Pre-twisted Yarn Factory Shaping: The Process Logic Behind Precise Matching

In power transmission line operation, the fit between the fittings and the conductor directly determines the gripping force. As the core component for achieving this function, the size control of the armor rod preformed in production is a technical challenge that the industry continues to tackle. Millimeter-level precision differences can lead to wear or loosening over long-term operation. Before leaving the factory, preformed armour rod is processed into a pre-formed shape that matches the outer diameter of the conductor. This process detail involves a deep coupling between material mechanics and geometric parameters.

Control of the size and pitch of the preformed spiral

The spiral structure of armor rods is not randomly wound. The production line sets the forming mold according to the conductor's nominal diameter, and continuously rolls the monofilaments into a spiral with a constant inner diameter. This inner diameter is slightly smaller than the outer diameter of the conductor, and anchoring is achieved by the radial gripping force generated by the elastic deformation of the armor rods for acsr itself. The key control point in the molding process is the absolute consistency of the pitch. The size of each armor rods transmission line monofilament must be highly uniform, and the ends must be treated as hemispherical or circular. There must be no cracks or scars on the surface.

The Influence of Constant Tension and Heat Treatment on Shaping Accuracy

The core challenge in pre-twisted wire manufacturing lies in the fluctuation of forming tension. Inconsistent tension directly reduces the fit between the pre-twisted wire and the cable, exacerbating wear under micro-vibration. Modern forming equipment uses tension control mechanisms to adjust the drawing speed in real time. Some production lines incorporate constant-temperature heating structures to uniformly heat the pre-twisted wire as it passes through the shaping cylinder, enabling the metal material to achieve a stable crystalline phase structure during the plastic deformation stage. After heat treatment, the pre-twisted wire maintains a stable spatial geometry, allowing it to be directly wound onto the corresponding specification of conductor during on-site installation, relying on material memory properties to restore the preset grip strength.