Grinding Support Surfaces for Consistent Turning Insert Positioning
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Solution Overview
Problem
Existing turning tools and cutting inserts often require significant adjustments after changing cutting inserts, leading to inconsistent and unpredictable machining results.
Innovation Solution
The cutting insert features a peripheral surface with three grindable support portions that can be adjusted to consistently position the cutting edge relative to the tool body, compensating for random variations in geometry between different cutting inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If cutting inserts are regularly replaced due to wear, then the cutting edge position may differ significantly from previous operations, but maintaining consistent cutting edge position requires compensative adjustments via machine control system
Solution Approach 1:
The support portions are ground to precise dimensions before the cutting insert is mounted in the seat. This preliminary action compensates for random geometric variations from sintering, ensuring the cutting edge will be positioned correctly relative to the tool body from the start, eliminating the need for compensative adjustments after insert replacement
Solution Approach 2:
The invention changes the geometric parameters of the support portions through precision grinding to compensate for random variations in the cutting insert geometry. By adjusting the support portion dimensions, the cutting edge position is optimized to maintain consistency across multiple insert replacements
2Productivity
If cutting inserts are made by sintering carbide powder, then production is efficient, but random variations in geometry cause inconsistent cutting edge positioning
Solution Approach 1:
The cutting insert is divided into functional zones: the body formed by sintering and the support portions that are separately ground to precise dimensions. This segmentation allows the bulk material to be produced efficiently by sintering while only specific critical features require precision machining
Solution Approach 2:
The support portions are ground to precise dimensions before mounting the cutting insert in the seat. This preliminary precision machining compensates for random geometric variations from sintering, ensuring consistent cutting edge positioning without sacrificing production efficiency
3Manufacturing precision
If compensative adjustments are made via machine control system, then cutting edge position can be corrected, but machining time and complexity increase
Solution Approach 1:
The support portions are ground to precise dimensions before the cutting insert is mounted, preliminarily compensating for geometric variations. This eliminates the need for time-consuming compensative adjustments via machine control system after insert replacement
Solution Approach 2:
The ground support portions enable the cutting insert to self-position correctly in the seat without requiring external compensative adjustments. The insert automatically achieves the correct cutting edge position through its pre-ground support portions contacting the seat wall
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
This solution allows for consistent and predictable machining results by ensuring that the cutting edges of different cutting inserts are positioned consistently relative to the tool body, reducing the need for adjustments and improving overall machining performance.
Implementation Method 1
at least one of the support portions has a surface that has been grinded to adjust the position of the cutting edge with respect to the tool body
Implementation Method 2
cemented carbide cutting inserts are usually made from carbide powder that is pressed into the desired shape, and then sintered. During the sintering process the cutting inserts will shrink
Data Source
Figure 1~3
Figure 4~7b
Figure 8~12
AI summary
The invention relates to a cutting insert (1) mountable in a seat (2) of a tool body (10) of a turning tool. The cutting insert (1) comprises a first side (5) including a rake face (15), a second side (6) opposite the first side (5), a peripheral surface (7) extending between the first side (5) and the second side (6) wherein the peripheral surface (7) includes a relief surface (17), and a cutting edge (91) arranged at the intersection between the relief surface (17) and the rake face (15). The peripheral surface further comprises three support portions (8a, 8b, 8c) arranged to contact a seat wall of the seat of the tool body when the cutting insert is mounted in the seat, wherein at least one of the support portions (8a, 8b, 8c) has a surface that has been grinded to adjust the position of the cutting edge (91) with respect to the tool body (10) when the cutting insert (1) is mounted in the seat (2). The invention also relates to a method for manufacturing such cutting insert.