How to calculate the maximum number of uses and the lifespan of aluminum extrusion dies

A good set of molds, besides ensuring the machining of mold components, must also have proper assembly. If adjustments during assembly are not done correctly, it can cause uneven clearance between the punches, accelerate mold wear, and produce defective products. There is no specific standard for the maximum number of uses for aluminum extrusion molds, but the following points can generally be referred to:

1) The quality of the steel used for the dies,

2) The design of the extrusion dies and die manufacturing technology,

3) Whether the maintenance of the extrusion dies is adequate,

4) Whether the aluminum profile extrusion production process technology is reliable,

5) Whether the management of the extrusion dies is proper.

If all five of these points are optimized, an aluminum extrusion die can be used for over a million cycles without any problem. These five requirements are not only related to the die's lifespan, but they also need to be addressed sequentially from 1) to 5) to ensure each aspect is properly linked.

Designing mold structure to determine the number of uses and lifespan of the mold

1) It is unavoidable that there are recessed corners in the overall mold. When the corner radius is less than 2 mm, or in recessed corners of deep and narrow cavities, or when tool marks are left on recessed corners during processing, stress concentration is likely to occur, which can lead to cracking.

2) Within the tolerance range of the blank, to reduce the ejection force of the blank and shorten the time the blank stays in the mold cavity, the mold should be properly tapered. For example, for bell-shaped shell products, the upper end of the same diameter on the head is about 0.1 mm larger than the lower end. For the rod section, the upper end diameter at the same diameter is about 0.4 mm larger than the lower end. This reduces the ejection force and minimizes scratches on the die surface. Reverse taper, or undercut, is strictly prohibited, as it will lower the blank quality, reduce mold lifespan, and may even cause material jamming, resulting in mold damage.

3) The guiding device of the mold is also very important. It ensures the relative positional accuracy of mold parts during operation, prevents uneven mold wear, and a reliable guiding structure is beneficial in avoiding damage between the male and female dies. It is especially important for molds with small clearances. Otherwise, uneven load can cause premature mold failure.

4) Reasonable clearance between the male and female molds not only effectively improves product quality but also affects the mold's lifespan to some extent. If the clearance is too small, die wear occurs; if it is too large, it not only impacts the product's coaxiality but can also cause bending of the male die due to uneven load, affecting its lifespan.

5) The machining accuracy of the mold depends on the final polishing process in the mold manufacturing. The quality of polishing directly affects the service life of the mold and also impacts the surface finish and dimensional accuracy of the finished product.

6) Reasonable assembly, adjustment, and management.