Factors affecting the service life of injection molding machine screws

Factors affecting the service life of injection molding machine screws
The screw barrel is the most critical and important component of an injection molding machine. In injection molding production, the injection screw operates under relatively harsh conditions. It not only needs to withstand the high pressure during injection, but also bears the erosion effect of molten material and frequent load starting during pre molding. During the working process of the screw, torque is required to squeeze and push the plastic particles and their fillers forward, mixing and plasticizing them during the process, and injecting them into the mold cavity through the screw head. The screw barrel can withstand certain high temperatures and pressures of different plastics. The working temperature of injection molding machine screws is generally above 200 ℃
Abrasive wear of screw barrel in injection molding machine
Due to abrasive wear, the gap between the screw barrel and the melt barrel is often too large for normal injection molding. After wear, the gap between the screw and the melt barrel increases, reducing the plasticizing effect, increasing the leakage of the injection, reducing injection efficiency, reducing processing accuracy, causing uneven material temperature and pressure fluctuations, resulting in a decrease in product quality, reduced productivity, and increased energy consumption. In addition, plastic and fillers often decompose into corrosive media during plasticization at high temperatures, which can corrode the metal on the surface of the screw. The corrosion products are easily carried out by the plastic, leading to material loss. The combined effect of wear and corrosion makes it easier for the screw barrel to be damaged and fail.
Jinyang Injection Molding Machine Screw Professional Quality
The main factors that affect the service life of screws are:
(1) Design of screw;
(2) Screw material selection;
(3) Screw manufacturing process;
(4) Material selection and surface treatment of the material barrel;
(5) Low temperature work, impact and overload work, accelerating wear and stress fracture;
(6) Materials (such as plastic particle size and masterbatch performance)
(7) Long term use of high back pressure sol;
(8) Chemical corrosion causes some pits and roughness on the surface after corrosion, which increases the flow resistance of the molten material during the operation of the injection molding machine;
(9) Different degrees of wear caused by impurities mixed in the material;
(10) Improper assembly and debugging of plastic machine accessories;
From this, it can be seen that the design of the screw (i.e. improving the stress state of the screw) and the processed materials, the service life of the screw is mainly related to the material of the screw, the manufacturing process and processing technology of the screw, and the daily usage standards.
Selection of injection molding machine screws
Jinyang Company has first-class professional processing equipment, advanced production processes, and decades of rich experience in the plastic machinery manufacturing industry. Profound research on plastic injection molding and extrusion technology ensures product quality through processing capabilities. According to the different characteristics of engineering plastics used by users, special screws and barrels are designed and manufactured to achieve high-speed and stable injection molding processes, providing complete machine supporting products for multiple domestic brand enterprises.
The Jinyang screw adopts German imported tungsten cobalt based powder alloy (whole alloy), which undergoes a special whole hardening treatment process. The hardness can reach HRC60-68, and it is super wear-resistant, corrosion-resistant, high-speed, high-temperature 600 ℃, and high-pressure resistant.
Scope of application: Adding special, high-temperature, and highly corrosive plastics such as high glass fiber LCP, PPS, PES, PA6T, PPA, PEEK, halogen-free materials, magnetic powder, iron powder, bakelite, etc; And PC, PMMA transparent materials. Forming of light guide plate lenses.