Chisel Holder Shank Curved Transition Reduces Stress
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Solution Overview
Problem
Existing chisel holders face challenges in optimally distributing and reducing loads on the fastening shank, leading to potential stress concentrations and increased risk of breakage during milling operations.
Innovation Solution
The chisel holder design features a fastening shank with inclined supporting surface regions that form a depression-like transition region, allowing for improved stress distribution and load reduction, while also enabling easier machining and precision in the supporting surface regions, which can be curved or protrude radially to adapt to loads and maintain symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flattened cross-sectional profile with planar supporting surface regions is used, then the structure is simple and easy to manufacture, but stress distribution is poor and load concentrations occur
Solution Approach 1:
The patent applies curvature by forming the transition region between supporting surface regions as a depression-like structure with curved surfaces, replacing the planar transition surface. This curved geometry distributes stresses more uniformly across the fastening shank, preventing stress concentrations while remaining manufacturable through standard machining operations.
2Ease of manufacture
If planar supporting surface regions are used, then machining is straightforward, but load distribution is suboptimal
Solution Approach 1:
The transition region is designed as a depression with curved surfaces that smoothly connect the inclined supporting surface regions. This curved geometry optimizes load distribution by eliminating sharp corners and edges where stress concentrations would occur, while the overall structure remains suitable for conventional machining processes.
3Device complexity
If the fastening shank has a simple geometric configuration, then manufacturing is easier, but adaptation to occurring loads is insufficient
Solution Approach 1:
The patent applies local quality by creating a depression-like transition region specifically at the location where supporting surface regions connect. This localized geometric modification optimizes stress distribution in the critical area without complicating the overall fastening shank geometry, maintaining ease of manufacture while improving load adaptation.
Data Source
AI summary
A chisel holder comprises a body zone (12) having a chisel receiving opening (18) that is open at least in the direction of a chisel insertion end (14) of the body zone (12), and also comprises a fastening shaft (26) which extends from a supporting end (20) of the body zone (12) and has a longitudinal shaft axis. A fastening member-affecting zone is provided on a first side of the fastening shaft (26), and a supporting zone (78) that has supporting surface regions (88, 90) which are inclined relative to each other and adjoin each other in a transition zone (92) extending in the direction of the longitudinal shaft axis is provided on a second side of the fastening shaft (26), said second side lying opposite the first side relative to the longitudinal shaft axis. Said chisel holder is characterized in that the transition zone (92) is designed like a cavity, or/and at least some sections of at least one supporting surface region (88, 90) project radially outward from a basic outer peripheral surface (94) of the fastening shaft (26) in relation to the longitudinal shaft axis.