It is roughly estimated that by 2015, the total assets of China's CNC machine tool industry will exceed 240 billion yuan, the sales revenue will exceed 180 billion yuan, and the total profits will reach 12 billion yuan, with an average annual growth rate of more than 10%. At the same time, the technology of CNC machine tools in China will also be greatly improved. By the end of the "12th Five Year Plan", high-end CNC machine tools and basic manufacturing equipment will achieve significant improvement in independent innovation ability, master a large number of core technologies with independent intellectual property rights, and the overall technical level will enter the international advaCNCed ranks. By then, the mainframe, CNC system The fuCNCtional components are "medium scale and high-end industrialization. China will develop a batch of key equipment with international advaCNCed level, and the market share of high-speed, precision vertical and horizontal machining centers, CNC lathes and other products with large imports will be significantly iCNCreased.
CNC machining process generally needs to consider the positioning datum, processability, process route formulation, tool selection, clamping mode, process parameters and cutting methods of the parts to be machined. In the traditional machining mode, these considerations have been simplified. Therefore, the CNC processing technology has more factors and is more complex than the ordinary processing technology. Therefore, the entire process of the CNC processing technology should be comprehensively analyzed, reasonable processing technology should be adopted, and the processing scheme should be improved as a whole.
The thermal deformation in CNC machining is a more prominent problem. Because CNC machining processes multiple surfaces at the same time, the heat generated in cutting cannot be dissipated in time. However, if there is no dwell time like traditional machining, the machining efficieCNCy will be affected.
Due to the characteristics of CNC machining, the machining methods that are not suitable for traditional machine tools are highly feasible in CNC machining. The tailstock guide support boring and the cantilever boring that are transmitted have been replaced by the fixed cycle boring and head turning boring. The dressing method, filling method and empty tool method in the traditional hole processing technology have been replaced by back boring method, numerical control dressing method and arc interpolation.