High-precision coordinate boring machine spindle box structure thermal deformation measuring device and measuring method

Abstract

The application provides a high-precision coordinate boring machine spindle box structure thermal deformation measuring device and measuring method. The measuring device comprises a spindle box, a heating plate, a shim, a temperature control box, a level, a temperature sensor and a micrometer. The measuring method comprises the following steps: installing the heating plate on the inner wall of the spindle box; using the shim to level the spindle box; installing the measuring device; heating the inner wall of the spindle box and recording the temperature change of the inner wall; measuring the thermal deformation of the spindle box in different directions and the slope of different measuring points; measuring the thermal deformation of a measuring point on the end face of the spindle box and calculating the thermal deformation of other measuring points on the end face of the spindle box; repeating the heating and measuring several times. Based on the deformation data of the measuring points, the thermal deformation of the spindle box is displayed through post-processing; the annular thermal deformation fluctuation is evaluated to further guide the spindle box structure design. The application meets the high-precision detection requirements of the spindle box electric spindle heating and the inner wall thermal deformation and ensures the machining quality of the coordinate boring machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-precision coordinate boring machine spindle box thermal deformation, in particular to a high-precision coordinate boring machine spindle box structure thermal deformation measuring device and measuring method. BACKGROUND

[0002] The coordinate boring machine spindle box thermal deformation problem is of great significance in the machining process of machine tools, which can significantly affect the machining precision and machine tool performance. Due to the friction heat generated by the spindle box during high-speed operation, the temperature rises, causing thermal deformation and affecting the machining precision. Therefore, accurate measurement of thermal deformation is crucial for controlling machining precision and improving machine tool stability.

[0003] Patent No. CN108548839B, a high-precision part thermal deformation testing device and testing method, and patent No. CN215115980U, a high-precision part thermal deformation testing device, not only visually observe the deformation of the part during the testing process, but also have specific data support through sensors and pressure gauges. However, the use of a large number of sensors and pressure gauges leads to a complex testing process and large measurement errors.

[0004] In order to solve the above problems, in view of the deficiencies of the prior art, the present application proposes a new thermal deformation measuring method. This method only needs to use a dial gauge to measure the thermal deformation of one measuring point, then expand the data by measuring the slope between different measuring points with an electronic level, and can accurately calculate the thermal deformation of other measuring points. Compared with the traditional measuring method, the measuring method of the present application has the advantages of simple operation, short measuring time, accurate results, small error, etc. In addition, this method can accurately simulate real scenes and provide more reliable basis for thermal deformation control in actual processing. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a high-precision coordinate boring machine spindle box structure thermal deformation measuring device and measuring method.

[0006] According to the high-precision coordinate boring machine spindle box structure thermal deformation measuring device provided by the present application, the main shaft box 1, the dial gauge 2, the electronic level 4, the temperature sensor 3, the heating plate 5, the iron pad 6, the heating plate temperature control box 7 and the data acquisition module 8 are connected.

[0007] The dial gauge 2 and the electronic level 4 are installed on the main shaft box 1;

[0008] The heating plate 5 and the temperature sensor 3 are installed in the main shaft box 1;

[0009] The heating plate temperature control box 7 and the heating plate 5 are connected and controlled by cable to generate heat;

[0010] The data acquisition module 8 is connected to the temperature sensor 3 to transmit temperature change data in real time.

[0011] The shim 6 is used to level the spindle box 1.

[0012] Preferably, the temperature sampling frequency of the temperature sensor 3 is 1 Hz, and the recording frequency of the dial gauge 2 is once every 30 minutes.

[0013] According to the application, a measuring method of the measuring device for measuring the thermal deformation of the high-precision coordinate boring machine spindle box structure is provided, which comprises the following steps:

[0014] Step S1: install the heating plate 5 to the inner wall of the spindle box 1;

[0015] Step S2: use the shim 6 to level the spindle box 1;

[0016] Step S3: install the dial gauge 2 and the temperature sensor 3 to the spindle box 1;

[0017] Step S4: heat the inner wall of the spindle box 1 and record the temperature change of the inner wall;

[0018] Step S5: measure the thermal deformation of the spindle box 1 in different directions by the dial gauge 2, and measure the slope of different measuring points by the electronic level 4;

[0019] Step S6: repeat the heating measurement several times, and based on the deformation data of the measuring points, process and display the thermal deformation of the spindle box 1;

[0020] Step S7: evaluate the fluctuation of the annular thermal deformation, and further guide the structure design of the spindle box 1.

[0021] Preferably, in step S1, the heating plate is used as a simulated heat source instead of the theoretical heat source of the boring machine, i.e. the heating of the electric spindle, to perform the test.

[0022] Preferably, in step S1, the heating plate has a heating plate temperature control box, which can accurately control the heating temperature change of the heating plate and simulate the actual heating of the electric spindle.

[0023] Preferably, in step S2, the shim is used to level the spindle box, specifically three height-adjustable shims and an electronic level are used, a work tool is first erected on the upper end face of the spindle box, the electronic level is used to measure the left and right measuring points, the height of the shim is adjusted to make the reading of the electronic level be 0, then the work tool is rotated by 90°, the electronic level is used to measure the upper and lower measuring points, the height of the shim is adjusted to make the reading of the electronic level be 0, and the end face of the spindle box is ensured to be horizontal, so as to avoid the influence of errors in the process of measuring thermal deformation.

[0024] Preferably, in step S3, the temperature sensor 3 is provided in multiple, distributed between the heating plate 5 and the inner wall of the spindle box, and the end face of the spindle box.

[0025] Preferably, in step S3, the dial gauge 2 is provided in multiple, distributed on the X, Y, Z three direction end faces of the spindle box 1, recording the readings of the thermal deformation of the end face of the spindle box during heating.

[0026] Preferably, in step S5, according to the readings of the dial gauge 2 on the X, Y, Z three direction end faces of the spindle box 1, the thermal deformation is recorded, and the electronic level 4 is used to detect the slope of multiple measuring points on the end face of the spindle box, to further estimate the thermal deformation.

[0027] Preferably, in step S5, the measuring points are multiple points evenly distributed on the circumferential end face of the spindle box 1, and the vertical height difference between the different measuring points is the length of the base bottom surface multiplied by the level reading.

[0028] Preferably, in step S7, the process of evaluating the annular thermal deformation fluctuation includes:

[0029] Step S701: The electronic level 4 measures the slope of the adjacent two measuring points P1-P2, and calculates the initial height difference;

[0030] Step S702: Heating, using the dial gauge 2 to calculate the vertical deformation of P1 point;

[0031] Step S703: The electronic level 4 measures the slope of the adjacent two measuring points P1-P2, and calculates the height difference after heating;

[0032] Step S704: Calculate the value of each measuring point before heating from the value of P1 measuring point before heating and the slope, and calculate the value of each measuring point after heating from the absolute value of P1 measuring point deformation after heating and the slope;

[0033] Step S705: Calculate the height difference of all adjacent measuring points before and after heating in turn, take the maximum value as the thermal deformation, and establish the fluctuation diagram according to the thermal deformation.

[0034] Preferably, in step S7, when evaluating the annular thermal deformation fluctuation, the measuring point data is processed as follows:

[0035] Before heating, the value N01 of the measuring point P1 is measured using the dial gauge (2), the reading between P1-P2 is measured using the electronic level (4), that is, the slope K01, the initial height difference H01=L×level reading K01 is calculated, the value N02 of the measuring point P2 before heating is N01+H01, the slope K between each measuring point is measured using the electronic level (4), and the value of each measuring point before heating is obtained according to the slope relationship between each measuring point;

[0036] After heating, the absolute deformation of the P1 measuring point is measured by using the dial gauge (2), the value N11 of the measuring point P1 after heating is obtained, the reading between the P1-P2 measuring points, i.e., the slope K11, is measured by using the electronic level (4), the height difference H11=L*K11 is obtained, the value N12 of the measuring point P2 after heating is obtained, i.e., N12=N11+H11, the slope K after heating between the measuring points is measured by using the electronic level (4), and the values of the measuring points after heating are obtained according to the slope between the measuring points.

[0037] The values N of the measuring points before and after heating are subtracted, the maximum value is obtained, i.e., the thermal deformation of the measuring points before and after heating, and the annular wave diagram is established according to the thermal deformation of the measuring points before and after heating.

[0038] Preferably, after the step S7 evaluates the annular thermal deformation wave of the end surface of the spindle box 1, the structure design of the spindle box 1 is optimized according to the thermal deformation of the end surface of the spindle box 1 in different directions, and the structure is optimized again.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] 1、The measuring method and the measuring device provided by the present application can simulate the actual working heating condition of the electric spindle of the boring machine, meet the measurement requirement of accurately measuring the thermal deformation of the spindle box, and guide the structure design of the spindle box to meet the design requirement.

[0041] 2、In the present application, the thermal deformation conditions of the end surface of the spindle box in three directions can be fully shown by installing the dial gauges and the temperature sensors at multiple positions.

[0042] 3、In the present application, the heating temperature can be accurately controlled by the temperature control box and the data acquisition module, and the temperature change curve can be visualized, so that the thermal deformation condition of the spindle box and the temperature change condition can be intuitively shown.

[0043] 4、In the present application, five measuring points are arranged on the end surface of the spindle box, and a new method for measuring the wave thermal deformation condition of the end surface of the spindle box is designed. This method not only accurately calculates the thermal deformation condition of the spindle box by using the five measuring points, but also is more simple, convenient and accurate compared with other traditional methods for measuring the thermal deformation of the spindle box. In the traditional method, a dial gauge is needed to measure each measuring point, while in the present application, only one dial gauge is needed to measure the thermal deformation of one measuring point, and the thermal deformation data of all the five measuring points can be obtained by expanding the data of the measuring points by measuring the slope by using the electronic level, so that the measurement process is greatly simplified, the measurement efficiency is improved, and the measurement cost is reduced. This innovative method provides a new solution for the measurement of the thermal deformation of the spindle box under the premise of ensuring the measurement accuracy, and highlights its unique technical advantages. BRIEF DESCRIPTION OF DRAWINGS

[0044] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings:

[0045] Figure 1 Flow chart of the present application;

[0046] Figure 2 Schematic diagram of using shim to level the left and right measuring points of the end face of the spindle box;

[0047] Figure 3 Schematic diagram of using shim to level the upper and lower measuring points of the end face of the spindle box;

[0048] Figure 4 Structural schematic diagram of the measuring device of the present application;

[0049] Figure 5 Schematic diagram of the Z-direction measuring point of the end face of the spindle box and the electronic level;

[0050] Figure 6 Schematic diagram of the XY-direction measuring point of the spindle box and the temperature sensor.

[0051] The drawings show:

[0052] Spindle box 1

[0053] Tooling 10

[0054] 1st micrometer 201

[0055] 2nd micrometer 202

[0056] 3rd micrometer 203

[0057] 4th micrometer 204

[0058] 5th micrometer 205

[0059] 6th micrometer 206

[0060] Temperature sensor 3

[0061] 1st temperature sensor 301

[0062] 2nd temperature sensor 302

[0063] 3rd temperature sensor 303

[0064] Electronic level 4

[0065] Heating plate 5

[0066] Shim 6

[0067] Heating plate temperature control box 7

[0068] Data acquisition module 8

[0069] P1 measuring point 101

[0070] P2 measuring point 102

[0071] P3 measuring point 103

[0072] P4 measuring point 104

[0073] P5 measuring point 105 Detailed Implementation

[0074] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0075] like Figures 1 to 4 As shown, the high-precision coordinate boring machine spindle box structure thermal deformation measuring device provided by the present invention includes a spindle box 1, a dial indicator 2, an electronic level 4, a temperature sensor 3, a heating plate 5, a worktable, a shim 6, a heating plate temperature control box 7, and a data acquisition module 8, which can accurately simulate the thermal deformation of the working electric spindle of the spindle box. The heating plate 5 and the temperature sensor 3 are installed inside the spindle box 1; the heating plate temperature control box 7 is connected to the heating plate 5 via a cable to control heating; the data acquisition module 8 is connected to the temperature sensor 3 and transmits temperature change data in real time; the temperature sensor 3 has a temperature sampling frequency of 1Hz, and the dial indicator records measurements every 30 minutes.

[0076] Specifically, such as Figure 2 , Figure 3As shown, the heating plate 5 is installed to the main shaft box inner wall 1 for simulating the heating of the electric spindle, and after the installation of the heating plate 5 is completed. The main shaft box 1 is placed on the workbench by leveling the pad iron 6, and after the leveling is verified by using the level 3, the installation of the dial gauge 2 and the temperature sensor 3 is carried out. Specifically, three height-adjustable pad irons 6 and an electronic level 4 are used, a tooling is first erected at the upper end surface of the main shaft box 1, and then the electronic level 4 is used to measure the left and right two measuring points, the height of the pad iron 6 is adjusted so that the reading of the electronic level 4 is 0, and then the tooling is rotated by 90° and the electronic level 4 is used to measure the upper and lower two measuring points, the height of the pad iron 6 is adjusted so that the reading of the electronic level 4 is 0, and the end surface of the main shaft box is ensured to be horizontal, so as to avoid the influence of errors in the process of measuring thermal deformation. The number of temperature sensors 3 is three, two temperature sensors 301 and 302 are symmetrically placed between the heating plate 5 and the inner wall of the main shaft box 1, and one temperature sensor 303 is placed on the end surface of the main shaft box. The number of dial gauges 2 is six, the second dial gauge 202 and the third dial gauge 203 are placed on the end surface of the main shaft box, the fifth dial gauge 205 and the sixth dial gauge 206 are placed on the slider mounting surface, and the first dial gauge 201 and the fourth dial gauge 204 are arranged on the side surface of the main shaft box. The temperature sensor 3 is connected with the data acquisition module 8, the acquisition instrument configuration is set, and the data is collected and stored. For the X and Y direction end surfaces of the main shaft box 1, the thermal deformation amount of different measuring points before and after heating is directly measured by using the dial gauge 2. For the Z direction end surface of the main shaft box 1, the value N01 of the measuring point P1 before heating is measured by using the dial gauge 2, the reading K01 between the two measuring points P1 and P2 is measured by using the electronic level 4, the initial height difference H01=L×K01 is calculated, the value N02 of the measuring point P2 before heating is N01+H01, the slope K between the measuring points is measured by using the electronic level 4, and the values of the measuring points before heating are obtained according to the slope relationship between the measuring points; the heating plate 5 is adjusted to 40℃, the actual measured heating temperature is 28℃, the inner wall of the main shaft box 1 is heated, and the temperature change curves of the inner upper surface of the main shaft box 1, the inner wall near the heating plate and the inner wall far from the heating plate are recorded by using the temperature sensor 3. After heating, the absolute deformation amount of the P1 measuring point is measured by using the dial gauge 2, the value N11 of the measuring point P1 after heating is obtained, the reading K11 between the two measuring points P1 and P2 is measured by using the electronic level 4, the height difference H11=L×K11 is calculated, the value N12 of the measuring point P2 after heating is N11+H11, the slope K between the measuring points after heating is measured by using the electronic level 4, the values of the measuring points after heating are obtained according to the slope between the measuring points, the height differences of the measuring points before and after heating are calculated, and the maximum value is the thermal deformation amount. The heating test is repeated for several times to reduce the error, the thermal deformation fluctuation curve of the ring is drawn according to the thermal deformation amount, the thermal deformation of the three direction end surfaces of the main shaft box 1 is displayed by post-processing based on the deformation data of the measuring points, and the structure design of the main shaft box 1 is further guided.

[0077] The application further provides a high-precision coordinate boring machine main shaft box structure thermal deformation measurement method, which comprises the following steps: Figure 1As shown, comprising the following steps:

[0078] S1, install the heating plate to the main shaft box inner wall;

[0079] S2, use the anvil to level the main shaft box;

[0080] S3, install the micrometer and temperature sensor and other measuring devices;

[0081] S4, heat the inner wall of the main shaft box and record the temperature change of the inner wall;

[0082] S5, use the micrometer to measure the thermal deformation of the X and Y direction end faces of the main shaft box, use the electronic level to measure the slope of different measuring points on the Z direction end face of the main shaft box, and use the micrometer to measure the thermal deformation of one measuring point on the Z direction end face of the main shaft box, and calculate the thermal deformation of other measuring points on the Z direction end face of the main shaft box;

[0083] S6, repeat the heating measurement several times to reduce the error. Based on the deformation data of the measuring points, the thermal deformation of the main shaft box is displayed after processing;

[0084] S7, evaluate the annular thermal deformation fluctuation, and further guide the structure design of the main shaft box.

[0085] In step S1, the heating plate 5 is used as a test measurement simulation heat source instead of the actual heat source of the electric spindle of the boring machine to perform the test. The heating plate 5 has a heating plate temperature control box 8, which can accurately control the heating temperature change of the heating plate 5 to simulate the actual electric spindle heating.

[0086] In step S3, the number of temperature sensors 3 is three, and the positions are two temperature sensors 3 symmetrically arranged between the heating plate 5 and the inner wall of the main shaft box, and one temperature sensor 3 arranged on the end face of the main shaft box. The number of micrometers 2 is six, and the positions are one on the Z direction end face of the main shaft box, two on the X direction end face, and three on the Y direction end face, to record the readings of the end face thermal deformation during the heating process of the main shaft box. After installing the temperature sensor 3, connect the temperature sensor 3 with the temperature module 9 of the acquisition instrument 9 to reflect the temperature change of the inner upper surface of the main shaft box, the near end inner wall of the heating plate, and the far end inner wall of the heating plate in real time.

[0087] In step S4, when heating, the temperature of the heating plate 5 is adjusted to the actual electric spindle heating temperature to heat the inner wall of the main shaft box to simulate the actual electric spindle heating temperature. When heating, the temperature change curves of the main shaft box 1 and the heating plate 5 are drawn and displayed in real time through the temperature sensor 3 and the acquisition instrument 9.

[0088] In the heating process of the step S5, the thermal deformation is recorded according to the readings of the dial gauges 2 on the end faces of the spindle box 1 in the X, Y and Z directions, the thermal deformation of the end faces of the spindle box 1 in the X and Y directions is obtained according to the readings of the dial gauges 2, the thermal deformation of a measuring point on the end face of the spindle box 1 in the Z direction is obtained according to the readings of the dial gauges 2, the slope of five measuring points on the end face of the spindle box 1 in the Z direction is detected by using the electronic level 4, and the thermal deformation of the remaining measuring points on the end face of the spindle box 1 in the Z direction is calculated. The five points on the circumferential end face of the spindle box 1 are P1, P2, P3, P4 and P5, which are evenly divided. The vertical height difference between different measuring points is the length of the base bottom surface multiplied by the reading of the level.

[0089] In the step S6, multiple rounds of repeated heating are performed, and the data of the measuring points after multiple times of heating are recorded, so as to effectively simulate the thermal deformation of the electric spindle of the boring machine spindle box when the electric spindle is repeatedly used in actual use. Based on the deformation data of the measuring points, the thermal deformation of the end faces of the spindle box 1 in the X, Y and Z directions and six positions can be intuitively displayed based on three-dimensional software after post-processing.

[0090] The detailed process of evaluating the annular thermal deformation fluctuation in the step S7 is as follows:

[0091] S701, the electronic level measures the slope of P1-P2, and calculates the initial height difference;

[0092] S702, heating is loaded, and the vertical deformation of P1 point is calculated by using the dial gauge;

[0093] S703, the electronic level measures the slope of P1-P2, and calculates the height difference after heating;

[0094] S704, the value of each measuring point before heating is calculated from the value of P1 measuring point before heating and the slope, and the value of each measuring point after heating is calculated from the absolute value of the deformation of P1 measuring point after heating and the slope;

[0095] S705, the height differences of P1-P2-P3-P4-P5 measuring points before and after heating are calculated in turn, the maximum value is taken as the thermal deformation, and a fluctuation diagram is established according to the thermal deformation.

[0096] The detailed process of processing the data of the measuring points when the annular thermal deformation fluctuation is evaluated in the step S7 is as follows:

[0097] Before heating, the value N01 of the measuring point P1 is measured by using the dial gauge 2, the reading between P1 and P2 is measured by using the electronic level 4, that is, the slope K01, the initial height difference H01 is calculated as the length L of the base bottom surface of the electronic level multiplied by the reading K01 of the level, the value N02 of the measuring point P2 before heating is obtained as N01+H01, the slope K between each measuring point is measured by using the electronic level 4, and the values of each measuring point before heating are obtained according to the slope relationship between each measuring point;

[0098] After heating, the absolute deformation of the P1 measuring point is measured using the dial gauge (2) to obtain the value N11 of the measuring point P1 after heating, the reading between the P1-P2 measuring points, i.e., the slope K11, is measured using the electronic level (4), the height difference H11 = L x K11, and the value N12 of the measuring point P2 after heating = N11 + H11 is obtained. The slope K between the measuring points after heating is measured using the electronic level (4), and the values of the measuring points after heating are obtained according to the slope between the measuring points; the height differences of the measuring points P1, P2, P3, P4, and P5 before and after heating are calculated in turn, the maximum value is taken as the thermal deformation, and the annular fluctuation chart is established according to the thermal deformation before and after heating.

[0099] The values N of the measuring points before and after heating are subtracted, and the maximum value is taken as the thermal deformation of each measuring point before and after heating, and the annular fluctuation chart is established according to the thermal deformation of each measuring point before and after heating.

[0100] After evaluating the annular thermal deformation fluctuation of the end face of the main shaft box 1, the structure of the main shaft box 1 is optimized according to the thermal deformation of the end face of the main shaft box 1 in different directions, and the structure is optimized again to meet the design requirements.

[0101] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0102] The specific embodiments of the present application have been described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A method for measuring the thermal deformation of the spindle box structure of a high-precision coordinate boring machine, characterized in that, Includes the following steps: Step S1: Install the heating plate (5) onto the inner wall of the spindle box (1); Step S2: Level the spindle box (1) using shims (6); Step S3: Install the dial indicator (2) and temperature sensor (3) into the spindle box (1); Step S4: Heat the inner wall of the spindle box (1) and record the temperature change of the inner wall; Step S5: Dial indicator (2) measures the thermal deformation of spindle box (1) in different directions, and electronic level (4) measures the inclination of different measuring points; Step S6: Repeat the heating measurement several times, and based on the deformation data of the measuring points, post-process and display the thermal deformation of the spindle box (1); Step S7: Evaluate the annular thermal deformation fluctuation to further guide the structural design of the spindle box (1); In step S7, the process of evaluating the annular thermal deformation fluctuation includes: Step S701: The electronic level (4) measures the slope of two adjacent measuring points P1-P2 and calculates the initial height difference; Step S702: After heating, use a dial indicator (2) to calculate the vertical deformation of point P1; Step S703: The electronic level (4) measures the slope of two adjacent measuring points P1-P2 and calculates the height difference after heating; Step S704: Calculate the value of each measuring point before heating based on the value of measuring point P1 before heating and the slope; calculate the value of each measuring point after heating based on the absolute value of deformation of measuring point P1 and the slope based on the dial indicator reading after heating. Step S705: Calculate the height difference before and after heating for all adjacent measuring points in sequence, take the maximum value as the thermal deformation, and establish a fluctuation diagram based on the thermal deformation.

2. The measurement method according to claim 1, characterized in that, In step S3, multiple temperature sensors (3) are provided, distributed between the heating plate (5) and the inner wall of the spindle box and on the end face of the spindle box.

3. The measurement method according to claim 1, characterized in that, In step S3, multiple dial indicators (2) are provided, and the multiple dial indicators (2) are distributed on the X, Y and Z direction end faces of the spindle box (1) to record the readings of the thermal deformation of the end face during the heating process of the spindle box.

4. The measurement method according to claim 3, characterized in that, In step S5, thermal deformation is recorded based on the readings of the dial gauge (2) on the X, Y, and Z end faces of the spindle box (1). An electronic level (4) is used to detect the inclination of multiple measuring points on the end face of the spindle box to further estimate the thermal deformation.

5. The measurement method according to claim 4, characterized in that, The measuring points in step S5 are multiple points evenly divided on the circumferential end face of the spindle box (1), and the vertical height difference between different measuring points is the base bottom surface length multiplied by the level reading.

6. The measurement method according to claim 1, characterized in that, When evaluating the annular thermal deformation fluctuation in step S7, the measurement point data is processed as follows: Before heating, use a dial indicator (2) to measure the value N01 of measuring point P1. Use an electronic level (4) to measure the reading between two measuring points P1 and P2, i.e., the slope K01. Calculate the initial height difference H01 = length of the base of the electronic level L × reading of the level K01. Get the value N02 of measuring point P2 before heating = N01 + H01. Use an electronic level (4) to measure the slope K between each measuring point. Based on the slope relationship between each measuring point, get the value of each measuring point before heating. After heating, use a dial indicator (2) to measure the absolute deformation of point P1 and obtain the value N11 of point P1 after heating. Use an electronic level (4) to measure the reading between points P1 and P2, i.e., the slope K11. The height difference H11 = L × K11, and obtain the value N12 of point P2 after heating = N11 + H11. Use an electronic level (4) to measure the slope K between each point after heating, and obtain the value of each point after heating based on the slope between each point. Subtract the values ​​N at each measuring point before and after heating, and take the maximum value as the thermal deformation amount at each measuring point before and after heating. Establish a ring-shaped fluctuation diagram based on the thermal deformation amount at each measuring point before and after heating.

7. The measurement method according to claim 1, characterized in that, After evaluating the annular thermal deformation fluctuation of the end face of the spindle box (1) in step S7, the structural design of the spindle box (1) is optimized in a targeted manner according to the thermal deformation of the end face of the spindle box (1) in different directions, and then the structure is optimized multiple times again.

8. An apparatus for measuring the thermal deformation of the spindle box structure of a high-precision coordinate boring machine as described in claim 1, characterized in that, Includes a spindle box (1), a dial indicator (2), a temperature sensor (3), an electronic level (4), a heating plate (5), a shim (6), a heating plate temperature control box (7), and a data acquisition module (8), wherein: A dial indicator (2) and an electronic level (4) are installed on the spindle box (1); The heating plate (5) and temperature sensor (3) are installed inside the spindle box (1); The heating plate temperature control box (7) is connected to the heating plate (5) via a cable to control the heating. The data acquisition module (8) is connected to the temperature sensor (3) and transmits temperature change data in real time; The shim (6) is used to level the spindle box (1).

9. The measuring device for thermal deformation of the high-precision coordinate boring machine spindle box structure according to claim 8, characterized in that, The temperature sensor (3) has a temperature sampling frequency of 1Hz, and the dial gauge (2) records measurements every 30 minutes.

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