Hammer Drill Bit Centering Tip with Concave Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drill bits for drilling in stone and concrete face reduced material strength and excavation rate due to the pyramidal structure of centering tips with flat limiting surfaces, leading to reduced drilling speed and increased breakage when encountering reinforcing iron.
Innovation Solution
The drill bit features concave limiting surfaces between linearly extending auxiliary cutting edges, providing a robust centering tip with a higher number of limiting surfaces and a smaller wedge angle for improved drilling performance, allowing for stable punctual drilling and reduced deviation at large bore depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the centering tip is formed with flat limiting surfaces creating a pyramidal structure, then punctual centering is achieved, but the material strength in the region of the centering tip is noticeably reduced
Solution Approach 1:
The patent applies curvature by replacing the flat limiting surfaces of the pyramidal centering tip with concave limiting surfaces. This curvature transformation strengthens the centering tip structure while maintaining its centering function, resolving the contradiction between achieving precise punctual centering and maintaining material strength.
2Ease of operation
If the centering tip is axially exposed to provide proper guidance, then centering guidance is improved, but the drill bit strikes reinforcing iron leading to breakup of the centering pin
Solution Approach 1:
The concave limiting surfaces create a more robust centering tip geometry that can withstand impacts with reinforcing iron without breaking, while still providing the necessary axial exposure for centering guidance. The curved surfaces distribute stress more effectively than flat surfaces.
3Strength
If the centering tip has a robust shape with concave limiting surfaces, then material strength is improved, but the excavation rate is reduced
Solution Approach 1:
The patent optimizes the parameters of the concave limiting surfaces, including the depth and curvature radius of the concavity, to achieve a balance between structural strength and excavation efficiency. By carefully controlling these geometric parameters, the centering tip maintains strength while minimizing impact on excavation rate.
4Stability of the object's composition
If the number of limiting surfaces is increased, then centering stability is improved, but manufacturing complexity increases
Solution Approach 1:
The centering tip is divided into multiple limiting surfaces (typically four concave surfaces) that provide stable centering guidance. This segmentation approach achieves the desired stability while keeping the manufacturing process manageable through standardized formation methods for each surface.
Data Source
AI summary
A drill bit for a hammer drill for drilling in stone, concrete and the like includes a drill bit head formed as a hard material body with radial legs and having at least three radially extending cutting bits formed on the radial legs, and a centering tip in a center of the hard material body and projecting beyond one of the cutting bits, with the centering tip having concave limiting surfaces stretching between the linearly extending auxiliary cutting edges.