What is CNC turning?
CNC Turning is a manufacturing process using of computer numerical control (CNC) in which workpiece are held in a chuck and rotated at a high speed while a cutting tool is fed to the piece to cut away material to create the desired shape. A control center with tooling attached is programmed to remove material to create the programmed result. The common material are metal and plastic. The metal materials includes aluminium, steel, stainless steel, zinc, magnesium, titanium, brass, bronze, copper… And the plastic materials includes ABS、PC、ABS+PC、PP、PS、POM、PMMA、PAGF30、PCGF30、DHPE、HDPE、PPS、PEEK、teflon and so on.
The Adavantages of CNC Turning
At present, the minimum movement (pulse equivalent) of the cutting tool and table controlled by CNC machine generally reach 0.0001mm, and the CNC system can automatically compensate the reverse clearance of the feed chain and the error of the wire pitch, so that the CNC machine tool can achieve high accuracy.
High Production Efficiency
Due to the good structure rigidity of the CNC machine, allow for large cutting amount of strong cutting, the range of spindle speed’s feed is larger than the ordinary machine tools. So during processing we can choose the best cutting amount, to improve the cutting efficiency of the CNC lathe, and save the machine time. The production efficiency of CNC machine tools can be 2-3 times of ordinary machine tools.
Processing single piece and small batch production with CNC machine, because of the high precision, it can reduce the time of adjustment, processing and inspection to save direct production costs. Also, it can save the cost of tooling design and manufacturing. Furthermore, its automatic processing method avoids the manual operation error of the producer, then the size of the same batch of workpiece is with good consistency, high qualified rate and stable quality, so that the production cost is further reduced. Last but not the least, high degree of automation greatly reduce the labor intensity of workers, reduce the number of operators, and facilitate the development of modern management to a more advanced manufacturing system.
The Types of CNC Turning
According to the different applications and structures, lathes are mainly divided into horizontal lathes, vertical lathes, floor lathes, turret lathes, single spindle automatic lathes, multi-spindle automatic, semi-automatic lathes, copying lathes, multi-cutter lathes and various specialized lathes, such as camshaft lathes, crankshaft lathes, wheel lathes, shovel lathes. Among all of these lathes, the horizontal lathe is the most widely used. The machining tolerance grade of horizontal lathe can reach IT8~IT7, and the surface roughness Ra value can reach 1.6μm. Computer technology is widely used in the machine tool manufacturing industry, followed by the emergence of CNC lathes, turning processing centers and other electromechanical integration of products.
The Differences between CNC Turning and Milling
Milling is a more specific process, similar to drilling and cutting. The main function of a CNC milling machine is that your tool will rotate and move while your workpiece usually stays at one position. These machines can be horizontal or vertical, which depends on the workpiece’s tolerance and weight. This process has many axes, allowing a variety of shapes, holes and slots to be cut into the workpiece at many angles. These shafts offer all kinds of maneuvers, either by the spindle or the bed, to cut the part desired to the exact specifications. The workpiece, which in this case appears to be a gear or clutch, is fixed in the bed. Some CNC milling machines are able to move the bed and the spindle to obtain a specific shape at a certain extent. Because of these capabilities, CNC milling provides cutting solutions for more intricate components such as engine components, custom tools, complicated mechanisms and enclosures.
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