Rotatable Cutting Tool Holder Base Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mining and road milling machines face challenges with the wear and damage of cutting bit holders and support blocks due to exposure to cutting debris, leading to premature failure and costly replacement, as well as difficulties in disassembly under severe operating conditions.
Innovation Solution
A tool holder-base assembly with a secure mounting system that includes a base with a tool holder bore and orientation bore, a tool holder with a leading head region and shank region, and a coolant passage, facilitating correct orientation, debris diversion, and easy disassembly, while resisting vibratory loosening and extending the useful life of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cutting bit holders are mounted in support blocks using conventional welding or mechanical connections, then the cutting bits can be securely held during operation, but the support blocks become difficult to disassemble and repair when worn or damaged
Solution Approach 1:
The support block is divided into multiple segments or sections that can be separated from each other. The cutting bit holder is mounted in one segment that can be independently removed, allowing repair without disassembling the entire support block structure. This segmentation enables localized maintenance while maintaining overall structural integrity during operation.
Solution Approach 2:
The cutting bit holder is extracted as a separate, removable component from the support block. Instead of permanently welding or firmly mechanically connecting the holder to the block, a removable mechanical connection is used, allowing the holder to be taken out for replacement or repair without damaging or disassembling the support block itself.
2Reliability
If cutting bit holders are firmly mounted to minimize movement, then cutting bit wear is reduced, but vibratory loosening occurs under severe operating conditions
Solution Approach 1:
The mounting structure incorporates preliminary anti-loosening features such as pre-loaded mechanical locks, spring-loaded retention mechanisms, or orientation pins that engage before vibration occurs. These features are built into the design to prevent vibratory loosening from the outset, maintaining secure mounting throughout the severe operating conditions without requiring frequent adjustment or tightening.
3Duration of action of stationary object
If support blocks are designed for durable mounting, then component life is extended, but replacement time and cost increase when blocks become ineffective
Solution Approach 1:
The support block system is segmented into modular sections with standardized interfaces. When one section becomes worn or damaged, only that specific segment needs to be replaced rather than the entire block assembly. This modular segmentation reduces replacement time and allows for quicker maintenance operations while maintaining durable construction in each segment.
Solution Approach 2:
The support block design incorporates universal mounting interfaces and standardized dimensions that allow the same block design to be used in multiple positions and applications. This universality enables quick replacement using identical or interchangeable components, reducing downtime and inventory requirements while maintaining durable, proven designs throughout the system.
Data Source
AI summary
A cutting tool holder-base assembly (399) has a base (400). The base (400) is adapted to attach to a surface (40) of a rotatable driving member (38). The tool holder-base assembly (399) includes a cutting tool holder (500) with head region (502) containing a cutting tool bore (506), and a shank region (504) with a distal end (524). The shank region (504) has an alignment notch (528) presenting an alignment surface (530) at the distal end (524). The assembly (399) further has a base (400), which contains a tool holder bore (418) and a transverse passage (430) intersecting the tool holder bore (418). There is an elongate pin (436) in the transverse passage (430). The elongate pin (436) has an exposed portion (440) thereof passing through the tool holder bore (418) wherein the cutting tool holder (500) is able to enter completely the tool holder bore (418) of the base (400) when the alignment surface (530) is in alignment with the exposed portion (440) of the elongate pin (436).