Multi-flute reamer chip flute segmentation for chip control
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Solution Overview
Problem
Conventional rotary cutting tools for reaming operations lack control over chip formation and evacuation, leading to chips becoming tangled on the tool shank or remaining in machined holes.
Innovation Solution
Incorporating a cutting insert with a round chamfer and chip breaking feature along the rake face, and widening the chip evacuation flute to control chip shape and evacuation during cutting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reamers are used with standard chip flutes, then the structure is simple and easy to manufacture, but chips become tangled on the tool shank and remain in machined holes due to lack of chip control
Solution Approach 1:
The chip flute is segmented into multiple functional zones: a first portion with standard geometry for initial chip reception, and a second portion with widened geometry and specific angle characteristics for chip control and evacuation. This segmentation allows each zone to perform its specific function optimally while maintaining overall system effectiveness.
Solution Approach 2:
Different portions of the chip flute are given different geometric properties: the first portion has a first angle for initial chip engagement, while the second portion has a second angle and widened cross-section for chip control. This local differentiation of geometric quality enables precise control over chip formation and evacuation in different regions of the flute.
2Productivity
If multi-flute reamers are used to increase productivity, then more material can be removed per revolution, but chip evacuation becomes more difficult due to limited flute space
Solution Approach 1:
The chip flute geometry is modified in multiple dimensions: the cross-sectional area is increased in the second portion, the length of the second portion is optimized, and the angles are adjusted. These multi-dimensional geometric changes create additional chip evacuation capacity that accommodates the increased chip volume from multi-flute operation.
3Reliability
If chip breakers are added to control chip formation, then chip evacuation is improved, but the cutting insert becomes more complex and difficult to manufacture
Solution Approach 1:
The chip breaker geometry is defined by specific parameters including radius values and angular measurements. By optimizing these parameters, the chip breaker effectively controls chip formation while maintaining manufacturability through precise geometric specification rather than complex structural design.
Data Source
AI summary
A multi-flute reamer includes a cutting portion having a forward end and a rearward end, and a chip flute with a chip gash opening, and a cutting insert mounted on the cutting portion. A leading edge is formed at an intersection between a top surface and a radially-outward side surface, and a front edge is formed at an intersection between the top surface and a forward side surface. The cutting insert includes a rounded lead cutting edge formed at the intersection between the leading edge and the front edge, and the top surface includes a chip breaker having a bottom surface formed with a radius, R.