Helical Cutting Edge Layout for Low-Mark Machining Tools
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Solution Overview
Problem
Existing machining tools leave visible machining marks on workpieces due to the angular spacing of cutting edges, which necessitate multiple cutting lines, leading to overlapping regions that form visible teeth and generate vibrations and noise.
Innovation Solution
A machining tool design where cutting edges of multiple cutting bodies overlap in a gapless manner perpendicular to the direction of rotation, forming an overall cutting edge on an imaginary helix line, minimizing the number of visible teeth and optimizing the distribution of cutting edges to reduce vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If cutting edges are arranged with angular spacing to allow isolated eroding or grinding, then ease of maintenance is improved, but machining marks and visible teeth on workpiece are generated
Solution Approach 1:
The patent transitions from traditional angular spacing in the rotational plane to a helical arrangement that extends into the axial dimension. Cutting edges are positioned along a helix line with specific pitch and angle, creating a three-dimensional distribution that eliminates angular spacing gaps while maintaining accessibility for maintenance. This dimensional extension allows cutting edges to overlap in the radial direction without requiring angular separation.
Solution Approach 2:
The cutting edge arrangement is segmented into multiple discrete cutting edges positioned at specific intervals along the helix line. Each cutting edge can be independently maintained while the overall helical pattern ensures continuous coverage. The segmentation allows for isolated maintenance of individual cutting edges while the helical geometry prevents visible marks on the workpiece.
2Productivity
If multiple cutting lines are arranged one behind the other to cover the workpiece, then productivity is improved, but overlapping regions create visible teeth and increase device complexity
Solution Approach 1:
The patent merges multiple discrete cutting lines into a single continuous helical cutting line. Instead of arranging separate cutting lines one behind the other, all cutting edges are positioned along a single helix line that winds around the tool axis. This merging eliminates overlapping regions between cutting lines while maintaining comprehensive workpiece coverage, thereby reducing visible teeth and simplifying the device structure.
Solution Approach 2:
The cutting edges are arranged along a helical curve rather than straight radial lines. This curvature allows the cutting edges to distribute their engagement points continuously around the workpiece surface, achieving complete coverage without requiring multiple discrete cutting lines. The helical path naturally eliminates overlapping regions that would create visible teeth.
3Manufacturing precision
If cutting edges overlap in the direction perpendicular to rotation to form continuous cutting line, then manufacturing precision is improved, but vibrations and noise increase due to multiple teeth engagement
Solution Approach 1:
The helical arrangement creates a periodic engagement pattern where cutting edges contact the workpiece at regular intervals along the helix. This periodic action distributes the cutting forces more evenly over time compared to simultaneous engagement of multiple teeth, reducing vibration amplitude and noise. The pitch of the helix determines the period of engagement, allowing optimization of the periodic action to minimize harmful vibrations.
Data Source
AI summary
A machining tool has a main body with a carrier surface. Cutting bodies each having a cutting edge are arranged on the carrier surface, the edges rotating in a direction of rotation which runs around an axis of rotation during the machining. The edges of a group including a plurality of cutting bodies overlap in a gapless manner with respect to the direction perpendicular to the direction of rotation and form an overall edge. All of the edges are arranged between end points of the overall edge. The group has a minimum number of teeth defined by the number of edges at least situated one behind the other in the direction of rotation in an intermediate region of the overall edge. The edges of the group overlap with respect to the direction perpendicular to the direction of rotation such that the minimum number of teeth is at least two.