Modeling the processing accuracy restrictions during the developing of the optimal cycles of the internal grinding

Inefficient using of CNC machine tools in the internal grinding operations due to lack of standards and methods of calculating the optimum cycles for operations led to the fact that in modern automated production cycle parameters selection is performed manually based on the experience and the adjuster by choosing cutting conditions experimentally, with a significant understating their level. To solve this problem, the method of calculation of optimal internal grinding cycle, which includes a model of the grinding process, a mathematical optimization method, the objective function and model constraints. The requirement to ensure the accuracy of the treated surface is a must for any internal grinding operations. Therefore, the restriction on the machining accuracy is one of the most important and obligatory in the optimization of operating parameters of internal grinding cycle. Due to the fact that the internal processing is used for grinding precise holes 6-7 quality class, the operating tolerances on the cards are set for not only the diametral dimensions, but also to shape deviations and location, the implementation of which requires substantial adjustment cycle. Therefore, restrictions on the model developed for the operation of precision internal grinding allows you to calculate all the main types of errors on the entire length of treatment, resulting in internal grinding: error diametrical size deviation from roundness, radial run-out; deviation from cylindricity, roughness and longitudinal section of a complete radial runout. All kinds of errors in the model restrictions are determined through the actual values of the radii of the treated surface, which is calculated by modeling the process of metal removal with each radius. Moreover, the actual calculation is carried out taking into account the radius of the original beats radius of the hole blanks and elastic deformation characteristics of the technological system. The developed model limitations precision machining is designed for use in the optimization of automatic internal grinding cycles in order to select the optimal combination of value and removes software innings of the allowance by steps cycle to ensure the prescribed accuracy of the machined surface.