Drill Insert Raised Part for Chip Curling and Discharge
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Solution Overview
Problem
Drill inserts face challenges in efficiently discharging chips during machining of ductile materials like stainless steels and low carbon steels, as the chips generated by inner and outer cutting edges have different shapes and rotational speeds, leading to accumulation and clingage issues.
Innovation Solution
A drill insert design featuring a first raised part with an inclined breaker portion and side portion, positioned closer to the outer cutting edge, which effectively curls and cuts chips from the outer cutting edge while ensuring a wide discharge space for the inner cutting edge chips, enhancing overall chip discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the height of the raised part is increased to improve chip discharge performance of the outer cutting edge, then the chips generated by the outer cutting edge can be curled and cut more effectively, but the level difference between the raised part and the upper face increases, causing chips to accumulate at the level difference portion
Solution Approach 1:
The patent applies local quality by creating different regions with different heights on the upper face. The first region along the outer cutting edge has a raised part for effective chip curling, while the second region along the inner cutting edge maintains a lower height to prevent chip accumulation. This localized differentiation allows each region to optimize its function without causing harmful effects in other areas.
Solution Approach 2:
The upper face is segmented into multiple regions with different heights. The raised part is divided into a first raised part along the outer cutting edge and a second raised part along the inner cutting edge, with different height levels. This segmentation allows independent optimization of chip discharge for each cutting edge while preventing chip accumulation issues.
Data Source
AI summary
A drill insert of the present invention comprises a corner part, and an upper face having a first side and a second side disposed on both sides of the corner part, respectively. The drill insert comprises a first cutting edge formed along the first side; a second cutting edge formed along the second side; a first region of the upper face located along the first cutting edge;a second region of the upper face located along the second cutting edge; and a first raised part disposed in the first region so as to lie at a higher position than the second region. The first raised part has an upper portion; a breaker portion configured to be inclined so as to become at a lower position as the first raised part extends from the upper portion; and a side portion configured to be inclined so as to become at a lower position as the side portion extends from the upper portion. The first raised part is disposed at a position closer to the first cutting edge than a bisector of the corner part when viewed from above.