Benchmark selection method for minimizing hole site errors of large component group hole machining

A technology for machining hole position and machining datum, which is applied in the field of datum selection with the smallest hole position error in the machining of large parts groups, and can solve the problems affecting the machining accuracy of multi-axis CNC machine tools, the outline of parts is too large, and the processing quality requirements are high.

Active Publication Date: 2021-03-26
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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  • Benchmark selection method for minimizing hole site errors of large component group hole machining
  • Benchmark selection method for minimizing hole site errors of large component group hole machining
  • Benchmark selection method for minimizing hole site errors of large component group hole machining

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Experimental program
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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 benchmark selection method for minimizing hole position errors of large component group hole machining, which comprises the following steps of: 1) determining the type of a numerical control machine tool, and establishing a topological structure of the numerical control machine tool; 2) establishing a theoretical pose model of a tool nose point in the movement process; 3)establishing a hole site error model; 4) establishing a hole site average error model of group hole machining; and 5) obtaining the machining reference of the corresponding component group holes. According to the method, different benchmark selection principles are provided for aircraft component framework and skin group hole machining, the position precision of framework or skin group hole machining can be effectively improved, and meanwhile a more scientific and reasonable method is provided for selection of a large component group hole machining benchmark; by calculating the average valueof the hole site errors of a certain point in the space points and the hole sites of the group holes, the reference with the minimum hole site error is deduced, and the method is more scientific and reasonable; the method can also be applied to other numerical control machining fields and is suitable for wide popularization and 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 Applications(China)
IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/35356Y02P90/02
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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