Numerical control machine tool precision correction device and correction method

Abstract

The invention discloses a numerical control machine tool precision correction device and method.The device comprises a lower mounting structure, a first power mechanism, an upper mounting structure, a second power mechanism and a calibration rod, and the lower mounting structure comprises an adjustable base, a mounting base and a rotary base; the first power mechanism is mounted in a lower mounting cavity defined by the adjustable base, the mounting seat and the rotary seat, and a first monitoring unit is arranged in the lower mounting cavity; the second power mechanism is mounted in an upper mounting cavity of the upper mounting structure, and the bottom of the calibration rod is in transmission connection with the second power mechanism; and a second monitoring unit is arranged in the upper mounting cavity. The first power mechanism drives the calibration rod to rotate horizontally, the second power mechanism drives the calibration rod to swing up and down with the bottom of the calibration rod as the center, the first monitoring unit and the second monitoring unit are used for monitoring the rotation angle and the swing angle and accurately determining the position of the calibration rod, then all shafts of the numerical control machine tool are achieved, operation is simple, and efficiency is high. And the calibration efficiency and the calibration precision are improved.

Description

Technical Field

[0001] The invention relates to the field of precision correction of numerically controlled machine tools, and in particular to a precision correction device and a correction method for numerically controlled machine tools. Background Art

[0002] Each moving axis of a large CNC machine tool is based on the worktable to establish relative coordinates. At the same time, a semi-closed loop or closed loop detection position is established on each axis using a grating ruler to ensure the machining accuracy of the machine tool. During the operation, due to machining forces, foundation settlement, machine tool relocation, external force collision and other reasons, the axes of the machine tool change irregularly relative to the plane and center of the machine tool worktable. These irregular changes lead to a decrease in the machining accuracy of the machine tool, and even cause the product to be scrapped. Therefore, it is very important to perform precision calibration on each moving axis of the machine tool regularly or irregularly. At present, the calibration of CNC machine tools is mainly carried out with the help of single tools such as spirit levels, spirit levels, and squares. These measuring tools need to cooperate with each other during the calibration process, which is cumbersome to operate, with large measurement errors and incomplete calibration. The calibration effect is not ideal, which still affects the machining accuracy. Summary of the invention

[0003] In view of this, the first object of the present invention is to propose a CNC machine tool precision correction device, and the second object of the present invention is to provide a CNC machine tool precision correction method.

[0004] To achieve the above object, the present invention adopts the following technical solutions: The CNC machine tool precision correction device of the present invention comprises a lower mounting structure, a first power mechanism, an upper mounting structure, a second power mechanism and a calibration rod driven by the second power mechanism; The lower mounting structure includes an adjustable base, a mounting seat arranged on the adjustable base, and a swivel seat arranged on the mounting seat, the first power mechanism is installed in a lower mounting cavity surrounded by the adjustable base, the mounting seat and the swivel seat, and a first monitoring unit for monitoring the position of the swivel seat is arranged in the lower mounting cavity; The upper mounting structure is mounted on the swivel seat, and the upper mounting structure has an upper mounting cavity, the second power mechanism is mounted in the upper mounting cavity, the bottom of the calibration rod is transmission-connected with the second power mechanism, and an adjustment hole matching the calibration rod is provided on the top plate of the upper mounting structure; a second monitoring unit for monitoring the position of the calibration rod is provided in the upper mounting cavity; The signal output terminals of the first monitoring unit and the second monitoring unit are both connected to the signal input terminal of the controller, and the display signal output terminal of the controller is connected to the signal input terminal of the display screen.

[0005] The beneficial effects are as follows: the calibration rod of the present invention provides a measurement reference for the micrometer, the first power mechanism can drive the calibration rod to rotate horizontally through the swivel seat to adjust the measurement reference position; the second power mechanism can drive the calibration rod to swing up and down with its bottom as the center, the first monitoring unit and the second monitoring unit are used to monitor the rotation angle of the swivel seat and the swing angle of the calibration rod respectively, and the position of the calibration rod can be accurately determined to ensure the accuracy of the measurement reference. The present invention combined with the micrometer can realize the precision measurement of each axis of the CNC machine tool (single-axis measurement, two-to-two combined linkage measurement, or three-axis linkage measurement) and the workbench, the operation is simple, and the calibration efficiency and calibration accuracy are improved.

[0006] Preferably, a support platform is provided above the side wall of the mounting seat, the swivel seat is arranged on the support platform, and the swivel seat and the inner wall of the mounting seat are in clearance fit; a pressure cover is provided on the top of the side wall of the mounting seat, the pressure cover extends to the edge of the swivel seat, and the pressure cover and the swivel seat are in clearance fit. The pressure cover of the present invention can limit the swivel seat, ensure the high-precision rotation of the swivel seat, and ensure the horizontal rotation accuracy of the calibration rod.

[0007] Preferably, the first power mechanism includes a first worm and a first worm wheel meshed with the first worm, a stepped shaft is provided at the bottom center of the swivel seat, the first worm wheel is coaxially mounted on the stepped shaft, and the first worm wheel is mounted on a first support provided on the adjustable base. When working, the first worm wheel can be rotated by rotating the first worm, thereby driving the swivel seat and the calibration rod to rotate synchronously, and the operation is simple.

[0008] Preferably, the first monitoring unit includes a first magnetic grating and a first reading head matched with the first magnetic grating, wherein the first magnetic grating is mounted at the edge of the bottom surface of the rotary seat and is used to obtain the position of the first worm gear; the first reading head is mounted on a mounting seat close to the first magnetic grating. During the rotation of the rotary seat, the first reading head can read the first magnetic grating at the bottom of the rotary seat and determine the rotation angle of the rotary seat.

[0009] Preferably, the second power mechanism includes a second worm and a second worm wheel meshing with the second worm, a second support and a third support are arranged on the top of the swivel seat, and the second worm is rotatably arranged on the second support; the lower part of the calibration rod extends into the upper mounting chamber, and a horizontal connecting shaft is fixedly connected to the lower part thereof, the left end of the connecting shaft is inserted into the third support and is loosely matched with the third support, the second worm wheel is coaxially arranged on the right end of the connecting shaft, and a fastening nut is screwed on the right end of the connecting shaft. During operation, since the central axis of the second worm wheel is arranged horizontally, it can drive the calibration rod to rotate around the central axis of the connecting shaft, so that the calibration rod can be switched arbitrarily between a horizontal state, a vertical state and an inclined state.

[0010] Preferably, the second monitoring unit includes a second magnetic grating and a second reading head matching the second magnetic grating, the second magnetic grating is installed on the right side of the second worm gear for obtaining the position of the second worm gear; the second reading head is installed near the second magnetic grating.

[0011] Preferably, the ends of the first worm and the second worm are provided with mounting holes for matching with the manual crank. The calibration rod adjustment requires high precision, and a slow adjustment is adopted during adjustment, and the manual crank is used to drive the first worm and the second worm to rotate, thereby achieving fine adjustment of the calibration rod.

[0012] Preferably, the upper mounting structure includes a shell disposed on the swivel seat. The shell, base and mounting seat of the present invention are combined so that the first power mechanism and the second power mechanism are both located in the mounting cavity, making the present invention beautiful and portable as a whole and convenient for calibration.

[0013] The present invention also provides a method for calibrating the precision of a numerically controlled machine tool, which uses a device for calibrating the precision of a numerically controlled machine tool, the device comprising a lower mounting structure, a first power mechanism, an upper mounting structure, a second power mechanism, and a calibration rod driven by the second power mechanism; The lower mounting structure includes an adjustable base, a mounting seat arranged on the adjustable base, and a swivel seat arranged on the mounting seat, the first power mechanism is installed in a lower mounting cavity surrounded by the adjustable base, the mounting seat and the swivel seat, the first power mechanism is arranged in the lower mounting cavity, and a first monitoring unit for monitoring the position of the swivel seat is arranged in the lower mounting cavity; The upper mounting structure is mounted on the swivel seat, and the upper mounting structure has an upper mounting cavity, the second power mechanism is mounted in the upper mounting cavity, the bottom of the calibration rod is transmission-connected with the second power mechanism, and an adjustment hole matching the calibration rod is provided on the top plate of the upper mounting structure; a second monitoring unit for monitoring the position of the calibration rod is provided in the upper mounting cavity; The signal output terminals of the first monitoring unit and the second monitoring unit are both connected to the signal input terminal of the controller, and the display signal output terminal of the controller is connected to the signal input terminal of the display screen; The method includes correction of X-axis accuracy, correction of Y-axis accuracy and correction of Z-axis accuracy, wherein the correction of Y-axis accuracy includes the following contents: The first step is to adsorb the bases of two micrometers on the Z axis of the CNC machine tool, with the needle of one micrometer hitting the positive generatrix of the calibration rod, and the needle of the other micrometer hitting the side generatrix of the calibration rod; The second step is to adjust the calibration rod to be perpendicular to the workbench, and control the Y-axis of the CNC machine tool to move up and down. The difference between the highest and lowest points of the Y-axis is the position deviation of the Y-axis relative to the workbench. The third step is to adjust the foundation pads of the CNC machine tool so that the difference between the highest point and the lowest point approaches zero.

[0014] Furthermore, the present invention can also calibrate the workbench, and can also perform linkage correction on any two or three of the X-axis, Z-axis and Y-axis, to achieve precision correction between axes and improve the machining accuracy of the machine tool.

[0015] Compared with the prior art, the calibration rod of the present invention provides a measurement reference for the micrometer. The first power mechanism can drive the calibration rod to rotate horizontally through the swivel seat to adjust the measurement reference position; the second power mechanism can drive the calibration rod to swing up and down with its bottom as the center. The first monitoring unit and the second monitoring unit are used to monitor the rotation angle of the swivel seat and the swing angle of the calibration rod respectively, and the position of the calibration rod can be accurately determined to ensure the accuracy of the measurement reference. The present invention combined with the micrometer can realize the precision measurement of each axis of the CNC machine tool (single-axis measurement, two-to-two combined linkage measurement, and three-axis linkage measurement) and the workbench, which is simple to operate and improves the calibration efficiency and calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 yes Figure 1 Omit the enlarged view of the calibration rod.

[0018] Figure 3 yes Figure 2 Top view of the .

[0019] Figure 4 This is another schematic diagram of the shell of the present invention, A is a top view, and B is a rear view of A.

[0020] Figure 5 It is a schematic diagram of the correction of the Y-axis of the CNC machine tool.

[0021] Figure 6 It is a schematic diagram of the correction of the X-axis of the CNC machine tool.

[0022] Figure 7 It is a schematic diagram of the linkage correction of the X-axis and Y-axis of a CNC machine tool.

[0023] Figure 8 It is a schematic diagram of the linkage correction of the Y-axis and Z-axis of a CNC machine tool.

[0024] Fig. 9 It is a schematic diagram of the linkage correction of the Z-axis, Y-axis and Z-axis of a CNC machine tool. DETAILED DESCRIPTION

[0025] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0026] It should be noted that, in the description of the present invention, relational terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-4 As shown, the present invention proposes a precision correction device for a numerically controlled machine tool, comprising a lower mounting structure, a first power mechanism, an upper mounting structure, a second power mechanism and a calibration rod 1 driven by the second power mechanism; the first power mechanism is arranged in the lower mounting structure, and it drives the second power mechanism and the calibration rod 1 to rotate in a circle; the second power mechanism is arranged in the upper mounting structure, and it can drive the calibration rod 1 to swing relatively; the lower mounting structure comprises an adjustable base 2a, a mounting seat 2b arranged on the adjustable base 2a and a swivel seat 2c arranged on the mounting seat 2b, the first power mechanism is arranged in a lower mounting cavity surrounded by the adjustable base 2a, the mounting seat 2b and the swivel seat 2c, and a first monitoring unit for monitoring the position of the swivel seat 2c is arranged in the lower mounting cavity; The upper mounting structure is mounted on the swivel seat 2c, and the shell 3a is fixedly connected to the swivel seat 2c. The shell 3a and the swivel seat 2c form an upper mounting cavity. The second power mechanism is located in the upper mounting cavity. The bottom of the calibration rod 1 extends into the upper mounting cavity and is transmission-connected to the second power mechanism. An adjustment hole 3b matching the calibration rod is provided on the top plate of the shell 3a, and a side through hole connected to the adjustment hole is provided on one side wall of the shell 3a, so that the calibration rod 1 can be driven by the second power mechanism to rotate at any angle (i.e., 0°-90°) in the space between the horizontal plane and the vertical plane to meet the needs of different calibration objects; a second monitoring unit for monitoring the position of the calibration rod 1 is provided in the upper mounting cavity; The signal output ends of the first monitoring unit and the second monitoring unit are connected to the signal input ends of the controller, and the display signal output end of the controller is connected to the signal input end of the display screen. The first monitoring unit and the second monitoring unit transmit the detected signals to the controller, and the controller analyzes the signals and displays them on the display screen, so as to determine the rotation position of the swivel seat 2c and the rotation position of the calibration rod 1.

[0029] During actual operation, the first power mechanism can drive the rotating seat 2c to rotate, thereby realizing the rotation of the calibration rod 1 on the rotating seat 2c; the second power mechanism can drive the calibration rod 1 to rotate with its bottom as the center; the first monitoring unit is used to monitor the position of the rotating seat 2c, thereby determining the relative rotation position of the calibration rod 1, and the second monitoring unit is used to monitor the rotation angle of the calibration rod 1, further ensuring that the position of the calibration rod 1 can meet the correction requirements.

[0030] During actual installation, leveling bolts 2d are evenly spaced at the edge of the adjustable base 2a, and the leveling bolts 2d are used to adjust the level of the adjustable base 2a. A leveling bead can be installed at the edge of the adjustable base 2a, and during the adjustment process, the leveling bead can be observed to determine whether the level of the adjustable base 2a is adjusted in place.

[0031] In actual processing, the housing 3a and the adjustable base 2a of the present invention can be made as follows: Figure 3 The circular structure shown in FIG. 1 may also be a Figure 4 The square structure shown.

[0032] Combination Figure 2 It can be seen that there is a support platform 2f above the side wall of the mounting seat 2b, and the swivel seat 2c is set on the support platform 2f. The swivel seat 2c and the inner wall of the mounting seat 2b are clearance-matched. A pressure cover 2e is set on the top of the side wall of the mounting seat 2b, and the pressure cover extends to the edge of the swivel seat 2c. The pressure cover 2e and the swivel seat 2c are clearance-matched. The gap between the pressure cover 2e and the swivel seat 2c is controlled within 0.012mm. The high-precision assembly can further ensure the high-precision rotation of the swivel seat 2c and further ensure the calibration accuracy. In actual work, due to the clearance fit between the swivel seat 2c and the mounting seat 2b, and the clearance fit between the pressure cover 2e and the swivel seat 2c, the swivel seat 2c can rotate on the mounting seat 2b to meet the adjustment requirements of the position of the calibration rod 1; The first power mechanism includes a first worm 7a and a first worm wheel 7b meshing with the first worm 7a. A pair of first supports 7c are arranged at intervals on the adjustable base 2a below the swivel seat 2c. The two ends of the first worm 7a are respectively arranged on the first supports 7c and are clearance-matched with the first supports 7c to ensure that the first worm 7a can rotate when subjected to force. There is a step shaft at the bottom center of the swivel seat 2c (the step shaft and the swivel seat 2c can be welded or interference-fitted), the first worm 7a is fixedly connected to the step shaft, and a fastening nut 3d is fixedly connected to the bottom of the step shaft. When the first worm 7a is subjected to force, the first worm 7a transmits power to the first worm wheel 7b, and the first worm wheel 7b drives the swivel seat 2c to rotate synchronously through the step shaft, thereby realizing the rotation of the calibration rod 1 to achieve the adjustment of the position of the side busbar and the positive busbar.

[0033] During actual installation, one end of the first worm 7a has a mounting hole (preferably a square hole), and the mounting head of the manual crank can be inserted into the mounting hole. During operation, the first worm 7a can be rotated by rotating the manual crank. To meet the installation requirements of the manual crank, a hole can be opened on the side wall of the mounting seat 2b to allow the manual crank to pass through.

[0034] Combination Figure 2 It can be seen that the first monitoring unit includes a first magnetic grating 4 and a first reading head matched with the first magnetic grating 4. The first magnetic grating 4 is mounted at the edge of the bottom surface of the rotating seat 2c, and the first reading head is mounted on the mounting seat 2b close to the first magnetic grating 4. The spacing between the first reading head and the first magnetic grating 4 can be determined according to the instructions. When the first magnetic grating 4 passes the first reading head, a signal is triggered, and the first magnetic grating 4 transmits the signal to the controller and displays the rotation angle of the rotating seat 2c through the display.

[0035] The second power mechanism includes a second worm 5a and a second worm wheel 5b meshing with the second worm 5a. A second support 5c and a third support 5d are arranged on the top of the rotating seat 2c. The second support 5c is a pair and is arranged at intervals. The second worm 5a is arranged on the second support 5c. The second worm 5a and the second support 5c are clearance-matched to ensure that the second worm 5a can rotate relative to the second support 5c under force; the lower part of the calibration rod 1 extends into the upper mounting chamber, and the lower part of the calibration rod 1 is fixedly connected to a horizontal connecting shaft 5e. The left end of the connecting shaft 5e is inserted into the third support 5d and clearance-matched with the third support 5d (the clearance is controlled within 0.01mm to ensure high-precision rotation of the connecting shaft), and the second worm wheel 5b is coaxially arranged at the right end of the connecting shaft 5e, and a fastening nut is screwed on the right end of the connecting shaft 5e; the second worm wheel 5b is located above the second worm 5a and the two are meshed with each other. When the second worm 5a rotates under force, it transmits power to the second worm wheel 5b above, and the connecting shaft 5e rotates synchronously with the second worm wheel 5b, so that the calibration rod 1 rotates around the connecting shaft 5e. The angle between the calibration rod 1 and the horizontal plane can be adjusted to meet the calibration requirements of different calibration objects.

[0036] Combination Figure 2 It can be seen that the second monitoring unit includes a second magnetic grating 6 and a second reading head matched with the second magnetic grating 6. The second magnetic grating 6 is installed on the right side of the second worm gear 5b, and the second reading head is installed near the second magnetic grating 6. The spacing between the second reading head and the second magnetic grating 6 is within the range specified in the specification. When the second magnetic grating 6 passes the second reading head, a signal is triggered, and the second magnetic grating 6 transmits the signal to the controller, which analyzes the received signal and displays the rotation angle of the calibration rod 1 through the display.

[0037] During actual installation, one end of the second worm 5a has a mounting hole (preferably a square hole), and the mounting head of the manual crank can be inserted into the mounting hole. During operation, the second worm 5a can be rotated by rotating the manual crank. To meet the installation requirements of the manual crank, a hole can be opened on the side wall of the housing 3a to allow the manual crank to pass through.

[0038] When the position of the calibration rod 1 relative to the horizontal plane needs to be adjusted, the manual crank is inserted into the second worm 5a and rotated. The second worm 5a is driven by the force to drive the second worm wheel 5b to rotate, so that the calibration rod 1 rotates around the connecting shaft 5e. During the rotation process, the second magnetic grating 6 transmits the position signal to the controller, which analyzes the signal and displays it on the display screen to determine the position of the calibration rod 1 relative to the horizontal plane; When the calibration rod 1 needs to be rotated, the manual crank is inserted into the first worm 7a and rotated. The first worm 7a is driven by force to drive the first worm wheel 7b to rotate, and the first worm wheel 7b drives the swivel seat 2c to rotate synchronously, thereby realizing the rotation adjustment of the calibration rod 1. During the rotation process, the first magnetic grating 4 transmits the position signal to the controller, and the controller analyzes the signal and displays it on the display screen to determine the horizontal rotation angle of the calibration rod 1.

[0039] The present invention also proposes a method for calibrating the accuracy of a CNC machine tool. In the method, the surface of the calibration rod 1 opposite to the working axis is defined as the front surface, and the generatrix at the center of the front surface is defined as the positive generatrix. L1 ; The direction perpendicular to the front is the side, and the busbar in the middle of the side is the side busbar L2 , specifically including the following: 1. Calibration of single-axis precision of CNC machine tools 1. Correction of Y-axis accuracy: Place the CNC machine tool accuracy correction device of the present invention on the workbench F of the machine tool, level the adjustable base 2a by the leveling bolt 2d to ensure the horizontality of the correction device; install and fix the micrometer on the table base (using a commercially available magnetic fine-tuning table), and adsorb the table bases of the two micrometers on the Z axis of the CNC machine tool respectively, and adjust the position of each micrometer by adjusting the table base, so that the needle of one micrometer hits the positive generatrix of the calibration rod 1, and the needle of the other micrometer hits the side generatrix of the calibration rod 1; rotate the second worm 5a to rotate the calibration rod 1 with its bottom as the center, and adjust the calibration rod 1 to a vertical state so that it is perpendicular to the workbench of the machine tool, as shown in detail. Figure 5 ; Control the Y-axis of the CNC machine tool within the travel range. The difference between the two extreme positions is the position deviation of the Y-axis relative to the workbench; adjust the foot pads of the CNC machine tool and control the Y-axis to move up and down, and repeat this process until the difference between the highest and lowest points approaches zero, and the Y-axis calibration is completed.

[0040] 2. Correction of X-axis accuracy: combined with Figure 6 , use the first worm and the first worm wheel to rotate the calibration rod 90 degrees relative to the Y-axis correction level, and then rotate the second worm 5a to make the calibration rod 1 rotate with its bottom as the center, adjust the calibration rod 1 to a horizontal state, and make the axis of the calibration rod 1 parallel to the X-axis; control the X-axis of the CNC machine tool to move within the travel range, and the difference between the maximum travel and the minimum travel of the micrometer is the position deviation of the X-axis relative to the workbench; fine-tune the position of the X-axis, and adjust the difference between the maximum travel and the minimum travel of the X-axis after each fine-tuning until the difference approaches zero or is equal to zero, and the X-axis calibration can be completed; of course, for the X-axis that cannot be adjusted, the X-guide rail corresponding to the X-axis can be loosened, and the X-axis can be adjusted by fine-tuning the X-guide rail.

[0041] 3. Correction of Z-axis accuracy: rotate the second worm 5a to make the calibration rod 1 rotate with its bottom as the center, adjust the calibration rod 1 to a horizontal state, and make the angle between the axis of the calibration rod 1 and the X-axis be 90°; control the Z-axis of the CNC machine tool to move within the travel range, and the difference between the micrometer corresponding to the maximum travel and the minimum travel is the position deviation of the Z-axis relative to the workbench; fine-tune the position of the Z-axis until the difference approaches zero or is equal to zero.

[0042] 2. Calibration of CNC machine tool worktable (worktable F is a rotating platform) Adsorb a dial holder on the bed of the machine tool so that the dial gauge head is on the side axis of the calibration rod 1; rotate the worktable so that the calibration rod 1 contacts the dial gauge a and resets the dial gauge a to zero; rotate the worktable in the opposite direction so that the dial gauge b on the other side contacts the calibration rod 1 and resets the dial gauge b to zero; rotate the worktable F and use the control system of the machine tool to determine the rotation angle of the worktable from the dial gauge a to the dial gauge b; The position of the calibration rod 1 is adjusted by using the first power mechanism and the second power mechanism to determine the position corresponding to the zeroing of the micrometer a and the micrometer b. The corresponding angle at this time is displayed on the display screen. The angle difference between the angle on the display screen and the rotation angle determined by the control system is the error value of the work platform. This error can be eliminated by using the anchor pads of the CNC machine tool until the angle difference is equal to zero or close to zero, and the calibration of the workbench can be completed.

[0043] 3. Linkage correction between axes of CNC machine tools 1. Adjust the calibration rod 1 so that it is in the same plane as the axis of the X-axis, and then adjust the calibration rod 1 so that it is raised upward at a certain angle (see Figure 7 ), place two micrometers on the positive busbar and the side busbar respectively, then move the Y-axis and X-axis at the same time, determine the error of the Y-axis and the error of the X-axis respectively, and fine-tune the guide rails corresponding to the two axes until the error is close to zero or equal to zero, completing the calibration of the X-axis and Y-axis; 2. The above method can be used to complete the linkage correction of the Y-axis and Z-axis. For details, see Figure 8 ; 3. Adjust the standard mandrel and rotate it to a 45° angle with the projection lines of the Z-axis, Y-axis, and X-axis. Place two micrometers on the positive busbar and the side busbar respectively, then move the X-axis, Y-axis, and Z-axis at the same time to determine the error of the X-axis, the error of the X-axis, and the error of the Z-axis. The relative error between the three axes can be eliminated by fine-tuning the positions of the guide rails of the X-axis, Y-axis, and Z-axis. For details, see Fig. 9 .

[0044] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A precision calibration device for a numerically controlled machine tool, characterized in that: It comprises a lower mounting structure, a first power mechanism, an upper mounting structure, a second power mechanism and a calibration rod driven by the second power mechanism; The lower mounting structure includes an adjustable base, a mounting seat arranged on the adjustable base, and a swivel seat arranged on the mounting seat, the first power mechanism is installed in a lower mounting cavity surrounded by the adjustable base, the mounting seat and the swivel seat, and a first monitoring unit for monitoring the position of the swivel seat is arranged in the lower mounting cavity; The upper mounting structure is mounted on the swivel seat, and the upper mounting structure has an upper mounting cavity, the second power mechanism is mounted in the upper mounting cavity, the bottom of the calibration rod is transmission-connected with the second power mechanism, and an adjustment hole matching the calibration rod is provided on the top plate of the upper mounting structure; a second monitoring unit for monitoring the position of the calibration rod is provided in the upper mounting cavity; The signal output terminals of the first monitoring unit and the second monitoring unit are both connected to the signal input terminal of the controller, and the display signal output terminal of the controller is connected to the signal input terminal of the display screen.

2. The CNC machine tool precision correction device according to claim 1, characterized in that: A support platform is provided above the side wall of the mounting seat, the swivel seat is arranged on the support platform, and the swivel seat and the inner wall of the mounting seat are gap-matched; a pressure cover is provided on the top of the side wall of the mounting seat, the pressure cover extends to the edge of the swivel seat, and the pressure cover and the swivel seat are gap-matched.

3. The CNC machine tool precision correction device according to claim 1, characterized in that: The first power mechanism includes a first worm and a first worm wheel meshing with the first worm. A stepped shaft is provided at the bottom center of the swivel seat. The first worm wheel is coaxially mounted on the stepped shaft. The first worm wheel is mounted on a first support provided on the adjustable base.

4. The CNC machine tool precision correction device according to claim 3, characterized in that: The first monitoring unit includes a first magnetic grating and a first reading head matching the first magnetic grating. The first magnetic grating is installed at the edge of the bottom surface of the rotating seat and is used to obtain the position of the first worm gear. The first reading head is installed on a mounting seat close to the first magnetic grating.

5. The CNC machine tool precision correction device according to claim 3, characterized in that: The second power mechanism includes a second worm and a second worm wheel meshing with the second worm, a second support and a third support are arranged on the top of the rotary seat, and the second worm is rotatably arranged on the second support; The lower part of the calibration rod extends into the upper mounting chamber, and a horizontal connecting shaft is fixedly connected to its lower part. The left end of the connecting shaft is inserted into the third support and has a clearance fit with the third support. The second worm gear is coaxially arranged at the right end of the connecting shaft, and a fastening nut is screwed on the right end of the connecting shaft.

6. The CNC machine tool precision correction device according to claim 5, characterized in that: The second monitoring unit includes a second magnetic grating and a second reading head matching the second magnetic grating. The second magnetic grating is installed on the right side of the second worm gear to obtain the position of the second worm gear. The second reading head is installed near the second magnetic grating.

7. The CNC machine tool precision correction device according to claim 5, characterized in that: The ends of the first worm and the second worm are both provided with mounting holes matched with the manual crank.

8. The CNC machine tool precision correction device according to claim 1, characterized in that: The upper mounting structure includes a shell disposed on the swivel seat.

9. A method for calibrating the precision of a numerically controlled machine tool, characterized in that: The CNC machine tool precision correction device according to any one of claims 1 to 6 is adopted, and the method includes correction of X-axis precision, correction of Y-axis precision and correction of Z-axis precision, and the correction of Y-axis precision includes the following contents: The first step is to adsorb the bases of two micrometers on the Z axis of the CNC machine tool, with the needle of one micrometer hitting the positive generatrix of the calibration rod, and the needle of the other micrometer hitting the side generatrix of the calibration rod; The second step is to adjust the calibration rod to be perpendicular to the workbench, and control the Y-axis of the CNC machine tool to move up and down. The difference between the highest and lowest points of the Y-axis is the position deviation of the Y-axis relative to the workbench. The third step is to adjust the foundation pads of the CNC machine tool so that the difference between the highest point and the lowest point approaches zero.

10. The method for calibrating the precision of a numerically controlled machine tool according to claim 1, characterized in that: It also includes the calibration of the workbench accuracy and the linkage calibration of any two or three of the X-axis, Z-axis and Y-axis.

Images