Toolholder with elongated seating pads for on-edge inserts
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Solution Overview
Problem
Existing toolholders for on-edge cutting inserts in metalworking operations sacrifice seating surface length to accommodate angularly shifted cutting edges, leading to reduced support for the inserts.
Innovation Solution
A toolholder design with a pocket featuring primary deep and shallow relief areas and support pads that maximize the length of the seating surfaces while providing clearance for the unique corner profile of on-edge cutting inserts, ensuring secure mounting without shortening the seating surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pocket is formed to provide clearance for corners with offset cutting edges, then the cutting insert can be securely mounted with multiple cutting edges, but the seating surfaces in the toolholder pocket are shortened, providing less support to the cutting insert
Solution Approach 1:
The cutting insert is divided into two radially offset segments, each with its own corner profile. The toolholder pocket is correspondingly segmented with two distinct relief areas: a primary deep relief area for the first segment corner and a primary shallow relief area for the second segment corner. This segmentation allows each relief area to be optimized independently, maintaining long seating surfaces while accommodating both offset corners.
Solution Approach 2:
Different regions of the pocket corner are given different depths and characteristics. The primary deep relief area extends substantially to the full depth of the cutting insert to accommodate the first segment corner, while the primary shallow relief area extends only to the depth of the second segment. This local differentiation allows maximum seating surface length to be maintained in critical areas while providing necessary clearance only where required.
2Adaptability or versatility
If the seating surfaces are shortened to accommodate offset corners, then clearance is provided for the corners of the cutting insert, but the support and stability of the cutting insert are reduced
Solution Approach 1:
The relief areas are segmented into primary deep and primary shallow zones, each tailored to accommodate specific segment corners. This ensures that clearance is provided only where geometrically necessary, while preserving full seating surface contact in areas requiring maximum support and stability.
Solution Approach 2:
The pocket geometry is locally optimized with varying relief depths: the primary deep relief area provides full clearance for the first segment corner extending to insert depth, while the primary shallow relief area provides targeted clearance for the second segment corner only. This local quality approach maintains long seating surfaces for support while providing precise clearance where needed.
Data Source
Figure 1
Figure 2
Figure 2B
AI summary
A toolholder (10) has a pocket (20) adapted to receive a double-sided on-edge cutting insert (25), wherein the corners (39 a-d) of each side (37 a-d) of the insert are radially shifted with respect to one another and has mounting pads (78, 80) preferably mounted about the sides of the cutting insert. The relief area for the corners (39 a-d) of the insert (25) is selectively fabricated to maximize the length of the support pads (78, 80) within the pocket (20) of the toolholder (10).