In terms of equipment structure, a steel bar upsetting machine usually consists of a frame, a hydraulic system, upsetting dies, a positioning device, and a control system. The frame is welded with high-strength section steel to ensure stability during processing; the hydraulic system includes an oil pump, oil cylinder, control valve, etc., which can precisely control the upsetting pressure and stroke; the upsetting dies are customized according to the steel bar diameter, divided into fixed dies and movable dies to ensure the regular shape of the upset section; the positioning device is used to fix the position of the steel bar, ensuring accurate upsetting length (usually 1.2-1.5 times the steel bar diameter); the control system is mostly PLC programming control, supporting automatic feeding, upsetting, and discharging processes. Some high-end models are also equipped with touch screens, which can display parameters such as pressure and stroke in real time, facilitating operation and monitoring.

In terms of application scope, the steel bar upsetting machine can process hot-rolled ribbed steel bars and smooth round steel bars with diameters of 12mm-40mm, compatible with high-strength steel bar materials such as HRB400 and HRB500, and is especially suitable for the upset type straight thread sleeve connection process. Its construction process includes: steel bar straightening → end cutting and flattening → placing into the upsetting machine for positioning → starting the equipment to complete upsetting → checking the upsetting quality (diameter, length, no cracks). Compared with traditional processing methods, its advantages are: first, the cold upsetting process is environmentally friendly, no high-temperature heating is required, avoiding changes in the steel bar material due to heat treatment; second, high processing efficiency, with the upsetting time for a single steel bar being only 10-30 seconds, which can cooperate with the production line to realize batch operations; third, stable quality, ensuring uniform stress on the upset section through hydraulic control, reducing manual operation errors.

Steel bar upsetting machines are widely used in high-rise buildings, bridges, subways and other projects with high requirements for steel bar connection strength. They are important supporting equipment for realizing Class Ⅰ steel bar joints (tensile strength not lower than the base material). Their performance directly affects the reliability of upset type straight thread connections. Therefore, regular detection of die wear and maintenance of the hydraulic system are required to ensure processing accuracy.