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Machining must master, parts machining accuracy knowledge book
Release time: 2023-11-13
Machining accuracy is the actual size, shape, position of the surface of the machined part of the three geometric parameters and drawings required by the degree of conformity of the ideal geometric parameters. Ideal geometric parameters, in terms of size, is the average size; in terms of surface geometry, is the absolute circle, cylinder, plane, taper and straight line, etc.; in terms of the mutual position between the surface is the absolute parallel, perpendicular, coaxial, symmetrical, etc.. The actual geometric parameters of the part and the ideal geometric parameters of the deviation value is called machining error.
1, the concept of machining accuracy
Machining accuracy is mainly used in the production of products to the extent that the machining accuracy and machining error are the evaluation of the geometric parameters of the machined surface of the term. Machining accuracy is measured by the tolerance level, the smaller the level value, the higher the accuracy; machining error is expressed in numerical terms, the larger the value, the greater the error. A high machining accuracy means a low machining error and vice versa.
There are 20 tolerance grades from IT01, IT0, IT1, IT2, IT3 to IT18, of which IT01 means that the part has the highest machining accuracy, IT18 means that the part has the lowest machining accuracy, and generally IT7 and IT8 are the medium level of machining accuracy.
The actual parameters obtained by any processing method will not be absolutely accurate, from the function of the part, as long as the machining error within the tolerance range of the requirements of the part drawing, it is considered to ensure the machining accuracy.
The quality of the machine depends on the machining quality of the parts and the assembly quality of the machine. The machining quality of the parts contains two major parts, the machining accuracy of the parts and the surface quality.
Machining accuracy refers to the degree to which the actual geometric parameters (size, shape and position) of a machined part conform to the ideal geometric parameters. The difference between them is called machining error. The size of the machining error reflects the level of machining accuracy. The larger the error, the lower the machining accuracy, the smaller the error, the higher the machining accuracy.
*** Translated with www.DeepL.com/Translator (free version) ***
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