Milling Cutting Insert Geometry for Stable MAP Sintering
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Solution Overview
Problem
Cutting inserts manufactured using multiaxial pressing (MAP) often distort during sintering, leading to shape errors that require complex tool design and subsequent grinding corrections, which complicates the manufacturing process and introduces dimensional inaccuracies.
Innovation Solution
A cutting insert design with a specific geometry that allows for easier formation during the MAP process, featuring a circumferential surface with unique side surfaces and relief faces, enabling the pressing tool to retract without scraping the green body, thus maintaining form stability during sintering and simplifying tool manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a cutting insert is formed with a recess during the MAP operation, then the insert can be manufactured with complex shapes, but the insert distorts during subsequent sintering process
Solution Approach 1:
The patent applies preliminary action by designing the pressing tool to retract along a specific linear path that ensures the circumferential surface clears the green body before sintering. This preliminary clearance action prevents distortion during the subsequent sintering process, while still allowing complex shapes to be formed during pressing.
2Ease of manufacture
If the pressing tool retracts linearly from the green body, then the tool design is simplified, but the circumferential surface may scrape the green body causing burrs
Solution Approach 1:
The patent resolves this contradiction by adding a temporal dimension to the retraction path design. The linear retraction path is configured so that at different times during retraction, different portions of the circumferential surface clear the green body. This dimensional approach to path planning allows simple linear motion while preventing scraping and burr formation.
3Manufacturing precision
If grinding operations are performed to correct shape errors after sintering, then manufacturing precision is improved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by configuring the pressing tool retraction path to prevent distortion before sintering occurs. By addressing the shape accuracy issue during the pressing stage rather than correcting it after sintering through grinding, the manufacturing process is simplified and production time is reduced while maintaining high precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enables the production of cutting inserts with improved form stability during sintering, reducing the need for grinding corrections and achieving better tolerances and reduced burrs, thereby simplifying the manufacturing process and enhancing the precision of the cutting inserts.
Implementation Method 1
When sintered, the green body is compacted, shrinks in size and forms the cutting insert
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 1e~1g
AI summary
Herein a cutting insert (2) for a milling tool is disclosed. A longitudinal plane (LP) extends halfway between a first pair of opposing side surfaces (10, 11) of the cutting insert. A first axial relief face (30) adjacent to the a auxiliary cutting edge (38) and a first axial abutment face (32) form part of a first surface grouping (34) on a first side of the longitudinal plane (LP), and a second axial relief face (30') adjacent to a second auxiliary cutting edge (38') and a second axial abutment face (32') form part of a second surface grouping (34') on a second side of the longitudinal plane (LP). The first surface grouping (34) and the second surface grouping (34') meet in a partitioning line (L), wherein the partitioning line (L) extends in the longitudinal plane (LP), and wherein the partitioning line (L) extends from the first side (14) to the second side (16).