What are the benchmarks for the positioning of the CNC machining of the cutting machine?

- Mar 22, 2019-

In the process analysis of the CNC machining of the precision four-column hydraulic cutting machine, the gyro pays attention to the selection and installation of the workpiece positioning base. The following issues should be noted:


(1) Following the principle of uniformity of the benchmark, the uniform positioning reference is used to process each surface, which not only ensures the positional accuracy of each surface of the plant, but also avoids the positioning error caused by repeated clamping.


(2) Strive to design the benchmark, the process benchmark and the difficulty of the programming calculation.


(3) Set the process reference on the workpiece contour as necessary, and remove it after the machining is completed.


(4) Generally, the machined surface should be selected as the positioning reference for CNC machining.


The process analysis and review of the developed NC machining objects is generally carried out in the design of parts and blank drawings, so many problems will be encountered. In particular, the original parts of the ordinary machine tool rAu work on the CNC machine tool processing, will encounter more trouble. Because the product has been finalized, in order to adapt to CNC machining, the parts drawing and the blank drawing must be changed greatly, and this is not only a matter of the process department. Therefore, the process programmer should work closely with the product designer to conduct a process review before the product parts have been finalized, fully consider the process characteristics of the CNC machining, and make the parts drawing, base, structure, etc. meet the requirements of CNC machining. Under the premise of not affecting the function of the parts, the design of the parts is more satisfied with the requirements of the CNC machining process.


CNC button milling includes flat milling, 2D contour milling, planar cavity milling, drilling, wall hole machining, box-like parts machining, and 3D complex profile milling. These machining operations are generally performed on CNC hammer milling machines and boring and milling centers. Shape milling with complex curved contours, complex pocket milling and milling of 3D complex profiles must be programmed with computer-aided CNC programming, while other machining can be manually programmed. Also, HJ uses graphical programming and computer-aided numerical control programming.