CN111580455B - Method for evaluating reliability of positioning precision of numerical control equipment - Google Patents
Method for evaluating reliability of positioning precision of numerical control equipment Download PDFInfo
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- CN111580455B CN111580455B CN202010507383.7A CN202010507383A CN111580455B CN 111580455 B CN111580455 B CN 111580455B CN 202010507383 A CN202010507383 A CN 202010507383A CN 111580455 B CN111580455 B CN 111580455B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/34—Director, elements to supervisory
- G05B2219/34242—For measurement only
Abstract
The embodiment of the invention provides a method for evaluating the reliability of positioning accuracy of numerical control equipment, and relates to the technical field of numerical control equipment. The method for evaluating the reliability of the positioning accuracy of the numerical control equipment comprises the steps of detecting the position error of a movement axis of the numerical control equipment in the movement process in a preset stroke; acquiring a position error once every preset time; and evaluating the positioning accuracy of the motion axis according to the plurality of position errors. In the embodiment of the invention, the positioning accuracy is estimated according to the collected position errors, so that the reliability of estimation can be improved.
Description
Technical Field
The invention relates to the technical field of numerical control equipment, in particular to a method for evaluating the positioning accuracy reliability of numerical control equipment.
Background
The numerical control machine tool is important basic equipment for machine manufacturing, consists of a processing program carrier, a numerical control device, a servo driving device, a machine tool main body, other auxiliary devices and the like, belongs to mechanical, electronic, hydraulic, computer, measurement, microelectronic and other integrated precise and complex equipment, and is widely applied to the fields of automobiles, aerospace, communication, nuclear power, rail transit, mechanical manufacturing and the like. The reliability of the positioning precision of the numerical control machine tool is an important index for measuring the machining performance of the machine tool.
Disclosure of Invention
The invention aims to provide a positioning accuracy reliability assessment method of numerical control equipment, which can improve the reliability of positioning accuracy assessment.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention discloses a method for evaluating the reliability of the positioning precision of numerical control equipment, which comprises the following steps:
detecting the position error of the movement axis of the numerical control equipment in the movement process within a preset stroke;
collecting the position error once every preset time;
and evaluating the positioning accuracy of the motion axis according to a plurality of position errors.
In an alternative embodiment of the present invention, the step of estimating the positioning accuracy of the movement axis based on the plurality of position errors comprises:
in the movement process of the movement axis, stopping for an interval time after each movement interval distance, wherein the interval time is longer than the preset time;
screening out the position error and the position information of the corresponding movement axis, which are acquired when the movement axis stops, from the plurality of position errors;
evaluating the positioning accuracy of the movement axis from a plurality of the position errors with the position information.
In an alternative embodiment of the present invention, the step of estimating the positioning accuracy of the movement axis based on a plurality of the position errors having the position information comprises:
drawing a position error characteristic curve according to the position information and the position error;
and analyzing the positioning precision according to the position error characteristic curve, and evaluating and adjusting the positioning precision.
In an optional embodiment of the present invention, the method for evaluating reliability of positioning accuracy of a numerical control device further includes:
the numerical control equipment reciprocates for multiple times within the preset stroke;
recording time information of the numerical control equipment during one-time movement;
and evaluating the positioning precision of the motion axis according to the time information and the position errors.
In an alternative embodiment of the present invention, the step of estimating the positioning accuracy of the motion axis according to a plurality of the time information and a plurality of the position errors comprises:
screening the position error corresponding to a preset position in the time information from the time information and the position errors;
evaluating the positioning accuracy of the movement axis from the position error with time information.
In an alternative embodiment of the present invention, the step of estimating the positioning accuracy of the movement axis from the position error with time information comprises:
drawing a time error characteristic curve at the preset position according to the time information and the position error;
and analyzing the positioning precision according to the time error characteristic curve, and evaluating and adjusting the positioning precision.
In an alternative embodiment of the present invention, the preset position is plural, and the step of estimating the positioning accuracy of the movement axis according to the position error with time information further includes:
and analyzing the positioning accuracy according to a plurality of time error characteristic curves, and evaluating and adjusting the positioning accuracy.
In an optional embodiment of the present invention, the method for evaluating the reliability of the positioning accuracy of the numerical control device includes:
and detecting the position error of the movement axis of the numerical control equipment in the movement process in the preset stroke at a preset temperature.
In an optional embodiment of the present invention, the step of detecting a position error of the movement axis of the numerical control device during the movement process includes:
the laser interferometer detects the actual stroke of the motion axis in the motion process; the reflecting mirror of the laser interferometer moves along the movement axis, and the optical path of the laser interferometer is parallel to the movement axis of the numerical control equipment;
and calculating the position error according to the actual stroke and the preset stroke.
In an alternative embodiment of the invention, the maximum number of cycles of the laser interferometer is greater than the number of movements of the numerical control device.
The embodiment of the invention has the following beneficial effects: the method for evaluating the reliability of the positioning accuracy of the numerical control equipment comprises the steps of detecting the position error of a movement axis of the numerical control equipment in the movement process in a preset stroke; acquiring a position error once every preset time; and evaluating the positioning accuracy of the motion axis according to the plurality of position errors. In the embodiment of the invention, the positioning accuracy is estimated according to the collected position errors, so that the reliability of estimation can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a method for evaluating reliability of positioning accuracy of a numerical control device according to an embodiment of the present invention;
fig. 2 is a flowchart of a substep of step S100 of a method for evaluating reliability of positioning accuracy of a numerical control device according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating the substeps of step S300 of the method for evaluating reliability of positioning accuracy of a numerical control device according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating the substeps of step S330 of the method for evaluating reliability of positioning accuracy of a numerical control device according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a sub-step of step S350 of a method for evaluating reliability of positioning accuracy of a numerical control device according to an embodiment of the present invention;
fig. 6 is a flowchart of a sub-step of step S354 of the method for evaluating reliability of positioning accuracy of a numerical control device according to an embodiment of the present invention;
fig. 7 is a position error characteristic curve of the method for evaluating reliability of positioning accuracy of a numerical control device in the first hour according to the embodiment of the present invention;
fig. 8 is a position error characteristic curve of the method for evaluating reliability of positioning accuracy of a numerical control device in the first two hours according to the embodiment of the present invention;
fig. 9 is a position error characteristic curve of the method for evaluating the reliability of the positioning accuracy of the numerical control device in the second two hours according to the embodiment of the present invention;
fig. 10 is a position error characteristic curve of the method for evaluating the reliability of the positioning accuracy of the numerical control device in the third two hours according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Examples
The embodiment provides a positioning accuracy reliability evaluation method of numerical control equipment, and the method provided by the embodiment can improve the reliability of positioning accuracy evaluation.
The method comprises the following specific steps:
referring to fig. 1, in step S100, a position error of a movement axis of the numerical control device during a movement process within a preset stroke is measured.
In the embodiment, the position error of the motion axis of the numerical control device in the motion process within the preset stroke is measured, and the position error represents the deviation of the motion axis in the motion process.
The axis of motion may also be an axis of rotation.
In the embodiment, the position error of the motion axis of the numerical control equipment in the motion process in the preset stroke is measured at the preset temperature.
In the embodiment, the position error of the movement axis is measured at the preset temperature, so that the influence of the environmental factor on the measurement can be reduced, and the accuracy of the position error measurement is improved. Wherein the preset temperature is approximately 25 ℃.
Referring to fig. 2, step S100 includes step S110 and step S120.
In step S110, the laser interferometer detects the actual stroke of the movement axis in the movement process.
Wherein, the reflecting mirror of the laser interferometer moves along the movement axis, and the light path of the laser interferometer is parallel to the movement axis of the numerical control equipment; the axis of motion may also be a rotational axis. When the axis is a revolution axis, the axis of the rotary table of the laser interferometer coincides with the revolution axis.
In the embodiment, the laser interferometer is adopted to measure the position error of the movement axis in the movement process, so that the measurement precision of the position error can be improved.
In the process of evaluating the parallelism of the optical path and the motion axis of the laser interferometer, the Abbe error, the cosine error and the dead range error in the process of adjusting the optical path are reduced as much as possible, and the influence of airflow disturbance, local heat sources and the like in a test area is reduced.
Step S120, calculating a position error according to the actual stroke and the preset stroke.
In this embodiment, the preset stroke refers to a theoretical value of the stroke when the movement axis moves to the preset position, and the position error can be calculated according to the theoretical value and the actual stroke.
Referring to fig. 1, in step S200, a position error is collected every a predetermined time interval.
In the embodiment, in the process that the reflecting mirror of the laser interferometer moves along the movement axis, the position error is collected once at intervals of preset time, a plurality of position errors can be collected, the errors in the process of collecting the position errors can be reduced by the position errors, and the estimation precision of the positioning precision is improved.
And step S300, evaluating the positioning accuracy of the motion axis according to the plurality of position errors.
In the embodiment, the positioning accuracy is evaluated by analyzing the position errors, adjusting the geometric accuracy of the guide rail of the movement axis, improving the assembly process and other measures through unifying the assembly reference, and a specific adjustment mode can be selected according to the specific situation of the position errors, so that the reliability of the positioning accuracy evaluation is improved.
Referring to fig. 3, step S300 includes step S310, step S320, step S330, step S340 and step S350.
Step S310, the movement axis stays for an interval time after each movement interval distance in the movement process. Wherein the interval time is greater than the preset time.
In this embodiment, in the process of synchronous movement of the movement axis and the reflecting mirror of the laser interferometer, the movement axis stays for an interval time after each movement interval distance, and when the movement axis and the laser interferometer stay, a position error is still acquired every preset time.
In this embodiment, the interval time is longer than the preset time, and a plurality of position errors are collected in a section where the movement axis and the reflecting mirror of the laser interferometer stop moving at the same time. Typically, the predetermined time is 0.2s and the interval time is 1 s. I.e. 5 position errors are acquired while staying.
Step S320, the position error collected when the movement axis is stopped and the position information of the corresponding movement axis are screened out from the plurality of position errors.
In this embodiment, in order to facilitate the screening and analysis of a plurality of position errors, the motion axis and the laser interferometer may collect the position errors for a plurality of times during the stay, that is, a plurality of same position errors may occur. A plurality of identical position errors are screened out for analysis. And simultaneously recording the position information corresponding to the position error.
In step S330, the positioning accuracy of the movement axis is estimated according to the plurality of position errors with position information.
In this embodiment, the screened position errors have position information, and the position errors of the movement axis moving to different positions in the movement process can be analyzed according to the position errors with the position information.
Referring to fig. 4, step S330 may include step S332 and step S334.
In step S332, a position error characteristic curve is drawn according to the position information and the position error.
In the present embodiment, the position error with the position information is plotted as the position error characteristic curve, wherein the position information is the X-axis and the position error is the Y-axis.
Step 334, analyzing the positioning accuracy according to the position error characteristic curve, and evaluating and adjusting the positioning accuracy.
In this embodiment, the change of the position error at each position can be obtained according to the position error characteristic curve, the cause of the change is analyzed, and a specific adjustment method is formulated according to the position error of a specific position. Such as adjusting the accuracy of the guide of the axis of movement or improving the assembly process.
Referring to fig. 3, in step S340, time information of the numerical control device during one movement is recorded; the numerical control equipment reciprocates for a plurality of times within a preset stroke.
In this embodiment, when detecting the position error of the movement axis of the numerical control device, a plurality of tests are performed within the test time, and the accidental error of a single test is avoided.
In this embodiment, the test time may be divided into a plurality of test time periods, and one test time period is taken as one movement cycle, and in the test time period, the movement axis moves just once within the preset stroke. The motion axes correspond to the same time information in the same motion process.
In this embodiment, the maximum number of cycles of the laser interferometer is greater than the number of movements of the numerical control apparatus.
Step S350, estimating the positioning accuracy of the motion axis according to the time information and the plurality of position errors.
In the present embodiment, the position errors of the movement axis at different time periods are analyzed, and the position error change of the movement axis occurring with the gradual increase of the working time can be detected.
Referring to fig. 5, step S350 may include step S352 and step S354.
In step S352, a position error corresponding to the time information of the preset position is selected from the plurality of time information and the plurality of position errors.
In this embodiment, the position error corresponding to the corresponding time information at the preset position is screened out.
In step S354, the positioning accuracy of the movement axis is evaluated based on the position error with the time information.
In this embodiment, the change of the position error at the same position with time can be obtained according to the time error characteristic curve, the cause of the change is analyzed, and a specific adjustment method is formulated according to the position error at a specific position. Such as adjusting the accuracy of the guide of the axis of movement or improving the assembly process.
Referring to fig. 6, step S354 may include step S3542 and step S3544.
Step S3542, a time error characteristic curve at a preset position is drawn according to the time information and the position error.
In the present embodiment, a time error characteristic curve is plotted at a preset position, wherein the X-axis is time information and the Y-axis is a position error.
The predetermined position is generally any position within the predetermined stroke, and in the embodiment, the predetermined position is two end points of the predetermined stroke, for example, when the predetermined stroke is (0-720) mm, time error characteristic curves at 0mm and 720mm are plotted.
And S3544, analyzing the positioning accuracy according to the time error characteristic curve, evaluating and adjusting the positioning accuracy.
In this embodiment, the change of the position error at different times at the preset position can be obtained according to the time error characteristic curve, the reason of the change is analyzed, and a specific adjustment method is formulated according to the position error of the specific position. Such as adjusting the accuracy of the guide of the axis of movement or improving the assembly process.
In the present example, when the test time was 7 hours, 7 hours were divided into four periods of 1 hour, 2 hours, as shown in fig. 7 to 10, when the test time started from point 11 to point 18. Fig. 7 shows a position error characteristic curve from 11 points to 12 points in the first hour, fig. 8 shows a position error characteristic curve from 12 points to 14 points in the first 2 hours, fig. 9 shows a position error characteristic curve from 14 points to 16 points in the second 2 hours, and fig. 10 shows a position error characteristic curve from 16 points to 18 points in the third 2 hours. In fig. 7-10, the number of curve bars represents different time information.
The method can be obtained by analyzing a position error characteristic curve, the position error change of 0mm within 30 minutes after starting the machine is large, and the position error change is less than 3 micrometers within 6 hours later. By means of measures such as unifying assembly reference, adjusting geometric precision of the guide rail, improving assembly process and the like, the positioning precision of the numerical control equipment changes by less than 3 microns within 1 hour.
In summary, according to the method for evaluating the reliability of the positioning accuracy of the numerical control device provided by the embodiment, the reliability of the evaluation of the positioning accuracy can be improved by detecting the formation errors at different times and different positions.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A method for evaluating the reliability of the positioning accuracy of a numerical control device is characterized by comprising the following steps:
detecting the position error of the movement axis of the numerical control equipment in the movement process within a preset stroke;
collecting the position error once every preset time;
evaluating the positioning accuracy of the motion axis according to a plurality of the position errors;
the step of assessing the accuracy of the positioning of the axis of motion in terms of the plurality of position errors comprises:
in the movement process of the movement axis, stopping for an interval time after each movement interval distance, wherein the interval time is longer than the preset time;
screening out the position error and the position information of the corresponding movement axis, which are acquired when the movement axis stops, from the plurality of position errors;
evaluating the positioning accuracy of the movement axis from a plurality of the position errors with the position information.
2. The method according to claim 1, wherein the step of evaluating the positioning accuracy of the movement axis in accordance with the plurality of position errors having the position information includes:
drawing a position error characteristic curve according to the position information and the position error;
and analyzing the positioning precision according to the position error characteristic curve, and evaluating and adjusting the positioning precision.
3. The method for evaluating the reliability of the positioning accuracy of the numerical control device according to claim 1, further comprising:
the numerical control equipment reciprocates for multiple times within the preset stroke;
recording time information of the numerical control equipment during one-time movement;
and evaluating the positioning precision of the motion axis according to the time information and the position errors.
4. The method according to claim 3, wherein the step of estimating the positioning accuracy of the movement axis based on the plurality of time information and the plurality of position errors comprises:
screening the position error corresponding to a preset position in the time information from the time information and the position errors;
evaluating the positioning accuracy of the movement axis from the position error with time information.
5. The method according to claim 4, wherein the step of evaluating the positioning accuracy of the movement axis from the position error with time information comprises:
drawing a time error characteristic curve at the preset position according to the time information and the position error;
and analyzing the positioning precision according to the time error characteristic curve, and evaluating and adjusting the positioning precision.
6. The method according to claim 5, wherein the predetermined positions are plural, and the step of evaluating the positioning accuracy of the movement axis based on the position error with time information further comprises:
and analyzing the positioning accuracy according to a plurality of time error characteristic curves, and evaluating and adjusting the positioning accuracy.
7. The method for evaluating the reliability of the positioning accuracy of the numerical control device according to claim 1, wherein the method for evaluating the reliability of the positioning accuracy of the numerical control device comprises:
and detecting the position error of the movement axis of the numerical control equipment in the movement process in the preset stroke at a preset temperature.
8. The method for evaluating the reliability of the positioning accuracy of the numerical control device according to claim 1, wherein the step of detecting the position error of the movement axis of the numerical control device during the movement comprises:
the laser interferometer detects the actual stroke of the motion axis in the motion process; the reflecting mirror of the laser interferometer moves along the movement axis, and the optical path of the laser interferometer is parallel to the movement axis of the numerical control equipment;
and calculating the position error according to the actual stroke and the preset stroke.
9. The method as claimed in claim 8, wherein the maximum number of cycles of the laser interferometer is greater than the number of movements of the numerical control device.
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