What is the difference between roughing and finishing in CNC machining?
This is a term used in CNC machining, CNC machining is generally divided into rough machining, medium machining, finishing machining. It is the last in place processing, control precision (accuracy) size. It is not that the CNC machining finishing tool is larger than the roughing tool. The CNC machining rough tool is not the same, the workpiece wear (a basic type of parts failure) degree is not the same, the processing accuracy (precision) is not the same
CNC machining parts surface quality and processing accuracy (precision) is closely related. CNC machining CNC is also called computer gongs, CNCCH or CNC machine tools is actually a call over in Hong Kong, a large number of reduction in the number of tooling, CNC machining complex shape parts do not require complex tooling, CNC machining is a new processing technology, the main work is to prepare the processing program, that is, the original manual CNC machining is a new machining technology, the main work is the preparation of machining programs, that is, the original manual to computer programming, such as to change the shape and size of the parts, only need to modify the parts processing procedures, suitable for new product development and reshaping. Imagine a part surface is very rough, its dimensional accuracy, shape accuracy may be high?
We use CNC machining process, in the construction of direct contact is the surface of the parts, and even many parts use the key (interpretation: metaphorical important part of things) in some surface quality (such as sliding bearings (bearing) and shaft contact surface, etc.). CNC machining parts of the surface quality often for the use of parts requirements, such as many parts require a very high surface hardness, such as Mold (title: mother of industry) of the molding parts, surface quality is to achieve the functional requirements of the use of parts. Rough machining should be considered to leave a sufficient and reasonable margin for finishing.
Finishing should select the correct datum positioning, choose a reasonable processing sequence, tool materials and cutting parameters to ensure the final quality of the product. CNC machining in CNC machine tools for parts processing a process method, CNC machine tool processing and traditional machine tool processing process protocols from the general point of view is consistent, but also undergone significant changes. The machining method of controlling the displacement of parts and tools with digital information. It is an effective way to solve the problem of variable variety of parts, small batch, complex shape, high precision and achieve efficient and automated processing.
CNC machining of the surface quality of the parts affect the use of the parts, the surface of the parts with defects affect the performance of the parts. CNC machining by the control system to issue instructions to make the tool to meet the requirements of various movements, in the form of numbers and letters to indicate the shape and size of the workpiece and other technical requirements and processing process requirements for processing. It refers generally to the process of machining parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC processing, in the aerospace industry also developed and used a series of advanced CNC machining technology. For example (for example, like), a part with a small crack on the surface, after use the crack is likely to expand and eventually cause the part to fracture.