With the rapid booming development of new energy automobile industry, the demand for special plastic structural parts, new energy battery accessories, automobile electronic shell parts and lightweight interior parts continues to rise, and higher professional requirements are put forward for hot runner system design, temperature control scheme and supporting thermocouple configuration. Formulating targeted hot runner matching solutions according to material characteristics and product performance requirements of new energy auto parts is the key to ensure product production quality.
Most new energy auto parts adopt modified engineering plastics such as glass fiber reinforced PA, flame-retardant PBT, high-strength PC/ABS alloy and high-temperature resistant PPS. Such materials have high melting point, high melt viscosity, easy wear and easy thermal decomposition characteristics, so the selected hot runner system must adopt high-temperature resistant wear-resistant flow channel design, and be equipped with high-precision high-temperature resistant hot runner thermocouples with stable performance under long-term high temperature. It is necessary to select K-type high-temperature enhanced thermocouples with strong corrosion resistance and anti-aging performance, avoid temperature measurement failure caused by corrosive gas generated by flame-retardant materials, and keep temperature control accuracy stable for a long time.
For large-size new energy automobile interior and exterior decoration parts and battery large plastic shell parts, priority should be given to multi-zone balanced heating large manifold hot runner solutions. Reasonably divide independent temperature control zones, configure enough matched thermocouples to realize partition precise temperature adjustment, ensure uniform melt filling of large-size molds, effectively solve product warpage deformation, shrinkage inconsistency and internal stress excess problems, and meet the strict dimensional tolerance requirements of new energy auto parts. For precision small parts such as new energy vehicle wiring harness connectors and electronic control unit shells, needle valve fine nozzle hot runner scheme is adopted, matched with miniature fast-response thermocouples to realize accurate gate temperature control, ensure product appearance is flawless and dimensional precision is up to standard.
In view of the high flame retardancy, high environmental protection and high safety performance requirements of new energy auto parts, hot runner systems need to adopt smooth dead-angle-free flow channel design, reduce material retention dead angles, and cooperate with accurate thermocouple constant temperature control to avoid long-term local high temperature leading to flame retardant material failure and performance decline. In the production process, stable temperature control can ensure that the mechanical strength, flame retardant grade and weather resistance of finished auto parts meet automobile industry inspection standards, and avoid product performance attenuation caused by improper molding temperature.
Meanwhile, new energy automobile production has the characteristics of fixed mass production models and long-term continuous stable production, so the selected hot runner solution should prioritize products with stable overall performance, mature temperature control system and convenient later maintenance. The supporting thermocouples, heaters and other vulnerable accessories need to select universal standard specifications to facilitate batch replacement and daily maintenance in later mass production. Combine the characteristics of new energy automobile industry of high product standard, strict quality control and stable order volume, match high stability hot runner systems and high-precision temperature measuring accessories, help injection molding enterprises steadily seize new energy automobile supporting market, and realize high-quality and high-efficiency batch production of new energy auto plastic parts.
