Analysis Of The Whole Process Of Pre-twisted Wire Manufacturing Process

After armor rod preformed twisting is completed, the end is temporarily fixed with flame-retardant tape to prevent preformed armour rod from loosening.
The hot pressing mold is used in the forming stage, and the temperature is set at the critical point of metal recrystallization. The aluminum is heated to 250-300℃, and the steel is heated to 500-550℃. The mold pressure value is calculated based on the cross-sectional area and is usually maintained at 200-300 MPa. The holding time is accurate to seconds, and the cooling adopts the gradient cooling method to avoid internal stress concentration. After the molded part is taken out, it needs to be left to stand for 24 hours to eliminate residual stress.
armor rods surface treatment includes two processes: shot blasting and armor rods for acsr coating. The diameter of the steel shot is 0.8 mm, the projectile speed is 60 m/s, and the processing time is 15 minutes to ensure the surface roughness Ra3.2. The epoxy zinc-based coating is electrostatically sprayed, and the film thickness is detected by the 9-point measurement method, with the lowest point not less than 80 microns. After the coating is cured, a cross-cut test is performed, and the adhesion reaches the level 1 standard.
The armor rods transmission line test items cover physical properties and electrical properties. The tensile testing machine loads at a speed of 10 mm/min, and records armour rod fracture strength and elongation. The resistance test armour rod in transmission line uses the four-terminal method, and the ambient temperature is corrected to the standard value of 20°C. The corrosion resistance test armor rods conductor performs a salt spray test for 96 hours, and the corrosion area does not exceed 5%. 3% of each batch is randomly sampled, and key items are fully inspected.
The packaging is wrapped in layers with moisture-proof kraft paper, and desiccant is placed between the layers. The product number and production date are printed on the outer packaging box, and the inspection certificate is attached to the box. The storage environment maintains a temperature of 10-30°C and a humidity of less than 60%. The stacking height does not exceed 5 layers, and the stacking is turned regularly to prevent deformation. Check the sealing of the packaging before shipment, and the transport vehicle is equipped with a shock-proof bracket.