Measurement method of machining accuracy of mechanical parts

Machining of mechanical parts is mainly for machining very high precision parts. Such parts are used in different fields of application. The precision of machining of mechanical parts will directly affect the measurement parameters. Measurement accuracy can be applied according to different conditions. What are the methods of measuring the accuracy of mechanical parts machining?

Mechanical parts processing can be divided into measurement and relative measurement according to whether the reading value of the measuring instrument directly represents the value of the measured specification.

Absolute measurement: the reading value directly represents the size of the measured specification, such as measurement with micrometer.

Relative measurement: The reading value only indicates the error of the measured specification relative to the normative quantity. If a voltage comparator is used to measure the diameter of the shaft, the zero position of the instrumentation should be adjusted using the gauge block first, and then the measurement should be carried out. The difference between the measured value side shaft diameter and the block gauge specification is the relative measurement value. In general, the relative measurement is more accurate, but the measurement is more inconvenient.

Mechanical spare parts processing is divided into contact measurement and non-contact measurement according to whether the measured surface is in contact with the measuring head of the detector.

Contact measurement: the measuring head touches the surface to be contacted and has a precise measuring force. For example, parts are measured with vernier calipers.

Non-contact measurement: The measuring head does not touch the surface of the part to be measured. Non-contact measurement prevents the measuring force from harming the measuring effect. Such as the choice of projection method, light wave intervention method, etc.

Mechanical parts processing can be divided into direct measurement and indirect measurement according to whether the measured parameters are directly measured.

Direct measurement: direct measurement of the measured parameters to obtain the measured specifications. For example, the application of calipers with meters and voltage comparators to carry out measurements. Indirect measurement: The graphical parameters related to the measured specification are measured and the measured specification is obtained according to the calculation.

Obviously, direct measurement is more visualized for part processing, while indirect measurement is more inconvenient. Generally when the measurement specifications or direct measurement can not meet the accuracy requirements, it is forced to choose indirect measurement.

The above explanation is the mechanical parts processing accuracy measurement method, hope to see can help you!