Indexable Cutting Insert Clamping With Inclined Fastener Head
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Solution Overview
Problem
Existing indexable milling tools with removable tips for thread cutting face issues with inconsistent axial force application and potential contact between fastening member heads and workpieces due to precision variations and shallow recesses, leading to unstable clamping and risk of tool head interference during cutting.
Innovation Solution
An indexable cutting tool design featuring a fastening member with a tapered surface that contacts a curved recess surface, where the fastening member's center axis is inclined to position the head part away from the cutting edge, allowing for oblique sliding contact and stable clamping of the cutting insert, preventing head contact with the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolt is inserted in a recess to secure the cutting insert, then the cutting insert can be fixed to the body, but the axial force of the bolt may not be sufficiently applied due to precision variations or gap formation
Solution Approach 1:
The recess inner wall surface is designed with a curved surface that bulges toward the center axis of the recess, and the fastening member has a tapered surface. This curvature design ensures consistent contact between the fastening member and the cutting insert, eliminating gaps and improving axial force transmission reliability.
2Ease of operation
If the recess is relatively shallow, then the fastening member can be easily inserted, but the head of the fastening member can readily pop out of the recess and may contact the workpiece
Solution Approach 1:
The center axis line of the fastening member is inclined such that the head part is located closer to the center side and proximal side than the distal end part. This asymmetric positioning ensures the head part is tilted away from the cutting edge, preventing contact with the workpiece during cutting operations.
Solution Approach 2:
The fastening member's center axis is inclined relative to the recess center axis, positioning the head part in a different spatial location (closer to center and proximal side). This dimensional change in head positioning prevents interference with the cutting trajectory while maintaining secure clamping.
3Strength
If the fastening member head is positioned closer to the cutting edge for secure clamping, then clamping force is improved, but the head part may contact the workpiece during rotation
Solution Approach 1:
The fastening member features an inclined center axis line where the head part is positioned asymmetrically closer to the center side and proximal side, while the distal end part maintains contact with the curved recess surface. This asymmetric design achieves secure clamping through the tapered surface contact while the head part is tilted away from the cutting edge to prevent workpiece contact.
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 provides stable and secure clamping of cutting inserts, preventing head part contact with the workpiece and ensuring reliable cutting performance by effectively transmitting axial force through the tapered surface, even when the fastening member's head would otherwise intersect the cutting edge's rotation trajectory.
Implementation Method 1
The tapered surface transmits the axial force of the fastening member to the cutting insert in oblique sliding contact with the curved surface
Data Source
AI summary
An indexable cutting tool stably clamps cutting inserts and prevents contact between head parts of fasteners and workpieces. Recesses with a bottom are formed in an upper surface of a cutting insert. Part of an inner wall surface of each recess curves and bulges toward a center axis of the recess. The recess is divided into first to fourth regions by a first imaginary reference plane parallel to a rotation axis of a body, and a second imaginary reference plane perpendicular to the rotation axis. The second region is on a center side and on a proximal side of the body. A tapered surface of a fastener contacts the curved surface within the second region. A center axis of the fastener inclines so a head part opposite a distal end part is closer to the center side and to the proximal side of the body than the distal end part.