Single-Punch Press Brake System for Multilayer Tablet Cohesion
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Solution Overview
Problem
Current single-punch presses in R&D for simulating industrial tablet production face issues with high inertia, low speed, and reliability problems such as bursting or lack of cohesion in solid products, and struggle to produce multilayer tablets without intermediate layers returning to a powdery state or metering errors.
Innovation Solution
A single-punch simulation press with a lower punch having a brake system to maintain contact and control stroke, and an upper punch that only performs a counter-reaction, using ball or roller screws actuated by electric motors for precise control, allowing for high-pressure compression and flexible movement to simulate rotary press operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-punch presses use connecting rod-crank members to actuate punches, then the punches can be motorized with variable translation height, but the system exhibits high inertia and low speed
Solution Approach 1:
The patent extracts the heavy connecting rod-crank mechanism from the system and replaces it with a direct-drive motorized lower punch and a simple cam-actuated upper punch. This removes the high-inertia transmission components while retaining the ability to control punch translation height through direct motor control and cam profile selection.
Solution Approach 2:
The patent replaces the mechanical connecting rod-crank transmission system with an electric motor directly driving the lower punch, combined with a cam mechanism for the upper punch. This substitution reduces mechanical inertia and increases actuation speed while maintaining variable translation capability through electronic control and cam profile design.
2Adaptability or versatility
If traditional single-punch presses use connecting rod-crank members for punch actuation, then variable compression ratio is achieved, but reliability problems occur with product cohesion
Solution Approach 1:
The patent removes the connecting rod-crank mechanism that causes reliability issues and replaces it with a direct motorized lower punch system. This eliminates the problematic mechanical transmission while maintaining compression ratio control through direct motor control and cam profile selection, resulting in improved product cohesion.
Solution Approach 2:
The patent incorporates feedback control through the cam mechanism design, where the cam profile is specifically shaped to provide optimal force distribution during compression. This ensures reliable product cohesion by maintaining consistent contact force between punches and powder throughout the compression cycle, preventing bursting and delamination.
3Productivity
If rotary presses are used for tablet production, then production speed is high, but the minimum volume of powder required and mechanical constraints increase
Solution Approach 1:
The patent segments the compression process into distinct phases controlled by the cam mechanism: filling phase, compression phase, and ejection phase. This segmentation allows the press to operate efficiently with minimal powder volume by precisely controlling when each phase occurs, unlike rotary presses that require continuous operation with larger powder inventories.
Solution Approach 2:
The patent employs dynamic control of the lower punch position through motorized actuation, allowing the system to adapt to varying powder volumes and compression requirements in real-time. This dynamic capability enables high productivity with minimal powder volume by optimizing each compression cycle according to actual material conditions.
4Speed
If deformable cam profiles are used to improve lower punch action, then compression speed increases to match industrial presses, but device complexity and production cost increase
Solution Approach 1:
The patent applies local quality by using a deformable cam profile specifically at the critical compression zone where force application is most needed. The cam profile is customized in this local area to optimize compression speed and force distribution, while the rest of the mechanism remains simple and easy to manufacture.
Solution Approach 2:
The patent changes the geometric parameters of the cam profile to achieve high compression speed. By carefully designing the cam curvature and lift characteristics, the system achieves industrial-speed compression without requiring complex mechanical transmissions, thereby maintaining simplicity in the overall device structure.
5Productivity
If conventional presses compress multilayer tablets, then production is achieved, but intermediate layers return to powdery state or metering errors occur
Solution Approach 1:
The patent applies preliminary action by using the cam mechanism to pre-compress each layer immediately after powder deposition, before subsequent layers are added. This preliminary compression stabilizes each intermediate layer, preventing it from returning to a powdery state and ensuring accurate metering for the next layer.
Solution Approach 2:
The patent maintains continuity of useful action through the cam-actuated lower punch that continuously applies compression force throughout the multilayer building process. This continuous compression action prevents layer delamination and maintains cohesion, ensuring reliable production of intact multilayer tablets.
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 solution provides reliable production of solid and multilayer tablets with improved cohesion and metering, achieving high-pressure compression and efficient cycle times, while being simpler and less expensive to produce than existing systems.
Implementation Method 1
a brake, capable of limiting the stroke of said punch in the direction of the bottom in order to maintain contact
Implementation Method 2
actuating in a translation movement the lower punch, respectively the upper punch, by means of ball or roller screws
Implementation Method 3
ensure the compression of the pulverulent material(s) and the production of the solid product
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a facility for producing a solid product using one or more powder materials, including: a means for supplying powder material(s); a die for receiving said powder material(s), and for shaping a solid product to be produced, secured in an advantageously reversible manner to a die-holding table secured to the frame of the facility; an upper punch (8) and a lower punch, translatable, suitable for engaging with one another at said die in order to perform the compression of the powder material(s) and the production of the solid product. The lower punch (7) is connected to a system for uncoupling the means or members that provide the movement thereof, said system in turn being provided with a brake (39), suitable for limiting the travel of said lower punch (7) in the downward direction in order to keep said punch in contact with the powder material contained in the die when producing the solid product, in particular having multiple layers, and in consequence, in order not to generate additional compression during the movement of the various mixtures of powder product into the die during the intermediate filling phases for each layer of product.