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What is CNC Machine?

  • November 15, 2021

CNC (Numerical Control Machine Tool) is the abbreviation of Computer numerical control, which is an automatic machine tool equipped with a program control system. The control system can logically process the program with control codes or other symbolic instructions, and decode it, so as to make the machine tool move and process the parts.

The host machine is the main body of the CNC machine tool, including the machine body, column, spindle, feed mechanism and other mechanical parts. It is a mechanical part used to complete various cutting processes.
The numerical control device is the core of the numerical control machine tool, including hardware (printed circuit board, CRT display, key box, paper tape reader, etc.) and corresponding software, used to input digital part programs, and complete the storage of input information and data Transformation, interpolation calculation and realization of various control functions.
The driving device, which is the driving part of the CNC machine tool actuator, includes the spindle drive unit, the feed unit, the spindle motor, and the feed motor. Under the control of the numerical control device, it realizes the spindle and feed drive through the electric or electro-hydraulic servo system. When several feeds are linked, the processing of positioning, straight line, plane curve and space curve can be completed.
Auxiliary devices, some necessary supporting parts of index-controlled machine tools, are used to ensure the operation of CNC machine tools, such as cooling, chip removal, lubrication, lighting, monitoring, etc. It includes hydraulic and pneumatic devices, chip removal devices, exchange tables, CNC turntables and CNC indexing heads, as well as cutting tools and monitoring and testing devices.
Programming and other ancillary equipment can be used to program and store parts outside the machine.

Operation and maintenance
Design engineers are thankless jobs. They never stop spending energy to constrain tolerances and improve accuracy to fight failures and downtime. They have improved the design accuracy to about 1 micron year after year. They are perfectionists.
But when the tools are not properly balanced, their thorough and careful attention to detail produces waste. Machining parts with unbalanced tools is similar to shooting your own feet. The tool will wear out normally after performing the design task. However, the tool designed to perform that task is assumed to be well-balanced. If you use an unbalanced tool for this job, you are introducing new levels of wear, not only for the tool and spindle but also for the parts to be executed. Imbalance can have several effects: it can introduce additional vibrations to the spindle and its components, it will wear the tool irregularly, it can reduce the life of the tool and reduce the quality of the finished product.
Appropriate accuracy = better balance
In addition to the correct maintenance and handling of high-quality tool holders, it is important that the tool components are correctly installed on the machine spindle. In order to obtain a firm and stable connection, the matching spindle taper hole of the tool holder should be as accurate as possible. The difference between a well-fitted toolholder and a poorly matched toolholder is especially obvious at high speeds. You may have the best balanced tool in the world, but if it is not properly connected to the spindle, you are asking for trouble.

When you think that many machining centers sold today are equipped with spindles with a maximum speed of 10,000 rpm or more, you have to infer that the quality of the tool holder must be at the same level as the performance of the spindle. They must be firm, centered, properly balanced, and free from surface damage and contamination. If this is not the case, vibration must occur, which will cause chatter and reduce tool life and surface finish.

Not all tools need to be balanced to be correct, especially when the process causes cost increases and extra steps. Whether to perform tool balancing depends on the specific situation. The balancing effect is most prominent at high speeds, but balancing tools at any speed produces better shape and position accuracy, improved surface finish and extended tool life.

Balanced tools produce the best parts. Although it requires some extra time and care, a proper balance will extend the life of your tools and spindles and increase the available time, and produce accurate and high-quality parts for customers.

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D&S Automatic Co.,Ltd. located at the China plumbing town of Fujian Nan'an,It is a professional machine company. We supply you modern facilities,such as faucet, valve, brass fitting, cartridge, brass fittings, teflon tape and all kinds of machines. 

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