CN117020754B - Tool and method for detecting geometric precision of numerical control machining center of flexible production line - Google Patents
Tool and method for detecting geometric precision of numerical control machining center of flexible production line Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
Abstract
The invention relates to the technical field of geometric precision detection of numerical control machining centers of flexible production lines, in particular to a geometric precision detection tool and a geometric precision detection method of a numerical control machining center of a flexible production line; the geometric precision detection tool comprises a base, a support column and a cross rectangular block, wherein the first rectangular bar, the second rectangular bar and the third rectangular bar of the cross rectangular block are perpendicular to each other and are intersected in the center, the end parts of the first rectangular bar, the second rectangular bar and the third rectangular bar are used as five rectangular detection heads, the detection tool is fixedly installed on a machine tool exchange workbench of a production line and is matched with a machine tool wireless detection head to detect, so that the regular and rapid detection and the rapid evaluation of the geometric precision change condition of each machine tool linear shaft in the production line are realized, the positioning precision and the repeated positioning precision are regularly detected and rapidly evaluated, the manual repeated labor is avoided, and the machining efficiency and the machining utilization rate are improved.
Description
Technical Field
The invention relates to the technical field of geometric precision detection of numerical control machining centers of flexible production lines, in particular to a geometric precision detection tool and a geometric precision detection method of a numerical control machining center of a flexible production line.
Background
At present, a numerical control machine tool of a flexible production line is commonly used as a geometric precision detection tool of the machine tool, marble is often required to be manually moved during detection of the numerical control machine tool, the marble position is aligned, the machine tool is moved by a magnetometer seat frame dial indicator for detection, the mode is time-consuming and labor-consuming, the processing utilization rate of the machine tool of the flexible production line is directly affected, secondary errors are easily introduced during manual operation, the reliability of the result of the geometric precision detection by manual detection is low, and the machining parts of the machine tool are out of tolerance when serious.
Disclosure of Invention
Aiming at the problems that the reliability of a detection result is low and the machined parts of a machine tool are out of tolerance when the geometric precision of the machine tool is detected manually, the invention provides a geometric precision detection tool and a geometric precision detection method for a numerical control machining center of a flexible production line.
The invention has the following specific implementation contents:
the utility model provides a flexible production line numerical control machining center geometric accuracy detects instrument for with the wireless gauge head cooperation of lathe, including base, support column, cross rectangular piece;
the cross rectangular block is connected to the base through a support column;
the cross rectangular block comprises a first rectangular bar, a second rectangular bar and a third rectangular bar, wherein the first rectangular bar, the second rectangular bar and the third rectangular bar are perpendicular to each other in pairs and are intersected in the center; two ends of the first rectangular strip, the upper end of the second rectangular strip and two ends of the third rectangular strip are used as five rectangular detection heads.
In order to better realize the invention, further, the first rectangular strip comprises a first rectangular detection head and a second rectangular detection head; the second rectangular bar comprises a third rectangular detection head; the third rectangular strip comprises a fourth rectangular detection head and a fifth rectangular detection head;
the fifth rectangular detection head comprises a first detection surface, a second detection surface, a third detection surface, a fourth detection surface and a fifth detection surface;
the first rectangular detection head comprises a sixth detection surface, a seventh detection surface, an eighth detection surface and a ninth detection surface;
the second rectangular detection head comprises a tenth detection surface, an eleventh detection surface, a twelfth detection surface and a thirteenth detection surface;
the third rectangular detection head comprises a fourteenth detection surface, a fifteenth detection surface, a sixteenth detection surface and a seventeenth detection surface;
the fourth rectangular detection head comprises an eighteenth detection surface, a nineteenth detection surface, a twentieth detection surface and a twenty first detection surface.
In order to better realize the invention, the verticality of the adjacent surfaces of the first rectangular detection head, the second rectangular detection head, the third rectangular detection head, the fourth rectangular detection head and the fifth rectangular detection head is less than or equal to 0.005mm/30mm.
In order to better realize the invention, further, the width and the height of the first rectangular strip, the second rectangular strip and the third rectangular strip are equal, and the lengths are ten times as long as the widths.
In order to better realize the invention, the perpendicularity error among the first rectangular strip, the second rectangular strip and the third rectangular strip is less than or equal to 0.015mm/300mm.
In order to better realize the invention, further, the support columns comprise rectangular columns and diagonal support columns;
one end of the rectangular column is fixedly connected to four vertexes of the base, and the other end of the rectangular column is connected with the end part of the oblique support column;
and one end of the diagonal support column, which is not connected with the rectangular column, is connected with the middle symmetrical points of the first rectangular strip, the second rectangular strip and the third rectangular strip.
In order to better implement the invention, further, the height of the rectangular column is equal to the vertical height of the diagonal support column.
In order to better realize the invention, the geometric precision detection tool of the numerical control machining center of the flexible production line is formed by integrally reducing materials of a metal cuboid or adding materials of a machine after 3D material adding printing.
Based on the provided geometric precision detection tool for the numerical control machining center of the flexible production line, in order to better realize the invention, further, a geometric precision detection method for the numerical control machining center of the flexible production line is provided, and the method comprises the following steps:
step 1: fixedly mounting a geometric precision detection tool of a numerical control machining center of the flexible production line on an exchange workbench of a numerical control horizontal machining center of the flexible production line;
step 2: the wireless measuring head of the machine tool is close to the geometric precision detection tool of the numerical control machining center of the flexible production line, and probe calibration is carried out;
step 3: sequentially detecting five rectangular detection heads formed by the end parts of the first rectangular strip, the second rectangular strip and the third rectangular strip to obtain 21 detection values;
step 4: storing the 21 detection values obtained in the step 3, and repeating the step 3 to obtain 21 detection values for the second detection;
step 5: and comparing the detection value of the second detection with the detection value of the first detection, subtracting the first detection value from the second detection value of the same point to obtain a corresponding geometric difference value, and taking the maximum value in all geometric difference values as a geometric precision detection change value.
In order to better implement the present invention, further, the specific operation of step 3 is as follows: the method comprises the steps of firstly detecting the end face and four side faces of a fifth rectangular detection head formed by a third rectangular strip to obtain 5 detection values, then detecting the end face and three side faces of a first rectangular detection head, a second rectangular detection head, a third rectangular detection head and a fourth rectangular detection head to obtain 16 detection values, and finally summarizing the obtained detection values to obtain 21 detection values detected for the first time.
The invention has the following beneficial effects:
(1) The geometric precision detection tool provided by the invention is fixedly arranged on the exchange workbench of the numerical control horizontal machining center of the flexible production line, and is matched with the wireless measuring head of the machine tool to periodically detect the fixed point position on the detection tool, so that the periodic rapid detection of the geometric precision change condition of each linear axis of the machine tool in the production line, the periodic detection rapid evaluation of the positioning precision and the repeated positioning precision are realized, and the manual repeated labor is avoided. And (5) fixedly mounting and permanently using.
(2) According to the invention, the geometric precision detection tool is periodically measured by using the wireless measuring head of the machine tool, the geometric precision variation of the machine tool is evaluated by comparing the detection results, and the automatic and efficient geometric precision detection requirements of various numerical control machining center machine tools are met. The automatic detection of the machine tool is used for replacing manual detection, so that the detection time is shortened, the machining utilization rate of the machine tool is improved, the error influence caused by manual operation is effectively avoided, and the accuracy of the machine tool and the geometric accuracy detection efficiency of the machine tool are improved.
Drawings
FIG. 1 is a schematic diagram of a machine tool exchange table with a geometric accuracy detection tool fixedly mounted on a production line.
Fig. 2 is a schematic diagram of the overall planar structure of the geometric accuracy detecting tool according to the present invention.
Fig. 3 is a schematic diagram of the overall three-dimensional structure of the geometric accuracy detecting tool according to the present invention.
The device comprises a base, a support column, a cross rectangular block, a first rectangular strip, a second rectangular strip, a third rectangular strip, a first rectangular detection head, a second rectangular detection head, a third rectangular detection head, a fourth rectangular detection head, a fifth rectangular detection head, a rectangular column, a third rectangular column, a diagonal support column and a third rectangular detection head, wherein the base is 1, the support column, the cross rectangular block, the first rectangular strip, the second rectangular strip, the third rectangular strip, the first rectangular detection head, the second rectangular detection head, the third rectangular detection head, the fourth rectangular detection head, the fifth rectangular detection head, the rectangular column, the 12, the rectangular column, the 13 and the diagonal support column.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments, and therefore should not be considered as limiting the scope of protection. All other embodiments, which are obtained by a worker of ordinary skill in the art without creative efforts, are within the protection scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; or may be directly connected, or may be indirectly connected through an intermediate medium, or may be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1:
the embodiment provides a geometric precision detection tool of a numerical control machining center of a flexible production line, which is used for being matched with a wireless measuring head of a machine tool and comprises a base 1, a support column 2 and a cross rectangular block 3, wherein the base is provided with a plurality of measuring heads;
the cross rectangular block 3 is connected to the base 1 through a support column 2;
the cross rectangular block 3 comprises a first rectangular strip 4, a second rectangular strip 5 and a third rectangular strip 6, and the first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6 are perpendicular to each other and are intersected in the center; the two ends of the first rectangular bar 4, the upper end of the second rectangular bar 5, and the two ends of the third rectangular bar 6 serve as five rectangular detection heads.
Working principle: according to the embodiment, the geometric precision detection tool comprising the base 1, the support column 2 and the cross rectangular block 3 is arranged, the first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6 of the cross rectangular block 3 are mutually and vertically connected through the middle symmetrical points, the ends of the first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6 form five rectangular detection heads, and the five rectangular detection heads are fixedly arranged on the machine tool exchange workbench of the production line and matched with the machine tool wireless detection heads for detection, so that the regular and rapid detection of the geometric precision change condition of each machine tool linear shaft in the production line, the regular detection and the rapid evaluation of the positioning precision and the repeated positioning precision are realized, the manual repeated labor is avoided, and the machining efficiency and the machining utilization rate are improved.
Example 2:
in this embodiment, as shown in fig. 2 and 3, the first rectangular bar 4 includes a first rectangular detecting head 7 and a second rectangular detecting head 8; the second rectangular bar 5 comprises a third rectangular detection head 9; the third rectangular strip 6 comprises a fourth rectangular detection head 10 and a fifth rectangular detection head 11;
the fifth rectangular detecting head 11 includes a first detecting surface, a second detecting surface, a third detecting surface, a fourth detecting surface, and a fifth detecting surface;
the first rectangular detecting head 7 comprises a sixth detecting surface, a seventh detecting surface, an eighth detecting surface and a ninth detecting surface;
the second rectangular detecting head 8 comprises a tenth detecting surface, an eleventh detecting surface, a twelfth detecting surface and a thirteenth detecting surface;
the third rectangular detecting head 9 includes a fourteenth detecting surface, a fifteenth detecting surface, a sixteenth detecting surface, a seventeenth detecting surface;
the fourth rectangular detecting head 10 includes an eighteenth detecting surface, a nineteenth detecting surface, a twentieth detecting surface, and a twenty first detecting surface.
The support column 2 comprises a rectangular column 12 and an oblique support column 13;
one end of the rectangular column 12 is fixedly connected to four vertexes of the base 1, and the other end of the rectangular column is connected with the end part of the oblique support column 13;
one end of the diagonal support column 13, which is not connected with the rectangular column 12, is connected with the middle symmetrical points of the first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6.
The rectangular posts 12 are equal in height to the vertical height of the diagonal support posts 13.
The verticality of the adjacent surfaces of the first rectangular detection head 7, the second rectangular detection head 8, the third rectangular detection head 9, the fourth rectangular detection head 10 and the fifth rectangular detection head 11 is less than or equal to 0.005mm/30mm.
The first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6 are equal in width and height, and the lengths are ten times the widths.
And the perpendicularity error among the first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6 is less than or equal to 0.015mm/300mm.
The geometric precision detection tool of the numerical control machining center of the flexible production line is formed by integrally reducing materials of a metal cuboid or adding materials of a machine after 3D material adding printing.
Working principle: the embodiment is characterized by being formed by integrally processing a metal cuboid or machining a metal 3D (three-dimensional) after printing, and comprising a base 1, a support column 2 and a cross rectangular block 3. The cross rectangular block 3 uses three rectangular strips which are mutually perpendicular in space as a main structure, two sides of each rectangular strip are used as rectangular detection heads, the three rectangular strips are intersected at a middle symmetrical point, the width and the height of the rectangular strips are equal, the length is ten times of the width, and the intersection of the rectangular strips is provided with a chamfer support for improving the strength. The base 1 is mainly a square flat plate and plays a role in integral support and fixation. The support column 2 is of an integral structure and is formed by jointly connecting rectangular columns 12 and inclined support columns 13, four vertical upward rectangular columns 12 are arranged at four corners of the base 1, the length and the width of each rectangular column 12 are equal to those of rectangular strips in the cross rectangular block 3, four inclined support columns 13 are arranged at the top of each rectangular column 12 and at the center of the cross rectangular block 3 and are mutually intersected at three rectangular strips at middle symmetrical points, and the height of each rectangular column 12 is equal to the vertical height of each inclined support. The structure ensures that the probe of the horizontal machining center machine tool can touch five rectangular detection heads from four directions of the detection tool, and prevents the support column from blocking the probe from touching the cross rectangular block 3, so that the detection cannot be completed.
Other portions of this embodiment are the same as those of embodiment 1 described above, and thus will not be described again.
Example 3:
on the basis of any one of the above embodiments 1 to 2, the embodiment provides a method for detecting geometric accuracy of a numerical control machining center of a flexible production line, which comprises the following steps:
step 1: fixedly mounting a geometric precision detection tool of a numerical control machining center of the flexible production line on an exchange workbench of a numerical control horizontal machining center of the flexible production line;
step 2: the wireless measuring head of the machine tool is close to the geometric precision detection tool of the numerical control machining center of the flexible production line, and probe calibration is carried out;
step 3: sequentially detecting five rectangular detection heads formed by the end parts of the first rectangular strip 4, the second rectangular strip 5 and the third rectangular strip 6 to obtain 21 detection values;
step 4: storing the 21 detection values obtained in the step 3, and repeating the step 3 to obtain 21 detection values for the second detection;
step 5: and comparing the detection value of the second detection with the detection value of the first detection, subtracting the first detection value from the second detection value of the same point to obtain a corresponding geometric difference value, and taking the maximum value in all geometric difference values as a geometric precision detection change value.
The specific operation of the step 3 is as follows: the end face and four side faces of a fifth rectangular detection head 11 formed by a third rectangular strip 6 are detected to obtain 5 detection values, then the end face and three side faces of a first rectangular detection head 7, a second rectangular detection head 8, a third rectangular detection head 9 and a fourth rectangular detection head 10 are detected to obtain 16 detection values, and finally the obtained detection values are summarized to obtain 21 detection values detected for the first time.
Other portions of this embodiment are the same as any of embodiments 1 to 2, and thus will not be described again.
Example 4:
this embodiment will be described in detail with reference to one specific example on the basis of any one of the above embodiments 1 to 3.
The detection process of the geometric precision change value of the linear axis of the numerical control machine tool comprises the following steps:
step 1, first detection:
1) The fifth rectangular detecting head 11 is detected, 5 detecting points are provided on the detecting end face and the four side faces, and the specific detecting procedure for the fifth rectangular detecting head 11 is as follows:
1) meas=1Z-10F 200;
2) Jxjct_5_5= $aa_mm [ Z ];
3）Z5;
4）Y20;
5) meas=1Y-10F 200, measured in the Y direction;
6) Jxjct_5_2= $aa_mm [ Y ];
7）Y20;
8）X-20;
9）Y0;
10 meas=1X-10F 200;
11 Jxjct_5_1= $aa_mm [ X ];
12）X-20;
13）Y-20;
14）X0;
15 meas=1Y-10F 200, measured in the Y direction;
16 Jxjct_5_4 = $aa_mm [ Y ];
17）Y-20;
18）X20;
19）Y0;
20 Meas=1x10f200;
21 Jxjct_5_3= $aa_mm [ X ];
22）X20;
23）Z50;
2) The first rectangular detecting head 7 is detected, four detecting points are provided for the detecting end face and the three side faces, and the specific detecting procedure for the first rectangular detecting head 7 is as follows:
1）G01F2000X-160;
2）Z-150;
3) meas=1X-150F 200, measured in X direction;
4) Jxjct_1_1= $aa_mm [ X ];
5）X-160;
6）Y20;
7) Meas=1y10f200;
8) Jxjct_1_2= $aa_mm [ Y ];
9）Y20;
10）Z-130;
11）Y0;
12 meas=1Z-140F 200;
13 Jxjct_1_3= $aa_mm [ Z ];
14）Z-130;
15）Y-20;
16）Z-150;
17 meas=1Y-10F 200, measured in the Y direction;
18 Jxjct_1_4= $aa_mm [ Y ];
19）Y-20;
20）Z200;
3) Similarly, as described in step 2, the second, third, and fourth rectangular detection heads 8, 9, and 10 are respectively subjected to detection of four detection points on the detection end face and three side faces, and the first, second, third, and fourth rectangular detection heads 7, 8, 9, and 10 are respectively subjected to detection of 16 points in total.
Step 2, storing the 16 values detected in step 1, step 2 and step 3.
TABLE 1 first test result record table
Step 3, detecting for the second time:
repeating the steps 1, 2 and 3 to obtain second detection values of the same 21 detection points:
1) The fifth rectangular detection head 11 is detected, and 5 detection points are provided on the detection end face and four side faces.
2) The first, second, third, and fourth rectangular detection heads 7, 8, 9, and 10 detect four detection points in total on the detection end surface and three side surfaces, respectively, and the first, second, third, and fourth rectangular detection heads 7, 8, 9, and 10 detect 16 points in total.
Step 4, storing second detection values of the 21 detection points:
TABLE 2 second test result record table
Step 5, comparing the results, namely subtracting the first detection value from the second detection value of the same point to obtain a corresponding geometric difference value:
1) 5 detection points of the fifth rectangular detection head 11:
JXJCT_ERROR_5_1=JXJCT_5_6-JXJCT_5_1;
JXJCT_ERROR_5_2=JXJCT_5_7-JXJCT_5_2;
JXJCT_ERROR_5_3=JXJCT_5_8-JXJCT_5_3;
JXJCT_ERROR_5_4=JXJCT_5_9-JXJCT_5_4;
JXJCT_ERROR_5_5=JXJCT_5_10-JXJCT_5_5;
2) 4 detection points of the first rectangular detection head 7:
JXJCT_ERROR_1_1=JXJCT_1_5-JXJCT_1_1;
……
JXJCT_ERROR_1_4=JXJCT_1_8- XJCT_1_4;
3) 4 detection points of the second rectangular detection head 8:
JXJCT_ERROR_2_1=JXJCT_2_5-JXJCT_2_1;
……
JXJCT_ERROR_2_4=JXJCT_2_8-JXJCT_2_4;
4) 4 detection points of the third rectangular detection head 9:
JXJCT_ERROR_3_1=JXJCT_3_5-JXJCT_3_1;
……
JXJCT_ERROR_3_4=JXJCT_3_8-JXJCT_3_4;
5) 4 detection points of the fourth rectangular detection head 10:
JXJCT_ERROR_4_1=JXJCT_4_5-JXJCT_4_1;
……
JXJCT_ERROR_4_4=JXJCT_4_8-JXJCT_4_4;
table 3 table of geometrical difference results
And 6, finding out the maximum value of the geometric differences of 21 detection points of the first rectangular detection head 7, the second rectangular detection head 8, the third rectangular detection head 9, the fourth rectangular detection head 10 and the fifth rectangular detection head 11 as a geometric precision change value of the machining center machine tool.
Other portions of this embodiment are the same as any of embodiments 1 to 3, and thus will not be described again.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (9)
1. The geometric precision detection tool of the numerical control machining center of the flexible production line is used for being matched with a wireless measuring head of a machine tool and is characterized by comprising a base (1), a support column (2) and a cross rectangular block (3);
the cross rectangular block (3) is connected to the base (1) through the support column (2);
the cross rectangular block (3) comprises a first rectangular bar (4), a second rectangular bar (5) and a third rectangular bar (6), wherein the first rectangular bar (4), the second rectangular bar (5) and the third rectangular bar (6) are perpendicular to each other and are intersected in the center; two ends of the first rectangular strip (4), the upper end of the second rectangular strip (5) and two ends of the third rectangular strip (6) are used as five rectangular detection heads.
2. The tool for detecting geometric precision of a numerical control machining center of a flexible production line according to claim 1, wherein the perpendicularity of adjacent surfaces of the five rectangular detection heads is less than or equal to 0.005mm/30mm.
3. The geometric precision detection tool for the numerical control machining center of the flexible production line according to claim 1, wherein the widths and the heights of the first rectangular strip (4), the second rectangular strip (5) and the third rectangular strip (6) are equal, and the lengths are ten times the widths.
4. The geometric precision detection tool for the numerical control machining center of the flexible production line according to claim 1, wherein the perpendicularity error among the first rectangular strip (4), the second rectangular strip (5) and the third rectangular strip (6) is less than or equal to 0.015mm/300mm.
5. A flexible production line numerical control machining center geometric accuracy detection tool according to claim 1, wherein the support column (2) comprises a rectangular column (12) and an oblique support column (13);
one end of the rectangular column (12) is fixedly connected to four vertexes of the base (1), and the other end of the rectangular column is connected with the end part of the inclined support column (13);
one end of the diagonal support column (13) which is not connected with the rectangular column (12) is connected with the middle symmetrical points of the first rectangular strip (4), the second rectangular strip (5) and the third rectangular strip (6).
6. A tool for detecting geometric accuracy of a numerically controlled machining center for flexible production lines according to claim 5, wherein the height of the rectangular column (12) is equal to the vertical height of the diagonal support column (13).
7. The flexible production line numerical control machining center geometric accuracy detection tool according to any one of claims 1 to 6, wherein the flexible production line numerical control machining center geometric accuracy detection tool is formed by metal cuboid integral material reduction machining or metal 3D additive printing post-machine material addition and reduction machining.
8. A method for detecting geometric precision of a numerical control machining center of a flexible production line, which is realized based on the geometric precision detection tool of the numerical control machining center of the flexible production line according to claim 1; the method is characterized by comprising the following steps of:
step 1: fixedly mounting a geometric precision detection tool of a numerical control machining center of the flexible production line on an exchange workbench of a numerical control horizontal machining center of the flexible production line;
step 2: the wireless measuring head of the machine tool is close to the geometric precision detection tool of the numerical control machining center of the flexible production line, and probe calibration is carried out;
step 3: sequentially detecting five rectangular detection heads formed by the end parts of the first rectangular strip (4), the second rectangular strip (5) and the third rectangular strip (6) to obtain 21 detection values;
step 4: storing the 21 detection values obtained in the step 3, and repeating the step 3 to perform second detection to obtain 21 detection values of the second detection;
step 5: comparing the detection value of the second detection with the detection value of the first detection, subtracting the detection value of the first detection from the detection value of the second detection of the same detection point to obtain a corresponding geometric difference, and taking the maximum value in all geometric differences as a geometric precision change value.
9. The method for detecting geometric accuracy of a numerical control machining center of a flexible production line according to claim 8, wherein the specific operation of the step 3 is as follows: firstly, detecting the end face and four side faces of a fifth rectangular detection head (11) formed by a third rectangular strip (6) to obtain 5 detection values, then detecting the end face and three side faces of a first rectangular detection head (7), a second rectangular detection head (8), a third rectangular detection head (9) and a fourth rectangular detection head (10) to obtain 16 detection values, and finally summarizing the obtained detection values to obtain 21 detection values of the first detection.
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