The basic concept of digital control is not new at all, which can be traced back to the industrial revolution a few years ago, when Joseph Jaka developed a method to control textile looms with needle boards. But when he applied for a patent, he invented a patent. The Queen of England could not deny that he was right, because she thought it would make poor workers lose their jobs. In fact, this ancient invention can consider simple mechanical numerical control in the form of crude oil.
At present, NC programming is usually done by individuals with practical experience in processing workshops. The acquisition of this experience and related knowledge is very important, and it is also the part that needs to be deleted when formulating processing strategy. This is particularly useful, and it is often useful when processing complex parts.
Knowledge-based software system can capture the knowledge of NC programming, and establish a set of rules to establish a framework for guiding NC programmers to formulate machining strategies. The default method may be based on the establishment of materials, tolerances, surface finish, machine tool availability and part shape.
The knowledge-based system can also be used for some automatic NC programming tasks. This will provide greater consistency between processing strategy and planning and improve productivity.
Digital control also makes machine tools more universal than manual predecessors. 1 CNC machine tools can automatically produce all kinds of parts, each of which involves a wide variety of complex processing processes. Numerical control, so that the finished product can not be produced in a feasible form, from an economic point of view, manual control of machine tools and processes.
Like so many propulsion technologies, CNC was born in the laboratory, MIT technology. In the early 1960s, the concept of numerical control development was funded by the front line of the US Air Force. In the early days, CNC machine tools could cut straight lines effectively. However, the curve path has a problem because the machine tool must be programmed to perform a series of horizontal and vertical steps to generate the curve. Steps of short line compensation, these steps must be calculated.
Problem supplement: open top.
This problem led to the development of automatic programming tool language (APT content) in 1959. This is a special programming language of CNC, which uses English-like reports to define some geometric figures, describe tool configuration and specify necessary movements. The development of APT language is an important step forward, and the numerical control technology has been further developed. The original numerical control system is very different from what is used now. The machine has a hard logic circuit. The lesson plan was written in a file, and later it was changed to a magnetic plastic belt. The tape reader is used to interpret the instructions written on the tape drive. To sum up, all this represents a great progress in controlling machine tools. However, there are some problems in the development of NC.