Universal Testing Machine Hardness Accuracy
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Solution Overview
Problem
Existing material hardness and tension/compression testing machines are limited in their ability to perform multiple types of hardness tests with precision and accuracy due to mechanical inaccuracies, such as friction and deflection, and require separate machines for different tests, which are costly and difficult to maintain.
Innovation Solution
A universal testing machine with separate test devices for Rockwell, Brinell, Vickers, Micro Vickers, and Knoop tests, featuring beam-type load cells and capacitive or optical grating displacement sensors, allowing for precise force application and measurement across a wide range, and accommodating various specimen shapes without elevating screws, with a data processing circuit for consistent results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate hardness testing machines are used to perform different hardness tests, then measurement precision and test accuracy are maintained for each specific test type, but device complexity and cost increase significantly
Solution Approach 1:
The patent creates a universal hardness testing machine that can perform multiple hardness tests (Rockwell, Brinell, Vickers, Micro Vickers, and Knoop) using a single device. The machine employs interchangeable test devices with standardized interfaces that can be quickly swapped to perform different hardness tests, eliminating the need for multiple separate machines while maintaining measurement precision for each test type.
Solution Approach 2:
The patent divides the universal testing machine into modular components: a base unit with control system and a set of interchangeable test devices. Each test device is designed as an independent module that can be attached or removed as needed. This segmentation allows the system to function as multiple specialized machines while physically being a single integrated platform.
2Adaptability or versatility
If mechanical parts such as elevating screws are used to accommodate different specimen sizes, then adaptability to various specimen shapes is improved, but measurement precision deteriorates due to friction and deflection
Solution Approach 1:
The patent replaces mechanical elevating screw systems with a direct-drive positioning mechanism. The test device applies force directly to the specimen through a controlled actuator that eliminates intermediate mechanical transmission components. This substitution removes sources of friction and deflection while maintaining the ability to accommodate different specimen sizes through programmable positioning control.
Solution Approach 2:
The patent introduces a frictionless guidance system with precision rails and linear bearings as intermediaries between the actuator and the force application point. These intermediaries provide stable alignment and support without introducing significant friction or deflection, enabling accurate displacement measurement while accommodating various specimen configurations.
3Ease of manufacture
If pancake load cells are used for force measurement, then ease of manufacture is improved, but measurement precision deteriorates with forces outside the narrow accurate range
Solution Approach 1:
The patent employs beam-type load cells instead of pancake load cells. Beam-type load cells offer superior measurement precision across a wide force range while remaining manufacturable using standard fabrication techniques. The design optimizes the beam geometry and material selection to achieve high precision for both minor forces (0.1 kg) and major forces (3000 kg), expanding the accurate measurement range beyond what pancake load cells can provide.
4Ease of operation
If mechanical levers are used to apply force through deadweights, then ease of operation is improved, but measurement precision deteriorates over time due to wear
Solution Approach 1:
The patent replaces mechanical lever systems with deadweights with an electronic feedback control system. A motorized actuator applies force to the specimen, and a load cell continuously measures the applied force. The control system adjusts the actuator in real-time to maintain the precise target force, eliminating wear-related accuracy degradation while preserving ease of operation through automated control.
Solution Approach 2:
The patent implements a closed-loop feedback control system where the load cell measurement is continuously compared to the target force value, and the actuator is adjusted accordingly. This feedback mechanism ensures consistent force accuracy over time, compensating for any variations in the system while maintaining simple operation through automated regulation.
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 accurate and versatile hardness testing across a wide range of forces and specimen shapes with reduced maintenance and cost, ensuring consistent results regardless of the test device used, while minimizing displacement errors and mechanical inaccuracies.
Implementation Method 1
beam-type load cells and capacitive or optical grating displacement sensors
Implementation Method 2
capacitive or optical grating displacement sensors
Implementation Method 3
capacitive or optical grating displacement sensors
Data Source
AI summary
A testing machine includes a stand and a test device. The stand includes a base, box frame, a slide device driven to slide by a motor, and a control system controls the force applied on the test specimen. The test device is coupled at the slide device for performing various hardness tests consisting of Rockwell hardness test, Vickers hardness test, Brinell hardness test, micro-hardness test, and tension-compression test. The test device includes a force sensor and a data processing circuit converting an analog signal of the force sensor into digital data to interface with the control system.