Accurate machining method for complex thin-wall variable-thickness large covering cap

Abstract

The invention discloses an accurate machining method for a complex thin-wall variable-thickness large covering cap. The accurate machining method for the complex thin-wall variable-thickness large covering cap comprises the following steps: simulating and flattening according to the geometrical parameters of the large covering cap, and calculating the smallest blank; designing and producing a concave-convex fixture die needed for hot-pressing forming according to the specific structure and dimensions of the large covering cap; carrying out the hot-pressing forming on the large covering cap bymeans of die-assembly hot-pressing forming; carrying out corrosion machining on a weight-reducing cavity in the internal profile of the large covering cap by means of chemical milling; designing and producing a follow-up fixture needed for machining for the large covering cap according to the specific structure and dimensions of the large covering cap; clamping and fixing the large covering cap through the follow-up fixture, filling a gap between the large covering cap and the fixture by virtue of solid paraffin, and integrally bonding the large covering cap with the fixture; and carrying outfinish machining forming on the large covering cap through a five-axis numerically-controlled machining center. According to the accurate machining method for the complex thin-wall variable-thicknesslarge covering cap, the vibration and deformation of a large-dimension thin-wall part in the machining process are effectively controlled and reduced, and the profile and dimension accuracy of the large covering cap are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of machinery and sheet metal processing, and in particular relates to a precise processing method for a complex thin-walled variable-thickness large mouth cover. Background technique [0002] At present, in the field of aerospace, as various types of aircraft and projectiles have higher and higher requirements for maneuverability and load capacity, their structures also put forward higher requirements for lightweight and high strength. More and more parts are used in the aerospace field, such as aircraft wings, fuselage panels, variable thickness skins, etc. However, due to the large size, thin wall, variable thickness and many other difficulties of this type of parts, the parts vibrate significantly and deform greatly during the processing process, and the size and surface accuracy are not easy to guarantee. Promote apps. [0003] At present, in the manufacturing process of this kind of parts, some featur...

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Problems solved by technology

[0004] The present invention is aimed at the existing complex thin-wall variable-thickness large mouth cover. Due to its large size and thin wall thickness, the problem of obvious vibration and large deformation during the processing of parts provides a complex thin-walled cover. The precise processing method of the variable-thickness cap can effectively solve the problem of obvious vibration and large deformation of the thin-walled cap during the processing process, and further improve the size and surface accuracy of the cap

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