Longitudinal tensile loading trajectory design method based on mold surface extension

Abstract

The invention relates to the aviation aircraft manufacturing field and relates to a longitudinal tensile loading trajectory design method based on mold surface extension. The method includes the following steps: 1, extending the mold surface, the wollens covers the mold surface via the action of the clamp during the forming process, and the material has the shape having the part curved surface; 2, calculating the jaw position and space posture, obtaining the final covering condition of the wollens during the forming process in the mold surface extending process, respectively processing the curves at two ends of the extending curved surface; (1) jaw curve scattering, (2) calculating clamp plane, (3) calculating curved clamp angle; 3, solving the movement of pulling device, designing loading trajectory of the pulling middle step, calculating according to the final device parameter; (1) calculating the pitching angle of clamp, (2) calculating the extending part of the pulling action cylinder. The longitudinal tensile loading trajectory design method based on mold surface extension can offer the guiding function for the skin longitudinal shape trajectory design and trajectory optimization.

Description

technical field [0001] The invention relates to the field of aviation aircraft manufacturing, in particular to a method for designing a longitudinal tensile loading trajectory based on mold surface extension. Background technique [0002] Skin parts are exterior parts that form and maintain the aerodynamic shape of an aircraft. Stretch forming (referred to as stretch forming) is a process method of overmolding with a mold, and it is one of the main forming methods for forming aircraft skin parts. The two sides of the wool are clamped by the clamp of the equipment, and the movement of the mold and the clamp is used to make the wool produce uneven stretching deformation, and the mold is covered to make the wool and the mold fit. The skin stretching loading trajectory refers to the three-dimensional movement path of the stretching machine clamp relative to the stretching die. Aircraft skin drawing is a complex rotary forming process, and the movement track of the clamp has a ...

AI Technical Summary

Problems solved by technology

[0003] In recent years, domestic aviation manufacturing enterprises have generally introduced advanced CNC stretch forming machines, which has established a good hardware environment for improving the level of skin manufacturing and product quality, but lacks the definition of loading trajectory and programming software for CNC stretch forming machines that match the equipment. As well as the supporting process parameter design and optimization comparison solutions, generally the process program and parameters are roughly determined through repeated trial and error, and the final production process plan is determined by manual control or only by using the teaching function of the CNC drawing equipment

This makes the precise control function of the numerical control stretching equipment for deformation unable to play, it is difficult to meet the production requirements of new aircraft skin parts, and it also seriously restricts the improvement of the overall level of my country's aircraft manufacturing

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