Research Of Forming Technology On Integration Of Structure And Performance Of Thin-walled Support Of Polyurethane Elastomer

Casting polyurethane elastomer is widely used in the field of support and cushioning, due to its perfect performance in the mechanical properties, resilience properties, the ability to adapt to the environment and the ability to adjust for different requirements. To meet the needs of a new type of cylindrical device for supporting and damping, this paper studied the the influence of the size of pre-bending structure and the different properties of materials, for maintaining its normal position and posture state while working. The polyurethane elastomer was selected as the material and the pre-bending support rib structure was studied in this paper. Therefore, this research is conducted from the following several aspects:the selection of the material, the analysis of the compression performance of the support in different sizes and in different materials, the production and the performance test of the qualified arc-shaped support.Firstly, based on the reaction between the raw materials of polyurethane elastomers, the basic reaction principle and the molding characteristics of the materials were studied. The tensile properties and the tear properties were tested base on National Standards, as a result the materials of hardness (Shore A) of40,55,60and85were selected for the later study.Secondly, the material property constants of the elastomer of hardness (Shore A) of85were calculated based on the Mooney-Rivlin model. And the thickness of the rib and the angle of the pre-bending body is selected as the single variable in the support structure designed. The compression performances of supports of different sizes were simulated by the finite element analysis software (ABAQUS). Then the result of the simulation was processed using the data analysis software (Matlab) to explore the law of the support performance of the pre-bending structure by the influence of the size changes.Then referring to the size parameters (α=13°, b=3mm) in which the platform effect of the compression performance is better than others by the result of the simulation analysis, the flat mold was designed and produced, using which the elastomer panel support of hardness of85(shore A) was casted. Then compared the result of the detection of the support compression performance on the test platform with the simulation result data, the reliability of the simulation analysis could be verified. Then the other3kinds of materials supports was casted, and the influence of the hardness of the materials on the compression performance of the pre-bending support was studied.Finally, based on the result of the research about the influence of the different sizes and the different materials on the compression performance, the arc-support mold was designed and produced with the ribs thickness of3millimeters and the pre-bending angle of13°, and the material of hardness (Shore A) of55was selected as the casting material. The result of the compression test showed that the support performance of this kind of size and material was qualified, and the platform effect is apparent in the compressive curve, and also the starting supporting force and the amount of compression and the width of the platform are in line with the expectation, which can meet the needs of the cylindrical equipment well.