Cutting Insert Rotation Prevention via Lateral Surface Features
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Solution Overview
Problem
Cutting inserts experience instability due to rotation torque during processing, primarily because the mating area between the insert and the tool holder is insufficient, leading to potential rotation issues.
Innovation Solution
The cutting insert features a cylindrical lateral surface with rotation-preventing parts, including an inner curved surface and a stepped rotation-preventing surface, along with holder contact surfaces, which provide a wider mating area and enhance stability by preventing rotation. These features include convexly rounded surfaces, relief surfaces, and transition surfaces to ensure secure engagement with the tool holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are formed on the upper or lower inner surfaces of the insert, then rotation is prevented during cutting, but the mating area is insufficient leading to unstable provision
Solution Approach 1:
The invention moves the rotation-preventing parts from the limited upper/lower inner surfaces to the lateral surface of the insert. This dimensional relocation provides a much larger mating area on the cylindrical lateral surface, enabling stable provision while effectively preventing rotation during cutting operations.
Solution Approach 2:
The lateral surface is divided into multiple rotation-preventing parts, each with convexly rounded surfaces that mate with corresponding features on the tool holder. This segmentation distributes the mating area across multiple contact zones, enhancing overall stability and rotation prevention.
2Reliability
If protrusions are formed on the upper or lower inner surfaces, then rotation is prevented, but the insert remains unstable under rotation torque
Solution Approach 1:
By relocating rotation-preventing parts to the lateral surface, the invention creates a larger moment arm and distributes torque resistance across multiple contact points on the cylindrical surface, significantly enhancing the insert's ability to withstand rotation torque.
Solution Approach 2:
The convexly rounded surfaces on the lateral surface provide localized high-strength contact zones that are specifically optimized for resisting rotation torque, while maintaining the overall structural integrity of the insert.
Data Source
AI summary
Provided are a cutting insert and a tool holder on which the cutting insert is provided. The cutting insert includes a circular upper surface, a circular lower surface, a cylindrical lateral surface for connecting the upper surface and the lower surface, an upper cutting edge formed between the upper surface and the lateral surface, a lower cutting edge formed between the lower surface and the lateral surface, and a plurality of rotation-preventing parts provided at the lateral surface so as to prevent the cutting insert from rotating with respect to the tool holder. Each rotation preventing part includes an inner curved surface recessed toward the center of the lateral surface and convexly rounded so as to form concentric circles in conjunction with the lateral surface, and a stepped rotation-preventing surface parallel to the axial direction of the insert and connecting the inner curved surface and the lateral surface.