This paper describes the design and construction of the hydraulic amplification force standard machine of 30 MN (so-called Pascal-type), which will be the biggest force standard machine by hydraulic amplification in the world. The main elements and the most critical components of the machine were expounded, including the hydrostatic support cylinder and the dead-weights groups, which directly affect the system accuracy, and determine the measurement range. The performance of the machine maximises the use value for the user. This machine will play a very important role in promoting the development of high-precision large force metrology technology.
In order to solve the problems of the existing standard Brinell hardness machine such as low automation, the time-consuming indentation measurement and the human influence in indentation measurement, a calibration machine for reference block was designed. It shows that this machine can reduce the influence of the temperature difference between the hardness block and the measurement platform; it eliminates the time for the indentation measuring system to find the indentation and juxtapose it with the centre of the field of view and implements fully Brinell hardness automatic calibration.
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