Datum transfer is usually carried out to satisfy requirements of fixture and operation in manufacturing process. Often such requirements are different than the functional requirements used when choosing tolerances during design. Reassignment and recalculation of tolerances are required to evaluate whether a machining scheme can reach the desired design specification. Since a planar feature are widely utilized in datum reference frame, this paper mainly focuses on the transfer of one datum plane to another parallel plane-segment with round or polygonal shape by using 3D Tolerance-Maps. Firstly, a parametric model about two parallel planar features is proposed to describe the geometric properties and spatial relationships between a design datum and a machining datum. Then, based on a variation analysis of plane-to-plane datum transfer, a more elaborate transformation is utilized to relate T-Maps (Patent No. 6963824) with M-Map. Next, several rigid mathematical inequalities are presented to describe the boundaries of primitive and transformed T-Maps for further accumulation and comparison. The largest possible machining tolerances are determined by fitting the M-Map inside the design T-Map. Analytical relations between the machining and design tolerances are extracted from cross-sections through both T-Maps. Lastly, an example is illustrated to show feasibility of the method.
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ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 4–7, 2013
Portland, Oregon, USA
Conference Sponsors:
- Design Engineering Division
- Computers and Information in Engineering Division
ISBN:
978-0-7918-5591-1
PROCEEDINGS PAPER
Using Tolerance-Maps to Transfer Datum Plane From Design Tolerancing to Machining Tolerancing
Ke Jiang,
Ke Jiang
Beijing Institute of Technology, Beijing, China
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Joseph K. Davidson,
Joseph K. Davidson
Arizona State University, Tempe, AZ
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Jami J. Shah,
Jami J. Shah
Arizona State University, Tempe, AZ
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Jianhua Liu
Jianhua Liu
Beijing Institute of Technology, Beijing, China
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Ke Jiang
Beijing Institute of Technology, Beijing, China
Joseph K. Davidson
Arizona State University, Tempe, AZ
Jami J. Shah
Arizona State University, Tempe, AZ
Jianhua Liu
Beijing Institute of Technology, Beijing, China
Paper No:
DETC2013-12722, V004T05A023; 10 pages
Published Online:
February 12, 2014
Citation
Jiang, K, Davidson, JK, Shah, JJ, & Liu, J. "Using Tolerance-Maps to Transfer Datum Plane From Design Tolerancing to Machining Tolerancing." Proceedings of the ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 4: 18th Design for Manufacturing and the Life Cycle Conference; 2013 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications. Portland, Oregon, USA. August 4–7, 2013. V004T05A023. ASME. https://doi.org/10.1115/DETC2013-12722
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