Abstract
The objective of this paper is to explore the evaluation method of manufacturing process to verify its effectiveness based on the limitation of the variations which occur in multi-station machining processes. Firstly, the manufacturing process of a mechanical part is considered as a mechanism mainly consisted of machine-tool, part-holders, machined part, and cutting tools; And small displacement torsors (SDTs) are applied to describe all deviations in the manufacturing process, including the variation deviations of the machined surfaces of a part with regards to their nominal positions, the gap deviations associated to each joint between two contact surfaces, etc; Then, the 3D manufacturing variation model is established based on the relations between the machining feature variations and the functional tolerance requirements to realize the evaluation of manufacturing process. Finally, an application example is given to illustrate the proposed method.
Highlights
Multi-station machining process is the most common, most important and most difficult to control in the manufacturing industry
This paper focuses on 3D modeling of the geometrical variations in the processes of part machining and exploring the evaluation of manufacturing process by using the small displacement torsors (SDTs) and its transfer formula
In order to verify the effectiveness of the manufacturing process, we will discuss the manufacturing process evaluation method that takes into account the limitations on the manufacturing variations by the tolerances related to the functional requirements
Summary
Multi-station machining process is the most common, most important and most difficult to control in the manufacturing industry. The research on evaluation method of manufacturing process based on 3D manufacturing variation model for multi-station machining processes plays an important role in estimating the geometrical and dimensional quality of manufactured parts, optimizing the process route of products, generating robust process plans, and eliminating downstream manufacturing problems. Laifa et al [6] presented a 3D formalization of manufacturing tolerancing which associates the concept of SDTs, the functional constraints, and manufacturing process capability. This approach enables the evaluation of manufacturing process by limiting the variations which occur at the various production setups. This paper focuses on 3D modeling of the geometrical variations in the processes of part machining and exploring the evaluation of manufacturing process by using the SDT and its transfer formula
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