Metal material tensile testing machine common error and elimination method - Database & Sql Blog Articles

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Metal material tensile testing machine will produce some large or small errors for one reason or another during the use. Let us briefly explain the common error generation method and elimination method.
1. The error caused by the incorrect installation of the rubber tensile testing machine is not level, which will increase the friction between the moving parts and affect the vertical installation, thus bringing errors to the tensile machine.
(1) When the main part is installed, the friction between the horizontal working piston and the working cylinder will be generated. The friction between the working platform of the tension machine and the one side column will also generate friction, which will cause errors, which are generally positive. And the error decreases as the load increases.
(2) The dynamometer part is not installed horizontally. If the dynamometer is not installed horizontally before and after, the frictional force will be generated between the pendulum shaft bearings, and the error is generally negative.
The combination of the above two factors produces errors that have a large impact on small loads and a small impact on large loads.
2 Error caused by frictional resistance Main part frictional resistance The frictional resistance of the hydraulic tensile machine mainly occurs between the working cylinder and the working piston. In addition to the installation of non-level factors, there is dirt in the cylinder, the viscosity of the oil is too large, it will also increase the frictional resistance. In addition, improper positioning of the guide wheel of the working platform may also cause an increase in friction with the side column.
There are many reasons for the frictional resistance of the dynamometer part of the frictional resistance dynamometer. For example, there is dirt between the force measuring cylinder and the force measuring piston. The viscosity of the oil is too large, and the driven needle on the indicating device has large friction force. There is oil, dirt or the upper limit of the toothed rod on the rod is too tight, and the force measuring piston belt is worn and broken.
3 Elimination method For the above error, first check whether the tension machine is installed horizontally, and level the horizontal level of the main cylinder with the frame level on the outer circumference of the working cylinder. Adjust the level of the dynamometer before and after the dynamometer on the front of the pendulum, and align the edge of the pendulum with the inner scribe line. Use the horizontal ruler to adjust the left and right horizontal of the body against the side of the oscillating bar. The oil in the cylinder can be drained and replaced with oil of suitable viscosity. The dynamometer indicating device has too much friction from the moving needle, and the gear rack is too dirty. It can be cleaned with gasoline and adjust the pressing screw and the upper limit plate of the rack. The belt on the force measuring piston can be replaced, which can eliminate the error. To make the tensile machine reach the qualified state of use.