Soaking fault-prevention selective laser sintering device and manufacturing method thereof

Abstract

The invention discloses a soaking fault-prevention selective laser sintering device and a manufacturing method thereof. The selective laser sintering device is composed of a machine base, a laser scanning device, a printing working cavity, a feeding device and a forming cavity; preheating devices which are uniformly distributed are arranged in an area, which does not affect a laser channel, in theprinting working cavity and located over the position of the forming cavity, and a soaking block is fixed at the position, corresponding to the forming cavity, of the inner surface of the machine base; and a soaking light-transmitting plate which is made of solar ultra-white rolled glass and is 1-2 mm in thickness is suspended in a middle area below the preheating device and above the position ofthe forming cavity, and optical disk grains constructed by a plurality of groups of circular and incomplete circular convex grains with the line width of 180-195 microns, the line height of 5-7 microns and the line spacing of 5 mm are etched on the upper surface of the soaking light-transmitting plate at equal intervals. During 3D printing, preheating is uniform, sintering formability is good, the performance of a sintered finished product is uniform, a sintering fault is avoided, and the structure of the sintered finished product is stable.

Description

technical field [0001] The invention relates to the technical field of chemical composite materials, in particular to a selective laser sintering device for thermal soaking and fault prevention and a manufacturing method thereof. Background technique [0002] Selective laser sintering is the SLS method that uses infrared lasers as energy sources, and most of the modeling materials used are powder materials. During processing, the powder is first preheated to a temperature slightly lower than its melting point, and then the powder is paved under the action of a scraping stick; the laser beam is selectively sintered according to the information of the layered section under computer control, and one layer is completed. Then proceed to the next layer of sintering, remove the excess powder after all sintering, and then you can get a sintered part. Mature process materials are wax powder and plastic powder, and the process of sintering with metal powder or ceramic powder is still...

AI Technical Summary

Problems solved by technology

It is characterized by higher production efficiency, higher operating costs, and more expensive equipment costs

[0003] The pain points of 3D selective laser sintering in the prior art are: 1. The prior art usually uses a fixed thermal radiation source to preheat the powder in the area to be printed. Due to the uneven distance from the heating point, there is obvious uneven heating 1. The problem of poor preheating uniformity of the powder greatly affects the performance and stability of the printed product; 2. When the forming area continues to move down with the printing process, due to the mechanical piston lifting and sintering at the same time Uneven regional heat distribution will inevitably affect or even tear the incompletely solidified sintered area during the movement, resulting in stress concentration in the sintered area and even directly causing delamination fracture

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