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Home xin What are the mechanical design values? Is the allowable deviation the content of the design value? thank you.

What are the mechanical design values? Is the allowable deviation the content of the design value? thank you.

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1. About tolerance zone:
(1) tolerance zone is determined by both basic deviation and tolerance
(2) basic deviation: the deviation closer to the zero line (basic dimension) in the upper and lower deviations. When the upper and lower deviation is as close to the zero line, both can be used as the basic deviation, and only JS or JS is used for the relative hole and shaft
(3) tolerance: refers to the difference between the upper deviation and the lower deviation, or the difference between the maximum dimension and the minimum dimension, that is, t = |es-ei|
for example, if the design diameter is 100mm, the deviation is + 1 and – 0.5, which means that the maximum value is 101mm and the minimum value is 99.5mm, which are qualified within this range. This + 1, – 0.5 is the tolerance zone. Where – 0.5 is close to the basic dimension, which is the basic deviation, and the tolerance t = 1 – (- 0.5) = 1.5, so this tolerance zone is determined
this example is given casually, so you can’t find the corresponding tolerance zone code (basic deviation code and standard tolerance grade) in the national standard. Change your example as follows:
if the design diameter is 100mm and the deviation is + 1.391, – 0.009, the tolerance zone code can be determined as G15 (that is, the basic deviation code is g, the value is -0.009; the tolerance grade value is IT15, t = 1.4)
2. About fitting:
(1) interference fit: the fit in which the interference between the hole and the shaft is greater than or equal to zero. At this time, the size of the hole is less than the size of the shaft, that is, “the tolerance zone of the hole must be below the tolerance zone of the shaft”
(2) clearance fit: a fit in which the clearance between the hole and the shaft is greater than or equal to zero. At this time, the size of the hole is greater than the size of the shaft, that is, “the tolerance zone of the hole must be above the tolerance zone of the shaft”
(3) transition fit: the fit between the hole and the shaft may be in the state of clearance or interference. At this time, the dimensions of the hole and the shaft are basically the same, that is, “the tolerance zones of the hole and the shaft overlap each other”.

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