Temperature compensation method for composite material workpiece autoclave forming workpiece

Abstract

The invention discloses a temperature compensation method for a composite material workpiece autoclave forming workpiece, which utilizes heaters for heating the low-temperature parts of the workpiece to realize temperature compensation and includes steps: simplifying an autoclave model, conducting meshing and simulating the workpiece temperature field in the forming process of the composite material workpiece autoclave by temperature field simulation software; determining the positions of maximum temperature value point and each minimum temperature value point; determining the number and the positions of the heaters; determining the temperature difference value between the maximum temperature value point and each minimum temperature value point; determining the function of heat release rate of each heater; introducing the function of heat release rate of each heater into a three-dimensional heat conduction equation, and conducting analog computation, thus obtaining the optimized temperature field; if the optimized temperature field still can not meet requirements, repeating the last steps until the temperature field of the workpiece meets the requirements. The method can control the temperature difference of the workpiece, ensure the uniformity of the temperature field and lower the production cost.

Description

technical field [0001] The invention belongs to the technical field of autoclave molding of composite materials, and in particular relates to a method for compensating the temperature of parts in the molding process of autoclave of composite materials. Background technique [0002] Carbon fiber reinforced resin-based composites have been widely used in the aviation industry due to their high specific strength, high specific stiffness, corrosion resistance, and designability, and their usage has become one of the signs of aircraft advancement. At present, domestic aviation companies mainly use the autoclave forming process to manufacture composite components. In the autoclave molding process of composite material parts, there is a high requirement for the uniformity of the temperature field of the part. If the temperature difference of the part is too large, it will lead to a series of problems such as uneven curing of the composite material part and deformation of the part. ...

AI Technical Summary

Problems solved by technology

However, this method reduces production efficiency and increases production costs. It requires strong experience to guide, and for those tooling with complex structures, it often cannot meet the production requirements; in addition, the tooling structure can be optimized to control the workpiece. However, for tooling with a relatively complex structure, the heating rate of some parts of the part is still very low, resulting in a low temperature at this position and a large temperature difference of the part. The optimized result cannot meet the production requirements

Images