Chisel Holder Wear Protection Using Recessed Weld Overlay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing chisel holders face high production costs and manufacturing challenges due to the use of hard metal materials, which are brittle and require precise alignment and soldering, leading to increased energy consumption and potential breakage, while existing wear protection methods either increase costs or negatively affect tool performance.
Innovation Solution
A chisel holder with a recessed weld as a wear protection element, where the weld is introduced into a groove or radial grooves set back from the chisel support surface, allowing for easy manufacturing and adjustable wear resistance using conventional welding processes, without affecting the chisel's support surface or tool function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbide rings are brazed to the chisel holder, then wear protection is improved, but manufacturing costs increase and thermal stresses are introduced
Solution Approach 1:
The patent replaces expensive, difficult-to-manufacture carbide rings with a cheaper weld overlay that can be applied more easily. The weld material serves as a disposable wear protection layer that can be replenished or replaced without complex brazing operations, reducing both material costs and manufacturing complexity.
Solution Approach 2:
The patent changes the material application method from brazing (high temperature, complex process) to welding (controlled temperature, simpler process). This parameter change in the joining process eliminates thermal stresses associated with brazing while maintaining wear protection functionality.
2Reliability
If carbide rings are brazed to the chisel holder, then wear protection is improved, but thermal stresses and brittleness lead to breakage
Solution Approach 1:
The weld overlay serves as a sacrificial wear protection layer that can be worn down and replenished without compromising the structural integrity of the chisel holder. This eliminates the risk of brittle carbide ring breakage while maintaining continuous wear protection.
Solution Approach 2:
The patent uses a composite structure where a weld overlay (wear-resistant material) is applied to the chisel holder surface. This composite approach combines the toughness of the holder material with the wear resistance of the weld material, avoiding the brittleness issues of solid carbide components.
3Reliability
If armor coating is applied to the chisel support surface, then wear protection is improved, but the surface becomes non-planar and affects chisel rotational behavior
Solution Approach 1:
The patent applies wear protection only in specific localized areas through welding, rather than coating the entire surface. This allows the chisel support surface to remain planar and perpendicular to the central longitudinal axis where needed, while providing enhanced wear resistance in high-wear zones without affecting chisel rotational behavior.
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 solution provides effective wear protection with adjustable wear properties, reducing manufacturing effort and costs, while ensuring the chisel holder's precise support and long service life, with the weld becoming active only after initial wear, allowing for extended tool operation and easy identification of wear marks.
Implementation Method 1
The weld is formed from a welding filler material that can be introduced into the recess using a conventional welding process
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a chisel holder (20) for a cutting machine, road milling machine, surface miner, or the like, having a chisel receptacle (29), which comprises an insertion opening, and having a chisel supporting surface (26), wherein at least one wear protection element (40) is arranged in an area associated with the chisel supporting surface. In order to bring about effective wear protection in such a chisel holder at low cost, it is provided that the at least one wear protection element is designed as a weld (40) and is arranged at least in areas in at least one opening (41).