Tableting Device Segmented Die Inserts for Higher Punch Capacity
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Solution Overview
Problem
Existing rotary tablet press technologies face challenges in increasing production capacity while maintaining mechanical stability and compatibility with standard die insert fixing solutions, due to issues such as die insert deformation and handling difficulties.
Innovation Solution
A tableting device with a rotary turret featuring a die table with receiving recesses for die inserts, where each die insert has a pair of working bores and a circular cylindrical outer surface, allowing for increased working bores without requiring non-standard tooling or complex fixation solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of punches is increased by decreasing tooling dimensions below industry standards, then production capacity is improved, but die insert deformation and fixing difficulties occur
Solution Approach 1:
The die insert is divided into a body portion and a flange portion. The flange portion with external cylindrical surface provides a standardized mounting interface for secure fixation, while the body portion contains the working bores. This segmentation allows the die insert to maintain structural integrity and proper fixation even when working bores are reduced in size to accommodate more punches.
Solution Approach 2:
The die insert design with standardized external cylindrical surface on the flange portion makes it compatible with conventional fixing solutions and existing die tables. This universal interface allows the same fixing mechanism to be used regardless of the number or size of working bores, enabling increased productivity while maintaining reliability through proven fixation methods.
2Reliability
If exchangeable die plates with die bores directly provided into the plate are introduced to prevent deformation, then die insert stability is improved, but heavy tables cannot be easily handled and applicability is limited to small pitch circle diameter
Solution Approach 1:
The die insert is segmented into a body portion containing working bores and a separate flange portion providing the mounting interface. This allows the functional elements (working bores) to be optimized for stability while the flange portion maintains standardized dimensions for easy handling and compatibility with various die table sizes, overcoming the limitation of heavy tables.
Solution Approach 2:
Instead of providing die bores directly into the die plate (which creates handling difficulties), the invention provides die inserts with working bores that are then mounted into the die plate. This inversion separates the working function from the mounting function, allowing easy handling of standardized die inserts while maintaining stability during operation.
3Productivity
If segmented exchangeable die plates are developed to increase punches on pitch circle, then production capacity is improved, but strict tolerances are required to ensure die bores match punch tips and guarantee correct body diameter
Solution Approach 1:
The die insert with standardized external cylindrical surface on the flange portion can be mounted using conventional fixing solutions with standard tolerances. This universal interface eliminates the need for strict tolerances between die bores and punch tips, as the standardized mounting ensures proper alignment and positioning regardless of the number of working bores on the pitch circle.
Solution Approach 2:
By separating the die insert into body and flange portions with the flange providing a standardized mounting interface, the invention decouples the precision requirements. The flange portion with conventional tolerances ensures proper positioning, while the body portion can accommodate multiple working bores without requiring strict tolerance control between bores and punches.
4Productivity
If tooling with multiple tips on the same punch is used to increase output capacity, then production capacity is improved, but complexity increases and weight evaluation during compression cannot be performed
Solution Approach 1:
Instead of adding multiple tips to a single punch (which increases complexity), the invention segments the solution by providing multiple separate working bores within a single die insert. Each working bore accommodates a standard single-tip punch, maintaining simplicity in the punch design while achieving increased output capacity through the multi-bore die insert configuration.
Data Source
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AI summary
Tableting device (2) comprising a rotary turret with a rotation axis including: an upper receptacle body (10) provided with reciprocating upper punches (12), a lower receptacle body (20) provided with reciprocating lower punches (22), a die table (30), die inserts (40); wherein the die table (30) is provided with receiving recesses (32), in which the die inserts (40) are arranged; wherein the die inserts (40) and the receiving recesses (32) have a complementary form; wherein each die insert (40) comprises at least one circular cylindrical outer surface (44, 46) with a die insert outer diameter (N), said surface (44, 46) facing an inner surface (34, 36) of the corresponding receiving recess (32),wherein each die insert (40) comprises a pair of working bores (42), in which a pair of directly adjacent upper punches (12) respectively reciprocate in use, and in which a corresponding pair of directly adjacent lower punches (22) respectively reciprocate in use.