Double-Structured Punch for Rotary Compression Molding
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Solution Overview
Problem
The manufacturing of moldings with cores using rotary compression molding machines faces challenges such as difficulty in sampling specimens for quality assurance, low sidewall strength due to insufficient powder density, and complex mechanisms required for accurate core placement, leading to reduced production efficiency and increased machine complexity.
Innovation Solution
A double-structured punch with variable engagement and relative position restriction means allows for flexible movement and independent operation of center and outer punches, enabling precise control of punch positions and reducing the complexity of the compression mechanism, allowing for high-speed operation and improved packing density of molding materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate tablet machine is used to prepare cores before feeding them into a dry coated tablet machine, then core tablets can be formed, but production efficiency decreases and machine complexity increases due to the need for complicated feeding and monitoring mechanisms
Solution Approach 1:
The patent combines the core formation and outer layer coating operations into a single compression molding machine. The double-structured punch integrates both center punch (for core) and outer punch (for outer layer) functions, allowing simultaneous formation of core tablets and coated tablets in one machine, thereby eliminating the need for separate tablet machines and complex feeding mechanisms while maintaining core placement accuracy
Solution Approach 2:
The compression molding machine is designed with multi-functional capability to perform both core tablet formation and outer layer coating operations. The double-structured punch system allows the same machine to create different tablet types (core tablets and coated tablets) using the same equipment, reducing the number of machines required and simplifying the overall production system
2Productivity
If a double-structured punch with independent center and outer punches is used, then molding material can be compressed efficiently, but the compression mechanism becomes complicated
Solution Approach 1:
The patent merges the compression functions for core and outer layers into a unified compression mechanism. The double-structured punch allows both center and outer punches to be compressed simultaneously by the same compression force, eliminating the need for separate compression mechanisms while maintaining high compression speed and efficiency
Solution Approach 2:
The punch structure is designed with nested configuration where the center punch is positioned within the outer punch. This nesting allows the compression mechanism to act on both punches simultaneously through a single compression point, simplifying the overall compression mechanism while enabling efficient compression of both core and outer layer materials
3Manufacturing precision
If the punch tip of the lower punch has a rounded surface, then molding material can be compressed, but sampling of provisional moldings becomes difficult when the provisionally molded outer layer is thin
Solution Approach 1:
The patent employs a movable center punch that can be extended or retracted relative to the outer punch. During compression, the center punch is extended to protrude from the outer punch tip, creating sufficient height for sampling. This dynamic adjustment allows the system to maintain both molding precision and sampling accessibility without compromising either function
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 solution enables high-speed operation of the rotary compression molding machine, allows for accurate sampling of provisional moldings, and enhances the strength of the molding by increasing the packing density of the outer layer, thereby improving the quality and efficiency of the molding process.
Implementation Method 1
first pre-compression rolls (7A and 8A) for compressing the first molding material (PD1)
Data Source
AI summary
This invention provides a punch comprising: a center punch and an outer punch surrounding the outer periphery of the center punch, both of which being slidable and capable of compressing; and relative position restriction means for restricting a relative position of the center and outer punches, the relative position restriction means being configured to restrict a first position in which a punch tip of the center punch is protruded from a punch tip of the outer punch and a second position in which the punch tip of the center punch is substantially coincident with the punch tip of the outer punch, and being configured to fail to restrict a third position in which the punch tip of the center punch is retracted in the punch tip of the outer punch, as well as a rotary compression molding machine provided with the double-structured punch.