Zwick creates high-precision spring tester
A
Zwick Roell product story
Edited by the Engineeringtalk editorial team
Jul 27, 2009
Zwick has developed a high-precision spring-testing instrument, which is claimed to offer fast and simple operation.
According to the company, the increasing use of powerful miniaturised mechanical and electromechanical units is influencing product development in many sectors, including the automobile industry and medical technology.
Springs used for these applications are also becoming ever smaller, but must still deliver precision and reliability, placing greater demands on testing technology.
Designed to meet this challenge, Zwick's new hand-operated spring tester records spring compression stress-strain characteristics in full, with no need to stop at the measuring points.
Load and deflection are recorded synchronously.
Intensive development work has created a concept that is said to guarantee accurate test results.
One important factor in this is the mechanical compensation of load cell deformation, ensuring maximum precision in deflection measurement under load (resolution 0.12um).
The reference line of the deflection measuring system lies along the same axis as the spring length being measured.
That practically eliminates the length measurement error.
Other important factors in providing accurate measurement are the stiff load frame and load application aligned to the specimen centreline, resulting in minimal elasticity through the entire test arrangement.
Integrated mechanical overload protection of the load cell provides reliable damage prevention, avoiding tester downtime and load cell replacement and calibration costs.
The machine features three adjustable mechanical limit switch stops for starting position, pre-stress length and minimum permissible test length.
The spring tester is suitable for production line use and in design and development, while standard interfaces enable connection of additional measuring equipment such as dimensional measuring devices.
The addition of the proven Testxpert II testing software to the manually operated spring tester produces a suitable package for testing small springs and ensures simple, quick, safe and reliable testing.
The Testxpert II program can be adapted to the requirements of spring testing.
Contents include integrated histogram and statistics functions, pre-defined specific results, online graph and test result recording and optional statistical process control (SPC) functions, while flexible, efficient interfaces allow Testxpert II to communicate with an organisation's IT infrastructure.
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Contact Zwick Roell
Tel (Germany) ++49 7305-10-0
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