China Instrument Network Instrument Development The span value is a measure of the involute spline. The measurement accuracy is high and it is widely used in production. Recently, a length measurement scientific research achievement “a fixture for measuring the span value†of the Measurement Testing Institute of Suzhou City, Jiangsu Province has obtained the invention patent certificate issued by the State Intellectual Property Office. This is the fifth invention patent obtained by the company.
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For the measurement of the span value, two equal-sized and appropriately sized rods need to be selected and placed in the two splines of the spline-pair diameter (by offsetting the half-pitch for the odd-numbered splines), and then the universal The measuring instrument, such as the metric, the indicating micrometer, the indicating caliper, the length measuring instrument, the three-dimensional coordinate, etc., can be measured. The distance between the two measuring rods is measured as the span value. However, when there is no universal gauge for measuring the span, and the tangent of the equator and the part to be measured is tangent to the line, it is very difficult to make close contact between the rod and the gullet. In the measurement of the cross-bar distance, the amount of rods is fixed. At present, there are no fixtures specifically used for the fixed rods in the country.
In the past, the traditional method of using a person's hand or using plasticine to fix the measuring rod has made it difficult to grasp the optimal position for finding the rod, because of the instantaneous nature and instability of the hand, which would cause the rod to be not in the vertical plane. Internally, resulting in inaccurate cross-bar distances; the use of plasticine to fix the ends of the measuring rod, due to the natural plasticity and elasticity of the plasticine, it is easy to promote deformation of the plasticine during measurement and eventually lead to changes in the position of the measuring rod, and The measured objects (gutters) may not all be tangent to each other, and there may be gaps. The accuracy of measurement data is not high, and it is difficult to obtain stable and accurate span values. Therefore, these stick fixing methods have poor repeatability and are relatively time-consuming. , And the operation is cumbersome and inefficient, thus directly affecting the efficiency of the test.
In order to overcome the deficiencies of the existing technologies, the Metrology Research Team of Suzhou City has explored and provided a fixture with a simple structure, high repeatability, and high stability to measure the span value of the span. It has been approved by many parties and has successfully acquired the country. Patent certificate issued by intellectual property rights.
The scientific research results come from the research and practice of the measurement methods of the internal and external spans of gear parts, spline parts, and various spline gauges conducted by the team of precision mechanical inspection offices of the Metrology Institute for many years. “A fixture for measuring the span value of the span†has a simpler structure and stronger stability than the traditional fixed stick measurement method, and has a high practical promotion value.
(Original title: The results of the Suzhou Institute of Measurement won the national invention patent)
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