Chisel Holder Dual Convex Contact Surface Stress Distribution
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Solution Overview
Problem
Existing chisel holders for soil cultivating machines, such as road milling machines, face issues with stress distribution during machining operations, leading to wear and potential loss of secure hold, especially when handling hard materials like concrete, resulting in premature base part replacement and increased maintenance costs.
Innovation Solution
The chisel holder features two convex contact surfaces arranged at a distance, creating a statically determined clamping system that allows for reliable support and re-tensioning, even with wear, and a pressure surface positioned to optimize force distribution, enabling symmetrical and stress-optimized force dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single convex contact surface is used in the plug-in attachment, then the structure is simple, but the stress distribution is uneven and secure hold is not guaranteed under high alternating loads
Solution Approach 1:
The single contact surface is segmented into two convex contact surfaces arranged at a distance from each other on the plug-in attachment. This segmentation distributes the clamping force across multiple contact points, improving stress distribution and securing the connection under alternating loads while maintaining structural simplicity
2Manufacturing precision
If the chisel holder is fixed rigidly in the base part, then positioning is precise, but wear on mating surfaces causes loss of secure hold and requires base part replacement
Solution Approach 1:
The clamping system is made adjustable rather than rigid. The pressure screw can be retensioned to compensate for wear on the mating surfaces between the chisel holder and base part. This dynamic adjustment capability maintains positioning precision throughout the service life without requiring base part replacement
3Stability of the object's composition
If transverse forces are transmitted through the plug-in attachment with pentagonal cross-section, then the structure is stable, but multiaxial stress state including torsional stresses occurs
Solution Approach 1:
The pentagonal cross-section is replaced with a round cross-section for the plug-in attachment. This curved geometry eliminates stress concentrations at corners and reduces torsional stresses while maintaining structural stability. The rounded form distributes multiaxial stresses more evenly throughout the component
Data Source
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AI summary
The invention relates to a chisel holder for a ground processing machine, in particular a road miller, comprising a supporting member to which a plug-in attachment is indirectly or directly connected at a plug-in attachment end. The plug-in attachment has at least one convex contact surface and a pressure surface. In order to deflect the processing forces in such a chisel holder in an optimized manner with respect to the load conditions, the plug-in attachment has two convex contact surfaces that are located at a distance from each other.