Spring pressure test generally uses electronic digital spring tension and compression testing machine. Electronic digital spring tension and compression tester is a special instrument to test the deformation and load relationship characteristics of tension and compression springs. Applicable to the test of the working load of the tension and compression spring under a certain working length. It can also be used for the elastic load test of elastic devices such as rubber and reed.
The stress test on the hardware spring is generally divided into the following steps:
1 )Before the formal inspection and determination, the spring is first compressed to the test load. When the test load is larger than the pressure and the load is heavy, the combined load is taken as the test load, but the maximum compressive force does not exceed 1.5 times the constant pressure and the load. .
2 )Prepare the load test before the determination: use a third-class gauge dynamometer of corresponding range or draw more than one precision weight to carry out survey on the load testing machine to ensure that the precision of the test machine is not less than 1%; Tester length reading error.
3) Metal spring pressure test to a specified height Determination: Place the same height and height as the specified height in the center of the platen of the load tester. Load the load near the nominal value of the pattern on the block. Lock the set screw or the locating pin. Pull out the measuring block, put it into the spring to be tested, adjust the zero position, and remove the weight of the spring; press the spring to the specified height and read out the corresponding load; correct the reading according to the error of the calibrated load tester.
4) Press the upper pressure plate to the position just in contact with the spring. The load testing machine predicts the value F0≈0.05F. Record the reading of the initial reading of F0 and the length indication of the heavy load test. The subsequent reading will change the reading of the length. Has reached a defined amount of change.