Things to pay attention to in CNC precision machining process

by:NJPE     2020-02-18
(1) Parts clamping method and fixture selection the clamping method of parts to be processed by numerical control machine tools should also reasonably select the positioning Benchmark and clamping scheme. When selecting the precise benchmark, generally, we should follow the two principles of 'benchmark unification' and 'benchmark coincidence'. In addition to these two principles, we should also consider: a. As far as possible, all surfaces should be processed in one positioning clamping. Therefore, it is necessary to select a positioning method that is convenient for all surfaces to be processed. B. When the workpiece is clamped at one time, all surfaces of the workpiece should be processed. c. When determining the placement position of the workpiece on the workbench, consideration should be given to the influence of the machining of each station, the length of the cutter and the rigidity of the cutter on the machining quality. d. Fixtures used in controlled processing should be assembled by common components and adjustable to shorten the production preparation cycle. (2) The arrangement of the processing sequence, when arranging the processing sequence, the basic principles must be observed, including 'first face and then hole', 'first rough and then fine', etc. In addition to these basic principles, we should also follow the following principles: a. According to the tool centralized process processing, avoid repeated use of the same tool, reduce the number and time of tool change. What are the social advances in the scope of application of numerical control machining centers, and the use of machining centers is becoming more and more extensive. At present, the processing intermediate varieties in the market are mixed with good and evil people, so some new companies do not know how to choose the processing intermediate and what kind of processing Intermediate should be done in detail. 1. Parts produced in small batches and repeatedly 2. Parts with messy shapes and high processing precision, which cannot be processed by universal numerical control machine tools or are difficult to ensure processing quality. 3. In the processing process, it is necessary to carry out multi-process Processing. If it is necessary to finish milling, boring, countersinking or tapping in one clamping. 4. It is necessary to strictly control Public Service Parts 5, workpieces with large cutting allowance 6, shells or box parts with difficult measurement, difficult control of feed and difficult control of cavity scale. 7. Technology, description of parts that will change B. For hole systems with high coaxial requirements, the hole systems at other coordinate positions should be processed after all the processing of the hole system is completed after one positioning, in this way, errors generated during repeated positioning can be eliminated and the coaxiality of the hole system can be improved. c. Choose to determine the knife point and change the knife point. Once it is determined, it should not be replaced.
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