Optical path adjustment device and detection method for precision detection of CNC machine tools

Abstract

The present invention discloses an optical path adjustment device for precision detection of numerically controlled machine tools, comprising a lifting platform, a translation platform fixedly installed in the lifting platform, a rotating platform fixedly connected to the lower part of the translation platform; an angular platform fixedly connected to the lower part of the rotating platform through a connecting plate, the upper part of one side of the connecting plate fixedly connected to the lower part of the rotating platform, and the lower part of the other side of the connecting plate fixedly connected to the angular platform; a U-shaped clamping plate fixedly connected to the lower part of the angular platform, a laser interferometer fixedly installed in the U-shaped groove on one side of the U-shaped clamping plate; a mounting frame fixedly installed at the lower part of the U-shaped groove of the U-shaped clamping plate, an interferometer group matching the position of the laser interferometer installed on the mounting frame, and the laser emitted by the laser interferometer passes through the interferometer group. The optical path adjustment device provided by the present invention can follow the movement of the head of the numerically controlled machine tool in the same trajectory to realize the position adjustment of the laser interferometer, and judge the operating accuracy of the numerically controlled machine tool by whether the laser interferometer input port can receive the returned laser beam.

Description

Technical Field

[0001] The present invention relates to the technical field of precision detection of numerically controlled machine tools, and in particular to an optical path adjustment device for precision detection of numerically controlled machine tools and a detection method thereof. Background Art

[0002] In the automotive and aerospace manufacturing industries, the demand for machining precision of parts is becoming increasingly stringent, and ensuring the geometric accuracy of CNC machine tools has become a hot topic in manufacturing research. Currently, ensuring geometric accuracy of machine tools is primarily accomplished through regular error detection and compensation to meet the machining precision requirements of parts.

[0003] The primary purpose of machine tool error detection and compensation is to improve the geometric accuracy of machine tools. Appropriate use of error detection tools and error identification methods can effectively improve the geometric accuracy of the translational axes of multi-axis CNC machine tools. Currently, laser interferometers are widely used as error detection tools. The entire detection system consists of a laser interferometer, a reflector, an interferometer, a mounting handle, a magnetic base, and a laser interferometer tripod. Existing error identification methods based on laser reflectometers, such as the 9-line method, the 12-line method, the 14-line method, and the 15-line method, exist domestically and internationally. While the 9-line method only requires single-axis error detection, all other detection methods require the detection of two- or three-axis linkage trajectory positioning errors. Whether detecting single-axis or multi-axis positioning errors, the laser interferometer's position and posture must be properly adjusted, coordinated with the interferometer and the reflector mounted on the spindle head to achieve machine tool error detection. Generally, laser interferometers can easily detect arbitrary lines within a horizontal plane. However, because the laser interferometer is connected to the tripod via a pan-tilt adjustment and threaded connections, the pan-tilt adjustment cannot precisely adjust the laser interferometer's offset angle. Whether detecting a straight line in the horizontal plane, such as a linear trajectory linked by the X and Y axes, or a straight line in the vertical plane, such as a linear trajectory linked by the XZ, YZ, or XYZ axes, the position and posture of the laser interferometer must be adjusted manually, resulting in low adjustment efficiency and accuracy, which is not conducive to industrial automation. Therefore, an optical path adjustment device and method for precision detection of CNC machine tools is designed, equipped with a laser interferometer. Summary of the Invention

[0004] The purpose of the present invention is to provide an optical path adjustment device for precision detection of CNC machine tools, which is equipped with a laser interferometer to flexibly realize multi-degree-of-freedom precision motion of the laser interferometer and complete the geometric precision detection of the translation axis of a multi-axis CNC machine tool.

[0005] Another object of the present invention is to provide a method for performing precision detection of CNC machine tools using the above-mentioned optical path adjustment device for precision detection of CNC machine tools.

[0006] The present invention is realized by the following technical scheme: an optical path adjustment device for precision detection of CNC machine tools, comprising a lifting platform that can be lifted up and down, a translation platform that can be lifted up and down with the lifting platform is fixedly installed in the lifting platform, a rotating platform is fixedly connected to the lower part of the translation platform, and the rotating platform can perform left and right reciprocating translation motion under the action of the translation platform; the lower part of the rotating platform is fixedly connected to the angular position platform through a connecting plate, the upper part of one side of the connecting plate is fixedly connected to the lower part of the rotating platform, and the lower part of the other side of the connecting plate is fixedly connected to the angular position platform; the connecting plate can be rotated Under the action of the rotating table, it rotates and drives the angle table to rotate laterally below the rotating table. The lower part of the angle table is fixedly connected to a U-shaped clamping plate, and a laser interferometer is fixedly installed in the U-shaped groove on one side of the U-shaped clamping plate. The U-shaped clamping plate can swing under the action of the angle table and drive the laser interferometer fixed in the U-shaped groove to swing; a mounting frame is fixedly installed at the lower part of the U-shaped groove of the U-shaped clamping plate, and an interferometer group matching the position of the laser interferometer is installed on the mounting frame. The laser emitted by the laser interferometer passes through the interferometer group.

[0007] In order to better realize the present invention, further, the lifting platform includes a first fixed plate at the bottom and a second fixed plate at the top that are parallel to each other, and the first fixed plate and the second fixed plate are fixedly connected by several first optical axes; it also includes a first movable plate located between the first fixed plate and the second fixed plate, and a second movable plate located above the second fixed plate, the first movable plate and the second movable plate are fixedly connected by several second optical axes that pass through the second fixed plate, all of the first optical axes pass through the first movable plate, the first movable plate can move up and down along the first optical axis, and the second movable plate is driven to move up and down by the second optical axis; the first fixed plate, the second fixed plate, the first movable plate, and the second movable plate are all parallel to each other, and the first optical axis and the second optical axis are both perpendicular to the plane where the first movable plate is located.

[0008] In order to better realize the present invention, the lifting platform further includes a first drive motor installed on the second movable plate, and a vertical screw is also arranged between the first movable plate and the first movable plate, the lower end of the screw is connected to the screw bearing installed on the first movable plate, and the other end is connected to the first drive motor; the second fixed plate is provided with a screw nut, and the screw passes through the second fixed plate through the screw nut; the first drive motor has a built-in reducer module, and the first drive motor can drive the screw to rotate, thereby driving the first movable plate and the second movable plate to rise or fall.

[0009] In order to better realize the present invention, further, the translation table includes a base fixed to the lower part of the first movable plate, a U-shaped groove is provided in the base, a precision screw is horizontally provided in the U-shaped groove of the base, one end of the precision screw extends out of the base and is connected to a second drive motor, a movable platform is threadedly connected to the precision screw in the U-shaped groove, and guide rails slidably connected to the movable platform are provided on both sides of the precision screw in the U-shaped groove of the base, the lower part of the movable platform is fixedly connected to the rotating table, and the second drive motor can drive the precision screw to rotate, thereby driving the movable platform threadedly connected to the precision screw to slide back and forth on the guide rail in the U-shaped groove of the base.

[0010] In order to better realize the present invention, further, the rotating table includes a translation base fixedly connected to the mobile platform, the rotating platform is installed at the lower part of the translation base, and a third drive motor is installed on the side of the translation base, and the third drive motor drives the rotating platform to rotate through a coupling.

[0011] In order to better implement the present invention, further, the corner table includes a rotating base fixedly connected to the lower part of one side of the connecting plate, a pitch platform is provided at the lower part of the rotating base, and a fourth driving motor is provided at the end of the rotating base to drive the pitch platform to swing.

[0012] In order to better implement the present invention, further, the thickness of the connecting plate and the U-shaped clamping plate are both mm.

[0013] A method for performing precision testing on a CNC machine tool based on the optical path adjustment device for precision testing on a CNC machine tool comprises the following steps:

[0014] S1: Assemble the optical path adjustment device for the CNC machine tool precision detection;

[0015] S2: placing the lifting platform in the optical path adjustment device on the machine bed of the CNC machine tool under test, installing a reflector on the head of the CNC machine tool under test, so that the laser interferometer and the interferometer lens group in the optical path adjustment device are kept horizontal, and then adjusting the reflector installed on the head of the CNC machine tool under test so that the reflector can reflect the laser light emitted by the laser interferometer and the laser light reflected by the reflector can overlap with the laser light reflected by the interferometer lens group;

[0016] S3: Make the head of the CNC machine tool run according to the instructions, and at the same time control the various drive motors in the optical path adjustment device so that the laser interferometer, the interference lens group and the head maintain the same running trajectory. If the laser reflected by the reflector can always coincide with the laser reflected by the interference lens group, it proves that the operation accuracy of the CNC machine tool is high. If the laser reflected by the reflector deviates from the laser reflected by the interference lens group, the operation accuracy of the CNC machine tool needs to be adjusted.

[0017] In order to better implement the method of the present invention, further, the CNC machine tool is a gantry CA swing head five-axis CNC machine tool, and the gantry CA swing head five-axis CNC machine tool includes a machine tool bed, an X-axis motion unit, a Y-axis motion unit, a Z-axis motion unit, a C-axis swing unit, and an A-axis swing unit. The head of the gantry CA swing head five-axis CNC machine tool is the A-axis swing unit.

[0018] In order to better implement the method of the present invention, the head of the CNC machine tool is further installed with a reflector through an auxiliary fixture, and the auxiliary fixture can ensure that when the CNC machine tool is not running, the laser reflected by the reflector coincides with the laser reflected by the interference mirror group.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] (1) The optical path adjustment device provided by the present invention can follow the movement of the head of the CNC machine tool in the same trajectory to achieve the position adjustment of the laser interferometer. The operating accuracy of the CNC machine tool is determined by whether the laser interferometer input port can receive the returned laser beam;

[0021] (2) The optical path adjustment device provided by the present invention has a simple structure and high motion accuracy. Through the lifting platform, translation platform, rotation platform, and angular positioning platform, the laser interferometer can be moved in the horizontal and vertical directions, and can also be rotated at a large angle around the vertical direction and pitched at a small angle in the horizontal direction, providing convenience for the detection and identification of the geometric accuracy of the translation axis of a multi-axis CNC machine tool;

[0022] (3) The present invention can conveniently detect the positioning error of a straight line in a horizontal plane and a straight line inclined at a certain angle to the horizontal plane during the precision detection of a CNC machine tool, thereby improving the detection efficiency and detection accuracy of the geometric error of the horizontal axis of a multi-axis machine tool, saving a lot of time and cost, and facilitating automation;

[0023] (4) The lifting platform, translation platform, rotation platform, and angular positioning platform in the optical path adjustment device provided by the present invention can move independently or in conjunction with each other, and can accurately adjust the angle of the laser beam of the laser interferometer to match the angle of the reflector, thereby completing the detection of the linear positioning accuracy of a single translation axis and the tilt linear positioning accuracy of multiple translation axes;

[0024] (5) The optical path adjustment device provided by the present invention can control the operation of the drive motor through the control board program, has high movement accuracy, does not rely on manual adjustment, has low time cost, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 Schematic diagram of the three-dimensional structure of the lifting platform in the present invention;

[0028] Figure 3 This is a schematic diagram of the explosion structure excluding the lifting platform in the present invention;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of the translation stage in the present invention;

[0030] Figure 5 Schematic diagram of the three-dimensional structure of the rotating platform in the present invention;

[0031] Figure 6 Schematic diagram of the three-dimensional structure of the corner table in the present invention;

[0032] Figure 7 Schematic diagram of the three-dimensional structure of the U-shaped clamping plate in the present invention;

[0033] Figure 8 Schematic diagram of the three-dimensional structure of the mounting frame of the present invention;

[0034] Figure 9 It is the structure of CA swing head five-axis CNC machine tool;

[0035] Figure 10 Schematic diagram of the accuracy test of the X-axis of the gantry CA swing head five-axis CNC machine tool in the present invention;

[0036] Figure 11 Schematic diagram of the accuracy test of the Y-axis of the gantry CA swing head five-axis CNC machine tool in the present invention;

[0037] Figure 12 Schematic diagram of the accuracy test of the Z axis of the gantry CA swing head five-axis CNC machine tool in the present invention;

[0038] Figure 13 This is a schematic diagram of the optical path for detecting CNC machine tools in the present invention.

[0039] Among them: 1 - lifting platform, 101 - first fixed plate, 102 - second fixed plate, 103 - first optical axis, 104 - first movable plate, 105 - second movable plate, 106 - second optical axis, 107 - first drive motor, 108 - lead screw, 109 - lead screw bearing, 110 - lead screw nut, 2 - translation platform, 201 - base, 202 - precision lead screw, 203 - second drive motor, 204 - mobile platform, 205 - guide rail, 3 - rotation platform, 301 - translation base, 30 2—rotating platform, 303—third drive motor, 304—coupling, 4—connecting plate, 5—angular table, 501—rotating base, 502—pitch platform, 503—fourth drive motor, 6—U-shaped clamping plate, 7—laser interferometer, 8—mounting frame, 9—interference mirror group, 10—machine tool bed, 11—X-axis motion unit, 12—Y-axis motion unit, 13—Z-axis motion unit, 14—C-axis swing unit, 15—A-axis swing unit, 16—auxiliary fixture, 17—reflector. DETAILED DESCRIPTION

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 only to explain the present invention and are not to be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, it is limited that "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly including one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0043] Example 1:

[0044] The main structure of this embodiment is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 As shown, it includes a lifting platform 1 that can be lifted up and down, and a translation platform 2 that can be lifted and lowered with the lifting platform 1 is fixedly installed in the lifting platform 1. The lower part of the translation platform 2 is fixedly connected to a rotating platform 3, and the rotating platform 3 can perform left and right reciprocating translation movement under the action of the translation platform 2; the lower part of the rotating platform 3 is fixedly connected to the angular platform 5 through a connecting plate 4, and the upper part of one side of the connecting plate 4 is fixedly connected to the lower part of the rotating platform 3, and the lower part of the other side of the connecting plate 4 is fixedly connected to the angular platform 5; the connecting plate 4 can rotate under the action of the rotating platform 3 and drive the angular platform 5 The table 5 rotates on the lower side of the rotating table 3. A U-shaped clamping plate 6 is fixedly connected to the lower part of the angular table 5. A laser interferometer 7 is fixedly installed in the U-shaped groove on one side of the U-shaped clamping plate 6. The U-shaped clamping plate 6 can swing under the action of the angular table 5, and drive the laser interferometer 7 fixed in the U-shaped groove to swing; a mounting frame 8 is fixedly installed at the lower part of the U-shaped groove of the U-shaped clamping plate 6, and an interferometer group 9 matching the position of the laser interferometer 7 is installed on the mounting frame 8. The laser emitted by the laser interferometer 7 passes through the interferometer group 9.

[0045] The specific process of using the optical path adjustment device to detect the accuracy of CNC machine tools is as follows:

[0046] S1: Assemble the optical path adjustment device for precision detection of CNC machine tools;

[0047] S2: Place the lifting platform in the optical path adjustment device on the machine bed 10 of the CNC machine tool to be tested, install a reflector 17 on the head of the CNC machine tool to keep the laser interferometer 7 and the interferometer lens group 9 in the optical path adjustment device level, and then adjust the reflector 17 installed on the head of the CNC machine tool to be tested so that the reflector 17 can reflect the laser emitted by the laser interferometer 7 and the laser reflected by the reflector 17 can overlap with the laser reflected by the interferometer lens group 8; the laser interferometer 7 emits a laser beam, which is divided into three optical paths through the interferometer lens group 9 and the reflector 17, as shown in FIG. Figure 13As shown, optical path one is abcdef, optical path two is abghij, and optical path three is abghif; the relative geometric relationship between optical paths two and three is fixed, so photoelectric detectors can be set at three locations along the optical path to feed back position signals to the optical path adjustment device. The position of the laser interferometer 7 is adjusted by the lifting platform 1, translation platform 2, rotation platform 3, and angular platform 5 in the optical path adjustment device to ensure the initial position. The laser emitted by the laser interferometer can enter the incident port through the reflector 17, thereby ensuring the accuracy of subsequent detection.

[0048] S3: The CNC machine tool's head operates according to the instructions. The lifting platform 1, translation platform 2, rotation platform 3, and angular positioning platform 5 in the optical path adjustment device ensure that the laser interferometer 7 and the interferometer lens assembly 9 maintain the same operating trajectory as the head. If the laser interferometer's incident port f cannot receive the incident light or the position of the incident light changes, the CNC machine tool's operating accuracy needs to be adjusted. If the laser reflected by the reflector consistently coincides with the laser reflected by the interferometer lens assembly, the CNC machine tool's operating accuracy is high. If the laser reflected by the reflector deviates from the laser reflected by the interferometer lens assembly, the CNC machine tool's operating accuracy needs to be adjusted.

[0049] Example 2:

[0050] This embodiment takes the gantry CA swing head five-axis CNC machine tool as an example to perform accuracy test on it. The structure of the gantry CA swing head five-axis CNC machine tool is as follows: Figure 9 As shown, the machine tool includes a bed 10, an X-axis motion unit 11, a Y-axis motion unit 12, a Z-axis motion unit 13, a C-axis swing unit 14, and an A-axis swing unit 15. The head of the gantry CA swing head five-axis CNC machine tool is the A-axis swing unit 15. The A-axis swing unit 15 is mounted with a reflector 17 through an auxiliary fixture 16.

[0051] Carry out precision inspection on X axis of gantry CA swing head five-axis CNC machine tool, such as Figure 10 As shown, the specific process is as follows: the laser interferometer 7 and the interferometer lens group 9 are rotated around the Z axis by controlling the rotating table 2; the translation along the Y axis is achieved by the translation table 2; the rotation and translation movements ensure that the laser emitted by the laser interferometer 7 and the reflected laser are in the same straight line, so that the single-axis positioning accuracy detection of the machine tool X axis can be completed.

[0052] Carry out precision inspection on X axis of gantry CA swing head five-axis CNC machine tool, such as Figure 11 As shown, the specific process is as follows: when detecting the Y-axis positioning accuracy, the optical path adjustment device needs to be placed in a direction parallel to the Y-axis to ensure that the laser emitted by the laser interferometer 7 and the reflected laser are in the same straight line so that the Y-axis positioning accuracy can be detected.

[0053] Carry out precision inspection on X axis of gantry CA swing head five-axis CNC machine tool, such as Figure 12 As shown, the specific process is as follows: when detecting the Z-axis positioning accuracy, the quick adjustment device needs to be placed below the Z-axis, and the interferometer group 9 is placed on the mounting bracket 8 to ensure that the reflector 17 returns to the point where the light passes through the interferometer and is parallel to the emitted laser, and then the Z-axis positioning accuracy can be detected.

[0054] When testing the XY linkage, YZ linkage, XZ axis linkage, and XYZ linkage trajectory positioning accuracy of a gantry CA swing head five-axis CNC machine tool, the process is basically the same as the single-axis accuracy testing process. When testing the XY linkage, XZ linkage, and XYZ linkage trajectory positioning accuracy, the optical path adjustment device can be placed on the machine tool workbench, and the reflector 17 installed on the laser interferometer auxiliary fixture is adjusted to the angle required for testing (XY, XZ, or XYZ diagonal). Then, by controlling the angle table 5 to achieve the pitch movement of the laser interferometer 7 and its interferometer lens group 9 (within a range of ±45°), ensuring that the transmitted laser and the reflected laser are in the same straight line, the XY linkage, XZ linkage, and XYZ linkage trajectory positioning accuracy testing can be performed. Similarly, when testing the YZ linkage trajectory positioning accuracy, the optical path adjustment device can be placed on the machine tool workbench, and the reflector 17 installed on the laser interferometer auxiliary fixture 16 is adjusted to the angle required for testing (YZ diagonal), ensuring that the transmitted laser and the reflected laser are in the same straight line, and the YZ linkage trajectory positioning accuracy testing can be performed.

[0055] Example 3:

[0056] Based on the above embodiment, this embodiment further defines the structure of the lifting platform 1, such as Figure 2 As shown, the lifting platform 1 includes a first fixed plate 101 at the bottom and a second fixed plate 102 at the top, which are parallel to each other. The first fixed plate 101 and the second fixed plate 102 are fixedly connected by a plurality of first optical axes 103. The lifting platform 1 also includes a first movable plate 104 located between the first fixed plate 101 and the second fixed plate 102, and a second movable plate 105 located above the second fixed plate 102. The first movable plate 104 and the second movable plate 105 are fixedly connected by a plurality of second optical axes 106 that pass through the second fixed plate 102. All of the first optical axes 103 pass through the first movable plate 104. The first movable plate 104 can move up and down along the first optical axes 103, and the second movable plate 105 can move up and down along the second optical axes 106. The first fixed plate 101, the second fixed plate 102, the first movable plate 104, and the second movable plate 105 are all parallel to each other, and the first optical axes 103 and the second optical axes 106 are all perpendicular to the plane of the first movable plate 104. The rest of this embodiment is the same as the above embodiment and will not be repeated.

[0057] Example 4:

[0058] Based on the above embodiment, this embodiment further defines the structure of the lifting platform 1, such as Figure 2 As shown, the lifting platform 1 also includes a first drive motor 107 mounted on the second movable plate 105. A vertical screw 108 is also provided between the second movable plate 105 and the first movable plate 104. The lower end of the screw 108 is connected to a screw bearing 109 mounted on the first movable plate 104, and the other end is connected to the first drive motor 107. A screw nut 110 is provided on the second fixed plate 102, and the screw 108 passes through the second fixed plate 102 through the screw nut 110. The first drive motor 107 has a built-in reducer module, and the first drive motor 107 can drive the screw 108 to rotate, thereby driving the first movable plate 104 and the second movable plate 105 to rise or fall. The rest of this embodiment is the same as the above embodiment and will not be repeated.

[0059] Example 5:

[0060] Based on the above embodiment, this embodiment further defines the structure of the translation stage 2, such as Figure 4 As shown, the translation stage 2 includes a base 201 fixed to the lower part of the first movable plate 104, a U-shaped groove is provided in the base 201, a precision screw 202 is transversely provided in the U-shaped groove of the base 201, one end of the precision screw 202 extends out of the base 201 and is connected to a second drive motor 203, a movable platform 204 is threadedly connected to the precision screw 202 in the U-shaped groove, and guide rails 205 slidably connected to the movable platform 204 are provided on both sides of the precision screw 202 in the U-shaped groove of the base 201. The lower part of the movable platform 204 is fixedly connected to the rotating table 3, and the second drive motor 203 can drive the precision screw 202 to rotate, thereby driving the movable platform 204 threadedly connected to the precision screw 202 to slide back and forth on the guide rails 205 in the U-shaped groove of the base 201. The other parts of this embodiment are the same as those of the above embodiment and will not be repeated.

[0061] Example 6:

[0062] Based on the above embodiment, this embodiment further defines the structure of the rotating platform 3, such as Figure 5 As shown, the rotating platform 3 includes a translation base 301 fixedly connected to the mobile platform 204. A rotating platform 302 is mounted on the lower portion of the translation base 301. A third drive motor 303 is mounted on the side of the translation base 301. The third drive motor 303 drives the rotating platform 302 to rotate via a coupling 304. The structure in which the third drive motor 303 drives the rotating platform 302 via the coupling 304 is a common mechanical structure in the field. Its specific structural connection will not be detailed here. Those skilled in the art will understand the specific drive connection relationship based on mechanical knowledge. The rest of this embodiment is the same as the above embodiment and will not be repeated.

[0063] Example 7:

[0064] Based on the above embodiment, this embodiment further defines the structure of the angle table 5, such as Figure 6 As shown, the corner platform 5 includes a rotating base 501 fixedly connected to the lower portion of one side of the connecting plate 4. A pitching platform 502 is disposed below the rotating base 501. A fourth drive motor 503 is disposed at the end of the rotating base 501 to drive the pitching platform 502 to swing. The structure in which the fourth drive motor 503 drives the pitching platform 502 below the rotating base 501 to swing is a common mechanical structure in the field. Its specific structural connection will not be detailed here. Those skilled in the art will understand the specific drive connection relationship based on mechanical knowledge. The rest of this embodiment is the same as the above embodiment and will not be repeated.

[0065] Example 8:

[0066] Based on the above embodiment, this embodiment further defines the structure of the rotating platform 3, and the thickness of the connecting plate 4 and the U-shaped clamping plate 6 are both 5 mm. The rest of this embodiment is the same as the above embodiment and will not be repeated.

[0067] It can be understood that the structure of the optical path adjustment device according to an embodiment of the present invention, such as the working principles and working processes of components such as the drive motor and the laser interferometer 7, are all existing technologies and are well known to technicians in this field, and will not be described in detail here.

[0068] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for performing precision testing of CNC machine tools using an optical path adjustment device for precision testing of CNC machine tools, characterized in that: The following steps are involved: S1: Assemble an optical path adjustment device for precision detection of numerically controlled machine tools; the optical path adjustment device for precision detection of numerically controlled machine tools comprises a lifting platform (1) capable of being lifted up and down, a translation platform (2) capable of being lifted up and down along with the lifting platform (1) being fixedly installed in the lifting platform (1), a rotating platform (3) being fixedly connected to the lower portion of the translation platform (2), and the rotating platform (3) being capable of reciprocating translational motion left and right under the action of the translation platform (2); the lower portion of the rotating platform (3) being fixedly connected to an angular platform (5) via a connecting plate (4), the upper portion of one side of the connecting plate (4) being fixedly connected to the lower portion of the rotating platform (3), and the lower portion of the other side of the connecting plate (4) being fixedly connected to the angular platform (5); the connecting plate (4) being capable of being The rotating table (3) rotates under the action of the rotating table (3) and drives the angular table (5) to rotate on the lower side of the rotating table (3); the lower part of the angular table (5) is fixedly connected to a U-shaped clamping plate (6); a laser interferometer (7) is fixedly installed in a U-shaped groove on one side of the U-shaped clamping plate (6); the U-shaped clamping plate (6) can swing under the action of the angular table (5) and drive the laser interferometer (7) fixed in the U-shaped groove to swing; a mounting frame (8) is fixedly installed at the lower part of the U-shaped groove of the U-shaped clamping plate (6); an interferometer group (9) matching the position of the laser interferometer (7) is installed on the mounting frame (8); the laser emitted by the laser interferometer (7) passes through the interferometer group (9); S2: placing the lifting platform (1) in the optical path adjustment device on the machine bed (10) of the CNC machine tool to be tested, installing a reflector (17) on the head of the CNC machine tool to be tested, so that the laser interferometer (7) and the interferometer group (9) in the optical path adjustment device are kept horizontal, and then adjusting the reflector (17) installed on the head of the CNC machine tool to be tested so that the reflector (17) can reflect the laser light emitted by the laser interferometer (7) and the laser light reflected by the reflector (17) can overlap with the laser light reflected by the interferometer group (9); S3: Make the head of the CNC machine tool run according to the instructions, and at the same time control the various drive motors in the optical path adjustment device so that the laser interferometer (7) and the interference lens group (9) maintain the same running trajectory as the head. If the laser reflected by the reflector (17) can always coincide with the laser reflected by the interference lens group (9), it proves that the operation accuracy of the CNC machine tool is high. If the laser reflected by the reflector (17) deviates from the laser reflected by the interference lens group (9), the operation accuracy of the CNC machine tool needs to be adjusted.

2. The method for detecting the accuracy of a CNC machine tool according to claim 1, wherein: The CNC machine tool is a gantry CA swing head five-axis CNC machine tool, comprising a machine bed (10), an X-axis motion unit (11), a Y-axis motion unit (12), a Z-axis motion unit (13), a C-axis swing unit (14), and an A-axis swing unit (15), wherein the head of the gantry CA swing head five-axis CNC machine tool is the A-axis swing unit (15).

3. The method for detecting the accuracy of a CNC machine tool according to claim 1, wherein: The head of the numerical control machine tool is mounted with a reflector (17) via an auxiliary fixture (16), and the auxiliary fixture (16) can ensure that when the numerical control machine tool is not in operation, the laser reflected by the reflector (17) coincides with the laser reflected by the interference lens group (9).

4. The method for detecting the accuracy of a CNC machine tool according to claim 1, wherein: The lifting platform (1) comprises a first fixed plate (101) at the bottom and a second fixed plate (102) at the top, which are parallel to each other, wherein the first fixed plate (101) and the second fixed plate (102) are fixedly connected via a plurality of first optical axes (103); and further comprises a first movable plate (104) located between the first fixed plate (101) and the second fixed plate (102), and a second movable plate (105) located above the second fixed plate (102), wherein the first movable plate (104) and the second movable plate (105) are connected via a plurality of first optical axes (103) penetrating the second fixed plate ( The first movable plate (104) is fixedly connected to the second optical axis (106) of the first fixed plate (101), the entire first optical axis (103) passes through the first movable plate (104), the first movable plate (104) can move up and down on the first optical axis (103), and the second movable plate (105) is driven to move up and down by the second optical axis (106); the first fixed plate (101), the second fixed plate (102), the first movable plate (104), and the second movable plate (105) are all parallel to each other, and the first optical axis (103) and the second optical axis (106) are both perpendicular to the plane where the first movable plate (104) is located.

5. The method for detecting the accuracy of a CNC machine tool according to claim 4, wherein: The lifting platform (1) also includes a first driving motor (107) installed on the second movable plate (105), and a vertical lead screw (108) is provided between the second movable plate (105) and the first movable plate (104), the lower end of the lead screw (108) is connected to the lead screw bearing (109) installed on the first movable plate (104), and the other end is connected to the first driving motor (107); a lead screw nut (110) is provided on the second fixed plate (102), and the lead screw (108) passes through the second fixed plate (102) through the lead screw nut (110); the first driving motor (107) has a built-in reducer module, and the first driving motor (107) can drive the lead screw (108) to rotate, thereby driving the first movable plate (104) and the second movable plate (105) to rise or fall.

6. The method for detecting the accuracy of a CNC machine tool according to claim 4 or 5, characterized in that: The translation stage (2) includes a base (201) fixed to the lower part of the first movable plate (104), a U-shaped groove is provided in the base (201), a precision screw (202) is transversely provided in the U-shaped groove of the base (201), one end of the precision screw (202) extends out of the base (201) and is connected to a second drive motor (203), a movable platform (204) is threadedly connected to the precision screw (202) in the U-shaped groove, guide rails (205) slidably connected to the movable platform (204) are provided on both sides of the precision screw (202) in the U-shaped groove of the base (201), the lower part of the movable platform (204) is fixedly connected to the rotating table (3), the second drive motor (203) can drive the precision screw (202) to rotate, and then drive the movable platform (204) threadedly connected to the precision screw (202) to slide back and forth on the guide rail (205) in the U-shaped groove of the base (201).

7. The method for detecting the accuracy of a CNC machine tool according to claim 6, wherein: The rotating platform (3) comprises a translation base (301) fixedly connected to the mobile platform (204), a rotating platform (302) is installed at the lower part of the translation base (301), and a third drive motor (303) is installed on the side of the translation base (301), and the third drive motor (303) drives the rotating platform (302) to rotate through a coupling (304).

8. The method for detecting the accuracy of a CNC machine tool according to claim 1, wherein: The corner platform (5) comprises a rotating base (501) fixedly connected to the lower portion of one side of the connecting plate (4), a pitching platform (502) being provided at the lower portion of the rotating base (501), and a fourth driving motor (503) for driving the pitching platform (502) to swing being provided at the end of the rotating base (501).

9. The method for detecting the accuracy of a CNC machine tool according to claim 1, wherein: The thickness of the connecting plate (4) and the U-shaped clamping plate (6) are both 5 mm.

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