Cutting Tool Curved Constraining Faces Fixation
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Solution Overview
Problem
Conventional cutting tools experience instability in fixation due to plastic deformation of constraining faces caused by thrust forces, leading to reduced durability during repetitive cutting operations.
Innovation Solution
A cutting tool design featuring a cutting insert with a curved constraining portion and perpendicularly oriented constraining faces in the insert pocket, which reduces the expansion of the gap between constraining faces and minimizes plastic deformation, thereby enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two constraining faces are formed substantially line-symmetrically at a predetermined angle with reference to the rotation axis direction, then the cutting insert is constrained, but the gap between the constraining faces is expanded by thrust force causing plastic deformation
Solution Approach 1:
The constraining faces are designed with curved surfaces having different curvature radii (R1 for the first constraining face, R2 for the second constraining face, where 0 < R1 < R2). This curvature design enables the faces to better distribute the thrust force, preventing gap expansion and plastic deformation, thereby maintaining fixation stability and improving durability simultaneously.
Solution Approach 2:
The invention applies different curvature radii to different constraining faces (R1 ≠ R2), creating local quality variations. The first constraining face has a smaller curvature radius R1 positioned at a first predetermined distance from the rotation axis, while the second constraining face has a larger curvature radius R2 positioned at a second predetermined distance. This localized differentiation optimizes the force distribution across the constraining faces.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
A cutting tool of the present invention includes a cutting insert and a holder having at a front end part thereof an insert pocket for attaching the cutting insert. The insert pocket includes a seating part including a seating face which is brought into contact with the lower surface of the cutting insert, and is inclined forward in a rotation direction of the holder as the seating face separates from the front end part of the holder; and a constraining part brought into contact with first and second side surfaces adjacent to each other among the side surface of the cutting insert. The constraining part includes a curved portion; a first constraining face which is connected to one end of the curved portion and extends perpendicularly with respect to the rotation axis of the holder as the first constraining face separates from the curved portion, or extends away from the front end part of the holder; and a second constraining face which is connected to the other end of the curved portion and extends toward the front end part of the holder in the direction away from the curved portion. A method of manufacturing a machined product using the cutting tool is provided.