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       Spindle is the core component of machine tool, its function is to drive the cutting tool and machining rotation to achieve (wheel) or. In the numerical control lathe machine tools spindle of good or bad will directly affect the quality of the production of the machine tool processing and surface quality of parts, machining precision and production efficiency. So we want to improve the machining performance of machine tools, and then improve the machining quality and machining precision of the machine tool and the production efficiency, to make the machine can work out a more excellent quality of products, to meet the need of our growing production and life, then in the numerical control lathe machine tools spindle when the process is reasonable or not directly to made an important impact on the quality of the precision of the machine tool, in this paper, the important steps of using the numerical control lathe processing are analyzed and summarized, and the numerical control lathe processing of ultra precision machine tool spindle parts, for example through a lot of actual processing and analysis of process optimization, process defects and improvement measures are put forward, and find out its influence machining precision and quality

A, the analysis of technology for processing parts accuracy
1, need to processing technology of parts to conform to the number of car manufacturing characteristics
Lathe processing parts, the design of the drawing, in the size of the label should be on the premise of convenient processing and should be used directly on the drawings unified benchmark and coordinate dimension is given, so easy in programming and coordination of all sizes, in ensuring process benchmarking and design basis, so that the detection of benchmark and programming origin consistency provides convenient, so designers dismissed concerns on the use of product features, when the manual programming to calculate points coordinates and calculation points, should pay attention to whether sufficient to allow the conditions of the workpiece contour geometry elements, all geometric elements defined in automatic programming, manufacturability analysis should fully consider various geometry elements of fully rational characteristics. 
2, manufacturability of parts to processing is suitable for the characteristics of numerical control lathe processing
First make sure the shape of the parts and the inner hole need to try to adopt unified the size and geometry of the types of cutting tools, and to minimize the change of the number of cutting tool.Machining of parts quality is related to its contour shape and arc radius and so on.Therefore, in the open groove fillet cannot too small, because there are may not match the corresponding tool, to prevent bad structural parts of the edge stress concentration, thus the service life of parts affected, in order to prevent the repeat of the workpiece clamping forming processing of two dimension and position in the outline of the asymmetry, we in the arrangement process on the unification of the locating datum as far as possible.Can use the corresponding datum hole hole, workpiece with locating datum holes.The above two ways cannot achieve, unified standard can also consider using the processed surface, two clamping error can be reduced. 
Second, the machining method and process to appropriate
1, select the appropriate processing methods
In processing the suitable processing method is to ensure the machining accuracy and surface roughness of the workpiece can meet the design requirements and standards for the principle.To consider when choosing processing methods of parts shape, size, heat treatment, the technical requirements, in the processing method can achieve the same level, choose the most efficient and the most suitable processing method.According to the actual situation of production equipment, for some body on the surface of the hole reaming method choice, commonly used on the surface of the larger hole boring box, smaller hole generally adopt the method of reaming, at the same time, we also have to think as much as possible according to the actual situation in the processing of lower production costs, improve production efficiency and other factors. 
2, select the appropriate processing process
In the numerical control lathe processing, considering in a clamping can be completed a one-time whole or most of the process, process the concentration of as much as possible, this needs first to analyze the pattern of the machining of the parts can once clamping, if can not meet the conditions, to decrease the number of replacement for the number of the clamping and cutting tools.And divide work step, the machining precision and machining efficiency of two aspects of factors to consider, in the same order processing on the surface of workpiece is rough machining, semi-finishing and finish machining, can also be all surface roughing and finishing points. 
Three, make the best processing route
Set processing route principles should be followed: reduce tool idle time and ensure the processing route, the shortest and to reduce the invalid procedure;Ensure the surface of the parts precision and surface roughness;In order to reduce the workload of programming to simplify the numerical calculation;Some position control in the numerical control lathe is higher accuracy of positioning, cutter feeding line is not very important, so like this lathe is empty schedule for feeding shortest route, cutting tool in the axial direction of the distance to determine, and the factors affected by the length of workpiece. 
Four, set on nc lathe tool design and installation process card
1, the installation of tool design
We should consider when cutting tool installation, the most basic rule is: as far as possible to a unified process steps and set the benchmark to be programming;Less number of maximum likelihood in the clamping, when all the processing surface can win a clamping to complete;To give full play to the efficiency of nc lathe, achieve the purpose of avoiding artificial adjustment of machine.Also note when CNC lathe processing, when machining parts number is not many, put forward the basic requirements of the fixture in the nc machining: one is supposed to ensure coordinate direction and fixture coordinate direction between relatively fixed;Also want to pay attention to the size of the machine tool coordinate system and the relationship between the parts.To save production costs and save some production preparation time. 
2, about making CNC lathe process card
Numerical control lathe because the price is quite high and its performance is very good, due to the characteristics of numerical control lathe, adapted to process the content is complex, so it can perform complex tasks.Step improvement work on nc lathe programming problems is to improve the efficiency of the factors, so consider the main content in the nc machining process route, the knife point, changing knife point and the origin, cutting parameters, programming, etc. 
3, about the axial effect after improvement