Rock Chiselling Drill Bit With Inclined Intake Passage
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Solution Overview
Problem
Conventional drill bits for chiselling rock face challenges in efficiently transporting drill cuttings away without a helical shank, which affects break-down performance and material removal efficiency.
Innovation Solution
A drill bit design featuring a hollow shank with a delivery passage, a drill head with inclined intake passages that minimize radial deflections, and cutting edges made of sintered tungsten carbide, allowing for effective chiselling and efficient removal of drill cuttings through a vacuum system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a helical shank is used to transport drill cuttings away, then material removal efficiency is improved, but device complexity increases and break-down performance deteriorates
Solution Approach 1:
The patent extracts the cuttings transport function from the helical shank structure by providing a separate hollow shank with an axial delivery passage. This allows the shank to serve dual purposes: structural support and cuttings removal, while eliminating the need for helical flutes that complicate the design.
Solution Approach 2:
The intake passage is segmented into two portions with different inclinations: a first portion with a smaller inclination (0-5 degrees) for break-down performance and a second portion with a larger inclination (15-30 degrees) for efficient cuttings transport. This segmentation allows each portion to optimize for its specific function.
2Productivity
If intake passages have steep inclination to improve cuttings transport, then material removal efficiency is improved, but break-down performance deteriorates due to radial deflections
Solution Approach 1:
The intake passage is divided into two segments with different inclination angles. The first portion (0-5 degrees) minimizes radial deflections to maintain break-down performance, while the second portion (15-30 degrees) maximizes cuttings transport efficiency. This segmentation resolves the contradiction by assigning different functional requirements to different segments.
Solution Approach 2:
The intake passage transitions from a nearly axial orientation (first portion) to a more radial orientation (second portion), utilizing dimensional change in the passage geometry to first preserve impact wave propagation and then efficiently convey cuttings to the delivery passage.
3Ease of manufacture
If cutting edges are made of softer material for easier manufacture, then ease of manufacture is improved, but strength and durability deteriorate
Solution Approach 1:
The drill head employs composite construction with a steel body providing structural integrity and a tungsten carbide cutting edge layer providing wear resistance and cutting performance. This composite approach allows each material to be optimized for its intended function while maintaining overall manufacturability through integrated construction.
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
The design enhances break-down performance and material removal efficiency by minimizing radial deflections and utilizing hard, durable cutting edges for effective rock chiselling while ensuring efficient transport of drill cuttings away from the drilling site.
Implementation Method 1
The shock wave of the impact passes through the hollow shank (4) in the impact direction (9) as far as the drill head (2)
Implementation Method 2
A vacuum cleaner is attached to the sleeve (8). The air stream draws in the drill cuttings at the intake openings (3) directly at the front end (12) of the drill bit (1)
Data Source
AI summary
A drill bit for chiselling rock includes an impact face at an insertion end of the drill bit, a hollow shank, where a delivery passage is defined within the hollow shank, and a drill head, where the drill head has a cutting edge, an intake opening, and an intake passage and where the intake passage connects the intake opening to the delivery passage. A first portion of the intake passage which adjoins the intake opening has a first inclination with respect to a drill bit axis, a second portion of the intake passage which adjoins the hollow shank has a second inclination with respect to the drill bit axis, and the second inclination is greater than the first inclination.