Special Shaped Turned Metal Parts PI Material For Automotive Accessories

Special-Shaped Turned Metal Parts For Automotive Accessories

The core characteristic of PI material is that it is the foundation for achieving high performance in turning parts. Compared with ordinary engineering plastics and even some metals, its performance in key performance dimensions such as high temperature resistance, low temperature resistance, mechanical strength, and insulation brings significant competitive advantages to parts, and can perfectly present the material potential through turning processing, solving the pain points of traditional PI processing difficulty. ​

The temperature resistance range is extremely wide, suitable for extreme working conditions: PI has excellent thermal stability, no obvious melting point, and the thermal decomposition temperature of the fully aromatic PI can reach over 500 ℃. The long-term use temperature range can reach -200~300 ℃, and the instantaneous use temperature can rise to 500 ℃, far exceeding the temperature limit of ordinary engineering plastics and some high-temperature resistant metals. At the same time, its Vicat softening point exceeds 270 ℃, and its load thermal deformation temperature performance is excellent. The parts processed by turning can work stably under extreme temperature conditions such as aerospace high-temperature structural components, electronic equipment high-temperature chambers, chemical high-temperature reaction equipment, etc., without softening, deformation or performance degradation, greatly improving the service life and reliability of the parts, especially suitable for manufacturing core components such as high-temperature self-lubricating bearings, compressor piston rings, and high-temperature seals. ​

Excellent mechanical performance, lightweight and durable: PI has high strength, high modulus, and high fracture toughness. The tensile strength of unfilled PI plastic can reach over 100MPa, the tensile strength of homopolymer PI film can reach 170MPa, the tensile strength of biphenyl PI can reach 400MPa, and the elastic modulus is usually 3-4GPa. Its fatigue resistance and impact resistance are outstanding. The impact strength of thermoplastic PI is as high as 261kJ/m ², which is comparable to high-quality alloy materials. At the same time, its density is only 1.38~1.43g/cm ³, far lower than that of metal materials. Parts made by turning processing can meet the strict requirements for structural strength and rigidity of parts in aerospace, precision electronics and other fields, while significantly reducing part weight, assisting in equipment lightweighting upgrades, and reducing energy consumption and operating loads. In addition, the toughness of PI is further improved after modification treatment, and defects such as edge breakage and fracture are less likely to occur during turning processing, which can stably ensure the forming quality of parts and reduce the scrap rate.

Corrosion resistant, radiation resistant, self-lubricating, reducing maintenance costs: PI has extremely strong chemical resistance, most varieties are insoluble in organic solvents, stable to dilute acids, and can achieve excellent hydrolysis resistance after structural modification. It can withstand boiling at 120 ℃ for 500 hours and resist corrosion from chemical media, acid-base solutions, fuel lubricants, etc., avoiding damage and leakage of parts due to corrosion and extending the maintenance cycle of parts. At the same time, PI itself has excellent tribological properties, low friction coefficient, outstanding resistance to sliding wear and micro motion wear, and further improved wear resistance after graphite and carbon fiber modification. The machined parts can achieve self-lubricating without the need for additional lubricants, reducing friction losses during operation and lowering overall maintenance costs of the equipment. It is suitable for manufacturing wear-resistant components such as bearings, guide rings, and sealing rings. In addition, PI has excellent radiation resistance, with a strength retention rate of 90% after 5 × 10 ⁹ rad fast electron irradiation, making it suitable for special irradiation scenarios such as nuclear industry and aerospace.

Good dimensional stability, suitable for precision requirements: PI belongs to crystalline polymer materials with a small linear expansion coefficient, ranging from 2 × 10 ⁻⁵~3 × 10 ⁻⁵/℃. Biphenyl PI can reach 10 ⁻⁶/℃, and some varieties can reach 10 ⁻⁷/℃, which is very close to some metal materials. It also has excellent thermal stability and is not easily deformed or shrunk due to temperature changes and uneven stress during turning and subsequent use. The dimensional accuracy is highly controllable. This feature is highly compatible with the precision of turning machining, which can easily achieve high-precision machining requirements of parts, meet the strict standards of precision electronic, aerospace, hydraulic control and other systems for part size tolerances, ensure the compatibility of part assembly and the stability of operation, avoid the impact of size deviation on the overall work efficiency of the system, and is particularly suitable for manufacturing micro precision valve cores, electronic packaging and other fine parts.