Is the quality of precision parts represented by the machining accuracy

The quality of precision parts machining is represented by the machining accuracy:

1、 Interchangeability of precision machined parts

After long-term production and operation, precision parts processing machines will inevitably wear out, deform, and scrap certain parts, and replace them with new ones. These parts are called accessories or spare parts. Accessories or spare parts that can operate on a machine without repair or selection are called interchangeable.

In order to achieve interchangeability, when manufacturing parts, it is necessary to make the dimensions, geometric shapes, etc. of the parts consistent. The so-called consistency does not mean that the score is exactly the same (which is neither economical nor possible). As long as the size and geometric shape of the parts are controlled within an allowable range, so that the parts have the same bonding performance when combined with other parts. This allowed error range is also known as the geometric tolerance.

2、 The machining quality of precision parts is represented by machining accuracy

1. Geometric shape accuracy

Geometric shape accuracy refers to the accuracy of the geometric shapes of the surfaces or axes that make up the parts, such as whether the lines are straight, whether the surfaces are flat, and whether the normal sections on the cylinder are circular. The allowable range of variation is represented by "geometric tolerance", and the smaller the geometric tolerance number, the higher the shape accuracy.

2. Dimensional accuracy
Dimensional accuracy refers to the degree of accuracy of the dimensions of a part after processing, expressed as "dimensional tolerance". When the dimensions of the parts are the same, the higher the accuracy, the smaller the tolerance number.

3. Position accuracy
Position accuracy refers to the accuracy of the mutual positions between the surfaces that make up the part, such as whether the two planes are parallel, perpendicular, and whether the two axes are coaxial, expressed as "position tolerance".
The tolerance of the above shape and position is referred to as "geometric tolerance".