What is CNC machining? What is the basic mechanism of CNC precision machining? What are its main benefits and limitations? If you have just started this job and need to learn about it, do not hesitate to read our article below.
Article table of contents
CNC machining, also known as precision mechanical processing by CNC machines is a mechanical manufacturing process that uses machines that apply computer numerical control technology to create products with high accuracy. It provides high accuracy with fast working speed.
CNC machining is often the final step in the production of metal parts. Or it could be the only process used to create desired mechanical products.
Since the birth of CNC technology, it has brought many great turning points in most fields and constantly improved in line with the trend of globalization.
Each CNC machine has different capabilities and ways of working. However, the machining process of all CNC machines includes the following basic steps:
CAD model design
Designing a CAD model is the first step in the precision machining process
After completing the CAD design, to proceed to machine, designs will be exported to a CNC compatible file format, such as STEP or IGES.
The CAD design file is exported to a CNC-compatible file format through CAM software. This format will generate G-code or M-code digital programming code that controls the CNC machine. Let the CNC machine perform operations, turn on, off, move, cut ... to create details according to the design.
CNC programming is a lot more difficult than setting up and operating a CNC machine. To be able to program requires the programmer to understand the program code. Know how to use CNC code editing software. At the same time, you must be proficient in using one of the processing support software such as Mastercam, NX, Catia ...
Setting up the machine is a rather complicated process. This step should also be performed by experienced engineers. To minimize errors in machining as well as optimize the production process.
At this step, the CNC machine will automatically issue commands to dictate the tool and workpiece actions. Pre-set programs guide the machine throughout the machining process. To perform the necessary actions, create parts or products according to previous requirements.
Follow the general law of development. The advent of CNC technology has rapidly changed the way the entire industry is produced. All operations and machining are automated based on pre-programmed software.
It contributes to reducing the factor of dependence on the technician's technical skills. The resulting product has great accuracy, high uniformity, and a beautiful appearance.
It also meets higher production needs. It is suitable for many different forms of machining, automation, and speeding up production. Thereby it reduces costs, improves quality, and reduces product costs.
Indeed, the revolution of CNC machining technology has completely changed industrial production. CNC machining offers many advantages. When machining on a CNC machine, there are many utilities to mention such as:
Precision mechanical processing is considered a method to produce products with higher smoothness than other methods.
CNC machining technology offers great design freedom. However, not all geometrical parts can be CNC machined. For products with complex geometries to process, it will be very expensive or impossible to manufacture.
Another limitation can be mentioned that CNC machines are not easy to operate. To program the CNC machine requires the operator to have professional knowledge and practical experience.
Referring to precision mechanical processing, we refer to machining methods such as milling, turning, drilling, planning, wire cutting, electric pulse, flat grinding, round grinding, etc.
However, milling and turning are the two most common forms in machining, and precision mechanical processing today. So in fact, when it comes to CNC machining, people immediately think of CNC milling and CNC turning.
In general, CNC milling is often used to perform complex contours on products. It is mainly used to create a complex specification of parts, such as slot, hole, and thread on the workpiece.
CNC wire cutting
EDM CNC wire cutting machining is also known as spark machining. This is a special machining method thanks to the electric spark corrosion of metal. Currently, there are 2 main wire cutting processing methods: molybdenum wire cutting and copper wire cutting.
EMD wire cutting is commonly used to process parts that cannot be machined by laser cutting
In CNC wire cutting machining by spark, the tool and the part are two electrodes. In which the detail is the Anode and the cutting wire acts as the Cathode. The motion of the cutting wire is controlled according to a contour located in the XY coordinate system through the CNC machine table.
Machining parts by wire cutting EDM is a specialized processing method for cutting metal parts with a large thickness of up to 800m. Or used for machining and cutting complex parts with narrow grooves and small holes that laser cutting or other metal cutting methods cannot do.
EMD wire cutting is also very suitable for processing simple parts with small thicknesses by stacking to save machining time and budget…
CNC grinding is a machining method that uses CNC technology to flatten or around the surface of a material.
As the name suggests, CNC grinding machines have the following main functions:
CNC Grinding Machine
The introduction of CNC grinding machines contributed significantly to the development of the field of mechanical processing. Compared with the manual method, the CNC grinding method offers high precision processing.
Thereby improving product quality, developing more sophisticated industrial products limit human errors, shortening production cycles, and speeding up time to market.
Processing a variety of materials can be considered as an important strength of CNC machining. Practically all engineering materials can be machined by CNC machines. But the most popular are still parts processed from metal and plastic.
Commonly used materials in precision mechanical processing include:
Above is all the basic knowledge about CNC machining that anyone pursuing this profession needs to understand. If you have questions or need for mechanical precision, such as CNC milling, CNC turning, grinding, wire cutting CNC ... Machine parts, jigs, molds, and gear ... and mechanical products Main exact request please contact us.
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