Knowledge about Machining Accuracy

Machining accuracy is the degree of conformity between the three geometric parameters of the actual surface size, shape, and position of the part after machining and the ideal geometric parameters required by the drawing. The ideal geometric parameter is the average size for the size; for the surface geometry, it is the absolute circle, cylinder, plane, cone, and straight line; for the mutual position between the surfaces, it is absolutely parallel , Vertical, coaxial, symmetrical, etc. The deviation between the actual geometric parameters of the part and the ideal geometric parameters is called machining error. The CNC Machining Bike Parts Exporter will introduce it to you below.

Machining accuracy is mainly used to produce products. Machining accuracy and machining errors are terms used to evaluate the geometric parameters of the machining surface. Machining accuracy is measured with tolerance grades. The smaller the grade value, the higher the precision; the machining error is expressed by a numerical value. The larger the value, the greater the error. High processing accuracy means small processing error and vice versa. The actual parameters obtained by any machining method will not be absolutely accurate. From the perspective of the function of the part, as long as the machining error is within the tolerance range required by the part drawing, it is considered that the machining accuracy is guaranteed.

Processing accuracy mainly includes:

Dimension accuracy: refers to the degree of consistency between the actual size of the part after machining and the center of the tolerance zone of the part size.

Shape accuracy: refers to the degree of conformity between the actual geometry of the surface of the processed part and the ideal geometry.

Position accuracy: Refers to the actual position accuracy difference between the relevant surfaces of the part after processing.

Interrelation: Generally, when designing machine parts and specifying the machining accuracy of the parts, care should be taken to control the shape error within the position tolerance, and the position error should be less than the dimensional tolerance. That is, precision parts or important surfaces of parts must have shape accuracy requirements higher than position accuracy requirements, and position accuracy requirements must be higher than dimensional accuracy requirements.

Adjustment method

1. Adjust the process system

Trial cutting adjustment: Trial cutting-measuring the size-adjusting the cutting amount of the tool-cutting by cutting-retry cutting, and so on until the required size is reached. This method has low production efficiency and is mainly used for single-piece small batch production, especially in Aluminum CNC Machining.

Adjustment method: obtain the required size by adjusting the relative positions of the machine tool, fixture, workpiece and tool in advance. This method has high productivity and is mainly used for mass production.