Indexable Cutting Insert With Variable Width Clearance Surfaces
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Solution Overview
Problem
Existing indexable cutting inserts face challenges in providing multiple cutting edges and adequate reinforcement on small surface areas, limiting their indexability and durability in machining applications.
Innovation Solution
The design features a cutting insert with at least three primary cutting edges, each associated with a different side surface, including rake and clearance surfaces, and a unique clamping mechanism using tapered through holes to minimize surface area usage while ensuring secure mounting and reinforcement, allowing for multiple indexable positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insert uses a substantial amount of surface area for supporting surfaces and reinforcement, then the insert can be securely mounted and cutting edges can be reinforced, but the number of indexable positions is limited
Solution Approach 1:
The invention transitions from conventional constant-width clearance surfaces to clearance surfaces of variable width, where the width changes along the length of the clearance surface. This dimensional variation allows the insert to maintain adequate support and reinforcement while creating additional indexable positions, effectively resolving the contradiction between secure mounting and indexability.
2Area of moving object
If small cutting inserts are used to fit small toolholders, then the insert size is reduced for compact applications, but it becomes difficult to provide multiple cutting edges and adequate reinforcement
Solution Approach 1:
The invention applies local quality by varying the width of clearance surfaces at different locations. Specifically, the clearance surfaces have different widths at different positions along the insert, allowing adequate reinforcement and multiple cutting edges to be accommodated on small inserts while maintaining the necessary support structures for secure mounting.
3Ease of manufacture
If conventional clearance surfaces of constant width are used, then the insert structure is simple and easy to manufacture, but the surface area is insufficient for providing multiple cutting edges and reinforcement on small inserts
Solution Approach 1:
The invention changes the parameter of clearance surface width from constant to variable. By making the clearance surfaces of variable width rather than constant width, the insert can provide multiple cutting edges and adequate reinforcement on small inserts while remaining manufacturable through conventional pressing processes.
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A cutting insert is provided including at least three cutting edges, each cutting edge including a primary cutting edge. Each primary cutting edge is associated with a respective different side surface of the cutting insert, each side surface having a respective rake surface.