päritolu metall pulber süstimine vormimine

päritolu metall pulber süstimine vormimine

Injection molding was first applied to plastic forming, as early as 1862, Alexander Parkes of England proposed the injection molding method to manufacture plastic combs, umbrella handles, and some other products. The main component of Boshi plastic is nitrocellulose (NC) with a small amount of other substances, which gives it plasticity and other physical properties. In 1869, a British printer, Hytt,

improved Bess plastic to make Celluloid, but still mainly nitrocellulose. In 1878, he injected Celluloid into a multi cavity mold to prepare products. The mold already has a main runner, a splitter and a flex. In 1879, Gray invented the world's first screw extruder in the UK, and during the same period, many other people also designed various models. Celluloid is not suitable for injection molding because of its strong flammability. Until Eichengrumn introduced cellulose alginate (CA) as an injection molding material in 1919, injection molding technology further developed. In 1920, injection molding became an industrial processing method that could process thermoplastic polymers into complex shaped products. The material sheet is the heart of injection molding machines. Hans Gastrovl of Germany invented the material sheet with a splitter shuttle in 1932, which increased the heating area of polymers and overcame the disadvantages of poor thermal conductivity and uneven heating of plastics. However, the splitter shuttle took up a portion of the volume of the material sheet and increased the resistance force, making it more difficult for the melt to inject into the mold cavity. In 1930, the American Celluloid company invented the screw melt injection molding method. In 1940, BASF Company in Germany invented the screw direct injection molding method. The 1970s was an important period of transformation in the development of the entire plastic industry, leading to significant development in injection molding.

The development of metal powder injection molding (MIM) is very eye-catching. Injection molding has been used in the ceramic and plastic industries for many years, but only recently has strict powder been used in the metallurgical industry. Although the market for metal powder injection molding products is still very limited, it has a huge potential market. Injection molding is a forming method that combines molding, hence it is referred to as injection molding. The usual process of injection molding is to place the mixed granular or powder materials into the material barrel of the injection molding machine, undergo heating, thermal shrinkage, shear mixing, and transportation to achieve uniformity and visualization of the material. Then, with the help of a plunger or screw, pressure is applied to the plasticized mixture, and the high-temperature fluid is injected into the pre closed low-temperature mold cavity through the nozzle in front of the material storage and the runner system of the mold. After cooling and shaping, Open the mold, eject the product, and obtain a product with a certain geometric shape and accuracy.