A gear grinding machine tool rest A-axis rotation center alignment device and alignment method

Abstract

The present invention discloses a gear grinder tool rest A-axis rotation center alignment device, comprising a sensor and a standard ball. The present invention also discloses a gear grinder tool rest A-axis rotation center alignment method: calibrate the concentricity of the standard ball and the workbench; return the gear grinder tool rest A-axis to zero, then use the sensor to touch the standard ball, and calculate the touch point coordinate value, perform ball fitting calculation, and obtain the position of the center point of the standard ball relative to the zero point of the A-axis; rotate the tool rest A-axis from ‑45° to +45°, and calculate the position of the center point of the standard ball relative to the center point of the A-axis every 5° rotation; calculate the position of the tool rest A-axis rotation center point at each angle relative to the center point of the standard ball through point position data, thereby calculating the rotational geometric error of the tool rest A-axis. The gear grinder tool rest A-axis rotation center alignment device and alignment method disclosed by the present invention have a simple structure and are easy to operate, and can quickly measure the rotational geometric error of the tool rest A-axis.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical control machining, and in particular relates to a device and method for aligning the rotation center of an A-axis of a gear grinding machine tool rest. Background Art

[0002] Gear grinding machine is a metal cutting machine used for gear finishing. It adopts the generating method, using a large flat grinding wheel or two special grinding wheels; or adopts the forming method, using a forming grinding wheel to grind the gear tooth surface. Gear grinding machine has various geometric accuracy errors during the processing, among which the error measurement of the tool holder rotating axis is the most cumbersome.

[0003] Therefore, there is an urgent need for a alignment device that can detect the rotation center error of the A-axis of the gear grinding machine tool holder, so as to improve the machining accuracy of the gear grinding machine tool. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a device and method for aligning the rotation center of the A-axis of the tool holder of a gear grinding machine. The present invention aims to solve the problem of cumbersome measurement of the rotation center of the A-axis of the tool holder of a gear grinding machine.

[0005] To achieve the above-mentioned purpose, the present invention provides a device for aligning the rotation center of the A-axis of the tool holder of a gear grinding machine, comprising a sensor installed on the A-axis of the tool holder and a standard ball installed at the center position of the worktable of the gear grinding machine, wherein the sensor can measure the position coordinates of the standard ball, the diameter of the standard ball is 20 to 30 mm, the roundness of the standard ball is 0.2 to 0.5 μm, and the standard ball is detachably connected to the worktable.

[0006] Furthermore, the diameter of the standard ball is 25 mm.

[0007] Furthermore, the roundness of the standard sphere is 0.3 μm.

[0008] Furthermore, the standard ball is connected to the gear grinding machine workbench through screws.

[0009] Furthermore, the sensor is a MARPOSS T18 sensor.

[0010] The present invention also provides a method for aligning the rotation center of the A-axis of the gear grinding machine tool holder, and the specific operation is as follows:

[0011] S1. Place the standard ball at the center of the workbench, and then install the torsion spring meter. The torsion spring meter is adsorbed on the tool holder through a magnetic table holder, and the probe of the torsion spring meter is horizontally pointed to the center of the ball. Then move the tool holder up and down and observe the pointer of the torsion spring meter until the pointer of the torsion spring meter points to the maximum value.

[0012] S2. Rotate the workbench and observe the movement of the torsion spring gauge pointer to check the concentricity between the standard ball and the workbench. After the check is qualified, tighten the screws to fix the standard ball on the workbench.

[0013] S3, return the A axis of the gear grinding machine tool holder to zero, then use the sensor to touch 7 to 11 evenly distributed points within the maximum range of the standard ball, calculate the coordinate values ​​of the above-mentioned touch points, and perform ball fitting calculation to obtain the diameter and center coordinates of the fitting ball, that is, the relative position of the center of the standard ball relative to the zero point of the A axis;

[0014] S4, rotate the tool holder A axis from -45° to +45°, and repeat the measurement step of step S3 every time it rotates 5°, and calculate the relative position of the center of the standard ball relative to the center point of the A axis, for a total of 19 relative positions of the center of the standard ball relative to the center point of the A axis;

[0015] S5. Calculate the relative position of the rotation center point of each angle of the tool holder A axis with respect to the center point of the standard ball through the 19 point data of step S4, thereby calculating the rotation geometric error of the tool holder A axis, and then perform system compensation.

[0016] Furthermore, the standard for passing the concentricity calibration in step S2 is: pointer runout error ±2 μm.

[0017] Furthermore, the number of standard balls touched in step S3 is 9.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a device for aligning the rotation center of the A-axis of the tool holder of a gear grinding machine. The device of the present invention is composed of a sensor and a standard ball, and has a simple structure and low cost. The present invention also provides a method for aligning the rotation center of the A-axis of the tool holder of a gear grinding machine. The method of the present invention is easy to operate and has high measurement accuracy. The rotational geometric error of the A-axis of the tool holder can be quickly measured, and then the processing accuracy of the machine tool can be improved through system compensation.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a device for aligning the rotation center of the A-axis of a gear grinding machine tool holder according to the present invention;

[0022] Figure 2 This is a flow chart of a method for aligning the rotation center of the A-axis of a gear grinding machine tool holder according to the present invention;

[0023] The reference numerals in the figure are as follows: tool holder A axis 1, sensor 2, workbench 3, standard ball 4. DETAILED DESCRIPTION

[0024] In order to make the technical solutions, advantages and purposes of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of this application.

[0025] like Figure 1 As shown, the present invention provides a device for aligning the rotation center of the tool holder A axis of a gear grinding machine, comprising a sensor 2 installed on the tool holder A axis 1 and a standard ball 4 installed at the center position of a gear grinding machine worktable 3, the sensor 2 can measure the position coordinates of the standard ball 4, the diameter of the standard ball 4 in this embodiment is 25 mm, and the roundness is 0.3 μm. The sensor 2 in this embodiment is a MARPOSS T18 sensor, and the standard ball 4 is connected to the gear grinding machine worktable 3 by screws.

[0026] like Figure 2 As shown, the present invention also provides a method for aligning the rotation center of the A-axis of the tool holder of a gear grinding machine, and the specific operation is as follows:

[0027] S1. Place the standard ball 4 at the center of the workbench 3, then install the torsion spring meter. The torsion spring meter is adsorbed on the tool holder through the magnet table holder, and the probe of the torsion spring meter is horizontally pointed to the center of the ball. Then move the tool holder up and down and observe the pointer of the torsion spring meter until the pointer of the torsion spring meter points to the maximum value.

[0028] S2, rotate the workbench 3, observe the pointer jump of the torsion spring meter, and check the concentricity of the standard ball 4 and the workbench 3. The fluctuation of the pointer jump is required to be less than 2μm. After the calibration is qualified, tighten the screws to fix the standard ball 4 on the workbench 3;

[0029] S3, return the A axis 1 of the gear grinding machine tool holder to zero, then use the sensor 2 to touch 9 evenly distributed points within the maximum range of the standard ball 4, and calculate the coordinate values ​​of the above-mentioned touch points, and perform ball fitting calculation to obtain the diameter and center coordinates of the fitting ball, that is, the relative position of the center of the standard ball 4 relative to the zero point of the A axis;

[0030] S4, rotate the tool holder A axis 1 from -45° to +45°, and repeat the measurement step of step S3 every time it rotates 5°, and calculate the relative position of the center of the standard ball 4 relative to the center point of the A axis, for a total of 19 relative point positions of the center of the standard ball 4 relative to the center point of the A axis;

[0031] S5. Calculate the relative position of the rotation center of each angle of the tool holder A axis 1 relative to the center of the standard sphere 4 through the 19 point data of step S4, thereby calculating the rotation geometric error of the tool holder A axis 1, and then perform system compensation.

[0032] When using the alignment device of the present invention to align the rotation center of the gear grinder tool holder A axis 1, first install the standard ball 4 at the center of the gear grinder workbench 3. In order to ensure the concentricity of the standard ball 4 and the workbench 3, a torsion spring gauge needs to be installed for calibration. The torsion spring gauge is adsorbed on the tool holder through a magnet table seat. The calibration process is as follows: make the probe of the torsion spring gauge point horizontally to the center of the ball, then move the tool holder up and down, and observe the pointer of the torsion spring gauge at the same time until the pointer of the torsion spring gauge points to the maximum value. At this time, the measuring point of the probe is at the equatorial position of the standard ball 4, and the calibration accuracy is higher; then rotate the workbench 3, and the standard ball 4 rotates synchronously with the workbench 3. During the rotation, observe the pointer jump of the torsion spring gauge. If the fluctuation of the pointer jump is less than 2μm, it means that the calibration is qualified and the standard ball 4 is at the center of the workbench 3. Then tighten the screws to fix the standard ball 4 on the workbench 3.

[0033] After the standard ball 4 is installed, the tool holder A axis 1 of the gear grinding machine is returned to zero, and then the sensor 2 is used to touch 9 evenly distributed points within the maximum range of the standard ball 4, and the coordinate values ​​of the above 9 touch points are calculated, and the fitting calculation of the standard ball 4 is performed to obtain the diameter and the coordinates of the center of the fitting ball, that is, the relative position of the center of the standard ball 4 relative to the center point when the A axis is returned to zero; then the tool holder A axis 1 is rotated from -45° to +45°, and the sensor 2 is used to touch 9 evenly distributed points within the maximum range of the standard ball 4 for every 5° rotation, and the 9 coordinates of the center of the fitting ball are calculated. The coordinate value of the touch point is used to fit the standard sphere 4, so as to obtain the diameter and center coordinates of the fitting sphere, that is, the relative position of the center of the standard sphere 4 relative to the center point of the A-axis, and a total of 19 relative point positions of the center of the standard sphere 4 relative to the center point of the A-axis are obtained; through the above 19 point position data, the relative position of the rotation center point of the tool holder A-axis 1 relative to the center point of the standard sphere 4 at each rotation angle is calculated, so as to calculate the rotational geometric error of the tool holder A-axis 1 (error in the Y-axis and Z-axis directions), and finally perform system compensation to improve the machining accuracy of the machine tool.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the protection scope of the present invention.

Claims

1. A method for aligning the A-axis rotation center of a gear grinding machine tool holder, characterized in that: Including alignment device; The alignment device comprises a sensor (2) mounted on the tool holder A axis (1) and a standard ball (4) mounted at the center of a gear grinding machine workbench (3); the sensor (2) is capable of measuring the position coordinates of the standard ball (4); the diameter of the standard ball (4) is 20 to 30 mm; the roundness of the standard ball (4) is 0.2 to 0.5 μm; and the standard ball (4) is detachably connected to the workbench (3); The specific method of using the alignment device for alignment is as follows: S1. Place the standard ball (4) at the center of the workbench (3), then install a torsion spring gauge, which is adsorbed on the tool holder through a magnetic table holder, and make the probe of the torsion spring gauge point horizontally to the center of the ball, then move the tool holder up and down, and observe the pointer of the torsion spring gauge until the pointer of the torsion spring gauge points to the maximum value; S2, rotating the workbench (3), observing the movement of the torsion spring gauge pointer, thereby calibrating the concentricity between the standard ball (4) and the workbench (3), and after the calibration is qualified, tightening the screws to fix the standard ball (4) on the workbench (3); S3, returning the A axis (1) of the gear grinding machine tool holder to zero, then using the sensor (2) to touch 7 to 11 evenly distributed points within the maximum range of the standard ball (4), and calculating the coordinate values ​​of the above-mentioned touch points, performing ball fitting calculation, thereby obtaining the diameter and sphere center coordinates of the fitting ball, that is, obtaining the relative position of the center point of the standard ball (4) relative to the zero point of the A axis; S4, rotating the tool holder A axis (1) from -45° to +45°, repeating the measurement step of step S3 every time it rotates 5°, calculating the relative position of the center of the standard ball (4) relative to the center point of the A axis, and calculating the relative position of the center of the standard ball (4) relative to the center point of the A axis for a total of 19 points; S5. Calculate the relative position of the rotation center point of the tool holder A axis (1) at each angle relative to the center point of the standard sphere (4) through the 19 point position data of step S4, thereby calculating the rotation geometric error of the tool holder A axis (1), and then perform system compensation.

2. A method for aligning the rotation center of the A-axis of a gear grinding machine tool holder according to claim 1, characterized in that: The qualified standard of the concentricity calibration in step S2 is: pointer runout error ±2 μm.

3. The method for aligning the rotation center of the A-axis of the gear grinding machine tool holder according to claim 1, characterized in that: The number of touches of the standard ball (4) in step S3 is 9.

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