1. The problem with a configuration FANUC OiTB system and used for RE2B type axle half fine cutting LC34-300 CNC horizontal lathe (hereinafter referred to as 34 mt), frequent during processing irregular blade failure, most near axle end face, a few located in the root of the axle journal, dust-proof plate the or dust board seat.Repair it with the knife axle most not allowed and scrap, waste shaft within 1 year according to the statistics of 12 the number of root, economic loss of nearly 70000 yuan (5, 600 yuan\/root x 12).2. The processing path analysis according to the type RE2B axle technology analysis, and the root of the shaft neck and dust shield block the the 3 and a half times fine cutting is complete, the rest parts one and a half fine cutting finished.Based on reducing cutting tool moving empty times and shorten the processing time under the premise of RE2B axle half fine cutting tool path is: starting close to point A to cut the point B to point C, tool to C1 point to start the first turning to the D1, E1, F1, H1 and J1 points cut to K1 and retreat quickly to C01 – feed to C2 points to start the second turning to the D2, E2, F2, H2, J2 point cut to K2 point and retreat quickly into our fleet to feed to C0 points to start the third turning to the C, D, E, F, G, H, J and K points cut to L and retreat quickly to L0 to return to the starting point.3. The four steps in place four steps in place method is the maintenance personnel in maintenance machine series and macro structure, design and manufacturing process on the basis of standardized parts, follow the “fault record in place – diagnostic analysis in place – breakdown maintenance and maintenance record in place” four steps, accidental fault of a rapid processing machine tool has the characteristics of comprehensive maintenance method.(1) failure record in place.Machine tool failure, the operator first outage protection field (generally don’t cut off the power supply), then a detailed record the fault details and timely notify the maintenance personnel.What mainly include: the content of the fault record what time, what operation, alarm and other conditions, etc.(2) the diagnostic analysis in place.Maintenance personnel to maintenance based on past experience accumulation, the integrated use of modern modular machine tool maintenance method, principle analysis, alarm, information analysis, data\/state test, on-line monitoring method, isolation method, forced closure legal, program test method to the flow direction of medium and working method, analysis of fault diagnosis to quickly determine the possible causes and the location of a fault.Figure 2 RE2B type axle half fine cutting tool path signal and bp (1) axis of the body (2) wheel seat 3. 4. The dust shield block root dust shield block 5. 6. Journal root journal (3) the breakdown maintenance in place.For wear or damage of surveying and mapping, replacement and precision mechanical parts, electrical components, circuit boards for simple repair or replace whole, modify machine parameters or processing procedures, etc.Finally, each link is verified idle running machine tool and work-piece.(4) maintenance records in place: after the machine to transfer to other tasks, maintenance personnel maintenance process should be written to the device file archiving, for future reference.4. Waste shaft failure analysis and solution based on the four steps in place maintenance requirements, with isolation method, in turn, first eliminate the X axis precision ball screw pair drive anomalies, loose coupling of the failure possibility, then use substitution method to replace the X axis alpha iA1000 incremental encoder, but irregular knife fault still exist.Hence change the X axis coder line, 34 mt run for a period of time does not appear to plunge into the knife of failure.Thus, determine the 34 mt irregular plunge into a knife is caused by cable anti-interference performance degradation or accidental disconnection between data transmission anomalies.After the replacement of X axis coder line to eliminate the fault, based on RE2B type axle length is 181.8 mm and 2 more knife most near end, half-and-half O0212 fine cutting procedure is optimized, so that Mr Dao waste caused by shaft damage to a minimum.Optimizing content: after cutting tool along the Z to 0.4 mm, the blade and instruction M00 waiting for the operator coarse axle diameter;If numerical mm diameter size is less than the regulation, it will be 0.4 mm thick section of turning off, heavy axle can continue to use after milling center hole.34 mt operation a few months time, never happen “irregular firm knife to workpiece scrap” failure, the operator is familiar with the parts of the program and be skilled operation optimization.