Detachable Reaming Cutter With Oil-Storing Guide for Precise Hole Finishing
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Solution Overview
Problem
Conventional hole finishing tools face challenges in achieving high precision due to insufficient rigidity, particularly when used with handheld tools, and excessive use of expensive materials like cemented carbide, which complicates the process and requires continuous lubrication oil supply to manage friction and thermal expansion.
Innovation Solution
A hole finishing tool comprising a reaming cutter and a holder with a detaching structure for cutting oil flow paths, a sliding portion with no back taper for reduced friction, and concave portions for storing lubrication oil, allowing for precise hole finishing without relying on high spindle rigidity and minimizing expensive material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reamer is made of cemented carbide to secure high rigidity and processing accuracy, then manufacturing precision is improved, but device complexity and material cost increase
Solution Approach 1:
The reamer is divided into a holder body and detachable cutting edges. The holder can be made of simpler, less expensive material while the cutting edges use cemented carbide only where needed for cutting, reducing overall material complexity while maintaining precision at the cutting interface.
Solution Approach 2:
Cemented carbide material is applied locally only to the cutting edges where high precision and rigidity are critical, rather than the entire tool. This allows high manufacturing precision at the functional interface while reducing overall device complexity and material cost.
2Loss 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 tools
Solution Approach 1:
The tool is segmented into a rigid holder body and detachable cutting edges. The holder provides the necessary rigidity structure while the cutting edges are exchanged as needed, allowing reduced cemented carbide usage overall while maintaining precision through the rigid holder structure.
Solution Approach 2:
The holder acts as an intermediary between the handheld tool and the cutting edges. It provides a rigid interface that compensates for the insufficient rigidity of handheld tools, ensuring finishing accuracy is maintained even when using exchangeable cutting edges with less cemented carbide.
3Reliability
If lubrication oil is continuously supplied from the inside of the drill to the clearance between the drill and positioning bush, then friction and thermal expansion are managed, but lubrication oil scatters before the discharge port is inserted into the positioning bush
Solution Approach 1:
The lubrication oil supply function is extracted from the internal drill flow path and relocated to an external supply system. This allows lubrication oil to be supplied directly to the positioning bush clearance without passing through the drill interior, preventing scattering while maintaining friction and thermal management.
Solution Approach 2:
A dedicated lubrication oil supply path acts as an intermediary system, delivering lubrication oil directly to the clearance between the tool and positioning bush without using the drill's internal flow path. This eliminates the scattering problem while maintaining effective lubrication for friction and thermal management.
4Object-generated harmful factors
If a newly supply path dedicated for lubrication oil is created to supply lubrication oil from the outside into the inside of the positioning bush, then lubrication oil scattering is prevented, but device complexity increases
Solution Approach 1:
The holder structure is designed to serve multiple functions: it holds the cutting edges, provides rigidity, and incorporates the lubrication oil supply path. By integrating the lubrication function into the existing holder structure rather than adding a separate external system, device complexity is minimized while preventing lubrication oil scattering.
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 and simplified structure, maintaining accuracy even with handheld tools by using lubrication oil stored in concave portions to reduce friction and prevent clogging, while allowing for deeper hole completion with improved processing accuracy.
Implementation Method 1
The sliding portion has a concave portion for storing lubrication oil
Implementation Method 2
The first flow path for ejecting cutting oil is formed inside the reaming cutter
Implementation Method 3
The second flow path for supplying the cutting oil to the first flow path is formed inside the holder
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
Reaming cutter (2) mounted to a holder (3). The reaming cutter (1) has a male screw (5C). A first flow path (8A) for cutting oil is formed inside the reaming cutter (2). The holder (3) has a female screw (5D) for receiving the male screw (5C) of reaming cutter (2). A second flow path (8B) for supplying the cutting oil to the first flow path (8A) is formed inside the holder (2). The holder has a shank (6) for being held by a tool rotating device (20). The holder has a sliding portion (9) for cooperating with a guide bush (4).The sliding portion (9) is inserted into the positioning bush (4) and held slidingly. The sliding portion (9) has a concave portion (10) for storing lubrication oil.