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A datum selection method with minimum hole position error for group hole machining of large parts

A technology for processing hole positions and large parts, which is applied in the field of mechanical processing, can solve the problems of high processing quality requirements, large part outlines, and affecting the machining accuracy of multi-axis CNC machine tools, and achieve the effect of improving position accuracy and hole position accuracy

Active Publication Date: 2021-08-03
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of CNC machining, the movement of the motion axis is based on the selected datum as a reference, and then relative motion is carried out, and then the selection of the process datum in the processing process will have a direct impact on the motion stroke of the motion axis, and ultimately affect the machining accuracy of the multi-axis CNC machine tool
Large component group hole processing tasks require high processing quality, and the component contour is too large

Method used

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  • A datum selection method with minimum hole position error for group hole machining of large parts
  • A datum selection method with minimum hole position error for group hole machining of large parts
  • A datum selection method with minimum hole position error for group hole machining of large parts

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Embodiment 1

[0074] This embodiment provides a method for selecting the best reference for group hole processing of parts, the specific flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0075] (1) Determine the type of CNC machine tool, simplify the topology of the machine tool according to the low-order body array method, and perform low-order body numbering on the corresponding motion units.

[0076] (2) Based on the multi-body system theory and the pose error and geometric error of each motion axis, the theoretical pose model of the tool tip point during the motion process is established.

[0077] (3) According to the distance between the actual position of the tool tip point and the theoretical position during the hole making process, and through the projection relationship with the plane perpendicular to the ideal axis, the hole position error model is established.

[0078] (4) There are usually two forms of component group hole processing: ...

Embodiment 2

[0082] In this embodiment, the AC swing-angle five-axis CNC machine tool is taken as an example, and a benchmark is selected for it. The AC swing-angle five-axis CNC machine tool, such as figure 2 As shown, it consists of the following parts: machine bed, X-axis motion unit, Y-axis motion unit, Z-axis motion unit, C-axis motion unit and A-axis motion unit.

[0083] The topology of the five-axis CNC machine tool, such as figure 2 As shown, specifically: machine bed 0→X-axis motion unit 1→Y-axis motion unit 2→Z-axis motion unit 3→C-axis motion unit 4→A-axis motion unit 5, wherein the C-axis motion unit 4 pivotally Connected to the Z-axis motion unit 3, the A-axis motion unit 5 is pivotally connected to the C-axis motion unit 4, the processing spindle is fixedly connected to the A-axis 5, and the tool is placed and clamped on the processing spindle. For the convenience of error modeling, each feed axis is fixedly connected to the motion coordinate system, and the fixedly conne...

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Abstract

The invention discloses a datum selection method with the minimum hole position error for group hole machining of large components, comprising the following steps: 1) determining the type of a numerical control machine tool, and establishing the topology structure of the numerical control machine tool; 2) establishing the theory of the tool tip point during the movement process Pose model; 3) Establish a hole position error model; 4) Establish a hole position average error model for group hole processing; 5) Obtain the processing benchmark of the corresponding component group holes. The present invention is oriented to the machining of aircraft component skeleton and skin group holes, and provides different benchmark selection principles for the processing of aircraft component skeleton and skin group holes, which will effectively improve the position accuracy of skeleton or skin group hole processing, and at the same time It provides a more scientific and reasonable method for the selection of group hole processing benchmarks for large parts; by calculating the average value of the hole position error between a certain point in the space point and the group hole point, the benchmark with the smallest hole position error is deduced, which is more scientific and reasonable ; It can also be used in other numerical control processing fields, and is suitable for wide application.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a datum selection method with the minimum hole position error for large component group hole processing. Background technique [0002] In the process of aircraft assembly, the assembly between structural parts is mainly based on mechanical connection, and the processing quality of connection holes has a very important impact on improving connection accuracy, improving aircraft performance and service life. Using the traditional manual drilling method, although some targeted measures can be combined to improve the processing quality and processing efficiency of the connecting hole to a certain extent, it can not meet the assembly quality and efficiency requirements. Therefore, in order to improve the aircraft assembly quality and efficiency , Multi-axis linkage CNC machine tools are more and more widely used in the field of aircraft assembly and manufacturing. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/35356Y02P90/02G05B19/402G05B2219/36201
Inventor 李杰刘大炜马振博刘元吉勾江洋谢颖帅朝林陈雪梅卢大伟陈清良
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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