I was in the workshop and asked myself what is important when milling aluminum in order to get perfect parts.
So I started researching, rolling through books and searching half the internet. I have summarized everything I could find about aluminum milling in this article.
What should you watch out for when milling aluminum?
It is unethical to “talk about precision without the actual CNC machine tool”. If it is said that “the precision of a five-axis CNC machine tool will definitely be higher than that of a three-axis CNC machine tool”, then it is completely on paper. It is entirely possible that high-end three-axis machine tools have a higher machining accuracy index than ordinary five-axis machine tools.
The 3-axis machine tool contains three linear axes, X, Y, and Z,
Nowadays, automobile molds have higher and higher requirements for mold surface quality and cutting speed. The best milling state can be achieved when the five-axis CNC system is used to process a plane with three-dimensional curves. The setting angle of the tool axis can be changed at any position in the machining area of the machine tool to process different geometric shapes.
5-axis CNC machining method and machine tool. As early as the 1960s, the foreign aviation industry had begun to use it in order to process some large workpieces with continuous smooth and complex free-form surfaces, but it has not been widely used in more industries. Only in the past 10 years has there been rapid development. The main reason is that there are many difficulties in five-axis machining, such as:
Complex contours appear in tool and mold manufacturing, and are mass-produced products. Before the emergence of CNC machine tools, forging dies and dies used in the automotive industry were mainly manufactured by hand. After the 1970s, CNC machine tools have been widely used in tool and mold manufacturing. The basic contours of complex profiles are usually processed by milling, and the surrounding CNC machine tools are initially set to three-axis linkage.
The high-performance 5-axis CNC milling machining center, the CNC system has the space coordinate system rotation and the inclined tool compensation function, which provides the possibility for the machining of some parts that require inclined surface machining and high machining accuracy. When machining on an inclined plane, it is difficult to compile a machining program because the coordinate system changes in space.
Using multiple tools on the machining center machine tool can process all five or six sides of a complex bar workpiece. Its transmission efficiency is significantly higher than that of lathes with additional drive tools. 5-axis milling of bar stock is also economical when machining very small batches of workpieces.
5-axis machining turbocharger impeller
The high-precision turbocharger impeller is the most stringent key component. Through advanced 5-axis machining, hundreds of turbocharger impellers can be manufactured every day. Using solid aluminum milling, compared with the old-fashioned cast supercharger, not only has the price advantage but also higher tolerance accuracy.
Impeller refers to a wheel disc equipped with moving blades. Common materials for impellers include cast iron, bronze, stainless steel, manganese bronze, Monel, INCONEL, and non-metallic materials such as PPS plastic, phenolic resin and so on. .
Machining requirements for impeller:
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