CN111745463A - Error compensation planning method and system based on-line measurement front file - Google Patents
Error compensation planning method and system based on-line measurement front file Download PDFInfo
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- CN111745463A CN111745463A CN202010609334.4A CN202010609334A CN111745463A CN 111745463 A CN111745463 A CN 111745463A CN 202010609334 A CN202010609334 A CN 202010609334A CN 111745463 A CN111745463 A CN 111745463A
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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
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/20—Automatic control or regulation of feed movement, cutting velocity or position of tool or work before or after the tool acts upon the workpiece
- B23Q15/22—Control or regulation of position of tool or workpiece
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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 an error compensation planning method and system based on an on-line measurement front file. The invention outputs the on-machine measurement plan in the form of the preposed file, avoids the problem that the program is not matched with the machine tool due to different types of numerical control machines, and improves the universality and the flexibility. And according to the positioning error compensation value before the part is machined and the error compensation value in the part machining process, compensation planning is carried out on the positioning error or machining of the part, and on the premise of ensuring the measurement precision, the machine tool is controlled by a numerical control program to carry out measurement and compensation machining, so that the manual participation is reduced, and the machining and measurement efficiency of the numerical control machine tool is improved.
Description
Technical Field
The invention relates to the field of part processing compensation, in particular to an error compensation planning method and system based on an on-machine measurement front file.
Background
The complex parts have the characteristics of multiple processing procedures, long manufacturing period, high precision requirement and the like. In order to ensure the processing quality of the complex parts, the parts are measured on machine after part of key processing procedures are finished, and whether error compensation processing is needed or not is determined according to the result of the measurement on machine, so that the processing quality of the complex parts is improved to a certain extent. However, in order to implement compensation processing, the measurement result at the machine tool is usually extracted from the machine tool, and then calculation, comparison and analysis are performed externally, and then corresponding compensation measures are determined, and the machine tool processing parameters are adjusted to perform error compensation processing. The method reduces the whole machining efficiency of the part and influences the manufacturing period.
Therefore, it is an urgent technical problem to provide a method for performing error compensation planning on a machine tool machining part by online measurement and evaluation, which can improve the machining efficiency of the part.
Disclosure of Invention
The invention aims to provide an error compensation planning method and system based on an on-line measurement front file, which realize on-line measurement and evaluation, plan error compensation and improve processing efficiency.
In order to achieve the purpose, the invention provides the following scheme:
an error compensation planning method based on an on-line measurement preamble file, the method comprising:
constructing an on-line measurement front file for describing an on-line measurement inspection planning model; the on-machine measurement front file comprises: the method comprises the following steps of (1) obtaining part names, machining work sequence numbers, evaluation results, upper deviations, lower deviations, theoretical values and measuring point information; the station information includes: the measured coordinates of the measuring points and the theoretical coordinates of the measuring points;
calculating a positioning error compensation value before part machining by adopting a measuring point calculation mode according to the measuring point information in the on-machine measurement front file;
compensating by adopting a first compensation mode according to the positioning error compensation value before the part machining, wherein the first compensation mode comprises coordinate system alignment and coordinate system straightening;
obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and compensating by adopting a second compensation mode according to the error compensation value in the part machining process, wherein the second compensation mode is one or more of cutter radius compensation, cutter length compensation and coordinate system compensation.
Optionally, the calculating, according to the measured point information in the on-machine measurement pre-file, a positioning error compensation value before the part processing in a measured point calculation manner includes:
when the placement positions of the parts are corrected, two measuring points of which the theoretical coordinates are symmetrical about an original point are selected as a first preset measuring point and a second preset measuring point;
according to the actual measurement coordinates of the first preset measurement point and the second preset measurement point, a formula CDZ is utilizedi＝(POINT[ei]+POINT[fi]) Determining a first positioning error compensation value CDZ before machining the parti(ii) a Wherein, CDZiFor the first positioning error compensation value, POINT [ e ], before machining partsi]Is the coordinate of the i coordinate axis of the first preset measuring POINT, POINT [ f [ ]i]The coordinate of the coordinate axis i of the second preset measuring point is represented, and i is x, y or z;
when a rotating shaft of the numerical control machine tool is calibrated, two measuring points with the same z coordinate of a theoretical coordinate are selected as a third preset measuring point and a fourth preset measuring point;
according to the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point, a formula CDZ is utilizedj＝arctan((POINT*[mz]-POINT*[nz])/POINT*[mj]-POINT*[nj]) Determining a second positioning error compensation value CDZ before machining the partj(ii) a Wherein, CDZjFor a second compensation value of the positioning error, POINT m, before machining the partz]For a third predetermined measuring pointZ-coordinate, POINT m, of measured coordinatesj]J coordinate of measured coordinate of third preset measuring POINT, j ═ x or y, POINT [ n [ ]z]For the measured z-coordinate, POINT n, of the fourth predetermined measurement POINTj]And j is the j coordinate of the measured coordinate of the fourth preset measuring point, and j is x or y.
Optionally, the compensating by using a first compensation method according to the positioning error compensation value before the part processing further includes:
judging whether the positioning error compensation value before the part is machined is 0 or not to obtain a first judgment result;
if the first judgment result shows that the difference value is greater than the first judgment result, executing the step of obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and if the first judgment result shows no, executing the step of adopting a first compensation mode to compensate according to the positioning error compensation value before the part machining.
Optionally, the compensating by using a first compensation method according to the positioning error compensation value before the part processing specifically includes:
when the placing position of the part is corrected, the first compensation mode is coordinate system alignment, and according to the first positioning error compensation value before part machining, the error compensation scheme before part machining is determined to be that the coordinate system moves along the i axis-CDZiA value;
when the rotating shaft of the numerical control machine tool is calibrated, the first compensation mode is that the coordinate system is straightened, and according to the second positioning error compensation value before the part is machined, the error compensation scheme before the part is machined is determined to be that the coordinate system rotates around the j axis-CDZjA value.
Optionally, the compensating by using a second compensation method according to the error compensation value in the part machining process further includes:
judging whether the error compensation value in the part machining process is greater than or equal to the lower deviation and less than or equal to the upper deviation or not to obtain a second judgment result;
if the second judgment result shows that the part is qualified, the part is processed;
and if the second judgment result shows no, executing the step of compensating by adopting a second compensation mode according to the error compensation value in the part machining process.
Optionally, the compensating by using a second compensation method according to the error compensation value in the part processing process specifically includes:
when the type of the part processing part corresponding to the processing work sequence number is a hole axis, the second compensation mode is cutter radius compensation, and according to the error compensation value in the part processing process, the error compensation scheme in the part processing process is determined to be compensation processing in which the compensation value of the cutter radius is the absolute value of the error compensation value in the part processing process in the next part processing process;
when the type of the part processing part corresponding to the processing tool number is a plane, the second compensation mode is cutter radius compensation or cutter length compensation, and according to the error compensation value in the part processing process, the error compensation scheme in the part processing process is determined to be compensation processing in which the compensation value of the cutter radius or the cutter length in the next part processing process is the absolute value of the error compensation value in the part processing process;
when the types of the parts to be machined corresponding to the machining work sequence numbers are symmetrical, the second compensation mode is coordinate system compensation, whether an error compensation value in the part machining process is positive or not is judged, and a third judgment result is obtained;
if the third judgment result shows that the error compensation value in the part machining process is positive, the error compensation scheme in the part machining process is to move the coordinate system of the numerical control machine tool to the positive direction by the error compensation value in the part machining process;
and if the third judgment result shows that the error compensation value in the part machining process is not positive, the error compensation scheme in the part machining process is to move the coordinate system of the numerical control machine tool to the negative direction to obtain the absolute value of the error compensation value in the part machining process.
An error compensation planning system based on an on-machine measurement preamble, the system comprising:
the on-line measurement front file construction unit is used for constructing an on-line measurement front file for describing an on-line measurement inspection planning model; the on-machine measurement front file comprises: the method comprises the following steps of (1) obtaining part names, machining work sequence numbers, evaluation results, upper deviations, lower deviations, theoretical values and measuring point information; the station information includes: the measured coordinates of the measuring points and the theoretical coordinates of the measuring points;
the positioning error compensation value acquisition unit before part machining is used for calculating a positioning error compensation value before part machining by adopting a measuring point calculation mode according to the measuring point information in the on-machine measurement front file;
the first compensation mode determining unit is used for compensating by adopting a first compensation mode according to the positioning error compensation value before the part is machined, and the first compensation mode comprises coordinate system alignment and coordinate system straightening;
the error compensation value acquisition unit is used for acquiring an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and the second compensation mode determining unit is used for compensating by adopting a second compensation mode according to the error compensation value in the part machining process, wherein the second compensation mode is one or more of cutter radius compensation, cutter length compensation and coordinate system compensation.
Optionally, the unit for obtaining a positioning error compensation value before machining the part specifically includes:
the part placing position preset measuring point obtaining subunit is used for selecting two measuring points of which the theoretical coordinates are symmetrical about an original point as a first preset measuring point and a second preset measuring point when the part placing position is corrected;
a first positioning error compensation value obtaining subunit used for obtaining the actual measurement coordinates of the first preset measurement point and the second preset measurement point by using a formula CDZ before the part is machinedi＝(POINT[ei]+POINT[fi]) Determining a first positioning error compensation value CDZ before machining the parti(ii) a Wherein, CDZiFor the first positioning error compensation value, POINT [ e ], before machining partsi]Is the coordinate of the i coordinate axis of the first preset measuring POINT, POINT [ f [ ]i]The coordinate of the coordinate axis i of the second preset measuring point is represented, and i is x, y or z;
the numerical control machine tool rotating shaft preset measuring point obtaining subunit is used for selecting two measuring points with the same z coordinate of a theoretical coordinate as a third preset measuring point and a fourth preset measuring point when the numerical control machine tool rotating shaft is calibrated;
a second positioning error compensation value obtaining subunit used for obtaining the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point by using a formula CDZ according to the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point before the part is machinedj＝arctan((POINT*[mz]-POINT*[nz])/POINT*[mj]-POINT*[nj]) Determining a second positioning error compensation value CDZ before machining the partj(ii) a Wherein, CDZjFor a second compensation value of the positioning error, POINT m, before machining the partz]Is the z coordinate, POINT m coordinate, of the measured coordinate of the third predetermined measuring POINTj]J coordinate of measured coordinate of third preset measuring POINT, j ═ x or y, POINT [ n [ ]z]For the measured z-coordinate, POINT n, of the fourth predetermined measurement POINTj]And j is the j coordinate of the measured coordinate of the fourth preset measuring point, and j is x or y.
Optionally, the first compensation mode determining unit specifically includes:
a part placement position error compensation scheme determining subunit, configured to perform calibration on the placement position of the part, where the first compensation mode is coordinate system alignment, and according to the first positioning error compensation value before part processing, determine an error compensation scheme before part processing that is to move the coordinate system along the i axis — CDZiA value;
the determining subunit of the error compensation scheme of the rotating shaft of the numerical control machine tool is used for calibrating the rotating shaft of the numerical control machine tool, the first compensation mode is the straightening of a coordinate system, and the determining subunit determines the position of the part before machining according to the second positioning error compensation value before machining the partThe error compensation scheme of (2) is to rotate the coordinate system around the j axis-CDZjA value.
Optionally, the second compensation mode determining unit specifically includes:
a hole axis error compensation scheme determining subunit, configured to, when the type of the part processing location corresponding to the processing tool number is a hole axis, determine that the second compensation mode is tool radius compensation, and according to an error compensation value in the part processing process, determine that the error compensation scheme in the part processing process is compensation processing in which a compensation value for a tool radius is an absolute value of the error compensation value in the part processing process in a next part processing process;
a plane error compensation scheme determining subunit, configured to, when the type of the part processing location corresponding to the processing tool number is a plane, determine that the second compensation mode is tool radius compensation or tool length compensation, and according to an error compensation value in the part processing process, determine that the error compensation scheme in the part processing process is compensation processing in which a compensation value for a tool radius or a tool length is an absolute value of the error compensation value in the part processing process in a next part processing process;
a third judgment result obtaining subunit, configured to, when the types of the parts to be machined corresponding to the machining process number are symmetric, judge whether an error compensation value in the part machining process is positive, where the second compensation mode is coordinate system compensation, and obtain a third judgment result;
a first symmetric error compensation scheme determining subunit, configured to, if the third determination result indicates that the error compensation value in the part processing process is positive, move the coordinate system of the numerical control machine tool to the positive direction by the error compensation value in the part processing process according to the error compensation scheme in the part processing process;
and the second symmetric error compensation scheme determining subunit is configured to, if the third determination result indicates that the error compensation value in the part processing process is not positive, move the coordinate system of the numerical control machine tool in the negative direction by the absolute value of the error compensation value in the part processing process.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the error compensation planning method based on the on-machine measurement front file, the on-machine measurement planning is output in the form of the front file, the problem that programs are not matched with a machine tool due to different types of numerical control machines is solved, and the universality and the flexibility are improved. And according to the positioning error compensation value before the part is machined and the error compensation value in the part machining process, compensation planning is carried out on the positioning error or machining of the part, and on the premise of ensuring the measurement precision, the machine tool is controlled by a numerical control program to carry out measurement and compensation machining, so that the manual participation is reduced, and the machining and measurement efficiency of the numerical control machine tool is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of an error compensation planning method based on an on-line measurement preamble file according to the present invention;
FIG. 2 is a block diagram of an on-machine measurement preamble provided by the present invention;
FIG. 3 is a schematic diagram of an error compensation planning method based on an on-line measurement preamble file according to the present invention;
FIG. 4 is a schematic diagram of tool compensation provided by the present invention; FIG. 4(a) is a machining diagram before tool compensation; FIG. 4(b) is a machining diagram after tool compensation;
FIG. 5 is a schematic diagram of coordinate system compensation provided by the present invention; FIG. 5(a) is a processing diagram before coordinate system compensation; FIG. 5(b) is a processing diagram after coordinate system compensation;
FIG. 6 is a block diagram of an error compensation planning system based on an on-line measurement preamble provided by the present invention;
description of the symbols: 1-on-machine measurement pre-file construction unit, 2-positioning error compensation value acquisition unit before part processing, 3-first compensation mode determination unit, 4-error compensation value acquisition unit in part processing process, and 5-second compensation mode determination unit.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The invention aims to provide an error compensation planning method and system based on an on-line measurement front file, which realize on-line measurement and evaluation, plan error compensation and improve processing efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of an error compensation planning method based on an on-line measurement preamble file according to the present invention. As shown in fig. 1, an error compensation planning method based on-machine measurement of a preamble file includes the following steps:
s1, constructing an on-line measurement front file for describing the on-line measurement inspection planning model; as shown in fig. 2, the on-machine measurement preamble file includes: the method comprises the following steps of (1) obtaining part names, machining work sequence numbers, evaluation results, upper deviations, lower deviations, theoretical values and measuring point information; the measuring point information comprises: the measured coordinates of the measuring points and the theoretical coordinates of the measuring points.
The specific method for acquiring the data in the on-machine measurement front file comprises the following steps:
(1) reading on-machine measurement inspection planning parameter information
The method comprises the steps of acquiring child nodes of an on-line measurement inspection planning model by using a CATIDescriptant interface of CATIA, acquiring an attribute 'StepType' of the nodes by using a CATISEPACTrAccess interface of CATIA, acquiring the nodes with the name of 'on-line parameter item', and writing the nodes into a pre-file by acquiring the attributes 'BackUp 1' and 'BackUp 3' of the nodes as information of part names and work sequence numbers.
(2) Reading on-line measurement inspection planning path information
And acquiring child nodes of the on-machine measurement inspection planning model by using a CATIDescrendant interface of the CATIA, and acquiring the attribute 'StepType' of the nodes through a CATISPECCATTrACCESS interface of the CATIA. Wherein the node named as the online measuring point project is a measuring path node. The method comprises the steps of obtaining attributes 'stepName', 'x', 'y', 'z', 'i', 'j' and 'k' of a measurement path node as measurement point information, wherein the 'stepName' is a characteristic of measurement of a measurement point and comprises a plane, a cylinder, a measurement point and the like, and Type information is stored in a Type variable of a front file; x, y and z are coordinates of the measuring points, and i, j and k are directions of the measuring points. The POINT information is stored in Point [ ], wherein Point [0], Point [1], Point [2] represent the X, Y, Z coordinates of the first POINT, and so on.
(3) Reading on-line measurement inspection plan evaluation information
The method comprises the steps of acquiring child nodes of an on-line measurement inspection planning model by using a CATIDescrendant interface of CATIA, and acquiring an attribute 'StepType' of the nodes by using a CATISEPACTrAccess interface of CATIA, wherein the nodes named as 'on-line evaluation items' are evaluation nodes. And writing the attributes 'NormalValue', 'UpValue', 'LowValue' and 'APT' of the node into the front file as information of theoretical values, upper and lower deviations and evaluation results.
And S2, calculating a positioning error compensation value before the part is machined by adopting a measuring point calculation mode according to the measuring point information in the on-machine measurement front file.
Step S2, specifically including:
when the placement positions of the parts are corrected, two measuring points of which the theoretical coordinates are symmetrical about an original point are selected as a first preset measuring point and a second preset measuring point;
according to the first preset measuring point and the second preset measuring pointSetting the measured coordinates of the measuring points, using the formula CDZi＝(POINT[ei]+POINT[fi]) Determining a first positioning error compensation value CDZ before machining the parti(ii) a Wherein, CDZiFor the first positioning error compensation value, POINT [ e ], before machining partsi]Is the coordinate of the i coordinate axis of the first preset measuring POINT, POINT [ f [ ]i]The coordinate of the coordinate axis i of the second preset measuring point is represented, and i is x, y or z;
when a rotating shaft of the numerical control machine tool is calibrated, two measuring points with the same z coordinate of a theoretical coordinate are selected as a third preset measuring point and a fourth preset measuring point;
according to the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point, a formula CDZ is utilizedj＝arctan((POINT*[mz]-POINT*[nz])/POINT*[mj]-POINT*[nj]) Determining a second positioning error compensation value CDZ before machining the partj(ii) a Wherein, CDZjFor a second compensation value of the positioning error, POINT m, before machining the partz]Is the z coordinate, POINT m coordinate, of the measured coordinate of the third predetermined measuring POINTj]J coordinate of measured coordinate of third preset measuring POINT, j ═ x or y, POINT [ n [ ]z]For the measured z-coordinate, POINT n, of the fourth predetermined measurement POINTj]And j is the j coordinate of the measured coordinate of the fourth preset measuring point, and j is x or y.
And S3, compensating by adopting a first compensation mode according to the positioning error compensation value before the part machining, wherein the first compensation mode comprises coordinate system alignment and coordinate system straightening.
Step S3, which includes:
judging whether the positioning error compensation value before the part is machined is 0 or not to obtain a first judgment result;
if the first judgment result shows that the first judgment result is positive, executing the step of obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and if the first judgment result shows no, executing the step of adopting a first compensation mode to compensate according to the positioning error compensation value before the part machining.
Step S3, specifically including:
when the placing position of the part is corrected, the first compensation mode is coordinate system alignment, and according to the first positioning error compensation value before part machining, the error compensation scheme before part machining is determined to be that the coordinate system moves along the i axis-CDZiA value; wherein i ═ x, y, or z;
when the rotating shaft of the numerical control machine tool is calibrated, the first compensation mode is that the coordinate system is straightened, and according to the second positioning error compensation value before the part is machined, the error compensation scheme before the part is machined is determined to be that the coordinate system rotates around the j axis-CDZjA value. When j is x, the numerical control machine turntable rotates around the x axis, and then the coordinate system rotates around the x axis-CDZxThe value is compensated for the A axis of the numerical control machine; when j is equal to y, the numerical control machine turntable rotates around the y axis, and then the coordinate system rotates around the y axis to be CDZyThe value, namely the B axis of the numerical control machine tool is compensated.
And S4, obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file. The method specifically comprises the following steps:
and the evaluation information is oriented to tolerance marking of the part model and is used for compensating errors in the machining process. And storing the calculation result in the evaluation information into a variable AVALUE, storing a theoretical value into a DVALUE, storing the UPPER deviation and the LOWER deviation into an UPPER and a LOWER respectively, and calculating the difference between the calculation value and the theoretical value and storing a variable CDZ which is AVALUE-DVALUE.
Step S4, which includes:
judging whether the error compensation value in the part machining process is greater than or equal to the lower deviation and less than or equal to the upper deviation or not to obtain a second judgment result;
if the second judgment result shows that the part is qualified, the part is processed;
and if the second judgment result shows no, executing the step of adopting a second compensation mode to compensate according to the error compensation value in the part machining process.
And S5, compensating by adopting a second compensation mode according to the error compensation value in the part machining process, wherein the second compensation mode is one or more of cutter radius compensation, cutter length compensation and coordinate system compensation.
The tool radius compensation and the tool length compensation are essentially to compensate for errors by changing the distance from the tool to the cutting surface, as shown in fig. 4, the first time of machining part in fig. 4(a) is not in place, and the compensation value is D by evaluating the information, so the second time of machining process makes the part qualified by performing compensation machining on the tool with the compensation value D, as shown in fig. 4(b), the tool radius is R. The compensation processing of the hole axis is usually performed by tool radius compensation, and the compensation can be performed by tool radius or tool length for plane processing corresponding to dimensions such as a point-to-point distance and a surface-to-surface distance.
As shown in fig. 5, the distance d from the Y axis theoretically required for processing two surfaces in fig. 5(a), and the left side is processed excessively and the right side is not processed completely in the processing process. If the left machining compensation amount and the right machining compensation amount obtained from the evaluation information are d1-d and d2-d, respectively, the coordinate system movement distance x is (d2-d1)/2, and if x >0, the coordinate system moves in the positive direction, and if x <0, the coordinate system moves in the negative direction. Coordinate system compensation schemes may be used for machining errors for symmetric dimensional tolerances or symmetry tolerances in parts.
Step S5, specifically including:
when the type of the part processing part corresponding to the processing work sequence number is a hole axis, a second compensation mode is cutter radius compensation, and according to an error compensation value in the part processing process, an error compensation scheme in the part processing process is determined, namely compensation processing is carried out on the cutter radius in the next part processing process, wherein the compensation value is an absolute value of the error compensation value in the part processing process;
when the type of the part processing part corresponding to the processing work sequence number is a plane, the second compensation mode is cutter radius compensation or cutter length compensation, and according to an error compensation value in the part processing process, the error compensation scheme in the part processing process is determined to be compensation processing in which the compensation value of the cutter radius or the cutter length in the next part processing process is an absolute value of the error compensation value in the part processing process;
when the types of the parts to be machined corresponding to the machining work sequence numbers are symmetrical, the second compensation mode is coordinate system compensation, whether an error compensation value in the part machining process is positive or not is judged, and a third judgment result is obtained;
if the third judgment result shows that the error compensation value in the part machining process is positive, the error compensation scheme in the part machining process is to move the coordinate system of the numerical control machine tool to the positive direction;
and if the third judgment result shows that the error compensation value in the part machining process is not positive, the error compensation scheme in the part machining process is to move the coordinate system of the numerical control machine tool to the negative direction to move the absolute value of the error compensation value in the part machining process.
The principle of the error compensation planning method based on the on-line measurement of the preamble file provided by the invention is shown in fig. 3.
The method outputs the planning of on-machine measurement in the form of the preposed file, avoids the problem that the program is not matched with the machine tool due to different types of numerical control machines, and improves the universality and the flexibility. The compensation planning is carried out on the processing or positioning error of the part by combining the principle of relevant error compensation, the machine tool is controlled by a numerical control program to carry out measurement and compensation processing on the premise of ensuring the measurement precision, the manual participation degree is reduced, the processing and measurement efficiency of the numerical control machine tool is improved, and the working mode of processing, measurement, compensation processing and re-measurement is gradually realized.
The invention also provides an error compensation planning system based on the on-line measurement front file, which comprises: the device comprises a machine measurement preposed file constructing unit 1, a positioning error compensation value acquiring unit 2 before part machining, a first compensation mode determining unit 3, an error compensation value acquiring unit 4 in the part machining process and a second compensation mode determining unit 5.
An on-line measurement front file constructing unit 1 for constructing an on-line measurement front file for describing an on-line measurement inspection planning model; the on-machine measurement front file comprises: the method comprises the following steps of (1) obtaining part names, machining work sequence numbers, evaluation results, upper deviations, lower deviations, theoretical values and measuring point information; the measuring point information comprises: the measured coordinates of the measuring points and the theoretical coordinates of the measuring points;
the positioning error compensation value obtaining unit 2 is used for calculating a positioning error compensation value before the part machining by adopting a measuring point calculation mode according to measuring point information in an on-machine measurement front file;
the first compensation mode determining unit 3 is used for compensating by adopting a first compensation mode according to a positioning error compensation value before part machining, wherein the first compensation mode comprises coordinate system alignment and coordinate system straightening;
the error compensation value acquisition unit 4 is used for acquiring an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and the second compensation mode determining unit 5 is used for compensating by adopting a second compensation mode according to the error compensation value in the part machining process, wherein the second compensation mode is one or more of cutter radius compensation, cutter length compensation and coordinate system compensation.
The unit 2 for obtaining the positioning error compensation value before the part processing specifically includes: the device comprises a part placing position preset measuring point obtaining subunit, a first positioning error compensation value obtaining subunit before part machining, a numerical control machine rotation axis preset measuring point obtaining subunit and a second positioning error compensation value obtaining subunit before part machining.
The part placing position preset measuring point obtaining subunit is used for selecting two measuring points of which the theoretical coordinates are symmetrical about an original point as a first preset measuring point and a second preset measuring point when the part placing position is corrected;
a first positioning error compensation value obtaining subunit used for obtaining the actual measurement coordinates of the first preset measurement point and the second preset measurement point according to the formula CDZ before the part is processedi＝(POINT[ei]+POINT[fi]) Determining a first positioning error compensation value CDZ before machining the parti(ii) a Wherein, CDZiFor the first positioning error compensation value, POINT [ e ], before machining partsi]I coordinate of the first preset measuring pointCoordinate of axis, POINT [ f ]i]The coordinate of the coordinate axis i of the second preset measuring point is represented, and i is x, y or z;
the numerical control machine tool rotating shaft preset measuring point obtaining subunit is used for selecting two measuring points with the same z coordinate of a theoretical coordinate as a third preset measuring point and a fourth preset measuring point when the numerical control machine tool rotating shaft is calibrated;
a second positioning error compensation value obtaining subunit used for obtaining the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point by using a formula CDZ according to the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point before the part is machinedj＝arctan((POINT*[mz]-POINT*[nz])/POINT*[mj]-POINT*[nj]) Determining a second positioning error compensation value CDZ before machining the partj(ii) a Wherein, CDZjFor a second compensation value of the positioning error, POINT m, before machining the partz]Is the z coordinate, POINT m coordinate, of the measured coordinate of the third predetermined measuring POINTj]J coordinate of measured coordinate of third preset measuring POINT, j ═ x or y, POINT [ n [ ]z]For the measured z-coordinate, POINT n, of the fourth predetermined measurement POINTj]And j is the j coordinate of the measured coordinate of the fourth preset measuring point, and j is x or y.
The first compensation mode determining unit 3 specifically includes: a part placing position error compensation scheme determining subunit and a numerical control machine tool rotating shaft error compensation scheme determining subunit.
A part placement position error compensation scheme determining subunit, configured to perform calibration on the placement position of the part, where the first compensation mode is coordinate system alignment, and according to the first positioning error compensation value before part processing, determine an error compensation scheme before part processing, that is, move the coordinate system along the i-axis — CDZiA value;
the error compensation scheme determining subunit is used for correcting the rotating shaft of the numerical control machine tool, the first compensation mode is that the coordinate system is straightened, and according to the second positioning error compensation value before part machining, the error compensation scheme before part machining is determined to be that the coordinate system rotates around the j axis-CDZjA value.
The second compensation mode determining unit specifically includes: the device comprises a hole axis error compensation scheme determining subunit, a plane error compensation scheme determining subunit, a third judgment result obtaining subunit, a first symmetric error compensation scheme determining subunit and a second symmetric error compensation scheme determining subunit.
The hole axis error compensation scheme determining subunit is used for determining the error compensation scheme in the part processing process as compensation processing of the compensation value of the tool radius in the next part processing process as the absolute value of the error compensation value in the part processing process according to the error compensation value in the part processing process, wherein the second compensation mode is tool radius compensation when the type of the part processing part corresponding to the processing work order number is the hole axis;
the plane error compensation scheme determining subunit is used for determining the error compensation scheme in the part processing process as compensation processing of which the compensation value is the absolute value of the error compensation value in the part processing process in the next part processing process according to the error compensation value in the part processing process, wherein the second compensation mode is cutter radius compensation or cutter length compensation when the type of the part processing part corresponding to the processing work number is a plane;
a third judgment result obtaining subunit, configured to, when the types of the parts to be machined corresponding to the machining process number are symmetric, determine whether an error compensation value in the part machining process is positive by using the second compensation mode of coordinate system compensation, and obtain a third judgment result;
the first symmetric error compensation scheme determining subunit is used for determining that the error compensation scheme in the part machining process is the error compensation value in the part machining process by moving the coordinate system of the numerical control machine tool to the positive direction if the third judgment result indicates that the error compensation value in the part machining process is positive;
and the second symmetric error compensation scheme determining subunit is used for determining that the error compensation scheme in the part machining process is the absolute value of the error compensation value in the part machining process by moving the coordinate system of the numerical control machine tool to the negative direction if the third judgment result shows that the error compensation value in the part machining process is not positive.
The invention provides an error compensation planning system based on an on-line measurement front file, which further comprises: the device comprises a first judgment result unit, a first execution step unit and a second execution step unit.
And the first judgment result unit is used for judging whether the positioning error compensation value before the part is machined is 0 or not to obtain a first judgment result.
And the first execution step unit is used for executing the step of obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file if the first judgment result indicates yes.
And a second executing step unit, configured to execute the step "compensate by using the first compensation method according to the positioning error compensation value before the part machining" if the first determination result indicates no.
The system further comprises: the device comprises a second judgment result unit, a part machining qualification determining unit and a third execution step unit.
And the second judgment result unit is used for judging whether the error compensation value in the part machining process is greater than or equal to the lower deviation and less than or equal to the upper deviation or not to obtain a second judgment result.
And the part machining qualification determining unit is used for indicating that the part is qualified when the second judgment result indicates that the part is qualified.
And a third executing step unit, configured to execute the step "compensate by using a second compensation method according to the error compensation value in the part machining process" if the second determination result indicates no.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An error compensation planning method based on an on-machine measurement preamble file is characterized by comprising the following steps:
constructing an on-line measurement front file for describing an on-line measurement inspection planning model; the on-machine measurement front file comprises: the method comprises the following steps of (1) obtaining part names, machining work sequence numbers, evaluation results, upper deviations, lower deviations, theoretical values and measuring point information; the station information includes: the measured coordinates of the measuring points and the theoretical coordinates of the measuring points;
calculating a positioning error compensation value before part machining by adopting a measuring point calculation mode according to the measuring point information in the on-machine measurement front file;
compensating by adopting a first compensation mode according to the positioning error compensation value before the part machining, wherein the first compensation mode comprises coordinate system alignment and coordinate system straightening;
obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and compensating by adopting a second compensation mode according to the error compensation value in the part machining process, wherein the second compensation mode is one or more of cutter radius compensation, cutter length compensation and coordinate system compensation.
2. The method for planning error compensation based on the on-machine measurement profile according to claim 1, wherein the calculating a positioning error compensation value before the part processing by using the measurement point calculation method according to the measurement point information in the on-machine measurement profile specifically comprises:
when the placement positions of the parts are corrected, two measuring points of which the theoretical coordinates are symmetrical about an original point are selected as a first preset measuring point and a second preset measuring point;
according to the first preset measuring point andthe actual measurement coordinates of the second preset measurement point utilize a formula CDZi＝(POINT[ei]+POINT[fi]) Determining a first positioning error compensation value CDZ before machining the parti(ii) a Wherein, CDZiFor the first positioning error compensation value, POINT [ e ], before machining partsi]Is the coordinate of the i coordinate axis of the first preset measuring POINT, POINT [ f [ ]i]The coordinate of the coordinate axis i of the second preset measuring point is represented, and i is x, y or z;
when a rotating shaft of the numerical control machine tool is calibrated, two measuring points with the same z coordinate of a theoretical coordinate are selected as a third preset measuring point and a fourth preset measuring point;
according to the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point, a formula CDZ is utilizedj＝arctan((POINT*[mz]-POINT*[nz])/POINT*[mj]-POINT*[nj]) Determining a second positioning error compensation value CDZ before machining the partj(ii) a Wherein, CDZjFor a second compensation value of the positioning error, POINT m, before machining the partz]Is the z coordinate, POINT m coordinate, of the measured coordinate of the third predetermined measuring POINTj]J coordinate of measured coordinate of third preset measuring POINT, j ═ x or y, POINT [ n [ ]z]For the measured z-coordinate, POINT n, of the fourth predetermined measurement POINTj]And j is the j coordinate of the measured coordinate of the fourth preset measuring point, and j is x or y.
3. The method for planning error compensation based on-machine measurement front file according to claim 1, wherein the compensation is performed by a first compensation method according to the positioning error compensation value before the part machining, and the method further comprises:
judging whether the positioning error compensation value before the part is machined is 0 or not to obtain a first judgment result;
if the first judgment result shows that the difference value is greater than the first judgment result, executing the step of obtaining an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and if the first judgment result shows no, executing the step of adopting a first compensation mode to compensate according to the positioning error compensation value before the part machining.
4. The method for planning error compensation based on the on-machine measurement profile according to claim 2, wherein the compensating according to the positioning error compensation value before the part machining by a first compensation method specifically comprises:
when the placing position of the part is corrected, the first compensation mode is coordinate system alignment, and according to the first positioning error compensation value before part machining, the error compensation scheme before part machining is determined to be that the coordinate system moves along the i axis-CDZiA value;
when the rotating shaft of the numerical control machine tool is calibrated, the first compensation mode is that the coordinate system is straightened, and according to the second positioning error compensation value before the part is machined, the error compensation scheme before the part is machined is determined to be that the coordinate system rotates around the j axis-CDZjA value.
5. The method for planning error compensation based on-machine measurement front file according to claim 1, wherein the compensation is performed by a second compensation method according to the error compensation value in the part machining process, and the method further comprises the following steps:
judging whether the error compensation value in the part machining process is greater than or equal to the lower deviation and less than or equal to the upper deviation or not to obtain a second judgment result;
if the second judgment result shows that the part is qualified, the part is processed;
and if the second judgment result shows no, executing the step of compensating by adopting a second compensation mode according to the error compensation value in the part machining process.
6. The method for planning error compensation based on the on-machine measurement profile according to claim 1, wherein the compensating according to the error compensation value in the machining process of the part by using a second compensation method specifically comprises:
when the type of the part processing part corresponding to the processing work sequence number is a hole axis, the second compensation mode is cutter radius compensation, and according to the error compensation value in the part processing process, the error compensation scheme in the part processing process is determined to be compensation processing in which the compensation value of the cutter radius is the absolute value of the error compensation value in the part processing process in the next part processing process;
when the type of the part processing part corresponding to the processing tool number is a plane, the second compensation mode is cutter radius compensation or cutter length compensation, and according to the error compensation value in the part processing process, the error compensation scheme in the part processing process is determined to be compensation processing in which the compensation value of the cutter radius or the cutter length in the next part processing process is the absolute value of the error compensation value in the part processing process;
when the types of the parts to be machined corresponding to the machining work sequence numbers are symmetrical, the second compensation mode is coordinate system compensation, whether an error compensation value in the part machining process is positive or not is judged, and a third judgment result is obtained;
if the third judgment result shows that the error compensation value in the part machining process is positive, the error compensation scheme in the part machining process is to move the coordinate system of the numerical control machine tool to the positive direction by the error compensation value in the part machining process;
and if the third judgment result shows that the error compensation value in the part machining process is not positive, the error compensation scheme in the part machining process is to move the coordinate system of the numerical control machine tool to the negative direction to obtain the absolute value of the error compensation value in the part machining process.
7. An error compensation planning system based on an on-machine measurement preamble, the system comprising:
the on-line measurement front file construction unit is used for constructing an on-line measurement front file for describing an on-line measurement inspection planning model; the on-machine measurement front file comprises: the method comprises the following steps of (1) obtaining part names, machining work sequence numbers, evaluation results, upper deviations, lower deviations, theoretical values and measuring point information; the station information includes: the measured coordinates of the measuring points and the theoretical coordinates of the measuring points;
the positioning error compensation value acquisition unit before part machining is used for calculating a positioning error compensation value before part machining by adopting a measuring point calculation mode according to the measuring point information in the on-machine measurement front file;
the first compensation mode determining unit is used for compensating by adopting a first compensation mode according to the positioning error compensation value before the part is machined, and the first compensation mode comprises coordinate system alignment and coordinate system straightening;
the error compensation value acquisition unit is used for acquiring an error compensation value in the part machining process according to the difference value between the evaluation result and the theoretical value in the on-machine measurement front file;
and the second compensation mode determining unit is used for compensating by adopting a second compensation mode according to the error compensation value in the part machining process, wherein the second compensation mode is one or more of cutter radius compensation, cutter length compensation and coordinate system compensation.
8. The system for planning error compensation based on-machine measurement front file according to claim 7, wherein the unit for obtaining the positioning error compensation value before the part machining specifically comprises:
the part placing position preset measuring point obtaining subunit is used for selecting two measuring points of which the theoretical coordinates are symmetrical about an original point as a first preset measuring point and a second preset measuring point when the part placing position is corrected;
a first positioning error compensation value obtaining subunit used for obtaining the actual measurement coordinates of the first preset measurement point and the second preset measurement point by using a formula CDZ before the part is machinedi＝(POINT[ei]+POINT[fi]) Determining a first positioning error compensation value CDZ before machining the parti(ii) a Wherein, CDZiFor the first positioning error compensation value, POINT [ e ], before machining partsi]Coordinates of an i coordinate axis of the first preset measuring point，POINT[fi]The coordinate of the coordinate axis i of the second preset measuring point is represented, and i is x, y or z;
the numerical control machine tool rotating shaft preset measuring point obtaining subunit is used for selecting two measuring points with the same z coordinate of a theoretical coordinate as a third preset measuring point and a fourth preset measuring point when the numerical control machine tool rotating shaft is calibrated;
a second positioning error compensation value obtaining subunit used for obtaining the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point by using a formula CDZ according to the x coordinate and the z coordinate of the actual measurement coordinates of the third preset measurement point and the fourth preset measurement point before the part is machinedj＝arctan((POINT*[mz]-POINT*[nz])/POINT*[mj]-POINT*[nj]) Determining a second positioning error compensation value CDZ before machining the partj(ii) a Wherein, CDZjFor a second compensation value of the positioning error, POINT m, before machining the partz]Is the z coordinate, POINT m coordinate, of the measured coordinate of the third predetermined measuring POINTj]J coordinate of measured coordinate of third preset measuring POINT, j ═ x or y, POINT [ n [ ]z]For the measured z-coordinate, POINT n, of the fourth predetermined measurement POINTj]And j is the j coordinate of the measured coordinate of the fourth preset measuring point, and j is x or y.
9. The system according to claim 8, wherein the first compensation mode determining unit specifically includes:
a part placement position error compensation scheme determining subunit, configured to perform calibration on the placement position of the part, where the first compensation mode is coordinate system alignment, and according to the first positioning error compensation value before part processing, determine an error compensation scheme before part processing that is to move the coordinate system along the i axis — CDZiA value;
the error compensation scheme determining subunit is used for correcting the rotating shaft of the numerical control machine tool, the first compensation mode is coordinate system straightening, and according to the second positioning error compensation value before part machining, the error compensation scheme before part machining is determined to be that the coordinate system rotates around the j axis-CDZjA value.
10. The system according to claim 7, wherein the second compensation mode determining unit specifically includes:
a hole axis error compensation scheme determining subunit, configured to, when the type of the part processing location corresponding to the processing tool number is a hole axis, determine that the second compensation mode is tool radius compensation, and according to an error compensation value in the part processing process, determine that the error compensation scheme in the part processing process is compensation processing in which a compensation value for a tool radius is an absolute value of the error compensation value in the part processing process in a next part processing process;
a plane error compensation scheme determining subunit, configured to, when the type of the part processing location corresponding to the processing tool number is a plane, determine that the second compensation mode is tool radius compensation or tool length compensation, and according to an error compensation value in the part processing process, determine that the error compensation scheme in the part processing process is compensation processing in which a compensation value for a tool radius or a tool length is an absolute value of the error compensation value in the part processing process in a next part processing process;
a third judgment result obtaining subunit, configured to, when the types of the parts to be machined corresponding to the machining process number are symmetric, judge whether an error compensation value in the part machining process is positive, where the second compensation mode is coordinate system compensation, and obtain a third judgment result;
a first symmetric error compensation scheme determining subunit, configured to, if the third determination result indicates that the error compensation value in the part processing process is positive, move the coordinate system of the numerical control machine tool to the positive direction by the error compensation value in the part processing process according to the error compensation scheme in the part processing process;
and the second symmetric error compensation scheme determining subunit is configured to, if the third determination result indicates that the error compensation value in the part processing process is not positive, move the coordinate system of the numerical control machine tool in the negative direction by the absolute value of the error compensation value in the part processing process.
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