1, the injection molding machine screw, preferably a screw barrel, screw causes of damage
① plastics raw materials when the temperature is low.
② raw mixed metal objects or raw material impurities.
③ screw idling too long.
④ the manufacturing screw material selection unreasonable.
⑤ Screw manufacturing precision, low thread Face heat treatment hardness.
2, injection molding machine injection screw, preferably a screw barrel, screw manufacturers disassembly sequence
Removing the screw should use a special tool, and not use a hammer, concrete removal procedure is as follows.
① disassemble the connector nozzle and nozzle and barrel between.
② the screw at the rear linkage separated from the drive shaft.
③ disassembly flanges, toggle screw forward.
④ When the screw head when the barrel is exposed, immediately dismantle the screw head connecting thread (Note: This is generally the majority of left-handed thread).
⑤ disassembly check ring and seal ring on the screw.
⑥ dismantled nozzle check ring, sealing ring and screw, immediately hot copper brush, shovel type tool to clean all parts of the remnant. Special difficult to clean sticky material should be placed in an oven heated to make the material softening temperature of the lowest temperature, and then remove the residual material.
⑦ put the parts on the assembly screw together, each threaded joints to be coated molybdenum disulfide grease resistant, to facilitate the next disassembly.
Screw ⑧ not used after the surface cleaning to be coated protective oil, wrap, hung in the air a safe place.
3, injection molding machine screw, preferably a screw barrel, screw the manufacturer's repair and replacement
Face screw ① If there is slight wear or scratch marks, available whetstone or fine emery cloth grinding, repair photodamage site.
Work surface ② screw serious wear and tear, scar deep ditch, you should check the screw Wear analysis, troubleshooting, in order to avoid a similar phenomenon again, and then deep scars ditch repair welding repair. If the entire screw thread badly worn, with the gap screw and barrel increases, the leakage current is increased melt occurs at work, unstable injection amount, the screw thread cylindrical thermal spraying should wear-resistant alloy, and then barrel The actual size of the inner diameter, according to the part with clearance requirements (look-up table 3-3) were screw grinding.
      If the cylinder wear serious, after the repair the hole diameter increases, after spraying the screw grinding has been unable to meet the barrel and screw with the gap size requirements, the screw should be re-manufactured. Screw thread diameter machining, it should be based on twenty fitting clearance requirements, refer to the actual cylinder bore diameter machining.