Pentagonal Cutting Insert Clamping and Chip Evacuation
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Solution Overview
Problem
Existing cutting inserts for high-speed milling with ramp down operations face challenges such as increased complexity in tool production, inconvenient clamping mechanisms, and poor chip evacuation due to clamping arms, which affect stability and tool strength.
Innovation Solution
A polygonal prismatic cutting insert with a through bore and tangential abutment surface, featuring primary and secondary cutting edges and relief surfaces, designed to enhance clamping and chip evacuation by curling chips away from the tool axis, allowing for a robust and efficient clamping mechanism without additional clamping arms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamping arm is added to the clamping mechanism, then the insert clamping reliability is improved, but the device complexity increases and chip evacuation is hindered
Solution Approach 1:
The clamping function and positioning function are merged into a single clamping screw assembly. The clamping screw with inclined clamp surface provides both clamping force and positioning stability, eliminating the need for separate clamping arm and positioning elements, thus reducing device complexity while maintaining reliability
Solution Approach 2:
The clamping screw serves multiple functions simultaneously: it provides clamping force through the inclined clamp surface, positions the insert through the clamp surface geometry, and allows for easy release and repositioning. This multi-functional design replaces the specialized clamping arm while achieving the same reliability goals
2Stability of the object's composition
If a clamping arm is used for insert clamping, then the insert stability is improved, but the chip evacuation is worsened due to obstruction
Solution Approach 1:
The clamping arm is completely removed from the tool design. Instead, the clamping function is extracted and integrated into the screw assembly which positions and clamps the insert from above through the inclined clamp surface, eliminating the physical obstruction in the chip evacuation path while maintaining insert stability
Solution Approach 2:
Instead of using a horizontal clamping arm that extends into the chip flow path, the clamping mechanism is inverted to work vertically from above through the insert top surface. The inclined clamp surface of the clamping screw provides stability without interfering with lateral chip evacuation
3Reliability
If multiple clamping elements are used, then the insert clamping reliability is improved, but the operation convenience is worsened due to requiring multiple wrenches
Solution Approach 1:
The clamping screw assembly is designed to perform both clamping and positioning functions with a single element. The inclined clamp surface provides both the clamping force and the positioning geometry, allowing operators to use one wrench for both tightening and positioning adjustments, thereby improving operation convenience while maintaining reliability
Solution Approach 2:
The separate positioning and clamping functions are merged into the single clamping screw mechanism. The clamp surface geometry simultaneously provides positioning accuracy and clamping force, eliminating the need for separate positioning screws or adjustment mechanisms that would require additional tools
4Reliability
If the side inclination angle is decreased to improve clamping, then the insert positioning is improved, but the number of indexable cutting edges is limited
Solution Approach 1:
The insert design incorporates asymmetric features including the inclined clamp surface geometry and the specific configuration of cutting edges. This asymmetry allows the insert to be indexed to multiple positions (at least two different positions) while maintaining proper clamping and positioning through the inclined clamp surface, thereby increasing the number of usable cutting edges without compromising positioning reliability
Data Source
Figure 1
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Figure 3~4
AI summary
A cutting insert having a pentagonal prismatic shape. A cutting region (46) is associated with each polygonal side and is elevated with respect to a central tangential abutment surface (44). A primary cutting edge (50) associated with a polygonal side is formed at the, intersection of a primary rake surface (54) and a primary relief surface (56). A secondary cutting edge (52) associated with a rounded corner (40) is formed at the intersection of a secondary rake surface (72) and a secondary relief surface (74) and merges with the primary cutting edge. The primary relief surface forms with the associated side abutment surface a primary relief surface angle that varies from a maximal value adjacent an upper end (58) of the primary cutting edge to a minimal value. The secondary relief surface forms with the associated rounded corner a secondary relief surface angle that varies from a maximal value adjacent the primary cutting edge to a minimal value.