Multi-piece Spade Drill Head Wear Management
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Solution Overview
Problem
Existing drills face performance limitations due to uneven cutting speed distribution, leading to aggressive wear at the periphery compared to the center, and the high manufacturing costs of composite drills with multiple carbide regions.
Innovation Solution
A multi-piece spade drill head design featuring at least three removably secured insert pieces with aligned cutting edges, forming interfaces at different distances from the axis of rotation, allowing for individual replacement and indexing of worn parts without replacing the entire drill head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-piece solid drill or integrated drill with uniform material is used, then manufacturing simplicity and cost-effectiveness are maintained, but uneven cutting speed distribution causes aggressive wear at the periphery compared to the center
Solution Approach 1:
The drill head is divided into multiple separate carbide insert pieces (center insert and peripheral inserts) that can be individually replaced. This segmentation allows worn peripheral inserts to be replaced without replacing the entire drill head, addressing the wear uniformity issue while maintaining manufacturing simplicity.
Solution Approach 2:
Different regions of the drill head are equipped with replaceable carbide inserts that can be selectively replaced based on wear patterns. The peripheral inserts experience higher wear and can be replaced more frequently, while the center insert lasts longer, creating a localized replacement strategy that improves overall reliability.
2Reliability
If composite drills with multiple carbide regions are used to address uneven wear, then wear uniformity is improved, but manufacturing costs increase significantly
Solution Approach 1:
Instead of creating a complex composite drill with multiple carbide regions metallurgically bonded together, the invention uses separate, removable carbide inserts that are individually secured to the drill body. This approach achieves wear uniformity through modular replacement rather than through complex composite material construction, significantly reducing manufacturing costs.
Solution Approach 2:
The peripheral carbide inserts are designed as disposable or replaceable components that can be individually replaced when worn. This is more cost-effective than manufacturing expensive composite drills with multiple carbide regions, as only the worn inserts need replacement rather than the entire drill head.
3Manufacturing precision
If the entire drill head is replaced when peripheral inserts are worn, then cutting performance is maintained, but productivity is reduced due to unnecessary material waste
Solution Approach 1:
The drill head is segmented into replaceable carbide inserts and a reusable body. When peripheral inserts are worn, only those specific inserts are replaced while the drill body and center insert remain in use. This maintains cutting performance while extending the overall drill lifespan and reducing productivity loss.
Solution Approach 2:
The design allows for discarding only the worn peripheral carbide inserts while recovering and reusing the drill body and center insert. This selective replacement strategy maintains cutting performance without the unnecessary material waste of replacing the entire drill head, thereby improving productivity.
Data Source
AI summary
One non-limiting aspect of the present disclosure is directed to a multi-piece spade drill head for a spade drill, wherein the spade drill includes an elongate body portion and a cutting portion removably secured to an end of the body portion. The multi-piece spade drill head includes at least two insert pieces, each piece including a cutting edge. The at least two insert pieces are configured to be removably secured to the body portion of the spade drill adjacent one another and with the cutting edges of the insert pieces aligned to together form a cutting edge on an end of the spade drill.