Talking about the selection of pneumatic measuring instrument Wang Lizhou Changchai Co., Ltd., Changzhou 213002 outlines many traditional measuring tools in the mechanical industry, such as vernier calipers, micrometers, and percentages. These measurement methods are all contact measurement. For some workpieces that are prone to deformation, such as the cylinder liner on the diesel engine produced by our company, due to the human factors of the measurement personnel, such as measurement experience, uneven measurement force, etc. It is possible to cause the workpiece to deform during the measurement process, which affects the reliability of the measurement data. Pneumatic measurement has many pneumatic measurement characteristics because of its measurement method. The pneumatic measurement instrument is a new type of precision length measuring instrument used in the mechanical manufacturing industry. It converts the change of the workpiece size into the error of the compressed air to measure the workpiece size. . The pneumatic measuring instrument is composed of two parts: the measuring instrument body and the measuring device. Pneumatic measuring instruments mainly have some advantages. 1. Application range The measuring instrument body can be used with different pneumatic measuring heads to measure the physical quantity of the workpiece. Especially for some measurements that are difficult to solve with mechanical measuring tools, such as the inner diameter of the sounding hole, the inner diameter of the small hole, etc. It is easy to achieve the accuracy of the 2 measuring 4 accuracy. The high magnification of the high measuring instrument can meet the requirements of the precision measurement. At the same time, the human error of the measuring instrument is small, no matter how skilled the operator is, it will not affect the measurement accuracy.
The measurement efficiency meter is easy to operate, easy to read, and capable of continuous measurement. Should be tested in large batches to test the high efficiency.
It can easily realize non-contact measurement and measurement, and it is easy to realize that the measuring head is not in direct contact with the measured surface, which can not only reduce the influence of the measuring force on the measurement result, but also avoid scratching the workpiece surface, and at the same time, because it is a non-contact measurement, the measuring head it. It can reduce wear and prolong the use of life. The selection of the measuring instrument and the selection of the measuring head are two parts. The nominal magnification of the measuring instrument body is fixed. The magnification of the existing measuring instrument body is 2000 times 5000 times 10000 times. In the specific selection, different tolerances can be selected for the tolerance of the workpiece. 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 to say, the high precision is required, the high magnification is selected, and the low precision is selected. It is generally recommended to use the following values ​​as the tolerance band range meter.
The same gauge can be used for different measuring heads as long as the tolerance band range is met.
The selection of the measuring head is like a different type of nozzle according to the size and tolerance of the workpiece to be tested. There are one-way nozzles, two-way nozzles, nozzles, nozzles, etc., and more nozzles, such as six-way. To the nozzle. The more nozzles, the higher the accuracy of the measurement, but the higher the cost, because the manufacturing process is also complicated. Therefore, when selecting the measuring head, it is necessary to comprehensively consider the relationship between measurement accuracy and manufacturing cost, and select the correct calibration rule with matching, so that in actual use, the measuring instrument should be first calibrated, and then the measuring head can be inserted or inserted into the workpiece to be tested. It can be seen from the buoy position of the measuring instrument whether the size of the workpiece to be tested is outdated and the difference is too large.
In particular, when measuring the inner and outer diameters of the workpiece with a pneumatic measuring instrument, it is measured.
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