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Slant bed CNC lathe factory guide nc machining requirements analysis

by:SNK     2020-08-22
Slant bed CNC lathe manufacturer guide nc machining requirements analysis release date: 2016 - 11 - 07 clicks: 2139 slant bed CNC lathe manufacturer guidance pattern suitable for nc machining of workpiece is analyzed, in order to make clear the processing of the numerical control machine tool processing content requirements. Analysis of workpiece is the beginning of the machining process, workpiece figure demands a result of the processing technology and target. ( 1) On the analysis of the dimensioning workpiece drawings with dimensions determine parts shape, structure, size and position requirements, is the main basis to correctly understand the parts processing requirements. Nc machining process engineering analysis of dimensioning parts should be paid attention to the following: (1) analysis pattern dimensioning method is adapted to the characteristics of nc machining. For nc machining, the size from the same datum mark, easy to process when programming design, process, testing benchmark and programming the origin has the same Settings. By different benchmark of local scattered dimensioning, often bring inconvenience processing technology design. (2) analysis of geometry elements of machining contour sufficient in the pattern. Because parts design personnel in the design process to be thoughtless or by negligence, often appear the geometrical element that constitute a contour conditions are not sufficient, is wrong, leakage, contradiction, ambiguous situation. When the above defect occurs, should be to pattern design and technical management personnel reflect in time, solve the rear can work for programming. (3) analysis of the unity of the positioning design datum and technology datum, analyzing the reliability of the locating datum, in order to design the clamping scheme, take measures to reduce the positioning error. ( 2) Tolerance analysis analysis of the pattern on the tolerance requirements, to make sure control the size accuracy of machining process. Affect the size of the choice of technological factors have the machining accuracy of machine tool, cutting tool selection, workpiece clamping position against the knife and determine the cutting depth and other factors. Size tolerance, from the point of view of the design of parts, is the scope of the error of the workpiece size allowed by the the size of its influence on the performance of the parts to use; Interpretation from the perspective of workpiece machining process of tolerance, it is one of the production orders, first it processing of all the total error of processing factors and processing factors must be within the tolerance range, or all of the processing factors & lsquo; Sharing & rsquo; The tolerance, tolerance is public the permissible error of all the processing factors. For nc machining, composed of machine tool, fixture, cutting tool and workpiece entity called & other; Process system & throughout; 。 Error of process system is the root of produce processing size error. Process system error with the error of control system, the error of the machine tool servo system, the positioning error, error against the knife and rigidity of machine tool, cutting tool, workpiece caused by other error, etc. In addition to the process system error, the coordinate data values include programming, cutting tool compensation value and tool wear compensation error, etc. For nc machining, the shape of the parts and position error mainly by machine tools main motion and feed motion mechanical effect of the geometric accuracy. Such as along the X axis movement in the direction of the line with the spindle axis is not perpendicular, is no guarantee that the vertical degree of the position tolerance requirement. ( 3) Requirements of surface roughness of the surface roughness is an important requirement, keep the micro precision of parts is also reasonable selection of machine tool, cutting tool and the important basis to determine the cutting parameter. The causes of the formation of mechanical processing, surface roughness, there are mainly two aspects, one is the geometric factors, physical factors. The geometric factors that affect the surface roughness, main is the tool relative to the workpiece feeding movement, on the surface processing residue left by the cutting area. The residual area, the greater the surface is rough. Residual area with the size of the feeding, tip arc radius and main Angle and the cutting tool. Physical factors and be processed material properties and factors associated with cutting mechanism. Such as: when the tool cutting plastic material medium speed generated when the devolop tumor with scale, makes the processing surface roughness is high; The high frequency vibration process system, make the blade vibration in machining surface, increase the value of surface roughness. ( 4) Other requirements analysis pattern material requirements given on the parts, is to choose the cutting tool ( Material, geometric parameter and service life) And selection of machine tool model and determine the important basis of cutting parameter, etc. Quantity of parts processing, the locating and clamping, cutting tool selection, process arrangement and the determination of feed line are the factor that cannot be ignored.
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