Method for controlling cutting force mutation in curve turning machining

Abstract

The invention discloses a method for controlling a cutting force mutation in curve turning machining. The method comprises the steps of adopting a B-spline curve method to perform parameterized processing on a cutting edge and a workpiece contour curve, establishing a unified computing model containing key geometric parameters, analyzing constrained relationships between coefficients of a cutting force model and a force vector, a speed vector and a chip flow vector, proposing a cutting force model coefficient calibration method, further determining cutting force model coefficients, judging a position where mutation of the cutting force occurs during the actual curve machining process by means of the established cutting force model, and further adjusting a feed amount of a cutter at the cutting force mutation position so that variation of the cutting force tends to be stable at the position. Compared with the application of a linear cutting modeling technology at present, the method provided by the invention can complete the curve turning machining efficiently.

Description

technical field [0001] The invention relates to a method for controlling sudden change of cutting force in curve turning, which belongs to the field of curve turning technology. Background technique [0002] Curve turning is a common processing technology in the industrial fields such as weapons and vehicles, such as turning the outer circle of the projectile, turning the convex and variable ellipse piston profile, etc. Due to changes in the curvature of the workpiece contour curve, the cutting force is prone to large changes, causing cutting load impacts on the tool and the workpiece, aggravating the wear and breakage of the blade, and even causing the tool to break, affecting the processing quality of the part and reducing production efficiency. In the existing technology, when facing the outer circle turning and inner hole boring of the projectile, the cutting force will have a sudden change in the actual processing process. Usually, too small tool feed rate is used to av...

AI Technical Summary

Problems solved by technology

Due to changes in the curvature of the workpiece contour curve, the cutting force is prone to large changes, which will cause cutting load impact on the tool and the workpiece, aggravate the wear and breakage of the blade, and even cause the tool to break, affecting the processing quality of the part and reducing production efficiency.

In the existing technology, when facing the outer circle turning and inner hole boring of the projectile, the cutting force will have a sudden change in the actual processing process. Usually, too small tool feed rate is used to avoid the sudden change of the cutting force. This cutting amount selection method It tends to be conservative, which leads to excessive energy consumption and high processing costs, which have become the bottleneck restricting the development of cutting technology for difficult-to-machine materials; even if cutting force modeling technology is used, it is only for straight line cutting, facing the outer circle of the body, variable ellipse surface, etc. It is also not suitable for turning with variable curve curvature

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