Location method of thin wall curve part based on bounding box in multi-point array flexible tool

A technology of flexible tooling and positioning method, applied in the direction of measuring devices, instruments, etc., to achieve the effect of simple method, reduced number and easy to understand

Inactive Publication Date: 2012-09-19
HOHAI UNIV CHANGZHOU
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of existing methods, a method for positioning thin-walled curved surface parts based on bounding boxes for multi-point array flexible tooling is proposed

Method used

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  • Location method of thin wall curve part based on bounding box in multi-point array flexible tool
  • Location method of thin wall curve part based on bounding box in multi-point array flexible tool
  • Location method of thin wall curve part based on bounding box in multi-point array flexible tool

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Embodiment Construction

[0023] Let the multi-point array flexible tooling coordinate system be , the coordinate system of the thin-walled surface part is , then the positioning process of thin-walled curved surface parts in the flexible tooling coordinate system can be described by the transformation matrix T, which can be specifically written as:

[0024]

[0025] In the formula, T i (i=1,2) and T 3 Respectively expressed as:

[0026]

[0027]

[0028] In the formula, the letter c represents the cos function, the letter s represents the sin function, T 1 Indicates the pre-positioning rotation matrix, T 2 Represents the fine positioning rotation matrix, T 3 Represents the translation matrix. Specifically involved in the matrix solution method and positioning process in accordance with the following steps:

[0029] 1. Construct parametric equations for thin-walled curved parts

[0030] The shape of thin-walled surface parts is described by B-spline surface, and its expression is:

...

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Abstract

The invention relates to a location method of a thin wall curve part based on a bounding box in a multi-point array flexible tool. The location process of the thin wall curve part in the flexible tool is a process that the curve is located in a working area of the tool, and the essence is coordinate transformation. The working area of the multi-point array flexible tool at home and abroad is generally expressed through a hexahedron, the location problem of the thin wall curve part can be converted into calculation of a hexahedron bounding box enclosing the thin wall curve part, and unknown quantity referred to in a coordinate transformation array is defined according to similarity of the bounding box and the working area of the flexible tool, namely calculation of the bounding box of the thin wall curve part. The curve part is contacted with support rods as many as possible in the flexible tool to improve support location stability, namely the projection area of the curve in tool plane is largest. The location process mainly relates to three steps: primary location, fine location and translation, then a parameterization curve equation of the curve part in a tool coordinate system is calculated according to the coordinate transformation array, and finally the height of the support rods is calculated according to the position of the support rods in the flexible tool.

Description

technical field [0001] The invention relates to a positioning method for curved surface parts, in particular to a bounding box-based positioning method for thin-walled curved surface parts for multi-point array flexible tooling. Background technique [0002] The typical manufacturing process of some thin-walled curved surface parts in the industry, such as aircraft thin-walled curved surface parts, is to form first and then process. Machining operations such as measuring, contouring, trimming, drilling, etc. present great difficulties. The traditional processing positioning of thin-walled curved parts mainly relies on mold line templates with product shape characteristics and standard process equipment, that is, the surface of the tooling needs to have the same curved shape as the thin-walled curved parts. The traditional positioning method has many coordination links, which has a great impact on the accuracy of parts, and the tooling is bulky. A set of tooling is only for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00
Inventor 张洪双
Owner HOHAI UNIV CHANGZHOU
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