A six-circle identification method for geometric error of machine tool rotation axis based on ballbar measurement
A technology of geometric error and identification method, which is applied in the direction of measuring/indicating equipment, metal processing machinery parts, metal processing equipment, etc., can solve problems such as lack of universality, and achieve a systematic effect
Active Publication Date: 2016-06-01
ZHEJIANG UNIV
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[0008] The current detection methods are mostly related to the machine tool error model, and are generally only applicable to the identification of a specific rotating axis, which is not universal
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[0040]The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0041] attached Figure 5 Shown is the flow chart of the six-circle identification method of the geometric error of the machine tool rotation axis based on the ballbar measurement of the present invention, with the attached figure 1 Shown is a schematic structural diagram of a five-axis CNC machine tool, and the method of the present invention is illustrated by taking the machine tool as an example.
[0042] In step 1, according to the specific type and position of the machine tool's rotary axis, determine the six measurement positions of the ballbar in the rotary axis coordinate system, including steps:
[0043] Step 1.1. Determine the machine tool rotation axis type as A axis and C axis. This embodiment takes the machine tool C axis as an example. According to the structure of the machine tool and the position of the C-axis, set the origin o...
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The invention discloses a machine tool rotating shaft geometry error six-circle identifying method based on measuring of a ball bar instrument. The method comprises the following steps of determining six measuring positions of the ball bar instrument according to the type and position of a machine tool rotating shaft, obtaining the relation of the readings of the ball bar instrument at all positions and the geometry error of the rotating shaft according to the influence of the geometry error of the rotating shaft to the machine tool precision and in combination with the direction of the ball bar instrument at six measuring positions, obtaining an identifying matrix M of the geometry error of the rotating shaft, by combining each geometry error definition of the rotating shaft, obtaining an identifying formula of the geometry error of the rotating shaft, selecting appropriate coordinates for the six measuring positions to install the ball bar instrument, operating corresponding machine tool codes, obtaining the corresponding readings of the ball bar instrument at the six positions of the rotating shaft, substituting the readings of the ball bar instrument and the measuring position coordinates into the identifying formula of the geometry error of the rotating shaft, and obtaining all 10 geometry errors of each rotating shaft. The method is suitable for the rotating shafts in different types without principle error, the system entry is good, the measuring is convenient, and the identifying precision is high.
Description
technical field [0001] The invention relates to the technical field of numerical control machine tool design, in particular to a six-turn identification method for the geometric error of a machine tool rotation axis based on ballbar measurement. Background technique [0002] With the improvement of processing accuracy requirements and workpiece complexity, the proportion of five-axis CNC machine tools in the manufacturing industry is increasing. The machining accuracy of the machine tool has a great influence on the quality of the workpiece, and it is an important criterion for measuring a machine tool. The geometric error has good repeatability and is stable for a long time, so it is easy to realize the compensation of the geometric error to improve the machining accuracy of the machine tool. [0003] The geometric error model of CNC machine tool is the basis of geometric error compensation. These models can be used to predict and compensate the geometric error of the mach...
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IPC IPC(8): B23Q17/00
CPCB23Q17/00
Inventor 傅建中付国强贺永赖金涛
Owner ZHEJIANG UNIV