Tool Holder With Oblique Supporting Surfaces For Tangential Cutting Insert
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Solution Overview
Problem
The complex geometry of tangential cutting inserts makes it difficult to arrange them in tool holders such that cutting forces are properly transmitted and chip flow is not impaired, leading to production complications and potential damage to cutting edges.
Innovation Solution
A tool holder with a quadrangular bottom surface featuring obliquely positioned supporting surfaces and a raised ridge for self-centering the cutting insert, which can be produced as a separate shim or integrated with the holder, providing enhanced force transmission and chip protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the cutting insert has complex side surface geometry to achieve chip-forming functions, then chip flow is improved, but the arrangement and positioning in the tool holder becomes difficult
Solution Approach 1:
The invention divides the bottom surface into functionally distinct segments: a quadrangular outer geometry for simple positioning, and an integrated supporting region with oblique surfaces for force transmission. This segmentation allows the complex chip-forming side surfaces to coexist with a simplified positioning interface, resolving the contradiction between complex geometry and ease of arrangement.
2Manufacturing precision
If the bottom surface geometry corresponds to the complex side surfaces, then positioning accuracy is improved, but production complexity increases
Solution Approach 1:
The invention applies local quality by creating a supporting region with specific oblique surfaces only where force transmission is needed, while the rest of the bottom surface maintains a simple quadrangular geometry for easy manufacturing. This localized complexity achieves positioning accuracy without requiring the entire bottom surface to be complex, thus reducing overall production complexity.
3Reliability
If frustoconical protrusions are added to support the cutting insert, then positioning reliability is improved, but chip flow is impaired and production complexity increases
Solution Approach 1:
Instead of adding protrusions to the bottom surface of the cutting insert (as done in prior art), the invention inverts the approach by creating supporting surfaces directly on the tool holder's bottom surface that contact the cutting insert's side surfaces. This inversion eliminates the need for complex protrusions on the insert itself, preserving chip flow while achieving reliable positioning.
4Object-affected harmful factors
If the bottom surface protrudes beyond the cutting insert, then cutting edges are protected from damage, but the device complexity increases
Solution Approach 1:
The invention merges the protective function with the existing quadrangular bottom surface geometry. By making the bottom surface slightly larger than the cutting insert, the protection function is achieved without adding separate protective elements or complex structures. The same simple geometric extension that defines the receptacle boundaries also provides chip protection, thus avoiding increased device complexity.
Data Source
AI summary
In the case of a tool holder having a receptacle for a cutting insert, in particular a tangential cutting insert having eight lips, having a lateral bearing surface, a rear bearing surface and a bottom surface, the bottom surface is quadrangular in plan view and has a raised supporting region which has two supporting surfaces, positioned obliquely with respect to one another, for the cutting insert.