CNC parts quality inspection method

（1）Basic measuring tools

Micrometer: used to measure the outer diameter, inner diameter and other dimensions of parts with high accuracy.

Vernier caliper: suitable for measuring basic dimensions such as length, width and height.

Coordinate measuring machine: high-precision measuring equipment that can comprehensively detect the three-dimensional dimensions and shapes of parts.

（2）Measurement steps

Determine the measuring points: According to the part drawing, determine the key dimensional points to be measured.

Choose the appropriate measuring tool: Choose the appropriate measuring tool according to the measurement accuracy and part characteristics.

Measure and record data: Measure according to the measurement requirements and record the data accurately.

（1） Shape tolerance detection

Contour: Use equipment such as a three-dimensional coordinate measuring machine to check the degree of conformity between the contour shape of the part surface and the design model.

Roundness and cylindricity: Use equipment such as a roundness meter to measure the roundness error and cylindricity error of circular parts.

Straightness: Use tools such as a ruler and a lever dial indicator to detect the straightness of the straight part of the part.

（2）Position tolerance detection

Parallelism and verticality: Use tools such as feeler gauges and gauge blocks to check the parallelism and verticality between the surface or axis of the part.

Coaxiality: For parts with coaxial requirements, use special detection tools to measure the coaxiality error.

Symmetry: Detect the degree of symmetry of the part about a certain symmetry plane or axis to ensure that the shape and position of the part meet the design requirements.

（1）Appearance inspection

Visual inspection: Observe the surface of the part with the naked eye to see if there are scratches, pits, bulges and other defects.

Magnifying glass inspection: Use tools such as magnifying glasses to more carefully inspect the tiny defects on the surface of the part.

（2）Roughness inspection

Surface roughness measuring instrument: Used to measure the roughness of the surface of the part to ensure that it is within the specified range.

Sample block comparison method: Compare the surface of the part with the standard sample block to determine its roughness level.

（1） Sealing test

For parts with sealing requirements, perform sealing tests to ensure that the parts can meet the sealing requirements in actual use.

（2） Strength test

Perform strength tests on parts to check whether they can withstand the specified load and pressure.

（3） Hardness test

Use tools such as hardness testers to measure the hardness value of parts to ensure that they meet the design requirements.

CNC parts quality inspection is an important means to ensure product quality and reliability. Through dimensional measurement, shape and position tolerance inspection, surface quality inspection and functional inspection, various performance parameters of parts can be fully inspected. In practical applications, appropriate inspection methods should be selected according to the characteristics and requirements of the parts, and the inspection standards should be strictly followed to ensure the accuracy and reliability of the inspection results.