Metal powder injection molding technology materials will continue to improve in the future

In order to meet the continuous development of technical requirements and related specifications of the industry, leading MIM manufacturers must explore the growth space of precision and efficiency of metal powder injection molding technology and equipment. At present, limitations on mechanical and chemical properties and optical appearance of parts are mainly caused by uneven shrinkage in the following aspects: uneven mixture of geometrical deformation powder and raw materials; Density fluctuation caused by injection and degreasing stage; The temperature in the sintering furnace is uneven. Imprecise process gas management for chemical decomposition and color change; The binder is deposited again in the second degreasing process. Residual sintering furnace pollutants. In addition to these technical limitations, a highly competitive market environment shifts cost pressures to component manufacturers. For this reason, in order to push the industry forward, daihom's new materials research has found that higher-yielding, technically sophisticated production equipment and materials are the key.

In addition to the high procurement costs of raw materials (such as fine-grained metal powders, polymer binders and ready-made injection materials), high-temperature sintering is one of the main cost drivers of metal powder injection molding technology. The investment and operation cost of degreasing sintering furnace is the key to the competitiveness of metal powder injection molding parts manufacturers. In addition, according to the specific production situation to choose the appropriate furnace type, is in the metal powder injection molding technology industry to achieve success.

Most sintering furnaces on the market can be divided into periodic vacuum furnaces and continuous atmosphere furnaces without considering customized and highly specialized systems. Both injection molding and catalytic/degreased brown parts contain residual polymers, both of which provide thermal removal solutions. Through practice, dahong new material has found that it is more appropriate to make full use of continuous atmosphere furnace if it is a relatively large part with complete consistency or similar shape in mass production. In this case, short cycle, high sintering capacity, can get a favorable cost return rate. However, in small and medium-sized production lines, the annual output of 150 ~ 200t, high input costs, large volume of continuous atmosphere furnace is not economic. In addition, the continuous atmosphere furnace requires longer downtime in maintenance, reducing the flexibility of production.

If continuous production and low maintenance costs are maintained, MIM experts recommend that critical structural components be protected by a binder collection system for metal powder injection molding technology. Separation of air flow and binder is realized in modern vacuum sintering furnace. A vacuum pump realizes hot zone vacuum extraction, which is composed of roots pump supported by a mechanical pump. The high temperature and high rate process gas carries the saturated and evaporated polymer material and is drawn out through the exhaust pipe at the bottom of the vacuum furnace shell. When the air flow of metal powder injection molding technology is diverted due to the influence of the cold pipe wall, it suddenly slows down and cools, resulting in the instantaneous recondensation of some gaseous binder. In this way, up to 20% ~ 25% of the binder material has been deposited in the pipe, which will lead to pipe blockage.

Above is by large macro small make up about a new material of metal powder injection molding (MIM) technology related content, metal powder injection molding technology of materials in the future will continue to improve, applications will also be more diversified, if you want to learn more about the MIM technology and the related content of MIM material, welcome consulting guangdong big macro new materials metal powder injection molding MIM technology professional team for you to solve!