Continuous extrusion copper bar surface hardness adjusting method

The invention relates to the technical field of copper bar production, and discloses a continuous extrusion copper bar surface hardness adjusting method which comprises the following steps: manufacturing a copper plate into a copper rod by using an up-drawing continuous casting method; extruding the copper rod by a continuous extruder to form a copper bar; a cooling water tank is used for cooling the extruded copper bar, a cooling cylinder is connected between the cooling water tank and an outlet of the continuous extruder, the cooling cylinder is inclined by 2 degrees, the lower end of the cooling cylinder extends into the cooling water tank, cooling water with the temperature of 40-45 DEG C is circulated in the cooling water tank, and the copper bar extruded from the continuous extruder penetrates through the cooling cylinder and enters the cooling water tank; and sawing into sections, polishing and grinding. The copper bar produced through continuous extrusion can obtain enough surface hardness without dra