What are the measurement methods of CNC precision machining accuracy?

What are the measurement methods for CNC precision machining accuracy?

Machining accuracy is the degree to which the actual size, shape and position of the surface of the machined parts conform to the ideal geometric parameters required by the drawing. The ideal geometric parameter, for the size, is the average size; for the surface geometry, it is the absolute circle, cylinder, plane, cone and straight line, etc.; for the mutual position between the surfaces, it is the absolute parallel , vertical, coaxial, symmetrical, etc. The deviation of the actual geometric parameters of the part from the ideal geometric parameters is called the machining error. Kaicheng Precision is based on machine tool spindle, rotary thimble, lead screw, shaft processing, CNC lathe processing, tool holder and tool holder, quality assurance!

1. Machining accuracy According to different machining accuracy content and accuracy requirements, different measurement methods are used. Generally speaking, there are the following types of methods:

1. According to whether the measured parameter is directly measured, it can be divided into direct measurement and indirect measurement.

Direct measurement: directly measure the measured parameter to obtain the measured size. For example, measure with calipers and comparators. Indirect measurement: measure the geometric parameters related to the measured size, and obtain the measured size through calculation.

Obviously, direct measurement is more intuitive, and indirect measurement is more complicated. Generally, when the measured size or direct measurement cannot meet the accuracy requirements, indirect measurement has to be used.

2. According to whether the reading value of the measuring instrument directly represents the value of the measured size, it can be divided into measurement and relative measurement.

Absolute measurement: The reading value directly indicates the size of the measured size, such as measuring with a vernier caliper.

Relative measurement: The reading value only indicates the deviation of the measured size relative to the standard quantity. If a comparator is used to measure the diameter of the shaft, it is necessary to adjust the zero position of the instrument with a measuring block first, and then measure. The measured value is the difference between the diameter of the side shaft and the size of the measuring block, which is relative measurement. Generally speaking, the relative measurement accuracy is higher, but the measurement is more troublesome.

3. According to whether the measured surface is in contact with the measuring head of the measuring instrument, it is divided into contact measurement and non-contact measurement.

Contact measurement: The measuring head is in contact with the surface to be contacted, and there is a precise measuring force. Such as measuring parts with a micrometer.

Non-contact measurement: The measuring head is not in contact with the surface of the measured part, and the non-contact measurement can avoid the influence of the measurement force on the measurement results. Such as the use of projection method, light wave interferometry and so on.

4. According to the number of parameters measured at one time, it is divided into single measurement and comprehensive measurement.

Single measurement; measure each parameter of the tested part separately.

Comprehensive measurement: measure the comprehensive index reflecting the relevant parameters of the part. For example, when measuring the thread with a tool microscope, the actual pitch diameter of the thread, the half-angle error of the tooth profile and the cumulative error of the pitch can be measured separately.

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