Grooving Tool Holder Geometry for Stable Chip Discharge
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Solution Overview
Problem
Existing cutting tools face challenges in stable chip discharge during grooving processes due to increased outer diameter of holders, which leads to clogging issues as the space between the holder and workpiece narrows, especially when dealing with cylindrical workpieces having a cylindrical bottom.
Innovation Solution
The cutting tool design incorporates a holder with specifically inclined wall surfaces and a concave third wall surface to create a larger space for chip flow and discharge, ensuring stable chip evacuation even with larger holder diameters, utilizing a holder with a rod shape and a head portion featuring an insert pocket, upper and lower jaw portions, and inclined surfaces to direct chips away from the narrow space between the holder and workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer diameter of the holder is increased to improve rigidity, then the rigidity of the holder is improved, but the space between the holder and workpiece becomes narrower and is liable to be clogged by chips
Solution Approach 1:
The invention introduces a third wall surface that extends in the axial direction, creating an additional spatial dimension for chip discharge. This axial extension provides a new pathway for chips to exit the cutting zone, bypassing the radially constrained space between the holder and workpiece, thereby resolving the chip clogging issue while maintaining the large holder diameter for rigidity
Solution Approach 2:
The holder's upper jaw portion is segmented into multiple functional surfaces: a first wall surface, a second wall surface, and a third wall surface. Each surface serves a specific function in guiding and discharging chips. This segmentation allows the holder to systematically manage chip flow through different directional paths, preventing clogging in the narrow radial space
2Strength
If the outer diameter of the holder is increased to make the outer diameter close to the inner diameter of the workpiece, then the rigidity is improved, but the space for chip discharge becomes narrower
Solution Approach 1:
The third wall surface extends axially from the second wall surface, utilizing the axial dimension to create additional discharge space. This transforms the chip discharge problem from a two-dimensional radial constraint into a three-dimensional solution, providing sufficient volume for chip evacuation without compromising holder rigidity
Solution Approach 2:
The inclined third wall surface creates a nested space within the holder structure itself. The chip discharge path is embedded within the holder's geometry, utilizing the holder's own volume to provide discharge space rather than requiring external clearance, thus maintaining close clearance between holder and workpiece while ensuring adequate chip flow area
Data Source
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AI summary
A holder according to one embodiment has a rod shape and includes a head portion located at a front end side. The head portion includes an upper jaw portion and a lower jaw portion located at a front end, an insert pocket located between the upper jaw portion and the lower jaw portion, a first wall surface located at an upper surface of the upper jaw portion and inclined in an extending manner from one side surface side, a second wall surface located closer to a rear end side than the first wall surface and inclined upward, a concave-shaped third wall surface located closer to the rear end side than the second wall surface, and a fourth wall surface inclined upward as the fourth wall surface extends away from the third wall surface. The third wall surface is concave downward from an upper end of the second wall surface.