CN114152457A - Method for improving monitoring capability of precision servo turntable and precision servo turntable - Google Patents
Method for improving monitoring capability of precision servo turntable and precision servo turntable Download PDFInfo
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Abstract
The invention discloses a method for improving the monitoring capability of a precision servo turntable and the precision servo turntable, which monitors and measures the preset key quality control parameters of a U-shaped frame of the precision servo turntable, and comprehensively analyzes and evaluates the U-shaped frame based on the monitoring and measuring results to improve the monitoring capability of the precision servo turntable, namely the invention monitors and analyzes the state of a boring machine of the U-shaped frame to determine whether the precision of the boring machine meets the requirement of a processed product, thereby improving the monitoring capability of the precision servo turntable.
Description
Technical Field
The invention relates to the technical field of security inspection, in particular to a method for improving monitoring capability of a precision servo turntable and the precision servo turntable.
Background
In the field of science and technology, photoelectric comprehensive monitoring systems are widely applied. The precise servo turntable is a core component in the photoelectric comprehensive monitoring system, and has a remarkable influence on improving the monitoring capability of the photoelectric comprehensive monitoring system. However, the performance of the precision servo turntable is greatly influenced by the U-shaped frame of the servo turntable, but an effective means for evaluating the machining condition of the U-shaped frame is not available at present. Therefore, how to monitor the processing condition of the U-shaped frame becomes a problem to be solved urgently.
Disclosure of Invention
The invention provides a method for improving the monitoring capability of a precision servo turntable and the precision servo turntable, which are used for solving the problem that the processing condition of a U-shaped frame cannot be effectively monitored in the prior art.
In a first aspect, the present invention provides a method for improving monitoring capability of a precision servo turntable, the method comprising: monitoring and measuring preset key quality control parameters of a U-shaped frame of the precise servo turntable; on the basis of monitoring and measuring results, comprehensively analyzing and evaluating the U-shaped frame to improve the monitoring capability of the precise servo turntable; wherein the preset key quality control parameters include: image concatenation precision, the inclination gyration error of shafting, shafting vertical error, the roughness of reference surface, the straightness that hangs down of locating hole and reference surface between U type frame surface frame and the frame first side opening with the position precision of second side opening, and first side opening with the hole terminal surface of second side opening and the straightness that hangs down of reference surface, the reference surface is for using the base as the face of benchmark.
Optionally, the monitoring and measuring of the preset key quality control parameter of the U-shaped frame of the precision servo turntable includes: measuring the roughness of a reference surface of the U-shaped frame and the perpendicularity of the reference surface and the positioning hole; checking the gap between the workpiece and the table top before the workpiece is clamped, and performing the next step when the gap between the workpiece and the table top meets the preset requirement; establishing a three-dimensional coordinate system by taking a base as a reference, and checking the position precision of the first side hole and the second side hole and the perpendicularity of the hole end surfaces of the first side hole and the second side hole and a reference surface;
optionally, the monitoring and measuring of the preset key quality control parameter of the U-shaped frame of the precision servo turntable includes: and establishing a three-dimensional coordinate system XYZ on the reference surface, wherein the reference surface is the XY surface of the three-dimensional coordinate system, and monitoring and measuring the preset key quality control parameters in the three-dimensional coordinate system by taking the circle center of the positioning hole as the origin of the three-dimensional coordinate system.
Optionally, the method further comprises: through the precision of the machine tool is evaluated by the three-dimensional coordinate system, so that the machining precision of the first side hole and the second side hole is ensured, and the same reference is adopted by the machining reference, the assembling reference and the measuring reference.
Optionally, the flatness of the reference plane is less than or equal to 0.015 mm; the verticality between the positioning hole and the reference surface is less than or equal to 0.02 mm.
Optionally, the position deviation of the first side hole and the second side hole should be less than or equal to 0.02 mm;
optionally, the performing a comprehensive analysis on the U-shaped frame based on the monitoring and measuring results includes: calculating sigma standard deviation according to the flatness data of the reference surface to judge the rigidity condition of the main shaft or the cutter bar of the machine tool; calculating the standard deviation of sigma to judge the precision of the machine tool according to the verticality data of the positioning hole and the reference surface; after the card is installed, the perpendicularity between the end surfaces and the first side hole and the second side hole is compared with the data processed on the reference surface, and the accuracy of the card installation is analyzed and judged; and directly analyzing and evaluating the precision of the part based on the position precision of the first side hole and the second side hole to determine whether an expected result is achieved.
Optionally, based on the monitoring and measuring results, evaluating the precision servo turntable includes: and evaluating the precision servo turntable according to the condition of index realization, the process capability of turntable assembly and the influence point of the part structure on the turntable quality.
Optionally, after the comprehensive analysis and evaluation of the U-shaped frame, the method further comprises: and calculating the standard deviation, the maximum/minimum value and the process capability of each preset key quality control parameter of the U-shaped frame, and comparing the standard deviation, the maximum/minimum value and the process capability with different U-shaped frame structures, the pitching axis and the azimuth axis to comprehensively analyze and evaluate the U-shaped frame, thereby finally improving the monitoring capability of the precise servo turntable.
In a second aspect, the present invention provides a precision servo turntable comprising a U-shaped frame prepared by modifying any one of the above-described methods.
The invention has at least the following beneficial effects:
the invention monitors and measures the preset key quality control parameters of the U-shaped frame of the precise servo turntable, and comprehensively analyzes and evaluates the U-shaped frame based on the monitoring and measuring results to improve the monitoring capability of the precise servo turntable, namely, the invention monitors and analyzes the state of the boring machine of the U-shaped frame to determine whether the precision of the boring machine meets the requirement of a processed product, thereby improving the monitoring capability of the precise servo turntable.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a precision servo turntable provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a U-shaped frame according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a measurement system for measuring a gyration error of a gyration axis inclination angle by using an optical auto-collimation principle, provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of tilt gyration accuracy and axis vertical accuracy measurements provided by an embodiment of the present invention;
description of the drawings: 1U type frame, 2 reference planes, 3 locating holes, 4 left holes, 5 right holes.
Detailed Description
Aiming at the problem that the machining condition of a U-shaped frame cannot be effectively monitored in the prior art, the embodiment of the invention monitors and measures the preset key quality control parameters of the U-shaped frame of the precise servo turntable, and comprehensively analyzes and evaluates the U-shaped frame based on the monitoring and measuring results to improve the monitoring capability of the precise servo turntable. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example one
A first embodiment of the present invention provides a method for improving monitoring capability of a precision servo turntable, as shown in fig. 1 and 2, in the embodiment of the present invention, a preset key quality control parameter of a U-shaped frame of the precision servo turntable is monitored and measured; on the basis of monitoring and measuring results, comprehensively analyzing and evaluating the U-shaped frame to improve the monitoring capability of the precise servo turntable; the preset key quality control parameters in the embodiment of the invention comprise: image concatenation precision, the inclination gyration error of shafting, shafting vertical error, the roughness of reference surface, the straightness that hangs down of locating hole and reference surface between U type frame surface frame and the frame first side opening with the position precision of second side opening, and first side opening with the hole terminal surface of second side opening and the straightness that hangs down of reference surface, the reference surface is for using the base as the face of benchmark.
The embodiment of the invention is characterized in that a photosensitive camera is arranged on the U-shaped frame and used for shooting 360-degree images of the U-shaped frame, the images are 360 frames in total, and then the image splicing precision between every two frames is compared to determine the integral flatness of the U-shaped frame.
Generally speaking, the embodiment of the invention monitors and measures the preset key quality control parameters of the U-shaped frame of the precise servo turntable, and comprehensively analyzes and evaluates the U-shaped frame based on the monitoring and measuring results so as to finally improve the monitoring capability of the precise servo turntable.
The key quality control points of the present invention are shown in tables 1 and 2:
TABLE 1 conversion of functional requirements to technical requirements
Table 2 technical requirements translate to key control points
The first side hole is a left side hole, or may also be referred to as a left hole for short, and the second side hole is a right side hole, or may also be referred to as a right hole for short.
The embodiment of the invention provides a method for monitoring and measuring the preset key quality control parameters of a U-shaped frame of a precision servo turntable, which comprises the following steps: and measuring the roughness of the reference surface of the U-shaped frame and the perpendicularity of the reference surface and the positioning hole, namely establishing a three-dimensional coordinate system XYZ on the reference surface, wherein the reference surface is the XY surface of the three-dimensional coordinate system, and monitoring and measuring the preset key quality control parameters in the three-dimensional coordinate system by taking the circle center of the positioning hole as the origin of the three-dimensional coordinate system. Checking the gap between the workpiece and the table top before the workpiece is clamped, and performing the next step when the gap between the workpiece and the table top meets the preset requirement; establishing a three-dimensional coordinate system by taking a base as a reference, and checking the position precision of the first side hole and the second side hole and the perpendicularity of the hole end surfaces of the first side hole and the second side hole and a reference surface;
in specific implementation, in the embodiment of the present invention, the precision of the machine tool is evaluated through the three-dimensional coordinate system to ensure the machining precision of the first side hole and the second side hole, and the same reference is used for the machining reference, the assembly reference, and the measurement reference.
According to the invention, the machining precision of the U-shaped frame can be ensured to the greatest extent by adopting the same reference for the machining reference, the assembly reference and the measurement reference, so that the monitoring capability of the precision servo turntable is improved.
Specifically, the flatness of the reference surface of the embodiment of the invention is less than or equal to 0.015 mm; the perpendicularity of the positioning hole and the reference surface is less than or equal to 0.02mm, and the position deviation of the first side hole and the second side hole is less than or equal to 0.02 mm;
of course, in the specific implementation, a person skilled in the art may set other values according to actual needs, and the present invention is not limited to this.
In the embodiment of the present invention, the performing a comprehensive analysis on the U-shaped frame based on the monitoring and measuring results includes: calculating sigma standard deviation according to the flatness data of the reference surface to judge the rigidity condition of the main shaft or the cutter bar of the machine tool; calculating the standard deviation of sigma to judge the precision of the machine tool according to the verticality data of the positioning hole and the reference surface; after the card is installed, the perpendicularity between the end surfaces and the first side hole and the second side hole is compared with the data processed on the reference surface, and the accuracy of the card installation is analyzed and judged; and directly analyzing and evaluating the precision of the part based on the position precision of the first side hole and the second side hole to determine whether an expected result is achieved. And finally, evaluating the precision servo turntable according to the condition of index realization, the process capability of turntable assembly and the influence point of the part structure on the turntable quality. And then calculating the standard deviation, the maximum/minimum value and the process capability of each preset key quality control parameter of the U-shaped frame, and comparing the standard deviation, the maximum/minimum value and the process capability with different U-shaped frame structures, the pitching axis system and the azimuth axis system to comprehensively analyze and evaluate the U-shaped frame, and finally improving the monitoring capability of the precision servo turntable.
Generally, the technical problems to be solved by the invention are as follows: the key control points in the production of the precise servo turntable are not identified in advance, the working procedures of the machining process are not effectively controlled, and the subsequent turntable is difficult to assemble and adjust, so that the product meets the index requirements. Based on the method, the key parts and key control points are identified and confirmed in the production and detection processes of the precise servo turntable; optimizing a process route; planning key component measurement and evaluation methods; and carrying out summary research and induction on the comparative analysis of the structures of the azimuth axis and the pitch axis so as to finally improve the monitoring capability of the precision servo turntable.
In detail, a precise servo turntable is used as an important component of a photoelectric comprehensive monitoring system, the precise servo turntable is divided into an azimuth axis system and a pitching axis system, and the space is monitored through the rotation of the two axis systems. The test evaluation system includes:
(1) analyzing and determining key characteristics, namely analyzing parts of the precision rotary table by adopting a quality function expansion method and evaluating key quality control parameters; (2) a turntable precision processing control measure; (3) a turntable precision monitoring and measuring scheme; (4) analyzing and evaluating a scheme by statistical data; (5) product conformance analysis and evaluation; the turntable quality monitoring and evaluating system is implemented, so that products meeting requirements and consistency are obtained.
In specific implementation, a coordinate horizontal boring machine is selected as processing equipment in the embodiment of the invention, and the key process is that one-step clamping is adopted for processing the reference surface and the positioning hole in the reference processing process, and the mounting base surface is ensured to be free of scrap iron in the clamping process, and the clamping and fixing are reliable; the hole and the end face on one side are adopted in the hole and end face machining process, and one-time clamping machining is carried out; and rotating 180 degrees and then processing the other side hole and the end face.
The 'datum plane' is an installation datum, so that the machining and clamping are required to be positioned and machined by taking the 'datum plane' as a datum; when measuring at the same time, the 'datum plane' is also taken as a datum to measure; the superposition of processing, measuring and mounting references is ensured, and errors caused by reference conversion are avoided;
the process route of the finishing part of the invention comprises: machining a reference, clamping, finishing holes and end faces, treating surfaces, assembling and detecting.
The statistical data analysis and evaluation scheme of the examples of the present invention is shown in table 3.
TABLE 3 timing, content, method comparison table for monitoring
| Timing of | Content providing method and apparatus |
| After the reference element is processed | Roughness of reference surface and verticality of reference surface and positioning hole |
| Card loading process | Workpiece holderAfter the clamping and before the processing, the clearance between the workpiece and the table top is checked by a feeler gauge |
| After processing holes and end faces | Establishing a coordinate system, and checking the coordinate position precision of the hole; perpendicularity between end face and reference face |
The method comprises the following steps: the method for establishing the coordinate system establishes the coordinate system on the reference surface, X, Y, Z takes the center of the circle of the positioning hole on the reference surface and the projection point on the reference surface as the center of the circle; according to the requirements of drawings, the planeness of the reference surface is less than or equal to 0.015 mm; the perpendicularity between the positioning hole and the reference surface is less than or equal to 0.02mm, and the deviation of the position precision coordinate of the evaluation hole is less than or equal to 0.02 mm.
Firstly, a first machined hole clamped after a boring machine is evaluated, and the precision of the machine tool and the rigidity of a cutter bar are confirmed by detecting the coordinate position of the hole and the perpendicularity of the hole and an end face. And then, transversely rotating the processed product by 180 degrees, processing a second hole, and determining the rotation precision of the boring machine by detecting the coordinate position of the hole and the perpendicularity of the hole and the end face.
The reference surface, the positioning hole and the left/right hole of the U-shaped frame are shown in FIG. 2.
Establishing a coordinate system X, Y, Z on the reference surface, taking the center of a circle of the positioning hole on the reference surface and a projection point on the reference surface as a coordinate origin;
the monitoring content and method of the embodiment of the invention mainly comprise the following steps: precision of monitoring reference: the planeness of the reference surface is less than or equal to 0.015 mm; the verticality between the positioning hole and the reference surface is less than or equal to 0.02 mm. Monitoring the position accuracy of the hole: (evaluation is required in the case where the reference satisfies the expected result) the deviation of the position coordinates of the holes should be less than or equal to 0.02 mm; the monitoring time, content, monitoring sequence, detection content and monitoring items are shown in tables 3 and 4; mode of evaluation: and respectively evaluating layer by layer and process by process in a progressive mode, and stripping and decomposing overlapped influence factors.
TABLE 4 monitoring sequence, test Contents, monitored items
The scheme for analyzing and evaluating the statistical data comprises the following steps:
analysis and evaluation of the processing, wherein the content of the analysis and evaluation is: 1) calculating the standard deviation of the flatness data of the reference surface to judge the rigidity condition of a main shaft or a cutter bar of the machine tool; 2) the verticality data of the positioning hole and the reference surface is calculated, and the precision of the machine tool can be judged by calculating the standard deviation of the sigma; 3) after the verticality between the hole machined firstly and the end surface after the card is installed is compared with the data machined on the reference surface, and after the machine tool factors are eliminated, the accuracy of the card installation can be analyzed and judged; 4) the position accuracy of the left hole and the right hole can be directly analyzed and evaluated to determine whether the accuracy of the part reaches the expected result.
The principle of analysis and evaluation is: is based on the application process method; firstly, determining the sequence of the process and the expected result of the process; checking and confirming the process capability according to the sequence of the process; the purpose is as follows: overlapping and superposition of influencing factors are avoided, and the difficulty and uncertainty of analysis are increased;
method using hole coordinate position: the method is used for avoiding misjudgment caused by measurement errors caused by too short length of a reference element or a measured element when coaxiality/parallelism evaluation is adopted; through the coordinate position precision, the problems in the machining process can be conveniently found and evaluated.
After the product is assembled, the analysis method and the evaluation content of the evaluation comprise the following steps: the situation of index implementation; evaluating the process capability of the turntable assembly; identifying weak links in the rotary table processing, and searching for improved entry points; and identifying the influence points of the part structure on the quality of the rotary table.
The evaluation method comprises the following steps: 1) calculating standard deviation, maximum/minimum values and process capability; 2) comparing different structures; 3) different manufacturers make comparisons; 4) the pitch axis system is compared with the azimuth axis system.
The embodiment of the invention is based on the analysis and evaluation of the product conformity, the rotation precision of the dip angle and the vertical precision of the axis: GJB 1801-93 "inertia technology test equipment Main Performance test method", the test of the gyration precision of the dip angle is to place light pipe and servo revolving stage on the identity foundation, adjust the light pipe position to make the optical axis align with measured axial line; the test of the vertical precision of the axis is to evaluate by adopting two orthogonal pitching axes of the turntable and the vertical error theta of the pitching axes; after the inclination angle rotation precision test, respectively measuring theta i when the pitching axis (axis 1) of the rotary table is at 0-degree and 180-degree positions relative to the azimuth axis (axis 2) of the rotary table, and obtaining the vertical error theta of the two orthogonal pitching axes and the azimuth axis of the rotary table through formula calculation. The test procedure is shown in fig. 3 and 4.
The tilt angle gyration error of the embodiment of the invention to a pitch axis system/an azimuth axis system is shown in a table 5:
TABLE 5 Pitch shafting/Azimuth shafting inclination angle rotation error comparison table
As can be seen from table 5: the indexes of the azimuth axis system are superior to those of the pitch axis system; the maximum value of the pitching shafting is smaller than a specified value and meets the requirement; and the process capability index of the pitching shafting is more than 1.
The axis perpendicularity error of the embodiment of the invention is shown in table 6, and it can be seen from table 6 that: the maximum value is less than the specified value, meets the requirement, and the process capability index is greater than 1.
Table 6 axis verticality error data statistical table
| Error of axis perpendicularity | 20" |
| Maximum value max " | 17.25 |
| Minimum value min " | 5.00 |
| Mean value " | 10.04 |
| Standard deviation sigma | 3.01 |
| Process capability Cp | 1.11 |
The data statistical analysis in the embodiment of the invention comprises the following steps: in precision, the azimuth axis system is better than the pitch axis system; discreteness of data: the azimuth axis system is better than the pitch axis system; average value: the azimuth axis is better than the pitch axis.
The structure composition in the embodiment of the invention is shown in figure 1: the pitching axis system comprises: left/right + middle shield, azimuth axis: an azimuth principal axis.
In the embodiment of the invention, because the structure composition is different, the factors influencing the pitching axis system are more than the azimuth axis system; the precision of the pitching axis system is greatly influenced by the deformation of the middle cover.
Generally, approaches to improve machining accuracy include: quality improvement entry point, optimization process route
1. Quality improvement points of entry: u-shaped frame parts of the pitching axis system: before and after surface treatment, detection and comparison are carried out, and the end surfaces of the holes, namely the end surface of the left hole and the end surface of the right hole, are found to have larger verticality change with the holes; the analysis shows that: the reason is that the parts are deformed due to heating and drying during surface treatment;
2. the measures are as follows: optimizing a process route: after the analysis concludes, taking measures for optimizing the process route:
1) reserving a finishing allowance before surface treatment;
2) after surface treatment, the steel plate is clamped once and holes and end faces are machined. The optimized process route is as follows: datum processing, clamping, semi-finishing of hole and end face, surface treatment, finishing, assembling and detection
The statistical analysis data of the inclination angle rotation error data of the pitching shafting of the assembling rotary table before/after the optimized process route is taken are shown in the table 7, and the effect is as follows: the data dispersion is greatly reduced; the consistency of the product is improved; the maximum value of the gyration dip angle error is reduced by 41.6 percent; the discreteness of the error of the rotation inclination angle is reduced by 51.5 percent; the process capability index is improved by 2 times.
TABLE 7 Measure comparison table
From the statistics of the measured data, it can be seen that: through the implementation and application of the turntable quality monitoring and evaluating system, the product conformity meets the requirements;
from the standard deviation σ, it can be seen that the dispersion is at a relatively good level; the fluctuation of the process is better controlled; the consistency of the product reaches the expected result; the process capability index is more than 1;
and finding an entry point for quality improvement by using data statistical analysis, and successfully implementing the quality improvement.
The purposes of monitoring and evaluating the production and assembly of the rotary table are implemented by utilizing a rotary table quality monitoring and evaluating system: the conformity of the product is ensured; the ability to ensure a process; fluctuations in the control process; an improvement opportunity is determined and selected.
When planning a turntable quality monitoring and evaluating system: a quality function expansion method is adopted to expand the functional requirements into key characteristics needing to be controlled in the production process; the process method is adopted, the output of the upper process is the input of the lower process, the conformity of the process output is emphasized, the relevance in the process of analyzing the complex problem is decomposed and differentiated, and the difficulty in analyzing the problem is reduced; adopting the thinking of risk to emphasize prevention and control; for the control measures, the effectiveness and the acceptable degree of the measures are evaluated by analyzing an evaluation system; judging the acceptable degree by adopting a quality tool, a data statistics technology, a process capability index and a standard deviation; continuously searching a quality-improved access point by adopting a PDCA (packet data access) circulation method, and implementing improvement; the process control method is adopted to implement effective monitoring, evaluation and improvement around process capacity and process fluctuation.
Example two
The embodiment of the invention provides a precision servo turntable, which comprises a U-shaped frame prepared by improving any one method in the first embodiment of the invention. According to the invention, the monitoring capability of the precision servo turntable is finally improved by monitoring and measuring the preset key quality control parameters of the U-shaped frame and comprehensively analyzing and evaluating the U-shaped frame based on the monitoring and measuring results. Related contents of the U-shaped frame in the embodiment of the present invention can be understood with reference to the first embodiment, and are not described in detail herein.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A method of improving the monitoring capability of a precision servo turntable, comprising:
monitoring and measuring preset key quality control parameters of a U-shaped frame of the precise servo turntable;
on the basis of monitoring and measuring results, comprehensively analyzing and evaluating the U-shaped frame to improve the monitoring capability of the precise servo turntable;
wherein the preset key quality control parameters include: image concatenation precision, the inclination gyration error of shafting, shafting vertical error, the roughness of reference surface, the straightness that hangs down of locating hole and reference surface between U type frame surface frame and the frame first side opening with the position precision of second side opening, and first side opening with the hole terminal surface of second side opening and the straightness that hangs down of reference surface, the reference surface is for using the base as the face of benchmark.
2. The method of claim 1, wherein monitoring and measuring the pre-set critical quality control parameters of the U-frame of the precision servo turret comprises:
measuring the roughness of a reference surface of the U-shaped frame and the perpendicularity of the reference surface and the positioning hole;
checking the gap between the workpiece and the table top before the workpiece is clamped, and performing the next step when the gap between the workpiece and the table top meets the preset requirement;
and establishing a three-dimensional coordinate system by taking the base as a reference, checking the position precision of the first side hole and the second side hole, and checking the perpendicularity of the hole end surface of the first side hole and the second side hole and the reference surface.
3. The method of claim 2, wherein monitoring and measuring the pre-set critical quality control parameters of the U-frame of the precision servo turret comprises:
and establishing a three-dimensional coordinate system XYZ on the reference surface, wherein the reference surface is the XY surface of the three-dimensional coordinate system, and monitoring and measuring the preset key quality control parameters in the three-dimensional coordinate system by taking the circle center of the positioning hole as the origin of the three-dimensional coordinate system.
4. The method of claim 2, further comprising:
through the precision of the machine tool is evaluated by the three-dimensional coordinate system, so that the machining precision of the first side hole and the second side hole is ensured, and the same datum plane is adopted by the machining datum, the assembling datum and the measuring datum.
5. The method of claim 2,
the planeness of the reference surface is less than or equal to 0.015 mm;
the verticality between the positioning hole and the reference surface is less than or equal to 0.02 mm.
6. The method according to any one of claims 1 to 5,
the position deviation of the first side hole and the second side hole is less than or equal to 0.02 mm.
7. The method of claim 1, wherein said analyzing said U-shaped frame based on said monitoring and measuring comprises:
calculating sigma standard deviation according to the flatness data of the reference surface to judge the rigidity condition of the main shaft or the cutter bar of the machine tool;
calculating the standard deviation of sigma to judge the precision of the machine tool according to the verticality data of the positioning hole and the reference surface;
after the card is installed, the perpendicularity between the end surfaces and the first side hole and the second side hole is compared with the data processed on the reference surface, and the accuracy of the card installation is analyzed and judged;
and directly analyzing and evaluating the precision of the part based on the position precision of the first side hole and the second side hole to determine whether an expected result is achieved.
8. The method of any one of claims 1-5, wherein evaluating the precision servo turret based on the monitoring and measuring results comprises:
and evaluating the precision servo turntable according to the condition of index realization, the process capability of turntable assembly and the influence point of the part structure on the turntable quality.
9. The method according to any one of claims 1 to 5, wherein after the comprehensive analysis and evaluation of the U-shaped frame, the method further comprises:
and calculating the standard deviation, the maximum/minimum value and the process capability of each preset key quality control parameter of the U-shaped frame, and comparing the standard deviation, the maximum/minimum value and the process capability with different U-shaped frame structures, the pitching axis and the azimuth axis to comprehensively analyze and evaluate the U-shaped frame, thereby finally improving the monitoring capability of the precise servo turntable.
10. A precision servo turntable comprising a U-shaped frame prepared by the method of any one of claims 1 to 9.
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