Press Load Measuring Apparatus Bending Moment Compensation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Press machines of the 1-point type face inaccuracies in measuring press partial loads due to bending moments acting on columns, leading to errors in strain detection by strain gauges, which complicates the inspection of causal relationships between press loads and molding results.

Innovation Solution

A press load measuring apparatus that includes strain gauges attached to columns, a bending moment calculator to determine bending moments based on the angle between the slide's movement direction and the connecting rod, and a press partial load calculator that eliminates the impact of bending strain components from detected strains to accurately calculate press partial loads.

Engineering Contradictions & Design Principles

VSEngineering 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 bending moments acting on columns

Engineering Contradiction:

Improvepress load measurement accuracyVSAvoidbending moment impact on strain detection

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent segments the strain detection into two independent components: press load strain and bending moment strain. By using separate strain gauges for each component (strain gauges 10L/10R for press load, strain gauges 20L/20R for bending moment), the system can independently measure and process each strain type, eliminating the interference between them and improving measurement precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces bending moment calculation as an intermediary process. The bending moment calculator computes bending moments based on the angle between the connecting rod and vertical direction, then the press partial load calculator uses this information to eliminate bending strain components from the total strain measurements, thereby isolating the pure press load measurement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If bending moment calculation and elimination is implemented, then press load measurement accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvepress partial load measurement accuracyVSAvoidmeasurement system structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The press partial load calculator performs multiple functions: it receives both press load strain signals and bending moment strain signals, calculates bending moments from geometric parameters, eliminates bending components, and outputs corrected press partial load values. This multi-functionality reduces the need for separate dedicated components for each processing step.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent replaces physical mechanical separation of load paths with computational separation. Instead of using separate physical measurement systems for press load and bending moment, the system uses a single strain gauge setup combined with computational algorithms to distinguish and eliminate bending components, reducing hardware complexity while maintaining measurement accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 partial loads without errors caused by bending moments, improving the accuracy of press load measurement and facilitating better understanding of molding processes.

Implementation Method 1

strain gauges detecting respective strains generated in the plurality of columns in association with a press load acting on the slide

Methodology Applied

Scientific EffectStrain gauge resistance change: Piezoresistive Effect

Data Source

PatentUS11331871B2Press load measuring apparatus and method for press machine

Publication Date: 2022.05.17 AIDA ENGINEERING LTD

AI summary

A press load measuring apparatus for a press machine of 1-point type includes: a plurality of strain gauges attached to the respective columns of the press machine, the plurality of strain gauges detecting respective strains generated in the respective columns in association with a press load acting on the slide; a bending moment calculator configured to calculate bending moments acting on respective columns based on an angle formed between a direction of movement of the slide and the connecting rod; and a press partial load calculator configured to calculate press partial load signals corresponding to the respective columns, an impact of bending strain components caused by the bending moments included in the strain signals being eliminated from the press partial load signals based on the bending moments acting on the respective columns detected by strain gauges attached to the respective columns.