Rotary shaft and position-independent geometric error identification method based on ball-bar 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 the problem of few fast and effective detection methods

Inactive Publication Date: 2018-11-02
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are relatively few simple, fast and effect

Method used

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  • Rotary shaft and position-independent geometric error identification method based on ball-bar measurement
  • Rotary shaft and position-independent geometric error identification method based on ball-bar measurement
  • Rotary shaft and position-independent geometric error identification method based on ball-bar measurement

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0072] 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.

[0073] In step 1, determine the measurement position of the ballbar according to the structure of the machine tool and the type of the rotary axis. Install the spindle tool cup and the base tool cup, and perform calibration, including steps:

[0074] Step 1.1. Determine the rotary axis type of the machine tool as A-axis and C-axis, and define the reference coordinate system as the intersection of the A-axis rotary center and the C-axis rotary center under ideal conditions.

[0075] Step 1.2. Determine the installation positions of the spindle tool cup and the base tool cup. When measuring the A-axis, the ballbar base is installed on the A-axis turnt...

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Abstract

The invention discloses a rotary shaft and position-independent geometric error identification method based on ball-bar measurement. The method comprises the following steps of determining the measurement position of a ball-bar according to the structure of a machine tool and the type of rotary shafts, mounting a spindle tool cup and a base tool cup and conducting correction; mounting the ball-bar, detecting the shaft A and the shaft C without a lengthening bar to obtain ball-bar readings, and conducting compensation calculation on position errors of the shaft A and the shaft C; changing the length of the ball-bar by additionally arranging the lengthening bar, changing the position of the spindle tool cup, rotating the shaft A and the shaft C correspondingly to obtain the ball-bar readingsand obtaining eight position-independent geometric errors of the rotary shafts of the machine tool through calculation. Through the method, the position-independent geometric errors of the rotary shafts can be identified quickly and effectively, the identification precision is high, and the practicality is good.

Description

technical field [0001] The invention relates to the technical field of geometric error identification of a multi-axis numerically controlled machine tool, in particular to a geometric error identification method based on ballbar measurement that is independent of the position of a rotary axis. technical background [0002] One of the most important criteria in modern manufacturing is the ability to achieve high precision. Five-axis CNC machining has the advantages of high precision and relatively simple operation requirements, so it is widely used in modern manufacturing. It is difficult to process parts such as impellers with traditional three-axis machine tools, but these parts can be easily processed by five-axis machine tools. In addition to three linear axes, five-axis machines also have two rotary axes. However, rotary axes introduce additional sources of error, which can lead to imperfections and defects in machined parts. Therefore, in order to ensure the accuracy...

Claims

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Application Information

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IPC IPC(8): B23Q17/00
Inventor 蒋晓耕姚思涵
Owner TIANJIN POLYTECHNIC UNIV
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