Hole Finishing Tool with Oil-Storing Sliding Guide for Precision Reaming
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Solution Overview
Problem
Conventional hole finishing tools face challenges in achieving high precision due to insufficient rigidity, especially when used with handheld tools, and require continuous lubrication oil supply to manage friction and thermal expansion, which complicates the structure and increases material usage.
Innovation Solution
A hole finishing tool comprising a reaming cutter and a holder with a detaching structure for cutting oil flow paths, where the holder has a sliding portion with no back taper and a concave portion for storing lubrication oil, allowing for precise hole finishing regardless of spindle rigidity and reducing expensive material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If exchange-type cutting edges are used to reduce cemented carbide usage, then material cost is reduced, but finishing accuracy deteriorates due to insufficient rigidity of handheld tool rotating devices
Solution Approach 1:
The tool is divided into a holder and exchangeable cutting edges, allowing the holder to be made of inexpensive high-speed steel while only the cutting edges require expensive cemented carbide. This segmentation enables cost reduction while maintaining cutting performance.
Solution Approach 2:
A positioning bush with a sliding portion is introduced as an intermediary component to guide the reaming cutter. This positioning mechanism compensates for the low rigidity of handheld tool rotating devices, ensuring high finishing accuracy even when using exchangeable cutting edges with a less rigid holder.
2Manufacturing precision
If positioning bush is used to guide the tool for high precision hole processing, then manufacturing precision is improved, but device complexity increases due to required lubrication oil supply paths and scattering prevention structures
Solution Approach 1:
The lubrication oil supply function is merged into the existing cutting oil flow path. The cutting oil flows through the reaming cutter and holder, and a portion is discharged into the positioning bush to lubricate the sliding portion. This eliminates the need for separate lubrication oil supply paths and scattering prevention structures, reducing device complexity while maintaining high precision.
3Stability of the object's composition
If back taper is provided on the sliding portion, then thermal expansion is compensated, but friction increases requiring continuous lubrication oil supply
Solution Approach 1:
A concave portion is provided on the sliding portion to store lubrication oil in advance. This stored lubrication oil is gradually released to maintain lubrication between the sliding portion and positioning bush, reducing friction and allowing the use of a simple cylindrical sliding portion without back taper, thereby compensating for thermal expansion without requiring complex continuous lubrication systems.
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 tool enables high-precision hole finishing with reduced material costs by using inexpensive materials for the holder and allowing for exchangeable cutting edges, while maintaining accuracy and reducing friction through lubrication oil stored in the concave portion, even with handheld tools.
Implementation Method 1
The sliding portion has a concave portion for storing lubrication oil
Implementation Method 2
The reaming cutter has a first flow path for ejecting cutting oil. The holder has a second flow path for supplying the cutting oil to the first flow path
Data Source
AI summary
According to one implementation, a hole finishing tool includes a reaming cutter and a holder. The reaming cutter has a first detaching structure. The first flow path for ejecting cutting oil is formed inside the reaming cutter. The holder has a second detaching structure. The second detaching structure is detached from and attached to the first detaching structure. The second flow path for supplying the cutting oil to the first flow path is formed inside the holder. The holder has a shank. The shank is held by a tool rotating device. The holder has a sliding portion. The sliding portion has no back taper. The sliding portion is inserted into a positioning bush and slid inside the positioning bush. The sliding portion has a concave portion for storing lubrication oil.