In terms of the working process, first, insert the rebar to be connected into a special cold extrusion sleeve (the inner wall of the sleeve is provided with grooves to match the rebar ribs). Then, put the extrusion mold over the joint of the rebar and the sleeve. Start the hydraulic pump station; the high - pressure oil (with a pressure of up to 40 - 60MPa) drives the extrusion clamp to act. The mold extrudes along the radial direction of the rebar, making the rebar metal flow into the sleeve grooves and completing the plastic deformation connection. A single extrusion process only takes 5 - 10 seconds, and one set of equipment can connect 300 - 500 joints per day on average, greatly improving construction efficiency.

In terms of performance advantages, first, stable connection quality: The cold - extrusion joint achieves "mechanical interlocking + frictional shear resistance" through metal plastic deformation. Its tensile strength is ≥ the strength of the rebar base material, and the joint performance reaches the Class I standard (complying with Technical Specification for Mechanical Connection of Steel Bars JGJ 107). It is suitable for scenarios with high requirements for connection reliability, such as seismic zones and super high - rise buildings. Second, strong environmental adaptability: No open - flame welding is required, and it is not affected by weather conditions such as rain, snow, and low temperature. It can still operate under complex working conditions such as bridge pile foundations and tunnel underground excavations. Third, energy - saving and environmental protection: It does not generate arc welding fumes, has low noise, and the extrusion molds are made of alloy materials. After surface hardening treatment, a single set of molds can be extruded 800 - 1200 times, reducing consumable costs.

The application scenarios cover fields such as building construction, bridge engineering, and rail transit. For example, in high - rise buildings, it is used for the inter - floor connection of vertical rebars; in the construction of bridge capping beams and piers, it is used for the horizontal or oblique connection of main rebars; in the main structure of subway stations, it is used for the rebar connection of retaining piles and uplift piles. When operating, it should be noted that: regularly check the cleanliness of the hydraulic oil (it is recommended to replace it every 300 hours) and the wear of the molds (if the tooth profile defect is ＞0.2mm, replacement is required). Strictly match the sleeve and mold according to the rebar diameter to ensure that the extrusion is in place (subject to the pressure gauge reading reaching the rated pressure and the mold marking lines being aligned), so as to ensure connection quality and construction safety.