Grooving Tool Hinge Joint Axis Orientation
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Solution Overview
Problem
In face grooving operations, the rotation of cutting inserts around their long axis due to the orientation of the hinge joint leads to incorrect groove dimensions and defective side surfaces, and the use of balancing screws is cumbersome and costly.
Innovation Solution
A tool body with a hinge joint axis oriented perpendicularly to the lower inner seating surface, allowing the upper clamping member to pivot around the hinge joint, which improves load distribution and reduces the risk of fractures, eliminating the need for balancing screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hinge joint axis is oriented parallel to the lower inner seating surface (conventional design), then the tool body structure is simple and easy to manufacture, but the cutting insert rotates around its long axis during operation, leading to incorrect groove dimensions and defective side surfaces
Solution Approach 1:
The patent inverts the conventional hinge joint orientation by positioning the hinge joint axis perpendicular to the lower inner seating surface instead of parallel to it. This inversion eliminates the unwanted rotation of the cutting insert around its long axis, thereby achieving correct groove dimensions and preventing defective side surfaces while maintaining structural simplicity
2Manufacturing precision
If a balancing screw is added to prevent cutting insert rotation, then groove dimension precision improves, but device complexity increases and manufacturing cost rises
Solution Approach 1:
The patent extracts and eliminates the need for the balancing screw by fundamentally changing the hinge joint orientation. The perpendicular hinge joint configuration inherently prevents cutting insert rotation during operation, making the balancing screw unnecessary and thereby reducing device complexity and manufacturing cost while maintaining groove dimension precision
3Reliability
If the hinge joint is oriented parallel to the seating surface, then the structure is simpler, but uneven load distribution occurs on the cutting insert, increasing the risk of hinge joint fracture
Solution Approach 1:
The patent inverts the conventional hinge joint orientation to be perpendicular to the lower inner seating surface. This inversion creates a more favorable load distribution path on the cutting insert during grooving operations, reducing stress concentration and the risk of hinge joint fracture, while the perpendicular configuration itself remains structurally simple
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances precision and surface finish of grooves, improves load distribution, and reduces the risk of hinge joint fractures, while simplifying manufacturing and eliminating the need for balancing screws.
Implementation Method 1
The hinge joint is in this type of tool bodies in the form of an elastic material portion, which can be elastically deflected
Data Source
AI summary
A tool body and a turning tool for grooving operations having the tool body include a fitting member extending along a longitudinal first axis for fixing the tool body to a machine. The tool body's upper and lower clamping members each having respective inner seating surfaces facing one another and separated by an intermediate gap in which a cutting insert is insertable. A major part of the lower inner seating surface extends along a second axis perpendicular to the first axis. The clamping members are movable toward one another by a tightening device in order to secure the cutting insert in the intermediate gap. The tool body is integrally formed in a unitary piece. A hinge joint is formed between the clamping members, such that they are movable with respect to one another by turning around an axis of rotation of the hinge joint, extending perpendicularly to the second axis.