A machine tool spindle angle runout error measurement method

Abstract

The application discloses a machine tool spindle angular runout error measuring method, which comprises a measuring tool, a flat crystal and a probe, the flat crystal is connected with a spindle through the measuring tool, and the probe is provided with at least two, and the measuring ends of all the probes are all directed to the flat crystal; the measuring method comprises the following steps: measuring equipment installation; perpendicularity error control; data measurement and recording; angular runout error calculation; wherein the measuring equipment comprises the measuring tool, the flat crystal and the probe; in the step of perpendicularity error control, the perpendicularity error of the flat crystal relative to the spindle axis is adjusted to a set range. The machine tool spindle angular runout error measuring method aims to provide a measuring method which is convenient to adjust, high in efficiency and high in control precision, gets rid of the dependence on the experience of operators in the prior art, and improves the measuring efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of error measurement method, and particularly relates to a machine tool spindle angular runout error measurement method. BACKGROUND

[0002] Machine tool spindle angular runout error refers to the angular error or wobble error generated by the machine tool spindle during rotation. In the machine tool processing process, especially in the case of high-precision processing, the angular wobble error of the spindle may affect the processing precision. The generation of spindle angular wobble error can be caused by many factors, including machine tool structure, bearing accuracy, transmission system, processing load, etc. These factors may cause the spindle not to completely maintain the ideal rotation axis during rotation, thereby causing instability and changes in the size, shape and surface roughness of the workpiece.

[0003] The measurement and control of spindle angular runout error are very important for applications requiring high-precision processing. By measuring the spindle angular runout error, the actual movement of the spindle can be understood, and appropriate measures can be taken for compensation or correction to ensure the precision and quality of the workpiece.

[0004] Different processing tasks have different tolerances for spindle angular runout error. In some precision machining fields such as optics and semiconductor manufacturing, the requirement for spindle angular runout error is very strict, so high-precision measurement and correction methods need to be used to ensure processing quality. In some other applications, a certain degree of spindle angular runout error may not significantly affect the final product.

[0005] At present, the measurement of spindle angular runout error adopts the double-standard ball method, which requires the center line of the two standard balls to coincide with the machine tool spindle axis. The knock method or screw displacement is used, and the efficiency is very low, and the coaxiality error is not easy to control, which affects the measurement accuracy of the spindle angular runout error. SUMMARY

[0006] The purpose of the present application is to provide a machine tool spindle angular runout error measurement method to solve the above problems existing in the prior art.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] A machine tool spindle angular runout error measurement method, comprising a measuring tool, a flat crystal and a probe, the flat crystal being connected to the spindle through the measuring tool, and the probe being provided with at least two, the measuring ends of all the probes being directed towards the flat crystal;

[0009] The measurement method comprises the following steps:

[0010] Measurement equipment installation;

[0011] Perpendicularity error control;

[0012] Data measurement and recording;

[0013] Angular runout error calculation;

[0014] Wherein, the measuring device comprises a measuring tool, a flat crystal and a probe; in the step of perpendicularity error control, the perpendicularity error of the flat crystal relative to the spindle axis is adjusted to a set range.

[0015] In a possible design, the measuring tool comprises a base and an adjusting disc connected to each other, the adjusting disc has two opposite sides, one side is connected to the spindle through the base, and the adjusting disc is provided with an adjusting structure for driving the adjusting disc to swing relative to the base, and the other side is fixedly connected to the flat crystal.

[0016] In a possible design, the base has two opposite outer surfaces, one side is configured as a mounting surface detachably connected to the spindle, and the other side is configured as a connecting surface for connecting the adjusting disc, the connecting surface is provided with an outward convex spherical cap and a plurality of adjusting holes, the spherical cap is located at the center of the connecting surface, and the adjusting holes are uniformly distributed on the same circumference outside the spherical cap;

[0017] The adjusting disc is provided with a swing groove matched with the spherical cap and an adjusting screw matched with the adjusting hole, and the adjusting screw is provided with a plurality of adjusting screws and is arranged one-to-one with the adjusting holes;

[0018] When the base is connected to the adjusting disc, the spherical cap is inserted into the swing groove, the adjusting screw is inserted into the adjusting hole, and the adjusting screw is screwed to make the adjusting disc swing relative to the spherical cap.

[0019] In a possible design, the adjusting holes are provided with four adjusting holes, which are evenly divided into two adjusting groups, and the connecting lines between the adjusting holes in the two adjusting groups are perpendicular to each other; correspondingly, the adjusting screws are provided with four adjusting screws.

[0020] The adjusting screw comprises a stud and a differential nut, the stud is provided through the adjusting hole and the adjusting disc, and the differential nut is provided through the outer periphery of the adjusting disc, and the inner periphery of the differential nut is sleeved on the stud;

[0021] Correspondingly, the adjusting hole, the stud and the differential nut form the adjusting structure.

[0022] In a possible design, the probe is provided with two probes parallel to each other, one of which is located on the spindle axis, and the other probe has a measuring end facing the flat crystal and not exceeding the side edge of the flat crystal; correspondingly, when the flat crystal is configured as a circular shape, the distance between the two probes is not greater than the radius of the flat crystal.

[0023] In a possible design, the step of installing the measuring device comprises the following steps:

[0024] The measuring tool is fixedly connected to the spindle through the base;

[0025] The measuring end of the fixed probe is directed towards the flat crystal.

[0026] In a possible design, the step of verticality error control comprises the following steps:

[0027] The first verticality is measured by the probe;

[0028] The adjusting disc is rotated to a first measuring straight line, the adjusting disc is swung relative to the spherical cap by the adjusting structure, the probe measures and records data;

[0029] The adjusting disc is rotated to a second measuring straight line, the adjusting disc is swung relative to the spherical cap by the adjusting structure, the probe measures and records data;

[0030] The second verticality is calculated according to the data measured by the probe twice;

[0031] The adjusting is repeated until the second verticality is less than a set range;

[0032] The first measuring straight line and the second measuring straight line are perpendicular to each other.

[0033] In a possible design, the step of data measurement and recording comprises the following steps:

[0034] A plurality of measuring points are set on the measuring surface;

[0035] The main shaft is rotated at least one round, and the measuring values of the measuring points are measured by the probe when the main shaft is rotating;

[0036] The measuring values of the probe are recorded.

[0037] In a possible design, the step of angle swing error calculation comprises the following steps:

[0038] The shaft runout of the main shaft is calculated, the shaft runout of the main shaft = Δ1max- Δ1min;

[0039] The angle swing of the main shaft is calculated, the angle swing of the main shaft = (Δ2- Δ1) / r;

[0040] The probe is provided with two, one of which is located on the axis of the main shaft and is the first probe, and the other is the second probe, the measuring value of the first probe is Δ1, the maximum value is Δ1max, and the minimum value is Δ1min, the measuring value of the second probe is Δ2, and the distance between the two probes is r.

[0041] Beneficial effects:

[0042] The proposed method for measuring the angular runout error of a machine tool spindle aims to provide a convenient, efficient, and highly precise measurement method, eliminating the reliance on operator experience in existing technologies and improving measurement efficiency. It can be used for both spindle angular runout and spindle axial deviation calculations, enriching the measurement range and providing more spindle operating parameters, which is helpful for later adjustments and improvements. Attached Figure Description

[0043] Fig. 1 This is a flowchart illustrating a method for measuring the angular runout error of a machine tool spindle.

[0044] Fig. 2 A schematic diagram of the structure for connecting the spindle to the measuring equipment.

[0045] Fig. 3 This is a schematic diagram of the measuring equipment.

[0046] In the picture:

[0047] 100. Measuring fixture; 101. Base; 102. Adjusting plate; 103. Spherical cap; 104. Adjusting hole; 105. Swing groove; 200. Crystal flat; 300. Probe; 301. First probe; 302. Second probe; 400. Spindle; 500. Adjusting screw; 501. Stud; 502. Differential nut. Detailed Implementation

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0049] Example:

[0050] like Figs. 1-3 As shown, a method for measuring the angular runout error of a machine tool spindle includes a measuring fixture 100, a flat crystal 200, and a probe 300. The flat crystal 200 is connected to the spindle 400 through the measuring fixture 100. There are at least two probes 300, and the measuring ends of all probes 300 face the flat crystal 200.

[0051] The measurement method includes the following steps:

[0052] Installation of measuring equipment;

[0053] Verticality error control;

[0054] Data measurement and recording;

[0055] angular runout error calculation;

[0056] Wherein, the measuring device comprises a measuring tool 100, a flat crystal 200 and a measuring head 300; in the step of perpendicularity error control, the perpendicularity error of the flat crystal 200 relative to the axis of the main shaft 400 is adjusted to a set range.

[0057] Wherein, the flat crystal 200 is used as a measuring tool, high-precision measurement is realized through the flat crystal 200 interference method, and relevant measurement data is obtained, and the angular runout error of the main shaft 400 is obtained according to the data. Specifically, the flat crystal 200 is connected with the main shaft 400 through the measuring tool 100, and the measuring end of the measuring head 300 faces the flat crystal 200 and measures; further, this is the step of measuring device installation.

[0058] At the same time, when the flat crystal 200 is connected with the main shaft 400 through the measuring tool 100, there is an assembly error between the measuring tool 100 and the main shaft 400, so the assembly error is first eliminated through the step of perpendicularity error control, and then high-precision measurement is realized, which also helps to improve the accuracy of the measurement result.

[0059] In theory, the end face of the main shaft 400 and the flat crystal 200 are parallel to each other, so the data obtained by the measuring head 300 measuring the flat crystal 200 is equivalent to the data obtained by directly measuring the main shaft 400, but in actual measurement, the end face of the main shaft 400 and the flat crystal 200 are not parallel to each other. Therefore, through the step of perpendicularity error control, the end face of the main shaft 400 and the flat crystal 200 are made as parallel as possible, and the data obtained by the measuring head 300 measuring the flat crystal 200 can also correspond to the main shaft 400 more accurately.

[0060] The end face of the main shaft 400 and the flat crystal 200 are made as parallel as possible, and the perpendicularity error of the measuring surface relative to the axis of the main shaft 400 is adjusted to a set range, wherein the corresponding set range can be set according to different use environments. That is, the machine tool main shaft angular runout error measurement method has a wide range of applications and good practicability.

[0061] For the step of data measurement and recording, the main shaft 400 rotates, and the measuring head 300 measures and records a plurality of groups of data. As can be easily understood, the more data tested, the more conducive to improving the test precision, but the more time required for testing.

[0062] For the step of angular runout error calculation, the data obtained in the step of data measurement and recording can be calculated.

[0063] Therefore, the machine tool main shaft angular runout error measurement method aims to provide a measurement method which is convenient to adjust, efficient and has high control precision, and is free from the dependence on the experience of operators in the prior art, and improves the efficiency of measurement.

[0064] In the embodiment, the measuring tool 100 comprises a base 101 and an adjusting disc 102 connected in sequence, the adjusting disc 102 has two opposite sides, one side is connected with the main shaft 400 through the base 101, and the adjusting disc 102 is provided with an adjusting structure for driving the adjusting disc 102 to swing relative to the base 101, and the other side is fixedly connected with the flat crystal 200.

[0065] According to the above design scheme, the base is detachably connected with the main shaft 400, so as to avoid interfering with the normal use of the main shaft 400. The adjusting disc 102 is driven to swing relative to the base 101 through the adjusting structure, and the flat crystal 200 is fixed on the adjusting disc 102, so as to be cooperated with the measuring head 300 through the adjusting structure, so as to control the perpendicularity error of the flat crystal 200 and eliminate the assembly error between the measuring tool 100 and the main shaft 400.

[0066] In a possible implementation, the base 101 has two opposite outer surfaces, one side is configured as a mounting surface detachably connected with the main shaft 400, and the other side is configured as a connecting surface for connecting the adjusting disc 102, the connecting surface is provided with an outward convex spherical cap 103 and a plurality of adjusting holes 104, the spherical cap 103 is located at the center of the connecting surface, and the adjusting holes 104 are uniformly distributed on the same circle outside the spherical cap 103.

[0067] The adjusting disc 102 is provided with a swing groove 105 matched with the spherical cap 103 and an adjusting screw 500 matched with the adjusting hole 104, the adjusting screw 500 is provided with a plurality of adjusting screws and is arranged in one-to-one correspondence with the adjusting holes 104.

[0068] When the base 101 is connected with the adjusting disc 102, the spherical cap 103 is inserted into the swing groove 105, the adjusting screw 500 is inserted into the adjusting hole 104, and the adjusting screw 500 is screwed to make the adjusting disc 102 swing relative to the spherical cap 103.

[0069] According to the above design scheme, when the base 101 is fixed on the main shaft 400, the adjusting disc 102 is swung with the spherical cap 103 as the center by screwing the adjusting screw 500, the flat crystal 200 swings with the adjusting disc 102, and then the perpendicularity error of the flat crystal 200 is adjusted. Different adjusting screws 500 are screwed to make the adjusting disc 102 swing in different directions and different amplitudes, and the adjustment is repeated for several times until the perpendicularity error relative to the axis of the main shaft 400 is within a set range.

[0070] For the adjusting disc 102, the adjusting screw 500 plays a role in adjusting to control the perpendicularity error of the flat crystal 200, and also plays a role in connecting the base 101 with the adjusting disc 102. It is easy to understand that the adjusting screw 500 is provided with a plurality of adjusting screws, so as to be operated from multiple directions by the operator, and the adjustment flexibility is better. At the same time, the swing groove 105 is preferably configured as an arc-shaped groove, which improves the smoothness when the adjusting disc 102 swings.

[0071] In a possible implementation, the adjusting holes 104 are provided with four and are divided into two adjusting groups in pairs, and the lines between the adjusting holes 104 in the two adjusting groups are perpendicular to each other; correspondingly, the adjusting screw 500 is provided with four;

[0072] The adjusting screw 500 includes a stud 501 and a differential nut 502, the stud 501 is provided on the adjusting hole 104 and the adjusting disc 102, and the differential nut 502 is provided on the adjusting disc 102, and the inner periphery of the differential nut 502 is sleeved on the stud 501;

[0073] Correspondingly, the adjusting hole 104, the stud 501 and the differential nut 502 form the adjusting structure.

[0074] Based on the above design scheme, when the perpendicularity of the adjusting plane is adjusted, the first direction and the second direction perpendicular to each other are selected as the adjusting reference line. Therefore, the adjusting hole 104 and the adjusting screw 500 are each provided with four, and the two adjusting groups formed are arranged in the first direction and the second direction, respectively, so as to realize accurate adjustment and effectively reduce the amount of parts, and the adjustment is more convenient and takes less time.

[0075] Meanwhile, the adjusting screw 500 preferably uses the differential nut 502, when the operator rotates the differential nut 502, the differential nut 502 can produce a slight displacement, so as to make the adjusting disc 102 produce a slight swing, and realize the close control of the perpendicularity error of the flat crystal 200. For the operator, the effect of rotating the differential nut 502 on the adjusting disc 102 is more obvious, which improves the perception of the operator and helps to shorten the adjustment time.

[0076] Therefore, for the adjusting structure, when the perpendicularity error of the flat crystal 200 is adjusted, the differential nut 502 is rotated back and forth for several times, which is simple to operate.

[0077] In the embodiment, the measuring head 300 is provided with two and is parallel to each other, one of which is located on the axis of the main shaft 400, and the measuring end of the other one faces the flat crystal 200 and does not exceed the side edge of the flat crystal 200; correspondingly, when the flat crystal 200 is configured as a circle, the distance between the two measuring heads 300 is not greater than the radius of the flat crystal 200.

[0078] Based on the above design scheme, the main shaft 400 is connected to the machine tool, and the main shaft 400 can rotate, and the measuring head 300 remains relatively stationary after installation, and the data measurement of multiple points can be realized through the rotation of the main shaft 400, thereby providing multiple sets of data.

[0079] For the measuring head 300, one of the measuring head 300 is located on the spindle 400 axis, then the data measured by the measuring head 300 can be used for the spindle 400 angular swing calculation, also can be used for the spindle 400 shaft to calculate the calculation, rich in measurement range, also provides more spindle 400 working parameters, help to adjust and improve later. Another towards the flat crystal 200, and according to the spindle 400 angular swing calculation formula, the farther the distance between the two measuring heads 300, the higher the measurement accuracy, so the measuring end of the measuring head 300 is preferably aligned with the side edge of the flat crystal 200; when the flat crystal 200 is configured as a circle, the distance between the two measuring heads 300 is preferably the radius of the flat crystal 200.

[0080] In the embodiment, the step of measuring equipment installation comprises the following steps:

[0081] The measuring tool 100 is fixedly connected to the spindle 400 through the base 101; wherein the measuring tool 100 comprises an adjusting disc 102 and the base 101, the adjusting disc 102 is fixedly connected to the flat crystal 200, the adjusting disc 102 is detachably connected to the base 101, and the base 101 is detachably connected to the spindle 400. Therefore, in this step, the base 101 and the adjusting disc 102 are fixed on the spindle 400 in sequence.

[0082] The measuring end of the fixed measuring head 300 faces the flat crystal 200; wherein the measuring head 300 is provided with two, one of which is located on the spindle 400 axis, and the measuring end of the other faces the flat crystal 200 and does not exceed the side edge of the flat crystal 200. In order to improve the measurement accuracy, the measuring end of the measuring head 300 is preferably aligned with the side edge of the flat crystal 200 to increase the distance between the two measuring heads 300.

[0083] Based on the above design scheme, the installation of the measuring tool 100, the flat crystal 200 and the measuring head 300 is realized, wherein the base 101 can be connected to the spindle 400 by any suitable detachable connection method, the adjusting disc 102 is connected to the base 101 through the adjusting structure, and the structure and working principle of the adjusting structure have been described, which will not be repeated here.

[0084] In the embodiment, the step of perpendicularity error control comprises the following steps:

[0085] The first perpendicularity is measured by the measuring head 300; wherein the initial perpendicularity of the flat crystal 200 after installation is obtained, and the first perpendicularity includes assembly error, which is eliminated through subsequent adjustment.

[0086] Rotating the adjusting disc 102 to the first measuring straight line, the adjusting disc 102 is swung relative to the spherical cap 103 through the adjusting structure, the measuring head 300 measures and records data; wherein, two measuring heads 300 can record data of two point positions on the first measuring straight line, and then obtain the perpendicularity of the first measuring straight line, the adjusting disc 102 is adjusted according to the perpendicularity, so that the perpendicularity of the first measuring straight line is as much as possible to meet the set range, thereby obtaining a straight line with required perpendicularity on the flat crystal 200.

[0087] Rotating the adjusting disc 102 to the second measuring straight line, the adjusting disc 102 is swung relative to the spherical cap 103 through the adjusting structure, the measuring head 300 measures and records data; that is, another straight line with required perpendicularity is obtained on the flat crystal 200, and the first measuring straight line and the second measuring straight line are perpendicular to each other, and then the perpendicularity of the flat crystal 200, that is, the second perpendicularity, is obtained.

[0088] The second perpendicularity is calculated according to the data measured by the measuring head 300 twice; wherein, according to the difference between the second perpendicularity and the set range, the direction of the next adjustment is determined, so that the perpendicularity error of the flat crystal 200 reaches the design requirement as soon as possible.

[0089] Repeat the adjustment until the second perpendicularity is less than the set range; wherein, when adjusting, it is preferred that the first measuring straight line coincides with the first direction, and the second measuring straight line coincides with the second direction, so as to eliminate the included angle between the measuring straight line and the swinging direction of the adjusting disc 102, and improve the accuracy and speed of the adjustment.

[0090] Based on the above design scheme, the perpendicularity error is controlled through the steps, so that the end face of the main shaft 400 is as much as possible to be parallel to the flat crystal 200, and the data obtained by the measuring head 300 measuring the flat crystal 200 can also correspond to the main shaft 400 more accurately, so as to eliminate the assembly error and realize high-precision measurement, which is also helpful to improve the accuracy of the measurement result.

[0091] In the embodiment, the step of data measurement and recording includes the following steps:

[0092] A plurality of measuring points are set on the surface; wherein, generally 10-20 measuring points are selected, and the specific number can be increased or decreased according to the size of the flat crystal 200.

[0093] The main shaft 400 rotates at least one revolution, and the measuring value of the measuring point is measured by the measuring head 300 when the main shaft 400 rotates; wherein, in order to improve the measurement accuracy, the main shaft 400 can rotate more than one revolution, and the operator records more data.

[0094] The measuring value of the measuring head 300 is recorded.

[0095] Based on the above design scheme, the data for calculation is obtained to obtain the angular swing and shaft runout of the main shaft 400.

[0096] In the embodiment, the step angle runout error calculation comprises the following steps:

[0097] Shaft runout calculation of the main shaft 400, shaft runout of the main shaft 400 = Δ1max- Δ1min;

[0098] Angle runout calculation of the main shaft 400, angle runout of the main shaft 400 = (Δ2- Δ1) / r;

[0099] Wherein, the two probes 300 are provided, one of which located on the axis of the main shaft 400 is the first probe 301, and the other is the second probe 302, the measurement value of the first probe 301 is Δ1, the maximum value is Δ1max, and the minimum value is Δ1min, the measurement value of the second probe 302 is Δ2, and the distance between the two probes 300 is r.

[0100] Based on the above design scheme, data is selected according to the calculation formula, and the data is fitted into the formula.

[0101] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of measuring angular runout of a machine tool spindle, characterized by, The measurement device comprises a measurement tool (100), a flat crystal (200) and a probe (300), the flat crystal (200) is connected to a main shaft (400) through the measurement tool (100), and the probe (300) is provided with at least two, and the measurement ends of all the probes (300) are all directed to the flat crystal (200); The measurement method comprises the following steps: Measurement device installation; Perpendicularity error control; Data measurement and recording; Angular runout error calculation; The measurement device comprises a measurement tool (100), a flat crystal (200) and a probe (300); in the step of perpendicularity error control, the perpendicularity error of the flat crystal (200) relative to the axis of the main shaft (400) is adjusted to a set range; the measurement tool (100) comprises a base (101) and an adjusting disc (102) connected to each other, the adjusting disc (102) has opposite two sides, one side of the adjusting disc (102) is connected to the main shaft (400) through the base (101), and the adjusting disc (102) is provided with an adjusting structure, the adjusting structure is used for driving the adjusting disc (102) to swing relative to the base (101), and the other side of the adjusting disc (102) is fixedly connected to the flat crystal (200); the base (101) has opposite two outer surfaces, one side of the base (101) is structured as a mounting surface which is detachably connected to the main shaft (400), and the other side of the base (101) is structured as a connecting surface which is used for connecting the adjusting disc (102), the connecting surface is provided with an outward convex spherical cap (103) and a plurality of adjusting holes (104), the spherical cap (103) is located at the center of the connecting surface, and the adjusting holes (104) are uniformly distributed on the same circle outside the spherical cap (103); the adjusting disc (102) is provided with a swing groove (105) matched with the spherical cap (103) and adjusting screws (500) matched with the adjusting holes (104), the adjusting screws (500) are provided with a plurality of adjusting screws (500) and are arranged in one-to-one correspondence with the adjusting holes (104); when the base (101) is connected to the adjusting disc (102), the spherical cap (103) is inserted into the swing groove (105), the adjusting screws (500) are inserted into the adjusting holes (104), and the adjusting screws (500) are screwed to make the adjusting disc (102) swing relative to the spherical cap (103); The perpendicularity error control comprises the following steps: A first perpendicularity is obtained by measuring through the probe (300); The adjusting disc (102) is rotated to a first measurement straight line, the adjusting disc (102) is swung relative to the spherical cap (103) through the adjusting structure, and the probe (300) measures and records data; The adjusting disc (102) is rotated to a second measurement straight line, the adjusting disc (102) is swung relative to the spherical cap (103) through the adjusting structure, and the probe (300) measures and records data; A second perpendicularity is obtained according to the data measured twice by the probe (300); The adjustment is repeated until the second perpendicularity is less than the set range; The first measurement straight line and the second measurement straight line are perpendicular to each other; The angular runout error calculation comprises the following steps: Shaft runout calculation of the main shaft (400), the shaft runout of the main shaft (400)=Δ1max-Δ1min; Angular runout calculation of the main shaft (400), the angular runout of the main shaft (400)=(Δ2-Δ1) / r; Wherein, the measuring head (300) is provided with two, one of which is located on the axis of the main shaft (400) and is the first measuring head (301), and the other is the second measuring head (302), the measurement value of the first measuring head (301) is Δ1, the maximum value is Δ1max, and the minimum value is Δ1min, the measurement value of the second measuring head (302) is Δ2, and the distance between the two measuring heads (300) is r.

2. The machine tool spindle angular runout measurement method of claim 1, wherein, The adjusting holes (104) are provided with four and are divided into two adjusting groups, and the connecting lines between the adjusting holes (104) in the two adjusting groups are perpendicular to each other; correspondingly, the adjusting screw rods (500) are provided with four; The adjusting screw rod (500) includes a stud (501) and a differential nut (502), the stud (501) is provided in the adjusting hole (104) and the adjusting disc (102), and the outer periphery of the differential nut (502) is provided in the adjusting disc (102), and the inner periphery of the differential nut (502) is sleeved on the stud (501); Correspondingly, the adjusting hole (104), the stud (501) and the differential nut (502) form the adjusting structure.

3. The machine tool spindle angular runout measurement method of claim 1, wherein, The measuring head (300) is provided with two and is parallel to each other, one of which is located on the axis of the main shaft (400), and the other is located on the axis of the main shaft (400) and is not more than the side of the flat crystal (200); correspondingly, when the flat crystal (200) is circular, the distance between the two measuring heads (300) is not more than the radius of the flat crystal (200).

4. The machine tool spindle angular runout measurement method of claim 1, wherein, The step of measuring the equipment installation includes the following steps: The measuring tool (100) is fixedly connected with the main shaft (400) through the base (101); The measuring end of the fixed measuring head (300) faces the flat crystal (200).

5. The machine tool spindle angular runout measurement method of claim 1 wherein, The step of data measurement and recording includes the following steps: A plurality of measuring points are set on the measuring surface; The main shaft (400) rotates at least one revolution, and when the main shaft (400) rotates, the measuring value of the measuring point is measured by the measuring head (300); The measuring value of the measuring head (300) is recorded.

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