A rotary precision detection tooling, manufacturing method and detection method

Abstract

The present invention provides a rotation accuracy detection tool, comprising: a disk body and a sphere; the disk body is provided with a groove, the groove is annular and concentric with the disk body, a plurality of spheres are arranged in the groove, there are gaps between the spheres and the gaps are equal, and the axis of the disk body coincides with the rotation axis. A method for manufacturing a rotation accuracy detection tool, which can manufacture the rotary axis rotation accuracy detection tool disclosed in the present invention, and has high precision that meets the requirements. A method for detecting the rotation accuracy of a rotary axis, comprising the following steps: installing the rotary axis rotation accuracy detection tool on a workbench; rotating the workbench to a set angle; and measuring the rotation angle of the sphere. The rotation accuracy detection tool and detection method disclosed in the present invention can simply and accurately perform positioning accuracy detection and correction on the rotating axis of a five-axis machine tool.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool detection, and in particular to a rotary accuracy detection fixture, a manufacturing method and a detection method. Background Art

[0002] Currently, there are more and more five-axis CNC machine tools, and the rotary positioning accuracy of the machine tools needs to be calibrated and compensated regularly. In the existing technology, laser interferometers are generally used for calibration and compensation.

[0003] However, when using a laser interferometer to check and correct the positioning accuracy of the rotating axis, not only is the operation very troublesome, but the accuracy of the inspection and correction is also difficult to guarantee, which seriously affects the machine tool's processing of high-precision workpieces. Summary of the Invention

[0004] The present invention provides a rotation accuracy detection tool, a manufacturing method and a detection method to solve the above problems.

[0005] A rotary precision detection tool comprises: a disc and a ball;

[0006] The disc body is provided with a groove, which is annular and concentric with the disc body. A plurality of balls are arranged in the groove, with equal gaps between the balls. The axis of the disc body coincides with the rotation axis.

[0007] Furthermore, the groove includes an inner side surface, an outer side surface and a bottom surface, the height of the outer side surface is not less than the radius of the sphere, and the sphere is in contact with the outer side surface and the bottom surface.

[0008] Furthermore, the groove includes an inner side surface, an outer side surface and a bottom surface, the height of the outer side surface is not greater than the radius of the sphere, and the sphere is in contact with the upper edge and bottom surface of the outer side surface.

[0009] Furthermore, there are 72 balls in total, and there are gaps between the balls.

[0010] Furthermore, it also includes a centering rod, the disk body is provided with a center hole, the centering rod passes through the center hole, the axis of the centering rod coincides with the rotation axis of the workbench and coincides with the axis of the center hole.

[0011] Furthermore, it also includes a coordinate rod, one end of which is hinged to the centering rod and can move along the axis of the centering rod, and the other end is provided with a positioning ball, and the positioning ball is located above the sphere.

[0012] A method for manufacturing a rotary accuracy detection tool, characterized by comprising the following steps:

[0013] S1: setting a groove on the disc body;

[0014] S2: A ball is placed in the groove;

[0015] S3: injecting liquid shaping material into the groove so that the lower part of the ball is immersed in the shaping material;

[0016] S4: The drive disc rotates at a constant speed until the shaping material is shaped and solidified.

[0017] A rotation accuracy detection method comprises the following steps:

[0018] S1: Install the rotary axis rotation accuracy detection tooling on the workbench;

[0019] S2: Workbench rotation setting angle;

[0020] S3: Measure the rotation angle of the ball.

[0021] Furthermore, the angle of rotation of the workbench is equal to an integer multiple of γ, γ=360° / n, where n is the number of spheres.

[0022] Furthermore, the spindle is equipped with a lever micrometer. Any ball is set as the initial ball. The spindle drives the lever micrometer to detect the position of point A on the surface of the initial ball. After the servo motor rotates the set angle, the spindle drives the lever micrometer to detect the position of point B on the surface of the ball at the same Z-axis position, and compares the positions of point A and point B on the X-axis and Y-axis.

[0023] The present invention discloses a rotary accuracy detection tool and a detection method, which can simply and accurately detect and correct the positioning accuracy of the rotating axis of a five-axis machine tool. The present invention discloses a rotary axis rotary accuracy detection tool manufacturing method, which can manufacture the rotary axis rotary accuracy detection tool disclosed in the present invention, and has high precision that meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0025] Figure 1 This is a schematic diagram of the structure of a rotary accuracy detection tool disclosed in Example 1 of the present invention;

[0026] Figure 2 A top view of a rotary accuracy detection tool disclosed in Example 1 of the present invention;

[0027] Figure 3 for Figure 2Cross-sectional view from medium AA perspective;

[0028] Figure 4 for Figure 3 Enlarged view of part B;

[0029] Figure 5 This is an enlarged view of the spherical portion disclosed in Example 2 of the present invention.

[0030] In the picture:

[0031] 1. Plate body; 11. Groove; 12. Inner side; 13. Outer side; 14. Bottom;

[0032] 2. Ball;

[0033] 3. Centering rod;

[0034] 4. Workbench;

[0035] 5. Coordinate rod; 51. Positioning ball. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in 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 only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1 、 Figure 2 As shown, a rotary accuracy detection tool comprises: a disc 1 and a ball 2;

[0039] The disc body 1 is provided with an annular groove 11 concentric with the disc body 1 , and a plurality of balls 2 are arranged in the groove 11 , with gaps between the balls 2 , and the gaps between the balls 2 are equal, and the axis of the disc body 1 coincides with the rotation axis.

[0040] The balls in this embodiment are G10 grade high precision steel balls, the groove 11 is an annular groove, the circular groove is concentric with the disc body 1, the gap between the balls is very small, and the balls are nearly fully loaded.

[0041] The spheres divide the circumference into several equal parts. Due to the high precision of the spheres, when the disk 1 rotates about its own axis, the angle corresponding to the same position on each sphere is the same. Specifically, when the disk 1 is fixed to the workbench where the rotary axis is located, the workbench rotates, and the disk rotates with it. The servo motor drives the workbench to rotate through a fixed angle. The angular error between the actual angle of rotation of the workbench and the angle driven by the servo motor can be measured by high-precision spheres set at equal intervals. The spheres divide the circumference equally, and the angle corresponding to the rotation of each sphere is fixed. The angle rotated by the servo motor is set as a fixed multiple of the corresponding angle of each sphere. The actual angle rotated by the disk can be calculated by measuring the change in the relative position of each sphere. The angle rotated by the disk is the angle rotated by the workbench. The error α of the angle rotated by the workbench can be obtained from this. The obtained angular error is then compared with the angle corresponding to the CNC system's rotation compensation file to determine the new angle compensation value ±α.

[0042] like Figure 3 、 Figure 4 As shown, in this embodiment, the groove 11 includes an inner side 12, an outer side 13, and a bottom 14. The height of the outer side 13 is no greater than the radius of the sphere 2, and the sphere 2 abuts against the upper edge of the outer side 13 and the bottom 14. Among multiple spheres 2, the closest point on the sphere is the detection point. The position of this point can be measured using a high-power microscope or laser measurement, thereby determining the angle of rotation of the disk. The upper edge of the outer side 13 is lower than the detection point and can be directly observed and measured using a high-power microscope.

[0043] The ball 2 is in close contact with the upper edge of the outer side surface, and by controlling the accuracy of the outer side surface, the position accuracy of the ball 2 is made higher. At the same time, the inner side surface does not contact the ball 2, so as to avoid affecting the position accuracy of the ball 2.

[0044] In this embodiment, there are 72 balls 2, with gaps between them of approximately 0.005 mm width. The 72 balls divide the circumference equally, and each ball corresponds to an angle of 5°. That is, when each ball is rotated to the same position, the corresponding angle is 5°.

[0045] This embodiment also includes a centering rod 3. The disk body 1 is provided with a center hole. The axis of the centering rod 3 coincides with the rotation axis of the worktable 4 and the axis of the center hole. The worktable 4 has a positioning hole at its rotation center. The centering rod 3 passes through the center hole and the positioning hole in the worktable 4, ensuring that the disk body 1 and the worktable 4 are coaxial.

[0046] This embodiment further includes a coordinate rod 5 , one end of which is hinged to the centering rod 3 and can move along the axis of the centering rod 3 , and the other end of which is provided with a positioning ball 51 , which is located above the sphere 2 .

[0047] Coordinate rod 5 moves along the axis of centering rod 3, bringing positioning ball 51 into contact with two adjacent spheres 2. The straight line along which coordinate rod 5 lies now passes between the two adjacent spheres 2. By rotating the workbench, the initial position of spheres 2 is determined by the angle of coordinate rod 5, facilitating observation and measurement using a high-power microscope or laser measurement.

[0048] The manufacturing method of the rotary accuracy detection tool in this embodiment includes the following steps:

[0049] S1: setting a groove on the disc body;

[0050] S2: A ball is placed in the groove;

[0051] S3: injecting liquid shaping material into the groove so that the lower part of the ball is immersed in the shaping material;

[0052] S4: The drive disc rotates at a constant speed until the shaping material is shaped and solidified.

[0053] As the disc rotates at a constant speed, the balls follow it. Each ball is subjected to the same centrifugal force. As the disc rotates, the balls gradually collide and rub against each other, adjusting the distance between them until they are exactly the same. This centrifugal force prevents the distance between the balls from changing, and the disc maintains its rotation until the shaping material solidifies, locking the balls in place.

[0054] The shaping material in this embodiment is resin, which is injected into the groove. When the resin is solidified, the position of the ball can be fixed and the same gap can be maintained.

[0055] This embodiment also discloses a rotation accuracy detection method, comprising the following steps:

[0056] S1: Install the rotary accuracy detection fixture on the workbench; the centering rod 3 passes through the center hole 16 and the positioning hole on the workbench 4 to make the disk body 1 and the workbench 4 coaxial.

[0057] S2: The servo motor drives the workbench to rotate to a set angle; the angle of rotation of the workbench is equal to an integer multiple of γ, γ = 360° / n, where n is the number of balls.

[0058] S3: Detect the rotation angle of the ball.

[0059] Specific methods for detecting the rotation angle of the ball include but are not limited to microscope observation measurement method, laser measurement method and lever micrometer measurement method.

[0060] The microscope observation measurement method uses a high-power microscope, with a magnification of 1000x in this example, and a scale. First, a steel ball is selected, with the selected detection point on the ball serving as the initial detection point. This point is positioned for easy observation. The microscope is then positioned so that it faces the initial detection point. The servo motor is then activated to rotate the ball through a specified angle, such as 5°. After the rotation is complete, the offset of the detection point is read using the scale on the microscope, and the angular error is calculated from this offset.

[0061] The laser measurement method is similar to the microscope observation measurement method. The difference is that the laser is adjusted to the position exactly blocked by the detection point, and then the servo motor is started. After rotating the set angle, the position exactly blocked by the detection point is detected again by the laser. The difference between the two positions is the offset of the detection point, and the angle error is calculated based on the offset.

[0062] The lever dial indicator measurement method involves first installing a lever dial indicator on the spindle. The spindle then drives the lever dial indicator, setting any sphere as the initial sphere. The lever dial indicator then detects the position of any point A on the surface of the selected initial sphere, preferably the highest point on the sphere. The spindle then drives the lever dial indicator away from the detection position. After the servo motor drives the worktable to rotate a set angle, the spindle then drives the lever dial indicator to detect the position of point B on the surface of the sphere at the same Z-axis position. The positions of points A and B on the X and Y axes are then compared. The lever dial indicator can detect the offset between points A and B, and the angular error can be calculated from this offset.

[0063] During detection, the preferred measuring direction is the Y-axis direction of the machine tool. Move the coordinate rod downward and make the positioning ball 51 abut against the two balls. Adjust the rotation axis so that the coordinate rod is parallel to the Y-axis. At this time, one of the two balls abutting against the positioning ball 51 can be selected as the initial ball. The measurement position at this time is better.

[0064] The test needs to be carried out multiple times and the data needs to be recorded multiple times. Through multiple tests, the angle error α is calculated, and the obtained angle error is compared with the angle corresponding to the CNC system rotation compensation file to determine the new angle compensation value ±α.

[0065] Example 2

[0066] like Figure 5 As shown, this embodiment is different from embodiment 1 in that the groove 11 includes an inner side surface 12, an outer side surface 13 and a bottom surface 14, the height of the outer side surface 13 is not less than the radius of the sphere 2, and the sphere 2 is in contact with the outer side surface 13 and the bottom surface 14.

[0067] The outer side 13 is higher, and during the working process, when the disc body is rotating, the ball is more stable in the groove and avoids flying out. When testing, a lever dial indicator measurement method can be adopted.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary accuracy detection tool, characterized in that: include: A disc (1) and a sphere (2); The disc body (1) is provided with a groove (11), the groove (11) is annular and concentric with the disc body (1), a plurality of the balls (2) are provided in the groove (11), there are gaps between the balls (2) and the gaps are equal, the relative positions of the balls (2) and the disc body (1) are fixed, and the axis of the disc body (1) coincides with the axis of rotation; It also includes a centering rod (3), the disk body (1) is provided with a center hole (16), the centering rod (3) passes through the center hole (16), and the axis of the centering rod (3) coincides with the rotation axis of the workbench (4) and coincides with the axis of the center hole (16).

2. A rotary accuracy detection tool according to claim 1, characterized in that: The groove (11) comprises an inner side surface (12), an outer side surface (13) and a bottom surface (14); the height of the outer side surface (13) is not less than the radius of the sphere (2); and the sphere (2) is in contact with the outer side surface (13) and the bottom surface (14).

3. The rotary accuracy detection tool according to claim 1, characterized in that: The groove (11) comprises an inner side surface (12), an outer side surface (13) and a bottom surface (14); the height of the outer side surface (13) is not greater than the radius of the sphere (2); and the sphere (2) abuts against the upper edge and bottom surface (14) of the outer side surface (13).

4. The rotary accuracy detection tool according to claim 1, characterized in that: There are 72 balls (2) in total, and there are gaps between the balls (2).

5. The rotary accuracy detection tool according to claim 1, characterized in that: It also includes a coordinate rod (5), one end of which is hinged to the centering rod (3) and can move along the axis of the centering rod (3), and the other end of which is provided with a positioning ball (51), and the positioning ball (51) is located above the sphere (2).

6. A method for manufacturing a rotary accuracy detection tool according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: setting a groove on the disc body; S2: A ball is placed in the groove; S3: injecting liquid shaping material into the groove so that the lower part of the ball is immersed in the shaping material; S4: The drive disc rotates at a constant speed until the shaping material is shaped and solidified.

7. A rotation accuracy detection method, characterized in that: Using the rotary accuracy detection tooling according to claim 1 comprises the following steps: S1: Install the rotation accuracy detection tooling according to any one of claims 1 to 5 on a workbench; S2: The servo motor rotates to the set angle; S3: Measure the rotation angle of the ball.

8. A rotation accuracy detection method according to claim 7, characterized in that: The angle of rotation of the workbench is equal to an integer multiple of γ, γ=360° / n, where n is the number of spheres.

9. A rotation accuracy detection method according to claim 8, characterized in that: The spindle is equipped with a lever dial indicator. Set any ball as the initial ball. The spindle drives the lever dial indicator to detect the position of point A on the surface of the initial ball. After the servo motor rotates the set angle, the spindle drives the lever dial indicator to detect the position of point B on the surface of the ball at the same Z-axis position, and compares the positions of point A and point B on the X-axis and Y-axis.

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