Chinese Academy of Sciences

Xuechun Lin

Zhiyan Zhang

Jian Xu

Hao Liang

Jinyong Dong

Wenhua Sun

Chuncheng Li

Yongmei Ma

Wenxin Fu

Haijun Yu

Hongyang Wang

Wenhao Ma

Zhiyong Dong

Quansheng Zeng

Houwang Zhu

Yibo Wang

Ning Zhao

Kun Zheng

Jing Guo

Xinyu Cao

Heng Shen

Yannan Liu

Wenting Wang

Shusen Zhao

Haijuan Yu

Tang Zhu

Jingnan Zhang

Fusong Wang

A laser cleaning method and device for improving uniformity of a laser cleaning surface are provided. The laser cleaning method includes: applying a peaked-top sine wave signal to a motor; controlling a galvanometer to swing in a reciprocated manner by the motor; shaping a laser beam emitted by a laser to a linear beam by the reciprocated swing of the galvanometer; and performing laser cleaning using the shaped linear beam.

Laser cleaning method and device for improving uniformity of laser cleaning surface

An acousto-optic Q switch, a resonant cavity, and a pulse laser device for improving laser device power. The acousto-optic Q switch includes: a transparent optical element configured to form a phase grating that diffracts laser; a piezoelectric transducer arranged at one end of the transparent optical element and configured to convert electrical energy into ultrasonic energy to form the phase grating in the transparent optical element; and an absorber arranged at the other end of the transparent optical element to absorb the ultrasonic energy.

Acousto-optic Q switch, resonant cavity and pulse laser device for improving laser device power

This invention relates to a high molecular weight nylon powder composition for 3D printing, its preparation method and use. The composition comprises: 100 parts by weight of high-viscosity nylon powder, 1-5 parts by weight of a flow agent, and 0.1-1 parts by weight of an antioxidant; the high-viscosity nylon powder is one or more selected from nylon 6, nylon 66, nylon 11, nylon 12, nylon 612 and nylon 610; or the powder composition is obtained via polymerization reaction of the raw materials comprising the following components, based on the weight parts of lactam monomers or amide monomers: 100 parts by weight of lactam monomers or amide monomers, 0.005-1 parts by weight of a catalyst, and 0.1-1 parts by weight of an antioxidant. The high molecular weight nylon powder composition prepared in the present invention has a particle diameter in the range of 20-100 micrometers, good powder spreading performance, and is suitable for the 3D printing process, and the product of the high molecular weight nylon powder composition has good mechanical properties, good dimensional stability and low manufacturing cost.

Nylon powder composition for 3D printing, and preparation method and application thereof

A laser cleaning system including a laser source, an energy-transferring optical fiber, a laser cleaning head, a coreless motor, a connection lens barrel, and a mirror.

Laser cleaning system

The present invention provides a composition for 3D printing, a process for preparing the same and an article thereof. By the solidifying method of UV irradiation, 3D printing is implemented. During said implementation, there is no need of high temperature heating, thus energy consumption is reduced, and there is no need for special solvent, thus harm to the environment is reduced. Meanwhile, the present invention uses micro-nano powder as the main material and polymer resin as adhesive, and at the same time, adds irradiation sensitizer. After electron beam irradiation, the polymer resin forms three-dimensional crosslinked network, thereby the strength, heat resistance and chemical resistance are improved after resin adhesion. Additionally, the present invention, by the addition of UV crosslinking agent, and by UV irradiation, cross-links the unsaturated resin after extrusion in 3D printing to form three-dimensional network structure, thus greatly improves the heat resistance, chemical resistance and mechanical strength of the shaping material, and makes the unsaturated resin have broader application prospects in 3D printing material.

Material for 3D printing, process for preparing the same and article thereof

An ultraviolet laser 3D printing device includes a thermostat, a laser head, a non-contact type temperature monitoring device, a scanning galvanometer, a processing platform, a powder laying device, a material to be processed, a computer control system. The device is configured to perform the following functions: presetting a processing temperature by the control system; during the processing procedure, the temperature rise condition of the processed object is monitored by the non-contact type temperature monitoring device and fed back in real time to the control system; and by recording the rise value of the temperature within a certain period, the system can obtain the absorption capability of the laser and the temperature rise degree of the processed material, so that the laser output power can be calculated according to the preset processing temperature value, and the laser power can be adjusted in real time to precisely control the processing temperature.

Ultraviolet laser 3D printing method for precise temperature control of polymer material and device thereof

Growing community of inventors

Beijing, China

Xuechun Lin