Now with the development of the economy, the development of CNC machining customization technology is getting stronger and stronger. Many CNC machining custom industry is currently in a hot state, but in the need to process the factory, they know little about CNC machining customs and do not know how to choose. Therefore, this article mainly introduces some general knowledge of CNC machining customization technology.
CNC is the abbreviation of CNC machining, which is the process of removing material by precision machining. Precision machining, or precision machining, is the processing performed by high-precision machining machines. The main method to achieve precision machining of parts is to machine high-precision parts with high-precision machine tools. Error compensation techniques are used to improve the machining accuracy of high parts.
There are two main types of machining: manual machining customization and CNC machining customization. Manual machining customization is a method in which the machine operator processes various materials by manually operating machine equipment (such as milling machines, lathes, drill presses, and saws).
Manual machining is suitable for the production of small quantities and simple parts. High-precision machining (custom CNC machining) uses CNC equipment to perform mechanical operations, including machining centers, powder processing centers, WEDM equipment, thread-cutting machines, etc.
The total thickness of the metal layer removed from the machined surface during the change from blank to finished product is called the total machining allowance of the surface. The thickness of the metal layer removed in each process is called the inter-process machining allowance.
For rotating surfaces (e.g., external circles and holes), the machining allowance is considered in terms of diameter and is therefore called symmetrical abundance (i.e., bi-directional abundance). In other words, the actual thickness of the removed metal layer is half the diameter of the machining allowance. The machining allowance for a flat surface is a single edge allowance, such as the thickness of the metal layer being removed.
The purpose of leaving machining allowance on the blank is to eliminate machining errors and surface defects left by the previous process, such as a cold hard layer, porosity, vermilion layer, oxide on the forging surface, decarburization layer, surface cracks, internal stress layer after cutting, and surface roughness. Mention high working accuracy and surface roughness.
The size of the machining allowance has a great impact on machining quality and productivity. Too much machining allowance will not only increase machining workload and reduce productivity but also increase material, tool, and power consumption, thus increasing machining cost.
Too small a machining allowance cannot eliminate various defects and errors in the previous process, nor can it compensate for fixture errors during the machining of that process, thus producing scrap. The principle of selection is to ensure quality and to make the margin as small as possible. Generally speaking, the more you finish, the smaller the margin.
