Self-Lubricating Rolling Bars for High-Temperature Continuous Presses
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Solution Overview
Problem
Continuous presses using rolling bars in wood-based panel production and composite material manufacturing face challenges with conventional lubricants, which incur operating costs and have limited temperature resistance, necessitating frequent application and limiting operational efficiency.
Innovation Solution
Applying a self-lubricating coating, such as tungsten carbide or molybdenum disulfide, to the cylindrical surface and end faces of roller bars to provide inherent lubrication, reducing or eliminating the need for liquid lubricants and enhancing temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid lubricants are sprayed onto the roller bars, then friction is reduced and roller bars can operate, but operating material costs increase and temperature range is limited
Solution Approach 1:
The roller bar is equipped with a self-lubricating coating that provides inherent lubrication without requiring external lubricant application. The coating contains lubricant reservoirs or structures that automatically supply lubrication to the contact surfaces, enabling the roller bar to service itself and eliminate continuous lubricant consumption.
Solution Approach 2:
The invention changes the physical state and application method of lubrication from liquid spray coating to a self-lubricating solid coating system. This parameter change allows the roller bar to operate without liquid lubricants, expanding the temperature range and eliminating lubricant consumption while maintaining friction reduction.
2Reliability
If liquid lubricants are used on roller bars, then friction is reduced, but the temperature range for operation is limited
Solution Approach 1:
The self-lubricating coating provides inherent lubrication that is not dependent on liquid lubricants with limited temperature ranges. The coating material and structure are designed to maintain lubrication properties at elevated temperatures, allowing the roller bar to operate reliably in high-temperature environments without external lubricant application.
Solution Approach 2:
The invention changes the lubrication system from liquid-based to a solid self-lubricating coating system that can withstand higher temperatures. This parameter change in lubrication methodology removes the temperature constraints associated with liquid lubricants while maintaining friction reduction capabilities.
3Ease of manufacture
If conventional roller bars are used without self-lubricating coating, then manufacturing is simpler, but friction is higher and lubricant consumption increases
Solution Approach 1:
The invention modifies the surface properties of the roller bar by applying a self-lubricating coating, changing the friction characteristics from high (requiring liquid lubrication) to low (self-lubricating). This parameter change in surface treatment reduces friction and eliminates the need for continuous lubricant application.
Solution Approach 2:
The roller bar is enhanced with a self-lubricating coating that creates a composite structure combining the base roller bar material with lubricant-containing material. This composite approach provides both structural integrity and self-lubrication properties, reducing friction without requiring external lubricants.
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 self-lubricating coating reduces lubricant consumption, allows higher operating temperatures, and increases production efficiency by reducing heating time, leading to cost savings and improved output.
Implementation Method 1
at least the cylinder jacket is provided with a self-lubricating (and consequently friction-reducing) coating
Implementation Method 2
a plasma-enhanced physical gas deposition process (plasma PVD) is used (physical vapor deposition)
Implementation Method 3
an upper, heatable press platen (upper heating plate) in the upper part of the press and a lower, heatable press plate (lower heating plate)
Implementation Method 4
The material to be pressed is pressed in the pressing gap between the rotating steel belts using pressure and heat
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a rolling bar (1) as a rolling element unit for a continuous press (2) having endlessly revolving pressing belts (3); the rolling bar (1) is cylindrical, is made of steel, for example, and has a cylinder jacket (6a) and end faces (6b); the end faces (6b) are optionally provided with bearing bores (7) into which rolling bar bearing pins can be or are inserted. The rolling bar is characterized in that at least some areas at least of the cylinder jacket (6a) are provided with a self-lubricating coating (8).