Electric Cutting Blade Braking for Precise Stop Position
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Solution Overview
Problem
Electric cutting devices face challenges in stopping cutting blades at a predetermined position due to varying operation speeds based on the material and shape of the object being cut, leading to potential blade collision and deformation.
Innovation Solution
An electric cutting device equipped with a control unit that acquires a speed index to calculate a braking distance index, allowing for precise braking of the cutting blades to stop at an appropriate position, even if the braking distance varies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting blades are operated at high speed to shorten cutting time, then productivity is improved, but the cutting blades may collide with each other at high relative speed causing deformation or damage
Solution Approach 1:
The control unit performs preliminary action by calculating the braking distance index before the cutting blades complete their cutting stroke, based on the current operation speed. This allows the braking process to be initiated at the appropriate timing to ensure the blades stop at the target position without collision, while maintaining high operating speeds throughout the cutting stroke.
Solution Approach 2:
The control unit implements feedback control by continuously monitoring the operation speed of the cutting blades and using this information to calculate the braking distance index. The actual operation speed feedback allows the system to adjust the braking timing and duration dynamically, ensuring accurate stopping position regardless of speed variations during cutting.
2Reliability
If the operation speed is reduced to prevent blade collision, then reliability is improved, but the cutting operation takes too much time reducing productivity
Solution Approach 1:
The control unit calculates the braking distance index in advance based on the current operation speed, determining the optimal timing to initiate braking. This preliminary calculation allows the cutting blades to maintain high speed during the cutting stroke and then brake smoothly at the precise moment needed, preventing collision without sacrificing overall cutting speed.
Solution Approach 2:
The cutting blades operate in periodic cycles: high-speed cutting stroke followed by controlled braking phase. This periodic action pattern allows the system to maximize cutting speed during the productive cutting phase while dedicating a separate braking phase to ensure safe stopping, thus maintaining both productivity and reliability.
3Manufacturing precision
If the braking distance is extended to ensure accurate stopping, then manufacturing precision is improved, but the operation time increases reducing productivity
Solution Approach 1:
The control unit performs preliminary calculation of the braking distance index based on the current operation speed before braking begins. This allows the system to determine the exact braking timing needed to stop at the target position, achieving precise stopping without requiring extended braking distance that would increase cycle time.
Solution Approach 2:
The control unit dynamically changes the braking parameters (braking distance index) based on the actual operation speed. When the cutting blades operate at higher speeds, the braking distance index is adjusted accordingly to ensure they stop at the correct position. This parameter adaptation allows precise stopping while minimizing the time added to the cutting cycle.
Data Source
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AI summary
An electric cutting device includes a pair of cutting blades configured to clamp and cut an object, an electric motor configured to generate a driving force necessary for operating the cutting blades, a control unit configured to control an operation of the electric motor, and a speed acquisition unit configured to acquire a speed index, the speed index indicating an operation speed of the cutting blades. The control unit is configured to brake the cutting blades based on the speed index.