3results about How to "Accurate confirmation" patented technology

The invention discloses an erosive wear device suitable for a servo valve and a test method, which are used for solving the problems that a plunger pump is not resistant to pollution, a gear pump is difficult to supply high pressure, and the multi-factor synergistic effect cannot be investigated in the existing test. The device comprises a polluted oil source, a clean oil source, a pressurization system and a tested piece system. Wherein the polluted oil source adopts a gear pump to supply oil, and is provided with a stirrer, a heater and a pollution degree detector; the pressurization system comprises a double-acting pressurization cylinder, a servo valve and an energy accumulator and can output high-pressure stable oil liquid. The clean oil source is used for driving pressurization and adjusting the pollution degree of the main oil way. During testing, a high-pressure mode and a low-pressure mode are switched through the three-way ball valve, and temperature and pollution degree adjustment is integrated. According to the invention, high-pressure and high-pollution-degree test oil liquid can be provided, and collaborative research of multiple factors such as pressure, temperature and pollution degree is supported, so that the test period is remarkably shortened.

This invention relates to a method for confirming the virtual center position of an ultra-precision machine tool based on straight groove cutting. The workpiece and a diamond turning tool are fixed on the C-axis and B-axis of the ultra-precision machine tool, respectively. The workpiece is turned to eliminate Z-axis tool setting errors. After tool setting is completed using a tool setter, the initial virtual center position is recorded, and the diamond turning tool is controlled to plan the first straight groove. The virtual center function is activated, and the B-axis is rotated by an angle α, controlling the diamond turning tool to plan the second straight groove. Then, the B-axis rotation angle is adjusted to -2α, controlling the diamond turning tool to plan the third straight groove. The depth of the three straight grooves is measured along the Z-axis and recorded. The angle θ between the initial virtual center, the actual virtual center, and the B-axis rotation center, as well as the distance L' from the actual virtual center to the B-axis rotation center, are calculated to confirm the position of the actual virtual center. When machining complex feature structures, this invention can greatly improve the efficiency of toolpath programming, effectively reduce machining path deviations, and improve the surface quality of ultra-precision machining.

The application discloses a detection method of a digital weighing display, a digital weighing display test system based on a strain type weighing sensor simulator, and the digital weighing display test system comprises a strain type weighing sensor simulator, an A / D analog-digital converter, an analog display device and a digital weighing display. The detection method comprises the following steps: confirming a nominal load value I0 corresponding to an output signal C0 of the weighing sensor simulator; confirming a weighing value I1 received by the analog display device and a weighing value I2 output by the analog display device according to analog signal information output by the weighing sensor simulator; confirming a display weighing value I3 of the weighing display; and judging whether the digital weighing display meets the standard or not. The method can compensate for the requirement that the output signal of the weighing sensor simulator used for detecting the digital weighing display is completely linear, and can better detect the measurement performance of the digital weighing display.