Rotating Chisel Wear Disc Anti-Twist Groove Design
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Solution Overview
Problem
Milling tool arrangements face challenges in ease of assembly and maintenance due to high wear and tear from abrasive soil materials, particularly affecting the stop surface of the bit holder, which is not adequately addressed by existing wear disc solutions.
Innovation Solution
A cutting tool arrangement with a wear disc that features grooves or indentations on its outer circumference engaging with guides on the chisel holder, providing a positive-locking mechanism for anti-twist protection, along with a base area for support and edge protection, and a collar for centering, enhancing assembly and maintenance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wear disk is arranged between the stop surface and the cutting tool head, then wear on the stop surface is reduced, but assembly and maintenance complexity increases
Solution Approach 1:
The wear disk is designed as a separate, removable component positioned between the stop surface and the cutting tool head. This segmentation allows the wear disk to be easily replaced when worn, while the stop surface remains protected from direct contact with abrasive materials. The guide elements and grooves are integrated into the wear disk and holder assembly, enabling modular replacement without replacing the entire holder.
Solution Approach 2:
The wear disk acts as an intermediary component that transfers the wear from the stop surface to itself. By placing the wear disk between the stop surface and the cutting tool head, it mediates the contact with abrasive soil materials, protecting the stop surface from direct wear while allowing the wear disk to be replaced independently.
2Duration of action of stationary object
If a wear disk is used to protect the stop surface, then tool life is extended, but manufacturing cost increases
Solution Approach 1:
The wear disk is designed as a consumable component that can be easily replaced when worn. Rather than making the entire holder expensive and complex, the wear disk itself is the cost-effective solution that absorbs the wear. This allows the stop surface and holder to be manufactured at lower cost while the wear disk serves as the sacrificial protective element.
3Reliability
If the wear disk is made rotatable, then wear distribution improves, but anti-twist protection is compromised
Solution Approach 1:
The wear disk is designed with a specific geometric relationship between its grooves and the guide elements on the holder. The grooves are oriented such that they engage with the guides to prevent rotation, while the disk itself can still be replaced as a unit. This dynamic design allows the wear disk to remain stationary during operation for anti-twist protection while maintaining the ability to be removed and replaced for maintenance.
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3c
AI summary
The arrangement (100) has a chisel holder (10) fastened or fixed to a milling drum. A milling bit (20) is secured in a hole of the holder, and rotates around a longitudinal axis. An anti-swiveling wear plate (30) is arranged between a stop surface of the holder and a milling bit head (21) of the bit. An anti-twist plate is arranged between the wear plate and the holder through a groove (31) formed in an external periphery of the wear plate. An intervening guide channel (11) formed at the holder is inserted into the groove. The wear plate is made of a spring steel material.