Airplane covering transversal stretch forming loading track designing and numerical control code generating method

Abstract

The invention discloses an aircraft skin transverse stretch-forming loading trajectory design and numerical control code generation method based on an ACB FET Series numerical control transverse stretching machine; the method comprises three steps: step one: the cross-section line is calculated by a transverse stretch-forming loading trajectory design (1); (2) the loading trajectory is searched; step two: the offset of a reference point is searched; step three: an inverse solution (1) mechanism analysis of the mechanism position is carried out; (2) a movement solution is carried out. The method firstly designs the space movement position and the attitude of a stretch-forming machine clamp in accordance with the deforming state of wools; and converts the loading trajectory into the numerical control code of the equipment by the inverse solution, thus improving the efficiency and accuracy of the stretch-forming process parameter design. As an optimization comparison is carried out by using the method, a more optimal production process proposal can be obtained, and scientificalization, digitalization and controllability of the aircraft skin transverse stretch-forming are realized. The invention has wide range of practical value and application prospect.

Description

(1) Technical field: [0001] The invention relates to an aircraft skin stretch trajectory design method, in particular to an aircraft skin transverse stretch loading trajectory design and a numerical control code generation method based on an ACB FET series numerically controlled transverse drawing machine. It belongs to the technical field of aviation aircraft manufacturing. (2) Background technology: [0002] Stretch forming (referred to as stretch forming) is the main manufacturing method of aircraft skin parts. The skin stretch loading trajectory refers to the three-dimensional movement path of the stretcher clamp relative to the stretch die. Stretching of aircraft skin is a complex round-turn forming process, and the movement trajectory of the clamp has a direct impact on the quality of the parts. In recent years, domestic aviation manufacturing companies have generally introduced advanced CNC stretch forming machines, which have laid a good hardware environment for improving...

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Problems solved by technology

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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