Percussive Drill Bit Planar Front Face Sections
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Solution Overview
Problem
Existing percussive drill bits with curved front face surfaces experience uneven insert protrusion, leading to varying interference and increased steel wear, which reduces the service life of the drill bit.
Innovation Solution
A percussive rock drill bit design featuring a front face with multiple planar sections and gauge surfaces, each with inserts mounted evenly around the circumference, ensuring consistent interference and reduced wear by maintaining uniform protrusion heights and angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a curved axisymmetric front face surface is used, then the drill bit structure is simple and easy to manufacture, but the insert protrusion height varies around the circumference causing uneven interference and increased steel wear
Solution Approach 1:
The front face surface is divided into multiple planar sections (typically 3-5 sections) around the circumference instead of using a single curved surface. Each planar section provides a uniform reference surface for mounting inserts, ensuring consistent protrusion height and interference fit around the entire circumference, thereby reducing steel wear and improving insert retention.
2Device complexity
If inserts are mounted on a curved front face surface, then the drill bit can be manufactured with simple geometry, but the varying interference between inserts and holes leads to increased steel wear and reduced service life
Solution Approach 1:
The front face is segmented into multiple planar sections, each providing a uniform mounting surface for inserts. This segmentation ensures that all inserts have the same protrusion height and interference fit, preventing localized steel wear and extending the service life of the drill bit.
Solution Approach 2:
Each planar section on the front face is designed with specific local geometry to ensure uniform insert mounting. The planar surfaces provide consistent local conditions for insert installation, ensuring that interference and protrusion are uniform across all inserts, thereby preventing premature wear and failure.
3Ease of manufacture
If a curved front face surface is used, then manufacturing is simpler, but uneven insert protrusion causes variable interference leading to increased steel wear
Solution Approach 1:
By dividing the front face into multiple planar sections, each section can be manufactured with precise flatness to ensure uniform insert protrusion. The planar geometry of each section provides a stable reference surface that is easier to manufacture with high precision compared to maintaining uniform curvature across the entire front face.
Data Source
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AI summary
A percussive rock drill bit comprising an axially raised front face surrounded by at least one gauge surface wherein the front face has a plurality of front face sections wherein each front face section has a planar front surface; wherein the normal perpendicular to each of the planar front surfaces is non-parallel to the longitudinal axis and each of the planar front surfaces projects in different directions from the longitudinal axis; and wherein there is at least one front insert mounted on each of the front face sections.