Servo Press Eccentric Joint Lubrication Under Short Cycle Motion
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Solution Overview
Problem
Servo press machines face challenges in reliably supplying lubricant between the eccentric shaft and connecting rod sliding surfaces due to the short non-press load period and close contact during pendular operation, leading to lubrication failure and potential seizure.
Innovation Solution
A servo press machine design with an oil supply port and supply mechanism that pressurizes lubricant during the press load period and delivers it between the eccentric shaft and connecting rod sliding surfaces during the non-press load period, using a distributor and pump system to ensure consistent lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the connecting rod performs pendular operation with the crankshaft to reduce cycle time, then the productivity is improved, but the gap between the crankshaft and connecting rod sliding surfaces is hardly created, causing insufficient lubricant supply
Solution Approach 1:
The lubricant supply groove is filled with lubricant in advance before the pendular operation begins. The lubricant is stored in the groove during the period when the sliding surfaces are separated, ensuring that lubricant is already positioned and ready to be supplied when the sliding surfaces come into contact during the press load period
Solution Approach 2:
The lubricant acts as an intermediary substance that is stored in the supply groove and mediates the lubrication between the crankshaft and connecting rod sliding surfaces. The groove itself serves as an intermediary reservoir that holds the lubricant and facilitates its transfer to the sliding surfaces during operation
2Productivity
If the slide motion is concentrated in the press load period to reduce cycle time, then the productivity is improved, but the lubricant cannot be sufficiently supplied from the groove to the sliding surfaces
Solution Approach 1:
The lubricant is preliminarily filled into the supply groove during the non-press load period when the sliding surfaces are separated. This preliminary action ensures that the groove contains sufficient lubricant before the press load period begins, allowing lubricant to be supplied to the sliding surfaces even when the motion is concentrated
Solution Approach 2:
The lubricant supply operates periodically by filling the groove with lubricant during the non-press load period and then supplying it during the press load period. This periodic action synchronizes with the pendular operation of the crankshaft, ensuring lubricant is available at the appropriate times
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 solution ensures reliable lubrication between the sliding surfaces even during short non-press load periods, preventing lubrication failure and seizure, and maintaining mechanical integrity by pressurizing lubricant to overcome close contact forces.
Implementation Method 1
a supply mechanism that supplies the lubricant to the oil supply port, delivers the lubricant to the oil supply port and pressurizes the lubricant during a press load period in which the oil supply port is closed
Implementation Method 2
supplies the pressurized lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface from the oil supply port during a non-press load period
Data Source
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AI summary
A servo press machine (10) includes an eccentric shaft (13), a connecting rod (14), a slide (11), an eccentric shaft-side sliding surface (22), a connecting rod-side sliding surface (40), an oil supply port (24), and a supply mechanism (30). The oil supply port opens on the eccentric shaft-side sliding surface or the connecting rod-side sliding surface, and supplies a lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface. The supply mechanism supplies the lubricant to the oil supply port. The eccentric shaft-side sliding surface is formed on the eccentric shaft that is rotationally driven by a servomotor (18). The oil supply port is formed on the connecting rod-side sliding surface of the connecting rod that moves upward and downward due to the rotational driving of the eccentric shaft.