Influence of geometric parameters of the hottest t

2022-08-19
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The influence of tool geometric parameters on the machining accuracy of NC lathe

introduction

in NC machining, in order to reduce the surface roughness of the machined workpiece, slow down the tool wear, improve the service life of the tool, select the appropriate cutting force and other factors, usually the turning tool will have the influence of tool geometric parameters such as the arc radius of the tool tip R, the principal deflection angle Kr, and the deviation of the tool tip from the center of the part, It must cause the axial dimension error and radial dimension error of the machined parts, so that the running track in machining is different from the surface shape of the machined parts. Because the surface shapes of the machined parts are different, the differences are also different

two error analysis and improvement methods

the following requirements for plastics are mainly two points: analyze turning and understand the differences caused by the selection of its parameters on the surface shapes of various parts of experimental Machinists and the measures taken

1. The influence of the arc radius of the turning tool tip on the surface of cylindrical parts

as we all know, the forming of the surface of the machined part is guaranteed by the running track of the tangent point between the turning tool and the surface of the part

for turning with the main deflection angle kr=90 degrees, see Figure 1.1. The axis on the surface of the machined part is convenient for data analysis and migration. The dimension is guaranteed by the tip arc vertex a

figure 1.1

when (D-D)/2=ap>r, it can be seen from the figure that the axial dimension change caused by the arc radius of the tool tip Δ A is

Δ A =b-a=r

where: B - axial dimension of the part; A - actual axial displacement; R - arc radius of tool tip

at this time, the actual axial displacement of the tool is the length a:

a=b- Δ A=b-r

when (D-D)/2=ap

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