Ceramic Powder Press Actuator Control for Dimensional Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ceramic or metal powder presses face challenges in achieving precise pressing parameters due to fluctuations in powder quantity and composition, leading to errors in part height of pressed compacts, despite precise positioning and control methods.
Innovation Solution
A method that adjusts pressing parameters by measuring the distance between fixed stops supporting punch carriers and using these measurements to regulate the actuator control signals, ensuring compliance with setpoint values and compensating for deviations, thereby minimizing the influence of compression and thermal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional regulation of pressing forces and individual pressing positions is used with predetermined target values, then the positioning of punch carriers is simplified, but errors in part height of pressed compacts occur due to fluctuations in powder quantity and composition
Solution Approach 1:
The patent implements feedback control by measuring the actual distance between fixed stops supporting punch carriers and comparing it with the target distance. The control device automatically adjusts pressing parameters based on the deviation between measured and target values, closing the control loop to compensate for material fluctuations and maintain dimensional accuracy.
Solution Approach 2:
The patent dynamically adjusts pressing parameters (such as pressing force or position) based on measured deviations from target values. By changing these parameters in response to actual conditions rather than using fixed predetermined values, the system compensates for variations in powder quantity and composition to maintain consistent compact dimensions.
2Measurement precision
If precise positioning of punch carriers against fixed stops is implemented, then the pressing position control is improved, but compression deviations and thermal changes still cause errors in compact dimensions
Solution Approach 1:
The system continuously monitors the distance between fixed stops and compares it with the target distance, using this feedback to detect deviations caused by compression or thermal changes. The control device then adjusts pressing parameters to compensate for these deviations, maintaining dimensional accuracy despite environmental or material variations.
Solution Approach 2:
The patent performs preliminary measurement of the distance between fixed stops before the pressing operation. This preliminary information is used to pre-adjust pressing parameters or predict required corrections, allowing the system to compensate for anticipated compression or thermal effects before they significantly impact the final compact dimensions.
3Manufacturing precision
If powder quantity and composition are tightly controlled, then dimensional accuracy of pressed parts is improved, but production flexibility and adaptability to material variations are reduced
Solution Approach 1:
The patent enables the pressing system to adapt to material variations by dynamically changing pressing parameters based on measured deviations. Instead of requiring strict control of powder quantity and composition, the system adjusts pressing force or position in response to actual measurements, maintaining dimensional accuracy across a wider range of material conditions and improving production flexibility.
Data Source
Figure 1
Figure 2
AI summary
The method comprises pressing a pressing body to a predetermined pressing body dimension in an opening of a matrix (0) using stamps (7, 8, 17, 18) supported on stamp carriers (1, 2, 3, 4) and made of powder and/or granules, regulating an actuator (29) along a sequence of set-point values for pressing the pressing body during pressing within a pressing cycle, testing an observance of the sequence of the set-point values during the pressing, and performing a readjustment of the actuator during a deviation of the sequence of the set-point values larger than a tolerance value. The method comprises pressing a pressing body to a predetermined pressing body dimension in an opening of a matrix (0) using stamps (7, 8, 17, 18) supported on stamp carriers (1, 2, 3, 4) and made of powder and/or granules, regulating an actuator (29) along a sequence of set-point values for pressing the pressing body during pressing within a pressing cycle, testing an observance of the sequence of the set-point values during the pressing, performing a readjustment of the actuator during a deviation of the sequence of the set-point values larger than a tolerance value, and measuring an interval between a first measuring point on a first fixed stop (20, 21) that supports one of the stamp carriers onto a side of the matrix opening and a second measuring point on a second fixed stop that supports one of the stamp carriers onto an opposite side of the matrix opening for comparing the sequence of the set-point values. During pressing, 5% of the total pressing paths are determined at the last. A position of the front side edges of the first fixed stop turned towards the stamp carrier to be supported, a position of spaced markers on the fixed stops and/or a position of the measuring elements leading away from fixed stop are used as the measuring points. A position on a centrally placed first fixed stop is used as one of the measuring points, where the first fixed stop lies in a force line between the matrix opening and a force introduction area of a pressing drive. The pressing drive such as a main pressing cylinder is readjusted as the actuator. An independent claim is included for a ceramic- or metal powder press.