Liquid Discharge Control for Consistent Line Width at Variable Speed
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Solution Overview
Problem
Existing liquid material application techniques require laborious programming to maintain consistent discharge rates and line widths, especially when relative moving speeds between the dispenser and worktable change, making it difficult to perform applications with varying line widths and preventing spot applications.
Innovation Solution
A liquid material application apparatus with a discharge control unit that switches between modes to adjust discharge amounts based on relative moving speed or maintain a constant discharge rate regardless of speed, allowing for line drawing, dumping, trial, and spot applications with reduced programming effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the discharge amount is controlled in accordance with pattern data stored in a microcomputer to maintain consistent line width, then manufacturing precision is improved, but device complexity increases due to required programming
Solution Approach 1:
The discharge control unit automatically adjusts the discharge amount based on detected relative moving speed without requiring external programming. The system serves itself by using its own speed detection capability to control discharge, eliminating the need for complex pattern data programming while maintaining consistent line width.
Solution Approach 2:
The discharge control unit receives feedback about the relative moving speed between the dispenser and worktable and automatically adjusts the discharge amount in response. This closed-loop feedback mechanism eliminates the need for pre-programming discharge patterns while maintaining manufacturing precision.
2Adaptability or versatility
If the relative moving speed is changed in corner portions to adapt to application pattern, then adaptability is improved, but manufacturing precision deteriorates due to line width variation
Solution Approach 1:
The discharge amount parameter is dynamically changed in response to changes in relative moving speed. When the speed changes in corner portions, the discharge control unit automatically adjusts the discharge amount to compensate, maintaining consistent line width while allowing speed adaptation to different application patterns.
3Ease of operation
If the discharge amount is automatically controlled in accordance with relative moving speed change, then ease of operation is improved, but discharge precision deteriorates in terms of controlling discharge amount at each position
Solution Approach 1:
The discharge control unit changes the discharge amount parameter based on the detected relative moving speed while maintaining precise control. The system achieves both ease of operation through automatic speed-based control and discharge precision by directly linking discharge amount to speed measurements.
4Manufacturing precision
If the discharge pressure is reduced at start point of corner portion to apply proper liquid amount, then manufacturing precision is improved, but device complexity increases due to divided locus programming
Solution Approach 1:
The discharge control unit automatically manages discharge pressure adjustments at corner portions without requiring divided locus programming. The system detects speed changes and self-adjusts discharge pressure, eliminating the need for complex programming while maintaining liquid amount precision.
Data Source
AI summary
Object: A liquid material application apparatus and a liquid material application method are provided with which a liquid material can be discharged in a predetermined discharge amount per unit time regardless of a relative moving speed in a series of application works.Solution: The liquid material application apparatus includes a discharge head, a robot moving the discharge head relative to a workpiece, a movement control unit controlling relative movement of the discharge head and the workpiece, and a discharge control unit controlling an operation of discharging a liquid material from a discharge head, wherein the discharge control unit executes, in a switchable manner in accordance with an application program, first mode discharge control of changing a discharge amount of the liquid material, which is discharged from the discharge head per unit time, depending on a relative moving speed between the discharge head and the workpiece, and second mode discharge control of operating the discharge head to discharge the liquid material in a predetermined discharge amount per unit time regardless of the relative moving speed. The liquid material application method is implemented using the liquid material application apparatus.