Fluted Drill Bit with Shroud for Damage-Free Concrete Sample Removal
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Solution Overview
Problem
Concrete samples are difficult to remove from molds without damage due to vacuum resistance, leading to potential cracks and inaccurate compression test results when traditional methods like drilling and air pressure are used.
Innovation Solution
A method and device involving a fluted drill bit with a flat tip and a shroud to perforate the mold base while simultaneously introducing pressurized air, which impinges on the sample to lift it out without direct contact, using a jig for orientation-specific support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional drilling and air pressure methods are used to remove concrete samples from molds, then the samples can be removed from the mold, but the samples may suffer damage such as cracks due to direct contact with the drill bit
Solution Approach 1:
The patent introduces a fluid intermediary (air or water) between the drill bit and the concrete sample. The fluid is forced through the drill bit's internal passage and exits through peripheral openings to impinge on the sample, creating pressure that lifts the sample away from the drill bit, preventing direct contact and potential damage while still enabling effective mold removal.
2Productivity
If the mold base is perforated with a drill bit to break the vacuum, then the concrete sample can be removed, but the drill bit may cause detrimental propagating cracks that lead to skewed compression test results
Solution Approach 1:
The fluid intermediary is forced through the drill bit and exits through peripheral openings to create a cushion of pressurized fluid between the drill bit and the concrete sample. This prevents the drill bit from directly contacting and potentially cracking the sample, while still effectively breaking the vacuum seal and enabling mold removal.
Solution Approach 2:
The patent utilizes pneumatic or hydraulic principles by forcing fluid through the drill bit's internal passage and peripheral openings. The pressurized fluid creates a lifting force that separates the sample from the mold base and drill bit, enabling efficient removal without mechanical contact that could cause cracks.
3Object-affected harmful factors
If a fluted drill bit with fluid introduction is used to perforate the mold base, then the sample can be removed without direct contact, but the device complexity increases
Solution Approach 1:
The drill bit is designed with multi-functionality: it performs both the traditional drilling function to perforate the mold base and the additional function of introducing and directing fluid to protect the sample. The fluted structure with internal passage and peripheral openings combines cutting, fluid transport, and sample protection functions in a single component.
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
Enables simple, directional, and damage-free removal of concrete samples from molds, minimizing the risk of cracks and ensuring accurate compression test results.
Implementation Method 1
simultaneously forcing fluid, such as air, around and/or through the drill bit; whereby, upon perforation of the closed end or base of the mold receptacle, the fluid immediately passes through the perforation and effectively impinges on a surface of the sample with sufficient pressurized force to move the sample away from the advancing drill
Implementation Method 2
the concrete tends to set and effectively adhere against the inner walls of the molds with a vacuum resistance (not necessarily a chemical bond) formed during removal
Data Source
AI summary
A method and device for removal of a molded sample from a mold with minimal or no damage to the molded sample. The device includes a drill configured for perforating a wall of the mold with the formation of a through aperture, a shroud passageway through or adjacent the drill, and a passageway from a source for pressurized fluid leading to the shroud passageway. The shroud passageway is configured whereby fluid such as air is applied therethrough simultaneously with perforation operation of the drill. Air directed through the aperture is pressurized and comes into effective contact with the molded sample whereby the molded sample is prevented from being more than minimally contacted with the drill and caused to be removed from the mold.