The influencing factor of precision of treatment of numerical control lathe and raise measure

Element of 1 servo drive makes a principle by numerical control turner knowable, servo completes the treatment of the spare parts through drive lathe component, its are specific the process is: The fixed position of numerical control lathe is finished by ball guide screw, ball guide screw is undertaken controlling by drive of servo electric machinery, the transmission error of ball guide screw becomes one of influencing factor of fixed position precision. Numerical control lathe uses control of system of feed of servo of half closed-loop control commonly, its job principle is shown 2 times like the graph [3] . Machining a process normally, when guide screw is undertaken by control of servo electric machinery direction runs turning over, the empty movement phenomenon of meeting occurrence space, cause backlash error. The drive that controls lathe with duration and athletic orgnaization issue meeting generation flexibility to be out of shape in outside force action, and other position suffers treatment place and lathe force differs, cause stretch clearance to happen to also affect treatment precision. This part error is running to transmission for backlash sum of errors the overlay of the error. 3.

The treatment process of lathe of numerical control of element of change of parameter of 2 lathe tool basically is lathe tool in process designing control falls to undertake cutting to the spare parts, reach wants workpiece form. The tool cutting edge angle of lathe tool existence that turning machines and radius of circular arc of point of a knife [4] , expect to the club kind when undertaking machining, its axes dimension can be put in certain deviation, this one deviation and tool cutting edge angle become inverse ratio, follow the accretion of tool cutting edge angle and reduce, become direct ratio with radius of circular arc of point of a knife. So, when undertaking process designing to numerical control lathe need basis machines the characteristic of the spare parts, consider the deviation rule of axial dimension inside, to its relevant displacement length undertakes adjustment. When numerical control lathe runs, the high deviation of the radius of circular arc of point of a knife of lathe tool, tool cutting edge angle, point of a knife and spare parts center treatment precision that affects numerical control lathe possibly, need undertakes consideration and analysis when process designing. Basis before research, the difference with the influence degree certain existence that affects numerical control lathe to machine precision element, to its collect classification can get: Place of lathe itself error occupies scale to be 45%~65% , the process error place in treatment occupies scale to be 25%~40% , detect error place occupies scale to be 10%~15% . 4, the treatment precision that raises numerical control lathe to machine the significant step of precision how to raise numerical control lathe, production gives more accurate part, it is the stress that the scholar pays close attention to and studies all the time, machine the influencing factor of precision according to numerical control lathe, can be controlled through raising compensation method of slideway geometry precision, error, error to avoid a law and raise treatment precision. 1) raise slideway geometry precision. The development trend of numerical control lathe machines precision speed, high for tall cutting, higher cutting rate can cause vibration necessarily, so need slideway has better precision stability and taller stiffness, can use steeliness to slide the method of orbit whole grinding undertakes rising. Specific means is: Numerical control lathe uses the steeliness sliding slideway after hard processing of temper by dipping in water when the design, secure with bolt going up by the plane after slideway grinder grinding, aperture undertakes plenitude with the filler that note model between slideway and slideway base, undertake integral grinding finally, obtain better geometrical precision. 2) error compensation method. Error compensation method is the compensation function that adopts numerical control system, have compensatory method to the reference axis deviation that already existed, the lathe with not tall precision can go out through treatment of error compensation method relatively the product of high accuracy. This method can be finished by hardware or software. Use the numerical control lathe of servo of half closed circuit for example, as a result of the influence of retrorse deviation its locate precision exists error, can use methods of pair of retrorse deviation compensatory to eliminate an error [5] . 3) the error avoids a law. The error avoids a law is the design in numerical control machine tool and the error that production phase eliminates a likelihood to exist through raising the precision of mechanical spare parts. This method can go up from whole the error that better land reduces treatment precision, but cost is higher, and lathe of this numerical control is on original basis continue to improve treatment precision difficulty is greater. 5, the epilogue development as manufacturing industry, numerical control lathe is applied extensively as a kind of efficient automation machine tool, its machine the discretion of precision to affect the quality of the product and character of service directly. The article is in brief on the foundation that elaborates composition of numerical control lathe and working principle, studied numerical control car machines the influencing factor of precision, basically change to element of its servo drive and lathe tool parameter the element undertook labor. Advanced 3 kinds of significant step that raise numerical control lathe to machine precision, it is respectively: Raise compensation method of slideway geometry precision, error, the error avoids a law. To further research and treatment of lathe of analytic numerical control precision has fair referenced value. CNC Milling CNC Machining