Classification and detection of flatness of cast iron flat platform

According to the types of cast iron plates, there are different technical requirements for gray iron castings, malleable iron parts, and ductile iron. Generally, gray iron castings shall be executed in accordance with GB976-67. The pig iron used for ductile iron shall be selected according to GB1412-78. The standard categorizes pig iron into several groups, classes, and grades based on its chemical composition, without considering its carbon content. The inspection can be carried out according to GB1348-88. The shape, size, and quality deviation should comply with the drawing specifications or the provisions of GB6414-1999. The grade, machining allowance, and dimensional deviation of the tablet should comply with the drawing specifications or the provisions of GB6414-1999.

Firstly, enclose the actual surface with two parallel ideal planes and minimize the distance between the two ideal planes, which is the flatness error value. Secondly, an ideal plane is used to be tangent to the actual surface, and the maximum distance between the ideal plane and the actual surface is minimized, which is the flatness value. Again, place an ideal plane in the middle of the actual surface according to its orientation, and minimize the sum of squared distances between each point on the actual surface and the ideal plane; Finally, the flatness error value of the tested surface is determined by the difference between the maximum and minimum deviations of each measuring point from a plane parallel to one diagonal of the tested surface as the evaluation base.

In addition, there is a method for detecting the surface roughness of cast iron platforms, which is to use instruments. The light cutting microscope measures the micro roughness of the machined surface of a component using the light cutting method. The maximum surface roughness can be determined to be 0.2, and the depth of surface scratches, lines, or certain defects can also be measured. The characteristic of the light cutting method is that it is carried out without damaging the surface. It is an indirect measurement method. The unevenness of the texture can only be determined through calculation.