Technical articles use and maintenance talk about the selection of pneumatic measuring instrument Changzhou Diesel Co., Ltd. Metrology Division Wang Lizhou uses contact measuring gage, it is difficult to ensure accurate deformation of the workpiece measurement data. Pneumatic measurement, in its superiority in measurement methods, is increasingly used in the machinery industry. The selection of the measuring instrument is two parts of the component body and the measuring head. In the following, the nominal magnification of the body of the measuring instrument is fixed. When the magnification of the existing measuring instrument body is selected, different measuring instrument bodies can be selected according to the dimensional tolerance of the workpiece to be tested. The principle of selection is that the tolerance bandwidth is selected by a lower magnification meter, and the tolerance band is narrower, and a higher magnification meter is used. That is, the high accuracy required for high accuracy, the low accuracy required for low accuracy is generally recommended. For example, the F tolerance band range is 8.010. The ten measuring instruments can be used with different measuring heads, as long as the tolerance band range is met.
The measuring head is custom-made according to the size and tolerance of the workpiece to be tested. The measuring head is designed according to the type and characteristics of the workpiece to be tested, and has various nozzles, one-way nozzle two-way nozzle; one nozzle to nozzle. The more nozzles, the higher the accuracy of the relative measurements, but the more complex the manufacturing process, the corresponding cost increases. Therefore, when selecting the measuring head, the relationship between measurement accuracy and manufacturing cost should be considered comprehensively, and the appropriate measuring head should be selected. When customizing the measuring head, it is necessary to use the calibration rule of the custom sleeve and the tolerance belt, so that in actual use, the measuring instrument can be inserted into or inserted into the workpiece to be tested, and then the buoy of the measuring instrument can be obtained. The position shows whether the size of the workpiece to be tested is out of tolerance and how much is worse. In particular, when the inner and outer diameters of the workpiece are measured pneumatically, the average size of the workpiece is measured.
The pneumatic measuring instrument of our factory is mainly used for the selection and measurement of the cylinder liner in the production field. It has played a very good role in the actual work and achieved good results. Analysis of the variability of the hardness tester Zhang Yong, Institute of Metrology and Testing Technology, Gaoyou City, Jiangsu Province In the daily maintenance work, we often encounter the variability of the hardness value. The following 150 people are now at Rockwell. example. Perform phase separation First, clean the various parts of the hardness tester to be repaired, and install the hardness tester on a stable foundation, adjust to the horizontal position, and then analyze the cause of the variability, mainly from the following parts. 1. Loading mechanism Partially check whether the test bench is firmly mounted on the lead screw, whether the lead screw is loose, whether the test stand is poorly clamped or the tip of the indenter is 50%, 1 is the total tenth. 5 cut 2000 injuries.
If the upstream code of the afterburner lever is loose, it will become unstable. The knife and the pad should be loosened if the lever is tightened. If it is loose, the upper shoulder plane of the spindle 1 should be fixed. The working surface of the knife pad on the frame is not smooth and flat, causing the test force to be unstable, and the working surface should be adjusted or repaired.
After the blade of the upper knife is not on the plane or not parallel to each other, the lever ratio will change frequently, and the test force will be unstable. In this case, the knife should be ground or adjusted so that the blades are on the same plane and parallel to each other.
If the damper piston drops unevenly, check the cylinder for oil or air. If there is air, pull the handle back and forth to remove air and inject the appropriate oil.
Is there any friction between the pointer and the dial or the glass cover?
Check that the measuring lever rotates around the fulcrum and measure whether the tip of the tapered screw on the mast is smooth.
The rack bar and the gear and the gear shaft are loosely engaged, the rack bar is oscillated radially, and the screw on the bearing housing is loose. Imitation 1 variability meter
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