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Precise temperature control system for 3D printing of high-molecular material by picosecond laser

A 3D printing and picosecond laser technology, applied in the field of laser 3D printing, can solve problems such as poor temperature control, warping and decomposition, and achieve the effects of short pulse time, high peak power and high single pulse energy

Active Publication Date: 2014-08-13
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the phenomenon of warping and decomposition caused by poor temperature control in 3D printing due to the sensitive response of polymer materials in the background technology

Method used

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  • Precise temperature control system for 3D printing of high-molecular material by picosecond laser
  • Precise temperature control system for 3D printing of high-molecular material by picosecond laser

Examples

Experimental program
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Embodiment 1

[0032] application figure 1 The picosecond laser precise temperature control 3D printing polymer material system shown in this example takes picosecond laser 3D printing nylon 66 (polyamide 66) 1mm thick strip material as an example, and its processing temperature range is 270-290°C. The thermal decomposition temperature is greater than 350°C. The most stable processing temperature is around 280°C. The picosecond laser 21 used is a fiber laser with an output wavelength of 1064 nm, a pulse width of 30 ps, ​​a repetition rate of 50 MHz, an average power continuously adjustable between 0 and 100 W, and a focused spot diameter of 250 μm. The vibrating mirror 22 is a high-speed vibrating mirror, and the set scanning speed is 0.2 m / s. Through the laser controller 33, it is set to continuously print small grids of 2*3mm on the long-sized nylon material, but the nylon 66 material is not pierced. Both infrared thermometers use IRT-1200D fast infrared thermometer, the temperature mea...

Embodiment 2

[0035] application figure 1 As shown in the picosecond laser precise temperature control 3D printing polymer material system, this embodiment uses picosecond laser 3D printing polypropylene (PP) thermoplastic resin material. The PP material in its strip shape Φ5 is 3D printed and processed into regular particles. Because PP material has a large shrinkage rate (1% to 2.5%), it is easy to form depressions on the surface of thicker products. With general nanosecond or continuous light lasers, it is easy to accumulate heat on the surface of the material, and the depression phenomenon is difficult to eliminate. Therefore, the use of high-repetition-frequency picosecond laser 3D printing PP materials can be rapidly prototyped, and there is almost no heat accumulation on the surface of the material, which overcomes the phenomenon of surface depressions.

[0036] The picosecond laser 21 used is a fiber laser with an output wavelength of 1064 nm, a pulse width of 10 ps, ​​a repetition...

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Abstract

The invention provides a system for realizing 3D printing of a high-molecular material by a picosecond laser. The system comprises a laser system, a control system, an infrared temperature measuring device and a feeding device. Temperature difference with the latest 3D printing job temperature is compensated through calibration, feedback and laser power control. The temperature difference can be accurately controlled within + / - 0.5 DEG C. The high-molecular material can be effectively prevented from warping and nonuniform processing phenomena during 3D printing process.

Description

technical field [0001] The invention relates to the field of laser 3D printing, in particular to a system for 3D printing polymer materials using picosecond lasers. Background technique [0002] 3D printing technology is a new technology of laser rapid prototyping, a leap in laser application, and even known as the third industrial revolution. Laser 3D printing uses light-curing rapid prototyping technology to quickly print liquid or powder materials into originally designed objects. It integrates laser, machinery, control system. Materials currently available for laser 3D printing have covered polymers, metal powders, ceramics and their composites. Compared with metal and ceramic materials, polymer materials have lower surface energy, higher melt viscosity, lower forming temperature, lower laser power required, and no "balls" that appear during metal powder printing. transformation" effect. Therefore, polymer materials are most widely used in the field of SLS (SLS: Sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/00
Inventor 林学春孙伟张志研赵树森于海娟马永梅孙文华徐坚董金勇李春成符文鑫
Owner INST OF CHEM CHINESE ACAD OF SCI
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