Accuracy is an important indicator for measuring the performance and quality of a product. Therefore, when designing a product, the accuracy of the product should be analyzed and calculated to specify the accuracy of each component that makes up the product.
Accuracy, also known as accuracy, refers to the closeness of the actual parameter value (size, geometry, etc.) to the nominal value; the error is the difference between the actual parameter value and the nominal value. The smaller the error, the higher the accuracy, the higher the cost.
There are three main reasons for the error:
Design error
Design error, also known as principle error, is mainly generated in the design process, such as using an approximate mechanism instead of an ideal mechanism in the design of the scheme, or adopting an approximate assumption, which makes the design have errors in principle from the beginning.
The design error is a systematic error and should be algebraic and additive when calculating the total error.
2. Manufacturing error
Manufacturing error, also known as process error, is mainly caused by errors in the manufacturing process of parts, such as differences in the material properties of parts, inaccuracies in the size and shape of parts, and inaccuracies in manufacturing and installation.
The manufacturing error is a random error. When calculating the total error, it is often assumed that the error is normally distributed, so it can be added by geometry.
3. Usage error
Use errors are generated during the use of the part. Such as the wear of the mating surface of the part, the deformation under the load, the change of the ambient temperature, the change of the size of the part and the error caused by vibration, friction and the like.
The use error is also a random error, which is the same as the manufacturing error in the calculation method.
The above three types of errors are mutually constrained, and the above three types of errors should be correctly handled to improve the accuracy of the parts.
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