The hottest Huahong screw keeps innovating technol

2022-08-13
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Hua Hong screw: continuously innovate technology to manufacture quality screw

injection molding machine is a very important machine in plastic machinery, and the injection system in the injection molding machine is the heart of the injection molding machine: 0471 ⑷ 826452 part. Its function is to ensure that the material is heated and plasticized regularly and quantitatively, and then the molten plastic equivalent to the amount of one injection is injected into the mold cavity at a certain pressure and as soon as possible. After the injection, there is also a pressure holding time to supplement the mold cavity with a part of the molten material that has been adjusted and shrunk due to cooling when leaving the factory, so as to make the products dense and prevent the reverse flow of materials in the mold cavity. Therefore, the injection device must ensure that the plastic is uniformly plasticized and has sufficient injection pressure and pressure holding pressure

the working environment of the screw of the injection molding machine is very bad, and it needs to bear a high injection pressure. In addition, it needs to be started frequently, which requires that the screw material must have: high strength, and the surface of the screw of the injection molding machine is resistant to corrosion and wear, its surface hardness is not lower than hrc58, and the roughness of the working surface of the screw is not lower than ra0.4um. Therefore, high-quality alloy steel (38CrMoAlA) or other alloy steel is generally used to make injection molding machines in China. Comparison of results: multiple experimental characteristic curves can be superimposed, reproduced, amplified and displayed with different colors. The analysis of a group of samples can be compared. 2. The operating steps of the zigzag experimental machine screw or spray the screw surface of the injection molding machine to improve the wear resistance of the screw surface. The screw surface is generally nitrided, sprayed with alloy, chrome plated or titanium plated

Dongguan Huahong plastic machinery factory, as an excellent enterprise established for more than ten years and specializing in the research, development and production of screw barrels, the quality and service of the screw barrels produced are beyond doubt! The screw barrel produced by Dongguan Huahong plastic machinery factory is made of high-quality alloy steel (38CrMoAlA) or chrome molybdenum alloy steel black cross (sacm645) through tempering, shaping, forming, fine grinding, surface nitriding or spray welding alloy (bimetallic), polishing and other processes. It has the advantages of high wear resistance and corrosion resistance. It has professional processing and production lines, advanced technology and unique technology, and introduces advanced professional manufacturing technology from Europe and the United States. In order to serve customers well, our factory provides door-to-door mapping, design and other businesses

I. classification of injection molding machine screws produced by Dongguan Huahong Plastic Machinery Factory: gradual change screw, sudden change screw and general-purpose screw

1. Gradual change screw: refers to the gradual transition of the screw groove depth from the deep screw groove in the feeding section to the screw groove in the homogenization section. It is mainly used for processing non crystalline plastics with wide softening temperature range and high viscosity, such as polyvinyl chloride

2. Mutant screw: refers to the process that the depth of the screw groove changes from deep to shallow, which is completed in a short axial distance. It is mainly used to process crystalline plastics with obvious viscosity and melting point, such as polyethylene, polypropylene, etc

3. General purpose screw: the length of the compression section is between the mutation screw and the gradual change screw, but the plasticization quality and energy consumption are worse than the special ones, so as to meet the requirements of melting and plasticization of crystalline and amorphous plastics

II. Length diameter ratio of injection molding machine screw produced by Dongguan Huahong Plastic Machinery Factory: the length diameter ratio of injection molding machine screw is smaller than that of extrusion screw. The length diameter ratio of injection molding machine screw produced by Dongguan Huahong plastic machinery factory is mostly between, often about 20:1

III. screw compression ratio of injection molding produced by Dongguan Huahong Plastic Machinery Factory: if the screw groove of the homogenization section of the injection molding machine is deep, the compression ratio is small, on the contrary, compression causes the internal and external pressure difference ratio of the sample to be large

the depth of the screw groove is mainly determined by the specific heat capacity, thermal conductivity, stability, viscosity, and pressure during plasticization of the processed plastic. But it should not be too deep. Too deep will make the screw break due to excessive torque, or stop rotating due to overload. Therefore, the compression ratio of injection molding machine screw produced by Dongguan Huahong plastic machinery factory is usually (1..5): 1. The screw with high compression ratio should rotate slowly, while the screw with compression ratio less than 2:1 can work at higher speed

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