Rationality of product processing technology

1. The geometrical conditions that constitute a contour

In the turning process of manual programming, to calculate the coordinates of each node; During automatic programming, all the geometric elements that make up the contour are defined. Therefore, attention should be paid when analyzing the figure:

(1) Whether a dimension is omitted on the figure, which makes its geometric conditions inadequate and affects the composition of the contour;

(2) Whether the position of the graph line is fuzzy or the size is not clearly marked, so that programming can not start;

(3) Whether the geometrical conditions given in the figure are unreasonable and cause difficulties in mathematical processing.

(4) The dimensioning method on the drawing should adapt to the characteristics of CNC lathe machining, and the dimensioning should be marked with the same datum or the coordinate dimensions should be directly given.

2. Dimensional accuracy requirement

Analyze the requirement of dimensional accuracy of drawing to determine whether it can be achieved by turning process, and determine the process method to control dimensional accuracy.

In the process of this analysis, some dimensions can be converted at the same time, such as incremental dimension and absolute dimension and dimension chain calculation. In the use of CNC lathe turning, often the required size to take the maximum and minimum limit of the average size of the size as the programming basis.

3. Requirements for accuracy of shape and position

The given shape and position tolerance on the drawing is an important basis to ensure the accuracy. When processing, to determine the positioning datum and measurement datum in accordance with its requirements, can also be carried out according to the special needs of CNC lathe

4. Surface roughness requirement

The surface roughness is an important requirement to ensure the micro precision of the surface, and it is also the basis for choosing CNC lathes and cutting tools reasonably and determining the cutting amount.

5. Material and heat treatment requirements

The material and heat treatment requirements given on the drawing are the basis for choosing the type of cutting tool and CNC lathe and determining the cutting amount.