During the process of failure mode, it may failure in the early stage for the reason of mold’s impact, plastic deformation, adherency and the phenomenon of abrading, bending, and neck-down. But the main failure of extruded aluminum behaves in three kinds of normal ways: abrading, crack and deformation. 1. The process of the extruding of aluminum is produced by high-temperature extruded material which is not lubricated touching the mold’s open point, and one side touch the surface of calibrating straight, and the other side slides which will produce friction on the surface of cavity and calibrating straight in order to make the extruded aluminum cases failure. At the same time, mold’s surface is adhered to some blank metals which change the geometrical shape of mold. This is also a kind of failure, and is a kind of wear-out failure. 2. Cracking failure. The cracks are distributed in some parts of mold, and during some service periods, it will produce some tiny crackles and widen in the lengthways to a specific size. 3. Deformation failure refers to cantilever eccentric and undercut. The main reason is that the material strength is not strong enough.
Main measures to improve the life of extruded aluminum mold
There are many factors affecting the life of extruded aluminum, and these factors are not independent but complicated and multi-factored problems. In the first place, designing an appropriate mold is the most important part to improve it working life. The correct designed mold structure should be guaranteed not to be damaged or concentrated on stress. Therefore, we should make every part bear the well-distributed force and avoid the closed angle, concave angle and so on. Secondly, we should pay attention to the correct selection of mold material.For the extruded electronic enclosures works under the high temperature, and bears the function of cyclic loading while the work condition is in low quality, so the high requirements are needed in selecting of die steel. Thirdly, improve the quality of heat treatment and surface treatment, and the working life largely depends on the quality of heat treatment. Last but not the least, improving the condition of extrusion process plays an important role in improving mold’s working life.
Conclusion
In the process of produce and work, the working life of extrude mold is a complicated problem, besides the above method, the appropriate use and maintenance are also important to extrude mold’s working life.
The article is come from:http://www.perfiles-de-aluminio.info/aluminium-profile/methods-to-improve-the-life-of-extruded-aluminum.htm