CN111060049A - Method for verifying workpiece coordinate system conversion stability of three-coordinate measuring machine - Google Patents
Method for verifying workpiece coordinate system conversion stability of three-coordinate measuring machine Download PDFInfo
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- CN111060049A CN111060049A CN201911409049.1A CN201911409049A CN111060049A CN 111060049 A CN111060049 A CN 111060049A CN 201911409049 A CN201911409049 A CN 201911409049A CN 111060049 A CN111060049 A CN 111060049A
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- coordinate system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
Abstract
The invention discloses a method for verifying the conversion stability of a workpiece coordinate system of a three-coordinate measuring machine, which belongs to the technical field of verifying the three-coordinate measuring machine and solves the technical problem that the conventional verification method of the three-coordinate measuring machine cannot verify the conversion stability of the workpiece coordinate system. The invention can effectively verify the conversion stability of the coordinate system of the workpiece.
Description
Technical Field
The invention relates to the technical field of verification of three-coordinate measuring machines, in particular to a method for verifying the conversion stability of a workpiece coordinate system of a three-coordinate measuring machine.
Background
The coordinate measuring machine is a detector which can move in three directions in space, and can sample each workpiece element after establishing a workpiece coordinate system, and can calculate the coordinate values of each element (x, y, z) of the workpiece through software processing and realize each evaluation function. The three-coordinate measuring machine comprises a mechanical structure part and a detection software part, wherein the detection software part is used for controlling the mechanical structure part to operate, acquiring detection data, processing data and outputting results. Currently, only three-coordinate measuring machines are usedAnd the method is limited to the assessment and acceptance of data stability and incomplete detection software categories. The items that are typically accepted for a three-coordinate measuring machine are: maximum indication error (MPE)E) Maximum detection error (MPE)P) Maximum scanning detection error (MPE)THP). The necessary examination and acceptance of the detection software in the processes of sampling and data processing under different working conditions are lacked. In actual working requirements, when a three-coordinate measuring machine is in different working conditions, for example, a newly generated workpiece coordinate system is disordered after the workpiece coordinate system is rotated, actual requirements cannot be met, and adverse effects on detection, production, quality control and the like are caused.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for verifying the transformation stability of a coordinate system of a coordinate measuring machine.
The technical scheme of the invention is as follows: a method for verifying the conversion stability of a workpiece coordinate system of a three-coordinate measuring machine sequentially comprises a step of establishing the workpiece coordinate system, a step of rotating the workpiece coordinate system and a step of verifying the workpiece coordinate system, wherein after the workpiece coordinate system is rotated, the step of verifying the workpiece coordinate system is to move a measuring head of the three-coordinate measuring machine along a single axis of the workpiece coordinate system, and whether the conversion of the workpiece coordinate system meets the requirement is judged according to the relation between the coordinate value variable quantity displayed by the three-coordinate measuring machine in real time and the actual movement quantity of the measuring head.
As a further improvement, the method comprises the following specific steps:
s1, establishing a workpiece coordinate system: establishing an initial workpiece coordinate system through detection software of a three-coordinate measuring machine;
s2, rotating a workpiece coordinate system: rotating the initial workpiece coordinate system around any axis thereof by a specific angle to obtain a rotating workpiece coordinate system;
s3, verifying a workpiece coordinate system: controlling the measuring head of the three-coordinate measuring machine to reciprocate along each single axis of the rotating workpiece coordinate system in sequence, and if the coordinate value variation quantity displayed by the three-coordinate measuring machine is consistent with the actual movement quantity of the measuring head, turning to step S4; otherwise, judging that the requirements are not met and finishing the verification;
s4, accumulating the cycle times N by 1, if N reaches a cycle threshold value N, judging that the requirement is met and finishing verification; otherwise, the rotating object coordinate system is changed to the initial object coordinate system and returns to step S2.
Further, the coordinate value displayed by the three-coordinate measuring machine is one and corresponds to the currently verified axis.
Further, the cycle threshold N >1, and the axes about which the initial object coordinate system in adjacent re-rotations do not coincide.
Furthermore, the angle of each rotation of the initial workpiece coordinate system is 40-50 degrees.
Further, the initial object coordinate system is rotated by 45 ° each time.
Advantageous effects
Compared with the prior art, the invention has the advantages that: and items that are generally accepted for three-coordinate measuring machines: maximum indication error (MPE)E) Maximum detection error (MPE)P) Maximum scanning detection error (MPE)THP) Compared with hardware items with emphasis, the method substantially increases the verification of the conversion stability of the coordinate system belonging to the software class, can reduce or avoid the probability of influence on work due to the detection of software defects to a greater extent, and updates and supplements the acceptance standard of the three-coordinate measuring machine.
Drawings
FIG. 1 is a schematic diagram of establishing a coordinate system of a workpiece according to the present invention;
FIG. 2 is a schematic view of a first rotation of the workpiece coordinate system in accordance with the present invention;
FIG. 3 is a schematic diagram of a second rotation of the workpiece coordinate system in accordance with the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1-3, a method for verifying the conversion stability of a workpiece coordinate system of a three-coordinate measuring machine sequentially comprises a step of establishing the workpiece coordinate system, a step of rotating the workpiece coordinate system and a step of verifying the workpiece coordinate system, wherein after the workpiece coordinate system is rotated, the step of verifying the workpiece coordinate system is to move a measuring head of the three-coordinate measuring machine along a single axis of the workpiece coordinate system, and whether the conversion of the workpiece coordinate system meets the requirement is judged according to the relation between the coordinate value variation quantity displayed by the three-coordinate measuring machine in real time and the actual movement quantity of the measuring head.
The method comprises the following specific steps:
s1, establishing a workpiece coordinate system: establishing an initial workpiece coordinate system through detection software of a three-coordinate measuring machine;
s2, rotating a workpiece coordinate system: rotating the initial workpiece coordinate system around any axis thereof by a specific angle to obtain a rotating workpiece coordinate system;
s3, verifying a workpiece coordinate system: controlling the measuring head of the three-coordinate measuring machine to reciprocate along each single axis of the rotating workpiece coordinate system in sequence, and if the coordinate value variation quantity displayed by the three-coordinate measuring machine is consistent with the actual movement quantity of the measuring head, turning to the step S4; otherwise, judging that the requirements are not met and finishing the verification;
s4, accumulating the cycle times N by 1, if N reaches a cycle threshold value N, judging that the requirement is met and finishing verification; otherwise, the rotating object coordinate system is changed to the initial object coordinate system and returns to step S2.
As shown in FIG. 1, an initial workpiece coordinate system XYZ is established from a plane A and pin holes O, O1 thereon, and as shown in FIG. 2, the initial workpiece coordinate system XYZ is rotated about the Z-axis to obtain a rotated workpiece coordinate system X1Y1Z1. As shown in fig. 3, the rotating object coordinate system X1Y1Z1Around X1Rotation of the shaft to obtain a coordinate system X of the rotating workpiece2Y2Z2。
The coordinate value displayed by the coordinate measuring machine is one and corresponds to the currently verified axis along which the probe moves, such as verification X1The axis corresponding to the change of the X coordinate value verifies Y1The change of the axis corresponding to the Y coordinate value verifies Z1The axis is changed corresponding to the Z coordinate value, and the disorder between X/Y/Z is not allowed.
Cycle threshold N>1, and are adjacent to each otherThe axes about which the initial workpiece coordinate system is rotated in the second rotation are not coincident, e.g., the first rotation is about the Z-axis and the second rotation is about the X-axis. The rotation angle of the initial workpiece coordinate system is 40-50 degrees every time, because the probability of the three-coordinate machine having problems in the rotation angle range is high, and the probability of the three-coordinate machine having problems in other rotation angle ranges is low, the rotation frequency of the coordinate system can be reduced by verifying according to the rotation angle range, and the verification work efficiency is improved. Preferably, the initial object coordinate system is rotated by 45 ° each time. In the present embodiment, the cycle threshold N is 2, i.e. the object coordinate system is rotated only twice. E.g. after the first rotation, along Y1When moving the measuring-machine measuring-head in the positive direction of the axis, i.e. along space Y1The axes move in parallel, and the real-time displayed Y coordinate indication value of the measuring machine is gradually increased; or along Y1When the measuring head of the measuring machine is moved in the negative direction of the shaft, the real-time displayed coordinate Y indicating value of the measuring machine is gradually reduced, and the indicated coordinate value variable quantity is consistent with the actual moving quantity of the measuring head. The same applies to the determination of the other axes. After the second rotation, along Y2When moving the measuring-machine measuring-head in the positive direction of the axis, i.e. along space Y2The axes move in parallel, and the real-time displayed Y coordinate indication value of the measuring machine is gradually increased; or along Y2When the measuring head of the measuring machine is moved in the negative direction of the shaft, the real-time displayed coordinate Y indicating value of the measuring machine is gradually reduced, and the indicated coordinate value variable quantity is consistent with the actual moving quantity of the measuring head. The same applies to the determination of the other axes.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (6)
1. A method for verifying the conversion stability of a workpiece coordinate system of a three-coordinate measuring machine sequentially comprises a step of establishing the workpiece coordinate system, a step of rotating the workpiece coordinate system and a step of verifying the workpiece coordinate system, and is characterized in that after the workpiece coordinate system is rotated, the step of verifying the workpiece coordinate system is to move a measuring head of the three-coordinate measuring machine along a single axis of the measuring head, and whether the workpiece coordinate system conversion meets the requirement is judged according to the relation between the coordinate value variation quantity displayed by the three-coordinate measuring machine in real time and the actual movement quantity of the measuring head.
2. The method for verifying the conversion stability of the workpiece coordinate system of the coordinate measuring machine according to claim 1, comprising the following steps:
s1, establishing a workpiece coordinate system: establishing an initial workpiece coordinate system through detection software of a three-coordinate measuring machine;
s2, rotating a workpiece coordinate system: rotating the initial workpiece coordinate system around any axis thereof by a specific angle to obtain a rotating workpiece coordinate system;
s3, verifying a workpiece coordinate system: controlling the measuring head of the three-coordinate measuring machine to reciprocate along each single axis of the rotating workpiece coordinate system in sequence, and if the coordinate value variation quantity displayed by the three-coordinate measuring machine is consistent with the actual movement quantity of the measuring head, turning to step S4; otherwise, judging that the requirements are not met and finishing the verification;
s4, accumulating the cycle times N by 1, if N reaches a cycle threshold value N, judging that the requirement is met and finishing verification; otherwise, the rotating object coordinate system is changed to the initial object coordinate system and returns to step S2.
3. The method of claim 2, wherein the coordinate values displayed by the coordinate measuring machine are one and correspond to the currently verified axis.
4. A method of verifying the stability of a transformation of a work piece coordinate system of a coordinate measuring machine according to claim 2, wherein the cycle threshold N >1 and the axes around which the initial work piece coordinate system is rotated in adjacent revolutions do not coincide.
5. A method for verifying the conversion stability of the workpiece coordinate system of a coordinate measuring machine according to any one of claims 2-4, wherein the initial workpiece coordinate system is rotated at an angle of 40 ° to 50 ° each time.
6. A method of verifying the stability of a transformation of a work piece coordinate system of a coordinate measuring machine according to claim 5, wherein the initial work piece coordinate system is rotated 45 ° each time.
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Application publication date: 20200424 |