly error evaluation module 411 determines whether the second contact mark deviation is within a preset deviation range; if so, the assembly error is qualified; otherwise, the assembly error is unqualified.

[0144] Assembly error adjustment module 412: configure the small wheel axial installation error and the large wheel axial installation error according to the assembly error influence result; adjust the small wheel and large wheel positions in the real hypoid gear model according to the configured axial installation error, calculate the distance between the contact mark of the real hypoid gear model and the tooth surface edge in the current state, and record it as the fourth distance; calculate the difference between the third distance and the fourth distance, and record it as the third contact mark deviation; determine whether the third contact mark deviation is within the preset deviation range; if so, select the gasket based on the currently configured axial installation error; otherwise, reconfigure the small wheel axial installation error and the large wheel axial installation error, and continue to execute the steps after configuring the axial installation error.

[0145] The hypoid gear error evaluation system of this embodiment is used to implement the aforementioned hypoid gear error evaluation method. Therefore, the specific implementation of the system can be seen in the embodiment section of the hypoid gear error evaluation method in the previous text. Therefore, its specific implementation can refer to the description of the corresponding embodiments of each part and will not be elaborated here.

[0146] In addition, since the hypoid gear error evaluation system of this embodiment is used to implement the aforementioned hypoid gear error evaluation method, its function corresponds to that of the aforementioned method and will not be described in detail here.

[0147] Figure 5A schematic diagram of the structure of a terminal 500 provided in an embodiment of the present invention includes: a processor 510, a memory 520, and a communication unit 530. The processor 510 is configured to implement the following steps when implementing the hypoid gear error evaluation program stored in the memory 520:

[0148] Use a three-dimensional coordinate measuring machine to measure the gear tooth surface grid points point by point to obtain the normal deviation corresponding to each point;

[0149] Calculate the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system;

[0150] Calculate the coordinates of the actual tooth surface grid points based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector;

[0151] Construct a real hypoid gear model based on the real tooth surface grid point coordinates;

[0152] Extract the tooth surface contact mark of the real hypoid gear model and record it as the first contact mark;

[0153] Construct a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates;

[0154] Extract the surface contact mark of the theoretical hypoid gear model and record it as the second contact mark;

[0155] Compare the first contact imprint and the second contact imprint to obtain the tooth profile error influence result;

[0156] Determine whether the tooth profile error influence result is within the preset range. If so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

[0157] The terminal 500 includes a processor 510, a memory 520, and a communication unit 530. These components communicate via one or more buses. Those skilled in the art will appreciate that the server structure shown in the figure does not limit the present invention; it may be a bus structure or a star structure, and may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0158] The memory 520 can be used to store execution instructions of the processor 510. The memory 520 can be implemented by any type of volatile or non-volatile storage terminal, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk. When the execution instructions in the memory 520 are executed by the processor 510, the terminal 500 can perform some or all of the steps in the above-described method embodiments.

[0159] The processor 510 is the control center of the storage terminal. It uses various interfaces and lines to connect various parts of the entire electronic terminal. It executes various functions of the electronic terminal and / or processes data by running or executing software programs and / or modules stored in the memory 520, and calling data stored in the memory. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 510 can only include a central processing unit (CPU). In the embodiment of the present invention, the CPU can be a single computing core or multiple computing cores.

[0160] The communication unit 530 is configured to establish a communication channel so that the storage terminal can communicate with other terminals, receive user data sent by other terminals, or send user data to other terminals.

[0161] The present invention also provides a computer storage medium, wherein the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0162] The computer storage medium stores a hypoid gear error evaluation program, which, when executed by a processor, implements the following steps:

[0163] Use a three-dimensional coordinate measuring machine to measure the gear tooth surface grid points point by point to obtain the normal deviation corresponding to each point;

[0164] Calculate the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system;

[0165] Calculate the coordinates of the actual tooth surface grid points based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector;

[0166] Construct a real hypoid gear model based on the real tooth surface grid point coordinates;

[0167] Extract the tooth surface contact mark of the real hypoid gear model and record it as the first contact mark;

[0168] Construct a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates;

[0169] Extract the surface contact mark of the theoretical hypoid gear model and record it as the second contact mark;

[0170] Compare the first contact imprint and the second contact imprint to obtain the tooth profile error influence result;

[0171] Determine whether the tooth profile error influence result is within the preset range. If so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

[0172] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus a necessary general-purpose hardware platform. Based on this understanding, the technical solutions in the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other media capable of storing program code, and includes instructions for causing a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention.

[0173] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0174] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0175] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0176] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by those skilled in the art, as well as several improvements and modifications made without departing from the principles of the present invention, should fall within the scope of protection of the present invention.

Claims

1. A hypoid gear error evaluation method, characterized in that: The following steps are involved: Use a three-dimensional coordinate measuring machine to measure the gear tooth surface grid points point by point to obtain the normal deviation corresponding to each point; Calculate the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system; Calculate the coordinates of the actual tooth surface grid points based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector; Construct a real hypoid gear model based on the real tooth surface grid point coordinates; Extract the tooth surface contact mark of the real hypoid gear model and record it as the first contact mark; Construct a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates; Extract the surface contact mark of the theoretical hypoid gear model and record it as the second contact mark; Compare the first contact imprint and the second contact imprint to obtain the tooth profile error influence result; Determine whether the tooth profile error influence result is within the preset range. If so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

2. The hypoid gear error evaluation method according to claim 1, characterized in that: The actual tooth surface grid point coordinates are calculated based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector, specifically including: The normal deviation of the tooth surface grid points is expressed in matrix form: in, E cave is the gear concave surface normal deviation matrix, E vex is the gear convex surface normal deviation matrix; The theoretical tooth surface grid point coordinates include the theoretical concave surface grid point coordinate matrix of the gear R ot and the theoretical convex grid point coordinate matrix R tt ; Theoretical tooth surface grid point normal vector includes the theoretical concave surface grid point normal vector matrix of the gear N ot and the theoretical convex grid point normal matrix N tt ; The real tooth surface grid point coordinates are calculated using the following formula: in, R or is the real concave mesh point coordinate matrix of the gear, R tr is the coordinate matrix of the real convex mesh points of the gear.

3. The hypoid gear error evaluation method according to claim 2, characterized in that: After constructing a real hypoid gear model based on the real tooth surface grid point coordinates and constructing a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates, the following steps are also included: Perform hexahedral meshing on the large and small wheels; Define the elastic modulus and Poisson's ratio of the large and small wheels; Couple the tooth bottoms of the large and small wheels, and constrain the load and displacement through control points; Perform interference processing on the tooth surfaces of the large wheel and the small wheel to ensure normal meshing between the large wheel and the small wheel; The stiffness matrices of the large and small wheels are calculated and assembled, and the stress and strain balance are solved through partial differential equations.

4. The hypoid gear error evaluation method according to claim 3, characterized in that: Compare the first contact mark and the second contact mark to obtain the tooth profile error impact results, including: Calculate the distance between the first contact mark and the edge of the tooth surface, which is recorded as the first distance; Calculate the distance between the second contact mark and the edge of the tooth surface, and record it as the second distance; Calculate the difference between the first distance and the second distance, which is recorded as the first contact mark deviation, that is, the tooth profile error affects the result; Determine whether the tooth profile error influence result is within the preset range, specifically: It is determined whether the first contact mark deviation is within a preset deviation range.

5. The hypoid gear error evaluation method according to claim 4, characterized in that: The distance between the contact mark and the edge of the tooth surface, including the minimum spatial distance between the concave contact mark and the large end L o1 , Minimum space distance from tooth top L o2 , minimum space distance from the little end L o3 , Minimum space distance from tooth root L o4 , and the minimum spatial distance between the convex contact mark and the large end L t1 , Minimum space distance from tooth top L t2 , minimum space distance from the little end L t3 , Minimum space distance from tooth root L t4 ; The contact mark deviation includes the sum of the contact mark big end deviation, tooth top deviation, small end deviation and tooth root deviation of the concave surface, and the sum of the contact mark big end deviation, tooth top deviation, small end deviation and tooth root deviation of the convex surface; Each deviation is the absolute value of the difference between the corresponding two distances.

6. The hypoid gear error evaluation method according to claim 5, characterized in that: When the hypoid gear tooth profile error is qualified, the following steps are also included: Obtain the contact mark of the actual gear assembly, which is recorded as the third contact mark; Calculate the distance from the third contact mark to the edge of the tooth surface, which is recorded as the third distance; Calculate the difference between the first distance and the third distance, which is recorded as the second contact print deviation, that is, the assembly error affects the result; determining whether the second contact mark deviation is within a preset deviation range; If yes, the assembly error is qualified, otherwise the assembly error is unqualified.

7. The hypoid gear error evaluation method according to claim 6, characterized in that: If the assembly error is unqualified, the following steps are also included: Configure the small wheel axial installation error and the large wheel axial installation error according to the assembly error influence result; Adjust the positions of the small wheel and the large wheel in the real hypoid gear model according to the configured axial installation error, and calculate the distance between the contact mark of the real hypoid gear model and the edge of the tooth surface in the current state, which is recorded as the fourth distance; Calculate the difference between the third distance and the fourth distance, and record it as the third contact print deviation; determining whether the third contact mark deviation is within a preset deviation range; If yes, select the gasket based on the currently configured axial installation error; Otherwise, reconfigure the small wheel axial installation error and the large wheel axial installation error, and continue to perform the steps after configuring the axial installation error.

8. A hypoid gear error evaluation system, characterized in that: include, Grid point normal deviation acquisition module: obtains the normal deviation corresponding to each point by measuring the gear tooth surface grid points point by point using a three-dimensional coordinate measuring machine; Theoretical coordinate calculation module: calculates the theoretical tooth surface grid point coordinates and theoretical tooth surface grid point normal vectors of the gear in the gear cutting coordinate system; Real coordinate calculation module: calculates the real tooth surface grid point coordinates based on the normal deviation of each point, the theoretical tooth surface grid point vector and the theoretical tooth surface normal vector; Real model construction module: Constructs a real hypoid gear model based on the real tooth surface grid point coordinates; First contact mark extraction module: extracts the tooth surface contact mark of the real hypoid gear model, which is recorded as the first contact mark; Theoretical model construction module: Constructs a theoretical hypoid gear model based on the theoretical tooth surface grid point coordinates; Second contact mark extraction module: extracts the surface contact mark of the theoretical hypoid gear model, which is recorded as the second contact mark; Contact mark deviation acquisition module: compares the first contact mark and the second contact mark to obtain the tooth profile error impact result; Tooth profile error evaluation module: determines whether the tooth profile error impact result is within the preset range. If so, the hypoid gear tooth profile error is qualified, otherwise it is unqualified.

9. The hypoid gear error evaluation system according to claim 8, characterized in that: Compare the first contact mark and the second contact mark to obtain the tooth profile error impact results, including: Calculate the distance between the first contact mark and the edge of the tooth surface, which is recorded as the first distance; Calculate the distance between the second contact mark and the edge of the tooth surface, and record it as the second distance; Calculate the difference between the first distance and the second distance, which is recorded as the first contact mark deviation, that is, the tooth profile error affects the result; Determine whether the tooth profile error influence result is within the preset range, specifically: It is determined whether the first contact mark deviation is within a preset deviation range.

10. The hypoid gear error evaluation system according to claim 9, wherein: Also includes, Assembly error acquisition module: obtains the contact mark of the actual gear assembly, recorded as the third contact mark; calculates the distance between the third contact mark and the edge of the tooth surface, recorded as the third distance; calculates the difference between the first distance and the third distance, recorded as the second contact mark deviation, that is, the assembly error impact result; Assembly error evaluation module: determines whether the second contact mark deviation is within a preset deviation range; if so, the assembly error is qualified; otherwise, the assembly error is unqualified; Assembly error adjustment module: Configure the pinion axial installation error and the large wheel axial installation error based on the assembly error impact results; adjust the pinion and large wheel positions in the real hypoid gear model based on the configured axial installation errors; calculate the distance between the contact mark of the real hypoid gear model in the current state and the tooth surface edge, recorded as the fourth distance; calculate the difference between the third distance and the fourth distance, recorded as the third contact mark deviation; Determine whether the third contact mark deviation is within the preset deviation range; if so, select the gasket based on the currently configured axial installation error; otherwise, reconfigure the small wheel axial installation error and the large wheel axial installation error, and continue to execute the steps after configuring the axial installation error.

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