Divided Die Gas Injection for Powder Removal
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Solution Overview
Problem
Conventional die apparatuses for powder compaction face issues where powder adheres to cut surfaces, hindering the formation of a desired cavity shape due to powder intrusion and abrasion, leading to poor contact between die surfaces.
Innovation Solution
The die apparatus incorporates gas passages and injection ports on the cut surfaces of divided dies to generate air flows that remove powder from the gaps between the dies, ensuring clean contact and precise shape formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dies are moved backward after forming the powder compact, then the powder compact is released from the dies, but powder drops from the powder supply apparatus or intrudes into the gap between the cut surfaces, causing powder to adhere to the cut surfaces
Solution Approach 1:
Gas is injected through the gas passage before the dies come into contact with each other to preliminarily clean the cut surfaces of adhering powder. This preliminary cleaning action prevents powder intrusion when the dies close, ensuring the cut surfaces can form the cavity with desired precision without contamination from previously adhered powder.
Solution Approach 2:
A gas passage is provided in the die to inject gas through a gas injection port disposed in each cut surface. The gas flow generated by this pneumatic system blows off powder adhering to the cut surfaces, solving the problem of powder contamination that occurs during the backward movement and release of the powder compact.
2Productivity
If powder adheres to the cut surfaces, then the dies can be moved backward to release the powder compact, but the adhering powder hinders tight contact between the cut surfaces when forming the next powder compact
Solution Approach 1:
Gas injection through the gas passage is performed as a preliminary cleaning step before the dies close to form the next powder compact. This ensures that even if powder adhered during the previous cycle, it is removed before the next forming operation, maintaining both productivity and cavity shape precision.
Solution Approach 2:
The gas passage system uses pneumatic flow to blow off adhering powder from the cut surfaces. This allows continuous production to proceed without interruption while maintaining the precision required for each new powder compact, as the gas cleaning occurs rapidly during the die closing process.
3Duration of action of stationary object
If the cut surfaces have abrasion, then the dies can be reused multiple times, but the abrasion creates gaps that allow powder to intrude and adhere to the cut surfaces
Solution Approach 1:
The gas passage system compensates for wear-induced gaps by generating high-velocity gas flow that actively removes powder from the gap region. This allows the dies to maintain manufacturing precision throughout their service life, even as abrasion creates larger gaps between cut surfaces during repeated use.
Solution Approach 2:
The gas injection system provides self-cleaning functionality to the die apparatus. The gas flow automatically removes adhering powder from the cut surfaces without requiring external manual cleaning operations, maintaining precision continuously throughout the die's operational life despite accumulated wear.
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 air flow effectively removes powder from the cut surfaces, allowing for secure and accurate formation of the cavity shape, even with die abrasion, by increasing the flow rate as the gap narrows, thus preventing powder intrusion and ensuring consistent die alignment.
Implementation Method 1
the gas is injected from the gas injection port through the gas passage formed in at least one of the divided dies of the pair of divided dies, thereby generating an air flow in a gap between the pair of divided dies
Implementation Method 2
The flow rate of the air flow increases as the gap between the pair of divided dies becomes narrow, and thus the powder adhering to the cut surfaces of the pair of divided dies that oppose each other can be blown off and removed
Data Source
AI summary
A die apparatus capable of removing powder adhering to cut surfaces so as to securely form a cavity in a desired shape includes divided dies reciprocatingly driven by sliders to comes into contact with one another so as to form a cavity. Punches are inserted into the cavity from above and below the cavity. Each divided die is provided with cut surfaces that come into contact with the other divided dies. A gas passage connected to a gas injection port that injects gas from the cut surface is formed in each divided die.