Retention for Holder Shank With Recessed Bore
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Solution Overview
Problem
Existing tools used in formation degradation processes, such as asphalt milling and mining, face wear issues due to inefficient mounting and removal mechanisms, leading to frequent tool replacement and maintenance challenges.
Innovation Solution
A tool holder with a shank featuring a longitudinal central bore and recesses on both inner and outer surfaces, allowing for a press-fit interference with a block and enabling easy installation and removal, while maintaining a secure fit during operation, using a combination of recess geometries and a taper for enhanced compliancy and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a press-fit interference mounting is used to secure the holder in the block, then the holder is retained securely during high-impact operations, but the tool becomes difficult to remove and replace
Solution Approach 1:
The shank is segmented with multiple recesses (first recess, second recess, third recess) at different locations and orientations. These recesses create localized compliance zones that allow the shank to deform elastically under impact loads, enabling secure retention while still permitting tool removal when force is applied.
Solution Approach 2:
The recesses change the mechanical parameters of the shank by creating compliance zones with different stiffness characteristics. The varying depths and positions of recesses allow the shank to exhibit non-linear elastic behavior, becoming more compliant under high impact forces while maintaining sufficient rigidity for secure mounting.
2Strength
If a solid shank design is used to maintain structural integrity during high-impact operations, then the holder can withstand formation degradation forces, but the shank becomes prone to wear and stress concentration
Solution Approach 1:
The shank features non-uniform local quality through recesses of varying depths and positions. The first recess at the distal end, second recess at the proximal end, and third recess on the outer surface create localized zones with different mechanical properties, allowing stress distribution and wear resistance without compromising overall structural integrity.
3Ease of manufacture
If a simple cylindrical shank is used for easy manufacturing, then production is simplified, but the holder lacks compliance for secure interference fit and easy removal
Solution Approach 1:
The shank is divided into multiple recesses rather than using a simple cylindrical design. This segmentation provides compliance for secure interference fit while maintaining manufacturability through standard machining operations.
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 recessed tool holder design enhances the ease of tool installation and removal, reduces wear, and ensures a secure, high-impact resistant mounting, facilitating efficient operation and reducing maintenance needs.
Implementation Method 1
The at least one recess may extend along at least a portion of the shank of the holder... The recesses of the inner surface may have a distance between recesses less than a distance between recesses of the outer surface... In some embodiments, the inner or outer surface of the shank may comprise a taper.
Data Source
AI summary
In one aspect of the present invention, a degradation assembly has a holder comprising a first end and a second end and a shank with a longitudinal central bore having an opening at an end proximate the second end. The shank portion of the holder has an inside diameter of the bore and an outside diameter wherein either the inner diameter or the outer diameter comprise at least one recess disposed therein which comprises a depth of less than the distance between the inner diameter and the outer diameters.