CN117564131B - Motor screw straightening method based on visual detection control system - Google Patents

Motor screw straightening method based on visual detection control system Download PDF

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Publication number
CN117564131B
CN117564131B CN202410067349.0A CN202410067349A CN117564131B CN 117564131 B CN117564131 B CN 117564131B CN 202410067349 A CN202410067349 A CN 202410067349A CN 117564131 B CN117564131 B CN 117564131B
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screw
motor
control system
visual detection
detection control
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CN117564131A (en
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张娟娟
严平
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Tritex Corp
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Tritex Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention relates to a motor screw straightening method based on a visual detection control system, which comprises the following steps of S1, assembling a motor to be tested on a straightening platform; s2, the visual detection control system judges whether the actual outer diameter of the screw is in the range of a theoretical screw large diameter lower limit value dmin and a screw large diameter upper limit value dmax, if the actual outer diameter of the screw is not in the range of the theoretical screw large diameter lower limit value dmax, the screw is unqualified, and detection is stopped; s3, if the visual detection control system judges that the collected maximum outline excircle area exceeds the screw theoretical qualified maximum outline area, the screw is inclined and the inclination amount is unqualified; s4, the vision detection control system calculates a corrected screw maximum contour area of the screw due to rebound according to the screw theoretical qualified maximum contour area; and S5, controlling the straightening platform to work to apply force to the screw rod to straighten according to the calculation result of the S4 by the visual detection control system. The invention can improve the straightness and full-jump precision of the screw rod connected with the motor.

Description

Motor screw straightening method based on visual detection control system
Technical Field
The invention relates to the field of motors, in particular to a motor screw straightening method based on a visual detection control system.
Background
In the field of automation at present, an actuator for converting electric pulses into angular displacement and position displacement by using a screw nut transmission by an external drive stepping motor is widely applied to industrial equipment and plays an important role.
Because the straightness of the motor screw rod, the full run-out directly affects the transmission precision, even if the machining precision of each part in the motor meets the requirement of a drawing, the screw rod connected with the electronic rotor can be inclined due to the influence of the assembly precision, such as the installation clearance between the parts, the assembly precision of a bearing for supporting the rotor and the like, and if the inclination exceeds a tolerance value, the transmission precision of the screw rod can not meet the requirement of high-precision transmission.
Based on the above, for the place with high transmission precision requirement, the motor with the screw rod must be detected and aligned before leaving the factory. The traditional detection mode adopts a micrometer to measure the screw rod, and whether alignment is needed and the corresponding alignment amount are obtained after the measurement is completed. Because the micrometer gauge outfit itself has certain thrust, manual detection, the precision is low, and is inefficiency.
Publication number CN108620832A discloses a long rod bolt straightening device and a method, and the straightening process of the method is as follows: starting linkage, normally starting up, conveying batch bolts from the bolt feeding track to the feeding mechanism, pushing the bolts to the ends of the second straightening plate and the second tooth rubbing plate of the fixed plate through the pushing knife, and carrying out straightening and tooth rubbing operation on the bolts by matching with the back and forth movement of the first straightening plate and the first tooth rubbing plate of the movable plate, wherein the processed bolts automatically fall into the bolt discharge holes.
Obviously, the alignment process is to complete the corresponding alignment work through the combined action of the alignment plate and the thread rolling plate. The method is to straighten the bolt by means of rigid cold extrusion, which obviously belongs to the machining process of the screw, and the straightening device is inapplicable because the straightening plate needs to clamp the screw for the screw connected with the motor. For the molded product assembled by the screw and the motor, the conventional alignment mode is still adopted, namely, alignment is carried out after detection by manually adopting a micrometer.
Disclosure of Invention
The invention provides a motor screw straightening method based on a visual detection control system, which can improve the straightness and full-jump precision of a screw connected with a motor.
A motor screw straightening method based on a visual detection control system comprises the following steps:
s1, assembling a motor to be tested on a straightening platform, electrically connecting a visual detection control system with the motor, acquiring parameters of the motor by the visual detection control system, calling parameters of a screw to be tested from a database according to the parameters of the motor, and calculating a theoretical screw diameter lower limit value dmin and a screw diameter upper limit value dmax on the screw according to the parameters of the screw by the visual detection control system;
s2, a visual detection control system controls a motor to work, the motor drives a screw rod connected with the motor to rotate, the visual detection control system collects the actual outer diameter of a screw thread on the screw rod and the outer circle area of the maximum outline, the visual detection control system judges whether the actual outer diameter of the screw thread is in the range of a theoretical screw thread large diameter lower limit value dmin and a screw thread large diameter upper limit value dmax, if the judgment result is negative, the screw rod is unqualified, and detection is stopped;
s3, if the screw is qualified in the S2, after the visual detection control system calculates a theoretical qualified maximum outline area of the screw, if the visual detection control system judges that the collected maximum outline excircle area exceeds the theoretical qualified maximum outline area of the screw, the screw is inclined and the inclination amount is unqualified;
s4, the vision detection control system calculates a corrected screw maximum contour area of the screw due to rebound according to the screw theoretical qualified maximum contour area;
and S5, controlling the straightening platform to work to apply force to the screw rod to straighten according to the calculation result of the S4 by the visual detection control system, so that the part of the screw rod extending out of the motor falls into the maximum profile area of the correction screw rod.
After the data of the screw is acquired through the visual detection control system, the outer diameter of the screw to be detected is judged to be qualified through the calculation method, the detection is directly stopped for the screw with the unqualified outer diameter, whether the inclination amount of the screw with the qualified outer diameter is in a qualified area is further judged through the calculation, and if the screw is not in the qualified area, the straightening platform is controlled to work for straightening the screw. The method greatly improves the straightness and full run-out of the screw rod, and has the advantages of improving the motor precision, along with wide application range and high efficiency. In addition, the visual detection control system can be connected with a display generally, so that corresponding data can be directly displayed through the display in the detection and alignment processes, and visual detection is realized.
In addition, in the detection and calculation process, the applicant integrates the data and the method into an automatic visual detection control system by means of the empirical data manually detected by the applicant and the method for obtaining the empirical data, and provides good help for improving the detection accuracy and efficiency.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a perspective view of an alignment platform and vision inspection control system with a screw motor.
Fig. 3 is a top view of the alignment platform and vision inspection control system with screw motor.
Fig. 4 is an assembly view of the motor and screw.
Fig. 5 is an enlarged view of the Q portion (before the screw is misaligned) in fig. 4.
Fig. 6 is an enlarged view of a portion of the screw after alignment.
Detailed Description
As shown in fig. 1 to 6, the motor screw straightening method based on the visual detection control system of the invention comprises the following steps:
s1, a motor A to be measured is assembled on a straightening platform, a visual detection control system is electrically connected with the motor A, the visual detection control system obtains parameters of the motor A, and parameters of a screw B to be measured are called out from a database according to the parameters of the motor A, the parameters of the screw B comprise a thread major diameter d, a thread pitch P, a screw extending length L and a full run-out ratio a on the screw B, and the thread major diameter d, the thread pitch P, the screw extending length L and the full run-out ratio a are given parameters of the screw B on the motor A with corresponding models, namely, the parameters are all corresponding to fixed values. And the visual detection control system calculates a theoretical thread major diameter lower limit value dmin and a thread major diameter upper limit value dmax on the screw B according to the parameters of the screw B.
The alignment platform in this embodiment includes: the motor fixing seat 1 is used for fixing the motor A, and the first driving mechanism 2 is positioned on one side of the motor fixing seat 1; the second actuating mechanism 3 is located the opposite side of motor fixing base 1, and after motor A is fixed with motor fixing base 1, screw rod B is located between first actuating mechanism 2 and the second actuating mechanism 3, and first actuating mechanism 2 and second actuating mechanism 3 can adopt the linear drive such as cylinder, hydro-cylinder, electronic lead screw, sharp module, and in this embodiment, the preferred straight line module that adopts has the advantage of high accuracy owing to straighten the less screw rod of tilting volume to the straight line module has the demand of high-accuracy removal in the alignment process is satisfied.
The first alignment driver 4 is matched with the first driving mechanism 2, and the first alignment driver 4 is driven to move by the first driving mechanism 2. The second straightening driver 5 is matched with the second driving mechanism 3, and the second straightening driver 5 is driven to move by the second driving mechanism 3. The first and second straightening drivers 4 and 5 each employ a linear driver, for example, a linear motor.
The visual detection control system comprises a visual detection unit 6 and a control unit 7 for acquiring images of the screw B, wherein the visual detection unit 6 consists of a bracket and a visual detection CCD (industrial camera), the visual detection unit 6 is positioned above the motor fixing seat 1, namely, the visual detection CCD is supported by the bracket and then positioned above the motor fixing seat 1 and the screw B, the visual detection units 6 can be multiple, and the visual detection units 6 are arranged at intervals along the axial direction of the screw B.
The control unit 7 is electrically connected with the visual detection unit 6, the control unit 7 can adopt an industrial personal computer, the control unit 7 is electrically connected with the visual detection unit 6, the motor A, the first driving mechanism 2, the second driving mechanism 3, the first straightening driver 4 and the second straightening driver 5 respectively, and the control unit 7 analyzes and calculates signals collected by the screw B according to the visual detection unit 6, so that control instructions are output to the motor A, the first driving mechanism 2, the second driving mechanism 3, the first straightening driver 4 and the second straightening driver 5.
In S1, a two-dimensional code is attached to a motor A, basic information of the motor A is obtained by scanning the two-dimensional code and is led into a visual detection control system, the basic information of the motor A comprises a motor model, voltage and resistance, and the visual detection control system calls out relevant parameters of a screw B connected with the motor from a database according to the motor model specification, wherein the relevant parameters of the screw B comprise a thread major diameter d, a thread pitch P, a screw extending length L, a full run-out ratio a and the like. The threads corresponding to the parameters in the following formulas refer to the threads on the screw B.
In S1, the process of calculating the theoretical thread major diameter lower limit dmin and the thread major diameter upper limit dmax includes:
s11, calculating basic deviation：
…………………………（1）
In the above-mentioned method, the step of,basic deviation->For the first pitch coefficient, +>Is the pitch of the threads on the screw.
First pitch coefficientFor the empirical value accumulated by the applicant, a first pitch coefficient +.>Related to pitch, first pitch coefficient->Selected as in table 1.
TABLE 1
Pitch P (unit: mm) k1
P≤0.5 10
0.5< P≤1.2 0
P >1.2 -10
For example, p=1.58, k1= -10, substituting formula (1) yields es= -0.0158≡0.016mm.
S12, calculating the large diameter tolerance of the thread：
……………（2）
In the above-mentioned method, the step of,for large diameter tolerance of screw thread->A second pitch coefficient +.>For the empirical value accumulated by the applicant, a second pitch coefficient +.>Related to pitch, second pitch coefficient->Selected as in table 2.
TABLE 2
Pitch P (unit: mm) k2
P≤1 0.4
1<P≤2 0.3
P>2 0.25
For example, when p=1.58, k2=0.3 is substituted into formula (2), resulting in t=0.072 mm.
S13, calculating deviation under large diameter of the thread：
……………………………（3）
In the above-mentioned method, the step of,is the deviation under the large diameter of the thread;
substituting the above es= -0.016 and t=0.072 into formula (3), ei= -0.016-0.072= -0.088.
S14, calculating the lower limit value of the major diameter of the screw:
…………………………（4）
In the above-mentioned method, the step of,the thread is large in diameter;
for example, d=6.35 mm (a large diameter value of the screw obtained by the visual inspection control system according to the motor model), ei= -0.088 is substituted into formula (4), dmin=6.35-0.088= 6.262mm.
S15, calculating the upper limit value of the major diameter of the thread：
…………………………（5）。
For example, substituting d=6.35 mm, es= -0.016 into equation (5) gives dmax= 6.334mm.
S2, the visual detection control system controls the motor A to work, the motor A drives the screw rod B connected with the motor A to rotate, the rotation can be one circle or a plurality of circles, the visual detection control system collects the actual outer diameter ds of the screw rod B and the maximum outline excircle area dm1, the visual detection control system judges whether the actual outer diameter ds of the screw rod is in the range of the theoretical thread large diameter lower limit value dmin and the thread large diameter upper limit value dmax (as shown in fig. 5), if the judgment result is negative, the screw rod B is unqualified, and the detection is stopped.
The theoretical thread large diameter lower limit value dmin and the thread large diameter upper limit value dmax are obtained through calculation, so if the actual measured thread outer diameter ds is judged to fall into the range of the theoretical thread large diameter lower limit value dmin and the thread large diameter upper limit value dmax, the screw B is matched with the motor, and the screw B is qualified; if the actual outer diameter ds of the actually measured screw thread is judged to be out of the range of the theoretical screw thread large diameter lower limit value dmin and the screw thread large diameter upper limit value dmax, the surface screw rod B is not matched with the motor, the screw rod B is unqualified, detection is stopped, and the motor A needs to be returned to an assembly workshop for assembly again after disassembly.
For unqualified screw rod B, assembly errors may be caused during assembly, for example, a first screw rod which is supposed to be installed on a first type motor is installed on a second type motor, a second screw rod which is supposed to be installed on the second type motor is installed on the first type motor, at this time, the screw rods on the two motors are unqualified, so that in the detection process, the situation needs to be detected and judged, otherwise, the motor after delivery cannot meet the transmission requirement during the use.
S3, if the screw B is qualified in the S2, as shown in FIG. 5, after the visual detection control system calculates the theoretical qualified maximum contour area da1 of the screw, if the visual detection control system judges that the collected maximum contour excircle area dm1 exceeds the theoretical qualified maximum contour area da1 of the screw, the screw B is inclined and the inclination amount is unqualified.
In S3, judging whether the screw B exceeds the screw theoretical qualified maximum contour area da1 according to the maximum contour excircle area dm1, wherein the process is as follows:
s31, calculating the full run-out value to be met by the screw B：
…………………………（6）
In the above-mentioned method, the step of,for the total run-out value of the screw, +.>For the extension length of the screw>Is the ratio of full run out;
for example, the extension length l=100 mm of the screw B, the full run-out ratio a=1%o, and r=0.95×100×1%o=0.095 mm is obtained by substituting the formula (6);
s32, calculating the actual total run-out value of the screw B：
………………………………（7）
In the above-mentioned method, the step of,the actual total run-out value of the screw;
in this embodiment, for example, an actual outer diameter ds of the screw thread measured is 6.30mm, and an actual maximum profile outer circle area dm1 measured is 6.60mm, which is substituted into formula (7), to obtain r1=0.3 mm.
S33, willAnd->Comparing if->If the screw is qualified in total run-out, if +.>And obtaining that the screw B exceeds the screw theoretical qualified maximum contour area da1 and straightening is needed.
As shown in fig. 5, since the calculated value of 0.3mm (value of R1) is greater than 0.095mm (value of R), it is found that the maximum profile outer circle region dm1 of the screw B has been acquired beyond the screw theoretical acceptable maximum profile region da1, indicating that the screw B is inclined and the amount of inclination is unacceptable.
S4, the vision detection control system calculates a corrected screw maximum profile area da2 of the screw B due to rebound according to the screw theoretical qualified maximum profile area da 1.
In this embodiment, when the aligned screw B is considered to be qualified, but the aligned screw B may rebound after being placed for a period of time, which may cause the maximum profile outer circle area dm1 of the aligned screw B to exceed the theoretical acceptable maximum profile area da1 of the screw, so that the rebound of the aligned screw B is considered during the actual alignment operation, and therefore, the corrected screw maximum profile area da2 of the rebound of the screw B needs to be calculated.
In S3 and S4, the calculation process of the screw theoretical acceptable maximum profile area da1 and the correction screw maximum profile area da2 is as follows:
s41, calculating a screw theoretical qualification maximum profile area da1:
………………………………（8）
using the actual measured thread outer diameter ds=6.30 mm in S32 and r=0.095 in S31 substituting formula (8) yields da1= 6.395mm.
S42, calculating a maximum profile area da2 of the correction screw:
……………………………（9）
..（10）
in the above-mentioned formula(s),for safety factor->For rebound quantity, add>Is the rebound quantity of screw B No. 1 after being straightened and placed for 96 hours, and is sequentially +.>The rebound quantity after the n-number screw B is straightened and placed for 96 hours; />Is the actual jumping value after the straightening of the screw B No. 1, and is +.>The actual jumping value after the n-number screw rod B is straightened; />The actual jumping value after the screw B No. 1 is placed for 96 hours is sequentially +.>The actual run-out value after 96 hours was set for screw B No. n.
A large amount of test data is collected in the visual inspection control system database, and according to different screw outer diameters, different screw lengths, and the rebound data after 24 hours, 48 hours, 72 hours and 96 hours are calibrated and displaced, as shown in the following table 3.
Table 3 (Unit: mm)
According to the above, the actual total run-out value measured at the time of alignment meets the requirement, but is larger than the actual value measured at the time of alignment due to rebound factors after 24 hours, 48 hours, 72 hours and 96 hours.
According to the measured data pairs of 96 hours listed in Table 3 aboveCalculation is performed (i.e. a->It can also be regarded as an empirical value obtained by the applicant using the above formula (10), and substituting the data in table 3 into formula (10) results in α=max { (0.105-0.08), (0.1-0.08), (0.09-0.07) } =0.025 mm.
In the above formula (9), f is a safety factor, and in order to ensure stable operation of the product at the client, the safety factor f is defined according to the extension length L of the screw, see table 4 below.
TABLE 4 Table 4
L(mm) f
≤100 1.1
100~300 1.08
300~500 1.05
>500 1.02
If the screw extension length l=100 mm, f=0.98, substituting the above α=0.025 and da1= 6.395mm into formula (9) yields: da2 = 6.395-1.1 x 0.025 = 6.3675 ≡ 6.367mm (here three decimal places are reserved for stability, the latter decimal places being directly truncated).
And S5, controlling the straightening platform to work to apply force to the screw rod B to straighten according to the calculation result of the S4 by the visual detection control system, so that the part of the screw rod B extending out of the motor falls into the maximum profile area da2 of the correction screw rod.
Step S5 includes S51, where the vision detection control system controls the first driving mechanism 2 to drive the first straightening driver 4 to operate to a position corresponding to the position of the screw B beyond the maximum profile area da2 of the correction screw, the second straightening driver 5 operates to the root of the screw B extending outside the motor a, the second straightening driver 5 supports the root of the screw B, and the first straightening driver 4 applies a force to the screw B so that the portion of the screw B extending outside the motor falls into the maximum profile area da2 of the correction screw.
S511, when the first alignment driver 4 finishes applying force to the screw B once, the motor a drives the screw B to rotate by an angle, for example, 30 °, 45 °, 60 °, and so on, the visual detection control system collects the outer circle area dm1 of the maximum profile of the screw B, and re-determines whether there is a portion exceeding the maximum profile area da2 of the correction screw on the screw B, if so, calculates the height h of the outer circle area dm1 of the maximum profile of the screw B exceeding the maximum profile area da2 of the correction screw, and applies force to the exceeded portion according to step S51 until the screw B does not have a portion exceeding the maximum profile area da2 of the correction screw at least after one rotation of the screw B.
Calculating the calibration quantity of the first alignment driver 4 from the height h：
……………………………………（11）
In the above-mentioned method, the step of,for the calibration factor +.>The formula of (2) is as follows:
………（12）
to->For the actual calibration after each rebound, +.>To->For each calibration of the motor travel,/->Is the total number of calibrations.
In the invention, a large amount of test data are collected in a visual detection control system database, and according to different screw outer diameters, different screw lengths, displacement to be calibrated, motor stroke and actual displacement after screw rebound are calibrated, as exemplified in table 5.
Table 5 (Unit: mm)
Screw serial number Screw outside diameter specification d Screw length L Displacement h to be calibrated Calibrating motor travel hm Actual calibration amount hz after rebound
1 6.35 100 0.05 0.06 0.04
2 6.35 100 0.05 0.07 0.045
3 6.35 100 0.05 0.075 0.05
4 6.35 100 0.1 0.12 0.08
5 6.35 100 0.1 0.13 0.085
6 6.35 100 0.1 0.14 0.095
7 6.35 100 0.1 0.15 0.105
Substituting the data in the table into formula (12) to obtain:
if the vision acquisition system acquires h=0.15 mm, substituting the h=0.668 into formula (11) together with g=0.225×0.23 (to ensure efficient calibration, two decimal places are reserved here, and the third digit advances by one), the first alignment driver 4 operates to push the screw B by operating h1 as calculated above to be 0.23mm, so as to align the screw B. S511 is repeated each time the first alignment driver 4 completes applying force to the screw B.
The screw B straightened by the method is rechecked after being placed for 24 hours, 48 hours and 96 hours, and the actual contour area da3 after the screw straightening is shown in fig. 6, and the actual contour area da3 after the screw straightening and the actual external diameter ds of the screw thread are all within the range of the theoretical qualified maximum contour area da1 of the screw, thereby proving that the method is feasible.

Claims (3)

1. The motor screw straightening method based on the visual detection control system is characterized by comprising the following steps of:
s1, a motor (A) to be measured is assembled on a straightening platform, a visual detection control system is electrically connected with the motor (A), the visual detection control system obtains parameters of the motor (A), parameters of a screw (B) to be measured are called out from a database according to the parameters of the motor (A), and the visual detection control system calculates a theoretical screw thread major diameter lower limit value dmin and a screw thread major diameter upper limit value dmax on the screw (B) according to the parameters of the screw (B);
s2, controlling a motor (A) to work by a visual detection control system, wherein the motor (A) drives a screw rod (B) connected with the motor (A) to rotate, the visual detection control system collects the actual outer diameter ds of a screw thread on the screw rod (B) and the maximum outline outer circle area dm1, and judges whether the actual outer diameter ds of the screw thread is in the range of a theoretical screw thread large diameter lower limit value dmin and a screw thread large diameter upper limit value dmax or not, if the judgment result is negative, the screw rod (B) is unqualified, and the detection is stopped;
s3, if the screw (B) is qualified in the S2, after the visual detection control system calculates a theoretical qualified maximum contour area da1 of the screw, if the visual detection control system judges that the collected maximum contour excircle area dm1 exceeds the theoretical qualified maximum contour area da1 of the screw, the screw (B) is inclined and the inclination amount is unqualified;
s4, the vision detection control system calculates a corrected screw maximum profile area da2 of the screw (B) due to rebound according to the screw theoretical qualified maximum profile area da 1;
s5, according to the calculation result of the S4, the visual detection control system controls the straightening platform to work to apply force to the screw rod (B) so as to straighten, so that the part of the screw rod (B) extending out of the motor falls into a correction screw rod maximum profile area da2;
in S1, the straightening platform includes:
a motor fixing seat (1);
the first driving mechanism (2), the first driving mechanism (2) is located at one side of the motor fixing seat (1);
the second driving mechanism (3), the second driving mechanism (3) is located on the other side of the motor fixing seat (1);
a first alignment driver (4) which is matched with the first driving mechanism (2) and is driven to move by the first driving mechanism (2);
a second straightening driver (5) which is matched with the second driving mechanism (3) and is driven to move by the second driving mechanism (3);
in S1, the process of calculating the theoretical thread major diameter lower limit dmin and the thread major diameter upper limit dmax includes:
s11, calculating basic deviation：
…………………………（1）
In the above-mentioned method, the step of,is basic deviation +.>For the first pitch coefficient, +>Is the pitch of the threads on the screw;
s12, calculating the large diameter tolerance of the thread：
……………（2）
In the above-mentioned method, the step of,for large diameter tolerance of screw thread->Is a second pitch coefficient;
s13, calculating deviation under large diameter of the thread：
……………………………（3）
In the above-mentioned method, the step of,is the deviation under the large diameter of the thread;
s14, calculating the lower limit value of the major diameter of the screw：
…………………………（4）
In the above-mentioned method, the step of,the thread is large in diameter;
s15, calculating the upper limit value of the major diameter of the thread：
…………………………（5）；
In S3, judging whether the screw (B) exceeds the theoretical qualified maximum contour area da1 of the screw according to the maximum contour excircle area dm1, wherein the process is as follows:
s31, calculating the total run-out value required to be met by the screw (B)：
…………………………（6）
In the above-mentioned method, the step of,for the total run-out value of the screw, +.>For the extension length of the screw>Is the ratio of full run out;
s32, calculating the actual total run-out value of the screw (B)：
………………………………（7）
In the above-mentioned method, the step of,the actual total run-out value of the screw;
s33, willAnd->In contrast, if->If the screw is qualified in total run-out, if +.>Obtaining that the screw (B) exceeds a theoretical qualified maximum contour area da1 of the screw and straightening the screw;
in S3 and S4, the calculation process of the screw theoretical acceptable maximum profile area da1 and the correction screw maximum profile area da2 is as follows:
s41, calculating a screw theoretical qualification maximum profile area da1:
………………………………（8）
s42, calculating a maximum profile area da2 of the correction screw:
……………………………（9）
.（10）
in the above-mentioned formula(s),for safety factor->For rebound quantity, add>The rebound amount after 96 hours of standing after straightening the screw (B) of the No. 1 is sequentially +.>The rebound quantity after the n-number screw rod (B) is straightened and placed for 96 hours; />Is the actual jumping value after the straightening of the screw (B) of the No. 1, and is sequentially +.>The actual jumping value after the n-number screw rod (B) is straightened; />For the actual run-out value after 96 hours of screw (B) No. 1, in order +.>The actual jumping value after the n-number screw rod (B) is placed for 96 hours;
the step S5 comprises the following steps: s51, the vision detection control system controls the first driving mechanism (2) to drive the first straightening driver (4) to run to a position corresponding to the position of the screw (B) beyond the maximum profile area da2 of the correction screw, the second straightening driver (5) runs to the root part of the screw (B) extending out of the motor (A), the second straightening driver (5) supports the root part of the screw (B), and the first straightening driver (4) applies force to the screw (B) to enable the part of the screw (B) extending out of the motor to fall into the maximum profile area da2 of the correction screw;
and (3) after the first straightening driver (4) finishes applying force to the screw (B) once, the motor (A) drives the screw (B) to rotate by an angle, the visual detection control system collects the maximum outline outer circle region dm1 of the screw (B) and re-judges whether a part exceeding the maximum outline region da2 of the correction screw exists on the screw (B), if so, the height (h) of the maximum outline outer circle region dm1 of the screw (B) exceeding the maximum outline region da2 of the correction screw is calculated, and the excessive part is applied with force according to the step S51 until the screw (B) does not exist on the screw (B) beyond the maximum outline region da2 of the correction screw at least after rotating for one circle.
2. The method for aligning a motor screw based on a vision inspection control system of claim 1, wherein the vision inspection control system comprises:
a visual detection unit (6) for image acquisition of the screw (B), wherein the visual detection unit is positioned above the motor fixing seat (1);
and the control unit (7), the control unit (7) is electrically connected with the visual detection unit (6).
3. The motor screw straightening method based on a visual inspection control system according to claim 1, characterized in that the calibration amount of the first straightening driver (4) is calculated according to the height (h)：
……………………………………（11）
In the above-mentioned method, the step of,for the calibration amount +.>Is a calibration coefficient;
………（12）
to->For the actual calibration after each rebound, +.>To->For each calibration of the motor travel,/->Is the total number of calibrations.
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