On-machine detection method of special face gear grinding machine

Abstract

The invention relates to the technical field of gear detection, in particular to an on-machine detection method of a special face gear grinding machine, which comprises the following steps: based on a special numerical control gear grinding machine, installing hardware equipment of a measuring system below a grinding head component, including a swing arm unit and a measuring head unit, and completing wiring of the measuring system; function testing of swing-out and swing-in of the swing arm unit and signal input and output of the measuring head unit is carried out, and calibration of a measuring system coordinate system, the measuring head length, the measuring head eccentric value and the measuring radius is completed; setting a macro variable of a detection function on a machine based on a special numerical control gear grinding machine; developing an on-machine detection macro program and a detection interface based on a special numerical control gear grinding machine; on the basis of on-machine detection test of the special numerical control gear grinding machine, on-machine detection combined with the special face gear grinding machine is achieved, the face gear machining precision and machining efficiency are improved, the domestic special face gear grinding machine is perfected, secondary development including detection program and interface development is carried out on the basis of the Huazhong system, and the method is more intelligent.

Description

Technical Field

[0001] The present invention relates to the technical field of gear detection, and in particular to an in-machine detection method for a special face gear grinding machine. Background Technique

[0002] Face gear transmission is a new type of gear transmission form, which has the advantages of small volume, low noise, light weight and strong load-bearing capacity. Face gear transmission can be applied to fields such as aviation, aerospace, shipbuilding, automobiles, turntables and robot joints. Abroad, face gear transmission technology is applied in the Apache helicopter, which greatly improves the load-bearing capacity and reduces the volume, achieving good results.

[0003] There is a big gap between the processing technology of face gears in our country and that in foreign countries. The problems of low processing accuracy and low processing efficiency seriously restrict the popularization, application and mass production of face gears. In terms of gear detection, Xu Zhongsi of North University of China studied the application of two in-machine detection methods, namely the probe type and the scanning type, in the measurement of hypoid gears; Ding Zhiyao of Beihang University studied the detection path planning method for the tooth surface of face gears; Tang Jinyuan of Central South University studied the method of measuring face gears on a coordinate measuring machine; Lin Chao of Chongqing University proposed a measurement method and a probe adjustment method for in-machine detection of face gears; Li Guolong of Chongqing University proposed an in-machine detection method for face gears, which is a detection method for the worm grinding wheel grinding method.

[0004] At present, most of these detection methods stay at the theoretical stage, lack the combined application with special face gear grinding machines, and the specific implementation of the detection methods is not intelligent enough. Therefore, an in-machine detection method for a special face gear grinding machine is of great significance for improving the processing accuracy and efficiency of face gears and optimizing domestic special face gear grinding machines. Summary of the Invention

[0005] The purpose of the present invention is to provide an in-machine detection method for a special face gear grinding machine, aiming to solve the problems of improving the processing accuracy and efficiency of face gears.

[0006] To achieve the above purpose, the present invention provides an in-machine detection method for a special face gear grinding machine, including the following steps;

[0007] Based on a special CNC grinding machine, install the hardware equipment of the measurement system under the grinding head component, including a swing arm unit and a probe unit, and complete the wiring of the measurement system;

[0008] Conduct functional tests on the swing-out, swing-in of the swing arm unit and the signal input and output of the probe unit, and complete the calibration of the coordinate system of the measurement system, the probe length, the probe eccentricity value and the measurement radius;

[0009] Set macro variables for the detection function on the machine based on the special CNC grinding machine;

[0010] Development of the in - machine inspection macro program and inspection interface based on the dedicated CNC gear grinding machine;

[0011] Conduct in - machine inspection tests based on the dedicated CNC gear grinding machine.

[0012] Among them, the macro variables of the inspection function include face gear basic parameter macro variables, measurement input macro variables, measurement output macro variables, and face gear accuracy macro variables.

[0013] Among them, the face gear basic parameter macro variables include module, pressure angle, number of teeth of the virtual pinion, number of teeth of the face gear, addendum coefficient, clearance coefficient, tangential modification coefficient, height modification coefficient, outer radius of the face gear, and inner radius of the face gear. The measurement input macro variables include probe length, probe radius, X - axis coordinate of workpiece machining tool setting, Y - axis coordinate of workpiece machining tool setting, Z - axis coordinate of workpiece machining tool setting, and A - axis coordinate of workpiece machining tool setting. The measurement output macro variables include Z - direction coordinate of face gear tooth point, Y - direction coordinate of face gear tooth point, and Z - direction coordinate of face gear tooth point. The face gear accuracy macro variables include single pitch error of face gear, cumulative pitch error of face gear, tooth - to - tooth runout error of face gear, tooth thickness error of face gear, and tooth profile error of face gear.

[0014] Among them, the in - machine inspection macro program includes a safety movement program, a measurement movement program, a face gear pitch measurement program, and a face gear tooth point measurement program. The inspection interface includes measurement input parameters, current measurement point output coordinates, generation of pitch measurement program, generation of tooth point measurement program, and face gear accuracy calculation results.

[0015] Among them, the specific method of conducting in - machine inspection tests based on the dedicated CNC gear grinding machine:

[0016] After finishing the face gear grinding process, input the face gear basic parameters, measurement parameters, and each axis coordinates of tool setting for machining;

[0017] Generate and run the face gear pitch measurement program to calculate the single pitch error of face gear, cumulative pitch error of face gear, tooth - to - tooth runout error of face gear, and tooth thickness error of face gear;

[0018] Generate and run the face gear tooth point measurement program to calculate the tooth profile error of face gear;

[0019] Judge whether the face gear accuracy detected in - machine meets the requirements. If not, perform machining correction and inspection. If it meets the requirements, the machining is completed.

[0020] In-machine inspection method for a special face gear grinding machine of the present invention, based on a special numerical control grinding machine, the hardware equipment of the measurement system is installed below the grinding head component, including a swing arm unit and a probe unit, and the wiring of the measurement system is completed; functional tests of the swing-out, swing-in of the swing arm unit and the signal input and output of the probe unit are carried out, and the calibration of the coordinate system of the measurement system, the probe length, the eccentricity value of the side head, and the measurement radius is completed; macro variables for setting the inspection function are set in the machine based on the special numerical control grinding machine; macro programs and inspection interfaces for in-machine inspection are developed based on the special numerical control grinding machine; in-machine inspection tests are carried out based on the special numerical control grinding machine. This method realizes in-machine inspection combined with the special face gear grinding machine, improves the machining accuracy and efficiency of face gears, improves the domestic special face gear grinding machine, and has been re-developed based on the Huazhong system, including the development of inspection programs and interfaces, making it more intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the special face gear grinding machine provided by the present invention.

[0023] Figure 2 It is a schematic installation diagram of the measurement system of the special face gear grinding machine provided by the present invention.

[0024] Figure 3 It is a schematic diagram of the special in-machine inspection interface of the face gear grinding machine.

[0025] Figure 4 It is a flowchart of the in-machine inspection method for a special face gear grinding machine provided by the present invention.

[0026] Figure 5 It is a flowchart of the specific method for carrying out in-machine inspection tests based on the special numerical control grinding machine.

[0027] In the figure: 1 - workpiece component, 2 - dressing component, 3 - column component, 4 - bed, 5 - grinding head component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] Please refer to Figures 1 to 5 , the present invention provides an in - machine detection method for a special face - gear grinding machine, including the following steps;

[0030] S1 Based on a special numerical - control grinding machine, install the hardware devices of the measurement system under the grinding head component 5, including a swing - arm unit and a probe unit, and complete the wiring of the measurement system;

[0031] In an embodiment of the present invention, the special numerical - control grinding machine includes a workpiece component 1, a dressing component 2, a column component 3, a bed 4, and a grinding head component 5, as Figure 1 shown. Wherein the workpiece component 1 is used for clamping a face - gear workpiece and drives the face - gear workpiece to perform linear motion and rotational motion during in - machine detection; the dressing component 2 is equipped with a grinding - wheel dresser for dressing the tooth profile of the grinding wheel; the column component 3 can perform linear motion in two directions and rotational motion in one direction, and is used to drive the measurement system to perform linear motion in two directions during in - machine detection; the bed 4 is used for installing other structural components of the machine tool; the grinding head component 5 is used for installing a grinding - wheel spindle and the measurement system.

[0032] Based on the special numerical - control face - gear grinding machine, install the hardware devices of the measurement system under the grinding head component 5, as Figure 2 shown, including a swing - arm unit and a probe unit; complete the wiring of the measurement system, and the output signals of the probe unit include level signals and analog signals.

[0033] S2 Conduct functional tests on the swing - out, swing - in of the swing - arm unit and the signal input / output of the probe unit, and complete the calibration of the coordinate system of the measurement system, the probe length, the probe eccentricity value, and the measurement radius;

[0034] In an embodiment of the present invention, the tests of the basic functions of the measurement system include: the swing - out and swing - in tests of the swing - arm unit, the signal feedback test of the probe unit. Control the swing - arm unit and the probe signal through M - code and G - code respectively. Set the M - code as M147 in the numerical - control system. M147 controls the swing - out of the swing - arm unit. Confirm the swing - out state of the swing - arm unit before starting work. Based on the jump function of G - code G31L4 in the numerical - control system, control the probe to stop or output coordinate information when touched. Calibrate the radius and eccentricity value of the probe with the radius and coordinate system of a standard ball; establish a detection coordinate system based on the machine - tool coordinate system and the mechanical position of the probe system, and complete the calibration of the measurement system.

[0035] S3 sets macro variables for the in - machine setting detection function based on the dedicated CNC gear grinding machine;

[0036] In the embodiment of the present invention, the macro variables of the detection function include the basic parameter macro variables of the face gear, the measurement input macro variables, the measurement output macro variables, and the face gear precision macro variables. The basic parameter macro variables of the face gear include module, pressure angle, number of teeth of the virtual pinion, number of teeth of the face gear, addendum coefficient, clearance coefficient, tangential modification coefficient, height modification coefficient, outer radius of the face gear, and inner radius of the face gear. The measurement input macro variables include probe length, probe radius, workpiece machining tool setting X - axis coordinate, workpiece machining tool setting Y - axis coordinate, workpiece machining tool setting Z - axis coordinate, and workpiece machining tool setting A - axis coordinate. The measurement output macro variables include the Z - direction coordinate of the tooth point of the face gear, the Y - direction coordinate of the tooth point of the face gear, and the Z - direction coordinate of the tooth point of the face gear. The face gear precision macro variables include single pitch error of the face gear, cumulative pitch error of the face gear, tooth - circle run - out error of the face gear, tooth thickness error of the face gear, and tooth profile error of the face gear. As shown in Table 1, the macro variable setting of the dedicated in - machine detection part of the face gear grinding machine.

[0037] Table 1 Macro variables of the dedicated in - machine detection of the face gear grinding machine

[0038] Macro variable name Macro variable Module #51150 Pressure angle #51151 Number of teeth of the virtual pinion #51152 Number of teeth of the face gear #51153 Addendum coefficient #51154 Clearance coefficient #51155 Tangential modification coefficient #51156 Height modification coefficient #51157 Outer radius of the face gear #51158 Inner radius of the face gear #51159 X-axis coordinate for tool setting in machining #51160 Y-axis coordinate for tool setting in machining #51161 Z-axis coordinate for tool setting in machining #51162 A-axis coordinate for tool setting in machining #51163 Probe length #54600 Probe radius #54601 X-direction coordinate of the tooth surface point #54602 Y-direction coordinate of the tooth surface point #54603 Z-direction coordinate of the tooth surface point #54604 Single pitch error of the face gear #54605 Cumulative pitch error of the face gear #54606 Runout error of the face gear #54607 Tooth thickness error of the face gear #54608

[0039] S4 develops the in - machine detection macro program and detection interface based on the dedicated CNC gear grinding machine;

[0040] In the embodiment of the present invention, the in - machine detection macro program includes a safety movement program, a measurement movement program, a face gear pitch measurement program, and a face gear tooth point measurement program.

[0041] Safety movement program: If the probe is touched before the instruction is completed, the movement stops and retreats a certain safe distance;

[0042] Measurement movement program: Plans the travel for the position to be measured. After the probe touches the position to be measured, it returns the touch position coordinates and retreats a certain safe distance;

[0043] Face gear pitch measurement program: Plans the measurement path of the center point of the tooth surface based on the basic parameters of the face gear, outputs the measurement code for measuring the pitch, realizes the measurement of the center point of the tooth surface and outputs the position coordinates;

[0044] Face gear tooth point measurement program: Plans the measurement path of the tooth point based on the basic parameters of the face gear, outputs the measurement code for measuring the tooth point, realizes the measurement of the tooth point and outputs the position coordinates;

[0045] Such as Figure 3As shown in the figure, the dedicated in-machine detection interface of the face gear grinding machine includes input of face gear parameters, input of measurement parameters, coordinates of the current measurement point, generation of tooth pitch measurement program, generation of tooth surface point measurement program, calculation of face gear accuracy, output of face gear profile error, and display of face gear accuracy results.

[0046] S5 Conducts in-machine detection tests based on the dedicated CNC grinding machine.

[0047] Specific method:

[0048] After finishing the face gear grinding process, input the basic parameters of the face gear, measurement parameters, and the coordinates of each axis for tool setting during machining.

[0049] S52 Generates and runs the tooth pitch measurement program for the face gear, calculates the single tooth pitch error of the face gear, cumulative tooth pitch error of the face gear, tooth runout error of the face gear, and tooth thickness error of the face gear.

[0050] S53 Generates and runs the tooth surface point measurement program for the face gear, calculates the face gear profile error.

[0051] S54 Judges whether the accuracy of the face gear detected in-machine meets the requirements. If not, perform machining correction and detection. If the requirements are met, the machining is completed.

[0052] In the embodiment of the present invention, taking the detection of a face gear with a module of 4 as an example, the basic parameters are shown in Table 2.

[0053] Table 2 Basic parameters of the face gear

[0054] Module 4 mm Number of teeth of the face gear 38 Number of teeth of the virtual pinion 7 Tooth height 6.0657 mm Inner radius 65 mm Outer radius 93 mm Probe radius 0.5 mm

[0055] The in-machine detection method using a dedicated face gear grinding machine is more convenient and intelligent, and greatly improves the machining efficiency and machining accuracy of the face gear, providing technical support for the improvement of face gear machining equipment and the popularization and application of face gear technology.

[0056] The above-disclosed is only a preferred embodiment of the in-machine detection method of a dedicated face gear grinding machine of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. An in-machine inspection method for a special face gear grinding machine, characterized in that, It includes the following steps; Based on a dedicated CNC gear grinding machine, install the hardware devices of the measurement system under the grinding head component, including a swing arm unit and a probe unit, and complete the wiring of the measurement system; Conduct functional tests on the swing-out, swing-in of the swing arm unit and the signal input and output of the probe unit, and complete the calibration of the coordinate system, probe length, probe eccentricity value, and measurement radius of the measurement system; Set macro variables for the in-machine detection function based on the dedicated CNC gear grinding machine; Develop in-machine detection macro programs and detection interfaces based on the dedicated CNC gear grinding machine; Conduct in-machine detection tests based on the dedicated CNC gear grinding machine.

2. The in-machine detection method of the dedicated face gear grinding machine according to claim 1, wherein; The macro variables of the detection function include macro variables of basic face gear parameters, measurement input macro variables, measurement output macro variables, and face gear accuracy macro variables.

3. The in-machine detection method of the special face gear grinding machine according to claim 2, It is characterized in that; The macro variables of the basic face gear parameters include module, pressure angle, number of teeth of the virtual pinion, number of teeth of the face gear, addendum coefficient, clearance coefficient, tangential modification coefficient, height modification coefficient, outer radius of the face gear, and inner radius of the face gear. The measurement input macro variables include probe length, probe radius, workpiece machining tool setting X-axis coordinate, workpiece machining tool setting Y-axis coordinate, workpiece machining tool setting Z-axis coordinate, and workpiece machining tool setting A-axis coordinate. The measurement output macro variables include the Z-direction coordinate of the face gear tooth point, the Y-direction coordinate of the face gear tooth point, and the Z-direction coordinate of the face gear tooth point. The face gear accuracy macro variables include single pitch error of the face gear, cumulative pitch error of the face gear, tooth runout error of the face gear, tooth thickness error of the face gear, and tooth profile error of the face gear.

4. The in-machine detection method of the special face gear grinding machine according to claim 1, It is characterized in that; The in-machine detection macro program includes a safety movement program, a measurement movement program, a face gear pitch measurement program, and a face gear tooth point measurement program. The detection interface includes measurement input parameters, current measurement point output coordinates, tooth pitch measurement program generation, tooth point measurement program generation, and face gear accuracy calculation results.

5. The in-machine detection method of the special face gear grinding machine according to claim 4, It is characterized in that; The specific method of conducting in-machine detection tests based on the dedicated CNC gear grinding machine: After finishing the face gear grinding process, input the basic face gear parameters, measurement parameters, and each axis coordinate of the machining tool setting; Generate and run the face gear pitch measurement program, and calculate the single pitch error of the face gear, the cumulative pitch error of the face gear, the tooth runout error of the face gear, and the tooth thickness error of the face gear; Generate and run the face gear tooth point measurement program, and calculate the tooth profile error of the face gear; Judge whether the face gear accuracy detected in-machine meets the requirements. If not, perform machining correction and detection. If the requirements are met, the machining is completed.

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