Strain Gauge Substrate Thermal Matching for Load Cell Stability
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Solution Overview
Problem
Conventional load cell manufacturing processes require time-consuming compensation for temperature characteristics after strain gauges are attached, leading to variations in temperature characteristics, which complicates the production of load cells with excellent temperature stability.
Innovation Solution
A strain gauge component with a substrate made of aluminum or stainless steel, matching the strain body's properties, is used, along with a bonding portion cured by heat treatment, to minimize temperature characteristic changes before and after attachment, allowing for the selection of strain gauges with equivalent temperature characteristics and automation of the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strain gauges are attached to the strain body using conventional methods, then the strain gauge can be installed on the strain body, but the temperature characteristic varies before and after attachment, requiring time-consuming compensation steps
Solution Approach 1:
The substrate is pre-heated to a specific temperature (e.g., 80°C to 150°C) before attaching the strain gauge. This preliminary heating action ensures that the substrate and strain gauge reach thermal equilibrium, preventing temperature characteristic variations after attachment and eliminating the need for post-attachment compensation steps.
Solution Approach 2:
The temperature of the substrate is changed to a controlled range (80°C to 150°C) during the attachment process. By controlling this temperature parameter, the thermal expansion coefficients of the substrate and strain gauge are matched, maintaining consistent temperature characteristics before and after attachment, thereby reducing manufacturing time.
2Manufacturing precision
If strain gauges with the same temperature characteristic are selected before attachment, then the temperature characteristic should be equivalent, but it varies after attachment to the strain body
Solution Approach 1:
The substrate is pre-heated to a specific temperature (e.g., 80°C to 150°C) before attaching the strain gauge. This preliminary heating action ensures that the substrate and strain gauge reach thermal equilibrium, preventing temperature characteristic variations after attachment and eliminating the need for post-attachment compensation steps.
Solution Approach 2:
The temperature of the substrate is changed to a controlled range (80°C to 150°C) during the attachment process. By controlling this temperature parameter, the thermal expansion coefficients of the substrate and strain gauge are matched, maintaining consistent temperature characteristics before and after attachment, thereby reducing manufacturing time.
3Reliability
If temperature compensation steps are performed after strain gauge attachment, then the temperature characteristic can be corrected, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The substrate is pre-heated to a specific temperature (e.g., 80°C to 150°C) before attaching the strain gauge. This preliminary heating action ensures that the substrate and strain gauge reach thermal equilibrium, preventing temperature characteristic variations after attachment and eliminating the need for post-attachment compensation steps.
Solution Approach 2:
The temperature compensation step is extracted and eliminated from the manufacturing process. By performing preliminary heating of the substrate before attachment, the need for subsequent temperature compensation is removed, simplifying the manufacturing process while maintaining reliable temperature characteristics.
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
This approach simplifies the load cell manufacturing process by eliminating the need for temperature compensation steps, ensuring consistent temperature characteristics and enabling accurate, automated assembly, resulting in load cells with improved temperature stability and measurement accuracy.
Implementation Method 1
a bonding portion disposed between the insulator and the substrate and cured by heat treatment
Implementation Method 2
a resistor attached to the base and having an electric resistance value varying according to a degree of change of the strain body
Data Source
AI summary
A strain gauge component includes: a strain gauge including an insulator having an insulating property and a resistor disposed on the insulator and having an electric resistance value varying with deformation of a strain body; and a substrate on which the insulator of the strain gauge is disposed, and the substrate is formed of a metal containing aluminum or stainless steel having the same properties as the strain body.