Insert Holder Tapered Coupling for Stable Cutting Tool Assembly
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Solution Overview
Problem
Existing cutting tool assemblies face challenges in securing reliable coupling between the insert holder and the tool shank, which can lead to instability during cutting operations, affecting the assembly's performance and productivity.
Innovation Solution
A cutting tool assembly design featuring a tool shank with a coupling opening and an insert holder with a coupling protrusion and tapered contact portion, where the coupling protrusion is detachably coupled to the tool shank using a fastening member, providing a fixing force through a tapered contact and contact surface configuration to ensure secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional coupling method (screw-thread-type or stop surface) is used to join the insert holder and tool shank, then the assembly can be manufactured with conventional methods, but the coupling reliability and stability during cutting operations deteriorates
Solution Approach 1:
The patent applies a tapered contact portion with a curved surface geometry instead of traditional flat or threaded coupling surfaces. The tapered shape with specific curvature radii (R1, R2, R3) creates a wedge-like mechanical interlock that generates radial clamping force, significantly improving coupling reliability and stability during cutting operations while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the geometric parameters of the coupling interface by introducing a tapered contact portion with specific angles and curvature radii. This parameter transformation converts a simple insertion coupling into a mechanically locked connection that resists axial and radial forces, enhancing reliability without proportionally increasing complexity
2Reliability
If the insert holder is designed for secure coupling during cutting operations, then coupling reliability improves, but the ease of assembly and disassembly deteriorates
Solution Approach 1:
The tapered contact portion creates a dynamic coupling mechanism where the insert holder can be easily inserted and locked into position, then easily removed by applying axial force to overcome the tapered lock. The design allows the coupling state to transition between easy assembly/locking and controlled disassembly, maintaining both reliability and operational ease
Solution Approach 2:
The coupling interface is segmented into distinct functional zones: the tapered contact portion for mechanical locking, the contact surface for fastening member engagement, and the insertion portion for alignment. This segmentation allows each zone to perform its specific function optimally, enabling reliable coupling that remains easy to assemble and disassemble
3Device complexity
If a simple coupling structure is used for the insert holder and tool shank, then device complexity is reduced, but the stability during cutting operations deteriorates
Solution Approach 1:
The tapered contact portion with curved surfaces creates a mechanically advantageous locking geometry that provides exceptional stability during cutting operations. The curvature radii (R1, R2, R3) are specifically designed to distribute stresses and prevent loosening under radial and axial loads, achieving high stability with minimal structural complexity
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 design enhances coupling reliability between the insert holder and the tool shank, maintaining stability during cutting operations and allowing for easy assembly and disassembly, thereby improving productivity by reducing replacement time and ensuring precise cutting.
Implementation Method 1
a tapered contact portion coming into contact with the coupling opening and providing a fixing force to fix the insert holder to the tool shank
Data Source
AI summary
A cutting tool assembly includes a tool shank having a coupling opening, and an insert holder having an insert body to which an insert is coupled and detachably attached. A coupling protrusion protrudes from one surface of the insert body and is detachably coupled to the tool shank. Located on the coupling protrusion are a tapered contact portion which comes into contact with the coupling opening and provides a fixing force to fix the insert holder to the tool shank, and a contact surface at a rear end of the tapered contact portion which couples to a fastening member.