Drilling Insert Ridge Structure for Chip Control in Tough Steels
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Solution Overview
Problem
Conventional cutting inserts for drilling struggle with effective chip control when processing difficult-to-cut materials like stainless steel and mild steel, as widening the chip former to improve chip control performance reduces the effective chip control area and interferes with chip disposal.
Innovation Solution
The design includes a ridge portion with a ridge body and a ridge extension portion that protrudes upward from the cutting insert's upper surface, allowing for increased chip former width without reducing the effective chip control area, by extending the ridge portion parallel to the cutting edge to facilitate chip control and minimize interference with the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the chip former is increased to improve chip control performance for difficult-to-cut materials, then chip control performance is improved, but the effective chip control area is reduced and chip disposal is interfered with
Solution Approach 1:
The invention extends the chip former in the axial direction (adding a third dimension) rather than only increasing width. The extended chip former protrudes beyond the outer peripheral surface of the cutting insert in the axial direction, creating a multi-dimensional chip control structure that increases effective control area without reducing the insert's radial dimensions.
Solution Approach 2:
The chip former is divided into multiple segments: a main body portion and an extended portion. This segmentation allows different regions to perform specialized functions - the main body provides primary chip control while the extended portion adds axial control capability, thereby increasing overall effective chip control area without compromising chip disposal space.
2Reliability
If the width of the chip former is increased to improve chip control performance, then chip control performance is improved, but interference with the cutting edge increases
Solution Approach 1:
The extended chip former is positioned specifically at the rear portion of the cutting insert, away from the cutting edge location. This localized placement ensures that chip control functionality is enhanced in the rear region without creating interference with the cutting edge at the front, allowing each region to optimize its specific function.
Solution Approach 2:
By extending the chip former axially rather than radially outward, the invention adds chip control capability in a different dimension that does not spatially conflict with the cutting edge. The axial extension creates a multi-layered chip control structure that separates chip control functions from cutting functions in the radial direction.
3Ease of manufacture
If a conventional symmetric cutting insert design is used, then manufacturing is simplified, but chip control performance for difficult-to-cut materials is insufficient
Solution Approach 1:
The cutting insert employs an asymmetric design where the chip former extends preferentially in specific axial directions rather than uniformly in all directions. This asymmetric configuration optimizes chip control for the specific cutting geometry and chip flow patterns encountered during drilling of difficult-to-cut materials, while still maintaining reasonable manufacturing complexity through systematic design.
Solution Approach 2:
Different regions of the cutting insert are given different functional properties - the chip former region receives the extended axial structure for enhanced chip control, while other regions maintain conventional dimensions. This localized differentiation allows the insert to achieve superior chip control performance without requiring complete redesign of the entire insert structure.
Data Source
AI summary
A cutting insert for drilling includes an upper surface, a lower surface formed on an opposite side of the upper surface, a side surface connecting the upper surface and the lower surface; a cutting edge formed at an intersection of the upper surface and the side surface, and a ridge portion formed to protrude upward from the upper surface to facilitate chip control. The ridge portion includes a ridge body spaced apart from the cutting edge and disposed at a central portion of the cutting insert for drilling; and a ridge extension portion extending from a vicinity of a corner of the ridge body in a direction parallel to the cutting edge.