When the creep is too large and it is difficult to secure the A size with the adjustment lining, the product must be replaced. Height measurement test For metal-rubber composite conical springs, 8 or 4 are generally installed on each bogie. In order to ensure the balance of the height of the vehicle, it is necessary to carry out the height measurement test under load.
The elastic properties of metal-rubber composite conical springs vary with temperature. Therefore, the test product must be thermostated for more than 24 hours in a 20e25e environment prior to testing. At the same time, rubber is a polymer material. Therefore, before any test, the product must be pre-pressed five times five times under the specified load to eliminate the internal stress of the product.
The height measurement test under load is 205 mm height dimension marked in the measurement when the vertical load is 18175 kN. The size measurement results are required to be in the range of 20412 mm 20518 mm. If the dimension is not within the required tolerances, the dimension can be placed within the required tolerance by adding a spacer. This size should be measured 100%.
During the test, the height of 4 points was measured and the arithmetic mean was taken as the measurement result. The height measurement results of 4 points are: H1=205113mm, H2=205164mm, H3=205172mm, H4=205136mm. The arithmetic mean of the four point heights is: H=(H1+H2+H3+H4)/4=205146( Mm).
Normal temperature static test normal temperature vertical stiffness test test method and parameter requirements This test is carried out on the CSS55100 microcomputer control electronic universal. The product is preloaded 011kN vertically, at which point the displacement is 0; then it is loaded at a constant speed of not more than 30mm/min, so that the vertical compression deformation is deformed from 0 to 75mm, and then unloaded. This is a cyclic preload. Three cycles of preloading are performed continuously, with no time interval between each cycle.
After the preloading is completed, the interval is 15 min, and it is loaded again in the vertical direction. The position at the time of vertical loading of 011 kN is 0 o'clock, the vertical compression deformation is deformed from 0 to 65 mm, and the load-deformation curve is recorded. The vertical stiffness of the product is calculated during the rising half cycle of the load-deformation curve (compression half cycle). The vertical static performance parameters of the product are as follows: (1) The vertical deformation of the product is 0175kN/mm in the range of 065mm, and the stiffness tolerance range is -11%9%, that is, the stiffness range is 0167kN/mm0182kN/mm. Test data processing Method (2) The vertical stiffness of the product must be nearly linear in the range of deformation to 030 mm.
After the data processing test is completed, the load-deformation hysteresis curve as shown is drawn by the computer. For the determination of the lateral stiffness, the sum of the absolute values ​​of the load values ​​corresponding to the +5 mm and -5 mm points is divided by 10 mm, and the obtained value is the transverse stiffness value corresponding to the given deformation range.
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