How to properly operate the wire extrusion machine
1. After the constant temperature can be turned on, the head and extrusion machine flange bolts should be tightened again before the start of the machine to eliminate the difference between the bolts and the head thermal expansion, the order of tightening the head bolts is to tighten diagonally, the force should be uniform. When tightening the head flange nut, require the same tightness around, otherwise to run material.
2. Start the machine, choose to press the “ready to start” button, and then connect the “start” button, and then slowly rotate the screw speed adjustment knob, screw speed slow start. Then gradually speed up, while adding a small amount of material. Add material to pay close attention to the host ammeter and a variety of indicators to indicate changes in the meter head. Screw torque should not exceed the red mark (generally 65%-75% of the torque table).
3. When the mouth die out of the material evenly and good plasticization can be traction man shaping set. Judgment of the degree of plasticization need to rely on experience, generally according to the appearance of the extruded material to judge, that is, the surface is glossy, no impurities, no foam, scorched material and discoloration, the extruded material extruded by hand to a certain degree of fine does not appear burrs, cracks, a certain degree of elasticity, at this time, the material plasticized well. If the plasticization is not good, you can adjust the screw speed, barrel and head temperature, until the requirements.
4. In the extrusion production process of high-speed extruder, the process parameters should be checked regularly according to the process requirements to see if they are normal, and the process record sheet should be filled in. Check the quality of profile products according to the quality inspection standard, and take measures to solve the problems in time.
5. Stopping
(1) Stop adding material, squeeze out the plastic in the extruder, and when the screw is exposed, turn off the power to the barrel and head and stop heating.
(2) Turn off the power supply of the extruder and auxiliary machine, so that the screw and auxiliary machine stop running.
(3) Open the head coupling flange and disassemble the head. Clean the porous plate and various parts of the head. To prevent damage to the inner surface of the head, the residual material in the head should be cleaned up with steel law and steel pieces, then use sandpaper to grind away the plastic adhering to the head and polish it, and apply machine oil or silicone oil to prevent rust.
(4) screw, barrel cleaning, after removing the head, restart the mainframe, add parking material (or broken material), cleaning the screw, barrel, at this time the screw selected low speed (sr / min or so) to reduce wear. After the parking material is crushed into powder and extruded completely, compressed air can be used to blow out the residual granules and powder from the filling port and exhaust port repeatedly until there is really no residual material in the barrel, then lower the screw speed to zero, stop the extruder, close the total power supply and the total cold water valve. (5) Extrusion should pay attention to the safety items: electricity, heat, mechanical rotation and loading and unloading of bulky parts. Extrusion machine must be equipped with lifting equipment, loading and dismantling the head, screw and other bulky parts to ensure safe production.
