Geometric Tolerance Items***There are 19 items, which are categorized into four major categories: shape tolerance, directional tolerance, positional tolerance and runout tolerance.
1, shape tolerance: including straightness, flatness, roundness, cylindricity, line contour and face contour. These tolerances are used to characterize the shape of the part to ensure that it meets the design requirements.
2, direction tolerance: including parallelism, perpendicularity and inclination. These tolerances are used to characterize the orientation of the part relative to the datum axis to ensure that it is consistent with the design requirements.
3, positional tolerances: including coaxiality, symmetry and positional degree. These tolerances are used to characterize the position of the part relative to the datum to ensure that it is consistent with the design requirements.
4, runout tolerance: including circular runout and full runout. These tolerances are used to characterize the amount of runout of a part during rotation to ensure that it conforms to design requirements.
Geometric Tolerance Application Scenarios:
1, Mechanical Manufacturing: In mechanical manufacturing, geometric tolerances are used to determine the allowable range of deviation in the size and shape of a part. Through the use of geometric tolerances, parts can be assembled to ensure good interchangeability and reliability. For example, in machine tool manufacturing, geometric tolerances are used to control the parallelism, perpendicularity, roundness, etc. of parts.
2, engineering design: in engineering design, geometric tolerances are used to determine the clearance and fit between assembled parts. Through the use of geometric tolerances, it is possible to ensure that the clearance between assembled parts is not too large or too small in order to avoid assembly difficulties or looseness. For example, in automobile engine design, geometric tolerances are used to control the clearance between the piston and the cylinder liner to ensure stability and sealing of the piston's movement within the cylinder.
3, assembly process: in the assembly process, geometric tolerances are used to determine the sequence and method of the assembly process. Through the use of geometric tolerances, it can be ensured that all aspects of the assembly process can be carried out smoothly. For example, in spacecraft assembly, geometric tolerances are used to determine the sequence and method of assembly of individual components to ensure the structural and functional integrity and reliability of the spacecraft.
4, electronic equipment manufacturing: in electronic equipment manufacturing, geometric tolerances are used to control the location and spacing of components on circuit boards to ensure the reliability and stability of electronic equipment.
5, medical device manufacturing: in medical device manufacturing, geometric tolerances are used to control the size, shape and position of medical devices to ensure the safety and effectiveness of medical devices.
6, aerospace field: in the aerospace field, geometric tolerances are used to control the size and shape of aircraft and spacecraft components to ensure the performance and safety of aircraft and spacecraft.