Tool Path Generation for Cam Groove Chamfering
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Solution Overview
Problem
The existing methods for chamfering the opening edge of a cam groove, whether manual or using machine tools, result in uneven dimensional accuracy due to the varying pitch angle of the cam groove, which is a challenge for precision instruments and affects product value, and there is a difficulty in automatically specifying the corner parts and tool path offsets for machining.
Innovation Solution
A tool path generating method and apparatus that calculates the virtual traveling direction of a rotary tool and determines the position of corner parts based on shape data to generate a uniform tool path for machining, allowing for accurate chamfering along three-dimensional curves with changing opening directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conical tool is used to chamfer the cam groove, then the chamfering process can be automated with a machine tool, but the dimensions of the chamfered part will vary depending on the location in the recessed part due to varying pitch angles
Solution Approach 1:
The patent applies local quality by adjusting the tool path parameters specifically for the chamfering operation based on the local geometry of the cam groove. The control device calculates and sets different tool path offsets at different locations along the groove to compensate for varying pitch angles, ensuring uniform chamfered dimensions despite the three-dimensional curved nature of the groove.
Solution Approach 2:
The patent changes the machining parameters dynamically by calculating the tool path offset amount as a function of the pitch angle at each location. The control device modifies the tool path parameters (offset distances, angles) based on the varying geometry of the cam groove, transforming the fixed-parameter conical tool approach into a variable-parameter process that maintains dimensional uniformity.
2Ease of manufacture
If manual chamfering with a file is used, then no dedicated tool or NC program is needed, but the dimensional accuracy of the chamfered part cannot be increased
Solution Approach 1:
The system applies self-service by automatically generating the tool path data for chamfering based on the groove formation data already available. The control device uses the same shape data and tool path information from the groove machining process to automatically calculate and generate the chamfering tool path, eliminating the need for separate manual programming while achieving high precision.
3Adaptability or versatility
If the groove extends along a three-dimensional curve with changing pitch angle, then the cam groove can accommodate complex motion requirements, but the dimensions of the chamfered part will vary according to the change in pitch angle
Solution Approach 1:
The patent applies dynamics by making the tool path parameters dynamic rather than static. The control device calculates the tool path offset amount as a dynamic value that changes continuously along the three-dimensional curve of the cam groove, adapting to the varying pitch angle at each location. This dynamic adjustment ensures that the chamfered dimensions remain uniform despite the complex three-dimensional geometry.
Data Source
AI summary
This tool path generating method, which generates a tool path for machining a corner section at which a recess section machined in a workpiece intersects with the outer circumferential surface of the workpiece, includes: a step for calculating a virtual traveling direction, which is a movement direction of a point on the rotational axis line of a rotating tool when the recess section is machined; a step for calculating the position of the corner section from the virtual traveling direction and shape data of the workpiece; and a step for generating a tool path for machining along the calculated position of the corner section.