Grooving Insert Geometry for Low-Vibration Deep Groove Machining
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Solution Overview
Problem
Metal cutting parting-off and deep grooving operations face challenges with vibrations, leading to tool breakage and poor surface finish due to deflection of cutting tools, which existing methods have not adequately addressed.
Innovation Solution
A method involving a grooving tool with a blade portion and an insert where the insert width is greater than the blade width, allowing the tool to be positioned such that the tangential cutting force is directed towards the machine interface, reducing vibrations and deflection during deep grooving or parting-off operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional grooving tool with insert width equal to blade width is used, then the tool structure is simple, but vibrations occur due to deflection during cutting
Solution Approach 1:
The patent changes the geometric parameters of the grooving tool by making the insert width greater than the blade width. This parameter change allows the tool to be positioned with the cutting edge closer to the workpiece, reducing the overhang and thereby reducing deflection and vibrations during cutting operations.
2Length of stationary object
If the overhang of the grooving tool is increased to achieve greater grooving depth, then the grooving capability is improved, but deflection and vibrations increase
Solution Approach 1:
The patent introduces a new dimensional relationship by making the insert width greater than the blade width in the transverse direction. This allows the cutting edge to be positioned more favorably in space, effectively reducing the functional overhang without compromising the maximum grooving depth capability.
3Productivity
If a smaller insert width is used to reduce deflection, then the feed rate can be increased, but the groove width becomes limited
Solution Approach 1:
The patent changes the parameter relationship between insert width and blade width, making the insert width greater than the blade width. This allows optimization of the insert size for reduced deflection and higher feed rates, while the groove width is precisely controlled by the blade width, decoupling these two parameters.
Data Source
AI summary
A method for cutting a groove of a predetermined groove width in a work piece, including the steps of providing a metallic work piece having a peripheral surface; providing a grooving tool including a blade portion having a constant or substantially constant blade width, and an insert having a maximum insert width defined by a main cutting edge; selecting the insert width to be greater than the blade width; connecting the grooving tool to a machine interface of a machine tool; rotating the work piece about a rotational axis thereof in a rotational direction; and cutting a groove in the work piece by moving the tool in a feed direction towards the rotational axis of the work piece, such that the groove width is equal to or substantially equal to the insert width and such that a tangential cutting force is directed towards or substantially towards the machine interface.