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Method for verifying three-dimensional tolerance marking correctness

A verification method and correctness technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the relationship between the number of tolerance types and the corresponding benchmarks, and achieve automatic correctness verification and support for tolerances The effect of inspection and measurement

Active Publication Date: 2013-09-25
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0003] Chinese Patent No. 201010520184.6 (Authorized Notice No. CN101982821B) discloses a complex assembly assembly tolerance specification and its tolerance zone type reasoning method. The patented technical solution proposes to determine the type of tolerance for the geometric elements of the part, but it does not explain the tolerance type and datum The relationship between the number of tolerance types allowed by a geometric element and the relationship between the corresponding datum

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  • Method for verifying three-dimensional tolerance marking correctness
  • Method for verifying three-dimensional tolerance marking correctness
  • Method for verifying three-dimensional tolerance marking correctness

Examples

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Embodiment 1

[0061] Example 1 is based on Figure 4a , 4b and Figure 5a , 5b The model in is implemented as an example. Figure 4a , 4b and Figure 5a , 5b The part models are the same, the difference is the geometric tolerance annotation, where, Figure 4a , 4b Dimension for the correct geometric tolerance, Figure 5a , 5b The datum order in the geometric tolerance frame of object C and object D is artificially changed in order to check whether the method of the present invention can detect this erroneous modification. It should be noted that the method described in the present invention is a general method applicable to other mechanical products and components.

[0062] image 3 It is the tolerance verification flow chart of the present invention. First, establish a three-dimensional solid model in three-dimensional software and mark it with three-dimensional tolerances, and then use the method of the present invention to carry out secondary development of the software to obt...

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Abstract

The invention discloses a method for verifying three-dimensional tolerance marking correctness. The method includes the steps: (1) building a three-dimensional solid model; (2) marking three-dimensional tolerances; (3) acquiring geometric elements marked with geometric tolerance information in the three-dimensional solid model; (4) building intrinsic directions of target elements; (5) determining natural degrees of freedom of target geometric elements; (6) acquiring the degree of freedom constraint level of datum elements for the target elements; (7) calculating the degree of freedom constraint capacity of a datum system; (8) checking the three-dimensional tolerance marking correctness. The tolerance marking correctness is checked by establishing relationships of various tolerance types and the degrees of freedom according to expression of the degrees of freedom of the geometric elements and a method for calculating the degrees of freedom constrained among the geometric elements, a three-dimensional tolerance domain is further quantitatively described by the aid of the concept of the degrees of freedom, the tolerances are more effectively inspected and measured, and the tolerance marking correctness is automatically verified.

Description

technical field [0001] The invention belongs to the technical field of computer-aided tolerance design (CAT), and in particular relates to a method for verifying the correctness of dimension and geometric tolerance labeling based on the analysis of degrees of freedom of geometric elements and the principle of geometric quantity measurement in mechanical product design models. Background technique [0002] Tolerance marking is a main form of expression for product geometric accuracy requirements. Compared with traditional two-dimensional drawings, three-dimensional tolerance marking can make the model and tolerance requirements more clearly and concretely expressed, making the subsequent processing and manufacturing process smoother, thereby improving design and manufacturing. efficiency and reduce product development costs. However, due to the complexity of the types and relationships of tolerance types and geometric elements, the content of tolerance specifications is compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 吴玉光顾齐齐
Owner HANGZHOU DIANZI UNIV
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