Press Load Measuring Apparatus for Inertial Force Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing press load measuring methods inaccurately measure press loads due to the impact of slide inertial forces during acceleration and deceleration, leading to errors and confusion in understanding the causal relationship between press load and molding results, especially in large-sized press machines.
Innovation Solution
A press load measuring apparatus that includes strain gauges attached to the columns of a press machine, an inertial force calculator to calculate the slide inertial force, and a press load calculator to eliminate this force from the measured strains, allowing for accurate calibration of press loads and partial loads during acceleration and deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are attached to columns to measure press load, then press load measurement is enabled, but measurement precision deteriorates due to slide inertial force impact during acceleration and deceleration
Solution Approach 1:
The patent extracts and separates the inertial force component from the total measured force. By calculating the inertial force independently using mass and acceleration data, and then subtracting it from the total measured press load, the system isolates the actual press load from the erroneous measurements caused by inertial effects during slide acceleration and deceleration.
Solution Approach 2:
The patent introduces an intermediary calculation layer that processes the relationship between mass, acceleration, and force. By using the intermediary relationship F=ma to compute inertial force, the system creates a correction mechanism that mediates between the raw sensor measurements and the actual physical press load, enabling accurate measurement despite the presence of inertial disturbances.
2Productivity
If press load is measured during slide acceleration and deceleration, then operational data is captured, but measurement reliability deteriorates due to inertial force errors
Solution Approach 1:
The patent implements a feedback correction mechanism where the calculated inertial force is continuously subtracted from the measured press load during slide acceleration and deceleration phases. This feedback loop ensures that the measurement system compensates for inertial effects in real-time, maintaining reliability while capturing operational data throughout the complete stroke cycle.
Solution Approach 2:
The patent performs preliminary calculation of the inertial force component before finalizing the press load measurement. By pre-calculating the inertial force using mass and acceleration data, the system prepares correction values that are then applied to the raw measurements, ensuring accurate press load data is obtained even during dynamic acceleration and deceleration phases.
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
Enables precise measurement of press loads and partial loads shared by columns, reducing errors caused by slide inertial forces and improving the accuracy of press load measurements, even during the acceleration and deceleration of the slide.
Implementation Method 1
a plurality of strain gauges attached to a plurality of columns of the press machine respectively, the plurality of strain gauges detecting respective strains generated in the plurality of columns in association with a press load acting on a slide of the press machine
Implementation Method 2
an inertial force calculator configured to calculate a slide inertial force proportional to a product of a mass of the slide and a member connected to the slide and an acceleration of the slide
Data Source
AI summary
A press load measuring apparatus includes: strain gauges attached to respective columns of a press machine and configured to detect strains generated in the respective columns respectively in association with a press load acting on a slide of the press machine, an inertial force calculator configured to calculate a slide inertial force proportional to a product of a mass of a slide and a member connected to the slide and a slide acceleration detected by an acceleration detector, and a press load calculator configured to calculate press partial load signals before calibration based on a strain signals detected by the strain gauges, eliminate a slide inertial force signals from the press partial load signals before the calibration, and calculate calibrated press partial load signals.