Profile transition method based on female cam coarse grinding

Abstract

The invention relates to a profile transition method based on female cam coarse grinding, comprising: utilizing the definition of a concave-convex function to find convex intervals on the original profile of a female cam through calculation; replacing the original profile between two end points of a smooth curve with the continuous smooth curve to form a new profile of the female cam, the smooth curve being respectively tangent with the original profile between two adjacent convex intervals at two end points; discretizing the original profile before finding convex intervals; discretizing the smooth curve according to a same discretization rule after finding the smooth curve; replacing discrete points on the original profile with discrete points on the smooth curve; and performing conversion from rectangular coordinates to polar coordinates so as to obtain new lift values and form new lift table data. The method can perform smooth transition on the profile of a female cam, and satisfy the high efficiency demand of coarse grinding of a new profile.

Description

technical field [0001] The invention relates to a cam profile transition method, in particular to a cam profile transition method based on the purpose of rough grinding of a female cam. Background technique [0002] During non-circular grinding, the concavity of the profile of a female cam (i.e., a cam with a concave profile) (i.e., the portion of the profile that is recessed into the body of the cam) typically limits the wheel diameter to a small range, the wheel diameter The size directly affects the processing efficiency. For rough machining, the use of larger grinding wheels can significantly improve the grinding efficiency. Therefore, it is necessary to simplify the cam profile to be obtained after rough grinding and increase the curvature of the concave part of the cam profile. However, the cam profile represented by the cam lift table is often a highly complex curve. Although the above purpose can be achieved to a certain extent by simply adding or subtracting the lif...

AI Technical Summary

Problems solved by technology

[0002] During non-circular grinding, the concavity of the profile of a female cam (i.e., a cam with a concave profile) (i.e., the portion of the profile that is recessed into the body of the cam) typically limits the wheel diameter to a small range, the wheel diameter The size directly affects the processing efficiency. For rough machining, the use of larger grinding wheels can significantly improve the grinding efficiency. Therefore, it is necessary to simplify the cam profile to be obtained after rough grinding and increase the curvature of the concave part of the cam profile. However, the cam profile represented by the cam lift table is often a highly complex curve. Although the above purpose can be achieved to a certain extent by simply adding or subtracting the lift value, it often causes the cam profile to be uneven. , so as to increase the difficulty of subsequent processing or reduce the efficiency of subsequent processing

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