When processing hardware fittings, the commonly used mechanical equipment is a CNC lathe, CNC lathe turning processing hard, high efficiency, high machining accuracy, surface shape is complex, compared with the ordinary lathe processing has a qualitative leap. However, when the nc lathe turning processing process choreography is very important. We also met the same machine tool equipment of the same products, processing, because of the different processing technology, processing quality of the products have very big difference.

The ideal process should not only ensure fits a pattern of the cultural relics, qualified, should be able to make the function of nc machine tool has a reasonable application, and gives full play to. The efficiency of the numerical control machine tool is a kind of automation equipment, its efficiency is larger than that of ordinary machine tools 2? Three times, in order to give full play to the characteristics of nc machine tools, processing are analyzed, the workpiece before programming, according to the specific circumstances, select the economic and reasonable process scheme. Thoughtless nc machining process influence the nc machine tools, production efficiency and improve the quality of the important factors that manufacturing cost.

1, the division of the nc machining process

CNC machine tool processing parts, more concentrated technology, all the process, should be completed as soon as possible once clamping, the classification principle of commonly used procedures have the following two kinds:

1) in order to ensure the accuracy of the principle

Enrichment condition of the nc machining process, rough, finishing in clamping, often to ensure parts and machining precision of parts processing precision of the deformation of the thermal deformation and the influence of cutting force, should respectively from the rough, finishing.

The principle of the 2) improve the production efficiency

In reducing conversion time of nc machining, save the knife of time, need to parts of the same knife processing should be complete, on the other a knife, machining parts. Should be reduced as far as possible, at the same time air travel, parts processing, with the same knife should be short route of the machined part.

In the actual production, often according to the cutting tool or the classification of the surface nc machining processing.

2, the selection tool knife site

In nc machining, CNC program shall specify the cutting tool relative motion artifacts. In the numerical control turning, formed on the surface of the workpiece depends on location and the shape of the rotor blade enclosure, but in programming, simply describes the selected point on the tool system can track. Cutting knife is on the programming, knives, cutting tools, site selection of representative of the method is described in machining path in point of trajectory.

In the numerical control turning, theoretically can choose tools for knife site anywhere, but in order to facilitate users to programming and guarantee machining accuracy, cutting tool selection has certain requirements and skills. In nc machining, the choice of the knife sites generally follow the following rules: should be endmill cutter axis and cutting tool basis points: the ball milling cutter head is ball head: its position should be a drill tip: an imaginary point or point arc lathe tool should be center, reamer parts should be paid attention to when the choice.