Extrusion Die Maintenance and Usage Methods
Extrusion dies operate under high temperature, high pressure, and high-intensity friction, which leads to a relatively short service life. Understanding failure modes and implementing proper maintenance can significantly extend die life.
Main Failure Modes of Extrusion Dies
1. Wear Failure
During the profile extrusion process, the profile comes into direct contact with the working belt under high temperature and pressure, generating strong friction. This causes wear to the cavity surface and the working belt surface, leading to failure.
2. Cracking Failure
After a certain service period, small cracks will appear in the weaker parts of the die. As production continues, the cracks gradually expand in depth. When they reach a certain extent, cracking or fracture will occur.
3. Deformation Failure
This generally refers to the situation where the cantilever of the die becomes eccentric or sinks during use. It may be caused by insufficient strength or other reasons.
Extrusion Die Maintenance
The first problem to be solved in extrusion die maintenance is the problem of inconsistent discharge length of extruded profiles. During the repair process, try not to modify the working belt or perform welding as much as possible. It is best to achieve a good repair by adjusting the flow of the guide plate or the welding chamber, which can better maintain the stability of the die.
Efficient cleaning of extrusion dies is quite necessary, as there are many corners and tiny areas that are difficult to polish and grind manually. Using a polishing sandblasting machine to clean the surface of the dies is highly recommended.
Usage and Maintenance Specifications
- Nitriding treatment: After the die passes the quality inspection, nitriding treatment should be carried out immediately to strengthen the surface, so that the die can better cope with production.
- Avoid frequent die mounting and dismounting: During the production process, try to avoid frequent mounting and dismounting of the die as much as possible, to reduce the decline in the comprehensive performance of the die caused by sudden cooling and sudden heating.
- Later-stage maintenance: Later-stage maintenance and upkeep of the die is also very important. Before the die is stored in the warehouse, it must be cleaned thoroughly and sprayed with anti-rust agent.
Design and Manufacturing Considerations
- For the design of multi-hole dies, great attention must be paid to the layout of portholes. Since there are many bridges, it is necessary to arrange them reasonably to achieve perfect pressure relief.
- During the manufacturing process, special attention should be paid to weak parts and stress concentration points.
Conclusion
Appropriately improving the life of multi-hole dies is a comprehensive systematic project, which can only be realized by implementing a comprehensive die tracking and management control system. The final success of extrusion dies depends on a complete set of links. Neglect of any link will make it impossible to maximize the efficiency of the extrusion die.
