Indexable Cutting Insert Geometry for Stable Four-Edge Clamping
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Solution Overview
Problem
Existing indexable cutting tools face challenges in achieving efficient manufacturing, secure retention, and minimizing angles for abutment zones, leading to instability during cutting operations.
Innovation Solution
An indexable cutting insert with a peripheral side surface featuring four equally spaced abutment zones and four cutting portions, configured to maintain an abutment ratio of 1.0, allowing for efficient manufacturing and secure retention within an insert holder, where the abutment zones are planar and symmetrically arranged to reduce the number of angles required during manufacturing, and the insert holder design prevents the cutting insert from being pulled forward during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of abutment zones is increased to improve retention stability, then the retention stability is improved, but the manufacturing complexity increases due to more angles to be minimized
Solution Approach 1:
The peripheral side surface is segmented into exactly four abutment zones, each corresponding to one of four equally spaced cutting portions. This segmentation provides sufficient retention stability through multiple contact points while limiting the total number of zones to four, thereby controlling manufacturing complexity by minimizing the number of angles to be precision-formed.
Solution Approach 2:
The abutment zones are arranged asymmetrically relative to the cutting portions, with each abutment zone positioned to abut a specific cutting portion in a predetermined index position. This asymmetric arrangement optimizes retention stability for each cutting operation while maintaining manufacturability through standardized angular spacing.
2Productivity
If the number of cutting portions is increased to improve productivity, then the productivity is improved, but the abutment ratio decreases unless more abutment zones are added
Solution Approach 1:
Each of the four abutment zones is designed to serve multiple functions: providing retention stability, maintaining the abutment ratio of 1.0, and supporting equally spaced cutting portions. This multi-functionality allows the insert to achieve high productivity with four cutting portions while maintaining optimal retention through the same four abutment zones.
3Ease of manufacture
If planar abutment zones are used to simplify manufacturing, then the ease of manufacture is improved, but the retention stability may be compromised compared to curved surfaces
Solution Approach 1:
The abutment zones are designed as planar surfaces with specific angular orientations rather than curved surfaces. This parameter change simplifies manufacturing by allowing standard angular forming processes while the precise angular positioning of the four zones maintains retention stability through optimal contact geometry with the holder.
Data Source
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AI summary
The present invention relates to an indexable cutting insert (20) comprising two opposing end surfaces (22) with a peripheral side surface (24) and a central axis (C) extending therebetween. The cutting insert (20) has four cutting portions (26a, 26b, 26c, 26d), four spaced apart abutment zones (28a, 28b, 28c, 28d), and mirror symmetry about mutually perpendicular first and second planes (P1, P2) containing the central axis (C). Each of the four cutting portions (26a, 26b, 26c, 26d) has a cutting edge (32a, 32b, 32c, 32d) formed by the intersection of a rake surface (34a, 34b, 34c, 34d) and a relief surface (36a, 36b, 36c, 36d), the four rake surfaces (34a, 34b, 34c, 34d) and the four relief surfaces (36a, 36b, 36c, 36d) located on the peripheral side surface (24). Each of the four abutment zones (28a, 28b, 28c, 28d) represents a distinct region of the peripheral side surface (24) capable of making clamping contact with a corresponding region of a mating component in at least one index position of the cutting insert (20). The peripheral side surface (24) includes two pairs of opposing side surfaces (38a, 38b), a first pair of opposing side surfaces (38a) mirror symmetrical about the first plane (P1), and a second pair of opposing side surfaces (38b) mirror symmetrical about the second plane (P2). The four cutting edges (32a, 32b, 32c, 32d) are formed at the intersections between the two pairs of opposing side surfaces (38a, 38b). The second pair of opposing side surfaces (38b) includes the four rake surfaces (34a, 34b, 34c, 34d) and the four abutment zones (28a, 28b, 28c, 28d). In a side view of the cutting insert (20), each of the four abutment zones (28a, 28b, 28c, 28d) forms a V-shape with an adjacent one of the four abutment zones (28d, 28c, 28b, 28a).