Drilling Tip Projection Wear Concentration
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Solution Overview
Problem
Drilling tips experience significant wear at the furthest protruding apex portion, leading to belt-shaped wear that reduces boring efficiency and shortens the service life, particularly in gauge tips where contact with the boring wall surface is extensive, necessitating frequent repolishing and increased costs.
Innovation Solution
A drilling tip design featuring a base end portion with a columnar shape and a distal end portion that includes a curved convex surface with a projection extending radially, where the projection's width and height are optimized to concentrate wear, allowing only the projection to wear down before requiring repolishing, thus extending the service life and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional drilling tip with a hemispherical distal end portion is used, then the tip can be easily manufactured and attached, but the distal end portion becomes worn significantly over time, reducing service life and boring efficiency
Solution Approach 1:
The drilling tip is segmented into a tip main body and a separate projection portion that protrudes from the distal end. The projection portion is designed to be replaceable or repolishable independently, allowing the wear to be concentrated on this smaller component rather than the entire tip, thereby extending the overall service life while maintaining ease of manufacture for the main body
Solution Approach 2:
The projection portion at the distal end is given a specific geometric shape with optimized local properties (smaller radius of curvature, protruding structure) compared to the rest of the tip main body. This local structural differentiation causes wear to concentrate on the projection portion, which can be maintained or replaced without affecting the entire tip, thus extending service life
2Duration of action of moving object
If the distal end portion of the tip main body is made larger to maintain boring efficiency, then the service life is extended, but the wear spreads in a belt shape causing diameter reduction and requiring complete replacement
Solution Approach 1:
The tip is divided into a larger tip main body that maintains boring efficiency and a smaller projection portion that concentrates wear. When wear occurs, only the projection portion needs to be addressed (repolished or replaced), preventing the need to replace the entire tip and reducing material loss
Solution Approach 2:
The wear-prone distal end feature is extracted as a separate projection portion that can be independently maintained. This extraction allows the wear to be isolated to a small component, preventing belt-shaped wear from spreading across the entire tip diameter and reducing overall material loss
3Measurement precision
If a gauge tip is used to maintain precise boring diameter, then the boring precision is improved, but the extensive contact with boring wall surface causes prominent belt-shaped wear and frequent maintenance
Solution Approach 1:
The gauge tip is designed with a segmented structure where the projection portion at the distal end is separated from the main body. This segmentation allows the projection to be repolished or replaced independently, reducing maintenance frequency while maintaining the precise gauge function of the tip
Solution Approach 2:
The projection portion has locally optimized geometry with a smaller radius of curvature and protruding structure that concentrates wear. This local differentiation protects the main gauge body from belt-shaped wear, maintaining boring precision while reducing maintenance requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively curbs wear progression and maintains boring efficiency by extending the service life of the tip main body, allowing for economical and efficient boring by focusing wear on the projection portion, which can be repolished separately from the rest of the tip.
Implementation Method 1
wear of the distal end portion of the tip main body becomes prominent at the furthest protruding apex portion on a distal end side of a tool main body which comes into strong contact with bedrock
Implementation Method 2
a projection portion extending in a diameter direction with respect to a center line of the base end portion viewed from the distal end side of the tip main body and further protruding to the distal end side from a surface of the curved convex surface-shaped portion
Data Source
AI summary
A drilling tip that is attached to a distal end surface of a tool main body of a drilling tool which is rotated around an axis and in which a striking force is applied to a distal end side in a direction of the axis. The drilling tip includes a tip main body in which a base end portion having a columnar shape and a distal end portion protruding from this base end portion to the distal end side are integrally formed. The distal end portion includes a curved convex surface-shaped portion protruding to the distal end side of the tip main body, and a projection portion protruding to the distal end side from a surface of the curved convex surface-shaped portion.