What is CNC Milling Machining?

CNC stands for Computer Number Control (Can be roughly translated as: Numerical control with the assistance of a computer), true to that meaning: The process of precision mechanical machining is performed entirely by algorithms. numbers with complete computer control fulfill human requirements.

The birth of CNC technology marked a major turning point in the revolution of mechanical manufacturing and today it is still developing constantly to bring out the most perfect products. This is also one of the foundations of later technologies, not only limited to the mechanical industry but also expanding to other fields such as: Health, agriculture, fine arts, smart

Milling - turning are two extremely important processing stages of a mechanical processing workshop, so it can be said that milling is one of the methods that both save costs and help ensure the best quality for the machine. product.

CNC milling is no longer something too complicated as before, everything is too easy when applying CNC milling technology to mechanical processing. The simplest CNC milling machine can also meet almost all requirements of the workshop (except for large sizes) from simple to complex in a short time, but achieve higher accuracy that is important. is that it is fully automatic through just a few simple manual operations.

The most important thing in CNC milling is the selection of cutting tools and the appropriate cutting modes for each work piece, workpiece material, the programmer must always pay attention to the tool radius and selling price. the glass of the intersecting angles. Because if used incorrectly, it will greatly affect the details of the product.

The CNC milling machine is capable of cutting a variety of metal materials such as iron, steel, stainless steel, aluminum, titanium... thanks to the intelligent computer system and the diversified cutter system that can move in a straight line, circle, horizontal, vertical, up and down or maybe more advanced than moving in 3D space. The more axes you use your CNC milling machine, the more profiles you will be able to use.
 

Advantages of CNC Milling:

 

• With an ordinary 3-axis CNC machine, you can use it for many different machining purposes such as: milling, drilling, tapping, reaming, boring, etc. with high precision, however it cannot do products with too difficult profiles such as 4D, 5D profiles and suitable CNC machines will be available. Therefore, you can save a lot of costs when using a CNC Milling machine, you can use one machine for many purposes that bring economic benefits to the business.
• Newer CNC machines from famous countries such as Japan, Germany, which are 10 years old, have almost absolute accuracy with tolerances ranging from ±0.01 to ± 0.005, so they can meet many machining needs. especially mold processing. As for the old CNC milling machines, depending on the brand and damage of the machine, the accuracy will vary from ±0.05 to ±0.02. As for other models such as Mitsubishi, Okk, Makino, Moriseik, the accuracy will depend on the use of the knife and programming.

 

Defect:

 

• A disadvantage that can be said to occur in any method of machining workpieces is that the machining surface often leaves traces of the machining tool, or rough surface if the operator chooses the wrong tool when operating the machine. . Therefore, we often have to polish the machined surface after milling.

 

CNC milling process:

Step 1: From the detailed drawing



Step 2: Rebuild detailed drawings




Step 3: Program the machining on CAM




Step 4: Transfer the NC program to the CNC machine




Step 5: Busy operating the processing machine and checking



The CNC milling process begins with the creation of a 2D or 3D CAD part design. The design is then exported to a CNC compatible file format by the CAM software that converts it to an NC machine program. Includes control of machine actions and tool movements on workpieces.

Before the operator runs the CNC program, he or she prepares the CNC milling machine by attaching the workpiece to the machine's work surface (i.e. workbench) or machining fixture (e.g. jig, vise). and install the milling cutter to the main shaft of the machine through the clamps. When ready the operator launches the program through the machine controller.