Hard-wired DNC versions are also substituted with wireless DNC. This kind of control is highly common in industries like the automobile, appliance, and aerospace sectors that involve a lot of sheet metal manufacturing. The computer may deliver applications to many computers as needed if it is connected to several machines. Typically, the control’s manufacturer offers appropriate DNC software.
Well, in this reading, I’ll be exploring what direct numerical control is, its functions, diagram, types, advantages, disadvantages, and how it works.
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What Is Direct Numerical Control?
Direct numerical control (DNC), also known as distributed numerical control (also DNC), is a common manufacturing term for networking CNC machine tools. When milling complicated surfaces, for example, the available memory on some CNC machine controllers is insufficient to hold the machining program. In these situations, the program is saved on a different computer and delivered, block by block, straight to the machine. If this clause is unfeasible, several software providers offer DNC apps that serve the same function. It is usually necessary to have DNC networking or DNC communication when using CAM applications with CNC machine controls.
A central computer is responsible for inputting and editing programs for all connected machines, combining CAD with CAM. It provides a link between the central computer and plant computers connected through a network, enabling on-demand delivery of stored programs. DNC machines can process part programs written in higher-level languages like APT. Two main types of DNC systems are Behind the Taper Reader (BTR) system and specialized MCU. BTR systems directly link the computer and standard NC controller unit, operating similarly to traditional NC.
The DNC computer provides instruction blocks, which the controller uses in two temporary storage buffers to translate into machine operations. This system has a relatively cheap cost. In contrast, specialized MCU systems use a customized machine control unit to facilitate communication between computers and machine equipment.
How Direct Numerical Control Works?
Direct Numerical Control (DNC) is a process set in a manufacturing unit where a set of machines is controlled by a set up computer with the help of a direct connection to the same. It is based on real-time data and involves data collection from the machines and passing the same to the mainframe, at regular intervals. The operator will be in control of the mainframe computer through remote access. A DNC will not contain a tape reader. Instead, it has several part programs that are transferred to the machines from the computer memory, In certain situations, the machine controllers will not be able to store the entire program.
A DNC machine facilitates the development of a centralized machine control system, boosting productivity and managing time. It eliminates the need for a system reader and punched taps, providing valuable data for understanding production performance. Part programs can be conveniently stored in computer files, aiding decision-making. However, DNC machines are costly and require highly automated spaces. Additionally, their central control system prevents machine operations from ceasing if the computer fails.
