Spindle Bore Refinishing Tool for Tapered Surface Precision
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Solution Overview
Problem
Machine tools face issues with maintaining precise tolerances due to relative movement between spindle and tool holder, caused by imperfections and wear in the tapered surfaces, leading to machining errors and reduced tool life.
Innovation Solution
A spindle bore refinishing tool with self-adhesive abrasive strips of varying grits is used to progressively refine the spindle bore and tool holder surfaces, ensuring full contact and maintaining precise tolerances without the need for expensive re-machining or replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tapered shank of the tool holder is not in full contact with the spindle socket, then relative movement occurs under heavy machining, but maintaining full contact requires precise surface integrity which deteriorates due to wear and imperfections over time
Solution Approach 1:
The invention changes the surface parameters of the tapered shank by applying abrasive strips with progressively finer grits to restore the surface finish. This process transforms the degraded surface parameters back to original specifications, ensuring full contact with the spindle socket and maintaining manufacturing precision without requiring replacement of the tool holder.
Solution Approach 2:
The invention uses disposable abrasive strips that are applied to the tapered shank surface. These strips are consumed during the refinishing process and discarded after use, providing a low-cost solution to restore surface precision compared to replacing the entire tool holder or spindle assembly.
2Manufacturing precision
If the tapered surfaces are refinished using traditional machining methods, then precision can be restored, but the cost of re-machining or replacement becomes prohibitively expensive
Solution Approach 1:
The invention employs inexpensive abrasive strips as the refinishing medium. These disposable strips can be applied directly to the tapered shank surface using a simple applicator, eliminating the need for expensive CNC machining operations or replacement of precision components. The low cost of the abrasive strips makes this a economically viable solution for restoring manufacturing precision.
Solution Approach 2:
The invention extracts the essential refinishing function from complex machining operations and concentrates it into a simple abrasive application process. By removing the need for sophisticated machining equipment and procedures, the solution dramatically reduces refinishing costs while maintaining the ability to restore tapered surface precision.
3Manufacturing precision
If abrasive strips are applied to the tapered segments, then the spindle bore and tool holder surfaces are refinished to original specifications, but the process requires multiple steps with different grits and inspection cycles
Solution Approach 1:
The invention segments the refinishing process into distinct stages using abrasive strips of different grits (coarse, medium, fine). Each segment addresses specific surface conditions, allowing systematic restoration of the tapered surface from rough to precision finish. This segmented approach, while multi-step, provides a structured methodology that ensures consistent results.
Solution Approach 2:
The abrasive strips are self-adhering and can be easily applied and removed by the operator without specialized equipment. The inspection process is self-service, where the operator directly observes the wear pattern on the abrasive strips to determine when the refinishing is complete, eliminating the need for complex measurement and inspection equipment.
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 method effectively refinishes spindle bores and tool holder surfaces to original specifications, maintaining machining tolerances and extending tool life by ensuring intimate contact and preventing wear, thus avoiding costly replacements.
Implementation Method 1
the abrasives carried by the tapered segments engage the tapered surface of the tool holder so that rotation of the refinishing head abrades the tapered surface of the tool holder
Data Source
AI summary
An apparatus and method for refinishing a tapered surface of a machine tool component. The apparatus includes a head defining at least three tapered segments which are configured to conform precisely to the taper of the machine tool component being refinished. Each segment includes a surface for receiving an abrasive strip, the surfaces configured to conform and confront a conical surface of a taper to be refinished. The head is adapted to engage the tapered surface of the machine tool component so that upon rotation of the head, the abrasive strips abrade the conical surface of the component. A head for refinishing a spindle bore includes three outwardly extending segments whereas the head for refinishing a tool holder shank surface includes three segments extending between annular portions, each segment having an inner tapered surface for receiving the abrasive strips.