A preheating cylinder for high-temperature laser selective sintering and its forming method

Abstract

The invention belongs to the related field of advanced manufacturing technology, and discloses a pre-heating cylinder body used for high-temperature laser area selective sintering. In the thickness direction of a cylinder body, the cylinder body comprises an anisotropy heat conduction layer, a ceramic unit temperature control element, a carbon fiber supporting pad, a ceramic heat insulation heat preservation plate and a heating power protection layer from inside to outside, and specific structures and arrangement manners of components are further subjected to optimized design. The invention further discloses a corresponding forming method. Through the method, the longitudinal heating area is selectively controlled, powder, with a certain thickness, to be fed only needs to be preheated to be within the sintered window range, lower mostly-stored powder is subjected to gradient preheating, the temperature is reduced layer by layer, distribution type uniform control over the temperature ofthe pre-heating cylinder body is achieved, and dissipation of redundant heat is reduced while the preheating efficiency is improved. In addition, 400 DEG C high-temperature preheating of the laser sintering temperature field can be effectively achieved, and the pre-heating cylinder body is particularly suitable for SLS machining forming application occasions of high-melting-point polymer like PEEK parts.

Description

technical field [0001] The invention belongs to the related field of advanced manufacturing technology, and more specifically relates to a preheating cylinder for high-temperature laser selective sintering and a forming method thereof. Background technique [0002] Selective Laser Sintering (SLS) is an industrial-grade high-efficiency additive manufacturing (3D printing) technology with great application potential. SLS uses low-power CO 2 The forming process characteristics of laser melting powder materials determine that SLS is mainly used in the forming and manufacturing of thermoplastic polymers (mainly polystyrene (PS), polyamide (PA), polypropylene (PP), etc.) and their composite materials. It is one of the most promising additive manufacturing technologies to quickly manufacture complex-shaped plastic functional parts or casting wax models without fixtures or molds. [0003] However, due to the limitation of equipment level and forming process, SLS technology at home ...

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Problems solved by technology

[0004] The SLS equipment in the prior art usually uses infrared radiation heating tubes to heat the forming table. This method of pure infrared radiation heating is difficult to reach a high temperature of 400 ° C. Therefore, it is urgent to develop another stable and controllable heating method to achieve such as PEEK High-temperature laser selective sintering requirements for high-performance special polymer materials, especially to meet the uniform preheating requirements under harsh process conditions

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