Turning method of high-precision spherical surface

Abstract

The invention belongs to the field of machining, and relates to a turning method of a high-precision spherical surface. The turning method comprises the steps that 1) point coordinates X0 of the initiation site of a cutter on the spherical surface are obtained; 2) the point coordinates X0 of the initiation site are corrected according to the cutter tip arc radius r of the cutter and the influenceof changes of the cutting position of the cutter on the sphere diameter, and actual point coordinates X the initiation site of the cutter on the spherical surface are obtained; 3) the initiation siteis turned from the actual point coordinates X; 4) the cutter is moved to a second site, and the second site is turned by repeating the step 2) and the step 3); and 5) the step 4) is repeated until allspherical sites are cut. The turning method of the high-precision spherical surface can greatly improve the machining qualification rate and stabilize the part machining quality and is high in operability

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to a turning method, in particular to a turning method of a high-precision spherical surface. Background technique [0002] see figure 1 , A spherical part (manganese brass material product) of a certain part requires a surface profile of 0.005mm. Due to the limitation of the material used in the part, the grinding process cannot be used. When performing spherical turning, the three jaws of the lathe are reversely positioned and clamped, and the tool trajectory is an arc by CNC programming. The contour after machining is 0.01-0.015. Afterwards, local manual polishing is carried out through repeated testing and polishing. The quality is unstable and qualified. The rate is only 20%. Also, see figure 2 , after scanning the spherical surface by the stylus 360°, it is found that there is a local depression on the spherical surface. The reason is as follows: when the tool touches t...

AI Technical Summary

Problems solved by technology

The reason is as follows: when the tool touches the spherical surface, the cutting position of the tool nose arc in contact with the part is constantly changing, and when the tool cuts to the vertex of the spherical surface, the bottom end of the tool is in contact with the highest point of the part, The depth of cut here is the largest, making the spherical surface partially concave, and it is the depression here that causes the overall surface profile of the spherical surface to be out of tolerance

Images