Aviation wire rope is mainly used to control the rudder, aileron, engine, landing gear, compass needle corrector, etc. of the aircraft. Aviation steel wire ropes have higher performance requirements than ordinary steel wire ropes due to their special use environment, requirements for safety and reliability, and long-term use. For example, the tensile strength is required to reach 1865MPa or more; according to the structure and specifications, fatigue tests are required under different tensions. After the fatigue test, the worn parts should have sufficient strength, that is, the breaking force (see wire rope inspection) shall not be less than 50% of the breaking force specified for the type of wire rope. Aviation wire ropes also require high corrosion resistance. For example, for a jet aircraft flying at an altitude of 10,000 meters, 90% of its flight time is minus 50°C. When it descends under atmospheric conditions, the temperature changes extremely quickly, and dew is often formed on the surface of the wire rope used. In addition, when the brakes are landed, the engine's inverted jet smoke flows through the aileron, auxiliary wing and vertical rudder, and the wire rope used has Strong corrosion and pollution. The types of aviation wire ropes include single-strand wire rope, organic core wire rope and metal core wire rope. Typical structures are 1×7, 1×19, 6×7+IWS, 6×19+IWS, 6×7+NF, 6×19+NF, etc. The raw materials used for aviation steel wire rope are galvanized steel wire and stainless steel wire of carbon structural steel. The coating of galvanized steel wire should be uniform and continuous without cracks and peeling. After passing the inspection, the raw materials are tightly and neatly wound on the spool that meets the requirements in accordance with the process requirements, put into the twisting machine for twisting, and then closing the rope on the rope closing machine. Twisting direction (see wire rope twisting method), except that single-strand rope is left twisted, are all right alternating twists. The rope core is generally made of cotton yarn or hemp and soaked in neutral oil, or a metal core is used. The lay length of the wire rope should be 6 to 8 times the diameter of the rope, and the lay length of the wires in the strands and single-strand wire ropes should not exceed 12 times the strand diameter. The lay length of the strands and the lay length of the steel wire shall be uniform over its entire length. The diameter of the center wire of the strand should be thicker. The twisted rope should be tempered at low temperature with engine oil as the tempering medium to eliminate the twisting stress of the wire rope and further remove the hydrogen in the electro-galvanized steel wire to improve the fatigue resistance and breaking strength of the aviation wire rope.
detail intruduction:
