Abstract
Polymer products manufactured by additive processes are today increasingly flooding the market. Given that they have broad application ranging from various consumer products to medicine and automotive industry, the products must satisfy certain mechanical properties. In the past studies of selective laser sintering (SLS) for polymer materials, the processing parameter of energy density has been confirmed which affects the tensile properties. Energy density depends on the laser beam speed, laser power and hatch distance; however, in this paper the existing mathematical model has been expanded by the overlay ratio and tests have been conducted how on the basis of the new mathematical model a product with good tensile properties (tensile strength, tensile strength at break, tensile modulus, tensile strain at break) can be manufactured. However, in parameter selection as well, the layer thickness and the manufacturing strategy also play a role, and they may shorten the time and reduce the cost necessary to manufacture a new product from the initial concept to production. The paper also provides a proposal of processing parameters (laser beam speed, laser power and energy density) depending on the manufacturing strategy and layer thickness.
Highlights
With additive manufacturing it is possible to produce parts with complex geometry [1]
Energy density ED is work W accomplished by power P in time t divided by scan spacing
This work W refers to the surface by the diameter of the laser beam and the total distance passed by the laser, i.e., the area where represented by the diameter of the laser beam and the total distance passed by the laser, i.e., laser sinters the product
Summary
With additive manufacturing it is possible to produce parts with complex geometry [1]. SLS is a process used to produce parts from powdered materials using one or more lasers to selectively fuse or melt the particles at the surface, layer upon layer, in an enclosed chamber [1]. In the experiments done by authors Caulfield et al only scan spacing and energy density lower than 0.028 J/mm were used as parameters. They concluded that tensile properties are better if energy density is higher, but maximum energy input to the product without decreasing the tensile properties in not known. Dimensional accuracy, accuracy, shrinkage shrinkage of of part part and and reduction reductionof ofheat heatdeformations deformations[13,21]
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