The shape and position size of the geometric elements forming the outline of the parts (such as the position of the line, the radius of the circle arc, the arc tangent with the line, etc.) are the important basis for CNC programming. When manual programming, the coordinate value of each node should be calculated according to it. When automatic programming, all the geometric elements of the outline can be defined according to it. Whether either condition is unclear, the programming cannot proceed. Therefore, when analyzing the parts drawing, must be careful, ” -day found problems, should timely negotiate with the part designer to change the design.
In the positioning benchmark of CNC machining of automatic cutting machine, in the process analysis of CNC machining, pay attention to the selection and installation of workpiece positioning base pushing. The following issues should be noted:
(1) Follow the principle of the benchmark “, the selection of unified positioning benchmark processing each table back, not only to ensure the position accuracy of all sides of the factory, but also to avoid reducing the positioning error caused by repeated clamping.
(2) Strive for the identity of the design benchmark, the process benchmark and the programming calculation base.
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(3) If necessary, set on the outline of the workpiece and removed after processing.
(4) Generally, the processed surface should be selected as the positioning benchmark of CNC machining.
The process analysis and review of the proposed CNC machining object, generally in the parts and blank map design to calendar, so will encounter a lot of problems. In particular, the original parts in the ordinary machine tool rAu work in the CNC machine tool processing, will encounter more trouble. Because the cutting machine has been finalized, in order to adapt to the CNC machining, the parts diagram and the blank drawing must be greatly changed, and this is not only the matter of the process department. Therefore, process programming personnel to work closely with product designers, as far as possible before the product parts has not yet finalize the design process review, give full consideration to the characteristics of nc processing process, make the parts drawing annotation, base, structure to meet the requirements of CNC processing, on the premise of not affect the parts use function, make the design of parts and more meet the requirements of CNC processing technology.
The processing of CNC knob milling includes the milling of plane, two-dimensional contour, milling of plane cavity, drilling processing, wall hole processing, processing of box parts and three-dimensional complex surface milling processing. These machining is generally in the numerical control hammer milling machine and collar milling machining, which has complex curve contour shape milling, complex cavity milling and three-dimensional complex surface milling processing must use computer aided numerical control programming, and other machining can be manual programming, also HJ to use graphic programming and computer aided numerical control programming.
Post time: Jul-22-2024