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Machine tool geometric error measurement method based on ball rod instrument

A technology of geometric error and measurement method, which is applied in the direction of measuring/indicating equipment, metal processing machinery parts, metal processing equipment, etc., can solve problems such as inability to measure linear axis and rotary axis errors, achieve good practicability, improve detection efficiency, The effect of high measurement accuracy

Inactive Publication Date: 2020-11-03
TIANJIN UNIV
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Problems solved by technology

[0004] With the development of error measurement technology, scholars at home and abroad have proposed a variety of machine tool error measurement methods based on ballbars, but these methods cannot simultaneously measure the errors of linear axes and rotary axes

Method used

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  • Machine tool geometric error measurement method based on ball rod instrument
  • Machine tool geometric error measurement method based on ball rod instrument
  • Machine tool geometric error measurement method based on ball rod instrument

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0054] attached figure 1 Shown is a schematic structural diagram of a five-axis CNC machine tool, and the method of the present invention is described by taking the machine tool as an example.

[0055] In step 1, the geometric error model of the five-axis machine tool is established based on the spiral theory, including steps:

[0056] Step 1.1. The kinematic chain of the five-axis machine tool is divided into a tool chain and a workpiece chain. The two kinematic chains are as follows:

[0057]

[0058]

[0059] where g bt with g bw Indicates the position of the tool and the workpiece relative to the machine tool coordinate system under ideal conditions, g bt (0) with g bw (0) represents the initial position of the tool and the workpiece relative to the machine tool coordinate system under ideal conditions, They are X-axis screw, Y-a...

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Abstract

The invention discloses a machine tool geometric error measurement method based on a ball rod instrument. The method comprises the following steps of establishing a five-axis machine tool geometric error model based on a spiral theory; establishing a mathematical model of constant-speed linkage of an X axis and a C axis of a machine tool, ensuring that constant-speed acquisition data of the ball rod instrument is synchronous with actual motion in the measurement process, and calculating machine tool codes through the mathematical model; and using the machine tool codes for carrying out a measurement experiment, performing error decoupling on the data measured by the ball rod instrument based on a particle swarm algorithm, and obtaining six geometric errors in a two-axis linkage measurementprocess. The method can measure the geometric errors of a linear shaft and a rotating shaft at the same time, and is high in measurement precision and good in practicability.

Description

technical field [0001] The invention relates to the technical field of error measurement of a five-axis machine tool, in particular to a method for measuring the geometric error of a machine tool based on a ballbar. [0002] technical background [0003] Compared with three-axis machine tools, five-axis machine tools can process complex curved surfaces, which have the advantages of efficient processing and convenient clamping. However, the structure of the five-axis machine tool is more complex, and the two rotary axes introduce additional geometric errors to it, and there is also a certain error coupling between the linear axis and the rotary axis, which greatly affects the accuracy of the machine tool. Therefore, in order to ensure the accuracy of the machine tool, it is necessary to measure the geometric error of the linear axis and the rotary axis. [0004] With the development of error measurement technology, scholars at home and abroad have proposed a variety of machin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q17/22
CPCB23Q17/22
Inventor 张福民姚思涵蒋晓耕郑继辉曲兴华
Owner TIANJIN UNIV
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