Spindle Cooling Flow Passage with Opposing Spiral Grooves
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Solution Overview
Problem
Spindle devices face issues with cooling medium leakage at rotary joints due to fluid pressure changes during acceleration and deceleration, leading to insufficient cooling medium supply and potential thermal expansion or bearing failure.
Innovation Solution
A spindle device with a cooling flow passage featuring a first spiral portion and a second spiral portion extending in opposite directions, which cancel out fluid pressures during acceleration and deceleration, ensuring reliable medium supply and minimizing leakage through continuous spiral grooves and seal portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single spiral cooling flow passage is used to improve cooling efficiency, then the cooling medium flow rate increases, but fluid pressure builds up during acceleration and deceleration causing leakage at rotary joints
Solution Approach 1:
The single spiral cooling flow passage is divided into two separate spiral passages with opposite spiral directions. Each passage handles fluid pressure in opposite directions, canceling out the net pressure buildup during acceleration and deceleration, thereby preventing leakage while maintaining cooling efficiency
Solution Approach 2:
Two spiral passages with opposite spiral directions (one clockwise, one counterclockwise) are created to produce asymmetric fluid pressure responses that cancel each other out. This asymmetric design allows the system to handle dynamic pressure changes during acceleration and deceleration without causing leakage
2Temperature
If cooling medium flow rate is increased to improve cooling effect, then heat removal efficiency improves, but fluid pressure increases causing reverse flow and insufficient medium supply
Solution Approach 1:
The two spiral passages act as counterbalancing systems where the fluid pressure generated in one passage during acceleration opposes the pressure in the other passage. This counterbalancing effect prevents net pressure buildup that would cause reverse flow, ensuring sufficient cooling medium supply is maintained even at high flow rates
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 dual spiral design effectively suppresses coolant leakage and ensures a consistent cooling medium supply, enhancing machining accuracy and preventing thermal issues by maintaining fluid pressure balance during spindle rotation.
Implementation Method 1
a fluid pressure may be produced by the axial-flow pumping action during acceleration and deceleration
Data Source
AI summary
A spiral groove flow passage with a clockwise spiral direction and a spiral groove flow passage with a counterclockwise spiral direction are provided inside a spindle. When the spindle is accelerated to rotate in the forward rotation direction, a pressure in the direction of causing a reverse flow of a coolant is applied to the left-hand spiral groove flow passage by the axial-flow pumping action, but a pressure in the forward direction is applied to the right-hand spiral groove flow passage by the same axial-flow pumping action to cancel out the pressure causing the reverse flow described above.