Modular Hardness Tester with Motorized Presshead
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Solution Overview
Problem
Traditional hardness testers face inaccuracies due to mechanical wear and limitations in applying force in multiple directions, making them unsuitable for complex-shaped specimens and workshop environments.
Innovation Solution
A modular hardness testing machine with a strain gage load cell, capacitive or optical grating displacement sensors, and a closed-loop digital control system, allowing force application in any direction and accommodating various specimen shapes, with interchangeable frames and indenters for precise measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If mechanical parts and levers are used to amplify force, then the required force (150 kg) can be achieved with a lighter deadweight (15 kg), but the mechanical parts wear down over time causing force inaccuracy
Solution Approach 1:
The patent replaces the mechanical lever system with an electric motor and lead screw mechanism to apply the required 150 kg force. This substitution eliminates the wear and tear issues of mechanical levers while maintaining the force amplification capability, thereby improving force accuracy and reliability over time.
Solution Approach 2:
The patent implements a feedback control system using a load cell to continuously monitor the applied force and adjust the motor output accordingly. This closed-loop feedback ensures that the exact required force is applied consistently, compensating for any variations and maintaining high force accuracy throughout the machine's operational life.
2Measurement precision
If moving mechanical parts are used for measurement, then the indentation depth can be measured, but friction and lost displacement occur between moving parts impairing repeated accuracy
Solution Approach 1:
The patent replaces the mechanical dial indicator with a capacitive or optical grating displacement sensor that measures indentation depth without mechanical contact. This eliminates friction and lost displacement between moving parts, significantly improving repeated measurement accuracy while maintaining the ability to measure indentation depth.
3Device complexity
If a single device design is used, then the structure is simple, but it cannot test complex-shaped specimens or apply force in multiple directions
Solution Approach 1:
The patent divides the hardness testing machine into modular components: a base unit with motor and control system, interchangeable frames for different test configurations, and replaceable indenters for different hardness scales. This segmentation allows the core structure to remain simple while providing versatility through modular attachments, enabling testing of complex-shaped specimens and application of force in multiple directions.
Solution Approach 2:
The patent designs the machine with universal capabilities to perform multiple hardness test types (Rockwell, Brinell, Vickers, etc.) using a single base unit with interchangeable components. The motorized presshead can apply force vertically or at angles, and different frames accommodate various specimen shapes, making one device suitable for diverse testing requirements without sacrificing structural simplicity.
4Reliability
If deadweight testers are used, then force can be applied consistently, but the mechanical imprecision over time and heavy weight make them unsuitable for workshop environments
Solution Approach 1:
The patent replaces the heavy deadweight mechanism with a motorized drive system that uses an electric motor and lead screw to apply force. This substitution dramatically reduces the machine's weight and size while maintaining force consistency through electronic control and load cell feedback, making the machine portable and suitable for workshop environments.
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 solution provides highly accurate, efficient, and cost-effective hardness testing across multiple methods and specimen types, reducing maintenance needs and enhancing usability in workshop settings.
Implementation Method 1
A module for performing various hardness tests which specializes in indentation hardness testing. The module comprises a measuring component and a set of frames. The user selects the frame according with the test specimen and with the measuring component easily composes the hardness testing machine.
Implementation Method 2
A modular hardness testing machine with a strain gage load cell, capacitive or optical grating displacement sensors
Implementation Method 3
A modular hardness testing machine with a strain gage load cell, capacitive or optical grating displacement sensors
Implementation Method 4
A modular hardness testing machine with a strain gage load cell, capacitive or optical grating displacement sensors, and a closed-loop digital control system
Data Source
AI summary
A modular hardness testing machine has a measuring component and a set of frames. The measuring component includes a housing and locating slot. The measuring component has a locating slot configured to receive a frame. The locating slot allows a user to modularly interchange the frame. The measuring component's housing encloses a presshead, which encloses a load cell having through-holes holding transmission pins. The first end of each transmission pin contacts a displacement measurement sleeve, and a second end contacts a transmission plate. A motor is mounted to the housing. The motor is connected to a reduction drive. The reduction drive reduces speed and drives a lead screw mounted on a bearing mount, and a moveable presshead is driven by the lead screw.