Powder Dry-Pressing Molding Device with Scraping Mechanism
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Solution Overview
Problem
Traditional dry-pressing molding equipment for alumina ceramic has complex structures, inconvenient operation, and issues with uneven pressure distribution, leading to poor blank density uniformity and potential defects like cracking and deformation.
Innovation Solution
A compact powder dry-pressing molding device with a scraping mechanism, utilizing a cam and crankshaft mechanisms for simultaneous or non-simultaneous pressurization in two directions, and a resetting cylinder for vacuuming the compacting space to ensure uniform powder distribution and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional dry-pressing molding equipment is used, then molding capability is achieved, but the structure becomes complex and operation becomes inconvenient
Solution Approach 1:
The patent combines the feeding mechanism, scraping mechanism, and pressing mechanisms into an integrated device. The pusher with feeding channel, cam-driven scraping mechanism, and dual punch pressing system are merged into a single coordinated unit, reducing overall structural complexity while maintaining full functionality
Solution Approach 2:
The workbench mechanism serves multiple functions: it supports the middle mold, accommodates the mandrel, provides a surface for the scraping mechanism to operate, and facilitates powder filling and removal. This multi-functionality reduces the need for separate dedicated components
2Manufacturing precision
If uniaxial or bidirectional molding is used with hydraulic press, then molding is achieved, but pressure distribution becomes uneven leading to poor blank density uniformity
Solution Approach 1:
The pressing action is segmented into two independent but coordinated directions through the upper and lower punches. Each punch can apply pressure independently, allowing for better control of pressure distribution throughout the powder bed, resulting in more uniform blank density
Solution Approach 2:
The scraping mechanism performs preliminary action by scraping the powder surface before pressing. This ensures uniform powder distribution and eliminates surface irregularities that would cause uneven pressure distribution during subsequent pressing operations
3Productivity
If mechanical press is used, then molding speed is improved, but pressure changes with powder filling amount causing size shrinkage difference
Solution Approach 1:
The scraping mechanism provides feedback control by continuously adjusting the powder surface level. This ensures consistent powder filling amount and distribution, which stabilizes the pressure application during pressing and reduces size shrinkage variation
Solution Approach 2:
The patent replaces the traditional mechanical press system with a cam-driven mechanism. The cam converts rotational motion into controlled linear motion of the punches, providing more precise and stable pressure control that is less sensitive to powder filling variations
4Adaptability or versatility
If powder filling amount varies, then molding flexibility is improved, but height of pressed part becomes different affecting quality
Solution Approach 1:
The scraping mechanism performs preliminary action by scraping the powder surface to a uniform level before pressing. This preliminary scraping ensures consistent powder height and density regardless of initial filling variations, leading to consistent pressed part height and quality
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 device achieves uniform blank density, reduces defects, and enhances molding quality with improved automation and ease of operation, while being adaptable to various powders with high abrasiveness.
Implementation Method 1
the resetting cylinder is configured to move the lower punch downward to vacuumize the compacting space, so as to suck the powder into the compacting space
Data Source
AI summary
The present invention relates to a powder dry-pressing molding device and method. The powder dry-pressing molding device includes a rack, the rack is provided with an first pressure mechanism, a workbench mechanism and a second pressure mechanism in sequence along an up-and-down direction, and one side of the workbench mechanism is provided with a scraping mechanism; the first pressure mechanism includes an upper slide block capable of moving up and down, and an upper punch is disposed at a bottom of the upper slide block; the workbench mechanism includes a middle mold seat, a workbench is fixed above the middle mold seat, a middle mold is disposed inside the middle mold seat, and a mandrel runs through the inside of the middle mold; the second pressure mechanism includes a lower slide block capable of moving up and down, a lower punch is fixed at the top end of the lower slide block, and the lower punch is capable of extending into a compacting space between the mandrel and the middle mold; and the scraping mechanism includes a pusher connected with a scraping driving mechanism and capable of moving along the workbench, the pusher is provided with a feeding channel capable of being communicated with the compacting space, and the feeding channel is capable of being communicated with a barrel disposed on the rack. The dry-pressing molding device of the present invention has a high degree of automation, can scrape the powder, and has a good processing effect.