According to the market research of 3D Science Valley, ceramic 3D printing enterprises focus on the research and development of production-level ceramic 3D printing systems and materials, while 3D printing technologies with lower cost and higher accuracy enter the market. The latest development trend of ceramic additive manufacturing is to enter the manufacturing field of high value-added products, including ceramic 5G antenna, ceramic collimator, nuclear components, ceramic bearings...
Recently, China Mechanical Engineering Society all ceramic bearing series of three group standards officially released.
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Gu's column "The History, Development and Future of Additive Manufacturing Ceramics" discusses seven kinds of 3D printing technologies to make dense and structurally advanced ceramic components from a historical perspective. Many of the challenges of ceramic additive manufacturing, which began more than a decade later than metal and plastic materials, can be traced back to the inherent difficulties of processing structural ceramics, including high processing temperatures, defect-sensitive mechanical properties, and poor processing properties. To mature the field of ceramic additive manufacturing, future r&d should focus on expanding material selection, improving 3D printing and post-processing control, and unique capabilities such as multi-material and hybrid processing. 3 d valley of science
The "joints" of industrial equipment
Bearing is regarded as the "joint" of industrial equipment, its performance directly affects the reliable operation of more than one trillion major equipment in the national economy and national defense field.
All-ceramic bearing refers to high-tech bearing products made of ceramic materials, such as inner/outer ring and rolling body. High-precision all-ceramic bearings have wide demand in domestic CNC machine tools, national defense, aerospace, petrochemical, medical equipment and other high-end equipment technology fields, and their manufacturing level reflects the core competitiveness of national high-end manufacturing.
Localization of ultra-precision all-ceramic bearings for high-end equipment is of great significance for improving the overall level and core competitiveness of domestic industry and equipment manufacturing industry, and promoting the development of domestic high-end equipment to intelligent and green.
Application of all-ceramic bearing in high-end equipment
Engineering ceramic materials used in all-ceramic bearings mainly include silicon nitride (Si3N4), zirconia (ZrO2), silicon carbide (SiC), etc., which have excellent physical and chemical properties that traditional metal materials do not have. The main advantages of all-ceramic bearings made of this kind of material are as follows:
(1) The hardness of engineering ceramic material is much higher than that of ordinary bearing steel, and the service life of all-ceramic bearing of the same type can be increased by more than 30% under the same working conditions;
(2) The thermal deformation coefficient of engineering ceramic material is only 1/4~1/5 of that of bearing steel, and the all-ceramic bearing can show good thermal shock resistance and stable service performance under extreme high temperature, low temperature and large temperature difference working conditions;
(3) engineering ceramic material density, rotational inertia and centrifugal force is small, suitable for ultra-high speed, and strong bearing capacity, good wear resistance, low failure rate;
(4) Engineering ceramics have corrosion resistance, magnetoelectric insulation and other characteristics, and have absolute advantages in working performance under corrosive, strong magnetic field and electrical corrosion conditions.
At present, the ultimate working temperature of all-ceramic bearings has been able to break through 1000℃, the continuous working time can reach more than 50000h, and it has self-lubrication characteristics, and can still ensure the working accuracy and service life under the condition of no lubrication. The structural characteristics of all-ceramic bearings just make up for the defects of metal bearings in engineering applications. They have the characteristics of ultra-high speed, high/low temperature resistance, wear resistance, corrosion resistance, magnetoelectric insulation, oil-free self-lubrication and so on. They are suitable for extremely harsh environments and special working conditions, and have broad application prospects in high-end technical fields.
All ceramic bearing standard
Recently, the Standardization working Committee of The Chinese Mechanical Engineering Society approved the following three standards officially released.
All-ceramic plain bearing Centribular Plain Bearing (T/CMES 04003-2022)
Rolling Bearings all ceramic Cylindrical roller bearings (T/CMES 04004-2022)
"Geometric Specifications and Tolerances for Cylindrical Cylindrical All-ceramic Ball Bearing Products" (T/CMES04005-2022)
The series of standards are organized by the Production Engineering Branch of the Chinese Mechanical Engineering Society, and led by shenyang Jianzhu University (national and local joint engineering laboratory of "high-grade STONE NUMERICAL control Processing Equipment and Technology"). The series of standards will be officially implemented in April 2022.
This series of technical standards specifies the related terms, definitions, specific models, dimensions, tolerance range and clearance standards of all-ceramic joint bearings. Classification, processing technical requirements, matching technical requirements and cutter groove technical requirements of all ceramic cylindrical roller bearings; And the size and geometric characteristics, nominal size limit deviation and tolerance value of cylindrical hole all-ceramic ball bearing, define the working interface of all-ceramic bearing (except chamfering). Based on the series of standards, further standardize the full ceramic bearing design, production, assembly and testing process, ensure the whole quality of the performance of the ceramic bearing, avoid full ceramic bearing in the process of our processing, testing and use unnecessary loss, guide the domestic full ceramic bearing industry healthy and orderly development, promote full ceramic bearing in the process of using security, reliability and economy, It has a profound influence on improving the precision of domestic all-ceramic bearing products.
China Mechanical Engineering Society (CMES) is a national social organization qualified to carry out domestic and international standardization activities. It is one of the work contents of cMES standards to develop cMES standards in order to meet the needs of enterprises and market and promote the innovation and development of machinery industry. Organizations and individuals in China may put forward proposals for the formulation and revision of cMES standards and participate in the relevant work.
The Standardization Working Committee of CMES is composed of 28 well-known experts from domestic colleges and universities, research institutions, enterprises, testing and certification institutions, etc., and 40 professional working groups are responsible for the development of standards.
Post time: Mar-30-2022