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Universal rotary shaft position-independent geometric error identification method

A technology of geometric error and identification method, applied in metal processing mechanical parts, measuring/indicating equipment, metal processing equipment, etc., can solve problems such as poor practicability

Active Publication Date: 2018-02-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of the existing general-purpose rotation axis geometric error identification method, the present invention provides a general-purpose rotation axis and position-independent geometric error identification method

Method used

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  • Universal rotary shaft position-independent geometric error identification method
  • Universal rotary shaft position-independent geometric error identification method
  • Universal rotary shaft position-independent geometric error identification method

Examples

Experimental program
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Embodiment Construction

[0086] Reference Figure 1-8 . The CNC machine tool structure is selected as the BC cradle type five-axis CNC machine tool. In particular, the axis of the swing axis of the CNC machine tool is close to the table surface. Carry out two sets of ballbar experiments on the B axis and C axis respectively. The first set of experiments requires that the ballbar axis is always along the radial direction of the rotation axis during the experiment. The second set of experiments requires the ballbar axis during the experiment. Always follow the axial direction of the axis of rotation. Due to the structure limitation, the tool ball 1 cannot be placed on the axis of the rotating shaft for B-axis measurement. The measurement is carried out by the linkage of B-axis, X-axis and Z-axis. When measuring the C axis, place the tool ball 1 on the axis of the rotation axis, and only use the rotation of the C axis for measurement. The origin of the reference coordinate system is selected as the inte...

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Abstract

The invention discloses a universal rotary shaft position-independent geometric error identification method which is used for solving the technical problem that existing universal rotary shaft geometric error identification methods are poor in practicality. According to the technical scheme, firstly, two rotary shafts are subjected to two double-ball bar tests correspondingly, and double-ball barlength data in the first test and double-ball bar length data in the second test are recorded; secondly, aiming at the double-ball bar length data in the first test, position errors of the two rotaryshafts are identified through a plane circle fitting method; thirdly, space motion tracks of workpiece balls of a double-ball bar are built through the identified position errors and the double-ball bar length data in the first test; and finally, direction errors of the two rotary shafts are identified through a space plane fitting method. According to the universal rotary shaft position-independent geometric error identification method, precise balls of the double-ball bar do not need to be placed on the axes of the rotary shafts, thus, the universal rotary shaft position-independent geometric error identification method can be suitable for numerically-controlled machine tools of any structures, and the practicality is good.

Description

Technical field [0001] The invention relates to a method for identifying geometric errors of a universal rotating shaft, in particular to a method for identifying geometric errors of a universal rotating shaft independent of position. Background technique [0002] Literature 1 "KILee, SHYang, Robust measurement method and uncertainty analysis for position-independent geometric errors of a rotary axis using a double ball-bar, International Journal of Precision Engineering and Manufacturing 14(2013) 231-239." discloses a use The ballbar only uses the rotation of the rotation axis to identify the position-independent geometric errors (PIGEs) of the rotation axis of CNC machine tools. This method establishes the relationship between the eccentricity of the ballbar track and the error components of PIGEs and separates the error components by performing ballbar experiments at two different positions on the axis of the rotation axis. However, this method must place the tool ball of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q17/00
CPCB23Q17/00B23Q2017/001
Inventor 万敏刘洋张卫红邢婉静
Owner NORTHWESTERN POLYTECHNICAL UNIV