Bellows Seal Structure for Wire EDM Sludge Removal
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Solution Overview
Problem
Existing sealing devices for wire electrical discharge machines face issues with sludge accumulation on guide rail members, which can hinder the expansion and contraction of bellows members, leading to potential sealing failures.
Innovation Solution
The sealing device incorporates a guide rail member with an inward side opening to allow sludge to flow into the work pan alongside the working fluid, or uses a support rod to direct the fluid flow from below the bellows member, preventing sludge accumulation between the bellows and seal plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a guide rail member is provided to guide the bellows member, then the bellows member can expand and contract smoothly, but sludge accumulates on the guide rail member and may hinder its operation
Solution Approach 1:
The harmful sludge is extracted from the sealing space by introducing a flow path that directs working fluid to carry sludge away from the guide rail member and bellows member, preventing accumulation while maintaining smooth operation
Solution Approach 2:
Hydraulic flow of working fluid is utilized to transport sludge away from the guide rail member. The flow path introduces pressurized working fluid that carries sludge particles away from critical components, solving the accumulation problem through fluid dynamics
2Reliability
If the guide rail member is completely enclosed, then sealing is improved, but sludge cannot be removed and accumulates on the guide rail member
Solution Approach 1:
The guide rail member structure is segmented with openings that allow selective passage. The guide rail member includes openings that permit sludge removal while maintaining sealing function, dividing the structure into regions that serve different purposes
Solution Approach 2:
Working fluid acts as an intermediary medium that carries sludge away from the guide rail member. The fluid mediates between the sealed environment and sludge removal, transporting contaminants without compromising the sealing function
3Reliability
If sludge accumulates on the guide rail member, then the bellows member expansion and contraction is hindered, leading to sealing failure
Solution Approach 1:
Sludge removal action is performed preliminarily by introducing working fluid flow before sludge can accumulate to harmful levels. The flow path continuously prevents sludge buildup, maintaining bellows member operation efficiency and sealing function
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
This design effectively prevents sludge stagnation and accumulation, ensuring smooth operation and maintenance of the sealing device by ensuring the bellows can expand and contract freely.
Implementation Method 1
A flow path is configured to allow the working fluid having a pressure higher than a pressure inside the work pan to be supplied between the bellows member and the seal plate
Data Source
AI summary
A sealing device and a wire electrical discharge machine that may reduce sludge deposition, include a seal base, a seal plate, a bellows member, a flow passage, and a guide rail member. The guide rail member is open on the inward direction side thereof to cause sludge generated by machining of an object to be machined to flow into a machining tank along with a machining liquid supplied between the bellows member and the seal plate.