Stepwise Floating Load Reduction in Powder Compacting Apparatus
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Solution Overview
Problem
The abrupt reduction in floating load during the powder compacting process can cause damage to the floating lower punch-system components in existing powder compacting apparatuses.
Innovation Solution
A method for controlling the powder compacting apparatus that involves reducing the floating load in a stepwise manner after completion of pressurization, using servo actuators to control the descending motion of the upper and floating lower punches, and maintaining a certain load until it is gradually reduced to zero, preventing abrupt movements that could damage the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the floating load is abruptly reduced after pressurization, then the green compact can be removed from the die, but the floating lower punch-system components may be damaged due to elastic recovery
Solution Approach 1:
The floating load is reduced in a stepwise manner rather than abruptly, creating periodic load reduction stages. This allows the elastic recovery to occur gradually in controlled steps, preventing sudden component damage while still enabling green compact removal
Solution Approach 2:
The patent applies beforehand cushioning by maintaining a residual floating load after pressurization instead of immediately reducing it to zero. This residual load acts as a cushion that prevents abrupt elastic recovery and potential component damage during the transition to green compact removal
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
This method effectively prevents damage to the floating lower punch-system components by avoiding abrupt load reductions, ensuring the apparatus operates safely and efficiently by maintaining control over the load reduction process.
Implementation Method 1
Immediately before the start of reduction in the floating load, the floating lower punch-system components (e.g. the floating lower punch, the actuator that drives the floating lower punch, and a connecting member that connects the floating lower punch to the actuator), which have been floated, are in a state where they are elastically deformed in a compressing direction, as a whole.
Data Source
AI summary
There is provided a method for controlling a powder compacting apparatus including: a die having a hollow; an upper punch and a floating lower punch; a first actuator that pushes down the upper punch; a second actuator that controls a floating load of the floating lower punch; and a stopper that defines a pressurization stop position of the floating lower punch. The powder compacting apparatus is configured such that the first actuator is operated to push down the upper punch to pressurize powder charged into the cavity, and the second actuator is controlled to pressurize the powder such that a load acting on the powder during pressurization becomes a prescribed floating load required to compact the powder. The method includes reducing the floating load in a stepwise manner after completion of the pressurization.