Rotatable Tableting Punch Head for Low-Wear Force Transmission
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Solution Overview
Problem
Tabletting punches in rotary presses face high wear due to interactions between punch heads and cam tracks, particularly under high surface pressures, leading to sliding movements and torsional moments, which complicates the transmission of operating forces and affects positioning accuracy.
Innovation Solution
A tabletting stamp design where the punch head has a non-rotatably connected head body and a separately rotatable pressure-receiving element, allowing for a heavy-duty axial thrust bearing and minimizing sliding friction, with a holding magnet for fall-out safety and optional form-fitting safety devices to reduce wear and maintain positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the punch head is firmly connected to the shank to ensure force transmission, then the transmission of operating forces is reliable, but wear increases due to sliding movements under high surface pressure
Solution Approach 1:
The punch head is divided into two separate parts: a head body firmly connected to the shank and a pressure-receiving element that can rotate independently. This segmentation allows the head body to transmit forces reliably while the rotatable pressure-receiving element minimizes wear from sliding movements.
Solution Approach 2:
The pressure-receiving element is designed to rotate freely relative to the head body, transforming the static connection into a dynamic one. This rotation capability reduces sliding friction and wear under high surface pressure while maintaining effective force transmission.
2Object-affected harmful factors
If the punch head is made rotatable to reduce wear, then wear is reduced, but the transmission of tensile forces becomes problematic
Solution Approach 1:
By separating the punch head into a firmly connected head body and a rotatable pressure-receiving element, the design allows the head body to handle tensile forces from the cam track while the pressure-receiving element rotates to minimize wear during pressing.
Solution Approach 2:
The rotatable pressure-receiving element dynamically adapts to pressing forces by rotating, reducing wear, while the head body maintains a firm connection to the shank for reliable tensile force transmission during retraction movements.
3Object-affected harmful factors
If a rotatable pressure-receiving element is introduced to minimize sliding friction, then wear is reduced, but the device complexity increases
Solution Approach 1:
The punch head is segmented into a head body and a pressure-receiving element that can be independently replaced. This modular design reduces wear by allowing easy replacement of the worn pressure-receiving element without replacing the entire punch head, thus managing complexity through maintainability.
Solution Approach 2:
The pressure-receiving element is designed as a consumable component that can be easily replaced when worn, while the head body is retained and reused. This approach manages device complexity by focusing maintenance on replaceable parts rather than the entire assembly.
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 design effectively transmits high pressing and tensile forces with reduced wear, minimizing sliding friction and torsional moments, allowing for easier replacement of wear-prone parts and improved operational reliability.
Implementation Method 1
to form the fall-out safety device, a holding magnet is arranged between the head body and the pressure-receiving element
Implementation Method 2
A heavy-duty and structurally simple axial thrust sliding bearing can therefore be used here between the head body and the pressure receiving element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a tableting punch (1) comprising a shaft (2) and a punch head (3). The punch head (3) has a circumferential surface (6), a central mirror surface (8) on the side of the circumferential surface (6) facing away from the shaft (2), and a retraction surface (7) on the side of the circumferential surface (6) facing the shaft (2). Furthermore, the punch head (3) has a head base (4) and, separately, a central pressure-receiving element (5), wherein the head base (4) is rotationally fixed and, in particular, integrally connected to the shaft (2), and wherein the circumferential surface (6) and the retraction surface (7) are formed on the head base (4). The pressure-receiving element (5) is rotatably mounted in the head base (4). The central mirror surface (8) is formed on the pressure-receiving element (5).