Machine center correction system and correction method

Abstract

The machining center correction system and correction method, the correction system includes: the correction fixture, the correction block one, the correction block two and the correction block three, the correction block one is the cuboid structure, the correction block two is the cylinder structure, the correction block three is the square structure, three are fixedly connected, coaxial arrangement; dial gauge and edge finder, are auxiliary correction gauge; driving shaft, is used for clamping correction gauge, drives correction gauge to move. The correction method includes the correction of three-axis machining center and five-axis machining center, connects the correction fixture on the quick change plate of machining center, cooperates with dial gauge, edge finder and other gauges, corrects the parallelism, flatness and C-axis concentricity of quick change plate, and corrects the working coordinates of X-axis, Y-axis, A-axis and C-axis. The beneficial effects of the present application are that the correction fixture structure is simple, can be adapted to three-axis machining center and five-axis machining center correction, and can complete all correction work at one time, without repeated disassembly, convenient operation, high correction precision.

Description

Technical Field

[0001] This invention relates to the field of calibration fixtures and calibration methods, and more specifically to a calibration system and calibration method for a machining center. Background Technology

[0002] Before machining, the workpiece needs to be fixed to the quick-change plate of the machining center using a fixture. This quick-change plate is fixedly connected to the worktable of the machining center and is used to support the workpiece to be machined. A cutting tool is connected to the spindle of the machining center, and the spindle drives the cutting tool to machine the workpiece. Because the machining of the workpiece requires extremely high precision, and there will be errors between the actual coordinates of the quick-change plate and the working coordinates of the machining center, such as unevenness of the quick-change plate or coordinate misalignment, a calibration fixture is usually used to perform overall calibration of the coordinates of the quick-change plate (i.e., the machining center) before machining, thereby eliminating coordinate errors between the quick-change plate, the workpiece, and the machining center.

[0003] Existing calibration fixtures have the problem of limited calibration functions. Therefore, multiple pieces of equipment need to be repeatedly disassembled to achieve the required calibration function. They cannot achieve the function of a single calibration fixture calibrating different machining centers, resulting in cumbersome production processes and wasted manpower, which is not conducive to daily processing and use. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a machining center calibration system and calibration method.

[0005] The objective of this invention is achieved through the following technical solution.

[0006] Machining center calibration system, suitable for calibration of three-axis machining centers and five-axis machining centers, including:

[0007] A calibration fixture is connected to the quick-change plate of the machining center. The calibration fixture includes a calibration block one and a calibration block two. The calibration block one has a cuboid structure, and the calibration block two has a cylindrical structure. The calibration block two is fixedly connected to the top surface of the calibration block one.

[0008] A dial indicator, comprising a probe and a dial, wherein the probe of the dial indicator moves against the top and side surfaces of the first calibration block to calibrate the parallelism and flatness of the quick-change plate, or to calibrate the working coordinates of the A-axis and C-axis of the machining center; the probe of the dial indicator rotates in a circular motion against the side surface of the second calibration block to calibrate the concentricity of the machining center, or to calibrate the working coordinates of the X-axis and Y-axis of the machining center.

[0009] A drive shaft is used to clamp the dial indicator and drive the dial indicator to move.

[0010] Furthermore, the calibration fixture also includes a calibration block three, which is a cube structure and is fixedly connected to the top surface of the calibration block two. The calibration block one, the calibration block two, and the calibration block three are coaxial and integrally formed.

[0011] Furthermore, the machining center calibration system also includes an edge finder connected to the drive shaft. The probe of the edge finder contacts the side of the calibration block three to calibrate the working coordinates of the X-axis and Y-axis of the machining center; the probe of the edge finder contacts the top surface of the calibration block three to calibrate the working coordinates of the Z-axis rotation center of the machining center.

[0012] A calibration method for a three-axis machining center, employing a machining center calibration system, is performed according to the following steps:

[0013] The flatness of the quick-change plate is corrected by placing the correction fixture on the quick-change plate of the three-axis machining center, so that the probe of the dial indicator abuts against the top surface of the correction block. The drive shaft drives the probe of the dial indicator to move along the X-axis and Y-axis. The vertical position of the quick-change plate is manually adjusted until the dial indicator needle remains stationary during the movement along the X-axis and Y-axis.

[0014] To correct the parallelism of the quick-change plate, the probe of the dial indicator is brought into contact with the long side of the correction block and moved along the X-axis. The horizontal position of the quick-change plate is manually adjusted until the dial indicator needle does not move, so that the long side of the correction block is parallel to the X-axis of the machining center. Then the quick-change plate is fixed.

[0015] Furthermore, after fixing the quick-change plate one, the working coordinates of the X-axis and Y-axis of the machining center are corrected, specifically including: using the edge finder to divide the correction block three into four sides to obtain the coordinate values ​​of the X-axis and Y-axis, and recording the current X-axis and Y-axis values ​​of the machine coordinates into the working coordinate origin.

[0016] Furthermore, the method for obtaining the working coordinates of the X-axis and Y-axis also includes: using the edge finder to take data from one side of the side of the correction block three in the X-axis and Y-axis directions respectively, adding half the side length of the correction block three and the radius of the edge finder to the obtained values ​​to obtain the coordinate values ​​of the X-axis and Y-axis, and recording the current X-axis and Y-axis values ​​of the machine coordinates into the origin of the working coordinates.

[0017] A calibration method for a five-axis machining center, employing a calibration system for the machining center, is performed according to the following steps:

[0018] The flatness of the quick-change plate 2 is corrected by placing the correction fixture on the quick-change plate 2 of the five-axis machining center, so that the probe of the dial indicator abuts against the top surface of the correction block 1, and the drive shaft drives the probe of the dial indicator to move along the X-axis and Y-axis. The vertical position of the quick-change plate 2 is manually adjusted until the dial indicator needle remains stationary during the movement along the X-axis and Y-axis.

[0019] To calibrate the working coordinates of the machining center A-axis, the probe of the dial indicator is placed against the top surface of the calibration block and moved along the Y-axis. In manual mode, the machining center A-axis is rotated so that the Y-axis direction of the top surface of the calibration block is parallel to the Y-axis of the machining center, and the coordinate A-axis value is obtained. The current mechanical coordinate A-axis value is then stored in the working coordinate origin.

[0020] To calibrate the concentricity of the C-axis of the machining center, the probe of the dial indicator is placed against the side wall of the calibration block two. The C-axis of the machining center is rotated, and the dial indicator makes a circular motion around the side wall of the calibration block two. The position of the quick-change plate two is manually adjusted until the circular runout of the dial indicator is zero, thus completing the concentricity calibration of the quick-change plate two and the C-axis of the machining center. Then, the quick-change plate two is fixed.

[0021] Furthermore, after fixing the second quick-change plate, the working coordinates of the machining center are corrected, specifically including:

[0022] To calibrate the C-axis working coordinate of the machining center, the probe of the dial indicator is placed against the side of the calibration block and moved along the X-axis. In manual mode, the C-axis of the machining center is rotated so that the side of the calibration block is parallel to the X-axis of the machining center to obtain the C-axis coordinate value. The current mechanical coordinate C-axis value is then stored at the origin of the working coordinate.

[0023] The X-axis and Y-axis working coordinates of the machining center are calibrated by having the probe of the dial indicator abut against the side wall of the calibration block two. The X-axis and Y-axis of the machining center are moved so that the dial indicator needle remains stationary at the C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees positions. The X-axis and Y-axis coordinate values ​​are obtained, and the current X-axis and Y-axis values ​​of the machine coordinates are stored in the working coordinate origin.

[0024] To calibrate the working coordinates of the Z-axis rotation center of the machining center, the equipment is adjusted to MDI mode. The A-axis of the machining center is rotated 90 degrees, and the Y-axis and Z-axis are manually moved so that the probe of the edge finder touches the top surface of the calibration block three to obtain the absolute Y-axis value. The Z-axis rotation center coordinates of the machining center are calculated using the absolute Y-value, and the Z-axis rotation center coordinates are stored in the working coordinate origin.

[0025] Furthermore, the method for calibrating the X-axis and Y-axis working coordinates of the machining center includes the following calibration steps: In the manual mode of the machining center, the probe of the dial indicator is brought against the side wall of the calibration block two, specifically at the positions of C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees; then the X-axis is moved using the handwheel until the dial indicator's measurement results are the same at the C-axis 90 degree and C-axis 270 degree positions; the Y-axis is moved again using the handwheel until the dial indicator's measurement results are the same at the C-axis 0 degree and C-axis 180 degree positions; then the X-axis and Y-axis are checked to ensure that the dial indicator's measurement results are the same at all four positions: C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees; finally, the current X-axis and Y-axis values ​​of the machine coordinates are stored at the working coordinate origin.

[0026] Furthermore, the calculation method for the working coordinate of the Z-axis rotation center of the machining center is as follows: The radius of the edge finder, the height of the first correction block, the height of the second correction block, the height of the third correction block, and the thickness of the second quick-change plate are sequentially added to the measured absolute Y-axis value. The resulting value is the height of the Z-axis rotation center. When the A-axis of the machining center is rotated -90 degrees in MDI mode, the radius of the edge finder, the height of the first correction block, the height of the second correction block, the height of the third correction block, and the thickness of the second quick-change plate are sequentially subtracted from the measured absolute Y-axis value. The resulting value is the working coordinate of the Z-axis rotation center.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention provides a calibration fixture made by coaxially stacking calibration tools of different structures. This calibration fixture can be adapted to the setting requirements of three-axis and five-axis machining centers and has the characteristics of simple structure. When used with dial indicators and edge finders, it can calibrate the parallelism, flatness, and concentricity with the C-axis of the quick-change plate in one go, as well as calibrate the working coordinates of the X-axis, Y-axis, A-axis, and C-axis of the machining center. The calibration method avoids the problem of repeatedly disassembling and installing the calibration fixture from the quick-change plate. The overall structure of the solution is simple, easy to operate, and has high calibration accuracy, which can meet production needs and is suitable for widespread use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 ;

[0032] Figure 4This is a schematic diagram of the structure of the present invention. Figure 4 ;

[0033] Figure 5 This is a schematic diagram of the flatness correction of the three-axis machining center according to the present invention;

[0034] Figure 6 This is a schematic diagram of the parallelism correction of the three-axis machining center according to the present invention;

[0035] Figure 7 This is a schematic diagram of the X-axis and Y-axis working coordinate correction of the three-axis machining center of the present invention;

[0036] Figure 8 This is a schematic diagram of the flatness correction of the five-axis machining center according to the present invention;

[0037] Figure 9 This is a schematic diagram of the A-axis working coordinate correction of the five-axis machining center according to the present invention;

[0038] Figure 10 This is a side view of the C-axis concentricity correction of the five-axis machining center according to the present invention;

[0039] Figure 11 This is a schematic diagram of the C-axis working coordinate correction of the five-axis machining center according to the present invention;

[0040] Figure 12 This is a schematic diagram of the X-axis and Y-axis working coordinate correction of the five-axis machining center of the present invention;

[0041] Figure 13 This is a side view of the Z-axis rotation center working coordinate correction of the five-axis machining center according to the present invention;

[0042] In the diagram: 1. Correction block one;

[0043] 2. Correction Block Two;

[0044] 3. Correction Block Three;

[0045] 4. Connector; 41. First rivet; 42. Second rivet;

[0046] 5. Handle;

[0047] 6. Dial gauge;

[0048] 7. Edge finder;

[0049] 8. Quick-change plate one;

[0050] 9. Quick-change plate two. Detailed Implementation

[0051] The technical solution of the present invention will be further described below through specific embodiments.

[0052] Example

[0053] Machining center calibration system, suitable for calibration of three-axis machining centers and five-axis machining centers, such as... Figure 1-13 As shown, the system includes: a calibration fixture connected to the quick-change plate of the machining center; the calibration fixture comprising calibration block 1 and calibration block 2, wherein calibration block 1 is a cuboid structure and calibration block 2 is a cylindrical structure, and calibration block 2 is fixedly connected to the top surface of calibration block 1; a dial indicator 6 comprising a probe and a dial; the probe of dial indicator 6 abuts against the top and side surfaces of calibration block 1 and moves to calibrate the parallelism and flatness of the quick-change plate, or to calibrate the working coordinates of the A-axis and C-axis of the machining center; the probe of dial indicator 6 abuts against the side surface of calibration block 2 and rotates circumferentially to calibrate the concentricity of the machining center, or to calibrate the working coordinates of the X-axis and Y-axis of the machining center; and a drive shaft for clamping dial indicator 6 and driving dial indicator 6 to move.

[0054] The machining center calibration system in this embodiment has a simple calibration fixture structure, but with the help of a dial indicator, it can complete the calibration of flatness, parallelism and working coordinates in one go without repeated disassembly, making it easy to operate and with high calibration accuracy.

[0055] In this embodiment, the calibration fixture further includes a third calibration block 3, which is a cube structure and is fixedly connected to the top surface of the second calibration block 2. Preferably, the first calibration block 1, the second calibration block 2, and the third calibration block 3 are coaxial and integrally formed. Any one edge of the first calibration block 1 is parallel to at least two edges of the third calibration block 3.

[0056] In this embodiment, the machining center calibration system also includes an edge finder 7. Similarly, the edge finder 7 is fixedly connected to the drive shaft, and the drive shaft can drive the edge finder 7 to move. The probe of the edge finder 7 contacts the side of the calibration block 3 to calibrate the working coordinates of the X-axis and Y-axis of the machining center; the probe of the edge finder 7 contacts the top surface of the calibration block 3 to calibrate the working coordinates of the Z-axis rotation center of the machining center.

[0057] In this embodiment, the bottom of the correction block 1 is provided with a detachable connector 4. The connector 4 includes a first rivet 41 and a second rivet 42. Specifically, there are multiple first rivets 41 and multiple second rivets 42. The multiple first rivets 41 are arranged along the circumference of the first circle, and the multiple second rivets 42 are arranged along the circumference of the second circle. The first circle and the second circle are concentrically arranged.

[0058] Specifically, the calibration fixture can be optionally mounted on the quick-change plate 8 of a three-axis machining center via the first pull stud 41, and the calibration fixture can be optionally mounted on the quick-change plate 9 of a five-axis machining center via the second pull stud 42. The quick-change plate is fixedly connected to the bottom of the machine tool machining center and is used to support the workpiece to be processed.

[0059] In this embodiment, the side wall of the calibration block 1 is provided with handles 5, and there are two handles 5. The handles 5 are symmetrically arranged on the side wall of the calibration block 1, and the calibration fixture can be moved by means of the handles 5.

[0060] In this embodiment, the specific steps for the calibration of the three-axis machining center are described in [reference needed]. Figure 5-7 :

[0061] S1. Correct the flatness of the quick-change plate (8). See [link / reference] Figure 5 Place the calibration fixture on the quick-change plate 8 of the three-axis machining center, so that the probe of the dial indicator 6 abuts against the top surface of the calibration block 1. Drive the drive shaft to move the probe of the dial indicator 6 along the X-axis and Y-axis. Manually adjust the vertical position of the quick-change plate 8 until the dial indicator 6 keeps the needle stationary during the movement along the X-axis and Y-axis.

[0062] S2. Correct the parallelism of the quick-change plate -8. (See below) Figure 6 Place the probe of dial indicator 6 against the long side of calibration block 1 and move it along the X-axis. Manually adjust the horizontal position of quick change plate 8 until the dial indicator 6 needle does not move, so that the long side of calibration block 1 is parallel to the X-axis of the machining center. Then fix quick change plate 8.

[0063] S3. Correct the working coordinates of the X and Y axes of the machining center. (See below) Figure 7 Specifically, this includes: using the edge finder 7 to center the correction block 3 on all four sides, obtaining the coordinate values ​​of the X and Y axes, and recording the current X and Y axis values ​​of the machine coordinates into the origin of the working coordinates. Optionally, the method for obtaining the working coordinates of the X and Y axes also includes: using the edge finder 7 to take data from one side of the correction block 3 in the X and Y axis directions respectively, adding half the side length of the correction block 3 and the radius of the edge finder 7 to the obtained values ​​to obtain the working coordinates of the X and Y axes.

[0064] In this embodiment, the specific steps for the calibration of the five-axis machining center are described in [reference needed]. Figure 8-13 :

[0065] S1. Correct the flatness of the quick-change plate 29. (See below) Figure 8 Place the calibration fixture on the quick-change plate 29 of the five-axis machining center, so that the probe of the dial indicator 6 abuts against the top surface of the calibration block 1. Drive the drive shaft to move the probe of the dial indicator 6 along the X-axis and Y-axis. Manually adjust the vertical position of the quick-change plate 29 until the dial indicator 6 keeps the needle stationary during the movement along the X-axis and Y-axis.

[0066] S2. Correct the working coordinates of the A-axis of the machining center. (See below) Figure 9Place the probe of dial indicator 6 against the top surface of calibration block 1 and move it along the Y-axis. In manual mode, rotate the A-axis of the machining center so that the Y-axis of the top surface of calibration block 1 is parallel to the Y-axis of the machining center to obtain the coordinate A-axis value. Store the current machine coordinate A-axis value into the working coordinate origin.

[0067] S3. Correct the concentricity of the C-axis of the machining center. (See below) Figure 10 Place the probe of dial indicator 6 against the side wall of calibration block 2, rotate the C-axis of the machining center, and dial indicator 6 will make a circular motion around the side wall of calibration block 2. Manually adjust the position of quick change plate 9 until the circular runout of dial indicator 6 is zero, thus completing the concentricity calibration of quick change plate 9 and the C-axis of the machining center. Then fix quick change plate 9.

[0068] S4. Correct the C-axis working coordinates of the machining center. (See below) Figure 11 Place the probe of dial indicator 6 against the side of calibration block 1 and move it along the X-axis. In manual mode, rotate the C-axis of the machining center so that the side of calibration block 1 is parallel to the X-axis of the machining center to obtain the coordinate C-axis value. Store the current machine coordinate C-axis value into the working coordinate origin.

[0069] S5. Correct the working coordinates of the X and Y axes of the machining center. (See below) Figure 12 Make the probe of dial indicator 6 abut against the side wall of calibration block 2, move the X and Y axes of the machining center, so that the pointer of dial indicator 6 remains stationary when it is at the C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees, obtain the X and Y axis coordinate values, and store the current X and Y axis values ​​of the machine coordinates into the working coordinate origin.

[0070] Specifically, the method for calibrating the working coordinates of the X-axis and Y-axis of the machining center includes the following calibration steps: In the manual mode of the machining center, the probe of the dial indicator 6 is pressed against the side wall of the calibration block 2, specifically at the positions of C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees; then the X-axis is moved using the handwheel so that the dial indicator 6 has the same measurement result at the C-axis 90 degree position and the C-axis 270 degree position; the Y-axis is moved again using the handwheel so that the dial indicator (6) has the same measurement result at the C-axis 0 degree position and the C-axis 180 degree position; then the X-axis and Y-axis are checked so that the measurement results of the dial indicator 6 are the same at the four positions of C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees.

[0071] S6. Correct the working coordinates of the Z-axis rotation center of the machining center. (See below) Figure 13Adjust the device to MDI mode, input and execute "G90G00G54X0Y0A90C0;M03S500" to rotate the A-axis of the machining center by 90 degrees, manually move the Y-axis and Z-axis so that the probe of the edge finder 7 touches the top surface of the correction block 3, and obtain the absolute coordinate Y-axis value. Use the absolute coordinate Y value to calculate the rotation center coordinate of the machining center Z-axis, and store the rotation center coordinate value of the Z-axis in the working coordinate origin.

[0072] Specifically, the calculation method for the working coordinate of the Z-axis rotation center of the machining center is as follows: add the radius of the edge finder 7, the height of the first correction block 1, the height of the second correction block 2, the height of the third correction block 3, and the thickness of the quick-change fixture 9 to the Y-value of the measured absolute coordinate in sequence. The resulting value is the working coordinate of the Z-axis rotation center. When "A90" is changed to "-A90" in MDI mode, subtract the radius of the edge finder 7, the height of the first correction block 1, the height of the second correction block 2, the height of the third correction block 3, and the thickness of the quick-change fixture 9 from the Y-axis value of the measured absolute coordinate in sequence. The resulting value is the working coordinate of the Z-axis center.

[0073] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

[0074] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A machining center correction system, characterized by, Calibration applicable to three-axis machining centers and five-axis machining centers, including: A calibration fixture is connected to the quick-change plate of the machining center. The calibration fixture includes a calibration block one (1) and a calibration block two (2). The calibration block one (1) is a cuboid structure, and the calibration block two (2) is a cylindrical structure. The calibration block two (2) is fixedly connected to the top surface of the calibration block one (1). A dial indicator (6) includes a probe and a dial. The probe of the dial indicator (6) moves against the top and side surfaces of the first calibration block (1) to correct the parallelism and flatness of the quick-change plate, or to correct the working coordinates of the A-axis and C-axis of the machining center. The probe of the dial indicator (6) rotates in a circular motion against the side surface of the second calibration block (2) to correct the concentricity of the machining center, or to correct the working coordinates of the X-axis and Y-axis of the machining center. A drive shaft is used to clamp the dial indicator (6) and drive the dial indicator (6) to move; The correction fixture also includes a correction block three (3), which is a cube structure. The correction block three (3) is fixedly connected to the top surface of the correction block two (2). The correction block one (1), the correction block two (2) and the correction block three (3) are coaxial and integrally formed. It also includes an edge finder (7), which is connected to the drive shaft. The probe of the edge finder (7) contacts the side of the correction block three (3) to correct the working coordinates of the X-axis and Y-axis of the machining center. The probe of the edge finder (7) contacts the top surface of the correction block three (3) to correct the working coordinates of the Z-axis rotation center of the machining center.

2. A method of correcting a three-axis machining center, characterized by, The machining center calibration system according to claim 1 is used in accordance with the following steps: The flatness of the quick-change plate (8) is corrected. The correction fixture is placed on the quick-change plate (8) of the three-axis machining center, so that the probe of the dial indicator (6) abuts against the top surface of the correction block (1). The drive shaft drives the probe of the dial indicator (6) to move along the X-axis and Y-axis. The vertical position of the quick-change plate (8) is manually adjusted until the dial indicator (6) keeps the needle stationary during the movement along the X-axis and Y-axis. To correct the parallelism of the quick-change plate (8), the probe of the dial indicator (6) is brought into contact with the long side of the correction block (1) and moved along the X-axis. The horizontal position of the quick-change plate (8) is manually adjusted until the dial indicator (6) needle does not move, so that the long side of the correction block (1) is parallel to the X-axis of the machining center. Then the quick-change plate (8) is fixed. After fixing the quick-change plate (8), the working coordinates of the X and Y axes of the machining center are corrected, specifically including: Using the edge finder (7) to divide the correction block three (3) on four sides, the coordinate values ​​of the X-axis and Y-axis are obtained, and the X-axis and Y-axis values ​​of the current machine coordinates are entered into the working coordinate origin.

3. The correction method of a three-axis machining center according to claim 2, characterized in that, The method for obtaining the working coordinates of the X-axis and Y-axis further includes: using the edge finder (7) to take the values ​​of one side of the side of the correction block three (3) in the X-axis and Y-axis directions respectively, adding half the side length of the correction block three (3) and the radius of the edge finder (7) to obtain the coordinate values ​​of the X-axis and Y-axis, and recording the values ​​of the current mechanical coordinates of the X-axis and Y-axis into the origin of the working coordinates.

4. A calibration method for a five-axis machining center, characterized in that, The machining center calibration system according to claim 1 is used in accordance with the following steps: The flatness of the quick-change plate 2 (9) is corrected. The correction fixture is placed on the quick-change plate 2 (9) of the five-axis machining center, so that the probe of the dial indicator (6) abuts against the top surface of the correction block 1 (1). The drive shaft drives the probe of the dial indicator (6) to move along the X-axis and Y-axis. The vertical position of the quick-change plate 2 (9) is manually adjusted until the dial indicator (6) keeps the needle stationary during the movement along the X-axis and Y-axis. To calibrate the working coordinates of the A-axis of the machining center, the probe of the dial indicator (6) is placed against the top surface of the calibration block (1) and moved along the Y-axis. In manual mode, the A-axis of the machining center is rotated so that the Y-axis direction of the top surface of the calibration block (1) is parallel to the Y-axis of the machining center, and the coordinate A-axis value is obtained. The current mechanical coordinate A-axis value is stored in the working coordinate origin. To calibrate the concentricity of the C-axis of the machining center, the probe of the dial indicator (6) is brought into contact with the side wall of the calibration block 2 (2). The C-axis of the machining center is rotated. At this time, the dial indicator (6) makes a circular motion around the side wall of the calibration block 2 (2). The position of the quick change plate 2 (9) is manually adjusted until the circular runout of the dial indicator (6) is zero. This completes the concentricity calibration of the quick change plate 2 (9) and the C-axis of the machining center. Then, the quick change plate 2 (9) is fixed.

5. The calibration method for a five-axis machining center according to claim 4, characterized in that, After fixing the quick-change plate two (9), the working coordinates of the machining center are corrected, specifically including: To calibrate the working coordinates of the C-axis of the machining center, the probe of the dial indicator (6) is placed against the side of the calibration block (1) and moved along the X-axis. In manual mode, the C-axis of the machining center is rotated so that the side of the calibration block (1) is parallel to the X-axis of the machining center, and the coordinate C-axis value is obtained. The current mechanical coordinate C-axis value is stored in the working coordinate origin. The X-axis and Y-axis working coordinates of the machining center are calibrated so that the probe of the dial indicator (6) abuts against the side wall of the calibration block 2 (2). The X-axis and Y-axis of the machining center are moved so that the dial indicator (6) remains stationary when the pointer is at the C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees. The X-axis and Y-axis coordinate values ​​are obtained, and the current X-axis and Y-axis values ​​of the machine coordinates are stored in the working coordinate origin. The working coordinates of the Z-axis rotation center of the machining center are corrected. The equipment is adjusted to MDI mode, the A-axis of the machining center is rotated 90 degrees, and the Y-axis and Z-axis are manually moved so that the probe of the edge finder (7) touches the top surface of the correction block three (3) to obtain the absolute coordinate Y-axis value. The Z-axis rotation center coordinates of the machining center are calculated using the absolute coordinate Y value, and the Z-axis rotation center coordinate value is stored in the working coordinate origin.

6. The calibration method for a five-axis machining center according to claim 5, characterized in that, The method for calibrating the working coordinates of the X-axis and Y-axis of a machining center includes the following steps: In the manual mode of the machining center, the probe of the dial indicator (6) is brought against the side wall of the calibration block 2 (2), specifically at the positions of C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees; then the X-axis is moved using the handwheel so that the dial indicator (6) measures the same result at the C-axis 90 degree position and the C-axis 270 degree position; the Y-axis is moved again using the handwheel so that the dial indicator (6) measures the same result at the C-axis 0 degree position and the C-axis 180 degree position; then the X-axis and Y-axis are checked so that the measurement results of the dial indicator (6) are the same at the four positions of C-axis 0 degrees, C-axis 90 degrees, C-axis 180 degrees, and C-axis 270 degrees; finally, the current X-axis and Y-axis values ​​of the machine coordinates are stored in the working coordinate origin.

7. The calibration method for a five-axis machining center according to claim 5, characterized in that, The method for calculating the working coordinates of the Z-axis rotation center of a machining center is as follows: The Z-axis rotation center height is obtained by adding the radius of the edge finder (7), the height of the first correction block (1), the height of the second correction block (2), the height of the third correction block (3), and the thickness of the second quick-change plate (9) to the Y-value of the measured absolute coordinates in sequence. When the A-axis of the machining center is rotated -90 degrees in MDI mode, the radius of the edge finder (7), the height of the first correction block (1), the height of the second correction block (2), the height of the third correction block (3), and the thickness of the second quick-change plate (9) are subtracted from the Y-axis value of the measured absolute coordinates in sequence.

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