A rule-based exclusion method for tolerance specification of revolving components

Zhao, Qijian; Li, Tukun; Cao, Yanlong; Yang, Jiangxin; Jiang, Xiangqian

doi:10.1177/0954405419871137

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…Optimization of these tolerance types relies heavily on the design experience of the designer. In order to overcome the subjectivity and experience of designers and improve the scientific of decision making, Zhao et al [36] proposed an optimal tolerance method based on the independent principle and entropy theory for rotating shaft parts. However, this method needs to form an independent principle according to certain rules and select a weight factor.…”

Section: Related Workmentioning

confidence: 99%

“…The variation of geometric features of a part within the tolerance domain can be expressed as a combination of three translational and three rotational DOFs in a Cartesian coordinate system [20,36]. Then the DOF vector of the tolerance band is denoted as V, as shown in Equation (1).…”

Section: Definition and Representation Of Dof Of Tolerance Zonesmentioning

confidence: 99%

“…From the definition of the DOF of the tolerance zone, it can be seen that the DOF of the tolerance zone affects the direction of changes in assembly feature surfaces, and subsequently affects the changes in target components in the assembly. The variation of geometric features of a part within the tolerance domain can be expressed as a combination of three translational and three rotational DOFs in a Cartesian coordinate system [20,36]. Then the DOF vector of the tolerance band is denoted as V, as shown in Equation (1).…”

Section: Definition and Representation Of Dof Of Tolerance Zonesmentioning

confidence: 99%

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Optimization Method of Assembly Tolerance Types Based on Degree of Freedom

Liu,

Huang,

Chen

2023

Applied Sciences

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The automatic generation of tolerance specifications is an important aspect of achieving digital product design. An obvious feature of the current automatic generation of tolerance based on rule reasoning is that all tolerance types will be inferred for the same assembly feature. However, when labelling part tolerance information, designers need to further screen based on the geometric function of the assembly, which may result in prioritizing tolerance types that do not meet the geometric requirements of the assembly. This paper presents an assembly tolerance type optimization method based on the degree of freedom (DOF) of tolerance zone for the optimization and screening problem after reasoning all possible tolerance types. Firstly, we define the DOF of tolerance zones and their representations, while also define the control parameter degrees of freedom (CPDF) of assemblies, and analyze the CPDF of typical geometric functional tolerances of assemblies; Secondly, the Boolean operation relationship between sets is used to construct a Boolean operation preference method for the CPDF. Then, an algorithm for the optimal selection of the shape and position tolerance items of the assembly is established based on the DOFs of tolerance zone. Finally, the proposed method is verified by an engineering example, and the result shows that the method can optimize and screen the geometric tolerance types of assemblies.

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Section: Related Workmentioning

confidence: 99%

Section: Definition and Representation Of Dof Of Tolerance Zonesmentioning

confidence: 99%

Section: Definition and Representation Of Dof Of Tolerance Zonesmentioning

confidence: 99%

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Optimization Method of Assembly Tolerance Types Based on Degree of Freedom

Liu,

Huang,

Chen

2023

Applied Sciences

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Optimal Repair Time Limit and Replacement Age for a System with Multiple Types of Failures

Qiao

Luo

2023

Mechanisms and Machine Science

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Estimating the cost of functional requirements for tolerance allocation on mechanical assemblies

Armillotta

2023

Int J Adv Manuf Technol

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When allocating tolerances to geometric features of machine parts, a target variation must be specified for some functional requirements on the assembly. Such decision, however, is usually made from experience without consideration of its effect on manufacturing cost. To allow such an assessment, the paper describes a method for estimating the cost of a requirement as a function of its variation. The estimation can be done before solving a tolerance allocation problem, at the time the variation on the requirement is chosen as an optimization constraint. A simple expression for the cost of requirements of various types is obtained using the extended reciprocal-power function for the cost of part tolerances, and the optimal scaling method for tolerance allocation. As a result, the costs of both requirement variations and part tolerances can be treated in the same way; this allows a hierarchical approach to tolerance allocation, which can simplify the problem when dealing with complex dimension chains. Furthermore, simple calculations based on the proposed method suggest general cost reduction criteria in the design of assemblies.

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A rule-based exclusion method for tolerance specification of revolving components

Cited by 8 publications

References 40 publications

Optimization Method of Assembly Tolerance Types Based on Degree of Freedom

Optimization Method of Assembly Tolerance Types Based on Degree of Freedom

Optimal Repair Time Limit and Replacement Age for a System with Multiple Types of Failures

Estimating the cost of functional requirements for tolerance allocation on mechanical assemblies

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