Cutting Insert Layout With Longitudinal Rake for Tool Clearance
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Solution Overview
Problem
Existing cutting inserts occupy large space and compromise stiffness, leading to interference issues in automatic lathes with multiple tools, especially when machining complex shapes.
Innovation Solution
A cutting insert design with a rake surface facing the longitudinal direction, irregularly-formed parts for secure engagement, and a configuration that reduces lateral protrusion, allowing for improved stiffness and reduced space occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cutting insert is held in a state protruding laterally outwardly from the holder, then the cutting insert can be securely positioned, but the space occupied by the cutting tool becomes large, leading to interference between workpiece and tool or adjacent tools
Solution Approach 1:
The cutting insert is repositioned to protrude in the longitudinal direction of the holder rather than laterally, changing the dimension of protrusion. This dimensional shift reduces the lateral space occupied while maintaining secure positioning through the engagement between the holder's groove and the insert's protruding portion.
2Area of stationary object
If the plate-shaped blade part is arranged to protrude outward along the longitudinal direction of the holder, then interference between tools is reduced, but the stiffness of the cutting tool cannot be secured
Solution Approach 1:
The cutting tool is segmented into a holder and a separate cutting insert. The insert is secured to the holder through a groove-protrusion engagement mechanism, allowing the cutting edge to be positioned forward while the holder maintains structural stiffness. This segmentation enables reduced space occupation without compromising overall tool stiffness.
3Productivity
If the rake surface faces the longitudinal direction, then chip control is improved, but the cutting insert requires precise engagement with the holder to maintain positioning
Solution Approach 1:
The cutting insert features an asymmetric design with a rake surface facing the longitudinal direction and an irregularly shaped protruding portion that engages with a corresponding groove in the holder. This asymmetric engagement geometry ensures precise positioning while maintaining improved chip control through the longitudinal-facing rake surface.
Data Source
AI summary
The present invention provides a cutting insert that includes a first end surface, a second end surface, and a peripheral side surface that connects the first end surface and the second end surface and includes a cutting edge, in which: a contour shape of each of the first end surface and the second end surface has a longitudinal direction and a shorter direction; and a rake surface is provided in at least a portion of the peripheral side surface, the rake surface facing the longitudinal direction of each of the first end surface and the second end surface.