Punch Tip Air Assist Timing for Smooth Can Extraction
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Solution Overview
Problem
During the manufacturing of metal cans using a press machine, the punch often fails to be pulled out smoothly due to negative pressure generated between the can bottom and the punch tip, leading to issues such as can crushing or the can being blown off and colliding with surrounding structures.
Innovation Solution
A method and device for manufacturing cans that involve adjusting the air pressure and blowing timing of air assist to facilitate the smooth extraction of the punch. This is achieved by incorporating an air blowing port at the punch tip and a controller that adjusts air pressure and timing based on the specific conditions of each shot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air assist is performed with fixed air pressure and blowing timing, then the punch can be pulled out from the can, but the negative pressure cannot be properly resolved leading to can crushing or collision with surrounding structures
Solution Approach 1:
The patent applies dynamics by making the air pressure and blowing timing variable rather than fixed. The air pressure is dynamically adjusted based on punch extraction speed, and the blowing timing is dynamically adjusted based on punch position and extraction speed, allowing the system to adapt to varying operational conditions and properly resolve negative pressure.
Solution Approach 2:
The patent changes physical parameters of the air assist system - specifically air pressure and blowing timing - to optimize punch extraction. By adjusting these parameters based on actual extraction conditions, the system can effectively resolve negative pressure without causing can damage or collision.
2Reliability
If air blow is strong to resolve negative pressure, then the punch can be pulled out, but the can is blown off and collides with surrounding structures
Solution Approach 1:
The patent controls air pressure within a specific range (0.01 to 0.5 MPa) and adjusts blowing timing based on punch position and extraction speed. This parameter control ensures sufficient air blow to resolve negative pressure while preventing excessive air blow that would cause can collision damage.
Solution Approach 2:
The system uses feedback from punch position detection and extraction speed measurement to adjust air blowing parameters in real-time. This feedback mechanism prevents excessive air blow by reducing air pressure or timing when the punch is close to extraction completion, thereby preventing can collision damage.
3Object-affected harmful factors
If air blow is weak to avoid can damage, then the can is protected, but the negative pressure cannot be resolved and the can is crushed
Solution Approach 1:
The patent sets air pressure within a minimum threshold (0.01 to 0.5 MPa) to ensure sufficient air blow for resolving negative pressure while preventing can damage. The blowing timing is also optimized to apply air assist at the appropriate moment, ensuring both can protection and shape integrity.
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 proposed solution ensures that the punch can be smoothly pulled out from the processed can by appropriately adjusting air pressure and blowing timing, thereby preventing issues like can crushing or collision with surrounding structures.
Implementation Method 1
air is blown out from an air blowing port at a tip end of the punch to perform air assist of assisting extraction of the punch
Implementation Method 2
a negative pressure is generated in the space between the can bottom portion and the punch tip portion
Data Source
AI summary
To provide a can manufacturing method performing air assist capable of smoothly pulling out a punch from a processed can by appropriately performing air assist. Provided is a can manufacturing method including drawing and/or drawing-and-ironing using a press machine, the method including stripping that includes removing a punch from a can after the drawing and/or the drawing-and-ironing. In the stripping, air is blown out from an air blowing port at a tip end of the punch to perform air assist of assisting extraction of the punch. In the air assist, a pressure of the air and/or a blowing timing of the air is adjusted for each shot to a pressure and/or a blowing timing according to a condition of the shot.