螺杆和机筒的磨损机理是什么? 常见修复方法说明

这 screw and barrel are critical components of plastic extruders, 它们的状况直接影响产品质量和生产效率. 挤压过程中, 它们在高温高压下运行, which exposes them to continuous friction and mixing with plastic particles. Over time, this leads to different types of wear.

The most common is friction wear. Plastic particles rub against the screw groove and the barrel’s inner wall, gradually removing metal from the surface. Another frequent issue is corrosive wear, which occurs when processing plastics that contain corrosive additives. These chemicals react with the metal surface, accelerating damage.

To address these problems, engineers use a variety of repair and protection methods. Surface coating repair is widely applied: wear-resistant metals or alloys are coated onto the surface, restoring the part and improving hardness and durability. Similarly, surface heat treatments such as nitriding or carbonitriding increase surface hardness and resistance to friction.

For screws and barrels with significant dimensional changes, precision grinding repair can restore original geometry and ensure stable performance in extrusion. In cases of severe or irreversible damage, replacing the entire screw and barrel may be the most reliable solution.

Preventive measures are equally important. Regular inspection, lubrication, and proper operation help reduce wear, extend service life, and minimize unplanned downtime. With systematic maintenance and timely repair, screws and barrels can achieve long-term, stable, and efficient performance in extrusion production.