Abstract
There is always time and energy optimization and reduction of faults the aim of research and in this context our article presents a study of a practical case of the deformation of a plastic part placed in a refrigerator for food storage, and that the use increases in number of these types of metals, are found in several sectors, and because of their industrial performance, a minimum residence time of the part in the mold is sought in order to reduce the cycle time of the process at the same time that the injection process is quite complex and requires a certain number of recurring questions to succeed. In the desired model. These are linked to residual stresses and deformations, pressure, mold temperature, filling threshold, shape of the part, but also to other mechanical and optical properties. Several investigations have been carried out and according to the authors the causes of these failures vary according to the manufacturing technique used. In this article, we try to find the origin of a deformation detected on a part at the end of the mold. Our work consists first of all in presenting, according to different studies, the thermomechanical properties of the material injected at different stages of the injection process. In a second step, compare the theoretical and analytical results. At the end of our study, we propose an optimization of the parameters necessary for the success of the molding and of the geometry of the assembly (mold and part).
Highlights
Injection molding is a major component of the plastics industry, consuming a large part of the total amount of material [1]
Our study focused on understanding these phenomena through the measurement and modeling of stresses and strains in injected thermoplastic parts: during the plastic and elastic deformation of metal, the mechanical energy produced is partially converted into heat while the rest is stored. strain energy and becomes more important in the case of plastics. [6- 9]
It can be concluded that the important values of the constraints at the ends have an influence on the final quality of our part.The result of the simulation gives a variation in the displacement along the zz axis, at the level of the deformation zone (Figure 5), this variation was detected experimentally
Summary
Injection molding is a major component of the plastics industry, consuming a large part of the total amount of material [1]. The residual stresses inside the parts at the exit of the mold can have two origins: The shear stresses resulting from the flow during filling and compacting does not completely relax at the time of solidification due to the viscoelastic character of the material and normal stresses, which are due to the confinement of the polymer in the cavity linked to the pressure, to the objective, to the fixed stresses induced by the flow. Their effect on molecular orientation, on crystallization, is first-order [11]. The layers being integral, there will be an average expansion and tensile or compressive stresses will appear in the thickness of the part
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