A design method for involute gear tooth profile hob

Abstract

The present invention discloses a method for designing a hob for an involute gear tooth profile, including: obtaining parameter information of the gear to be processed, a target value for the tooth surface contact safety factor, and a target value for the tooth root bending safety factor; obtaining an estimated value for the heat treatment deformation and the maximum grinding allowance of the gear to be processed; determining the hob protrusion T of the hob based on the hob parameter information, where the hob protrusion T ≥ the minimum hob protrusion; inputting the hob parameter information into gear design software to obtain the actual value of the tooth surface contact safety factor and the actual value of the tooth root bending safety factor of the gear to be processed; and determining whether the hob design meets the requirements. This design method closely links the hob design with the gear to be processed by taking into account the hob design process, the product design, heat treatment process design, and machining process design of the gear to be processed, thereby ensuring the final quality of the gear to be processed through comprehensive planning and full-process control.

Description

Technical Field

[0001] The invention relates to the field of hob design methods, in particular to a hob design method for an involute gear tooth profile. Background Art

[0002] At present, the hob design methods for involute gears are mostly based on the user's gear parameters and process requirements, ensuring that after the gear is processed, its full tooth height and involute expansion length meet the design requirements.

[0003] However, although the methods in the existing technology have simple design verification and a short design cycle, they are unable to verify the final bending strength coefficient and contact strength coefficient of the gears processed by the hob. Basically, qualitative judgments still rely on the experience of technicians and lack quantitative judgment data.

[0004] Therefore, how to effectively improve the reliability of the hob design is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for designing a hob for an involute gear tooth profile, which is used to improve the product quality of the gear to be processed by the hob and improve the reliability of the hob design.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for designing an involute gear tooth profile hob comprises the following steps:

[0008] Step S1: Obtain parameter information of the gear to be processed, target value of the tooth surface contact safety factor, and target value of the tooth root bending safety factor;

[0009] Step S2: obtaining an estimated value of heat treatment deformation and a maximum grinding allowance of the gear to be processed, and determining a minimum hob protrusion of the hob according to the estimated value of heat treatment deformation and the maximum grinding allowance of the gear;

[0010] Step S3: Designing parameter information of the hob, wherein the parameter information of the hob includes pitch circle tooth thickness S, hob upper tooth height h, hob full tooth height H, hob protrusion height h1, protrusion angle δ, and tooth top transition arc R, and determining a hob protrusion amount T of the hob based on the parameter information of the hob, wherein the hob protrusion amount T is greater than or equal to the minimum hob protrusion amount;

[0011] Step S4: Inputting the parameter information of the hob into the gear design software, obtaining the actual value of the tooth surface contact safety factor and the actual value of the tooth root bending safety factor of the gear to be processed, and comparing the actual value of the tooth surface contact safety factor with the target value of the tooth surface contact safety factor, as well as the actual value of the tooth root bending safety factor with the target value of the tooth root bending safety factor;

[0012] Step S5: Based on the comparison results of the actual value of the tooth surface contact safety factor and the target value of the tooth surface contact safety factor, as well as the actual value of the tooth root bending safety factor and the target value of the tooth root bending safety factor, determine whether the design of the hob meets the requirements; if yes, terminate the hob design process; if not, optimize the parameter information of the gear to be processed, the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor, and repeat steps S1-S5.

[0013] Preferably, after step S2, the method further includes:

[0014] Step S2-1: using gear design software, obtaining a simulated value of the tooth surface contact safety factor and a simulated value of the tooth root bending safety factor according to the parameter information, the estimated value of the heat treatment deformation, and the maximum grinding allowance of the gear grinding;

[0015] Step S2-2: comparing the target value of the tooth surface contact safety factor and the simulated value of the tooth surface contact safety factor, and the target value of the tooth root bending safety factor and the target value of the tooth root bending safety factor.

[0016] Preferably, after step S2-2, the method further includes:

[0017] Step S2-3: adjusting the parameter information of the gear to be machined and the parameter information of the hob according to the comparison result, or reducing the target value of the tooth surface contact safety factor or the target value of the tooth root bending safety factor.

[0018] Preferably, in step S1, the parameter information of the gear to be processed includes the number of teeth, module, speed, power, material, heat treatment method, center distance of the gear pair and / or meshing relationship of the gear pair.

[0019] Preferably, step S3 includes:

[0020] Step S3-1: Design the hob pitch circle tooth thickness S, the hob upper tooth height h, and the hob full tooth height H of the hob, and input them into the gear design software to verify whether the full tooth height of the gear to be processed meets the requirements. If not, adjust the hob pitch circle tooth thickness S, the hob upper tooth height h, and the hob full tooth height H.

[0021] Preferably, the step S3 further includes:

[0022] Step S3 - 2 : Designing the hob protrusion height h1 and the hob protrusion angle δ of the hob, and determining the hob protrusion amount T, wherein the hob protrusion amount T is greater than or equal to the minimum hob protrusion amount.

[0023] Preferably, the step S3 further includes:

[0024] Step S3-3: Designing a hob tooth tip transition arc R of the hob, wherein the hob tooth tip transition arc R needs to be maximized.

[0025] Preferably, the step S3 further includes:

[0026] Step S3-4: iteratively calculate the hob cutter protrusion amount T, and repeat the steps S3-2 and 3-3 to finally determine the hob cutter protrusion amount T.

[0027] Preferably, the step S3 further includes:

[0028] Step S3-5: Input the parameter information of the hob into the gear design software for calculation to verify whether the involute starting circle diameter after hobbing and the involute starting circle diameter after grinding meet the requirements. If not, the parameter information of the hob needs to be further modified.

[0029] The method for designing an involute gear tooth profile hob provided by the present invention comprises the following steps: step S1: obtaining parameter information of a gear to be processed, a target value of a tooth surface contact safety factor, and a target value of a tooth root bending safety factor; step S2: obtaining an estimated value of heat treatment deformation and a maximum grinding allowance of the gear to be processed, and determining a minimum hob protrusion of the hob based on the estimated value of heat treatment deformation and the maximum grinding allowance of the gear; step S3: designing parameter information of the hob, the parameter information of the hob including pitch circle tooth thickness S, hob upper tooth height h, hob full tooth height H, hob protrusion height h1, protrusion angle δ, and tooth top transition arc R, and determining a hob protrusion T of the hob based on the parameter information of the hob, wherein the hob protrusion T is ≥ the minimum hob protrusion; step S4: The parameter information of the cutter is input into the gear design software to obtain the actual value of the tooth surface contact safety factor and the actual value of the tooth root bending safety factor of the gear to be processed, and the actual value of the tooth surface contact safety factor and the target value of the tooth surface contact safety factor are compared; step S5: according to the comparison results of the actual value of the tooth surface contact safety factor and the target value of the tooth surface contact safety factor and the actual value of the tooth root bending safety factor and the target value of the tooth root bending safety factor, it is judged whether the design of the hob meets the requirements; if yes, the hob design process is terminated; if not, the parameter information of the gear to be processed, the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor are optimized, and the steps S1-S5 are repeated. The method for designing a hob for an involute gear tooth profile integrates the design process of the hob with multiple links including the product design, heat treatment process design and machining process design of the gear to be processed. That is, in the parameter setting of the hob, the parameter information of the gear to be processed, the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor, as well as the estimated value of the heat treatment deformation and the maximum grinding allowance of the grinding gear are added as reference basis. The design of the hob is closely linked to the gear to be processed, and comprehensive planning and full-process control are carried out to ensure the final quality of the gear to be processed.

[0030] In a preferred embodiment, step S3 further includes: step S3-4: iteratively calculating the hob cutter protrusion amount T, and repeating steps S3-2 and 3-3 to ultimately determine the hob cutter protrusion amount T. The above process, by iteratively calculating the hob cutter protrusion amount T, ultimately obtains a hob cutter protrusion amount T that meets the estimated heat treatment deformation and the maximum grinding allowance requirement for gear grinding, thereby meeting the machining requirements of the gear to be machined. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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.

[0032] Figure 1 A flowchart of a specific implementation of the involute gear tooth profile hob design method provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the tooth profile of the hob in the involute gear tooth profile hob design method provided by the present invention. DETAILED DESCRIPTION

[0034] The core of the present invention is to provide a design method for an involute gear tooth profile hob, which can improve the final quality of the product and meet the bending strength and contact strength requirements of the gear system during meshing operation.

[0035] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] Please refer to Figure 1 and Figure 2 , Figure 1 A flowchart of a specific implementation of the involute gear tooth profile hob design method provided by the present invention; Figure 2 This is a schematic diagram of the tooth profile of the hob in the involute gear tooth profile hob design method provided by the present invention.

[0037] In this embodiment, the involute gear tooth profile hob design method includes the following steps:

[0038] Step S1: Obtain parameter information of the gear to be processed, target value of the tooth surface contact safety factor, and target value of the tooth root bending safety factor;

[0039] Step S2: obtaining an estimated value of heat treatment deformation and a maximum grinding allowance of the gear to be processed, and determining a minimum hob protrusion of the hob according to the estimated value of heat treatment deformation and the maximum grinding allowance of the gear;

[0040] Step S3: Designing parameter information of the hob, including pitch circle tooth thickness S, hob upper tooth height h, hob full tooth height H, hob protrusion height h1, protrusion angle δ, and tooth top transition arc R, and determining the hob protrusion amount T of the hob based on the hob parameter information, where the hob protrusion amount T ≥ the minimum hob protrusion amount;

[0041] Step S4: Inputting the parameter information of the hob into the gear design software, obtaining the actual value of the tooth surface contact safety factor and the actual value of the tooth root bending safety factor of the gear to be processed, and comparing the actual value of the tooth surface contact safety factor with the target value of the tooth surface contact safety factor, as well as the actual value of the tooth root bending safety factor with the target value of the tooth root bending safety factor;

[0042] Step S5: Based on the comparison results of the actual value of the tooth surface contact safety factor and the target value of the tooth surface contact safety factor, as well as the actual value of the tooth root bending safety factor and the target value of the tooth root bending safety factor, determine whether the design of the hob meets the requirements; if so, terminate the hob design process; if not, optimize the parameter information of the gear to be processed, the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor, and repeat steps S1-S5.

[0043] The involute gear tooth profile hob design method integrates the hob design process, the product design of the gear to be processed, the heat treatment process design and the machining process design, that is, in the parameter setting of the hob, the parameter information of the gear to be processed, the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor, as well as the heat treatment deformation estimation and the maximum grinding allowance of the grinding gear are added as reference basis, the hob design is closely linked to the gear to be processed, and comprehensive planning and full-process control are carried out to ensure the final quality of the gear to be processed.

[0044] In some embodiments, after step S2, the method further includes:

[0045] Step S2-1: Using gear design software, based on parameter information, estimated heat treatment deformation, and maximum grinding allowance, obtain simulated values ​​of the tooth surface contact safety factor and the tooth root bending safety factor;

[0046] Step S2-2: Compare the target value of the tooth contact safety factor with the simulated value of the tooth contact safety factor, as well as the target value of the tooth root bending safety factor and the target value of the tooth root bending safety factor. Specifically, the simulated value of the tooth contact safety factor and the simulated value of the tooth root bending safety factor are obtained by adding gear parameter information, heat treatment deformation estimation, and maximum grinding allowance, and can be used as a basis for evaluating whether the target value of the tooth contact safety factor and the target value of the tooth root bending safety factor are reasonable;

[0047] In some embodiments, after step S2-2, the method further includes:

[0048] Step S2-3: adjusting the parameter information of the gear to be processed and the parameter information of the hob according to the comparison result, or reducing the target value of the tooth surface contact safety factor or the target value of the tooth root bending safety factor.

[0049] Specifically, by comparing the target value of the tooth surface contact safety factor and the simulated value of the tooth surface contact safety factor, as well as the target value of the tooth root bending safety factor and the target value of the tooth root bending safety factor, it can be determined whether there is a large difference between the simulated value of the tooth surface contact safety factor and the simulated value of the tooth root bending safety factor and the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor after considering the parameter information of the gear and the estimated value of the heat treatment deformation and the maximum grinding allowance of the gear. When there is a large difference, on the one hand, the difference between the target value of the tooth surface contact safety factor and the simulated value of the tooth surface contact safety factor, as well as the target value of the tooth root bending safety factor and the target value of the tooth root bending safety factor can be reduced by designing the hob. If the hob design cannot change the difference, the difference can be reduced by changing the parameter information of the gear to be processed. For example, the hob can be optimized, the heat treatment power can be optimized, the module of the gear to be processed can be increased, etc. If none of the methods can change the large difference, the target value of the tooth surface contact safety factor or the target value of the tooth root bending safety factor should be reduced.

[0050] In some embodiments, in step S1, the parameter information of the gear to be processed includes the number of teeth, module, rotational speed, power, material, heat treatment method, center distance of the gear pair, and / or the meshing relationship of the gear pair. Specifically, the center distance of the gear pair refers to the center distance between the gear to be processed and its mating gear; the meshing relationship of the gear pair includes internal meshing or external meshing information.

[0051] In some embodiments, step S3 includes:

[0052] Step S3-1: Design the hob's pitch circle tooth thickness S, hob upper tooth height h, and hob full tooth height H. These are then input into the gear design software to verify whether the full tooth height of the gear being processed meets the requirements. If not, adjust the hob pitch circle tooth thickness S, hob upper tooth height h, and hob full tooth height H. Hob design incorporates verification of the full tooth height of the gear being processed. Hob parameters are adjusted to meet the processing requirements of the gear being processed. Alternatively, parameters that could not be optimized during hob design can be fed back into the parameter settings of the gear being processed, enabling feedback on the product and improving the final performance of the gear being processed.

[0053] In some embodiments, step S3 further includes:

[0054] Step S3-2: Design the hob protrusion height h1 and hob protrusion angle δ of the hob, and determine the hob protrusion amount T, where the hob protrusion amount T ≥ the minimum hob protrusion amount. Specifically, the minimum hob protrusion amount must meet the estimated value of heat treatment deformation and the maximum grinding allowance required for gear grinding.

[0055] In some embodiments, step S3 further includes:

[0056] Step S3-3: Design the hob tooth top transition arc R of the hob. The hob tooth top transition arc R needs to be maximized, that is, the hob tooth top transition arc R should take the maximum value within the required range. Since the larger the value of the hob tooth top transition arc R, the safer the gear is to use, the hob tooth top transition arc R is maximized.

[0057] In some embodiments, step S3 further includes:

[0058] Step S3-4: Iteratively calculate the hob protrusion T, and repeat steps S3-2 and 3-3 to finally determine the hob protrusion T. The above process, through iterative calculation of the hob protrusion T, ultimately determines the hob protrusion T that meets the estimated heat treatment deformation and the maximum grinding allowance requirements, thereby meeting the machining requirements of the gear to be machined.

[0059] Specifically, the hob protrusion amount T can be iteratively calculated by changing the hob protrusion height h1 or the hob tooth top transition arc R. For example, the hob protrusion amount T can be increased by increasing the hob protrusion height h1 or reducing the hob tooth top transition arc R to meet the needs of heat treatment deformation estimation and maximum grinding allowance of gear grinding. Specifically, when the hob protrusion height h1 is increased, the hob protrusion amount T will be increased accordingly. The increase in the hob protrusion amount T can meet the needs of heat treatment deformation estimation and maximum grinding allowance of gear grinding, but it will lead to a decrease in the hob tooth top transition arc R. The decrease in the hob tooth top transition arc R will lead to a decrease in the safety factor of the gear. Therefore, it is necessary to iteratively calculate the hob protrusion amount T to select the optimal parameter information of the hob.

[0060] In some embodiments, step S3 further includes:

[0061] Step S3-5: Input the hob parameter information into the gear design software for calculation to verify whether the involute starting circle diameter after hobbing and the involute starting circle diameter after grinding meet the requirements. If not, the hob parameter information needs to be further modified.

[0062] Specifically, the above steps are to obtain the optimal parameter information of the hob, input it into the gear design software for calculation, and verify whether the involute starting circle diameter after hobbing and the involute starting circle diameter after grinding meet the requirements, thereby serving as a basis for judging whether the parameter information of the hob is qualified.

[0063] Specifically, in a specific embodiment, the involute gear tooth profile hob design method includes the following steps:

[0064] Clarify the necessary conditions for hob design: the basic parameters of the gear to be machined and its mating gear, meshing relationship, speed, power, material, heat treatment method (tempering, carburizing and quenching required during design), etc., as well as the target values ​​of the tooth surface contact safety factor and the tooth root bending safety factor during gear pair design;

[0065] Collect process data: i.e. the grinding allowance of the gear to be processed, whether the process involves heat treatment, the type of heat treatment method, the estimated value of heat treatment deformation, and the maximum grinding allowance of the gear;

[0066] Input the gear parameters into the gear design software calculation program, and record the simulated values ​​of the tooth surface contact safety factor and the tooth root bending safety factor in the obtained results through simulation calculation. Compare them with the target values ​​of the tooth surface contact safety factor and the tooth root bending safety factor respectively to find the differences;

[0067] Design the hob indexing circle tooth thickness S, hob upper tooth height h, and hob full tooth height H of the hob, and bring them into the gear design software to verify the full tooth height of the gear to be processed;

[0068] Design the hob protrusion height h1 and hob protrusion angle δ of the hob, determine the hob protrusion amount T, and meet the maximum grinding allowance requirements of the process;

[0069] Design the hob tooth top transition arc R, based on the full arc of the hob tooth top, to maximize the processing;

[0070] Iteratively calculate the hob protrusion T, repeating the steps of: designing the hob protrusion height h1 and the hob protrusion angle δ of the hob, determining the hob protrusion T, meeting the maximum grinding allowance requirement of the process, and step: designing the hob tooth top transition arc R, based on the full arc of the hob tooth top, maximizing the processing; finally determining the hob protrusion T;

[0071] Calculate in the gear design software to verify the involute starting circle diameter after hobbing and the involute starting circle diameter after grinding;

[0072] Extract the actual value of the gear tooth surface contact safety factor and the actual value of the tooth root bending safety factor of the gear hob in the gear design software program, and verify the degree of conformity between the actual value of the gear tooth surface contact safety factor and the actual value of the tooth root bending safety factor and the designed target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor;

[0073] Based on the calculation results, it is determined whether the hob design meets the requirements. If it does, the hob design process is terminated. If it does not, it is fed back to the product design of the gear to be processed, the product design parameters are optimized, and the above steps are repeated to redesign the hob until it meets the requirements.

[0074] This involute gear tooth profile hob design method, through the design parameter collection → process data evaluation and process design and control → evaluation of differences between different calculation methods → hob structure design → geometric parameter evaluation after simulating the finished gear → final safety factor verification and adjustment, has the following advantages:

[0075] 1. The hob design process closely links the design of the gear parts to be processed, machining process design, heat treatment process design, machining production and heat treatment production, etc., with comprehensive planning and full control to ensure the final quality of the product.

[0076] 2. Transform the gear hob design from simply meeting the single requirements of the gear full tooth height, involute development length, etc. to meeting the requirements of the gear full tooth height, involute development length, hob tooth top transition arc, tooth surface contact safety factor, tooth root bending safety factor, and bending strength and contact strength during gear system meshing operation, so as to make a quantitative estimate and analysis of the final performance of the product.

[0077] The above is a detailed introduction to the involute gear tooth profile hob design method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be pointed out that, for those skilled in the art, several improvements and modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for designing an involute gear tooth profile hob, characterized in that: The following steps are involved: Step S1: Obtain parameter information of the gear to be processed, target value of the tooth surface contact safety factor, and target value of the tooth root bending safety factor; Step S2: obtaining an estimated value of heat treatment deformation and a maximum grinding allowance of the gear to be processed, and determining a minimum hob protrusion of the hob according to the estimated value of heat treatment deformation and the maximum grinding allowance of the gear; Step S3: Designing parameter information of the hob, wherein the parameter information of the hob includes pitch circle tooth thickness S, hob upper tooth height h, hob full tooth height H, hob protrusion height h1, protrusion angle δ, and tooth top transition arc R, and determining a hob protrusion amount T of the hob based on the parameter information of the hob, wherein the hob protrusion amount T is greater than or equal to the minimum hob protrusion amount; Step S4: Inputting the parameter information of the hob into the gear design software, obtaining the actual value of the tooth surface contact safety factor and the actual value of the tooth root bending safety factor of the gear to be processed, and comparing the actual value of the tooth surface contact safety factor with the target value of the tooth surface contact safety factor, as well as the actual value of the tooth root bending safety factor with the target value of the tooth root bending safety factor; Step S5: judging whether the design of the hob meets the requirements based on a comparison result of the actual value of the tooth surface contact safety factor and the target value of the tooth surface contact safety factor, and the actual value of the tooth root bending safety factor and the target value of the tooth root bending safety factor; If yes, the hob design process is terminated; if no, the parameter information of the gear to be machined, the target value of the tooth surface contact safety factor and the target value of the tooth root bending safety factor are optimized, and steps S1-S5 are repeated.

2. The method for designing an involute gear tooth profile hob according to claim 1, characterized in that: After step S2, the method further includes: Step S2-1: using gear design software, obtaining a simulated value of the tooth surface contact safety factor and a simulated value of the tooth root bending safety factor according to the parameter information, the estimated value of the heat treatment deformation, and the maximum grinding allowance of the gear grinding; Step S2-2: comparing the target value of the tooth surface contact safety factor and the simulated value of the tooth surface contact safety factor, and the target value of the tooth root bending safety factor and the target value of the tooth root bending safety factor.

3. The method for designing an involute gear tooth profile hob according to claim 2, characterized in that: After step S2-2, the method further includes: Step S2-3: adjusting the parameter information of the gear to be machined and the parameter information of the hob according to the comparison result, or reducing the target value of the tooth surface contact safety factor or the target value of the tooth root bending safety factor.

4. The method for designing an involute gear tooth profile hob according to claim 1, wherein: In step S1, the parameter information of the gear to be processed includes the number of teeth, module, speed, power, material, heat treatment method, center distance of the gear pair and / or meshing relationship of the gear pair.

5. The method for designing an involute gear tooth profile hob according to any one of claims 1 to 4, characterized in that: The step S3 comprises: Step S3-1: Design the hob pitch circle tooth thickness S, the hob upper tooth height h, and the hob full tooth height H of the hob, and input them into the gear design software to verify whether the full tooth height of the gear to be processed meets the requirements. If not, adjust the hob pitch circle tooth thickness S, the hob upper tooth height h, and the hob full tooth height H.

6. The method for designing an involute gear tooth profile hob according to claim 5, characterized in that: The step S3 further comprises: Step S3 - 2 : Designing the hob protrusion height h1 and the hob protrusion angle δ of the hob, and determining the hob protrusion amount T, wherein the hob protrusion amount T is greater than or equal to the minimum hob protrusion amount.

7. The method for designing an involute gear tooth profile hob according to claim 6, characterized in that: The step S3 further comprises: Step S3-3: Designing a hob tooth tip transition arc R of the hob, wherein the hob tooth tip transition arc R needs to be maximized.

8. The method for designing an involute gear tooth profile hob according to claim 7, wherein: The step S3 further comprises: Step S3 - 4 : Iteratively calculate the hob cutter protrusion amount T, and repeat the steps S3 - 2 and S3 - 3 to finally determine the hob cutter protrusion amount T.

9. The method for designing an involute gear tooth profile hob according to claim 7, wherein: The step S3 further comprises: Step S3-5: Input the parameter information of the hob into the gear design software for calculation to verify whether the involute starting circle diameter after hobbing and the involute starting circle diameter after grinding meet the requirements. If not, the parameter information of the hob needs to be further modified.

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