Allowable Value Setting for Component Mounting Deviation
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Solution Overview
Problem
Existing component mounters lack clarity on which allowable value to prioritize between component-type and coordinate-specific allowable values for deviation amounts during component pickup, leading to inefficient mounting processes.
Innovation Solution
An allowable value setting device and method that differentiate between two types of allowable values, with a first value set for each component type and a second, smaller value set for specific mounting coordinates, where the second value takes priority during the suction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single allowable value is set for each component type, then the setting process is simple, but it cannot account for variations in mounting coordinates and interference risks
Solution Approach 1:
The patent segments the allowable value setting into two distinct levels: component-type level (first allowable value) and coordinate level (second allowable value). This segmentation allows the system to maintain simplicity at the component type level while adding precision at the specific mounting coordinate level, resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The patent applies local quality by setting different allowable values for different mounting coordinates based on local interference conditions. The second allowable value is specifically adjusted for coordinates with high interference risk, while other coordinates can use more lenient values, thus improving precision without uniformly increasing complexity.
2Manufacturing precision
If a smaller allowable value is set for specific mounting coordinates to reduce interference, then placement accuracy is improved, but the suction process becomes more restrictive
Solution Approach 1:
The patent introduces dynamic selection of allowable values based on the suction process status. The control unit dynamically determines whether to apply the first allowable value (more flexible) or the second allowable value (more restrictive) depending on the specific mounting coordinate and interference conditions, thus balancing precision requirements with operational flexibility.
Solution Approach 2:
The patent changes the allowable value parameter conditionally: using the first allowable value for general cases and the second allowable value for specific high-risk coordinates during the suction process. This parameter change approach allows the system to maintain ease of operation for most cases while ensuring precision where needed.
3Reliability
If the second allowable value is preferentially adopted during suction process, then interference risk is reduced, but the control complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing the second allowable values for all mounting coordinates before the actual mounting process. The control unit simply retrieves and applies the appropriate value based on the current coordinate, avoiding real-time complex calculations and reducing control complexity while maintaining reliability.
Solution Approach 2:
The patent creates a copied structure of allowable values where the second allowable value is derived from but distinct from the first allowable value. This copying approach allows the system to maintain the original component-type-based settings while adding coordinate-specific adjustments, increasing reliability without proportionally increasing control complexity.
Data Source
AI summary
An allowable value setting device sets an allowable value of a deviation amount between a target pickup position and an actual pickup position in a component when the component is picked up by a suction nozzle. The allowable value setting device includes a first setting section and a second setting section. The first setting section sets a first allowable value, which is the allowable value for each component type of the component to be mounted on a board. The second setting section sets a second allowable value, which is the allowable value that is set for each mounting coordinate of the component and smaller than the first allowable value of the component of the same component type set by the first setting section, the second allowable value being preferentially adopted over the first allowable value in a suction process of the component.