AsPhysical and mechanical testing machinemay often have customers complain that the tensile testing machine they purchased is inaccurate, and there are discrepancies with the comparative data of other brands. In this article, let's understand what are the reasons for the inaccuracy of the rubber tensile testing machine.
There are many reasons for the rubber tensile performance test, which can be divided into three aspects:1The influence of the process, such as the mixing process, the vulcanization process, etc.;2.Effect of test conditions;3.Impact of test equipment.
In the process of mixing, the rubber must ensure that the mixing is uniform, and the rubber material in the same area should be compared for the test, and the rolling direction should be indicated when cutting. Ensure that the vulcanization mold, vulcanization temperature, vulcanization time, auxiliary time, parking time, etc. are consistent.
The influencing factors of the test conditions are: laboratory temperature, specimen width, specimen thickness and so on.
Rubber tensile testing machineThe precision and accuracy, such as whether the force value is accurate, whether the displacement is accurate, and whether the speed meets the requirements. The user can preliminarily check whether the force value is accurate by hanging weights, check whether the elongation tracking distance is consistent with the displayed value with a ruler, and check the moving speed of the beam or fixture with a ruler and stopwatch
2.The tester should confirm that the specimen should be in a vertical free state before the tensile test, that is, the specimen is neither subjected to tensile pressure nor in a bending state, and should pay more attention to the phenomenon that the clamp has not slipped or clamped the specimen in the process of stretching, and should pay special attention to the clamp blessing force of the large deformation extensometer should be appropriate, too tight will affect the accuracy of the test data, too loose will slip with the specimen, affecting the accuracy of elongation.
3.For rubber tensile machines equipped with more than two sensors, before the experiment, check whether the specifications of the selected sensor are consistent with the range displayed by the control system, and often check whether the large deformation tracking clip moves freely on the guide rod, if the resistance is too large, gasoline cleaning or overhaul should be applied, and check whether the initial gauge distance of the tracking clamp meets the test requirements and is consistent with the settings in the control system.
In addition, there are also auxiliary equipment and devices on the sample preparation, such as the accuracy of the processor, grinding machine, cutter, mold and different testers.
To sum up the above, there are many factors that affect the inaccuracy of the rubber tensile machine, from people to machines, etc., to analyze, first to ensure the stability of the test personnel, regular training;Regular inspection, sample consistency, rationality of methods, and environmental optimization give full play to the excellent performance of the rubber tensile machine.
Fuller Instrument is a manufacturer of physical and mechanical testing machines, the main products are: tensile machine, pressure testing machine, fatigue testing machine, torsion testing machine, high temperature universal testing machine, pendulum impact testing machine, drop weight impact testing machine, etc.