Triangular Cutting Insert Support for Stable Turning Tool Fixation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing turning tools face challenges in prolonging the life of the tool main body and ensuring stable fixation of the cutting insert due to deformation and point contact issues, which lead to reduced tool life and instability during cutting operations.
Innovation Solution
The design incorporates a cutting insert with a recessed triangular shape and a protrusion on the back metal that resembles the recess, allowing for surface contact and load dispersion, thereby increasing the wall thickness of the back metal and preventing deformation, ensuring stable fixation and extended tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the back metal is made thin to reduce material usage and weight, then the tool main body becomes lighter and more economical, but the back metal deforms under cutting load and the cutting insert becomes unstable
Solution Approach 1:
The back metal is segmented into a thin-walled portion and a protrusion portion. The thin-walled portion reduces overall weight and material usage, while the protrusion portion (with increased wall thickness) provides stable fixation for the cutting insert. This segmentation allows different parts of the back metal to have different thicknesses optimized for their specific functions.
Solution Approach 2:
The back metal exhibits local quality variation through the protrusion portion, which has increased wall thickness compared to the thin-walled portion. This local thickening at the protrusion provides enhanced strength and stability for cutting insert fixation, while the rest of the back metal remains thin to reduce overall weight and material consumption.
2Device complexity
If the tip of the back metal contacts the cutting insert at a single point, then the structure remains simple, but the cutting load concentrates at that point causing deformation and reduced tool life
Solution Approach 1:
The contact between the back metal and cutting insert is transformed from point contact (zero-dimensional) to surface contact (two-dimensional) through the protrusion. The protrusion's surface contacts the cutting insert over an area rather than at a single point, distributing the cutting load across multiple dimensions and preventing stress concentration.
Solution Approach 2:
The protrusion is pre-formed on the back metal before cutting operations begin. This preliminary structural feature ensures that when the cutting insert is mounted, the load is immediately distributed over the protrusion surface rather than concentrating at the tip, preventing deformation from the outset.
3Adaptability or versatility
If an equilateral triangular cutting insert is used to maximize usage by 120-degree rotation, then the insert is economical and versatile, but the back metal becomes too thin and unstable
Solution Approach 1:
The back metal is divided into thin-walled portions (for weight reduction) and a protrusion portion (for stability). The protrusion portion specifically addresses the stability issue caused by the equilateral triangular insert geometry, allowing the insert to maintain its versatile 120-degree rotation capability while the protrusion provides localized support where needed.
Data Source
AI summary
A cutting insert 2 includes an upper surface 6, a lower surface 7 on a side opposite to the upper surface 6, and a peripheral side surface 8 connecting the upper surface 6 and the lower surface 7. A cutting edge 61 is formed in at least a part of a first ridgeline 60 where the upper surface 6 and the peripheral side surface 8 intersect. At least one bottomed recess 10 recessed from the lower surface 7 to the upper surface 6 is formed in an outer peripheral portion of the lower surface 7. Each of the recesses 10 is formed in a substantially triangular shape having a first vertex P, a second vertex Q, and a third vertex R. The first vertex P and the second vertex Q are respectively positioned on a second ridgeline 70 where the lower surface 7 and the peripheral side surface 8 intersect. The third vertex R is positioned on the lower surface 7 and separated from the second ridgeline 70.