Grooving Tool Geometry for Low-Vibration Deep Groove Machining
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Solution Overview
Problem
Metal cutting parting-off and deep grooving operations face challenges such as chip jamming and vibrations, leading to tool breakage and poor surface finish, primarily due to deflection of the cutting tool during the process.
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, positioned to direct tangential cutting forces towards the machine interface, reducing deflection and vibrations by optimizing the blade and insert geometry and arrangement within a CNC machine tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grooving tool with insert width greater than blade width is used to direct cutting forces towards the machine interface, then vibrations and deflection are reduced, but device complexity increases
Solution Approach 1:
The blade portion is designed with asymmetric geometry where the insert width is deliberately made greater than the blade width. This asymmetric configuration allows the insert to extend beyond the blade edges, creating a structural arrangement that directs cutting forces toward the machine interface and reduces vibrations during grooving operations.
Solution Approach 2:
The solution transitions from considering only the functional cutting dimensions to incorporating the dimensional relationship between insert width and blade width as a critical design parameter. By optimizing the width dimension relationship, the patent achieves better force distribution and vibration control without requiring changes to the cutting edge geometry.
2Productivity
If feed rate is increased to improve productivity, then manufacturing time is reduced, but vibrations and tool breakage risk increase
Solution Approach 1:
The blade and insert geometry is designed in advance to preemptively counteract the harmful effects of high-speed cutting. The specific dimensional relationship between insert width and blade width creates a structural configuration that naturally dampens vibrations and distributes forces favorably, allowing higher feed rates to be used without encountering the usual vibration and tool breakage problems.
3Length of moving object
If deep grooving is performed to achieve the required groove depth, then the machining capability is improved, but deflection and vibrations increase
Solution Approach 1:
The extended insert width acts as a counterbalancing structure that offsets the deflection tendencies during deep grooving. The additional material beyond the blade edges provides structural support and creates a more favorable moment distribution, reducing the net deflection effect even when machining deep grooves.
Data Source
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AI summary
A method for cutting a groove of a predetermined groove width in a work piece, comprising the steps of providing a metallic work piece (18) having a peripheral surface (31); providing a grooving tool (1) comprising a blade portion (2) having a constant or substantially constant blade width (13), and an insert (3) having a maximum insert width (14) defined by a main cutting edge (11); selecting the insert width (14) to be greater than the blade width (13); connecting the grooving tool (1) to a machine interface (19) of a machine tool; rotating the work piece (18) about a rotational axis (A) thereof in a rotational direction (24); cutting a groove (33) in the work piece (18) by moving the tool (1) in a feed direction (15) towards the rotational axis (A) of the work piece (18) such that the groove width is equal to or substantially equal to the insert width (14) and such that a tangential cutting force (37) is directed towards or substantially towards the machine interface (19).