High Pressure Coolant Tube Sealing for 500 Bar Backflow Prevention
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Solution Overview
Problem
Existing coolant tubes fail to deliver coolant at high pressures (e.g., 500 bar) without causing backflow contamination of the clamping unit assembly, limiting their effectiveness in metal cutting operations where excessive heat at the insert-chip interface reduces tool life and production efficiency.
Innovation Solution
A high pressure coolant tube with an annular flange and threaded collar, featuring an exit seal and entrance seal assembly comprising thermoplastic polyester elastomeric rings, which allows for reliable coolant flow up to 500 bar without backflow contamination, ensuring a fluid-tight seal between the tool body and clamping unit assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coolant pressure is increased to 500 bar to improve cooling effectiveness and chip evacuation, then coolant delivery performance is improved, but backflow contamination of the clamping unit assembly occurs
Solution Approach 1:
The coolant tube is segmented into distinct functional zones: an enlarged diameter section for high-pressure coolant delivery, a reduced diameter section for flow control, and sealed connection sections with seals at both ends. This segmentation allows the tube to maintain 500 bar pressure for effective cooling while preventing backflow into the clamping unit assembly through the reduced diameter section and seal arrangement.
Solution Approach 2:
The reduced diameter interior collar bore surface portion acts as an intermediary flow control element between the high-pressure coolant source and the tool body. This intermediate section with restricted diameter prevents backflow while allowing forward coolant flow, serving as a hydraulic mediator that protects the clamping unit assembly from contamination.
2Duration of action of stationary object
If coolant pressure is increased to 500 bar to reduce heat at the insert-chip interface, then tool life is improved, but seal reliability must be maintained under high pressure
Solution Approach 1:
The seal system parameters are specifically designed for high-pressure operation: the exit seal is positioned in an exit seal pocket with specific dimensions, and the entrance seal assembly includes an elastomeric ring with hardness of 51-61 Shore D. These parameter changes enable the seals to maintain reliability at 500 bar while delivering coolant to extend tool life through effective cooling.
3Object-affected harmful factors
If a threaded collar with seals is added to the coolant tube to prevent backflow, then backflow prevention is improved, but device complexity increases
Solution Approach 1:
The threaded collar is merged with the coolant tube body to form an integrated assembly. The collar incorporates the entrance seal assembly pocket and exit seal pocket directly into its structure, combining the fastening function and sealing function in a single integrated component rather than separate parts, thereby reducing overall device complexity while maintaining backflow prevention.
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 high pressure coolant tube effectively delivers coolant at 500 bar, preventing backflow contamination and enhancing tool life and production efficiency by maintaining a clean interface and facilitating chip evacuation, thus reducing re-cutting and heat-related issues.
Implementation Method 1
an entrance seal assembly comprising an entrance seal sandwiched by a pair of thermoplastic polyester elastomeric rings
Implementation Method 2
the exit seal is compressed between the tool body shoulder and the exit-facing flange surface of the annular flange
Data Source
Figure 1~2
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AI summary
A high pressure coolant tube (20) for receipt by a tool body that includes a coolant tube body (22) with an annular flange (28) adjacent to the exit body end. There is a threaded collar (48) that has an exterior threaded surface. The threaded collar contains an interior collar bore comprising an enlarged diameter interior collar bore surface portion and a reduced diameter interior collar bore surface portion. There is an exit seal pocket (34) defined by an exit-facing flange surface of the annular flange and a reduced diameter body section and the enlarged diameter interior collar bore surface portion. There is an entrance seal assembly pocket (64) defined by an entrance-facing flange surface of the annular flange and a reduced diameter body section and the enlarged diameter interior collar bore surface portion. An exit seal (70) is in the exit seal pocket. An entrance seal assembly (78) is in the entrance seal assembly pocket wherein the entrance seal assembly comprises an entrance seal (80) sandwiched by a pair of thermoplastic polyester elastomeric rings (82, 84).