Face gear tooth surface modification grinding machining method based on dish-shaped grinding wheel

Abstract

The invention relates to the technical field of gear machining, in particular to a face gear tooth surface modification grinding machining method based on a dish-shaped grinding wheel, which comprises the following steps: determining face gear parameters, and calculating the minimum inner radius, the maximum outer radius, the face gear tooth bottom coordinate and the face gear tooth top coordinate of a face gear; discretizing the tooth surface of the face gear to obtain discrete tooth surface point coordinates of the face gear; shaping parameters are determined, and the shaping amount of each point of the face gear is calculated; combining the modification amount of each point of the face gear with the discrete tooth surface point coordinates of the face gear to obtain the modification amount corresponding to each discrete tooth surface point of the face gear; converting the motion compensation amount of each shaft of the machine tool required by each tooth surface point during linkage machining, determining a tooth grinding parameter, and obtaining a face gear grinding linkage machining code; calculating the motion compensation amount of each shaft of the machine tool, which needs to be added to each line of machining codes, to obtain a face gear tooth surface modification grinding machining code; the face gear machined through the method is stable in transmission, and the edge contact problem is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gear processing, and in particular to a gear tooth surface modification grinding method based on a dish-shaped grinding wheel. Background Art

[0002] Face gear transmission is a new type of gear transmission. Compared with spiral bevel gear transmission, face gear transmission has the advantages of small size, light weight, low noise, high interchangeability and strong load-bearing capacity. Face gear transmission has been applied to helicopters, Audi car central differentials, reducers and high-end machine tools and other equipment transmission systems abroad, and has achieved good results.

[0003] Face gear shaping is an important process in face gear manufacturing. Traditional non-shaped face gears often have edge contact in actual applications, which leads to stress concentration in gear tooth meshing, accelerates gear tooth fatigue damage, affects the transmission performance of the face gear, and cannot meet the transmission system's requirements for smooth face gear transmission and long service life. Summary of the invention

[0004] The purpose of the present invention is to provide a tooth surface modification grinding method for a face gear based on a dish-shaped grinding wheel, aiming to solve the problem of edge contact occurring in practical applications of the face gear.

[0005] To achieve the above object, the present invention provides a method for grinding and processing a tooth surface of a face gear based on a dish-shaped grinding wheel, comprising the following steps:

[0006] Determine the face gear parameters, and calculate the minimum inner radius, maximum outer radius, face gear tooth bottom coordinates, and face gear tooth top coordinates of the face gear;

[0007] Discrete the tooth surface of the face gear based on the radius of the face gear and the grinding wheel rotation angle to obtain the coordinates of the discrete tooth surface points of the face gear;

[0008] Determine the modification parameters and calculate the modification amount of each point of the face gear;

[0009] Combining the modification amount of each point of the face gear with the coordinates of the discrete tooth surface points of the face gear, forming an array of the two, and obtaining the modification amount corresponding to each discrete tooth surface point of the face gear;

[0010] Calculate the motion compensation of each axis of the machine tool required for each tooth surface point during linkage processing, determine the grinding parameters, and obtain the linkage processing code for face gear grinding;

[0011] Based on the face gear grinding linkage processing code, query the array, calculate the motion compensation amount of each axis of the machine tool required to be added for each row of processing code, and obtain the face gear tooth surface modification grinding processing code;

[0012] The face gear tooth surface modification grinding processing code is imported into the machine tool, the face gear workpiece and the grinding wheel are clamped and tool-set, and the processing program is run to realize the face gear tooth surface modification grinding processing.

[0013] The face gear parameters include but are not limited to module, number of teeth, transmission ratio, pressure angle, tooth height coefficient and displacement coefficient.

[0014] The shaping parameters include but are not limited to contact trace slope and shaping curve equation parameters.

[0015] Each row of the array contains modification information of a discrete tooth surface point of a face gear.

[0016] The gear grinding parameters include machine tool structure parameters, grinding wheel parameters and face gear parameters.

[0017] The present invention discloses a tooth surface modification grinding processing method for a face gear based on a dish-shaped grinding wheel, which comprises the following steps: determining face gear parameters, and calculating the minimum inner radius, maximum outer radius, face gear tooth bottom coordinates and face gear tooth top coordinates of the face gear; discretizing the face gear tooth surface based on the face gear radius and the grinding wheel rotation angle to obtain the discrete tooth surface point coordinates of the face gear; determining modification parameters, and calculating the modification amount of each point of the face gear; combining the modification amount of each point of the face gear with the discrete tooth surface point coordinates of the face gear, forming an array of the two, and obtaining the modification amount corresponding to each discrete tooth surface point of the face gear; converting the motion compensation amount of each axis of the machine tool required for each tooth surface point during linkage processing, determining the grinding parameters, and obtaining the face gear grinding linkage processing code; querying the array based on the face gear grinding linkage processing code, calculating the motion compensation amount of each axis of the machine tool required to be added for each row of processing code, and obtaining the face gear tooth surface modification grinding processing code; The grinding code is imported into the machine tool to complete the clamping and tool setting of the face gear workpiece and the grinding wheel, and the processing program is run to realize the tooth surface modification grinding processing of the face gear. This method is based on the special grinding processing program for face gears. Through the calculation and compensation of the movement amount of each axis of the machine tool, the processing control of different modification amounts of each tooth surface point of the face gear is realized. The face gear processed by this method has a smooth transmission and can greatly avoid the edge contact problem. This method upgrades the function of the original face gear grinding processing method without changing the original machine tool structure. It can realize the face gear modification processing of different modification parameters (contact track slope, modification curve equation parameters, etc.), and can obtain face gears with different contact tracks. There is no situation where the design result cannot be processed. The face gear modification grinding processing method provided by this method realizes the actual adjustable contact track of the face gear tooth surface, provides a good solution for optimizing the transmission performance of the face gear, and solves the edge contact problem in the actual application of the face gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0019] Figure 1 The present invention provides a flow chart of a method for grinding and processing tooth surface modification of a face gear based on a disc-shaped grinding wheel. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] See also Figure 1 The present invention provides a method for grinding and processing a tooth surface of a face gear based on a dish-shaped grinding wheel, comprising the following steps:

[0022] S1 determines the face gear parameters and calculates the minimum inner radius, maximum outer radius, face gear tooth bottom coordinates and face gear tooth top coordinates;

[0023] In the embodiment of the present invention, the basic parameters of the face gear, namely the face gear parameters, are determined according to the design requirements, including the module, the number of teeth, the transmission ratio, the pressure angle, the tooth height coefficient and the displacement coefficient. Based on the face gear parameters, the minimum inner radius R of the face gear is calculated. min , Maximum outer radius R max , tooth bottom coordinate Z d and tooth top coordinate Z a These calculations form the basis for subsequent steps, ensuring that the basic dimensions and shape of the face gears meet the design requirements.

[0024] S2 discretizes the tooth surface of the face gear based on the radius of the face gear and the grinding wheel angle to obtain the coordinates of the discrete tooth surface points of the face gear;

[0025] In the embodiment of the present invention, the tooth surface of the face gear is f and grinding wheel angle φ s Discretize and obtain the coordinates r of a series of discrete tooth surface points f (R f ,φ s ). This step is to convert the continuous tooth surface into a processable discrete point set to facilitate subsequent modification design and processing control.

[0026] S3 determines the modification parameters and calculates the modification amount of each point of the face gear;

[0027] In the embodiment of the present invention, the modification parameters, such as the contact track slope k, the modification curve equation parameters, etc., are determined according to the transmission characteristics and modification requirements of the face gear. Based on these parameters, the modification amount (Δx, Δy, Δz) of each discrete point of the face gear is calculated. The goal of the modification design is to optimize the tooth surface contact, reduce the vibration during meshing and meshing, and avoid edge contact.

[0028] S4 combines the modification amount of each point of the face gear with the coordinates of the discrete tooth surface points of the face gear, and forms an array of the two to obtain the modification amount corresponding to each discrete tooth surface point of the face gear;

[0029] In the embodiment of the present invention, the calculated modification amount of each point of the face gear (Δx, Δy, Δz) is compared with the discrete tooth surface point coordinates r of the face gear. f (R f ,φ s ) to form an array M(R f ,φ s ,Δx,Δy,Δz). This array contains the modification information of each discrete tooth surface point and is the key data for subsequent processing control.

[0030] S5 converts the motion compensation amount of each axis of the machine tool required for each tooth surface point during linkage processing, determines the gear grinding parameters, and obtains the face gear grinding linkage processing code;

[0031] In the embodiment of the present invention, since the machine tool coordinate system is different from the face gear coordinate system, it is necessary to convert the modification amount Δx, Δy, Δz) into the motion compensation amount (ΔX, ΔY, ΔZ) of each axis of the machine tool. According to the conversion relationship of the coordinate system, ΔX=Δz, ΔY=-Δy, ΔZ=Δx; determine the grinding parameters, including the machine tool structure parameters (spindle rotation radius R d ), grinding wheel parameters (grinding wheel radius R s , Virtual gear shaping cutter tooth tip circle radius R c ) and face gear parameters (transmission ratio i, face gear minimum inner radius R min , Maximum outer radius R max According to the machine tool structure parameters, grinding wheel parameters and face gear parameters, the linkage processing code for face gear grinding is generated. Each line of code corresponds to a different face gear radius R f and grinding wheel angle φ s .

[0032] S6, based on the face gear grinding linkage processing code, querying the array, calculating the motion compensation amount of each axis of the machine tool required to be added for each row of processing code, and obtaining the face gear tooth surface modification grinding processing code;

[0033] In the embodiment of the present invention, each line of the face gear grinding linkage processing code corresponds to a different face gear radius R f and grinding wheel angle φ s , by querying the array M(R f ,φ s ,Δx,Δy,Δz) can be used to calculate the motion compensation amount (ΔX,ΔY,ΔZ) of each axis of the machine tool that needs to be added for each line of processing code, and the face gear tooth surface modification grinding processing code can be obtained.

[0034] S7 imports the face gear tooth surface modification grinding processing code into the machine tool, completes the clamping and tool setting of the face gear workpiece and the grinding wheel, runs the processing program, and realizes the face gear tooth surface modification grinding processing.

[0035] In the embodiment of the present invention, the final face gear tooth surface modification grinding processing code is imported into the CNC machine tool to complete the clamping and tool setting of the face gear workpiece and the grinding wheel. When the processing program is run, the axes of the machine tool are linked according to the predetermined motion trajectory and compensation amount to realize the tooth surface modification grinding of the face gear.

[0036] After machining is completed, the gear surface is inspected to evaluate the modification effect. If necessary, the modification parameters or machining strategy are adjusted according to the inspection results, and iterative optimization is performed until the best transmission performance and surface quality are achieved.

[0037] This method uses the center of the tooth surface as the reference point, draws the contact trace of the face gear, and formulates a method for the modification function along the contact trace. This method can accurately calculate the modification amount of each point of the face gear, reduce the vibration of the face gear when meshing in and out, and effectively avoid edge contact; this method calculates the modification amount of each point of the face gear and converts it to obtain the motion compensation amount of each axis of the machine tool required for grinding each point of the face gear. This conversion method ensures that the modification amount can be accurately reflected in the motion control of the machine tool, and realizes the precise grinding of different modification amounts at each point of the face gear; the disc-shaped grinding wheel is used to simulate the rotation of the spur gear and perform linkage processing with the face gear workpiece. Through the linkage of the X, Y, Z, A, and B axes of the machine tool, the gradual development and grinding of the face gear tooth shape is realized. This linkage processing method ensures the processing accuracy; the face gear tooth surface is discretized according to the face gear radius and the grinding wheel rotation angle to obtain the coordinates of the discrete tooth surface points of the face gear. This discretization process provides basic data for subsequent modification design and machine tool motion compensation.

[0038] The above disclosure is only a preferred embodiment of a gear tooth surface modification grinding method based on a disc-shaped grinding wheel of the present invention. Of course, it cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A grinding method for modifying the tooth surface of a face gear based on a dish-shaped grinding wheel, characterized in that: The following steps are involved: Determine the face gear parameters, and calculate the minimum inner radius, maximum outer radius, face gear tooth bottom coordinates, and face gear tooth top coordinates of the face gear; Discrete the tooth surface of the face gear based on the radius of the face gear and the grinding wheel rotation angle to obtain the coordinates of the discrete tooth surface points of the face gear; Determine the modification parameters and calculate the modification amount of each point of the face gear; Combining the modification amount of each point of the face gear with the coordinates of the discrete tooth surface points of the face gear, forming an array of the two, and obtaining the modification amount corresponding to each discrete tooth surface point of the face gear; Calculate the motion compensation of each axis of the machine tool required for each tooth surface point during linkage processing, determine the grinding parameters, and obtain the linkage processing code for face gear grinding; Based on the face gear grinding linkage processing code, query the array, calculate the motion compensation amount of each axis of the machine tool required to be added for each row of processing code, and obtain the face gear tooth surface modification grinding processing code; The face gear tooth surface modification grinding processing code is imported into the machine tool, the face gear workpiece and the grinding wheel are clamped and tool-set, and the processing program is run to realize the face gear tooth surface modification grinding processing.

2. The tooth surface modification grinding method of a face gear based on a dish-shaped grinding wheel according to claim 1, It is characterized by: The face gear parameters include but are not limited to module, number of teeth, transmission ratio, pressure angle, tooth height coefficient and modification coefficient.

3. The tooth surface modification grinding method of a face gear based on a dish-shaped grinding wheel according to claim 1, characterized in that ； The shaping parameters include but are not limited to contact track slope and shaping curve equation parameters.

4. The method for grinding the tooth surface of a face gear based on a dish-shaped grinding wheel as claimed in claim 1, characterized in that ； Each row of the array contains modification information of a discrete tooth surface point of the face gear.

5. The method for grinding the tooth surface of a face gear based on a dish-shaped grinding wheel as claimed in claim 1, characterized in that ； The gear grinding parameters include machine tool structure parameters, grinding wheel parameters and face gear parameters.

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