CNC numerical control machining programming refers to the process of automatically generating numerical control machining program under the support of computer and corresponding computer software system. It gives full play to the computer's function of fast calculation and storage.
1. The principle of rough before fine
The processing sequence of each surface of jiangsu Dongfei Precision Manufacturing Co., Ltd. is roughing, semi-finishing, finishing and finishing in order to gradually improve the precision and surface quality of parts processed surface. If all the surface of the parts are processed by CNC machine tools, the working procedure is generally arranged in the order of roughing, semi-finishing and finishing, that is, the roughing is completed and then semi-finishing and finishing. Roughing can quickly remove most of the machining allowance, and then finish each surface in turn, so as to improve production efficiency, but also to ensure the machining accuracy and surface roughness of parts. This method is suitable for machining surface with high position accuracy. This is not certain, such as for some machining surfaces with higher dimensional accuracy requirements, taking into account the stiffness, deformation and dimensional accuracy of parts and other requirements, can also consider these machining surfaces according to rough machining, semi-finishing, finishing order to complete. For the machining surface with high precision requirements, between coarse and finishing machining processes, parts are used for a period of time, so that the surface stress of parts after rough machining is completely released, reducing the stress deformation degree of the surface of parts, which is conducive to improving the machining accuracy of parts.
2. Jiangsu Dongfei Precision Manufacturing Co., LTD
For box type, bracket type, body type and other parts, the plane contour size is larger, with the plane positioning is more stable and reliable, so it should be processed first plane, after processing holes. In this way, not only make the subsequent processing has a stable and reliable plane as a positioning datum, but also in the smooth surface of the hole processing, processing becomes easier, but also conducive to improve the machining accuracy of the hole. Usually, according to the parts of the processing parts of the division of the process, generally the first processing of simple geometric shapes, after processing complex geometric shapes; First machining parts with lower accuracy, and then machining parts with higher accuracy; First processing plane, after processing holes.
3, datum first processing principle
Processing in the beginning, is always used for finishing the surface of the benchmark processing out, because the surface of the locating datum, the clamping error is small, so any parts processing, always the positioning surface roughing and semi-finishing, precision even when necessary, for example, axial parts always locating datum for roughing and semi-finishing, precision work again. For example, axis parts are always processed center hole first, and then the center hole surface and positioning hole as fine benchmark processing hole system and other surfaces. If there is more than one precise datum, the processing of datum should be arranged according to the sequence of datum conversion and the principle of gradually improving the processing accuracy.
4, first inside out principle
For precision sleeve, the cylindrical and alignment of the demand is higher, generally based on the principle of cylindrical hole before, that is beyond the first round hole as locating datum processing, again with bore as positioning reference of high precision machining cylindrical, so we can ensure that the cylindrical and has high alignment requirements between holes, and use the fixture structure is simple.
5. The principle of reducing the number of knife changes
In nc machining, the machining sequence should be arranged as far as possible according to the order of the tool entering the machining position.
