Cutting Head Shank Coupling for Coolant Delivery and Deformation Prevention
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Solution Overview
Problem
Existing rotary cutting tools face challenges in coolant delivery and shank deformation due to the design of spade-like cutting heads, which require additional clamping means and may not adequately support cutting edges under tangential forces.
Innovation Solution
A rotary cutting tool assembly featuring a cutting head and shank with mating cylindrical surfaces and flute sections, including torque transmission and fixation walls, that securely engage with an interference fit, allowing for efficient coolant delivery and stabilization of the cutting head without additional clamping, and preventing shank deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If spade-like cutting heads are used to facilitate coolant delivery, then coolant delivery to cutting edges is improved, but additional clamping means are required and shank deformation may occur
Solution Approach 1:
The coupling arrangement is segmented into multiple functional walls: torque transmission wall for rotational force, fixation wall for axial positioning, and multiple base portions for clamping. This segmentation allows each wall to perform its specific function independently, achieving secure clamping without additional means while maintaining coolant flow paths.
Solution Approach 2:
The invention transitions from a single-plane coupling interface to a multi-dimensional engagement system with walls extending in radial, axial, and circumferential directions. The first and second base portions engage at different radial positions, creating a three-dimensional clamping structure that secures the cutting head without requiring additional clamping components.
2Reliability
If cutting head coupling portions fully overlie shank coupling portions, then secure retention is achieved, but coolant delivery to cutting edges is hindered
Solution Approach 1:
The cutting head coupling portions are nested within the shank coupling portions along the axial direction, with the cutting head positioned inside the shank's receiving portion. This nested arrangement provides secure retention through axial confinement while leaving the radial coolant flow paths open, allowing coolant to reach the cutting edges without being blocked by overlapping coupling surfaces.
3Reliability
If additional clamping means such as screws are used, then secure retention is achieved, but shank deformation may occur due to tangential forces
Solution Approach 1:
The coupling arrangement is self-clamping through the engagement between the first and second base portions and their corresponding walls. The torque transmission wall and fixation wall work together to automatically secure the cutting head without requiring external clamping means, thereby eliminating the risk of shank deformation from screw clamping while maintaining reliable retention.
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
The solution enables secure retention and efficient coolant delivery to the cutting edges, while minimizing friction and preventing shank deformation, thereby enhancing the tool's operational stability and effectiveness during cutting operations.
Implementation Method 1
The mounting portion and the receiving portion mate in shape and dimensions and each comprises at least two coupling portions bounded by the cylindrical outer surfaces... The clamping portions of the mounting and receiving portions engage each other, with their fixation walls, their torque transmission walls, their first base portions and their second base portions abutting each other.
Data Source
AI summary
A rotary cutting tool comprising a solid cutting head mounted to a shank. The cutting head comprises a cutting portion adjacent a cutting head front face and a mounting portion integrally formed therewith and extending rearwardly therefrom. The shank comprises a receiving portion extending rearwardly from a shank front face. When the cutting head is secured to the shank, the mounting portion is received in the receiving portion, and the shank front face is forwardly exposed and adjacent the cutting head front face.