Temperature Field Analysis And Structure Optimization Of Hot Pressing Tank Mould For Composite Components

Composites are composed of matrix and reinforcement materials in a specific arrangement,which has certain performance advantages,so they have broad application prospects,especially in the field of aerospace.In order to make the amount of composite components break through a new height,higher requirements are put forward for its forming technology.Autoclave process has the advantage of stable forming quality,and is one of the main forming methods at present.When forming,the mold is the carrier in direct contact with the composite material,and the temperature distribution on the mold surface directly determines the forming quality of the composite component.Therefore,based on the mold surface temperature field,this paper explores the influence law of environmental parameters,obtains a reasonable process curve,optimizes the mold structure,improves the uniformity of temperature distribution,and then obtains highquality composite wing panels.Firstly,the working principle of the autoclave is analyzed,and the mathematical model that can describe the heat transfer process in the autoclave is clear.The temperature field simulation model used to simulate the forming of composite autoclave is established by COMSOL.The example analysis shows that the error of the model is less than 6%.Using the model for example analysis,the temperature distribution nephogram of the die surface of the wing panel is obtained,and the distribution characteristics of "temperature lag zone" in the middle and rear of the die panel are analyzed.According to this characteristic,it is pointed out that increasing the temperature change rate here is the key to solve the problem of uneven temperature distribution.Secondly,based on the mold temperature field and taking the temperature variance as the index,the influence law of high-sensitivity environmental parameters on the mold temperature field is explored.The results show that there is interaction between environmental parameters.Therefore,the orthogonal test method which can solve the problem of multi factor crosslinking is selected to optimize the environmental parameters and obtain a more reasonable process curve.Under the condition of the new process curve,the maximum temperature variance is reduced by 56.73%,the curing time is shortened by 18%,and the energy is saved by 23%.In addition,based on the theories of fluid dynamics and Newton’s heat dissipation equation,an optimization method of "adding a deflector inclined at a certain angle along the fluid flow direction in the die support structure" is proposed.It is determined that the best shape of the deflector is a plane straight plate and the assembly angle is 10 °.At this time,the maximum temperature difference on the mold surface decreases by 65.7%.Finally,the internal mechanism of curing of resin matrix composites is studied.Aiming at the curing process of resin matrix composites,a curing simulation system coupled by multiple physical fields is established,and then the changes of curing degree after the improvement of mold structure are compared and analyzed.It is concluded that the curing of each part of the resin is more synchronous,and the maximum curing degree variance decreases by about 58%,which verifies the rationality of the optimized structure and the feasibility of the optimization method in this paper.