Error measurement method for machine tool and machine tool
A technology of error measurement and machine tools, which is applied in the direction of measurement/indicating equipment, metal processing machinery parts, program control, etc., can solve the problems of deterioration of processing accuracy, interference of measurement results, and inability to obtain measurement results, so as to achieve accurate measurement results and prevent The effect of deterioration of machining accuracy
Pending Publication Date: 2021-05-25
OKUMA CORP
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Problems solved by technology
[0010] However, when using a touch probe to measure the position of a target on the master workpiece, the measurement result may be mixed with noise due to the influence of foreign matter adhering to the master workpiece, and accurate measurement results may not be obtained.
If the correction control is performed based on the correction parameters calculated based on such measurement results, it may conversely cause deterioration of machining accuracy.
Method used
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Embodiment Construction
[0044] Embodiments of the present invention will be described below with reference to the drawings.
[0045] As applicable machine tools, with figure 1 CNC machine tool as an example to illustrate. However, the machine tool according to the present invention may be other machine tools such as a compound processing machine, a lathe, or a grinding machine.
[0046] In the present invention, as figure 2 As shown, the contact probe 11 is attached to the spindle 2 a of the headstock 2 , the main workpiece 12 to be measured is fixed on the table 3 , and the target position of the main workpiece 12 is measured by the contact probe 11 . figure 2 This is an example of measuring the straightness of the Z-direction component of the X-axis by measuring the target on the plane of the master workpiece 12, but the present invention can also be implemented for the case of measuring the straightness or positioning accuracy of other axes and other components. Here, the numerical control de...
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Error measurement method for a machine tool and a machine tool are provided. The interference can be automatically detected according to the measurement result irrelevant to the shape of the target so as to obtain an accurate measurement result. The error measurement method includes installing a masterwork having a plurality of targets on the table and detecting a position of each of the targets using a sensor mounted to the spindle head to acquire a measured value regarding the position of each of the targets and to acquire an error value regarding the position of each of the targets using each of the acquired measured values and a preliminarily acquired calibration value regarding the position of each of the targets. The error measurement method further includes calculating at least one disturbance index value indicative of a degree of disturbance in the measurement for each of the targets, and determining whether the disturbance index value exceeds a preliminarily set threshold.
Description
technical field [0001] The invention relates to a method of measuring the error of a machine tool and a machine tool capable of performing the method. Background technique [0002] figure 1 is a schematic diagram of a CNC machine tool (machining center) with 3 translational axes. [0003] The headstock 2 can move with two translation degrees of freedom through the X-axis and Z-axis, which are translation axes and are orthogonal to each other, and the table 3 can move one through the Y-axis, which is a translation axis and is orthogonal to the X and Z axes. Motion with translational degrees of freedom. Therefore, the headstock 2 has three translational degrees of freedom relative to the table 3 . Each axis is driven by a servo motor controlled by a numerical controller, the workpiece is fixed on the table 3, and a tool is mounted on the spindle 2a of the headstock 2 to rotate the tool, thereby machining the workpiece into an arbitrary shape. [0004] As the motion accurac...
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IPC IPC(8): B23Q17/22
CPCB23Q17/22G05B19/401G05B2219/37581B23Q17/2233B23Q2717/00B23Q15/24
Inventor 小岛拓也松下哲也
Owner OKUMA CORP