Mold working belt optimization (the core)
Mirror-polishing the work belt to completely remove the residual knife lines and burrs from wire cutting; adjust the length of the work belt according to the principle of "fast, slow down, add"; shorten the work belt appropriately in areas where the flow rate is too fast, reduce friction, and reduce aluminum sticking and streaking; make smooth transitions at the entrance and exit of the work belt to avoid edges and corners scratching the aluminum material, and smoothly chamfer the corners to eliminate streaks caused by metal turbulence.
Mold structure and surface strengthening
The shunt bridge and diversion angle are reasonably designed to reduce the eddy current of metal in the mold cavity; the welding chamber is polished to clean the dead corners of aluminum accumulation; the mold is treated with nitriding to improve surface hardness, reduce the adhesion of aluminum liquid, and reduce the repeated scratching of aluminum tumors on the profile to form stripes; after mass production of a certain tonnage, it is returned to the factory for re-polishing and nitriding repair.
Extrusion process adjustment
Control the temperature of the aluminum rod, mold and cylinder reasonably. If the temperature is too high, the aluminum will stick to the aluminum and cause streaks. If the temperature is too low, the friction will increase. Appropriately reduce the extrusion speed to avoid metal tearing and streaking caused by excessive flow speed. Ensure the surface of the aluminum rod is clean, remove oxide scale and oil stains, and prevent impurities from being brought into the mold cavity and scratching the profile.
Production process control
Timely clean up the aluminum nodules attached to the welding chamber and the work belt; ensure smooth discharging and traction to avoid secondary scratches caused by friction between the profile and the discharging table and guide roller; optimize the cooling method to reduce surface lines caused by cooling deformation of the profile.