Cutting Insert Clamp Structure With Spherical Fulcrum Access
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Solution Overview
Problem
Existing cutting insert fixation devices face limitations in arranging the fixation screw, leading to difficulties in operating the cramp member, especially when the turning tool is attached to a turret, resulting in unstable fulcrum positions and inaccurate clamp lever contact with the cutting insert.
Innovation Solution
A tool body design featuring a clamp member with a spherical crown-shaped spherical head portion as a fulcrum, allowing the clamp member to swing freely vertically and horizontally, and a hook portion that contacts the cutting insert's diameter reducing portion, enabling the operating member to press the clamp member in a deviated position, thus facilitating the replacement of the cutting insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fixation screw is arranged on a surface different from the insert mounting seat surface, then the operating member can be positioned more accessibly, but the arrangement of the fixation screw is limited by the axial line direction
Solution Approach 1:
The clamp member is equipped with a spherical head portion that serves as a fulcrum, allowing the clamp member to swing freely in multiple directions (vertically and horizontally). This spherical geometry eliminates the directional limitation of conventional fixation screws, enabling the operating member to be arranged at optimal positions on the distal end surface for easy access during insert replacement operations.
2Ease of operation
If the lower end of the column surface of the supporting portion is rounded, then the clamp lever can swing smoothly, but the fulcrum position becomes unstable due to uneven abrasion
Solution Approach 1:
The spherical head portion is designed with a spherical crown shape that maintains a consistent curvature radius. This uniform spherical geometry ensures stable fulcrum positioning during repeated swinging operations, preventing the positional instability and uneven abrasion issues associated with rounded column surfaces.
3Device complexity
If the clamp member is constrained to a fixed plane, then the structure is simpler, but the operating member cannot be arranged optimally when the tool is attached to a turret
Solution Approach 1:
The spherical head portion enables the clamp member to swing freely in three-dimensional space rather than being constrained to a fixed plane. This provides the operational flexibility needed when the tool is mounted on a turret, allowing the operating member to be positioned on the distal end surface for optimal accessibility without increasing structural complexity.
Data Source
AI summary
A tool body to which a replaceable cutting insert is fixed includes: a holder: an insert mounting seat that is provided on a first surface of the holder; a clamp member that constrains the cutting insert placed on the insert mounting seat; and an operating member that presses a pressure receiving surface of the clamp member. The clamp member has the pressure receiving surface, a spherical head portion that is formed into a spherical crown shape, and a hook portion that protrudes to a side opposite to a side of the spherical head portion when seen from a side of the first surface. The insert mounting seat supports the clamp member to be swingable with the spherical head portion as a fulcrum, and the hook portion contacts a diameter reducing portion that is formed on an inner peripheral surface of an mounting hole for the cutting insert in a state in which the pressure receiving surface is pressed.