The Study Of The NC Machining Process Standardization

At present, the quality of the NC program is determined by the programmers, itis varying from one to another. Some of the NC programs done by the programmerswho are short of knowledge and experience cannot let the part to meet therequirements. So, it doesn’t improve the production efficiency, and guarantee thequality of the parts. At the same time, some of the optimized NC program isn’treused and inherited. It causes the accumulation and non-standardized managementof the process file, and increases the management costs. The key of the all problem isthe non-standardized deal with the NC machining process. In fact, the process in theparts NC programming is fairly standard, especially in some standard parts such aselectrodes, inserts, which can apply the similar process. Mostly, the relationsbetween these parts are ignored; the inheritance and consistency are denied amongthe similar parts.Aimed at these phenomena and shortages, this paper is to standardize the NCmachining process. It applies the principle of similarity in the group technology toclassify the parts and establish the classification criteria, which are in accordancewith the shape feature and machining procedures. Then, the NC machining processis designed for each of the classifications, which includes the reference formachining, strategy, steps and machining parameters. And the process information isstored to the database. When a part is added, the appropriate process is reused after itis classified. So it can achieve the standard and automatic NC programming. Themain contents of this paper are as follow:1. The parts classification analysis. The machining features, especially theshape feature and the procedures in the process feature are analyzed, and then thesimilarity of the group technology is applied to establish the classification criteriaand classify the parts based on the features.2. The standard NC machining process design. The principles are analyzed fordesigning the NC machining process, which includes the NC machining process flow and contents such as the reference for machining, strategy, steps and processparameters in the group parts.3. Research of the storage and reuse of the NC machining process informationin group parts. It is referred to the storage mode choose, the process databaseestablishment, the implementation process of reuse, the modification of the similarprocess and so on.4. The NC machining process standardization system design. It is involved thesystem function design and structure design. The system is developed on thePowerMill by VB.net, so that it can reuse the appropriate process to achieve thestandard NC programming after the part is classified.