Layer paving type selective laser sintering fast forming method of linen

Abstract

The invention provides a layer paving type selective laser sintering fast forming method of linen and relates to a selective laser sintering method. The method aims at overcoming the defects that when composite powder is adopted as raw materials of the selective laser sintering, the uniform powder mixing and the mutual adhesion gathering are frequently generated, so the powder paving thickness is not uniform, composite powder loss even occurs in certain point positions, and the relative wrapping rate, the internal stress and the surface roughness of parts are influenced. The method comprises the steps that: 1, a computer is used for building a model; 2, the linen is paved layer by layer, the solidifying liquid is sprayed and coated, and the selective laser sintering is carried out; 3, the step 2 is repeated; and 4, semi-finished products are soaked in toluene, then, the vacuum drying is carried out, next, the semi-finished products are placed into copper ammonia solution to be soaked and are then taken out to be flushed by clean water, the drying is carried out for 1 hour at 120 DEG C, and the layer paving type selective laser sintering is completed. The method is used for preparing processing parts or manufacturing molds through the selective laser sintering.

Description

technical field [0001] The invention relates to a rapid prototyping method of selective laser sintering. Background technique [0002] Selective laser sintering (SLS) is a kind of rapid prototyping. It uses lasers as energy sources. Its working process is as follows: firstly, a three-dimensional solid CAD model of the part is established in the computer, and sliced ​​​​with layered software to obtain each processing level. information and convert it into electrical signals to control the laser scanning system. A thin layer of processing material powder is evenly spread on the worktable, and the laser beam is selectively sintered according to the layered contour of the part under computer control. The processing material powder irradiated by the laser beam is melted and in the subsequent cooling process Bonding together completes the processing of one layer; spreading powder layer by layer, scanning and sintering layer by layer, until the last layer of processing is complete...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of using composite powder as the raw material for selective laser sintering, the mixed powder often occurs unevenly, sticks to each other and aggregates, resulting in uneven thickness of powder coating, and even lack of composite powder at some points, which affects the quality of parts. Relative warpage, internal stress and surface roughness defects, and proposed a linen layer layer selective laser sintering rapid prototyping method