Introduction General part

2.1 Technologicality of detail structure.
In mechanical engineering, the main role in the mechanical processing of parts is played by their technological and quantitative characteristics. This means that the structural dimensions of the part and the technical requirements for them should be studied and taken into account when machining surfaces. It turned out that the part was obtained by casting the workpiece in accordance with the design and technical requirements. According to the design and technical requirements of the part, it was found that it was obtained by casting the workpiece of the part. Therefore, its surface cleanliness is 3.2 μm, the surface of TTV holes is 3.2 μm, the remaining surfaces are AVBE surfaces with an accuracy of 6.3 μm, and the O surface does not require mechanical processing. Ensure that the surfaces of the torus are perpendicular to the central axis BAV and O. Angle radii on unspecified surfaces are 1.5 mm. Determine the technological parameters. We calculate the accuracy of the measurement by the following formula:
T=

Here are the dimensions of T -quality

n is the number of dimensions
For our case, size 5 is in quality 7
5 sizes in 9th grade
1 size in 12 quality
5 sizes in 14th quality
Putting these values ​​in a formula:
T= = =11.37 quality
So our detail is 11.37 dimension quality.
We determine the accuracy coefficient using the following formula:
K =1- =1- =0.91
We will continue to calculate the cleanliness of the surface
_SH =
here: SH - accuracy of surface cleanliness;
n - number of surfaces;
For our case
7 surfaces 3.2 μm;
2 surfaces from 6.3 μm;
4 surfaces from 12.5;
1 surface from Rz 80;
In this case, the accuracy of the details on the surface cleanliness:
SH = mkm.
In this case, the coefficient of surface cleanliness:
K= =
It can be seen from these calculations that our detail is Rz 11.78 μm in terms of surface roughness with a dimensional accuracy of quality 11.