Road Planing Tool Bit Retaining Teeth Bonding
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Solution Overview
Problem
Existing road planing tools suffer from the tool bit coming loose during operation due to inadequate bonding with the tool holder, leading to premature wear and increased maintenance costs, as the weld is prone to failure under pressure.
Innovation Solution
A toothed structure is implemented, where the tool bit's retaining teeth engage with a toothed inner rim on the tool holder, enhancing the bonding strength and preventing the tool bit from detaching, combined with an expandable sleeve for easy replacement and even wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If weld is applied to the boundary between the tool bit and assembling socket, then the tool bit is fixed to the tool holder, but the weld is prone to failure under pressure causing the tool bit to come loose
Solution Approach 1:
The assembling socket is segmented into a body portion and a toothed inner rim portion, with the toothed inner rim forming interlocking teeth that engage with corresponding teeth on the tool bit. This segmentation creates multiple discrete bonding points along the circumference, distributing the load and preventing loosening that would occur with a single weld boundary.
Solution Approach 2:
The connection mechanism combines mechanical interlocking (toothed structure) with material bonding (welding) to create a composite connection system. The toothed inner rim and tool bit teeth provide mechanical engagement, while welding reinforces the bonds at the tooth interfaces, creating a multi-mechanism connection that is more reliable than welding alone.
2Strength
If the tool bit is made of costly hardened material, then the tool bit can withstand wear, but the tool bit is still prone to detaching from the tool holder
Solution Approach 1:
The tool bit is segmented with circumferential teeth that engage with the toothed inner rim of the assembling socket. This segmentation creates multiple mechanical bonding points around the tool bit, distributing the attachment forces and preventing detachment even under the high pressures of road planing operation, thereby ensuring reliable attachment for the hardened material tool bit.
3Device complexity
If a simple assembling socket is used, then the tool holder structure is simple, but the tool bit can easily come off during operation
Solution Approach 1:
The assembling socket has a toothed inner rim portion with teeth specifically configured to engage with tool bit teeth, creating localized mechanical interlocking at the critical interface. This local quality enhancement at the bonding interface provides reliable tool bit retention without requiring complex modifications to the entire holder structure, maintaining simplicity while improving reliability.
Data Source
AI summary
A road planing tool includes a tool holder having a front end thereof formed with an assembling socket, and a tool bit being in a cone-like shape and having a tip and a bottom, wherein the bottom is configured to be fittingly inlaid in the assembling socket. The road planing tool is characterized in that: the bottom of the tool bit has a plurality of projecting retaining teeth, and the assembling socket is peripherally formed with a toothed inner rim correspondingly, wherein fittingly engagement between the retaining teeth and the toothed inner rim allows the tool bit to be firmly combined with the tool holder.