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FACTORS AFFECTING THE PROCESSING QUALITY OF AUTOMATIC TERMINAL MACHINES

Views:5469     Author:Site Editor     Publish Time: 2020-06-23      Origin:Site

FACTORS AFFECTING THE PROCESSING QUALITY OF AUTOMATIC TERMINAL MACHINES

The quality of the products produced by the automatic terminal machine is affected by itself. The processing quality of its components and processes will affect the quality of the product. It mainly includes machining accuracy and surface quality.

 

 

Machining Accuracy

Terminal machining accuracy refers to the degree to which the actual values of parameters such as size, shape, and mutual position of the parts are close to their ideal values after the part is processed. The closer the actual value is to the ideal number, that is, the smaller the machining error, the higher the machining accuracy. The machining accuracy of parts includes dimensional accuracy, shape accuracy and position accuracy.

 

1.Dimensional Accuracy

It refers to the degree to which the actual size of the part is close to the ideal size, which is often expressed by dimensional tolerances. According to national standards, standard tolerances are divided into 20 levels. IT indicates standard tolerance, and Arabic numerals indicate tolerance levels. The larger the number, the larger the tolerance value, and the lower the dimensional accuracy. IT01 --- IT13 is used for fitting size. The currently used fitting size tolerance is below IT5. IT14-ITI8 is used for non-fitting size.

 

2. Shape Accuracy

It refers to how close the actual shape of the part is to the ideal shape. Shape tolerances include six types composed of straightness, flatness, return, reading column, line contour, and surface contour.

 

3.Position Accuracy

It refers to the degree to which the actual potential wall between the surface, axis, or plane of symmetry of the part is close to the ideal potential wall. The terminal machine position tolerance includes eight kinds of parallelism, perpendicularity, inclination, position, coaxiality, symmetry, mouth beating and full beating..

 

Generally, the accuracy achieved by the machining method refers to the accuracy that can be achieved under normal operating conditions, which is also called economic accuracy. When designing a part, first of all, it is necessary to decide which level of accuracy is selected according to the importance of the size of the part, and secondly, the equipment conditions and processing costs of the factory should be considered. In short, the principle of selecting accuracy is to select a lower accuracy on the premise that it can meet the technical requirements.

 

 

Surface Quality

The surface quality of the part includes the surface roughness, the degree of hardening of the surface layer and the nature and size of the surface residual stress. The surface quality of the part has great influence on abrasion resistance, corrosion resistance, fatigue resistance and other properties, as well as the service life of the part. Therefore, the surface texture requirements of parts working under high speed and heavy load are high. Generally, only the surface roughness requirements are marked on the drawings of general parts. The surface roughness is usually evaluated by the arithmetic mean deviation of the contour. The higher the surface quality of the part, the smaller the surface roughness value. However, the surface of some parts needs to be bright for the sake of appearance or clearance, but the accuracy is not necessarily high, such as the handles and panels of machine tools.

 

 

Hopefully, after reading this passage, you can learn about more information about the automatic terminal machine. And if you are interested, please click http://www.cnkefa.com/.


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