Cutting Insert Contact Geometry for Thin-Holder Edge Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting inserts face challenges in maintaining blade-edge positional accuracy and shape accuracy, especially when one cutting edge is damaged, and require holders with larger thickness, leading to inefficiencies and limitations in size compatibility.
Innovation Solution
A vertical-type cutting insert with a through hole, featuring multiple contact surfaces and inclined surfaces for secure holding by a holder, allowing for the use of damaged cutting edges and accommodating holders of various thicknesses, while maintaining positional accuracy through symmetric and inclined surface configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cutting insert size is made smaller, then the holding force is lowered, but the positional accuracy of the blade edge deteriorates
Solution Approach 1:
The cutting insert is divided into multiple functional surfaces: a first contact surface perpendicular to the through hole center axis for primary positioning, a second contact surface parallel to the center axis for lateral support, and a third inclined contact surface for additional stabilization. This segmentation allows each surface to contribute specifically to holding force and positional accuracy independently
Solution Approach 2:
The invention adds a third dimension of contact by introducing the inclined third contact surface that contacts the holder at an angle. This multi-dimensional contact approach (combining perpendicular, parallel, and inclined surfaces) enhances the holding mechanism beyond traditional single-surface contact, enabling accurate positioning even with smaller insert sizes
2Strength
If a contact surface is provided to restrict the cutting insert to the periphery of the blade edge, then the holding force is improved, but the usability deteriorates when the cutting edge is damaged
Solution Approach 1:
The contact surfaces are segmented into distinct functional areas: the first contact surface for primary holding, the second contact surface for lateral restriction, and the third inclined contact surface for additional support. This segmentation allows the holding mechanism to function independently of any single cutting edge condition
Solution Approach 2:
The multiple contact surfaces serve multiple functions simultaneously: they provide holding force, positional accuracy, and rotational restriction. The design allows the insert to be securely held regardless of which cutting edge is being used, making the system universal across all four cutting edges even when some are damaged
3Stability of the object's composition
If the holder thickness is increased to support the peripheral side surface of the cutting insert, then the holding stability is improved, but the adaptability deteriorates
Solution Approach 1:
The invention transitions from relying solely on holder thickness for stability to using multi-dimensional contact surfaces. The combination of perpendicular, parallel, and inclined contact surfaces creates a stable holding mechanism that functions effectively with holders of varying thicknesses, eliminating the need for thick holders
Data Source
AI summary
A cutting insert and a cutting tool which can suppress lowering of blade-edge positional accuracy while holding by a holder having a small thickness is enabled are provided.The cutting insert includes a first end surface, a second end surface, and a peripheral side surface connected to the first end surface and the second end surface and having a rake face, a flank, and a cutting edge formed in a connection region between the rake face and the flank, and a through hole penetrating the first end surface and the second end surface is formed. It is the cutting insert including a first contact surface substantially perpendicular to a center axis direction of the through hole and capable of contacting the holder, a second contact surface substantially in parallel with the center axis direction of the through hole, substantially perpendicular to a plane including the first contact surface and capable of contacting the holder, and a third contact surface inclined with respect to the center axis direction of the through hole and capable of contacting the holder, and a cutting tool including the cutting insert as above.