When marking the dimensional tolerance of the workpiece, it should be marked in one direction along the material entity direction.
Embedding principle means that the dimensional tolerance of the workpiece should be marked in one direction of the material entity direction.
These include:
The basic size of the hole is its minimum physical size, that is, its lower deviation is 0;
The basic size of the shaft is its maximum physical size, that is, its upper deviation is 0;
Symmetrical distribution of tolerance zone of length and size.
However, for the size that has not changed after wearing, the two-way deviation will generally be marked.
Chinese name
Principle of integration
field
Machinery manufacturing
Generally speaking, the TA representation of generalized concepts is applied.
Common concept
For the shaft, the smaller its size-so for the shaft, its size deviation is 0 and its lower deviation is negative-it is "into the body" (that is, into the material body), that is, its size is getting smaller and smaller;
For a hole, the larger its size-so for a hole, the lower deviation of its size is 0 and the upper deviation is positive-is "into the body" (that is, into the material body), that is, the size is getting bigger and bigger.
Generalized concept
The size of a hole is a broad concept, not a specific hole. Refers to the larger the size when processing parts. For example, when machining a groove on a part, the size of the groove will increase with the removal of metal, so the lower deviation of this size in the assembly dimension chain is 0, that is, the actual size of the groove must be greater than or equal to the basic size before it can "enter the body".
In the same way, the shaft size means that the smaller the machining on the part, the outer contour of the part belongs to the shaft size, and the deviation is 0, that is, the actual outer contour of the part is smaller than the outer contour determined by the basic size, so it can be considered as "into the body".
Application situation
1. In principle, the manufacturing deviation between the dimensional tolerance of workpiece and the dimension of die cutting edge should be marked as one-way tolerance according to the principle of "into the body".
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