Shape and position tolerance of computer gong machining

1、 Interchangeability of parts

Precision parts manufacturers introduced that after long-term production and operation of the machine, some parts are bound to wear, deformation and scrap, replaced with new parts. These parts are called accessories or spare parts. Accessories or spare parts without repair or selection, installed on the machine can run, known as interchangeability.

In order to achieve interchangeability, the size and geometry of parts should be consistent when manufacturing parts. The so-called consistency does not mean that the score is exactly the same (this is neither economical nor possible). As long as the size and geometric shape of the parts are controlled within an allowable range, it is necessary to make the parts and other parts have the same binding performance. The allowable error range is the geometric tolerance.

2、 The machining quality of precision parts is expressed by machining precision

1. Geometric accuracy

Geometric accuracy refers to the accuracy of geometric shape of each surface or axis, such as whether the line is straight, whether the surface is flat, whether the normal section on the cylinder is circular, etc. The allowable variation range is represented by “geometric tolerance”. The smaller the geometric tolerance number is, the higher the shape accuracy is.

2. Dimensional accuracy

According to the analysis of precision parts processing manufacturers, the dimensional accuracy refers to the accuracy of the size of the parts after processing, which is represented by “dimensional tolerance”. When the dimensions of parts are the same, the higher the accuracy, the smaller the tolerance number.

3. Position accuracy

According to the introduction of precision parts processing manufacturer, position accuracy refers to the accuracy of mutual position between the surfaces of parts, such as whether the two planes are parallel, whether they are vertical, whether the two axes are coaxial, and so on, which is represented by “position tolerance”.

The tolerance of the above shape and position is referred to as “form and position tolerance”.