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Modeling Method of Tool Axis in Multi-Axis Milling Considering Tool Runout

A multi-axis milling and tool axis technology, applied in instruments, geometric CAD, calculations, etc., to achieve the effects of improving machining accuracy, simple measurement process, and fast data processing

Active Publication Date: 2019-07-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Considering the influence of the spindle motion error and tool installation error on the axis motion of the milling tool, the mathematical modeling of the tool axis motion model was solved, and the unknown parameters in the model were calibrated using the particle swarm optimization algorithm

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  • Modeling Method of Tool Axis in Multi-Axis Milling Considering Tool Runout
  • Modeling Method of Tool Axis in Multi-Axis Milling Considering Tool Runout
  • Modeling Method of Tool Axis in Multi-Axis Milling Considering Tool Runout

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Embodiment Construction

[0062] Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0063] The machine tool used in this embodiment is Shandong Yonghua YHVT850Z. The main shaft used in this machine tool is Taiwan Luo Yi 1453448000 type main shaft, and what the main shaft uses is a P4 precision angular contact bearing. According to the radial runout accuracy of angular contact bearings in the standard GB / T 307.2-2005, the parameter constraint condition 0≤a can be determined 1 ≤4, 0≤b 1 ≤4, 0≤a 2 ≤4, 0≤b 2 ≤4, (unit: micron). According to the manufacturing tolerance of collets in GB / T 25378-2010, the parameter constraint condition 0≤ρ can be determined 1 ≤20, 0≤ρ 2 ≤20 (unit: micron). According to GB 10944.1-2006 / ISO 7388-1:1983, it can be determined that -300≤Δ 3 ≤0 (unit: micron). In addition to the above constraints, other angular ...

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Abstract

The invention provides a method for building a model of multi-spindle milling tool axis considering tool jump. The method firstly provides a motion model of a spindle considering the radial error of a bearing inner race and an error model for mounting tool, and expresses every component of a spindle system and the errors through building a regional coordinate, then arrives at the tool axis motion model of the spindle motion error and the mounting errors of a tool handle and a spring collet by adopting the method of coordinate transformation. Considering the effects of the spindle motion error and the error of mounting the tool on the axis motion of the milling tool, the method solves the problem of mathematical model building for the tool axis motion, and uses the particle swarm optimization method to calibrate the unknown parameters in the model. The model built by the method can distinctly describe the motions of a spindle, the provided parameter calibration method has the advantages of being simple in measuring procedures and being fast in data processing, and provides theoretical foundation for limiting tool jump and increasing processing precision, and thereby the errors introduced by every component can be analyzed according to the model in the machining process.

Description

technical field [0001] The invention belongs to the technical field of multi-axis numerical control machining, and relates to the research on the modeling of the movement of the axis of a milling tool considering the movement error of the machine tool spindle and the installation error of the tool. Background technique [0002] In CNC machining, the tool jump will cause the instantaneous pose of the tool axis to deviate from the ideal state, change the relative positional relationship between the tool and the workpiece, cause uneven cutting thickness of each tooth, and easily cause overcutting, undercutting and other phenomena. Tool jump cannot be completely avoided, which seriously restricts the further improvement of machining accuracy. In the case of tool runout, establishing a tool axis motion model has become one of the hot issues in current research. Due to the manufacturing and installation errors of machine tool spindles, tool handles and tools, it is inevitable tha...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 孙惠斌赵紫东常智勇张栋梁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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